Automatic aligning device of automobile vacuum pump

The utility model relates to a self-aligning device, in particular to an automatic self-aligning device of an automobile vacuum pump. The pre-tightening device is composed of a rack, a mechanical arm,a vibration disc, a feeding piece, an aligning piece and a pre-tightening piece. Wherein the rack and the manipulator are arranged at intervals; a working arm of the manipulator extends to the upperpart of the rack; vibration discs are symmetrically and fixedly arranged on the rack working table plate below the manipulator working arm; feeding parts are symmetrically arranged on the working table plate on one side of the vibration disc, a stepping motor is fixedly arranged on the rack below the feeding parts, an output shaft of the stepping motor is connected with the feeding parts, a pre-tightening part is fixedly arranged on the working table plate on the other side of the vibration disc through a supporting rod, and an aligning part is fixedly arranged on the working table plate belowthe pre-tightening part. T