Mining Chain Drive Pin Retention Against Shear and Loosening
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Solution Overview
Problem
Mining chains frequently fail due to breakage of drive pins at the connection between links, primarily caused by shear or breakage under lateral force or contact with mining material, leading to significant downtime and productivity loss.
Innovation Solution
A drive pin retention system using a rubber sandwich pin or steel spring pin that provides positive retention by compressing and expanding within the drive pin hole, or employing a retainer with a castle nut and cotter pin, or using a retainer ring with a plastic seal to securely hold the dowel pin in place, preventing sliding or separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dowel pins are used to retain drive pins, then the retention system is simple in structure, but the drive pins are prone to shear or breakage under lateral force
Solution Approach 1:
The patent employs a composite retention system combining a retainer cap, multiple dowel pins, and a locking mechanism (castor lock or nyloc nut). This composite structure distributes lateral forces across multiple components rather than relying on a single dowel pin, thereby preventing shear failure while maintaining structural simplicity.
2Ease of manufacture
If a single dowel pin is used for retention, then the installation is easy, but the retention strength is insufficient under mining conditions
Solution Approach 1:
The retention function is segmented into multiple components: a retainer cap that provides the primary retention structure, multiple dowel pins (at least two) that distribute retention forces, and a locking mechanism that secures the assembly. This segmentation allows each component to perform its specific function while collectively providing superior retention strength.
3Productivity
If traditional retention systems are used, then the chain assembly is quick, but chain breakage occurs due to drive pin failure
Solution Approach 1:
The retainer cap is pre-formed with holes positioned to receive dowel pins, and the locking mechanism is pre-configured to secure the dowel pins. This preliminary preparation allows for rapid assembly while ensuring that all retention components are properly positioned and secured before the chain is put into service, preventing drive pin failure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new retention system significantly reduces the likelihood of drive pin failure, minimizing downtime and maintaining chain integrity by ensuring secure retention of the drive pins, even under lateral forces and contact with mining material.
Implementation Method 1
A drive pin retention system using a rubber sandwich pin or steel spring pin that provides positive retention by compressing and expanding within the drive pin hole
Implementation Method 2
A drive pin retention system using a rubber sandwich pin or steel spring pin that provides positive retention
Implementation Method 3
employing a retainer with a castle nut and cotter pin, or using a retainer ring with a plastic seal to securely hold the dowel pin in place
Data Source
AI summary
Several embodiments of a drive pin retention system for mining chains comprise a drive pin, dowel pin, and retainer, wherein the dowel pin is fitted through the holes of a retainer aligned with the holes of the dowel pin and pressed with force so that the tolerance between the dowel pin and retainer is very close. In one embodiment, the retainer is tack welded and then the dowel pin is tack welded to further increase the tolerance and prevent loosening or movement of the retainer due to vibration.