Slewing bearing is a kind of large-scale bearing with special structure that can bear large axial load, radial load, overturning moment and other comprehensive loads at the same time. It integrates multiple functions such as support, rotation, transmission, fixation and sealing, corrosion prevention, etc. it is a product with high technology content and high added value, widely used in lifting machinery, engineering machinery, transportation Machinery, mining and metallurgical machinery, medical equipment, as well as ships, radars, wind turbines and other equipment.