A tunnel gas monitoring system and its monitoring method

Abstract

This invention belongs to the field of tunnel gas monitoring technology, specifically a tunnel gas monitoring system and method, including a ground central station, tunnel substations, sensors, and controllers. The ground central station is used to set, display, and store tunnel environmental parameters in real time, and analyze and process these parameters, triggering an alarm program when gas levels exceed the standard. The tunnel substations provide power to the sensors, receive sensor data, and transmit the data to the ground central station via communication lines. By measuring the gas parameters inside the tunnel using methane sensors, wind speed sensors, and carbon monoxide sensors installed inside, and feeding this information back to the ground central station for analysis and processing, an automatic audible and visual alarm is triggered when gas levels exceed the standard. The system then automatically cuts off power to the controlled equipment via a power supply circuit breaker, thereby enabling timely and accurate all-day, all-round monitoring of the gas conditions at each working face inside the tunnel, achieving the goal of safe tunnel production.

Description

Technical Field

[0001] This invention belongs to the field of tunnel gas monitoring technology, specifically a tunnel gas monitoring system and its monitoring method. Background Technology

[0002] Tunnels may be subject to accidents such as gas asphyxiation, gas combustion, gas explosion, and poisoning by harmful gases, which can cause serious harm to the lives and property of tunnel construction workers and result in significant losses to the tunnel construction period and investment.

[0003] Currently, during tunnel construction, it is impossible to monitor changes in the environment inside and outside the tunnel in real time, making it impossible to provide early warnings and take timely technical measures to reduce safety risks during construction. This poses a risk to the lives and property of tunnel construction workers. To address this, the present invention provides a tunnel gas monitoring system and its monitoring method. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a tunnel gas monitoring system according to the present invention, including a ground central station, a tunnel substation, sensors and controllers;

[0006] The ground central station is used to set, display and store the environmental parameters of the tunnel in real time, analyze and process the environmental parameters, and activate the alarm program when the gas level exceeds the standard.

[0007] The tunnel substation is used to provide power to the sensors and receive sensor data, and transmit the data to the ground central station through communication lines.

[0008] The sensors and controllers include methane sensors, hydrogen sulfide sensors, carbon monoxide sensors, temperature sensors, and wind speed sensors, used to monitor methane, hydrogen sulfide, carbon monoxide, carbon dioxide, temperature, and wind speed. The sensors and controllers also include a power supply disconnector, used to receive power outage signals from the substation in abnormal situations, cutting off the tunnel's operating power to prevent accidents. During operation, the system measures the gas parameters inside the tunnel using methane, wind speed, and carbon monoxide sensors installed inside, and feeds this information back to the ground control station for analysis and processing. It implements wind power-gas interlocking and airflow control for gas, wind speed, airflow, and the main ventilation fans. If gas levels exceed the standard, automatic audible and visual alarms are triggered by the sensors inside the tunnel and the monitoring center outside the tunnel. The system also automatically cuts off power to the controlled equipment through equipment start / stop sensors and the power supply disconnector. The system can provide timely and accurate all-day, all-round monitoring of the gas conditions at each working face inside the tunnel, achieving the goal of safe tunnel production.

[0009] Preferably, the methane sensor is externally fixed with a support frame, the top of which is fixedly connected to the tunnel arch, and the distance between the methane sensor and the tunnel arch is 20 centimeters. During operation, the methane sensor is suspended 20 centimeters below the tunnel arch, which facilitates wind-facing detection and also prevents damage to the methane sensor during operations such as walking on the platform.

[0010] Preferably, a transmission rod is rotatably connected inside the support frame, a rotating frame is fixed outside the transmission rod, a rotating fan blade is fixed outside the rotating frame, and multiple support rods are fixed inside the rotating frame. The pair of support rods furthest from the tunnel arch contains hollow spheres, each containing multiple impact balls. A pair of arc-shaped baffles are located on the side of each hollow sphere furthest from the transmission rod, and these arc-shaped baffles are fixedly connected to the support rods. During operation, if the methane concentration in the tunnel becomes too high, it indicates a leak of stored methane, causing an increase in airflow velocity within the tunnel. At this time, the rotating fan blades will accelerate under the influence of the airflow. The rotating fan blades drive the internal support rod to rotate. As the support rod rotates, the hollow sphere inside is subjected to centrifugal force. Due to the high airflow velocity, the centrifugal force on the hollow sphere is significant, until the hollow sphere causes the arc-shaped baffle to bend. This prevents the arc-shaped baffle from obstructing the hollow sphere. After the hollow sphere separates from the arc-shaped baffle, it rolls inside the support rod. The impact balls inside collide rapidly with each other under the action of inertia, producing a loud sound to alert the tunnel staff to an abnormal gas level and the need for immediate evacuation. This achieves the effect of an automatic alarm when gas escapes.

[0011] Preferably, a squeezing plate is provided on the side of the hollow sphere near the transmission rod. A pair of return springs are fixed between the squeezing plate and the transmission rod, and a guide rod is provided between the pair of return springs. One end of the guide rod is fixedly connected to the squeezing plate, and the other end of the guide rod is provided with a liquid storage bladder. A drain pipe is installed at the bottom of the liquid storage bladder, and the drain pipe is connected to the transmission rod. During operation, as the support rod rotates, the squeezing plate stretches the return springs under the action of centrifugal force, causing them to deform and drive the guide rod to move, thereby pushing the hollow sphere to separate from the arc-shaped baffle, preventing the arc-shaped baffle from jamming the hollow sphere. When the gas in the tunnel is treated to restore its concentration to normal, the squeezing plate will reset under the action of the return springs. During this process, the squeezing plate will push the guide rod to squeeze the liquid storage bladder. After being compressed, the liquid storage bladder will spray out the air freshener stored inside through the drain pipe, facilitating subsequent tunnel operations by employees.

[0012] Preferably, an air storage bladder is provided on the side of the arc-shaped baffle away from the transmission rod. The air storage bladder is filled with oxygen. The end of the air storage bladder away from the transmission rod is fixedly connected to the rotating frame. A pin is provided inside the air storage bladder. The pin is fixedly connected to the rotating frame. An exhaust hole is opened at the bottom of the support rod. A telescopic tube is fixed between the exhaust hole and the rotating frame. A duct is fixed to the end of the telescopic tube away from the support rod. The duct is connected to the rotating frame. During operation, after the hollow ball separates from the arc-shaped baffle, it will collide with the air storage bladder under the action of centrifugal force, pushing the air storage bladder to deform until it contacts the pin. Then the pin will puncture the air storage bladder, thereby causing the oxygen stored inside the air storage bladder to be ejected. The ejected oxygen will flow into the telescopic tube through the exhaust hole, and then be discharged into the tunnel through the duct, increasing the oxygen concentration in the tunnel, diluting the gas, and helping the personnel in the tunnel to evacuate.

[0013] Preferably, a pressure relief valve is installed inside the exhaust port and the drain pipe, a whistle is installed inside the air guide pipe, and multiple shaking balls are provided on the outside of the ejector pin. An elastic bent rod is fixed between the shaking balls and the ejector pin. During operation, as oxygen is discharged through the air guide pipe, it flows through the whistle, causing it to vibrate and produce a sound, further reminding the construction personnel in the tunnel to evacuate in time. At the same time, after the hollow ball comes into contact with the ejector pin, the shaking balls on the outside of the ejector pin will collide with the hollow ball to produce a sound, thereby achieving the effect of reminding employees to evacuate in time.

[0014] Preferably, a pair of reflective balls are provided at the bottom of the rotating frame and outside the air duct. An elastic sheet is fixed between the reflective balls and the rotating frame. During operation, as oxygen is discharged through the air duct, the airflow will also blow the reflective balls, causing the elastic sheet to bend and swing back and forth. During this process, the reflective balls will irregularly reflect external light, reminding employees to evacuate and also serving as a wayfinding tool.

[0015] Preferably, a drive shaft is installed at the top of the transmission rod, and a drive assembly is installed at the top of the drive shaft. The drive assembly is used to drive the drive shaft to rotate. A pair of slots are opened inside the transmission rod and outside the drive shaft. A pair of magnetic blocks are slidably connected inside the drive shaft. The magnetic blocks are adapted to the slots. An electromagnet is provided on one side of the pair of magnetic blocks that are close to each other. A locking spring is fixed between the electromagnet and the magnetic blocks. The electromagnet and the magnetic blocks are magnetically compatible. In operation, in the initial state, the electromagnet is energized to apply an attractive force to the magnetic blocks, thereby causing the magnetic blocks to compress the locking spring and move until the locking spring is completely separated from the slot. If the gas concentration exceeds the standard, the power supply to the electromagnet can be turned off to demagnetize it. Then, the magnetic blocks will reset under the action of the spring force and re-lock into the slot. Then, the drive assembly is started to drive the drive shaft to rotate, which in turn drives the transmission rod to rotate. This drives the rotating fan blade to rotate, which accelerates the airflow in the tunnel and increases the centrifugal force on the hollow sphere, further preventing the hollow sphere from being unable to move due to insufficient centrifugal force.

[0016] Preferably, one of the air reservoirs contains a stimulating liquid, and an atomizing nozzle is fixed to the outside of the air duct corresponding to the air reservoir. During operation, after the air reservoir is punctured, the stimulating liquid inside the air reservoir is atomized and sprayed out through the atomizing nozzle. The sprayed stimulating liquid mixes with the air to help employees stay alert and assist them in evacuating from the tunnel. The stimulating liquid is a liquid with a stimulating effect, such as medicated oil.

[0017] A method for monitoring tunnel gas, applicable to any of the tunnel gas monitoring systems described above, comprising the following steps:

[0018] S1. Methane sensors, wind speed sensors, carbon monoxide sensors, etc., installed inside the cave are used to measure the gas parameters inside the cave.

[0019] S2. The ground control station receives and analyzes gas parameters.

[0020] S3. Once the gas level exceeds the standard, an automatic alarm will be triggered, and the controlled equipment will be automatically powered off via the power supply circuit breaker.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The tunnel gas monitoring system and method described in this invention measure gas parameters inside the tunnel by installing methane sensors, wind speed sensors, carbon monoxide sensors, etc., and feed this information back to the ground central station for analysis and processing. When the gas level exceeds the standard, an automatic audible and visual alarm is triggered, and the controlled equipment is automatically powered off by a power supply circuit breaker. This allows for timely and accurate all-day, all-round monitoring of the gas conditions at each working face inside the tunnel, achieving the goal of safe tunnel production.

[0023] 2. The tunnel gas monitoring system and method described in this invention utilize the airflow during the process of oxygen being discharged through the gas duct to blow a reflective ball, causing the elastic sheet to bend and swing back and forth. During this process, the reflective ball irregularly reflects external light, reminding employees to evacuate while also serving as a wayfinding indicator. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a system framework diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the tunnel arch structure in this invention;

[0027] Figure 3 This is the present invention. Figure 2 Enlarged view of a portion of point A in the middle;

[0028] Figure 4 This is the present invention. Figure 3 Enlarged view of a section at point B in the middle;

[0029] Figure 5 This is the present invention. Figure 3 Enlarged view of a section at point C;

[0030] Figure 6 This is a schematic diagram of the second embodiment of the rotating frame structure in this invention;

[0031] Figure 7 This is the present invention. Figure 6 Enlarged view of a section at point D;

[0032] Figure 8 This is a flowchart of the method of the present invention.

[0033] In the diagram: 1. Tunnel arch; 2. Support frame; 3. Methane sensor; 4. Rotating frame; 5. Transmission rod; 6. Rotating fan blade; 7. Support rod; 8. Hollow ball; 9. Impact ball; 10. Arc-shaped baffle; 11. Squeezing plate; 12. Return spring; 13. Guide rod; 14. Liquid reservoir; 15. Gas reservoir; 16. Pin; 17. Telescopic tube; 18. Air duct; 19. Pressure relief valve; 20. Whistle; 21. Elastic sheet; 22. Reflective ball; 23. Shaking ball; 24. Elastic bending rod; 25. Drive shaft; 26. Drive assembly; 27. Slot; 28. Magnetic block; 29. ​​Electromagnet; 30. Snap-fit ​​spring; 31. Atomizing nozzle. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] Example 1

[0036] like Figure 1 As shown in the figure, a tunnel gas monitoring system and method according to an embodiment of the present invention includes a ground central station, a tunnel substation, sensors, and a controller;

[0037] The ground central station is used to set, display and store the environmental parameters of the tunnel in real time, analyze and process the environmental parameters, and activate the alarm program when the gas level exceeds the standard.

[0038] The tunnel substation is used to provide power to the sensors and receive sensor data, and transmit the data to the ground central station through communication lines.

[0039] The sensors and controller include a methane sensor 3, a hydrogen sulfide sensor, a Co sensor, a Co2 sensor, a temperature sensor, and a wind speed sensor, used to monitor methane, hydrogen sulfide, carbon monoxide, carbon dioxide, temperature, and wind speed. The sensors and controller also include a power supply disconnector, used to receive power outage signals from the substation in abnormal situations, cutting off the tunnel's operating power to prevent accidents. During operation, the system measures the gas parameters inside the tunnel using the methane sensor 3, wind speed sensor, and carbon monoxide sensor installed inside the tunnel, and feeds this information back to the ground center station for analysis and processing. It implements wind power-gas interlocking and airflow control for gas, wind speed, airflow, and the main ventilation fans inside the tunnel. If gas levels exceed the standard, automatic audible and visual alarms are triggered by the sensors inside the tunnel and the monitoring center outside the tunnel. The system also automatically cuts off power to the controlled equipment through equipment start / stop sensors and the power supply disconnector. The system can provide timely and accurate all-day, all-round monitoring of the gas conditions at each working face inside the tunnel, achieving the goal of safe tunnel production.

[0040] like Figures 2 to 3 As shown, the methane sensor 3 is externally fixed with a support frame 2, the top of the support frame 2 is fixedly connected to the tunnel arch 1, and the distance between the methane sensor 3 and the tunnel arch 1 is 20 centimeters. During operation, the methane sensor 3 is suspended 20 centimeters below the tunnel arch 1 to facilitate wind detection, and also to prevent damage to the methane sensor 3 during operations such as walking platform construction.

[0041] like Figures 3 to 4As shown, a transmission rod 5 is rotatably connected inside the support frame 2. A rotating frame 4 is fixed outside the transmission rod 5, and a rotating fan blade 6 is fixed outside the rotating frame 4. Multiple support rods 7 are fixed inside the rotating frame 4. Hollow spheres 8 are installed inside the pair of support rods 7 furthest from the tunnel arch 1. Multiple impact balls 9 are installed inside the hollow spheres 8. A pair of arc-shaped baffles 10 are installed on the side of the hollow spheres 8 furthest from the transmission rod 5. The arc-shaped baffles 10 are fixedly connected to the support rods 7. During operation, if the gas concentration in the tunnel is too high, it indicates that the gas stored in the tunnel is leaking, which causes the airflow velocity in the tunnel to increase. At this time, the rotating fan blade 6 will accelerate under the action of the airflow. The rotating fan blade 6 rotates, causing its internal support rod 7 to rotate. When the support rod 7 rotates, the hollow ball 8 inside it is subjected to centrifugal force. Because the airflow speed is too fast at this time, the centrifugal force on the hollow ball 8 is large, until the hollow ball 8 causes the arc-shaped baffle 10 to bend under the action of centrifugal force, so that the arc-shaped baffle 10 no longer blocks the hollow ball 8. After the hollow ball 8 separates from the arc-shaped baffle 10, it will roll inside the support rod 7. As a result, the impact ball 9 inside it will collide rapidly with each other under the action of inertial force, thus producing a loud sound to remind the employees in the tunnel that there is an abnormal gas and that they need to evacuate in time, thereby achieving the effect of automatic alarm when gas escapes.

[0042] like Figure 4 As shown, a pressing plate 11 is provided on the side of the hollow sphere 8 near the transmission rod 5. A pair of return springs 12 are fixed between the pressing plate 11 and the transmission rod 5. A guide rod 13 is provided between the pair of return springs 12. One end of the guide rod 13 is fixedly connected to the pressing plate 11, and the other end of the guide rod 13 is provided with a liquid storage bladder 14. A drain pipe is installed at the bottom of the liquid storage bladder 14, and the drain pipe is connected to the transmission rod 5. During operation, as the support rod 7 rotates, the pressing plate 11 will be subjected to centrifugal force. The stretching return spring 12 deforms and drives the guide rod 13 to move, thereby pushing the hollow ball 8 to separate from the arc-shaped baffle 10, preventing the arc-shaped baffle 10 from jamming the hollow ball 8. When the gas in the tunnel is treated to restore its concentration to normal, the squeezing plate 11 will be reset under the action of the return spring 12. During this process, the squeezing plate 11 will push the guide rod 13 to squeeze the liquid storage bladder 14. After being compressed, the liquid storage bladder 14 will spray the air freshener stored inside through the drain pipe to facilitate subsequent tunnel operations by employees.

[0043] like Figure 4As shown, an air reservoir 15 is provided on the side of the arc-shaped baffle 10 away from the transmission rod 5. The air reservoir 15 is filled with oxygen. The end of the air reservoir 15 away from the transmission rod 5 is fixedly connected to the rotating frame 4. A ejector pin 16 is provided inside the air reservoir 15 and is fixedly connected to the rotating frame 4. An exhaust hole is opened at the bottom of the support rod 7. A telescopic tube 17 is fixed between the exhaust hole and the rotating frame 4. An air guide tube 18 is fixed to the end of the telescopic tube 17 away from the support rod 7. The air guide tube 18 is connected to the rotating frame. 4. Through connection; During operation, after the hollow ball 8 separates from the arc-shaped baffle 10, it will collide with the air storage bag 15 under the action of centrifugal force, and push the air storage bag 15 to deform until it comes into contact with the ejector pin 16. Then the ejector pin 16 will puncture the air storage bag 15, so that the oxygen stored inside the air storage bag 15 will be ejected. The ejected oxygen will flow into the telescopic pipe 17 through the exhaust hole, and then be discharged into the tunnel through the air guide pipe 18, increasing the oxygen concentration in the tunnel, diluting the gas, and helping the personnel in the tunnel to evacuate.

[0044] like Figure 4 As shown, pressure relief valves 19 are installed inside the exhaust port and the drain pipe, a whistle 20 is installed inside the air guide pipe 18, and multiple shaking balls 23 are provided on the outside of the ejector pin 16. An elastic bent rod 24 is fixed between the shaking balls 23 and the ejector pin 16. During operation, as oxygen is discharged through the air guide pipe 18, it flows through the whistle 20, causing it to vibrate and produce a sound, further reminding the construction personnel in the tunnel to evacuate in time. At the same time, after the hollow ball 8 comes into contact with the ejector pin 16, the shaking balls 23 on the outside of the ejector pin 16 will collide with the hollow ball 8 to produce a sound, thereby achieving the effect of reminding employees to evacuate in time.

[0045] like Figure 4 As shown, a pair of reflective balls 22 are provided at the bottom of the rotating frame 4 and outside the air duct 18. An elastic sheet 21 is fixed between the reflective balls 22 and the rotating frame 4. During operation, as oxygen is discharged through the air duct 18, the airflow will also blow the reflective balls 22, causing the elastic sheet 21 to bend and swing back and forth. During this process, the reflective balls 22 will irregularly reflect external light, reminding employees to evacuate and also serving as a wayfinding tool.

[0046] like Figure 3 and Figure 5As shown, a drive shaft 25 is mounted on the top of the transmission rod 5, and a drive assembly 26 is mounted on the top of the drive shaft 25. The drive assembly 26 is used to drive the drive shaft 25 to rotate. A pair of slots 27 are provided inside the transmission rod 5 and outside the drive shaft 25. A pair of magnetic blocks 28 are slidably connected inside the drive shaft 25. The magnetic blocks 28 are adapted to the slots 27. An electromagnet 29 is provided on one side of the pair of magnetic blocks 28 that are close to each other. A locking spring 30 is fixed between the electromagnet 29 and the magnetic blocks 28. The magnetism of the electromagnet 29 and the magnetic blocks 28 is compatible. In operation, the electromagnet is activated in the initial state. When the iron 29 is energized, it applies an attractive force to the magnetic locking block 28, causing the magnetic locking block 28 to compress the locking spring 30 and move until the locking spring 30 is completely separated from the slot 27. If the gas concentration exceeds the standard, the power supply to the electromagnet 29 can be turned off, causing it to lose its magnetism. Then, the magnetic locking block 28 will reset under the action of the elastic force and re-lock into the slot 27. Subsequently, the drive assembly 26 is activated to drive the drive shaft 25 to rotate, which in turn drives the transmission rod 5 to rotate, thereby driving the rotating fan blade 6 to rotate, accelerating the airflow in the tunnel. At the same time, it can also increase the centrifugal force on the hollow ball 8, further preventing the hollow ball 8 from being unable to move due to insufficient centrifugal force.

[0047] Example 2

[0048] like Figures 6 to 7 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: one of the air storage bags 15 contains a refreshing liquid, and the air guide tube 18 corresponding to the air storage bag 15 is fixed with an atomizing nozzle 31 on the outside; during operation, after the air storage bag 15 is punctured, the refreshing liquid inside the air storage bag 15 will be atomized and sprayed out through the atomizing nozzle 31. The sprayed refreshing liquid mixes with the air to help employees refresh themselves and assist them in evacuating from the tunnel. The refreshing liquid is a liquid with a refreshing effect, which can be medicated oil.

[0049] like Figure 8 As shown, a tunnel gas monitoring method is applicable to any of the tunnel gas monitoring systems described above. The method includes the following steps:

[0050] S1. Methane sensor 3, wind speed sensor, carbon monoxide sensor, etc. installed inside the cave to measure the gas parameters inside the cave;

[0051] S2. The ground control station receives and analyzes gas parameters.

[0052] S3. Once the gas level exceeds the standard, an automatic alarm will be triggered, and the controlled equipment will be automatically powered off via the power supply circuit breaker.

[0053] Working principle: The system measures the gas parameters inside the tunnel by installing methane sensors, wind speed sensors, and carbon monoxide sensors. This information is then fed back to the ground center station for analysis and processing. The system implements wind power gas interlock and air volume control for the gas, wind speed, air volume, and main fans inside the tunnel. If the gas exceeds the standard, the system automatically triggers audible and visual alarms at the sensors inside the tunnel and the monitoring center outside the tunnel. The system also automatically cuts off power to the controlled equipment through equipment start / stop sensors and power supply circuit breakers. The system can monitor the gas conditions of each working face inside the tunnel in a timely and accurate manner, achieving the goal of safe tunnel production.

[0054] By suspending the methane sensor 3 20 centimeters below the tunnel arch 1, it is easy for it to detect in the wind, and at the same time, it can prevent the methane sensor 3 from being damaged during operations such as walking platform work.

[0055] When the gas concentration in the tunnel becomes too high, it indicates a gas leak, causing an increase in airflow velocity. The rotating fan blade 6 then accelerates under the influence of this airflow, causing the internal support rod 7 to rotate. During this rotation, the hollow ball 8 inside the support rod 7 experiences centrifugal force. Due to the high airflow velocity, the centrifugal force on the hollow ball 8 is significant, eventually causing the arc-shaped baffle 10 to bend and cease obstructing it. After separating from the baffle 10, the hollow ball 8 rolls inside the support rod 7, causing the internal impact balls 9 to collide rapidly under inertial force, generating a loud sound to alert tunnel staff of the gas abnormality and the need for immediate evacuation. This achieves the effect of an automatic alarm when gas escapes.

[0056] During the rotation of the support rod 7, the squeezing plate 11 will stretch the return spring 12 under the action of centrifugal force, causing it to deform and drive the guide rod 13 to move, thereby pushing the hollow ball 8 to separate from the arc-shaped baffle 10, preventing the arc-shaped baffle 10 from jamming the hollow ball 8. When the gas in the tunnel is treated to restore its concentration to normal, the squeezing plate 11 will reset under the action of the return spring 12. During this process, the squeezing plate 11 will push the guide rod 13 to squeeze the liquid storage bladder 14. After being compressed, the liquid storage bladder 14 will spray out the air freshener stored inside through the drain pipe, which will facilitate the subsequent tunnel operations of the employees.

[0057] After the hollow ball 8 separates from the arc-shaped baffle 10, it will collide with the air storage bag 15 under the action of centrifugal force, pushing the air storage bag 15 to deform until it comes into contact with the ejector pin 16. Then the ejector pin 16 will puncture the air storage bag 15, causing the oxygen stored inside the air storage bag 15 to be ejected. The ejected oxygen will flow into the telescopic pipe 17 through the exhaust hole, and then be discharged into the tunnel through the air guide pipe 18, increasing the oxygen concentration in the tunnel, diluting the gas, and helping the workers in the tunnel to evacuate. During the process of oxygen being discharged through the air guide pipe 18, it will flow through the whistle 20 to vibrate and produce a sound, further reminding the construction workers in the tunnel to evacuate in time. At the same time, after the hollow ball 8 comes into contact with the ejector pin 16, the shaking ball 23 on the outside of the ejector pin 16 will collide with the hollow ball 8 to produce a sound, thereby achieving the effect of reminding the employees to evacuate in time.

[0058] As oxygen is discharged through the duct 18, the airflow will also cause the reflective ball 22 to bend and swing back and forth, causing the elastic sheet 21 to bend. During this process, the reflective ball 22 will irregularly reflect external light, reminding employees to evacuate and also serving as a wayfinding tool.

[0059] In the initial state, the electromagnet 29 is energized to apply an attractive force to the magnetic block 28, causing the magnetic block 28 to compress the locking spring 30 and move until the locking spring 30 is completely separated from the slot 27. After the gas concentration exceeds the standard, the power supply to the electromagnet 29 can be turned off to make it lose its magnetism. Then, the magnetic block 28 will reset under the action of the elastic force and re-lock into the slot 27. Subsequently, the drive assembly 26 is activated to drive the drive shaft 25 to rotate, which in turn drives the transmission rod 5 to rotate, which in turn drives the rotating fan blade 6 to rotate, accelerating the air flow in the tunnel. At the same time, it can also increase the centrifugal force on the hollow ball 8, further preventing the hollow ball 8 from being unable to move due to insufficient centrifugal force.

[0060] After the air reservoir 15 is punctured, the energizing liquid inside the air reservoir 15 will be atomized and sprayed out through the atomizing nozzle 31. The sprayed energizing liquid mixes with the air to help the employees refresh themselves and assist them in evacuating from the tunnel. The energizing liquid is a liquid with an energizing effect, such as medicated oil.

[0061] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0062] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tunnel gas monitoring system, characterized in that: Includes ground central station, tunnel substation, sensors and controllers; The ground central station is used to set, display and store the environmental parameters of the tunnel in real time, analyze and process the environmental parameters, and activate the alarm program when the gas level exceeds the standard. The tunnel substation is used to provide power to the sensors and receive sensor data, and transmit the data to the ground central station through communication lines. The sensors and controller include a methane sensor (3), a hydrogen sulfide sensor, a CO sensor, a CO2 sensor, a temperature sensor, and a wind speed sensor, used to monitor methane, hydrogen sulfide, carbon monoxide, carbon dioxide, temperature, and wind speed; the sensors and controller also include a power supply disconnector, used to receive a power outage signal from the substation in abnormal situations, cut off the working power supply of the tunnel, and prevent accidents from happening. The methane sensor (3) is externally fixed with a support frame (2), the top of the support frame (2) is fixedly connected to the tunnel arch (1), and the distance between the methane sensor (3) and the tunnel arch (1) is 20 centimeters. The support frame (2) is rotatably connected to a transmission rod (5). A rotating frame (4) is fixed to the outside of the transmission rod (5). A rotating fan blade (6) is fixed to the outside of the rotating frame (4). Multiple support rods (7) are fixed inside the rotating frame (4). A hollow ball (8) is provided inside the pair of support rods (7) furthest from the tunnel arch (1). Multiple impact balls (9) are provided inside the hollow ball (8). A pair of arc-shaped baffles (10) are provided on the side of the hollow ball (8) furthest from the transmission rod (5). The arc-shaped baffles (10) are fixedly connected to the support rods (7).

2. The tunnel gas monitoring system according to claim 1, characterized in that: A squeezing plate (11) is provided on the side of the hollow ball (8) near the transmission rod (5). A pair of return springs (12) are fixed between the squeezing plate (11) and the transmission rod (5). A guide rod (13) is provided between the pair of return springs (12). One end of the guide rod (13) is fixedly connected to the squeezing plate (11). A liquid storage bladder (14) is provided at the other end of the guide rod (13). A drain pipe is installed at the bottom of the liquid storage bladder (14). The drain pipe is connected to the transmission rod (5).

3. The tunnel gas monitoring system according to claim 2, characterized in that: An air reservoir (15) is provided on the side of the arc-shaped baffle (10) away from the transmission rod (5). The air reservoir (15) is filled with oxygen. The end of the air reservoir (15) away from the transmission rod (5) is fixedly connected to the rotating frame (4). A pin (16) is provided inside the air reservoir (15). The pin (16) is fixedly connected to the rotating frame (4). An exhaust hole is provided at the bottom of the support rod (7). A telescopic tube (17) is fixed between the exhaust hole and the rotating frame (4). An air guide tube (18) is fixed at the end of the telescopic tube (17) away from the support rod (7). The air guide tube (18) is connected to the rotating frame (4).

4. The tunnel gas monitoring system according to claim 3, characterized in that: The vent and drain pipe are equipped with pressure relief valves (19), the air guide pipe (18) is equipped with a whistle (20), the outside of the ejector pin (16) is provided with multiple shaking balls (23), and an elastic bent rod (24) is fixed between the shaking balls (23) and the ejector pin (16).

5. A tunnel gas monitoring system according to claim 4, characterized in that: A pair of reflective balls (22) are provided at the bottom of the rotating frame (4) and outside the air duct (18), and an elastic sheet (21) is fixed between the reflective balls (22) and the rotating frame (4).

6. A tunnel gas monitoring system according to claim 5, characterized in that: A drive shaft (25) is installed at the top of the transmission rod (5), and a drive assembly (26) is installed at the top of the drive shaft (25). The drive assembly (26) is used to drive the drive shaft (25) to rotate. A pair of slots (27) are provided inside the transmission rod (5) and outside the drive shaft (25). A pair of magnetic blocks (28) are slidably connected inside the drive shaft (25). The magnetic blocks (28) are adapted to the slots (27). An electromagnet (29) is provided on one side of the pair of magnetic blocks (28) that are close to each other. A snap-fit ​​spring (30) is fixed between the electromagnet (29) and the magnetic blocks (28). The magnetism of the electromagnet (29) and the magnetic blocks (28) are adapted.

7. A tunnel gas monitoring system according to claim 6, characterized in that: One of the air reservoirs (15) contains a stimulant, and an atomizing nozzle (31) is fixed to the outside of the air duct (18) corresponding to the air reservoir (15).

8. A method for monitoring tunnel gas, characterized in that: This monitoring method is applicable to the tunnel gas monitoring system according to any one of claims 1-7, and the method includes the following steps: S1. Methane sensor (3), wind speed sensor, carbon monoxide sensor and other parameters installed in the cave are used to measure the gas parameters in the cave. S2. The ground control station receives and analyzes gas parameters. S3. Once the gas level exceeds the standard, an automatic alarm will be triggered, and the controlled equipment will be automatically powered off via the power supply circuit breaker.

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