The sealing of the grinding roller is to prevent high-concentration dust in the vertical roller mill from entering the grinding roller cavity and to protect the roller bearings from damage. High pressure air is blown into the grinding roller cavity through the sealing machine to form a positive pressure in the grinding roller cavity to prevent The purpose of dust entry.

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.