If a soft material is added between the cover plate and the main body, under the action of the pressing force, the sealing material will be deformed, filling the wet groove, reducing the air leakage gap, and then playing a sealing role. in addition to the mechanical pressing force, the force generated by the static pressure difference acting on the cover plate uniformly acts on the cover plate.

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.