Research on three-stage amplified compliant mechanism-based piezo-driven microgripper

• Published in: Advances in mechanical engineering Vol. 12; no. 3; p. 168781402091147
• Main Authors: Chen, Xiaodong, Deng, Zilong, Hu, Siya, Gao, Xingjun, Gao, Jinhai
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.03.2020; Sage Publications Ltd; SAGE Publishing
• Subjects: Amplification; Amplifier design; Amplifiers; Energy methods; Finite element method; Miniaturization; parallel grasping; high magnification; Compact structure; miniaturization design; microgripper; three-stage amplifier
• ISSN: 1687-8132; 1687-8140; 1687-8140
• DOI: 10.1177/1687814020911470

The microgripper based on the principle of lever amplification is easy to realize; however, the theoretical amplification factor is limited by the space size and the structure is not compact enough. The microgripper based on the triangular amplification principle has a compact structure and high amplification factor, but it is not conducive to miniaturization design. Considering compactness, parallel clamping, high magnification, and miniaturization design, a three-stage amplifier consisting of a semi-rhombic amplifier and lever amplifiers is designed. To begin with, the theoretical amplification ratio and the relationship between input variables and output variables are calculated by energy method. Furthermore, the finite element analysis software is used to optimize the structural parameters and analyze the performance of the model. Lastly, the experimental verification is carried out. At 150 V of driving voltage, the maximum output displacement was 530mm, and the actual magnification was 24 times. Microparts can be gripped in parallel and stably, which confirms the validity of the design.