A coal mine tunnel gas leakage monitoring and positioning device and method

Abstract

The present invention discloses a coal mine tunnel gas leakage monitoring and positioning device and method, which relates to the field of coal mine gas control technology, including a remote processor, a first gas concentration sensor, a first locator and a mobile monitor, wherein the first gas concentration sensor is evenly distributed at the top of the tunnel along the length direction of the tunnel, an intermediate dividing line is provided between two adjacent first gas concentration sensors, the tunnel between the two adjacent intermediate dividing lines is a monitoring unit interval, the first locator is located in the middle of the bottom surface of the monitoring unit interval on one side close to the tunnel exit, the mobile monitor includes a mobile platform, a second locator is provided in the middle of the bottom surface of the mobile platform, and adjacently arranged gas concentration detection components and plugging agent spraying components are provided on the top surface of the mobile platform. The present invention adopts a coal mine tunnel gas leakage monitoring and positioning device and method of the above structure, which can solve the problem that the gas leakage monitoring and positioning method in the prior art has complicated steps and takes a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas control, and in particular to a coal mine tunnel gas leakage monitoring and positioning device and method. Background Art

[0002] Coal mine gas, also known as coal seam gas or coalbed methane, is a mixed gas composed of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks. Gas is a harmful factor in coal mine production. It not only pollutes the air, but also when the gas content in the air is 5% to 16%, it can cause explosions when encountering fire, resulting in accidents. Gas explosions can be prevented, such as regularly measuring the gas content in the air in the tunnel, measuring the amount of gas outburst, and taking effective ventilation, strictly prohibiting fireworks, pre-extraction, mining protective layers, artificial protrusion and other measures to ensure the safety of coal mine production.

[0003] Patent CN202311370550.8 discloses a coal mine underground gas control detection device and method, including: a mobile platform, a universal wheel and its driving mechanism are arranged under the mobile platform; a first positioner is fixedly arranged on the lower surface of the mobile platform; a first telescopic motor is fixedly arranged on the mobile platform, and a displacement sensor and a first gas concentration sensor are fixedly arranged at its output end; a plurality of second gas concentration sensors are evenly spaced at the top of the tunnel, and a second positioner is buried at any point at the bottom of each monitoring unit interval; a plurality of fixed second gas concentration sensors are arranged in the tunnel, which can monitor the gas concentration in the tunnel in a long-term and stable manner. When a gas leakage occurs, the two second gas concentration sensors at both ends of the gas leakage point can be used to quickly determine the monitoring unit interval where the gas leakage is located, which greatly shortens the time for locating the gas leakage point.

[0004] However, in this solution, the mobile platform needs to move along the X-axis and Y-axis respectively, and then the first telescopic motor moves along the Z-axis, so that the coordinates of the position with the highest gas concentration can be determined through the first gas concentration sensor and the displacement sensor. The process is complicated and time-consuming. In order to solve the above problems, it is necessary to provide a new gas leakage monitoring and positioning device and method. Summary of the invention

[0005] The purpose of the present invention is to provide a coal mine tunnel gas leakage monitoring and positioning device and method, so as to solve the problem that the gas leakage monitoring and positioning method in the prior art has complicated steps and takes a long time.

[0006] To achieve the above-mentioned objectives, the present invention provides a coal mine tunnel gas leakage monitoring and positioning device, including a remote processor, a first gas concentration sensor, a first positioner and a mobile monitor, wherein the first gas concentration sensor is evenly distributed at the top of the tunnel along the length direction of the tunnel, and an intermediate dividing line is provided between two adjacent first gas concentration sensors, and the tunnel between two adjacent intermediate dividing lines is a monitoring unit interval, and the first positioner is located in the middle of the bottom surface of the monitoring unit interval on one side close to the tunnel exit, and the mobile monitor includes a mobile platform, a second positioner and a displacement sensor are provided in the middle of the bottom surface of the mobile platform, and adjacently arranged gas concentration detection components and plugging agent spraying components are provided on the top surface of the mobile platform.

[0007] Preferably, the gas concentration detection component includes an explosion-proof power box, a vertical groove is provided on the side wall of the explosion-proof power box, a first lifting gas concentration sensor that can be lifted and lowered is provided in the vertical groove, a first lifting power device is provided in the explosion-proof power box, a boss is provided on the top surface of the explosion-proof power box, a lifting block connected to the first lifting power device is provided in the middle of the top surface of the boss, a second lifting gas concentration sensor is provided on the lifting block, mounting grooves are provided on both sides of the top surface of the boss, a movable plate is rotatably connected in the mounting groove, the movable plate is connected to the opening and closing control component, one end of the bottom surface of the movable plate is rotatably connected to the support shaft in the groove through a shaft sleeve, and the other end of the bottom surface of the movable plate is rotatably connected to the folding plate through a torsion spring, the second gas concentration sensors are evenly distributed on the top surfaces of the movable plate and the folding plate, and the bottom surfaces of the movable plate and the folding plate are respectively provided with energized demagnetizing magnets and magnet blocks.

[0008] Preferably, the opening and closing control component includes a bracket and a push-pull cylinder, the bracket includes two parallel rods and a connecting rod, the middle sections of the two parallel rods are respectively rotatably connected to the fixed shafts on the two side surfaces of the boss, the head ends of the two parallel rods are respectively connected to the two ends of the connecting rod, the connecting rod is correspondingly arranged below the rotating plate, the tail ends of the two parallel rods are respectively connected to one of the push-pull cylinders, and the outer shell end of the push-pull cylinder is hinged to the support plate on the explosion-proof power box.

[0009] Preferably, the first lifting gas concentration sensor is connected to a lifting assembly, and the lifting assembly includes a threaded rod rotatably arranged in the vertical groove, the first lifting gas concentration sensor is arranged on the nut seat of the threaded rod, a worm gear is arranged at the bottom of the threaded rod, the worm gear is meshingly connected with the worm, and the worm is connected to a first rotating power device located in the vertical groove.

[0010] Preferably, the plugging agent spraying assembly includes a second lifting power device, a lifting platform is provided on the lifting rod of the second lifting power device, a second rotating power device is provided on the top of the lifting platform, the output shaft of the second rotating power device is connected to the rotating platform, a spray gun and a camera are provided on the rotating platform, and the spray gun is connected to the discharge pump in the material box through a hose.

[0011] Preferably, a material level observation window is provided on the material box, and a material feed port is provided on the top surface of the material box.

[0012] Preferably, the displacement sensor, the second positioner, the first lifting gas concentration sensor, the first rotating power device, the first lifting power device, the second lifting gas concentration sensor, the energized demagnetizing magnet, the push-pull cylinder, the second gas concentration sensor, the second lifting power device, the second rotating power device, the camera and the discharge pump are all electrically connected to the battery in the explosion-proof power box.

[0013] Preferably, the height of the second lifting gas concentration sensor when the lifting block is in the lowest state is equal to the height of the second gas concentration sensor when the movable plate is in the horizontal state.

[0014] The method for monitoring and locating gas leakage in coal mine tunnels using a coal mine tunnel gas leakage monitoring and locating device comprises the following steps:

[0015] Step 1: A first gas concentration sensor or two adjacent first gas concentration sensors detect that the gas concentration exceeds a preset value, and sends an alarm signal to the processor. The monitoring unit interval where the first gas concentration sensor that sends the alarm signal is located is the alarm area;

[0016] Step 2: Determine whether it is a false alarm: 1) When the gas concentration detected by the first gas concentration sensor that sends out the alarm signal gradually increases within a monitoring cycle, and at the same time, the gas concentration detected by the first gas concentration sensor in the monitoring unit interval adjacent to the alarm area within a detection cycle is also rising, which means that gas is leaking, and the gas amount is increasing, and the danger level is gradually increasing, then it means that there is no false alarm;

[0017] 2) When the gas concentration detected by the first gas concentration sensor that sends out the alarm signal has only one sudden increase point in one detection cycle, and the gas concentration is a decreasing function as a whole, and at the same time, the gas concentration detected by the first gas concentration sensor in the monitoring unit interval adjacent to the alarm area is zero or unchanged in one detection cycle, it means that the gas has not leaked in large quantities, but only overflowed in small quantities, and has not reached the alarm level, then a false alarm has occurred;

[0018] Step 3: Take corresponding measures according to the conclusions drawn in step 2: if it is a false alarm, start the exhaust fan to exhaust the tunnel to blow the gas out of the tunnel, and stop the exhaust fan after the gas concentration detected by the first gas concentration sensor reaches the set safety value; if it is not a false alarm, start step 4;

[0019] Step 4: Start the mobile monitor to temporarily handle the leak point:

[0020] 1) Start the exhaust fan;

[0021] 2) The remote processor controls the mobile platform to move toward the alarm area. When the second locator corresponds to the first locator on the side of the alarm area close to the tunnel exit, the displacement data of the displacement sensor is reset to zero and the exhaust fan is stopped.

[0022] 3) Establish a coordinate system with the first locator as the origin, the length direction of the alarm area as the X-axis, the width direction of the lane as the Y-axis, and the height direction of the lane as the Z-axis;

[0023] 4) The movable plate is opened to a horizontal position by using the opening and closing control assembly, and then the demagnetizing magnet is energized to eliminate the magnetic attraction between it and the magnet block, thereby unfolding the folding plate under the action of the torsion spring. At this time, the second gas concentration sensor and the first lifting gas concentration sensor on the movable plate and the folding plate can be evenly distributed on the entire Y axis;

[0024] 5) The remote processor drives the mobile platform to move along the X-axis. The remote processor determines the two-dimensional coordinates of the highest gas concentration in the alarm area in the X-axis and Y-axis directions according to the gas concentration monitored by the second gas concentration sensor and the first lifting gas concentration sensor during the movement and the displacement signal detected by the displacement sensor. The opening and closing control component is used to open the movable plate in an inclined state, and the mobile platform is rotated so that the two movable plates are both located on the X-axis. Then the mobile platform is driven to move to the two-dimensional coordinates of the highest gas concentration. When the two-dimensional coordinates of the highest gas concentration are located near the end point of the Y-axis, the first lifting gas concentration sensor and the second lifting gas concentration sensor are controlled to perform lifting and lowering movements. The coordinates of the highest gas concentration position in the alarm area are determined according to the gas concentration monitored by the first lifting gas concentration sensor and the second lifting gas concentration sensor during the movement, and the lifting and lowering strokes of the first lifting power device and the nut seat. When the two-dimensional coordinates of the highest gas concentration are not located near the end point of the Y-axis, the first lifting gas concentration sensor is controlled to perform lifting and lowering movements. If the concentration is lower as it goes up, it proves that the leakage point is at the bottom of the tunnel. If the concentration is higher as it goes up, it proves that the leakage point is at the top of the tunnel.

[0025] 6) Using the second lifting power device and the second rotating power device to control the movement of the spray gun, so that the spray gun sprays the plugging agent to the area centered on the leakage point, and using a camera to check the spraying effect;

[0026] Step 5: Use exhaust fans for ventilation. When the gas concentration in the tunnel drops to a safe range, mobilize personnel to reinforce the leakage point.

[0027] Preferably, the duration of one detection cycle is 3-8 minutes.

[0028] Therefore, the present invention adopts the coal mine tunnel gas leakage monitoring and positioning device and method of the above structure, which has the following beneficial effects:

[0029] 1. The second gas concentration sensor can be evenly distributed in the entire Y-axis direction by using the movable plate and the folding plate;

[0030] 2. The opening and closing control assembly can be used to enable the mobile platform to turn when the movable plate and the folding plate are in the unfolded state;

[0031] 3. It can solve the problem of complicated steps and long time in the existing gas leakage monitoring and positioning method, and can determine the two-dimensional coordinates of the leakage point on the horizontal plane when the mobile platform moves along the X-axis direction.

[0032] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an embodiment of a mobile monitor in a coal mine tunnel gas leakage monitoring and positioning device of the present invention;

[0034] Figure 2 It is a structural schematic diagram of an embodiment of an opening and closing control component in a coal mine tunnel gas leakage monitoring and positioning device of the present invention;

[0035] Figure 3 It is a structural schematic diagram of an embodiment of a lifting assembly in a coal mine tunnel gas leakage monitoring and positioning device of the present invention;

[0036] Figure 4 It is a structural schematic diagram of an embodiment of a movable plate in a coal mine tunnel gas leakage monitoring and positioning device of the present invention;

[0037] Figure 5 The figure is a schematic diagram of the arrangement of the first gas concentration sensor in the coal mine tunnel gas leakage monitoring and positioning device of the present invention in the tunnel.

[0038] Reference numerals

[0039] 1. The first gas concentration sensor; 2. The first positioner; 3. The monitoring unit interval; 4. The mobile platform; 5. The explosion-proof power box; 6. The vertical slot; 7. The lifting assembly; 71. The threaded rod; 72. The nut seat; 73. The first lifting gas concentration sensor; 74. The worm gear; 75. The worm; 76. The first rotating power device; 8. The boss; 9. The lifting block; 10. The second lifting gas concentration sensor; 11. The movable plate; 12. The bushing; 13. The torsion spring; 14. The folding plate; 15. The second gas concentration sensor; 16. The power-on demagnetizing magnet; 17. The magnet block; 18. The opening and closing control assembly; 181. The bracket; 182. The push-pull cylinder; 19. The second lifting power device; 20. The lifting platform; 21. The second rotating power device; 22. The rotating platform; 23. The spray gun; 24. The camera; 25. The material box. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0041] Example

[0042] like Figure 1-5 As shown, a coal mine tunnel gas leakage monitoring and positioning device and method include a remote processor, a first gas concentration sensor 1, a first positioner 2 and a mobile monitor, and the first gas concentration sensor 1, the first positioner 2 and the mobile monitor are all connected to the remote processor. The first gas concentration sensor 1 is evenly distributed at the top of the tunnel along the length direction of the tunnel, and a middle dividing line is provided between two adjacent first gas concentration sensors 1. The tunnel between the two adjacent middle dividing lines is a monitoring unit section 3, and the first positioner 2 is located in the middle of the bottom surface of the monitoring unit section near the tunnel exit. The mobile monitor includes a mobile platform 4, a second positioner and a displacement sensor are provided in the middle of the bottom surface of the mobile platform 4, and a gas concentration detection component and a plugging agent spraying component are provided on the top surface of the mobile platform 4.

[0043] The gas concentration detection assembly includes an explosion-proof power box 5, a vertical slot 6 is provided on the side wall of the explosion-proof power box 5, and a first lifting gas concentration sensor 73 capable of lifting and lowering is provided in the vertical slot 6. The first lifting gas concentration sensor 73 is connected to the lifting assembly 7, and the lifting assembly 7 includes a threaded rod 71 rotatably arranged in the vertical slot 6, and the first lifting gas concentration sensor 73 is provided on the nut seat 72 of the threaded rod 71, and a worm wheel 74 is provided at the bottom of the threaded rod 71, and the worm wheel 74 is meshedly connected with a worm 75, and the worm 75 is connected with a first rotating power device 76 located in the vertical slot 6. The first rotating power device 76 is a motor, and the first rotating power device 76 can drive the first lifting gas concentration sensor 73 to lift and lower, and the lifting stroke of the first rotating power device 76 driving the first lifting gas concentration sensor 73 can be calculated by using the rotation speed, rotation time, parameters of the worm wheel 74 and the worm 75, and parameters of the threaded rod 71.

[0044] The explosion-proof power box 5 is provided with a first lifting power device, a boss 8 is provided on the top surface of the explosion-proof power box 5, a lifting block 9 connected to the first lifting power device is provided in the middle of the top surface of the boss 8, a second lifting gas concentration sensor 10 and a first lifting power device pneumatic cylinder are provided on the lifting block 9. The lifting stroke of the first lifting power device driving the second lifting gas concentration sensor 10 can be determined according to the air intake of the first lifting power device.

[0045] Both sides of the top surface of the boss 8 are provided with mounting grooves, in which a movable plate 11 is rotatably connected, one end of the bottom surface of the movable plate 11 is rotatably connected to the support shaft in the groove through a shaft sleeve 12, and the other end of the bottom surface of the movable plate 11 is rotatably connected to the folding plate 14 through a torsion spring 13. The top surfaces of the movable plate 11 and the folding plate 14 are evenly distributed with second gas concentration sensors 15, and the bottom surfaces of the movable plate 11 and the folding plate 14 are respectively provided with power-on demagnetizing magnets 16 and magnet blocks 17. When the lifting block 9 is in the lowest state, the height of the second lifting gas concentration sensor 10 is equal to the height of the second gas concentration sensor 15 when the movable plate 11 is in the horizontal state.

[0046] The movable plate 11 is connected to the opening and closing control component 18. The opening and closing control component 18 includes a bracket 181 and a push-pull cylinder 182. The bracket 181 includes two parallel rods and a connecting rod. The middle sections of the two parallel rods are respectively rotatably connected to the fixed shafts on the two side surfaces of the boss 8. The head ends of the two parallel rods are respectively connected to the two ends of the connecting rod. The connecting rods are correspondingly arranged below the rotating plate. The tail ends of the two parallel rods are respectively connected to a push-pull cylinder 182. The outer shell end of the push-pull cylinder 182 is hinged to the support plate on the explosion-proof power box 5. After the telescopic rod of the push-pull cylinder 182 in the opening and closing control component 18 is pushed out, the bracket 181 can be used to move the horizontal rod to an inclined or vertical position. After the telescopic rod of the push-pull cylinder 182 in the opening and closing control component 18 is retracted, the bracket 181 can be used to drag the horizontal rod to a horizontal position.

[0047] The plugging agent spraying assembly includes a second lifting power device 19, which is a pneumatic cylinder. A lifting platform 20 is provided on the lifting rod of the second lifting power device 19, and a second rotating power device 21 is provided on the top of the lifting platform 20, and the second rotating power device 21 is a motor. The output shaft of the second rotating power device 21 is connected to the rotating platform 22, and a spray gun 23 and a camera 24 are provided on the rotating platform 22. The spray gun 23 is connected to the discharge pump in the material box 25 through a hose. A material level observation window is provided on the material box 25, and a feed port is provided on the top surface of the material box 25.

[0048] The displacement sensor, the second positioner, the first lifting gas concentration sensor 73, the first rotating power device 76, the first lifting power device, the second lifting gas concentration sensor 10, the energized demagnetizing magnet 16, the push-pull cylinder 182, the second gas concentration sensor 15, the second lifting power device 19, the second rotating power device 21, the camera 24 and the discharge pump are all electrically connected to the battery in the explosion-proof power box 5, and the displacement sensor, the second positioner, the first lifting gas concentration sensor 73, the first rotating power device 76, the first lifting power device, the second lifting gas concentration sensor 10, the energized demagnetizing magnet 16, the push-pull cylinder 182, the second gas concentration sensor 15, the second lifting power device 19, the second rotating power device 21, the camera 24 and the discharge pump are all connected to the remote processor signal.

[0049] The bottom corners of the mobile platform 4 are all provided with driving components, which are prior art and can drive the mobile platform 4 to move. For example, the driving components may include a fixed frame, a bogie and wheels, the top of the fixed frame is fixed to the bottom surface of the mobile platform 4, a third rotary power device is provided on the fixed frame, a driving shaft of the third rotary power device passes through the bottom plate of the fixed frame and is connected to the top plate of the bogie, a rotating shaft is connected between the two side plates of the bogie, a wheel is fixed on the rotating shaft, one end of the rotating shaft passes through the bogie and is connected to the fourth rotary power device, the fourth rotary power device is fixed to the lower extension plate of the fixed frame, and the lower extension plate is arranged parallel to the side plate of the bogie. The third rotary power device is used to drive the mobile platform 4 to turn, and the fourth rotary power device is used to drive the mobile platform 4 to move.

[0050] The method for monitoring and locating gas leakage in coal mine tunnels using a coal mine tunnel gas leakage monitoring and locating device comprises the following steps:

[0051] Step 1: A first gas concentration sensor 1 or two adjacent first gas concentration sensors 1 detect that the gas concentration exceeds a preset value, and send an alarm signal to the processor. The monitoring unit interval 3 where the first gas concentration sensor 1 that sends the alarm signal is located is the alarm area;

[0052] Step 2: Determine whether it is a false alarm: 1) When the gas concentration detected by the first gas concentration sensor 1 that sends out the alarm signal gradually increases within a monitoring cycle, and at the same time, the gas concentration detected by the first gas concentration sensor 1 in the monitoring unit interval 3 adjacent to the alarm area within a detection cycle is also rising, it means that gas is leaking, and the amount of gas is increasing, and the degree of danger is gradually increasing, then it means that there is no false alarm. The time of a detection cycle is 3-8 minutes.

[0053] 2) When the gas concentration detected by the first gas concentration sensor 1 that sends out the alarm signal has only one sudden increase point in one detection cycle, and the gas concentration is a decreasing function as a whole, and at the same time, the gas concentration detected by the first gas concentration sensor 1 in the monitoring unit interval 3 adjacent to the alarm area is zero or unchanged in one detection cycle, it means that the gas has not leaked in large quantities, but only overflowed in small quantities, and has not reached the alarm level, then a false alarm has occurred;

[0054] Step 3: Take corresponding measures according to the conclusions drawn in step 2: if it is a false alarm, start the exhaust fan to exhaust the tunnel to blow the gas out of the tunnel, and stop the exhaust fan after the gas concentration detected by the first gas concentration sensor 1 reaches the set safety value; if it is not a false alarm, start step 4;

[0055] Step 4: Start the mobile monitor to temporarily handle the leak point:

[0056] 1) Start the exhaust fan;

[0057] 2) The remote processor controls the mobile platform 4 to move toward the alarm area. When the second locator and the first locator 2 on the side of the alarm area close to the tunnel exit overlap, the displacement data of the displacement sensor is reset to zero and the exhaust fan is stopped.

[0058] 3) Establish a coordinate system with the first locator 2 as the origin, the length direction of the alarm area as the X-axis, the width direction of the lane as the Y-axis, and the height direction of the lane as the Z-axis;

[0059] 4) The movable plate 11 is opened to a horizontal position by using the opening and closing control assembly 18, and then the demagnetizing magnet 16 is energized to eliminate the magnetic attraction between it and the magnet block 17, thereby unfolding the folding plate 14 under the action of the torsion spring 13. At this time, the second gas concentration sensor 15 and the first lifting gas concentration sensor 73 on the movable plate 11 and the folding plate 14 can be evenly distributed on the entire Y axis;

[0060] 5) The remote processor drives the mobile platform 4 to move along the X-axis. The remote processor determines the two-dimensional coordinates of the highest gas concentration in the alarm area in the X-axis and Y-axis directions according to the gas concentration monitored by the second gas concentration sensor 15 and the first lifting gas concentration sensor 73 during the movement and the displacement signal detected by the displacement sensor. The coordinate in the Y-axis direction is the actual horizontal distance from the second gas concentration sensor 15 or the first lifting gas concentration sensor 73 that detects the highest gas concentration to the X-axis. The opening and closing control component 18 is used to open the movable plate 11 in an inclined state, and the mobile platform 4 is rotated so that the two movable plates 11 are both located on the X-axis. Then, the mobile platform 4 is driven to move to the two-dimensional coordinates of the highest gas concentration. Coordinates, when the two-dimensional coordinates of the highest gas concentration are located near the end point of the Y-axis, the first lifting gas concentration sensor 73 and the second lifting gas concentration sensor 10 are controlled to perform lifting movements, and the coordinates of the position of the highest gas concentration in the alarm area are determined according to the gas concentrations monitored by the first lifting gas concentration sensor 73 and the second lifting gas concentration sensor 10 during the movement, and the lifting strokes of the first lifting power device and the nut seat 72. When the two-dimensional coordinates of the highest gas concentration are not located near the end point of the Y-axis, the first lifting gas concentration sensor 73 is controlled to perform lifting movements. If the concentration is lower as it goes up, it proves that the leakage point is at the bottom of the tunnel. If the concentration is higher as it goes up, it proves that the leakage point is at the top of the tunnel.

[0061] 6) Using the second lifting power device 19 and the second rotating power device 21 to control the movement of the spray gun 23, so that the spray gun 23 sprays the plugging agent to the area centered on the leakage point, and using the camera 24 to check the spraying effect;

[0062] Step 5: Use exhaust fans for ventilation. When the gas concentration in the tunnel drops to a safe range, mobilize personnel to reinforce the leakage point.

[0063] Therefore, the present invention adopts the coal mine tunnel gas leakage monitoring and positioning device and method of the above structure, which can solve the problem that the gas leakage monitoring and positioning method in the prior art has complicated steps and takes a long time.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A coal mine tunnel gas leakage monitoring and positioning device, characterized in that: It includes a remote processor, a first gas concentration sensor, a first locator and a mobile monitor, wherein the first gas concentration sensors are evenly distributed at the top of the tunnel along the length direction of the tunnel, a middle dividing line is provided between two adjacent first gas concentration sensors, and the tunnel between two adjacent middle dividing lines is a monitoring unit interval, the first locator is located in the middle of the bottom surface of the monitoring unit interval on one side close to the tunnel exit, the mobile monitor includes a mobile platform, a second locator and a displacement sensor are provided in the middle of the bottom surface of the mobile platform, and a gas concentration detection component and a plugging agent spraying component are provided on the top surface of the mobile platform; The gas concentration detection component includes an explosion-proof power box, a vertical groove is provided on the side wall of the explosion-proof power box, a first lifting gas concentration sensor that can be lifted and lowered is provided in the vertical groove, a first lifting power device is provided in the explosion-proof power box, a boss is provided on the top surface of the explosion-proof power box, a lifting block connected to the first lifting power device is provided in the middle of the top surface of the boss, a second lifting gas concentration sensor is provided on the lifting block, mounting grooves are provided on both sides of the top surface of the boss, a movable plate is rotatably connected in the mounting groove, the movable plate is connected to the opening and closing control component, one end of the bottom surface of the movable plate is rotatably connected to the support shaft in the groove through a shaft sleeve, and the other end of the bottom surface of the movable plate is rotatably connected to the folding plate through a torsion spring, the second gas concentration sensors are evenly distributed on the top surfaces of the movable plate and the folding plate, and the bottom surfaces of the movable plate and the folding plate are respectively provided with energized demagnetizing magnets and magnet blocks.

2. The coal mine tunnel gas leakage monitoring and positioning device according to claim 1 is characterized in that: The opening and closing control component includes a bracket and a push-pull cylinder. The bracket includes two parallel rods and a connecting rod. The middle sections of the two parallel rods are respectively rotatably connected to the fixed shafts on the two side surfaces of the boss. The head ends of the two parallel rods are respectively connected to the two ends of the connecting rod. The connecting rod is correspondingly arranged below the rotating plate. The tail ends of the two parallel rods are respectively connected to one of the push-pull cylinders. The outer shell end of the push-pull cylinder is hinged to the support plate on the explosion-proof power box.

3. The coal mine tunnel gas leakage monitoring and positioning device according to claim 2 is characterized in that: The first lifting gas concentration sensor is connected to the lifting component, and the lifting component includes a threaded rod rotatably arranged in the vertical groove, the first lifting gas concentration sensor is arranged on the nut seat of the threaded rod, and a worm gear is arranged at the bottom of the threaded rod, the worm gear is meshingly connected with the worm, and the worm is connected to the first rotating power device located in the vertical groove.

4. The coal mine tunnel gas leakage monitoring and positioning device according to claim 3 is characterized in that: The plugging agent spraying assembly includes a second lifting power device, a lifting platform is provided on the lifting rod of the second lifting power device, a second rotating power device is provided on the top of the lifting platform, the output shaft of the second rotating power device is connected to the rotating platform, a spray gun and a camera are provided on the rotating platform, and the spray gun is connected to the discharge pump in the material box through a hose.

5. The coal mine tunnel gas leakage monitoring and positioning device according to claim 4 is characterized in that: A material level observation window is provided on the material box, and a material feed port is provided on the top surface of the material box.

6. The coal mine tunnel gas leakage monitoring and positioning device according to claim 5, characterized in that: The displacement sensor, the second positioner, the first lifting gas concentration sensor, the first rotating power device, the first lifting power device, the second lifting gas concentration sensor, the energized demagnetizing magnet, the push-pull cylinder, the second gas concentration sensor, the second lifting power device, the second rotating power device, the camera and the discharge pump are all electrically connected to the battery in the explosion-proof power box.

7. The coal mine tunnel gas leakage monitoring and positioning device according to claim 6, characterized in that: When the lifting block is in the lowest state, the height of the second lifting gas concentration sensor is equal to the height of the second gas concentration sensor when the movable plate is in the horizontal state.

8. A method for monitoring and locating gas leakage in coal mine tunnels using the coal mine tunnel gas leakage monitoring and locating device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: A first gas concentration sensor or two adjacent first gas concentration sensors detect that the gas concentration exceeds a preset value, and sends an alarm signal to the processor. The monitoring unit interval where the first gas concentration sensor that sends the alarm signal is located is the alarm area; Step 2: Determine whether it is a false alarm: 1) When the gas concentration detected by the first gas concentration sensor that sends out the alarm signal gradually increases within a monitoring cycle, and at the same time, the gas concentration detected by the first gas concentration sensor in the monitoring unit interval adjacent to the alarm area within a detection cycle is also rising, which means that gas is leaking, and the gas amount is increasing, and the danger level is gradually increasing, then it means that there is no false alarm; 2) When the gas concentration detected by the first gas concentration sensor that sends out the alarm signal has a sudden increase point in a detection cycle, and the gas concentration is a decreasing function as a whole, and at the same time, the gas concentration detected by the first gas concentration sensor in the monitoring unit interval adjacent to the alarm area is zero or unchanged in a detection cycle, indicating that it has not reached the alarm level, then a false alarm has occurred; Step 3: Take corresponding measures according to the conclusions drawn in step 2: if it is a false alarm, start the exhaust fan to exhaust the tunnel to blow the gas out of the tunnel, and stop the exhaust fan after the gas concentration detected by the first gas concentration sensor reaches the set safety value; if it is not a false alarm, start step 4; Step 4: Start the mobile monitor to temporarily handle the leak point: 1) Start the exhaust fan; 2) The remote processor controls the mobile platform to move toward the alarm area. When the second locator corresponds to the first locator on the side of the alarm area close to the tunnel exit, the displacement data of the displacement sensor is reset to zero and the exhaust fan is stopped. 3) Establish a coordinate system with the first locator as the origin, the length direction of the alarm area as the X-axis, the width direction of the lane as the Y-axis, and the height direction of the lane as the Z-axis; 4) The movable plate is opened to a horizontal position by using the opening and closing control assembly, and then the demagnetizing magnet is energized to eliminate the magnetic attraction between it and the magnet block, thereby unfolding the folding plate under the action of the torsion spring. At this time, the second gas concentration sensor and the first lifting gas concentration sensor on the movable plate and the folding plate can be evenly distributed on the entire Y axis; 5) The remote processor drives the mobile platform to move along the X-axis. The remote processor determines the two-dimensional coordinates of the highest gas concentration in the alarm area in the X-axis and Y-axis directions according to the gas concentration monitored by the second gas concentration sensor and the first lifting gas concentration sensor during the movement and the displacement signal detected by the displacement sensor. The opening and closing control component is used to open the movable plate in an inclined state, and the mobile platform is rotated so that the two movable plates are both located on the X-axis. Then the mobile platform is driven to move to the two-dimensional coordinates of the highest gas concentration. When the two-dimensional coordinates of the highest gas concentration are located near the end point of the Y-axis, the first lifting gas concentration sensor and the second lifting gas concentration sensor are controlled to perform lifting and lowering movements. The coordinates of the highest gas concentration position in the alarm area are determined according to the gas concentration monitored by the first lifting gas concentration sensor and the second lifting gas concentration sensor during the movement, and the lifting and lowering strokes of the first lifting power device and the nut seat. When the two-dimensional coordinates of the highest gas concentration are not located near the end point of the Y-axis, the first lifting gas concentration sensor is controlled to perform lifting and lowering movements. If the concentration is lower as it goes up, it proves that the leakage point is at the bottom of the tunnel. If the concentration is higher as it goes up, it proves that the leakage point is at the top of the tunnel. 6) Using the second lifting power device and the second rotating power device to control the movement of the spray gun, so that the spray gun sprays the plugging agent to the area centered on the leakage point, and using a camera to check the spraying effect; Step 5: Use exhaust fans for ventilation. When the gas concentration in the tunnel drops to a safe range, mobilize personnel to reinforce the leakage point.

9. The method for monitoring and locating gas leakage in coal mine tunnels according to claim 8, characterized in that: The time for one detection cycle is 3-8 minutes.

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