Slewing called wheel bearings, some people call it: rotary support, swing support.

Applications
1, construction machinery
Slewing widely used construction machinery is initially applied slewing is the most widely used in places such as earthmoving machinery, excavators, disintegration machine, stacker reclaimer, graders, rollers, compaction machines, drilling machines, clutch bearing machines. Others include:
  Concrete: Concrete pump truck, concrete mixer booms machine, belt fabric machine
  Feeding Machinery: disc feeder, sand mixer
  Lifting: wheeled cranes, crawler cranes, gantry cranes, tower cranes, forklifts, with the crane, gantry crane
  Ground handling machinery: impact of reverse circulation drilling, rotary drilling rig, impact rotary drilling rigs, rotary drilling rig, reverse circulation rotary drilling rig, positive cycle rotary rig, long auger drilling rig, engineering drilling rig diving, static pile driver, pile
  Engineering ship: Dredger
  Special Purpose Vehicle: bridge inspection car, fire engine, gondola, flat beam carrier, aerial vehicles, self-propelled aerial work platforms
  Light Industry Machinery: beverage machinery, blow molding machine, packaging machinery, filling machines, rotary bottle unscrambler, plastic injection molding machines ship cranes
2, various device platforms
In addition to various engineering machinery, the slewing range of applications has been gradually expanded and now similar port equipment, metallurgical equipment, drilling platforms and other device platforms have begun to use a wide range of slewing bearings instead of the original. Port Equipment: Port cranes, stackers
  New Energy Equipment: Wind power generation equipment, solar power equipment
  Metallurgical equipment: Metallurgical cranes, ladle turret, grasping steel machine, clay gun, blowing device
  Playground Equipment: Ferris wheel
  Airport Facilities: Airport tanker
  Military equipment: Radar, tanks, etc.
  Robot: palletizing robots, welding robots, robots
  Medical equipment: Gamma Knife
  Environmental protection equipment: scrapers
  Parking Equipment: Tower Garage
  Drilling platform equipment, kitchen equipment, numerical control equipment (cutting machine, quenching machine), brick