The slewing bearing is also called the slewing bearing, and some people also call it: rotating bearing, slewing bearing. The English names are: slewing bearing, slewing ring bearing, turntable bearing, slewing ring. Slewing bearings are widely used in the real industry. They are called “joints of machines”. They are mechanical places that require relative rotational movement between two objects, but also need to bear axial force, radial force, and tilting moment at the same time. An important transmission component necessary. With the rapid development of the machinery industry, slewing bearings have been widely used in marine equipment, engineering machinery, light industry machinery, metallurgical machinery, machinery, industrial machinery and other industries.