Composite Vacuum Gripper Seal for Irregular Surface Grip
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Solution Overview
Problem
Vacuum grippers face significant challenges in maintaining a strong grip on objects with irregular surface topologies due to the inability of existing sealing elements to conform to both macroscopic and microscopic irregularities, leading to lateral shifts and compromised vacuum conditions.
Innovation Solution
A composite sealing element comprising a compressible sealing element and an elastic sealing element, where the compressible element applies isotropic pressure to the elastic element, allowing it to conform to irregular surfaces through a fluid-filled interior that redistributes pressure and maintains contact with the object surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a deformable sealing element made of closed-cell foam is used to conform to irregular surfaces, then the sealing element can fill pockets of the object's irregular surface, but the surface of the foam has a low friction coefficient and may slip regardless of vacuum strength
Solution Approach 1:
The sealing element combines closed-cell foam material with a friction-enhancing surface coating or treatment. The foam provides deformability to conform to irregular surfaces, while the coating layer provides high friction coefficient to prevent slipping. This composite structure resolves the contradiction between conformability and grip stability.
Solution Approach 2:
The sealing element has different properties in different regions: the bulk foam material provides compressibility and conformability, while the surface layer provides high friction. This local differentiation of material properties allows the sealing element to simultaneously achieve surface adaptation and stable gripping without slipping.
2Adaptability or versatility
If the sealing element is made with suitable collapsible material to fill irregular surface pockets, then it can conform to the object surface, but it may be prone to over-compression or over-deformation across its width or height
Solution Approach 1:
The sealing element is divided into multiple segments or cells within the foam structure, allowing localized compression and deformation while maintaining overall structural integrity. This segmentation prevents over-compression by distributing the compressive forces across multiple independent cells rather than allowing the entire structure to collapse uniformly.
Solution Approach 2:
The foam material's cellular structure provides inherent cushioning and energy absorption capabilities before over-compression occurs. The closed-cell structure compresses in a controlled manner, absorbing excess energy and preventing sudden structural failure or over-deformation of the sealing element.
3Strength
If a bracing structure with high rigidity is used behind the sealing element to prevent over-compression, then it provides structural support, but it does not prevent the sealing element from shifting laterally
Solution Approach 1:
The sealing element incorporates a flexible outer shell or membrane that provides lateral constraint while allowing the internal foam structure to compress vertically. This flexible shell prevents lateral shifting and maintains the sealing element's position against the irregular surface, while still permitting the necessary compression for conformability.
4Reliability
If an inelastic sealing material is used to prevent deformations and leakage, then it maintains seal integrity under pressure gradients, but it is unable to finely conform to irregular surface textures
Solution Approach 1:
The sealing element uses a composite structure where the bulk material provides inelastic properties for seal integrity and leakage prevention, while a separate elastic surface layer or coating provides the conformability needed to adapt to fine surface textures and irregularities. This composite approach allows both seal reliability and surface adaptation.
Solution Approach 2:
The sealing element transitions from a purely two-dimensional seal to a three-dimensional structure with depth variation. The foam material provides vertical compliance to conform to surface irregularities, while the overall structure maintains horizontal seal integrity through its encapsulated design and flexible constraints.
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 composite sealing element effectively improves vacuum gripper performance by conforming to both macroscopic and microscopic surface features, preventing lateral shifts and ensuring a secure grip on irregular surfaces.
Implementation Method 1
a compressible sealing element and an elastic sealing element... the compressible element applies isotropic pressure to the elastic element
Implementation Method 2
through a fluid-filled interior that redistributes pressure and maintains contact with the object surface
Implementation Method 3
The contact surface of the elastic sealing element elastically conforms to an irregular surface topology of the object surface
Data Source
AI summary
A vacuum gripper sealing element allows a vacuum gripper to suitably conform to irregular surface topology without compromising vacuum conditions. The sealing element utilizes a compressible sealing element which at least partially encapsulates an elastic sealing element. Upon being pressed against an object surface, the compressible sealing element will conform within and around macroscopic peaks, valleys and other irregular physical features. While conforming to macro-scale features, the compressible sealing element applies pressure isotropically upon the encapsulated elastic sealing element, which elastically conforms to micro-scale features while pressed thereagainst. The elastic sealing element has a fluid-filled interior that is surrounded by an elastic outer layer. While under pressure against an irregular surface topology, the fluid-filled interior displaces so as to redistribute internal forces, conforming the elastic outer layer to the micro-scale features of the object surface.