Excavation Chain Link Concave Guide Surface Wear Reduction
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Solution Overview
Problem
Excavation chains used in ballast clearing devices for railway tracks face significant wear, particularly at return members and inner link sides, leading to premature degradation and increased maintenance needs.
Innovation Solution
The design of a link for the excavation chain featuring a concave guide surface on its interior side that matches the curvature of return members, along with convex surfaces and strategically positioned through holes, reduces wear and stabilizes the link during movement, enhancing the chain's durability and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the excavation chain uses conventional link design with flat inner surfaces, then the structure is simple and easy to manufacture, but the wear on links and return members is severe leading to premature degradation
Solution Approach 1:
The patent applies local quality by introducing a concave guiding surface specifically at the inner side of the link body where it contacts the return member. This localized geometric modification concentrates the wear-resistant properties exactly where the friction and impact occur, while the rest of the link maintains its conventional simple structure for ease of manufacture.
Solution Approach 2:
The patent employs curvature by designing the inner guiding surface of the link as a concave curved surface that matches the curvature of the return member. This curved geometry distributes contact pressure more evenly and reduces stress concentration compared to a flat surface, thereby reducing wear and extending chain lifespan.
2Reliability
If the link body has a concave guiding surface matching return member curvature, then wear on links and return members is reduced, but the link structure becomes more complex
Solution Approach 1:
The concave guiding surface is introduced only at the specific location where the link contacts the return member, applying wear-resistant geometry locally rather than throughout the entire link structure. This minimizes the increase in overall structural complexity while maximizing wear resistance at the critical contact zone.
Solution Approach 2:
The concave curved surface is designed to match the curvature of the return member, creating a complementary fit that reduces point contact stress. This curvature-based design achieves superior wear resistance through geometric optimization rather than material changes or additional components.
3Ease of manufacture
If conventional flat link design is used, then manufacturing is simpler, but noise during chain movement is higher
Solution Approach 1:
The concave curved guiding surface creates a smoother contact interface with the return member, reducing impact and friction during movement. This curved geometry minimizes sudden jerks and vibrations that generate noise, providing a quieter operation compared to flat-surfaced links.
4Productivity
If the chain operates with high speed for efficient ballast transport, then productivity increases, but wear on components accelerates
Solution Approach 1:
The concave curved surface distributes contact forces more evenly during high-speed operation, reducing peak stresses and wear rates. This allows the chain to maintain high productivity while extending component durability through reduced mechanical degradation per unit of work.
Data Source
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Figure 5
AI summary
Disclosed is a link (100) for a removal chain (8) for a ballast removal device (4) below a railway track (2), the link (100) comprising a member (101) that extends longitudinally between a front end (110) and a rear end (120) and is penetrated by at least one front through-hole (111) and a rear through-hole (121), said through-holes being designed to receive means hinging the link (100) to an adjacent link of the chain (8), the front through-hole (111) and the rear through-hole (121) extending along mutually parallel axes that are located in a reference plane (P) of the member (101), the link (100) further comprising an inner side (100B) of the member (101) with respect to the reference plane (P), the inner side (100B) lying opposite the outer side (100A), a concave guide surface (150) extending along an envelope (155) having an axis generatrix (G) running parallel to the axes of the hinge points (A1, A2) of the link, the guide surface (150) being designed to at least locally match a curvature (C) of a return member (40) of the removal device (4).