CN116019280B - A tunnel safety induction intelligent helmet, induction system and induction method - Google Patents
A tunnel safety induction intelligent helmet, induction system and induction method Download PDFInfo
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- CN116019280B CN116019280B CN202211539429.9A CN202211539429A CN116019280B CN 116019280 B CN116019280 B CN 116019280B CN 202211539429 A CN202211539429 A CN 202211539429A CN 116019280 B CN116019280 B CN 116019280B
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Abstract
The invention discloses a tunnel safety induction intelligent helmet, an induction system and an induction method, comprising a helmet body, a laser transmitter and an indicating device, wherein the indicating device comprises a shell, a convex lens and a first reflecting mirror, a through installation cavity is arranged on the shell, the convex lens is installed at one end of the installation cavity, the first reflecting mirror is installed at the other end of the installation cavity, the mirror surface of the first reflecting mirror is positioned at the focus of the convex lens, the laser transmitter transmits laser, and the laser transmitted by the laser transmitter is reflected to the convex lens of the next indicating device through the first reflecting mirror and the second reflecting mirror after converging the convex lens, so that an induction route is formed on the side surface of a tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel induction, in particular to a tunnel safety induction intelligent helmet, an induction system and an induction method.
Background
With the rapid development of expressway construction in China, highway tunnels are more and more, and the occurrence of fire disaster in the tunnels is also gradually increased. The environment in the tunnel is relatively closed, and once a fire disaster occurs, if the fire disaster cannot be extinguished in time, the fire disaster can rapidly spread along with the tunnel, and firefighters need a certain time to reach the fire scene. When fire disaster occurs in the tunnel, the escape indication system in the prior art mostly depends on a mains supply system, and once the fire disaster damages the power system, the escape indication system cannot work normally, and only an emergency indication lamp partially depending on an emergency power supply exists, so that escape indication cannot be performed well.
For example, a tunnel induction system and a tunnel induction method with the application number 2018116057582 comprise a tunnel entrance lamp arranged at a tunnel entrance, a plurality of induction lamps arranged on a tunnel wall, a plurality of car detectors arranged between the induction lamps and a control box. The vehicle guidance system can guide vehicles in and out of the tunnel, help drivers select a more efficient and safe driving mode, reduce the occurrence probability of accidents, and can not guide and instruct the power system to be damaged once the accidents happen in the tunnel.
Disclosure of Invention
In order to solve the technical problems, the invention provides the intelligent helmet, the induction system and the induction method for tunnel safety induction, which are characterized in that laser emitted by a laser emitter is converged by a convex lens and then reflected to the convex lens of the next indicating device through a first reflecting mirror, and an induction route is formed on the side surface of the tunnel, so that the situation that pedestrians cannot be guided normally due to the fact that an electric power system cannot be used when a fire disaster occurs can be prevented.
The invention adopts the following technical scheme:
The intelligent helmet comprises a helmet body, a laser emitter, a second laser emitter, a first laser emitter and a second laser emitter, wherein the upper end of the helmet body is provided with a mounting groove, the laser emitter is arranged in the mounting groove and comprises the first laser emitter which is rotatably arranged on the surface of the mounting groove, the second laser emitter is arranged above the first laser emitter and is rotatably arranged on the surface of the mounting groove, the intelligent helmet is in a first state and a second state, the first laser emitter and the second laser emitter emit laser forwards to measure distance in the first state, and the first laser emitter and the second laser emitter emit laser towards two sides in the second state respectively.
The tunnel safety induction system comprises a tunnel safety induction intelligent helmet and a plurality of indicating devices uniformly arranged on the ground, wherein each indicating device comprises a shell, a convex lens and a first reflecting mirror, a through installation cavity is formed in the shell, the convex lens is installed at one end of the installation cavity, the first reflecting mirror is installed at the other end of the installation cavity, and the mirror surface of the first reflecting mirror is located at the focus of the convex lens.
Preferably, the first reflecting mirror is arranged towards the convex lens of the next indicating device, and the laser emitted by the first laser emitter or the second laser emitter is reflected to the convex lens of the next indicating device through the first reflecting mirror after converging on the convex lens to form an induction route.
Preferably, the first reflecting mirror comprises a first reflecting mirror body and a rotating groove positioned at the back side of the first reflecting mirror body, and the shell is provided with a spherical positioning piece which is embedded into the rotating groove and is in rotating fit with the first reflecting mirror body.
Preferably, the first reflecting mirror surface is provided with a light sensor, and the light sensor is in communication connection with the main controller.
The device comprises a frame, a first reflecting mirror, a second reflecting mirror, a first laser emitter and a second laser emitter, wherein the first reflecting mirror is arranged towards the convex lens of the next indicating device, the second reflecting mirror is arranged towards the second reflecting mirror of the adjacent reflecting device, and laser emitted by the first laser emitter or the second laser emitter is converged by the convex lens and then reflected to the convex lens of the next indicating device through the first reflecting mirror and the second reflecting mirror to form a broken line induction route.
Preferably, a plurality of indicating devices are arranged on two sides of the tunnel, in the second state, the laser emitted by the first laser emitter and the second laser emitter is converged by the convex lens and then reflected to the convex lens of the next indicating device by the first reflecting mirror and the second reflecting mirror, and an induction route is formed on two sides of the tunnel.
A tunnel safety induction method using a tunnel safety induction system includes S100, adjusting a laser emitter to face a convex lens of a nearest indicating device and emitting laser, S200, reflecting the laser to a convex lens of a next indicating device through a first reflecting mirror after converging the laser and forming an induction route, and S300, counting the number of laser reflection times by a main controller to obtain the approximate distance between the current position and a tunnel outlet and providing an induction scheme.
Preferably, in S300, the main controller counts the number of times the light sensor detects the laser light as the number of laser light reflections.
Preferably, in S200, the laser emitted by the laser emitter is converged by the convex lens and then reflected by the first mirror and the second mirror to the convex lens of the next indicating device, so as to form a broken line inducing path.
Compared with the prior art, the invention has the following advantages:
1. The invention provides a tunnel safety induction intelligent helmet, an induction system and an induction method, wherein a laser emitter emits laser, the laser emitted by the laser emitter is reflected to a convex lens of a next indicating device through a first reflecting mirror after converging, an induction route is formed on the side surface of a tunnel, and the situation that a power system cannot be used to guide pedestrians normally when a fire disaster occurs can be prevented.
2. The safety induction intelligent helmet can judge the front terrain by measuring the distance between the first laser emitter and the front road surface through the first laser emitter and the second laser emitter, and is convenient for sensing the front road surface condition when escaping.
3. According to the invention, the first reflecting mirror is arranged towards the second reflecting mirror of the adjacent reflecting device, and the laser emitted by the first laser emitter or the second laser emitter is reflected to the convex lens of the next indicating device through the first reflecting mirror and the second reflecting mirror after converging by the convex lens, so that a broken line inducing route is formed, and the situation that the laser cannot be reflected due to the existence of an obstacle between the two adjacent indicating devices can be avoided.
Drawings
Fig. 1 is a schematic structural view of an intelligent helmet.
Fig. 2 is a schematic structural view of the indicating device.
Fig. 3 is a schematic view of another view structure of the indicating device.
Fig. 4 is a schematic structural diagram of a safety induction system.
Fig. 5 is a schematic structural view of the reflecting device.
FIG. 6 is a schematic structural diagram of another embodiment of a security guidance system.
Fig. 7 is a schematic structural view of another embodiment of the indicating device.
Fig. 8 is a schematic structural view of another embodiment of the indicating device.
In the figure, a helmet body 1, a mounting groove 11, a laser transmitter 2, a first laser transmitter 21, a second laser transmitter 22, an indicating device 3, a housing 31, a focus collimator lens 32, a first reflecting mirror 33, a first reflecting mirror body 331, a rotating groove 332, a spherical positioning member 34, a reflecting device 4, a frame 41, and a second reflecting mirror 42.
Detailed Description
In order to facilitate understanding of the technical scheme of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1 to 4, a tunnel safety induction intelligent helmet includes a helmet body 1, and a laser transmitter 2.
The helmet body 1 is provided with a mounting groove 11 at the upper end, and the middle of the top of the helmet body is provided with a mounting groove which is a conventional structure, such as a helmet structure disclosed in publication No. CN204969644U, because the top of the existing helmet is provided with a lighting device such as an LED lamp.
The laser emitter 2 is arranged in the mounting groove 11 and comprises a first laser emitter 21 and a second laser emitter 22, wherein the first laser emitter 21 is rotatably arranged on the surface of the mounting groove 11, and the second laser emitter 22 is positioned above the first laser emitter 21 and is rotatably arranged on the surface of the mounting groove 11. The existing laser transmitter is a laser module, and is composed of a laser tube and a laser head module, and a remote laser module with a super small divergence angle, such as a VCSEL (vertical cavity surface emitting laser) laser, can be selected according to the length of a tunnel. Since the safety helmet itself usually has an illumination LED lamp, the laser transmitter 2 device itself may be integrated with an LED lamp, as one of the illumination devices disclosed in CN113834038a, on the tubular body, a first laser and a second laser, and an LED device are integrated.
The intelligent helmet is provided with a first state and a second state, in the first state, the first laser transmitter 21 and the second laser transmitter 22 transmit laser forwards to measure distance, the first laser transmitter 21 and the second laser transmitter 22 are laser distance measuring devices, the distance between the front road surface and the intelligent helmet can be measured by the two laser distance measuring devices, whether the front road surface has an obstacle or has fluctuation is judged through the distance, because the distance between the first laser transmitter 21 and the second laser transmitter 22 is smaller, the distance between the road surface and the second laser transmitter 22 is approximately equal, and if the difference value between the road surface and the first laser transmitter is larger, the obstacle or the fluctuation is indicated.
In the second state, the first laser transmitter 21 and the second laser transmitter 22 respectively emit laser light toward both sides. In this embodiment, the first laser transmitter 21 emits laser light toward the right, and the second laser transmitter 22 emits laser light toward the left.
The tunnel safety induction system comprises a tunnel safety induction intelligent helmet and a plurality of indicating devices 3 which are uniformly arranged on the ground, wherein each indicating device 3 comprises a shell 31, a focusing collimating mirror 32 and a first reflecting mirror 33, a through installation cavity is formed in the shell 31, the focusing collimating mirror 32 is installed at one end of the installation cavity, the first reflecting mirror 33 is installed at the other end of the installation cavity, and the mirror surface of the first reflecting mirror 33 is positioned on the focus of the focusing collimating mirror 32.
According to the invention, light is converged on the first reflecting mirror 33 at the focal point according to the characteristic of converging light by the convex lens, and the angles of the laser emitted by the intelligent helmet are different due to different stations of people in the tunnel, so that the laser at different angles can be converged on the first reflecting mirror 33 at the focal point for reflection by the convex lens.
As shown in fig. 4, as an embodiment, the first reflecting mirror 33 is disposed towards the focusing collimator 32 of the next indicating device 3, and the laser light emitted by the first laser emitter 21 or the second laser emitter 22 is converged by the focusing collimator 32 and then reflected by the first reflecting mirror 33 to the focusing collimator 32 of the next indicating device 3 until reaching the exit, so as to form an induction route, and once an accident such as fire or car accident occurs, people in the tunnel can escape according to the route. In order to allow light to pass farther, the focusing lens of the focusing collimator lens 32 has a plano-convex lens and a crescent lens, which is used in the present embodiment because the crescent lens has a better focusing effect.
Because some conventional guidance indication systems in tunnels can not be used due to power failure when fire and the like occur, the invention can be used when the accident damages the mains supply without the mains supply and only by using an intelligent helmet to emit laser (the helmet body 1 can be internally provided with a power supply), and the focusing collimating mirror 32 and the first reflecting mirror 33 are all parts without the power supply.
The indication device adopts relay mode, so the laser light path in the indication device 3 is adjusted in advance to ensure that the light path is always in a communicated state, and the indication device 3 needs to be adjusted when the tunnel is constructed and installed in consideration of the angle of turning of the tunnel. In the traditional light path adjusting method, a paper adhesive tape is stuck before a reflector to be adjusted, a point-shooting key is pressed, laser irradiates on the paper adhesive tape, marks are marked, then the position of a laser tube is adjusted or the angle and the height of the reflector are adjusted, the light beam emitted from the laser tube is ensured to be shot at the center of the reflector, and therefore the light path transmissibility of the indicating device 3 and the rear indicating device 3 is ensured.
As shown in fig. 2-3, the first reflecting mirror 33 includes a first reflecting mirror body 331 and a rotating groove 332 located on the back side of the first reflecting mirror body 331, the housing 31 is provided with a spherical positioning member 34, and the spherical positioning member 34 is embedded in the rotating groove 332 and is in rotating fit with the first reflecting mirror body 331. The orientation of the first reflecting mirror 33 needs to be adjusted during initial debugging, so that the light reflected by the first reflecting mirror 33 can be irradiated onto the focusing collimating mirror 32 of the next indicating device 3, that is, debugging is completed, and no special conditions (such as damage, maintenance and the like) are needed at the later stage, so that the position of the first reflecting mirror 33 does not need to be adjusted.
Preferably, a light sensor is disposed on the mirror surface of the first reflecting mirror 33, and the light sensor is connected to the main controller in a communication manner. The main controller can receive the data transmitted by the light sensor, and judge the distance from the tunnel outlet according to the quantity of light sensed by the light sensor, specifically, when the indicating device 3 is arranged, the distance between the light sensor and the tunnel outlet is the same, so that the distance from the tunnel outlet can be obtained only by multiplying the distance by the quantity of light sensed by the light sensor, the main controller can send the distance information to the controller on the intelligent helmet, and the voice module arranged in the intelligent helmet can play the distance information. If the distance in the direction is far, the main controller can instruct people to escape in the opposite direction.
As shown in fig. 5-6, as another embodiment, the device further comprises a plurality of reflecting devices 4 arranged on the wall in the tunnel, the reflecting devices 4 comprise a frame 41 and a second reflecting mirror 42 arranged on the frame 41, and the second reflecting mirror 42 is arranged towards the focusing collimating mirror 32 of the next indicating device 3;
The first reflecting mirror 33 is arranged towards the second reflecting mirror 42 of the adjacent reflecting device 4, the laser emitted by the first laser emitter 21 or the second laser emitter 22 is converged by the focusing collimating mirror 32, and then is reflected to the focusing collimating mirror 32 of the next indicating device 3 through the first reflecting mirror 33 and the second reflecting mirror 42 until reaching the tunnel exit to form a broken line inducing route, and once an accident such as fire or car accident occurs, people in the tunnel can escape according to the route. In the event of an accident, an obstacle may exist between two adjacent indicating devices 3, and the obstacle cannot be reflected to the focusing collimator lens 32 of the next indicating device 3 through the first reflecting mirror 33, and the first reflecting mirror 33 is arranged towards the second reflecting mirror 42 of the adjacent reflecting device 4 in this embodiment, so that the situation that the laser cannot be reflected due to the obstacle existing between the two adjacent indicating devices 3 is avoided.
As a preferred mode, the two sides of the tunnel are provided with a plurality of indicating devices 3, in the second state, the laser emitted by the first laser emitter 21 and the second laser emitter 22 is converged by the focusing collimating mirror 32 and then reflected by the first reflecting mirror 33 and the second reflecting mirror 42 to the focusing collimating mirror 32 of the next indicating device 3, so as to form an inducing path on the two sides of the tunnel.
As shown in fig. 7, in another embodiment, a housing 31 of the indicating device 3 has a larger hole at one end for mounting a focusing collimator 32, and a small hole at the other end, and the size of the small hole is the same as the first laser transmitter 21 and the second laser transmitter 22 and the external dimensions. When in use, the first laser transmitter 21 or the second laser transmitter 22 can be disassembled and installed in the small hole on the shell 31 of the nearest indicating device 3, and the laser emitted by the first laser transmitter 21 or the second laser transmitter 22 is directly irradiated on the focusing collimating mirror 32 of the adjacent indicating device 3, so that the embodiment can better stabilize the first laser transmitter 21 or the second laser transmitter 22.
In another embodiment, the first reflecting mirror 33 is rotatably fitted in the housing 31, and the mirror surface of the first reflecting mirror 33 is located at the focal point of the focusing collimating mirror 32, and the first reflecting mirror 33 is disposed toward the focusing collimating mirror 32 of the next pointing device 3.
As shown in fig. 8, as a preferred mode, the surface of the focusing collimator lens 32 is provided with a plurality of scale stripes, and the middle part is provided with a center mark, and when in use, the laser is preferably emitted to the center mark.
A tunnel security induction method, using a tunnel security induction system for induction, comprising:
S100, adjusting the laser transmitter 2 to face the focusing collimating mirror 32 of the nearest indicating device 3 and transmitting laser, wherein the first reflecting mirror 33 is positioned at the focus of the focusing collimating mirror 32;
s200, laser is converged by the focusing collimating mirror 32 and then reflected to the focusing collimating mirror 32 of the next indicating device 3 through the first reflecting mirror 33, so as to form an induction route;
S300, the main controller counts the laser reflection times to obtain the approximate distance between the current position and the tunnel outlet and provides an induction scheme.
In S300, the main controller counts the number of times the light sensor detects the laser as the number of times of laser reflection. The first reflecting mirror 33 is provided with a light sensor on the surface thereof, and the light sensor is in communication connection with the main controller. The main controller can receive the data transmitted by the light sensor, and judge the distance from the tunnel outlet according to the quantity of light sensed by the light sensor, specifically, when the indicating device 3 is arranged, the distance between the light sensor and the tunnel outlet is the same, so that the distance from the tunnel outlet can be obtained only by multiplying the distance by the quantity of light sensed by the light sensor, the main controller can send the distance information to the controller on the intelligent helmet, and the voice module arranged in the intelligent helmet can play the distance information. If the distance in the direction is far, the main controller can instruct people to escape in the opposite direction.
In a preferred manner, in S200, the device further includes a plurality of reflecting devices 4 disposed on the wall in the tunnel, where the reflecting devices 4 include a frame 41 and a second reflecting mirror 42 disposed on the frame 41, the second reflecting mirror 42 is disposed towards the focusing collimating mirror 32 of the next indicating device 3, the first reflecting mirror 33 is disposed towards the second reflecting mirror 42 of the adjacent reflecting device 4, the laser emitted by the first laser emitter 21 or the second laser emitter 22 is converged by the focusing collimating mirror 32 and then reflected by the first reflecting mirror 33 and the second reflecting mirror 42 to the focusing collimating mirror 32 of the next indicating device 3, so as to form a broken line inducing route, and the laser emitted by the laser emitter 2 is converged by the focusing collimating mirror 32 and then reflected by the first reflecting mirror 33 and the second reflecting mirror 42 to the focusing collimating mirror 32 of the next indicating device 3, so as to form a broken line inducing route.
The foregoing is merely a preferred embodiment of the present invention, and the scope of the invention is defined by the claims, and those skilled in the art should also consider the scope of the present invention without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a tunnel safety induction system which characterized in that, including tunnel safety induction intelligent helmet, tunnel safety induction intelligent helmet includes:
The helmet body (1) is provided with a mounting groove (11) at the upper end;
Laser emitter (2), set up in mounting groove (11), include:
the first laser emitter (21) is rotatably arranged on the surface of the mounting groove (11);
The second laser emitter (22) is positioned above the first laser emitter (21) and is rotatably arranged on the surface of the mounting groove (11);
The intelligent helmet is provided with a first state and a second state, wherein in the first state, a first laser emitter (21) and a second laser emitter (22) emit laser forward for ranging, and in the second state, the first laser emitter (21) and the second laser emitter (22) emit laser towards two sides respectively;
The display device comprises a ground, and is characterized by further comprising a plurality of indicating devices (3) uniformly arranged on the ground, wherein the indicating devices (3) comprise a shell (31), a convex lens (32) and a first reflecting mirror (33), a through installation cavity is arranged on the shell (31), the convex lens (32) is installed at one end of the installation cavity, the first reflecting mirror (33) is installed at the other end of the installation cavity, and the mirror surface of the first reflecting mirror (33) is positioned on the focus of the convex lens (32);
The first reflecting mirror (33) is arranged towards the convex lens (32) of the next indicating device (3), and the laser emitted by the first laser emitter (21) or the second laser emitter (22) is converged by the convex lens (32) and then reflected to the convex lens (32) of the next indicating device (3) through the first reflecting mirror (33) to form an induction route.
2. The tunnel security induction system according to claim 1, wherein the first reflector (33) comprises a first reflector body (331) and a rotating groove (332) located on the back side of the first reflector body (331), the shell (31) is provided with a spherical positioning piece (34), and the spherical positioning piece (34) is embedded in the rotating groove (332) and is in rotating fit with the first reflector body (331).
3. A tunnel security induction system according to claim 1, characterised in that said first mirror (33) is provided with a light sensor on its mirror surface, said light sensor being communicatively connected to a master controller.
4. A tunnel security induction system according to claim 1, further comprising a plurality of reflecting means (4) arranged on the wall in the tunnel, said reflecting means (4) comprising a frame (41) and a second reflecting mirror (42) arranged on the frame (41), said second reflecting mirror (42) being arranged towards the convex lens (32) of the next indicating means (3);
The first reflecting mirror (33) is arranged towards the second reflecting mirror (42) of the adjacent reflecting device (4), and the laser emitted by the first laser emitter (21) or the second laser emitter (22) is converged by the convex lens (32) and then reflected to the convex lens (32) of the next indicating device (3) through the first reflecting mirror (33) and the second reflecting mirror (42) to form a broken line induction route.
5. The tunnel security guidance system of claim 4, wherein the plurality of indication devices (3) are disposed on two sides of the tunnel, and in the second state, the laser emitted by the first laser emitter (21) and the second laser emitter (22) is converged by the convex lens (32) and then reflected by the first reflecting mirror (33) and the second reflecting mirror (42) to the convex lens (32) of the next indication device (3), so as to form a guidance route on two sides of the tunnel.
6. A tunnel security induction method, characterized in that the induction is performed using the tunnel security induction system according to any one of claims 1 to 5, comprising:
S100, adjusting the laser transmitter (2) to face the convex lens (32) of the nearest indicating device (3) and transmitting laser;
s200, laser is converged by the convex lens (32) and then reflected to the convex lens (32) of the next indicating device (3) through the first reflecting mirror (33) to form an induction route;
s300, the main controller counts the laser reflection times to obtain the distance between the current position and the tunnel outlet and provides an induction scheme.
7. The tunnel security induction method according to claim 6, wherein in S300, the main controller counts the number of times the light sensor detects the laser as the number of laser reflections.
8. The tunnel security induction method according to claim 6, wherein in S200, the laser emitted by the laser emitter (2) is converged by the convex lens (32) and then reflected by the first reflecting mirror (33) and the second reflecting mirror (42) to the convex lens (32) of the next indicating device (3) to form a broken line induction route.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211539429.9A CN116019280B (en) | 2022-12-02 | 2022-12-02 | A tunnel safety induction intelligent helmet, induction system and induction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211539429.9A CN116019280B (en) | 2022-12-02 | 2022-12-02 | A tunnel safety induction intelligent helmet, induction system and induction method |
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| Publication Number | Publication Date |
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| CN116019280A CN116019280A (en) | 2023-04-28 |
| CN116019280B true CN116019280B (en) | 2025-06-13 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096745A (en) * | 2011-08-10 | 2013-05-08 | 珍妮特·琼斯 | Safety helmet or headpiece with improved safety features |
| CN217851541U (en) * | 2022-05-10 | 2022-11-22 | 中国联合网络通信集团有限公司 | Intelligent helmet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7393121B2 (en) * | 2006-01-23 | 2008-07-01 | Trevor Scott Small | Laser guidance emergency navigation method and system |
| JP6923190B2 (en) * | 2017-07-05 | 2021-08-18 | コスモケミカル株式会社 | Auxiliary tools and how to use auxiliary tools |
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2022
- 2022-12-02 CN CN202211539429.9A patent/CN116019280B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096745A (en) * | 2011-08-10 | 2013-05-08 | 珍妮特·琼斯 | Safety helmet or headpiece with improved safety features |
| CN217851541U (en) * | 2022-05-10 | 2022-11-22 | 中国联合网络通信集团有限公司 | Intelligent helmet |
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| CN116019280A (en) | 2023-04-28 |
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