Slewing bearing is also called bearing turntable, 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 real industry and are called "joints of machines". They are important transmission components required for machines that require relative rotational motion between two objects and simultaneously bear axial force, radial force, and tilting moment. With the rapid development of the machinery industry, slewing bearings have been widely used in shipbuilding equipment, engineering machinery, light industrial machinery, metallurgical machinery, medical machinery, industrial machinery and other industries.