Cylinder mechanical chuck

The utility model discloses an air cylinder mechanical chuck, which comprises an air cylinder, an air cylinder, a clamping mechanism, a clamping mechanism, a clamping mechanism, a clamping mechanism, a clamping mechanism, a clamping mechanism and a clamping mechanism, and is characterized in that the air cylinder is internally provided with a cavity, and the rear end of the cavity is provided with an opening; the sealing cover detachably covers the opening in a sealing manner, and the sealing cover is provided with a vent hole which is through in the front-back direction; the sliding seat is detachably arranged in the mounting hole, a sliding cavity is formed in the sliding seat, the rear end of the sliding cavity communicates with the cavity, and an open groove is formed in the side wall of the sliding seat; the piston is arranged in the cavity in a front-back sliding mode, and the ventilation hole and the mounting hole are separated by the piston; the sliding block is connected to the front end of the pisto