Gas extraction device for replacing roadway with hole in coal mine

Abstract

The invention relates to the field of gas treatment equipment, in particular to a hole-replacing-roadway gas extraction device for a coal mine, the outer walls, located on the two sides of a pattern hole, of a narrow barrel part are scraped and cleaned through a blowing ring and a scraping ring which synchronously ascend and descend, and meanwhile, the interior of the pattern hole is blown and cleaned through a blowing hole formed in the blowing ring and a collecting cavity formed in the scraping ring, so that the hole-replacing-roadway gas extraction device for the coal mine is achieved. Coal briquette particles are collected, the dredging effect on the pattern holes is improved, meanwhile, a traditional dredging rod dredging mode is replaced, and backflow of the coal briquette particles is reduced; besides, a mechanical extrusion cleaning mode is replaced with a blowing cleaning mode, so that friction of mechanical parts is reduced, and the safety and the dredging effect of dredging the pattern holes are improved; in addition, through the collecting tank and the annular cavity and through cooperation of a second elastic valve and a third elastic valve, coal mine particles are pressurized and discharged in real time, and the dredging and collecting effects are further improved.

Description

Technical Field

[0001] This invention relates to a gas extraction device, and more particularly to a coal mine gas extraction device that uses boreholes instead of roadways, applicable to the field of gas treatment equipment. Background Technology

[0002] Gas drainage is a crucial aspect of safe coal mine production. Its principle is to remove gas from the coal seam and goaf through negative pressure suction or positive pressure drive, thereby reducing the underground gas concentration, eliminating the risk of explosion, and reducing greenhouse gas emissions. Drainage systems typically utilize boreholes, roadways, or buried pipes to construct airflow channels, and use drainage pumps to create a pressure difference, allowing the gas to flow along the channels to the surface. While roadway drainage involves a large amount of engineering work, borehole drainage is becoming increasingly popular for gas drainage.

[0003] A patent with publication number CN114320443B discloses a coal seam gas extraction device, involving a gas extraction borehole drilled within a coal seam drilling site. Its key feature is that it includes a gas extraction pipe assembly inserted into the borehole and a coal breaking and clearing mechanism detachably installed within the gas extraction pipe assembly. In this invention, the coal breaking and clearing structure clears collapsed and broken coal, solving the problem of blockage in the extraction pipe or borehole, effectively avoiding drill jamming, stuck drill, and poor dust discharge, thus improving the smoothness of gas extraction. Simultaneously, addressing the issues of collapse, subsidence, and deformation that easily occur during coal seam gas extraction, a double-layered gas extraction pipe assembly is designed. This improves the overall stability of the extraction pipeline and creates a larger gap between the inner and outer extraction pipes, thereby increasing the gas extraction flow rate.

[0004] The aforementioned prior art discloses a mechanical dredging component for mechanically squeezing and dredging blocked holes, solving the problem of holes being blocked by coal dust. However, in actual drilling and extraction processes, when there is water accumulation in the coal seam, the water and coal dust mix easily to form coal slurry when extraction is carried out using extraction pipes. The coal slurry contains coal particles. After mechanical squeezing and dredging by the dredging rod, due to the use of negative pressure extraction, the coal slurry containing coal particles is prone to flow back into the hole, resulting in poor dredging effect. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing gas extraction devices cannot solve the problem of coal slurry carrying coal particles backflow and clogging the openings by mechanical dredging.

[0006] To address the aforementioned problems, this invention provides a coal mine gas extraction device using boreholes instead of roadways, comprising an extraction pipe connected to an external extraction pump. The extraction pipe includes a pipe body and an extraction head fixed to the front end of the pipe body. The extraction head has a narrow cylindrical section near one end of the pipe body, with evenly distributed perforated holes on its circumferential sidewall. A blowing ring is slidably connected to the inner wall of the narrow cylindrical section, and a scraper ring is slidably connected to its outer wall, opposite to the blowing ring. Multiple piston cylinders are fixedly connected to their upper ends at the upper ends of both the blowing ring and the scraper ring. The upper ends of the multiple piston cylinders are fixedly connected to the same distribution cylinder, which is fixedly connected to the inner top wall of the extraction head. A fixed pipe extending into the pipe body is fixedly connected to the center of the lower end of the distribution cylinder. An air inlet pipe is fixedly connected to the lower end of the fixed pipe, and the air inlet pipe is connected to an external suction pump, which is connected to an external inert gas storage tank. The blowing ring has blowing holes that match the eyelet holes, the scraping ring has a collection chamber that matches the eyelet holes, a one-way valve is installed at the connection between the collection chamber and the eyelet holes, the outer wall of the fixed tube has multiple air inlets that match the blowing holes, and the fixed tube has multiple sets of first elastic valves that match the air inlets. The first elastic valves are fixedly connected to the inner wall of the fixed tube through a fixed plate. The first elastic valve includes a horizontal cylinder fixedly connected to a fixed plate, a first valve core slidably connected to the horizontal cylinder and inserted into the air inlet, a first spring abutting against the first valve core inside the horizontal cylinder, a magnetic column fixedly connected inside the first valve core, and a magnetic ring cooperating with the magnetic column fixedly connected inside the blow ring.

[0007] In the aforementioned coal mine gas extraction device that uses boreholes instead of roadways, the nozzles are cleaned by blowing and scraping rings, and coal particles are collected, thus overcoming the problem of coal particles flowing back and clogging the nozzles.

[0008] As a further improvement of this application, the scraper ring is provided with a discharge hole at the lower end of the collection chamber, which is connected to the collection chamber. A second elastic valve is provided in the discharge hole. A disc part is fixedly connected to the lower end of the narrow cylindrical part. A collection groove is provided at the upper end of the disc part. An annular cavity is provided on the side of the pipe body near the extraction head. The annular cavity is connected to the collection groove, and a third elastic valve is installed at the connection between the two. The third elastic valve and the second elastic valve are configured in cooperation. A discharge pipe is connected to the annular cavity, which extends to the outside of the extraction pipe and is connected to the external collection box.

[0009] As a further improvement of this application, the piston cylinder includes a hollow cylindrical cylinder body and a piston rod slidably connected to the cylinder body. The piston rod extends to the bottom of the cylinder body. The distribution cylinder is a hollow cylindrical structure, and the fixing tube is a hollow cylindrical structure.

[0010] As a further improvement of this application, both the blowing ring and the scraping ring are circular ring structures. The blowing ring is sleeved on the outside of the fixed tube and slides against its outer wall. The blowing hole is a horizontally set conical hole. A vertical through hole is opened on the blowing ring. The cavities of the extraction head located on the upper and lower sides of the blowing ring are connected through the vertical through hole.

[0011] As a further improvement of this application, both the magnet ring and the magnet post are permanent magnets and their magnetic properties are the same on opposite sides.

[0012] As a further improvement of this application, the second elastic valve includes a second valve core nested in the discharge hole, a movable rod fixedly connected to the upper end of the second valve core, a vertical cylinder fixedly connected to the top wall of the collection chamber slidably sleeved at the upper end of the movable rod, and a second spring abutting against the upper end of the movable rod inside the vertical cylinder; the disc portion has an upper hole communicating with the collection groove, and the tube body has a lower hole communicating with the upper hole and the annular cavity; the third elastic valve includes a radial rod fixedly connected to the inner wall of the upper hole, a third valve core slidably connected to the radial rod, a sleeve fixedly connected to the radial rod sleeved on the upper part of the third valve core, and a third spring abutting against the third valve core inside the sleeve.

[0013] As a further improvement of this application, the collection tank is an annular tank with an inverted isosceles trapezoidal cross-section.

[0014] As a further improvement of this application, the disc portion is fixedly connected to multiple circumferentially distributed grid bars on the outside of the collection tank, and the upper end of the grid bars is fixedly connected to the top wall of the narrow cylinder portion.

[0015] As a further improvement of this application, the second valve core has a frustum-shaped structure and multiple circumferentially distributed mud discharge holes, which vertically penetrate the second valve core.

[0016] In summary, this invention uses a synchronously rising and falling blowing ring and scraper ring to scrape and clean the outer walls of the narrow cylindrical section located on both sides of the perforation. Simultaneously, the blowing holes on the blowing ring and the collection chamber on the scraper ring clean the inside of the perforation and collect coal particles, improving the unblocking effect. Furthermore, it replaces the traditional unblocking rod method, reducing the backflow of coal particles. Additionally, using a blowing method to clean the perforation instead of a mechanical squeezing method reduces friction in mechanical parts, improving the safety and effectiveness of unblocking the perforation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present application; Figure 2 This is a schematic diagram of the transverse cross-sectional structure of this application; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 This is a cross-sectional view of the extraction head in this application; Figure 5 This is an assembly diagram of the blow ring and scraper ring in this application; Figure 6 This is a three-dimensional structural diagram of the blow ring in this application; Figure 7 A schematic diagram for blow-blowing cleaning of perforated holes; Figure 8 for Figure 2 Enlarged structural diagram at point B; Figure 9 This is a three-dimensional cross-sectional view of the third resilient valve in this application; Figure 10 This is a three-dimensional sectional view of the tube body in this application; Figure 11 This is a cross-sectional view of the first resilient valve in this application; Figure 12 This is a schematic diagram showing the transfer of coal particles from the collection chamber to the annular chamber in this application.

[0018] Explanation of the labels in the diagram: 1. Extraction pipe; 101. Pipe body; 1011. Annular cavity; 1012. Lower hole; 102. Extraction head; 1021. Narrow cylindrical section; 1022. Eyelet; 1023. Disc section; 1024. Collection trough; 1025. Upper hole; 2. Fixed pipe; 201. Air inlet; 3. Blow ring; 301. Blow hole; 302. Magnetic ring; 303. Through hole; 4. Scraper ring; 401. Collection cavity; 402. One-way valve; 403. Discharge hole; 5. Piston cylinder; 6. Distribution cylinder; 7. 8. Inlet pipe; 9. First elastic valve; 10. Horizontal cylinder; 11. First valve core; 11. First spring; 12. Magnet column; 13. Fixed plate; 14. Grille bar; 15. Second elastic valve; 16. Second valve core; 17. Moving rod; 18. Vertical cylinder; 19. Second spring; 10. Mud discharge hole; 11. Third elastic valve; 12. Third valve core; 13. Radial rod; 14. Sleeve; 15. Third spring; 16. Discharge pipe. Detailed Implementation

[0019] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0020] Implementation method 1: Figure 1-7This invention discloses a coal mine gas extraction device using boreholes instead of roadways, comprising an extraction pipe 1 connected to an external extraction pump. The extraction pipe 1 includes a pipe body 101 and an extraction head 102 fixed to the front end of the pipe body 101. The extraction head 102 has a narrow cylindrical section 1021 near the end of the pipe body 101, and the circumferential sidewall of the narrow cylindrical section 1021 has evenly distributed perforated holes 1022. A blow-off ring 3 is slidably connected to the inner wall of the narrow cylindrical section 1021, and a scraper ring 4 is slidably connected to its outer wall opposite to the blow-off ring 3. The upper ends of the blow-off ring 3 and the scraper ring 4 are respectively fixedly connected to the movable ends of multiple piston cylinders 5, and the upper ends of the multiple piston cylinders 5 are fixedly connected to the same distribution cylinder. 6. The distribution cylinder 6 is fixedly connected to the inner top wall of the extraction head 102; a fixed pipe 2 extending into the pipe body 101 is fixedly connected to the center of the lower end of the distribution cylinder 6, and an air inlet pipe 7 is fixedly connected to the lower end of the fixed pipe 2. The air inlet pipe 7 is connected to an external suction pump, and the suction pump is connected to an external inert gas storage tank; the external suction pump injects the inert gas in the inert gas storage tank into the fixed pipe 2 through the air inlet pipe 7, and the inert gas enters the distribution cylinder 6 through the fixed pipe 2. The inert gas enters the distribution cylinder 6 and then enters the piston cylinder 5, which is fixedly connected to the blowing ring 3 and the scraping ring 4 respectively. Multiple piston cylinders 5 drive the blowing ring 3 and the scraping ring 4 to move up and down synchronously. Please see Figure 3 The blowing ring 3 has a blowing hole 301 that matches the eyelet 1022. The scraper ring 4 has a collection chamber 401 that matches the eyelet 1022. A one-way valve 402 is installed at the connection between the collection chamber 401 and the eyelet 1022. The outer wall of the fixed tube 2 has multiple air inlets 201 that match the blowing hole 301. When the blowing ring 3 and the scraper ring 4 move to the position of the eyelet 1022, the air inlets 201 connect with the eyelet 1022 through the blowing hole 301, and the eyelet 1022 connects with the collection chamber 401. The fixed tube 2 has multiple sets of first elastic valves 8 that match the air inlets 201. The first elastic valves 8 are fixedly connected to the inner wall of the fixed tube 2 through the fixed plate 9. Please see Figure 3 The first elastic valve 8 includes a horizontal cylinder 801 fixedly connected to the fixed plate 9. The horizontal cylinder 801 is slidably connected to a first valve core 802 inserted into the air inlet 201. The horizontal cylinder 801 is provided with a first spring 803 that abuts against the first valve core 802. A magnet post 804 is fixedly connected inside the first valve core 802. A magnet ring 302 that cooperates with the magnet post 804 is fixedly connected inside the blow ring 3. When the blow hole 301 and the air inlet 201 are opposite each other, the magnet ring 302 pushes the magnet post 804 away from the air inlet 201, so that the air inlet 201 and the blow hole 301 are connected.

[0021] For details, please refer to Figure 7When coal lumps in the coal seam cause blockage of the perforation 1022, the external suction air pump is activated. The external suction air pump injects inert gas from the external inert gas storage tank into the fixed pipe 2 through the air inlet pipe 7, and then into the piston cylinder 5 through the distribution cylinder 6. The piston cylinder 5 pushes the injection ring 3 and scraper ring 4 to slide up and down synchronously inside and outside the narrow cylinder 1021 (adding inert gas into the piston cylinder 5, the injection ring 3 and scraper ring 4 move downward synchronously, extracting inert gas from the piston cylinder 5, the injection ring 3...). (Scraping ring 4 moves upward synchronously) Scraping ring 4 scrapes and cleans the outer wall of narrow cylinder 1021. At the same time, when the blowing ring 3 and scraping ring 4 move to the position of the eye hole 1022, under the action of magnetic ring 302 and magnetic column 804, air inlet 201 and blowing hole 301 are connected. Inert gas is blown into eye hole 1022 through blowing hole 301 and blows the cleaned coal block into collection chamber 401 to collect the coal block, thereby clearing eye hole 1022 and collecting coal block particles.

[0022] Compared to traditional gas extraction devices, this invention uses synchronously rising and falling injection rings 3 and scraper rings 4 to scrape and clean the outer walls of the narrow cylinder 1021 located on both sides of the perforation 1022. Simultaneously, injection holes 301 on the injection ring 3 and collection chambers 401 on the scraper ring 4 are used to clean the inside of the perforation 1022 and collect coal particles, improving the unblocking effect of the perforation 1022. This also replaces the traditional unblocking rod method, reducing the backflow of coal particles. Furthermore, by providing multiple piston cylinders 5 connected to the injection ring 3 and scraper ring 4 respectively, and a distribution cylinder 6 fixedly connected to the multiple piston cylinders 5, synchronous movement of the injection ring 3 and scraper ring 4 is achieved. This, combined with the first elastic valve 8 and the air inlet 201 on the fixed pipe 2, allows for the injection and injection of inert gas, reducing friction of mechanical parts and improving the safety and effectiveness of unblocking the perforation 1022.

[0023] Please see Figure 4-6 The piston cylinder 5 includes a hollow cylindrical cylinder body and a piston rod that is slidably connected to the cylinder body. The piston rod extends to the bottom of the cylinder body. The distribution cylinder 6 is a hollow cylindrical structure, and the fixing tube 2 is a hollow cylindrical structure.

[0024] Specifically, when inert gas is injected into the cylinder, it pushes the piston rod to extend outward, thus achieving synchronous pushing of the blow ring 3 and the scraper ring 4.

[0025] Please see Figure 6 Both the blowing ring 3 and the scraping ring 4 are circular ring structures. The blowing ring 3 is sleeved on the outside of the fixed pipe 2 and slides against its outer wall. The blowing hole 301 is a horizontally set conical hole. A vertical through hole 303 is opened on the blowing ring 3. The cavities of the extraction head 102 located on the upper and lower sides of the blowing ring 3 are connected through the vertical through hole 303.

[0026] Specifically, when the inert gas is injected through the horizontally conical injection hole 301, the inert gas is compressed to improve the injection effect. In addition, when the injection ring 3 moves downward, the eyelet 1022 of the narrow cylinder 1021 above the injection ring 3 can still perform coal slime suction and gas suction. The gas and coal slime entering the injection ring 3 flow downward through the vertical through hole 303.

[0027] Please see Figure 3 Both the magnet ring 302 and the magnet column 804 are permanent magnets and have the same magnetism on opposite sides.

[0028] Specifically, the movement of the first valve core 802 is achieved by utilizing the magnetic repulsion between the magnet ring 302 and the magnet post 804.

[0029] The second implementation method: Figure 1-3 and Figure 8-12 This invention discloses a coal mine gas extraction device using boreholes instead of roadways. Based on the first embodiment, a scraper ring 4 is located at the lower end of a collection chamber 401 and has a discharge hole 403 communicating with the collection chamber 401. A second elastic valve 11 is installed inside the discharge hole 403. A disc portion 1023 is fixedly connected to the lower end of a narrow cylindrical portion 1021. A collection groove 1024 is opened at the upper end of the disc portion 1023. An annular cavity 1011 is opened on the side of the pipe body 101 near the extraction head 102. The annular cavity 1011 communicates with the collection groove 1024, and a third elastic valve 12 is installed at the connection between the two. The third elastic valve 12 and the second elastic valve 11 are configured to cooperate. When the two are in contact, the collection chamber 401 communicates with the annular cavity 1011 through the collection groove 1024. A discharge pipe 13 is connected to the annular cavity 1011, extending to the outside of the extraction pipe 1 and communicating with an external collection box.

[0030] For details, please refer to Figure 2 and Figure 12 The coal particles cleaned from the perforated hole 1022 are collected through the collection chamber 401. When the piston cylinder 5 pushes the blowing ring 3 and scraper ring 4 to the position of the lowest perforated hole 1022, the second elastic valve 11 squeezes the third elastic valve 12 to realize the connection between the collection chamber 401 and the annular cavity 1011, and discharges the coal particles in the collection chamber 401 into the annular cavity 1011, thereby improving the collection effect of the coal particles. At the same time, the blowing airflow is injected into the collection chamber 401 to blow the coal slurry and coal particles in the collection chamber 401 and the collection trough 1024, further improving the collection effect of the coal particles and coal slurry, and the coal particles and coal slurry are pressurized and discharged in real time.

[0031] Please see Figure 2 and Figure 8The second elastic valve 11 includes a second valve core 1101 nested in the discharge hole 403. A moving rod 1102 is fixedly connected to the upper end of the second valve core 1101. A vertical cylinder 1103 fixedly connected to the top wall of the collection chamber 401 is slidably sleeved on the upper end of the moving rod 1102. A second spring 1104 is provided inside the vertical cylinder 1103, which abuts against the upper end of the moving rod 1102. The disc portion 1023 has an upper hole 1025 communicating with the collection groove 1024. The tube body 101 has a lower hole 1012 that connects the upper hole 1025 and the annular cavity 1011; the third elastic valve 12 includes a radial rod 1202 that is fixedly connected to the inner wall of the upper hole 1025, a third valve core 1201 that is slidably connected to the radial rod 1202, a sleeve 1203 that is fixedly connected to the radial rod 1202 is sleeved on the upper part of the third valve core 1201, and a third spring 1204 that abuts against the third valve core 1201 is provided inside the sleeve 1203.

[0032] Specifically, when the second elastic valve 11 and the third elastic valve 12 come into contact, the second valve core 1101 squeezes the third valve core 1201, the collection chamber 401 is connected to the collection trough 1024 through the discharge hole 403, and the collection trough 1024 is connected to the annular cavity 1011 through the upper hole 1025 and the lower hole 1012.

[0033] Please see Figure 8 The collection tank 1024 is an annular tank with an inverted isosceles trapezoidal cross-section.

[0034] Specifically, the annular groove with an inverted isosceles trapezoidal cross-section collects the coal particles hanging from the scraper ring 4 and the coal slurry and coal particles discharged from the collection chamber 401, thereby further improving the collection and discharge effect of coal particles.

[0035] Please see Figure 11 The second valve core 1101 has a frustum-shaped structure and multiple circumferentially distributed mud discharge holes 1105, which vertically penetrate the second valve core 1101.

[0036] Specifically, when the second valve core 1101 and the third valve core 1201 are not in contact, the impurities discharged into the collection chamber 401 include coal slurry and coal particles entrained in the coal slurry. Through the slurry discharge hole 1105, high-pressure inert gas is used to discharge the coal slurry from the slurry discharge hole 1105, thereby improving the collection capacity of the collection chamber 401.

[0037] Please see Figure 1 The disc portion 1023 is located outside the collection tank 1024 and is fixedly connected to multiple circumferentially distributed grid rods 10. The upper end of the grid rods 10 is fixedly connected to the top wall of the narrow cylindrical portion 1021, and the grid rods 10 pass through the scraper ring 4 and are slidably connected to the scraper ring 4.

[0038] Specifically, the grid bars 10 arranged in a circular pattern form a grid mesh, which blocks large pieces of coal and reduces the blockage of the perforations 1022 by large particles caused by coal mine collapse.

[0039] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A coal mine gas extraction device that uses boreholes instead of roadways, characterized in that, The system includes a extraction pipe (1) connected to an external extraction pump. The extraction pipe (1) includes a pipe body (101) and an extraction head (102) fixed to the front end of the pipe body (101). The extraction head (102) has a narrow cylindrical section (1021) near the pipe body (101). The circumferential sidewall of the narrow cylindrical section (1021) has evenly distributed perforated holes (1022). A blower ring (3) is slidably connected to the inner wall of the narrow cylindrical section (1021), and a scraper ring (4) is slidably connected to its outer wall opposite to the blower ring (3). The upper ends of the blow ring (3) and the scraper ring (4) are respectively fixedly connected to the movable ends of multiple piston cylinders (5). The upper ends of the multiple piston cylinders (5) are fixedly connected to the same distribution cylinder (6). The distribution cylinder (6) is fixedly connected to the inner top wall of the extraction head (102). The lower center of the distribution cylinder (6) is fixedly connected to a fixed pipe (2) extending into the pipe body (101). The lower end of the fixed pipe (2) is fixedly connected to an air inlet pipe (7). The air inlet pipe (7) is connected to an external suction pump. The suction pump is connected to an external inert gas storage tank. The blow ring (3) has a blow hole (301) that matches the eyelet (1022). The scraper ring (4) has a collection chamber (401) that matches the eyelet (1022). A one-way valve (402) is installed at the connection between the collection chamber (401) and the eyelet (1022). The outer wall of the fixed tube (2) has multiple air inlets (201) that match the blow hole (301). The fixed tube (2) has multiple sets of first elastic valves (8) that match the air inlets (201). The first elastic valves (8) are fixedly connected to the inner wall of the fixed tube (2) through the fixed plate (9). The first elastic valve (8) includes a horizontal cylinder (801) fixedly connected to the fixed plate (9), a first valve core (802) slidably connected to the horizontal cylinder (801) and inserted into the air inlet (201), a first spring (803) abutting against the first valve core (802) is provided in the horizontal cylinder (801), a magnet column (804) is fixedly connected in the first valve core (802), and a magnet ring (302) cooperating with the magnet column (804) is fixedly connected in the blow ring (3).

2. A coal mine gas extraction device using boreholes instead of roadways according to claim 1, characterized in that, The scraper ring (4) is located at the lower end of the collection chamber (401) and has a discharge hole (403) communicating with the collection chamber (401). A second elastic valve (11) is provided in the discharge hole (403). A disc part (1023) is fixedly connected to the lower end of the narrow cylindrical part (1021). A collection groove (1024) is provided at the upper end of the disc part (1023). An annular cavity (1011) is provided on the side of the pipe body (101) near the extraction head (102). The annular cavity (1011) communicates with the collection groove (1024) and a third elastic valve (12) is installed at the connection between the two. The third elastic valve (12) and the second elastic valve (11) are configured in cooperation. A discharge pipe (13) is connected to the annular cavity (1011) and extends to the outside of the extraction pipe (1) and communicates with the external collection box.

3. A coal mine gas extraction device using boreholes instead of roadways according to claim 1, characterized in that, The piston cylinder (5) includes a hollow cylindrical cylinder body and a piston rod that is slidably connected to the cylinder body. The piston rod extends to the bottom of the cylinder body. The distribution cylinder (6) is a hollow cylindrical structure, and the fixing tube (2) is a hollow cylindrical structure.

4. A coal mine gas extraction device using boreholes instead of roadways according to claim 1, characterized in that, Both the blowing ring (3) and the scraping ring (4) are circular ring structures. The blowing ring (3) is sleeved on the outside of the fixed tube (2) and slides against its outer wall. The blowing hole (301) is a horizontally set conical hole. A vertical through hole (303) is opened on the blowing ring (3). The cavity of the extraction head (102) located on the upper and lower sides of the blowing ring (3) is connected through the vertical through hole (303).

5. A coal mine gas extraction device using boreholes instead of roadways according to claim 1, characterized in that, Both the magnet ring (302) and the magnet post (804) are permanent magnets and have the same magnetism on opposite sides.

6. A coal mine gas extraction device using boreholes instead of roadways according to claim 2, characterized in that, The second elastic valve (11) includes a second valve core (1101) nested in the discharge hole (403). A moving rod (1102) is fixedly connected to the upper end of the second valve core (1101). A vertical cylinder (1103) fixedly connected to the top wall of the collection chamber (401) is slidably sleeved on the upper end of the moving rod (1102). A second spring (1104) is provided inside the vertical cylinder (1103) and abuts against the upper end of the moving rod (1102). The disc part (1023) is provided with an upper hole (1025) communicating with the collection groove (1024). The tube body (101) is provided with a lower hole (1012) that connects the upper hole (1025) and the annular cavity (1011); the third elastic valve (12) includes a radial rod (1202) fixedly connected to the inner wall of the upper hole (1025), the radial rod (1202) is slidably connected to a third valve core (1201), the upper part of the third valve core (1201) is sleeved with a sleeve (1203) fixedly connected to the radial rod (1202), and a third spring (1204) is provided inside the sleeve (1203) that abuts against the third valve core (1201).

7. A coal mine gas extraction device using boreholes instead of roadways according to claim 2, characterized in that, The collection trough (1024) is an annular trough, and its cross-section is an inverted isosceles trapezoid.

8. A coal mine gas extraction device using boreholes instead of roadways according to claim 2, characterized in that, The disc portion (1023) is located outside the collection trough (1024) and is fixedly connected to multiple circumferentially distributed grid bars (10). The upper end of the grid bars (10) is fixedly connected to the top wall of the narrow cylindrical portion (1021).

9. A coal mine gas extraction device using boreholes instead of roadways according to claim 6, characterized in that, The second valve core (1101) has a frustum-shaped structure and multiple circumferentially distributed mud discharge holes (1105) are provided. The mud discharge holes (1105) vertically penetrate the second valve core (1101).

Images