Arc-Shaped Tine Rake for Agitating Screen Debris Removal
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Solution Overview
Problem
Conventional rakes for mechanical screening buckets wear out quickly and fail to effectively scrape debris from agitating screens, especially when dealing with wet, sticky, or fine materials, and lack adaptability to varying disc surfaces.
Innovation Solution
A rake assembly with arc-shaped tines that correspond to the circular disc spacers between agitating discs, allowing for engagement and reducing wear by 'floating' and moving with the discs, thereby improving debris removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional straight rectilinear tines are used to scrape debris from agitating screens, then debris removal function is provided, but the tines wear out quickly and break
Solution Approach 1:
The patent applies curvature by replacing straight rectilinear tines with arc-shaped tines that match the circular geometry of disc spacers. The arc-shaped surface of each tine corresponds to the arc shape of the circular disc spacer, enabling the tine to engage and scrape debris effectively while distributing wear across the curved surface, thereby improving both durability and debris removal effectiveness
Solution Approach 2:
The patent changes the geometric parameter of the tine from straight to arc-shaped, matching the curvature radius to correspond with the disc spacer dimensions. This parameter change allows the tine to float and move with the discs during operation, reducing stress concentration and wear while maintaining effective debris scraping capability
2Adaptability or versatility
If conventional straight tines are used, then simple structure is maintained, but the tines cannot compensate for variations in disc surfaces
Solution Approach 1:
The arc-shaped tine design inherently provides adaptability to disc surface variations by matching the circular geometry of the disc spacers. The curved surface allows the tine to conform to slight variations in disc positioning and surface irregularities, improving adaptability without requiring complex adjustment mechanisms or additional components
Data Source
AI summary
A rake assembly for use with an agitating screen of a mechanical screening bucket is provided. The rake assembly may include a rake bar and a plurality of tines coupled to the rake bar. Each tine may include a first end comprising an arc shaped surface, wherein the arc shaped surface is configured to engage a circular disc spacer between agitating discs of an agitating shaft of an agitating screen. The arc shaped surface corresponds to an arc shape of the circular disc spacer. Each tine may further include a second end opposite the first end, wherein the second end may include a notch formed therein. Each tine may be coupled to the rake bar by the notch. The rake assembly scrapes debris stuck in the agitating shafts in response to operation of the agitating screen.