Removable Liner Assembly for Mining Dipper Wear Protection
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Solution Overview
Problem
Mining shovels' dippers experience significant wear due to abrasive materials, leading to frequent and costly replacements, with existing wear assemblies primarily protecting only the lip of the bucket and requiring complex removal methods.
Innovation Solution
A removable liner assembly for the dipper's inner surface, comprising interlocking segments and rails, provides comprehensive protection by covering the inner surface and rails, allowing for easy replacement without welding or cutting, using a tongue-and-groove interlocking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wear assembly is welded to the excavating bucket to protect the lip, then protection reliability is improved, but removal complexity and time increase significantly
Solution Approach 1:
The wear assembly is divided into multiple removable segments that can be independently replaced. Each segment is designed with a tongue-and-groove interface that allows easy assembly and disassembly without welding, enabling selective replacement of worn portions while maintaining the protective function across the entire bucket lip.
Solution Approach 2:
The wear assembly transitions from a static welded connection to a dynamic removable connection system. The segments can be easily attached and detached using the tongue-and-groove mechanism, allowing the protection system to be dynamically adjusted, replaced, or reconfigured as needed without complex removal procedures.
2Reliability
If the dipper is replaced when worn to maintain performance, then operational reliability is improved, but loss of time and cost increase
Solution Approach 1:
The dipper is segmented into a base dipper structure and removable wear segments. When wear occurs, only the segments need replacement rather than the entire dipper, significantly reducing replacement time and cost while maintaining operational reliability through continuous protection of the digging edge.
Solution Approach 2:
The wear segments are designed to be discarded when worn and replaced with fresh segments, while the base dipper structure is recovered and reused. This selective replacement approach minimizes material waste, reduces replacement time, and lowers overall costs compared to replacing the entire dipper assembly.
3Device complexity
If a wear assembly protects only the lip of the bucket, then device complexity is reduced, but protection coverage is insufficient
Solution Approach 1:
The wear assembly uses multiple segments that can be arranged to cover the entire bucket lip and inner surface. The segmented design allows comprehensive protection coverage while keeping each individual segment simple in structure, balancing complexity reduction with adequate protection scope.
Solution Approach 2:
Multiple wear segments are merged together through the tongue-and-groove connection to form a continuous protective barrier across the entire bucket lip and inner surface. This combining approach provides comprehensive protection coverage while maintaining relatively simple individual segment designs.
Data Source
AI summary
A mining shovel includes a dipper having an inner surface, and a removable liner assembly coupled to the dipper and adjacent to the inner surface of the dipper. The removable liner assembly includes a first rail coupled to the dipper, a first liner segment disposed on the first rail and covering at least a portion of the first rail, and a second liner segment removably coupled to the first rail and covering at least one of a portion of the first liner segment and a portion of the first rail. The first rail is substantially covered by at least one of the first and second liner segments.