Helical Disc Screen for Material Recycling
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Solution Overview
Problem
Existing disc screens for material recycling have inefficiencies due to uniform disc diameters leading to limited lateral agitation, resulting in underutilization of screen edges and material becoming pinched in unintended gaps, which reduces sorting efficiency.
Innovation Solution
A disc design with a helical ridge that undulates along its length, allowing for continuous and non-stepwise diameter change between outer peripheral ridges, promoting lateral movement and preventing material pinching, and can be made from different materials with textured surfaces for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discs of the same diameter are used in a disc screen, then the structure is simple and easy to manufacture, but lateral agitation is limited and screen edges are underutilized
Solution Approach 1:
The disc incorporates a helical ridge that creates local variations in diameter along the disc length, with the outer peripheral ridge having a different diameter than the inner portions. This local quality change enables lateral agitation and utilizes the entire screen width while maintaining overall structural simplicity
Solution Approach 2:
The helical ridge introduces a curved, three-dimensional surface to the disc structure, transforming the flat cylindrical shape into a contoured form that promotes material movement and enhances screen utilization without significantly complicating manufacturing
2Productivity
If discs of varying diameters are used to create lateral agitation, then screen utilization improves, but unintended gaps are created where material becomes pinched
Solution Approach 1:
The helical ridge creates a continuous curved surface that gradually transitions in diameter, eliminating abrupt step changes. This curvature ensures material follows a smooth path without becoming pinched in unintended gaps, while still providing the lateral agitation needed for full screen utilization
Solution Approach 2:
The helical ridge design creates dynamic material movement patterns during disc rotation, with material being continuously agitated and redirected along the helical path. This dynamic action prevents material from becoming trapped in static gaps while maintaining reliable operation
3Productivity
If a helical ridge with continuous diameter change is implemented, then lateral agitation is enhanced and material pinching is prevented, but manufacturing complexity increases
Solution Approach 1:
The helical ridge, while creating a complex three-dimensional surface, can be manufactured using standard forming and machining techniques. The continuous curved geometry, though more complex than a flat disc, remains within practical manufacturing capabilities and does not require advanced or specialized processes
Data Source
AI summary
A disc for use in a disc screen is disclosed that creates an “intended space”—i.e., the designed space through which material is intended to pass—that undulates in both directions in the plane defined by the screen's rotatable shafts. The disc design includes a major axis that is rotated along the length of the shaft, creating a helical ridge. The ridge is continuous and non-stepwise, thereby avoiding the “pinch” of the prior art designs. And by having the helical ridge of adjacent discs on the same shaft with opposing rotations, the lateral movement of material may alternate along the length of the shaft—further spreading the material throughout the width of the disc screen and increasing the screen's efficiency.