Slewing ring, also known as slewing bearings or turntable bearing, is a huge bearing which has the capacity 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 need to be relative rotary motion. It gets the inner and outer band, rolling and other components.
One can consider the slewing drive as a gearbox since the core motion parts are the slewing bearing and worm shaft. It also consists of auxiliary elements such as seals, housing, and engine. As a power resource, slew motor is generally DC planetary gear electric motor or AC gear electric motor. AC hydraulic electric motor is mainly found in the structure machinery as a power travel system. As the primary component is slewing band drive, slewing gearbox can easily endure the axial and radial forces. The slew drive working basic principle: The worm is powered by the electric motor, which drives the outer band of the slewing ring to 
rotate; The outer ring result the torque through the flange and the internal ring of the slewing band is set in the housing.
Slewing drive has reverse self-locking because of worm gear drive with invert self-locking features. This worm gear slew drive feature significantly enhances the balance of the host operating and safety element. When compared to traditional swing products, slewing travel gearbox is easy to install, simple to maintain, and will save considerable installation space.