CN217467790U - Train firework alarm system - Google Patents
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- CN217467790U CN217467790U CN202221695015.0U CN202221695015U CN217467790U CN 217467790 U CN217467790 U CN 217467790U CN 202221695015 U CN202221695015 U CN 202221695015U CN 217467790 U CN217467790 U CN 217467790U
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Abstract
The utility model provides a train firework alarm system, it includes: the smoke and fire alarm controller is electrically connected with the train network system; the fire detector is used for detecting fire information and fault diagnosis and processing and generating fire alarm signals and fault signals, and comprises: the wireless smoke detector is connected with the smoke alarm controller through a LoRa wireless network; the wired smoke and fire detector is electrically connected with the smoke and fire alarm controller through a CAN bus; the temperature sensing cable is electrically connected with the firework alarm controller through a cable, and the firework alarm controller receives and judges data detected by the temperature sensing cable to generate a firework alarm signal; the smoke and fire alarm controller processes and summarizes to generate alarm information and fault information according to smoke and fire, fire alarm signals and fault signals and uploads the alarm information and the fault information to the train network system. The utility model discloses simple structure, the overall arrangement is compact, has lightweight, the miniaturized advantage of structure, has satisfied the demand that next generation high-speed railway EMUs subtract heavy speeding.
Description
Technical Field
The utility model belongs to the technical field of rail vehicle fire alarm, especially, relate to a train firework alarm system.
Background
The high-speed motor train unit is a very complicated manned tool in a high-speed motion state, loads electrical equipment with different functions, lays a large number of wires and cables, has the characteristics of complicated carrying of the electrical equipment, small transportation environment space, dense personnel and difficulty in evacuation and rescue, and can bring about great casualties and economic loss if corresponding measures are not found and taken in time in case of fire. Along with the further development of the motor train unit technology in China, the design of the next generation of high-speed rail motor train unit is in progress.
The next-generation high-speed rail smoke and fire alarm system is applied to the next-generation high-speed rail motor train unit train and is used for monitoring the fire alarm state of the train in real time. In the prior art, the firework alarm system is complex in structure, low in integration level, heavy and large in size and cannot meet the requirements of weight reduction and speed acceleration of the next generation of high-speed rail motor train unit. The conventional smoke and fire alarm system mostly adopts a wireless smoke detector and a wired smoke detector to detect fire, mostly does not have the function of resetting and alarming, also has the problems of complicated wiring, limited wireless power supply energy, limited communication capability, insufficient sensitivity and the like, and cannot meet the development requirements of high-speed rail motor train units.
SUMMERY OF THE UTILITY MODEL
The utility model provides an above-mentioned technical problem, a train firework alarm system is proposed, this train firework alarm system has integrated level height, the miniaturized and lightweight advantage of structure, adopts simultaneously to combine together with wired firework detector, temperature sensing cable based on loRa wireless network wireless firework detector, and the sensitivity that has improved the system and the wiring is simple, has reduceed the system consumption, has prolonged communication distance.
In order to achieve the above object, the utility model discloses a technical scheme be:
there is provided a train smoke and fire alarm system comprising:
the smoke and fire alarm controller is electrically connected with the train network system;
the fire detector is used for detecting fire information and fault diagnosis and processing and generating fire alarm signals and fault signals, and comprises:
the wireless smoke detector is connected with the smoke alarm controller through a LoRa wireless network;
the wired smoke and fire detector is electrically connected with the smoke and fire alarm controller through a CAN bus;
the temperature sensing cable is electrically connected with the firework alarm controller through a cable, and the firework alarm controller receives and judges data detected by the temperature sensing cable to generate a firework alarm signal;
the smoke and fire alarm controller processes and summarizes to generate alarm information and fault information according to smoke and fire, fire alarm signals and fault signals and uploads the alarm information and the fault information to the train network system.
The train smoke and fire alarm system provided by the technical scheme has the functions of fire alarm and fault diagnosis, and can display alarm information and fault information on a driver screen and a mechanic screen through a train network system. Through adopting wireless smoke and fire detector based on loRa wireless network to combine together with wired smoke and fire detector, temperature sensing cable, the operation is stable and the reliability is high, has improved system sensitivity and application scope.
In some other embodiments of the present application, the wireless smoke detector comprises:
the detection module detects the smoke concentration or the environmental temperature of the position in real time;
the microcontroller is internally provided with a temperature threshold value and a smoke threshold value for fire occurrence, is connected with the detection module, and generates the fire alarm signal when the smoke concentration or the environment temperature acquired by the microcontroller exceeds the corresponding threshold value;
the LoRa module, with microcontroller connects, fire alarm signal and fault signal pass through the LoRa module transmits to firework alarm control ware.
This technical scheme realizes the communication of firework alarm control ware and wireless firework detector through the long-range loRa wireless communication mode of low-power consumption, has solved the complicated, long distance cable signal distortion problem of wiring.
In some other embodiments of the present application, the pyrotechnic alarm controller comprises:
the CAN board card is connected with the wired smoke and fire detector;
the GW board card is connected with the wireless smoke and fire detector;
the ADDIO board card is connected with the temperature sensing cable;
the TRDP board card is integrated with a control module, and the control module acquires data detected by the temperature sensing cable and data collected and transmitted in the fire detector, processes and summarizes the data, and outputs alarm information and fault information to a train network system;
and the PW board card supplies power to the CAN board card, the GW board card, the TRDP board card, the ADDIO board card and the cable fire detector.
In the technical scheme, the smoke and fire alarm controller is in a modular design and is composed of modular board cards split according to functions, so that the system is convenient to install and maintain; and add the GW integrated circuit board and increased the wireless gateway function of loRa promptly, can carry out loRa radio communication with wireless smoke and fire detector.
In other embodiments of the present application, the TRDP board card further integrates a storage module, and the storage module is connected to the control module and is used for storing data information input and output by the control module.
According to the technical scheme, the train smoke and fire alarm system has an independent information storage function, and subsequent data information calling or accident investigation and tracking are facilitated.
In other embodiments of this application, smoke and fire alarm controller adopts 1U quick-witted case, PW integrated circuit board, CAN integrated circuit board, GW integrated circuit board, TRDP integrated circuit board, ADDIO integrated circuit board set up in 1U quick-witted incasement, and it is independent standard 3U integrated circuit board.
Each integrated circuit board is independently installed in 1U machine case among this technical scheme, and compact overall arrangement and each integrated circuit board can dispose in a flexible way, realize module level and overhaul and maintain, make things convenient for follow-up dimension to protect, and adopt 1U machine case, when guaranteeing that original function remains, machine case volume and quality reduce more than 60%, make firework alarm controller have lightweight, the miniaturized advantage of structure.
In other embodiments of this application, the PW integrated circuit board pass through the width dimension to be 8HP the panel install in 1U machine incasement, CAN integrated circuit board, GW integrated circuit board, TRDP integrated circuit board and ADDIO integrated circuit board all pass through the width dimension to be 4HP the panel install in 1U machine incasement.
In other embodiments of the present application, the wireless smoke detector and the wired smoke detector are both provided with a reset key, and the reset key is used for resetting a fire alarm signal.
The reset key in the technical scheme has the main functions that after a fire disaster happens and a rescue measure is taken, the crew members relieve the alarm, and after the reset, the alarm is reactivated after a new fire condition is detected.
In other embodiments of this application, wireless smoke and fire detector adopts the power supply of high density lithium cell, the 3V direct current voltage of high density lithium cell output, just be provided with switch on the wireless smoke and fire detector, switch electric connection is in the power supply circuit between high density lithium cell and the wireless fire detector.
This technical scheme selects for use the lithium cell of high energy density to improve the electric quantity, is equipped with switch and makes things convenient for the outage to store.
In other embodiments of the present application, the PW board takes a DC110V power supply from the train as an input, outputs DC5V and DC24V DC voltages, the DC5V is connected to the wireless smoke and fire detector through a backplane bus, and the DC24V is connected to the CAN board, the GW board, the TRDP board, and the ADDIO board through the backplane bus.
In other embodiments of this application, wireless smoke and fire detector with wired smoke and fire detector is two light source smoke and fire detectors, and the smog of two light source smoke and fire detectors detects the principle that adopts red blue two light sources, can calculate through red blue light and judge the smog particle diameter, distinguishes smog and interferent, solves the false alarm problem that interference such as dust, water smoke arouse.
In some other embodiments of the present application, the temperature sensing cable is a digital display type temperature sensing cable, and the digital display type temperature sensing cable is used for detecting a fire and a location of the fire.
Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a train smoke and fire alarm system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a train smoke and fire alarm system according to an embodiment of the present invention;
FIG. 3 is a three-view illustration of a line smoke detector in accordance with an embodiment of the present invention;
FIG. 4 is a three-view illustration of a wire smoke detector in accordance with an embodiment of the present invention;
in the above figures: a train pyrotechnic alarm system 100; a smoke and fire alarm controller 1; a CAN board card 11; a GW card 12; an ADDIO board card 13; a TRDP board 14; a PW board card 15; a wireless smoke detector 2; a wired smoke detector 3; a temperature-sensitive cable 4; a temperature-sensitive cable body 41; a termination resistor 42; a detection module 43; a CAN bus 5; a cable 6; a power switch 7.
Detailed Description
The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures, and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the terms "inner", "outer", "upper", "lower", "front", "rear", and the like indicate the positional relationship based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
For better understanding of the above technical solutions, the following detailed descriptions are provided with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, in an exemplary embodiment of a train smoke and fire alarm system 100 of the present invention, the train smoke and fire alarm system 100 includes a smoke and fire alarm controller 1, a fire detector and a temperature sensing cable 4, wherein the fire detector is connected to the smoke and fire alarm controller 1 for detecting fire information and fault diagnosis, and processing and generating a fire alarm signal and a fault signal; the temperature sensing cable 4 is electrically connected with the smoke and fire alarm controller 1, the smoke and fire alarm controller 1 receives and judges according to data detected by the temperature sensing cable to generate smoke and fire alarm signals, and the smoke and fire alarm controller 1 receives and processes and gathers according to the smoke and fire alarm signals, fire alarm signals and fault signals to generate alarm information and fault information and uploads the alarm information and the fault information to the train network system.
Specifically, referring to fig. 1, the fire detector comprises a wireless smoke detector 2 and a wired smoke detector 3, wherein the wireless smoke detector 2 is connected with a smoke alarm controller 1 through a LoRa wireless network; the wired smoke and fire detector 3 is electrically connected with the smoke and fire alarm controller 1 through a CAN bus 5; the temperature sensing cable 4 is electrically connected with the firework alarm controller 1 through a cable 6, and the firework alarm controller 1 receives and judges data detected by the temperature sensing cable to generate a firework alarm signal; the smoke and fire alarm controller 1 processes and summarizes to generate alarm information and fault information according to smoke and fire, fire alarm signals and fault signals and uploads the alarm information and the fault information to the train network system. Preferably, the wireless smoke detector 2 and the wired smoke detector 3 are both provided with reset keys, and the reset keys are used for resetting fire alarm signals. The reset key is operated by crew members, can play a role in relieving the alarm after a fire disaster occurs and a rescue measure is taken, and the alarm is reactivated after the new fire condition is detected after the reset key is reset.
The train smoke and fire alarm system 100 provided by the embodiment has smoke and fire, fire alarm and fault diagnosis functions, and can give the train quick and accurate fire hazard early warning by displaying alarm information and fault information on a driver screen and a mechanic screen through a train network system. Through adopting wireless smoke and fire detector 2 based on loRa wireless network to combine together with wired smoke and fire detector 3, temperature sensing cable 4, the operation is stable and the reliability is high, has improved system sensitivity and application scope, falls to minimum with the probability of wrong report police. In this embodiment, the alarm information includes information such as an alarm position, an alarm time, and an initial alarm position, and the fault information includes information such as a fault type, a fault position, and a fault time.
More specifically, in the embodiment, a train smoke and fire alarm system 100 is installed in each compartment of the motor train unit, wherein a plurality of wireless smoke and fire detectors 2 are provided, and a plurality of temperature sensing cables 4 are also provided. The wireless smoke and fire detectors 2 are distributed in the positions of an electric appliance cabinet, a PIS cabinet, an air conditioner cabinet, an ATP cabinet, a living room, a bathroom, a driver cab, a kitchen and the like, the wired smoke and fire detectors 3 are distributed in a storage battery box, the temperature sensing cables 4 are distributed in the positions of a traction converter, an auxiliary converter and the like, the smoke and fire alarm controller 1 uploads alarm information to a train network system, and early fires in various areas in a train can be accurately detected. Preferably, the smoke and fire alarm controller 1 further has a fire detector shielding function, which can shield any fire detector to avoid the influence of the faulty fire detector on the train during the operation of the train. The wireless smoke detector 2 and the wired smoke detector 3 are better suitable for the next generation of high-speed railway motor train units, and the external dimensions are preferably as shown in figures 3 and 4.
Further, the wireless smoke detector 2 in this embodiment includes a detection module, a microcontroller, and a LoRa module. The detection module detects the smoke concentration or the environmental temperature of the position in real time; the microcontroller is internally provided with a temperature and a smoke threshold value for fire occurrence, is connected with the detection module, and generates a fire alarm signal when the smoke concentration or the environmental temperature acquired by the microcontroller exceeds the corresponding threshold value; the loRa module is connected with microcontroller, and fire alarm signal and fault signal pass through the transmission of loRa module to firework alarm control ware 1. In the embodiment, the communication between the smoke and fire alarm controller 1 and the wireless smoke and fire detector 2 is realized in a low-power-consumption long-distance LoRa wireless communication mode, the wireless signal transmission distance is increased, and the problems of complicated wiring and long-distance cable signal distortion are solved; the LoRa module comprises a wireless transceiver chip and an antenna, and the microcontroller controls the power supply of the wireless transceiver chip through an output interface. The wireless transceiver chip adopts the mode of intermittent type nature work in order to reduce 2 consumptions of wireless smoke and fire detector, saves battery power. Preferably, the microcontroller adopts a low-power STM32 singlechip, and the model of the wireless transceiver chip is ASR 6501.
In the above embodiment, preferably, the wireless smoke and fire detector 2 is powered by a high-density lithium battery, the high-density lithium battery outputs 3V dc voltage, and the wireless smoke and fire detector 2 is provided with a power switch 7, and the power switch 7 is electrically connected to a power supply circuit between the high-density lithium battery and the wireless fire detector. In this embodiment, wireless smoke and fire detector 2 chooses for use the lithium cell of high energy density to improve the electric quantity to be equipped with switch 7 and make things convenient for the outage to store.
Under the condition that the train is electrified, the wireless smoke detector 2 uploads the smoke concentration or the environmental temperature and the state information collected in one communication period, the alarm signal and the fault signal are uploaded in real time, and the rest time is in a dormant state. In case of a vehicle power outage, the wireless smoke detector 2 is in a sleep state. In this embodiment, the communication period is 20 s.
Further, referring to fig. 2, the smoke and fire alarm controller 1 includes a CAN board card 11, a GW board card 12, an ADDIO board card 13, a TRDP board card 14, and a PW board card 15 connected by a backplane bus.
Specifically, the CAN board card 11 is connected with the wired smoke detector 3 to obtain smoke concentration or ambient temperature collected by the wired smoke detector 3 and generated fire alarm signals and fault signals; the GW board card 12 is connected with the wireless smoke and fire detector 2, and is used for acquiring smoke concentration or environment temperature acquired by the wireless smoke and fire detector 2 and generating an alarm signal and a fault signal; the ADDIO board card 13 is connected with the temperature sensing cable 4, and reads the resistance value and the temperature value of the temperature sensing cable 4; the TRDP board 14 is integrated with a control module and a storage module, the control module acquires the resistance value and the temperature value of the temperature sensing cable 4 and data collected and transmitted in the fire detector, processes and summarizes the data, and outputs alarm information and fault information to a train network system; the PW board card 15 supplies power to the CAN board card 11, the GW board card 12, the TRDP board card 14, the ADDIO board card 13 and the wired fire detector; the storage module is connected with the control module and used for storing data information input and output by the control module in real time, so that the train smoke and fire alarm system 100 has an independent information storage function and is convenient for subsequent data information calling or accident investigation and tracking. Preferably, the storage module further stores parameters such as a car number and a probe position.
In the embodiment, the smoke and fire alarm controller 1 is in a modular design and is composed of modular board cards split according to functions, so that the system is convenient to install and maintain; the TRDP board 14 realizes a TRDP communication function and is used as an external interface to carry out networking and data interaction with a train; the additionally arranged GW board card 12 increases the LoRa wireless gateway function, and can perform LoRa wireless communication with the wireless smoke detector 2; the fire alarm controller 1 judges that a fire occurs when the resistance value of the temperature sensing cable 4 reaches a preset alarm threshold value, generates a fire alarm signal at the moment, and sends the fire alarm signal to a train network system for fire early warning after analysis and processing. Preferably, the ADDIO card 13 also reads the car number and the reset flag.
Specifically, the smoke and fire alarm controller 1 adopts a 1U case, and a PW board card 15, a CAN board card 11, a GW board card 12, a TRDP board card 14, and an ADDIO board card 13 are arranged in the 1U case, and are all independent standard 3U board cards. Preferably, the PW card 15 is installed in the 1U chassis through a panel with a width dimension of 8HP, and the CAN card 11, the GW card 12, the TRDP card 14, and the apio card 13 are all installed in the 1U chassis through a panel with a width dimension of 4 HP.
Each integrated circuit board of this embodiment is independently installed in 1U machine case, and the overall arrangement is compact and each integrated circuit board can dispose in a flexible way, realizes module level and overhauls and maintain, and convenient follow-up dimension is protected, and adopts 1U machine case, when guaranteeing that original function remains, machine case volume and quality reduce more than 60% for firework alarm controller 1 has the advantage of lightweight, the miniaturized structure.
In this embodiment, the PW board 15 is a power board, and takes a DC110V power supply from the train as an input to output DC5V and DC24V direct-current voltages, the DC5V is connected to the wireless smoke and fire detector 2 through a backplane bus to supply power to the wireless smoke and fire detector, and the DC24V is connected to the CAN board 11, the GW board 12, the TRDP board 14, and the ADDIO board 13 through the backplane bus to supply power to the boards.
Preferably, in the above embodiment, the wireless smoke detector 2 and the wired smoke detector 3 are both dual-light-source smoke detectors, the smoke detection of the dual-light-source smoke detectors adopts a red-blue dual-light-source detection principle, the smoke particle size can be determined through red-blue light calculation, smoke and interferents are distinguished, and meanwhile, a multiband multi-parameter false alarm prevention algorithm is adopted, so that the false alarm problem caused by interference of dust, water mist and the like is solved.
The temperature sensing cable 4 is preferably a digital display type temperature sensing cable, and can detect the fire of the converter and the accurate position of the fire synchronously, so as to provide more detailed guidance information for confirming the cause of the fire.
Specifically, referring to fig. 1, the digital display type temperature sensing cable includes a temperature sensing cable body 41, a terminating resistor 42 and a detection module 43, the terminating resistor 42 and the detection module 43 are respectively connected to the temperature sensing cable body 41 to form a closed-circuit signal acquisition circuit, and the temperature around the temperature sensing cable body 41 and the resistance of the terminating resistor 42 are transmitted to the smoke and fire alarm controller 1 through the detection module 43. When the environmental temperature of the position of the digital display type temperature sensing cable changes, the resistance value in the closed-circuit signal acquisition circuit changes. The firework alarm controller 1 is internally provided with an alarm threshold, obtains the resistance value and the temperature value of the digital display type temperature sensing cable through the ADDIO board card 13, namely the input/output board, and sends out a firework alarm signal when the resistance variation reaches the set alarm threshold. Meanwhile, the fire and smoke alarm controller 1 determines the accurate position of the fire according to the resistance value during the alarm and the line resistance of the temperature sensing cable body 41. Preferably, the detection module 43 is provided with a display screen for displaying the temperature in real time and a status light for displaying the current status of the digital display type temperature sensing cable.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A train pyrotechnic alarm system, comprising:
the smoke and fire alarm controller is electrically connected with the train network system;
the fire detector is used for detecting fire information and fault diagnosis and processing and generating fire alarm signals and fault signals, and comprises:
the wireless smoke detector is connected with the smoke alarm controller through a LoRa wireless network;
the wired smoke and fire detector is electrically connected with the smoke and fire alarm controller through a CAN bus;
the temperature sensing cable is electrically connected with the firework alarm controller through a cable, and the firework alarm controller receives and judges data detected by the temperature sensing cable to generate a firework alarm signal;
the smoke and fire alarm controller processes and summarizes to generate alarm information and fault information according to smoke and fire, fire alarm signals and fault signals and uploads the alarm information and the fault information to the train network system.
2. The train pyrotechnic alarm system of claim 1 wherein the wireless pyrotechnic detector comprises:
the detection module detects the smoke concentration or the environmental temperature of the position in real time;
the microcontroller is internally provided with a temperature and a smoke threshold value for fire occurrence, is connected with the detection module, and generates the fire alarm signal when the smoke concentration or the environmental temperature acquired by the microcontroller exceeds the corresponding threshold value;
the LoRa module, with microcontroller connects, fire alarm signal and fault signal pass through the LoRa module transmits to firework alarm control ware.
3. The train pyrotechnic alarm system of claim 1 wherein the pyrotechnic alarm controller comprises, connected by a backplane bus:
the CAN board card is connected with the wired smoke and fire detector;
the GW board card is connected with the wireless smoke and fire detector;
the ADDIO board card is connected with the temperature sensing cable;
the TRDP board is integrated with a control module, and the control module acquires data detected by the temperature sensing cable and data acquired and transmitted in the fire detector, processes and summarizes the data, and outputs alarm information and fault information to a train network system;
and the PW board card supplies power to the CAN board card, the GW board card, the TRDP board card, the ADDIO board card and the cable fire detector.
4. The train smoke and fire alarm system of claim 3, wherein the TRDP board is further integrated with a storage module, and the storage module is connected with the control module and used for storing data information input and output by the control module.
5. The train smoke and fire alarm system of claim 3, wherein the smoke and fire alarm controller is a 1U case, and the PW board card, the CAN board card, the GW board card, the TRDP board card and the ADDIO board card are arranged in the 1U case and are independent standard 3U board cards.
6. The train smoke and fire alarm system of claim 5, wherein the PW board card is mounted within the 1U chassis via a faceplate having a width dimension of 8HP, and the CAN board card, the GW board card, the TRDP board card, and the ADDIO board card are mounted within the 1U chassis via a faceplate having a width dimension of 4 HP.
7. The train smoke and fire alarm system of claim 1, wherein the wireless smoke and fire detector and the wired smoke and fire detector are both provided with a reset button, and the reset button is used for resetting a fire alarm signal.
8. The train smoke and fire alarm system of claim 1, wherein the wireless smoke and fire detector is powered by a high-density lithium battery, the high-density lithium battery outputs 3V direct current voltage, and a power switch is arranged on the wireless smoke and fire detector and electrically connected in a power supply circuit between the high-density lithium battery and the wireless fire detector.
9. The train smoke and fire alarm system of claim 3, wherein said PW board takes DC110V power from the train as input and outputs DC5V, DC24V DC voltage, said DC5V is connected to said wireless smoke and fire detector through a backplane bus, and said DC24V is connected to said CAN, GW, TRDP, and ADDIO boards through a backplane bus.
10. The train smoke and fire alarm system of claim 1, wherein said wireless smoke and fire detector and said wired smoke and fire detector are both dual light source smoke and fire detectors; and/or, the temperature sensing cable is digital display type temperature sensing cable, digital display type temperature sensing cable is used for detecting the condition of a fire and the condition of a fire position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221695015.0U CN217467790U (en) | 2022-07-01 | 2022-07-01 | Train firework alarm system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221695015.0U CN217467790U (en) | 2022-07-01 | 2022-07-01 | Train firework alarm system |
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| CN217467790U true CN217467790U (en) | 2022-09-20 |
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| CN202221695015.0U Active CN217467790U (en) | 2022-07-01 | 2022-07-01 | Train firework alarm system |
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