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Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation
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Design and test a pneumatically actuated microgripper based on structural stiffness.

Xiaodong Chen1,2, Zhimin Xie1, Kang Tai2

  • 1National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China.

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|July 17, 2023
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Summary
This summary is machine-generated.

This study presents a novel two-stage pneumatic microgripper that enhances motion amplification. The optimized design achieves a significant displacement amplification ratio of 41.8 for both opening and closing actions.

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Area of Science:

  • Mechanical Engineering
  • Microfluidics
  • Robotics

Background:

  • Compliant motion amplification mechanisms face limitations in improving amplification ratios.
  • Pneumatically driven systems offer advantages in micro-scale manipulation.

Purpose of the Study:

  • To introduce a two-stage amplification microgripper utilizing structural stiffness for enhanced pneumatic actuation.
  • To optimize the design for improved amplification performance and reduced theoretical-experimental error.

Main Methods:

  • A two-stage mechanism with varying stiffness (high-stiffness first stage, low-stiffness second stage) and flexure hinges was designed.
  • Working mode analysis determined the optimal arrangement of mechanism stages.
  • Structural size optimization was employed to determine specific dimensions for optimal amplification.

Main Results:

  • The microgripper demonstrated good symmetry, a compact structure, and large output displacement.
  • Experimental results confirmed a displacement amplification ratio of 41.8 for both opening and closing operations.
  • The design effectively reduced the relative error between theoretical and experimental amplification ratios.

Conclusions:

  • The developed two-stage amplification microgripper successfully overcomes limitations in compliant motion amplification.
  • The optimized design provides high amplification ratios and accuracy for micro-gripping applications.
  • This approach offers a promising solution for advanced micro-manipulation tasks.