Coal mine underground gas extraction filtering device and method

Abstract

The application belongs to the technical field of underground coal mine gas extraction, and discloses a coal mine underground gas extraction filtering device and method, which comprises a collecting cylinder, the bottom end of the collecting cylinder is fixedly provided with a first bottom shell and a second bottom shell, the surface of the collecting cylinder is provided with an air inlet hole, and the inside of the second bottom shell is rotatably provided with a first conveying wheel, a second conveying wheel and a third conveying wheel located in the first bottom shell. The spring elastic recovery will push the extrusion wheel upward, so that the extrusion wheel and the fixed wheel cooperate with each other, thereby extruding the water absorption belt, and the absorbed liquid in the water absorption belt is squeezed out; compared with the traditional device, the device can timely absorb the condensed water droplets, avoid the water droplets from gathering in the inside of the collecting cylinder, timely discharge the gathered water, avoid the water source from accumulating in the inside of the collecting cylinder, avoid the extraction pipeline from being blocked, and improve the gas extraction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of underground gas extraction technology in coal mines, specifically a gas extraction and filtration device and method for underground coal mines. Background Technology

[0002] Because coal seams contain methane gas, pre-extraction is necessary before mining to prevent coal and gas outbursts, gas explosions, and other disasters during the mining process. Pre-extraction typically employs negative pressure extraction, drilling deep holes into the coal seam along the roadway to extract the methane. Since the methane in the coal seam is located deep underground and influenced by the underground environment, it contains a certain amount of moisture. Whether using in-seam or cross-seam drilling, the methane gas condenses into water droplets on the inner wall of the extraction pipe during the extraction process. Due to the oblique distribution of the extraction pipe, the condensed water droplets converge downwards. When a large number of water droplets accumulate, they come into contact with coal slag and dust inside the pipe, clogging the extraction pipeline. Therefore, it is crucial to improve and optimize the extraction pipeline to prevent clogging during subsequent coal seam methane extraction operations. Summary of the Invention

[0003] The purpose of this invention is to provide a coal mine underground gas extraction and filtration device and method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a coal mine underground gas extraction and filtration device, comprising a collection cylinder, a first bottom shell and a second bottom shell fixedly installed at the bottom end of the collection cylinder, an air inlet hole on the surface of the collection cylinder, a first transmission wheel, a second transmission wheel and a third transmission wheel rotatably installed inside the second bottom shell, the first transmission wheel, the second transmission wheel and the third transmission wheel being connected by a water absorption belt, a fixed wheel rotatably installed inside the second bottom shell and located inside the water absorption belt, a fixed block fixedly installed inside the second bottom shell, a squeezing wheel rotatably installed inside the fixed block and located below the water absorption belt, a groove opened inside the fixed block, a slider slidably installed inside the groove and rotatably connected to the squeezing wheel, a first vertical rod penetrating the slider fixedly installed inside the groove, a spring elastically connected to the bottom end of the slider on the outer surface of the first vertical rod, a motor with an output shaft and a transmission connection to the first transmission wheel fixedly installed on the front of the second bottom shell, a water outlet opened between the collection cylinder and the first bottom shell, and a liquid collection box fixedly installed inside the second bottom shell.

[0005] Workers tilted the collection cylinder and the first bottom shell and connected them to the extraction pipeline. They then started the external air pump to evacuate the inside of the collection cylinder, creating a negative pressure environment. This negative pressure allowed them to draw in coal mine gas through the air inlet. The gas, carrying moisture, condensed into water droplets as it entered the collection cylinder. These droplets dripped downwards and entered the first bottom shell through the outlet, where they came into contact with and were absorbed by the suction belt. The motor was then started, causing the first conveyor wheel to rotate, which in turn rotated the suction belt, immersing... The permeable absorbent belt moves to the fixed wheel and the squeezing wheel. Through the spring's restoring force, it pushes the squeezing wheel upward, causing the squeezing wheel and the fixed wheel to work together to squeeze the absorbent belt. This squeezes out the absorbed liquid inside the absorbent belt, which drips into the collection box for collection. Compared with traditional devices, this device absorbs the condensed water droplets in time, preventing water droplets from accumulating inside the collection tube. This allows the accumulated water to be discharged in time, preventing water from accumulating inside the collection tube, preventing the air inlet from being blocked, and improving the gas extraction efficiency.

[0006] Preferably, a vent pipe is inserted inside the collection tube, one end of which penetrates the collection tube. A leak-proof block is fixedly fitted onto the outer surface of the vent pipe, and the leak-proof block penetrates both the inner and outer sides of the collection tube. A miniature water pump is fixedly installed inside the second bottom shell, one end of which is connected to the inside of the liquid collection box, and the other end of which is connected to the leak-proof block through a water pipe. An air vent is provided on the top of the leak-proof block.

[0007] Workers activate a miniature water pump, which draws water from the collection box and delivers it through a water pipe to the leak-proof block, filling it with liquid. The pump stops just before the liquid overflows through the vent. Unlike traditional devices, this system utilizes the squeezed-out water to create a water seal between the leak-proof block and the collection cylinder, preventing gas from leaking out through the gap. Furthermore, in extreme cases, if gas does leak through the seal, bubbles will form at the water seal, allowing workers to detect leaks promptly and ensure their safety.

[0008] Preferably, the outer end of the vent pipe is fixedly connected to a cleaning box, a partition is fixedly installed inside the cleaning box, a top block is fixedly installed at the top of the inner cavity of the cleaning box, a filter screen is movably installed inside the cleaning box, the bottom end of the filter screen penetrates the partition downwards, and a float is fixedly installed at the bottom end of the filter screen.

[0009] Moist gas containing impurities is introduced into the impurity removal chamber through a vent pipe. As it passes through the filter screen, the impurities are filtered out and isolated on the outer surface of the screen. Simultaneously, moisture in the gas accumulates as droplets on and inside the screen. These droplets flow downwards through the gap between the baffle and the screen to the bottom of the chamber for storage. As the liquid level rises, buoyancy causes a float to move the entire filter screen upwards, gradually raising the lower part of the screen to prevent clogging and reduced filtration efficiency. Compared to traditional devices, this invention utilizes the liquid collected during the secondary moisture removal process of the moist gas. This liquid, in conjunction with a float, uses buoyancy to drive the unused screen below the baffle upwards, replacing the impurity-laden screen above the baffle and continuing filtration of the moist gas. This effectively improves the filtration efficiency and quality of the filter.

[0010] Preferably, a limiting groove is provided on both sides of the top block, and a limiting block is slidably installed inside the limiting groove. The limiting block is fixedly connected to the filter screen. Due to the design of the limiting groove, the filter screen can play a good limiting role, making the filter screen move upward more smoothly and facilitating the filtration of humid gas.

[0011] Preferably, a diversion block and an arc block are fixedly installed inside the collection tube, and a second vertical rod is fixedly installed at the top of the inner cavity of the collection tube. Due to the design of the second vertical rod, the arc block, and the diversion block, the contact area with the humid gas is increased by the second vertical rod, thereby increasing the accumulation speed of moisture in the humid gas. The arc block and the diversion block guide the droplets, making the liquid flow downward more smoothly and avoiding contact with the air inlet and causing blockage.

[0012] Preferably, a sealing ring is provided at the connection between the leak-proof block and the collection tube. The sealing ring is circular in shape. Due to the design of the sealing ring, it can achieve a good sealing effect between the leak-proof block and the collection tube, preventing gas from leaking out.

[0013] Preferably, a drying mechanism is provided inside the second bottom shell. The drying mechanism is in contact with the outer surface of the absorbent belt. Due to the design of the drying mechanism, when the drying mechanism is activated, the position in contact with the absorbent belt is dried, thereby drying the absorbent belt that has been squeezed for water, so as to facilitate the subsequent absorption of water droplets.

[0014] Preferably, a purification box is provided on the side of the collection tube, a gas meter is provided on the side of the purification box, a flow guide pipe is provided on the side of the gas meter, a concentration measuring device is provided on the side of the flow guide pipe, a main extraction pipeline is provided on the side of the flow guide pipe, a concentration measuring device is provided on the main extraction pipeline, and an automatic metering device, a negative pressure gauge, and an orifice plate are provided on the main extraction pipeline.

[0015] Preferably, a method for underground gas extraction and filtration in coal mines comprises the following steps:

[0016] S1, the staff placed the collection cylinder and the first bottom shell at an angle and connected them to the extraction pipeline, and started the external air pump to make the inside of the collection cylinder a negative pressure state. The negative pressure was used to extract the gas in the coal seam of the working face through the air inlet.

[0017] S2, the moisture in the humid gas in the collection tube 1 condenses into water droplets and drips downwards. After dripping downwards, the water enters the interior of the first bottom shell through the water outlet and comes into contact with the water absorption belt and is absorbed by the water absorption belt. The water absorption belt is rotated by the motor.

[0018] S3, the spring (15) pushes the squeezing wheel (10) upward through the elastic recovery action, and the squeezing wheel (10) and the fixed wheel (8) squeeze the water-absorbing belt (7) through their mutual cooperation, so that the liquid absorbed inside the water-absorbing belt (7) is squeezed out.

[0019] S4, the water inside the collection box is pumped by the micro water pump and transferred to the inside of the leak-proof block, so that the inside of the leak-proof block is filled with liquid. When the liquid inside the leak-proof block (20) is about to overflow through the air outlet (22), the micro water pump (23) stops running.

[0020] S5, the gas in the collection tube (1) is transported to the impurity removal box (29) by the ventilation pipe (19). The filter screen (32) in the impurity removal box (29) is used to filter the humid gas with impurities and remove moisture. The moisture in the humid gas gathers into droplets on the surface and inside of the filter screen (32) and flows into the bottom of the impurity removal box (29) for storage. As the liquid level inside the impurity removal box (29) gradually rises, the buoyancy of the float (33) gradually drives the filter screen (32) to move upward, replacing the filter screen (32) with impurities attached above the partition (31), and continuing to filter the humid gas.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention utilizes an external air pump to create a negative pressure inside the collection cylinder, allowing gas to be extracted from the coal seam through the air inlet. Moist gas condenses into water droplets inside the collection cylinder, dripping downwards and entering the first bottom shell through the outlet. There, it comes into contact with and is absorbed by the water-absorbing belt, which is then rotated by a motor. Furthermore, the invention uses a spring to push an upward-moving extrusion wheel, which, in conjunction with a fixed wheel, squeezes the water-absorbing belt, expelling the absorbed liquid. Compared to traditional devices, this invention effectively absorbs the condensed water droplets, preventing their accumulation inside the collection cylinder. The combination of the fixed and extrusion wheels allows for timely discharge of the absorbed liquid from the water-absorbing belt. This cyclical operation effectively prevents blockage of the air inlet 25, improving gas extraction efficiency.

[0023] 2. This invention uses a miniature water pump to extract water from the collection box, and then pumps the collected condensate into the box, conveying it through a water pipe to the inside of the leak-proof block, filling the block with liquid. Compared to traditional devices, this invention reuses the condensate collected in the collection box, using it to create a water seal between the leak-proof block and the collection cylinder, thus preventing gas from leaking out through the gap at the connection. Furthermore, in extreme cases, if gas does leak out through the gap, bubbles will form at the water seal, allowing workers to detect the leak promptly and ensure their safety.

[0024] 3. This invention delivers moist gas with impurities into the impurity removal chamber through a vent pipe. A filter screen removes impurities and moisture from the gas. The condensed moisture flows downwards through the gap between the partition and the filter screen to the bottom of the chamber for storage. As the liquid level rises, the float, under buoyancy, drives the filter screen upwards, causing the lower part of the filter screen (without impurities) to gradually rise, preventing blockage and reduced filtration efficiency. Compared to traditional devices, this invention utilizes the liquid collected during the secondary moisture removal process of the moist gas. This liquid, in conjunction with the float, uses buoyancy to drive the unused filter screen below the partition upwards, replacing the impurity-laden screen above the partition and continuing filtration of the moist gas. This effectively improves the filtration efficiency and quality of the filter screen for moist gas. Attached Figure Description

[0025] Figure 1 This is a system composition diagram of the present invention;

[0026] Figure 2This is a schematic diagram of the collection cylinder structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of the collection tube of the present invention;

[0028] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the local structure at point A;

[0029] Figure 5 This is a schematic diagram of the internal structure of the first bottom shell of the present invention;

[0030] Figure 6 This is a schematic diagram of the internal structure of the second bottom shell of the present invention;

[0031] Figure 7 For the present invention Figure 6 A magnified view of the structure at point B in the middle;

[0032] Figure 8 This is a schematic diagram of the water-absorbing tape of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of the filter screen of the present invention.

[0034] In the diagram: 1. Collection tube; 2. First bottom shell; 3. Second bottom shell; 4. First conveyor wheel; 5. Second conveyor wheel; 6. Third conveyor wheel; 7. Absorption belt; 8. Fixed wheel; 9. Fixed block; 10. Squeezing wheel; 11. Motor; 12. Groove; 13. Slider; 14. First vertical rod; 15. Spring; 16. Collection box; 17. Drying mechanism; 18. Water outlet; 19. Vent pipe; 20. Leak-proof block; 21. Sealing ring; 2. Air outlet; 23. Miniature water pump; 24. Water pipe; 25. Air inlet; 26. Second vertical rod; 27. Arc block; 28. Diversion block; 29. ​​Impurity removal box; 30. Top block; 31. Partition plate; 32. Filter screen; 33. Float block; 34. Main extraction pipeline; 35. Automatic metering device; 36. Negative pressure gauge; 37. Orifice plate; 38. Concentration measuring device; 39. Guide pipe; 40. Gas meter; 41. Limiting groove; 42. Limiting block. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1 to 9As shown, this embodiment of the invention provides a coal mine underground gas extraction and filtration device, including a collection cylinder 1. A first bottom shell 2 and a second bottom shell 3 are fixedly installed at the bottom end of the collection cylinder 1. An air inlet 25 is provided on the surface of the collection cylinder 1. A first transmission wheel 4, a second transmission wheel 5, and a third transmission wheel 6 located inside the first bottom shell 2 are rotatably installed inside the second bottom shell 3. The first transmission wheel 4, the second transmission wheel 5, and the third transmission wheel 6 are connected by a water-absorbing belt 7. A fixed wheel 8 located inside the water-absorbing belt 7 is rotatably installed inside the second bottom shell 3. A fixing block 9 is fixedly installed inside the second bottom shell 3. The fixed block 9 has a rotating squeezing wheel 10 located below the water absorption belt 7. The fixed block 9 has a groove 12 inside. The groove 12 has a sliding block 13 that is rotatably connected to the squeezing wheel 10. The groove 12 has a first vertical rod 14 that passes through the sliding block 13. The outer surface of the first vertical rod 14 is elastically connected to a spring 15 located at the bottom of the sliding block 13. The front of the second bottom shell 3 has a motor 11 whose output shaft is connected to the first transmission wheel 4. The collection tube 1 and the first bottom shell 2 have a water outlet 18. The second bottom shell 3 has a liquid collection box 16 fixedly installed inside.

[0037] Workers tilted the collection cylinder 1 and the first bottom shell 2 (the height of the collection cylinder 1 on the side of the third conveyor wheel 6 was lower than the height of the collection cylinder 1 on the side of the second bottom shell 3) and connected them to the extraction pipeline. They then started the external air pump to evacuate the inside of the collection cylinder 1, creating a negative pressure state. This negative pressure was used to draw in coal mine gas through the air inlet 25. The gas, carrying moisture, entered the collection cylinder 1, condensed into water droplets, and dripped downwards. The water then entered the first bottom shell 2 through the outlet 18. When the absorbent belt 7 comes into contact with and is absorbed by the liquid, the motor 11 is started, which drives the first transmission wheel 4 to rotate, thereby driving the absorbent belt 7 to rotate. When the absorbent belt 7, which has absorbed liquid, moves to the position between the fixed wheel 8 and the squeezing wheel 10, the spring 15 pushes the squeezing wheel 10 upward under the action of elasticity. The interaction between the squeezing wheel 10 and the fixed wheel 8 squeezes the absorbent belt 7, forcing the liquid absorbed inside the absorbent belt 7 to be squeezed out. Finally, under the action of gravity, it drips into the liquid collection box 16 for collection. Compared with traditional devices, this invention can use the absorbent belt 7 to absorb the condensed water droplets in time, avoiding the accumulation of water droplets inside the collection cylinder 1. The interaction between the fixed wheel 8 and the squeezing wheel 10 can also promptly discharge the liquid absorbed inside the absorbent belt 7. This cyclical operation can effectively prevent the air inlet 25 from being blocked, thus improving the gas extraction efficiency.

[0038] In this invention, a vent pipe 19 is inserted inside the collection tube 1. One end of the vent pipe 19 passes through the rear end of the collection tube 1. A leak-proof block 20 is fixedly sleeved on the outer surface of the vent pipe 19. The leak-proof block 20 passes through the inner and outer sides of the collection tube 1. A micro water pump 23 is fixedly installed inside the second bottom shell 3. The liquid inlet end of the micro water pump 23 is connected to the inside of the liquid collection box 16. The liquid outlet end of the micro water pump 23 is connected to the leak-proof block 20 through a water pipe 24. An air outlet 22 is opened on the top of the leak-proof block 20.

[0039] During operation, the operator starts the micro water pump 23. As the micro water pump 23 runs, water inside the collection box 16 is drawn into the leak-proof block 20 through the micro water pump 23 and water pipe 24, filling the leak-proof block 20 with liquid. The micro water pump 23 stops running when the liquid inside the leak-proof block 20 is about to overflow through the vent 22. Compared with traditional devices, this invention reuses the condensate collected in the collection box 16. The condensate forms a water seal between the leak-proof block 20 and the collection cylinder 1, preventing gas from leaking out through the gap between the leak-proof block 20 and the collection cylinder 1. Furthermore, in extreme cases, if gas does leak out through the gap between the leak-proof block 20 and the collection cylinder 1, bubbles will form at the gap in the water seal, allowing operators to detect gas leaks promptly and ensuring their safety.

[0040] In this embodiment, the outer end of the vent pipe 19 is fixedly connected to the impurity removal box 29, the interior of the impurity removal box 29 is fixedly installed with a partition 31, the top of the inner cavity of the impurity removal box 29 is fixedly installed with a top block 30, the interior of the impurity removal box 29 is movably installed with a filter screen 32, the bottom end of the filter screen 32 penetrates the partition 31 downwards, and the bottom end of the filter screen 32 is fixedly installed with a float block 33.

[0041] Moist gas containing impurities is conveyed into the impurity removal box 29 through the vent pipe 19. When it passes through the filter screen 32, the impurities attached to the moist gas are filtered and isolated on the outer side of the filter screen 32 due to the filtering effect of the filter screen 32. At the same time, the moisture in the moist gas will also accumulate into droplets on the surface and inside of the filter screen 32. The droplets will flow downwards through the gap between the partition 31 and the filter screen 32 to the bottom of the impurity removal box 29 for storage. As the liquid level inside the impurity removal box 29 gradually rises, the float 33 will drive the filter screen 32 to move upwards under the action of buoyancy, so that the lower part of the filter screen 32 without impurities will gradually rise, so as to prevent the filter screen 32 from being blocked by impurities and thus reducing the filtration effect of impurities and moisture. Compared with traditional devices, this invention utilizes the liquid collected during the secondary moisture removal of humid gas. Through cooperation with the float 33, the buoyancy drives the unused filter screen 32 located below the partition 31 to gradually move upward, thereby replacing the filter screen 32 above the partition 31 that has been covered with impurities. This allows for continued filtration of the humid gas, effectively improving the filtration efficiency and quality of the filter screen 32 for humid gas.

[0042] In this invention, although the gas contains a large amount of water, the water droplets condensing on and inside the filter screen 32 accumulate slowly during the secondary water removal process. Therefore, a certain volume of liquid can be pre-stored in the impurity removal tank 29. When the float 33 floats on the initial liquid surface, the upper side of the filter screen 32 contacts the adjacent side of the top block 30. As the condensed water droplets continuously enter the impurity removal tank 29, the liquid level inside the tank will rise, which will then quickly push the filter screen 32 upward, thereby replacing the filter screen that may have been blocked above.

[0043] The top block 30 has a limiting groove 41 on both sides. A limiting block 42 is slidably installed inside the limiting groove 41. The limiting block 42 is fixedly connected to the upper end of the filter screen 32. Due to the design of the limiting groove 41, the filter screen 32 can play a good limiting role, making the filter screen 32 move upward more smoothly and facilitating the filtration of humid gas.

[0044] The collection tube 1 has a flow guide block 28 and an arc block 27 fixedly installed inside. The top of the inner cavity of the collection tube 1 has a second vertical rod 26 fixedly installed. Due to the design of the second vertical rod 26, the arc block 27 and the flow guide block 28, the second vertical rod 26 increases the contact area with the humid gas, thereby increasing the accumulation speed of moisture in the humid gas. The arc block 27 and the flow guide block 28 guide the droplets, making the liquid flow downward more smoothly and avoiding contact with the air inlet 25 and causing blockage.

[0045] A sealing ring 21 is provided at the connection between the leak-proof block 20 and the collection tube 1. The sealing ring 21 is circular. Due to the design of the sealing ring 21, it can achieve a good sealing effect between the leak-proof block 20 and the collection tube 1, and prevent gas from leaking out.

[0046] The second bottom shell 3 is equipped with a drying mechanism 17 inside. The drying mechanism 17 is in contact with the outer surface of the water-absorbing belt 7. Due to the design of the drying mechanism 17, when the drying mechanism 17 is activated, the position where the drying mechanism 17 is in contact with the water-absorbing belt 7 is dried, thereby drying the water-absorbing belt 7 that has been squeezed, so that it can continue to absorb water droplets in the future.

[0047] The sampling cylinder 1 is equipped with a cleaning box 29, a gas meter 40, a flow guide pipe 39, a concentration measuring device 38, a main extraction pipeline 34, an automatic metering device 35, a negative pressure gauge 36, and an orifice plate 37. The gas meter 40 is equipped with a gas meter 40, a flow guide pipe 39, a concentration measuring device 38, an automatic metering device 35, a negative pressure gauge 36, and an orifice plate 37.

[0048] One method for underground gas extraction and filtration in coal mines includes the following specific steps:

[0049] S1, the staff placed the collection cylinder 1 and the first bottom shell 2 at an angle and connected them to the extraction pipeline, and started the external air pump to make the inside of the collection cylinder 1 under negative pressure. The negative pressure was used to extract the gas in the coal seam of the working face through the air inlet 25.

[0050] S2, the moisture in the humid gas in the collection tube 1 condenses into water droplets and drips downwards. It enters the interior of the first bottom shell 2 through the water outlet 18 and comes into contact with the water absorption belt 7 and is absorbed by the water absorption belt 7. The water absorption belt 7 is driven to rotate by the motor 11.

[0051] S3, the spring 15 pushes the extrusion wheel 10 upward through its elasticity, and the extrusion wheel 10 and the fixed wheel 8 work together to squeeze the absorbent belt 7, so that the liquid absorbed inside the absorbent belt 7 is squeezed out.

[0052] S4, the micro water pump 23 draws water from the liquid collection box 16 and transfers it to the inside of the leak-proof block 20, so that the inside of the leak-proof block 20 is filled with liquid. The micro water pump 23 stops running when the liquid inside the leak-proof block 20 is about to overflow through the air outlet 22.

[0053] S5, the gas in the collection tube 1 is transported to the impurity removal box 29 through the ventilation pipe 19. The filter screen 32 in the impurity removal box 29 is used to filter the humid gas with impurities and remove moisture. The moisture in the humid gas gathers into droplets on the surface and inside of the filter screen 32 and flows into the bottom of the impurity removal box 29 for storage. As the liquid level inside the impurity removal box 29 gradually rises, the buoyancy of the float 33 gradually drives the filter screen 32 to move upward, replacing the filter screen 32 with impurities attached above the partition 31, and continuing to filter the humid gas.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal mine underground gas extraction and filtration device, comprising a collection cylinder (1), characterized in that: The bottom end of the collection tube (1) is fixedly installed with a first bottom shell (2) and a second bottom shell (3). An air inlet (25) is opened on the surface of the collection tube (1). The second bottom shell (3) is rotatably installed with a first transmission wheel (4), a second transmission wheel (5) and a third transmission wheel (6) located inside the first bottom shell (2). The first transmission wheel (4), the second transmission wheel (5) and the third transmission wheel (6) are connected by a water absorption belt (7). The second bottom shell (3) is rotatably installed with a fixed wheel (8) located inside the water absorption belt (7). The second bottom shell (3) is fixedly installed with a fixed block (9). The fixed block (9) is rotatably installed with a fixed wheel located inside the water absorption belt (7). The squeezing wheel (10) below the fixed block (9) has a groove (12) inside. A slider (13) that is rotatably connected to the squeezing wheel (10) is slidably installed inside the groove (12). A first vertical rod (14) that passes through the slider (13) is fixedly installed inside the groove (12). A spring (15) located at the bottom end of the slider (13) is elastically connected to the outer surface of the first vertical rod (14). A motor (11) whose output shaft is connected to the first transmission wheel (4) is fixedly installed on the front of the second bottom shell (3). A water outlet (18) is opened between the collection tube (1) and the first bottom shell (2). A liquid collection box (16) is fixedly installed inside the second bottom shell (3).

2. The underground gas extraction and filtration device for coal mines according to claim 1, characterized in that: A vent tube (19) is inserted inside the collection tube (1). One end of the vent tube (19) passes through the collection tube (1). A leak-proof block (20) is fixedly fitted on the outer surface of the vent tube (19). The leak-proof block (20) passes through the inner and outer sides of the collection tube (1). A micro water pump (23) is fixedly installed inside the second bottom shell (3). One end of the micro water pump (23) is connected to the inside of the liquid collection box (16). The other end of the micro water pump (23) is connected to the leak-proof block (20) through a water pipe (24). An air outlet (22) is opened on the top of the leak-proof block (20).

3. The underground gas extraction and filtration device for coal mines according to claim 2, characterized in that: The outer end of the vent pipe (19) is fixedly connected to a cleaning box (29). A partition (31) is fixedly installed inside the cleaning box (29). A top block (30) is fixedly installed at the top of the inner cavity of the cleaning box (29). A filter screen (32) is movably installed inside the cleaning box (29). The bottom end of the filter screen (32) penetrates the partition (31) downwards. A float (33) is fixedly installed at the bottom end of the filter screen (32).

4. The underground gas extraction and filtration device for coal mines according to claim 3, characterized in that: Limiting grooves (41) are provided on both sides of the top block (30), and limiting blocks (42) are slidably installed inside the limiting grooves (41). The limiting blocks (42) are fixedly connected to the filter screen (32).

5. A coal mine underground gas extraction and filtration device according to claim 1, characterized in that: A drainage block (28) is fixedly installed inside the collection tube (1), an arc block (27) is fixedly installed inside the collection tube (1), and a second vertical rod (26) is fixedly installed at the top of the inner cavity of the collection tube (1).

6. A coal mine underground gas extraction and filtration device according to claim 2, characterized in that: A sealing ring (21) is provided at the connection between the leak-proof block (20) and the collection tube (1), and the sealing ring (21) is in the shape of a ring.

7. The underground gas extraction and filtration device for coal mines according to claim 1, characterized in that: The second bottom shell (3) is provided with a drying mechanism (17) inside, and the drying mechanism (17) is in contact with the outer surface of the water-absorbing belt (7).

8. A coal mine underground gas extraction and filtration device according to claim 1, characterized in that: A cleaning box (29) is provided on the side of the collection tube (1). A gas meter (40) is provided on the side of the cleaning box (29). A guide pipe (39) is provided on the side of the gas meter (40). A concentration measuring device (38) is provided on the side of the guide pipe (39). A main extraction pipeline (34) is provided on the side of the guide pipe (39). A concentration measuring device (38) is provided on the main extraction pipeline (34). An automatic metering device (35), a negative pressure gauge (36), and an orifice plate (37) are provided on the main extraction pipeline (34).

9. The method of using a coal mine underground gas extraction and filtration device according to any one of claims 1-8, characterized in that: The steps are as follows: S1, the staff tilted the collection tube (1) and the first bottom shell (2) and connected them to the extraction pipeline, and started the external air extraction. The pump creates a negative pressure inside the collection cylinder (1), and uses this negative pressure to draw gas from the coal seam in the working face through the air inlet (25). Si; S2, the moisture in the humid gas in the collection tube (1) condenses into water droplets and drips downwards. It enters the interior of the first bottom shell (2) through the water outlet (18) and comes into contact with the water absorption belt (7) and is absorbed by the water absorption belt (7). The water absorption belt (7) is driven to rotate by the motor (11). S3, the spring (15) pushes the squeezing wheel (10) upward through the elastic recovery action, and the squeezing wheel (10) and the fixed wheel (8) squeeze the water-absorbing belt (7) through their mutual cooperation, so that the liquid absorbed inside the water-absorbing belt (7) is squeezed out. S4, the water inside the liquid collection box (16) is drawn by the micro water pump (23) and transferred to the inside of the leak-proof block (20), so that the inside of the leak-proof block (20) is filled with liquid. The micro water pump (23) stops running when the liquid inside the leak-proof block (20) is about to overflow through the air outlet (22). S5, the gas in the collection tube (1) is transported to the impurity removal box (29) through the ventilation pipe (19). The filter screen (32) in the impurity removal box (29) is used to filter the humid gas with impurities and remove moisture. The moisture in the humid gas gathers into droplets on the surface and inside of the filter screen (32) and flows into the bottom of the impurity removal box (29) for storage. (29) The internal liquid level gradually rises, and the buoyancy of the float (33) gradually drives the filter screen (32) to move upward as a whole, replacing the partition. (31) The filter screen (32) with impurities attached to it continues to filter the humid gas.

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