Coal mine underground gas circulation pumping drainage system

Abstract

The invention belongs to the related technical field of coal mining, and particularly discloses a coal mine underground gas circulation pumping drainage system which comprises a first support and a second support, a pumping drainage tank is fixedly installed in the first support, a purification tank is fixedly installed above the second support, a multi-stage separation assembly is arranged in the pumping drainage tank, and the purification tank is fixedly installed above the second support. An air guide pipe is installed on the lower portion of the inner side of the pumping and discharging tank in a communicating mode, an exhaust fan is fixedly installed on the upper portion of the inner side of the pumping and discharging tank, a frame box is fixedly installed in the purification tank, the interior of the exhaust fan communicates with the frame box through a conveying pipe installed in a communicating mode, a filter box is fixedly installed on the inner side of the frame box, and an adsorption assembly is arranged in the filter box. A flow extending tank is fixedly installed on the lower portion of the inner side of the filter box, an air inlet is formed in the upper surface of the flow extending tank, a flow extending assembly is arranged in the flow extending tank, and a magnetic attraction assembly is arranged on the outer side of the flow extending tank.

Description

Technical Field

[0001] The invention belongs to the technical field related to coal mining, and specifically discloses a coal mine underground gas circulation extraction system. Background Art

[0002] Coal mining requires opening a mine underground. When mining coal in a mine, gas will enter the mine through the coal layer. The gas contains carbon monoxide, which is toxic and can easily threaten the lives of miners. In addition, methane in the gas is prone to combustion and explosion when the concentration reaches a certain level, causing mining accidents. Therefore, during the coal mining process, the gas in the mine needs to be pumped out to avoid the increase of internal gas concentration. When gas is extracted, since the gas contains dust and moisture, the processing steps for later use are more complicated. The dust and moisture cannot be processed during the extraction process, and the gas utilization rate is low. Therefore, we need to make improvements. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the background technology and to propose a coal mine underground gas circulation extraction system.

[0004] To achieve the above objectives, the present invention discloses a coal mine underground gas circulation extraction system, comprising a first bracket and a second bracket, wherein an extraction tank is fixedly installed inside the first bracket, a purification tank is fixedly installed above the second bracket, a multi-stage separation component is arranged inside the extraction tank, an air duct is connected and installed at the lower inner side of the extraction tank, an exhaust fan is fixedly installed at the upper inner side of the extraction tank, a frame box is fixedly installed inside the purification tank, the exhaust fan is connected to the frame box through a connected and installed conveying pipe, a filter box is fixedly installed inside the frame box, an adsorption component is arranged inside the filter box, an extension pot is fixedly installed at the lower inner side of the filter box, an air inlet is opened on the upper surface of the extension pot, an extension pot is arranged inside the extension pot, a magnetic suction component is arranged outside the extension pot, an air intake component is arranged inside the extension pot, a box door is rotatably installed at the front end of the frame box, a sealing door is rotatably and sealably installed at the upper front end of the purification tank, and an exhaust pipe is connected and installed inside the purification tank and close to the extension pot.

[0005] Preferably, the multi-stage separation component includes a plurality of filter screens, an inlet pipe is installed and connected at the lower inner side of the pumping tank, a cone tank is installed and connected above the inlet pipe, an air supply pipe is horizontally inserted above the inner side of the cone tank, and a hard pipe is installed and connected vertically at the lower inner side of the air supply pipe. The plurality of filter screens are rotated and sleeved on the outside of the hard pipe in a sequence of decreasing diameters from top to bottom, guide plates are installed on the outer edges of the plurality of filter screens at equal distances along the circumferential direction, and a plurality of groups of air nozzles are installed and connected inside the hard pipe and above each filter screen, and the plurality of groups of air nozzles are arranged at equal distances along the circumferential direction.

[0006] Preferably, a cleaning assembly is provided between two adjacent filter screens, and the cleaning assembly includes a cleaning brush provided between the two adjacent filter screens, a connecting rod is inserted inside the cleaning brush, one end of the connecting rod away from the filter screen passes through the outside of the cone tank, and a rotating wheel is provided outside the connecting rod and below the guide plate, and the rotating wheel is in active contact with the guide plate.

[0007] Preferably, a rotating wheel is fixedly mounted on the outside of the ends of the multiple connecting rods away from the conical tank, and a belt is commonly mounted on the outside of the multiple rotating wheels. An inclined rod is fixedly mounted on the inner surface of the drainage tank and on the side close to the conical tank. One end of the multiple connecting rods is rotatably inserted into the inclined rod, and a rotating shaft is rotatably mounted at the lower inner side of the inclined rod. One end of the rotating shaft is connected to the connecting rod near the top of the inlet pipe, and the end of the rotating shaft away from the inclined rod is connected to a first motor, which is fixedly mounted on the outside of the drainage tank. The lengths of the multiple connecting rods decrease from top to bottom, the length of the cleaning brush corresponding to the outside of the filter corresponds to the radius of the corresponding filter, and the end of the guide piece corresponding to the outside of the filter increases from top to bottom along the inner contour of the conical tank.

[0008] Preferably, the adsorption assembly includes adsorption drawers symmetrically and movably inserted into the filter box, and pull rods are fixedly installed on both sides of the front ends of the two adsorption drawers.

[0009] Preferably, the air intake assembly includes a conduit connected to one end installed inside the extension tank, the end of the conduit away from the extension tank is connected to a connecting pipe installed, the end of the connecting pipe away from the conduit is connected to a circulating heat pump installed, and the circulating heat pump is fixedly connected to the outside of the purification tank through an external fixed bracket.

[0010] Preferably, the flow extension assembly includes multiple transverse plates fixedly installed on the inner side of the flow extension tank, the multiple transverse plates are tangent to the inner surface of the flow extension tank from top to bottom, the multiple transverse plates are cross-connected and equipped with flow pipes, the multiple transverse plates are slidably installed with magnetic frames on the outer surfaces, and the areas of the magnetic frames on the outer surfaces of the multiple transverse plates gradually decrease toward the upper and lower ends with the middle transverse plate as the center, multiple groups of outer edges of the magnetic frames are slidably fitted with the inner surface of the flow extension tank, metal rings are slidably installed on the outside of the flow extension tank, the metal rings are magnetically connected to the multiple groups of magnetic frames, a butt seat is fixedly connected to the lower outer side of the metal ring, mounting blocks are fixedly connected to both sides of the bottom of the frame box, a screw rod is threadedly inserted between the two mounting blocks, one end of the screw rod is connected to a second motor, and the second motor is fixedly installed at the lower outer side of the purification tank.

[0011] Preferably, an air pump is installed at one end of the air supply pipe away from the cone tank, and the bottom of the air pump is fixedly installed on the exhaust tank through a fixedly connected support and is located above the outside of the air duct, and a liquid discharge pipe is installed on the inside of the purification tank and located above the second bracket.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By arranging a multi-stage separation component inside the cone tank, the incoming gas can be filtered and separated in sequence until the gas passes through the topmost filter, and then all the incoming gas is fully processed. Under the connection of the guide plates on the outside of multiple filters, the flow rate of the gas can be reduced when the gas enters, and each filter can be utilized to the maximum extent. The cleaning brushes under the multiple filters can, under the transmission cooperation of the connecting rod, the rotating wheel, and the belt, prompt each connecting rod and the cleaning brush to clean the filtered material on the lower surface of the filter. The rotation of the connecting rod will prompt the rotating wheel to drive the guide plates on the outside of the corresponding filter to contact, and then under the connection of multiple sets of guide plates, each filter is prompted to self-rotate, so that the cleaning brush can contact the lower surface of each filter when rolling and cleaning.

[0013] After the dust is removed, the gas after dust removal can be sent to the upper surface of the filter box inside the frame box through the exhaust fan and the conveying pipe. The adsorption drawer inside the filter box can adsorb the moisture of the sent gas. In the process of gradually conveying the gas, the exhaust pipe is connected to the external suction equipment. The gas can be drained by the exhaust pipe. The gas inside the extension tank is sucked. In this way, the airflow will be drained from top to bottom under the action of suction. The gas inside the extension tank will gradually pass through the flow pipes staggered in multiple horizontal plates when entering, extending the flow distance. In this way, it can be integrated with the dry gas transported in the heat pump. The two can blend with each other during the flow process, and then the gas containing moisture is processed. Therefore, in the process of extraction, all the moisture and dust mixed in the introduced gas are processed.

[0014] By arranging magnetic frames of different areas inside the extension tank and above the cross plate, the water droplets that may be generated on the surface of the cross plate can be pushed away by the reciprocating movement of the magnetic frame under the drive of the second motor and the screw rod. In the process of moving back and forth, the water droplets can also be sent to the bottom of the purification tank through the connecting pipe and then flow away through the drainage pipe of the purification tank. At the same time, when there are not many water droplets, the contact range of the water droplets and the cross plate is increased by allowing the magnetic frame to contact the water droplets under the contact with the warm gas, and then the evaporation rate of the water droplets is increased through the heat transfer of the cross plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another angle of the present invention; Figure 3 This is a schematic diagram of the connection structure of the inner part of the pumping tank of the present invention; Figure 4 This is a schematic diagram of the connection structure of the inner part of the purification tank of the present invention; Figure 5 It is a schematic diagram of the split connection structure between the adsorption component and the filter box of the present invention; Figure 6 This is a schematic diagram of the overall connection structure of the filter box of the present invention; Figure 7 This is a schematic diagram of the connection structure of the inner part of the extension tank of the present invention; Figure 8 A schematic diagram of the connection structure between one set of filter screens and a cleaning brush of the present invention; Fig. 9 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0016] In the figure: 1, first bracket; 2, second bracket; 3, exhaust tank; 4, purification tank; 5, first motor; 6, air pump; 7, exhaust fan; 8, delivery pipe; 9, sealing door; 10, second motor; 11, bracket; 12, circulating heat pump; 13, connecting pipe; 14, support; 15, air duct; 16, air delivery pipe; 17, rotor; 18, inclined rod; 19, rotating shaft; 20, connecting rod; 21, introduction pipe; 2 2. Screw rod; 23. Filter box; 24. Flow tank; 25. Exhaust pipe; 26. Frame box; 27. Mounting block; 28. Seat; 29. ​​Cone; 30. Pull rod; 31. Adsorption drawer; 32. Metal ring; 33. Flow pipe; 34. Magnetic frame; 35. Horizontal plate; 36. Filter screen; 37. Rotating wheel; 38. Cleaning brush; 39. Guide plate; 40. Hard pipe; 41. Air nozzle; 42. Cone tank; 43. Belt. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] like Figure 1-Figure 9 The coal mine underground gas circulation extraction system shown in the figure includes a first bracket 1 and a second bracket 2, a drainage tank 3 is fixedly installed inside the first bracket 1, a purification tank 4 is fixedly installed above the second bracket 2, a multi-stage separation component is arranged inside the drainage tank 3, an air duct 15 is connected and installed at the lower part of the inner side of the drainage tank 3, an exhaust fan 7 is fixedly installed at the upper part of the inner side of the drainage tank 3, a frame box 26 is fixedly installed inside the purification tank 4, the exhaust fan 7 is connected to the frame box 26 through a conveying pipe 8 installed in a connecting manner, a filter box 23 is fixedly installed inside the frame box 26, and each layer of the filter box 23 is provided with a gas groove for facilitating the flow of gas An adsorption component is arranged inside the filter box 23, a flow extension pot 24 is fixedly installed at the lower inner side of the filter box 23, an air inlet is opened on the upper surface of the flow extension pot 24, a flow extension component is arranged inside the flow extension pot 24, a magnetic suction component is arranged on the outer side of the flow extension pot 24, an air intake component is arranged inside the flow extension pot 24, a box door is rotatably installed at the front end of the frame box 26, and the opening and closing between the box door and the frame box 26 is for the convenience of replacing the consumable materials of the adsorption component at a later stage, and the two are sealed and rotatably connected, a sealing door 9 is rotatably installed at the upper front end of the purification tank 4, and an exhaust pipe 25 is installed inside the purification tank 4 and is connected to the lower side close to the flow extension pot 24.

[0020] The multi-stage separation component includes a plurality of filters 36. The lower inner side of the extraction tank 3 is connected to the inlet pipe 21, and the upper part of the inlet pipe 21 is connected to the cone tank 42. The upper inner side of the cone tank 42 is horizontally interspersed with the air supply pipe 16, and the lower inner side of the air supply pipe 16 is vertically connected to the hard pipe 40. The plurality of filters 36 are rotated and sleeved on the outer side of the hard pipe 40 in the order of decreasing diameter from top to bottom. The plurality of filters 36 of different sizes are sequentially arranged on the outer side of the hard pipe 40, and can sequentially contact with the hard pipe 40 during the gas flow process, so as to fully filter the impure dust in the gas, and the filter 36 close to the top It fits with the inner wall of the cone tank 42, and after passing through multiple filters 36 arranged below in sequence, it finally passes through the top filter 36 so that all the gas is processed, and all the gas flows out from the inside of the exhaust tank 2. This method can fully process the gas dust, and the outer edges of multiple filters 36 are equipped with guide plates 39 at equal distances along the circumferential direction. Multiple groups of gas nozzles 41 are connected and installed inside the hard pipe 40 and above each filter 36. The multiple groups of gas nozzles 41 are arranged at equal distances along the circumferential direction. With the connection of the gas nozzles 41, the surface of the filter 36 can be cleaned after the shutdown in the later stage.

[0021] A cleaning assembly is provided between two adjacent filter screens 36, and the cleaning assembly includes a cleaning brush 38 provided between the two adjacent filter screens 36, a connecting rod 20 is inserted inside the cleaning brush 38, one end of the connecting rod 20 away from the filter screen 36 passes through the outside of the cone tank 42, and a rotating wheel 37 is provided outside the connecting rod 20 and below the guide piece 39, and the rotating wheel 37 is in active contact with the guide piece 39. The connecting rod 20 can drive the rotating wheel 37 and the cleaning brush 38 to rotate, and then the rotating wheel 37 is respectively in contact with the guide piece 39, so as to cause the corresponding filter screen 36 to rotate. This makes it convenient for the cleaning brush 38 to clean the upper and lower surfaces of the filter 36. When the filter 36 located at the bottom is in use, the cleaning brush 38 is in active contact with the surface between the two adjacent filter screens 36. Since the filter screens 36 are of different sizes, this means that when cleaning the lower surface of one group of filter screens 36, some dust will fall onto the upper surface of the lower filter screen 36. Therefore, such an arrangement is made so that each filter screen 36 can smoothly flow gas and ensure the separation effect. There is an exhaust fan 7 above the top filter screen 36 so that no dust falls, and there is no need to add an extra row of cleaning brushes 38.

[0022] A rotating wheel 17 is fixedly mounted on the outside of the multiple connecting rods 20 and the end away from the cone tank 42. A belt 43 is commonly mounted on the outside of the multiple rotating wheels 17. Driven by the belt 43 and the rotating wheel 17, the multiple connecting rods 20 can rotate at the same time. When processing gas, they can be used synchronously. An inclined rod 18 is fixedly mounted on the inner surface of the extraction tank 3 and close to the side of the cone tank 42. One end of the multiple connecting rods 20 is rotatably inserted into the inclined rod 18. A rotating shaft 19 is rotatably mounted on the lower inner side of the inclined rod 18. One end of the rotating shaft 19 is connected to the connecting rod 20 near the top of the inlet pipe 21. The end of the rotating shaft 19 away from the inclined rod 18 is connected to the first motor 5. The first motor 5 is fixedly installed on the outside of the extraction tank 3, the first motor 5 is connected to the corresponding connecting rod 20 below through the rotating shaft 19, and the multiple connecting rods 20 can rotate synchronously through the transmission of the belt 43. The lengths of the multiple connecting rods 20 decrease from top to bottom. The length of the cleaning brush 38 on the outside of the corresponding filter 36 corresponds to the radius of the corresponding filter 36. The end of the guide piece 39 on the outside of the corresponding filter 36 increases from top to bottom along the internal contour of the cone tank 42. In order to ensure that the multiple connecting rods 20 can rotate at the same time, different lengths of connecting rods 20 are used according to the internal space of the cone tank 42. Similarly, the cleaning brush 38 and the guide piece 39 are the same as described above. Only one end of the guide piece 39 on the outside of different filters 36 is extended toward the inner wall of the cone tank 42, so as to reduce the flow space on both sides of the filter 36 to ensure that the gas can fully contact with multiple filters 36, and further cooperate with the rotation of the rotating wheel 37 to drive the filter 36 to rotate.

[0023] The adsorption assembly includes adsorption drawers 31 that are symmetrically and movably inserted into the filter box 23. Pull rods 30 are fixedly installed on both sides of the front end of the two adsorption drawers 31. Dry adsorbent can be placed inside the adsorption drawers 31 to remove moisture from the passing gas. The pull rods 30 make it convenient to pull out the adsorption drawers 31 for replacement.

[0024] The air intake assembly includes a conduit 29 connected to one end installed inside the extension tank 24, and a connecting pipe 13 is installed on the end of the conduit 29 away from the extension tank 24, and a circulating heat pump 12 is installed on the end of the connecting pipe 13 away from the conduit 29. The circulating heat pump 12 is fixedly connected to the outside of the purification tank 4 through an external fixed bracket 11. Under the connection of the connecting pipe 13, the warm gas of the circulating heat pump 12 can be transported to the inside of the conduit 29, and finally enter the top of the extension tank 24 to mix with the gas. It should be specially noted that the circulating heat pump 12 can be provided with a temperature controller on the outside to adjust the temperature of the dry airflow to avoid overheating.

[0025] The flow extension assembly includes a plurality of transverse plates 35 fixedly installed on the inner side of the flow extension pot 24. The plurality of transverse plates 35 are tangent to the inner surface of the flow extension pot 24 from top to bottom. The plurality of transverse plates 35 are cross-connected and installed with flow pipes 33. The plurality of transverse plates 35 are tangent to the inner surface of the flow extension pot 24, and the internal flow pipes 33 are cross-arranged. The purpose is to extend the flow time of the dry airflow and the gas, so that the two can fully contact each other, so as to remove excess moisture in the gas. The outer surfaces of the plurality of transverse plates 35 are slidably installed with magnetic frames 34, and the area of ​​the magnetic frames 34 on the outer surfaces of the plurality of transverse plates 35 gradually decreases toward the upper and lower ends with the middle transverse plate 35 as the center. The magnetic frames 34 of different sizes are arranged inside the flow extension pot 24 according to the internal space of the two adjacent transverse plates 35, so as to push the excess water vapor back and forth, so that the water vapor can contact with the transverse plates. 35 is in full contact. Under the contact of the warm airflow and the cross plate 35, the water vapor can be quickly evaporated, and can also be discharged into the inner bottom of the purification tank 4 along the circulation pipe 33 during the reciprocating pushing process. The outer edges of the multiple groups of magnetic frames 34 are slidably fitted with the inner surface of the extended flow tank 24. The extended flow tank 24 is slidably installed with a metal ring 32 on the outside. The metal ring 32 is magnetically connected to the multiple groups of magnetic frames 34. The magnetic frame 34 can be driven by the metal ring 32. Under the threaded cooperation of the screw rod 22 and the stopper 28, the external metal ring 32 can drive the magnetic frame 34 to reciprocate. The stopper 28 is fixedly connected to the lower outer side of the metal ring 32. The bottom sides of the bottom of the frame box 26 are fixedly connected with mounting blocks 27. A screw rod 22 is threadedly inserted between the two mounting blocks 27. One end of the screw rod 22 is connected to the second motor 10, and the second motor 10 is fixedly installed at the lower outer side of the purification tank 4.

[0026] An air pump 6 is installed at one end of the air supply pipe 16 away from the conical tank 42. The bottom of the air pump 6 is fixedly installed on the exhaust tank 3 through a fixedly connected support 14 and is located above the outer side of the air duct 15. A drain pipe is installed on the inner side of the purification tank 3 and located above the second bracket 4. The air pump 6 can transport the gas used to clean the surface of the filter screen 36 in the later stage to the inside of the hard tube 40 through the air supply pipe 16.

[0027] Working principle: When in use, the air intake pipe 15 is connected to the drilled hole drilled in advance below the rock formation through an external suction pump, and the gas is sucked into the exhaust tank 3, and then introduced into the cone tank 42 through the introduction pipe 21. Under the suction of the exhaust fan 7, the gas is drained from bottom to top, and the gas can pass through multiple filter screens 36 in sequence. During the flow process, it contacts the filter screens 36 with increasing diameters, which can further remove the dust in the gas. In order to ensure the efficiency of filtering and separating dust by the filter screens 36, the first motor 5 can be driven to drive the corresponding connecting rod 20 to drive the cleaning brush 38 at the front end to rotate, and the upper and lower surfaces of each filter screen 36 are cleaned. The rotating wheel 37 on the outside of the connecting rod 20 is in active contact with the corresponding guide sheet 39, so that the corresponding filter screen 36 can be rotated on the outside of the hard pipe 40. The use length of the cleaning brush 38 corresponds to the radius of the filter screen 36 at the corresponding position. , thereby ensuring that the surface of each filter 36 can be cleaned, the gas after dust removal is sucked by the top exhaust fan 7 and the conveying pipe 8, and introduced into the purification tank 4, and the gas contacts the adsorption drawer 31 inside the filter box 23 during the flow process, and the adsorption drawer 31 will adsorb the moisture in the gas. In order to ensure that the gas can be fully pre-treated during the extraction process, the gas passes through the bottom of the filter box 23 and then enters the extension tank 24 through the air inlet. The gas is guided by the flow pipes 33 intersecting the inside of the multiple horizontal plates 35, and the time of the gas in the extension tank 24 is prolonged. The circulating heat pump 12 can send the dry and warm airflow into the extension tank 24 through the connecting pipe 13. The dry airflow fully contacts the gas during the flow process, and can take away the moisture in the gas. Under this circulating suction, the gas can be fully pre-treated and then stored for use.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A coal mine underground gas circulation extraction system, comprising a first bracket (1) and a second bracket (2), characterized in that: A suction tank (3) is fixedly mounted inside the first bracket (1), a purification tank (4) is fixedly mounted above the second bracket (2), a multi-stage separation assembly is arranged inside the suction tank (3), an air duct (15) is connectedly mounted at the lower inner side of the suction tank (3), an exhaust fan (7) is fixedly mounted at the upper inner side of the suction tank (3), a frame box (26) is fixedly mounted inside the purification tank (4), the exhaust fan (7) is connected to the frame box (26) via a conveying pipe (8) connected thereto, a filter box (23) is fixedly mounted inside the frame box (26), and the filter box (23) is fixedly mounted inside the frame box (26). An adsorption component is arranged inside the box (23), a flow extension pot (24) is fixedly installed at the lower inner side of the filter box (23), an air inlet is opened on the upper surface of the flow extension pot (24), a flow extension component is arranged inside the flow extension pot (24), a magnetic suction component is arranged outside the flow extension pot (24), an air inlet component is arranged inside the flow extension pot (24), a box door is rotatably installed at the front end of the frame box (26), a sealing door (9) is rotatably installed at the upper front end of the purification tank (4), and an exhaust pipe (25) is installed inside the purification tank (4) and close to the lower part of the flow extension pot (24) in communication.

2. A coal mine underground gas circulation extraction system according to claim 1, characterized in that: The multi-stage separation assembly comprises a plurality of filter screens (36); an inlet pipe (21) is installed and connected to the lower inner side of the pumping tank (3); a cone tank (42) is installed and connected to the upper inner side of the cone tank (42); an air supply pipe (16) is inserted transversely through the upper inner side of the cone tank (42); a hard pipe (40) is installed and connected to the lower inner side of the air supply pipe (16); the plurality of filter screens (36) are rotated and sleeved on the outer side of the hard pipe (40) in a decreasing order of diameter from top to bottom; guide plates (39) are installed on the outer edges of the plurality of filter screens (36) at equal distances in the circumferential direction; a plurality of groups of air nozzles (41) are installed and connected to the interior of the hard pipe (40) and located above each filter screen (36); the plurality of groups of air nozzles (41) are arranged at equal distances in the circumferential direction.

3. The underground coal mine gas circulation extraction system according to claim 2, characterized in that: A cleaning assembly is provided between two adjacent filter screens (36), and the cleaning assembly comprises a cleaning brush (38) provided between the two adjacent filter screens (36), a connecting rod (20) is inserted inside the cleaning brush (38), one end of the connecting rod (20) away from the filter screen (36) passes through the outside of the cone tank (42), and a rotating wheel (37) is provided outside the connecting rod (20) and below the guide plate (39), and the rotating wheel (37) is in movable contact with the guide plate (39).

4. The underground coal mine gas circulation extraction system according to claim 3, characterized in that: A rotating wheel (17) is fixedly mounted on the outside of the ends of the plurality of connecting rods (20) that are away from the cone tank (42), and a belt (43) is commonly mounted on the outside of the plurality of rotating wheels (17). An inclined rod (18) is fixedly mounted on the inner surface of the pumping tank (3) and on the side close to the cone tank (42). One end of the plurality of connecting rods (20) is rotatably inserted into the inclined rod (18), and a rotating shaft (19) is rotatably mounted on the lower inner side of the inclined rod (18). One end of the rotating shaft (19) is connected to a pipe near the inlet pipe (21). The connecting rod (20) at the top is connected, and one end of the rotating shaft (19) away from the inclined rod (18) is connected to the first motor (5), and the first motor (5) is fixedly installed on the outside of the extraction tank (3), and the lengths of the plurality of connecting rods (20) decrease from top to bottom, and the length of the cleaning brush (38) corresponding to the outside of the filter (36) corresponds to the radius of the corresponding filter (36), and the end of the guide piece (39) corresponding to the outside of the filter (36) increases from top to bottom along the inner contour of the cone tank (42).

5. The underground coal mine gas circulation extraction system according to claim 1, characterized in that: The adsorption assembly comprises adsorption drawers (31) symmetrically and movably inserted into the interior of the filter box (23), and pull rods (30) are fixedly mounted on both sides of the front ends of the two adsorption drawers (31).

6. A coal mine underground gas circulation extraction system according to claim 5, characterized in that: The air intake assembly comprises a conduit (29) which is connected to one end of the interior of the extension tank (24); the end of the conduit (29) which is away from the extension tank (24) is connected to a connecting pipe (13) which is installed thereon; the end of the connecting pipe (13) which is away from the conduit (29) is connected to a circulating heat pump (12) which is installed thereon; the circulating heat pump (12) is fixedly connected to the outside of the purification tank (4) via an externally fixed bracket (11).

7. The underground coal mine gas circulation extraction system according to claim 1, characterized in that: The flow extension assembly comprises a plurality of transverse plates (35) fixedly mounted on the inner side of the flow extension tank (24), the plurality of transverse plates (35) being tangent to the inner surface of the flow extension tank (24) from top to bottom, the plurality of transverse plates (35) being cross-connected with the flow pipes (33) being mounted therein, the plurality of transverse plates (35) being slidably mounted with magnetic frames (34) on the outer surfaces of the plurality of transverse plates (35), and the area of ​​the magnetic frames (34) on the outer surfaces of the plurality of transverse plates (35) gradually decreasing from the middle transverse plate (35) to the upper and lower ends, and the outer edges of the plurality of groups of magnetic frames (34) being in contact with the flow extension tank (24). 4), a metal ring (32) is slidably mounted on the outside of the extension tank (24), the metal ring (32) is magnetically connected to the plurality of magnetic frames (34), a stopper (28) is fixedly connected to the lower part of the outer side of the metal ring (32), mounting blocks (27) are fixedly connected to both sides of the bottom of the frame box (26), a screw rod (22) is threadedly inserted between the two mounting blocks (27), one end of the screw rod (22) is connected to a second motor (10), and the second motor (10) is fixedly mounted to the lower part of the outer side of the purification tank (4).

8. The underground coal mine gas circulation extraction system according to claim 2, characterized in that: An air pump (6) is installed in communication with one end of the air supply pipe (16) away from the cone tank (42); the bottom of the air pump (6) is fixedly installed on the extraction tank (3) via a fixedly connected support (14) and is located above the outer side of the air duct (15); and a liquid discharge pipe is installed in communication with the inner side of the purification tank (4) and located above the second bracket (2).

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