Self-locking and positioning clamp for P-position ratchet wheel machining

The utility model discloses a self-locking and positioning clamp for P-position ratchet wheel machining. The clamp comprises a spring chuck shaft base, a workpiece positioning ring, a spring chuck bolt and a spring chuck sleeve, wherein spring clip tightening wheels are fixed to the spring chuck bolt, a connecting hole is formed in the axial center of the spring chuck shaft base, the spring chuck bolt is movably connected with the spring chuck shaft base through the connecting hole, the spring chuck sleeve is of a cup-shaped structure with the bottom surface open, the inner wall and the outer wall of the spring chuck sleeve are of a conical surface structure and an excircle surface structure respectively, the bottom surface of the spring chuck sleeve is fixed between two spring clip tightening wheels, the inner wall and the outer wall of the spring chuck sleeve are in contact with the right outer edge of the spring chuck shaft base and a workpiece respectively, the spring chuck sleeve is provided with a clamping gap, a conical surface structure matched with the inner wall of the spring chuck sleeve is arranged on the right outer edge of the spring chuck shaft base, the workpiece positioning ring is fixed to the spring chuck shaft base, the workpiece is installed on the excircle surface of the spring chuck sleeve in a sleeving mode, and the workpiece positioning ring is in close contact with the end face of the workpiece. By the adoption of the clamp, automatic workpiece locking and positioning can be achieved, and efficiency is high.