Coal mine gas extraction concentration monitoring and early warning device and method

Abstract

The invention is suitable for the technical field of gas concentration monitoring, and provides a coal mine gas extraction concentration monitoring and early warning device and method.The coal mine gas extraction concentration monitoring and early warning device comprises a gas concentration sensor body used for monitoring gas concentration; the mounting frame is arranged on one side of the gas concentration sensor body; the first electric telescopic rod is arranged on the mounting frame, a mounting plate is fixedly mounted on an output shaft of the first electric telescopic rod, and the mounting plate is fixedly connected with the gas concentration sensor body; and the adjusting mechanism is assembled on the mounting frame and the first electric telescopic rod and is used for adjusting the use position of the gas concentration sensor body. According to the coal mine gas extraction concentration monitoring and early warning device, the gas concentration can be monitored, the monitoring position can be adjusted, the monitoring range is large, the actual use requirement is better met, and the operation safety is improved.

Description

Technical Field

[0001] This invention relates to the field of gas concentration monitoring technology, and in particular to a device and method for monitoring and early warning of gas extraction concentration in coal mines. Background Technology

[0002] During the mining and construction process in coal mines, some gas is often generated. When the gas concentration reaches a certain value, it will pose a danger. In order to ensure the safety of the overall operation, it is necessary to use appropriate gas concentration monitoring and early warning devices.

[0003] Gas concentration can be monitored by gas concentration sensors installed on gas concentration monitoring and early warning devices. However, the gas concentration monitoring sensors on some existing gas concentration monitoring and early warning devices are used in relatively fixed positions, which cannot be flexibly adjusted. The monitoring range is small, and the use is relatively limited, which cannot better meet the actual use needs. Summary of the Invention

[0004] To address the technical problem mentioned in the background section that the gas concentration monitoring sensors in some existing gas concentration monitoring and early warning devices have relatively fixed locations and small monitoring ranges, this invention provides a coal mine gas extraction concentration monitoring and early warning device and method.

[0005] The coal mine gas extraction concentration monitoring and early warning device provided by the present invention includes: a gas concentration sensor body for monitoring gas concentration; a mounting frame disposed on one side of the gas concentration sensor body; a first electric telescopic rod disposed on the mounting frame, wherein a mounting plate is fixedly mounted on the output shaft of the first electric telescopic rod, and the mounting plate and the gas concentration sensor body are fixedly connected; and an adjustment mechanism assembled on the mounting frame and the first electric telescopic rod, wherein the adjustment mechanism is used to adjust the usage position of the gas concentration sensor body.

[0006] Preferably, the adjustment mechanism includes: a mounting shell disposed on the mounting bracket, on which a first servo motor is fixedly mounted; a mounting shaft rotatably mounted on the mounting shell, one end of which is fixedly connected to the first electric telescopic rod, and the output shaft of the first servo motor is connected to the other end of the mounting shaft via a coupling; a lifting mechanism assembled on the mounting bracket and the mounting shell, the lifting mechanism being used to adjust the working height of the gas concentration sensor body; and a rotating mechanism assembled on the mounting bracket, the rotating mechanism being used to drive the gas concentration sensor body to rotate.

[0007] Preferably, the lifting mechanism includes: a second servo motor fixedly mounted on the mounting frame; a connecting shaft rotatably mounted on the mounting frame, wherein the output shaft of the second servo motor is connected to one end of the connecting shaft via a coupling; a winch fixedly sleeved on the connecting shaft, wherein a pull rope is wound on the winch; and a connecting plate fixedly mounted on the mounting housing, wherein the connecting plate and the pull rope are fixedly connected.

[0008] Preferably, the rotating mechanism includes: a base disposed below the mounting bracket, on which a third servo motor is fixedly mounted; and a placement shaft rotatably mounted on the base, wherein the output shaft of the third servo motor is connected to the bottom end of the placement shaft via a coupling, and the top end of the placement shaft is fixedly connected to the bottom of the mounting bracket.

[0009] Preferably, a guide rod is fixedly installed on the mounting frame, the guide rod is slidably connected to the connecting plate, and the guide rod is used to guide the movement of the connecting plate. A guide wheel is provided on the mounting frame, the guide wheel is adapted to be connected to the pull rope, and the guide wheel is used to guide the movement of the pull rope. A plurality of sliders are fixedly installed at the bottom of the mounting frame, and a ball is nested at the bottom of each slider. The ball is in contact with the top of the base.

[0010] Preferably, the base is provided with a cleaning mechanism for cleaning dust adhering to the surface of the gas concentration sensor body. The cleaning mechanism includes: a cleaning hopper provided on the base, a connecting pipe provided at the bottom of the cleaning hopper, and the connecting pipe being fixedly connected to the base; a collection box mounted on the base, the collection box being connected to the connecting pipe, a filter bag being provided inside the collection box for collecting dust adhering to the surface of the gas concentration sensor body; and a fan mounted on one side of the collection box, the air inlet of the fan being connected to the collection box, and the air outlet of the fan extending to the outside of the base.

[0011] Preferably, the cleaning hopper is provided with a sealing mechanism, which is used to seal the top opening of the cleaning hopper. The sealing mechanism includes: a second electric telescopic rod fixedly installed on one side of the outer wall of the cleaning hopper, and a connecting frame fixedly installed on the output shaft of the second electric telescopic rod; and a baffle slidably installed on the cleaning hopper, the baffle and the connecting frame being fixedly connected, the baffle being used to block the top opening of the cleaning hopper.

[0012] Preferably, a sliding rod is fixedly installed on the outer wall of the cleaning bucket, and a guide block is fixedly installed on the baffle, with the guide block and the sliding rod slidably connected.

[0013] This invention also proposes a method for monitoring and early warning of coal mine gas extraction concentration, comprising the following steps: S1: The gas concentration in the device space can be monitored by the gas concentration sensor body. When the gas concentration exceeds a certain value, the gas concentration sensor body will issue an alarm in a timely manner; S2: During the process of using the gas concentration sensor body for gas concentration monitoring, the height and direction of the gas concentration sensor body can be adjusted by the adjustment mechanism, so that the gas concentration sensor body can monitor the gas concentration at different locations, effectively increasing the overall monitoring range of gas concentration, and thus timely detecting abnormalities.

[0014] Compared with related technologies, the coal mine gas extraction concentration monitoring and early warning device and method provided by the present invention have the following beneficial effects: This invention provides a coal mine gas extraction concentration monitoring and early warning device that can monitor gas concentration, adjust the monitoring location, and has a large monitoring range, better meeting actual use needs and improving operational safety. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of a preferred embodiment of the coal mine gas extraction concentration monitoring and early warning device provided by the present invention. Figure 2 This is a schematic diagram of the front sectional view of the present invention; Figure 3 for Figure 2 An enlarged structural diagram of part A shown in the figure; Figure 4 for Figure 3 An enlarged structural diagram of part B shown in the figure; Figure 5 for Figure 2 An enlarged structural diagram of section C shown in the figure; Figure 6 This is a schematic diagram of the cleaning bucket in this invention.

[0016] The following components are labeled in the diagram: 1. Gas concentration sensor body; 2. Mounting bracket; 3. First electric telescopic rod; 4. Mounting plate; 5. Mounting shell; 6. First servo motor; 7. Mounting shaft; 8. Second servo motor; 9. Connecting shaft; 10. Winch; 11. Pull rope; 12. Connecting plate; 13. Guide rod; 14. Guide wheel; 15. Base; 16. Third servo motor; 1601. Placement shaft; 17. Slider; 18. Cleaning hopper; 19. Collection box; 20. Filter bag; 21. Fan; 22. Connecting pipe; 23. Second electric telescopic rod; 24. Connecting bracket; 25. Baffle; 26. Guide block; 27. Slide rod. Detailed Implementation

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification and the foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification or the foregoing drawings of this application are used to distinguish different objects, not to describe a particular order; the terms "inner," "outer," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] This invention provides a coal mine gas extraction concentration monitoring and early warning device and method, such as... Figure 1-6 As shown, the coal mine gas extraction concentration monitoring and early warning device includes: a gas concentration sensor body 1 for monitoring gas concentration; a mounting frame 2 disposed on one side of the gas concentration sensor body 1; a first electric telescopic rod 3 disposed on the mounting frame 2, a mounting plate 4 fixedly mounted on the output shaft of the first electric telescopic rod 3, the mounting plate 4 and the gas concentration sensor body 1 being fixedly connected; and an adjustment mechanism assembled on the mounting frame 2 and the first electric telescopic rod 3, the adjustment mechanism being used to adjust the usage position of the gas concentration sensor body 1.

[0020] In this embodiment, the entire device is equipped with an explosion-proof controller of model KJJ660. The controller can control the entire device. The working principle of the controller is existing technology and will not be elaborated here. During use, the entire device is installed in the corresponding position. The explosion-proof gas concentration sensor body 1 of model MIPEX-03 can monitor the gas concentration. When the explosion-proof gas concentration sensor body 1 detects an abnormal gas concentration, it will issue an alarm in time. At the same time, during use, the controller can activate the adjustment mechanism, which can adjust the height and direction of the gas concentration sensor body 1, effectively increasing the monitoring range of the gas concentration sensor body 1 and timely detecting abnormalities. When adjusting the direction of the gas concentration sensor body 1, the explosion-proof first electric telescopic rod 3 can adjust the lateral position of the gas concentration sensor body 1, further increasing the monitoring range, better meeting the actual use needs, and improving operational safety. The entire device can monitor the gas concentration and adjust the monitoring position, with a large monitoring range, better meeting the actual use needs and improving operational safety.

[0021] In a further preferred embodiment of the present invention, the adjustment mechanism includes: a mounting shell 5 disposed on the mounting frame 2, on which a first servo motor 6 is fixedly mounted; a mounting shaft 7 rotatably mounted on the mounting shell 5, one end of the mounting shaft 7 being fixedly connected to the first electric telescopic rod 3, and the output shaft of the first servo motor 6 being connected to the other end of the mounting shaft 7 via a coupling; a lifting mechanism assembled on the mounting frame 2 and the mounting shell 5, the lifting mechanism being used to adjust the working height of the gas concentration sensor body 1; and a rotating mechanism assembled on the mounting frame 2, the rotating mechanism being used to drive the gas concentration sensor body 1 to rotate.

[0022] In this embodiment, when the position of the gas concentration sensor body 1 needs to be adjusted, the controller activates the lifting mechanism to move the mounting shell 5 and the first electric telescopic rod 3 up and down, thereby adjusting the height of the gas concentration sensor body 1. The rotating mechanism drives the mounting frame 2 to rotate, thereby adjusting the orientation of the gas concentration sensor body 1. Simultaneously, when adjusting the orientation of the gas concentration sensor body 1, the controller activates the explosion-proof first servo motor 6, which drives the mounting shaft 7 to rotate, thereby driving the first electric telescopic rod 3 and the gas concentration sensor body 1 connected to it to rotate, adjusting the first electric telescopic rod 3 to a position parallel to the ground. Then, the controller activates the first electric telescopic rod 3 to move the gas concentration sensor body 1 laterally, further increasing the monitoring range, better meeting actual usage needs, and improving operational safety.

[0023] In a further preferred embodiment of the present invention, the lifting mechanism includes: a second servo motor 8 fixedly mounted on the mounting frame 2; a connecting shaft 9 rotatably mounted on the mounting frame 2, wherein the output shaft of the second servo motor 8 is connected to one end of the connecting shaft 9 via a coupling; a winch 10 fixedly sleeved on the connecting shaft 9, wherein a pull rope 11 is wound on the winch 10; and a connecting plate 12 fixedly mounted on the mounting housing 5, wherein the connecting plate 12 and the pull rope 11 are fixedly connected.

[0024] In this embodiment, when using the lifting mechanism, the explosion-proof second servo motor 8 is started by the controller. The output shaft of the second servo motor 8 drives the connecting shaft 9 to rotate through the coupling. As the connecting shaft 9 rotates, the winch 10 rotates accordingly, and the pull rope 11 is wound up and down accordingly. The pull rope 11 drives the connecting plate 12 and the mounting shell 5 to move up and down, thereby realizing the adjustment of the height of the gas concentration sensor body 1, increasing the monitoring range of the gas concentration sensor body 1, better meeting the actual use needs, and improving the safety of operation.

[0025] In a further preferred embodiment of the present invention, the rotating mechanism includes: a base 15 disposed below the mounting bracket 2, on which a third servo motor 16 is fixedly mounted; a placement shaft 1601 rotatably mounted on the base 15, wherein the output shaft of the third servo motor 16 is connected to the bottom end of the placement shaft 1601 via a coupling, and the top end of the placement shaft 1601 is fixedly connected to the bottom of the mounting bracket 2.

[0026] In this embodiment, when using the rotating mechanism, the third servo motor 16 is started by the controller. The output shaft of the third servo motor 16 drives the placement shaft 1601 to rotate through the coupling. When the placement shaft 1601 rotates, it will directly drive the mounting bracket 2 to rotate synchronously, thereby driving the gas concentration sensor body 1 to rotate. This will adjust the monitoring direction of the gas concentration sensor body 1, increase the monitoring range of the gas concentration sensor body 1, better meet the actual use needs, and improve the safety of operation.

[0027] In a further preferred embodiment of the present invention, a guide rod 13 is fixedly installed on the mounting frame 2, the guide rod 13 is slidably connected to the connecting plate 12, the guide rod 13 is used to guide the movement of the connecting plate 12, a guide wheel 14 is provided on the mounting frame 2, the guide wheel 14 is adapted to the pull rope 11, the guide wheel 14 is used to guide the movement of the pull rope 11, and a plurality of sliders 17 are fixedly installed at the bottom of the mounting frame 2, and a ball is nested at the bottom of each of the plurality of sliders 17, the ball being in contact with the top of the base 15.

[0028] In this embodiment, when the lifting mechanism drives the connecting plate 12 to move up and down to adjust the height of the gas concentration sensor body 1, the guide rod 13 can provide precise guidance for the movement of the connecting plate 12, so that the connecting plate 12 can only move in a straight line along the axis of the guide rod 13, avoiding deviation or shaking during the movement, ensuring the smoothness and accuracy of the lifting action, thereby ensuring that the gas concentration sensor body 1 can accurately reach the predetermined height for monitoring. The guide wheel 14 can effectively guide the movement of the pull rope 11, so that the pull rope 11 moves along the predetermined path, reducing friction and interference between the pull rope 11 and other components, reducing wear on the pull rope 11, and ensuring the smoothness of the pull rope 11's retraction and extension action, thereby improving the stability and reliability of the lifting mechanism's height adjustment.

[0029] In a further preferred embodiment of the present invention, the base 15 is provided with a cleaning mechanism for cleaning dust adhering to the surface of the gas concentration sensor body 1. The cleaning mechanism includes: a cleaning hopper 18 disposed on the base 15, a connecting pipe 22 disposed at the bottom of the cleaning hopper 18, the connecting pipe 22 being fixedly connected to the base 15; a collection box 19 assembled on the base 15, the collection box 19 being connected to the connecting pipe 22, a filter bag 20 disposed inside the collection box 19, the filter bag 20 being used to collect dust adhering to the surface of the gas concentration sensor body 1; and a fan 21 assembled on one side of the collection box 19, the air inlet of the fan 21 being connected to the collection box 19, and the air outlet of the fan 21 extending to the outside of the base 15.

[0030] In this embodiment, when it is necessary to clean the dust adhering to the surface of the gas concentration sensor body 1, the controller first activates the sealing mechanism to disengage the seal on the top of the cleaning hopper 18. First, the controller activates the explosion-proof first servo motor 6 to drive the mounting shaft 7 to rotate, thereby adjusting the gas concentration sensor body 1 to a downward position. Then, the controller activates the lifting mechanism to move the gas concentration sensor body 1 downwards. Next, the controller activates the first electric telescopic rod 3 to move the mounting plate 4 and the gas concentration sensor body 1 downwards into the cleaning hopper 18. At this point, the mounting plate 4 contacts the top of the cleaning hopper 18 and seals it. Figure 3As shown, the explosion-proof fan 21 is then started by the controller. After the fan 21 starts, it will create a negative pressure in the collection box 19, which will cause the air in the cleaning hopper 18 to flow. The dust on the surface of the gas concentration sensor body 1 will enter the collection box 19 through the connecting pipe 22. Finally, the clean air filtered by the filter bag 20 will be discharged from the air outlet of the fan 21 to the outside of the base 15, thereby cleaning the surface of the gas concentration sensor body 1 and reducing the impact of dust on the gas concentration sensor body 1. After cleaning, the steps above are reversed to remove the gas concentration sensor body 1 from the cleaning hopper 18 for use.

[0031] In a further preferred embodiment of the present invention, a sealing mechanism is provided on the cleaning hopper 18. The sealing mechanism is used to seal the top opening of the cleaning hopper 18. The sealing mechanism includes: a second electric telescopic rod 23 fixedly installed on one side of the outer wall of the cleaning hopper 18, and a connecting frame 24 fixedly installed on the output shaft of the second electric telescopic rod 23; and a baffle 25 slidably installed on the cleaning hopper 18. The baffle 25 and the connecting frame 24 are fixedly connected, and the baffle 25 is used to block the top opening of the cleaning hopper 18.

[0032] In this embodiment, when it is necessary to clean the dust adhering to the surface of the gas concentration sensor body 1, the controller first activates the sealing mechanism to disengage the seal on the top of the cleaning hopper 18. The controller then activates the explosion-proof second electric telescopic rod 23, connecting frame 24, and baffle 25 to move, opening the top opening of the cleaning hopper 18 so that the gas concentration sensor body 1 can be inserted into the cleaning hopper 18. After the surface of the gas concentration sensor body 1 is cleaned and the gas concentration sensor body 1 is removed from the cleaning hopper 18, the controller activates the second electric telescopic rod 23 to push the connecting frame 24 and baffle 25 to move, sealing the top opening of the cleaning hopper 18, effectively preventing external dust, debris, etc. from entering the interior of the cleaning hopper 18.

[0033] In a further preferred embodiment of the present invention, a sliding rod 27 is fixedly installed on the outer wall of the cleaning bucket 18, and a guide block 26 is fixedly installed on the baffle 25, wherein the guide block 26 and the sliding rod 27 are slidably connected.

[0034] In this embodiment, the stability of the baffle 25 during movement can be improved by using the slide bar 27 and the guide block 26.

[0035] The present invention also proposes a method for monitoring and early warning of coal mine gas extraction concentration, including the following steps: S1: The gas concentration in the device space can be monitored by the gas concentration sensor body 1. When the gas concentration is detected to exceed a certain value, the gas concentration sensor body 1 will issue an alarm in time. S2: During the process of monitoring gas concentration using the gas concentration sensor body 1, the height and direction of the gas concentration sensor body 1 can be adjusted by the adjustment mechanism, so that the gas concentration sensor body 1 can monitor gas concentration at different locations, effectively increasing the overall range of gas concentration monitoring, and thus timely detecting abnormalities.

[0036] In summary, compared with related technologies, this device can monitor gas concentration, adjust the monitoring position, and has a large monitoring range, better meeting practical needs and improving operational safety.

[0037] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A coal mine gas extraction concentration monitoring and early warning device, characterized in that, include: Gas concentration sensor body used for monitoring gas concentration; A mounting bracket is installed on one side of the gas concentration sensor body; A first electric telescopic rod is mounted on the mounting frame, and a mounting plate is fixedly mounted on the output shaft of the first electric telescopic rod. The mounting plate is fixedly connected to the gas concentration sensor body. An adjustment mechanism is mounted on the mounting bracket and the first electric telescopic rod, the adjustment mechanism being used to adjust the usage position of the gas concentration sensor body.

2. The coal mine gas extraction concentration monitoring and early warning device according to claim 1, characterized in that, The adjustment mechanism includes: A mounting housing is provided on the mounting bracket, and a first servo motor is fixedly mounted on the mounting housing; A mounting shaft is rotatably mounted on the mounting housing. One end of the mounting shaft is fixedly connected to the first electric telescopic rod, and the output shaft of the first servo motor is connected to the other end of the mounting shaft via a coupling. A lifting mechanism is mounted on the mounting bracket and the mounting housing, the lifting mechanism being used to adjust the operating height of the gas concentration sensor body; A rotating mechanism mounted on the mounting bracket is used to drive the gas concentration sensor body to rotate.

3. The coal mine gas extraction concentration monitoring and early warning device according to claim 2, characterized in that, The lifting mechanism includes: A second servo motor is fixedly mounted on the mounting bracket; Rotate the connecting shaft mounted on the mounting bracket; the output shaft of the second servo motor is connected to one end of the connecting shaft via a coupling. A winch is fixedly sleeved on the connecting shaft, and a pull rope is wound on the winch; A connecting plate is fixedly installed on the mounting shell, and the connecting plate is fixedly connected to the pull rope.

4. The coal mine gas extraction concentration monitoring and early warning device according to claim 3, characterized in that, The rotating mechanism includes: A base is located below the mounting bracket, and a third servo motor is fixedly mounted on the base. The placement shaft mounted on the base is rotated, and the output shaft of the third servo motor is connected to the bottom end of the placement shaft via a coupling, and the top end of the placement shaft is fixedly connected to the bottom of the mounting bracket.

5. The coal mine gas extraction concentration monitoring and early warning device according to claim 4, characterized in that, A guide rod is fixedly installed on the mounting frame, and the guide rod is slidably connected to the connecting plate. The guide rod is used to guide the movement of the connecting plate. A guide wheel is provided on the mounting frame, and the guide wheel is adapted to be connected to the pull rope. The guide wheel is used to guide the movement of the pull rope. A plurality of sliders are fixedly installed at the bottom of the mounting frame, and a ball is nested at the bottom of each slider. The ball is in contact with the top of the base.

6. The coal mine gas extraction concentration monitoring and early warning device according to claim 4, characterized in that, The base is equipped with a cleaning mechanism for cleaning dust adhering to the surface of the gas concentration sensor body. The cleaning mechanism includes: A cleaning bucket is provided on the base, and a connecting pipe is provided at the bottom of the cleaning bucket. The connecting pipe is fixedly connected to the base. A collection box is mounted on the base, and the collection box is connected to the connecting pipe. A filter bag is provided inside the collection box, and the filter bag is used to collect the dust adhering to the surface of the gas concentration sensor body. A fan is mounted on one side of the collection box, the air inlet of the fan is connected to the collection box, and the air outlet of the fan extends to the outside of the base.

7. The coal mine gas extraction concentration monitoring and early warning device according to claim 6, characterized in that, The cleaning hopper is equipped with a sealing mechanism, which is used to seal the top opening of the cleaning hopper. The sealing mechanism includes: A second electric telescopic rod is fixedly installed on the outer wall of one side of the cleaning bucket, and a connecting frame is fixedly installed on the output shaft of the second electric telescopic rod; A baffle is slidably mounted on the cleaning bucket, and the baffle is fixedly connected to the connecting frame. The baffle is used to cover the top opening of the cleaning bucket.

8. The coal mine gas extraction concentration monitoring and early warning device according to claim 7, characterized in that, A sliding rod is fixedly installed on the outer wall of the cleaning bucket, and a guide block is fixedly installed on the baffle. The guide block and the sliding rod are slidably connected.

9. A method for monitoring and early warning of coal mine gas extraction concentration, characterized in that, The method is applicable to the coal mine gas extraction concentration monitoring and early warning device according to any one of claims 1-8. The method includes the following steps: S1: The gas concentration in the device space can be monitored by the gas concentration sensor body. When the gas concentration exceeds a certain value, the gas concentration sensor body will issue an alarm in time; S2: During the gas concentration monitoring process using the gas concentration sensor body, the height and direction of the gas concentration sensor body can be adjusted by the adjustment mechanism, so that the gas concentration sensor body can monitor the gas concentration at different locations, effectively increasing the overall gas concentration monitoring range, and thus timely detecting abnormalities.

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