Gecko Biomimetic Adhesive Pad with Balanced Loading Mechanism
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Solution Overview
Problem
Conventional gecko biomimetic adhesive mechanisms face challenges in manufacturing scalability, unbalanced loading capabilities in different directions, and the buckling effect due to the rigidity of polymer film tendons.
Innovation Solution
A grasping device with a gecko biomimetic adhesive pad, featuring retractable and rotatable connecting structures that provide balanced loading forces in both the X and Y directions, while avoiding twisting through adjustable third and fourth connecting structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rope tendons are used to load the gecko biomimetic adhesive pads, then the mechanism can be manufactured and assembled, but the loading capability is unbalanced with preferred shear (X) capability being 2-3 times larger than lateral shear (Y) capability
Solution Approach 1:
The patent employs asymmetric tendon routing where tendons are attached at different positions and angles on opposite sides of the adhesive pad. This asymmetric configuration ensures that when tendons are pulled, they generate both X-direction and Y-direction shear forces simultaneously, achieving balanced loading capability in both directions rather than the traditional symmetric routing that only optimizes one direction.
2Manufacturing precision
If polymer film tendons are used to reduce elasticity and elongation, then the tendon elongation under stretching is reduced, but the rigidity introduces buckling effect under compression causing unwanted twisting of the adhesive pads
Solution Approach 1:
The patent uses flexible rope tendons that can dynamically adapt their behavior based on loading conditions. These tendons are routed through guide elements that constrain their movement paths, allowing them to effectively transmit force in tension while preventing buckling in compression through the geometric constraints of the routing path rather than relying on the tendon material's rigidity.
Solution Approach 2:
The patent introduces guide elements (such as holes or channels in the bracket or pad structure) as intermediary components that mediate the tendon's force transmission. These guide elements constrain the tendon's movement and prevent lateral buckling while allowing the tendon to flex and elongate naturally, thus eliminating the need for rigid polymer films that would cause twisting.
3Ease of manufacture
If flexible tendons are routed and tied to pre-drilled holes on the adhesive pad edge, then the mechanism can be assembled, but it is difficult to manufacture and scale up with lack of freedom for adjustment
Solution Approach 1:
The patent designs a universal bracket structure with integrated guide elements that can accommodate tendons of various lengths and routing configurations. The bracket serves multiple functions: structural support, tendon guidance, and adjustment mechanism. This universal design allows the same basic structure to be used across different scales and applications, improving manufacturability while maintaining adjustability through simple tendon length variations rather than requiring different bracket designs.
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
The solution achieves balanced loading capabilities in both X and Y directions, prevents twisting of the gecko biomimetic adhesive pads, and enhances manufacturing scalability and adjustability.
Implementation Method 1
Gecko biomimetic adhesive is a gecko-inspired dry adhesion surface, which provides adhesion through intermolecular interaction
Implementation Method 2
the rope tendon elongates under loading (stretch) due to its elasticity
Data Source
AI summary
The present disclosure discloses a grasping device, a robot grasping jaw and a robot. The grasping device includes: a bracket; a gecko biomimetic adhesive pad having a first surface with a directional dry adhesion structure; a first connecting structure connecting the bracket and a first side of the gecko biomimetic adhesive pad; and a second connecting structure provided opposite to the first connecting structure and connecting the bracket and a second side of the gecko biomimetic adhesive pad. The first connecting structure is retractable. The first connecting structure and the second connecting structure are configured to collaboratively provide a loading force in a first direction to the gecko biomimetic adhesive pad.