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A lump coal mining method

A mining method and mining process technology, applied in ground mining, earth square drilling, underground mining, etc., can solve problems such as poor operability and poor lump coal rate effect, and achieve good pre-splitting effect, economic benefits and social benefits Significant, easily controlled effect of the pre-splitting process

Active Publication Date: 2015-11-18
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above-mentioned methods for increasing the lump coal rate are in the theoretical research stage, and the operability is poor, and the effect of increasing the lump coal rate in the fully mechanized mining face is not good. Now there is no method with simple steps, reasonable design and simple and easy The lump coal mining method with effective and effective use can give specific guidance to the mining process of the fully mechanized mining face, and can effectively increase the lump coal rate of the fully mechanized mining face

Method used

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  • A lump coal mining method
  • A lump coal mining method
  • A lump coal mining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as figure 1 A kind of lump coal mining method shown, comprises the following steps:

[0068] Step 1. Advance pre-splitting of the coal seam: along the advancing direction of the coal seam working face, carry out advanced pre-splitting of the working face on the coal seam to be mined from near to far.

[0069] In this example, combined with Picture 1-1 In step 1, when the coal seam to be mined is pre-cracked in advance, the method of combining carbon dioxide pre-cracking and hydraulic fracturing is used for advanced pre-cracking, and the advanced pre-cracking is carried out in multiple segments from near to far. The advanced pre-cracking methods of the above segments are the same. Among them, when pre-splitting any segment, the process is as follows:

[0070] Step 101, drilling: Drill pre-split boreholes at a position 50m to 150m ahead of the current coal mining face in step 201, the number of said pre-split boreholes is one or more; the number of said pre-split...

Embodiment 2

[0163] In this example, if Figure 6 As shown, the difference from Example 1 is that the groove cutting member is a helical cutting device 12 installed on the drum of the shearer; the helical cutting device 12 is driven forward and backward by a push drive mechanism, and There is a transmission connection between the helical cutting device 12 and the pushing drive mechanism.

[0164] In this embodiment, the helical cutting device 12 is a helical drill bit.

[0165] In actual use, the diameter of the auger bit is 80mm-120mm and its length is 700mm-900mm, and the groove width and groove depth of the micro-groove cut by the helical cutting device 12 are 80mm-120mm and 700mm-900mm respectively.

[0166]In this embodiment, the diameter of the helical drill is 100 mm and the length is 800 mm, and the width and depth of the micro-grooves cut by the helical cutting device 12 are 100 mm and 800 mm, respectively. During actual construction, the diameter and length of the helical cutti...

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Abstract

The invention discloses a lump coal mining method comprising the following steps: 1, advanced pre-splitting of a coal bed, namely carrying out the advanced pre-splitting on a work surface of a to-be-mined coal bed from near to far along the advancing direction of a coal bed working surface; 2, mining of pre-splitting coal bed, namely mining the coal bed after the advanced pre-splitting from near to far, synchronously adjusting supporting force of a hydraulic bracket in the mining process, wherein the synchronous mining and supporting force adjusting process includes the following processes: 201, mining the coal bed, mining a current coal surface by adopting a coal cutter, wherein the adopted coal cutting mode in the mining process is a one-way coal cutting mode; 202, adjusting support and work resistance of the hydraulic bracket; 203, carrying out the next cycle of coal bed mining according to the steps 201 to 202; and 204, repeating the step 203 a plurality of times until all mining processes of a to-be-mined coal bed are finished. The method disclosed by the invention is simple in step, reasonable in design, simple, feasible, and good in using effect, and the lump coal rate and the recovery rate of the fully mechanized coal surface can be effectively increased.

Description

technical field [0001] The invention belongs to the technical field of coal seam mining, and in particular relates to a lump coal mining method. Background technique [0002] Because the production of lump coal is affected by many factors such as the strength of the coal seam itself, geological conditions, coal mining technology, and reloading process, the output only accounts for about 10% to 30% of the total output of raw coal. In the process of coal transportation, due to the difference in the drop of the transfer point and the way of coal falling, the lump coals collide with each other when they fall, causing serious loss of lump coal, and the lump coal rate drops by more than 20% to 30% during the transportation process. Therefore, under the mining process conditions of the existing fully mechanized mining face, the coal body is excessively crushed, and the production lump coal rate of the whole mine is low. According to statistics, the lump coal production rate of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21C25/10E21C25/66E21C25/60E21C37/14E21C37/06
Inventor 邓广哲
Owner XIAN UNIV OF SCI & TECH
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