Polyurethane Vibratory Screen Reinforcement
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Solution Overview
Problem
Molded polyurethane screens have relatively low open area percentages due to large dividing strips, resulting in inefficient screening performance.
Innovation Solution
The design incorporates a flexible molded polyurethane body with reinforcement members molded integrally into a bi-directional grid structure, featuring thinner support members and larger screen openings, which increases the open screening area to 40-46% and enhances structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large dividing strips are used in molded polyurethane screens, then structural strength is improved, but open area percentage decreases
Solution Approach 1:
The patent incorporates reinforcement members (such as wire mesh, fabric, or structural profiles) embedded within the polyurethane matrix to create a composite structure. This allows the dividing strips to be thinner while maintaining structural strength, thereby increasing the open area percentage to 40-46% of the total screen surface area.
Solution Approach 2:
The reinforcement members are strategically positioned at critical locations within the dividing strips and at the intersections of screen openings, providing localized strength enhancement. This allows the overall strip thickness to be reduced while maintaining structural integrity where most needed.
2Productivity
If thinner support members are used to increase open area, then screening efficiency is improved, but structural integrity deteriorates
Solution Approach 1:
The patent uses composite construction with reinforcement members embedded in the polyurethane material, allowing support members to be thinner while compensating for reduced thickness through the reinforcing elements. This maintains structural integrity during vibratory operation while maximizing open area for improved screening efficiency.
Solution Approach 2:
The patent extracts the structural support function from the polyurethane material itself and assigns it to separate reinforcement members. This allows the polyurethane to form thinner dividing strips while the reinforcement members provide the necessary structural strength, resolving the contradiction between thickness and open area.
3Strength
If reinforcement members are added to thin support members, then structural support is improved, but device complexity increases
Solution Approach 1:
The patent merges the reinforcement members with the polyurethane material through integral molding or embedding processes, creating a unified composite structure. This integration approach reduces device complexity compared to assembling separate components, as the reinforcement and polyurethane form a single molded unit with interlocking features.
Solution Approach 2:
The reinforcement members serve multiple functions simultaneously: providing structural strength, maintaining dividing strip geometry, and enabling thinner overall construction. This multi-functionality reduces the need for additional separate structural elements, thereby reducing overall device complexity.
Data Source
AI summary
A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, first members extending between the side edge portions and the second members extending between the lower edge portion and the upper edge portion, third members substantially parallel and extending transversely between the side edge portions and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, reinforcement members molded integrally with the third and fourth members.