Slewing ring turntable bearings called, some people also call it: the rotary support, maneuver support. English names were called: slewing bearing, slewing ring bearing, turntable bearing, slewing ring. Slewing in real industry which is widely used, known as the: "joint machine", is the need for the relative rotary movement between the two objects, and the need to withstand the axial force, radial force, the mechanical roll moment required important transmission member. With the rapid development of the machinery industry, slewing ring in marine equipment, engineering machinery, light industrial machinery, metallurgical machinery, medical equipment, industrial machinery and other industries has been widely used.
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