A gas extraction equipment for coal mines

Abstract

The present invention discloses coal mine gas drainage equipment, comprising a draft tube and a first outer tube fixedly mounted on the draft tube, an annular gap being defined between the inner wall of the first outer tube and the outer wall of the draft tube, the annular gap being sealed at both axial ends of the draft tube and filled with a gas adsorption material; and a first gas concentration monitoring device located within the annular gap. The present invention provides coal mine gas drainage equipment to address the problems of draft tubes being easily damaged and difficult to detect in the prior art. The equipment reduces the probability of damage to the gas drainage draft tube and facilitates detection of any damage.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to gas drainage equipment for coal mines. Background Art

[0002] Gas refers to the methane-based gas found in mines, primarily composed of coalbed methane, sometimes referred to as methane alone. It is colorless, tasteless, odorless, flammable or explosive, insoluble in water, and more diffusible than air. The "Coal Mine Safety Regulations" stipulate that if gas is found in even one coal (rock) layer within a mine, the mine is considered a gas mine. Gas mines must be managed according to the mine gas grade, and mine gas extraction equipment must be used underground to ensure that gas concentrations remain within safe limits. Gas extraction is not only an important measure to reduce gas outbursts during mining, prevent gas over-limit and accumulation, and prevent gas explosions and coal and gas outburst accidents, but it can also be used to develop and utilize coal-associated resources.

[0003] To extract gas, a hole is typically drilled deep into the coal seam, and a diversion pipe is inserted into the hole for extraction. However, existing diversion pipes are simple in structure and easily damaged by corrosion, formation stress, and coal seam collapse, which can affect extraction efficiency and pose safety risks. Furthermore, because the diversion pipe is located deep within the coal seam, even if corrosion, perforation, or extrusion damage occurs, it is difficult to detect, hindering timely replacement and maintenance. Summary of the Invention

[0004] The present invention provides a gas drainage device for coal mines to solve the problems in the prior art that the guide pipe is easily damaged and difficult to detect after being damaged, thereby achieving the purpose of reducing the probability of damage to the guide pipe for gas drainage and making it easier to detect after being damaged.

[0005] The present invention is achieved through the following technical solutions:

[0006] A gas extraction device for coal mines includes a guide pipe and a first outer pipe fixedly mounted outside the guide pipe, an annular gap is defined between the inner wall of the first outer pipe and the outer wall of the guide pipe, the annular gap is sealed at both axial ends of the guide pipe, and the annular gap is filled with a gas adsorption material; and a first gas concentration monitoring device is also provided in the annular gap.

[0007] In response to the problems in the prior art that the guide pipe is easily damaged and difficult to detect after being damaged, the present invention proposes a gas extraction equipment for coal mines. In this equipment, a first outer pipe is fixedly mounted outside the guide pipe, so that the inner diameter of the first outer pipe is larger than the outer diameter of the guide pipe, thereby obtaining an annular gap; the present application performs sealing treatment on both axial ends of the annular gap, and fills the annular gap with gas adsorption material, and at the same time monitors the gas concentration in the annular gap in real time through a first gas concentration monitoring device.

[0008] The present application protects the guide pipe through the first outer tube, reduces the risk of the guide pipe being directly corroded and eroded by the formation fluid, and at the same time avoids the forces generated by the release of ground stress and coal seam collapse from directly acting on the guide pipe. The first outer tube bears these forces to reduce the risk of physical damage to the guide pipe. In addition, when the guide pipe or the first outer tube is damaged, the gas enters the annular gap and is adsorbed by the gas adsorption material, thereby reducing the gas concentration in the air and reducing the risk of explosion. When the first outer tube is squeezed and deformed by the formation, the gas adsorption material filled inside can also play a buffering role. The energy absorption effect is achieved through the mutual friction and extrusion of the gas adsorption material, which can effectively reduce the impact load of coal seam collapse on the guide pipe and significantly improve the physical protection effect of the guide pipe. The gas adsorption material in this solution can be implemented using any existing material that can adsorb gas, such as activated carbon, graphene composite materials, etc.

[0009] The present application also monitors the gas concentration in the annular gap in real time through the first gas concentration monitoring device. Therefore, when the guide tube or the first outer tube is damaged and the gas adsorption material reaches the adsorption limit, the first gas concentration monitoring device will detect a significant increase in the gas concentration. At this time, the staff can be prompted to repair or replace the equipment to further ensure the safety of underground operations.

[0010] Furthermore, a tube bottom extending radially inward is provided at one end of the first outer tube facing the air extraction direction of the guide tube, a first through hole is provided on the tube bottom, and the aperture of the first through hole matches the outer diameter of the guide tube.

[0011] Those skilled in the art will understand that the two ends of the guide pipe are respectively for the extraction direction and the exhaust direction. In this solution, the guide pipe passes through the first through hole, so that the front end of the guide pipe can extend into the coal seam.

[0012] Furthermore, a first sealing ring is welded to the outside of the guide tube; along the radial direction, the thickness of the first sealing ring is equal to the thickness of the annular gap; and the first sealing ring is sealed and matched with the first outer tube.

[0013] This solution fixes the first sealing ring to the outside of the guide tube by welding. This structure facilitates the installation and positioning of the first outer tube. Specifically, when installing the first outer tube, it is only necessary to insert the end of the first outer tube away from the bottom of the tube into the outside of the guide tube from the end of the guide tube in the direction of air extraction, until the bottom of the tube abuts against the first sealing ring. At this time, the positioning of the first outer tube is achieved. And the first sealing ring is sealed with the first outer tube, so the first sealing ring can seal the end of the annular gap close to the direction of air extraction. In addition, since the first sealing ring is located at one end of the annular gap, it can support the first outer tube from this end, reduce the pressure of the wall of the first through hole on the guide tube, and make the load of the formation on the guide tube more uniform and dispersed.

[0014] It can be seen that the first sealing ring in this solution plays the role of positioning, sealing and bearing at the same time.

[0015] Furthermore, an external thread is provided on the radial outer wall of the first sealing ring, and an internal thread section is provided on the inner wall of the first outer tube near the bottom of the tube; the external thread and the internal thread section are mutually matching airtight threads; and a first sealing ring is provided on the end face of the first sealing ring facing the bottom of the tube.

[0016] In this solution, the first outer tube and the first sealing ring are threadedly connected to each other, securing the first outer tube relative to the flow guide tube. The threaded connection is an airtight thread, sealing the radial outer wall of the first sealing ring. This solution also seals the axial end face of the first sealing ring via the first sealing ring. The airtight thread in this solution can be implemented using any conventional thread with airtight properties.

[0017] Furthermore, it also includes a second sealing ring located in the annular gap; along the axial direction of the guide tube, the second sealing ring is located at one end of the guide tube in the exhaust direction; along the radial direction, the thickness of the second sealing ring is equal to the thickness of the annular gap.

[0018] In this solution, the second sealing ring is located within the annular gap, and alongside the first sealing ring, it supports the first outer tube from both ends, ensuring a more even and distributed load from the formation on the flow tube. Furthermore, the second sealing ring seals the outer end of the annular gap, preventing the gas adsorbent material and gas from escaping. In this solution, the second sealing ring provides both sealing and load-bearing functions.

[0019] Furthermore, the second sealing ring is welded to the guide tube and the first outer tube; and a second sealing ring and a third sealing ring are respectively provided on the radial inner wall and outer wall of the second sealing ring.

[0020] After filling the annular gap with gas adsorbent material, this solution simultaneously welds the second sealing ring to the flow guide tube and the first outer tube. This improves the integrity of the device, facilitates overall transport and movement, and further ensures the sealing of the annular gap, reducing the risk of gas spillage. The second and third sealing rings are used to ensure the sealing performance between the second sealing ring and the flow guide tube and the first outer tube, respectively.

[0021] Furthermore, the first gas concentration monitoring device is installed on the second sealing ring and is located at one end of the second sealing ring facing the exhaust direction of the guide pipe.

[0022] In this solution, after the gas adsorption material is filled into the annular gap, the second sealing ring is installed into the annular gap, and the first gas concentration monitoring device can be installed simultaneously.

[0023] Furthermore, it also includes a second outer tube for being sleeved outside the first outer tube, the inner diameter of the second outer tube is equal to the outer diameter of the first outer tube; an anti-overflow component is provided at one end of the second outer tube facing the air extraction direction of the guide tube.

[0024] During the use of the existing flow guide tube, the outside of the tube needs to be sealed with a relevant sealing device between the tube and the formation opening; in the present application, when the flow guide tube is taken out for maintenance or replacement, the existing sealing device cannot temporarily seal the hole formed after the flow guide tube is taken out, which easily poses a safety hazard. The second outer tube in this solution can also overcome the above-mentioned defects. Since the second outer tube is movably mounted on the outside of the first outer tube, when the flow guide tube is maintained or replaced, the second outer tube is kept stationary in the formation hole, and only the first outer tube and the flow guide tube need to be taken out for maintenance or replacement. During the maintenance or replacement process, it is only necessary to seal the inside of the second outer tube with the overflow prevention component, avoiding the problem of needing to seal the pipe and the formation hole again, and significantly improving the safety in the well during the maintenance or replacement of the flow guide tube. Of course, when the present solution is working, the second outer tube needs to be sealed with the existing sealing device between the second outer tube and the hole wall of the formation hole.

[0025] In addition, the second outer tube in this solution is attached to the first outer tube, and the external protective component can be thickened by the second outer tube to provide protection for the first outer tube, so as to further improve the ability of the guide tube in this application to resist physical deformation; in addition, the second outer tube can block the part of the guide tube extending outside the first outer tube, while protecting the part of the guide tube extending outside the first outer tube, further improving the integrity of this application.

[0026] Furthermore, the anti-overflow component includes a partition arranged inside the second outer tube, the partition divides the second outer tube axially into a first area close to the air extraction direction of the guide tube and a second area close to the air exhaust direction of the guide tube; a second through hole is opened on the partition, the aperture of the second through hole is equal to the outer diameter of the guide tube, and a limiting member that cannot pass through the second through hole is fixed on the outer wall of the guide tube, and the limiting member is located in the second area; it also includes a baffle hinged on the surface of the partition facing the first area, and a torsion spring for driving the baffle to seal the second through hole; when the limiting member abuts against the partition, the guide tube pushes open the baffle.

[0027] When the front end of the guide tube is within the second zone, the baffle, acting under the action of the torsion spring, blocks the second through-hole. At this point, coalbed methane in the formation is trapped in the first zone and cannot escape. The guide tube is pushed forward until the stopper contacts the baffle, at which point the front end of the guide tube pushes open the baffle, allowing normal gas extraction operations. When maintaining or replacing the guide tube, the second outer tube remains stationary within the formation hole, and the first outer tube and guide tube are withdrawn. The baffle, acting under the action of the torsion spring, automatically blocks the second through-hole.

[0028] This solution realizes automatic sealing of the inside of the second outer tube when maintaining or replacing the guide tube, eliminating the need for manual sealing operation on the inside of the second outer tube, achieving the effect of sealing as you take it out, and further ensuring safety during the maintenance or replacement of the guide tube.

[0029] Furthermore, it also includes a second gas concentration monitoring device located in the second area; when the limiting member abuts against the partition, the second gas concentration monitoring device is located between the partition and the first outer tube.

[0030] The second gas concentration monitoring device is always located on the side of the baffle facing the exhaust pipe. During normal operation, it monitors the seal between the pipe and the baffle, and whether the baffle itself is damaged. During maintenance or replacement of the pipe, it can also monitor the functioning of the overflow prevention assembly. If the second gas concentration monitoring device detects abnormal gas concentration, it will promptly issue an alert to staff, prompting them to take emergency measures as soon as possible based on the specific working conditions.

[0031] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0032] 1. The coal mine gas extraction equipment of the present invention can reduce the risk of the guide pipe being directly corroded and eroded by the formation fluid, while preventing the forces generated by the release of ground stress and coal seam collapse from directly acting on the guide pipe, thereby reducing the risk of physical damage to the guide pipe.

[0033] 2. The present invention provides a gas extraction device for coal mines. When the guide pipe is damaged, the gas enters the annular gap and is adsorbed by the gas adsorption material, thereby reducing the gas concentration in the air and reducing the risk of explosion. In addition, when the first outer pipe is squeezed and deformed by the action of the stratum, the gas adsorption material filled inside can also play a buffering role. The energy absorption effect is achieved through the mutual friction and extrusion of the gas adsorption material, which can effectively reduce the impact load on the guide pipe caused by coal seam collapse, etc., and significantly improve the physical protection effect of the guide pipe.

[0034] 3. The gas extraction equipment for coal mines of the present invention significantly improves the safety in the well during the maintenance or replacement of the guide tube by setting up the second outer tube and its supporting structure; and realizes automatic sealing of the inside of the second outer tube during the maintenance or replacement of the guide tube, without the need for manual sealing operation on the inside of the second outer tube, thus achieving the effect of sealing as soon as it is taken out.

[0035] 4. The coal mine gas extraction equipment of the present invention can timely monitor the abnormal increase of gas concentration when the equipment is damaged, and then prompt the staff to take corresponding response measures to ensure the safety of underground operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0037] Figure 1 is a cross-sectional view of a specific embodiment 1 of the present invention;

[0038] Figure 2 is a cross-sectional view of a specific embodiment 2 of the present invention;

[0039] Figure 3 A schematic structural diagram of a welding device in a specific embodiment of the present invention;

[0040] Figure 4 A cross-sectional view of a welding device passing through the axis of the strip groove in a specific embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the use of a welding device in a specific embodiment of the present invention.

[0042] Markings and corresponding parts names in the accompanying drawings:

[0043] 1-flow guide tube, 2-first outer tube, 201-tube bottom, 3-annular gap, 4-first sealing ring, 5-first sealing ring, 6-second sealing ring, 7-second sealing ring, 8-third sealing ring, 9-second outer tube, 901-first area, 902-second area, 10-partition, 11-limiting member, 12-baffle, 13-torsion spring, 14-first gas concentration monitoring device, 15-second gas concentration monitoring device. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the examples and drawings. The schematic embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of this application.

[0045] Example 1:

[0046] like Figure 1 The illustrated coal mine gas drainage equipment includes a flow guide pipe 1 and a first outer pipe 2 fixedly mounted outside the flow guide pipe 1. An annular gap 3 is defined between the inner wall of the first outer pipe 2 and the outer wall of the flow guide pipe 1. The annular gap 3 is sealed at both axial ends of the flow guide pipe 1 and is filled with a gas adsorption material. The equipment also includes a first gas concentration monitoring device 14 located within the annular gap 3. The first outer pipe 2 is coaxial with the flow guide pipe 1.

[0047] A tube bottom 201 extending radially inward is provided at one end of the first outer tube 2 facing the air extraction direction of the flow guide tube 1 , and a first through hole is defined in the tube bottom 201 . The aperture of the first through hole is equal to the outer diameter of the flow guide tube 1 .

[0048] A first sealing ring 4 is welded to the outside of the flow guide tube 1 ; along the radial direction, the thickness of the first sealing ring 4 is equal to the thickness of the annular gap 3 ; the first sealing ring 4 is in sealing cooperation with the first outer tube 2 .

[0049] An external thread is provided on the radial outer wall of the first sealing ring 4, and an internal thread section is provided on the inner wall of the first outer tube 2 close to the tube bottom 201; the external thread and the internal thread section are mutually matching airtight threads; a first sealing ring 5 is provided on the end face of the first sealing ring 4 facing the tube bottom 201.

[0050] It also includes a second sealing ring 6 located in the annular gap 3; along the axial direction of the guide tube 1, the second sealing ring 6 is located at one end of the guide tube 1 in the exhaust direction; along the radial direction, the thickness of the second sealing ring 6 is equal to the thickness of the annular gap 3.

[0051] The second sealing ring 6 is welded to the flow guide tube 1 and the first outer tube 2 ; a second sealing ring 7 and a third sealing ring 8 are respectively provided on the radial inner wall and outer wall of the second sealing ring 6 .

[0052] The first gas concentration monitoring device 14 is installed on the second sealing ring 6 and is located at one end of the second sealing ring 6 facing the exhaust direction of the flow guide pipe 1; the wire corresponding to the first gas concentration monitoring device 14 passes through the second sealing ring 6 and extends outward.

[0053] exist Figure 1 In the figure, the left side of the flow guide pipe 1 is the air extraction direction, and the right side is the air exhaust direction.

[0054] In this embodiment, the first sealing ring 5 , the second sealing ring 7 and the third sealing ring 8 are all rubber rings.

[0055] The gas adsorption material in this embodiment is activated carbon and / or graphene composite material.

[0056] Example 2:

[0057] A coal mine gas drainage device, based on Example 1, further includes a second outer tube 9 for sleeved outside the first outer tube 2, the inner diameter of the second outer tube 9 being equal to the outer diameter of the first outer tube 2; an overflow prevention assembly is provided at one end of the second outer tube 9 facing the gas extraction direction of the flow guide tube 1. The second outer tube 9 is coaxial with the first outer tube 2.

[0058] The overflow prevention component includes a partition 10 arranged inside the second outer tube 9, and the partition 10 divides the second outer tube 9 axially into a first area 901 close to the suction direction of the guide tube 1 and a second area 902 close to the exhaust direction of the guide tube 1; a second through hole is provided on the partition 10, and the aperture of the second through hole is equal to the outer diameter of the guide tube 1, and a limit member 11 that cannot pass through the second through hole is provided on the outer wall of the guide tube 1, and the limit member 11 is located in the second area 902; it also includes a baffle 12 hinged on the surface of the partition 10 facing the first area 901, and a torsion spring 13 for driving the baffle 12 to block the second through hole; when the limit member 11 abuts against the partition 10, the guide tube 1 pushes open the baffle 12.

[0059] In this embodiment, the baffle 12 is connected to the partition 10 via a rotating shaft, and the torsion spring 13 acts on the rotating shaft.

[0060] It also includes a second gas concentration monitoring device 15 located in the second area 902 ; when the limiting member 11 abuts against the partition 10 , the second gas concentration monitoring device 15 is located between the partition 10 and the first outer tube 2 .

[0061] Preferably, a wiring groove is provided on the inner wall or inside of the second outer tube 9 , and the wire corresponding to the second gas concentration monitoring device 15 passes through the wiring groove and extends outward.

[0062] Example 3:

[0063] A method for installing coal mine gas drainage equipment, used to install the gas drainage equipment described in Example 2, comprises the following steps:

[0064] S1, connecting the flow guide tube 1, the first outer tube 2, the first sealing ring 4 and the second sealing ring 6 into an integral structure;

[0065] S2. A hole matching the second outer tube 9 is opened on the inner wall of the mine, the second outer tube 9 is inserted into the hole, and an existing sealing device is used to seal the space between the outer end of the second outer tube 9 and the wall of the hole;

[0066] S3. Insert the entire structure into the second outer tube 9 until the limiting member 11 abuts against the surface of the partition 10.

[0067] The blocking device in this embodiment may be an annular plug or other components that can play a temporary blocking role.

[0068] In a more preferred embodiment, before the second outer tube 9 is inserted into the hole, a layer of curing agent is coated on the outer wall of the second outer tube 9, and / or after the second outer tube 9 is inserted into the hole, the curing agent is squeezed between the second outer tube 9 and the hole wall. The curing agent can be implemented as cement mortar.

[0069] In a more preferred embodiment, after the stopper 11 abuts against the surface of the partition 10, the first outer tube 2 and the second outer tube 9 are temporarily fixed. For example, the ends of the first outer tube 2 and the second outer tube 9 facing the exhaust direction of the air guide tube 1 are temporarily fixed by means of a lock, a snap, or a magnet to prevent the first outer tube 2 from rotating or retreating.

[0070] Example 4:

[0071] A method for installing coal mine gas drainage equipment, based on Example 3, the connection as an integral structure in step S1 is realized based on a welding device, and the welding device in this embodiment is as follows Figure 3 and Figure 4 Shown, including:

[0072] The device further includes a platform 16 and a back plate 17 extending above the platform 16. A strip groove 18 is defined on the top surface of the platform 16, and a first pipe clamp 19 is disposed on the platform 16 at one end of the strip groove 18. A second pipe clamp 20 is slidably disposed on the back plate 17, and a rotation mechanism is included for driving the second pipe clamp 20 to rotate. The axis of the first pipe clamp 19 is parallel to the long axis of the strip groove 18, and the second pipe clamp 20 faces the first pipe clamp 19, with the axis of the second pipe clamp 20 always coplanar with the long axis of the strip groove 18. A welding station is provided at one end of the strip groove 18 near the first pipe clamp 19. A welding gun and its associated components can be installed at the welding station to facilitate operation by the welder.

[0073] The first pipe clamp 19 is mounted on a first slider 21 , and the first slider 21 is slidably fitted on a first slide rail 22 . The first slide rail 22 is located at one end of the strip groove 18 , and the first slide rail 22 is parallel to the long axis of the strip groove 18 .

[0074] This embodiment further includes a first driving device for driving the first sliding block 21 to slide on the first sliding rail 22 .

[0075] A second slide rail 23 is provided on one side surface of the back plate 17 facing the strip groove 18 . The second slide rail 23 is parallel to the top surface of the platform 16 . A second slider 24 is slidably fitted on the second slide rail 23 . The second pipe clamp 20 is connected to the second slider 24 .

[0076] The rotating mechanism in this embodiment includes a motor 25 fixedly mounted on the second slider 24 , the output end of the motor 25 is connected to the mounting seat 26 , and the second pipe clamp 20 is arranged on the mounting seat 26 ; the rotating shaft of the output end of the motor 25 is perpendicular to the surface of the back plate 17 .

[0077] This embodiment further includes a second driving device for driving the second sliding block 24 to slide on the second sliding rail 23 .

[0078] In this embodiment, both the first pipe clamp 19 and the second pipe clamp 20 can be implemented using existing pipe or bar clamps, preferably using chucks to facilitate adaptation to pipes of different diameters.

[0079] The first driving device and the second driving device in this embodiment can be implemented by any linear driving device in the prior art, preferably a cylinder, a linear motor or an electric push rod.

[0080] The motor 25 in this embodiment is preferably a servo motor or a stepper motor.

[0081] In a more preferred embodiment, a lifting platform 27 is provided at one end of the bottom of the strip groove 18 near the direction where the first pipe clamp 19 is located; the lifting platform 27 is located below the second slide rail 23. A sensing device 28 for sensing the welded pipe is provided on the top of the lifting platform 27.

[0082] A lifting device 29 is provided at one end of the bottom of the strip groove 18 away from the first pipe clamp 19; a bearing member 30 is provided at the top of the lifting device 29. The top surface of the bearing member 30 is set as an arc surface, and the axis of the arc surface is parallel to the long axis of the strip groove 18.

[0083] In this embodiment, the lifting platform 27 and the lifting device 29 can be implemented by existing lifting equipment, and the sensing device 28 is preferably implemented by a pressure sensor, a distance sensor, or a camera.

[0084] The method of using the welding device in this embodiment is as follows Figure 5 As shown, the following steps are included:

[0085] Step S1: Move the first pipe clamp 19 to one end close to the strip groove 18, rotate the second pipe clamp 20 to be coaxial with the first pipe clamp 19, and pass the guide pipe 1 through the first pipe clamp 19 and the second pipe clamp 20; make the first pipe clamp 19 clamp the front end of the guide pipe 1; drive the lifting device 29 to rise, so that the bearing member 30 abuts against the bottom end of the guide pipe 1; at this time, the state is as follows: Figure 5 As shown in the left picture in the upper middle row;

[0086] Step S2: Move the second pipe clamp 20 to the front end of the guide pipe 1 and move the first pipe clamp 19 to the area away from the guide pipe 1; start the rotating mechanism and drive the second pipe clamp 20 to rotate so that the tail end of the guide pipe 1 enters the strip groove 18 downward. During this process, the lifting device 29 is driven to descend. The descending rate is based on the premise of not interfering with the rotation of the guide pipe 1; when the guide pipe 1 rotates to a vertical state, determine whether the guide pipe 1 is directly above the lifting platform 27. If not, move the second pipe clamp 20 so that the guide pipe 1 is directly above the lifting platform 27; raise the lifting platform 27 until the lifting platform 27 abuts against the bottom of the guide pipe 1; the state at this time is as follows: Figure 5 As shown in the middle picture in the upper middle row;

[0087] Step S3: Put the first sealing ring 4 on the top of the guide tube 1 and weld the first sealing ring 4 to the outside of the guide tube 1; loosen the clamping of the second tube clamp 20, screw in the first outer tube 2 from top to bottom, and make the first outer tube 2 and the first sealing ring 4 threaded together until the first sealing ring 4 abuts against the bottom 201 of the tube, and use the second tube clamp 20 to clamp the first outer tube 2; weld the bottom 201 of the tube to the guide tube 1; the state at this time is as follows: Figure 5 As shown in the picture on the right of the upper middle row;

[0088] Step S4: The lifting platform 27 is lowered and reset, and the rotating mechanism is started to drive the second pipe clamp 20 to rotate, so that the guide tube 1 and the first outer tube 2 gradually leave the strip groove 18 and return to the horizontal state. During this process, when the first outer tube 2 or the guide tube 1 reaches the top of the lifting device 29, the lifting device 29 is synchronously lifted up by the first outer tube 2 or the guide tube 1 until the second pipe clamp 20 is reset to be coaxial with the first pipe clamp 19; then the first pipe clamp 19 is moved to the end close to the strip groove 18, so that the first pipe clamp 19 re-clamps the front end of the guide tube 1; at this time, the state is as follows: Figure 5 As shown in the right picture in the lower middle row;

[0089] Step S5: Move the second tube fixture 20 to the tail end of the first outer tube 2, and move the first tube fixture 19 to the area away from the guide tube 1; start the rotation mechanism and drive the second tube fixture 20 to rotate, so that the front end of the first outer tube 2 is downwardly inserted into the strip groove 18; when the first outer tube 2 is rotated to a vertical state, the front end of the first outer tube 2 faces downward and the tail end faces upward; move the second tube fixture 20 so that the guide tube 1 is directly above the lifting platform 27; raise the lifting platform 27 until the lifting platform 27 abuts against the bottom of the guide tube 1; fill the annular gap 3 with gas adsorption material from top to bottom; the state at this time is as follows: Figure 5 As shown in the middle picture in the lower middle row;

[0090] Step S6, install the second sealing ring 6 from the top into the annular gap 3, and weld the second sealing ring 6 to the guide tube 1 and the first outer tube 2; at this time, the state is as follows: Figure 5 As shown in the lower left image, the welding process is now complete, and the entire structure, including the flow guide tube 1, first outer tube 2, first sealing ring 4, second sealing ring 6, and the gas adsorbent material within, can be removed. Of course, this removal process can also be accomplished by rotating the second tube fixture 20, moving the entire structure out of the strip groove and into a horizontal position; this rotation can also be synchronized with the lifting device 29.

[0091] Those skilled in the art should understand that the front end in this embodiment refers to the end of the guiding flow tube 1 and the first outer tube 2 facing the depth of the coal seam when working, that is, the end facing the direction of gas extraction; the tail end in this embodiment refers to the end of the guiding flow tube 1 and the first outer tube 2 facing the outside of the coal seam when working, that is, the end facing the direction of exhaust.

[0092] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0093] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In addition, the term "connected" as used in this document, unless otherwise specified, may refer to a direct connection or an indirect connection via other components.

Claims

1. A gas drainage device for coal mines, comprising a flow guide pipe (1), characterized in that: It also includes a first outer tube (2) fixedly sleeved outside the guide tube (1), an annular gap (3) is provided between the inner wall of the first outer tube (2) and the outer wall of the guide tube (1), the annular gap (3) is sealed at both axial ends of the guide tube (1), and the annular gap (3) is filled with a gas adsorption material; it also includes a first gas concentration monitoring device (14) located in the annular gap (3); the first outer tube (2) is provided with a tube bottom (201) extending radially inward at one end facing the gas extraction direction of the guide tube (1), a first through hole is provided on the tube bottom (201), and the aperture of the first through hole matches the outer diameter of the guide tube (1); A first sealing ring (4) is welded to the outside of the flow guide tube (1); in the radial direction, the thickness of the first sealing ring (4) is equal to the thickness of the annular gap (3); the first sealing ring (4) is in sealing cooperation with the first outer tube (2); It also includes a second sealing ring (6) located in the annular gap (3); along the axial direction of the guide tube (1), the second sealing ring (6) is located at one end of the guide tube (1) in the exhaust direction; along the radial direction, the thickness of the second sealing ring (6) is equal to the thickness of the annular gap (3).

2. A coal mine gas drainage equipment according to claim 1, characterized in that: The radial outer wall of the first sealing ring (4) is provided with an external thread, and the inner wall of the first outer tube (2) close to the tube bottom (201) is provided with an internal thread section; the external thread and the internal thread section are mutually matching airtight threads; and a first sealing ring (5) is provided on the end face of the first sealing ring (4) facing the tube bottom (201).

3. The coal mine gas drainage equipment according to claim 1, characterized in that: The second sealing ring (6) is welded to the guide tube (1) and the first outer tube (2); a second sealing ring (7) and a third sealing ring (8) are respectively provided on the radial inner wall and outer wall of the second sealing ring (6).

4. The coal mine gas drainage equipment according to claim 1, characterized in that: The first gas concentration monitoring device (14) is mounted on the second sealing ring (6) and is located at one end of the second sealing ring (6) facing the exhaust direction of the flow guide pipe (1).

5. The coal mine gas drainage equipment according to claim 1, characterized in that: It also includes a second outer tube (9) for being sleeved outside the first outer tube (2), the inner diameter of the second outer tube (9) being equal to the outer diameter of the first outer tube (2); and an anti-overflow component is provided at one end of the second outer tube (9) facing the air extraction direction of the flow guide tube (1).

6. The coal mine gas drainage equipment according to claim 5, characterized in that: The overflow prevention component comprises a partition (10) arranged inside the second outer tube (9), the partition (10) divides the second outer tube (9) axially into a first area (901) close to the air extraction direction of the guide tube (1) and a second area (902) close to the air exhaust direction of the guide tube (1); a second through hole is provided on the partition (10), the aperture of the second through hole is equal to the outer diameter of the guide tube (1), and a limiting member (11) that cannot pass through the second through hole is provided on the outer wall of the guide tube (1), and the limiting member (11) is located in the second area (902); and the component further comprises a baffle (12) hingedly connected to the surface of the partition (10) on the side facing the first area (901), and a torsion spring (13) for driving the baffle (12) to block the second through hole; when the limiting member (11) abuts against the partition (10), the guide tube (1) pushes open the baffle (12).

7. The coal mine gas drainage equipment according to claim 6, characterized in that: It also includes a second gas concentration monitoring device (15) located in the second area (902); when the limiting member (11) abuts against the partition (10), the second gas concentration monitoring device (15) is located between the partition (10) and the first outer tube (2).

Images