Intelligent fire extinguishing device for highway tunnel

Abstract

The invention discloses a highway tunnel intelligent fire extinguishing device which comprises a fire hydrant main pipe, the fire hydrant main pipe is connected with an automatic water spraying device branch pipe, the automatic water spraying device branch pipe is provided with a butterfly valve, a filtering device and an electromagnetic valve, and the end of the automatic water spraying device branch pipe is connected with an intelligent spray head. The intelligent spray head is connected with an image type fire detector with an infrared flame detection function, and the water spray angle of the intelligent spray head can be adjusted. The intelligent fire extinguishing device can automatically detect a fire source point and extinguish fire through an image type fire detector of the intelligent fire extinguishing device, and can also be automatically started to extinguish fire after linkage of a fire alarm system, so that the fire extinguishing efficiency of the tunnel is greatly improved. The device can realize the application of an automatic water-spraying fire-extinguishing system for the mountain road tunnel, and can spray mixed liquid or water in time aiming at a fire hazard point through the system before fire rescue personnel arrive, so that the purposes of cooling, fire control and fire extinguishing are achieved; and fire and smoke spreading is avoided, the main body structure of the tunnel is effectively protected, and good conditions are created for personnel escape and rescue.

Description

Technical Field

[0001] The present invention relates to a fire extinguishing device, and more specifically, to an intelligent fire extinguishing device for highway tunnels. Background Art

[0002] Highway tunnels are an essential part of highway engineering. Currently, the commonly used fire extinguishing devices in highway tunnel fire protection systems include: fire hydrants, aqueous film-forming foam fire extinguishing devices, fire extinguishers, etc. These fire extinguishing devices all rely on manual operation for fire extinguishing. However, due to lack of training, drivers and passengers usually cannot use these fire extinguishing devices correctly, making it difficult to achieve good fire extinguishing effects. Professional management personnel or fire rescue personnel are required to operate these devices well and achieve the purpose of fire extinguishing. Since it takes a certain amount of time for management personnel or fire rescue personnel to discover a fire and reach the scene, they cannot control and extinguish the fire in a timely manner.

[0003] The fire protection water consumption of the existing automatic sprinkler fire extinguishing system is large. When adding the water consumption of the fire hydrant system, the volume of the fire protection water tank is very large. The system needs to be equipped with water spray pumps and foam liquid pumps, which requires more building land and increases the construction cost.

[0004] It is necessary to separately install water spray main pipes (mostly with a diameter of DN250 or DN300), foam liquid main pipes (mostly with a diameter of DN80), foam / water spray branch pipes, etc., resulting in the need to increase the tunnel trench or building clearance, increasing the construction difficulty and cost.

[0005] The system needs to additionally set up a valve box (market price is about 30,000 yuan per unit) about 20 - 25m on one side in the tunnel and a sprinkler head about every 5m, with high costs.

[0006] The nozzle diameters of foam / water spray systems and fine water mist systems are small, easy to clog, and have high requirements for water quality. Summary of the Invention

[0007] An object of the present invention is to provide a new technical solution for an intelligent fire extinguishing device for highway tunnels.

[0008] According to the first aspect of the present invention, an intelligent fire extinguishing device for highway tunnels is provided, including a dry hydrant pipe. An automatic sprinkler device branch pipe is connected to the dry hydrant pipe. A butterfly valve, a filtering device and a solenoid valve are installed on the automatic sprinkler device branch pipe. The end of the automatic sprinkler device branch pipe is connected to an intelligent sprinkler head. An image-type fire detector with infrared flame detection function is connected to the intelligent sprinkler head. The intelligent sprinkler head can adjust the spraying angle. A first aqueous film forming foam liquid suction pipe is connected to the automatic sprinkler device branch pipe. One end of the first aqueous film forming foam liquid suction pipe is connected to an aqueous film forming foam liquid container. A first proportioning mixer is installed on the automatic sprinkler device branch pipe. A first liquid outlet valve is installed on the first aqueous film forming foam liquid suction pipe. A control box and a fire alarm system are also included.

[0009] Optionally, the intelligent sprinkler head includes a housing. A sprinkler elbow is installed inside the housing. A metal sleeve is sleeved outside the bending part of the sprinkler elbow. A first stepping motor is fixedly connected to the housing. The output shaft of the first stepping motor is fixedly connected to the metal sleeve. A stretchable bellows is fixedly connected to the lower part of the sprinkler elbow. A sprinkler is fixedly connected to the end of the sprinkler elbow. A notch part is formed on the housing.

[0010] Optionally, a rotating pipe is fixedly connected to the lower part of the stretchable bellows. The rotating pipe is rotatably connected to a connecting sleeve through an annular plate. The lower part of the connecting sleeve is connected to the automatic sprinkler device branch pipe through a flange. A second stepping motor is connected to the connecting sleeve. A first gear is connected to the end of the output shaft of the second stepping motor. A second gear is fixedly connected to the rotating pipe.

[0011] Optionally, the fire alarm system is electrically connected to the control box. The control box is respectively connected to the solenoid valve and the first liquid outlet valve.

[0012] Optionally, the intelligent sprinkler head is electrically connected to the image-type fire detector with infrared flame detection function. Motor drive chips are respectively connected inside the first stepping motor and the second stepping motor.

[0013] Optionally, the dry hydrant pipe is arranged in the tunnel fire trench. An inspection road cover plate is provided on the upper part of the tunnel fire trench. A branch pipe groove is formed on the tunnel wall. A fire protection box body is fixedly connected to the tunnel wall. A hydrant branch pipe is connected to the dry hydrant pipe.

[0014] Optionally, a maintenance butterfly valve and a hydrant are connected to the hydrant branch pipe. A first drain valve is connected to the hydrant branch pipe through a connecting pipe. The first drain valve is connected to a second proportioning mixer through a connecting pipe. A hose reel is connected to the end of the second proportioning mixer. A foam spray gun is connected to the hose reel.

[0015] Optionally, a second aqueous film-forming foam liquid suction pipe is connected between the second proportion mixer and the aqueous film-forming foam liquid container, and a second liquid outlet valve is connected to the second aqueous film-forming foam liquid suction pipe.

[0016] Optionally, a fire hose, a fire extinguisher and a fire nozzle are provided inside the fire box.

[0017] Optionally, a drain pipe is connected to the branch pipe of the automatic sprinkler device, and a second drain valve is installed on the drain pipe.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] 1. In terms of function: The intelligent fire extinguishing device in the present invention can detect the fire source point by itself through the built-in image-type fire detector and extinguish the fire, or can be automatically started to extinguish the fire after being linked by the fire alarm system, greatly improving the efficiency of tunnel fire extinguishing. The device can realize the application of the automatic sprinkler fire extinguishing system for mountain highway tunnels. Before the arrival of fire fighting and rescue personnel, the system can spray the mixed liquid or water in a timely manner against the fire point to achieve the purposes of cooling, controlling the fire and extinguishing the fire, avoiding the spread of fire and smoke, effectively protecting the main structure of the tunnel, and creating better conditions for the escape and rescue of personnel.

[0020] 2. In terms of economy: Compared with the foam / water spray system widely used in domestic urban traffic tunnels at present, the present invention does not require the installation of water spray main pipes, foam liquid main pipes along the whole line of the tunnel, one spray head is set about every 5m, one valve box with a width of about 1.2m × a height of about 1.2m is set every 20 - 25m, and does not require the additional installation of complex and expensive equipment facilities such as water spray pumps and foam liquid pumps. In addition, the fire fighting water volume of the foam / water spray system is large, resulting in a large volume of the fire fighting water tank and occupying a large amount of land. Generally speaking, the system of the present invention is relatively simple, with a low cost, saving the space of the tunnel, reducing land acquisition, and having good economy.

[0021] 3. In terms of construction: Since the addition of equipment facilities for installing the intelligent fire extinguishing device of the present invention along the whole line of the tunnel is not much, the construction of the present invention is relatively simple.

[0022] 4. In terms of maintenance: A filtering device is provided at the front end of the intelligent fire extinguishing device, and the particle size of the spray head is relatively large, which can be well applied to mountain highway tunnels with poor water source quality, and has the characteristics of being easy to disassemble, not easy to block, and convenient for maintenance.

[0023] Other features and advantages of the present invention will become clear through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0024] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 Schematic diagram of the overall structure of an intelligent fire extinguishing device for a highway tunnel in one embodiment;

[0026] Figure 2 Schematic diagram of the structure of an intelligent sprinkler head of an intelligent fire extinguishing device for a highway tunnel in one embodiment;

[0027] Figure 3 Schematic diagram of the connection structure between the rotating pipe and the connecting sleeve of the intelligent sprinkler head of an intelligent fire extinguishing device for a highway tunnel in one embodiment;

[0028] Figure 4 Schematic diagram of the internal structure of the intelligent sprinkler head of an intelligent fire extinguishing device for a highway tunnel in one embodiment;

[0029] Figure 5 Schematic diagram of the fire alarm system of an intelligent fire extinguishing device for a highway tunnel in one embodiment;

[0030] Figure 6 Schematic diagram of the control box of an intelligent fire extinguishing device for a highway tunnel in one embodiment.

[0031] The labels in the figure are as follows: 1, fire ditch; 2, inspection road cover plate; 3, dry fire hydrant pipe; 4, branch pipe groove; 5, fire hydrant branch pipe; 6, inspection butterfly valve; 7, fire hydrant; 8, foam spray gun; 9, second aqueous film forming foam liquid suction pipe; 10, second liquid outlet valve; 11, first drain valve; 12, second proportioning mixer; 13, hose reel; 14, aqueous film forming foam liquid container; 15, fire protection box body; 16, fire hose; 17, water gun; 18, fire extinguisher; 19, automatic sprinkler device branch pipe; 20, drain pipe; 21, solenoid valve; 22, first aqueous film forming foam liquid suction pipe; 23, first liquid outlet valve; 24, first proportioning mixer; 25, butterfly valve; 26, filtering device; 27, intelligent sprinkler head; 271, housing; 272, first stepping motor; 273, sprinkler head; 274, notch part; 275, connecting sleeve; 276, image type fire detector with infrared flame detection function; 277, flange; 278, rotating pipe; 2781, annular plate; 2782, second gear; 279, first gear; 2710, stretchable bellows; 2711, sprinkler head elbow; 2712, metal sleeve; 2713, second stepping motor; 28, control box. Detailed implementation manners

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention, its application, or use.

[0034] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered as part of the specification.

[0035] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0036] As Figure 1-6 shown, a highway tunnel intelligent fire extinguishing device connects an automatic sprinkler device branch pipe 19 from a dry fire hydrant pipe 3 installed in a tunnel fire trench 1 and lays it along the tunnel sidewall to a height of about 5 m above the building limit and above the inspection road cover plate;

[0037] A butterfly valve 25, a filtering device 26, and a solenoid valve 21 are installed on the automatic sprinkler device branch pipe 19. The end of the automatic sprinkler device branch pipe 19 is connected to an intelligent sprinkler head 27. An image-type fire detector 276 with an infrared flame detection function is connected to the intelligent sprinkler head 27, and the intelligent sprinkler head 27 can adjust the spraying angle.

[0038] When it is necessary to repair or disassemble the automatic sprinkler device branch pipe 19, the water in the branch pipe can be emptied first through a second drain valve. The solenoid valve 21 and the first liquid outlet valve 23 are normally closed, and the pipe behind the solenoid valve 21 is normally an empty pipe.

[0039] A first aqueous film-forming foam liquid suction pipe 22 is connected to the automatic sprinkler device branch pipe 19. One end of the first aqueous film-forming foam liquid suction pipe 22 is connected to an aqueous film-forming foam liquid container 14. A first proportioning mixer 24 is installed on the automatic sprinkler device branch pipe 19. A first liquid outlet valve 23 is installed on the first aqueous film-forming foam liquid suction pipe 22. A control box 28 and a fire alarm system are also included.

[0040] The intelligent sprinkler head 27 includes a housing 271. Inside the housing 271, a sprinkler elbow 2711 is installed. A metal sleeve 2712 is sleeved on the outer side of the bending part of the sprinkler elbow 2711. A first stepping motor 272 is fixedly connected to the housing 271. The output shaft of the first stepping motor 272 is fixedly connected to the metal sleeve 2712. A stretchable corrugated pipe 2710 is fixedly connected to the lower part of the sprinkler elbow 2711. A sprinkler head 273 is fixedly connected to the end of the sprinkler elbow 2711. A notch part 274 is formed on the housing 271.

[0041] The lower part of the stretchable corrugated pipe 2710 is fixedly connected to a rotating pipe 278. The rotating pipe 278 is rotatably connected to a connecting sleeve 275 through an annular plate 2781. The lower part of the connecting sleeve 275 is connected to the branch pipe 19 of the automatic sprinkler device through a flange 277. A second stepping motor 2713 is connected to the connecting sleeve 275. The end of the output shaft of the second stepping motor 2713 is connected to a first gear 279. A second gear 2782 is fixedly connected to the rotating pipe 278.

[0042] The fire alarm system is electrically connected to the control box 28. The control box 28 is respectively connected to the solenoid valve 21 and the first liquid outlet valve 23.

[0043] The fire alarm system includes an ARM processor, a 256G - EMMC storage, a 16G - RAM, a display, a buzzer and a network port module.

[0044] The control box 28 includes a main control PLC, an analog quantity output module, a digital quantity output module, a communication gateway and a bus terminal.

[0045] The model of the main control PLC is Siemens S7 - 1200. The analog quantity output module is connected to the first liquid outlet valve 23. The digital quantity output module is connected to an Omron G5V - 2 - H1 relay group. The Omron G5V - 2 - H1 relay group is connected to the solenoid valve 21. The communication gateway is connected to the intelligent sprinkler head 27.

[0046] The intelligent sprinkler head 27 is electrically connected to an image - type fire detector 276 with an infrared flame detection function. Motor drive chips are respectively connected inside the first stepping motor 272 and the second stepping motor 2713.

[0047] The fire hydrant main pipe 3 is arranged in the tunnel fire ditch 1. An inspection road cover plate 2 is provided on the upper part of the tunnel fire ditch 1. A branch pipe groove 4 is formed on the tunnel wall. A fire box 15 is fixedly connected to the tunnel wall. A fire hydrant branch pipe 5 is connected to the fire hydrant main pipe 3.

[0048] The fire hydrant branch pipe 5 is connected to a maintenance butterfly valve 6 and a fire hydrant 7. The fire hydrant branch pipe 5 is connected to a first drain valve 11 through a connecting pipe. The first drain valve 11 is connected to a second proportioning mixer 12 through a connecting pipe. The end of the second proportioning mixer 12 is connected to a hose reel 13, and the hose reel 13 is connected to a foam spray gun 8.

[0049] A second aqueous film-forming foam liquid suction pipe 9 is connected between the second proportioning mixer 12 and the aqueous film-forming foam liquid container 14 , and a second liquid outlet valve 10 is connected to the second aqueous film-forming foam liquid suction pipe 9 .

[0050] A water hose 16 , a fire extinguisher 18 and a water gun 17 are arranged inside the fire fighting box 15 .

[0051] The branch pipe 19 of the automatic sprinkler device is connected with a drain pipe 20 , and a second drain valve is installed on the drain pipe 20 .

[0052] Working principle: When a fire occurs, the image-type fire detector that comes with the smart sprinkler can detect the fire source by itself, or the fire alarm system can be used to find the fire point and link the control box of the smart fire extinguishing device closest to the fire point to start the smart sprinkler and detect the fire. The image-type fire detector of the smart sprinkler forms a three-dimensional positioning coordinate for the fire source when detecting the fire, and feeds the coordinates back to the control box. Through logical judgment and signal conversion, the control box gives the sprinkler a signal instruction, requiring it to automatically adjust the angle up and down and left and right to accurately locate the fire position. At the same time, the control box uploads the fire source information to the control center. After manual confirmation by the control center, the control box at the fire point is given a signal to open the solenoid valve 21 and the first liquid outlet valve 23. The water fills the upper part of the branch pipe 19 of the automatic sprinkler device. At the same time, the foam liquid is sucked out from the water-film-forming foam liquid container 14 through negative pressure suction. The water and the water-film-forming foam liquid form a foam mixture after passing through the proportioning mixer to the smart sprinkler 27, and the sprinkler starts to spray. During spraying, the intelligent nozzle 27 forms a certain fan-shaped spraying range to cover the fire source through horizontal swing. The first 5 minutes or so sprays a mixture of foam liquid and water. After the foam liquid is consumed, the nozzle continues to spray water.

[0053] In some embodiments: if two smart sprinklers 27 are turned on during a fire, one sprinkler is the main sprinkler and the other sprinkler is the auxiliary sprinkler. The image-type fire detector of the main sprinkler detects the three-dimensional coordinates of the fire source and transmits the coordinates of the fire source to the control box of the auxiliary sprinkler through its control box, and controls the auxiliary sprinkler to coordinate fire extinguishing.

[0054] It should be noted that in the above program, the control box uploads the fire source information to the control center. After manual confirmation by the control center, a signal is sent to the control box at the fire point to open the solenoid valve 21 and the first liquid outlet valve 23. If there is no manual confirmation within one minute after the fire point is detected, the system will automatically jump to automatically execute the linkage to start the control box at the fire point, open the solenoid valve 21 and the first liquid outlet valve 23, and then carry out fire extinguishing by spraying.

[0055] The device can also be started remotely directly by the control center, manually on-site, etc. Its main functions are to cool down and control the fire, but it can also extinguish the fire by means of pressing and smashing the fire source with gravitational potential energy, isolating the air of the fire source, etc. The device can realize the application of the automatic sprinkler fire extinguishing system for mountain highway tunnels. Before the arrival of the fire fighting and rescue personnel, the system can spray the mixed liquid or water in a timely manner for the fire point through this system to achieve the purposes of cooling down, controlling the fire and extinguishing the fire, avoiding the spread of the fire and smoke, effectively protecting the main structure of the tunnel, and creating better conditions for the escape and rescue of personnel.

[0056] The core components of the device include the dry fire hydrant pipe 3 and the automatic sprinkler device branch pipe 19 connected thereto. The dry fire hydrant pipe 3 is usually arranged in the tunnel fire trench 1 and is connected to the fire fighting system in the tunnel to ensure sufficient and stable water source.

[0057] On the automatic sprinkler device branch pipe 19, a plurality of key components are installed to work together. The butterfly valve 25 is normally open and only needs to be closed during maintenance; the filtering device 26 is used to filter impurities in the water source to protect the subsequent components from being blocked; the solenoid valve 21 can be quickly opened after receiving a control signal to allow water to enter the automatic sprinkler device branch pipe 19.

[0058] The end of the automatic sprinkler device branch pipe 19 is connected to the intelligent sprinkler 27, which is the key execution component of the fire extinguishing device. The intelligent sprinkler 27 can receive and process the fire source information from the image-type fire detector 276 with infrared flame detection function. According to the position and intensity of the fire source, the water spraying angle and direction of the sprinkler elbow 2711 are adjusted by controlling the first stepping motor 272 and the second stepping motor 2713 to ensure that the water flow can accurately cover the fire source.

[0059] To enhance the fire extinguishing effect, the device also introduces aqueous film-forming foam liquid. The first aqueous film-forming foam liquid suction pipe 22 sucks the foam liquid from the aqueous film-forming foam liquid container 14 and mixes it with the water flow in the automatic sprinkler device branch pipe 19 through the first proportioning mixer 24 to form a foam mixed liquid. In this process, the first liquid outlet valve 23 is responsible for controlling the outflow of the foam liquid to ensure the accuracy of the mixing ratio.

[0060] When a fire occurs, the fire alarm system first detects the fire source and issues an alarm. Subsequently, the control box 28 receives the alarm signal, and the image-type fire detector built into the intelligent sprinkler 27 starts to detect the three-dimensional coordinates of the fire source point by itself and feeds the coordinates back to the control box. Through logical judgment and signal conversion, the control box gives a signal instruction to the sprinkler to automatically adjust the angle up, down, left, and right to accurately locate the fire position. At the same time, the control box uploads the fire source information to the control center. After manual confirmation by the control center, a signal is given to the control box at the fire point to open the solenoid valve 21 and the first liquid outlet valve 23. Water fills the upper part of the automatic sprinkler device branch pipe 19 upwards, and at the same time, foam liquid is sucked out from the aqueous film-forming foam liquid container 14 through negative pressure suction. The water and the aqueous film-forming foam liquid form a foam mixture after passing through the proportioning mixer and reach the intelligent sprinkler 27. The sprinkler starts to spray the foam mixture to cover and suffocate the fire.

[0061] In addition, the device is also equipped with a manual control function. Inside the fire protection box body 15, the operator can manually open the maintenance butterfly valve 6 to use the fire hydrant 7 for fire extinguishing, or use the hose reel 13 and the foam spray gun 8 for auxiliary fire extinguishing. The combination of the second proportioning mixer 12 and the second aqueous film-forming foam liquid suction pipe 9 provides support for this manual fire extinguishing method.

[0062] In terms of maintenance and repair, the drain pipe 20 and the second drain valve on it allow the operator to drain and clean the automatic sprinkler device branch pipe 19 without affecting the normal operation of the tunnel.

[0063] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An intelligent fire extinguishing device for a highway tunnel, comprising a fire hydrant main pipe (3), characterized in that: The fire hydrant main pipe (3) is connected to an automatic water spray device branch pipe (19), and a butterfly valve (25), a filter device (26) and a solenoid valve (21) are installed on the automatic water spray device branch pipe (19). The end of the automatic water spray device branch pipe (19) is connected to an intelligent nozzle (27), and the intelligent nozzle (27) is connected to an image-type fire detector (276) with an infrared flame detection function. The intelligent nozzle (27) can adjust the water spray angle. The automatic water spray device branch pipe (19) is connected to a first water film-forming foam liquid suction pipe (22), and one end of the first water film-forming foam liquid suction pipe (22) is connected to a water film-forming foam liquid container (14). The automatic water spray device branch pipe (19) is installed with a first proportioning mixer (24), and the first water film-forming foam liquid suction pipe (22) is installed with a first liquid outlet valve (23). It also includes a control box (28) and a fire alarm system.

2. The intelligent fire extinguishing device for a highway tunnel according to claim 1, characterized in that: The intelligent nozzle (27) comprises a shell (271), a nozzle elbow (2711) is installed inside the shell (271), a metal sleeve (2712) is sleeved on the outer side of the bent portion of the nozzle elbow (2711), a first stepper motor (272) is fixedly connected to the shell (271), an output shaft of the first stepper motor (272) is fixedly connected to the metal sleeve (2712), a stretchable bellows (2710) is fixedly connected to the lower part of the nozzle elbow (2711), a nozzle (273) is fixedly connected to the end of the nozzle elbow (2711), and a notch (274) is provided on the shell (271).

3. The intelligent fire extinguishing device for a highway tunnel according to claim 2 is characterized in that: The lower part of the stretchable bellows (2710) is fixedly connected to a rotating tube (278), and the rotating tube (278) is rotatably connected to the connecting sleeve (275) through an annular plate (2781). The lower part of the connecting sleeve (275) is connected to the branch pipe (19) of the automatic sprinkler device through a flange (277). The connecting sleeve (275) is connected to a second stepper motor (2713), and the end of the output shaft of the second stepper motor (2713) is connected to a first gear (279). The rotating tube (278) is fixedly connected to a second gear (2782).

4. The intelligent fire extinguishing device for a highway tunnel according to claim 3 is characterized in that: The fire alarm system is electrically connected to a control box (28), and the control box (28) is respectively connected to the electromagnetic valve (21) and the first liquid outlet valve (23).

5. The intelligent fire extinguishing device for a highway tunnel according to claim 4, characterized in that: The intelligent nozzle (27) is electrically connected to an image-type fire detector (276) with an infrared flame detection function, and the first stepper motor (272) and the second stepper motor (2713) are respectively connected to motor drive chips.

6. The intelligent fire extinguishing device for a highway tunnel according to claim 1, characterized in that: The fire hydrant main pipe (3) is arranged in a tunnel fire trench (1), an inspection road cover plate (2) is arranged on the upper part of the tunnel fire trench (1), a branch pipe groove (4) is opened on the tunnel wall, a fire fighting box (15) is fixedly connected to the tunnel wall, and a fire hydrant branch pipe (5) is connected to the fire hydrant main pipe (3).

7. The intelligent fire extinguishing device for a highway tunnel according to claim 6, characterized in that: The fire hydrant branch pipe (5) is connected to a maintenance butterfly valve (6) and a fire hydrant (7); the fire hydrant branch pipe (5) is connected to a first drain valve (11) via a connecting pipe; the first drain valve (11) is connected to a second proportioning mixer (12) via a connecting pipe; the end of the second proportioning mixer (12) is connected to a hose reel (13); and the hose reel (13) is connected to a foam spray gun (8).

8. The intelligent fire extinguishing device for a highway tunnel according to claim 7, characterized in that: A second aqueous film-forming foam liquid suction pipe (9) is connected between the second proportioning mixer (12) and the aqueous film-forming foam liquid container (14), and a second liquid outlet valve (10) is connected to the second aqueous film-forming foam liquid suction pipe (9).

9. The intelligent fire extinguishing device for a highway tunnel according to claim 6, characterized in that: A water hose (16), a fire extinguisher (18) and a water gun (17) are arranged inside the fire fighting box (15).

10. The intelligent fire extinguishing device for a highway tunnel according to claim 1, characterized in that: The branch pipe (19) of the automatic water spraying device is connected to a water discharge pipe (20), and a second water discharge valve is installed on the water discharge pipe (20).

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