A method for pre-splitting hard roof of coal seam

A technology of hard roof and coal seam, which is applied in the field of coal mining, can solve problems such as rock impact, achieve the effects of preventing rock impact, improving efficiency, and improving conversion efficiency

Active Publication Date: 2022-03-11
西安闪光能源科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this invention is to provide a method for pre-cracking the hard roof of the coal seam to solve the problem that the hard roof above the coal seam is difficult to fall naturally to form a suspended roof, which in turn leads to the problem of mine pressure

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  • A method for pre-splitting hard roof of coal seam
  • A method for pre-splitting hard roof of coal seam
  • A method for pre-splitting hard roof of coal seam

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and specific embodiment the content of the present invention is described in further detail:

[0031] A coal seam top coal pre-splitting method includes an energy converter 10 and an orifice device 11 .

[0032] Such as figure 2 As shown, the energy converter 10 includes a ground electrode 1 , a metal wire 2 , a high voltage electrode 3 , an insulating support 4 , a casing 5 and a cable interface 6 .

[0033] The shell 5 is a cylindrical structure, and its interior is hollow. The high-voltage electrode 3 is fixed on the end of the shell 5 through the insulating support 4. The cable at the end of the cable interface 6 passes through the body of the shell 5, the insulating support 4 and the rear end of the high-voltage electrode 3. Connection, the ground electrode 1 is arranged along the length direction of the casing 5 and is connected to the casing 5 , and the front end of the ground electrode 1 is opposite to the high vo...

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Abstract

The invention relates to a method for pre-cracking a hard roof of a coal seam, which aims to solve the problem that the hard roof above the coal seam is difficult to fall naturally to form a suspended roof, thereby causing impact mine pressure. The method for pre-cracking the hard roof of the coal seam includes the following steps: S1, setting the position and quantity of the drilled holes on the hard roof of the coal seam; drilling holes on the hard roof, the drill holes are opened on the coal seam and arranged obliquely upward, and the drilling The bottom of the hole extends to the upper end of the basic top area of ​​the hard roof; S2, install the orifice device in each borehole, and then fill the borehole with water; S3, connect the energy converter with the pulse power drive source; then the energy The converter is placed in the borehole; S4, start the pulse power drive source to discharge to the energy converter, and the shock wave generated by the energy converter cracks the hard roof of the coal seam; the intensity of the shock wave is 255-264MPa; multiple drill holes The cracks generated after the shock wave operation form a pre-crack zone, that is, the pre-cracking of the hard roof is completed.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for pre-cracking a hard roof of a coal seam. Background technique [0002] Mineral resources are the material basis of industrialization. my country's primary energy consumption mainly depends on coal supply, and its long-term proportion reaches more than 60%. It is the main pillar of my country's industrialization development. At present, when coal seam is mined, a coal mining face with a mining height of 2-3m is arranged along the floor of the coal seam or the bottom within a certain thickness range of the coal seam, and mining is carried out in a comprehensive mechanized manner. In the process of mining, the hard roof above the coal seam is difficult to fall naturally, thus forming a suspended roof. The formed suspended roof will pose a safety hazard and cause impact mine pressure. Therefore, a hard roof that is difficult to fall naturally is a major d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21C37/14E21C37/18
CPCE21C41/18E21C37/18E21C37/14
Inventor 张永民汤俊萍刘美娟张硕
Owner 西安闪光能源科技有限公司
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