A flexible piezoelectric micro-clamp with two-stage displacement magnification for large stroke is designed. The structure performance is improved by the combination of straight hinge and flexible beam. The idea of"pseudo-rigid body model "is applied to the micro-clamp to realize the transformation of cell. Firstly

the structure design of micro-clamp is introduced and modeling and analysis are carried out

and optimal analysis on dimension parameters is carried out. Based on the energy method

calculate the magnification displacement of the bridge magnification mechanism

and obtain the theoretical magnification based on the principle of leverage.Secondly

the finite element analysis is carried out to verify the performance and safety of the micro-clamp and to paste the strain plate according to the strain parameters. The effective clamping displacement of clamp is large

magnification is high

structure is compact

and parallel clamping can be achieved. The unilateral output displacement is 237. 82 when there is no clamping

and the actual magnification is 23. 782 times. The micro-axis with a diameter of 0. 53 mm and a length of 8 mm is clamped

and 50 N forces are applied at the input end and the clamping force at the output end reaches 1. 95 N. Compared with similar micro clamp

it has good practical value.