基于刚度关系的柔性压电微夹钳设计

Design of flexible piezoelectric micro-clamp based on stiffness relationship

设计的微夹钳直接推动短臂杠杆,结构简单、能量损失小。首先,通过几何关系计算出微夹钳各铰链刚度关系,以刚度为目标设计微夹钳,并对微夹钳结构参数进行优化。然后,通过ANSYS对微夹钳性能进行分析,并与理论值进行对比。最后对微夹钳钳指进行应变分析,找出应变片粘贴位置,根据应变关系找出输入—输出端关系。该微夹钳结构紧凑、灵敏度高、可平行夹持。无夹持对象时最大输出位移为79.648μm,夹持直径为0.3 mm、长6 mm的微轴,输入端施加1 N力时,输出端夹持力为203.5 m N。

The micro-clamp designed in this paper directly drives the short arm lever,which has simple structure and low energy loss.Firstly,the stiffness relationship of each hinge of the micro-clamp is calculated through geometric relationship,and the micro-clamp is designed with the stiffness as the objective,and the structural parameters of the micro-clamp are optimized.Then,the performance of the micro-clamp is analyzed and compared with the theoretical value.Finally,the strain analysis of the micro-clamp finger is carried out to find out the position of strain gauge sticking,and the relationship between input and output is found according to the strain relationship.The micro clamp has compact structure,high sensitivity and can be clamped in parallel.When there is no clamping object,the maximum output displacement is 79.648μm,the clamping diameter is 0.3 mm and the length is 6 mm.When the input is applied with 1 N force,the output clamping force is 203.5 m N.