Screening Media With Asymmetric Polygonal Apertures
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Solution Overview
Problem
Conventional screening media in vibratory separators often experience 'blinding' due to material lodging in apertures, leading to inefficient screening and downtime, as particles tend to get stuck or miss passing through holes, especially at high material flow speeds.
Innovation Solution
The use of non-regular polygon openings oriented such that the most proximal interior angle is divided by a line parallel to the material flow direction, creating a plow-shaped bank that guides particles to alter their path and increase the likelihood of passing through, along with slight expansion of regular polygon openings to accommodate larger particles without contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional screening media with regular aperture shapes is used, then the structure is simple and easy to manufacture, but the apertures easily get blinded by material lodging leading to inefficient screening
Solution Approach 1:
The patent applies asymmetry by using non-regular polygonal aperture shapes instead of conventional regular shapes. The apertures have varying side lengths and internal angles, creating asymmetric geometries that prevent material particles from lodging and blocking the openings. This asymmetric design ensures that particles cannot align with the aperture edges in a way that causes blinding, thereby maintaining screening efficiency over extended periods.
Solution Approach 2:
The patent implements local quality by varying the geometric properties of different apertures across the screening media. Each aperture can have different internal angles and side configurations optimized for specific particle sizes and material characteristics. This localized optimization allows different regions of the screening media to handle different particle types effectively, preventing universal blinding issues.
2Productivity
If conventional rectangular apertures are used, then manufacturing is simple, but particles tend to get stuck or miss passing through holes at high material flow speeds
Solution Approach 1:
The non-regular polygonal apertures create asymmetric entry and exit paths for particles. The varying internal angles and side lengths ensure that particles approaching at high speeds have multiple potential passage routes rather than a single rectangular opening they might miss or get stuck in. This asymmetric geometry increases the probability that particles will successfully pass through even at high flow rates.
Solution Approach 2:
The aperture design incorporates preliminary action by creating leading edges and guiding surfaces that direct particles toward the aperture opening before they reach it. The non-regular polygon shape provides natural guidance paths that steer particles into the aperture, reducing the likelihood of particles missing the opening or getting stuck at the entrance.
3Duration of action of stationary object
If screening media operates for extended periods, then productivity is maintained, but holes become clogged requiring downtime for brushing
Solution Approach 1:
The asymmetric non-regular polygonal aperture shapes prevent material from lodging in consistent patterns that would lead to progressive blinding. The varying geometries ensure that particles cannot settle into stable blocking positions, allowing the screening media to maintain open apertures and high screening efficiency over extended continuous operation periods without requiring brushing or downtime.
4Productivity
If regular polygon openings are slightly expanded, then larger particles can pass through more easily, but particle contamination may increase
Solution Approach 1:
The non-regular polygonal shapes with varying side lengths and angles provide size-based filtering while maintaining passage efficiency. The asymmetric geometries create effective aperture dimensions that allow targeted particle sizes to pass while blocking larger particles, even when the overall aperture area is expanded. This prevents contamination by ensuring that size separation precision is maintained despite increased passage rate.
Data Source
AI summary
Screening media for screening material includes a main body and a plurality of openings extending through the main body between a contact face and back face. The openings are of a shape of a convex and non-regular polygon, and are arranged in an orientation such that a line through the most proximal vertex of the polygon and parallel to a defined material flow direction divides the most proximal interior angle of the polygon. Such a configuration allows the openings to not easily get pegged and to improve screening performance.