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Support device for critical pseudo-inclined working face of steeply inclined coal seam

A technology of inclined working face and supporting device, which is applied in the direction of mine roof support, transportation and packaging, mining equipment, etc., can solve the problems of mining equipment slipping and coal wall slabs that cannot be effectively solved, and solve the difficulty of pushing and sliding , Prevent coal wall flakes, good fit effect

Inactive Publication Date: 2019-03-19
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the existing steeply inclined coal seam with an inclination angle greater than 55° and a coal seam thickness greater than 2.0m is mined using the traditional pseudo-inclined layout of the working face, the problems of backslipping of mining equipment and coal wall slabs cannot be effectively solved. In order to solve this technical problem, The invention provides a support device for a critical pseudo-inclined working face in a steeply inclined coal seam. The invention is an improvement aimed at the disadvantages of the pseudo-inclined arrangement of the working face and the working face equipment in the current comprehensive mechanized mining of the long wall of the steeply inclined coal seam.

Method used

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  • Support device for critical pseudo-inclined working face of steeply inclined coal seam
  • Support device for critical pseudo-inclined working face of steeply inclined coal seam

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1: A kind of comprehensive mechanized mining method of steeply inclined coal seam critical pseudo-dip angle, including the following process:

[0023] 1) Layout of working face with critical pseudo-inclination angle

[0024] 1.1) The working face is arranged along the inclination and advances along the strike. The leading distance of the return air end is equal to the projected length of the working face in the true inclination direction, that is, the pseudo-inclination angle is 45° (defined as the critical pseudo-inclination angle);

[0025] 1.2) When the inclination angle of the coal seam is greater than 55°, the design of the pseudo-depression angle of the working face should meet the following requirements: ensure that the inclination angle of the coal sliding channel on the working face is greater than the natural repose angle of the loose coal body (the natural repose angle of bulk coal is 35°), and the coal mining The coal crushed by the machine can sl...

Embodiment 2

[0031] Embodiment 2: as figure 1 As shown in (a), the layout of the working face with a critical pseudo-depression angle: the return air roadway and the transport roadway are excavated along the coal seam direction, and the distance between the end of the return air roadway and the end of the transport roadway is equal to the length l of the true inclination direction of the working face. The cut hole is excavated between the end of the return air roadway and the end of the transportation roadway on the working face, and the pseudo-sloping working face formed has an included angle of 45° with the direction of the coal seam (critical pseudo-inclined angle).

Embodiment 3

[0032] Embodiment 3: as figure 1 As shown in (b), the spatial geometric relationship between the true inclination angle β of the pseudo-sloping working face, the coal seam inclination angle α and the critical pseudo-inclination angle γ is:

[0033] l 1 sinβ=l 1 cosγ·sinα (1)

[0034] When the inclination angle α of the coal seam is 55°, to ensure that the coal cut by the shearer can slip by itself, the true inclination angle of the pseudo-sloping working face should be greater than 35° (the natural repose angle of the loose coal body), that is:

[0035] sinβ>sin35°=0.574 (2)

[0036] Substitute (1) into (2) to get:

[0037] cosγ·sin55°>0.574 (3)

[0038] It is found that when γ=45° and α≥55°, the true inclination β of the working face is always greater than 35°, so the critical pseudo-inclination angle is determined to be 45°.

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Abstract

The invention relates to a support device for a critical pseudo-inclined working face of a steeply inclined coal seam. The support device comprises a top beam, a base, guide rails and push rods, a coal cutter walks along the guide rails, the guide rails are fixed on the base through the push rods, the true dip of the pseudo-inclined working face beta is 35 degrees greater than the natural angle ofrepose, the bottom of the base is parallel to the pseudo-inclined direction of the pseudo-inclined working face, and a coal conveying channel is formed in free space of the base and bottom plate among coal walls. The support device solves the problems of backsliding of mining equipment and wall caving of the coal walls, and aims at improving the disadvantages of an existing long wall comprehensive mechanical mining working face pseudo-inclined arrangement mode of the steeply inclined coal seam and working face equipment.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a critical pseudo-angle mining method and equipment for steeply inclined coal seams. Background technique [0002] The pseudo-inclined layout of the coal mining face in the steeply inclined coal seam can be used to mine the steeply inclined coal seam as a "slowly inclined" or "inclined" working face, which improves the support of the working face and the self-stability of the mining equipment, improves the working environment, and improves the efficiency of the working face and safety benefits. [0003] The pseudo-inclined arrangement of the working face is one of the commonly used methods for mining steeply inclined coal seams. Its advantage is that the pseudo-inclined arrangement of the working face can slow down the inclination of the working face, which is conducive to preventing falling and slipping of the working face equipment. Pseudo-inclined arrangement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D23/00E21F13/04
CPCE21D23/0004E21F13/04
Inventor 郎丁
Owner XIAN UNIV OF SCI & TECH
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