Base Lift Wear Pad Threading for Fast Longwall Shield Replacement
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Solution Overview
Problem
Current mining shield base lift systems in longwall mining are difficult to maintain and require frequent replacement of wear pads, which is time-consuming and inefficient, especially in harsh underground environments.
Innovation Solution
A wear pad design with square threads and spanner holes for easy detachment and replacement, made of softer steel to promote wear on the pad rather than the cylinder rod, and held in place by retaining bolts for quick and secure installation, allowing for in-situ maintenance and extended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wear pads are made securely attached to the base lift, then reliability is improved, but ease of repair deteriorates
Solution Approach 1:
The wear pad is designed as a separate, detachable component from the base lift cylinder rod. This segmentation allows the wear pad to be securely attached during operation (improving reliability) while enabling quick removal and replacement by simply unscrewing the threaded connection (improving ease of repair). The modular design resolves the contradiction by making the attachment method both secure and reversible.
Solution Approach 2:
The wear pad attachment system transitions from a permanent or difficult-to-remove connection to a dynamic, easily adjustable threaded connection. The square threads provide secure engagement during operation but allow rapid disengagement when maintenance is needed. This dynamic attachment mechanism resolves the contradiction between reliable retention and easy replacement.
2Ease of repair
If wear pads are designed for easy replacement, then ease of repair is improved, but retention of the wear pad to the base lift deteriorates
Solution Approach 1:
By segmenting the wear pad as a separate replaceable component with its own threading, the design achieves both easy replacement (unscrew and remove) and secure retention (threaded engagement). The segmentation allows independent optimization of both replacement ease and operational retention.
Solution Approach 2:
The square thread design changes the mechanical parameters of the connection to provide both strong engagement during operation and easy disengagement during maintenance. The geometry of square threads allows for secure retention under load while requiring only simple rotational motion for removal, resolving the apparent contradiction between retention strength and replacement ease.
3Ease of manufacture
If standard threads are used on the wear pad, then ease of manufacture is improved, but replacement speed deteriorates
Solution Approach 1:
The patent specifies square threads instead of standard V-threads. While square threads are slightly more complex to manufacture than standard threads, they provide much faster replacement because they can be engaged and disengaged more easily without cross-threading issues. The manufacturing complexity increase is minimal compared to the significant reduction in replacement time, effectively resolving this contradiction in favor of operational efficiency.
4Duration of action of stationary object
If the wear pad material is softer than the cylinder rod, then the life of the base lift system is extended, but the wear pad requires more frequent replacement
Solution Approach 1:
The wear pad is intentionally designed as a sacrificial, consumable component made of softer material that wears preferentially to protect the expensive cylinder rod. The wear pad is replaced frequently (short life) while the base lift system continues to operate for extended periods (long life). This disposable approach to the wear pad resolves the contradiction by accepting frequent replacement of a cheap component to extend the life of the expensive system.
Solution Approach 2:
The softer material quality is applied locally to the wear pad surface that contacts the cylinder rod, creating a localized wear zone. This local quality change ensures that wear occurs only in the designated wear pad area, protecting the rest of the base lift system from wear and extending overall system life while the wear pad itself requires periodic replacement.
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
Facilitates speedy and efficient replacement of wear pads, reducing downtime and extending the life of the base lift system by allowing maintenance to be performed quickly and effectively in the mine, thereby maintaining efficient longwall mining operations.
Implementation Method 1
a thread (68) formed on the axial wall (88) of the wear member (78), the wear member thread to mate with a cylinder rod thread
Implementation Method 2
a plurality of retaining bolts (56) threaded through the axial wall (88) of the wear pad (54) and engaged with the cylinder rod (50) to retain the wear pad (54) on the cylinder rod (50)
Implementation Method 3
made of softer steel to promote wear on the pad rather than the cylinder rod
Data Source
AI summary
A wear pad for a longwall mining shield base lift. The wear pad includes at least one spanner hole for rotating the wear pad with a lever, at least one threaded retaining hole, and a retaining bolt threaded through the retaining hole until it contacts a cylinder rod to which the wear pad is to be attached.