Dipper Door Trip Assembly Roller Latch Mechanism
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Solution Overview
Problem
Current dipper door trip mechanisms in mining machines experience significant friction and wear due to the sliding motion of latch bars within latch keepers, necessitating the use of expensive, high-strength materials to withstand these forces.
Innovation Solution
A dipper door trip assembly that includes a latch keeper with a roller to engage and disengage the latch bar, reducing friction and wear by allowing a low-friction rolling motion, and a linkage assembly with a trip motor and biasing mechanism to facilitate easy unlatching of the dipper door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sliding latch bar mechanism is used to unlatch the dipper door, then the dipper door can be released from the dipper, but significant friction and wear occur on the latch bar and latch keeper surfaces
Solution Approach 1:
A roller is introduced as an intermediary element between the latch bar and latch keeper. The roller converts the sliding friction contact into rolling contact, significantly reducing wear and friction on the latch bar and latch keeper surfaces while maintaining the dipper door release function
Solution Approach 2:
The sliding friction-based mechanical system is replaced with a rolling contact system. The roller eliminates direct sliding contact between the latch bar and latch keeper, substituting a low-friction rolling mechanism that reduces wear and extends component life
2Reliability
If expensive exotic high strength materials are used for the latch bar and latch keeper, then they can withstand the high friction and wear, but the cost of the dipper door trip mechanism increases significantly
Solution Approach 1:
The roller serves as a mediator that protects the latch bar and latch keeper from direct high-friction contact. This allows the use of standard, lower-cost materials for these components while maintaining durability, as the roller absorbs the wear through its rolling contact mechanism
Solution Approach 2:
The roller is designed as a sacrificial, lower-cost component that can be easily replaced when worn. By making the roller disposable or easily replaceable, the expensive latch bar and latch keeper are protected from wear, reducing overall maintenance costs and allowing the use of cheaper materials for the main latch components
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 solution significantly reduces friction and wear on the latch bar and latch keeper, eliminating the need for exotic materials and minimizing mechanical stresses, thereby enhancing the operational efficiency and reducing maintenance costs.
Implementation Method 1
The latch keeper includes a roller that engages and disengages the latch bar
Implementation Method 2
Movement of the latch bar generates significant amounts of friction and wear on surfaces of the latch bar and latch keeper... reducing friction and wear by allowing a low-friction rolling motion
Data Source
AI summary
A dipper door trip assembly includes a dipper, a dipper door pivotally coupled to the dipper, a linkage assembly including a sliding latch bar disposed at least partially in the dipper door, and a latch keeper coupled to the dipper. The latch keeper includes a roller that engages and disengages the latch bar.