Woven Wire Screening Weft Wire Design for Wear Resistance
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Solution Overview
Problem
Existing self-cleaning woven wire screens have limited weft wire diameter and thickness, leading to premature wear and deformation during manufacturing, which shortens their operational life and requires protective encasements that restrict relative movement and increase costs.
Innovation Solution
The design features weft wires with increased diameter, thickness, or cross-sectional height, specifically by flattening other portions to prevent deformation and eliminate the need for polyurethane blocks, allowing for larger high points or raised knuckles that maintain relative movement between warp wires, thus extending the screen's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If larger diameter weft wires are used to extend screen life, then operational life is improved, but the wires deform during manufacturing process
Solution Approach 1:
The weft wire is divided into two distinct sections: a first section with a larger diameter that forms the high point or raised knuckle, and a second section with a smaller diameter that extends to the ends of the wire. This segmentation allows the high point to be sufficiently large to extend operational life while the smaller second section prevents deformation during the manufacturing process.
Solution Approach 2:
Different sections of the same wire element are given different diameters to serve different functions. The first section (high point) has a larger diameter optimized for wear resistance and operational life, while the second section has a smaller diameter optimized for manufacturing compatibility. This local quality differentiation resolves the contradiction between size requirements for longevity and size constraints for manufacturability.
2Reliability
If polyurethane blocks are used to protect weft wire high points, then wear resistance is improved, but relative movement between warp wires is restricted
Solution Approach 1:
The invention extracts and eliminates the polyurethane blocks from the screen structure. Instead of adding protective encasements, the solution uses the wire's own geometry (the two-section design with a naturally formed high point) to achieve wear resistance while maintaining the necessary relative movement between warp wires for self-cleaning functionality.
Solution Approach 2:
The weft wire structure itself provides the wear protection through its geometric design (the larger diameter first section forming a high point), eliminating the need for separate protective components like polyurethane blocks. This self-service approach maintains wear resistance while preserving operational flexibility.
3Reliability
If polyurethane blocks are used to protect weft wires, then wear resistance is improved, but device complexity and cost increase
Solution Approach 1:
The invention removes the polyurethane blocks and associated binding structures from the design. The protective function is achieved through the inherent geometry of the two-section weft wire itself, significantly reducing device complexity and eliminating additional materials and assembly steps.
Solution Approach 2:
The two-section weft wire structure serves multiple functions simultaneously: the first section provides wear-resistant protection as a high point, while the second section provides structural integrity and manufacturing compatibility. This multi-functionality eliminates the need for separate protective components, reducing overall device complexity.
Data Source
AI summary
A self-cleaning woven wire screening or screen for classifying material. The screening includes a plurality interwoven warp and weft wires forming a plurality of openings in a screen section through which materials to be classified can pass through. The weft wires are preferably configured so that the high points or raised knuckles of the weft wires have a larger diameter, cross-sectional height or thickness than previously possible. Preferably, one or more of weft wires have a configuration that prolongs operational life of the screen or screening and obviates the need for protective encasement blocks (e.g., polyurethane encasement blocks) encasing the weft wires.