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Development of a two-stage amplification microgripper for high-precision applications
Xiaodong Chen1, Huibin Sun1, Huifeng Tan2
1School of Mechanical Engineering, Shenyang Ligong University, Shenyang 110000, China.
The Review of Scientific Instruments
|May 1, 2026
Summary
This study presents a novel microgripper design featuring a two-stage amplification mechanism to minimize parasitic displacement during micro-grasping. The innovative design achieves high precision and a large stroke for micromanipulation tasks.
Area of Science:
- Robotics and Mechatronics
- Micro-engineering
- Precision Mechanics
Background:
- Microgrippers are essential for manipulating microscale objects.
- Parasitic displacement of gripping jaws is a major challenge in high-precision micro-grasping.
- Existing microgripper designs often struggle to balance stroke length and precision.
Purpose of the Study:
- To propose and validate a novel two-stage amplification mechanism for microgrippers.
- To significantly reduce parasitic displacement in micro-grasping operations.
- To achieve high-precision micromanipulation with a large operational stroke.
Main Methods:
- Design of a two-stage amplification mechanism incorporating a symmetrical compound parallelogram mechanism with flexure hinges.
- Utilizing an externally actuated microgripper with displacement compensation.
- Conducting simulations to evaluate parasitic displacement rates.
- Experimental validation of the microgripper prototype's performance.
Main Results:
- Simulations demonstrated a parasitic displacement rate of only 0.158% for the proposed microgripper.
- Experimental results showed a total output displacement of 490.3 μm at 0.6 MPa air pressure.
- Achieved a total amplification ratio of 29.1 and a first-order natural frequency of 1625 Hz.
Conclusions:
- The designed microgripper effectively minimizes parasitic displacement through its two-stage amplification mechanism.
- Experimental validation confirms the design's rationality and high performance.
- The microgripper shows significant potential for micromanipulation tasks requiring both large stroke and high precision.
