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Mechanical Sciences An open-access journal for theoretical and applied mechanics
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Volume 7, issue 1
Mech. Sci., 7, 119-126, 2016
https://doi.org/10.5194/ms-7-119-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Mech. Sci., 7, 119-126, 2016
https://doi.org/10.5194/ms-7-119-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Apr 2016

Research article | 12 Apr 2016

Mechanical design, analysis and testing of a large-range compliant microgripper

Yilin Liu and Qingsong Xu Yilin Liu and Qingsong Xu
  • Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Avenida da Universidade, Taipa, Macau, China

Abstract. This paper presents the mechanical design, analysis, fabrication, and testing procedures of a new large-range microgripper which is based on a flexible hinge structure. The uniqueness of the gripper is that the gripper arms not only provide large gripping range but also deliver approximately rectilinear movement as the displacement in nonworking direction is extremely small. The large gripping range is enabled by a mechanism design based on dual-stage flexure amplifier to magnify the stroke of piezoelectric actuator. The first-stage amplifier is a modified version of the Scott Russell (SR) mechanism and the second-stage amplifier contains a parallel mechanism. The displacement amplification ratio of the modified SR mechanism in the gripper has been enlarged to 3.56 times of the conventional design. Analytical static models of the gripper mechanism are developed and validated through finite-element analysis (FEA) simulation. Results show that the gripping range is over 720µm with a resonant frequency of 70.7Hz and negligible displacement in nonworking direction. The total amplification ratio of the input displacement is 16.13. Moreover, a prototype of the gripper is developed by using aluminium 7075 for experimental testing. Experimental results validate the analytical model and FEA simulation results. The proposed microgripper can be employed in various microassembly applications such as pick-and-place of optical fibre.

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This paper presents the design and testing of a new large-range compliant microgripper. The gripper arms not only provide large gripping range but deliver approximately rectilinear movement as the displacement in nonworking direction is extremely small. The large gripping range is enabled by a dual-stage flexure amplifier to magnify the stroke of piezoelectric actuator. Finite-element analysis simulation study has been conducted. A prototype of the gripper is developed for experimental testing.
This paper presents the design and testing of a new large-range compliant microgripper. The...
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