Asymmetric Hydraulic Support Layout to Prevent Tail Sliding
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Solution Overview
Problem
Existing hydraulic supports for pseudo inclined mining in steeply dipping seams are prone to bracket tail sliding, shifting space, and machine roadway spalling, which affect productivity and cannot meet the requirements of comprehensive mechanization and intelligent unmanned mining.
Innovation Solution
An asymmetric hydraulic support with a top mechanism, bottom mechanism, telescopic mechanism, and connecting mechanism, arranged in a parallelogram configuration, featuring a telescopic structure and connecting structures with articulating shafts, ensuring parallel movement and gapless alignment of adjacent supports to prevent sliding and spalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing hydraulic supports are used for pseudo inclined mining in steeply dipping seams, then the mining process can be simplified and coal wall stabilization is improved, but the supports are prone to bracket tail sliding, shifting space, and machine roadway spalling
Solution Approach 1:
The patent applies asymmetry by designing the hydraulic support with different structures for the upper and lower ends. The upper end mechanism includes a upper linkage arm and upper cylinder, while the lower end mechanism includes a lower linkage arm and lower cylinder, with different geometric configurations and connection points. This asymmetric design allows the support to adapt to the inclined working face geometry and distribute forces unevenly to prevent bracket tail sliding and improve overall stability during pseudo inclined mining operations
Solution Approach 2:
The patent implements dynamics through the telescopic mechanism that allows the distance between the upper and lower mechanisms to be adjusted. The telescopic cylinder can extend and retract to maintain optimal support geometry as the mining face advances and as the inclination angle varies. This dynamic adjustment capability enables the support to adapt to changing conditions and prevent shifting space and roadway spalling
2Stability of the object's composition
If the working surface arrangement is changed for pseudo inclined mining, then coal wall stabilization and coal flow control are improved, but the supports experience bracket tail sliding and shifting space
Solution Approach 1:
The patent applies preliminary anti-action by designing the asymmetric hydraulic support with pre-configured upper and lower mechanisms that counteract the forces causing bracket tail sliding before it occurs. The upper linkage arm and lower linkage arm are positioned and dimensioned to create opposing moments that balance the destabilizing forces from the inclined working face arrangement, preventing bracket tail sliding and maintaining support position stability
3Productivity
If existing hydraulic supports are used, then productivity can be maintained, but the supports are prone to damage and cannot meet comprehensive mechanization requirements
Solution Approach 1:
The patent applies segmentation by dividing the hydraulic support into distinct upper end mechanism and lower end mechanism components. The upper mechanism includes the upper linkage arm, upper cylinder, and associated connections, while the lower mechanism includes the lower linkage arm, lower cylinder, and connections. This segmentation allows each component to be optimized for its specific functional requirements and facilitates easier maintenance and replacement, improving both reliability and productivity
Data Source
AI summary
The embodiments of the present disclosure provide an asymmetric hydraulic support for pseudo inclined mining in steeply dipping seam, wherein the asymmetric hydraulic support includes a top mechanism, a bottom mechanism, a telescopic mechanism, and a connecting mechanism; the top mechanism and the bottom mechanism are disposed in parallel to each other, and a projection of the top mechanism and the bottom mechanism on a working surface is a parallelogram, and a sum of an acute angle of each of two parallelograms and a steeply dipping angle in pseudo inclined mining is 90°; the telescopic mechanism is provided between the top mechanism and the bottom mechanism, and two ends of the telescopic mechanism are rotationally connected to the top mechanism and the bottom mechanism, respectively; one end of the two sets of connecting structures of the connecting mechanism is hinged by a first articulating shaft, and a central axis of the first articulating shaft is located in a middle of the top mechanism and the bottom mechanism, and the other end of each of the two sets of connecting structures is hinged to a first side of the top mechanism and a first side of the bottom mechanism, respectively, by a second articulating shaft; one end of the telescoping structure is hinged to a set of connecting structure which is hinged to the top mechanism, the other end of the telescoping structure is hinged to the bottom mechanism, and a center point of the hinging is coplanar with a vertical bisector of a projection of an edge of the first side of the bottom mechanism on the working surface.