Fixture for polishing of outer circular surface of jade bracelet

The invention relates to a fixture for polishing of an outer circular surface of a jade bracelet. The fixture comprises a supporting plate, a cylinder, a screw, a sliding block, a limiting table, limiting grooves, a guide hole and a supporting structure, wherein the supporting plate is connected to a workbench; the cylinder is arranged at the top of the supporting plate; the screw is rotationallyconnected to the top of the supporting plate and is arranged in the cylinder in a sleeved mode; the section of the sliding block is trapezoidal, and the sliding block is arranged on the screw in a sleeving mode; the limiting table is arranged in the circumferential direction of the sliding block; the limiting grooves are matched with the limiting table and are uniformly formed in the inner wall ofthe cylinder along the center line of the cylinder; the guide hole is formed in the circumferential direction of the cylinder and communicates with the cylinder; and the supporting structure is arranged in the guide hole. The