The slewing bearing is a new type of mechanical parts and components that have been gradually emerging in the world in the past 40 years. It is composed of inner and outer rings and rolling bodies, etc. The slewing bearing that has been shaped for production in China is mainly designed and manufactured by the former Rothe Erde company of Germany, organized by tianjin engineering machinery research institute designated by the ministry of mechanical industry in the early 1980s. Released on December 20, 1984 of the People's Republic of China machinery industry standard: JB / 2300-84 the rotary bearing type, basic parameters and technical requirements, composed mainly of machinery and electronics industry of tianjin engineering machinery research institute, xuzhou hering slewing bearing factory is responsible for drafting, the country then issued standard of construction machinery in 1991: JB36.1-36.3-91, released in 1999 and 2011 successively new machinery industry standard JB / 2300-1999 and JB / 2300-2011.
The slewing bearing is a kind of large bearing which can bear the comprehensive load and can bear the large axial, radial load and overturning moment at the same time. Slewing bearings are generally equipped with mounting holes, internal or external gears, lubricating oil holes and sealing devices, so that the design of the main engine is compact, easy to guide and easy to maintain. Slewing ring bearing presence of tooth, tooth and tooth in the four-point contact ball bearing, double row angular contact ball bearing, crossed cylindrical roller bearing, crossed tapered roller bearing and three composite bearings, four row cylindrical roller series, including four-point contact ball bearing has high static load capacity, crossed cylindrical roller with high load capacity, preloaded can make crossed tapered roller bearing bearing has great support stiffness and the rotation accuracy, three rows of cylindrical roller bearing combination because of the increase to the bearing capacity of the bearing height, forces respectively by different raceway, so under the same stress distribution, the bearing can greatly reduce diameter, Therefore, it is a kind of high bearing capacity slewing bearing that makes the main engine more compact. Slewing support bearings are widely used in lifting machinery, mining machinery, construction machinery, port machinery, ship machinery and equipment, as well as high-precision radar machinery and missile launchers and other equipment on the large slewing devices. At the same time, we can design, develop and produce various kinds of special structure slewing bearing according to the user's specific requirements.