Periodically 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.Pay attention to the heating and cooling operation of the mill. Most manufacturers do not pay attention to the heating and cooling operations of ultrafine vertical mills, and fail to realize that reasonable heating and cooling operations can prolong the service life of key large bearings and wear parts.Reasonable heating rate can heat the roller sleeve, liner plate and bearing uniformly, thereby prolonging the service life of the liner plate, roller sleeve and key bearing. Among the spare parts of the mill, the price of these key parts is relatively expensive, and any one of them is damaged. Will directly affect the operation cycle of the mill.