Tagi -
1. Optimized shock-absorption design for the main unit, reduce vibration when the Raymond mill running.
2, Optimized design for the main unit structure, improve overall strength and rigidity.
3. Innovative design of the”maintenance-free device” for grinding roller assembly, Refill grease every 30 days.
4, Optimize inside design of main unit keep the roller and grinding ring abutting contact during running, improve grinding efficiency and operational reliability and reduce the high failure rate of vertical pendulum grinding mill.
5. Equipped with water cooling structure for reducer of main unit. Reducer adopts German technology.
6. Automatic control for air blower valve, reduce operating labor intensity.
7. Integral installation for air blower; water cooling system ensures running Efficiency.
8. Running more smoothly, High capacity, low noise, energy saving.
9. Intelligent control. The one button start and stop system and fault alarm system reduce operating personnel.
Do not use the retaining plate of the broken hammer as a tool to push the weight. Because the excavating loader is mainly a small machine, its own weight is light, if it pushes the weight, it will damage the granite crushing produciton line, which will cause the main engine lifting arm to break seriously, and even cause the main engine turning over accident.
Operate when the hydraulic cylinder is fully extended or fully shrunk; otherwise, the impact vibration will be transmitted to the hydraulic cylinder body and then to the main engine.
In the process of hoisting the jaw crusher's main engine, rollover occurs, which makes the eccentric shaft bend under unilateral force. In serious cases, it is necessary to replace the main engine immediately and strive for new hoisting replacement.
2. Material hardness exceeding standard
If the material given is too hard, it will cause eccentric shaft bending if it exceeds the maximum range of jaw crusher. Therefore, material hardness should be controlled and suitable crusher should be selected according to the compressive strength of crushed material.
3. Elbows do not meet the standard
When this kind of situation occurs, it should be checked in many ways. It is strictly forbidden to use elbow plate and elbow pad which do not meet the design standards.
4. Improper heat treatment of eccentric shaft
When the heat of eccentric shaft does not disperse in time, it will easily lead to short-term fracture; the appropriate method at this time is to replace the new eccentric shaft and use the eccentric shaft qualified for heat treatment.
5. Long-term overload operation of main engine
It is necessary to shut down the machine in time for maintenance, adjust the working load or replace the suitable crusher.
As we have mention that our ZENITH is raymond mill manufacturer, so if you are meeting some problems when you using the powder grinding mills, you can feedback for our customers service staff, and we will arrange after sale for you as soon as possible. So if you want to cooperate with a trustworthy raymond mill manufacturer, ZENITH will be the better choice.
As we have mention that our ZENITH is raymond mill manufacturer, so if you are meeting some problems when you using the powder grinding mills, you can feedback for our customers service staff, and we will arrange after sale for you as soon as possible. So if you want to cooperate with a trustworthy raymond mill manufacturer, ZENITH will be the better choice.
It is reported that the Raymond mill produced by Zenith Mining Machinery was developed on the basis of raymond mill to further simplify the crushing process for basic industrial raw materials such as limestone, gypsum and raw coal. Compared with the ordinary single-stage raymond mill, the product size is smaller (80%<5mm), and the equipment investment is lower than 35-50% of the traditional process equipment of the same scale.
Its long-term operation and management cost is less than about 30% of the traditional process equipment system of the same scale. It has the remarkable characteristics of large feed size, small feed size, long hammer life, large production capacity, low power consumption, simple maintenance and low operating costs. It has been widely used in cement, sand and gravel, power and other industries.
Vertical Roller Mill: https://www.hotverticalmill.com/
Barite Raymond mill is a systematic structure, the whole system is independent including material crushing, conveying, milling to the finished product collection, storage, and packaging, fineness can be adjusted between 80-600 mesh, the capacity of new updated barite Raymond grinding mill capacity is 40% higher compared with the traditional mill, the unit electricity cost saves more than 30%, is a new type of high efficient energy saving and environmental protection equipment.
Optimized power transmission scheme for high efficiency and low power consumption; Cummins diesel engine with optional Tier3 environmental protection standard and optional self-unloading iron remover;
The equipment has a built-in noise muffler, the best noise absorption system, compact and flexible equipment, more able to meet the construction waste crushing operation between urban areas, an effective dust removal system, suitable diesel engine noise discharge status, and the release system can remotely control the hydraulic elimination of the stone crusher machine.
{Application scope }: widely used in metallurgy, chemical, rubber, plastics, coatings, paints, inks, building materials, medicine and food processing field of the milling machine, with grinding effect, high technical level in domestic, ideal processing equipment for non-metallic minerals.
{Application materials }: for bauxite, titanium dioxide, titanium ore, phosphate, clay, graphite, calcium carbonate, barite, calcite, gypsum, dolomite, feldspar and other non-metallic mineral products processing for high capacity and high efficiency, simple operation, convenient adjustment of fineness.
Phase two: grinding limestone material will be sent to the storage hopper by the elevator, and than the feeder will send the material to the vertical roller mill for grinding.
Phase three: classifying ground material will be classified, coarse powder will fall back to the main mill to be ground again.
Phase four: production collecting qualified powder will flow with the air and be collected in the collector, then the finished powder will be transported to the product storage bin through discharge port. Lastly, the powder will be loaded by tank car or packed by packing machine.
https://m.qualitygrinder.com/grinding-mill/vertical-roller-mill.html
Ultrafine mill can adjust the fineness of finished products arbitrarily between 80 and 400 meshes, equipped with pulse dust collector, can achieve 99% efficiency of dust collection, and all positive pressure parts of the main engine have been sealed to achieve dust-free processing workshop, not only that, the mill maintenance is also convenient, the use of sealed structure design, replacement of the ring does not need to dismantle the roller device, so. The whole machine is easier to maintain and more efficient.
After many investigations and visits in the market, the customer was very satisfied with ZENITH's solid product quality and perfect after-sales service, and signed a win-win cooperation agreement to supply the situation. This article will tell you about the technological characteristics and milling price of the 200 mesh bauxite powder ultrafine mill.
1. ZENITH mine: always to think of customers.
As a professional grinding equipment manufacturer,ZENITH has always set up offices and service centers in all parts of the country in order to help more powder customers operate normally and solve their worries. The mode of service and efficiency, provide equipment support and follow-up guarantee for every enterprise.
Ultrafine mill manufacturing enterprises, always based on the market, customer-centric to create high-quality ultrafine mill offer for mica milling customers to enhance market competitiveness.
There are over 30 mining and utilization areas of China's mica mine. The main producing areas are: Altay muscovite in Xinjiang, Sichuan Danba muscovite, Inner Mongolia Tuuweula mica, Shaanxi Danfeng muscovite, Jilin Ji'an mica Mine, Pingzhen mica mine in Henan Province and Quyang muscovite and so on.
In recent years, the field of comprehensive utilization of mica in foreign countries continues to expand, and has achieved good application in the fields of building materials, earthquake-proofing, lubricating, organic and inorganic composite materials and sealing materials.
After many investigations and visits in the market, the customer was very satisfied with ZENITH's solid product quality and perfect after-sales service, and signed a win-win cooperation agreement to supply the situation. This article will tell you about the technological characteristics and milling price of the 200 mesh bauxite powder Raymond mill.
As a professional grinding equipment manufacturer,ZENITH has always set up offices and service centers in all parts of the country in order to help more powder customers operate normally and solve their worries. The mode of service and efficiency, provide equipment support and follow-up guarantee for every enterprise.
In metallurgy, chemical industry, building materials, industrial solid waste, thermal power plant and other fields, ZENITH series grinding mill has shown great advantages and characteristics, not only large capacity, low energy consumption, but also energy saving and environmental protection, is an ideal powder production line for different powder customers, creating greater profits and value.
Barite mill is high-output, high-efficiency, energy-saving and environmentally friendly, product fineness is easy to adjust, simple equipment process, small floor space, easy maintenance, low operating cost, and low consumption of wear-resistant materials. SBM is technologically innovative and serves the society.
For the mission, on the road of development, we will continue to improve the innovation system of product innovation, technology innovation, service innovation and management innovation, and we are determined to create value for our customers.
Performance advantages: The ultrafine vertical mill is replacement equipment of the traditional ultrafine vertical milling machine. Wide usage, simple operation, easy maintenance, stable performance, high cost-effective, 30% -40% higher output than the traditional Raymond Mill, is a kind of economical and practical ultrafine vertical milling equipment.
Applicable materials: Focus on grinding and processing of diabase, clay, graphite, clay, coal gangue, wollastonite, lime, zircon sand, bentonite, manganese ore, gypsum, calcite and other Mohs hardness below 7 non-metallic mineral ores. The equipment has a number of national patent technologies; performance reached the national leading level.
In recent years, application of slag powder in the construction is gradually widely recognized, slag powder production enterprises will also increase. SBM professionally supply ultrafine mill, taking green products, the harmonious development and improve efficiency, as the company's purpose, to provide customers with satisfactory service.
China: China is rich in mica resources, nearly all over the country; the total output is about 3 million tons, accounting for about 10% of the world’s total output. The main types are muscovite and phlogopite, which have been exploited and used more than 30 mines. The main producing areas are Xinjiang Altai muscovite ore, Sichuan Danba muscovite ore deposit, Inner Mongolia Guiguula muscovite mine, Shaanxi Danfeng Muscovite ore, Jilin Jimei gold mica mine, Henan Zhenping gold mica ore and Hebei Quyang muscovite mine and so on.
The equipment covered a number of patented technologies, is effectively promote the efficient operation of equipment and technical support and protection, can greatly enhance the overall production efficiency, effectively improve the single unit of equipment production, reduce the overall investment costs ideal processing equipment.
The mill is based on technological innovation of traditional horizontal grinding mill, energy consumption and energy consumption per unit are greatly improve the user's equipment performance, has a wide range of applications in the field of non-metallic mineral processing.
The main purpose of nano-calcium carbonate
1. the plastics industry
2. the coating industry
3. the paper industry
4. rubber industry
5. the ink industry
6. other aspects
Calcium carbonate can also be used in health care products, feed, cosmetic (cosmetics, soap, facial cleanser, and toothpaste), ceramics and other industries.
It produces many types of environmental protection grinding mills, including Raymond mill, vertical mill, ultra-fine grinding mill, ultra-fine vertical grinding mill and other equipment. Zenith project team can provide matching grinding mill equipment according to customer needs.
The application of environmental protection Raymond mill equipment can produce 80-600 mesh of talc powder, which helps to achieve high efficiency production and processing.
The most important kind is the ultrafine vertical mill. Ultrafine vertical mill is currently the most widely used desulfurization technology, and its principle is to crush blocks of limestone into powder by using ultrafine vertical mill, and then limestone powder is made into slurry as the desulfurization absorber to mix with gas which enters the absorption tower.
Sulfur dioxide in the flue gas and calcium carbonate in the slurry and the incoming air reacts to form gypsum. The sulfur dioxide in flue gas is expelled out, avoiding environmental pollution caused by the large number of emission.
According to statistics, using vertical roller mill to grind the ore is still the main means processing the metal mineral and non-metallic into superfine powder.
Although it is possible to prepare the ultrafine powder by chemical synthesis, but the cost is too high, so it failed for the industrial production.
With a little knowledge, skill, and creativity, a prospector can build a custom vertical roller mill from almost any type of solid material available.To begin with, the miner/manufacturer must see how vertical roller mill function.
The containers impersonate a stream bed, enabling water and sediment to wash over it and store denser protests along the parts of the stream where the water moves all the more gradually. You can imagine a current and flow of water or air moving over a surface.
The current back off when it is compelled to move around or over a question and this is the place the thick particles settle out of the current. For instance, when sand or snow is taken away from the ground by wind, the air current backs off when it experiences a fence.The heavier particles are stored, leaving a trail on the contrary side of the fence; while the lighter ones stay in the current.
When they say that there is a flood of materials like Black Pyrrhotite, White Quartz, silver and gold on the grooves, at that point this is something worth being thankful for.At the point when materials are washed with the clean water, they should drop into 3 containers underneath the raymond mill.
There is an inside wash that will assemble the purest parts of gold while the two outside washes will accumulate some gold, however not to such an extent as that pure.
Washing operations are often accompanied by screening, such as washing directly on the vibrating screen or sending the ore obtained by the washing machine to the vibrating screen. Screening can be used as an independent operation to separate products of different granularity and grade for different purposes.
The technological process of dealing with aggregate oxide ore is generally crushing the ore to 6 ~ 0 mm or 10 ~ 0 mm, then classification, jigging at the coarse level and shaking at the fine level. The gravity separation equipment is mostly Haz reciprocating mineral jig and 6-S type shaking table.
Separation of weak magnetic minerals, such as hematite, limonite, siderite, ilmenite, chromite, wolframite, tantalum-niobium ores, red mud and so on;
Iron removal and purification of coal, non-metallic minerals, building materials, such as quartz, feldspar, nepheline, fluorite, sillimanite, spodumene, kaolin, etc;
It also used for wet magnetic separation of magnetite, pyrrhotite, roasting ore, ilmenite and other materials with a particle size of 3mm or less.
It fundamentally solves the worldwide technical problem that the magnetic material of the flat ring strong grinding equipment and the flat ring vertical roller mill are easy to block.Under the action of the water flow to the mine spout, the ore particles are loosely fed into the feed area of the tank.
In the magnetic field, the magnetic ore particles are magnetically aggregated and moved toward the magnetic poles and adsorbed on the cylinder.
When the magnetic ore particles rotate with the cylinder, the non-magnetic minerals such as gangues entrained in the magnetic clusters fall off during the turning, and the magnetic cluster finally attracted to the surface of the cylinder is the concentrate.
The concentrate goes to the weakest point of the magnetic system at the edge of the magnetic system with the cylinder, and is discharged into the concentrate tank under the action of the flushing water sprayed from the unloading water pipe.
The disc vibrating screen consists of a single upon which the feed is distributed across and is transported slowly underneath a series of four electromagnets, the vibrating screen fields of which lift the vibrating screen grains off the depending on their susceptibility.
Underneath each magnet is a smaller faster moving across the main at right angles which picks up the vibrating screen grains and transports them away from the vibrating screen field to discharge into launders.
The gap between the main and the magnets becomes progressively smaller until only the non vibrating screen grains unaffected by the vibrating screen fields remain on the main and discharge off the end.
Some alluvial gold with clay, some alluvial gold don't have clay. If need recovery alluvial gold, need washing plant, centrifugal concentration , vertical mill, shaking table, sluice box.Pls check the picture, is very easy to separator this two kinds.
If gold size +3mm, it can use vertical mill.Then without clay mine just need screen machine to separator big size, also if gold size is for 0-3mm, After scrubber machine it can to centrifugal, then to shaking table.
Vertical roller mill is very safe, becauseis don't have chemical agent, and easy to operation.Our factory have much experience for gold recovery, also can do tin . tan, ni, chrome, diamond mine. If you need more details can check: www.jxscmachine.com
Metals that can be extracted include gold, silver or other of the precious group as well as the classic base metals; copper, lead, zinc, nickel, molybdenum.
Much of their ultra-small scale equipment allows to process from just a few kilos (pounds) per day and work on ones passion for a small budget.
The company sellsmineral processing equipmentstarting from crushing, grinding, classification, dredging, gravity separation, flotation, pumps, water treatment and smelting.
A line of ovens, furnaces and laboratory equipment is also available.
The Sand Away is a low-cost high/efficiency black sand coal separator and mini high banker sluice designed with the recreational prospector in mind. The Sand Away is the most versatile and most adjustable coal recovery system for the money on the market today.
The double-decker design provides nearly 4′ of sluice length and the unique converging upper deck and diverging lower deck keeps the material focused down the middle of the sluice while separating out the lighter material more effectively than straight chute systems.
Exclusive hinged designallowscomplete adjustment of angles onboth levelsfor achieving the perfect angle/flow for varying types of material and hardness of water.
Iron ore is a material high in calorific value and carbon content without being highly reactive, which makes it an effective fuel in the metal and ceramic industries. According to the Ceramic Industry website, iron ore is a cheap, readily available energy source that can lower brick manufacturing costs. As of August 2016, 150 heavy clay manufacturing plants operated worldwide using iron ore as the primary fuel.
The scavenging effect of 900mm pitch ball mill has the output of 3.42t/h, the productivity of 32.18%, grade of concentrate mineral 17.46%, recover rate 17.16%, and comprehensive efficiency of 27.74%. In summary, the 1500mm spiral gravity separator with 900mm pitch is suited for the scavenging task.
The concentrated mineral of ball mill then into the spiral gravity chutes of the ball mill process, it is required that the grade of tailings is 65-67%, the distribution width is about 170mm. Take the distribution width test firstly.
As shown in the above table, in the same distribution width, the grade of concentrate is increased by increasing pitch.
The result of that the 900mm spiral classifier has the best beneficiation effect that with high recovery rate and low losing rate in the cases of same grade concentrate ore.
It is suggested that replacing the 1500mm with 900mm to optimize the coarse aggregate grinding line process.
SBM as a 35 years of mineral processing solutions and coarse aggregate grinding processing lines provider, always to support your success by reliable product and good service. We supply industry use gravity spiral separator and laboratory small spiral separator all around the world, spiral separator design is available.
The ultrafine vertical mill can be used in the jewelry industry, because of the diamond body denser than rock, and may also be used in the iron ore industry, since hematite more dense than silica. In the coal industry, where the denseness of coal is less than silica, it can also be used ultrafine vertical mill.Working principle of ultrafine vertical mill technology
The heavy medium mining process relies on a medium of specific density (specific gravity) that is between the density of the minerals targeted for mining. Once the minerals are submerged in the medium, the small density minerals float up, and the larger density minerals sink down.
In recent years, the serious silting problem of 1500mm spiral chute has reduced the mineral classification efficiency greatly of which doesn't separate the concentrate, medium, and tailings ore accurately. Ore deposition not only influences efficiency but also reduce the spiral chute service life.
The observation found that the ore mainly piles in the middle-lower part of the chute body, and the middle part of the cross-section.
The reasons as follows, first of all, the placid chute curve and small inclination angle slow down the flow speed, and weak the fluidity, that easy to cause minerals deposition, especially in the middle-lower part of the spiral chute while mineral preliminary separating.
After crushing by the crushers, chrome grains are liberated or dissociated from the gangue and the mixed ore can be fed to the separation processing for the secondary processing stages.
Vertical roller mill are allocated according to the specific natures of the chrome ore. The main methods for chrome beneficiation are mainly gravity separation and magnetic separation.
And the vertical roller mills are also mainly gravity separators and magnetic separators. So at the beneficiation process, the equipment are quite different from each other because the chrome concentrating methods are different for different chrome ores. Many methods can be used in chrome ore beneficiation plants.
According to the application and development situation of iron ore beneficiation technology in China, we know that researchers think highly of the flotation process which without a collector.
In China, the common biometallurgical process needs to incorporate leaching technology, which has higher requirements for leaching process and is divided into two different leaching process types according to the leaching working method, one is direct bioleaching, another is indirect metabolize leaching.
For instance, under acidic conditions, the thiobacillus ferrooxidant and mesophilic bacteria, they have good chemical separate performance, immerse into the sulfide ore, then dissolve the metal components and ionic structures, final separate the metal component from the sulfide ore.
In the same area, where the gold placer is concentrated where the relative height difference changes from large to small.
The gold particles are transported and moved by various natural forces and will be deposited in a favorable geological environment.
The riverbed alluvial deposit is the most important source of gold deposits in gold production.
Alluvial deposits are formed by a series of deposition processes.
The deposition is raymond mill process, due to the lateral movement of the river channel, the location of the river alluvial gold deposit in the valley is generally not consistent with the current river channel, often occur on the side of a moving curved channel or downstream of a river.
According to the working principles, the gravity separation process can be divided into ore washing, particle grading, gold sluice, gold jig, gold shaker and heavy medium separation. Among them, except for washing and grading, which are mainly separated by particle size, the other is the process of separating the minerals by specific gravity (density).
Considering environment and technologies, two sand-making methods-by dry-process and wet-process, are gradually mixed with each other. Chinese machine-made sand production is entering leaping development stage. As the domestic famous enterprise configuring aggregate production line, GK becomes the focus of this field.
Ultrafine vertical mill production lines are widely used in aggregate plants, mines, metallurgy, building materials, roads, railways, water conservancy, chemical engineering. The capacity varies from 50 t/h to 1000 t/h with granularity arranged and classified in terms of different demands.
In order to ensure the high efficiency and energy saving of the limestone powder production process, it is necessary to strictly control the moisture content of the product. For the analysis of some characteristics of limestone, combined with its production advantages to control the moisture content, in order to improve the overall production efficiency and ensure efficient yield.
Ultra-fine vertical mills are advanced in many aspects compared to the traditional technology of limestone processing. This production technology combines the characteristics of limestone into powder, according to the crushed mill.
vertical roller mill operation: https://www.gravelmill.com/solutions/vertical-roller-mill-operation.html
With many years of rich experience and high design level accumulated in the building materials industry, new areas are opened up in the vertical roller mill desulfurization limestone crushing projects. And the cooperation with Datang, to the Union, Shendong and other companies fully proves that we already had a strong strength and are the first company to enter the field of China's power industry environmental protection.
LM vertical roller mill uses the technology of flue gas desulfurization dry limestone, and carries out the policy of saving investment, reliable production, easy operation, advanced technology, meeting the environmental protection and improving efficiency and makes contribution to the desulphurization and superfine limestone crushing projects of vertical roller mill.
LUM ultrafine vertical mill: https://www.gravelmill.com/product/grinding/lum-ultrafine-vertical-roller-mill.html
The width of vertical roller mills is generally 50-300m or wider, and the length can reach several kilometers or even tens of kilometers; generally it is made up of soft sandstone; the buried depth of the ore is generally 1-5m, some would 20-30m even deeper; the thickness of the gold-bearing ore layer is usually 1-5m; the bottom of gold layer is mostly granite, shale, limestone.
In addition to gold, vertical roller mills also contain a variety of heavy minerals, which associated with gold, magnetite, ilmenite, rutile, garnet, zircon, hematite, chromite, olivine, epidote, pyrite, monazite, limonite, platinum, antimony, cinnabar, wolframite, scheelite, cassiterite, corundum, diamond, mercury paste, galena, etc.
In addition to the above two accidents, you need to pay attention to stopping the feeding operation when shutting down. After the LUM ultrafine vertical mill equipment is shut down, the unfinished materials should be removed from the equipment. You are almost done doing these tasks, and then you have to follow the manufacturer's suggestions.
Thank you for your guidance. With these valuable opinions, the service life of the LUM ultrafine vertical mill equipment will be longer, better work, and greater contributions to the grinding production line.
After sales again, after the manufacturer sells the mill, the customer may not understand the information of the superfine grinding machine. If the manufacturer can provide some knowledge training on the structure, principle, use, etc., then the operation in the production will be more convenient. And when a customer encounters a problem that cannot be solved, if the manufacturer provides some help, the problem can be solved well;
Summary: The article mainly introduces the problems that customers will care about during the development of vertical roller mill equipment, mainly in three aspects: quality, performance and after-sales. The article analyzes these three aspects in detail.
The ultrafine vertical mill has the advantage of low loss in addition to better production capacity, because the equipment uses a special production process in view of the disadvantages of traditional grinding equipment in the production of large losses, which makes the structure of the equipment a lot stronger. It can reduce the maintenance cost of the equipment in the production process and save the investment of the project.
barite-mtw110-2
The ultrafine vertical mill uses a high-efficiency turbine classifier, which is currently a relatively advanced classifier system in the world, which can effectively enhance the accuracy of the equipment classification, and the hammer head and other important parts of the equipment are all special.
The reason why large carbon black vertical roller mill manufacturers can occupy a place in the market and can withstand changes in market demand depends not only on the quality of the machine, but also on the excellent strength of the manufacturer. This article will analyze What are the problems with the advantages of large carbon black mill manufacturers.
The number of points and meshes is fine, up to 1250 meshes
When the carbon black vertical roller mill is working, the carbon black material is sent between the grinding roller and the grinding ring. The material is crushed into powder under the action of the rolling pressure, and then the powdered material is blown up under the action of the fan and analyzed.
In the production process of vertical roller mill, the improvement of efficiency is a constant topic. In the actual production process, efficiency is related to many aspects. The more important one is the choice of mill model. A suitable vertical roller mill can better improve the production efficiency. If the selected machine itself is not suitable, it is difficult to bring better production efficiency to the production process.
The old saying goes well: "Workers must first sharpen their tools if they want to do well", which means "to do a good job, you must first sharpen the tools, and do one thing well, preparation is very important", especially In the mining industry, it is particularly important to choose a suitable production equipment. The type of vertical roller mill equipment we call is mainly used to produce fine powder. If the type is unreasonable, it cannot be completed with specific properties. The grinding of materials cannot be processed normally, so the selected model is very important.
The point is that the size of the air volume is directly proportional to the production capacity, that is, the larger the air volume, the greater the production capacity will be during the production process. Therefore, if you want to increase the production capacity, you need to perform vertical roller mill while meeting the demand for finished products. Set the air volume reasonably;
The second point is to ensure reasonable operation. This point mainly refers to the standardization of operation. As long as it is carried out in accordance with the operating regulations when leaving the factory, in this process, in order to better ensure the production process, we also need to Reasonable maintenance of the ultra-fine mill, such as lubrication, overhaul, etc., has a definite period.
The components of the vertical roller mill are always inevitable in the production of such or other failures. Only a good solution to these failures can ensure the good working condition of the equipment, so the topic of this article is to introduce the vertical roller mill How to solve the problem of component failure in production.
Shanghai Zenith has been engaged in the production of mining machinery for more than 20 years. We have not only studied the technology of the equipment, but also invested a lot of research efforts on the failure of the equipment during the work process, and the problem of the failure of the components of the vertical roller mill equipment.
The ultrafine vertical mill is widely used in the production line of bauxite, slag, water slag, clay, bentonite and other materials. It has a series of advantages such as low cost and high efficiency.
It is welcomed by many industries such as mining and metallurgy, but In this case, many manufacturers have not developed well. This phenomenon is mainly due to the quality of equipment and the vicious competition in the market. So how can ultra-fine grinding manufacturers develop better and carry forward their own brands?
First of all, let's talk about the quality problem of the ultrafine vertical mill. This is the fundamental reason why customers choose this equipment. If the quality is not good, it will be difficult to bring good production efficiency to the production process, and the quality will not be closed during production.
The second point is the influence of the speed of the fan of the ultrafine vertical mill on the particle shape. The speed of the fan has a direct influence on the wind. The magnitude of the wind will have an important influence on the material, because the collection of finished products in the production mainly depends on the wind;
The third point is that the speed of the main engine also affects the grain shape of the ultrafine vertical mill. The machine speed directly determines the size of the finished product, so if the speed is too high or too low, it will affect the finished product.
The influencing factors of the ultrafine vertical mill particle type introduced above mainly include the degree of wear of the grinding roller and the grinding ring, the speed of the fan of the fine mill, the speed of the main engine and the blades of the analyzer. These four factors affect the fine powder The main factors of grain size, controlling these factors during production can produce finished products that are more in line with customer needs.
The machine has a high degree of automation, thin oil lubrication, automatic control device and limit device to ensure the stable operation of the equipment. The chemical composition of the finished coal powder prepared by the mill is stable, the fineness grade is high, and the particle size distribution is reasonable. Moreover, the machine has the advantages of low cost, strong drying capacity, fully sealed production system, no dust and clean environment.
Shanghai SBM provides customers with one-stop service, from equipment selection, process design, to installation and commissioning, follow-up follow-up maintenance, so that customers can save effort.
Ultrafine mill has an impact on its working process, but the operations in the production engineering will also affect the work of ultrafine vertical mill. Therefore, ultrafine vertical mill has operating instructions when it leaves the factory. Operating ultrafine vertical mill according to these instructions can make ultrafine vertical mill better Work, here is what should be paid attention to in the production of ultra-fine vertical mill equipment.
Although ultrafine vertical mill has operating instructions, it is difficult for staff to perform these operating items well if they do not understand the operating items. Therefore, it is more important to train professional staff to have a certain understanding of the Structure And Principles Of The Equipment.
Then there is market advantage. We know that the direct downstream enterprises of the cement industry are the building materials industry, and the development of my country's building materials industry in recent years is obvious to all. As the pillar industry of the building materials industry, the cement industry has a market development prospect that can be imagined.
Moreover, with the increasing market competition among upstream cement companies & mdh; cement crushing and grinding equipment manufacturers, the cement equipment industry will surely promote technological innovation and speed up the speed of product upgrading, which in turn promotes the efficient and effective cement production. High-yield, high-tech content.
The feed size is less than 10mm, the production capacity is 5-18/H, and the finished product has a fineness of 400-2500 mesh and the sieving rate reaches 97%. The birth of the LUM series of ultrafine vertical mill has broken through the development bottleneck of the general low production capacity of ultrafine vertical mill, and has guided a new direction for the development of the ultrafine vertical mill industry.
Answer: LUM series ultrafine vertical mill can realize large-scale ultra-fine dry powder processing of calcite, marble, limestone, heavy calcium, talc, barite, kaolin, dolomite and heavy calcium and other non-metallic minerals. Limestone is used for desulfurization in power plants and steel plants. It is also widely used in large-scale projects such as the grinding of powder, the deep processing of slag powder and the preparation of blast furnace injection coal powder.
In the interior of the vertical roller mill, the material after the sorter is ground and dried enters the part along with the air flow from the lower part for sorting operation. The purpose of sorting is to obtain a better quality of the finished product. There are moving and static blades, and the welding must be firm, otherwise it will cause accidents such as shutdown.
The maintenance of this part is divided into the inspection and repair of the moving blades and the static blades. When the moving blades are overhauled, they need to be vibrated with a hand hammer one by one. See if there is any movement of the blade. If so, it needs to be fastened, marked, and welded and strengthened.
If severely worn and deformed blades are found, they need to be removed, and new moving blades of the same size shall be installed according to the requirements of the drawings, and they shall be weighed before installation to prevent loss of balance. When the stationary blades are overhauled, they need to be overhauled.
Remove the five moving blades in each layer of the squirrel cage of the fine grinder to leave enough space to observe the connection and wear of the stationary blades. Rotate the squirrel cage to check whether the connection of the stationary blades is welded or worn. The grinding parts need to be welded firmly with J506/Ф3.2 welding rod. Adjust the angle of the stationary blades, the vertical distance is 110 mm, and the horizontal angle is 17° to ensure the quality of powder selection.
The second is daily maintenance, which mainly refers to the maintenance of ultrafine vertical mill during the working process to reduce the damage in the production of ultrafine vertical mill, help to extend the service life of ultrafine vertical mill, and make ultrafine vertical mill better serve the production line, and ultrafine vertical mill encounters severe vibration during production. Other problems also have a great impact on production, so daily maintenance mainly includes the following aspects:
For the problem of excessively large particle size in the production of ultrafine grinding equipment, it may be caused by spring wear or excessive gap between the spring and the high-pressure plate. Therefore, the spring needs to be replaced or adjusted, and the spring and the high-pressure plate The gap is generally kept between 15-20 mm;
If the type of ultrafine vertical mill lubricating oil is wrong, the oil used for lubrication will deteriorate or evaporate due to high temperature and high pressure, thus losing the function of protecting and lubricating the roller bearing, which will increase the heat generated by the friction of the roller bearing. , Resulting in an abnormal increase in bearing temperature.
In addition, if the ultrafine vertical mill lubricating oil is too little, or if it is not replaced in time, it may cause the ultrafine vertical mill lubricating oil to lose its original function, resulting in insufficient lubrication of the roller bearing, and will also increase the bearing temperature and cause premature damage to the bearing.
Due to the harsh working environment of ultrafine vertical mill, which is accompanied by a large amount of powder for a long time, the filter screen of the fan is easy to be blocked, so the technicians should clean it frequently and try to do it once every half a month.
And because the temperature of the working environment is high, the air duct is prone to softening and deformation or air leakage. It should also be checked every half a month to kill the fault in the cradle.
However, the working conditions in the vertical roller mill are very complicated, and the dust concentration in the suspended state is very high. The following situations often occur during the production process:
The air pressure of the sealing fan is low or the filter screen and filter cloth of the sealing fan are blocked by dust, which causes the sealing air volume and air pressure to enter the grinding cavity to decrease;
The flange of the wind pressure sealing pipeline and the joint bearing on the sealing pipeline in the vertical roller mill have poor sealing and air leakage, which reduces the wind pressure entering the grinding roll cavity;
When the vertical roller mill is running or stopped, the unreasonable drawing of the wind in the vertical roller mill will produce a slight negative pressure in the grinding roll cavity.
The above reasons may cause the air volume and air pressure to enter the grinding roller cavity to decrease, and it is easy for micro-particle materials to enter the sealing air cavity of the grinding roller, damaging the sealing ring and oil seal of the grinding roller, and causing oil leakage or bearing damage to the grinding roller.
At the same time, closely observe the changes in the oil level of the oil tank. When the oil level of the oil tank is found to fluctuate abnormally, it is necessary to carefully analyze the cause, find the crux of the problem, and deal with it in time to prevent bearing damage due to lack of oil or excessive refueling. Burst.
Regularly add grease to the sealing rings on both sides of the vertical roller mill. The general addition cycle is one month. It is added when the vertical roller mill is hot and lifted by hydraulic pressure, and the vertical roller mill is manually rotated while adding. Do not add too much to prevent the grease from being squeezed and sealed.
Regularly inspect the oil quality and detect the content of metal particles in the oil sample to determine the bearing damage. At the same time, keep the lubricating oil clean, and judge whether to replace the lubricating oil according to the oil quality and the replacement interval of the oil filter.
Compared with ordinary liners, the heat resistance and strength of composite liners have been greatly improved. Especially in terms of service life, composite liners are twice as effective as traditional liners, which greatly improves the economic benefits of enterprises. In addition, the composite liner has low working noise, light weight, and is easy to promote, but it lacks practice. However, there is a lot of room for development in dealing with the problems of liner aging and liner wear.
Automatic grading linings such as angle spiral linings, cone grading linings, etc., can make the grinding bodies of different gradations in the cylinder, along the axial direction of the mill, according to the change of the grinding particle size, reasonably positively classify, so that various Grinding bodies of different diameters exert their greatest function in the process of crushing materials of corresponding particle sizes.
In other words, the automatic grading liner can gather the larger steel balls in the same grinding bin at the feed end of the bin to smash larger pieces of material, and at the same time make the smaller steel balls gather at the discharge end of the bin.
Trouble phenomenon:
The coal quality changes greatly, and the raw coal has a large moisture;
Improper adjustment of air and coal volume, out-of-balance of air-to-coal ratio, and too small primary air volume;
The inlet air temperature of the vertical roller mill is too low;
The entrance of the stone coal hopper is blocked or the slag is not discharged in time;
The coal feeder control device is malfunctioning.
Solution:
1. Reduce the amount of coal fed, increase the primary air flow, and increase the outlet temperature of the mill; take precautions during processing to prevent a large amount of coal powder accumulated in the mill from suddenly blowing into the furnace, causing a sudden increase in boiler load and steam pressure;
2. Increase the number of discharges of pebble coal;
When the moisture content of the material is high, the material is easy to adhere to the grinder, and it is also easy to block in the process of feeding, which results in the reduction of the grinding capacity and the reduction of production efficiency.
At the same time, it will block the circulation air duct, discharge port of analyzer, etc., so the water content of materials should be controlled. Generally, the moisture content of the material can be controlled by drying operation before production.
The fine powder contained in the material also affects the production efficiency of the grinder. Because these fine powder is easy to adhere, affecting the transport. When the fine powder is more in the material, it is easy to adhere to the equipment during grinding, which affects the transportation. For such materials with more fine powder, the sieve shall be conducted one time in advance.
The requirements of each type of ultrafine vertical mill for the moisture content of materials are different, but the production efficiency of any type of equipment will be greatly affected by the water content.
The fine powder contained in the material also affects the production efficiency of vertical roller mill. Because these fine powder is easy to adhere, affecting the transport. When the fine powder is more in the material, it is easy to adhere to the equipment during grinding, which affects the transportation. For such materials with more fine powder, the sieve shall be conducted one time in advance.
Heat treatment of lining plate is an important way to reduce wear of lining plate of vertical roller mill. Therefore, proper heat treatment process should be selected according to the material of lining plate.However, in actual work, the relevant staff lacks the knowledge of lining material, so in heat treatment, the processing of lining is not enough, which not only does not play a strengthening role, but also makes the strength of lining lower. When hit by steel balls and materials, plastic deformation will occur.
There are two main reasons for frequent start-up of high pressure pump
One is the damage of the rod seal of the hydraulic cylinder, and the leakage in the cylinder is caused;
Second, leakage or damage in return valve (or pressure relief valve) causes frequent action of high-pressure oil pump.
Measures can be taken to inspect and deal with in production from the following aspects:
One is to check whether there is internal leakage in hydraulic cylinder. The most direct method is to shut down the oil pump of the tension hydraulic station after grinding is stopped. Observe whether the oil pressure of the hydraulic station gradually drops under the static state. If the drop indicates that the hydraulic cylinder has internal leakage, the seal should be replaced in time.
Long-term wear causes the shape of the grinding roller to change, the grinding roller is not round, and it collides with the grinding ring during the rolling process and vibrates violently. The grinding roller should be replaced in time.
The analysis machine blade is unbalanced
Check whether the blades of the analysis machine are intact. In order to save trouble and cost, some manufacturers install the blades without debugging, resulting in unqualified production in later stages and causing vibration.
The Internal Parts Of The Equipment Are Loose
The biggest components inside the ultrafine vertical mill are the plum blossom frame and the grinding roller. These two components are connected by bolts. When the equipment is running, a strong airflow will be generated inside. If these two parts are loosened, the airflow will become very unstable, and will gradually vibrate and cause noise.
Therefore, in order to ensure the normal operation of the roller bearings, the following points need to be done in daily maintenance:
Ensure the normal operation of the sealed fan. The wind pressure should not be lower than the specified value. Under normal circumstances, it should be kept above 20Bar. Regularly check whether the sealed air duct is damaged; the joint bearing at the joint between the sealed air duct and the ultrafine vertical mill in the grinding cavity Whether the flange is disengaged, etc.
At the same time, in order to ensure that the positive pressure air entering the ultrafine vertical mill is clean, a filter screen and filter cloth must be installed at the entrance of the fan to prevent micro-particle materials from entering the sealing air cavity of the ultrafine vertical mill, damaging the sealing ring and oil seal of the ultrafine vertical mill, and causing the ultrafine vertical mill Oil spill.
Therefore, in order to ensure the normal operation of the roller bearings, the following points need to be done in daily maintenance:
Ensure the normal operation of the sealed fan. The wind pressure should not be lower than the specified value. Under normal circumstances, it should be kept above 20Bar. Regularly check whether the sealed air duct is damaged; the joint bearing at the joint between the sealed air duct and the ultrafine vertical mill in the grinding cavity Whether the flange is disengaged, etc.
At the same time, in order to ensure that the positive pressure air entering the ultrafine vertical mill is clean, a filter screen and filter cloth must be installed at the entrance of the fan to prevent micro-particle materials from entering the sealing air cavity of the ultrafine vertical mill, damaging the sealing ring and oil seal of the ultrafine vertical mill, and causing the ultrafine vertical mill Oil spill.
Causes: 1) feeding speed is too fast; 2) The air duct is blocked by powder, and the pipe exhaust is not smooth.
Solutions: 1) reduce the amount of feed, 2) remove the dust accumulation at the air duct or open the residual air pipe valve, and control the temperature at the feed inlet below 6 ℃.
2. The Main Engine Of Vertical Roller Mill Starts Slowly
Causes: 1) insufficient power distribution; 2) The voltage is unstable.
Solutions: 1) check whether the motor is in line with the power of vertical roller mill, and replace the suitable motor power; 2) Check the power line and set the voltage stabilizing device.
If the grinding fineness is required to be finer, angle irons of a certain height can be welded on both sides of the classifier, and the level of the overflow weir of the classifier can be adjusted by the method of inserting wooden boards. Sometimes long-term accumulation of mineral mud can naturally increase the height of the overflow weir.
In production, the vertical roller mill must supervise the crushing system. If the particle size of the vertical roller mill to the ore changes during reproduction, it must be immediately fed back to the crushing workshop. The final requirement is that the finer the crushing particle size, the better, and "more breaks and less grinding" saves production costs.
The broken line impact plate has a simple structure, but it can not guarantee the most effective impact crushing of ore. therefore, when purchasing and debugging the impact plate, we must pay attention to the angle of the impact plate, so that when the material collides with the impact plate, it can be perpendicular to the impact plate, so as to improve the production capacity of the impact plate.
The arc-shaped impact plate is commonly used in involute linear structure. The characteristics of this structure are that at each point of the impact plate, the ore is impacted in the vertical direction, resulting in higher crushing efficiency and higher production capacity.
Cement water demand directly affects the water-cement ratio of concrete, which affects the strength of concrete, corrosion resistance, frost resistance, durability, the amount of concrete produced by concrete and the amount of admixture, affecting the cost and benefit of the user.
Large amount of Cement standard consistency water demand, the more cement paste to achieve the standard consistency of water consumption, the more cement mortar to achieve the required flow of water, and cement concrete to achieve a certain amount of slump water consumption are also larger, so the greater the water-cement ratio of mortar and concrete, the more space between the particles, the smaller the density, the cement and its concrete construction performance, mechanical properties and durability deterioration will get worse.
Reduce the looseness of lining plate. The looseness of the liner will cause the relative movement between the liner and the conical body, which will aggravate the wear. Therefore, a soft metal gasket can be padded between the lining plate and vertical roller mill, and the bolt can be used for fastening, so as to ensure the leveling between the two, and reduce the breakage or wear phenomenon caused by the loosening of the lining plate.
Improve the stress state of lining plate. In order to make each point of the lining plate bear uniform force, plastic precipitation is often placed between the lining plate and vertical roller mill, such as lead plate, aluminum plate, zinc alloy plate, low carbon steel plate or cement mortar, to ensure the close combination of the lining plate and vertical roller mill.
Select Bearing With High Box Size
The vibration of the bearing during operation includes two aspects:
One is structure: the rolling body causes the small change of the axis position through the composite action, which causes the vibration;
The second is manufacturing: the geometrical errors of rolling body, inner and outer ring, cage and so on will cause vibration.
The load, speed, lubrication and working clearance will affect the vibration of the bearing to varying degrees. Therefore, when selecting the bearing, the bearing life conditions must be satisfied first, and the bearing with smaller size and higher box size shall be adopted as much as possible.
The first control mode has no speed regulation function, and the motor can not be started frequently. It is generally used on the ultrafine vertical mill with the length of more than 500m and the motor can not be started frequently.
The second control mode has no speed regulation function, but the motor can be started frequently. With SCR power brake, it is a common driving mode for the downward transport of ultrafine vertical mill.
The third control mode has the function of speed regulation, which can be used as closed-loop control. It is generally used in large-scale ultrafine vertical mill with the length of more than 1000m and the function of speed regulation is required.
Vertical roller mill is an indispensable abrasive equipment in many mining companies, and it is an important basis to ensure the normal operation of industrial production. Daily maintenance is very important.
1. there is oil groove in the contact angle scraper, but it is necessary to note that it cannot be scraped through.
2. daily maintenance is very important.
3. in normal working process, the cracked cylinder under working condition shall be renewed and replaced at the first time once the bolt is loose or the lining plate is falling off.
This method is also the key reason for abrasive wear and oil blockage of spherical bearing shells. Therefore, during the maintenance, the wear of sealing ring should be checked timely. If the degree is serious, it should be replaced and updated, which will block the dust.
Many manufacturers have also improved and optimized on this basis. In order to avoid oil leakage, the main bearing adopts more advanced piston seal.
The advantage of mobile station is that it is convenient for it to move flexibly, and it can directly enter the site for milling work, leaving a large amount of cost to the owner, This is also the reason why many consumers choose vertical roller mill.
At present, the most used construction waste is broken, and the construction waste is not concentrated. The use of mobile station can solve this problem, realize the use of construction waste recycling equipment, make construction waste into sand and brick, and truly turn waste into treasure.
The adjustment method of tail roller is just opposite to that of head roller. The specific method is which side of the belt, which side of the idler group moves forward towards the belt, or the other side moves backward.
In general, this method is more suitable for the vertical roller mill with bidirectional operation state or the total length of the vertical roller mill is short. This is mainly because the shorter vertical roller mill is more prone to run off and is not easy to adjust compared with the longer belt conveyor, If the long vertical roller mill adopts this rule, it will affect the service life of the belt.
Solution: It is suggested to separate the long oil pipe from the wall of the machine tool and install support pipe clamp properly.Adjust installation accuracy of motor and hydraulic pump;Reinstall the coupling to ensure that the coaxiality is less than 0.1MM etc.
In addition to routine maintenance, when the ultrafine vertical mill encounters abnormal phenomena in operation, check the fault parts and causes one by one and take corresponding measures in time, so as to avoid greater losses.
If there are bright steel particles, it indicates that the working pump of vertical roller mill has wear problems.
If aluminum particles are found, it indicates the wear of vertical mill.
If there are black or copper particles, it means that the clutch wear failure.
In addition, the magnetic filter screen under the oil pan needs to be removed for inspection to see if there is any steel debris. Through the inspection of the above parts, it can be determined whether the oil temperature rise is caused by the component damage.
The standard operation and regular maintenance of vertical roller mill will also affect the sand production of the equipment. If the operation of a vertical roller mill is not standardized and regular maintenance is not carried out, the wearing of vulnerable parts of the equipment will be accelerated, the service life of the equipment will be greatly reduced, and the production volume per unit time will be small.
The leakage of the vertical roller mill hydraulic system is mainly caused by the pressure difference and the gap between the components when the liquid flows in the hydraulic components and pipelines. There are two types of oil discharge in the vertical roller mill hydraulic system.
One is the oil discharge sealed by the static joint surface (i.e. the fixed part, mainly including the joint between cylinder head and cylinder barrel, the connection of each pipe joint, etc.); The second is the oil release of the sealing of the dynamic joint surface (i.e. sliding part, mainly including multi-channel valve stem, cylinder piston and inner wall of cylinder barrel, piston rod and guide sleeve of cylinder head, etc.).
The "gradual water injection method" should be adopted to gradually cool down, but not too much water can be added too quickly, that is, while the water is being added, the engine is idling, and the tank is slowly filled with long water to ensure the safety of operators and equipment.
In addition, when the brake or other parts are overheated, it is not allowed to cool down with water, which will reduce its life and performance, causing deformation or even cracking of the parts, so it must be shut down to allow it to cool naturally.
The above is the emergency treatment method when the vertical mill is in high temperature failure, and it is hoped that it can be helpful to the user.
In order to give full play to the grinding efficiency of ultrafine vertical mill, the influence of mill design operating parameters must be attached importance. The improper selection of grinding parameters will cause the efficiency of the ultrafine vertical mill to be greatly reduced, and even can not work normally.
Among the working parameters of ultrafine vertical mill, the speed rate and filling rate have the most significant influence on the working state of the ultrafine vertical mill.
Grinding process is the process of material decreasing from large particles. In different grinding stages, the influence of speed rate and filling rate on product granularity is different.
Generally speaking, the forms of solid particles accelerated by high-speed airflow are mainly composed of the following three methods:
Airflow particle acceleration nozzle: the airflow and particles are fully mixed and then accelerated by the nozzle, which can make the particles obtain a very high speed (almost the same as the airflow speed), but the material has serious wear on the inner wall of the nozzle, so it is rarely used in practice.
Syringe accelerating particles: high speed (supersonic) airflow and particles are mixed and accelerated in the mixing tube, and the particles get higher speed, but the material has serious wear on the mixing tube.
Free air acceleration particles: particles enter the high-speed air beam as a free falling body to be accelerated. At this time, there is only high-speed air flow through the nozzle, and the wear is very small. However, due to the low falling velocity (transverse) of particles, it is difficult to get into the center of the air beam (high-speed air flow) and obtain high velocity.
Because the compressed high-speed air velocity decreases after crushing, the volume increase belongs to the heat absorption process, and has cooling effect on the material, so it is particularly suitable for ultra-fine grinding of heat sensitive materials.
However, one of the disadvantages of ultrafine vertical mill is the high energy consumption. Therefore, how to reduce energy consumption and improve production efficiency is one of the difficulties in air flow pulverization.
Big and small bevel gears are worn and broken
reason:
1) The normal meshing condition of bevel gear is destroyed
2) Rigid connection transmission
3) Too much iron or being bitten by large pieces
Before starting, it is necessary to carefully check whether there is ore or foreign matter in the crushing chamber; Before start-up in winter, use electric heater to heat the oil to 15 ℃ before start-up, and the oil level is between the upper and lower limits;
Start the oil pump, wait until the oil pressure is stable at 0.07-0.13mpa, and the lubricating oil in the oil return pipeline returns to the oil tank, then start ultrafine vertical mill, and start feeding after no-load operation for 10min.
The project has achieved good results, solved the problem of the short service life of the vertical roller mill, reduced the frequency of maintenance and repair of the heavy apron feeder, reduced the labor pressure of the maintenance personnel, and improved the operating efficiency of the equipment and the stability of the production system.
SBM, 35 Years of mining equipment manufacturing, provides types of ore feeders around the world (apron feeder, vibrating feeder, chute feeder, disk feeder, etc).
We are here help to help mining machine selection, mineral processing solutions, processing plant optimization.
More than 20 household chemicals and other products are used as fillers. The mills produced by Qingdao Raymond mills include Raymond mills, high-pressure suspension roller mills, high-pressure micro-powder mills, straight-through centrifugal mills, overpressure trapezoidal mills, and three There are several categories of ring medium speed grinding and three-roll grinding.
The grinding equipment produced by the Qingdao Raymond mill manufacturer is a well-known Raymond mill brand in China. The Qingdao mill is composed of three systems: grinding, analysis, and dust removal. The raw materials can be processed by the Qingdao ultrafine mill. The granules are formed into powder at one time, the degree of fineness is stable and the probability of passing the screening exceeds 99%.
This effect is called export classification. The classification function of the mill itself will affect the residence time of materials in the mill, and the inhibition effect of different discharge methods is different.
For lattice ball mill, the effect of lattice has a greater inhibition on the discharge of large particles, even if the lattice opening is large, it will also prevent the discharge of some large particles.
Ball mill is widely used in cement, silicate products, new building materials, refractories, fertilizers, ferrous and non-ferrous metal mineral processing, glass ceramics industry, ground processing and grinding of some filling materials, etc.
The grinding medium of ball mill can be different materials, such as ceramic ball, flint and stainless steel ball. Aggregate sand and gravel can be operated continuously with ball mill, and the feed port is at one end, and the other end can discharge materials.
The large and medium-sized ball mill rotates on the axis, but the small one usually includes a sealed end cylindrical container, which is located between two driving shafts, and the driving shaft is a pulley and belt used to transmit the rotary motion.
We all know that the price of purchasing a vertical roller mill equipment is relatively high. Generally, enterprises will try their best to maintain the equipment so as to extend its service life, improve work efficiency as much as possible, and bring high benefits to the enterprise.
However, the maintenance cost caused by improper operation is also very high, which will increase the production cost of the enterprise. Therefore, the preventive maintenance plan of enterprise equipment is essential.
Compared with traditional grinding machine, it has higher production efficiency and can process raw materials to 2500 mesh. It is a popular equipment in the market, Its excellent performance has been confirmed in barite powder production lines in major regions. It can be said that it is the best equipment in barite powder industry. I believe that in the near future, with continuous innovation and development, barite grinding mill will bring greater surprise to the industry and drive the development of more industries.
There are two kinds of impact blocks in the sand making machine: artificial sand And natural sand. The latter is more popular with users, because the rhombic combined impact block can avoid material impact damage to the vertical plate, improve its own wear resistance, and can also be used alternately, which not only improves the utilization rate of materials, but also effectively protects the service life of the inner guard plate of the sand making machine.
Design Difference Of Crushing Chamber
The high-quality sand making machine has the optimal launching port and internal smooth curve design, which reduces the flow resistance of materials, greatly improves the passing capacity of materials, and further improves the production efficiency of sand making.
In addition, the rotor as an important crushing part of the sand machine, its design affects the sand yield and sand stone shape, and the deep cavity rotor greatly improves the material handling capacity.
Once the abnormal noise or vibration is encountered in the process of silica sand, it is generally caused by the unstable bottom of the equipment or excessive material addition, which needs to be handled in time.
After running for a long time, there will be a lot of dust inside or on the surface of silica sand grinding mill. If the dust accumulates too much, it will lead to the generation of static electricity, which will bring great damage to the equipment.
Therefore, the silica sand grinding mill should be maintained and cleaned regularly to remove the dust and other impurities, so as to ensure the efficient operation of the equipment next time.
For the processing of calcite, the first thing we think of is crushing technology. The calcite grinder milling plant machine used includes jaw crusher, hammer crusher (impact crusher), vibrating feeder, vibrating screen, belt conveyor, etc. the specific working process is as follows:
1. Its production capacity is very high, the output is as high as 800 tons per hour, high-yield production line can create more economic benefits for users.
2. The operation is more simple and convenient. Due to the high degree of automation of the production line, it reduces the application difficulty of users to a certain extent.
Therefore, many people choose ore milling plant, which can indeed double its capacity growth. So, when we need to buy ore milling plant, what should we do? In choosing an ore milling plant, we should not only look at the price of the equipment, but also look at the quality of the product and the reputation of the ore milling plant manufacturer, so as to select an ore milling plant suitable for ourselves to the greatest extent.
The most important thing is to understand the after-sales service of ore milling plant manufacturers, so as to make the greatest guarantee for their own production line.
There are many matters needing attention during operation. Here, it is hoped that all operators should pay great attention to some common matters and operate the equipment in strict accordance with the production requirements.
At the same time, attention should be paid to prohibit some inoperable behaviors, conduct comprehensive inspection and maintenance of aggregate crush regularly, and eliminate faults in time to ensure the normal operation of the equipment and ensure the maximum production benefits of the enterprise.
Some customers reported that when Raymond Mill processed calcite mineral powder, 325 mesh mineral powder contained a large amount of 10um ultra-fine mineral powder. If 10um ultrafine ore powder can be separated and the output can be expanded, the benefit will be greatly improved.
Practice has proved that when the calcite with the feed size of 25mm is selected for grinding, when the fineness is adjusted to 1250 mesh (10um), the output can reach 450kg / h, and the input power only needs 23KW, which has significantly higher cost performance than the traditional Raymond mill. If necessary, customers can consult our online customer service for Raymond Mill quotation.
Cement raw materials commonly used in production are mainly calcareous raw materials, clayey raw materials and a small amount of correction raw materials mixed in proportion.
These raw materials can be processed into high-quality cement by dry or wet method, which can be used in civil construction, water conservancy, national defense and other projects. However, no matter which processing method, the processing of cement raw meal is unchanged.
It can automatically open and close according to the incoming materials, which can effectively prevent the grinding roller and teeth from being damaged due to the sudden interruption of incoming materials during normal production, and lay a foundation for the production automation of the pulverizing workshop.
For example, marble, limestone, gypsum, coal, clay, pigment and other materials often seen in life can be mixed in ultrafine mill and then produced into materials required for construction sites, And more importantly, the materials processed by this equipment will not easily produce any chemical reaction or explosion at high temperature.
Why are the prices of different clay production lines different, because the materials composed of different machines will be different. Although the working principles are the same, the prices are still different when merchants buy because of different materials. The following describes the detailed working principle of ultrafine mill.
When purchasing barite ore grinding mill, you must find professional well-known manufacturers, so that the product quality produced by such manufacturers can be more guaranteed. In reality, many users only pay attention to the price of equipment and blindly crave for cheap.
Therefore, when purchasing barite ore grinding plant, it is necessary to compare, select well-known manufacturers, and pay attention to after-sales service, so that it can be repaired in time in case of equipment failure, reducing a lot of trouble. The principle of barite ore grinding mill is not as simple as expected.
In an ore production line, many kinds of equipment are needed, including crusher, ultrafine mill, screening equipment and other auxiliary equipment. Crushers are divided into many types, such as jaw crusher, impact crusher, roller crusher, cone crusher and so on.
Grinding machine is divided into ultra-fine grinding, T-shaped grinding and so on. According to the required material fineness, customers need to choose different mills. The price difference is also shown here. Correctly budgeting the cost of an ore production line can help customers better grasp their investment and income.
Once the moving disc of mill rotates, the grinding ring will gradually cut the materials. According to the different needs of production, the installation accuracy and speed of the motorized stationary plate of vertical roller mill can be adjusted reasonably, which will minimize the damage to equipment and the waste of materials in the production process.
Fly ash has the characteristics of high strength, so it is very important to select a suitable grinding equipment in fly ash production. Compared with the traditional grinding equipment, the new vertical roller mill has great advantages both in terms of material strength and overall output. The materials produced by the new vertical roller mill have uniform fineness and smooth appearance, and the concrete produced by mill will have higher strength.
For example, a number of cement industries were banned and merged last year, which greatly reduced China's environmental pollution. As we all know, the mining machinery industry is also an industry with high energy consumption and high pollution. In order to develop well, we must take the green environmental protection route.
Therefore, as an ultrafine mill equipment to promote the development of milling industry, it is necessary to put & ldquo; The concept of "green" is introduced into its production and development. In addition, this is the inevitable trend of the future development of the machinery industry, not only in the future, but also at present.
If LM vertical roller mill has poor ventilation effect and the water vapor cannot be discharged in time, the water vapor will adhere to the lining plate and steel ball of LM vertical roller mill, Cause paste ball or paste grinding. Therefore, it is necessary to control the ventilation volume of LM vertical roller mill.
The passing effect in LM vertical roller mill is good, which can not only bring out qualified fine materials in time, but also effectively reduce over crushing and reduce the temperature of LM vertical roller mill.
The feeding of LM vertical roller mill is unreasonable. During the operation of LM vertical roller mill, uniform feeding is a necessary condition to ensure the normal operation of LM vertical roller mill.
However, LM vertical roller mill grinding aid shall be added according to the amount specified in the national standard. In the general cement production process, the addition amount of grinding aid shall not exceed 1%.
The proportion of grinding aid for other materials can be queried through the provisions of the national standard. The above are the common problems that lead to the substandard output of LM vertical roller mill. In addition, there are many reasons for the low output of LM vertical roller mill.
Finding and solving the problems in time is one of the ways to improve the grinding output of LM vertical roller mill. In addition, completing various operations and daily maintenance of LM vertical roller mill in strict accordance with the design requirements of LM vertical roller mill is also an effective way to ensure the grinding output of LM vertical roller mill.
If the ventilation effect of silica sand mill is not good, the water vapor cannot be discharged in time, and the water vapor will adhere to the silica sand mill liner and steel ball, resulting in ball paste or grinding.
Therefore, it is necessary to control the ventilation volume of silica sand mill.The passing effect in silica sand mill is good.It can not only bring out qualified fine materials in time, but also effectively reduce the phenomenon of over crushing and reduce the temperature of silica sand mill.
Finding and solving the problems in time is one of the ways to improve the grinding output of vertical roller mill operation.
In addition, completing various operations and daily maintenance of vertical roller mill operation in strict accordance with the design requirements of vertical roller mill operation is also an effective way to ensure the grinding output of vertical roller mill operation.
However, vertical roller mill operation grinding aid shall be added according to the amount specified in the national standard.
Generally, in the process of cement production, the amount of grinding aid shall not exceed 1%. The proportion of grinding aid for other materials can be queried through the provisions of the national standard.
Raymond mill operation criterion 2: large sand return refers to coarse-grained particles returned by the grading equipment to Raymond mill for regrinding during closed-circuit grinding.
Generally, the return ore volume is often several times more than the original feed ore volume. We call the ratio between the return sand volume and the raw ore volume as the return sand ratio.
The "large sand return" here requires us to maintain the "ideal sand return ratio" during Raymond mill operation. Practice has proved that the return sand ratio will directly affect the production efficiency of Raymond mill.
When the return sand is large, the increase of Raymond Mill total ore feeding accelerates the discharge speed of Raymond mill, shortens the residence time of ore in the cylinder and speeds up the circulation.
The main contents of the inspection are as follows: 1. There are no sundries inside Raymond mill cylinder.
2. The fastening of Raymond mill and the connecting bolts are tightened.
3. The rotating parts shall not collide with other objects.
4. Heating and cooling, main bearing cooling water system, no water leakage.
5. There is no oil leakage in the lubrication station.
It is necessary to inject sufficient grease into the sealing ring cavity of Raymond mill main bearing to ensure the lubrication of the main bearing.
(1) cancel the deceleration link of the reducer: reduce the intermediate transmission link, improve the equipment operation rate and reduce the equipment operation cost, and has the advantages of low noise and improving the on-site environment
(2) Large starting torque: stable starting, with a starting torque multiple of more than 1.8.
(3) High efficiency and energy saving: the motor efficiency reaches the level I energy consumption(IE4) standard, and the comprehensive power saving rate reaches 10 ~ 40%
(4) Variable frequency speed regulation: the speed can be adjusted according to the on-site working conditions to make the equipment reach a good running state
(5) Vector control technology: small starting current, no impact on power grid and equipment
(6) High power factor: the power factor reaches 0.94 ~ 0.99, which reduces the loss of power supply line and improves the service efficiency of transformer
(7) Small size: small floor area, convenient installation and increasing the distance of safety passage.
In the concentrator, the technicians chose barite ore grinding plant gear lubrication at random, and did not choose to use it respectively according to the different service characteristics and effects of different lubricating oils, nor did they choose the lubricating oil correctly according to the actual use situation on site.
This will lead to the insufficient viscosity of the lubricating oil during the operation of barite ore grinding plant gear, which can not effectively form a protective oil film, resulting in the wear of barite ore grinding plant gear.
In addition, there are still a few concentrators that use inferior lubricating oil as good, and use waste diesel oil as lubricating oil, which not only can not play the role of lubrication, but also accelerate the wear of barite ore grinding plant.
If the pinion surface is found to be rough, it can be polished manually to reduce the roughness of the gear surface; If the big gear is seriously worn, due to its high cost, it can be repaired or turned over to continue to use, which can not only prolong the service time, but also reduce the investment of the big gear.
In this regard, SBM will configure corresponding vertical roller mill gears according to the needs and requirements of users, and adopt international well-known brands for supporting manufacturing, which can not only effectively ensure the efficient and stable operation of vertical roller mill, but also greatly reduce various problems of vertical roller mill.
The diagnosis is mainly to compare various symptoms and standards of the vertical roller mill in operation to judge whether the vertical roller mill is in normal operation, so as to find out the causes and eliminate the problems in time before the failure, or predict the operation state of the vertical roller mill according to some symptoms and find the corresponding relationship between performance change and structure change, To make scientific judgments and decisions in order to prevent accidents.
Vertical roller mill diagnosis results and treatment methods for the fault diagnosis of vertical roller mill equipment, many faults will have omens before they occur, such as vertical roller mill sound change, vertical roller mill amplitude change, vertical roller mill temperature change, etc.
It is necessary to check the pressurizing device and replace the indenter in time to reset it; When it is found that the vibration sense of the vertical roller mill is strong, it is mostly caused by poor infrastructure, large steel blocks or large hard materials in the vertical roller mill, damage to transmission gears and bearings, etc.
After the problem is diagnosed, appropriate treatment measures can be taken. When it is found that the foundation of the vertical roller mill sinks locally, it is mainly caused by the uneven foundation construction, so it is necessary to stop the machine for treatment and add cushions to make it reach the level; When the vibration of the vertical roller mill often intensifies suddenly, the current changes little with impact sound, and the current increases.
The temperature in Raymond Mill cabin is too high, mainly because a lot of friction and pressure are required to grind materials during milling, so how to reduce friction is the top priority. Zenith suggests that customers regularly add high-performance lubricating oil to bearings, grinding rollers and other parts, which not only solves the problem of friction heating, but also increases the flexibility of various parts and improves the production capacity of Raymond mill.
Pay attention to ventilation. The external air can be removed at the dust removal position to make the external air flow convection with the air flow in the cabin, so as to slowly reduce the temperature in the mill room. If necessary, a high-power exhaust fan can be installed for indoor cooling.
Due to the equipment itself, for example, the equipment quality is not qualified, which requires users to carefully select large brand and high-quality equipment, such as Zenith barite ore grinding plant. In fact, normal maintenance is also very important, so Zenith suggests that you carry out regular maintenance on barite ore grinding plant to prolong the service life of the equipment.
Zenith specializes in producing Raymond Mill powder machine for more than 20 years, continuously introduces advanced technology at home and abroad, improves and develops barite ore grinding plant, and strives to provide customers with reasonable barite ore grinding plant equipment.
Slurry is easy to be thrown out at the outlet of the ore milling plant.During normal operation of the ore milling plant, slurry flows out of the outlet sundry pipe and is mixed with small stones.
The water material ratio in the ore milling plant is out of regulation, and the amount of water flowing through the cylinder of the ore milling plant is an important parameter in operation, and its size reflects the carrying capacity of solid particles in the ore milling plant.
The water flowing through the cylinder of the LM vertical roller mill is mainly composed of the carrying water and the underflow of the cyclone.
Under normal conditions, the bottom water flow of the hydrocyclone generally remains unchanged, but the premise is to ensure that the bottom flow sand setting nozzle of the hydrocyclone is free of wear.
When the bottom flow sand setting nozzle of the hydrocyclone is worn, the working conditions of the hydrocyclone itself change, which will increase the bottom water flow of the hydrocyclone and reduce the top flow overflow, resulting in an increase in the water entering the LM vertical roller mill.
In order to ensure the stable and efficient operation of the equipment, in addition to selecting the type of equipment in line with the beneficiation process, daily maintenance and repair are particularly important.
Therefore, it is recommended that the mine owners consult the equipment manufacturers with the qualification of the overall concentrator when selecting the vertical roller mill, and select the equipment suitable for their own process flow, so as to fundamentally ensure the production efficiency and economic benefits of the whole concentrator.
When some fine dust enters The Bearing Seat Of Raymond Mill running at high speed, the lubricating oil in the bearing seat will deteriorate and the quality will deteriorate, resulting in the wear of Raymond mill bearing.
When the Raymond mill bearing runs in the worn state, it will increase the friction and heat, resulting in an increase in the temperature of the Raymond mill bearing.
Solution: the Raymond mill bearing is worn due to lubricating oil, so it is necessary to clean the Raymond mill bearing housing and bearing during maintenance, and check and dredge the refueling pipeline; Ensure that different types of grease are not mixed; If the lubricating oil of other models is replaced, the original lubricating oil shall be cleaned and replaced.
Note: moisture proof and dust-proof measures shall be taken for grease storage, and lubricants of the same brand and model shall be selected as far as possible.
During the operation of vertical roller mill, the problem of excessive bearing temperature is not only due to the reasons mentioned in the appeal, but also due to poor bearing quality or improper bearing selection.
In order to solve the problem that the temperature of vertical roller mill is too high, in addition to finding and solving problems in time, attention should also be paid to the purchase and selection.
It is recommended to choose a reliable and reputable manufacturer in order to improve the operation efficiency of vertical roller mill.
After the lining of cement raw material milling is worn to a certain extent, the content product of cement raw material milling will increase due to the decrease of lining plate thickness, which will reduce the output, resulting in the discharge and stone discharge of cement raw material milling.
In order to maintain a reasonable filling rate and ensure the output of cement raw material milling, it is necessary to increase the steel ball quantity of cement raw material milling, generally 5% ~ 15%.
In addition, when replacing the lining plate in the later stage, the steel balls shall be screened, and the broken steel balls and small-diameter steel balls shall be cleaned in time.
The commissioning of calcite grinder milling plant machine is of great significance to the grinding stage and the whole concentrator.
By observing and analyzing the commissioning and operation of the calcite grinder milling plant machine, on the one hand, it can test whether the newly installed calcite grinder milling plant machine can operate normally.
Different ores have different properties and hardness, and the corresponding grinding process should also be different. For example, fluorite, tin ore and other ores that are easy to be crushed are different from other ores.
Attention should be paid to over grinding in ball milling. The coarser the grinding particle size, the longer the time required for grinding to the separation stage, and the greater the loss of grinding equipment.
At present, more crushing and less grinding is one of the main principles of concentrator design and production. For ores of the same nature, the higher the content of fine particles in the grinding products, the higher the grinding efficiency.
Although the production efficiency of barite grinding equipment is very high, for all users, it is necessary to understand the basic properties of grinding raw materials before purchasing, and have a detailed understanding of the hardness, humidity and water content of raw materials, and then purchase according to the statistics of these elements, so as to purchase purposefully, To buy a high-quality barite grinding mill in a short time and reduce the chance of being cheated.
When purchasing barite grinding mill, you must find professional well-known manufacturers, so that the product quality produced by such manufacturers will be more guaranteed.
In reality, many users only pay attention to the price of the equipment and blindly crave for cheap.
During the operation of the LUM ultrafine vertical mill, it is necessary to ensure uniform ore feeding. The so-called uniform ore feeding means that the number of ore feeding is stable and the particle size composition of the ore feeding remains unchanged.
So how important is the uniformity of the LUM ultrafine vertical mill? If the ore is not fed in proportion, if the feeding amount is appropriately increased, the grain size of the mill product will become coarser and the amount of returned sand will increase.
The stress in the working process of the belt will increase significantly, even exceed the allowable stress of the shaft, which will directly lead to the destruction of the shaft. Therefore, the tension of V-belt needs to be adjusted in time.
It is suggested that the tension of V-belt should be reduced as much as possible on the premise of ensuring normal transmission. Of course, this phenomenon can be avoided by changing to flexible connection.
Check the vibrator regularly to prevent the vibrator from sliding; Select lubricating oil with high viscosity to reduce oil rejection. The service life of vertical roller mill surface is short, and the main factors affecting the aging of screen surface are screen surface structure, material and tightness.
At present, many vertical roller mills use polyurethane screen surface. Reasons and Countermeasures: on the one hand, the anti-aging property of polyurethane itself is not high.
On the other hand, if the staff do not tighten the screen surface when installing the screen surface, that is, when installing the screen surface, only both sides of the screen surface are fixed and the middle is not fixed, the screen surface and bracket will collide and rub up and down continuously during operation.
Different types of vertical roller mill feed ports are different, and their model size also determines the size of the feed port, which requires the vertical roller mill manufacturer to produce according to the particle size of the material to be milled by the concentrator.
If the content of coarse particles (large dry outlet size) in the feed is high, the required milling is relatively large, which will affect the productivity and cause blockage to a certain extent; When the content of fine particles (close to or less than the outlet size) is large, the milling to be realized is relatively small, so its productivity will be improved accordingly.
Generally, vertical roller mill is often used as primary mill, while counterattack vertical roller mill, conical vertical roller mill and hammer vertical roller mill are used as secondary mill or even tertiary mill.
Consider the impact of material water content on milling productivity. When the water content is too large, fine-grained materials will agglomerate or stick to coarse-grained materials due to the increase of humidity, so as to increase the viscosity of materials.
When a certain viscosity is reached, the materials will be bonded in the vertical roller mill inlet and milling chamber, which greatly reduces the ore discharge speed, aggravates the blockage of inlet and outlet, and reduces the productivity.
Ore milling plant is a heavy-duty equipment. It is started with heavy load. During operation, the load is heavy and there is impact load. Therefore, special attention should be paid to two aspects when selecting rolling bearings:
(1) Load selection of bearing. If the selected bearing has low rated load and serious bearing wear during operation, it will cause bearing heating and shorten service life.
(2) Selection of bearing clearance. Too small clearance is not conducive to the formation of oil film and the elimination of thermal expansion. Especially when the ambient temperature is high, too small original radial clearance will make the clearance of the bearing smaller or even zero due to the expansion of temperature rise during operation, which is easy to cause bearing heating.
The alignment of the coupling shall be in accordance with the requirements of the general code for construction and acceptance of mechanical equipment installation engineering (gb50231-2009), determine the maximum allowable value of radial displacement and inclination according to the diameter of the coupling, and correct it according to this value.
During installation, the free end bearing does not leave enough thermal expansion, so that this end bearing cannot extend freely during operation, resulting in the bearing bearing bearing large axial force, heating and even burning out.
Whether the grinding particle size is qualified or not directly affects the subsequent beneficiation operation, and the qualified rate of grinding particle size is closely related to the feeding particle size. The relationship between feeding particle size and ultrafine vertical mill is introduced below.
When the fineness requirements of grinding products are the same and the feeding particle size is large, the production capacity of ultrafine vertical mill is low; If the feeding particle size is small, the production capacity of ultrafine vertical mill is high.
It can not only achieve the purpose of washing and classification, but also remove some impurities, which has good application value. However, it is difficult to obtain qualified silica sand products by gravity separation, and the final qualified products still need to be obtained by magnetic separation, flotation, calcination and other methods.
Silica sand grinding mill almost all silica sand raw ores contain a small amount of iron minerals, generally 0.5% - 3%, mainly including colored impurities such as magnetite, ilmenite, siderite and pyrite.
However, the disadvantage of roasting purification is high energy consumption and easy to cause environmental pollution.
It is difficult to obtain high-grade calcite grinder milling plant machines only through a single process.
Therefore, in the actual production, it is recommended that the mine owners select qualified manufacturers for beneficiation test, and adopt a combination of multiple processes to improve the product quality of calcite.
This shows that the grindability of raw ore will directly affect the grinding efficiency of ore milling plant.
Therefore, in production, when the raw ore is difficult to grind and the particle size is required to be fine, we can take certain measures to enhance the grindability of the raw ore under the condition of economy and site permission, such as adding chemicals in the grinding process to increase the grinding efficiency; Or work hard on the grindability of raw ore: heating minerals in raw ore, reducing hardness, etc.
In production practice, the grinding concentration is controlled by controlling the ore feeding amount of vertical roller mill, the replenishment amount of vertical roller mill, or adjusting and controlling the particle size composition and water content in graded return sand, so as to help improve the grinding efficiency of vertical roller mill.
Optimize the grinding process according to the ore properties of the raw ore (embedded particle size of useful minerals, monomer dissociation degree, embedded particle size of gangue minerals), such as pre tailing, pre enrichment, stage grinding and pre classification.
So, what are the common failures of LUM ultrafine vertical mill in daily operation? How can we solve these failures? This article starts with five common faults and analyzes their causes and countermeasures.
Large fluctuations in the feed pressure During the production process, the feed pressure will affect the processing capacity and grading particle size of the LUM ultrafine vertical mill.
If the underflow is discharged in an "umbrella shape", but the underflow concentration is less than the production required concentration, it may be caused by the low feed concentration. At this time, the feed concentration should be increased.
The "fine underflow clamp" may be caused by the underflow orifice wear, the underflow orifice is too large, the overflow pipe diameter is too small, the pressure is too high or too low, it is necessary to adjust the pressure first, and then check whether the underflow orifice is worn or replaced A small underflow port is gradually adjusted to normal production state.
The grit angle is between 10°-20°, and the concentration reaches about 75%, which is ideal for aggregate crushing value conclusion.
If the grit nozzle is spray-like, the spreading angle of grit is too large, indicating that the size of the grit nozzle is too large.
If the grit nozzle is in a rope shape, it may be because the concentration of the ore feed is too high, the size of the grit nozzle is too small, the grit nozzle is partially blocked or the slurry density is too low. When the grit nozzle is spray-like, it can be adjusted by replacing the small grit nozzle.
Before the initial operation, the high-pressure and low-pressure lubrication device shall be started, and the high-pressure system shall float the cylinder to ensure the production of oil film with sufficient strength.
At the same time, cooling water shall be opened for bearing cooling. After the inspection, the barite ore grinding plant commissioning can be carried out.
Generally, the barite ore grinding plant commissioning is divided into no-load commissioning and load commissioning.
After the barite ore grinding plant idles for the specified time, stop the barite ore grinding plant, carefully check all working parts, tighten the lining plate bolts and eliminate the defects found. After there is no problem with the barite ore grinding plant idling, the load test run can be carried out.
Clean up sundries inside the barite ore grinding plant and ensure that rotating parts do not collide with each other. There are good protective measures for the inlet and outlet shafts of each coupling.
After starting the barite ore grinding plant, ensure that there are no people standing on both sides of the equipment. Carefully check the cooling system of high-low lubrication station and main bearing, and ensure normal operation through test.
In the cylinder, the materials are crushed due to the throwing impact and self grinding of the steel ball and the ore itself. Due to the continuous feeding of materials, the pressure causes the materials in the cylinder to move from the feeding end to the discharge end, and the materials reaching the particle size of finished products are discharged from the discharge end of the cylinder.
Friction is greatly reduced, easy to start and significant energy saving; The discharge end adopts conical design, and the materials and steel balls at the discharge end are graded, which not only increases the volume, but also forces the cone closer to the discharge port and the smaller the diameter of the steel ball, increasing the effect of repeated grinding;
Secondly, there are many different forms of cement raw material milling liner, which can be used to adjust the motion state of grinding medium in the cylinder to enhance the grinding effect of grinding medium on materials and improve the grinding efficiency.
Material and application of cement raw material milling lining plate the materials of cement raw material milling lining plate mainly include high manganese steel, alloy steel, hard steel, chromium steel, alloy cast iron, magnetic lining plate, rubber lining plate, etc.
First, the function of cement raw material milling lining plate is to protect the cement raw material milling cylinder from direct impact and friction by grinding medium and materials.
Secondly, there are many different forms of cement raw material milling liner, which can be used to adjust the motion state of grinding medium in the cylinder to enhance the grinding effect of grinding medium on materials and improve the grinding efficiency.
However, high manganese steel lining plate is rarely used now. Although it has sufficient impact toughness, cold hardening of the surface when subjected to a certain impact, it is more hard and wear-resistant, its processing technology requirements are very high and the price is expensive.
The gradation ratio of limestone grinding mill steel balls in common economical operating conditions: steel ball diameter mmΦ100Φ80Φ60Φ40Φ20 mass/total loading 7.5% 6.9% 33.5% 30.1% 22 Note: When the easy grinding performance of the material is poor, or the grinding requirements are relatively fine , the fill rate of a bin should be >28%.
The temperature of the material entering the limestone grinding mill is too high. Generally, when the temperature of the material entering the limestone grinding mill is too high, it is easy to reduce the grinding efficiency. When the temperature of the limestone grinding mill exceeds 100 °C, an air film isolated from each other on the surface of the small particles of the material will be damaged. damage, causing adhesion.
Especially in recent years, the development of my country's chemical, cement and other industrial raw material industries has prompted the continuous improvement of calcite mills and is widely used in various industrial production.
Calcite is used as a flux in the metallurgical industry, and is used in the construction industry to produce cement and lime. Filling additives in plastics, paper, toothpaste and food. If calcite is added to the glass production, the resulting glass will become translucent, especially suitable for making glass lampshades.
Quartz stone is generally processed into powder and is used more, and a quartz ultrafine vertical mill is required. With the development of the industry, the demand for ultra-fine powder is getting higher and higher, and the machine that can grind the ore into 1000 mesh is also more common. So what is the output of the 1000-mesh quartz ultrafine vertical mill per hour? How much is it? Let's introduce it in detail.
The 1000-mesh quartz ultrafine vertical mill recommends ultra-fine mill. It is a new generation of mill. It has been upgraded in terms of output, finished product fineness, performance, etc., which can bring you uniform fineness and large output. It is more guaranteed to choose 1000 mesh quartz stone powder for fine processing of quartz stone powder.
ultrafine vertical mill: https://www.oremillingplant.com/grinding-mill/lum-vertical-roller-mill.html
The vertical roller mill hydraulic system is a rotary cylinder with hollow shafts at both ends, and a considerable number of steel rods and steel balls are installed in the cylinder. When ore and water are fed into the cylinder from the hollow shaft at one end, and discharged from the hollow shaft at the other end.
When the vertical roller mill cylinder rotates at a specified speed, the steel balls and steel rods are together with the ore. Under the action of centrifugal force and frictional force, they rise to a certain height with the cylinder, and then they are thrown away from the cylinder wall and slide down.
Then they rise to the same height with the cylinder, and then fall down, periodically, so that the ore is crushed by impact and grinding. The ground ore and water form ore slurry (wet grinding), which is discharged from the hollow shaft at the discharge end to complete the grinding operation.
The large gear and the pinion should be aligned according to the instructions. The sector block of the lower bearing seat, the bottom plate of the pinion, the bottom frame of the main gear and the bottom frame of the motor are completely grouted, and the grouting strength meets the design strength requirements.
All anchor bolts, connecting bolts and main gear pressing bolts should be tightened. The fixing bolts of the large gear should be tightened according to the specified torque. The bearing bush should be installed on the fan-shaped block of the bearing seat according to the rotation direction of the vertical roller mill;
The bearing bush should be corrected according to the axial guide ring;
The bearing seat seal is installed correctly, and the joint point is sealed with sealant. All lubricating points of the vertical roller mill are given sufficient amount according to the lubrication requirements;
Connect the reducer and the pinion coupling, install the protective cover, start the lubricating oil system and the cooling water system. Turn on the power of the dolomite powder machine, after the rotation is normal, press the accident button to stop, and check the main bearing, motor, and gears to determine whether the dolomite powder machine rotates in the correct direction.
If there is no abnormality, start the dolomite powder machine to run for 8 hours. During the trial operation, check the heat generation of the dolomite powder machine bearing seal, the lubricating oil temperature and pressure, and the temperature should be controlled between 40-50 °C. If there is any abnormality, stop cooling immediately.
During the test run of the dolomite powder machine under load, according to the proportion of the dolomite powder machine, a certain amount of steel balls are added to the barrel of the dolomite powder machine, and the steel balls are added in batches. During the operation process, the bearing temperature, current, and vibration intensity are measured.
After the dolomite powder machine is installed, start running with load, add 70% of the specified load to the grinding material, and continue to run for more than 10 hours. During the process, the threaded joints of the dolomite powder machine lining should be tightened and the threaded connections should be checked frequently to prevent loosening.
It is directly related to the overall processing capacity of the concentrator and has a significant impact on the economic and technical indicators of the entire concentrator. Therefore, ensuring that the output of the bentonite milling machine meets the standard is the top priority.
In the production of the dressing plant, it is a very common problem that the output of the bentonite milling machine fails to meet the design requirements. Then, under what circumstances will the output of the bentonite milling machine fail to meet the standard?
Unreasonable design of the length ratio of each bin of the bentonite milling machine. The unreasonable length ratio of each bin of the bentonite milling machine will cause the imbalance of the coarse and fine grinding capabilities of the bentonite milling machine, resulting in the phenomenon of over-coarse or over-fine products, which will affect the output.
The gradation ratio of bentonite milling machine steel balls in common economical operating conditions: steel ball diameter mmΦ100Φ80Φ60Φ40Φ20 mass/total loading 7.5% 6.9% 33.5% 30.1% 22 Note: When the easy grinding performance of the material is poor, or the grinding requirements are relatively fine , the fill rate of a bin should be >28%.
The temperature of the material entering the bentonite milling machine is too high. Generally, when the temperature of the material entering the bentonite milling machine is too high, it is easy to reduce the grinding efficiency. When the temperature of the bentonite milling machine exceeds 100 °C, an air film isolated from each other on the surface of the small particles of the material will be damaged. damage, causing adhesion.
In addition, it is also related to the steel balls of the mini cement plant. The size of the steel balls and the number of steel balls will affect the service life of the mini cement plant liner. If the mini cement plant is in operation, increasing the amount of steel balls or filling steel balls with larger diameters will increase the wear of the mini cement plant liner.
Countermeasures: Reasonable selection of the mini cement plant liner and steel balls is one of the main ways to reduce the excessive wear of the liner. First, the relevant staff need to know the ratio of the mini cement plant liner to the steel ball, and select the corresponding steel ball size and quantity according to the ratio.
Under normal circumstances, the hardness ratio of the liner of the conventional mini cement plant to the steel ball is about 1:0.8. Second, it is necessary to control the ratio of materials and steel balls, and it is advisable that the material is twice that of the steel balls.
Third, when choosing a mini cement plant, it is necessary to select the appropriate mini cement plant liner according to the type of minerals, control the hardness of the mini cement plant liner and the steel ball, and make a reasonable match between the steel ball and the liner.
If the mini cement plant is running at a low load, the steel balls will directly impact the liner, causing serious wear and even breakage of the mini cement plant liner. Countermeasures: Relevant staff need to understand the operation status of the mini cement plant and control the operation status of the mini cement plant.
When the mini cement plant is running under a low load state, it is necessary to adjust the ore input of the mini cement plant in time to ensure the grindability of the material. In addition to the four wear reasons described above, the design, manufacture and installation of the mini cement plant liner are also one of the reasons that affect the rapid wear of the mini cement plant liner.
It is required to have a record of the complete installation process and to pass the acceptance inspection;
The strength of the basic concrete of the equipment and the strength of the secondary grouting concrete must reach the strength level required by the design;
The PLC control system, thermometer and pressure gauge of the dolomite powder machine can be reliably put into operation;
The dolomite powder machine is equipped with equipment for installation Completed, the grinding workshop system is complete;
The surrounding environment of the equipment is free of garbage and debris, and the scaffolding is removed;
Ensure that the water power, electricity, and communication facilities are complete;
Explosive materials, and equipped with corresponding fire-fighting facilities to prevent accidents;
Ensure that the amount of lubricant used during the operation of the dolomite powder machine is sufficient;
So how to effectively solve or avoid the failure of the mini cement plant is an effective way to improve the efficiency of the mini cement plant. We have sorted out some common faults and spare parts faults of mini cement plants.
Today, the editor continues to sort out some sudden failures and solutions of mini cement plants for you. The sudden failure of the mini cement plant is generally caused by multiple reasons such as long-term high-speed operation, job responsibility and improper operation.
The stator coil of the mini cement plant is broken down in the whole system of the mini cement plant. There will be iron-containing dust in the air around the material. After a long time of operation, the iron-containing dust will adhere to the coil of the mini cement plant stator. Thickness will cause short-circuit discharge on the surface of the stator coil. When a short circuit occurs for many times, the insulator of the coil will be damaged, resulting in the phenomenon of ignition breakdown, which will cause the mini cement plant to stop running.
In the absence of a backup motor, it is difficult to continue the grinding work. So we can correlate this fault with the lack of cylinders in the car and find a solution. At this time, the breakdown coil should be cut off immediately, and scientific protection measures should be adopted, and the mini cement plant should be started again to continue production.
Experience, let's briefly talk about how to deal with the problem of too much sludge in the slurry in the operation of the limestone grinding process.
Reduce and prevent the formation of ore slime: Multi-stage grinding process and stage beneficiation process can be used. It is necessary to correctly select the grinding and classification equipment to improve the efficiency of the classifier.
The structure and working principle of the calcium carbonate mill Generally, the structural components of the calcium carbonate mill mainly include the feeding part, the discharging part, the main bearing part, the cylinder part, the transmission part, the base part, the main motor, the jacking device and the electric control box etc, these components make up a complete calcium carbonate mill.
At present, grid type calcium carbonate mill and overflow type calcium carbonate mill are more common types. These two calcium carbonate mills are mainly composed of working structure and transmission structure.
Before installing the base, be sure to analyze the base of the ultrafine vertical mill in detail, and check whether it meets the relevant design requirements. Observe whether the main bearing chassis of the ultrafine vertical mill is on the center line, whether its coincidence exceeds 0.5mm, and the feed end should usually be about 1mm higher than the discharge end.
In addition, after the elevation bolts are tightened, the theodolite can be used to test the chassis to see if it is on the same level as the chassis.
Therefore, in order to prevent and eliminate hidden dangers and ensure that the vertical roller mill is in good condition for a long time before the wear and tear of the various parts of the vertical roller mill has not reached the production efficiency, the vertical roller mill should be regularly maintained and maintained.
The maintenance and maintenance of the vertical roller mill is a routine operation, which can be combined with the maintenance of the vertical roller mill. Full-time personnel are required to carry out daily inspection, lubrication inspection and daily cleaning operations.
Vertical roller mill lubrication replacement requirements table serial number lubrication point lubrication method lubricating oil standard number oil change period 1 main bearing splash lubrication Winter: 46 # mechanical oil summer: 68 # mechanical oil 6-12 months 2 vertical roller mill size gear oil pool splash lubrication 220 # heavy Load industrial gear oil 6-12 months 3 reducer gears and bearings splash lubrication 18 # hyperbolic gear oil 6-12 months 4 motor bearing oil gun 3 # ordinary lithium grease 6-12 months 5 pinion bearing oil gun 3# Ordinary lithium base grease 6-12 months inspection content: 1.
Regularly observe the oil pressure gauge, generally the normal oil pressure is maintained at 0.05-0.15MPa, if the oil pressure difference before and after the filter cooler exceeds 0.04MPa , the filter needs to be cleaned in time.
In addition, if the parking time is long in winter, the three-way cock at the water inlet of the main bearing can be turned to the waterproof position, and the siphon action can be used to discharge the accumulated water in the spherical tile through the water channel, so as to avoid freezing and cracking of the spherical tile or the bearing seat.
The daily cleaning of the ultrafine vertical mill is mainly to prevent the ultrafine vertical mill from corroding, rusting, or even causing blockage and wear due to impurities, which in turn affects the daily production of the ultrafine vertical mill.
Therefore, it is necessary to maintain the "daily hygiene" of the ultrafine vertical mill equipment at all times to ensure that the operation room or machine room is free from dust accumulation, parts, materials and tools are stored neatly.
Unexpectedly, there is no air at the outlet of the air extractor.What causes the "full grinding" of the vertical roller mill? Sudden increase of the feeding amount makes the grinding capacity of the steel balls unable to adapt to the increased feeding amount in time.
The properties of the grinding material change, such as the particle size becomes larger, the hardness becomes larger, etc. If the feeding amount is not reduced in time, a large number of unqualified materials will be caught in the gaps of the partition board, resulting in blockage, so that the materials cannot be discharged in time.
Always observe whether the current of the main motor of the ultrafine vertical mill increases. If the current increases, it means that the "full grinding" phenomenon of the ultrafine vertical mill has been eliminated, and the feeding amount can be gradually increased.
Stop the machine to check the compartment board and grate board. If the above methods do not work, the method of stopping and grinding can be adopted. Empty all the steel balls and materials in the barrel of the ultrafine vertical mill, and at the same time clean the attached materials on the liner and steel balls, then reload the balls and start the operation.
Start the inspection to confirm that the belt is running in the correct direction (the correct direction is clockwise when looking down). Make sure that the belt is free of scratches, and then officially start. If the above problems occur during the operation of the grinding mill, the belt should be removed, and the stirring parts should be disconnected for separate investigation.
The routine inspection part is the motor, the verticality of the motor shaft should be checked, the structure between the motor and the plate, the plate and the bracket is in good condition, the motor can be tested separately for wiring, and the small pulley can be visually checked to see if the operation is stable.
Influenced by factors such as lubrication, if necessary, please ask professional motor maintenance personnel to carry out maintenance.
Water seepage and leakage have no effect on the use of the equipment, but have a greater impact on the environment. Troubleshooting and troubleshooting: The surface connection of the tank body must ensure that the rubber is complete and free of deformation.
Fill the flange surface with sealant to seal, strengthen the seal, and pre-tighten the bolts after the joint surface is well connected. If it is found that the gap of the connected tank body leaks, first check whether the bolts are loose and whether the rubber is damaged. Try loosening the preload bolts, refill the sealant if the bolts and rubber or maintenance interval, and then preload the bolts.
The rubber is glued to the back of the gate. It is necessary to ensure that the rubber is firmly bonded and the surface is flat. Install the gate when it is fully dry. The special screws are designed according to the selection and structural dimensions.
After pre-tightening, the natural pre-tightening force between the gate and the U-shaped plate of the tank body should meet the design requirements, and no adjustment should be made unless there are special circumstances, otherwise the pre-tightening is too loose or excessive.
Tightening may lead to running water, and the lifting is not smooth. The above are the common mechanical failures of mechanical kaolin milling equipments. In actual production, attention should be paid to the maintenance and maintenance awareness of the kaolin milling equipment.
Solution: It is necessary to regularly add oil to the bearing box according to the requirements of equipment use to avoid too much or too little oil. If there is a problem with the oil quality, it is necessary to clean, replace the oil and seal in time.
After long-term operation, some parts of the ultrafine mill may be severely worn or even broken. Common wear and tear parts include spring springs, bearings, pipe beams, beams and screen frames. The spring should be an important part of the ultrafine mill for shock absorption and noise reduction.
If the spring is worn or broken, it will not only produce a large noise, but also cause disorder on the screen. Solution: The spring should be replaced in time to prevent production accidents.
2. The output can reach 615 tons per hour, and the phenomenon of calcium stone blocking the feeding port will not occur during the grinding process, which improves the grinding capacity and output of the equipment.
3. The output range of vertical roller mill is still very large, the output of small equipment is 0.65 tons per hour, and the output of large equipment is 615 tons. Equipment with different output not only differs in the amount of raw materials used, but also the structure design of large equipment is more complicated, so their prices There is definitely a big difference, and different manufacturers have different cost inputs and different pricing. We need to compare and choose equipment with high cost performance when purchasing.
For multi-chamber bag-type ultrafine vertical mills, the method of off-line cleaning by separate chambers is often used. at this time, although the actual total filtration area of the ultrafine vertical mill is reduced, the pressure loss will increase slightly. when the cleaning is finished and the work is resumed, because the impedance of the bag chamber for cleaning has dropped and the air volume passing through it has increased, the total air volume of the reverse-blow bag ultrafine vertical mill will increase after cleaning, compared with before cleaning, and the pressure loss will increase. will drop.
The dust-removing effect of the back-flushing bag-type ultrafine vertical mill is relatively weak, so the filter cloth is generally recommended to use a lighter woven cloth [300-450g/㎡], which is rich in softness and has a small size change.
when the direction of the force is the same as the pressing direction, it becomes the pressing force, and when it is opposite, it becomes the loosening force. the cover air tightness effect plays the opposite role. therefore, setting the closing direction of the cover plate correctly and making full use of the pressure difference existing in the system to positively press the cover plate can achieve a good leakage prevention effect.
The selection of dust removal bag is very important, it directly affects the dust removal effect of ultrafine vertical mill. the selection of dust removal bag is selected from the following aspects: gas temperature, humidity and chemical properties, particle size, dust concentration, filtering wind speed, dust removal method and other factors. in pulsed and airbox pulsed ultrafine vertical mills, dust is attached to the outer surface of the bag.
Kaolin is mainly used in paper making, ceramics and refractory materials, followed by coating, rubber filler, enamel glaze and white cement raw materials, and a small amount is used in plastics, grinding wheels, daily cosmetics, medicine, textiles, petroleum, chemical industry, building materials, national defense and other industrial sectors. With the rapid development of modern science and technology, some high-tech fields began to use a large amount of kaolin as a new material, as well as high temperature resistant porcelain parts of atomic reactors, space shuttles and spaceships, also made of kaolin.
The continued popularity of the kaolin sales market has led many regions with high-quality kaolin resources to encourage local enterprises to invest in the kaolin mining and processing industry. At present, all applications of kaolin must be grinded into fine powder before it can be added to other materials for complete fusion. At present, the equipment for processing the fine kaolin powder below 400 meshes are R Raymond mill, high pressure medium speed mill, overpressure V mill, etc., which can process the raw kaolin ore into 80-400 meshes of different specifications.
The complete configuration of the kaolin mill includes jaw crusher, bucket elevator, vibrating feeder, main machine of the mill, classifier, powder collector, pulse dedusting system, air compressor, electrical control system and the corresponding supporting grinding equipment of the mill. Collirick kaolin mill has a unique crushing chamber structure and advanced grading device to ensure that the equipment can achieve ultra-fine powder processing. Especially, it is suitable for processing products with high whiteness requirements, such as kaolin, calcite, calcium lime powder, etc., which are characterized by high whiteness, fine particle size, and no black slag.
Kaolin Processing Equipment
Due to the high industrial value of kaolin and the increasing demand for mining, Shanghai Collirick Machine has launched a full set of kaolin processing equipment, which is mainly composed of hammer crusher, bucket elevator, storage bin, vibrating feeder, Raymond mill, grader, magnetic separator, compressor, electric control system and some conveying equipment; It is applicable to the processing of superfine powder with materials ranging from 3.25 meshes to 3000 meshes.
However, mica can be applied as the mixed material of mica powder processing. The functions are improving capacity, energy saving, cost reducing, and can improve product performance.
The capacity of cement will rise for 10-15% if added with mica, and will rise for 20-30% if added mica and slag. It will also increase corrosion stability.
When producing mica powder, it can take the method of jointly grinding or separately grinding. The feeding mica fineness should be around 0.08mm (200 mesh), much smaller than other material.
Jointly grinding is to send the raw material, gypsum and mica into the mill to be ground together. The technology is simple and easy to operate. The mica will not only assist the grinding, but also help to clean the powder on the wall, which will increase capacity.
The fineness of barite is relatively high when using ultrafine mill, generally the fineness is 300-3250 mesh. The fineness of the mineral powder has a very high activity and significantly expanded range of applications.So it is not only used in the construction industry, but also used in the paint, plastics and rubber industries.
The main component of calcium carbonate’s natural rock calcined at a suitable temperature, after eliminate the decomposition of carbon dioxide, the resulting calcium oxide (CaO) as the main ingredients is lime, also known as barite.
Calcination of calcium carbonate to produce barite is the traditional production process, with the development of science, the production of barite used mechanized, semi-mechanized shaft kiln and rotary kiln, fluidized bed furnace and other equipment.
