Conveyor Chain Pin Shoulder and Bar Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conveyor chains for continuous miners and chain haulage units face issues with axial motion of pins, leading to relative motion between side plates and pins, which complicates field installations and maintenance, and existing solutions like heavier press fits increase maintenance difficulties while compromising chain flexibility.
Innovation Solution
The introduction of a shoulder on the pins to engage with side plates and prevent them from moving towards each other, combined with a bar or structure extending between side plates to prevent movement away from each other, facilitates easier field assembly and maintenance by stabilizing the chain links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavier press fits are used to prevent pin movement, then reliability improves, but ease of manufacture deteriorates and device complexity increases
Solution Approach 1:
The pin is segmented into multiple functional zones: a press-fit section for retention, a shoulder section for positioning, and a protrusion section for drive engagement. This segmentation allows each section to be optimized independently, providing reliable pin retention through press-fit while enabling easier field assembly through the positioning shoulder that guides proper installation.
Solution Approach 2:
Different sections of the pin have different geometric properties tailored to specific functions. The press-fit section has a diameter matching the side plate hole for secure retention, the shoulder has a larger diameter for positioning and preventing over-insertion, and the protrusion has specific geometry for drive engagement. This local differentiation resolves the contradiction by providing reliable retention where needed while simplifying assembly through self-positioning features.
2Adaptability or versatility
If swivel links are designed with interior space filled with swivel pin and lugs, then flexibility improves, but ease of operation deteriorates due to inability to sprocket-drive on interior
Solution Approach 1:
The drive engagement moves from interior swivel link space to the exterior dimension. The pin protrudes beyond the side plate outer surface, allowing drive sprockets to engage the pin exterior rather than requiring interior space. This dimensional shift enables both swivel link flexibility (interior filled with swivel pin and lugs) and sprocket drive capability (exterior engagement) to coexist.
Solution Approach 2:
The pin serves as an intermediary element that connects the interior swivel mechanism with the exterior drive system. The pin's protrusion beyond the side plate creates an interface zone where drive sprockets can engage the pin exterior while the pin interior accommodates the swivel mechanism, thereby mediating between the flexibility requirement and the drive capability requirement.
3Ease of operation
If drive pins extend beyond side plates for sprocket engagement, then ease of operation improves, but object-generated harmful factors worsen due to potential pin bending and snagging
Solution Approach 1:
The pin design includes preventive features that counteract potential harmful effects before they occur. The shoulder prevents excessive insertion that could lead to bending, while the controlled protrusion length and geometry are designed to minimize snagging risks. The press-fit section prevents excessive movement that could cause bending under load, thereby preliminarily counteracting the harmful effects of pin bending and snagging.
Solution Approach 2:
The pin geometry parameters are optimized to balance drive engagement requirements with resistance to bending and snagging. The protrusion length, diameter, and shape are specifically designed to provide sufficient exterior engagement for sprockets while minimizing exposure to conditions that cause bending and snagging. This parameter optimization resolves the contradiction between ease of operation and harmful factors.
Data Source
AI summary
A chain driven by two sprockets spaced a short distance apart along their common axial centerline. The chain includes elongated pins that extend beyond the outer surfaces of the chain link plates, on both sides, by a distance about equal to the width of the spaced apart sprockets. The chain is aligned midway between the sprockets, and the sprocket teeth drive on the extended portion of the chain pins. Where a flight is attached to the chain links, the pins are extended still further, to fit into the indentations or holes in the flights. This provides an exposed length of each pin in alignment with the sprocket on each side for driving purposes. The chain has a piece extending between the plates to reduce the likelihood of a pin extending further outside of one side plate or the other. A shoulder on the pin further reduces the likelihood of this happening.