Slewing ring, also referred to as slewing bearings or turntable bearing, is a big bearing which will be able to maintain the more axial load, radial load and tilting moment. It is referred to as: “machine joints”, the essential machinery transmission parts, between the two objects that need to end up being relative rotary movement. It gets the inner and outer band, rolling and other elements.
You can consider the slewing drive as a gearbox because the core motion components are the slewing bearing and worm shaft. In addition, it consists of auxiliary elements such as for example seals, housing, and engine. As a power source, slew motor is usually DC planetary gear engine or AC gear electric 
motor. AC hydraulic motor is mainly used in the construction machinery as a power get system. As the core component is slewing band get, slewing gearbox can readily withstand the axial and radial forces. The slew travel working principle: The worm is powered by the motor, which drives the external band of the slewing ring to rotate; The external ring output the torque through the flange and the inner ring of the slewing ring is set in the housing.
Slewing drive has reverse worm gear slew drive self-locking because of worm gear drive with invert self-locking characteristics. This feature significantly enhances the stability of the host operating and safety element. Compared to the traditional swing items, slewing drive gearbox is easy to install, simple to maintain, and will save considerable installation space.