During the use of cement vertical roller mill, due to the bad working conditions, common problems such as wear of vertical mill roll, lining plate of grinding disc, wear of bearing chamber of vertical mill roll and leakage of reducer often occur. In the process of using vertical grinding roller body and wear-resistant liner, once the fit clearance occurs, the wear between the body and liner will be aggravated.

In addition, the continuous erosion of hot air and cement particles on the mating surface will lead to the generation of grooves, resulting in impact collision between the body and liner, and in serious cases, the liner will crack or even break. Crack, machine damage, especially the damage of reducer, cause malignant events. Once this kind of problem occurs, the general repair method is difficult to solve, and the replacement cost is high. The assembly requirements of vertical grinding roller bearings are more stringent.

Enterprises generally adopt the method of cooling the bearings in dry ice to assemble. Once the clearance between the bearing and the bearing chamber occurs, it will affect the normal operation of the bearing, leading to the heating of the bearing, which will lead to the burning of the bearing in serious cases. The leakage of the vertical roller mill reducer not only affects the appearance of the machine, but also wastes oil, causing great trouble to the maintenance of the equipment.