Mining mechanical equipment is a kind of large-scale mechanical equipment used in mining, conveying and transportation, including mining machine, conveyor, mine roadway driving equipment, Mine Auxiliary Transport, vehicle equipment, mine winch, ventilation and dust removal equipment, coal washing equipment, cranes, special vehicles, etc. . The mechanical equipment in mine production has the following characteristics: 1. The working environment is bad, the equipment is surrounded by dust, water vapor and harmful gas. 2. Operating conditions are harsh, most of the mechanical equipment is in high-speed, heavy-duty, vibration, impact, friction and medium corrosion working conditions; 3. Long running time, most of the machinery and equipment around the clock, year-round continuous operation; 4. Poor lubrication conditions, due to the harsh environment, harsh working conditions, coupled with short downtime, which makes mechanical parts can not get good lubrication and maintenance. Therefore, the annual economic loss caused by a staggering, only by choosing the right bearings, regular maintenance, timely maintenance, improve the quality of maintenance, to ensure that all production equipment in good condition, in order to reduce coal mine machinery wear and tear, only by extending its service life and realizing the effective measures of high-yield, high-efficiency and safe production, can the mining operators ensure the higher productivity and make the equipment reach the expected service life.