Piezoelectric driving micro clamp with three-stage displacement amplification function and parallel clamping function

Abstract

The invention discloses a piezoelectric driving micro clamp with three-stage displacement amplification and capable of realizing parallel clamping, which comprises a piezoelectric ceramic driving part, a first-stage displacement amplification mechanism, a second-stage displacement amplification mechanism and a third-stage displacement amplification mechanism, the piezoelectric ceramic driving part is connected with the first-stage displacement amplification mechanism, and the second-stage displacement amplification mechanism is connected with the third-stage displacement amplification mechanism. The first-stage displacement amplification mechanism is connected with the second-stage displacement amplification mechanism in series, the two output ends of the second-stage displacement amplification mechanism are each connected with one third-stage displacement amplification mechanism, the two third-stage displacement amplification mechanisms are connected in parallel, and the output ends of the two third-stage displacement amplification mechanisms are connected with the two clamping parts of the clamp respectively.

Description

technical field [0001] The invention relates to the field of piezoelectric drive, in particular to a piezoelectric-driven micro-clamp with a three-stage displacement amplification mechanism and capable of parallel clamping. Background technique [0002] In recent years, domestic scholars have designed micro-grippers based on different driving principles, such as piezoelectric (PZT) driving, electrostatic driving, thermal driving, electromagnetic driving, shape memory alloy driving, and pneumatic driving. Electrostatic drive is mainly realized by electrostatic comb drive, which has the advantages of high efficiency, fast response, low energy consumption, and simple structure. But it also has the obvious disadvantage of low clamping force. Thermal actuation takes the form of expansion induced by the use of conductive materials. The advantage is that the driving force is large, but it also has the disadvantage of slow response speed. In contrast, PZT-actuated microgrippers a...

AI Technical Summary

Problems solved by technology

After reviewing literature and other materials by Guangfa, it is found that the displacement amplification ratio of the micro grippers designed at home and abroad basically does not exceed 30. In addition, if the parallel movement of the jaws can be realized, the gripping operation will be more reliable and easy, and at the same time, the high displacement amplification The ratio means that the deformation of the clamp body is larger, the structural stiffness becomes smaller, the natural frequency of the structure decreases, and the actual working bandwidth of the micro-clamp becomes smaller

Images