High-magnification microgripper with low output displacement loss

In order to solve the problem of excessive displacement loss of the traditional micro-displacement multi-stage amplification mechanism, a parallel-connection-driving concept is proposed, and a two-stage piezoelectric-driven microgripper based on the parallel-connection-driving concept was designed. The second-stage mechanism of the microgripper is driven by the first-stage mechanism, which hinders the displacement output of the first-stage mechanism, causing the displacement loss of the microgripper, resulting in the actual magnification being lower than the ideal magnification. In the parallel-connection-driving concept, multiple first-stage mechanisms of the same size and configuration drive the second-stage mechanism simultaneously, which effectively reduces the displacement loss of the mechanism. Combining the law of energy conservation and flexure beam theory, the impedance value of the second-stage mechanism to the first-stage mechanism is obtained, and then the magnification of the mechanism is accurately obtained. By optimizing the structural size of the mechanism, the performance of the mechanism is significantly improved. The experimental results prove the rationality of the theoretical calculation.