Slewing bearing has a wide range of applications in our life, referred to as "the machines arthrosis ", and so is widely used in engineering machinery, construction machinery, environmental protection and light machinery, mining and metallurgical machinery , the port and ship machinery, food and packaging machinery, petrochemical machinery, engineering vehicles and military equipment, apparatus and instrumentation industries.Slewing beaings have With the following characteristics, Compact structure and light weight, structural rigidity, and the smooth operation and high precision, safe and reliable.