Polyurethane Vibratory Screen Bi-Directional Grid
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Solution Overview
Problem
Molded polyurethane screens with large dividing strips result in low open area percentages, leading to inefficiencies in vibratory screening applications.
Innovation Solution
A vibratory screen design featuring a flexible molded polyurethane body with thinner first and second members forming screening openings, and thicker third and fourth members with integral reinforcement, providing a high amplitude of vibration and increased open screening area through a bi-directional support grid structure.
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 applies local quality by varying the thickness of different members within the screen structure. Third and fourth members (support members) have a greater thickness to provide structural strength, while first and second members (dividing strips) have a smaller thickness to maximize open area. This localized differentiation of thickness allows each component to fulfill its specific function optimally.
Solution Approach 2:
The patent employs composite materials by integrating reinforcement members (such as wires or fibers) within the polyurethane matrix of the support members. This composite structure enhances the structural strength and vibration resistance of the thicker third and fourth members, allowing them to maintain rigidity without increasing their thickness, thereby preserving the high open area percentage.
2Productivity
If thinner dividing strips are used to increase open area, then screening efficiency is improved, but structural integrity deteriorates
Solution Approach 1:
The patent resolves the structural integrity issue by transitioning from a one-dimensional thickness parameter to a two-dimensional reinforcement approach. While first and second members remain thin in the screening plane to maintain high open area, third and fourth support members incorporate reinforcement members that extend through the structure, providing strength in the vertical and lateral dimensions without compromising the thin profile of the dividing strips.
3Ease of manufacture
If uniform thickness members are used, then manufacturing simplicity is maintained, but vibration amplitude is reduced
Solution Approach 1:
The patent applies parameter changes by varying the thickness parameter across different members of the screen structure. First and second members have a first thickness optimized for vibration amplitude, while third and fourth members have a greater second thickness for structural support. This parameter differentiation enables high vibration amplitude in the dividing strips while maintaining overall structural integrity through the thicker support members.
Data Source
Figure 1~2
Figure 1A
Figure 1B
AI summary
A molded polyurethane vibratory screen (10) including a body (12 having opposite side edge portions (14, 16), upper (20) and lower (18) edge portions, an upper surface (22) and a lower surface (24), first members (101) extending between the side edge portions (14, 16) and the second members (102) extending between the lower edge portion (18) and the upper edge portion (20), third members (203) substantially parallel and extending transversely between the side edge portions (14, 16) and having multiple first members (101) therebetween, the fourth members (204) substantially parallel and extending transversely between the lower edge portion (18) and the upper edge portion (20) and having multiple second members (102) therebetween, reinforcement members (50) molded integrally with the third (203) and fourth (204) members.