Hydraulic clamping device for tight numerical control lathe part machining

The utility model discloses a hydraulic clamping device for compact numerical control lathe part machining, which comprises a chuck shell, a movable claw, a chassis and a mounting disc, a rotating disc is movably arranged in the chuck shell, a plurality of circles of spiral lines are wound outside the rotating disc, the movable claw is movably arranged on the rotating disc, and a threaded groove is arranged at the bottom of the movable claw. A fixed shaft is arranged in the center of the bottom of the rotating disc, a worm gear is rotationally arranged in the chuck shell, the center of the worm gear and the shaft on the rotating disc are mutually fixed, a worm is movably arranged in the chuck shell, the worm is meshed with the worm gear, and a hydraulic motor is further fixed in the chuck shell; the output end of the hydraulic motor is connected with one end of the worm. The worm gear and the worm are matched with each other, so that the chuck has a self-locking function, and the clamping jaws are prevented f