Sand blasting covering and sealing jig for stainless steel parts of PVD (Physical Vapor Deposition) equipment

The utility model discloses a sand blasting shielding and sealing jig for stainless steel parts of PVD (physical vapor deposition) equipment, which belongs to the technical field of sand blasting processing of the parts of the PVD equipment, and comprises a first protective piece, a second protective piece, a third protective piece and a fourth protective piece which are matched with one another, the cylindrical part is provided with an inner surface and an end face which are attached to the outer surface of the circumference of the main body part and the end face of the protruding part of the second annular part in the part respectively. A first protection piece and a second protection piece which are matched with each other are arranged, and the inner surface and the end face, attached to the outer surface of the circumference of a main body part of a second annular part in a part and the end face of a protruding part, of the first protection piece are arranged; and the inner surface, attached to the outer