Slewing ring bearing is a kind of large bearing which can bear the combined load of large axial load, radial load and overturning moment at the same time.Generally, the swing bearing itself is equipped with mounting holes, lubricating oil and sealing devices, which can meet the different demands of various hosts working under various working conditions.On the other hand, the turntable bearing itself has the compact structure characteristics, easy to guide rotation, simple installation and easy maintenance, which is widely used in large slewing ring such as lifting transport machinery, extractors, construction machinery, port machinery, wind power generation, medical equipment, radar and missile launcher.
Swing ring usually consists of four parts, including inner ring, outer ring, rolling body and isolation block.As the core part adopts slewing bearing, it can bear axial force and radial force at the same time.It has many forms, but its structure is basically the same.
Slew ring bearings is a new type of mechanical part which has been gradually emerging in the world in the past 40 years. It is composed of inner and outer rings, rolling bodies and so on. At present, the slewing bearing of the fixed production in China is a large bearing which can bear comprehensive load, and can bear large axial, radial load and overturning moment at the same time.
Generally, the slewing bearing rolling body is made of whole hardened carbon chromium bearing steel.Made of GCr15 or GCr15SiMn steel;The swing bearing ring is made of hardened steel on the surface. When the user has no special requirements, 50Mn steel is generally used for manufacturing. However, in order to meet the needs of the host in some special applications, other grades of hardened steel can be selected according to the specific conditions provided by the user, such as 42CrMo, 5CrMnMo, etc.
The slewing ring cage has integral type, section type, isolation block type and other structural forms.The integral type and segment type retainer are made of 20 steel or ZL102 cast aluminum alloy.The separator is made of polyamide 1010 resin and ZL102 cast aluminum alloy.With the material industry continuous development, nylon GRPA66.25 is also widely used in the design of sectional cage.
