A gas flow law detection device and detection method for old empty areas prone to spontaneous combustion

Abstract

The present invention provides a gas flow law detection device and a detection method for an old empty area prone to spontaneous combustion, which belongs to the technical field of gas flow law detection. The device includes a fixed frame, and a release module and a detection module can be connected to the rear of the fixed frame. The present invention uses sulfur hexafluoride tracer gas to find out the leakage source and leakage sink of the old empty area, calculate the leakage wind speed of the old empty area, establish a mathematical model of leakage crack flow in the old empty area, invert the leakage flow field of the old empty area, use PFC3D numerical simulation technology to construct a three-dimensional model of the old empty area, and import the three-dimensional model into simulation software to simulate the evolution law of the flow field in the old empty area, and monitor the concentration and concentration change information of each area of ​​gas concentration at the same time. The above law analysis is combined to form the gas flow law of the old empty area, improve the measurement accuracy, and provide protection for underground safety; according to the measurement range of the detection sensor module, the vertical position is adjusted by the hydraulic telescopic frame at the same time, so as to form a three-dimensional detection model of the old empty area.

Description

Technical Field

[0001] The invention belongs to the technical field of gas flow law detection, and in particular relates to a gas flow law detection device for an old empty area prone to spontaneous combustion and a detection method thereof. Background Art

[0002] In recent years, the mine has been paying more attention to this area. Although a series of fire prevention and fire fighting measures have been taken, the effect is not good. Monitoring has found that the coal in the goaf has intermittently shown signs of oxidation, and the maximum methane concentration in the enclosed wall of the goaf currently monitored is about 4%. It can be predicted that there is a gas-enriched area inside the goaf, which increases the difficulty of fire prevention and fire fighting. The risks of gas prevention and fire fighting are also very high. Therefore, it is of great significance to carry out research on the detection technology of gas flow laws in deep old goafs that are prone to spontaneous combustion.

[0003] The patent application with publication number CN107237624A provides a method for monitoring the gas flow and effective stress change law of the mining coal body. Through on-site construction, a borehole that meets the on-site experimental conditions is drilled, and the borehole stress sensor is sent to the bottom of the borehole through a pulley track. The borehole stress sensor is connected to the borehole stress display through a wire to jointly monitor the mining stress value. The four-way pipes are connected one by one and sent to the bottom of the borehole, and then the hole is grouting and sealed. The three-way pipe is connected to the four-way pipe, the gas pressure gauge is connected to one end of the three-way, and the ball valve and the gas flow meter are connected to the other end of the three-way in turn. The gas pressure can be monitored when the ball valve is closed, and the gas flow can be monitored when the ball valve is opened. The effective stress change and gas flow law of the coal body in front of the working face under the influence of mining stress can be obtained through the monitoring results, which can reflect the changes in effective stress and gas content under the presence of gas in the coal body, providing technical support for guiding safe and efficient mining of coal mines.

[0004] The patent application with announcement number CN102706528B provides a test device for gas flow characteristics of loose coal rock mass, including a sealed cavity, a loading system, a gas supply and control system, a gas flow characteristics monitoring system and a collection computer; one side of the sealed cavity is sealed with a high-strength soft elastic material and is in contact with the loading system surface, and the side of the sealed cavity is provided with an air inlet and an air outlet, and the gas supply and control system, the gas flow characteristics monitoring system and the collection computer are connected to the air inlet and the air outlet respectively. The test device can realize laboratory test research on gas flow characteristics in coal rock mass with different degrees of looseness, and is a reliable, economical and simple experimental method.

[0005] Although the above technical solutions can improve the convenience of gas detection to a certain extent, there are still some problems: first, the accuracy of gas flow law detection is not high, and it is impossible to provide effective measures for underground safety and fire prevention; second, the installation and disassembly of the detection equipment is cumbersome and not convenient enough; third, it is impossible to fully detect the goaf, there are leakage areas, and there is a possibility of generalizing.

[0006] In summary, it is necessary to improve the existing gas flow law detection device. Summary of the invention

[0007] In order to comprehensively solve the above problems, especially to address the shortcomings of the prior art, the present invention provides a gas flow law detection device and a detection method for old goafs prone to spontaneous combustion, which can comprehensively solve the problems of low gas flow law detection accuracy, cumbersome disassembly and assembly of detection equipment, and inability to comprehensively detect goafs.

[0008] To achieve the above purpose, the present invention adopts the following technical means:

[0009] In a first aspect, the present invention provides a gas flow law detection device for an old empty area prone to spontaneous combustion, comprising a fixing frame, a release module and a detection module are connected to the rear of the fixing frame, the fixing frame comprises an insertion shaft, a drill bit is provided at the front end of the insertion shaft, a track shaft is provided inside the insertion shaft, an impact cone plug is nested inside the track shaft, an impact spring is provided at the rear of the impact cone plug, and a pull rope is provided at the middle position of the rear of the track shaft;

[0010] The release module comprises a first seat body, a first hydraulic telescopic frame is provided at the front end of the first seat body, a first threaded interface shaft is provided at the front end of the first hydraulic telescopic frame, a first rear frame is provided at the rear of the first seat body, a gas storage bin is provided inside the first rear frame body, a gas releaser is provided at the rear of the first rear frame body, a first wireless transmitter is provided at the upper side of the rear of the first rear frame body, a first semi-slide rail is provided at the upper part of the first seat body, and two groups of first semi-ring shielding arc frames are slidably connected to the upper part of the first semi-slide rail;

[0011] The detection module includes a second base body, a second rear frame is provided at the rear of the second base body, a detection processor is provided inside the second rear frame, a detection sensor module is installed at the rear of the second rear frame, the detection sensor module includes a gas leak detection sensor unit and a gas concentration monitoring unit, the release module and the detection module are installed in the old empty area, and the release module and the detection module are inserted into the inner wall of the old empty area through a fixing frame and fixedly installed.

[0012] Optionally, impact holes are provided on both sides of the front end of the insertion shaft, a base frame shaft is provided at the rear of the insertion shaft, a threaded socket is provided on the outer side of the upper part of the base frame shaft, and support openings are provided on both sides of the upper part of the base frame shaft.

[0013] Optionally, a driving motor is provided at the front end of the insertion shaft, a rotating shaft is provided at the output end of the driving motor, and a drill bit is installed at the front end of the rotating shaft.

[0014] Optionally, a power module is provided at the front end of the plug shaft, a fixed plate is horizontally inserted in the middle of the plug shaft, a track shaft is fixedly installed on the fixed plate, and one end of the three groups of impact springs are connected to the impact cone plug, and the other end is fixedly connected to the fixed plate.

[0015] Optionally, a steering shaft and two sets of guide fixed conduits are sequentially installed on the upper portion of the fixed plate, and the pull rope passes through the steering shaft and the two sets of guide fixed conduits in sequence.

[0016] Optionally, one end of the pull rope is connected to an impact cone plug, and the other end is connected to a handle frame. After the inspection is completed, the device needs to be disassembled, and the user pulls the pull rope, and the pull rope pulls the impact cone plug along the track axis to the inside of the plug shaft, thereby realizing the storage of the impact cone plug and achieving the effect of convenient disassembly; flip frames are provided on both sides of the handle frame, and the bottom of the flip frame is connected to a support frame, and the support frame can be inserted into the support port.

[0017] Optionally, a first micro hydraulic pump is provided at the rear of the first seat body, a first hydraulic telescopic frame is provided at the front end of the first micro hydraulic pump, a first inner warehouse is provided at the front end of the first threaded interface shaft, and the handle frame can be inserted into the first inner warehouse.

[0018] Optionally, a first handheld frame is provided on the upper portion of the first seat body, and first adsorption plates are provided on both sides of the first handheld frame.

[0019] Optionally, a first telescopic arc frame is provided at the front end of the first semi-ring shielding arc frame, a first sliding arc frame is provided at the front end of the first telescopic arc frame, a group of first adsorption frames are respectively provided on the first semi-ring shielding arc frame and the first sliding arc frame, a first telescopic spring is provided inside the first semi-ring shielding arc frame, one side of the first telescopic arc frame is fixedly connected to the first telescopic spring, a sliding seat is installed inside the first semi-ring shielding arc frame, the sliding seat is nested in the first half slide rail, a first fixed axis frame is connected to the side of the sliding seat, a telescopic axis frame is installed on the side of the first fixed axis frame, a second fixed axis frame is connected to the side of the telescopic axis frame, and the second fixed axis frame is fixedly connected to the first sliding arc frame.

[0020] Furthermore, two sets of rotatable and movable first semi-ring shielding arc frames are connected together through the first adsorption plate and the first adsorption frame without affecting the installation of the device, and the first telescopic arc frame and the first sliding arc frame inside them ensure that the upper part of the device exposed to the outside is completely covered to prevent objects falling from the upper part from damaging the device, thereby ensuring the safe use of the detection equipment.

[0021] Optionally, a second micro hydraulic pump is embedded in the front end of the second seat body, a second hydraulic telescopic frame is provided at the front end of the second micro hydraulic pump, a second threaded interface shaft is installed at the front end of the second hydraulic telescopic frame, a second hand-held frame is provided on the upper part of the second seat body, second adsorption plates are provided on both sides of the second hand-held frame, a second wireless transmitter is provided on the upper part of the second rear frame, a second semi-slide rail is provided on the upper part of the second seat body, two groups of second semi-ring shielding arc frames are slidably connected to the upper part of the second semi-slide rail, a second telescopic arc frame is provided at the front end of the second semi-ring shielding arc frame, a second sliding arc frame is provided at the front end of the second telescopic arc frame, a second adsorption frame is provided on the second semi-ring shielding arc frame and the second sliding arc frame, and a second telescopic spring is provided inside the second semi-ring shielding arc frame and fixedly connected to one side of the second telescopic arc frame.

[0022] Furthermore, the second micro hydraulic pump is started, and the extension length of the second hydraulic telescopic frame is adjusted as needed. The spatial vertical position of the detection module is adjusted by the second hydraulic telescopic frame, thereby forming a three-dimensional detection model of the old empty area and achieving the effect of no blind spot detection.

[0023] In a second aspect, the present invention provides a detection method of the gas flow law detection device for the self-igniting old empty area according to the first aspect, comprising the following steps:

[0024] S1. Filling the gas storage bin inside the first rear frame of the release module with tracer gas, wherein sulfur hexafluoride is used as the tracer gas;

[0025] S2, the release module is installed on the fixing frame, the user holds the first hand-held frame, starts the driving motor, moves the release module installed on the fixing frame to the air inlet area of ​​the old empty area, waits for the drill bit to contact the inner wall to drill, stops after the first sliding arc frame contacts the inner wall, flips the support frame, and the impact cone plug impacts into the inner wall under the action of the impact spring;

[0026] S3, assembling a plurality of detection modules with a plurality of fixing frames respectively, installing the assembled detection modules to a plurality of positions of the old empty area through the fixing frames according to the detection range of the detection modules, and adjusting the vertical position of the detection sensor module by telescoping the second hydraulic telescopic frame, so as to form a three-dimensional detection model of the old empty area;

[0027] S4, start the detection module to continuously measure the gas information of multiple areas in the old empty area, and then start the release module to make the gas releaser start to release sulfur hexafluoride tracer gas;

[0028] S5. First, use sulfur hexafluoride tracer gas to find out the leakage source and leakage sink of the old empty area, calculate the leakage wind speed of the old empty area, and then establish a mathematical model of the leakage crack flow in the old empty area, invert the leakage flow field in the old empty area, and find out the expansion distribution law of the cracks in the old empty area;

[0029] S6. Use PFC3D numerical simulation technology to construct a three-dimensional model of the old empty area, and import the three-dimensional model into simulation software to simulate the flow field evolution law of the old empty area;

[0030] S7. The gas concentration monitoring unit in the detection sensor module monitors the gas concentration and concentration change information of each area, and forms the gas flow law of the old empty area according to the gas concentration and concentration change information of each area and the evolution law of the flow field in the old empty area simulated in step S6.

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

[0032] 1. Accurate measurement to provide guarantee for underground safety. The present invention uses sulfur hexafluoride tracer gas to find out the leakage source and leakage sink of the old empty area, calculate the leakage wind speed of the old empty area, establish a mathematical model of the leakage crack flow in the old empty area, invert the leakage flow field of the old empty area, find out the distribution law of the crack expansion in the old empty area, use PFC3D numerical simulation technology to build a three-dimensional model of the old empty area, and import the three-dimensional model into the simulation software FLUENT to simulate the evolution law of the flow field in the old empty area, while monitoring the concentration and concentration change information of each area of ​​gas concentration, and comprehensively analyze the above laws to form the gas flow law of the old empty area, improve the measurement accuracy, and provide guarantee for underground safety.

[0033] 2. Convenient disassembly and assembly. The present invention fixes the device in the horizontal and vertical directions through the drill bit and the impact cone plug at the front end of the plug shaft, thereby improving its stability. At the same time, when disassembling, it is only necessary to pull the handle frame backward to drive the pull rope to pull the impact cone plug into the plug shaft, and the support frame is flipped and supported in the support mouth, so that the device is fixed in contact horizontally, and then the drill bit is started, and the device is pulled backward to move the device out from the inner wall, thereby realizing convenient loading and unloading.

[0034] 3. Stereoscopic measurement without blind spots. According to the measurement range of the detection sensor module, the present invention installs fixed frames at multiple locations in the old empty area, and relies on hydraulic telescopic frames to adjust the vertical position of the space, thereby forming a three-dimensional detection model of the old empty area and achieving the effect of no blind spot detection.

[0035] 4. Ensure the safe use of the detection equipment. The two sets of rotatable and movable semi-ring shielding arc frames of the present invention are connected together by the adsorption frame thereon without affecting the installation of the device, and the internal telescopic arc frame ensures that the upper part of the device exposed to the outside is completely covered to prevent objects falling from the upper part from damaging the device, thereby ensuring the safe use of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of assembling a release module and a fixing frame of a gas flow law detection device for an old empty space prone to spontaneous combustion in one embodiment of the present invention;

[0037] Figure 2It is a schematic diagram of the assembly of a detection module and a fixing frame of a gas flow law detection device for an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the present invention in an embodiment of the present invention when the impact cone plug is stored in the fixing frame of the gas flow law detection device for the self-igniting old empty area;

[0039] Figure 4 It is a schematic diagram of the structure of a release module of a device for detecting gas flow rules in an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0040] Figure 5 It is a schematic diagram of the structure of a detection module of a device for detecting gas flow laws in an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0041] Figure 6 It is a schematic structural diagram of a device for detecting gas flow rules in an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0042] Figure 7 It is a front view and a partial cross-sectional view of a gas flow law detection device for an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0043] Figure 8 It is a schematic diagram of the impact cone plug in the fixing frame of the gas flow law detection device for the self-igniting old empty area in one embodiment of the present invention when it is opened;

[0044] Fig. 9 The present invention Figure 8 A partial enlarged view of the middle part;

[0045] Fig.10 It is a schematic diagram of the internal structure of a fixing frame of a device for detecting gas flow rules in an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0046] Fig.11 The present invention Fig.10 A partial enlarged view of point B in the middle;

[0047] Fig.12 It is a partial schematic diagram of a fixing frame of a device for detecting gas flow patterns in an old empty space prone to spontaneous combustion in one embodiment of the present invention;

[0048] Fig.13 The present invention Fig.12 A partial enlarged view of point C in the middle;

[0049] Fig.14 It is a schematic diagram of the structure of a release module of a device for detecting gas flow rules in an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0050] Fig.15It is an assembly diagram of a release module of a gas flow law detection device for an old empty area prone to spontaneous combustion in one embodiment of the present invention;

[0051] Fig.16 It is a schematic diagram of the structure of a gas flow law detection device for an old empty area prone to spontaneous combustion in one embodiment of the present invention when it is installed in the old empty area;

[0052] Fig.17 The present invention is a schematic diagram of the installation of a gas flow law detection device for self-igniting old empty areas when detecting old empty areas in one embodiment of the present invention.

[0053] In the figure: 1. fixed frame; 2. release module; 3. detection module; 4. old empty area; 11. plug shaft; 12. drive motor; 13. power module; 14. fixed plate; 15. track shaft; 16. pull rope; 17. steering shaft; 18. guide fixed guide tube; 19. handle frame; 21. first seat body; 22. first micro hydraulic pump; 23. first threaded interface shaft; 24. first rear frame; 25. first half slide rail; 26. first wireless transmitter; 27. gas releaser; 28. first hand-held frame; 29. ​​first adsorption plate; 30. first half ring shielding arc frame; 31. detection sensor module; 32. second seat body; 33. second rear frame; 34. second wireless transmitter; 35. second hand-held frame; 36. second half slide rail; 37. second half ring shielding arc frame; 38 , second micro hydraulic pump; 39, second threaded interface shaft; 111, impact hole; 112, threaded socket; 113, base shaft; 121, rotating shaft; 122, drill bit; 151, impact spring; 152, impact cone plug; 191, flip frame; 192, support frame; 221, first hydraulic telescopic frame; 231, first inner warehouse; 301, first telescopic arc frame; 302, first sliding arc frame; 303, first adsorption frame; 304, first telescopic spring; 305, slide seat; 306, first fixed axis frame; 307, telescopic axis frame; 308, second fixed axis frame; 351, second adsorption plate; 371, second telescopic arc frame; 372, second sliding arc frame; 373, second adsorption frame; 381, second hydraulic telescopic frame; 41, inner wall; 1131, support port. DETAILED DESCRIPTION

[0054] The present invention is further described below in conjunction with the accompanying drawings.

[0055] Embodiment 1:

[0056] like Figures 1 to 7 , Figures 10 to 12 and Figure 16 to Figure 17As shown, in one embodiment of the present invention, a gas flow law detection device for an old empty area prone to spontaneous combustion comprises a fixing frame 1, a release module 2 and a detection module 3 are connected to the rear of the fixing frame 1, the fixing frame 1 comprises an insertion shaft 11, a drill bit 122 is provided at the front end of the insertion shaft 11, a track shaft 15 is provided inside the insertion shaft 11, an impact cone plug 152 is nested inside the track shaft 15, an impact spring 151 is provided at the rear of the impact cone plug 152, and a pull rope 16 is provided at the middle position of the rear of the track shaft 15; the release module 2 comprises a first seat body 21, a first hydraulic telescopic frame 221 is provided at the front end of the first hydraulic telescopic frame 221, a first threaded interface shaft 23 is provided at the front end of the first seat body 21, a first rear frame body 24 is provided at the rear of the first rear frame body 24, and a There is a gas storage warehouse, a gas releaser 27 is provided at the rear of the first rear frame 24, a first wireless transmitter 26 is provided on the upper side of the rear of the first rear frame 24, a first half slide rail 25 is provided on the upper part of the first seat 21, and two groups of first half-ring shielding arc frames 30 are slidably connected on the upper part of the first half slide rail 25; the detection module 3 includes a second seat 32, a second rear frame 33 is provided at the rear of the second seat 32, a detection processor is provided inside the second rear frame 33, a detection sensor module 31 is installed at the rear of the second rear frame 33, and the detection sensor module 31 includes a gas leak detection sensor unit and a gas concentration monitoring unit, the release module 2 and the detection module 3 are installed in the old empty area 4, and the release module 2 and the detection module 3 are inserted into the inner wall 41 of the old empty area 4 through the fixing frame 1 and fixedly installed.

[0057] like Figures 8 to 9 As shown, impact holes 111 are provided on both sides of the front end of the insertion shaft 11, a base shaft 113 is provided at the rear of the insertion shaft 11, a threaded socket 112 is provided on the outer side of the upper part of the base shaft 113, and support openings 1131 are provided on both sides of the upper part of the base shaft 113.

[0058] like Figures 10 to 12 As shown, a driving motor 12 is provided at the front end of the insertion shaft 11 , a rotating shaft 121 is provided at the output end of the driving motor 12 , and a drill bit 122 is installed at the front end of the rotating shaft 121 .

[0059] Furthermore, before use, a plurality of fixing frames 1 are installed in the old empty area 4 , and the fixing frames 1 are laterally fixed by impacting the conical plugs 152 into the inner wall 41 under the action of the impact springs 151 .

[0060] Furthermore, during installation, the driving motor 12 is started, the driving motor 12 drives the rotating shaft 121 to rotate, and the rotating shaft 121 drives the drill bit 122 to rotate.

[0061] Embodiment 2:

[0062] like Figures 10 to 13As shown, in one embodiment of the present invention, a gas flow law detection device for an old empty area prone to spontaneous combustion is provided. On the basis of embodiment 1, a power module 13 is provided at the front end of the plug shaft 11, a fixing plate 14 is inserted horizontally in the middle of the plug shaft 11, and a track shaft 15 is fixedly installed on the fixing plate 14. One end of the three groups of impact springs 151 is connected to the impact cone plug 152, and the other end is fixedly connected to the fixing plate 14; a steering shaft 17 and two groups of guide fixed conduits 18 are installed in sequence on the upper part of the fixing plate 14, and one end of the pull rope 16 is connected to The impact cone plug 152 has the other end connected to the handle frame 19, and the pull rope 16 passes through the steering shaft 17 and two groups of guide fixed tubes 18 in sequence; the handle frame 19 is provided with a flip frame 191 on both sides, and the bottom of the flip frame 191 is connected to a support frame 192, and the support frame 192 can be inserted into the support port 1131; the pull rope 16 is attached to the steering shaft 17, and the direction of the pull rope 16 is changed by the steering shaft 17, and the pull rope 16 after the change of direction passes through the two groups of guide fixed tubes 18, so as to fix the moving direction of the pull rope 16.

[0063] Furthermore, after the detection is completed, the device needs to be disassembled, and the user pulls the pull rope 16, and the pull rope 16 pulls the impact cone plug 152 along the track axis 15 to move inside the plug shaft 11, thereby achieving the storage of the impact cone plug 152.

[0064] like Figures 14 to 17 As shown, a first micro hydraulic pump 22 is provided at the rear of the first seat body 21, a first hydraulic telescopic frame 221 is provided at the front end of the first micro hydraulic pump 22, a first inner warehouse 231 is provided at the front end of the first threaded interface shaft 23, and the handle frame 19 can be inserted into the first inner warehouse 231; a first hand-held frame 28 is provided at the upper part of the first seat body 21, and first adsorption plates 29 are provided on both sides of the first hand-held frame 28; a first telescopic frame 301 is provided at the front end of the first semi-ring shielding arc frame 30, and a first sliding arc frame 302 is provided at the front end of the first telescopic arc frame 301, and the first semi-ring shielding arc frame 30 and the first sliding arc frame 30 are provided. 2, a group of first adsorption frames 303 are respectively provided on the first semi-ring shielding arc frame 30, a first telescopic spring 304 is provided inside the first semi-ring shielding arc frame 30, one side of the first telescopic arc frame 301 is fixedly connected to the first telescopic spring 304, a slide seat 305 is installed inside the first semi-ring shielding arc frame 30, the slide seat 305 is nested in the first half slide rail 25, the side of the slide seat 305 is connected to the first fixed axis frame 306, the side of the first fixed axis frame 306 is installed with a telescopic axis frame 307, the side of the telescopic axis frame 307 is connected to the second fixed axis frame 308, and the second fixed axis frame 308 is fixedly connected to the first sliding arc frame 302.

[0065] A second micro hydraulic pump 38 is embedded in the front end of the second seat body 32, and a second hydraulic telescopic frame 381 is provided at the front end of the second micro hydraulic pump 38. A second threaded interface shaft 39 is installed at the front end of the second hydraulic telescopic frame 381. A second handheld frame 35 is provided on the upper part of the second seat body 32, and second adsorption plates 351 are provided on both sides of the second handheld frame 35. A second wireless transmitter 34 is provided on the upper part of the second rear frame 33. A second semi-slide rail 36 is provided on the upper part of the second seat body 32, and two groups of second semi-ring shielding arc frames 37 are slidably connected on the upper part of the second semi-slide rail 36. A second telescopic arc frame 371 is provided at the front end of the second semi-ring shielding arc frame 37, and a second sliding arc frame 372 is provided at the front end of the second telescopic arc frame 371. A second adsorption frame 373 is provided on the second semi-ring shielding arc frame 37 and the second sliding arc frame 372. A second telescopic spring is provided inside the second semi-ring shielding arc frame 37 and is fixedly connected to one side of the second telescopic arc frame 371.

[0066] Furthermore, the measurement method is: using sulfur hexafluoride tracer gas, the leakage sources and sinks of the old empty area 4 are found out, the leakage wind speed of the old empty area 4 is calculated, and then a mathematical model of the leakage crack flow in the old empty area 4 is established, the leakage flow field of the old empty area 4 is inverted, and the expansion distribution law of the cracks in the old empty area 4 is found out.

[0067] Specifically, the measurement method uses a tracer gas of a certain concentration to mark a certain part of the airflow, uses the wind pressure analysis of the mine ventilation system to explore the pressure energy distribution of each enclosed place, marks the leakage source and the leakage sink, releases the tracer gas at the leakage source, records the time of starting the release, and uses the detection module 3 to test the tracer in the airflow at the leakage sink. When the tracer is tested, the time at this time is recorded, the flow speed of the tracer between the leakage source and the leakage sink is calculated, and the leakage wind speed is reversed.

[0068] Furthermore, during use, the two sets of rotatable and movable first semi-ring shielding arc frames 30 are connected together through the first adsorption plate 29 and the first adsorption frame 303 without affecting the installation of the device, and the first telescopic arc frame 301 and the first sliding arc frame 302 inside them ensure that the upper part of the device exposed to the outside is completely covered to prevent objects falling from the upper part from damaging the device, thereby ensuring the safe use of the detection equipment.

[0069] Working principle:

[0070] Before detection, the user fills the gas storage tank in the release module 2 with tracer gas, and then first installs the release module 2 on a set of fixed frames 1 through the first threaded interface shaft 23, and then installs it in the air inlet area of ​​the old empty area 4. During installation, the user holds the first handheld frame 28, starts the drive motor 12, and moves the fixed frame 1 to a suitable position. After the drill bit 122 contacts the inner wall 41 and the hole enters a certain position, the support frame 192 is flipped, and the impact cone plug 152 impacts into the inner wall 41 under the action of the impact spring 151, so that the fixed frame 1 is fully fixed. When installing the fixed frame 1, the first sliding arc frame 302 is in direct contact with the inner wall 41 under the action of the first telescopic spring. The vertical position of the space is adjusted by the second hydraulic telescopic frame 381 as needed, and then the two groups of first semi-ring shielding arc frames 30 are slid along the first semi-slide rail 25, and the two groups of first semi-ring shielding arc frames 30 are directly adsorbed together to protect the equipment. The release module 2 can also be adjusted by the second hydraulic telescopic frame 381.

[0071] Then, the detection module 3 is installed on several other fixing frames 1. The fixing frames 1 are installed at appropriate positions according to the space conditions of the old empty area 4 and the detection range of the detection module 3. The installation and adjustment method of the detection module 3 refers to the installation and adjustment method of the release module 2.

[0072] During the inspection, each detection module 3 is started to continuously measure the gas information of each area in the old empty area 4, and then the release module 2 is started to make the gas releaser 27 start to release sulfur hexafluoride tracer gas. The sulfur hexafluoride tracer gas is used to find out the leakage source and leakage sink of the old empty area 4, and the leakage wind speed of the old empty area 4 is calculated. Then, a mathematical model of the leakage crack flow in the old empty area 4 is established, the leakage flow field of the old empty area 4 is inverted, and the expansion distribution law of the cracks in the old empty area 4 is found. The three-dimensional model of the old empty area 4 is constructed using the PFC3D numerical simulation technology, and the three-dimensional model is imported into the simulation software FLUENT to simulate the flow field evolution law of the old empty area 4. At the same time, the gas concentration monitoring unit in the detection sensor module 31 monitors the gas concentration and concentration change information of each area. According to the gas concentration and concentration change information of each area, and the simulated flow field evolution law of the old empty area 4, the gas flow law of the old empty area 4 is formed.

[0073] After the inspection is completed, each device is removed. The user first rotates and removes the release module 2 and the detection module 3 from the fixed frame 1, then pulls the handle frame 19 to flip the support frame 192 and insert it into the support port 1131. At this time, the pull rope 16 is pulled backward, and the pull rope 16 pulls the impact cone plug 152 along the track axis 15 to move inside the plug shaft 11, thereby realizing the storage of the impact cone plug 152, and then reversely starts the drive motor 12 to pull the device backward to move the fixed frame 1 out and remove it.

[0074] Embodiment 3:

[0075] This embodiment provides a detection method of the gas flow law detection device for the self-igniting old empty area described in Embodiment 1 or Embodiment 2, and the steps are as follows:

[0076] S1, filling the gas storage bin inside the first rear frame 24 of the release module 2 with tracer gas, wherein the tracer gas is sulfur hexafluoride;

[0077] S2, the release module 2 is installed on the fixing frame 1, the user holds the first hand-held frame 28, starts the driving motor 12, moves the release module 2 installed on the fixing frame 1 to the air inlet area of ​​the old empty area 4, waits for the drill bit 122 to contact the inner wall 41 to start drilling, stops after the first sliding arc frame 302 contacts the inner wall 41, flips the support frame 192, and the impact cone plug 152 impacts into the inner wall 41 under the action of the impact spring 151;

[0078] S3, assembling a plurality of detection modules 3 with a plurality of fixing frames 1 respectively, installing the assembled detection modules 3 to a plurality of positions of the old empty area 4 through the fixing frames 1 according to the detection range of the detection modules 3, and adjusting the vertical position of the detection sensor module 31 through the telescopic adjustment of the second hydraulic telescopic frame 381, so as to form a three-dimensional detection model of the old empty area 4;

[0079] S4, start the detection module 3 to start continuously measuring the gas information of multiple areas in the old empty area 4, then start the release module 2 to make the gas releaser 27 start releasing sulfur hexafluoride tracer gas;

[0080] S5. First, use sulfur hexafluoride tracer gas to find out the leakage source and leakage sink of the old empty area 4, calculate the leakage wind speed of the old empty area 4, then establish the mathematical model of the flow of the leakage cracks in the old empty area 4, invert the leakage flow field of the old empty area 4, and find out the expansion distribution law of the cracks in the old empty area 4;

[0081] S6. Use PFC3D numerical simulation technology to construct a three-dimensional model of the old empty area 4, and import the three-dimensional model into simulation software to simulate the flow field evolution law of the old empty area 4;

[0082] S7. The gas concentration monitoring unit in the detection sensor module 31 monitors the gas concentration and concentration change information of each area, and forms the gas flow law of the old empty area 4 according to the gas concentration and concentration change information of each area and the flow field evolution law of the old empty area 4 simulated in step S6.

[0083] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0084] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas flow law detection device for an old empty area prone to spontaneous combustion, comprising a fixing frame (1), a release module (2) and a detection module (3) being connected to the rear of the fixing frame (1), characterized in that: The fixing frame (1) comprises an insert shaft (11), impact holes (111) are provided on both sides of the front end of the insert shaft (11), a drill bit (122) is provided at the front end of the insert shaft (11), a track shaft (15) is provided inside the insert shaft (11), an impact cone plug (152) is embedded inside the track shaft (15), an impact spring (151) is provided at the rear of the impact cone plug (152), and a pull rope (16) is provided at the middle position of the rear of the track shaft (15); A fixing plate (14) is inserted horizontally in the middle of the plug shaft (11), a track shaft (15) is fixedly mounted on the fixing plate (14), a steering shaft (17) and two sets of guide fixing conduits (18) are sequentially mounted on the upper portion of the fixing plate (14), the pull rope (16) passes through the steering shaft (17) and the two sets of guide fixing conduits (18) in sequence, one end of the pull rope (16) is connected to the impact cone plug (152), and the other end is connected to the handle frame (19); The pull rope (16) is fitted on the steering shaft (17), and the pull rope (16) is changed in direction through the steering shaft (17). The changed pull rope (16) passes through two sets of guide fixing guide tubes (18) to fix the moving direction of the pull rope (16). When a user pulls the pull rope (16), the pull rope (16) pulls the impact cone plug (152) to move along the track shaft (15) toward the inside of the plug shaft (11), thereby realizing the storage of the impact cone plug (152); The release module (2) comprises a first base body (21), a first hydraulic telescopic frame (221) is provided at the front end of the first base body (21), a first threaded interface shaft (23) is provided at the front end of the first hydraulic telescopic frame (221), a first rear frame (24) is provided at the rear of the first base body (21), a gas storage bin is provided inside the first rear frame (24), a gas releaser (27) is provided at the rear of the first rear frame (24), a first wireless transmitter (26) is provided at the upper side of the rear of the first rear frame (24), a first semi-slide rail (25) is provided at the upper part of the first base body (21), and two groups of first semi-ring shielding arc frames (30) are slidably connected to the upper part of the first semi-slide rail (25); The detection module (3) comprises a second base body (32), a second rear frame (33) is provided at the rear of the second base body (32), a detection processor is provided inside the second rear frame (33), a detection sensor module (31) is installed at the rear of the second rear frame (33), and the detection sensor module (31) comprises a gas leak detection sensor unit and a gas concentration monitoring unit. The release module (2) and the detection module (3) are installed in the old empty area (4), and the release module (2) and the detection module (3) are inserted into the inner wall (41) of the old empty area (4) through the fixing frame (1) and fixedly installed.

2. The gas flow law detection device for the old empty area prone to spontaneous combustion according to claim 1 is characterized by: A base frame shaft (113) is provided at the rear of the insertion shaft (11), a threaded socket (112) is provided on the outer side of the upper part of the base frame shaft (113), and support openings (1131) are provided on both sides of the upper part of the base frame shaft (113).

3. The gas flow law detection device for old empty areas prone to spontaneous combustion according to claim 2 is characterized in that: A driving motor (12) is provided at the front end of the insertion shaft (11), a rotating shaft (121) is provided at the output end of the driving motor (12), and a drill bit (122) is installed at the front end of the rotating shaft (121).

4. The gas flow law detection device for old empty areas prone to spontaneous combustion according to claim 3 is characterized in that: A power module (13) is provided at the front end of the plug shaft (11); one end of the three groups of impact springs (151) is connected to the impact cone plug (152), and the other end is fixedly connected to the fixing plate (14).

5. The gas flow law detection device for old empty areas prone to spontaneous combustion according to claim 4 is characterized in that: Flip frames (191) are provided on both sides of the handle frame (19); a support frame (192) is connected to the bottom of the flip frame (191); and the support frame (192) can be inserted into the support opening (1131).

6. The gas flow law detection device for old empty areas prone to spontaneous combustion according to claim 5 is characterized in that: A first micro hydraulic pump (22) is embedded in the front end of the first seat body (21), a first hydraulic telescopic frame (221) is provided at the front end of the first micro hydraulic pump (22), a first inner compartment (231) is provided at the front end of the first threaded interface shaft (23), and the handle frame (19) can be inserted into the first inner compartment (231).

7. The gas flow law detection device for old empty areas prone to spontaneous combustion according to claim 6 is characterized in that: A first hand-held frame (28) is provided on the upper portion of the first seat body (21), and first adsorption plates (29) are provided on both sides of the first hand-held frame (28).

8. The gas flow law detection device for old empty areas prone to spontaneous combustion according to claim 7 is characterized in that: A first telescopic arc frame (301) is provided at the front end of the first semi-ring shielding arc frame (30), a first sliding arc frame (302) is provided at the front end of the first telescopic arc frame (301), a group of first adsorption frames (303) are respectively provided on the first semi-ring shielding arc frame (30) and the first sliding arc frame (302), a first telescopic spring (304) is provided inside the first semi-ring shielding arc frame (30), one side of the first telescopic arc frame (301) is fixedly connected to the first telescopic spring (304), a sliding seat (305) is installed inside the first semi-ring shielding arc frame (30), the sliding seat (305) is nested in the first half slide rail (25), the side of the sliding seat (305) is connected to a first fixed shaft frame (306), the side of the first fixed shaft frame (306) is installed with a telescopic shaft frame (307), the side of the telescopic shaft frame (307) is connected to a second fixed shaft frame (308), and the second fixed shaft frame (308) is fixedly connected to the first sliding arc frame (302); A second micro hydraulic pump (38) is embedded in the front end of the second seat body (32); a second hydraulic telescopic frame (381) is provided at the front end of the second micro hydraulic pump (38); a second threaded interface shaft (39) is installed at the front end of the second hydraulic telescopic frame (381); a second hand-held frame (35) is provided on the upper part of the second seat body (32); second adsorption plates (351) are provided on both sides of the second hand-held frame (35); a second wireless transmitter (34) is provided on the upper part of the second rear frame body (33); and a second semi-automatic transmission device (35) is provided on the upper part of the second seat body (32). A slide rail (36), the upper part of the second half slide rail (36) is slidably connected with two groups of second half-ring shielding arc frames (37), the front end of the second half-ring shielding arc frame (37) is provided with a second telescopic arc frame (371), the front end of the second telescopic arc frame (371) is provided with a second sliding arc frame (372), the second half-ring shielding arc frame (37) and the second sliding arc frame (372) are provided with a second adsorption frame (373), and the second half-ring shielding arc frame (37) is provided with a second telescopic spring inside and fixedly connected to one side of the second telescopic arc frame (371).

9. A detection method for the gas flow law detection device for the self-igniting old empty area according to claim 8, characterized in that: The steps include: S1, filling a tracer gas into a gas storage bin inside the first rear frame (24) of the release module (2), wherein the tracer gas is sulfur hexafluoride; S2, installing the release module (2) on the fixing frame (1), the user holds the first hand-held frame (28), starts the drive motor (12), moves the release module (2) installed on the fixing frame (1) to the air inlet area of ​​the old empty area (4), waits for the drill bit (122) to contact the inner wall (41) to start drilling, stops after the first sliding arc frame (302) contacts the inner wall (41), flips the support frame (192), and the impact cone plug (152) impacts into the inner wall (41) under the action of the impact spring (151); S3, assembling a plurality of detection modules (3) with a plurality of fixing frames (1) respectively, installing the assembled detection modules (3) to a plurality of positions of the old empty area (4) through the fixing frames (1) according to the detection range of the detection modules (3), and adjusting the vertical position of the detection sensor module (31) by telescoping the second hydraulic telescopic frame (381), thereby forming a three-dimensional detection model of the old empty area (4); S4, starting the detection module (3) to start continuously measuring the gas information of multiple areas in the old empty area (4), and then starting the release module (2) to make the gas releaser (27) start releasing sulfur hexafluoride tracer gas; S5. First, sulfur hexafluoride tracer gas is used to find out the leakage source and leakage sink of the old empty area (4), and the leakage wind speed of the old empty area (4) is calculated. Then, a mathematical model of the leakage crack flow of the old empty area (4) is established, and the leakage flow field of the old empty area (4) is inverted to find out the expansion distribution law of the cracks in the old empty area (4); S6. Use PFC3D numerical simulation technology to construct a three-dimensional model of the old empty area (4), and import the three-dimensional model into simulation software to simulate the flow field evolution law of the old empty area (4); S7, the gas concentration monitoring unit in the detection sensor module (31) monitors the gas concentration and concentration change information of each area, and forms the gas flow law of the old empty area (4) according to the gas concentration and concentration change information of each area and the flow field evolution law of the old empty area (4) simulated in step S6.

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