Split Hub Disc with Flexible Strap for Screen Maintenance
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Solution Overview
Problem
Disc screens used for separating particulate materials face challenges in conveniently removing and replacing worn-out discs, as existing methods require dismounting multiple discs and are tedious, especially when only one disc needs replacement.
Innovation Solution
A disc construction featuring a hub with a split and a flexible, C-shaped strap acting as a living hinge, allowing transverse mounting and removal over a shaft without axial sliding, secured by a releasable fastener and locating pins for alignment, simplifying the process of disc replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If discs are mounted on shafts using traditional sliding methods, then the discs can be securely attached, but the removal and replacement process becomes tedious and time-consuming
Solution Approach 1:
The disc is divided into two separate halves that can be independently manipulated. This segmentation allows the disc to be opened like a clamshell, enabling easy removal from the shaft without sliding, and facilitates quick replacement by simply closing the halves around the shaft again.
Solution Approach 2:
The mounting mechanism transitions from axial sliding (one-dimensional) to transverse opening/closing (two-dimensional). The split disc design allows movement in the radial dimension, enabling the disc to be opened perpendicular to the shaft axis for easy installation and removal.
2Ease of repair
If multiple discs must be removed to access a single damaged disc, then the damaged disc can be replaced, but the complexity and time of the replacement process increases
Solution Approach 1:
The disc is segmented into two halves that can be independently removed from the shaft. This allows individual disc replacement without affecting adjacent discs, as each half can be detached separately while leaving other discs intact on the shaft.
Solution Approach 2:
The damaged disc can be extracted from the shaft independently by opening its two halves, without needing to remove other discs. The split design enables selective removal of only the problematic disc while maintaining the integrity and position of surrounding discs.
3Reliability
If traditional disc mounting methods are used, then discs can be securely attached to shafts, but the risk of damaging bearings or shafts during installation increases
Solution Approach 1:
The installation process moves from axial sliding (which requires force along the shaft length and risks bearing damage) to transverse placement (where the disc is simply lowered onto the shaft from the side). This dimensional change eliminates the risk of impacting bearings during installation.
Solution Approach 2:
Instead of sliding the disc onto the shaft end (traditional method), the disc is inverted in approach: the two halves are opened wide, the shaft is inserted through the opening, and then the halves are closed around it. This reverse approach prevents bearing damage during installation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces the complexity and time required for disc replacement, saving materials and minimizing the risk of damaging bearings or shafts, while allowing for quicker installation and repair of individual discs within a disc screen assembly.
Implementation Method 1
A flexible, generally C-shaped strap is embedded in the elastomeric material of the hub with opposite ends adjacent the respective opposing ends of the hub. A portion of the hub which is diametrically opposite the split flexes to allow the opposite ends at the split to be spread apart, acting as a living hinge.
Data Source
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AI summary
A disc for releasable attachment to a shaft of a disc screen apparatus includes a hub having a bore and a single split defining a pair of opposing ends. The hub also has at least one flexible portion intermediate the opposing ends that permits the opposing ends of the hub to be separated a predetermined distance sufficient to allow the shaft of the disc screen apparatus to pass between the opposing ends into the bore. The hub has plurality of outer impacting portions configured for engaging materials to be classified and propelling the materials in a conveying direction when the hub is rotated. A mechanism is provided to secure the hub to the shaft so that the shaft extends through the bore.