Slewing ring, also called 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 really is known as: “machine joints”, the essential machinery transmitting parts, between the two objects that need to become relative rotary motion. It gets the inner and outer ring, rolling and other components.
One can consider the slewing drive as a gearbox since the core motion elements will be the slewing bearing and worm shaft. In addition, it consists of auxiliary elements such as for example seals, housing, and motor. As a power source, slew motor is usually DC planetary gear motor or AC gear engine. AC hydraulic electric motor is mainly found in the building machinery as a power drive system. As the core component is slewing ring drive, slewing gearbox can readily withstand the axial and radial forces. The slew drive worm gear slew drive working basic principle: The worm is driven by the electric 
motor, which drives the external ring of the slewing ring to rotate; The external ring output the torque through the flange and the internal ring of the slewing band is set in the housing.
Slewing drive has reverse self-locking due to worm gear drive with reverse self-locking characteristics. This feature greatly enhances the stability of the sponsor operating and safety factor. Compared to the traditional swing items, slewing travel gearbox is simple to install, easy to maintain, and saves considerable installation space.
