Mechanical equipment in coal mine production is always surrounded by dust, water vapor and harmful gases, and the working conditions are harsh. Most of the mechanical equipment works under high speed, heavy load, vibration, impact, friction and medium corrosion conditions. . And the running time is long, most of the mechanical equipment works continuously for many years, day and night. Therefore, the annual economic loss is staggering. Only by selecting the correct bearings, performing regular maintenance, timely maintenance, improving the maintenance quality, and ensuring that all production equipment is running in good condition, can the wear and tear of coal mine machinery be reduced and its use extended. Longevity, effective measures to achieve high coal yield, high efficiency and safe production, mining operators can ensure high productivity and make equipment reach the expected service life.