A goaf air leakage measuring device

Abstract

The utility model belongs to the technical field of goaf air leakage measurement, concretely relates to a goaf air leakage measurement device. The measurement device includes SF6 instantaneous release mechanism and SF6 determination mechanism, SF6 instantaneous release mechanism includes gas storage tank and gas outlet pipeline, the gas outlet pipeline is arranged in the inside of gas storage tank, the gas outlet pipeline is along the axial arrangement of gas storage tank, and one end of gas outlet pipeline is connected with one end of gas storage tank, the other end of gas storage tank is connected with gas storage tank back cover, and the unidirectional inflation valve and instantaneous switch are arranged on the gas storage tank back cover, SF6 determination mechanism includes SF6 gas detector and tripod, and SF6 gas detector is arranged on the tripod. The device can obtain the air leakage of each measuring point by the instantaneous release of a certain volume of SF6 tracer gas in the release point position through SF6 instantaneous release mechanism and the real-time monitoring of SF6 concentration in the measuring point position through SF6 determination mechanism, and further judges the goaf air leakage area and prevents and treats.

Description

Technical Field

[0001] This utility model belongs to the field of goaf leakage measurement technology, specifically relating to a goaf leakage measurement device. Background Technology

[0002] Currently, most coal mines in my country use underground mining methods. Due to the impact of mining operations, coal faces generally suffer from multiple dimensions of air leakage and interconnected air leakage channels. Under ventilation pressure, significant air leakage can easily form in these channels, leading to a continuous oxygen supply to the goaf. This can easily cause spontaneous combustion of residual coal in the goaf, seriously threatening mine safety. Therefore, accurately measuring the air leakage in the goaf and identifying the leakage areas is crucial for mine fire prevention and ventilation system optimization.

[0003] Currently, SF6 (sulfur hexafluoride) tracer gas is commonly used in underground coal mine leakage measurement devices. SF6 is chemically stable, does not support combustion in air, and does not react with water, ammonia, or sulfuric acid. Due to these properties, SF6 is frequently used as a tracer gas. The principle of SF6 tracer gas measurement involves releasing a certain volume of SF6 tracer gas into the underground mine roadway, and then monitoring the concentration changes of SF6 tracer gas along the airflow direction to determine the leakage area. However, existing measurement devices have a long release time for SF6 tracer gas, often requiring several hours, resulting in slow monitoring efficiency and low reliability, which in turn leads to low accuracy in measuring air leakage in goaf areas. Utility Model Content

[0004] The purpose of this invention is to provide a goaf leakage measuring device that can instantly release a certain volume of SF6 tracer gas to accurately measure the leakage of the goaf.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A device for measuring air leakage in a goaf, comprising an SF6 instantaneous release mechanism and an SF6 measuring mechanism; The SF6 instantaneous release mechanism includes a gas storage tank and a gas outlet pipe. The gas outlet pipe is located inside the gas storage tank and is arranged along the axial direction of the gas storage tank. One end of the gas outlet pipe is connected to one end of the gas storage tank. The other end of the gas storage tank is connected to a gas storage tank rear cover. The gas storage tank rear cover is equipped with a one-way filling valve for filling the gas storage tank and an instantaneous switch for instantaneously releasing the gas in the gas storage tank. The SF6 instantaneous release mechanism is used to instantaneously release a certain volume of SF6 tracer gas at the release point. The SF6 measuring mechanism includes an SF6 gas detector and a tripod, with the SF6 gas detector mounted on the tripod. The SF6 measuring mechanism is used to monitor the SF6 concentration in real time at the measuring point.

[0006] Furthermore, a threaded groove is provided at the center of one end of the gas storage tank, and one end of the gas outlet pipe is located in the threaded groove, with the end of the gas outlet pipe connected to the atmosphere.

[0007] Furthermore, a piston groove is provided at the center of the rear cover of the gas tank, and a piston is provided in the piston groove. The piston can slide relative to the piston groove, and a gap is left between the piston and the piston groove.

[0008] Furthermore, the rear cover of the gas storage tank is provided with an air inlet and an air outlet, both of which are connected to the piston groove. A one-way inflation valve is installed on the air inlet; The air outlet is connected to a hose, and a momentary switch is installed on the hose.

[0009] Furthermore, one end of the piston is provided with sealing rubber, and the end of the piston with sealing rubber is close to the other end of the air outlet pipe.

[0010] Furthermore, a pressure gauge for determining the pressure inside the gas tank is installed along the edge of the rear cover.

[0011] Furthermore, the tripod includes a ball head, waist loop, clamp, and support frame; The SF6 gas detector is placed on a gimbal, with waist loops located on the front and rear sides of the gimbal, and the waist loops are equipped with straps for securing the SF6 gas detector. The clamping plates are located on the left and right sides of the gimbal, and the clamping plates are designed to be retractable. The support frame is located at the bottom of the gimbal.

[0012] Furthermore, the support frame includes a main frame, a connecting frame, and a base frame; The top of the main frame is fixed to the bottom of the gimbal, and the main frame is configured as a telescopic structure. The base frame consists of three parts, with the same end of each part connected to the same position circumferentially on the main frame. Each base frame has an anti-slip pad installed on the other end. Each base frame is designed to be telescopic. The connecting frame is configured as three, with the same end of the three connecting frames connected to the same position circumferentially at the bottom of the main frame; the other end of each connecting frame is connected to a corresponding base frame.

[0013] Furthermore, the release point is located near the corner of the air intake tunnel; The measurement points are set to multiple locations, with the first and last measurement points located in the intake airway and return airway, respectively. The distance between the first measurement point and the release point is ≥20m, and the distance between the first and last measurement points and the intake and return air corners is ≥10m, respectively.

[0014] Compared with the prior art, this utility model has the following advantages: As described above, this utility model relates to a goaf leakage measurement device. This device instantaneously releases a certain volume of SF6 tracer gas at the release point and monitors the SF6 concentration in real time at each measuring point, enabling the determination of the leakage volume between each measuring point, further identifying the leakage area in the goaf, and implementing preventative measures. The instantaneous SF6 release mechanism and SF6 measuring mechanism of this utility model are portable, easy to operate, and have low implementation costs. Furthermore, all equipment used in this utility model is reusable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the SF6 instantaneous release mechanism in a goaf air leakage measuring device of this utility model; Figure 2 This is a side view of the SF6 instantaneous release mechanism in a goaf air leakage measuring device of this utility model; Figure 3 This is a schematic diagram of the rear cover of the gas storage tank in a goaf air leakage measuring device of this utility model. Figure 4 This is a schematic diagram of the tripod in a goaf air leakage measuring device of this utility model; Figure 5 This is a schematic diagram of the SF6 gas detector being fixed on a tripod in a goaf air leakage measuring device of this utility model; Figure 6 This is a schematic diagram showing the locations of the release point and the measuring point in a goaf air leakage measuring device of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1-Gas tank, 2-Gas outlet pipe, 3-Threaded groove, 4-Gas tank rear cover, 5-Piston groove, 6-Piston, 7-Inlet, 8-Outlet, 9-One-way inflation valve, 10-Hose, 11-Instantaneous switch, 12-Pressure gauge, 13-Gimbal, 14-Waist loop, 15-Clamping plate, 16-SF6 gas detector, 17-Strap, 18-Main frame, 19-Base frame, 20-Connecting frame. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] An air leakage measuring device for goaf areas includes an SF6 instantaneous release mechanism and an SF6 measuring mechanism. This device, consisting of measuring components, is arranged at different locations within the goaf area, such as... Figure 6 As shown, an instantaneous SF6 release mechanism is placed at the release point, and an SF6 measuring mechanism is placed at each measuring point. The release point is located near the inlet corner of the air intake tunnel. Multiple measuring points are set up, with the first and last measuring points located in the air intake and return tunnels, respectively. The distance between the first measuring point and the release point is ≥20m, and the distances between the first and last measuring points and the inlet and return corners are ≥10m, respectively.

[0020] Specifically, such as Figures 1 to 3 As shown, the SF6 instantaneous release mechanism includes a gas storage tank 1 and a gas outlet pipe 2. The gas outlet pipe 2 is located inside the gas storage tank 1 and is arranged along the axial direction of the gas storage tank 1. A threaded groove 3 is provided at the center of the front end of the gas storage tank 1, and the front end of the gas outlet pipe 2 is located in the threaded groove 3. The front end of the gas outlet pipe 2 is sealed to the threaded groove 3, and the end of the front end of the gas outlet pipe 2 is open to the atmosphere. A gas storage tank rear cover 4 is connected to the rear end of the gas storage tank 1. The gas storage tank 1 and the gas storage tank rear cover 4 are threaded and sealed together. A piston groove 5 is provided at the center of the gas storage tank rear cover 4, and a piston 6 is provided in the piston groove 5. The piston 6 can slide relative to the piston groove 5, and the piston 6 will not disengage from the piston groove 5. A gap is left between the piston 6 and the piston groove 5. A sealing rubber is provided at the front end of the piston 6, and the front end of the piston 6 with the sealing rubber is close to the rear end of the gas outlet pipe 2. The piston 6 can block the rear end of the gas outlet pipe 2 by sliding in the piston groove 5. The rear cover 4 of the gas storage tank is equipped with an air inlet 7 and an air outlet 8, both of which are connected to a piston groove 5. A one-way filling valve 9 is installed on the air inlet 7, which connects to an SF6 gas cylinder for filling the gas storage tank 1. The air outlet 7 is connected to a hose 10, which is equipped with an instantaneous switch 11 for instantaneously releasing the SF6 gas from the gas storage tank 1. A pressure gauge 12 is also installed along the edge of the rear cover 4 of the gas storage tank, used to determine the internal pressure of the gas storage tank 1. The SF6 instantaneous release mechanism is compact, portable, and recyclable.

[0021] The SF6 instantaneous release mechanism is used to instantaneously release a certain volume of SF6 tracer gas at the release point. The specific operating steps are as follows: A pure concentration SF6 cylinder is filled into the storage tank 1 through a one-way filling valve 9. During filling, the piston 6, located in the piston groove 5, is subjected to filling pressure, moving towards the outlet pipe 2 and pressing against its rear end, thus sealing the storage tank 1. SF6 gas enters the storage tank 1 through the gap between the piston 6 and the piston groove 5. The pressure inside the storage tank 1 can be read using a pressure gauge 12. When SF6 gas needs to be released, the instantaneous switch 11 is opened. At this time, the gas between the piston 6 and the piston groove 5 flows into the atmosphere through the hose 10 and the instantaneous switch 11. The high-pressure gas in the storage tank 1 pushes the piston 6 into the piston groove 5, opening the rear end of the outlet pipe 2. The outlet pipe 2 is fixed in the threaded groove 3 and will not shift. The front end of the outlet pipe 2 is connected to the atmosphere, and the SF6 gas is instantaneously ejected into the atmosphere along the outlet pipe 3, achieving the purpose of instantaneous release.

[0022] like Figure 4 and Figure 5As shown, the SF6 measuring mechanism includes an SF6 gas detector 16 and a tripod. The SF6 gas detector 16 is mounted on the tripod; this is existing technology and will not be described in detail here. The tripod includes a pan-tilt head 13, a waist loop 14, a clamping plate 15, and a support frame. The SF6 gas detector 16 is placed on the pan-tilt head 13. The waist loop 14 is located on the front and rear sides of the pan-tilt head 13 and is equipped with straps 17 for securing the SF6 gas detector 16. The straps 17 can be elastic Velcro straps or other components with binding and securing functions. The clamping plate 15 is located on the left and right sides of the pan-tilt head 13 and is designed to be telescopic, meaning it can be adjusted according to the width of the SF6 gas detector 16. The support frame is located at the bottom of the pan-tilt head 13. The support frame includes a main frame 18, a base frame 19, and a connecting frame 20. The main frame 18, base frame 19, and connecting frame 20 can be connected in a fixed manner or in a movable manner to facilitate adjustment of the vertical support height as needed. For example, the top of the main frame 18 can be fixed to the bottom of the gimbal 13, and the main frame 18 can be configured as a telescopic structure, meaning its extension length can be adjusted. There are three base frames 19, each with one end hinged circumferentially to the main frame 18 at the same position, and the other end of each base frame 19 is equipped with an anti-slip pad; each base frame 19 is also telescopic, meaning its extension length can be adjusted. There are also three connecting frames 20, each with one end hinged circumferentially to the bottom of the main frame 18 at the same position; the other end of each connecting frame 20 is respectively hinged to one base frame 19. The unfolding angle of the base frame is adjustable. For example, one end of each of the three base frames 19 is hinged to a sleeve located at the position of the main frame 18. The sleeve can move up and down relative to the main frame 18 and be fixed, thereby adjusting the unfolding angle of the base frame 19. At the same time, the other ends of the three connecting frames 20 are also moved away from each other under the action of the base frame 19, so as to achieve an opening and closing angle of 0° to 180° at the bottom of the support frame. The telescopic structure of the main frame and base frame mentioned above can be achieved through the cooperation of the sleeve and the telescopic rod. That is, the end of the telescopic rod is inserted into the sleeve, and after being inserted to the corresponding depth, it can be locked by the buckle or the locking nut. The SF6 measuring mechanism is used to monitor the SF6 concentration in real time at the measuring point, and can obtain the air leakage between each measuring point, further determine the air leakage area in the goaf, and prevent and control it.

[0023] The present embodiment has now been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present invention. Of course, the above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the content of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention and should be protected by the present invention.

Claims

1. A device for measuring air leakage in a goaf, characterized in that, Includes an SF6 instantaneous release mechanism and an SF6 measurement mechanism; The SF6 instantaneous release mechanism includes a gas storage tank and a gas outlet pipe. The gas outlet pipe is located inside the gas storage tank and is arranged along the axial direction of the gas storage tank. One end of the gas outlet pipe is connected to one end of the gas storage tank. The other end of the gas storage tank is connected to a gas storage tank rear cover. The gas storage tank rear cover is equipped with a one-way filling valve for filling the gas storage tank and an instantaneous switch for instantaneously releasing the gas in the gas storage tank. The SF6 instantaneous release mechanism is used to instantaneously release a certain volume of SF6 tracer gas at the release point. The SF6 measuring mechanism includes an SF6 gas detector and a tripod, with the SF6 gas detector mounted on the tripod. The SF6 measuring mechanism is used to monitor the SF6 concentration in real time at the measuring point.

2. The air leakage measuring device for goaf areas according to claim 1, characterized in that, A threaded groove is provided at the center of one end of the gas storage tank, and one end of the gas outlet pipe is located in the threaded groove, with the end of the gas outlet pipe connected to the atmosphere.

3. The air leakage measuring device for goaf areas according to claim 1, characterized in that, A piston groove is provided at the center of the rear cover of the gas tank. A piston is installed in the piston groove and can slide relative to the piston groove. A gap is left between the piston and the piston groove.

4. The air leakage measuring device for goaf areas according to claim 3, characterized in that, The rear cover of the gas storage tank is provided with an air inlet and an air outlet, both of which are connected to the piston groove. A one-way inflation valve is installed on the air inlet; The air outlet is connected to a hose, and a momentary switch is installed on the hose.

5. The air leakage measuring device for goaf areas according to claim 3, characterized in that, One end of the piston is equipped with a sealing rubber, and the end of the piston equipped with the sealing rubber is close to the other end of the air outlet pipe.

6. The air leakage measuring device for goaf areas according to claim 1, characterized in that, A pressure gauge is also installed on the edge of the rear cover of the gas tank to determine the pressure inside the gas tank.

7. The air leakage measuring device for goaf areas according to claim 1, characterized in that, The tripod includes a ball head, waist loop, clamp, and support frame; The SF6 gas detector is placed on a gimbal, with waist loops located on the front and rear sides of the gimbal, and the waist loops are equipped with straps for securing the SF6 gas detector. The clamping plates are located on the left and right sides of the gimbal, and the clamping plates are designed to be retractable. The support frame is located at the bottom of the gimbal.

8. The air leakage measuring device for goaf areas according to claim 7, characterized in that, The support frame includes a main frame, a connecting frame, and a base frame; The top of the main frame is fixed to the bottom of the gimbal, and the main frame is configured as a telescopic structure. The base frame consists of three parts, with the same end of each part connected to the same position circumferentially on the main frame. Each base frame has an anti-slip pad installed on the other end. Each base frame is designed to be telescopic. The connecting frame is configured as three, with the same end of the three connecting frames connected to the same position circumferentially at the bottom of the main frame; the other end of each connecting frame is connected to a corresponding base frame.

9. The air leakage measuring device for goaf areas according to claim 1, characterized in that, The release point is located near the corner of the air intake alley; The measurement points are set to multiple locations, with the first and last measurement points located in the intake airway and return airway, respectively. The distance between the first measurement point and the release point is ≥20m, and the distance between the first and last measurement points and the intake and return air corners is ≥10m, respectively.

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