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Slewing bearings, are extra-large rolling bearings consisting of an inner and outer annular seat ring and a rolling element, which are connected to the two parts of the structure of the machine or equipment that are rotating relative to each other to realise the relative slewing of the structure. Its field of application is very wide, covering almost all the need to withstand the combined load (including axial force, radial force and tilting moment) in the machinery and equipment.

The mill uses a variety of types of bearings, the specific selection needs to be based on the type of mill, working conditions and performance requirements and other factors for comprehensive consideration. In the selection of bearings, should give full consideration to its bearing capacity, limiting speed, precision requirements and lubrication and other factors, in order to ensure the stable operation of the mill and efficient production.

I. Structure and characteristics 1. Double row design: double row thin wall bearings adopt two rows of rolling element design, this structure makes the bearings have higher load carrying capacity and stiffness, and can withstand greater loads and impacts.

Three-row roller slewing bearing is one of the main bearings in our company, the main parts include outer ring, inner ring, isolation block, cage, three rows of rollers, sealing device and so on. According to the structure, they can be divided into three kinds: external gear, no gear and internal gear.