What kind commonly used in machinery slewing

 Slewing bearing are often used in machinery and equipment, often used in cranes, excavators, mining machinery, concrete pumps and other various industries. The slewing ring, there are many types of different types have different functions and uses. Under normal circumstances will often use mechanical equipment: four point contact slewing bearing, single-row four point contact ball slewing bearing, three-row roller slewing ring and so on. These models slewing often be used.