Movable underground air leakage testing device

Abstract

The utility model discloses a movable underground air leakage testing device which comprises an SF6 tracer gas releasing device and an SF6 tracer gas monitoring device. The SF6 tracer gas release device is used for quantitatively and uniformly releasing SF6 tracer gas in an area where an air leakage rule or an air leakage channel needs to be detected; the SF6 tracer gas monitoring device is used for monitoring tracer gas concentration and air leakage rate in an air leakage measuring area and detecting an air leakage channel of the measured area. The device disclosed by the utility model has the characteristics of simplicity in operation, uniformity and stability in tracer gas release, high tracer gas detection accuracy, convenience and high efficiency in measurement process, quick measurement result, real-time transmission of data results, light personnel burden and high personnel safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground air leakage inspection in coal mines, and particularly relates to a mobile underground air leakage testing device. Background Art

[0002] Air leakage in goaf refers to the phenomenon that the wind in the tunnel enters the goaf through the pores of coal and rock or the boreholes and anchors in the goaf, which is one of the main reasons for the spontaneous combustion of coal in the goaf. The main reason for air leakage in goaf is the pressure difference inside and outside the goaf. Specific reasons include lax sealing facilities, the crushing of coal and rock in the goaf due to mining, and the formation of air leakage channels. That is, when the coal seam is mined to form a relatively closed space, the pressure inside the goaf decreases with the deepening of coal mining, while the pressure of the working face is relatively high, resulting in a pressure difference, causing air to flow from the working face to the goaf, forming an air leakage channel. In addition, as the working face advances, the air inlet corner is not sealed properly. Under the action of the pressure difference inside and outside the goaf, the wind flows from the air inlet chute through the air inlet corner into the goaf, causing air leakage.

[0003] Air leakage monitoring in goaf is an effective means to prevent spontaneous combustion of coal. By releasing tracer gas into the goaf at the air inlet corner, using special measuring instruments to monitor gas at different points in the working face, return air chute and return air corner, recording time, intensity and other parameters to determine the main air leakage area and air leakage rate in the goaf, so as to understand the air leakage law in the goaf. It can provide theoretical guidance for the implementation of goaf blocking measures, which is of great significance for the prevention of spontaneous combustion of coal.

[0004] At present, artificial release is often used when measuring air leakage in goaf areas, and a handheld SF6 portable detector is used for measurement.

[0005] The existing technology has at least the following technical problems:

[0006] The preliminary preparation work is cumbersome and needs to be carried manually to the measurement site, which increases the burden on personnel and may reduce safety.

[0007] When the SF6 tracer gas is carried from the ground to the underground measurement site, the gas bag may be damaged, resulting in gas leakage. Or due to manual collection of SF6 tracer gas, the collected amount may be inaccurate or substandard, affecting the leakage measurement results.

[0008] During the tracer gas release process, the use of ordinary air bags for manual operation may cause the gas to fail to enter the goaf at a uniform speed and evenly.

[0009] When using the SF6 portable measuring instrument for testing, large measurement errors may occur due to differences in timing tools.

[0010] Therefore, it is necessary to design a mobile underground air leakage testing device to solve the above technical problems. Utility Model Content

[0011] In order to overcome the above technical problems, the purpose of the utility model is to provide a mobile underground air leakage testing device, which has the characteristics of simple operation, uniform and stable release of tracer gas, high accuracy of tracer gas detection, convenient and efficient measurement process, fast measurement results, real-time transmission of data results, light burden on personnel and high personnel safety.

[0012] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0013] A mobile underground air leakage testing device, comprising an SF6 tracer gas release device 1 and an SF6 tracer gas monitoring device 22;

[0014] The SF6 tracer gas release device 1 is used to release SF6 tracer gas quantitatively and evenly in an area where air leakage patterns or air leakage channels need to be ascertained;

[0015] The SF6 tracer gas monitoring device 22 is used to monitor the tracer gas concentration and the leakage rate in the air leakage measurement area, and detect the air leakage channel in the measured area.

[0016] The SF6 tracer gas release device 1 includes a control box 21 and a moving pulley block 2, and the moving pulley block 2 is installed at the bottom of the control box 21;

[0017] The SF6 tracer gas monitoring device 22 includes a monitoring box 23 and a transmission device, the transmission device includes a transmission gear 24 and a transmission track 49, the transmission gear 24 is installed on the back side of the monitoring box 23, the transmission track 49 is stuck between the transmission gears 24, covered by a fixed cover plate 50, and reinforced by a fixing nut 51, so that the monitoring equipment is firmly fixed to the tunnel wall, realizing the lateral movement of the SF6 gas monitoring device 22.

[0018] The control box 21 is used to protect the internal structure of the SF6 tracer gas release device 1, and to clarify the current state of the SF6 tracer gas release device 1 through the display device or control device on the surface of the control box 21, and to control the release of the tracer gas; the moving pulley block 2 is used to assist the SF6 tracer gas release device 1 to move in the tunnel; the monitoring box 23 is used to protect the internal structure of the SF6 tracer gas monitoring device 22, and to perform the tracer gas monitoring process through the display or control buttons on the surface of the box; the transmission gear 24 is used to fix the SF6 tracer gas monitoring device 22 to the wall of the measured area, and to realize the lateral movement of the device.

[0019] Preferably, a flow meter 17 is installed on the positive surface of the control box 21, and a pressure display 15, a flow display 16, a pressure regulating knob 14, and a control button 13 are installed on the right side of the flow meter;

[0020] Among them, the flow meter 17 is connected to the metering pump 5, and the pressure display 15, the flow display 16, the pressure regulating knob 14, and the control button 13 are respectively connected to the control center 43.

[0021] The pressure regulating knob 14 is installed parallel to the control button 13 and is located below the pressure display 15 and the flow display 16. The air outlet 11 is installed on the lateral surface of the control box 21. A portable handle 20 is installed on the outer surface of the control box 21 and is located above the air outlet 11. A control box door 18 is installed on the back surface of the control box 21. A driving power supply 19 is installed on the right side of the control box door 18. The driving power supply 19 is respectively connected to the pressure sensor 8, flow sensor 10, signal receiver 42 and control center 43 inside the control box 21.

[0022] The pressure sensor 8 is used to monitor the gas pressure in the gas pipe 6 and display it through the pressure display 15; the flow sensor 10 is used to monitor the amount of tracer gas released during a gas release process; the signal receiver 42 is used to receive the signal from the centralized control center or the ground, and transmit the signal to the control center 43 for releasing and stopping the tracer gas; the control center 43 is used to process the pressure and flow signals and control the release process of the tracer gas;

[0023] The gas outlet 11 is connected to the gas pipe 6 , so that the gas pipe 6 is inserted out from the inside of the box and connected to the gas outlet hose 12 outside.

[0024] A display 27 is installed on the front surface of the monitoring box 23, an alarm light 54 is installed on the left side of the display 27, and an operation button 28 is provided below. The operation button 28 is connected to the display 27. The display 27, the alarm light 54, and the operation button 28 are respectively connected to the power supply 34 and the data processor 39.

[0025] The lower surface of the monitoring box 23 is provided with an exhaust port 33, the left surface of the monitoring box 23 is provided with an air inlet 32, a gas monitoring tube 26 is provided in the middle of the air inlet 32, and the gas monitoring tube 26 is inserted into the monitoring box 23 and connected to the exhaust port 33;

[0026] The gas monitoring tube 26 enters the monitoring box 23 from outside the box through the air inlet 32 ​​on the side of the monitoring box 23, and after being connected with other devices inside the monitoring box 23, it turns to communicate with the exhaust port 33 at the bottom of the monitoring box 23 to discharge the gas.

[0027] The gas monitoring tube 26 outside the monitoring box 23 is connected to the telescopic tube 53, and the telescopic tube 53 is arranged on the side of the monitoring box 23. The two telescopic tubes 53 are connected by a rotating bearing 52. A gas probe 25 is installed at the end of the telescopic tube 53. A power supply line port 30 is installed on the right side surface of the monitoring box 23. A power line 31 is inserted in the middle of the power supply line port 30 to enter the monitoring box 23. A box handle 29 is installed on the upper surface of the monitoring box 23.

[0028] A gas storage tank 3 is placed at the lower part of the control box 21, a rotary valve 4 is installed at the upper outlet of the gas storage tank 3, a gas pipe 6 is connected to the upper part of the rotary valve 4, a metering pump 5, a pressure reducing valve 7, a pressure sensor 8, a control valve 9, and a flow sensor 10 are installed on the gas pipe 6 in sequence, and the end of the gas pipe 6 is inserted through the gas outlet 11 on the surface of the control box 21;

[0029] An air outlet hose 12 is connected to the outer port of the gas pipe 6, and a signal receiver 42 is installed on the left side of the gas storage tank 3. The top of the signal receiver 42 is connected to a control center 43. The control center 43 is connected to the control button 13, the pressure regulating knob 14, the pressure display 15, the flow display 16 on the surface of the box and the pressure reducing valve 7, the pressure sensor 8, the control valve 9, and the flow sensor 10 of the gas pipe 6 through a control line 44. The metering pump 5 is connected to the flow meter 17 on the surface of the control box 21.

[0030] A power supply 34 is installed at the bottom of the monitoring box 23, and the power supply 34 is connected to the power line 31. A power supply port 35 is installed on the power supply 34, and the power supply port is connected to the display 27, the data processor 39, the wireless signal transmitter 41, the SF6 concentration sensor 38, the air pump 37, the power device 45, and the alarm light 54 through the power supply line 36;

[0031] A power device 45 is installed on the right side of the power supply 34, and the power device 45 is connected to the gearbox 47 via a transmission line 46. A speed change gear 48 is installed inside the gearbox 47, and the speed change gear 48 is connected to the transmission gear 24; a data processor 39 is installed on the right side of the power device 45, and the data processor 39 is respectively connected to the display 27, the SF6 concentration sensor 38, the power device 45, the wireless signal transmitter 41, and the alarm light 54 via data lines, and the wireless signal transmitter 41 is located on the right side of the data processor 39, the SF6 concentration sensor 38 is installed on the gas monitoring tube 26, and the vacuum pump 37 is installed on the gas monitoring tube 26, and the gas monitoring tube 26 enters the monitoring box 23 through the air inlet 32 ​​and is connected to the exhaust port 33.

[0032] The beneficial effects of the utility model.

[0033] 1. The utility model is a mobile underground air leakage testing device, which releases SF6 tracer gas underground through an SF6 tracer gas release device. Compared with the traditional manual release of tracer gas, the SF6 tracer gas release device can be portable and mobile underground, and at the same time can ensure the accuracy of the tracer gas release amount, overcome the errors existing in manual operation, and realize uniform, quantitative and timed gas release, which is conducive to ensuring the stability and accuracy of gas release during the measurement process. At the same time, compared with the traditional method, it can reduce the burden on personnel and perform air leakage measurement more efficiently.

[0034] 2. The utility model is a mobile underground air leakage test device, which can monitor SF6 tracer gas through the tracer gas monitoring device, and can realize multiple functions such as automatic monitoring of gas concentration, calculation of air leakage rate and data transmission. Compared with the traditional manual handheld portable measuring instrument to monitor tracer gas, this design is more convenient, efficient and accurate, can overcome the uncertainty of manual concentration measurement, can accurately record the monitoring time, automatically calculate the air leakage rate and store and transmit the data, greatly saving the time required for measurement and manpower and material resources.

[0035] To sum up, compared with the background technology, the utility model has the characteristics of simple operation and high precision, and the design is novel and reasonable, and the applicability is strong. It is a mobile underground air leakage testing device for coal mine underground air leakage. The tracer gas is accurately released through the SF6 tracer gas release device, and then the gas concentration is monitored and the leakage rate is calculated through the SF6 tracer gas monitoring device to find out the possible leakage channels, so as to effectively grasp the mine leakage law, and provide a strong basis for the prevention and control of coal spontaneous combustion. It is an ideal underground air leakage detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a forward structural schematic diagram of the SF6 tracer gas release device of the utility model.

[0037] Figure 2 This is a schematic diagram of the back structure of the SF6 tracer gas release device of the utility model.

[0038] Figure 3 The figure is a schematic diagram of the internal structure of the SF6 tracer gas release device of the present invention.

[0039] Figure 4 It is a forward structural schematic diagram of the SF6 tracer gas monitoring device of the utility model.

[0040] Figure 5 This is a schematic diagram of the back structure of the SF6 tracer gas monitoring device of the utility model.

[0041] Figure 6It is a schematic diagram of the internal structure of the SF6 tracer gas monitoring device of the utility model.

[0042] Notes in the figure: 1. SF6 tracer gas release device; 2. Dynamic pulley; 3. Gas storage tank; 4. Rotary valve; 5. Metering pump; 6. Gas pipe; 7. Pressure reducing valve; 8. Pressure sensor; 9. Control valve; 10. Flow sensor; 11. Gas outlet; 12. Gas outlet hose; 13. Control button; 14. Pressure regulating knob; 15. Pressure display; 16. Flow display; 17. Flow meter; 18. Control box door; 19. Driving power supply; 20. Portable handle; 21. Control box; 22. SF6 tracer gas monitoring device; 23. Monitoring box; 24. Transmission gear; 25. Gas probe; 26. Monitoring tube; 27. Display Indicator; 28. Operation button; 29. ​​Box handle; 30. Power supply line port; 31. Power cord; 32. Air inlet; 33. Exhaust port; 34. Power supply; 35. Power supply port; 36. Power supply line; 37. Air pump; 38. SF6 concentration sensor; 39. Data processor; 40. Data line; 41. Wireless signal transmitter; 42. Signal receiver; 43. Control center; 44. Control line; 45. Power unit; 46. Transmission line; 47. Gearbox; 48. Variable speed gear; 49. Transmission track; 50. Fixed cover; 51. Fixed nut; 52. Rotating bearing; 53. Telescopic tube; 54. Warning light. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] See also Figure 1-6 The utility model provides a mobile underground air leakage test device, including an SF6 tracer gas release device 1 and an SF6 gas monitoring device 22. The SF6 tracer gas release device 1 is installed at the tracer gas release point and is used for quantitative and uniform release of the tracer gas. Figure 1 , Figure 2 As shown, the main body of the SF6 tracer gas release device 1 is composed of a control box 21 and a moving pulley 2. The moving pulley 2 is installed at the bottom of the control box 21. The portable handle 20 is installed on both sides of the control box 21. As the working surface advances, it is used to move the control box 21 and the moving pulley 2.

[0045] The control box 21 is provided with a flow meter 17 mounted on its front surface for monitoring the amount of gas remaining in the gas tank 3; the pressure display 15 on the right side of the flow meter 17 is used to display the internal pressure of the gas pipe 6;

[0046] The flow rate display 16 on the right side of the pressure display 15 is used to display the gas release amount during one tracer gas release process;

[0047] A pressure regulating knob 14 is installed below the pressure display 15 to control the pressure of the gas pipe 6; a control button 13 is installed on the right side of the pressure regulating knob 14 to control the gas release;

[0048] The control box 21 is provided with an air outlet 11 on the lateral surface, through which the gas pipe 6 can be inserted and discharged for release of tracer gas; the control box 21 is provided with a control box door 18 on the rear surface, which can be used for gas source replacement and equipment maintenance; a driving power supply 19 is provided on the right side of the control box door 18, and the driving power supply 19 is respectively connected to the pressure sensor 8, flow sensor 10, signal receiver 42 and control center 43 inside the control box 21, for powering the device.

[0049] like Figure 3 As shown, the control box 21 is internally installed with a gas tank 3 as a tracer gas source; the gas tank 3 is installed with a rotary valve 4 for controlling the release of gas from the gas tank 3; during the replacement of the gas tank 3 and the rotary valve 4, the control box door 18 of the control box 21 is opened, a new gas tank 3 is loaded and connected to the gas pipe 6 for replenishing the gas source;

[0050] The rotary valve 4 is connected to the metering pump 5, the pressure reducing valve 7, the pressure sensor 8, the control valve 9, and the flow sensor 10 in sequence through the gas pipe 6;

[0051] The metering pump 5 is connected to a flow meter 17, which is used to monitor the amount of gas remaining in the gas tank 3, and the amount of gas remaining in the gas tank 3 is displayed on the outside of the control box by the flow meter 17;

[0052] The pressure reducing valve 7 is connected to the pressure regulating knob 14 through the control hub 43, and the pressure of the gas released from the gas storage tank 3 reaches the required value by rotating the pressure regulating knob 14;

[0053] The pressure sensor 8 is connected to the pressure display 15 through the control center 43, and is used to monitor the gas pressure in the gas pipe 6 and display it through the pressure display 15;

[0054] The control valve 9 is connected to the control button 13 via the control hub 43 and is used to control the release and stop of the gas during the release of the tracer gas;

[0055] The flow sensor 10 is connected to the flow display 16 through the control center 43 to monitor the amount of tracer gas released during a gas release process; after reaching the required amount of gas, the control center 43 recognizes it and automatically closes the control valve 9 to stop the gas release;

[0056] The flow sensor 10 is connected to the gas pipe 6 through the gas outlet 11 and is connected to the external gas outlet hose 12 of the control box 21;

[0057] The gas outlet hose 12 is 0.5 m long and can be connected to the mine vertical pipe for gas release at a designated point;

[0058] The SF6 gas monitoring device 22 is used to monitor the tracer gas concentration and calculate the air leakage rate to detect the air leakage channel and air leakage law in the goaf; Figure 4 , Figure 5 The main body of the SF6 tracer gas monitoring device 22 shown in the figure is composed of a monitoring box 23 and a transmission device, the transmission device includes a transmission gear 24 and a transmission track 49, the transmission gear 24 is installed on the back side of the monitoring box 23, the transmission track 49 is stuck between the transmission gears 24, covered by a fixed cover plate 50, and reinforced by a fixing nut 51, so that the monitoring equipment is firmly fixed to the tunnel wall, realizing the lateral movement of the SF6 gas monitoring device 22.

[0059] A display 27 is installed on the front surface of the monitoring box 23 for displaying the monitored tracer gas concentration and air leakage rate; an alarm light 54 is installed on the left side of the display 27 to sound an alarm after detecting tracer gas; an operation button 28 is provided below the display 27 and is connected to the display 27 for operating the display 27.

[0060] An exhaust port 33 is installed on the lower surface of the monitoring box 23 to facilitate the exhaust of gas from the monitoring gas pipe 26; an air inlet 32 ​​is installed on the left surface of the monitoring box 23, so that the gas monitoring pipe 26 can be inserted into the monitoring box 23 and connected to the exhaust port 33 to exhaust gas; the outside of the gas monitoring pipe 26 is connected to the telescopic tube 53, and the telescopic tube 53 can be extended and shortened horizontally and vertically during the monitoring process. The telescopic tubes 53 are connected by a rotating bearing 52, and the rotating bearing 52 can control the telescopic tube 53 and the gas probe 25 to rotate 360° on the tunnel wall for detection. A gas probe 25 is installed at the end of the telescopic tube 53. After the gas probe 25 collects the gas, the vacuum pump 37 applies pressure to allow the gas to enter the monitoring box 23 for analysis.

[0061] A power supply line port 30 is installed on the right side surface of the monitoring box 23 for inserting a power line 31 into the monitoring box 23 . The power line 31 is connected to the downhole circuit and is used to power the SF6 tracer gas monitoring device 22 .

[0062] A box handle 29 is installed on the upper surface of the monitoring box 23 for easy carrying; a transmission gear 24 is installed on the back side of the monitoring box 23, and the transmission gear 24 can be fixed on the transmission track 49, and the lateral movement of the monitoring box 23 can be achieved by rotating.

[0063] like Figure 6 As shown, a power supply 34 is installed at the bottom of the monitoring box 23 and is connected to the power line 31 to serve as the power supply equipment of the entire device; the power supply port is connected to the display 27, the data processor 39, the wireless signal transmitter 41, the SF6 concentration sensor 38, the vacuum pump 37, the power device 45, and the alarm light 54 by the power supply line 36 for power supply.

[0064] A power device 45 is installed on the right side of the power supply 34 to provide power for the transmission gear 24; the power device 45 is powered by the power supply 34 and is connected to the gearbox 47 via a transmission line 46, and a speed change gear 48 is installed inside the gearbox 47 to control the lateral movement speed of the monitoring equipment; the speed change gear 48 is connected to the transmission gear 24 via a transmission line 46, and the transmission gear 24 can be fixed on the tunnel wall to realize lateral movement of the equipment.

[0065] A data processor 39 is installed on the right side of the power device 45; the data processor 39 is connected to the display 27, the wireless signal transmitter 41, the SF6 concentration sensor 38, the power device 45, and the alarm light 54 via the data line 40, and is used for calculating the gas concentration, time and leakage rate, and controlling the power device 45 to provide power for the lateral movement of the equipment.

[0066] The alarm light 54 is connected to the power source 34 through the power supply line 36. After the device detects the tracer gas, it is analyzed and processed by the data processor 39, and a signal is sent to control the alarm light 54 to sound an alarm.

[0067] A wireless signal transmitter 41 is installed on the right side of the data processor 39, which can transmit the stored data to the centralized control chamber or the ground for observation by staff.

[0068] The SF6 concentration sensor 38 is installed on the gas monitoring tube 26 to analyze the air sucked by the vacuum pump 37 to identify the concentration of SF6 tracer gas in the air; the vacuum pump 37 is installed on the gas monitoring tube 26; the outside of the gas monitoring tube 26 is connected to the telescopic tube 53, and the telescopic tubes 53 are connected by a rotating bearing 52. The rotating bearing 52 can realize 360° movement of the telescopic tube 53 and the gas probe 25. The gas probe 25 is installed at the end of the telescopic tube 53; the detection range can be maximized by extending and contracting the telescopic tube 53, and the telescopic tube 53 can be adjusted and replaced according to the height of the tunnel wall, so that the gas probe 25 is fully covered to achieve all-round detection; the gas monitoring tube 26 enters the monitoring box 23 through the air inlet 32; and is connected to the exhaust port 33, which is used for gas circulation and monitoring the entire process.

[0069] The SF6 tracer gas release device 1 is placed on one side of the air inlet tunnel. During a leakage measurement process, the air outlet hose 12 is connected to the bundle tube and placed at the designated point for gas release. The pressure reducing valve 7 is controlled by the pressure regulating knob 14 to set the required pressure value for deflation, the rotary valve 4 on the gas storage tank 3 is opened, and the control button 13 is pressed to open the control valve 9 for deflation operation. During the deflation process, the gas release amount is monitored by the flow display 16. When the required release amount is reached, it is automatically identified by the control center 43, thereby closing the control valve 9 to stop deflation, and completing the SF6 tracer gas release.

[0070] When the SF6 tracer gas monitoring device 22 is in use, firstly, a transmission track 49 is installed on the tunnel wall, so that the transmission gear 24 is stuck on the transmission track 49, and the fixed cover plate 20 is reinforced by the fixing nut 51 to ensure the safety of the equipment during operation; during the air leakage measurement process, the transmission gear 24 rotates to drive the monitoring box 23 to move horizontally on the tunnel wall to be measured, and at the same time, through the cooperation of the telescopic tube 53 and the rotating bearing 52, the gas probe 25 can perform an all-round scan on the tunnel wall to achieve full coverage detection of the tunnel wall; after the tracer gas is detected, it is recorded and processed by the data processor 39, and the wireless signal transmitter 41 transmits the recorded data such as the air leakage area, air leakage point and air leakage law to the control center or the ground to complete the air leakage test process.

[0071] The working principle of this utility model:

[0072] Step 1: After selecting the SF6 tracer gas release point, move the SF6 tracer gas release device 1 to this point and fix it, connect the equipment to the underground ring network, connect the gas storage tank 3 to the gas pipe 6, and then check the equipment. After confirming that the equipment is correct, open the rotary valve 5 of the gas storage tank, turn the pressure regulating knob 14 to set the pressure value, set the gas release rate parameter, and then connect the gas outlet hose 12 to the bundle pipe at the gas release point to prepare for the SF6 tracer gas release operation;

[0073] Step 2: First, fix the transmission track 49 horizontally in the middle of the wall surface of the area to be tested, then fix the SF6 tracer gas monitoring device 22 on the pre-installed transmission track 49, and cover it with a fixed cover plate 50 to prevent the equipment from falling, connect the power cord 31 with the underground cable, check the equipment, and start it after confirming that the equipment is correct, connect the equipment to the underground ring network, and then set the gas monitoring time and monitoring range parameters to complete the preparation work for SF6 tracer gas monitoring;

[0074] Step 3: At the SF6 tracer gas release device 1, manually press the control button 13 underground to start the deflation operation, or the centralized control center or the ground sends a signal remotely, and the signal receiver 42 in the SF6 tracer gas release device 1 receives the signal and transmits it to the control center 43, and the control center 43 controls the device to perform the deflation operation. After the deflation operation is initiated, a signal is sent to make the SF6 tracer gas monitoring device 22 react and start scanning and monitoring the gas. After the flow sensor 10 detects that the gas volume meets the standard, a signal is sent to control the control center 43 to control the device to stop deflation, and the SF6 tracer gas release process is completed;

[0075] Step 4: After receiving the gas release, the SF6 tracer gas monitoring device 22 starts to detect the gas. The device moves horizontally through the transmission track 49 to scan the walls in the area. The telescopic gas tube 53 connected to the gas probe 25 on the device can be extended and shortened. The two cooperate with the rotating bearing 52 to achieve full coverage of the entire measured area, and then detect the specific air leakage point. The continuous monitoring time of this process is set by the workers themselves, and the general monitoring time is not less than 30 minutes. After the monitoring equipment detects the SF6 tracer gas, the data processor 39 records the air leakage point and controls the alarm light 54 to sound an alarm in the area of ​​the air leakage phenomenon so that the staff can block it. The gas concentration is detected by the SF6 concentration sensor 38, and the data is transmitted to the data processor 39 to calculate the air leakage rate and the air leakage channel. At the same time, the data processor 39 controls the wireless signal transmitter 41 to transmit the detected air leakage point, air leakage channel and air leakage rate data to the centralized control center or the ground for the convenience of staff to view. The SF6 tracer gas monitoring process is completed.

[0076] Step 5. After the SF6 tracer gas monitoring process is completed, check the SF6 tracer gas monitoring device 22, and shut it down after confirming that it is correct. At the same time, turn the rotary valve 4 to close the gas storage tank 3 in the SF6 tracer gas release device 1 to prevent leakage. If you need to continue the leakage test, move the gas release device and the monitoring device and repeat the above operation.

Claims

1. A mobile underground air leakage testing device, characterized in that: It comprises an SF6 tracer gas release device (1) and an SF6 tracer gas monitoring device (22); The SF6 tracer gas release device (1) is used to release SF6 tracer gas quantitatively and evenly in an area where air leakage patterns or air leakage channels need to be ascertained; The SF6 tracer gas monitoring device (22) is used to monitor the tracer gas concentration and the leakage rate in the air leakage measurement area, and detect the air leakage channel in the measured area; The SF6 tracer gas release device (1) comprises a control box (21) and a moving pulley block (2), wherein the moving pulley block (2) is installed at the bottom of the control box (21); The SF6 tracer gas monitoring device (22) comprises a monitoring box (23) and a transmission device, wherein the transmission device comprises a transmission gear (24) and a transmission track (49), wherein the transmission gear (24) is mounted on the back side of the monitoring box (23), and the transmission track (49) is clamped between the transmission gears (24), covered by a fixed cover plate (50), and reinforced by a fixed nut (51), so that the monitoring device is firmly fixed to the tunnel wall, thereby realizing the lateral movement of the SF6 gas monitoring device (22).

2. A mobile underground air leakage testing device according to claim 1, characterized in that: A flow meter (17) is installed on the front surface of the control box (21), and a pressure display (15), a flow display (16), a pressure regulating knob (14), and a control button (13) are installed on the right side of the flow meter; The flow meter (17) is connected to the metering pump (5), and the pressure display (15), the flow display (16), the pressure regulating knob (14), and the control button (13) are respectively connected to the control center (43); The pressure regulating knob (14) is installed in parallel with the control button (13) and is located below the pressure display (15) and the flow display (16); an air outlet (11) is installed on the lateral surface of the control box (21); a portable handle (20) is installed on the outer surface of the control box (21) and is located above the air outlet (11); a control box door (18) is installed on the back surface of the control box (21); a driving power supply (19) is installed on the right side of the control box door (18); and the driving power supply (19) is respectively connected to the pressure sensor (8), the flow sensor (10), the signal receiver (42), and the control center (43) inside the control box (21).

3. A mobile underground air leakage testing device according to claim 2, characterized in that: The pressure sensor (8) is used to monitor the gas pressure in the gas pipe (6) and display it through the pressure display (15); the flow sensor (10) is used to monitor the amount of tracer gas released during a gas release process; the signal receiver (42) is used to receive a signal from the centralized control center or the ground, and transmit the signal to the control center (43) to release and stop the tracer gas; the control center (43) is used to process the pressure and flow signals and control the release process of the tracer gas; The gas outlet (11) is connected to the gas pipe (6), so that the gas pipe (6) is inserted out from the inside of the box and connected to the gas outlet hose (12) outside.

4. The mobile underground air leakage testing device according to claim 1, characterized in that: A display (27) is installed on the front surface of the monitoring box (23), an alarm light (54) is installed on the left side of the display (27), and an operation button (28) is provided below the display (27), the operation button (28) is connected to the display (27), and the display (27), the alarm light (54) and the operation button (28) are respectively connected to the power supply (34) and the data processor (39); An exhaust port (33) is installed on the lower surface of the monitoring box (23), an air inlet (32) is installed on the left surface of the monitoring box (23), a gas monitoring tube (26) is arranged in the middle of the air inlet (32), and the gas monitoring tube (26) is inserted into the monitoring box (23) and connected to the exhaust port (33); The gas monitoring tube (26) enters the monitoring box (23) from outside the box through the side air inlet (32) of the monitoring box (23).

5. The mobile underground air leakage testing device according to claim 4, characterized in that: The gas monitoring tube (26) outside the monitoring box (23) is connected to the telescopic tube (53), the telescopic tube (53) is arranged on the side of the monitoring box (23), the two telescopic tubes (53) are connected by a rotating bearing (52), a gas probe (25) is installed at the end of the telescopic tube (53), a power supply line port (30) is installed on the right side surface of the monitoring box (23), a power line (31) is inserted into the monitoring box (23) in the middle of the power supply line port (30), and a box handle (29) is installed on the upper surface of the monitoring box (23).

6. The mobile underground air leakage testing device according to claim 1, characterized in that: A gas storage tank (3) is placed at the lower part of the control box (21), a rotary valve (4) is installed at the upper outlet of the gas storage tank (3), a gas pipe (6) is connected to the upper part of the rotary valve (4), a metering pump (5), a pressure reducing valve (7), a pressure sensor (8), a control valve (9), and a flow sensor (10) are installed on the gas pipe (6) in sequence, and the end of the gas pipe (6) passes through the gas outlet (11) on the surface of the control box (21) and exits.

7. A mobile underground air leakage testing device according to claim 6, characterized in that: The outer port of the gas pipe (6) is connected to a gas outlet hose (12); a signal receiver (42) is installed on the left side of the gas storage tank (3); the upper part of the signal receiver (42) is connected to a control center (43); the control center (43) is connected to a control button (13), a pressure adjustment knob (14), a pressure display (15), a flow display (16) on the surface of the box, and a pressure reducing valve (7), a pressure sensor (8), a control valve (9), and a flow sensor (10) of the gas pipe (6) through a control line (44); and the metering pump (5) is connected to a flow meter (17) on the surface of the control box (21).

8. The mobile underground air leakage testing device according to claim 1, characterized in that: A power supply (34) is installed at the bottom of the monitoring box (23), the power supply (34) is connected to the power line (31), a power supply port (35) is installed on the power supply (34), and the power supply port is connected to the display (27), the data processor (39), the wireless signal transmitter (41), the SF6 concentration sensor (38), the air pump (37), the power device (45), and the alarm light (54) through the power supply line (36); A power device (45) is installed on the right side of the power source (34). The power device (45) is connected to a gearbox (47) via a transmission line (46). A speed change gear (48) is installed inside the gearbox (47). The speed change gear (48) is connected to the transmission gear (24). A data processor (39) is installed on the right side of the power device (45). The data processor (39) is connected to a display (27), an SF6 concentration sensor (38), the power device (45), a wireless signal transmitter (41), and an alarm light (54) via data lines. The wireless signal transmitter (41) is located on the right side of the data processor (39). The SF6 concentration sensor (38) is installed on a gas monitoring tube (26). The vacuum pump (37) is installed on the gas monitoring tube (26). The gas monitoring tube (26) enters the monitoring box (23) through an air inlet (32) and is connected to an exhaust port (33).

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