Roller Grate Wear-Compensating Stripping Mechanism
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Solution Overview
Problem
Existing roller grates for fine screening face issues with stripping devices made of sheet metal, which have low rigidity, wear quickly, and require complete replacement upon minor wear, limiting service life and maintainability.
Innovation Solution
The roller grate features flat-iron-shaped metal bodies as stripping devices, attached to a carrier device that can be adjusted to compensate for wear, allowing for incremental replacement and improved maintainability, with the metal bodies extending inward to maintain gap spaces between classifying disks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet metal stripping devices are used, then the initial stripping function is achieved, but the service life is reduced due to rapid wear and low rigidity
Solution Approach 1:
The stripping device is divided into multiple individual flat iron-shaped metal bodies, each serving as an independent stripping element. This segmentation allows individual elements to be replaced when worn, extending the overall service life of the stripping device while maintaining structural integrity through the modular design.
Solution Approach 2:
The stripping device combines flat iron-shaped metal bodies with a support device structure, creating a composite system where the metal bodies provide the stripping function and the support device provides structural stability and adjustability, thereby achieving both rigidity and extended service life.
2Ease of repair
If sheet metal stripping devices are used, then the stripping function is provided, but maintainability deteriorates due to complete replacement requirement
Solution Approach 1:
The stripping device is segmented into multiple replaceable flat iron-shaped metal bodies mounted on a support device. This allows individual elements to be replaced independently when worn, significantly improving maintainability without requiring complete device replacement and reducing overall complexity of maintenance operations.
Solution Approach 2:
The support device incorporates height-adjustable mechanisms that allow the stripping elements to be repositioned as they wear down. This dynamic adjustment capability extends the operational life of each element and simplifies maintenance by allowing in-situ adjustment rather than complete replacement.
3Manufacturing precision
If smaller gaps are created between classifying discs, then screening precision is improved, but the stripping elements become weaker due to reduced section modulus
Solution Approach 1:
The stripping device uses flat iron-shaped metal bodies with optimized cross-sectional geometry mounted on a support structure. This composite configuration provides high strength-to-section-modulus ratio, enabling the use of smaller gaps between classifying discs for improved screening precision while maintaining adequate stripping element strength through the efficient structural design.
Data Source
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AI summary
Roller screen (1) comprising a machine frame (2) with a plurality of screen shafts (3) equipped with classifying discs (31) and spacer elements (33), which are arranged one behind the other in the longitudinal direction (23) of the machine frame (2) and are rotatably mounted on the machine frame (2), wherein each screen shaft (3) is assigned a support device (5) which is arranged below the respective screen shaft (3) and to which at least one scraper device (7) is attached, wherein the at least one scraper device (7) is formed by a plurality of flat iron-shaped metal bodies (71),wherein each gap space (35) formed between adjacent classifying discs (31) by a spacer element (33) is assigned a flat iron-shaped metal body (71) and wherein the flat iron-shaped metal bodies (71) are designed to be positioned vertically extending from the respective support device (5) into the gap spaces (35) of the sieve shafts (3) formed by adjacent classifying discs (31).