Slewing ring, also known as slewing bearings or turntable bearing, is a large 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 transmitting parts, between the two objects that require to end up being relative rotary movement. It has the inner and outer band, rolling and other parts.
One can consider the slewing drive as a gearbox because the core motion components will be the slewing bearing and worm shaft. In addition, it consists of auxiliary components such as seals, housing, and motor. As a power resource, slew motor is normally DC planetary gear electric motor or AC gear engine. AC hydraulic engine is mainly used in the construction machinery as a power travel worm gear slew drive system. As the primary component is slewing band drive, slewing gearbox can readily withstand the axial and radial forces. The slew get working principle: The worm is powered by the electric motor, which drives the outer ring of the slewing band to rotate; The external ring output the torque through the flange and the 
inner ring of the slewing band is fixed in the housing.
Slewing drive has invert self-locking due to worm gear drive with reverse self-locking characteristics. This feature significantly enhances the stability of the host operating and safety aspect. Compared to the traditional swing products, slewing drive gearbox is easy to install, simple to maintain, and will save considerable installation space.