The crossed roller slewing ring can bear axial load, overturning moment and radial load at the same time. The structure and application of the crossed roller slewing bearing is basically the same as that of the four-point contact ball slewing bearing, except that the rolling elements change from steel balls to rollers, and the contact between the rolling elements and the inner and outer rings changes from point to contact line contact. Therefore, the load-carrying capacity increases, but the wear and friction torque increases