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Machines: Problem Solving I

Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...

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Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation

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Design of high-precision restrained pressure-driven microgripper based on folded rectangular hinge.

Xiaodong Chen¹, Huifeng Tan²

¹School of Mechanical Engineering, Shenyang Ligong University, Shenyang 110000, China.

The Review of Scientific Instruments

|March 18, 2025

Summary

This summary is machine-generated.

This study introduces a novel microgripper mechanism that significantly reduces parasitic movement by 80% using folding rectangular hinges. This design enhances clamping accuracy for precise micro-manipulation tasks.

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Area of Science:

Mechanical Engineering
Robotics
Micro-mechanics

Background:

The four-bar parallelogram mechanism is prevalent in microgrippers for its parallel clamping.
Parasitic vertical displacement during rotation limits the precision of traditional mechanisms.

Purpose of the Study:

To develop a high-precision microgripper by reducing parasitic movement.
To enhance clamping accuracy through innovative structural design.

Main Methods:

Introduction of a restrained amplification mechanism with folding rectangular hinges.
Utilizing pneumatic drive for large output force and displacement.
Application of Castigliano's second theorem to derive input pressure-displacement relationships.

Main Results:

Relative parasitic displacement reduced by 80% compared to traditional mechanisms.
Pneumatic drive effectively compensates for reduced output displacement from hinges.
Experimental validation shows microgripper achieves parallel clamping with a 2.0% error versus FEA.

Conclusions:

Folding rectangular hinges significantly improve microgripper clamping accuracy.
The novel mechanism design effectively minimizes parasitic displacement.
Pneumatic actuation is suitable for this microgripper, ensuring adequate force and displacement.