During the running process of vertical roller mill, the hydraulic system pressure can not be maintained. Observe the frequent start of high-pressure oil pump and increase of hydraulic oil temperature. This phenomenon is very easy to cause oil pump damage and energy consumption.

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.