Screening Module Protrusion Grid for Blinding Resistance
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Solution Overview
Problem
In particulate material screening, there is a trade-off between the flexibility of the screening panel, screening accuracy, and open area, where high flexibility can lead to oversized particles passing through apertures, while high open area can result in reduced stiffness and increased flexibility, causing blinding or pegging issues.
Innovation Solution
A screening module with a frame component and a screening panel featuring a support structure with protrusions that define apertures, where the protrusions are tapered and arranged in a grid or lattice pattern to inhibit blinding and pegging, and the support structure has larger openings than apertures, allowing for increased open area and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screening panel is made more flexible to inhibit blinding or pegging of screening apertures, then the resistance to blinding is improved, but oversized ore particles may pass through the apertures reducing screening accuracy
Solution Approach 1:
The screening panel is segmented into a rigid support structure and separate protrusions. The support structure provides rigidity to prevent oversized particles from passing through, while the protrusions provide flexibility to inhibit blinding. This segmentation allows each component to fulfill its specific function without compromising the other.
Solution Approach 2:
Different parts of the screening panel have different mechanical properties. The support structure is made rigid to maintain aperture geometry and prevent particle passage, while the protrusions are made flexible to adapt to material flow and prevent blinding. This local differentiation of mechanical properties resolves the contradiction between rigidity and flexibility requirements.
2Productivity
If the open area of the screening panel is increased to allow maximum throughput, then the productivity is improved, but the panel becomes too flexible allowing oversized particles to pass through
Solution Approach 1:
The panel is divided into a rigid support structure that maintains structural integrity and screening accuracy, and flexible protrusions that adapt to material flow. This segmentation enables the support structure to prevent oversized particle passage even when open area is increased, while the protrusions maintain flexibility to handle high throughput volumes.
Solution Approach 2:
The screening panel combines materials or structural elements with different mechanical properties - a rigid support structure (which could be metal or rigid polymer) and flexible protrusions (which could be elastomeric material). This composite construction allows the panel to simultaneously achieve high open area for throughput and sufficient rigidity for accurate screening.
3Manufacturing precision
If the screening panel is made more rigid to prevent oversized particles from passing through, then the screening accuracy is improved, but the panel becomes prone to blinding or pegging of apertures
Solution Approach 1:
The rigid support structure and flexible protrusions are segmented as separate functional elements. The rigid support structure ensures screening accuracy by maintaining aperture geometry and preventing oversized particle passage, while the flexible protrusions independently provide blinding resistance by adapting to material flow and preventing material buildup.
Solution Approach 2:
The panel exhibits local quality differentiation where the support structure is rigid for structural stability and the protrusions are flexible for anti-blinding performance. This local variation in mechanical properties allows the panel to simultaneously achieve high screening accuracy and resistance to blinding without compromise.
Data Source
AI summary
A screening module 10 comprises a frame component 12 to be secured to an underlying screen deck, in use. A screening panel 14 is carried by the frame component 12. The screening panel 14 comprises an operatively upper screening surface 16 and a support structure 18 underlying the screening surface 16 with a plurality of spaced protrusions 20 being supported by and standing proud of the support structure 18. Operatively upper ends of the protrusions 20 lie substantially in a plane of the screening surface 16 and the protrusions 20 define a plurality of screening apertures 22 in the screening surface 16.