Isolation block capable of being pre-tightened for crossed roller turntable bearing

The utility model relates to a pre-tightening isolation block for a crossed roller turntable bearing, which is assembled between two adjacent rolling bodies and consists of arc plates which are distributed on two sides in a crossed manner and a middle connecting body for connecting the arc plates on the two sides, protruding structures making contact with the outer circumferential face of the corresponding rolling body are arranged on the concave face of each arc plate along the two sides of the corresponding arc-shaped groove. When the structure is assembled on the crossed roller turntable bearing, the contact points of the isolation block and the rolling body are the two convex points on the outer side of the arc-shaped groove, the arc plate at the rear parts of the convex points slightly deforms to provide certain wrapping force for the rolling body, and compared with the original structure that the rolling body and the isolation block are only in contact at the bottom of the groove, the contact can better