lock ing Worm and Worm Gear and Crank The Self-centering, Power-driven and External-clamping Device Based on Self- - Connecting Rod Drive

The working principle of a self-centering, power- driven and external-clamping device is induced. The device is based on self-locking worm and worm wheel and slot-and- crank drive. Its mechanical properties and calculation formula is also given out. After the device being driven by gear motor, output torque rotates the driving and driven gears first, and then transmits the driving force to the upper and the lower worms; Then the upper and the lower worms rotate their meshing worm gears separately and the worm gears sway the upper and the lower crank-connecting rods articulated in worm gears; Lastly, three times amplification of the force is realized by the force-amplifier of the upper and the lower crank connecting rods. The device can center automatically up and down and clamps the workpiece. Besides, the device is with less energy conversion equipments, compact structure, well flexibility and high greenization.