The material of the slewing ring directly determines the quality of the slewing bearing. The seal structure used in the slewing ring directly affects the sealing effect of the slewing ring. This article mainly discusses the choice of the material and the sealing structure of the slewing ring.
material
At present, both domestic and foreign use of 42CrMo alloy quenched and tempered steel as the material of the bearing ring, in the normal bearing mechanical properties requirements, it should also meet: (1) at the time of a test at 20 °C V-shaped impact absorption work The average value of the sample should not be less than 42 J. One of the samples should not be lower than 27 J. (2) The ring gear hardness is 260-290 HB. The material of the steel ball is a commonly used bearing steel, and there is no difference with a general slewing bearing.
Bearing seal
Because the slewing bearing used for marine cranes is easily exposed to foreign materials such as seawater during the working process, in order to prevent the entry of seawater leading to premature bearing failure, the bearing seal adopts a double-lip rubber seal structure, and the stainless steel wire is tightly hooped on the inner ring. The structure can effectively prevent the erosion of seawater and is easy to replace, and the sealing effect is reliable.
