Cutting Chain Debris Trap and Anti-Rotation Fastener Design
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Solution Overview
Problem
Concrete cutting chains experience rapid deterioration due to abrasive debris and water, leading to wear and stretching issues as debris enters the chain linkages, causing friction and improper engagement with the sprocket, which results in chain failure.
Innovation Solution
The cutting chain design incorporates a debris trap mechanism using annular ribs and grooves around the holes of the center and side links to prevent debris from reaching the bearing surfaces, combined with rotation-resistant fasteners to prevent fastener rotation relative to the side links, thereby reducing wear and stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the cutting chain operates under harsh conditions with water flushing, then debris is removed from the cutting surface, but debris still enters the chain linkages causing wear and stretching
Solution Approach 1:
The patent introduces an intermediary structure (debris trap formed by annular ribs and grooves) between the external environment and the bearing surfaces. This intermediary captures debris before it can reach the critical bearing surfaces, resolving the contradiction by allowing water flushing to continue while blocking debris entry paths to the linkages.
Solution Approach 2:
The chain linkage is segmented into functional zones: the debris trap zone (annular ribs and grooves) that captures debris, and the protected bearing surface zone. This segmentation allows the system to handle debris separately from the cutting operation, maintaining reliability while preserving the effectiveness of water flushing.
2Speed
If debris enters the bearing surfaces, then friction is reduced for smooth operation, but wear increases causing chain stretching
Solution Approach 1:
The patent converts the harmful effect of debris into a beneficial containment function. By designing annular ribs and grooves that intentionally capture and hold debris, the system prevents debris from causing wear on bearing surfaces. The debris is trapped in a controlled environment where it cannot harm the chain, thus extending service life while maintaining operational smoothness.
3Ease of manufacture
If fasteners are allowed to rotate relative to side links, then friction is reduced for easier assembly, but wearing and stretching of side links occurs
Solution Approach 1:
The patent incorporates preliminary anti-rotation features (protrusions or depressions) on the fasteners and side links during manufacturing. These features are pre-configured to prevent rotation once the fastener is assembled, eliminating the need for additional anti-rotation measures while protecting side links from wear and stretching during operation.
4Device complexity
If the chain structure is simplified without anti-rotation members, then manufacturing is easier, but wear and stretching of side links increases
Solution Approach 1:
The patent merges the fastener function with the anti-rotation function by integrating protrusions or depressions directly into the fastener and side link structures. This combination eliminates the need for separate anti-rotation components, maintaining structural simplicity while ensuring side link durability through prevention of fastener rotation.
Data Source
AI summary
A cutting chain for cutting concrete and other similar materials having wear and stretch resistant features. In one embodiment, the cutting chain can include chain links having a debris trap for hindering the entry of debris onto bearing surfaces. In one embodiment, side links and a center link can have cooperating members forming a maze-like debris trap and can include a lubricant and/or other barrier material. In a particular arrangement, side links can have annular ribs which can be partially received in annular grooves on a center link to create the maze-like debris trap. In another embodiment, the cutting chain can include chain links having anti-rotation structures to hinder rotation of the fastener relative to the side links. In a particular arrangement, side links can have a protrusion or slot for cooperating with a complementary mating slot or protrusion on the fastener. In another particular arrangement, the side links can have ridges in the fastener receive hole for penetrating the shaft of the fastener to resist rotation thereof.