Quick-Response Hydraulic Support for Coal Wall Spalling
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Solution Overview
Problem
Existing hydraulic supports for coal wall spalling in large mining heights suffer from reduced effective support area due to split structure design and low transmission efficiency of hydraulic systems, leading to ineffective prevention of spalling and increased risk of roof fall and personnel safety hazards, while contact-based sensor monitoring is costly, complex, and prone to electromagnetic interference.
Innovation Solution
A hydraulic support with a quick response function incorporating a vibration meter for non-contact coal wall monitoring, a quick response device with electrical and mechanical mechanisms, and a telescopic plate for timely, large-area support, allowing the auxiliary face guard to act before primary face guards engage, and retracting to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a split structure design of extensible canopy and face guard is adopted to apply active horizontal acting force on coal wall, then the supporting acting force on coal wall is improved, but the effective support area is reduced because primary face guard cannot contact coal wall
Solution Approach 1:
The face guard is divided into multiple segments (primary face guard, secondary face guard, tertiary face guard) that can independently contact the coal wall. This segmentation allows different parts of the face guard to perform different functions: the primary face guard provides immediate contact and support, while the secondary and tertiary face guards extend to increase the effective support area.
2Force
If hydraulic systems are used for jacks of extensible canopy and face guard, then the supporting force is achieved, but the transmission efficiency and action speed are low
Solution Approach 1:
The primary face guard is pre-positioned to contact the coal wall immediately when needed, providing instant support without requiring extension movements. This preliminary positioning eliminates the delay associated with hydraulic extension, achieving both force application and rapid response.
Solution Approach 2:
The patent replaces the hydraulic jack system with a mechanical linkage system consisting of the extensible canopy and multi-segment face guard. This mechanical system provides more direct and faster transmission of supporting force to the coal wall, improving both transmission efficiency and action speed.
3Measurement precision
If contact-based sensor technology is used for coal wall condition monitoring, then measurement is achieved, but the cost is high, installation is complicated, and electromagnetic interference causes inaccurate results
Solution Approach 1:
The patent replaces contact-based electromagnetic sensors with a mechanical monitoring system that uses the structural elements of the hydraulic support itself (canopy, face guard, and their linkages) to detect and respond to coal wall conditions. This mechanical system is immune to electromagnetic interference, simpler to install, and provides direct physical feedback on coal wall stability.
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
Enables real-time, accurate coal wall condition monitoring, timely and efficient large-area support, and automatic adjustment of support area, reducing the risk of spalling and roof fall, with minimal space occupation and compatibility with existing supports.
Implementation Method 1
The vibration meter is mounted on a hydraulic support, and detects a vibration signal of a coal wall in a non-contact mode
Data Source
AI summary
The present disclosure relates to a hydraulic support with a quick response function for coal wall spalling, which includes a base, an upright post, a top beam, an extensible canopy, a face guard, and a vibration meter. The vibration meter is mounted on a hydraulic support, and detects a vibration signal of a coal wall in a non-contact mode. The face guard includes a primary face guard, a secondary face guard, and a tertiary face guard connected in sequence. One side, close to a coal wall, of the primary face guard is connected to a quick response device. The quick response device is in signal communication with the vibration meter. After receiving the vibration signal of the coal wall, the quick response device is abutted against the coal wall before the secondary face guard and the tertiary face guard fit the coal wall.