Longwall Face Creep Detection via Position Monitoring
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Solution Overview
Problem
Longwall mining systems experience equipment migration or creep, leading to reduced clearance in roadways, making access difficult for personnel and causing damage to equipment.
Innovation Solution
A detection system comprising a detection device, indicator devices, and a controller that determines the position of the beam stage loader-armored face conveyor interface relative to the maingate centerline, generating indications of face creep to facilitate corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the longwall mining system operates continuously, then productivity is improved, but equipment migration or creep occurs causing reduced clearance and access difficulty
Solution Approach 1:
The system performs preliminary detection of face creep conditions using detection devices and indicator devices before the creep becomes severe enough to block personnel access. The controller continuously monitors the position of the armored face conveyor relative to the maingate centerline and generates early warnings, allowing operators to take corrective actions before access is compromised.
Solution Approach 2:
The system implements a feedback mechanism where detection devices monitor the position of longwall equipment, the controller processes this information to determine face creep conditions, and the system generates indications to operators. This closed-loop feedback enables continuous monitoring and timely correction of creep without interrupting mining operations.
2Productivity
If the longwall mining system operates continuously, then productivity is improved, but equipment migration or creep causes damage to longwall equipment
Solution Approach 1:
The detection system identifies face creep conditions before they progress to the point of causing equipment damage. By continuously monitoring the displacement of the armored face conveyor and generating early warnings, the system allows operators to correct creep conditions before rubbing against maingate equipment occurs, preventing damage while maintaining continuous operation.
Solution Approach 2:
The system provides continuous feedback on equipment position and creep conditions, enabling real-time monitoring and corrective action. This feedback loop prevents damage by alerting operators to developing creep conditions before they result in equipment rubbing or failure.
3Measurement precision
If detection devices and indicator devices are installed to monitor face creep, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into distinct functional components: detection devices mounted on the longwall equipment to measure position, indicator devices that mark reference positions, and a controller that processes the data. This segmentation allows each component to be optimized independently while maintaining overall system precision without excessive complexity.
Solution Approach 2:
The system uses indicator devices as intermediaries that provide visual or detectable reference marks for the detection devices. These intermediaries simplify the measurement process by providing clear reference points without requiring complex measurement mechanisms, thereby improving measurement precision while limiting the increase in system complexity.
Data Source
AI summary
Systems and methods are provided for detecting face creep of a longwall mining system. The system includes a detection device mounted in a maingate roadway and coupled to the detection device. The controller determines the position of the beam stage loader-armored face conveyor interface based on a signal from the first indicator device, determines a position of a maingate line based on a signal from a maingate indicator device, and determines a position of a belt conveyor based on a signal from a belt conveyor indicator device. The controller further determines a first distance between the position of the beam stage loader-armored face conveyor interface and a maingate line, and a second distance between the position of the belt conveyor and the maingate line. The controller generates an indication of face creep based on the first distance and the second distance.