Dynamic and accurate sampling device for multi-component gas in goaf

Abstract

The invention relates to the technical field of gas detection and sampling, and discloses a goaf multi-component gas dynamic accurate sampling device, a coal seam air inlet way and a coal seam air outlet way are respectively arranged above and below a goaf, the goaf multi-component gas dynamic accurate sampling device comprises a sampling device and a protection pipeline, and a gas sampling structure reciprocates in the protection pipeline. The protection pipeline comprises a connecting pipeline and a butt joint pipe fitting; a plurality of groups of air inlet pipes are arranged outside the butt joint pipe fitting, and self-cleaning structures capable of simultaneously pushing out for cleaning and flushing for cleaning are arranged inside the air inlet pipes. A corresponding gas sampling path is arranged, the gas sampling structure reciprocates in the protection pipeline, goaf gas is collected through the gas inlet holes of the gas inlet pipes, and multidirectional gas input is achieved through the multiple sets of gas inlet pipes distributed in the radial direction. According to the self-cleaning mechanism, the rotating frame drives the cleaning block to rotate, sundries blocking the air inlet hole are mechanically pushed out, meanwhile, spraying holes of the cleaning block spray water for flushing, and smoothness of the air inlet hole is guaranteed through double effects.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection and sampling, and in particular to a dynamic and precise sampling device for multi-component gas in a goaf. Background Art

[0002] Coal mine goafs are critical areas for mine disaster prevention and control. The concentrations of gases such as methane (CH4), carbon monoxide (CO), and carbon dioxide (CO2) accumulated within these areas fluctuate dynamically and in a complex manner, posing a direct threat to underground operations. Traditional gas sampling methods, which rely on fixed sensors or manual sampling at designated locations, suffer from various technical drawbacks.

[0003] The prior art discloses an intelligent dynamic circulation gas sampling and control system for spontaneous combustion of coal in goafs, with the announcement number CN114112558B. The system comprises two groups of gas sampling and control devices extending into the goaf along the extension direction of the coal seam air inlet tunnel and the coal seam return air tunnel, respectively. The gas sampling and control device comprises an intrinsically safe monitoring host, a gas sampling mechanism, a flushing mechanism, a nitrogen injection mechanism, and a steel pipe arranged along the length of the coal seam excavation. A sliding mechanism is provided in the steel pipe, and the sliding mechanism is connected to a No. 1 winch and a No. 2 winch at both ends. The design of this invention is novel and reasonable, and has strong practicality. By circulating the sliding mechanism in the steel pipe by the No. 1 winch and the No. 2 winch, the gas sampling mechanism is dynamically monitored in the goaf through the exhaust pipe, thereby improving the efficiency of spontaneous combustion prevention and control of coal in goafs. Furthermore, the nitrogen injection mechanism can be used to accurately inject nitrogen for prevention and control of fires in the coal spontaneous combustion warning risk area in the first time, which is convenient for promotion and use. However, the prior art, especially this solution, still has the following problems:

[0004] In this scheme, the air inlet is easily clogged, resulting in sampling interruption and affecting the sampling effect. The high concentration of dust and coal dust in the goaf is easy to clog the air inlet of the gas sampling device. Especially during long-term operation, there is a lack of effective cleaning mechanism, which leads to discontinuous sampling data and affects the real-time nature of coal spontaneous combustion warning. Summary of the Invention

[0005] The purpose of the present invention is to provide a technical solution, set up a corresponding sampling path, and provide a special gas sampling pipeline, and then equip it with a self-cleaning structure to solve the problems in the prior art raised in the above background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A dynamic precision sampling device for multi-component gas in a goaf, wherein a coal seam air inlet lane and a coal seam air outlet lane are respectively provided above and below the goaf, comprising: two sets of sampling devices extending into the goaf along the coal seam air inlet lane and the coal seam air outlet lane; the sampling devices include protective pipes arranged along the coal seam air inlet lane and the coal seam air outlet lane; a gas sampling structure reciprocates within the protective pipes; the protective pipes include connecting pipes and butting pipe fittings;

[0008] The outside of the docking pipe fitting is provided with multiple groups of air inlet pipes, and the air inlet pipes are provided with air inlet holes. The gas that needs to be sampled by the gas sampling structure enters the interior of the protective pipe through the air inlet holes; a rotating frame is provided inside the air inlet pipe, and a cleaning block is installed on the rotating frame. The rotating frame drives the cleaning block to clean the air inlet holes when it rotates inside the air inlet pipe. At the same time, a spray hole is provided on the cleaning block, and the spray hole is used to flush and clean the air inlet holes.

[0009] Preferably, a flushing pipe is further provided inside the protection pipe, a connecting pipe 1 connected to the flushing pipe is fixedly installed inside the air inlet pipe, a rotating rod is rotatably installed on the connecting pipe 1, and the rotating frame is installed on the rotating rod.

[0010] Preferably, the bottom of the rotating rod is connected to a spiral driving member, which is located inside the connecting pipe 1. When water circulates inside the connecting pipe 1, the spiral driving member drives the rotating rod to rotate.

[0011] Preferably, the side of the rotating rod is connected to multiple groups of connecting pipes 2, a cavity is provided inside the cleaning block, the connecting pipes 2 are connected to the cavity of the cleaning block, and the water inside the rotating rod enters the cleaning block through the connecting pipes 2.

[0012] Preferably, the bottom of the rotating rod is located inside the connecting tube one, a water inlet hole is provided at the bottom of the rotating rod, a water outlet hole is provided on the side of the rotating rod, and the connecting tube two is connected to the rotating rod through the water outlet hole. The water inside the connecting tube one enters the interior of the rotating rod through the water inlet hole, then enters the interior of the cleaning block through the connecting tube two, and is finally sprayed out through the spray hole.

[0013] Preferably, the two sides of the rotating frame are connected to a shell kit, and the cleaning block is slidably installed inside the shell kit. A telescopic spring for resetting the cleaning block is provided inside the shell kit. During the rotation of the rotating frame, the cleaning block is pushed into the air inlet, thereby pushing the debris at the air inlet out of the air intake pipe.

[0014] Preferably, the butt joint pipe is provided with an annular recessed groove, and the multiple groups of air intake pipes are located in the annular recessed groove. The multiple groups of air intake pipes are arranged outside the protective pipe in a radial annular array along the protective pipe.

[0015] Preferably, the protective pipe includes a plurality of groups of connecting pipes and butting pipe fittings that are butted against each other.

[0016] Preferably, piston plugs are provided at both ends of the gas sampling structure, and the gas sampling structure and the two sets of piston plugs slide simultaneously inside the protective pipe. The two sets of piston plugs form a sampling cavity inside the protective pipe for the gas sampling structure to perform multi-component gas sampling.

[0017] Preferably, the sampling device further comprises a winch, the traction rope of the winch is respectively connected to both ends of the gas sampling structure, and when the winch rotates in different directions, the gas sampling structure is moved in different directions inside the protective pipe.

[0018] Technical effects and advantages of the present invention: Compared with the prior art, the present invention provides a dynamic and precise sampling device for multi-component gas in goaf, which has the following advantages:

[0019] The present invention provides a corresponding gas sampling path. The gas sampling structure reciprocates within the protective pipe, collecting gas from the goaf through the air inlet holes of the air inlet pipe. Multiple radially distributed air inlet pipes enable multi-directional gas input. A self-cleaning mechanism: A rotating frame drives a cleaning block to mechanically push out debris blocking the air inlet hole. Simultaneously, the cleaning block's ejection hole sprays water for flushing, creating a dual effect that ensures the air inlet is unobstructed.

[0020] This system effectively addresses dust blockage issues by combining anti-clogging and continuous sampling, rotary cleaning, and hydraulic flushing, ensuring continuous and stable gas sampling. Multi-directional coverage, with multiple inlet pipes arranged in a circular pattern, expands the sampling area and improves the spatial representativeness of gas data. Furthermore, the segmented design of the protective pipe, including connecting pipes and butting fittings, facilitates underground deployment, while the concealed inlet pipe reduces the risk of mechanical damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the location of the goaf in coal seam mining operations;

[0022] Figure 2 Schematic diagram of the arrangement of the sampling device of the present invention;

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 4 It is a structural schematic diagram of the sampling device of the present invention;

[0025] Figure 5 It is a schematic diagram of the structures such as the winch and the protective pipe of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the butt joint fitting of the present invention;

[0027] Figure 7 It is a schematic diagram of the specific structure of the butt joint fitting of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the air intake pipe of the present invention;

[0029] Figure 9 For the present invention Figure 8Schematic diagram of the enlarged structure at B in the middle;

[0030] Figure 10 Schematic diagram of the structure of the rotating rod and the spiral driving member of the present invention;

[0031] Figure 11 For the present invention Figure 10 Schematic diagram of the enlarged structure at point C in the middle.

[0032] In the picture:

[0033] 11. Goaf; 12. Coal seam air inlet tunnel; 13. Coal seam air outlet tunnel; 14. Protective pipe; 15. Connecting pipe; 16. Butt fittings; 17. Sampling and monitoring host; 18. Communication tunnel; 19. Flushing pipe; 110. Signal transmission line; 111. Hoist; 112. Towing rope; 113. Piston plug; 114. Gas sampling structure;

[0034] 21. Recessed groove; 22. Air inlet pipe; 23. Air inlet hole; 24. Connecting pipe 1; 25. Rotating rod; 26. Rotating frame; 27. Shell kit; 28. Cleaning block; 29. ​​Spray hole; 210. Telescopic spring; 211. Connecting pipe 2; 212. Screw drive member; 213. Water outlet hole; 214. Water inlet hole. DETAILED DESCRIPTION

[0035] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. Furthermore, features described for some examples may be combined in other examples.

[0036] The invention provides Figures 1 to 11 As shown, a coal seam air inlet tunnel 12 and a coal seam air outlet tunnel 13 are respectively provided above and below the goaf 11, including: two sets of sampling devices extending into the goaf 11 along the coal seam air inlet tunnel 12 and the coal seam air outlet tunnel 13, the sampling devices including a protective pipe 14 arranged along the coal seam air inlet tunnel 12 and the coal seam air outlet tunnel 13, a gas sampling structure 114 reciprocatingly moving inside the protective pipe 14, and the protective pipe 14 including a connecting pipe 15 and a butt joint fitting 16;

[0037] A plurality of groups of air inlet pipes 22 are provided on the outside of the docking pipe 16, and an air inlet hole 23 is provided on the air inlet pipe 22. The gas to be sampled by the gas sampling structure 114 enters the interior of the protective pipe 14 through the air inlet hole 23; a rotating frame 26 is provided inside the air inlet pipe 22, and a cleaning block 28 is installed on the rotating frame 26. When the rotating frame 26 drives the cleaning block 28 to rotate inside the air inlet pipe 22, the air inlet hole 23 is cleaned. At the same time, a spray hole 29 is provided on the cleaning block 28, and the spray hole 29 is used to flush and clean the air inlet hole 23.

[0038] Working Principle: The gas sampling path and gas sampling structure 114 reciprocate within the protective pipe 14, collecting gas from the goaf 11 through the air inlet holes 23 of the air inlet pipe 22. Multiple radially distributed air inlet pipes 22 enable multi-directional gas input. A self-cleaning mechanism: The rotating frame 26 drives the cleaning block 28 to rotate, mechanically dislodging debris that blocks the air inlet hole 23. Simultaneously, the ejection hole 29 of the cleaning block 28 sprays water for flushing. This dual action ensures that the air inlet hole 23 is unobstructed.

[0039] Anti-clogging and continuous sampling, combining rotary cleaning with hydraulic flushing, effectively resolves dust blockage issues and ensures continuous and stable gas sampling. Multi-directional coverage, with multiple inlet pipes 22 arranged in a circular pattern, expands the sampling area and improves the spatial representativeness of gas data. Protection and flexibility are enhanced with the segmented design of the protective pipe 14, including connecting pipes 15 and butting fittings 16, facilitating underground deployment. Concealed inlet pipes 22 reduce the risk of mechanical damage.

[0040] A flushing pipe 19 is further provided inside the protection pipe 14 , and a connecting pipe 24 connected to the flushing pipe 19 is fixedly installed inside the air inlet pipe 22 , a rotating rod 25 is rotatably installed on the connecting pipe 24 , and a rotating frame 26 is installed on the rotating rod 25 .

[0041] Regarding the driving method of the rotating frame 26 on the rotating rod 25, it can be driven by a motor or other driver, and other embodiments are also possible. The bottom of the rotating rod 25 is connected to a spiral drive member 212, which is located inside the connecting pipe 1 24. When water circulates inside the connecting pipe 1 24, the spiral drive member 212 drives the rotating rod 25 to rotate.

[0042] The two sides of the rotating frame 26 are connected to the shell kit 27, and the cleaning block 28 is slidably installed inside the shell kit 27. The shell kit 27 is provided with a telescopic spring 210 for resetting the cleaning block 28. During the rotation of the rotating frame 26, the cleaning block 28 is pushed into the air inlet hole 23, thereby pushing the debris at the air inlet hole 23 out of the air inlet pipe 22. The size of the cleaning block 28 is matched with the size of the air inlet hole 23, and the shell kit 27 is provided with a structure to prevent the cleaning block 28 from falling out.

[0043] like Figure 9 and Figure 10 As shown, the side of the rotating rod 25 is connected to multiple groups of connecting pipes 211, and a cavity is provided inside the cleaning block 28. The connecting pipe 211 is connected to the cavity of the cleaning block 28, and the water inside the rotating rod 25 enters the cleaning block 28 through the connecting pipe 211.

[0044] like Figures 8 to 10 As shown, the bottom of the rotating rod 25 is located inside the connecting pipe 1 24, a water inlet hole 214 is opened at the bottom of the rotating rod 25, a water outlet hole 213 is opened on the side of the rotating rod 25, and the connecting pipe 211 is connected to the rotating rod 25 through the water outlet hole 213. The water inside the connecting pipe 1 24 enters the interior of the rotating rod 25 through the water inlet hole 214, and then enters the interior of the cleaning block 28 through the connecting pipe 211, and is finally sprayed out through the spray hole 29.

[0045] The butt joint fitting 16 is provided with an annular recessed groove 21, and multiple groups of air intake pipes 22 are located in the annular recessed groove 21. The setting of the recessed groove 21 allows the air intake pipes 22 to be hidden therein, thereby preventing the air intake pipes 22 from being damaged when the protective pipe 14 is laid out. At the same time, the structural shape of the butt joint fitting 16 also makes it more convenient to pass through the protective pipe 14. Multiple groups of air intake pipes 22 are arranged on the outside of the protective pipe 14 along the radial annular array of the protective pipe 14.

[0046] Specifically, a sampling monitoring host 17 is provided to connect to the gas sampling structure 114 , and the gas sampling structure 114 and the sampling monitoring host 17 are connected via a signal transmission line 110 .

[0047] More specifically, the protective pipeline 14 includes multiple groups of connecting pipes 15 and docking pipe fittings 16 that are docked with each other. There are multiple options for docking between the connecting pipes 15 and the docking pipe fittings 16, such as through flange connection. The specific docking position of the docking pipe fitting 16 is selected according to the focus position of gas sampling inside the goaf 11.

[0048] like Figure 2 As shown, the side of the coal seam air inlet tunnel 12 and the coal seam air outlet tunnel 13 away from the goaf 11 is a connecting tunnel 18 . In actual work, the hoist 111 and the sampling monitoring host 17 are arranged inside the connecting tunnel 18 .

[0049] A piston plug 113 is provided at both ends of the gas sampling structure 114. The gas sampling structure 114 and the two groups of piston plugs 113 slide simultaneously inside the protective pipe 14. The two groups of piston plugs 113 form a sampling cavity inside the protective pipe 14 for the gas sampling structure 114 to perform multi-component gas sampling. The gas sampling structure 114 has sampling sensors for multiple gases, which is common knowledge among people in this field and will not be elaborated on.

[0050] The sampling device also includes a winch 111, and the traction rope 112 of the winch 111 is respectively connected to the two ends of the gas sampling structure 114. When the winch 111 rotates in different directions, the gas sampling structure 114 can be moved in different directions inside the protective pipe 14. Here, the winch 111 is used as a moving drive method for the gas sampling structure 114.

[0051] The piston plug 113 has an opening for sealing the signal transmission line 110, the traction rope 112, and other structures. Unlike the prior art, the plug also moves on the flush pipe 19. The flush pipe 19 of the present invention does not move with the gas sampling structure 114. When the piston plug 113 slides inside the protective pipe 14, other structures do not move with it.

[0052] In summary, the present invention has the following comprehensive effects:

[0053] Rotary cleaning and hydraulic drive: The rotating frame 26 in the air pipe drives the cleaning block 28 to rotate through the spiral drive member 212, which can be driven by the water circulation in the connecting pipe 24, mechanically pushing out debris and cooperating with the water flow of the ejection hole 29 to achieve self-cleaning of the air inlet 23. The hydraulic drive replaces the traditional motor, using the water flow inside the flushing pipe 19 to push the spiral drive member 212, realizing automatic operation of the rotating frame 26 and reducing energy consumption. Multi-stage gas sampling mechanism: The gas sampling structure 114 is pulled back and forth in the protective pipe 14 by the winch 111. The piston-type emboli 113 at both ends form a closed sampling cavity, and continuous multi-point gas detection is combined with multiple sensors. The sampling path covers the coal seam air inlet tunnel 12 and the air outlet tunnel, and the radial annular array of air inlet pipes 22 collects gas from the goaf 11 in multiple directions. The protective structural design features an annular recessed groove 21 in the butt joint fitting 16, concealing the air intake pipe 22 to prevent mechanical damage during installation. The segmented pipeline, including the connecting pipe 15 and butt joint fitting 16, flexibly adapts to the complex environment of the goaf 11. The cleaning block 28 features a built-in telescopic spring 210, which retracts into the outer shell 27 when reset, preventing wear during non-operation.

[0054] Efficient anti-blocking and self-maintenance: The rotating cleaning block 28 and water flushing function dually, effectively resolving the problem of dust and coal dust clogging the air inlet 23 in the goaf 11 and ensuring continuous gas collection. The hydraulically driven, non-electrical design avoids electrical safety hazards underground and reduces maintenance frequency. Sampling accuracy and coverage are improved. The sealed sampling cavity formed by the piston plug 113 reduces gas mixing interference. Combined with real-time sensor monitoring, data is more accurate. The circular arrangement of multiple air inlet pipes 22 expands sampling coverage and reflects the spatial distribution characteristics of gas in the goaf 11. For safety and structural reliability, the hoist 111 and the monitoring host are located in the connecting tunnel 18, allowing remote operation to reduce direct exposure risks. The concealed air inlet pipe 22 and modular docking design of the protective pipeline 14 adapt to complex underground terrain and extend service life. Automation and low cost advantages: The cleaning and sampling process is fully automated, reducing manual intervention. The combination of hydraulic drive and mechanical structure reduces operation and maintenance costs.

[0055] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms under the guidance of the present invention, all of which are protected by the present invention.

Claims

1. A dynamic and precise sampling device for multi-component gas in goaf, characterized in that: Coal seam air inlet tunnels (12) and coal seam air outlet tunnels (13) are respectively provided above and below the goaf (11), and include: two groups of sampling devices extending into the goaf (11) along the coal seam air inlet tunnels (12) and the coal seam air outlet tunnels (13); the sampling devices include a protective pipe (14) arranged along the coal seam air inlet tunnels (12) and the coal seam air outlet tunnels (13); a gas sampling structure (114) reciprocatingly moves inside the protective pipe (14); and the protective pipe (14) includes a connecting pipe (15) and a butt joint fitting (16); The outside of the butt joint pipe (16) is provided with multiple groups of air inlet pipes (22), and the air inlet pipes (22) are provided with air inlet holes (23). The gas to be sampled by the gas sampling structure (114) enters the interior of the protective pipe (14) through the air inlet holes (23); a rotating frame (26) is provided inside the air inlet pipe (22), and a cleaning block (28) is installed on the rotating frame (26). The rotating frame (26) drives the cleaning block (28) to clean the air inlet holes (23) when rotating inside the air inlet pipe (22). At the same time, a spray hole (29) is provided on the cleaning block (28), and the spray hole (29) is used to flush and clean the air inlet holes (23).

2. A dynamic and precise sampling device for multi-component gas in goaf according to claim 1, characterized in that: A flushing pipe (19) is further provided inside the protection pipe (14), a connecting pipe (24) communicating with the flushing pipe (19) is fixedly installed inside the air inlet pipe (22), a rotating rod (25) is rotatably installed on the connecting pipe (24), and a rotating frame (26) is installed on the rotating rod (25).

3. A dynamic and precise sampling device for multi-component gas in goaf according to claim 2, characterized in that: The bottom of the rotating rod (25) is connected to a spiral driving member (212), which is located inside the connecting pipe (24). When water circulates inside the connecting pipe (24), the spiral driving member (212) drives the rotating rod (25) to rotate.

4. A dynamic and precise sampling device for multi-component gas in goaf according to claim 3, characterized in that: The side of the rotating rod (25) is connected to multiple groups of connecting pipes (211). A cavity is provided inside the cleaning block (28). The connecting pipe (211) is connected to the cavity of the cleaning block (28). Water inside the rotating rod (25) enters the cleaning block (28) through the connecting pipe (211).

5. The dynamic and precise sampling device for multi-component gas in goaf according to claim 4 is characterized in that: The bottom of the rotating rod (25) is located inside the connecting pipe (24). A water inlet hole (214) is provided at the bottom of the rotating rod (25). A water outlet hole (213) is provided on the side of the rotating rod (25). The connecting pipe (211) is connected to the rotating rod (25) through the water outlet hole (213). Water inside the connecting pipe (24) enters the interior of the rotating rod (25) through the water inlet hole (214), then enters the interior of the cleaning block (28) through the connecting pipe (211), and is finally ejected through the ejection hole (29).

6. The dynamic and precise sampling device for multi-component gas in goaf according to claim 1, characterized in that: Both sides of the rotating frame (26) are connected to a housing kit (27), and the cleaning block (28) is slidably mounted inside the housing kit (27). A telescopic spring (210) for resetting the cleaning block (28) is provided inside the housing kit (27). During the rotation of the rotating frame (26), the cleaning block (28) is pushed into the air inlet (23), thereby pushing debris at the air inlet (23) out of the air inlet pipe (22).

7. The dynamic and precise sampling device for multi-component gas in goaf according to claim 6, characterized in that: The butt joint pipe (16) is provided with an annular recessed groove (21), and a plurality of groups of air intake pipes (22) are located in the annular recessed groove (21). The plurality of groups of air intake pipes (22) are arranged outside the protective pipe (14) in a radial annular array along the protective pipe (14).

8. The dynamic and precise sampling device for multi-component gas in goaf according to claim 7, characterized in that: The protective pipe (14) comprises a plurality of groups of connecting pipes (15) and butting pipe fittings (16) that are butted against each other.

9. A dynamic precise sampling device for multi-component gas in goaf according to any one of claims 1 to 8, characterized in that: Both ends of the gas sampling structure (114) are provided with piston plugs (113). The gas sampling structure (114) and the two sets of piston plugs (113) slide simultaneously inside the protective pipe (14). The two sets of piston plugs (113) form a sampling cavity inside the protective pipe (14) for the gas sampling structure (114) to perform multi-component gas sampling.

10. The dynamic and precise sampling device for multi-component gas in goaf according to claim 9, characterized in that: The sampling device further comprises a winch (111), wherein a traction rope (112) of the winch (111) is respectively connected to both ends of the gas sampling structure (114), and when the winch (111) rotates in different directions, the gas sampling structure (114) is moved in different directions inside the protective pipe (14).

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