Vacuum Gripper Sealing Material for Rough Surface Adhesion
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Solution Overview
Problem
Vacuum grippers face challenges in maintaining a seal on rough surfaces, requiring high suction power and force, and are inefficient in terms of energy consumption and uniform pressure distribution, especially for complex or variable geometry surfaces.
Innovation Solution
The application of an unctuous material with specific viscosity and surface tension properties around the outer sidewall of open pore suction cups enhances sealing, allowing for lower power consumption and improved adhesion with reduced pressing force, enabling better gas barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional smooth vacuum grippers are used on rough surfaces, then adhesion can be established, but high suction power and pressing force are required, leading to high energy consumption
Solution Approach 1:
The patent introduces an unctuous material as an intermediary substance applied to the outer sidewall of the suction cup. This material acts as a mediator between the smooth suction cup and the rough surface, filling gaps and creating a reliable seal without requiring excessive suction power or pressing force, thereby reducing energy consumption while maintaining adhesion reliability
Solution Approach 2:
The patent changes the physical-chemical parameters of the suction cup surface by applying an unctuous material with specific viscosity and surface tension properties. This modification allows the suction cup to adhere to rough surfaces at lower vacuum pressures and with reduced pressing force, directly addressing the energy consumption issue
2Strength
If higher pressing force is applied to improve seal on rough surfaces, then adhesion strength increases, but the complexity of pressure distribution control increases
Solution Approach 1:
The unctuous material serves as a compliant intermediary layer that automatically distributes pressing forces uniformly across the rough surface. Its viscous and surfactant properties allow it to flow into surface irregularities, eliminating the need for complex pressure distribution control mechanisms while achieving strong adhesion
3Adaptability or versatility
If vacuum grippers are used on surfaces with complex geometry, then grasping capability is achieved, but alignment precision requirements increase
Solution Approach 1:
The unctuous material modifies the effective contact parameters by creating a conformal interface between the suction cup and complex geometry surfaces. Its ability to flow and adhere to irregular surfaces reduces the sensitivity to alignment errors, allowing grasping of complex geometries without requiring high alignment precision
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
This solution enables a more efficient and enduring vacuum seal with lower energy requirements, allowing for longer attachment times and improved grasping of rough surfaces with reduced pressure and alignment needs, suitable for various applications including drone attachment and heavy load handling.
Implementation Method 1
an unctuous sealing material sealing around an outer side of the barrier wall, the material exhibiting a viscosity of at least 10^4 centipoise when subjected to shear forces of 10 Pa to 1 kPa, and exhibiting a viscosity less than 10^6 centipoise under shear stress of 10 kPa
Implementation Method 2
placing the suction cup against the rough surface while drawing a vacuum on the inner volume, so that the wall crushes, the material seals the cup, and the support approaches the rough surface
Data Source
AI summary
The use of an unctuous sealing material (high viscosity liquid bordering on, or having, solid behavior at low shear forces) for sealing open pore, highly crushable suction cups allows for increased surface conformation for fast secure vacuum gripping, and maintenance of the pressure differential with lower energy in view of the seal. Furthermore, fast grasping is demonstrated if the unctuous sealing material protrudes from the lip.