Variable Interfacial Opening Disc Screen for Material Sorting

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Solution Overview

Problem

Disc and roll screens in material sorting systems often jam due to material accumulation, leading to mechanical shock and premature failure of the sorting system's assemblies and drive mechanism.

Innovation Solution

A disc screen design featuring a variable interfacial opening (IFO) between rotating discs, where the width and length of the IFO change with rotational position, allowing for adjustable disc spacing and reducing material adhesion and jamming by varying the disc space and contact surface width.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If material sorting systems use fixed disc spacing, then the structure is simple and easy to manufacture, but material jams between the disc and shaft causing mechanical shock and system failure

Engineering Contradiction:

Improvesystem reliabilityVSAvoiddisc spacing mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The disc spacing mechanism is made dynamic by allowing the disc to move radially relative to the shaft through an adjustable mechanism. This enables the spacing between the disc and shaft to be varied, preventing material accumulation and jams that occur with fixed spacing, thereby improving system reliability without requiring overly complex mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The critical parameter of disc-to-shaft spacing is made adjustable rather than fixed. By allowing this parameter to be changed based on material characteristics and operating conditions, the system can optimize performance and prevent jamming while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If disc contact surface width is constant, then manufacturing is easier, but material adhesion and jamming increase reducing sorting efficiency

Engineering Contradiction:

Improvesorting efficiencyVSAvoiddisc fabrication

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The disc contact surface is designed with non-uniform width, where different radial positions have different contact surface widths. This local variation in geometry allows material to be effectively sorted while reducing adhesion and jamming in critical areas, improving productivity without requiring extremely complex manufacturing processes.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The contact surface width is made variable through the adjustable disc positioning mechanism, allowing the effective contact width to change dynamically based on operating conditions, thereby optimizing sorting efficiency while preventing material accumulation.

Inventive Principle:

Principle #15Dynamics

3Strength

If uniform disc spacing is used, then the device structure is simpler, but material accumulation occurs leading to mechanical shock and premature failure

Engineering Contradiction:

Improvemechanical durabilityVSAvoidvariable spacing mechanism

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The adjustable spacing mechanism acts as a preventive measure by allowing operators to set optimal disc-to-shaft clearance before operation begins. This prevents material accumulation and the resulting mechanical shocks that would otherwise lead to premature failure of mechanical components.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS8991616B2Material sorting discs with variable interfacial opening

Publication Date: 2015.03.31 EMERGING ACQUISITIONS LLC

AI summary

A disc screen includes a shaft, a first disc mounted on the shaft, and a second disc mounted on the shaft. An interfacial opening (IFO) extends between the first disc and the second disc. A width of the IFO as measured between the first disc and the second disc varies according to a rotational position of the shaft.