Blowout-proof coal mine underground high-pressure water jet penetration drilling and coal breaking permeability enhancement device

Abstract

The present invention provides a blowout-proof coal mine underground high-pressure water jet drilling and coal-breaking permeability enhancement device, comprising a crawler-type mobile base, a hydraulic drilling rig, a coal-blowout-proof water discharge device, a coal-water mixture separator and a control cabinet, wherein the front end of the hydraulic drilling rig is provided with a hydraulic drill rod, and the coal-blowout-proof water discharge device comprises a capsule sleeve, a liquid-filled capsule, a telescopic rubber tube, a liquid injection pipe, and a liquid injection pump; the liquid-filled capsule is connected to the liquid injection pump via the liquid injection pipe; the rear end of the hydraulic drill rod is connected to the high-pressure pump via a high-pressure water pipe, and the rear end of the high-pressure pump is connected to a water source box. The present invention can effectively avoid the occurrence of spray holes and the overflow of coal-water mixture and gas during the process of high-pressure water jet drilling and coal-breaking permeability enhancement in coal mines, thereby preventing the occurrence of safety accidents and improving the efficiency of jet coal breaking.

Description

Technical Field

[0001] The invention relates to the technical field of mine equipment, in particular to a blowout-proof underground coal mine high-pressure water jet layer-penetrating drilling and coal-breaking permeability-enhancing device. Background Art

[0002] Coal has long been the main energy source in my country's energy structure, which will keep my country's coal production high. my country's coal reserves are about 5.5 trillion tons, and coal resources buried below 1000m account for 53% of the total. Due to the high-intensity mining of coal, the shallow resources in many mining areas are close to exhaustion, which makes many coal mines extend to the depth at a rate of 10 to 20m per year, and the mining depth of many coal mines has reached more than 1000m. In order to ensure the energy supply needs of my country's rapid economic development, deep coal mining is imperative. In the process of deep coal mining, under the influence of many factors such as high ground stress, high ground temperature, high osmotic pressure and strong mining disturbance, the difficulty of gas extraction is increased. Therefore, deep coal mining is particularly important for decompressing coal seams and increasing coal seam permeability to improve gas extraction efficiency. At present, in the process of decompression and permeability enhancement of deep low-permeability coal seams, high-pressure water jet drilling and coal breaking permeability enhancement technology (hydraulic slitting, hydraulic punching, hydraulic cavitation) is mostly used. This technology has the advantages of good permeability enhancement effect, low cost, and no pollution. It can achieve decompression and permeability enhancement of different coal seams, reduce the danger of gas outburst, and enhance the effect of gas extraction and emission. It is widely used. In the process of high-pressure water jet coal breaking in coal seams, the coal-water mixture and gas are not discharged evenly, and sometimes a large amount of coal-water mixture and gas are discharged sharply. The traditional underground coal mine high-pressure water jet drilling and coal breaking permeability enhancement device cannot collect and process the sudden and sharp increase of a large amount of coal-water mixture and gas in time, which is easy to induce blowout and gas disaster accidents. In view of this, it is necessary to provide a new blowout-proof underground coal mine high-pressure water jet drilling and coal breaking permeability enhancement device to solve the above technical problems. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a blowout-proof coal mine underground high-pressure water jet penetration drilling and coal breaking and permeability enhancement device, which can effectively avoid the occurrence of blowout holes and coal-water mixture and gas overflow during the process of high-pressure water jet penetration drilling and coal breaking and permeability enhancement in coal mines, prevent the occurrence of safety accidents, and improve the jet coal breaking efficiency.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A blowout prevention type underground high-pressure water jet drilling and coal breaking and permeability enhancement device for coal mines, characterized in that it comprises a crawler-type mobile base, a hydraulic drilling rig, a blowout prevention water discharge device, a coal-water mixture separator and a control cabinet, wherein the hydraulic drilling rig coal-water mixture separator and the control cabinet are mounted on the crawler-type mobile base, a hydraulic drill rod is provided at the front end of the hydraulic drilling rig, and the blowout prevention water discharge device comprises a capsule sleeve, a liquid-filled capsule, a telescopic rubber sleeve, a liquid injection pipe and a liquid injection pump; the capsule sleeve is in a circular ring shape, and the capsule sleeve is sleeved on the outside of the hydraulic drill rod. A coal-water mixture channel is left between the inner wall of the capsule sleeve and the outer wall of the hydraulic drill rod; the liquid-filled capsule is coated on the outer periphery of the capsule sleeve, and the liquid-filled capsule is connected to the liquid injection pump by means of an injection tube; the telescopic rubber tube is sleeved on the outer periphery of the hydraulic drill rod, the front end of the telescopic rubber tube is open and fixedly connected to the capsule sleeve, the rear end of the telescopic rubber tube is provided with a closing sleeve sealed with the hydraulic drill rod, and the rear end of the telescopic rubber tube is connected to the coal-water mixture separator by means of a discharge pipe; the rear end of the hydraulic drill rod is connected to the high-pressure pump through a high-pressure water pipe, and the rear end of the high-pressure pump is connected to a water source tank.

[0006] Furthermore, the coal-water mixture separator includes a separator box, a vibrating screen located in the middle of the separator box, a coal slag discharge port is provided on the side of the separator box above the vibrating screen, a drainage port is provided on the side of the separator box at the bottom of the vibrating screen, a coal-water mixture feed port and a gas discharge port are provided on the top of the separator box, the coal-water mixture feed port is connected to the discharge pipe, and variable frequency vibrators are provided at both ends of the vibrating screen.

[0007] Furthermore, a flow meter is provided in the coal-water mixture channel between the inner side of the capsule sleeve and the hydraulic drill pipe, and the flow meter is fixed on the cylinder wall of the capsule sleeve.

[0008] Furthermore, a telescopic rod is provided in the telescopic rubber tube, and the telescopic rod is an electric telescopic rod or a hydraulic telescopic rod.

[0009] Furthermore, a computer circuit board is provided in the control cabinet, and the computer circuit board is connected to the flow meter, the high-pressure pump, and the variable frequency vibrator through an electric circuit.

[0010] Furthermore, the liquid-filled capsule is a hollow capsule made of elastic rubber material. The liquid-filled capsule is placed in a liquid and gas recovery sealing hole pre-drilled on the rock layer at the bottom of the coal seam. High-pressure liquid is filled into the hollow capsule of the liquid-filled capsule to make the outer wall of the liquid-filled capsule expand and support the liquid and gas recovery sealing hole, thereby achieving the sealing of the liquid and gas recovery sealing hole.

[0011] Furthermore, the coal ash discharge port of the coal-water mixture separator is provided with a double-layer sealing curtain.

[0012] The present invention has the following beneficial effects:

[0013] 1. The coal-blowout prevention water discharge device of the present invention adopts a telescopic rubber tube. When the flow rate of the coal-water mixture and gas returning in the borehole suddenly increases, the length of the telescopic rubber tube will increase accordingly to accommodate the suddenly increased coal-water mixture and gas, and then transport them to the coal-water mixture separator for processing, thereby avoiding the occurrence of blowout holes and gas disasters.

[0014] 2. The computer circuit board of the present invention determines the hardness and softness of the coal seam according to the flow data of the flow meter, and then adjusts the water pressure of the high-pressure pump and the vibration frequency of the variable frequency vibrator to avoid the waste of water and energy caused by excessive water pressure.

[0015] 3. The coal-blowout prevention water discharge device of the present invention allows the coal-water mixture and gas to enter the coal-water mixture separator at a uniform speed, which can effectively improve the separation effect of the coal-water mixture separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the installation of the liquid-filled capsule and the telescopic rubber tube of the present invention.

[0018] Figure 3 It is a radial cross-sectional schematic diagram of the position of the capsule sleeve of the present invention.

[0019] The corresponding parts names in the figure are: 1 crawler mobile base; 2 hydraulic drilling rig; 3 control cabinet; 4 hydraulic drill rod; 5 capsule sleeve; 6 liquid-filled capsule; 7 telescopic rubber cylinder; 8 injection pipe; 9 injection pump; 10 coal-water mixture channel; 11 discharge pipe; 12 high-pressure water pipe; 13 high-pressure pump; 14 water source box; 15 separator box; 16 vibrating screen; 17 coal slag discharge port; 18 drainage port; 19 coal-water mixture feed port; 20 gas discharge port; 21 variable frequency vibrator; 22 flow meter; 23 telescopic rod; 24 sealing curtain; 100 liquid and gas recovery sealing hole. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods, structures and features of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. However, the accompanying drawings are only provided for reference and explanation, and are not intended to limit the present invention.

[0021] See also Figures 1 to 3As shown, the present invention provides a coal mine underground high-pressure water jet through-layer drilling and coal-breaking permeability enhancement device for preventing coal blowout, comprising a crawler-type mobile base 1, a hydraulic drilling rig 2, a coal blowout prevention water discharge device, a coal-water mixture separator and a control cabinet 3, wherein the hydraulic drilling rig coal-water mixture separator and the control cabinet are installed on the crawler-type mobile base, a hydraulic drill rod 4 is provided at the front end of the hydraulic drilling rig, and the coal blowout prevention water discharge device comprises a capsule sleeve 5, a liquid-filled capsule 6, a telescopic rubber cylinder 7, a liquid injection pipe 8, and a liquid injection pump 9; the capsule sleeve is in a circular ring shape, and the capsule sleeve is sleeved on the outside of the hydraulic drill rod. A coal-water mixture passage 10 is left between the inner wall of the capsule sleeve and the outer wall of the hydraulic drill pipe; the liquid-filled capsule is coated on the outer periphery of the capsule sleeve, and the liquid-filled capsule is connected to the injection pump through the injection pipe; the telescopic rubber tube is sleeved on the outer periphery of the hydraulic drill pipe, the front end of the telescopic rubber tube is open and fixedly connected to the capsule sleeve, the rear end of the telescopic rubber tube is provided with a closing sleeve that is sealed and connected to the hydraulic drill pipe, and the rear end of the telescopic rubber tube is connected to the coal-water mixture separator through the discharge pipe 11; the rear end of the hydraulic drill pipe is connected to the high-pressure pump 13 through the high-pressure water pipe 12, and the rear end of the high-pressure pump is connected to the water source box 14. The coal-water mixture separator includes a separator box 15, a vibrating screen 16 located in the middle of the separator box, a coal slag discharge port 17 is provided on the side of the separator box at the top of the vibrating screen, a drainage port 18 is provided on the side of the separator box at the bottom of the vibrating screen, a coal-water mixture feed port 19 and a gas discharge port 20 are provided on the top of the separator box, the coal-water mixture feed port 19 is connected to the discharge pipe 11, and variable frequency vibrators 21 are provided at both ends of the vibrating screen. A flow meter 22 is provided in the coal-water mixture channel between the inner side of the capsule sleeve and the hydraulic drill pipe, and the flow meter is fixed on the cylinder wall of the capsule sleeve. A telescopic rod 23 is provided in the telescopic rubber cylinder, and the telescopic rod is an electric telescopic rod or a hydraulic telescopic rod. The liquid-filled capsule is a hollow capsule made of elastic rubber. The liquid-filled capsule is placed in a pre-drilled liquid-gas recovery sealing hole 100 on the rock formation at the bottom of the coal seam. High-pressure liquid is filled into the hollow capsule of the liquid-filled capsule to expand the outer wall of the liquid-filled capsule to support the liquid-gas recovery sealing hole, thereby sealing the liquid-gas recovery sealing hole. The coal slag discharge port of the coal-water mixture separator is provided with a double-layer sealing curtain 24

[0022] The control cabinet is provided with a computer circuit board, which is connected to the flow meter, the high-pressure pump, and the variable frequency vibrator through a circuit. The computer circuit board receives the signal of the flow meter to adjust the water pressure of the high-pressure pump and the vibration frequency of the variable frequency vibrator, thereby avoiding the waste of water and energy due to excessive water pressure. At the same time, the coal-water mixture and gas can enter the coal-water mixture separator at a uniform speed, which can effectively improve the separation effect of the coal-water mixture separator.

[0023] The anti-blowout type coal mine underground high-pressure water jet drilling and coal breaking and permeability enhancement device based on the above structural design, when in use, first open the liquid gas recovery sealing hole 100 on the rock layer at the bottom of the coal seam, before the hydraulic drill rod 4 is advanced, the liquid-filled capsule 6 is located in the liquid gas recovery sealing hole 100, and the injection pump 9 is started to inject the liquid into the liquid-filled capsule 6 through the injection pipe 8 to achieve the blocking of the liquid gas recovery sealing hole 100. Then the hydraulic drill rod 4 starts to advance, and the high-pressure water enters through the internal through hole of the hydraulic drill rod 4 to jet impact the coal seam and the rock layer. The coal-water mixture generated during the advancement of the hydraulic drill rod 4 can only enter the rear telescopic rubber tube 7 through the coal-water mixture channel 10, and the coal-water mixture in the telescopic rubber tube 7 is then discharged into the separator box 15 through the discharge pipe 11 for separation. In the process of high-pressure water jet coal breaking, the computer circuit board in the control cabinet 3 judges the hardness of the coal rock according to the change in the flow rate of the coal-water mixture returned by the flow meter 22, and adjusts the water pressure of the high-pressure pump 13 in real time to improve the efficiency of jet coal breaking. When the flow rate of the coal-water mixture changes, the telescopic rubber tube 7 can automatically change its length under the action of pressure to avoid the occurrence of spray holes and gas disasters. The control cabinet 3 can also control the telescopic stroke of the telescopic rubber tube 7 through the telescopic rod 23. The coal-water mixture entering the separator box 15 is separated into coal water and coal slag by the back-and-forth vibration of the vibrating screen, and the gas containing gas enters the gas extraction system through the gas discharge port 20. When the flow rate of the coal-water mixture and gas suddenly increases during the high-pressure water jet coal breaking process, the length of the telescopic rubber tube 7 will increase accordingly to accommodate the sudden increase in the coal-water mixture and gas, and then transport it to the coal-water mixture separator for processing, avoiding the occurrence of spray holes and gas disasters.

[0024] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blowout-proof coal mine underground high-pressure water jet penetration drilling and coal breaking permeability enhancement device, characterized in that: It includes a crawler-type mobile base, a hydraulic drilling rig, a coal-water mixture discharge device, a coal-water mixture separator and a control cabinet. The hydraulic drilling rig, the coal-water mixture separator and the control cabinet are installed on the crawler-type mobile base. A hydraulic drill rod is provided at the front end of the hydraulic drilling rig. The coal-water mixture discharge device includes a capsule sleeve, a liquid-filled capsule, a telescopic rubber sleeve, a liquid injection pipe and a liquid injection pump. The capsule sleeve is in a circular ring shape. The capsule sleeve is sleeved outside the hydraulic drill rod. A coal-water mixture channel is left between the inner wall of the capsule sleeve and the outer wall of the hydraulic drill rod. The liquid-filled capsule is coated on the outer periphery of the capsule sleeve, and the liquid-filled capsule is connected to the liquid injection pump by means of a liquid injection pipe. The telescopic rubber sleeve is sleeved on the outer periphery of the hydraulic drill rod. The front end of the telescopic rubber sleeve is open and fixedly connected to the capsule sleeve. The rear end of the telescopic rubber sleeve is provided with a closing sleeve sealed and connected to the hydraulic drill rod. The rear end of the telescopic rubber sleeve is connected to the coal-water mixture separator by means of a discharge pipe. The rear end of the hydraulic drill rod is connected to the high-pressure pump through a high-pressure water pipe, and the rear end of the high-pressure pump is connected to a water source tank. A flow meter is provided in the coal-water mixture channel between the inner side of the capsule sleeve and the hydraulic drill pipe, and the flow meter is fixed on the cylinder wall of the capsule sleeve; a telescopic rod is provided in the telescopic rubber cylinder, and the telescopic rod is an electric telescopic rod or a hydraulic telescopic rod.

2. The anti-blowout type underground coal mine high-pressure water jet penetration drilling and coal breaking permeability enhancement device according to claim 1 is characterized in that: The coal-water mixture separator comprises a separator box, a vibrating screen located in the middle of the separator box, a coal slag discharge port is provided on the side of the separator box above the vibrating screen, a water discharge port is provided on the side of the separator box at the bottom of the vibrating screen, a coal-water mixture feed port and a gas discharge port are provided on the top of the separator box, the coal-water mixture feed port is connected to the discharge pipe, and variable frequency vibrators are provided at both ends of the vibrating screen.

3. The anti-blowout type underground coal mine high-pressure water jet penetration drilling and coal breaking permeability enhancement device according to any one of claims 1 or 2, characterized in that: A computer circuit board is arranged in the control cabinet, and the computer circuit board is connected with the flow meter, the high-pressure pump and the variable-frequency vibrator through an electric circuit.

4. The anti-blowout type underground coal mine high-pressure water jet penetration drilling and coal breaking permeability enhancement device according to claim 1 is characterized by: The liquid-filled capsule is a hollow capsule made of elastic rubber material. The liquid-filled capsule is placed in a liquid and gas recovery sealing hole pre-drilled on the rock layer at the bottom of the coal seam. High-pressure liquid is filled into the hollow capsule of the liquid-filled capsule to make the outer wall of the liquid-filled capsule expand and support the liquid and gas recovery sealing hole, thereby sealing the liquid and gas recovery sealing hole.

5. The anti-blowout type underground coal mine high-pressure water jet penetration drilling and coal breaking permeability enhancement device according to claim 2 is characterized by: The coal slag discharge port of the coal-water mixture separator is provided with a double-layer sealing curtain.

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