Gas emission early warning drainage device for underground coal mine

Abstract

The invention discloses a coal mine underground gas emission early warning drainage device, which relates to the technical field of gas emission, and comprises a first drainage pipe body, the lower end of the first drainage pipe body is fixedly connected with a second drainage pipe body, the top end of the first drainage pipe body is fixedly connected with a gas inlet pipe, and the outer surface of the first drainage pipe body is fixedly connected with a maintenance plate; an air outlet pipe is fixedly connected to the lower end of the second drainage pipe body, an early warning mechanism is arranged on the second drainage pipe body, the filter assembly is driven to descend by means of the weight difference generated by impurity accumulation through the arrangement of the early warning mechanism, and then the impurity accumulation condition of the filter assembly is judged under the cooperation of an arc-shaped sliding rod and an observation ruler; according to the gas filtering device, the condition that the filter screen is replaced too early or too late when a worker regularly replaces the filter screen is avoided, the filter screen can be replaced at a relatively accurate time node, the problem that the cost is increased or the gas filtering effect is influenced is prevented, and the quality of the filtered gas is ensured.

Description

Technical Field

[0001] This invention relates to the field of gas emission technology, specifically to a gas emission early warning and drainage device for underground coal mines. Background Technology

[0002] A coal mine underground gas drainage device is a specialized piece of equipment used in coal mines. It is mainly used to extract and drain gas from coal seams or goaf areas to reduce gas concentration, prevent gas accumulation, and thus reduce the occurrence of accidents such as gas explosions.

[0003] In existing technologies, underground gas extraction devices in coal mines extract gas from coal seams or goaf areas through boreholes and extraction pipelines. At the same time, filters need to be installed in the pipelines to remove impurities from the gas during the extraction process and improve the quality of gas extraction.

[0004] While the above process effectively addresses the gas extraction problem, in practical applications, to ensure the filtration effect of the filter screen, workers need to replace it regularly. Furthermore, because the gas distribution in the coal seam is uneven during extraction—some areas have high gas content while others have low content—and mining operations alter the state of the coal seam, causing changes in the gas release rate, even within the same area, the gas concentration will change with continuous release and extraction. Therefore, when the gas concentration is high, it is necessary to increase the extraction power of the device to improve extraction efficiency. The efficiency of gas extraction varies, and at low concentrations, the extraction power needs to be reduced to minimize energy consumption. Therefore, the filtration efficiency of the filter screen will increase or decrease with the gas concentration, leading to the filter screen saturating too early or too late. When staff replace the filter screen based on experience, it will result in waste if the filter screen is not yet saturated. Furthermore, if the filter screen has been saturated for a period of time before replacement, it will not be able to effectively filter the gas before or after replacement, thus failing to provide a good early warning of filter screen saturation and reducing the quality of gas extraction.

[0005] Therefore, this invention proposes a gas emission early warning and drainage device for underground coal mines to solve the above problems. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a gas emission early warning and drainage device for underground coal mines, so as to solve the problem in the prior art that workers cannot accurately determine whether the filter screen is saturated when gas is being drained.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a gas emission early warning and drainage device for underground coal mines, comprising a first drainage pipe body, a second drainage pipe body fixedly connected to the lower end of the first drainage pipe body, an air inlet pipe fixedly connected to the top end of the first drainage pipe body, a maintenance plate fixedly connected to the outer surface of the first drainage pipe body, an air outlet pipe fixedly connected to the lower end of the second drainage pipe body, an early warning mechanism provided on the second drainage pipe body, the early warning mechanism comprising at least two grooves, each groove being formed on the outer surface of the second drainage pipe body, and a connecting rod being provided therein, an arc-shaped sliding rod fixedly connected to the bottom of the connecting rod, a first magnetic sheet fixedly connected to the bottom of the arc-shaped sliding rod, a first magnetic block fixedly connected to the bottom of each groove, an annular groove being formed at the top of the second drainage pipe body, and a filter assembly being provided at the top of the connecting rod, the filter assembly being slidably connected to the annular groove for filtering gas, the filter assembly being able to slide downwards under the influence of gravity of impurities, the filter assembly being able to drive the connecting rod to move downwards when sliding downwards, and the early warning mechanism being used to detect the saturation of the filter assembly.

[0008] Preferably, the filter assembly includes a mounting ring slidably disposed on the inner surface of the first extraction tube, the outer surface of the mounting ring being in contact with the inner surface of the first extraction tube, a filter screen being fixedly connected to the inner side of the mounting ring, a sliding ring being provided at the bottom of the mounting ring, the sliding ring being slidably connected to the arcuate groove at the top of the second extraction tube, a support spring being fixedly connected between the sliding ring and the annular groove, the lower end of the sliding ring being located in the groove, and the sliding ring being fixedly connected to the connecting rod.

[0009] Preferably, the connecting rod can slide under the push of the sliding ring, the first magnetic sheet attracts the first magnetic block when it is close to it, and a transparent cover is fixedly connected to the outside of the groove, forming a sealed space between the transparent cover and the groove.

[0010] Preferably, the early warning mechanism further includes an observation ruler, which is fixedly connected to the groove.

[0011] Preferably, the device also includes a limiting mechanism for fixing the mounting ring. The limiting mechanism includes two sliding rods, both of which are slidably connected to the outer surface of the lower sliding ring. A return spring is fixedly connected between the sliding rod and the lower sliding ring. A pressure block is fixedly connected to the side of the sliding rod away from the return spring. A pin is fixedly connected to the side of the sliding rod away from the return spring. A fixing plate is fixedly connected to the bottom of the mounting ring. The pin is inserted into the fixing plate.

[0012] Preferably, the pressure block has an inclined surface on one side. When the pressure block moves downward, the sliding rod slides towards the return spring due to the compression of the annular groove at the top of the second extraction tube.

[0013] Preferably, the system also includes a cleaning mechanism for cleaning the top of the filter screen. The cleaning assembly includes a support frame that is fixedly connected to the inner surface of the first extraction tube. A rotating shaft is rotatably mounted inside the support frame. A fan impeller is fixedly connected to the top of the rotating shaft, and a sliding shaft is slidably connected to the bottom of the rotating shaft. A cleaning wheel is fixedly connected to the bottom of the sliding shaft.

[0014] Preferably, a plurality of guide strips are fixedly connected to the outer surface of the sliding shaft, and the plurality of guide strips are slidably connected to the rotating shaft, so that the rotating shaft can drive the sliding shaft to rotate when it rotates, and the bottom of the cleaning wheel contacts the filter screen.

[0015] Preferably, the cleaning mechanism further includes two connecting posts, both of which are slidably inserted into the top of the second extraction tube. The top of each connecting post passes through a mounting ring, and the bottom of each connecting post slides within a groove. A spring telescopic rod is fixedly connected to one side of the groove, and the lower end of the spring telescopic rod is fixedly connected to the connecting post. A second magnetic sheet is fixedly connected to the bottom of the connecting post, and a second magnetic block is fixedly connected to the bottom of the groove. A limit block is provided on the outer surface of the connecting post, and the top of the limit block contacts the bottom of the mounting ring.

[0016] Preferably, the second magnetic sheet can attract the second magnetic block when it is close to it, and the connecting stop post passes through the mounting ring at one end and is located on the rotation trajectory of the cleaning wheel.

[0017] Compared with the prior art, the present invention provides a gas emission early warning and drainage device for underground coal mines, which has the following beneficial effects: 1. By setting up an early warning mechanism, the weight difference generated by the accumulation of impurities drives the filter components to descend. Then, with the cooperation of the arc-shaped slide bar and the observation ruler, the impurity accumulation of the filter components can be judged. This avoids the situation where the staff replaces the filter screen too early or too late when it is scheduled. The filter screen can be replaced at a more accurate time, preventing the increase in costs or the impact on the gas filtration effect, and ensuring the quality of the gas filtration.

[0018] 2. Through the cooperation of the limiting mechanism and the early warning mechanism, the filter screen can be stabilized during operation by limiting the fixed plate through the insertion post. When the filter screen accumulates a lot of impurities and needs to be replaced, the insertion post and the fixed plate can be automatically disengaged by the cooperation of the sliding ring, the annular groove and the pressure block. When the early warning mechanism reaches the warning range, the limiting mechanism is activated and automatically releases the limiting work on the installation ring and the filter screen, saving the staff the steps of disassembling the installation ring and the filter screen and reducing the time cost of replacing the filter screen.

[0019] 3. Through the cooperation of the early warning mechanism and the cleaning mechanism, the filter screen can maintain a good filtration effect even after a period of use. At the same time, when the installation ring and filter screen are disassembled, the cleaning wheel removes impurities from the filter screen, which reduces the cleaning time of the staff and improves the replacement efficiency of the filter screen. This reduces the downtime of the first and second extraction pipes and ensures the efficiency of gas filtration. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 In this invention Figure 1 Vertical sectional view of the structure; Figure 3 In this invention Figure 1 Mid-section cross-sectional view of the structure; Figure 4 In this invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a partial cross-sectional view of the second extraction tube in this invention; Figure 6 In this invention Figure 5 Enlarged structural diagram at point B; Figure 7 In this invention Figure 1 Partial sectional view of the structure; Figure 8 In this invention Figure 7 Enlarged structural diagram at point C.

[0021] In the picture: 1. First extraction / drainage pipe; 11. Inlet pipe; 12. Inspection plate; 2. Second extraction / drainage pipe; 21. Outlet pipe; 301. Mounting ring; 302. Filter screen; 303. Sliding ring; 304. Groove; 305. Connecting rod; 306. Arc-shaped slide bar; 307. First magnetic plate; 308. First magnetic block; 309. Observation scale; 310. Support spring; 401. Sliding rod; 402. Return spring; 403. Pressure block; 404. Insert post; 405. Fixing plate; 501. Support frame; 502. Rotating shaft; 503. Fan impeller; 504. Sliding shaft; 505. Cleaning wheel; 506. Connecting stop; 507. Spring telescopic rod; 508. Second magnetic sheet; 509. Second magnetic block. Detailed Implementation

[0022] 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.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] Embodiments of the present invention Please refer to Figures 1 to 8 As shown: To address the problems mentioned in the technical solutions, this application provides a gas emission early warning and drainage device for underground coal mines, including a first drainage pipe body 1, a second drainage pipe body 2 fixedly connected to the lower end of the first drainage pipe body 1, an air inlet pipe 11 fixedly connected to the top end of the first drainage pipe body 1, a maintenance plate 12 fixedly connected to the outer surface of the first drainage pipe body 1, an air outlet pipe 21 fixedly connected to the lower end of the second drainage pipe body 2, and an early warning mechanism provided on the second drainage pipe body 2. The early warning mechanism includes at least two grooves 304, each groove 304 being formed on the outer surface of the second drainage pipe body 2, and having a recessed design. A connecting rod 305 is provided, and an arc-shaped slide rod 306 is fixedly connected to the bottom of the connecting rod 305. A first magnetic sheet 307 is fixedly connected to the bottom of the arc-shaped slide rod 306. A first magnetic block 308 is fixedly connected to the bottom of each groove 304. An annular groove is opened at the top of the second extraction tube 2. A filter assembly is provided at the top of the connecting rod 305. The filter assembly is slidably connected to the annular groove and is used to filter gas. The filter assembly can slide downward under the influence of the gravity of impurities. When the filter assembly slides downward, it can drive the connecting rod 305 to move downward. An early warning mechanism is used to detect the saturation of the filter assembly.

[0025] The filter assembly includes a mounting ring 301, which is slidably disposed on the inner surface of the first extraction tube 1. The outer surface of the mounting ring 301 is in contact with the inner surface of the first extraction tube 1. A filter screen 302 is fixedly connected to the inner side of the mounting ring 301. A sliding ring 303 is provided at the bottom of the mounting ring 301. The sliding ring 303 is slidably connected to the arc-shaped groove at the top of the second extraction tube 2. A support spring 310 is fixedly connected between the sliding ring 303 and the annular groove. The lower end of the sliding ring 303 is located in the groove 304. The sliding ring 303 is fixedly connected to the connecting rod 305. The connecting rod 305 can slide under the push of the sliding ring 303. The first magnetic sheet 307 attracts the first magnetic block 308 when it is close to it. A transparent cover is fixedly connected to the outside of the groove 304. A sealed space is formed between the transparent cover and the groove 304. The warning mechanism also includes an observation ruler 309, which is fixedly connected to the groove 304.

[0026] Further examples: Please refer to Figures 1 to 8 As shown: It also includes a limiting mechanism for fixing the mounting ring 301. The limiting mechanism includes two sliding rods 401, both of which are slidably connected to the outer surface of the lower sliding ring 303. A return spring 402 is fixedly connected between the sliding rods 401 and the lower sliding ring 303. A pressure block 403 is fixedly connected to the side of the sliding rods 401 away from the return spring 402. A pin 404 is fixedly connected to the side of the sliding rods 401 away from the return spring 402. A fixing piece 405 is fixedly connected to the bottom of the mounting ring 301. The pin 404 is inserted into the fixing piece 405. An inclined surface is provided on one side of the pressure block 403. When the pressure block 403 moves downward, the sliding rods 401 slide towards the return spring 402 due to the squeezing of the annular groove at the top of the second extraction tube 2. The fixing pieces 405 are symmetrically arranged at the bottom of the mounting ring 301, and the distance between the symmetrically arranged fixing pieces 405 is greater than the diameter of the lower sliding ring 303, so that the mounting ring 301 will not be interfered with by the lower sliding ring 303 when it is pulled out.

[0027] A further embodiment: Please refer to Figures 1 to 8 As shown: It also includes a cleaning mechanism for cleaning the top of the filter screen 302. The cleaning assembly includes a support frame 501, which is fixedly connected to the inner surface of the first extraction tube 1. A rotating shaft 502 is rotatably mounted inside the support frame 501. A fan impeller 503 is fixedly connected to the top of the rotating shaft 502. A sliding shaft 504 is slidably connected to the bottom of the rotating shaft 502. A cleaning wheel 505 is fixedly connected to the bottom of the sliding shaft 504. Multiple guide strips are fixedly connected to the outer surface of the sliding shaft 504. The multiple guide strips are slidably connected to the rotating shaft 502, so that the rotating shaft 502 can drive the sliding shaft 504 to rotate when it rotates. The bottom of the cleaning wheel 505 contacts the filter screen 302.

[0028] The cleaning mechanism also includes two connecting posts 506, both of which are slidably inserted into the top of the second extraction tube 2. The top of the connecting post 506 passes through the mounting ring 301, and the bottom of the connecting post 506 slides in the groove 304. A spring telescopic rod 507 is fixedly connected to one side of the groove 304, and the lower end of the spring telescopic rod 507 is fixedly connected to the connecting post 506. A second magnetic piece 508 is fixedly connected to the bottom of the connecting post 506, and a second magnetic block 509 is fixedly connected to the bottom of the groove 304. A limit block is provided on the outer surface of the connecting post 506, and the top of the limit block contacts the bottom of the mounting ring 301. When the second magnetic piece 508 approaches the second magnetic block 509, it can attract it. One end of the connecting post 506 that passes through the mounting ring 301 is located on the rotation trajectory of the cleaning wheel 505.

[0029] The working principle of all the content in the above embodiments is as follows: In the initial state: the support spring 310 is in normal condition, the cleaning wheel 505 contacts the filter screen 302 and the upper surface of the mounting ring 301 by gravity, the insertion post 404 is inserted into the fixing plate 405, at this time the mounting ring 301 cannot disengage from the top of the sliding ring 303, the reset spring 402 is in normal condition, the annular groove at the top of the second extraction tube 2 is on the trajectory of the downward sliding of the pressure block 403, the spring telescopic rod 507 is in normal condition, and because the connecting stop post 506 is provided with a limit block on its outer surface, the top of the limit block contacts the bottom of the mounting ring 301, so the connecting stop post 506 cannot slide upward.

[0030] The following describes the working process of early warning agencies and their beneficial effects: In use, the extracted gas enters the first extraction pipe 1 through the inlet pipe 11 and then passes through the filter screen 302. The filter screen 302 filters out most impurities, leaving them on the screen. The filtered gas then enters the second extraction pipe 2 and is discharged through the outlet pipe 21. Over time, as more and more impurities remain on the filter screen 302, its weight increases. This increased weight causes the mounting ring 301 to move downwards, which in turn causes the sliding ring 303 to slide downwards along the annular groove at the top of the second extraction pipe 2, compressing the support spring 310. Simultaneously, the downward sliding of the sliding ring 303 causes the connecting rod 305 to move downwards, causing the arc-shaped sliding rod 306 to slide downwards. This movement, along with the horizontal arc-shaped sliding rod... With the cooperation of 306 and longitudinal observation ruler 309, staff can observe the distance the arc-shaped slide bar 306 descends, thereby judging the saturation status of the filter screen 302. As the usage time increases, the impurities filtered on the filter screen 302 also increase, which in turn increases the compression of the support spring 310, thus increasing the descent distance of the arc-shaped slide bar 306. The first magnetic piece 307 gets closer and closer to the first magnetic block 308. When the arc-shaped slide bar 306 slides down to the warning range of the observation ruler 309, the first magnetic piece 307 also enters the attraction range with the first magnetic block 308. Then, under the attraction of the first magnetic block 308, the sliding ring 303, connecting rod 305, and arc-shaped slide bar 306 slide down, and the first magnetic piece 307 and the first magnetic block 308 attract and stick together.

[0031] By setting up an early warning mechanism, the weight difference generated by the accumulation of impurities causes the filter component to descend. Then, with the cooperation of the arc-shaped slide bar 306 and the observation ruler 309, the impurity accumulation of the filter component can be judged. This avoids the situation where the staff replaces the filter screen 302 too early or too late when it is scheduled. The filter screen 302 can be replaced at a more accurate time, preventing problems such as increased costs or affecting the gas filtration effect, and ensuring the quality of gas filtration.

[0032] Please refer to the above work process. Figures 1 to 8.

[0033] The following describes the working process and beneficial effects of the limit mechanism: When the warning mechanism is in use, as the mass of the filter screen 302 increases, it causes the sliding ring 303 to descend, which in turn causes the pressure block 403 to descend. As the pressure block 403 descends, its inclined surface contacts the annular groove at the top of the second extraction tube 2. Through the pressure of the groove on the inclined surface of the pressure block 403, the return spring 402 is compressed, and the sliding rod 401 slides into the sliding ring 303. The pressure block 403 moves with the sliding rod 401. At the same time, the insertion post 404 moves away from the fixed plate 405. When the arc-shaped sliding rod 306 descends to the warning range of the observation ruler 309, the first magnetic plate 307 and the first magnetic block 30... When the 8 phases are attracted, the sliding rod 401 and the pressure block 403 slide into the groove of the lower ring 303, and the insertion post 404 simultaneously disengages from the fixing plate 405, thereby canceling the limitation on the fixing plate 405. When the arc-shaped sliding rod 306 slides down to the warning range of the length of the observation ruler 309, when the first magnetic plate 307 and the first magnetic block 308 are attracted, the mounting ring 301 and the filter screen 302 simultaneously slide to the inspection plate 12. At this time, the staff observes the warning mechanism and determines that the filter screen 302 needs to be replaced. After opening the inspection plate 12, the mounting ring 301 and the filter screen 302 are taken out from the top of the lower ring 303 and then cleaned or replaced.

[0034] By cooperating with the limiting mechanism and the warning mechanism, the filter screen 302 can be stabilized during operation by limiting the fixing plate 405 through the insertion post 404. When the filter screen 302 accumulates a lot of impurities and needs to be replaced, the insertion post 404 and the fixing plate 405 can be automatically disengaged by the sliding ring 303, the annular groove and the pressure block 403. When the warning mechanism reaches the warning range, the limiting mechanism is activated and automatically releases the limiting work on the installation ring 301 and the filter screen 302, saving the staff the steps of disassembling and installing the installation ring 301 and the filter screen 302, and reducing the time cost of replacing the filter screen 302.

[0035] Please refer to the above work process. Figures 1 to 8 .

[0036] The following describes the working process and beneficial effects of the cleaning mechanism: During use, after the warning mechanism has been in use for a period of time, and before the first magnetic piece 307 attracts the first magnetic block 308, as the mounting ring 301, filter screen 302, and arc-shaped slide rod 306 move downwards, the mounting ring 301 can push the connecting stop 506 to slide downwards, and the spring telescopic rod 507 is stretched. When the second magnetic piece 508 enters the attraction range with the second magnetic block 509, and under the attraction force of the second magnetic block 509 on the second magnetic piece 508, the spring telescopic rod 507 continues to stretch, and the connecting stop 506 slides downwards, causing its top end to disengage from the mounting ring 301 and be at the bottom of the mounting ring 301. At this time, the connecting stop 506 is disengaged from the sliding trajectory of the cleaning wheel 505. Due to the flow of gas in the first extraction pipe 1, the fan impeller 503 is affected by the gas flow and begins to rotate, thereby driving the rotating shaft 502, fan impeller 503, and sliding shaft 504 to rotate. The sliding arrangement of the moving shaft 502 and the sliding shaft 504 ensures that the cleaning wheel 505 remains in contact with the upper surface of the filter screen 302 as it slides downwards. This allows for the cleaning and scraping of the top of the filter screen 302, removing some impurities from its upper surface. Furthermore, the centrifugal force generated by the rotation of the cleaning wheel 505 causes the removed impurities to slide onto the mounting ring 301, reducing their impact on the filter screen 302. This allows the filter screen 302 to maintain a good filtration effect even after a period of use. Additionally, the removal of impurities by the cleaning wheel 505 during subsequent disassembly of the mounting ring 301 and the filter screen 302 reduces the cleaning time required by operators, improving the replacement efficiency of the filter screen 302. This, in turn, reduces the downtime of the first and second extraction pipes 1 and 2, ensuring the efficiency of gas filtration.

[0037] It should be noted that when the cleaning mechanism is started, the cleaning wheel 505 can clean the upper surface of the filter screen 302. As the mounting ring 301 continues to move downward, after the first magnetic piece 307 attracts the first magnetic block 308, the connecting stop 506 is reinserted into the mounting ring 301, and the upper end is once again on the rotation trajectory of the cleaning wheel 505, so that the cleaning wheel 505 stops cleaning the filter screen 302 until the staff arrives to disassemble the filter screen 302. Due to the disengagement of the limiting mechanism, the insertion limit of the connecting stop 506 can temporarily limit the mounting ring 301 when the staff opens the inspection plate 12. After the staff opens the inspection plate 12, the mounting ring 301 can be slid upward a distance to disengage it from the insertion of the connecting stop 506. Then the mounting ring 301 can be pulled to finally remove the mounting ring 301 and the filter screen 302 from the cavity formed by the second extraction tube 2 and the first extraction tube 1.

[0038] Please refer to the above work process. Figures 1 to 8 .

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] 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 gas emission early warning and drainage device for underground coal mines, comprising a first drainage pipe body (1), a second drainage pipe body (2) fixedly connected to the lower end of the first drainage pipe body (1), an air inlet pipe (11) fixedly connected to the top end of the first drainage pipe body (1), a maintenance plate (12) fixedly connected to the outer surface of the first drainage pipe body (1), and an air outlet pipe (21) fixedly connected to the lower end of the second drainage pipe body (2), characterized in that, The second extraction tube (2) is equipped with an early warning mechanism; The warning mechanism includes at least two grooves (304), each groove (304) is opened on the outer surface of the second extraction tube (2), and a connecting rod (305) is provided inside it. An arc-shaped slide rod (306) is fixedly connected to the bottom of the connecting rod (305), and a first magnetic sheet (307) is fixedly connected to the bottom of the arc-shaped slide rod (306). A first magnetic block (308) is fixedly connected to the bottom of each groove (304). An annular groove is opened at the top of the second extraction tube (2), and a filter assembly is provided at the top of the connecting rod (305). The filter assembly is slidably connected to the annular groove and is used to filter the gas. The filter assembly can slide downward under the influence of the gravity of impurities. When the filter assembly slides downward, the filter connecting rod (305) moves downward. The warning mechanism is used to detect the saturation of the filter assembly.

2. The gas emission early warning and drainage device for underground coal mines according to claim 1, characterized in that: The filter assembly includes an installation ring (301), which is slidably disposed on the inner surface of the first extraction tube (1). The outer surface of the installation ring (301) is in contact with the inner surface of the first extraction tube (1). A filter screen (302) is fixedly connected to the inner side of the installation ring (301). A sliding ring (303) is provided at the bottom of the installation ring (301). The sliding ring (303) is slidably connected to the arc groove at the top of the second extraction tube (2). A support spring (310) is fixedly connected between the sliding ring (303) and the annular groove. The lower end of the sliding ring (303) is located in the groove (304). The sliding ring (303) is fixedly connected to the connecting rod (305).

3. The gas emission early warning and drainage device for underground coal mines according to claim 2, characterized in that: The connecting rod (305) can slide under the push of the sliding ring (303), the first magnetic sheet (307) attracts the first magnetic block (308) when it is close to it, and a transparent cover is fixedly connected to the outside of the groove (304), forming a sealed space between the transparent cover and the groove (304).

4. A gas emission early warning and drainage device for underground coal mines according to claim 1, characterized in that: The early warning mechanism also includes an observation ruler (309), which is fixedly connected to the groove (304).

5. A gas emission early warning and drainage device for underground coal mines according to claim 1, characterized in that: It also includes a limiting mechanism for fixing the mounting ring (301), the limiting mechanism including two sliding rods (401), both of which are slidably connected to the outer surface of the lower sliding ring (303), a return spring (402) is fixedly connected between the sliding rod (401) and the lower sliding ring (303), a pressure block (403) is fixedly connected to the side of the sliding rod (401) away from the return spring (402), a plug (404) is fixedly connected to the side of the sliding rod (401) away from the return spring (402), a fixing piece (405) is fixedly connected to the bottom of the mounting ring (301), and the plug (404) is inserted into the fixing piece (405).

6. A gas emission early warning and drainage device for underground coal mines according to claim 5, characterized in that: The pressure block (403) has an inclined surface on one side. When the pressure block (403) moves downward, the sliding rod (401) slides towards the return spring (402) due to the squeezing of the annular groove at the top of the second extraction tube (2).

7. A gas emission early warning and drainage device for underground coal mines according to claim 1, characterized in that: It also includes a cleaning mechanism for cleaning the top of the filter screen (302), the cleaning assembly including a support frame (501) fixedly connected to the inner surface of the first extraction tube (1), a rotating shaft (502) rotatably connected inside the support frame (501), a fan impeller (503) fixedly connected to the top of the rotating shaft (502), a sliding shaft (504) slidably connected to the bottom of the rotating shaft (502), and a cleaning wheel (505) fixedly connected to the bottom of the sliding shaft (504).

8. A gas emission early warning and drainage device for underground coal mines according to claim 7, characterized in that: Multiple guide bars are fixedly connected to the outer surface of the sliding shaft (504), and the multiple guide bars are slidably connected to the rotating shaft (502), so that the rotating shaft (502) can drive the sliding shaft (504) to rotate when it rotates, and the bottom of the cleaning wheel (505) is in contact with the filter screen (302).

9. A gas emission early warning and drainage device for underground coal mines according to claim 8, characterized in that: The cleaning mechanism also includes two connecting posts (506), both of which are slidably inserted into the top of the second extraction tube (2). The top of the connecting post (506) passes through the mounting ring (301), and the bottom of the connecting post (506) slides in the groove (304). A spring telescopic rod (507) is fixedly connected to one side of the groove (304). The lower end of the spring telescopic rod (507) is fixedly connected to the connecting post (506). A second magnetic sheet (508) is fixedly connected to the bottom of the connecting post (506). A second magnetic block (509) is fixedly connected to the bottom of the groove (304). A limit block is provided on the outer surface of the connecting post (506), and the top of the limit block contacts the bottom of the mounting ring (301).

10. A gas emission early warning and drainage device for underground coal mines according to claim 9, characterized in that: When the second magnetic sheet (508) approaches the second magnetic block (509), it can attract it. The connecting stop (506) passes through the mounting ring (301) and one end is located on the rotation trajectory of the cleaning wheel (505).

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