Polyurethane Vibratory Screen Segmented Grid
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Solution Overview
Problem
Molded polyurethane screens have relatively low open area percentages due to large dividing strips, resulting in inefficiencies.
Innovation Solution
A vibratory screen with a flexible molded polyurethane body featuring a grid structure with reinforcement members, where first and second members form screening openings, and third and fourth members provide additional structural support, increasing the open screening area and efficiency.
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 screen structure is segmented into multiple components: thin first and second members forming the screening surface, and thicker third and fourth members providing structural support. This segmentation allows the support function to be separated from the screening function, enabling thin dividing strips that maintain high open area percentage while structural integrity is provided by the reinforced support members at intersections.
Solution Approach 2:
The screen employs a composite structure where polyurethane material is used for the main body with integrated reinforcement members. The combination of thin polyurethane dividing strips with strategically positioned thicker support members creates a composite system that achieves both high open area (40-46%) and sufficient structural strength for vibratory operation.
2Productivity
If thin dividing strips are used to increase open area, then screening efficiency improves, but structural strength decreases
Solution Approach 1:
The screen is divided into functional zones: thin first and second members (0.0625 to 0.125 inches) provide high open area for efficient screening, while thicker third and fourth members (0.1875 to 0.375 inches) at intersections provide structural reinforcement. This segmentation enables thin strips to achieve high productivity without compromising overall structural strength.
Solution Approach 2:
Different thicknesses are applied locally to different members based on their functional requirements. The first and second members have thin profiles optimized for screening efficiency and open area, while the third and fourth members have increased thickness specifically at intersection points where structural strength is most needed to withstand vibratory forces.
3Stability of the object's composition
If thicker support members are used, then structural stability is improved, but open area percentage decreases
Solution Approach 1:
The support structure is segmented to include only necessary reinforcement at critical locations (third and fourth members at intersections) rather than uniformly thick members across the entire screen. This targeted segmentation provides structural stability where needed while maintaining thin profiles elsewhere to preserve high open area percentage of 40-46%.
Solution Approach 2:
Increased thickness (0.1875 to 0.375 inches) is applied locally only to the third and fourth support members at intersection points where structural stability is most critical for withstanding vibratory loads, while the majority of the screen surface maintains thin dividing strips to maximize open area percentage.
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.