Goaf gas sampling device and method

Abstract

This application proposes a goaf gas sampling device and method. The goaf gas sampling device includes a gas observation pipe, which is used to pass through the sealing wall between the goaf and the roadway. An air sample bin retracting window and an air sample bin sampling window are provided on the gas observation pipe, and the air sample bin retracting window is located in the roadway, and the air sample bin sampling window is located in the goaf; an air sample bin module, which is used to be arranged in the gas observation pipe and move between the air sample bin retracting window and the air sample bin sampling window; a sealing baffle, which is used to seal and isolate the air sample bin retracting window and the air sample bin sampling window. This goaf gas sampling device has accurate sampling and high efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine fire extinguishing, and particularly relates to a gob gas sampling device and method. Background Art

[0002] Spontaneous combustion in the gob of a coal mine is a serious event that can affect the entire mine and cause serious personal injuries and economic losses. In order to timely observe and master the occurrence of fires in the gob of a coal mine, one of the most important tasks is the gas observation and analysis in the gob of the coal mine. Whether the gas in the gob can be accurately collected is the key to the accuracy of the prediction and forecast of spontaneous combustion in the coal mine.

[0003] Currently, sampling is mainly carried out by cooperating a suction pump and an airbag. However, for coal mines with positive pressure ventilation or a large pressure difference between the inside and outside of the gob seal, there are problems such as inability to collect gas samples, inaccurate gas samples, and long pumping time when using a suction pump for sampling. The direct result is inaccurate gas samples and low efficiency. Summary of the Invention

[0004] In view of some or all of the above technical problems existing in the prior art, the present invention provides a gob gas sampling device and method. The gob gas sampling device can improve the accuracy of gas samples and the sampling efficiency.

[0005] According to one aspect of the present invention, there is provided a gob gas sampling device, including:

[0006] A gas observation pipe, which is used to pass through the sealing wall between the gob and the roadway. A gas sample bin retracting and releasing window and a gas sample bin sampling window are provided on the gas observation pipe, and the gas sample bin retracting and releasing window is located in the roadway, and the gas sample bin sampling window is located in the gob.

[0007] A gas sample bin module, which is used to be arranged in the gas observation pipe and move between the gas sample bin retracting and releasing window and the gas sample bin sampling window.

[0008] A sealing baffle, which is used to hermetically isolate the gas sample bin retracting and releasing window and the gas sample bin sampling window.

[0009] In one embodiment, a linear guide rail is arranged in the gas observation pipe. The gas sample bin module is installed on the linear guide rail, and a driving structure is in transmission connection with the linear guide rail for driving the gas sample bin module to reciprocate between the gas sample bin retracting and releasing window and the gas sample bin sampling window.

[0010] In one embodiment, a lead screw-nut pair is formed between the linear guide rail and the gas sample bin module, and the driving structure is a rotating handwheel, and the rotating handwheel is fixedly connected to the linear guide rail for driving the linear guide rail to rotate.

[0011] In one embodiment, the sealing baffle includes a first baffle and a second baffle. The first baffle and the second baffle are respectively located at two ends of the gas sample chamber module and are relatively stationary with respect to the gas sample chamber module.

[0012] In one embodiment, the gas sample chamber module includes:

[0013] A gas sample chamber body having a cavity, an air inlet and a sampling hole communicating with the cavity.

[0014] A sealing plate disposed at the air inlet for opening or closing the air inlet.

[0015] A sealing plug disposed at the sampling hole for opening or closing the sampling hole.

[0016] In one embodiment, a gas sample piston is slidably engaged with the inner wall of the cavity, and the gas sample piston is used to change the volume of the cavity.

[0017] In one embodiment, a torsion spring is disposed between the sealing plate and the gas sample chamber body. The torsion spring is used to open the air inlet by the sealing plate. When the gas sample chamber body is located in the gas observation tube, the gas observation tube abuts against the sealing plate so that the sealing plate covers the air inlet.

[0018] In one embodiment, the gas sample chamber module further includes an airbag. The airbag can be installed on the sampling hole and is used to allow the gas in the cavity to enter the airbag through the sampling hole under the action of the gas sample piston when the sealing plate closes the air inlet.

[0019] In one embodiment, the gas sample chamber module further includes a push-pull rod connected to the gas sample piston for driving the gas sample piston to move.

[0020] According to another aspect of the present invention, there is provided a method for sampling gob gas by using the above device, including the following steps:

[0021] S100. Install the gas observation tube so that the gas sample chamber retracting and releasing window is located in the roadway and the gas sample chamber sampling window is located in the gob. At this time, the gas sample chamber module is located at the gas sample chamber retracting and releasing window.

[0022] S200. Move the gas sample chamber module to the gas sample chamber sampling window.

[0023] S300. Operate the gas sample chamber module to collect the gas in the gob.

[0024] S400 moves the gas sample chamber module back to the gas sample chamber retraction window and collects the sampled gas from the gas sample chamber module.

[0025] Compared with the prior art, the advantages of the present invention are as follows: The gas sample chamber module moves between the gas sample chamber retraction window and the gas sample chamber sampling window to sample in the gob area and transports it to the gas sample chamber retraction window. During this process, the sealing baffle isolates the gas sample chamber retraction window and the gas sample chamber sampling window, making the sampled gas sample accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Structural schematic diagram of the gob gas sampling device according to the specific embodiment of the present invention;

[0028] Figure 2 For Figure 1 Structural schematic diagram of the gob gas sampling device in

[0029] Figure 3 For Figure 1 Schematic diagram when the gas sample chamber module in

[0030] Figure 4 For Figure 1 Schematic diagram when the gas sample chamber module moves to the sampling position in

[0031] Figure 5 For Figure 1 Structural schematic diagram of the gas sample chamber module in

[0032] Figure 6 For Figure 5 Schematic diagram when the gas sample chamber module samples a gas sample in

[0033] Figure 7 For Figure 6 Schematic diagram when the gas sample sampled by the gas sample chamber module in

[0034] Figure 8 For Figure 1 Schematic block diagram of the usage steps of the gob gas sampling device in

[0035] Figure 9 Flow schematic block diagram of the gob gas sampling method provided by the embodiment of the present invention.

[0036] Icons: 10 - roadway; 20 - goaf; 30 - airtight wall; 100 - goaf gas sampling device; 110 - gas observation pipe; 111 - gas sample bin retraction window; 112 - gas sample bin sampling window; 120 - gas sample bin module; 121 - gas sample bin body; 1211 - air inlet; 1212 - sampling hole; 122 - sealing plate; 123 - gas sample piston; 124 - sealing plug; 125 - airbag; 126 - push - pull rod; 130 - sealing baffle; 140 - linear guide rail; 150 - driving structure. Detailed implementation manners

[0037] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0040] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0042] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings.

[0043] Please refer to Figure 1 and Figure 2 , this embodiment provides a goaf gas sampling device 100, which can improve the accuracy of gas samples and the sampling efficiency.

[0044] In an embodiment of the present invention, the gob gas sampling device 100 is used to sample the gas in the gob 20. A sealed wall 30 is provided between the gob 20 and the roadway 10. The sealed wall 30 is used to isolate the roadway 10 and the gob 20. A hole for installing the gas sampling device 100 is opened on the sealed wall 30 for the gas sampling device 100 to pass through.

[0045] In this embodiment, the sampling device includes a gas observation tube 110, a gas sample chamber module 120, a sealing baffle 130, a linear guide rail 140, and a driving structure 150. The gas observation tube 110 is installed on the sealed wall 30 and extends from the roadway 10 to the gob 20. The gas observation tube 110 is provided with a gas sample chamber retracting window 111 and a gas sample chamber sampling window 112. And the gas sample chamber retracting window 111 is located in the roadway 10, and the gas sample chamber sampling window 112 is located in the gob 20. The linear guide rail 140 is installed inside the gas observation tube 110. The gas sample chamber module 120 is installed on the linear guide rail 140. The driving structure 150 is in transmission connection with the linear guide rail 140 and is used to drive the gas sample chamber module 120 to reciprocate between the gas sample chamber retracting window 111 and the gas sample chamber sampling window 112. The sealing baffle 130 is used to seal the gas sample chamber retracting window 111 when the gas sample chamber module 120 is located at the gas sample chamber retracting window 111, and is used to seal the gas sample chamber sampling window 112 when the gas sample chamber module 120 is located at the gas sample chamber sampling window 112. That is to say, no matter where the gas sample chamber module 120 is located, the sealing baffle 130 can isolate the gas sample chamber retracting window 111 from the gas sample chamber sampling window 112, thereby ensuring the accuracy of the gas sample during the sampling operation.

[0046] The installation method of the gas observation tube 110 on the sealed wall 30 may not be specifically limited, and the setting method of the gas sample chamber retracting window 111 and the gas sample chamber sampling window 112 may also not be required and limited. As Figure 1 shown, the length of the gas observation tube 110 on the side of the gob 20 is greater than its length on the side of the roadway 10. Of course, this is not the only case, and the specific length relationship depends on the installation position of the sealed wall 30. The driving method of the driving structure 150 can be manual or automatic. "The gas sample chamber module 120 reciprocates between the gas sample chamber retracting window 111 and the gas sample chamber sampling window 112" means that under the action of the driving structure 150, the gas sample chamber module 120 can move from the gas sample chamber retracting window 111 to the gas sample chamber sampling window 112 to complete the sampling of the gas in the gob 20, or can move from the gas sample chamber sampling window 112 to the gas sample chamber retracting window 111 to collect the sampled gas for detection by the measuring device; this process can be carried out once or multiple times.

[0047] In an alternative embodiment, gas sampling chambers access and sampling windows 111 and 112 are respectively formed on the side walls of the gas observation tube 110 near both ends. The cross-sectional shape of the gas observation tube 110 is as shown in the figure, and its specific shape can be a cuboid, a cylinder, or an irregular body, etc., and the present invention does not make any requirements or limitations in this regard.

[0048] Furthermore, the length of the gas observation tube 110 within the gob area 20 is greater than its length within the roadway 10.

[0049] In an alternative embodiment, a lead screw-nut pair is formed between the linear guide 140 and the gas sampling chamber module 120, and the driving structure 150 is used to drive the linear guide 140 to rotate around the central axis of the linear guide 140.

[0050] Furthermore, the driving structure 150 is a rotating handwheel, which is fixedly connected to the linear guide 140 and is used to drive the linear guide 140 to rotate. The rotating handwheel can manually drive the gas sampling chamber module 120, thus facilitating adjustment and having good safety.

[0051] In an alternative embodiment, the sealing baffle 130 includes a first baffle and a second baffle. The first baffle and the second baffle are respectively located at both ends of the gas sampling chamber module 120 and remain relatively stationary with respect to the gas sampling chamber module 120. The first baffle is used to seal the gas sampling chambers access window 111, and the second baffle is used to seal the gas sampling chambers sampling window 112.

[0052] As Figure 3 shown, it shows a schematic structural diagram when the gas sampling chamber module 120 moves between the gas sampling chambers sampling window 112 and the gas sampling chambers access window 111. At this time, the sealing baffle 130 seals the gas sampling chambers sampling window 112 and the gas sampling chambers access window 111, keeping the gob area 20 and the roadway 10 sealed.

[0053] As Figure 4 shown, it shows a schematic structural diagram when the gas sampling chamber module 120 moves to the gas sampling chambers sampling window 112. At this time, the sealing baffle 130 can still seal the gas sampling chambers sampling window 112 and the gas sampling chambers access window 111, keeping the gob area 20 and the roadway 10 sealed. In Figure 4 this case, gas sampling can be achieved through the gas sampling chamber module 120.

[0054] Please refer to Figure 5 and Figure 6, in an optional embodiment, the gas sample chamber module 120 includes a gas sample chamber body 121, a sealing plate 122, a gas sample piston 123, and a sealing plug 124. The gas sample chamber body 121 has a cavity, an air inlet 1211 and a sampling hole 1212 communicating with the cavity. The sealing plate 122 is movably connected to the gas sample chamber body 121 and is used to open or close the air inlet 1211. The sealing plug 124 is arranged on the sampling hole 1212 and is used to open or close the sampling hole 1212. The gas sample piston 123 is slidably engaged with the inner wall of the cavity. The air inlet 1211 is used to allow the gas in the goaf 20 to enter the cavity.

[0055] Please refer to Figure 7 , further, the gas sample chamber module 120 may further include an airbag 125. The airbag 125 can be installed on the sampling hole 1212 and is used to allow the gas in the cavity to enter the airbag 125 through the sampling hole 1212 under the action of the gas sample piston 123 when the sealing plate 122 closes the air inlet 1211. That is, the sampled gas is collected through the airbag 125.

[0056] Further, a torsion spring is arranged between the sealing plate 122 and the gas sample chamber body 121, and the torsion spring is used to move the sealing plate 122 away from the air inlet 1211 to open the air inlet 1211.

[0057] Further, the gas sample chamber module 120 further includes a push-pull rod 126, and the push-pull rod 126 is connected to the gas sample piston 123 and is used to drive the gas sample piston 123 to move.

[0058] Optionally, the sampling hole 121^ is opposite to the vertical surface of the gas sample piston 123, and the central axis of the sampling hole 1212 is coaxial with the central axis of the cavity.

[0059] For the gas sample chamber module 120, please refer to Figure 5 , when the sealing plate 122 opens the air inlet 1211, the gas in the goaf 20 enters the cavity of the gas sample chamber body 121, and then the sealing plate 122 is closed ( Figure 6 ), and the gas in the gas sample chamber body 121 is the gas collected in the goaf 20. Driven by the linear track, the gas sample chamber module 120 returns to one side of the roadway 10, the sealing plug 124 can be opened, and the airbag 125 can be sleeved on the sampling hole 1212 ( Figure 7 ), and under the action of the gas sample piston 123, the sampled gas is squeezed into the airbag 125, thereby realizing the collection of the gas sample.

[0060] Please refer to Figure 8, the gob area 20 sampling device in this embodiment mainly solves the problems of inaccurate sampling and low efficiency in the current gob area 20. It provides an accurate and rapid sampling scheme and device for the gob area 20. When constructing the airtight wall 3030 to isolate the gob area 20 from the roadway 10, a gas observation pipe 110 is installed on the airtight wall. A linear guide rail 140, a handwheel, a gas sample chamber retracting window 111, a gas sample chamber sampling window 112, and a sealing baffle 130 are installed inside the gas observation pipe 110. The gas sample chamber is installed on the linear guide rail 140 through the gas sample chamber retracting window 111. Close the gas sample chamber sealing plate 122 and turn the handwheel to move the gas sample chamber from the gas sample chamber retracting window 111 to the gas sample chamber sampling window 112. After the gas sample chamber is shaken to the gas sample chamber sampling window 112, the gas sample chamber sealing plate 122 automatically pops up under the action of the torsion spring, realizing the free diffusion of the gas in the gas sample chamber body 121 and the gob area 20, and completing the gas sampling. After the sampling is completed, turn the handwheel to move the gas sample chamber body 121 from the gas sample chamber sampling window 112 to the gas sample chamber retracting window 111. When the gas sample chamber body 121 enters the cavity of the gas sample chamber body 121 from the gas sample chamber sampling window 112, under the action of the gas observation pipe 110, the sealing plate 122 is closed to the air inlet 1211 to ensure the airtightness of the gas sample chamber body 121. During the movement of the gas sample chamber body 121, the wall of the gas observation pipe 110 abuts against the sealing plate 122 to ensure the airtightness of the air inlet 1211. Until the gas sample chamber body 121 reaches the gas sample chamber retracting window 111. At this time, it should be noted that the airtightness of the air inlet 1211 can still be ensured by manually pressing the sealing plate 122. During the movement of the gas sample chamber module 120, one of the two sealing baffles 130 is always inside the gas observation pipe 110 to ensure that the gas does not flow between the gob area 20 and the roadway 10.

[0061] For example, a slider - rail structure can also be set between the sealing plate 122 and the wall of the gas observation pipe 110. On the one hand, it is used to ensure the sealing of the sealing plate 122, and on the other hand, it ensures the smooth movement of the gas sample chamber body 121 in the gas observation pipe 110. Further, the slider - rail structure can also be configured as rolling friction, which can reduce the frictional force compared with sliding friction and further ensure the smooth movement of the gas sample chamber body 121 in the gas observation pipe 110.

[0062] Please refer to Figure 9 , the embodiment of the present invention also provides a method for sampling gob area 20 gas. Using the gob area gas sampling device 100 of any one of the foregoing, the sampling method includes:

[0063] Step S100: Install the gas observation pipe 110 so that the gas sample chamber retracting window 111 is located in the roadway 10 and the gas sample chamber sampling window 112 is located in the gob area 20. At this time, the gas sample chamber module 120 is located at the gas sample chamber retracting window 111, and the sealing baffle 130 forms a seal at the gas sample chamber retracting window 111.

[0064] Step S200: The gas sample chamber module 120 moves within the gas observation tube 110 until the gas sample chamber module 120 reaches the gas sample chamber sampling window 112. At this time, the sealing baffle 130 can still form a seal between the goaf 20 and the roadway 10.

[0065] Step S300: Operate the gas sample chamber module 120 to collect the gas in the goaf 20.

[0066] Optionally, in the embodiment of the present invention, step S300 may include the following sub-steps.

[0067] Sub-step S310: Under the action of the torsion spring, the sealing plate 122 opens, enabling the air inlet 1211 to communicate with the goaf 20. As a result, the gas in the goaf 20 enters the chamber of the gas sample chamber body 121 through the air inlet 1211.

[0068] Sub-step S320: The air inlet 1211 is in communication with the goaf 20 for a preset time. This preset communication time allows the gas in the sampling area to fully enter the chamber of the gas sample chamber body 121.

[0069] Step S400: Move the gas sample chamber module 120 back to the gas sample chamber retracting and deploying window 111, and collect the gas collected from the gas sample chamber module 120.

[0070] Optionally, in the embodiment of the present invention, step S400 may include the following sub-steps.

[0071] Sub-step S410: Under the action of the driving structure 150, the gas sample chamber module 120 slides along the linear track. Initially, the gas observation tube 110 acts on the sealing plate 122, causing the sealing plate to reseal the air inlet 1211, ensuring that the gas composition in the gas sample chamber body 121 is basically the same as that in the goaf 20. Position the gas sample chamber module 120 at the gas sample chamber retracting and deploying window 111. At this time, the sealing plate 122 can rely on an external force, such as manual pressure, against the air inlet 1211. Meanwhile, the sealing baffle 130 forms a seal at the gas sample chamber retracting and deploying window 111, blocking the communication between the goaf 20 and the roadway 10.

[0072] Sub-step S420: Put the airbag 125 over the sampling hole 1212, and push the gas sample piston 123 to squeeze the gas in the gas sample chamber body 121 into the airbag 125, thereby achieving the sampling of the gas in the goaf 20.

[0073] When collecting the gas, a push-pull rod 126 is installed on the gas sample piston, and an airbag 125 is installed on the gas sample collection hole. Push the push-pull rod 126 to move the gas sample piston 123 to push the gas in the gas sample chamber into the airbag 125, completing the gas sample collection work.

[0074] The gob gas sampling device 100 and its sampling method provided by the embodiments of the present invention can conveniently sample the gas in the gob 20, and the collected gas samples are accurate; that is, the accuracy and efficiency of the collected gas samples can be improved.

[0075] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is 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 should not be construed as a limitation to the present invention.

[0076] In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0077] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, terms such as "set" and "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the claims.

Claims

1. A gob gas sampling device, characterized in that, Comprising: A gas observation tube, which is used to pass through the sealing wall between the goaf and the roadway. An air sample bin retracting window and an air sample bin sampling window are provided on the gas observation tube. The air sample bin retracting window is located in the roadway, and the air sample bin sampling window is located in the goaf. An air sample bin module, which is used to be arranged in the gas observation tube and move between the air sample bin retracting window and the air sample bin sampling window. The air sample bin module includes an air sample bin body, and the air sample bin body has a cavity, an air inlet and a sampling hole communicating with the cavity. A sealing baffle, which is used to seal and isolate the air sample bin retracting window and the air sample bin sampling window.

2. The gob gas sampling device according to claim 1, characterized in that, A linear guide rail is arranged in the gas observation tube. The air sample bin module is installed on the linear guide rail, and a driving structure is in transmission connection with the linear guide rail, and is used to drive the air sample bin module to reciprocate between the air sample bin retracting window and the air sample bin sampling window.

3. The goaf gas sampling device according to claim 2, wherein, A lead screw-nut pair is formed between the linear guide rail and the air sample bin module, and the driving structure is a rotating handwheel, and the rotating handwheel is fixedly connected with the linear guide rail and is used to drive the linear guide rail to rotate.

4. The goaf gas sampling device according to claim 1, characterized in that, The sealing baffle includes a first baffle and a second baffle, and the first baffle and the second baffle are respectively located at both ends of the air sample bin module and remain relatively stationary with the air sample bin module.

5. The gob gas sampling device according to any one of claims 1 to 4, characterized in that, The air sample bin module further includes: A sealing plate arranged at the air inlet, and the sealing plate is used to open or close the air inlet. A sealing plug arranged at the sampling hole, and the sealing plug is used to open or close the sampling hole.

6. The gob gas sampling device according to claim 5, wherein An air sample piston is slidably matched with the inner wall of the cavity, and the air sample piston is used to change the volume of the cavity.

7. The gob gas sampling device according to claim 5, characterized in that, A torsion spring is arranged between the sealing plate and the air sample bin body, and the torsion spring is used to make the sealing plate open the air inlet. When the air sample bin body is located in the gas observation tube, the gas observation tube abuts against the sealing plate so that the sealing plate covers the air inlet.

8. The goaf gas sampling device according to claim 6, characterized in that, The air sample bin module further includes an airbag, and the airbag can be installed on the sampling hole and is used to enable the gas in the cavity to enter the airbag through the sampling hole under the action of the air sample piston when the sealing plate closes the air inlet.

9. The gob gas sampling device according to claim 6, characterized in that, The air sample bin module further includes a push-pull rod, and the push-pull rod is connected with the air sample piston and is used to drive the air sample piston to move.

10. A method for gas sampling in a gob area using the gob area gas sampling device according to any one of claims 1 to 9, characterized in that, Including the following steps: S100, install the gas observation tube so that the air sample bin retracting window is located in the roadway and the air sample bin sampling window is located in the goaf. At this time, the air sample bin module is located at the air sample bin retracting window. S200, move the air sample bin module to the air sample bin sampling window. S300, operate the air sample bin module to enable the air sample bin module to collect the gas in the goaf. S400, move the air sample bin module back to the air sample bin retracting window and collect the collected gas from the air sample bin module.

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