CN211844453U - Portable intelligent rail small flatcar positioning and sound-light alarming device - Google Patents
Portable intelligent rail small flatcar positioning and sound-light alarming device Download PDFInfo
- Publication number
- CN211844453U CN211844453U CN202020422392.1U CN202020422392U CN211844453U CN 211844453 U CN211844453 U CN 211844453U CN 202020422392 U CN202020422392 U CN 202020422392U CN 211844453 U CN211844453 U CN 211844453U
- Authority
- CN
- China
- Prior art keywords
- positioning
- module
- sound
- circuit board
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The utility model discloses a portable intelligent track dolly location and audible-visual alarm device can install on track dolly, and it includes: the positioning module adopts a UWB positioning technology and is used for sending a ranging instruction signal and a response signal of a receiving terminal to the ranging instruction signal, the distance between the positioning module and the receiving terminal is calculated and obtained according to the time length between the sent ranging instruction signal and the received response signal, the control circuit board is used for comparing the distance information transmitted to the positioning module with the preset distance information in the positioning module and obtaining a comparison result, and the control circuit board is used for controlling the alarm module to work according to the comparison result. The utility model discloses a orientation module and alarm module can remind the operation personnel to notice to dodge near the track small flatcar that installs same orientation module, reduce track construction incident, improve construction factor of safety.
Description
Technical Field
The utility model relates to an urban subway track equipment location technical field especially relates to an intelligence track dolly location and audible-visual alarm device.
Background
In the subway construction stage, the mobile operator communication base station does not introduce a tunnel. When the construction operation of the track in the tunnel is caused, a construction party needs to independently establish a tunnel network so as to facilitate the guidance of the track laying dispatching operation and ensure the safety of the construction operation in the track running area. The positioning technology of the rail cars and the small flat cars is particularly critical. The small rail flatcar is the most commonly used manpower transportation tool during construction, but the space in the tunnel is narrow, the visual field range is limited, the driving noise of the rail car is large, a rail car driver cannot completely master the construction condition in front, and if the small rail flatcar cannot be evacuated in time before the rail car arrives, the rail car and the small flatcar are very easy to collide, so that construction safety accidents occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the above-mentioned prior art, provide a portable intelligent track dolly location and audible-visual alarm device. The positioning module and the alarm module can remind an operator to avoid a railcar or a small rail flat car which is provided with the same positioning module nearby, so that the safety accidents of rail construction are reduced, and the construction safety factor is improved.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a portable intelligent track dolly location and audible-visual alarm device, can install on the track dolly, a serial communication port, portable intelligent track dolly location and audible-visual alarm device includes: the positioning module, the control circuit board and the power module are fixedly arranged in the shell, and the power module is respectively electrically connected with the positioning module, the control circuit board and the alarm module and is used for providing electric energy required by working for the positioning module, the control circuit board and the alarm module;
the positioning module adopts UWB positioning technology and is used for sending a distance measuring instruction signal and a response signal of a receiving terminal to the distance measuring instruction signal, and calculating and acquiring the distance between the positioning module and the receiving terminal according to the length of time taken by the positioning module from sending the distance measuring instruction signal to receiving the response signal multiplied by the speed of light, and the positioning module is electrically connected with the control circuit board and is used for transmitting the calculated and acquired distance information to the control circuit board;
the control circuit board is used for comparing the distance information transmitted to the control circuit board by the positioning module with the preset distance information in the control circuit board to obtain a comparison result, and the control circuit board is electrically connected with the alarm module and used for controlling the alarm module to work according to the comparison result.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the positioning module can also be used for receiving the ranging instruction signal and sending a corresponding response signal according to the ranging instruction signal.
The terminal is a fixed terminal which is arranged on the small rail car positioning and sound-light alarming device or a positioning network system and is used for receiving distance measuring instruction signals and sending response signals.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the power module is a lithium ion battery pack.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the alarm module comprises a sound alarm device and a light alarm device, wherein the sound alarm device is electrically connected with the control circuit board and can give out alarm sound or voice prompt under the control of the control circuit board;
the light ray alarm device is electrically connected with the control circuit board and can send out alarm prompts through the strength, brightness, flicker or color change of light rays under the control of the control circuit board.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the sound alarm device is a horn or a buzzer, and is arranged in the shell or on the small rail flat car.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the light ray alarm device is an LED lamp, an LED lamp belt or a rotary alarm lamp, and is arranged in the shell or on the small rail flat car.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the portable intelligent rail small flat car positioning and sound-light alarm device is detachably arranged on the rail small flat car.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the portable intelligent rail small flat car positioning and sound-light alarming device is detachably fixed on the rail small flat car through strong magnet adsorption or bolts.
Foretell little flatcar location of portable intelligence track and audible-visual alarm device, its characterized in that: the portable intelligent rail small flat car positioning and sound-light alarming device is fixed on the rail small flat car through welding or gluing.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a UWB location technique because the UWB signal has high positioning accuracy, and its positioning accuracy can be less than 0.5 meter.
2. The utility model discloses a UWB location technique because the UWB signal has better real-time and has very strong penetrating power, its detection range is wide, and the reaction is sensitive, and the vehicle that is equipped with the device near detection that can be timely accurate in time reminds the staff in time to dodge.
3. The utility model discloses cross orientation module and alarm module and can remind the operation personnel to notice to dodge near railcar or the small rail car that installs same orientation module, reduce track construction incident, improve construction safety factor.
4. The utility model discloses a sound, warning light two kinds of forms in time remind constructor, and the validity that the warning was reminded is high.
5. The utility model discloses a with the demountable installation of automobile body, portable easily carries and installs, can adopt multiple modes such as magnetic adsorption, sticky, threaded connection to fix on the track line district construction equipment simultaneously.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a circuit diagram of the control circuit board of the present invention.
Fig. 3 is a circuit diagram of the positioning module of the present invention.
Description of reference numerals:
1-a positioning module; 2-a control circuit board; 3, a power supply module;
4, an alarm module; 5-shell.
Detailed Description
The utility model provides a portable intelligent track dolly location and audible-visual alarm device will be described in detail through the embodiment below. It should be noted that the description of the embodiments is provided to help understanding of the present invention, and does not limit the present invention.
As shown in fig. 1, the positioning and sound-light alarm device for a portable intelligent small rail car in this embodiment can be installed on a small rail car, and includes: the device comprises a positioning module 1, a control circuit board 2, a power supply module 3, an alarm module 4 and a shell 5, wherein the positioning module 1, the control circuit board 2 and the power supply module 3 are all fixedly installed in the shell 5, and the power supply module 3 is respectively electrically connected with the positioning module 1, the control circuit board 2 and the alarm module 4 and is used for providing electric energy required by working for the positioning module 1, the control circuit board 2 and the alarm module 4;
the positioning module 1 adopts a UWB positioning technology and is used for sending a distance measurement instruction signal and a response signal of a receiving terminal to the distance measurement instruction signal, calculating and acquiring the distance between the positioning module 1 and the receiving terminal according to the length of time taken by the positioning module 1 from sending the distance measurement instruction signal to receiving the response signal multiplied by the speed of light, and the positioning module 1 is electrically connected with the control circuit board 2 and is used for transmitting the calculated and acquired distance information to the control circuit board 2;
the control circuit board 2 is used for comparing the distance information transmitted to the positioning module 1 with the preset distance information in the positioning module and obtaining a comparison result, and the control circuit board 2 is electrically connected with the alarm module 4 and is used for controlling the alarm module 4 to work according to the comparison result.
The utility model discloses a set up orientation module 1, control circuit board 2, power module 3 and alarm module 3 on the little flatcar of track. The positioning module 1 adopts UWB positioning technology. UWB is a new and new wireless communication technology that is emerging in recent years and is very different from conventional communication technologies. The method does not need to use carrier waves in a traditional communication system, and transmits data by sending and receiving extremely narrow pulses with nanosecond or nanosecond level or below, so that the method has the bandwidth of 3.1-10.6 GHz level. The transmission rate is high, the transmitting power is low, the penetration capability is strong, the wireless technology is based on the extremely narrow pulse, and no carrier wave exists. It is these advantages that make it obtain more accurate results in the field of indoor positioning. The ultra-wideband indoor positioning technology usually adopts a TDOA (time difference of arrival) demonstration ranging positioning algorithm, namely an ultra-wideband system for positioning through hyperbolic crossing comprises a radio system for generating, transmitting, receiving and processing extremely-narrow pulse signals. And the ultra-wideband indoor positioning system comprises a UWB receiver, a UWB reference tag and an active UWB tag. In the positioning process, a UWB receiver receives UWB signals transmitted by the tags, signals containing effective information are obtained by filtering various noise interferences mixed in the transmission process of electromagnetic waves, and then distance measurement positioning calculation analysis is carried out through the central processing unit. The position of the rail trolley can be detected by the positioning module 1. The utility model provides a 1 main chip of orientation module adopts dw1000 chips. The PCB circuit diagram is shown in FIG. 3. In fig. 3, U2 is a main chip of the positioning module, and performs data interaction with an external positioning base station through an external antenna E1 to implement a positioning algorithm, and transmits positioning data to the 2.4G radio frequency module in real time. U12(AMS1117-1.8) supplies power to the chip at 1.8V. And the U11. the U13 inverting logic device and the Q1. the Q2 triode realize the level conversion from the 3.3V control signal of the DW1000 to 5V. The core function of the module is to realize a positioning algorithm and obtain real-time positioning data.
The utility model discloses well control circuit board 2 adopts multichannel DI/DO control circuit design for receive the positional information of the track small flatcar that orientation module 1 detected, and according to the positional information of track small flatcar, control alarm module 4 sends the warning, reminds personnel to notice, reduces the emergence of incident. The control circuit board 2 is powered by the power module 3. The PCB diagram of the control circuit board 2 is shown in fig. 2. In fig. 2, U3 is a 2.4G rf module, and is responsible for uploading positioning data to a background server and receiving a control command of the system. The LED5 is a running indicator lamp of U3, and can indicate the working state of U3 in real time. JT1 is a U3 program burning debugging interface, and is used for updating and upgrading programs. J2 and J3 are two-way digital switch output interfaces for controlling external warning lights and alarms or other linkage devices. J4 is two-way reserved digital switch input interface, gathers external digital switch signal and gives main control chip, satisfies system extension demand better. The working principle of the whole control system is simple and clear: the U3 uploads the positioning data of the positioning module to the background server in real time, the background server obtains the specific position of the small flat car through a series of algorithms, when the server finds that the collision hidden danger exists between the small flat car and the positions of other positioning terminals (rail locomotives, workers, cranes and the like), the server sends a control command, and when the U3 receives the control command sent by the system, the U3 broadcasts alarm information immediately and controls an external alarm lamp to flash and an alarm to give an alarm.
And simultaneously the utility model discloses a positioning module 1's wireless location function can join in the positioning network system, finally reflects the device's real-time position on the dispatching system of driving, provides the foundation for reasonable dispatch.
In this embodiment, the positioning module 1 may be further configured to receive the ranging instruction signal and send a corresponding signal according to the ranging instruction signal. The utility model discloses a positioning module 1 mainly relies on TOF time of flight range finding method, belongs to two-way range finding technique, and UWB module range finding is realized through UWB signal make a round trip to propagate used time multiply the mode of light speed between two modules, concrete computational formula: distance TOF × C (speed of light). Therefore, the UWB positioning module can work out of the tunnel positioning network and can detect other vehicles with the device within the range of 1 km. And the alarm module 3 is controlled by the control circuit board 2 according to the preset condition to remind people of paying attention to nearby vehicles, so that the vehicles can be avoided in advance, and the occurrence of safety accidents is reduced.
The utility model discloses a characteristics according to the track engineering construction provide one kind can reduce track construction incident, can improve construction safety factor, and simple structure, simple to operate, the high portable intelligent track dolly location of precision and audible-visual alarm device. The device can carry out the warning of job site railcar and little flatcar distance and remind, is favorable to reducing construction safety risk by a wide margin, has wide popularization and application value in the track traffic construction.
In the implementation, the terminal is a fixed terminal which is arranged on a portable intelligent rail small flat car positioning and sound-light alarming device or a positioning network system on the rail small flat car and is used for receiving a distance measuring instruction signal and sending a response signal.
The utility model discloses in through on a certain track little flatcar portable intelligent track little flatcar location and acousto-optic warning device on orientation module 1 to locate on the track another track little flatcar of operation equally or on the track car on portable intelligent track little flatcar location and acousto-optic warning device on the track car send range finding command signal, send response signal after range finding command signal is received to orientation module on another track little flatcar on portable intelligent track little flatcar location and the acousto-optic warning device, the orientation module who sends range finding command signal receives response signal, the orientation module who sends range finding command signal utilizes UWB signal to make a round trip to propagate used time multiply the light speed between two modules and calculates the distance between two track little flatcars of acquireing.
The utility model discloses in send the range finding command signal to the fixed terminal in the positioning network system through the orientation module 1 on portable intelligent track small flatcar location and the audible-visual alarm device on a certain track small flatcar, fixed terminal sends response signal after receiving range finding command signal, orientation module 1 on portable intelligent track small flatcar location and the audible-visual alarm device on the track small flatcar receives after the response signal, calculate the distance between the fixed terminal in orientation module 1 and the positioning network system through the propagation used time multiply the light speed, through setting up a plurality of fixed terminals, we just can realize the accurate location of orientation module 1 on plane or space on portable intelligent track small flatcar location and the audible-visual alarm device on the track small flatcar. Meanwhile, the positioning information can be accessed into a driving dispatching system and a vehicle management system, so that the vehicle can be conveniently dispatched and managed.
In this embodiment, the power module 3 is a lithium ion battery pack. The lithium ion battery pack has small volume, high capacity, light weight, strong adaptability and can work at the ambient temperature of-20 ℃ to +55 ℃.
In this embodiment, the alarm module 4 includes an audio alarm device and a light alarm device, wherein the audio alarm device is electrically connected to the control circuit board 2 and can send out an alarm sound or a voice prompt under the control of the control circuit board 2;
the light ray alarm device is electrically connected with the control circuit board 2 and can send out alarm prompts through the strength, brightness, flicker or color of light rays under the control of the control circuit board 2.
In this embodiment, the sound alarm device is a horn or a buzzer, and the sound alarm device is arranged in the housing 5 or on the small rail car.
In this embodiment, the light alarm device is an LED lamp, an LED lamp strip, or a rotary warning light, and the light alarm device is disposed in the housing 5 or on the small rail car.
Set up audible alarm device and light alarm device in the place that the track small flatcar automobile body easily arouses noticing, even too can be quick arouse operating personnel's attention under noisy or the dim environment of light in the tunnel attention, avoid the emergence of accident.
In the implementation, the portable intelligent rail small flat car positioning and sound-light alarming device is detachably arranged on the rail small flat car.
In this embodiment, the portable intelligent rail small flat car positioning and sound-light alarming device is detachably fixed on the rail small flat car through strong magnet adsorption or bolts.
In this embodiment, the portable intelligent rail trolley positioning and sound-light alarming device is fixedly fixed on the rail trolley by welding or gluing.
The utility model discloses a theory of operation does: the utility model discloses a orientation module 1 adopts UWB location technique. The method is mainly based on a TOF flight time ranging method, belongs to a two-way ranging technology, and is realized in a mode that the time for a UWB signal to propagate back and forth between two positioning modules is multiplied by the speed of light by a positioning module 1, wherein the specific calculation formula is as follows: distance TOF × C (speed of light). Therefore, the UWB positioning module can work out of the tunnel positioning network and can detect other vehicles with the device within the range of 1 km. And the alarm module 3 is controlled by the control circuit board 2 according to the preset condition to remind people of paying attention to nearby vehicles, so that the vehicles can be avoided in advance, and the occurrence of safety accidents is reduced. Meanwhile, the UWB has better real-time performance, very strong penetrating power and high-precision positioning performance. Therefore, the positioning requirement in the tunnel can be well met.
The utility model discloses in, can also set up the positioning terminal of a plurality of regulations in the tunnel, send range finding command signal to positioning terminal through orientation module 1, positioning terminal sends response signal, orientation module 1 receives response signal, calculates the distance of acquireing orientation module 1 apart from positioning terminal, through the distance of acquireing orientation module 1 to the positioning terminal of a plurality of known positions, connect the accessible to calculate and acquire the concrete position of orientation module 1 on the track, realize pinpointing. Meanwhile, the positioning information can also be transmitted to a positioning network system or a vehicle dispatching system to form information exchange with the positioning network system or the vehicle dispatching system, so that the functions of real-time monitoring, intelligent dispatching, alarm information transmission and the like of the positioning network system or the vehicle dispatching system are realized.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent structure transform that the above embodiment was done the utility model discloses technical scheme's within the scope of protection.
Claims (10)
1. The utility model provides a portable intelligent track dolly location and audible-visual alarm device, can install on the track dolly, a serial communication port, portable intelligent track dolly location and audible-visual alarm device includes: the intelligent alarm device comprises a positioning module (1), a control circuit board (2), a power module (3), an alarm module (4) and a shell (5), wherein the positioning module (1), the control circuit board (2) and the power module (3) are all fixedly installed in the shell (5), and the power module (3) is respectively electrically connected with the positioning module (1), the control circuit board (2) and the alarm module (4) and is used for providing electric energy required by working for the positioning module (1), the control circuit board (2) and the alarm module (4);
the positioning module (1) adopts a UWB positioning technology and is used for sending a distance measurement instruction signal and receiving a response signal of the terminal to the distance measurement instruction signal, the distance between the positioning module (1) and the receiving terminal is calculated and obtained according to the length of time used by the positioning module (1) from sending the distance measurement instruction signal to receiving the response signal multiplied by the speed of light, and the positioning module (1) is electrically connected with the control circuit board (2) and is used for transmitting the calculated and obtained distance information to the control circuit board (2);
the control circuit board (2) is used for comparing the distance information transmitted to the control circuit board by the positioning module (1) with the preset distance information in the control circuit board to obtain a comparison result, and the control circuit board (2) is electrically connected with the alarm module (4) and is used for controlling the alarm module (4) to work according to the comparison result.
2. The portable intelligent rail small flatcar positioning and sound-light alarming device as recited in claim 1, characterized in that: the positioning module (1) can also be used for receiving the ranging instruction signal and sending a corresponding response signal according to the ranging instruction signal.
3. The portable intelligent rail small flatcar positioning and sound-light alarming device as recited in claim 2, characterized in that: the terminal is a fixed terminal which is arranged on a portable intelligent rail small flatcar positioning and sound-light alarming device or a positioning network system and is used for receiving distance measuring instruction signals and sending response signals.
4. A portable intelligent rail small flatcar positioning and sound and light alarm device as claimed in any one of claims 1 to 3, wherein: the power module (3) is a lithium ion battery pack.
5. The portable intelligent rail small flatcar positioning and sound-light alarming device as recited in claim 4, characterized in that: the alarm module (4) comprises a sound alarm device and a light alarm device, and the sound alarm device is electrically connected with the control circuit board (2) and can give out alarm sound or voice prompt under the control of the control circuit board (2);
the light ray alarm device is electrically connected with the control circuit board (2) and can send out alarm prompts through the intensity, the brightness, the flicker or the color change of light rays under the control of the control circuit board (2).
6. The portable intelligent rail small flatcar positioning and sound-light alarming device as recited in claim 5, characterized in that: the sound alarm device is a horn or a buzzer, and is arranged in the shell (5) or on the small rail flat car.
7. The portable intelligent rail small flatcar positioning and sound-light alarming device as claimed in claim 5 or 6, wherein: the light ray alarm device is an LED lamp, an LED lamp belt or a rotary alarm lamp, and is arranged in the shell (5) or on the small rail flat car.
8. The portable intelligent rail small flatcar positioning and sound-light alarming device as recited in claim 1, characterized in that: the portable intelligent rail small flat car positioning and sound-light alarm device is detachably arranged on the rail small flat car.
9. The portable intelligent rail small flatcar positioning and audible and visual alarm device as claimed in claim 8, wherein: the portable intelligent rail small flat car positioning and sound-light alarming device is detachably fixed on the rail small flat car through strong magnet adsorption or bolts.
10. The portable intelligent rail small flatcar positioning and sound-light alarming device as recited in claim 1, characterized in that: the portable intelligent rail small flat car positioning and sound-light alarming device is fixed on the rail small flat car through welding or gluing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020422392.1U CN211844453U (en) | 2020-03-29 | 2020-03-29 | Portable intelligent rail small flatcar positioning and sound-light alarming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020422392.1U CN211844453U (en) | 2020-03-29 | 2020-03-29 | Portable intelligent rail small flatcar positioning and sound-light alarming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211844453U true CN211844453U (en) | 2020-11-03 |
Family
ID=73137142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020422392.1U Active CN211844453U (en) | 2020-03-29 | 2020-03-29 | Portable intelligent rail small flatcar positioning and sound-light alarming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211844453U (en) |
-
2020
- 2020-03-29 CN CN202020422392.1U patent/CN211844453U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108877296B (en) | Anti-collision system based on Internet of things | |
| CN106004931B (en) | A kind of Train Approaching warning system and method based on wireless distance finding technology | |
| AU2009356536B2 (en) | Collision warning apparatus and method for operating the same | |
| CN101694748A (en) | Real-time system for monitoring and pre-warning mist on highway | |
| CN104953709A (en) | Intelligent patrol robot of transformer substation | |
| CN102591304A (en) | Operation monitoring system for underground electric locomotive of mine | |
| CN212872892U (en) | Vehicle-mounted cascade millimeter wave radar, detection system and rail vehicle | |
| CN110775098A (en) | Active train control system | |
| CN103871223A (en) | Information collecting and warning device for dangerous chemical transportation | |
| CN203243373U (en) | Integrated network monitoring system for logistics vehicle | |
| CN211844453U (en) | Portable intelligent rail small flatcar positioning and sound-light alarming device | |
| CN113567911A (en) | Detection positioning method and system for unmanned aerial vehicle control device | |
| CN110363995A (en) | There are comprehensive detection system and its detection methods for a kind of vehicle | |
| CN211263763U (en) | Mobile mechanical anti-collision positioning device based on UWB ranging and GPS positioning | |
| CN113115212A (en) | Management system based on UWB mine staff | |
| CN201796501U (en) | Red light warning system | |
| CN204236423U (en) | Multi-mode seeks truck system and device | |
| CN110667652A (en) | Subway operation intelligent scheduling system based on accurate position of train | |
| CN216437491U (en) | Mining positioning system based on ultra wide band technology | |
| CN214752271U (en) | Speed measuring device based on millimeter wave radar | |
| Tippannavar et al. | EVAS-Emergency Vehicle Alert System using LoRa for automobiles | |
| CN208597182U (en) | A kind of list base station location system | |
| CN206975840U (en) | A kind of vehicle-mounted hill path precaution device | |
| CN221096724U (en) | Turning monitoring auxiliary system for limited space fan transportation | |
| CN217008426U (en) | Anti-collision early warning system of rail transportation equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |