Coal mine underground depression angle extraction long drill hole positive pressure drainage device and method

Abstract

The invention discloses an underground coal mine depression angle extraction long drill hole positive pressure drainage device and method, and relates to the technical field of underground coal mine drainage, the underground coal mine depression angle extraction long drill hole positive pressure drainage device comprises a depression angle drill hole, a drainage pipe and an air inlet pipe, the drainage pipe and the air inlet pipe extend into the depression angle drill hole, and the lower portion and the upper portion in the depression angle drill hole are movably connected with a capsule hole sealing device and a two-plugging one-injection hole packer; the drainage pipe communicates with the capsule hole sealing device, and a filtering assembly is movably installed at the lower end of the capsule hole sealing device. According to the coal mine underground depression angle extraction long drill hole positive pressure drainage device and method, the capsule hole sealing device is controlled to be not expanded and normal extraction of the drill hole is achieved through valve control, in the drainage period, the capsule hole sealing device is controlled to be expanded, a drainage sealed space is formed, compressed air is injected into the sealed space, accumulated water is rapidly pressed out of the hole through the drainage pipe, and the drainage effect is achieved. The drainage problem of the depression angle extraction long drill hole is solved, accumulated water is filtered through the filtering assembly, a pipeline is not prone to being blocked, and the drainage process is smoother.

Description

Technical Field

[0001] The present invention relates to the technical field of underground coal mine drainage, and in particular to a long borehole positive pressure drainage device and method for depression angle extraction in underground coal mines. Background Art

[0002] Coal mine gas disaster is one of the main disasters affecting mine production safety. During construction, gas extraction from the original coal body through various forms of drilling is one of the main measures to prevent and control coal mine gas disasters. General gas extraction drilling holes are upward drilling or horizontal drilling, but under certain special geological and production conditions, it is necessary to construct depression extraction drilling holes for gas extraction. During the drilling construction process, a large amount of water enters the borehole. After the construction is completed, a hose is inserted into the borehole and compressed air is used to drain the accumulated water and coal slag at the bottom of the hole as much as possible. However, when the borehole is long, it is difficult to clean the water and coal slag at the bottom of the hole with compressed air alone. When the coal body is submerged under water, the gas it absorbs will be difficult to be extracted, and the extraction effect of the drilling hole will be greatly reduced. Especially when the overlying rock layer of the coal seam has a high water content, water will continue to seep into the hole. Therefore, the drainage work of the depression extraction drilling hole is a continuous process throughout the life cycle of the extraction drilling hole.

[0003] At present, there are three main ways to drain water from depression holes on site, but all of them have limitations: one is to blow pressurized air into the borehole for drainage, which is only applicable to short boreholes and has poor drainage effect for long boreholes; the second is to lay drainage pipes in the boreholes and seal the holes before injecting pressurized air for drainage. Although this can cope with longer boreholes, it is subject to the underground pressurized air pressure. For example, low underground pressure will lead to the inability to press out high vertical deep water. In addition, the drilling conditions of coal mines will cause a large number of cracks on the inner wall of the borehole. These cracks are prone to pressurized air leakage and cannot generate sufficient air pressure at the bottom of the borehole; the third is to use a water pump to pump water. Due to the influence of the water pump suction head and the resistance along the water pump pipe, the vertical depth of the borehole for effective drainage is low, and the mixture of accumulated water and coal powder is easy to block the pipe, resulting in drainage termination. In order to solve the above problems, a positive pressure drainage device and method for long boreholes for depression extraction in coal mines are disclosed. Summary of the Invention

[0004] The main purpose of the present invention is to provide a long-borehole positive pressure drainage device and method for low-angle extraction in coal mines, which can effectively solve the problems of limited pressure in the drainage space, difficulty in holding back the compressed air, and easy blockage of the drainage pipeline by turbid accumulated water.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A positive pressure drainage device and method for a long borehole in an underground coal mine for depression-angle extraction, comprising a depression-angle borehole, a drainage pipe, and an air intake pipe. The drainage pipe and the air intake pipe extend into the depression-angle borehole. A capsule sealing device and a two-blocking and one-injection sealing device are movably connected at the lower and upper positions of the depression-angle borehole. The drainage pipe and the capsule sealing device are interconnected, and a filter assembly is movably installed at the lower end of the capsule sealing device. The filter assembly also includes a filter cartridge, a connecting piece, a rotary rod, a rotor, a brush plate, a guide rod and a guide frame. The filter cartridge is movably connected to the connecting piece, the rotary rod is rotatably connected in the filter cartridge, the rotor is fixedly connected to one end of the rotary rod, the brush plate is movably installed on the side of the rotary rod, the guide rod is fixedly connected to the two end positions of the brush plate, the guide frame is fixedly connected to the inner wall of the filter cartridge, and the guide rod can be slidably connected to the guide frame.

[0006] By adopting the above technical solution, the water accumulation position is sealed by the capsule sealing device to form a drainage sealed space, so that the compressed air can directly act on the drainage sealed space, so that the gas reduces the seepage pressure, and the pressure in the drainage sealed space is easy to increase quickly, which is convenient for drainage; The filter assembly filters the accumulated water and removes larger particulate impurities, making the drain pipe less likely to be blocked. The filter cartridge in the filter assembly is easy to unclog, making the filter cartridge less likely to be blocked and able to maintain the drainage state for a longer period of time.

[0007] Preferably, a hollow pipe is provided in the capsule sealing device, and the two ends of the hollow pipe are respectively connected to the filter cartridge and the drain pipe, and the two sides of the capsule sealing device are fixedly connected with an expansion air outlet end and an expansion air inlet end, a one-way valve is fixedly connected to the expansion air outlet end, and the expansion air inlet end is connected to the air inlet pipe, and a capsule with a high expansion rate is provided on the surface of the capsule sealing device.

[0008] By adopting the above technical solution, the one-way valve is located below the capsule sealing device, and the capsule on the capsule sealing device expands to form a drainage sealing space in the drill hole.

[0009] Preferably, the two-blocking and one-injection sealing devices are fixedly connected with an extraction pipe, and the extraction pipe, drainage pipe and air intake pipe pass through the sealing bag of the two-blocking and one-injection sealing devices and extend out of the hole. The upper end of the drainage pipe extends out of the depression-angle drilled hole and is fixedly connected to a water collector, and a single-acting normally closed pneumatic valve 1 is fixedly connected to the drainage pipe at a side position of the water collector, a single-acting normally open pneumatic valve is fixedly connected to the extraction pipe, and the upper end of the extraction pipe is fixedly connected to the extraction pipeline, a tee is provided at the upper end of the air intake pipe, and the other two pipelines of the tee are respectively connected to the compressed air pipeline and the atmosphere, a single-acting normally closed pneumatic valve 2 is fixedly connected to the pipeline on the tee that is connected to the compressed air pipeline, and a single-acting normally closed pneumatic valve 3 is fixedly connected to the pipeline on the tee that is connected to the atmosphere.

[0010] By adopting the above technical solution, it is convenient to guide the accumulated water into the water collector, and the compressed air pipeline is convenient to press the gas into the air inlet pipe.

[0011] Preferably, the single-acting normally closed pneumatic valve one, the single-acting normally open pneumatic valve, the single-acting normally closed pneumatic valve two and the single-acting normally closed pneumatic valve three are located outside the depression angle drilling hole, and a pneumatic valve controller is installed outside the depression angle drilling hole. The pneumatic valve controller is electrically connected to the single-acting normally closed pneumatic valve one, the single-acting normally open pneumatic valve, the single-acting normally closed pneumatic valve two and the single-acting normally closed pneumatic valve three.

[0012] By adopting the above technical solution, the pneumatic valve controller can easily control each valve.

[0013] Preferably, the filter assembly further includes a chassis, a bearing, a hanging tube, a hanging hole, a bottom plate and a spring 1. The chassis is threadedly connected to the connecting piece, the hanging tube is rotatably connected to the chassis through a bearing, the hanging hole is opened on the hanging tube, the bottom plate is fixedly connected to the bottom position of the hanging tube, the spring 1 is located in the hanging tube, and one end of the spring 1 is fixedly connected to the bottom plate.

[0014] Preferably, the filter assembly further includes a limiting rod, which is fixedly connected to the other end of the rotating rod. The rotating rod is movably installed in the telescopic tube and compresses a spring 1 at the side position. The limiting rod is clamped in the hanging hole.

[0015] By adopting the above technical solution, the rotating rod can be easily inserted into the hanging pipe through the limiting rod, so that the rotating rod, rotor and other structures are easy to disassemble and replace.

[0016] Preferably, the filter assembly also includes a telescopic tube, a telescopic rod, a movable block, a second spring and a bristle bundle, the telescopic tube is fixedly connected to the rotary rod, one end of the telescopic rod is fixedly connected to the brush plate, and the other end of the telescopic rod is extended into the telescopic tube and fixedly connected to the movable block, the telescopic tube has a second spring movably installed at a side position of the movable block, and the bristle bundle is fixedly connected to the brush plate.

[0017] By adopting the above technical solution, the telescopic rod and the movable block in the telescopic tube are pushed outward by the second spring, so that the brush plate and the bristle bundle can be easily extended outward and contact the inner wall of the filter cartridge.

[0018] Preferably, the filter assembly further includes a filling pad, a slide and a guide frame, the slide is fixedly connected to one end of the filter cartridge, the filling pad is fixedly connected to one side of the connecting piece, the slide is movably mounted on the filling pad, the filter cartridge is provided with a plurality of groups of filter holes, and each group of filter holes is linearly arrayed on the filter cartridge, the guide frame is fixedly connected to the inner wall of the filter cartridge, the guide frames are distributed along the center array of the filter cartridge, and each group of filter holes is located between the guide frames.

[0019] Preferably, the filter assembly further includes a movable port, a movable rod and a limiting block, the movable port is opened on the connecting piece, the movable rod is fixedly connected to the side position of the slide, the movable rod is movably installed in the movable port, and the limiting block is fixedly connected to the outer end position of the movable rod.

[0020] By adopting the above technical solution, the slide slides on the filling pad, and the movable rod swings in the movable port, so that the filter cartridge can vibrate within a certain range to remove particles such as coal powder thereon.

[0021] A method for positive pressure drainage of a long borehole for depression-angle extraction in an underground coal mine comprises the following steps: Step 1: Construct a depression-angle borehole at the designed point underground. After the drilling is completed, remove the drill pipe and pressurize air into the depression-angle borehole through the drill pipe to initially blow out the accumulated water and coal slag. Then, install the filter assembly, drainage pipe, air inlet pipe, capsule sealing device and two-blocking and one-injection sealing device into the depression-angle borehole. The filter assembly is located at the bottom of the depression-angle borehole, and the capsule sealing device reaches the layer that needs to be drained. Step 2: The outside of the depression-angle borehole is connected to the extraction pipeline through the extraction pipeline and the single-acting normally open pneumatic valve. The drainage pipe is connected to the water collector through the single-acting normally closed pneumatic valve 1. The air inlet pipe is connected to one port of the tee. The other two ports of the tee are connected to the single-acting normally closed pneumatic valve 2 and the compressed air pipeline respectively. The single-acting normally closed pneumatic valve 3 is directly connected to the atmosphere. Step 3: When drilling water, the pneumatic valve controller closes the single-acting normally open pneumatic valve and opens the single-acting normally closed pneumatic valve 1 and the single-acting normally closed pneumatic valve 2. Downhole compressed air enters the capsule sealing device through the air inlet pipe. The high-expansion rate capsule on the surface of the capsule sealing device gradually expands. When the pressure in the expansion capsule is about to reach 0.5MPa, the expansion capsule has achieved a tight fit with the borehole wall, forming a drainage sealing space between the expansion capsule and the bottom of the borehole; Step 4: When the pressure inside the expanded capsule on the capsule sealing device is greater than 0.5MPa, the one-way valve opens, and the gas inside the capsule sealing device enters the drainage space through the expanded air outlet. At this time, the pressure inside the expanded capsule on the capsule sealing device will instantly drop below 0.5MPa, and the one-way valve closes. Pressurized air continues to flow in through the air inlet pipe, and this cycle repeats to increase the pressure in the drainage space. Step 5: When the pressure in the drainage space becomes greater and greater, the accumulated water will be forced into the filter assembly. The accumulated water enters the interior through the filter cartridge and is discharged into the water collector through the drain pipe. When the pressure in the drainage space is too high, the accumulated water will be discharged more turbulently, thereby driving the rotor in the filter cartridge to rotate, causing the rotary rod, brush plate, and bristle bundle to rotate synchronously. The brush plate slides on the guide frame through the guide rod. When the brush plate faces the position of the filter hole, the guide rod slides into the position between the guide frames, and the brush plate and bristle bundle extend forward to dredge the filter hole. When the brush plate moves away from the position of the filter hole, the guide rod slides onto the guide frame, causing the brush plate and bristle bundle to retract to the rear side, thereby avoiding damage caused by frequent friction between the brush bundle and the inner wall of the filter cartridge; Step 6: When the rotating rod of the filter cartridge rotates, the guide rods continuously slide on the guide frames, causing the filter cartridge to shake. The filter cartridge drives the slide to slide on the filling pad. The movable rods on the slide shake in the corresponding movable openings, causing the filter cartridge to vibrate, making it easier for the coal powder particles on it to fall out, making the filter holes of the filter cartridge less likely to be blocked and the drainage of accumulated water smoother; Step 7: After the accumulated water in the drainage sealing space is drained, the pneumatic valve controller closes the single-acting normally closed pneumatic valve 2 and opens the single-acting normally closed pneumatic valve 3. At this time, the gas pressure in the expansion capsule on the capsule sealing device is released, and the capsule sealing device returns to its original state; Step 8: If a single drainage process fails to drain all the accumulated water in the drainage sealing space, repeat steps 3 to 7. After the accumulated water is drained, close the installed single-acting normally closed pneumatic valve 1, single-acting normally closed pneumatic valve 2, and single-acting normally closed pneumatic valve 3 through the pneumatic valve controller, and open the single-acting normally open pneumatic valve installed on the extraction pipeline to achieve normal extraction.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, an expansion sealing device is used to establish a drainage sealing space, so that the compressed air can directly act on the drainage sealing space. Since the volume of the sealing space is limited and there are fewer crack channels, the seepage pressure of the compressed air is reduced. The compressed air can increase the pressure in the drainage sealing space in a relatively fast time and complete the drainage process through the drain pipe.

[0023] 2. The positive pressure drainage method for long-bore depression-angle extraction proposed in the present invention is widely used. It can be used not only in depression-angle drilling holes, but also in upward drilling holes and horizontal drilling holes in coal mines. The positive pressure drainage method for depression-angle drilling holes can be applied to extraction boreholes of different lengths and different apertures, and has strong applicability.

[0024] 3. In the present invention, during the drainage process, the filter assembly uses the turbulent water flow generated by high pressure to drive the rotor and the rotary rod to rotate, so that the bristle bundle can be extended forward to clear the filter holes during the rotation process, and the filter cartridge vibrates, so that the filter assembly can filter larger particles of impurities in the sewage, avoiding the clogging of the drain pipe by accumulated water containing a large number of larger particles, and the filter cartridge is not easy to be clogged, so that the filter assembly has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the overall structural diagram of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 Schematic cross-section of the filter cartridge of the present invention; Figure 4 This is a schematic structural diagram of the hanging pipe and the rotating rod of the present invention; Figure 5 is a schematic cross-sectional view of the telescopic tube of the present invention; Figure 6 A schematic cross-sectional view of the chassis of the present invention Figure 7 This is a schematic diagram of the disassembly of the hanging pipe of the present invention; Figure 8 is a schematic cross-sectional view of the connector of the present invention; Figure 9 It is a cross-sectional schematic diagram of another aspect of the filter cartridge of the present invention.

[0026] In the figure: 1. Angle drilling hole; 2. Filter assembly; 201. Filter cartridge; 202. Connector; 203. Chassis; 204. Bearing; 205. Hanging tube; 206. Hanging hole; 207. Bottom plate; 208. Spring 1; 209. Rotating rod; 210. Rotor; 211. Telescopic tube; 212. Telescopic rod; 213. Movable block; 214. Spring 2; 215. Brush plate; 216. Bristle bundle; 217. Guide rod; 218. Limiting rod; 219. Filling pad; 220. Movable opening; 221. Slide; 222. Movable rod; 223. Limiting block; 224. Guide frame; 3. Drain pipe; 4. Air inlet pipe; 5. Expansion outlet; 6. One-way valve; 7. Capsule sealing device; 8. Two-blocking and one-injection sealer; 9. Pumping pipeline; 10. Single-acting normally closed pneumatic valve 1; 11. Single-acting normally open pneumatic valve; 12. Single-acting normally closed pneumatic valve 2; 13. Single-acting normally closed pneumatic valve 3; 14. Pneumatic valve controller; 15. Water collector; 16. Pumping pipeline; 17. Compressed air pipeline. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] like Figures 1 to 9 As shown, a positive pressure drainage device for a long borehole for depression angle extraction in an underground coal mine comprises a depression angle borehole 1, a drainage pipe 3 and an air intake pipe 4. The drainage pipe 3 and the air intake pipe 4 extend into the depression angle borehole 1. A capsule sealing device 7 and a two-blocking and one-injection sealing device 8 are movably connected at the lower and upper positions of the depression angle borehole 1. The drainage pipe 3 and the air intake pipe 4 are bundled together. The drainage pipe 3, the air intake pipe 4, the capsule sealing device 7 and the two-blocking and one-injection sealing device 8 are pushed into the depression angle borehole 1 through a drill rod. The drainage pipe 3 and the capsule sealing device 7 are connected to each other, and a filter assembly 2 is movably installed at the lower end of the capsule sealing device 7.

[0029] The filter assembly 2 also includes a filter cartridge 201, a connecting piece 202, a rotary rod 209, a rotor 210, a brush plate 215, a guide rod 217 and a guide frame 224. The filter cartridge 201 is movably connected to the connecting piece 202, one end of the filter cartridge 201 is inserted into the connecting piece 202, the rotary rod 209 is rotatably connected to the filter cartridge 201, the rotor 210 is fixedly connected to one end of the rotary rod 209, the rotor 210 is located at the upper position of the filter cartridge 201, and the accumulated water enters the drain pipe 3 through the position of the rotor 210. The brush plate 215 is movably installed at the side position of the rotary rod 209, the guide rod 217 is fixedly connected to the two end positions of the brush plate 215, and the guide frame 224 is fixedly connected to the inner wall of the filter cartridge 201. The guide rod 217 can be slidably connected to the guide frame 224. The mutual sliding of the guide rod 217 and the guide frame 224 will cause the filter cartridge 201 to vibrate, making it easy to remove coal blocks on the filter cartridge 201.

[0030] A hollow pipe is provided in the capsule sealing device 7, and the two ends of the hollow pipe are respectively connected to the filter cartridge 201 and the drain pipe 3, so that the drain pipe 3 can easily lead the liquid in the filter cartridge 201 upward through the capsule sealing device 7. The two sides of the capsule sealing device 7 are fixedly connected with the expansion air outlet end 5 and the expansion air inlet end. The expansion air outlet end 5 is fixedly connected with a one-way valve 6. The one-way valve 6 is located above the accumulated water in the depression angle drill hole 1, and the expansion air inlet end is connected with the air inlet pipe 4. The surface of the capsule sealing device 7 is provided with a capsule with a high expansion rate. After the high expansion capsule is expanded, it is convenient for the capsule to fit together with the inner wall of the depression angle drill hole 1, thereby sealing the pipeline.

[0031] The two-blocking and one-injection sealing device 8 is fixedly connected with an extraction pipe 9, and the extraction pipe 9, the drainage pipe 3 and the air inlet pipe 4 pass through the sealing bag of the two-blocking and one-injection sealing device 8 and extend out of the hole. The upper end of the drainage pipe 3 extends out of the depression-angle drilled hole 1 and is fixedly connected to a water collector 15, and the drainage pipe 3 is fixedly connected to a single-acting normally closed pneumatic valve 10 at the side position of the water collector 15. The single-acting normally closed pneumatic valve 10 is used to open the drainage pipe 3, so that the accumulated water can easily enter the water collector 15. The extraction pipe 9 is fixedly connected with a single-acting normally open pneumatic valve 10. A pneumatic valve 11 is provided, and the upper end of the extraction pipeline 9 is fixedly connected with an extraction pipeline 16. The extraction pipeline 9 is used to suck the gas in the depression borehole 1. A tee is provided at the upper end of the air inlet pipe 4, and the other two pipelines of the tee are respectively connected to the compressed air pipeline 17 and the atmosphere. A single-acting normally closed pneumatic valve 2 12 is fixedly connected to the pipeline on the tee that is connected to the compressed air pipeline 17, and a single-acting normally closed pneumatic valve 3 13 is fixedly connected to the pipeline on the tee that is connected to the atmosphere. The single-acting normally closed pneumatic valve 3 13 is opened to be connected to the external atmosphere.

[0032] The single-acting normally closed pneumatic valve 10, the single-acting normally open pneumatic valve 11, the single-acting normally closed pneumatic valve 2 12 and the single-acting normally closed pneumatic valve 3 13 are located on the outside of the depression angle drilling hole 1. A pneumatic valve controller 14 is movably installed outside the depression angle drilling hole 1. The pneumatic valve controller 14 is electrically connected to the single-acting normally closed pneumatic valve 10, the single-acting normally open pneumatic valve 11, the single-acting normally closed pneumatic valve 2 12 and the single-acting normally closed pneumatic valve 3 13, so that the pneumatic valve controller 14 can easily control the opening and closing of the single-acting normally closed pneumatic valve 10, the single-acting normally open pneumatic valve 11, the single-acting normally closed pneumatic valve 2 12 and the single-acting normally closed pneumatic valve 3 13.

[0033] The filter assembly 2 also includes a chassis 203, a bearing 204, a hanging tube 205, a hanging hole 206, a bottom plate 207 and a spring 1 208. The chassis 203 is threadedly connected to the connecting piece 202, so that the chassis 203 and the connecting piece 202 are easy to install and disassemble. The hanging tube 205 is rotatably connected to the chassis 203 through the bearing 204, so that the hanging tube 205 can drive the rear rotary rod 209 to rotate. The hanging hole 206 is provided on the hanging tube 205, and the bottom plate 207 is fixedly connected to the bottom position of the hanging tube 205. The spring 1 208 is located in the hanging tube 205, and one end of the spring 1 208 is fixedly connected to the bottom plate 207. The spring 1 208 pushes the rotary rod 209, so that the limiting rod 218 is easy to clamp with the hanging hole 206, keeping the rotary rod 209 fixedly connected to the hanging tube 205.

[0034] The filter assembly 2 also includes a limiting rod 218, which is fixedly connected to the other end of the rotating rod 209. There are two limiting rods 218. The rotating rod 209 is movably installed in the telescopic tube 211 and compresses the spring 208 at the side position. The limiting rod 218 is clamped in the hanging hole 206. The number and position of the limiting rods 218 correspond to the number and position of the hanging holes 206.

[0035] The filter assembly 2 also includes a telescopic tube 211, a telescopic rod 212, a movable block 213, a second spring 214 and a bristle bundle 216. The telescopic tube 211 is fixedly connected to the rotating rod 209, one end of the telescopic rod 212 is fixedly connected to the brush plate 215, and the other end of the telescopic rod 212 extends into the telescopic tube 211 and is fixedly connected to the movable block 213. The movable block 213 increases the contact area with the second spring 214, making it easier for the second spring 214 to apply pressure, and the movable block 213 cannot pass through the through hole through which the telescopic rod 212 passes, so that the movable block 213 cannot be detached from the telescopic tube 211. The second spring 214 is movably installed in the telescopic tube 211 at the side of the movable block 213, and the bristle bundle 216 is fixedly connected to the brush plate 215. The bristle bundle 216 corresponds to the inner wall of the filter cartridge 201, so that the bristle bundle 216 can brush the filter holes on the inner wall of the filter cartridge 201.

[0036] The filter assembly 2 also includes a filling pad 219, a slide 221 and a guide frame 224. The slide 221 is fixedly connected to one end of the filter cartridge 201, the filling pad 219 is fixedly connected to one side of the connector 202, and the slide 221 is movably mounted on the filling pad 219. The filter cartridge 201 is provided with a plurality of groups of filter holes, and each group of filter holes is linearly arrayed on the filter cartridge 201. The guide frame 224 is fixedly connected to the inner wall of the filter cartridge 201. The guide frames 224 are distributed along the center array of the filter cartridge 201, and each group of filter holes is located between the guide frames 224, so that after the guide rod 217 on the brush plate 215 slides to the position between the guide frames 224, the guide rod 217 loses the resistance of the guide frame 224 and is pushed outward by the spring 214, so that the brush plate 215 and the brush bundle 216 move forward, and the brush bundle 216 is inserted into the filter holes between the guide frames 224, thereby clearing the filter holes.

[0037] The filter assembly 2 also includes a movable port 220, a movable rod 222 and a limiting block 223. The movable port 220 is opened on the connecting member 202. The movable rod 222 is fixedly connected to the side position of the slide 221. The movable rod 222 is movably installed in the movable port 220. The movable rod 222 swings left and right in the movable port 220. The limiting block 223 is fixedly connected to the outer end position of the movable rod 222. The limiting block 223 is located at the outer side of the connecting member 202. The limiting block 223 is used to prevent the movable rod 222 from detaching from the movable port 220.

[0038] It should be noted that the usage steps of the present invention are as follows: a depression borehole 1 is constructed at a designed point underground. After the drilling construction is completed, the drill rod is withdrawn and compressed air is pressed into the depression borehole 1 through the drill rod to initially blow the accumulated water and coal slag out of the hole. Since the inner wall of the depression borehole 1 contains a large number of cracks, a large amount of compressed air will enter these cracks, resulting in a large amount of accumulated water at the bottom position of the depression borehole 1. Then the filter component 2, the drain pipe 3, the air inlet pipe 4, the capsule sealing device 7 and the two-blocking and one-injection sealing device 8 are arranged in the depression borehole 1, the filter component 2 is located at the bottom position of the depression borehole 1, the filter component 2 is located at the water accumulation position at the bottom of the depression borehole 1, and the capsule sealing device 7 reaches the layer that needs to be drained.

[0039] The outside of the depression angle borehole 1 is connected to the extraction pipeline 9, the single-acting normally open pneumatic valve 11 and the extraction pipeline 16, and the drainage pipe 3 is connected through the single-acting normally closed pneumatic valve 10 and the water collector 15, so that the accumulated water at the bottom of the depression angle borehole 1 can enter the water collector 15 through the drainage pipe 3. The air intake pipe 4 is connected to one port of the tee, and the other two ports of the tee are respectively connected to the single-acting normally closed pneumatic valve 2 12 and the compressed air pipeline 17, and the single-acting normally closed pneumatic valve 3 13 is directly connected to the atmosphere, so that the compressed air pipeline 17 can easily pass the external gas into the depression angle borehole 1 through the air intake pipe 4. After the air intake pipe 4 is directly connected to the external atmosphere, the air pressure in the depression angle borehole 1 can be easily restored.

[0040] When the borehole is drained, the pneumatic valve controller 14 closes the single-acting normally open pneumatic valve 11, opens the single-acting normally closed pneumatic valve 1 10 and the single-acting normally closed pneumatic valve 2 12, and the downhole compressed air enters the capsule sealing device 7 through the air inlet pipe 4. The high-expansion rate capsule on the surface of the capsule sealing device 7 gradually expands. After the high-expansion capsule expands, it fits with the inner wall of the depression angle borehole 1, thereby sealing the depression angle borehole 1 above the filter component 2. When the pressure in the expansion capsule is about to reach 0.5MPa, the expansion capsule has been tightly fitted with the borehole wall, forming a drainage sealing space between the expansion capsule and the bottom of the borehole. By directly introducing gas into the drainage sealing space, direct ventilation of the depression angle borehole 1 as a whole is avoided.

[0041] When the pressure inside the expanded capsule on the capsule sealing device 7 is greater than 0.5MPa, the one-way valve 6 opens, and the gas in the capsule sealing device 7 enters the drainage sealing space through the expansion outlet end 5, thereby increasing the air pressure in the drainage sealing space. At this time, the pressure inside the expanded capsule on the capsule sealing device 7 will instantly drop below 0.5MPa, and the one-way valve 6 closes. The compressed air continues to flow in through the air inlet pipe 4, and so on. The pressure in the drainage space is increased, so that the air pressure at the water accumulation position where the filter component 2 is located is increased, which facilitates the discharge of the accumulated water into the hollow tube of the capsule sealing device 7, and then enters the drain pipe 3 through the hollow tube.

[0042] When the pressure in the drainage space becomes greater and greater, the accumulated water will be forced into the filter assembly 2, and the accumulated water will enter the interior through the filter cartridge 201. The filter cartridge 201 is provided with a large number of filter holes, so that the larger particles in the accumulated water are blocked by the filter holes at the external position and will not enter the hollow tube of the capsule sealing device 7 and the subsequent drainage pipe 3. The single-acting normally closed pneumatic valve 10 on the drainage pipe 3 is opened, and the accumulated water flows through the single-acting normally closed pneumatic valve 10 through the drainage pipe 3 and is discharged into the water collector 15 to collect the accumulated water at the bottom of the depression-angle drilled hole 1. When the pressure in the drainage space is too high, the drainage of the accumulated water will be more turbulent, thereby The rotor 210 in the filter cartridge 201 is driven to rotate, causing the rotary rod 209, the brush plate 215, and the bristle bundle 216 to rotate synchronously. The rotary rod 209 drives the hanging tube 205 to rotate through the bearing 204. The telescopic tube 211 on the side of the rotary rod 209 rotates, causing the telescopic tube 211 to drive the telescopic rod 212 and the brush plate 215 to rotate. The spring 214 in the telescopic tube 211 pushes the movable block 213 outward. The telescopic rod 212 is pushed by the movable block 213, making it easier for the brush plate 215 and the guide rod 217 to extend outward. The guide rod 217 slides along the guide frame 224 or the inner wall of the filter cartridge 201. After the guide rod 217 on the brush plate 215 slides to the position between the guide racks 224, the guide rod 217 slides to the inner wall of the filter cartridge 201, and the spring 214 pushes the brush plate 215 to extend outward, so that the brush plate 215 fits the inner wall of the filter cartridge 201, and the bristle bundle 216 is inserted into the corresponding position between the guide racks 224, thereby dredging the filter holes at that position. When the brush plate 215 moves away from the position of the filter holes, the guide rod 217 slides to the guide rack 224, so that the brush plate 215 and the bristle bundle 216 retract to the rear side, the telescopic rod 212 and the movable block 213 retract to the rear side, and the spring 214 is compressed again, thereby avoiding damage caused by frequent friction between the bristle bundle 216 and the inner wall of the filter cartridge 201.

[0043] When the rotary rod 209 of the filter cartridge 201 rotates, the guide rod 217 continuously slides on each guide frame 224, which will cause the filter cartridge 201 to shake. The filter cartridge 201 drives the slide 221 to slide on the filling pad 219, and the movable rod 222 on the slide 221 shakes in each corresponding movable opening 220. The limiting block 223 prevents each corresponding movable rod 222 from moving out of the movable opening 220, causing the filter cartridge 201 to vibrate, making it easier for the coal powder particles thereon to fall off outward, making the filter holes of the filter cartridge 201 less likely to be blocked and the drainage of accumulated water smoother.

[0044] When the accumulated water in the drainage sealing space is drained, the pneumatic valve controller 14 closes the single-acting normally closed pneumatic valve 2 12, stops pressing in the compressed air, and opens the single-acting normally closed pneumatic valve 3 13, so that the air inlet pipe 4 is directly connected to the external atmosphere. After the air inlet pipe 4 no longer takes in air, the air pressure in the capsule sealing device 7 will only continue to drop, thereby relieving the pressure of the gas in the expansion capsule and restoring the capsule sealing device 7 to its original state.

[0045] If a single drainage process fails to drain all the accumulated water in the drainage sealing space, repeat steps three to seven. After the accumulated water is drained, the pneumatic valve controller 14 is used to close the installed single-acting normally closed pneumatic valve 10, single-acting normally closed pneumatic valve 2 12, and single-acting normally closed pneumatic valve 3 13, and the single-acting normally open pneumatic valve 11 installed on the extraction pipeline 9 is opened to achieve normal extraction, thereby extracting gas and other gases in the depression borehole 1, which is convenient for subsequent coal mining.

[0046] After the filter assembly 2, capsule sealing device 7, drain pipe 3, air inlet pipe 4 and two-blocking and one-injection sealing device 8 and other structures are removed from the depression-angle drilled hole 1, the chassis 203 is rotated on the connecting piece 202 to remove the chassis 203 from the connecting piece 202, and drive the hanging pipe 205, the rotating rod 209 and the rotor 210 to move out of the filter cartridge 201 and the connecting piece 202, then the rotating rod 209 is pressed inward in the hanging pipe 205, and the rotating rod 209 is rotated so that the limiting rod 218 thereon slides out of the hanging hole 206, so that the rotating rod 209 is easy to disassemble from the hanging pipe 205, so that the rotating rod 209 and other structures are easy to disassemble and replace, thereby improving the convenience of maintenance.

[0047] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A positive pressure drainage device for a long borehole with a low-angle extraction method in an underground coal mine, comprising a low-angle borehole (1), a drainage pipe (3) and an air inlet pipe (4), characterized in that: The drainage pipe (3) and the air inlet pipe (4) extend into the depression-angle drilled hole (1); the lower and upper parts of the depression-angle drilled hole (1) are movably connected with a capsule sealing device (7) and a two-blocking and one-injection sealing device (8); the drainage pipe (3) and the capsule sealing device (7) are interconnected, and a filter assembly (2) is movably installed at the lower end of the capsule sealing device (7); The filter assembly (2) further comprises a filter cartridge (201), a connecting member (202), a rotary rod (209), a rotor (210), a brush plate (215), a guide rod (217) and a guide frame (224); the filter cartridge (201) is movably connected to the connecting member (202); the rotary rod (209) is rotatably connected in the filter cartridge (201); the rotor (210) is fixedly connected to one end of the rotary rod (209); the brush plate (215) is movably mounted on a side of the rotary rod (209); the guide rod (217) is fixedly connected to both ends of the brush plate (215); the guide frame (224) is fixedly connected to the inner wall of the filter cartridge (201); and the guide rod (217) is slidably connected to the guide frame (224).

2. The positive pressure drainage device for long borehole drainage at a depression angle in an underground coal mine according to claim 1, characterized in that: A hollow pipeline is provided in the capsule sealing device (7), and the two ends of the hollow pipeline are respectively connected to the filter cartridge (201) and the drain pipe (3). An expansion outlet end (5) and an expansion inlet end are fixedly connected to the two sides of the capsule sealing device (7). A one-way valve (6) is fixedly connected to the expansion outlet end (5). The expansion inlet end is connected to the inlet pipe (4). A capsule with a high expansion rate is provided on the surface of the capsule sealing device (7).

3. The long borehole positive pressure drainage device for depression angle extraction in underground coal mines according to claim 1, characterized in that: The two-blocking and one-injection sealing device (8) is fixedly connected to an extraction pipe (9), and the extraction pipe (9), the drainage pipe (3) and the air inlet pipe (4) pass through the sealing bag of the two-blocking and one-injection sealing device (8) and extend out of the hole. The upper end of the drainage pipe (3) extends out of the depression-angle drilled hole (1) and is fixedly connected to a water collector (15). The drainage pipe (3) is fixedly connected to a single-acting normally closed pneumatic valve (10) at a side position of the water collector (15). A single-acting normally open pneumatic valve (11) is connected, and the upper end of the extraction pipeline (9) is fixedly connected to the extraction pipeline (16), the upper end of the air inlet pipe (4) is provided with a tee, and the other two pipelines of the tee are respectively connected to the compressed air pipeline (17) and the atmosphere, the pipeline on the tee that is connected to the compressed air pipeline (17) is fixedly connected to the single-acting normally closed pneumatic valve 2 (12), and the pipeline on the tee that is connected to the atmosphere is fixedly connected to the single-acting normally closed pneumatic valve 3 (13).

4. The positive pressure drainage device for long borehole drainage at a depression angle in an underground coal mine according to claim 4, characterized in that: The single-acting normally closed pneumatic valve 1 (10), the single-acting normally open pneumatic valve (11), the single-acting normally closed pneumatic valve 2 (12) and the single-acting normally closed pneumatic valve 3 (13) are located outside the depression angle drilling hole (1), and a pneumatic valve controller (14) is movably installed outside the depression angle drilling hole (1). The pneumatic valve controller (14) is electrically connected to the single-acting normally closed pneumatic valve 1 (10), the single-acting normally open pneumatic valve (11), the single-acting normally closed pneumatic valve 2 (12) and the single-acting normally closed pneumatic valve 3 (13).

5. The long borehole positive pressure drainage device for depression angle extraction in underground coal mines according to claim 4, characterized in that: The filter assembly (2) further comprises a chassis (203), a bearing (204), a hanging tube (205), a hanging hole (206), a bottom plate (207) and a spring (208). The chassis (203) is threadedly connected to the connecting member (202). The hanging tube (205) is rotatably connected to the chassis (203) via the bearing (204). The hanging hole (206) is provided on the hanging tube (205). The bottom plate (207) is fixedly connected to the bottom of the hanging tube (205). The spring (208) is located in the hanging tube (205), and one end of the spring (208) is fixedly connected to the bottom plate (207).

6. The long borehole positive pressure drainage device for depression angle extraction in underground coal mines according to claim 5, characterized in that: The filter assembly (2) further includes a limiting rod (218), which is fixedly connected to the other end of the rotating rod (209). The rotating rod (209) is movably installed in the telescopic tube (211) and compresses the spring 1 (208) at the side position. The limiting rod (218) is clamped in the hanging hole (206).

7. The long borehole positive pressure drainage device for depression angle extraction in underground coal mines according to claim 6, characterized in that: The filter assembly (2) further comprises a telescopic tube (211), a telescopic rod (212), a movable block (213), a second spring (214) and a bristle bundle (216), wherein the telescopic tube (211) is fixedly connected to the rotary rod (209), one end of the telescopic rod (212) is fixedly connected to the brush plate (215), and the other end of the telescopic rod (212) extends into the telescopic tube (211) and is fixedly connected to the movable block (213), and the second spring (214) is movably installed in the telescopic tube (211) at a side position of the movable block (213), and the bristle bundle (216) is fixedly connected to the brush plate (215).

8. The long borehole positive pressure drainage device for depression angle extraction in underground coal mines according to claim 1, characterized in that: The filter assembly (2) further comprises a filling pad (219), a slide (221) and a guide frame (224), wherein the slide (221) is fixedly connected to one end of the filter cartridge (201), the filling pad (219) is fixedly connected to one side of the connector (202), the slide (221) is movably mounted on the filling pad (219), the filter cartridge (201) is provided with a plurality of groups of filter holes, and each group of filter holes is linearly arrayed on the filter cartridge (201), the guide frame (224) is fixedly connected to the inner wall of the filter cartridge (201), the guide frames (224) are distributed along the center of the filter cartridge (201), and each group of filter holes is located between the guide frames (224).

9. The long borehole positive pressure drainage device for depression angle extraction in underground coal mines according to claim 8, characterized in that: The filter assembly (2) further comprises a movable opening (220), a movable rod (222) and a limiting block (223); the movable opening (220) is provided on the connecting member (202); the movable rod (222) is fixedly connected to a side position of the slide (221); the movable rod (222) is movably mounted in the movable opening (220); and the limiting block (223) is fixedly connected to an outer end position of the movable rod (222).

10. A method for positive pressure drainage of long boreholes for depression angle extraction in underground coal mines, referring to the positive pressure drainage device for long boreholes for depression angle extraction in underground coal mines according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: construct a depression-angle borehole (1) at a designed point underground. After the drilling is completed, withdraw the drill rod and pressurize air into the depression-angle borehole (1) through the drill rod to initially blow out the accumulated water and coal slag. Then, install the filter assembly (2), the drainage pipe (3), the air inlet pipe (4), the capsule sealing device (7) and the two-blocking and one-injection sealing device (8) into the depression-angle borehole (1). The filter assembly (2) is located at the bottom of the depression-angle borehole (1), and the capsule sealing device (7) reaches the layer to be drained. Step 2: The outside of the depression-angle borehole (1) is connected to the extraction pipeline (9), the single-acting normally open pneumatic valve (11) and the extraction pipeline (16), the drainage pipe (3) is connected to the single-acting normally closed pneumatic valve 1 (10) and the water collector (15), the air inlet pipe (4) is connected to one port of the tee, and the other two ports of the tee are respectively connected to the single-acting normally closed pneumatic valve 2 (12) and the compressed air pipeline (17), and the single-acting normally closed pneumatic valve 3 (13) is directly connected to the atmosphere; Step 3: When the borehole is drained, the pneumatic valve controller (14) closes the single-acting normally open pneumatic valve (11), opens the single-acting normally closed pneumatic valve 1 (10) and the single-acting normally closed pneumatic valve 2 (12), and the downhole compressed air enters the capsule sealing device (7) through the air inlet pipe (4). The high expansion rate capsule on the surface of the capsule sealing device (7) gradually expands. When the pressure in the expansion capsule is about to reach 0.5 MPa, the expansion capsule has been tightly fitted with the borehole wall, forming a drainage sealing space between the expansion capsule and the bottom of the borehole; Step 4: When the pressure inside the expansion capsule of the capsule sealing device (7) is greater than 0.5 MPa, the one-way valve (6) opens, and the gas inside the capsule sealing device (7) enters the drainage space through the expansion outlet (5). At this time, the pressure inside the expansion capsule of the capsule sealing device (7) will instantly drop to below 0.5 MPa, and the one-way valve (6) will close. The compressed air will continue to flow in through the air inlet pipe (4), and this cycle will be repeated to increase the pressure in the drainage space. Step 5: When the pressure in the drainage space becomes larger and larger, the accumulated water will be forced into the filter assembly (2), and the accumulated water will enter the interior through the filter cartridge (201) and be discharged into the water collector (15) through the drainage pipe (3). When the pressure in the drainage space is too high, the accumulated water will be discharged more turbulently, thereby driving the rotor (210) in the filter cartridge (201) to rotate, so that the rotary rod (209), the brush plate (215), and the brush bundle (216) rotate synchronously. The brush plate (215) is moved on the guide frame (209) through the guide rod (217). 24), when the brush plate (215) faces the position of the filter hole, the guide rod (217) slides into the position between the guide frame (224), the brush plate (215) and the brush bundle (216) extend forward to dredge the filter hole, and when the brush plate (215) moves away from the position of the filter hole, the guide rod (217) slides onto the guide frame (224), so that the brush plate (215) and the brush bundle (216) shrink to the rear side, thereby avoiding damage caused by frequent friction between the brush bundle (216) and the inner wall of the filter cartridge (201); Step 6: When the rotating rod (209) of the filter cartridge (201) rotates, the guide rod (217) continuously slides on each guide frame (224), causing the filter cartridge (201) to shake. The filter cartridge (201) drives the slide (221) to slide on the filling pad (219), and the movable rod (222) on the slide (221) shakes in each corresponding movable opening (220), causing the filter cartridge (201) to vibrate, so that the coal powder particles on it are easy to fall out, so that the filter holes of the filter cartridge (201) are not easily blocked, and the accumulated water is drained more smoothly; Step 7: After the accumulated water in the drainage sealing space is drained, the pneumatic valve controller (14) closes the single-acting normally closed pneumatic valve 2 (12) and opens the single-acting normally closed pneumatic valve 3 (13). At this time, the gas in the expansion capsule on the capsule sealing device (7) is depressurized, and the capsule sealing device (7) returns to its original state. Step 8: If the single drainage process fails to drain all the accumulated water in the drainage sealing space, repeat steps 3 to 7. After the accumulated water is drained, close the installed single-acting normally closed pneumatic valve 1 (10), single-acting normally closed pneumatic valve 2 (12), and single-acting normally closed pneumatic valve 3 (13) through the pneumatic valve controller (14), and open the single-acting normally open pneumatic valve (11) installed on the extraction pipeline (9) to achieve normal extraction.

Images