333 results about "Fire accident" patented technology

The invention discloses a community fire-fighting toughness evaluation method and system based on an association rule and a complex network, and the method comprises the steps: analyzing the disaster cause of an accident case based on a community fire accident case, and determining a community fire-fighting toughness evaluation index system from four dimensions: defending, rescuing, recovering and adapting; an Apriori algorithm is adopted to mine a coupling relationship between indexes, an association rule is generated, and a community fire-fighting toughness index complex network is constructed; key factors influencing the community fire-fighting toughness are determined by calculating the degree of a community fire-fighting toughness node, the intermediary centrality, the clustering coefficient and the like; and finally, making a fire-fighting toughness improvement scheme according to the key factors. According to the method, the invisible relation between the toughness indexes can be mined, the key factors influencing the community fire-fighting toughness can be determined, the community fire-fighting toughness improvement scheme can be formulated, the problem that community fire-fighting toughness evaluation mainly depends on subjective experience at present is effectively solved, and improvement of the overall fire-fighting toughness of the community is facilitated.

The invention relates to the technical field of bridge safety, and discloses a cable system bridge fire risk assessment method, system, equipment and medium, which considers the influence of weather factors and road linetype factors on the increase probability of fire accidents, is based on collision accident fire and vehicle spontaneous combustion fire, and fuses the risk probability and risk consequence analysis to obtain a risk risk assessment result. Obtaining the probability that each part of the cable system bridge to be evaluated is influenced by various vehicle fire disasters, and obtaining the fire risk consequence of the parts of the cable system bridge to be evaluated under the vulnerability of the bridge structure caused by different types of vehicle fire disasters when the parts of the cable system bridge to be evaluated have / do not have fire prevention measures in combination with the structural damage and the social economic influence; therefore, the fire risk level of each component of the cable system bridge to be evaluated is obtained, and the highest risk of the most unfavorable component is taken as the fire risk level of the cable system bridge to be evaluated. The method has important guiding significance for cable system bridge fire risk assessment, fire prevention measure design and protection countermeasure formulation.

The invention provides a ship unmanned aerial vehicle cabin multistage fire alarm system and method based on edge computing, and the system comprises an intelligent shipborne system and a shore-based cloud system, the intelligent shipborne system is disposed in a ship cabin, and has the functions of data collection, data abnormity perception, fire monitoring and multistage early warning; the method is composed of three levels of data acquisition, edge processing and fire decision making. The shore-based cloud system is a cloud end of a shore-based system arranged on the land, has the functions of transmitting and receiving distress signals, storing remote data and tracing large fire accidents, and is composed of a communication unit, a storage unit and an alarm unit. The intelligent ship-borne system is connected with the shore-based cloud system through the satellite communication technology, infrared thermal imaging and multi-source sensing fusion is achieved, the device has the edge processing capacity, the multi-level fire judgment logic and the shore-based remote traceability function, and the device is suitable for the closed, complex and unattended ship engine room environment.

The invention relates to the technical field of fire safety management, and discloses a fire safety management supervision platform system. The system comprises a building information acquisition module for acquiring building structure data and environment monitoring data of a target building in real time; the risk area division module is used for dividing a plurality of independent fire risk areas according to the building structure data and distributing area identifiers; the historical data indexing module is used for indexing a historical fire accident data set and a fire-fighting facility maintenance record set of each region according to the region identifier; the dynamic risk analysis module fuses the environment monitoring data and the historical fire accident data set to generate a real-time fire risk coefficient sequence; the fire-fighting resource scheduling module is used for generating a fire-fighting resource allocation scheme based on the real-time fire risk coefficient sequence and the facility maintenance record set; and the emergency response decision module generates a multi-stage fire emergency response strategy according to the resource allocation scheme. The system improves the timeliness and pertinence of fire safety management.

The invention discloses a dangerous chemical accident analysis system and analysis method based on digital twinning. The method comprises the following steps: establishing a jet fire accident consequence model of a fire spread analysis unit; establishing a toxic gas leakage accident consequence model; establishing a pool fire accident consequence model; establishing a steam cloud explosion accident consequence model; setting coordinates, proportion and position attributes of the model in the process of importing the three-dimensional data of the chemical industry park; sensor real-time monitoring data are accessed through a data interface and serve as input parameters, and dynamic updating and visual effect display are achieved. Three-dimensional scene restoration under high resolution is realized through a digital twin technology, model influence parameters are interactively set in combination with a Web end interface, physical states and environmental factors of hazardous chemicals are monitored in real time, and dynamic simulation and analysis are performed through a digital twin model, so that early recognition and early warning of accident risks are realized. And the prevention and coping capability of dangerous chemical accidents is improved.

The present invention relates to the technical field of power cable manufacturing, and discloses a low-smoke halogen-free flame-retardant polyolefin sheathed power cable. The power cable outer sheath composite material comprises the following raw materials: metallocene linear low-density polyethylene, ethylene-vinyl acetate copolymer, high-density polyethylene, flame-retardant additives, high-temperature resistant components, antioxidants, cross-linking agents, and lubricants; by improving the flame retardant and high-temperature resistant properties of the polyethylene material, the prepared power cable has excellent mechanical properties, toughness, flame retardant properties, and high-temperature resistant properties, can work continuously and stably in a high-temperature environment, reduce the occurrence of fire accidents, and effectively prevent the spread of fire even in the event of a fire, and does not generate toxic hydrogen halide gas and thick smoke during combustion.

The invention discloses an evaluation method, device and equipment for fire fighting power deployment and a storage medium. The method comprises the following steps: acquiring fire accident associated data, constructing a fire accident scene model based on the fire accident associated data, and executing at least one fire-fighting power deployment scheme on the fire accident scene model to obtain multiple groups of fire-fighting feedback data, the fire accident scene model is a three-dimensional model for dynamically simulating a fire accident space layout, a fire environment and a disaster situation trend; for each group of fire-fighting feedback data, inputting the fire-fighting feedback data into a pre-trained fire-fighting evaluation model, and determining an evaluation index corresponding to the fire-fighting strength deployment scheme based on a model output result; and evaluating the fire-fighting power deployment scheme based on the evaluation index and a preset index threshold. And the accuracy and the reliability of the evaluation of the fire-fighting power deployment scheme are improved.

The present disclosure provides a fire response control method and system for a lithium battery energy storage box, relating to the technical field of lithium batteries, which comprises: collecting battery compartment layout information of the lithium battery energy storage box; reading data of the lithium battery energy storage box to obtain real-time control data; laying out temperature collection devices through the battery compartment layout information; obtaining temperature data collection results; collecting historical detection data with time sequence identifiers; constructing a lithium battery feature data set of the lithium battery energy storage box; constructing an abnormality monitoring model; outputting abnormality warning level information; generating multi-level fire response control data; and managing the lithium battery energy storage box. The technical problem of inaccurate and timely fire warning of the lithium battery energy storage box and inability to avoid fire accidents in time due to the single and inaccurate setting of the warning threshold in the prior art is solved.

The invention provides a building construction safety intelligent early warning and prevention and control system, and belongs to the technical field of building construction safety intelligent management. According to the invention, through GPS, sensor network and environmental parameter monitoring, dynamic perception of personnel behaviors, equipment states and construction environments is realized, high-place falling, mechanical faults and fire accidents are effectively prevented, a risk model constructed based on big data and machine learning can accurately identify accident rules, such as seasonal hidden dangers and equipment fatigue trends, and the safety of the system is improved. Traditional post-event processing is converted into pre-event prevention, personnel distribution, equipment states and environment data are displayed through a large screen and a mobile terminal, a manager can quickly allocate resources and balance safety and progress contradictions, a safety performance evaluation module generates a report through indexes of an accident rate and a hidden danger rectification rate, the safety management effect is quantified, and the management efficiency is improved. Weak links are helped to be positioned, risk model parameters and early warning rules are optimized regularly, and a PDCA cycle of'monitoring-early warning-prevention and control-evaluation 'is formed.

The invention provides a catering place area fire risk prediction method and system based on an XGBoost algorithm, and the method comprises the steps: constructing a catering place area fire risk prediction index system from the four aspects of man-machine-environment-management according to the actual condition of a catering place; historical fire accidents of the catering place are collected, the number of fire accidents of the regional catering place in each month is counted, and the fire accidents are fused with the fire risk prediction indexes to form an initial data set; performing standardization processing on the initial data set by adopting a standardization processing method, screening the fire risk prediction indexes by adopting a recursive feature elimination method, determining key indexes, forming an XGBoost model input data set, performing training and parameter adjustment on the XGBoost model, and constructing a catering place area fire risk prediction XGBoost model. And performing risk grade division on the result of the XGBoost model by using four grades of low risk, general risk, medium risk and high risk from low to high, establishing a catering place area fire risk prediction method, and predicting the risk of fire occurrence in catering place areas of all cities throughout the country. The method can rapidly and accurately predict the fire occurrence probability of the catering place area, determines the risk level of fire occurrence, and provides reference for fire control management.

The invention discloses a new energy automobile power battery thermal runaway wreckage extraction and cause judgment method. The method mainly comprises a survey sampling step, a wreckage extraction step, a wreckage current collector structure analysis step, a wreckage material powder crystal form structure analysis step and a material carbon component analysis step. According to the method, new energy automobile fire accident field investigation and laboratory analysis and detection technologies are systematically combined together, technical support is provided for analysis and detection of power battery wreckage in fire accident investigation, and an existing new energy automobile fire accident investigation system is effectively improved; and related accident investigators can conveniently carry out new energy automobile fire accident investigation and effective judgment of accident causes.

The invention provides a dangerous chemical fire accident tracing method based on RFID, and belongs to the technical field of fire tracing, and the method comprises the steps: configuring an RFID tag for each dangerous chemical container; based on a pre-deployed read-write network, information of each RFID tag is read and transmitted to a central data platform, and a dynamic information database of the dangerous chemicals is established; integrating the residual label information with a dynamic information database, tracing a position sequence and a state sequence of the dangerous chemicals before the fire occurs, and simulating a fire spreading path and an expansion trend of each path point on the spreading path according to the current fire situation and the residual label information of the dangerous chemicals; and comprehensively judging the cause of the fire accident and generating a traceability accident report. And the safety of dangerous chemical management is improved.

The invention provides a high-rise building fire rescue method based on visual inspection, and the method comprises the steps: deploying a camera cluster at the periphery of a high-rise building, carrying out the real-time monitoring of the high-rise building through the camera cluster, obtaining multi-dimensional perception information, and accurately judging the occurrence of a fire; meanwhile, the investigation unmanned aerial vehicle and an alarm mechanism are started, rapid response to a fire accident is achieved, the investigation unmanned aerial vehicle is used for obtaining real-time data information of a fire scene, a three-dimensional thermodynamic diagram model is established, a fire source is accurately positioned, the fire spreading trend is predicted, a reliable judgment basis is provided for rescue work, and fire spreading is controlled in a targeted mode; an emergency plan is automatically generated, a fire extinguishing unmanned aerial vehicle cluster is commanded to implement fire rescue work based on the emergency plan, and a fire fighting command center is assisted to quickly complete rescue work; the fire extinguishing unmanned aerial vehicle cluster also generates a fire-fighting disposal report after completing the fire rescue work, and sends the fire-fighting disposal report to a fire-fighting command center, so that a fire brigade can quickly and accurately carry out the rescue work.

The invention discloses a preparation method and application of light-cured resin, and the preparation method comprises the following steps: mixing organic silicon polyol, isocyanate and a second catalyst, and reacting to obtain matrix resin; and mixing the prepared matrix resin, an end-capping reagent and an optional polymerization inhibitor, and reacting to obtain the light-cured resin. The light-cured resin disclosed by the invention can be used as a UV material for protecting a battery shell, and overcomes the defects that the service life of a battery is shortened and fire accidents are caused as a blue film is soft, has bubbles and is not resistant to temperature. The cable has the characteristic of good flame retardance without adding a flame retardant, has excellent flame retardance, temperature resistance, flexibility and insulating property, and can realize automatic production.

The invention provides a path planning method, device and equipment for a new energy station based on digital twinning, and relates to an information processing technology in the field of new energy. In the application, a digital twinning intelligent operation and maintenance platform obtains information of each device, weather information and an accident position in a fire accident area in a digital twinning three-dimensional scene corresponding to a new energy station; determining a target parking position of the fire-fighting vehicle in the fire accident area according to the information of each device, the weather information and the accident position; and according to the predicted driving duration of the fire-fighting vehicle from the entrance position of the fire accident area to the target parking position, and the predicted number of the devices passing by by the fire-fighting vehicle, the probability of causing damage to the fire-fighting vehicle being greater than the first probability value, determining the optimal path of the fire-fighting vehicle driving from the entrance position to the target parking position. The method comprehensively considers various information in the fire accident area, can accurately plan the path which is more suitable for the fire-fighting vehicle to run, and improves the fire accident processing efficiency.

The present disclosure relates to an automatic transportation system that moves along a rail and is powered by induction feeding, and more particularly, to a terminal block configured to facilitate installation and extension of a cable for a configuration of an induction power track and to prevent a fire accident due to overheating in advance by an overheat detection unit provided therein and an automatic transportation system using the same.

At present, main fragrance products in the market comprise three types of fragrance candles, liquid fragrance and traditional burning incense. In the prior art, fire accidents are easy to occur, negative risks of PM2.5 to respiratory tracts of human bodies exist, articles are greatly wasted, degradation is not easy, fragile container products have potential harm to human and animals, and resources are wasted. The acceptability of people is lower than that of natural products. The inventor finds that the extracted remains and residues of plants have a large amount of aromatic substances for a long time, and the remains and residues of the plants are often directly discarded in the industry and are not wasted. Through six years of exploration, pure fragrance of a single plant without an adhesive acts on people, so that the people are benefited. And the product has the functions of a natural fragrance diffuser and an art ornament, and can be naturally degraded. The problem of treatment of plant residues and remains in an extraction factory is solved, and the plant residues and remains are effectively converted into high-added-value products.

The invention relates to the technical field of electrical parts, and discloses a charging switch control assembly and a platform-docking-free anti-occupation and anti-displacement charging system, the charging switch control assembly comprises a shell, and the inner bottom surface of the shell is provided with a first buffer mechanism; an iron core is arranged on the first buffer mechanism, and electromagnetic coils are arranged on two vertical sections of the iron core; a second buffer mechanism is arranged on the inner side wall of the shell, the second buffer mechanism comprises two supports arranged on the shell, guide rods are arranged on the supports, magnets are connected to the guide rods in a sliding mode, and magnetic poles of the magnets repel each other; a carrier plate is slidably connected to the guide rods, and a first spring is arranged between the carrier plate and the support. A through groove is formed in the top surface of the carrier plate, an armature is arranged in the through groove, and the armature is opposite to the iron core; a movable contact assembly is arranged on the carrier plate; a static contact assembly is arranged on the top surface of the shell; an arc extinguishing cover is arranged on the shell; by arranging the second buffer mechanism, the impact force of the armature on the iron core can be reduced, vibration is avoided, the bolt connection tightness is guaranteed, and fire accidents are avoided.

The utility model relates to an explosion-proof battery of an electric vehicle and an electric golf trolley applying the explosion-proof battery. The explosion-proof battery comprises an explosion-proof battery shell and a battery core assembly arranged in an inner cavity of the explosion-proof battery shell, at least one pressure relief opening is formed in the explosion-proof battery shell, and a cavity where the battery cell assembly is located is separated from the pressure relief opening through a breathable flame-retardant layer; and the explosion-proof battery shell is made of a metal plate. According to the explosion-proof battery disclosed by the utility model, combustion and explosion of the battery cell can be limited in the explosion-proof battery shell, explosives are prevented from splashing out, and meanwhile, flames can be isolated in the explosion-proof battery shell by the breathable flame-retardant layer, so that fire accidents are avoided, and the safety performance is improved.

The invention belongs to the technical field of image classification, and relates to a tunnel fire accident classification method, system and device based on a graph neural network, and a medium. The method comprises the following steps: collecting a field image of a tunnel fire accident, and preprocessing the field image to obtain a preprocessed image; and inputting the preprocessed image into a constructed tunnel fire accident classification model, and outputting a tunnel fire accident classification result. When a tunnel fire accident classification model is constructed, image data sets are randomly divided into three subsets, the first image data set is used for constructing a preliminary model, and a foundation is laid for subsequent training; the second image data set is used for supervising learning, so that the model is optimized towards a correct classification direction; the third image data set is used for performance evaluation to ensure that the model meets actual application requirements. The automatic fire accident classification model based on the graph neural network method can effectively reduce the missing report rate and the false alarm rate of a traditional monitoring system, improve the fire recognition rate and reduce the emergency response time.

The invention discloses a heat pipe micro-reactor sodium fire hot gas layer simulation calculation method. Firstly, the heat release rate of sodium fire is calculated according to the number of broken heat pipes and the sodium leakage rate; the working state of the heat pipe micro-stack is determined; when the heat pipe micro-stack is in a natural convection state, temperature and pressure rise caused by the sodium fire heat release rate is calculated; when the heat pipe micro-stack is in the forced heat exchange state, temperature and pressure rise caused by the sum of the sodium fire heat release rate and the heat transfer power of the heat pipe micro-stack heat exchanger is calculated. According to the method, the simulation calculation of the heat pipe micro-reactor sodium fire accident can be quickly, simply and conveniently realized, and guidance can be provided for the safety design and structure optimization of the heat pipe micro-reactor. The invention further provides a heat pipe micro-reactor sodium fire hot gas layer simulation calculation device and a safety analysis system.

The invention discloses a novel mixed ventilation method for tunnel hydrogen energy fire accident safety rescue. The novel mixed ventilation method comprises the steps that a multi-shaft tunnel model with a mixed ventilation system is established; a novel mixed ventilation mode is provided based on the advantages and disadvantages of the existing ventilation mode; comparing the influence of different novel mixed ventilation modes on the length of the hydrogen jet fire back layer and the temperature in the tunnel; the invention provides a novel mixed ventilation method with a speed prediction model for tunnel hydrogen energy fire accidents. According to the method, a novel mixed ventilation mode suitable for handling hydrogen energy fire accidents in the tunnel is provided on the basis of different ventilation mode-ventilation speed-temperature distribution conditions, a dimensionless prediction model of the critical longitudinal ventilation speed is established, and the danger of hydrogen jet fire in the tunnel is reduced; rapid selection of the ventilation mode and rapid prediction of the ventilation speed when the hydrogen jet fire occurs in the tunnel are achieved, and the method makes up for the limitation of a traditional single ventilation mode on hydrogen energy fire prevention and control.

The embodiment of the invention provides a three-phase circuit series fault arc detection method and device under a vibration condition, and the method comprises the steps: collecting a current signal of a three-phase loop under the vibration condition during the load operation period of a three-phase motor and a frequency converter; inputting the current signal into a pre-trained fault arc identification model, and outputting a prediction result of the current signal; and determining the phase selection positioning of the series fault arc according to the prediction result of the current signal. In this way, the fault arc occurring in the load circuit of the three-phase motor and the frequency converter can be timely and accurately detected, the fault phase can be positioned, the operation reliability of the circuit of the three-phase motor and the frequency converter can be improved, and the electrical fire accident caused by the series fault arc can be prevented.

The present invention relates to a distribution board having a disaster prevention function and, more specifically, to a distribution board having a disaster prevention function, in which damage and malfunction due to an impact are prevented by providing a function of being vibration-proof against an external impact applied in various directions due to ground movement when an earthquake occurs, and in addition, a quick follow-up measure for protecting the distribution board from an earthquake occurrence can be performed by detecting and monitoring, in real time, whether an earthquake has occurred, an occurrence period, the size of an impact, and the like, and not only pieces of detection information can be used as information data for establishing a damage prevention measure of the distribution board with respect to an earthquake, but also damage to a high voltage power facility of a distribution apparatus and a large-scale disaster, which may occur due to a fire accident caused for an unexpected reason, can be prevented.

The invention relates to a regional fire risk dynamic assessment and early warning method for an urban tunnel. The method comprises the following steps of: gridding the tunnel by taking tunnel infrastructure as a reference object; obtaining a tunnel fire accident database, and constructing a tunnel fire risk assessment index system; considering the influence of the index on the fire risk and the influence of the mobile index on spatial distribution, and determining an index weight; determining an index membership threshold, calculating an index membership degree, and obtaining a real-time initial fire risk assessment result of each region; early warning parameters are reasonably selected, the initial fire risk assessment result is corrected in combination with the single index risk, and a final regional fire risk assessment result is obtained; setting an early warning threshold value of each index under different evaluation results based on the final evaluation result of the regional fire risk occurrence probability; and comparing the index early warning value according to the index data measured by the risk sensing equipment, and outputting a single-index fire risk early warning result to realize single-index fire risk early warning. The method is high in pertinence, high in accuracy and high in sensitivity.

The invention provides a method and system for detecting abnormity of a load switch of a low-voltage meter box, and the method comprises the steps: obtaining the target parameter information of a target low-voltage meter box, and screening the meter information in the target parameter information; the number of meters in the screened target parameter information is determined, if the number of meters in the screened target parameter information is larger than a preset first number threshold value, phase-by-phase checking is conducted on phase lines of the meters according to a preset checking standard, and a corresponding checking result is obtained; and determining whether the load switch corresponding to the meter is abnormal or not according to the troubleshooting result, and if so, outputting a corresponding alarm signal. The low-voltage load switch with poor contact can be found in time, loss of national assets caused by electric charge loss is avoided, electric appliance fire accidents are avoided, manpower and material resources can be saved, economic losses of an electric power department are reduced, and electric fire safety accidents are avoided.

The invention provides a reactive flame retardant for transparent resin and flame-retardant acrylic resin, the reactive flame retardant for transparent resin is THPO-AA or THPO-MAA, the molecular formula of the THPO-AA is as shown in the formula (1), and the molecular formula of the THPO-MAA is as shown in the formula (2). The flame retardant provided by the technical scheme of the invention has good compatibility with acrylic resin, and does not affect the transparency of the acrylic resin. In addition, THPO-AA contains hydroxyl, so that the adhesive force of THPO-AA to a base material can be improved. When the flame-retardant acrylic resin is used for LED packaging, the light extraction efficiency of an LED can be improved, chip heating is reduced, the service life is prolonged, meanwhile, the flame retardant property of the packaging resin is improved, the fire accident risk is reduced, and the flame-retardant acrylic resin has very important economic and social significance.

The utility model discloses a delayed gas cut-off protection system for a residential kitchen gas stove, which is characterized in that a gas pipeline opening and closing stop valve and a gas pipeline electric valve are sequentially mounted on a gas pipeline in series, and an inductive switch controller and a time relay are respectively mounted on one side of an inductive switch; the load output end of the inductive switch controller is connected to the input end of the time relay and the input end of the smoke exhaust ventilator through lines. The output end of the time relay is connected with the input end of the gas pipeline electric valve through a line I; the signal acquisition end of the inductive switch controller is also connected with an inductive switch through a circuit; the inductive switch is installed at the position close to the gas pipeline opening and closing stop valve. During cooking, the gas pipeline stop valve, the interlocking inductive switch, the interlocking starting exhaust fan and the interlocking starting time relay are manually opened. If the fire is forgotten to be turned off and the set time is exceeded, the electric stop valve is automatically closed to prevent the pot from being burnt out, so that fire accidents are prevented.

The invention relates to a water spraying system capable of inhibiting flash explosion fire on a drill floor, which belongs to the technical field of fire extinguishing systems of drilling platforms and comprises a water tank, a submersible pump, a steel pipeline and a directional spray head, a plurality of steel pipelines with directional sprayers are arranged upwards from a derrick of a drilling machine to a crown block, the directional sprayers are of tubular structures, the two ends of each directional sprayer are in screwed connection with the steel pipelines, the steel pipelines are connected through bent connectors, and the steel pipelines are in threaded connection with the bent connectors. The water spraying system is easy to install and convenient to control, manual / automatic control can be directly conducted by a specially-assigned person, water mist is fully distributed in the space from the drill floor face to the top of the crown block, and flash explosion and fire accidents caused by the fact that the concentration of flammable and explosive hazardous gas reaches the explosion limit are prevented.

This application relates to the field of vehicle technology and discloses a risk avoidance control method, device, electronic equipment, vehicle, and storage medium. The risk avoidance control method includes: when the vehicle is in an unattended parking state, acquiring the vehicle's system performance parameters and the fire characteristic parameters of the vehicle's environment, where the unattended parking state refers to the vehicle being parked and stationary, without any driving or passenger movement; if the fire characteristic parameters indicate a fire risk in the vehicle's environment, then based on the system performance parameters, assessing the degree of performance degradation of the vehicle under the fire risk to determine the vehicle's remaining mobility; generating a target risk avoidance path based on the vehicle's remaining mobility and the fire characteristic parameters; and controlling the vehicle to avoid the fire according to the target risk avoidance path. This enables timely risk avoidance of the vehicle from fire risks when no one is present, reducing property damage caused by vehicle fire accidents and ensuring public safety.