Mining Shovel Dipper Door Latch With Wear-Reducing Roller
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Solution Overview
Problem
Conventional dipper door latch mechanisms in mining shovels experience excessive wear due to harsh operating conditions, leading to high maintenance costs and machine downtime.
Innovation Solution
A dipper assembly with a latch assembly featuring a latch member equipped with at least one roller to facilitate engagement and disengagement with a latch keeper, reducing wear and friction between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional latch mechanism is used in the dipper door assembly, then the structure is simple and easy to manufacture, but the latch components experience excessive wear due to harsh operating conditions
Solution Approach 1:
A roller is introduced as an intermediary element between the latch member and latch keeper. The roller reduces direct sliding contact and friction between these components, thereby minimizing wear while maintaining the overall simplicity of the latch mechanism structure
Solution Approach 2:
The latch member is designed with movable/adjustable features that allow it to adapt to wear and operational stresses. This dynamic capability enables the latch mechanism to maintain reliable engagement despite harsh operating conditions, extending component lifespan without requiring complex replacement systems
2Reliability
If the latch mechanism operates under harsh mining conditions, then the dipper door remains securely latched during operation, but the latch components suffer from excessive wear requiring frequent maintenance
Solution Approach 1:
The roller acts as a mediator that protects the latch member and latch keeper from direct abrasive contact during secure engagement. This reduces wear on the latching surfaces while maintaining the secure locked position required for reliable operation under harsh mining conditions
Solution Approach 2:
The roller is designed as a replaceable wear component that can be easily replaced when worn, protecting the more expensive and critical latch member and latch keeper from wear. This allows frequent maintenance of the roller without replacing entire latch assemblies, extending the service life of the main latch components
3Ease of operation
If a simple latch bar and latch keeper mechanism is used, then the device complexity is low, but the latch components require continual adjustment and maintenance due to wear
Solution Approach 1:
The roller serves as a maintenance-friendly intermediary component that absorbs wear. When the roller becomes worn, it can be replaced without affecting the alignment or operation of the latch member and latch keeper, minimizing the need for continual adjustment while maintaining reliable latch operation
Solution Approach 2:
The latch mechanism is segmented into distinct functional components: the roller as a wear element, the latch member as the actuating component, and the latch keeper as the receiving element. This segmentation allows the roller to be independently replaced and adjusted, simplifying maintenance operations while preserving the reliability of the overall latch mechanism
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 roller-assisted latch mechanism prolongs the operational lifespan of the dipper assembly by minimizing wear and reducing maintenance requirements.
Implementation Method 1
at least one roller to assist the latch member in engaging and disengaging the latch keeper and to at least partially reduce wear on the latch member
Implementation Method 2
the latch member including at least one roller to assist the latch member in engaging and disengaging the latch keeper
Data Source
AI summary
A dipper assembly and parts thereof for use with a mining shovel. The dipper assembly includes: a dipper body having a back wall and an open dipper bottom; a dipper door pivotally coupled to the back wall of the dipper body and moveable between open and closed positions relative to the open dipper bottom; and a latch assembly for releasably securing the door in the closed position. The latch assembly includes a latch keeper and a latch member for engaging the latch keeper. The latch keeper is associated with the dipper body proximate the open dipper bottom and the latch member is coupled to the dipper door. The latch member includes at least one roller to assist the latch member in engaging and disengaging with the latch keeper and to reduce wear on the latch member.