Magnetorheological Elastomer Gripper for Irregular Object Handling
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Solution Overview
Problem
Conventional grippers are ineffective in picking up atypical objects of various shapes, sizes, and materials due to limitations in mechanical and vacuum grippers, and require large contact areas and voltages for electroadhesive grippers, making them unsuitable for handling diverse and heavy objects.
Innovation Solution
A shape compliant gripper with a magnetorheological elastomer module that controls rigidity using a magnet part and control part, allowing deformation and adaptation to object shapes, combined with an electroadhesive module for secure grasping, utilizing air pressure to adjust the distance between the magnet part and elastomer for varying rigidity and applying electrostatic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical gripper is used to pick up objects, then it can mechanically grasp objects, but it cannot adapt to objects of various shapes and sizes without damage
Solution Approach 1:
The gripper finger uses a magnetorheological elastomer that can dynamically change its rigidity from soft to hard state by applying or removing a magnetic field. This dynamic property allows the finger to adapt its hardness to match the object being grasped, enabling safe handling of diverse objects with varying shapes and sizes while maintaining reliable grasping force.
Solution Approach 2:
The rigidity parameter of the gripper finger is changed by controlling the magnetic field applied to the magnetorheological elastomer. By adjusting the magnetic field strength, the finger transitions between soft and hard states, allowing the system to adapt to different object characteristics and grasp requirements without physical reconfiguration.
2Force
If a vacuum gripper is used to pick up objects, then it can grasp objects through suction, but it cannot handle heavy or irregularly shaped objects effectively
Solution Approach 1:
The magnetorheological elastomer provides dynamic rigidity adjustment, allowing the gripper finger to transition from a soft compliant state during approach to a hard rigid state during grasping. This enables the finger to maintain structural integrity for heavy objects while remaining compliant enough to conform to irregular shapes, overcoming the limitations of both vacuum and fixed-rigidity mechanical grippers.
Solution Approach 2:
The gripper finger combines magnetorheological elastomer with magnetic particles and structural components to create a composite material system. This composite structure integrates the compliance needed for shape adaptation with the strength required for heavy object handling, achieving both high grasping force and versatility.
3Force
If an electroadhesive gripper is used to pick up heavy objects, then it can generate strong adhesion force, but it requires large contact area and high voltage
Solution Approach 1:
The magnetorheological elastomer enables rapid transition between soft and hard states through magnetic field control, allowing the gripper to achieve effective contact with minimal adjustment time. This dynamic adaptation eliminates the need for large contact areas required by conventional electroadhesive grippers, as the finger can optimally conform to the object surface in its soft state and then lock into position in its hard state.
Solution Approach 2:
The patent replaces the electroadhesive mechanism (which requires high voltage and large contact areas) with a magnetorheological elastomer-based mechanical system. The magnetorheological elastomer responds to magnetic field changes rather than requiring high voltage, simplifying the device while achieving comparable or superior grasping performance with reduced complexity.
4Device complexity
If a conventional gripper is used to handle atypical objects, then it can maintain simple structure, but it cannot achieve reliable grasping of diverse materials
Solution Approach 1:
The magnetorheological elastomer allows the gripper to change its rigidity parameter in response to different object materials and shapes. This single parameter change enables the same simple structural design to reliably grasp diverse materials by adapting its mechanical properties rather than requiring complex reconfiguration or multiple specialized grippers.
Solution Approach 2:
The magnetorheological elastomer-based finger serves multiple functions: it provides compliant contact for shape adaptation, generates grasping force through rigidity transition, and maintains structural integrity for heavy objects. This multi-functionality within a single component achieves reliable grasping of diverse materials while maintaining structural simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the secure and efficient picking of atypical objects by varying the rigidity of the gripper to match object shapes and sizes, ensuring reliable grasping and handling of diverse materials with a simplified mechanism.
Implementation Method 1
a shape compliant module disposed on the body and having rigidity capable of being variably controlled, wherein the shape compliant module comprises a magnetorheological elastomer, a magnet part
Implementation Method 2
the control part may control a distance between the magnet part and the magnetorheological elastomer using an air pressure
Implementation Method 3
combined with an electroadhesive module for secure grasping, utilizing air pressure to adjust the distance between the magnet part and elastomer for varying rigidity and applying electrostatic forces
Data Source
AI summary
A shape compliant gripper with which an atypical object having various shapes, sizes and materials can be picked. The shape compliant gripper comprises a body and a shape compliant module disposed on the body and having rigidity capable of being variably controlled. Further, the shape compliant module comprises a magnetorheological elastomer, a magnet part, and a control part for controlling a position of the magnet part with respect to the magnetorheological elastomer.