Single-Piece Cast Equalizer for Mining Shovel Rope Wear
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Solution Overview
Problem
Conventional rope mining shovels face issues with wear on hoist ropes and cumbersome assembly processes due to the use of large, bulky equalizers, which result in increased weight, reduced cutting force, and higher payloads.
Innovation Solution
A single-piece cast equalizer with cylindrical ends and end caps that securely couple to the dipper, reducing weight and simplifying assembly by eliminating the need for additional pins, while providing a sacrificial shield to protect against sheave contact and guiding ropes to minimize wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional large and bulky equalizers are used, then the equalizer provides sufficient structural strength and protection, but the weight increases and cutting force is reduced
Solution Approach 1:
The equalizer undergoes a parameter change in its structural configuration, transitioning from a conventional bulky design to a tubular configuration with integrated end caps. This parameter change maintains structural strength through the tubular geometry and integrated coupling mechanisms while significantly reducing weight by approximately 50% compared to traditional equalizers.
2Strength
If conventional equalizers with multiple components are used, then the equalizer provides robust construction, but the assembly process becomes cumbersome and time-consuming
Solution Approach 1:
The equalizer integrates multiple components into a single unified structure. The tubular equalizer body is integrated with end caps that incorporate bushings and coupling features, eliminating the need for separate pins and multiple assembly steps. This merging of components maintains robust construction while dramatically simplifying the assembly process.
3Reliability
If conventional equalizers are used, then the equalizer provides adequate rope guidance, but wear on hoist ropes increases due to misalignment
Solution Approach 1:
The end caps integrated into the tubular equalizer serve as intermediary elements that provide precise rope guidance. The bushings within the end caps act as mediators between the hoist rope and the equalizer structure, ensuring proper alignment and tangency to the boom sheave. This intermediary function reduces rope wear while maintaining reliable rope guidance.
4Reliability
If conventional equalizers are used, then the equalizer provides sufficient protection against sheave contact, but the overall payload increases
Solution Approach 1:
The tubular equalizer structure functions as a flexible yet protective shell that shields against sheave contact. The tubular geometry provides protective coverage while using thinner wall sections compared to conventional bulky equalizers, reducing weight by approximately 50% while maintaining adequate protection against sheave contact.
Data Source
AI summary
An equalizer assembly for a mining machine includes a single piece cast equalizer having a first end and a second, opposite end. The assembly also includes a first end cap configured to be coupled to a dipper of the mining machine, the first end cap including a first bushing configured to receive the first end of the equalizer. The assembly also includes a second end cap configured to be coupled to the dipper of the mining machine, the second end cap including a second bushing configured to receive the second end of the equalizer.