Investment-Cast Chain Link Geometry to Prevent Debris Catching
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Solution Overview
Problem
Existing chain links in municipal and industrial water and wastewater treatment systems, as well as grain and material handling conveyors, suffer from debris collection and contact with equipment surfaces, leading to equipment failures and unscheduled outages.
Innovation Solution
A stainless-steel chain link design featuring offset sidebars, a continuous recessed reinforcing rib, and a rotatable or non-rotatable chain pin connection system, produced through investment casting, which minimizes debris collection and prevents contact with equipment surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chain links with linear edges and parallel sidebars are used, then manufacturing is simpler, but debris collects on the links and causes equipment failures
Solution Approach 1:
The patent applies curvature by replacing linear edges with curved surfaces on the chain link sidebars. The curved geometry eliminates sharp corners and flat surfaces where debris can accumulate, making the chain link self-cleaning as it moves through the equipment. This curved design directly addresses the reliability issue by preventing debris collection while maintaining manufacturability through investment casting processes.
2Reliability
If chain links with protruding features and flat surfaces are used, then structural strength is adequate, but contact with equipment surfaces causes catching and failures
Solution Approach 1:
The curved sidebar design eliminates protruding flat surfaces that contact equipment walls. The continuous curved surface allows the chain link to pass smoothly through equipment without catching on surfaces, thereby maintaining operational continuity while the investment casting process ensures adequate structural strength is achieved.
Solution Approach 2:
The patent changes the geometric parameters of the chain link from linear to curved surfaces. This parameter change modifies the interaction between the chain link and equipment surfaces, preventing catching and contact issues while maintaining the structural integrity required for operational reliability.
3Reliability
If investment casting process is used to create curved geometry, then debris collection is eliminated, but manufacturing complexity increases
Solution Approach 1:
The patent merges the curved geometry design with the investment casting manufacturing process. The curved surfaces are integrated into the chain link structure from the beginning, and the investment casting process is selected specifically because it can efficiently produce these complex curved geometries. This combination eliminates debris collection issues while managing manufacturing complexity through process-selection alignment.
Data Source
AI summary
An investment cast, stainless steel chain link for use a part of a chain. The chain link includes a pair of spaced first and second sidebars that each extend between forward and rear ends of the chain link. A reinforcing rib is formed on each sidebar and is flush with the forward and rear ends of the chain link. A barrel is formed at the rear end of the sidebars. The forward end of the sidebars includes either a first or a second attachment boss. The first attachment boss includes a pin head receptacle that allows the head of the chain pin to be flush with an outer surface of the first attachment boss. A retaining pin extends through the second attachment boss to prevent axial movement of the chain pin. In one embodiment, the chain pin is rotatable and, in another embodiment, the chain pin is prevented from rotating.