Positioning system in tunnel

Abstract

The utility model discloses a positioning system in a tunnel, which relates to the technical field of tunnel construction informatization, and comprises a control terminal, a first wireless network bridge, a second wireless network bridge, at least two positioning base stations and a positioning card, the second wireless bridges are in communication connection with the first wireless bridges, the at least two positioning base stations are electrically connected with the second wireless bridges, and the positioning card is in communication connection with the at least two second wireless bridges. A worker in the tunnel carries the positioning card, the positioning card receives the positioning signals transmitted by the at least two positioning base stations, position information of the positioning card is obtained according to the time difference of receiving the positioning signals and then is fed back to the positioning base stations, and the position information is transmitted back to the control terminal through the second wireless network bridge and the first wireless network bridge. And long-distance wireless transmission of positioning signals is realized. Positioning signals are transmitted in the tunnel, interference of obstacles such as concrete and rocks is avoided, and accurate positioning of workers in the tunnel is achieved.

Description

Technical Field

[0001] This utility model relates to the field of information technology in tunnel construction, and in particular to a positioning system for tunnels. Background Technology

[0002] During the construction of long and large tunnels, as the excavation progresses, geological conditions become increasingly complex and changeable, harboring numerous potential safety hazards. These potential dangers can trigger various emergencies at any time, posing a serious threat to the lives and health of workers. For example, emergencies such as sudden water inrush, mudslides, roof collapses, sidewall collapses, or fires may occur inside the tunnel. Therefore, accurately determining the location and condition of workers inside the tunnel in emergency situations is crucial for accident prevention and emergency response.

[0003] However, in the unique geographical environment of tunnels, traditional positioning technologies are often severely hampered by obstacles such as concrete and rocks, and the positioning signal attenuates significantly as the tunnel lengthens, thus affecting the accuracy of positioning. Against this backdrop, how to achieve precise positioning of personnel inside tunnels has become an urgent problem to be solved. Utility Model Content

[0004] The main purpose of this invention is to propose a tunnel positioning system, which aims to achieve accurate positioning of workers inside the tunnel.

[0005] To achieve the above objectives, the tunnel positioning system includes a control terminal, a first wireless bridge, a second wireless bridge, at least two positioning base stations, and a positioning card. The first wireless bridge is electrically connected to the control terminal, the second wireless bridge is communicatively connected to the first wireless bridge, the at least two positioning base stations are electrically connected to the second wireless bridge, and the positioning card is communicatively connected to the at least two positioning base stations.

[0006] In one embodiment, the positioning card includes a communication module, a main control module, a storage module, a power supply module, and a housing; the communication module, the storage module, and the power supply module are all electrically connected to the main control module; the housing forms a receiving cavity, and the communication module, the main control module, the storage module, and the power supply module are all housed within the receiving cavity.

[0007] In one embodiment, the positioning card further includes an alarm button, which is slidably disposed within the housing and electrically connected to the main control module.

[0008] In one embodiment, the positioning card further includes a protective film that covers the outer surface of the alarm button and the outer surface of the housing and is bonded to the housing.

[0009] In one embodiment, a guide rail is further formed on the housing, and a first engaging portion is formed on the guide rail; the tunnel positioning system further includes a safety helmet, a through groove is formed on the safety helmet, a guide groove is formed on the inner sidewall of the through groove, and a second engaging portion is formed on the inner wall of the guide groove; the positioning clip is accommodated in the through groove, the guide rail is accommodated in the guide groove and slidably connected to the inner wall of the guide groove; the guide rail can slide along the inner wall of the guide groove to engage the first engaging portion with the second engaging portion.

[0010] In one embodiment, one of the first latching portion and the second latching portion is a protrusion, and the other is a groove adapted to the protrusion.

[0011] In one embodiment, the positioning card further includes two wearing rings, which are respectively disposed on opposite sides of the housing; the positioning card also includes a fixing strap, which is connected to the two wearing rings respectively.

[0012] In one embodiment, the control terminal includes a server, a display, a storage device, and an input device, wherein the display, the storage device, and the input device are all electrically connected to the server, and the server is electrically connected to the first wireless bridge.

[0013] In one embodiment, the tunnel positioning system further includes a monitoring camera electrically connected to the second wireless bridge; and / or, the tunnel positioning system further includes an environmental monitor electrically connected to the second wireless bridge, the environmental monitor including at least one of a methane detection sensor, a carbon monoxide detection sensor, and a dust detection sensor.

[0014] In one embodiment, the tunnel positioning system includes a plurality of second wireless bridges connected in sequence, wherein one second wireless bridge is communicatively connected to the first wireless bridge; each second wireless bridge is electrically connected to a positioning base station.

[0015] This utility model discloses a tunnel positioning system comprising a control terminal, a first wireless bridge, a second wireless bridge, at least two positioning base stations, and a positioning card. The first wireless bridge is electrically connected to the control terminal, the second wireless bridge is communicatively connected to the first wireless bridge, the at least two positioning base stations are electrically connected to the second wireless bridge, and the positioning card is communicatively connected to the at least two second wireless bridges. The control terminal can be located outside the tunnel, the first wireless bridge can be located outside the tunnel or at the tunnel entrance, and the second wireless bridge and positioning base stations are located inside the tunnel. Workers inside the tunnel carry positioning cards. The positioning cards receive positioning signals transmitted by at least two positioning base stations. Based on the time difference of the received positioning signals, the positioning card's location information is obtained and fed back to the positioning base stations. This information is then transmitted back to the control terminal via the second and first wireless bridges, achieving long-distance wireless transmission of positioning signals. Because the positioning signals are transmitted inside the tunnel, interference from obstacles such as concrete and rocks is avoided, improving the quality and accuracy of the positioning signals and enabling precise positioning of workers inside the tunnel. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the tunnel positioning system provided by this utility model when applied in a tunnel;

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the positioning card provided by this utility model;

[0019] Figure 3 for Figure 2 A cross-sectional view along line A-A' when the center positioning card is mounted on the safety helmet;

[0020] Figure 4 for Figure 3 A partial schematic diagram of a safety helmet;

[0021] Figure 5 for Figure 2 A cross-sectional view along line B-B' when the center positioning card is mounted on the safety helmet;

[0022] Figure 6 A schematic diagram of another embodiment of the positioning card provided by this utility model;

[0023] Figure 7 This is a schematic diagram illustrating the composition of the positioning card provided by this utility model.

[0024] Explanation of icon numbers:

[0025] 100. Tunnel positioning system;

[0026] 1. Control terminal;

[0027] 2. First wireless bridge;

[0028] 3. Second wireless bridge;

[0029] 4. Locating the base station;

[0030] 5. Positioning card; 51. Housing; 51a. Receiving cavity; 52. Communication module; 53. Main control module; 54. Storage module; 55. Power supply module; 56. Alarm button; 57. Protective film; 58. Guide rail; 581. First locking part; 591. Wearing ring; 592. Fixing strap;

[0031] 6. Safety helmet; 6a. Through groove; 6b. Guide groove; 6b1. Second snap-fit ​​part;

[0032] 7. Surveillance cameras;

[0033] 8. Environmental monitoring instruments;

[0034] 201. Tunnel portal wall; 202. Working face.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] This utility model proposes a positioning system 100 for use in tunnels.

[0040] Please see Figure 1 In one embodiment of the present invention, the tunnel positioning system 100 includes a control terminal 1, a first wireless bridge 2, a second wireless bridge 3, at least two positioning base stations 4, and a positioning card 5. The first wireless bridge 2 is electrically connected to the control terminal 1, the second wireless bridge 3 is communicatively connected to the first wireless bridge 2, the at least two positioning base stations 4 are electrically connected to the second wireless bridge 3, and the positioning card 5 is communicatively connected to the at least two positioning base stations 4.

[0041] In this embodiment, the control terminal 1 is located outside the tunnel. Control terminal 1 processes and stores the location information transmitted from inside the tunnel and displays the location distribution of all construction personnel inside the tunnel. Control terminal 1 may include a server, a display, and a storage device. The server processes the data transmitted from inside the tunnel, the display visually shows the real-time dynamic distribution information of construction personnel inside the tunnel to monitoring personnel, and the storage device permanently stores the data for later viewing and tracing. The first wireless bridge 2 can be located outside the tunnel or at the tunnel entrance and connected to the control terminal 1. The second wireless bridge 3 is located inside the tunnel and communicates with the first wireless bridge 2. That is, the first wireless bridge 2 and the second wireless bridge 3 communicate via wireless signals. The second wireless bridge 3 is connected to at least two positioning base stations 4, which can be connected to the second wireless bridge 3 via cables. The positioning base station 4 can be installed on the sidewall or top wall of the tunnel. The positioning base station 4 can transmit positioning signals. Construction workers wearing positioning cards 5 enter the tunnel. The positioning card 5 can receive positioning signals transmitted by two or more positioning base stations 4. By calculating the time and time difference of the received positioning signals, the positioning card 5 calculates its location within the tunnel and sends the result back to the positioning base station 4. This information is then transmitted to the control terminal 1 via the second wireless bridge 3 and the first wireless bridge 2. Alternatively, the positioning card 5 can be more lightweight. It records the time and time difference of the received positioning signals, sends the result back to the positioning base station 4, and transmits the information to the control terminal 1 via the second wireless bridge 3 and the first wireless bridge 2. The control terminal 1 then calculates the location information of the positioning card 5.

[0042] The tunnel positioning system 100 of this embodiment includes a control terminal 1, a first wireless bridge 2, a second wireless bridge 3, at least two positioning base stations 4, and a positioning card 5. The first wireless bridge 2 is electrically connected to the control terminal 1, the second wireless bridge 3 is communicatively connected to the first wireless bridge 2, the at least two positioning base stations 4 are electrically connected to the second wireless bridge 3, and the positioning card 5 is communicatively connected to the at least two second wireless bridges 3. The control terminal 1 can be located outside the tunnel, the first wireless bridge 2 can be located outside the tunnel or at the tunnel entrance, and the second wireless bridge 3 and positioning base stations 4 are located inside the tunnel. Personnel inside the tunnel carry the positioning card 5. The positioning card 5 receives positioning signals transmitted by at least two positioning base stations 4. Based on the time difference of the received positioning signals, the positioning card 5 obtains its location information and feeds it back to the positioning base stations 4. This information is then transmitted back to the control terminal 1 via the second wireless bridge 3 and the first wireless bridge 2, achieving long-distance wireless transmission of positioning signals. Because the positioning signal is transmitted inside the tunnel, interference from obstacles such as concrete and rocks is avoided, improving the quality and accuracy of the positioning signal and achieving precise positioning of personnel inside the tunnel.

[0043] Please see Figure 7In one embodiment of the present invention, the positioning card 5 includes a communication module 52, a main control module 53, a storage module 54, a power supply module 55, and a housing 51; the communication module 52, the storage module 54, and the power supply module 55 are all electrically connected to the main control module 53; the housing 51 forms a receiving cavity 51a, in which the communication module 52, the main control module 53, the storage module 54, and the power supply module 55 are all received.

[0044] In this embodiment, the housing 51 serves to protect the communication module 52, the main control module 53, the storage module 54, and the power supply module 55. For ease of assembly, the housing 51 can be constructed from two or more parts, such as an upper cover and a lower cover, forming a cavity 51a between them. Considering that the positioning card 5 is exposed to the tunnel construction environment, water or dust may easily enter the cavity 51a, affecting the operation of the modules within. Therefore, a sealing structure such as a sealing ring can be installed between the upper and lower covers.

[0045] The communication module 52 is a component in the positioning card 5 used for sending and receiving wireless signals. It enables data communication between the positioning card 5 and the positioning base station 4, transmitting location information and receiving commands, as well as receiving positioning signals transmitted by the positioning base station 4. The communication module 52 may include a signal transmitter and a signal receiver. The communication module 52 can use an RFID module, supporting standards such as ISO / IEC 14443 and ISO / IEC 15693. Alternatively, the communication module 52 can use a Bluetooth module (especially a BLE module), supporting Bluetooth 4.0 and above standards.

[0046] The main control module 53 is the core processing unit of the positioning card 5, responsible for processing and calculating data to obtain the position information of the positioning card 5. In addition, the main control module 53 is also responsible for controlling the operation of the communication module 52, the storage module 54, and the power supply module 55. The main control module 53 can be an STM32 series microcontroller or an ESP32 / ESP8266 module, etc.

[0047] Storage module 54 stores the data and programs required for the operation of positioning card 5. Power supply module 55 provides the necessary power to positioning card 5, ensuring its continuous and stable operation. Power supply module 55 includes a battery and power management circuitry. Storage module can be an EEPROM module, FRAM module, or SD card. Considering the lightweight and miniaturized design of positioning card 5, communication module 52, main control module 53, storage module 54, and power supply module 55 can be integrated onto a single circuit board and housed within receiving cavity 51a. Power supply module 55 may include a wired rechargeable battery or a wireless rechargeable battery.

[0048] Further, please refer to Figure 2 andFigure 6 In one embodiment of the present invention, the positioning card 5 further includes an alarm button 56, which is slidably disposed in the housing 51 and electrically connected to the main control module 53.

[0049] In this embodiment, the communication module 52, main control module 53, storage module 54, power supply module 55, and alarm button 56 can be integrated onto a single circuit board and housed within the receiving cavity 51a. The alarm button 56 is electrically connected to the main control module 53 via the circuit board. A through-hole is provided on the housing 51, through which the alarm button 56 protrudes and is exposed outside the housing 51, allowing construction personnel to press the button. After the alarm button 56 is pressed, the main control module 53 controls the communication module 52 to send an alarm signal to the control terminal 1. Thus, when construction personnel discover safety hazards or dangers within the tunnel, they can promptly alert the monitoring personnel at the control terminal 1, enabling them to take proactive measures, such as activating an emergency evacuation plan.

[0050] Further, please refer to Figure 2 and Figure 6 In one embodiment of the present invention, the positioning card 5 further includes a protective film 57, which covers the outer surface of the alarm button 56 and the outer surface of the housing 51 and is bonded to the housing 51.

[0051] In this embodiment, a through hole is provided on the housing 51, through which the alarm button 56 is exposed outside the housing 51. There is a gap between the alarm button 56 and the inner wall of the through hole. Considering that the positioning card 5 is exposed to the tunnel construction environment, water or dust may easily enter the receiving cavity 51a, affecting the operation of the modules inside the receiving cavity 51a. Therefore, a protective film 57 is provided to cover the outer surface of the alarm button 56 and the outer surface of the housing 51 and is bonded to the housing 51. The protective film 57 can undergo a certain degree of flexible deformation to meet the needs of pressing the alarm button 56. In this way, the sealing performance of the positioning card 5 is improved while ensuring the normal operation of the alarm button 56.

[0052] Further, please refer to Figures 2 to 5 In one embodiment of the present invention, a guide rail 58 is formed on the housing 51, and a first engaging portion 581 is formed on the guide rail 58; the tunnel positioning system 100 also includes a safety helmet 6, a through groove 6a is formed on the safety helmet 6, a guide groove 6b is formed on the inner side wall of the through groove 6a, and a second engaging portion 6b1 is formed on the inner wall of the guide groove 6b; the positioning card 5 is accommodated in the through groove 6a, and the guide rail 58 is accommodated in the guide groove 6b and slidably connected to the inner wall of the guide groove 6b; the guide rail 58 can slide along the inner wall of the guide groove 6b so that the first engaging portion 581 engages with the second engaging portion 6b1.

[0053] In this embodiment, considering force balance, a guide rail 58 is formed on each of the opposite sides of the shell 51, and a first engaging portion 581 is provided on the guide rail 58. A through groove 6a is formed on the safety helmet 6 to accommodate the positioning card 5. Guide grooves 6b are formed on the two opposite inner sidewalls of the through groove 6a, and a second engaging portion 6b1 is provided on the inner wall of the guide groove 6b. The positioning card 5 can slide into the through groove 6a from both ends. When the positioning card 5 is fully slid into the through groove 6a, the first engaging portion 581 engages with the second engaging portion 6b1. The first engaging portion 581 and the second engaging portion 6b1 can respectively employ mutually cooperating elastic buckles and slots. Thus, the positioning card 5 can be detachably installed on the safety helmet 6. Compared to wearing it by hanging it around the neck with a rope or placing it in a pocket, the method of wearing the safety helmet 6 by sliding and engaging with the track is less likely to be lost and avoids affecting the normal construction work of the workers. This also ensures the accuracy of the location distribution information of each construction worker when the positioning system 100 inside the tunnel displays the location information.

[0054] Further, please refer to Figures 2 to 5 In one embodiment of the present invention, one of the first latching portion 581 and the second latching portion 6b1 is a protrusion, and the other is a groove adapted to the protrusion.

[0055] In this embodiment, the housing 51 of the positioning card 5, the guide rail 58, and the safety helmet 6 are all made of a hard plastic material with a certain degree of elasticity, such as PC or ABS. The guide rail 58 has protrusions, and the sidewall of the through groove 6a has grooves. When the positioning card 5 is fully slid into the through groove 6a, the protrusions and grooves engage. It is understood that a protrusion could also be provided on the inner wall of the through groove 6a, and a groove could be provided on the guide rail 58. Using a protrusion and groove engagement method to achieve the engagement between the positioning card 5 and the inner wall of the through groove 6a is simple, easy to implement, and convenient to operate.

[0056] Further, please refer to Figure 6 In one embodiment of the present invention, the positioning card 5 further includes two wearing rings 591, which are respectively disposed on opposite sides of the housing 51; the positioning card 5 also includes a fixing strap 592, which is respectively connected to the two wearing rings 591.

[0057] In this embodiment, a wearing ring 591 is provided on each of the opposite side walls of the positioning card 5. The wearing ring 591 can be connected to a lanyard to hang around the neck of the construction worker. Considering that some construction workers perform work that requires large movements, hanging it around the neck may affect the construction operation. Therefore, two wearing rings 591 are provided, along with a fixing strap 592. The fixing strap 592 can be made of elastic band, wrist strap, or arm strap, etc., and can be worn on the wrist or arm of the construction worker to avoid affecting the construction operation. In this embodiment, the positioning card 5 can be hung around the neck with a lanyard or worn on the wrist or arm with the fixing strap 592. In this way, the construction worker can choose the wearing method as needed to avoid affecting the construction operation.

[0058] Furthermore, in one embodiment of the present invention, the control terminal 1 includes a server, a display, a storage device, and an input device. The display, the storage device, and the input device are all electrically connected to the server, and the server is electrically connected to the first wireless bridge 2.

[0059] In this embodiment, the control terminal 1 includes a server, a display, a storage device, and input devices. These components can be installed in a dedicated room or control room outside the tunnel entrance. The server is electrically connected to the first wireless bridge 2 and can receive location information from each positioning card 5 transmitted by the second wireless bridge 3. Operators can configure and manage the server using input devices (such as a keyboard and mouse) and the display. The server is equipped with an operating system and control software to collect, process, and display location data from each positioning card 5 within the tunnel, and to display a real-time map of personnel locations within the tunnel on the display. The storage device stores historical location data for later analysis and retrieval.

[0060] Further, please refer to Figure 1 In one embodiment of the present invention, the tunnel positioning system 100 further includes a monitoring camera 7, which is electrically connected to the second wireless bridge 3; and / or; the tunnel positioning system 100 further includes an environmental monitor 8, which is electrically connected to the second wireless bridge 3, and the environmental monitor 8 includes at least one of a methane detection sensor, a carbon monoxide detection sensor, and a dust detection sensor.

[0061] In this embodiment, a monitoring camera 7 and / or an environmental monitoring device 8 can also be installed in the tunnel. The monitoring camera 7 can monitor the construction environment inside the tunnel in real time. Combined with the distribution information of construction personnel provided by the positioning card 5, the situation of the construction site inside the tunnel can be remotely and promptly grasped. For example, in the event of an emergency, the type of accident and the safety status of personnel can be quickly identified. The environmental monitoring device 8 includes at least one of the following: a methane detection sensor (such as an MQ-2 sensor), a carbon monoxide detection sensor (such as an MQ-7 sensor), and a dust detection sensor (such as a Sharp GP2Y1010AU0F sensor). Installing the environmental monitoring device 8 in the tunnel can promptly detect whether there are toxic or flammable gases in the tunnel. Combined with the location distribution information of construction personnel, it can promptly remind nearby construction personnel to evacuate.

[0062] Further, please refer to Figure 1 In one embodiment of the present invention, the tunnel positioning system 100 includes a plurality of second wireless bridges 3 connected in sequence, wherein one second wireless bridge 3 is communicatively connected to a first wireless bridge 2; each second wireless bridge 3 is electrically connected to a positioning base station 4.

[0063] In this embodiment, considering that in some long and large tunnels, due to the considerable length of the tunnel and the potential for curvature, multiple second wireless bridges 3 can be installed along the tunnel and connected sequentially. The second wireless bridge 3 closest to the first wireless bridge 2 is connected to the first wireless bridge 2. For example, the first wireless bridge 2 can be installed near the tunnel portal wall 201 at the tunnel entrance, and the second wireless bridges 3 can be spaced apart on the sidewalls or top walls of the tunnel along the direction from the tunnel portal wall 201 to the working face 202. Each second wireless bridge 3 is configured with and connected to a positioning base station 4, thus dividing the tunnel into multiple working areas. Each area is located between two adjacent positioning base stations 4. After construction personnel enter the tunnel wearing positioning cards 5, the positioning cards 5 receive the positioning signals emitted by the positioning base stations 4 in the corresponding area, calculate the location information, and feed it back to the positioning base stations 4. This information is then fed back to the control terminal 1 via the second wireless bridges 3 and the first wireless bridge 2. By controlling the density of the divided areas, the effective coverage of the positioning base station 4's signal can be ensured, guaranteeing that each area has good signal strength.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A positioning system for use in tunnels, characterized in that, The tunnel positioning system includes: Control terminal (1); The first wireless bridge (2) is electrically connected to the control terminal (1); The second wireless bridge (3) is communicatively connected to the first wireless bridge (2); At least two positioning base stations (4), at least two of the positioning base stations (4) are electrically connected to the second wireless bridge (3); and The positioning card (5) is communicatively connected to at least two of the positioning base stations (4).

2. The tunnel positioning system as described in claim 1, characterized in that, The positioning card (5) includes a communication module (52), a main control module (53), a storage module (54), a power supply module (55), and a housing (51); The communication module (52), the storage module (54), and the power supply module (55) are all electrically connected to the main control module (53); The housing (51) has a receiving cavity (51a) in which the communication module (52), the main control module (53), the storage module (54) and the power supply module (55) are all housed.

3. The tunnel positioning system as described in claim 2, characterized in that, The positioning card (5) also includes an alarm button (56), which is slidably inserted through the housing (51) and electrically connected to the main control module (53).

4. The tunnel positioning system as described in claim 3, characterized in that, The positioning card (5) also includes a protective film (57), which covers the outer surface of the alarm button (56) and the outer surface of the housing (51) and is bonded to the housing (51).

5. The tunnel positioning system as described in claim 2, characterized in that, A guide rail (58) is also formed on the housing (51), and a first snap-fit ​​portion (581) is formed on the guide rail (58); The tunnel positioning system also includes a safety helmet (6), on which a through groove (6a) is formed, and a guide groove (6b) is formed on the inner sidewall of the through groove (6a), and a second snap-fit ​​part (6b1) is formed on the inner wall of the guide groove (6b). The positioning card (5) is accommodated in the through groove (6a), and the guide rail (58) is accommodated in the guide groove (6b) and is slidably connected to the inner wall of the guide groove (6b); The guide rail (58) can slide along the inner wall of the guide groove (6b) to engage the first snap-fit ​​part (581) with the second snap-fit ​​part (6b1).

6. The tunnel positioning system as described in claim 5, characterized in that, In the first latching portion (581) and the second latching portion (6b1), one is a protrusion and the other is a groove adapted to the protrusion.

7. The tunnel positioning system as described in claim 2, characterized in that, The positioning card (5) also includes two wearing rings (591), which are respectively disposed on opposite sides of the housing (51); The positioning card (5) also includes a fixing strap (592), which is connected to the two wearing rings (591) respectively.

8. The tunnel positioning system as described in any one of claims 1 to 7, characterized in that, The control terminal (1) includes a server, a display, a storage device, and an input device. The display, the storage device, and the input device are all electrically connected to the server, and the server is electrically connected to the first wireless bridge (2).

9. The tunnel positioning system as described in any one of claims 1 to 7, characterized in that, The tunnel positioning system also includes a monitoring camera (7), which is electrically connected to the second wireless bridge (3); And / or; the tunnel positioning system further includes an environmental monitoring instrument (8), which is electrically connected to the second wireless bridge (3), and the environmental monitoring instrument (8) includes at least one of a methane detection sensor, a carbon monoxide detection sensor and a dust detection sensor.

10. The tunnel positioning system according to any one of claims 1 to 7, characterized in that, The tunnel positioning system includes multiple second wireless bridges (3) connected in sequence, wherein one of the second wireless bridges (3) is communicatively connected to the first wireless bridge (2); Each of the second wireless bridges (3) is electrically connected to one of the positioning base stations (4).

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