Clamp for machining main hole of double-lug hinge

The invention provides a double-lug hinge main hole machining clamp which comprises a bottom plate and a fixing seat, the bottom plate is installed on the lower end face of the fixing seat, the upper end face of the fixing seat is sunken downwards to form a rectangular cavity used for containing a double-lug hinge workpiece, a base plate with a large through hole is laid on the bottom face of the rectangular cavity, and the large through hole is formed in the base plate. A large through hole is formed in the base plate, the large through hole in the base plate corresponds to a double-lug hinge main hole, lining plates are attached to the three side walls of the rectangular cavity, and a plurality of threaded through holes are formed in the circumferential face of the fixing base and used for installing set screws. According to the clamping device, the rectangular cavity is formed in the fixing base, the lining plates are attached to the three side walls of the rectangular cavity, when the clamping device is u