During the movement of the turntable bearing, there must be relative motion between the inner and outer rings of the bearing and the rolling body. In this way, friction will be generated between the moving bodies, which consumes part of the power and causes heat and wear between the inner and outer rings and the rolling body. In order to reduce friction resistance, slow down the wear speed of bearings and control the temperature rise of bearings, and improve the service life of bearings, the lubrication of bearings must be considered in the structural design of bearings, and the sealing of bearings must also be considered in order to keep the bearings smooth.
The sealing type of the bearing In order to keep the bearing in good lubricating conditions and normal working environment, give full play to the working performance of the bearing, and prolong the service life, the rolling bearing must have a suitable seal to prevent leakage of lubricant and dust, water vapor or Intrusion of other contaminants. This kind of sealing takes up little space, is convenient to disassemble and disassemble, and the cost is relatively low.
Turntable bearings are generally sealed with a single ring, and there are also multiple rings. On the one hand, the sealing of the slewing bearing is to prevent the filled grease from leaking out, and on the other hand, it is to prevent the outside dust, impurities and moisture from invading the inside of the bearing and affecting its normal operation. Since most of the slewing bearings work under heavy load and low speed, the sealing type of the bearing adopts two structures of rubber sealing ring and labyrinth sealing. The rubber sealing structure itself has the advantages of simple structure, small space occupation, and reliable sealing function, and has been widely used. Slewing bearings operating under working conditions should use labyrinth seals.
