2844 results about "Fire hazard" patented technology

A flame retardant smoke resistant wood plastic composite material relates to a wood plastic composite material, which solves the disadvantages of low flame retardant performance, big smoke mass, large addition of flame retardants, increased cost and decreased mechanical property of existing wood plastic composite materials. The product of the invention is mainly formed by polystyrene and/or polyvinyl chloride fortified with heat stabilizers, lignocellulose, intumescent flame retardant, compatibilizer, lubricant. The flame retardant and smoke-resistant performance of the product of the invention is greatly improved. For wood powder/ polystyrene composite material, compared with no addition of flame retardant, the average heat release rate is decreased by 48 percent, the quantity of smoke yield is reduced by 30 percent and the CO yield is decreased by 28 percent during combustion. The product of the invention has high oxygen-index, long ignition time and no droplet, which greatly reduces the fire hazard of the material, and the appearance of the material is similar with wood. The product of the invention also has low cost, wide application range and good creep resistance, forming performance and mechanical property.

An electrically operated scented wax holder that forms a receptacle for receiving unmelted blocks of wax which are heated to the melting point and thereafter maintained at a safe temperature by a temperature-regulated electrical heating element. The wax receptacle is removable mounted on a base section that houses a positive temperature coefficient (PTC) thermistor which has a transition temperature substantially higher than the melting point of the wax to insure that the wax is rapidly melted, but substantially below the temperature that would constitute a danger to a human who might touch the exterior surface of the warmer, or constitute a fire hazard. The heating element is preferably placed in thermal contact with a contact pad having high thermal conductivity that is in turn placed closely adjacent to the wax receptacle, thereby efficiently transferring heat from the electrically operated temperature regulated heating element to the wax in the receptacle. A switch is positioned to de-energize the heating element whenever the wax receptacle is removed from the base section, and a visible pilot light is illuminated whenever the heating element is energized.

An aircraft floor heating panel is constructed for mechanical strength and to meet special heating requirements next to a door in an aircraft. The panel has a lightweight core. Each surface of the core is first covered with at least one carbon-fiber reinforced composite layer for protection against deterioration. Each carbon fiber layer in turn is covered by a glass fiber reinforced composite layer for mechanical strength. A foil heater is arranged inside the composite panel coextensive with at least a portion of the panel area. A heat distributing metal plate covers the panel as an upper step-on surface. A heat insulating layer is bonded to the panel opposite the heat distributing metal plate. A triple heat control is provided for an increased safety against fire hazards.

Articles, including fabrics and film layers, are disclosed which can protect against multiple hazards, including radiation, chemical, biological agents, metal projectiles and fire hazards. In some embodiments, the fabrics and films of the present invention are used to produce garments having protection against multiple hazards and superior heat dissipating properties. A radiation protective compound is preferably created by mixing a radiopaque material, such as barium, bismuth, tungsten or their compounds, with powdered polymer, pelletized polymer or a liquid solution, emulsion or suspension of a polymer in solvent or water. This radiation protective mixture can then be laminated or otherwise adhered to other types of protective films or fabric, such as the protective polymer films or fabrics used for chemical protective garments, biological protective garments, bullet proof vests or fire retardant garments. The principles of this invention can also be applied to a broad range of other articles including surgical hoods, hospital gowns, gloves, patient drapes, partitions, coverings, jumpsuits, ponchos, uniforms, fatigues, tents, probes, envelopes, pouches, wallpaper, liners, drywall, house sidings, house foundations, house roofings etc.

The invention discloses a method for recognizing video fire smoke image based on optical flow, which is characterized in that: optical flow of corners and points in smoke motion regions is extracted by a computer based on the video image obtained by a surveillance camera; whether the smoke is fire smoke is judged based on the set threshold by calculating the average and variance of the array consisting all corner and point optical flow speed in the foreground image and the average and variance of the array consisting optical flow speed directions; if a fire smoke is identified, the computer sends orders which controls the alarm to send alarm signals and controls the interlocked fire extinguisher to start the fire extinguishing function quickly; if a fire smoke is not identified, the first step is returned to. The method provided by the invention can not only accurately reflect the motion characteristics of smoke, reducing light interference and impact of similar pixels on the results, but also reduce computation and improve practicality. The method can greatly reduce false alarm rate and quickly and accurately realize fire smoke detection function.

The invention discloses a method for identifying flame by video, a method for monitoring fire, and a system thereof. The method for monitoring fire comprises the following steps: acquiring video image, establishing a background model, and detecting prospect target in the video image; transmitting the image of the prospect target to a server end; judging which target points of the prospect target are color points of flame according to the color model of the flame established by training image; carrying out cluster analysis on the color points of the flame of the prospect target to acquire a flame area of the prospect target, and matching the prospect targets of the front and rear frame images; judging whether flame occurs in the flame area; when the matching relation exceeds the set threshold value; carrying out verification of a alarming verification mechanism when judging that flame occurs in the flame area; and when satisfying the warning condition, performing warning. The inventionhas wider range of application without limiting distance of scene, and achieves intelligentized processing.

The invention relates to a method for identifying and detecting flame of a tunnel fire hazard. The method comprises the following steps: performing a pretreatment of eliminating illumination on an input video stream; performing motion detection on the video stream to obtain a moving pixel; performing color detection on the video stream to obtain a color pixel with flame characteristics; searching communication areas which are formed by all mutually connected pixels according with same characteristics; calculating out the perimeters and the areas of the obtained communication areas to perform shape analysis; and performing area variation analysis on each communication area to finally judge whether a fire hazard happens. The method, based on a fire hazard detection system with image processing, can correctly identify flame information from an image sequence with background noise according to the characteristics of flame images that the color, the shape and glittery characteristic, the position, the area and the brightness of the flame images change over time, thus the method can separate the real flame from a glittery vehicle lighting in a tunnel, greatly reduce the false alarm rate, and achieve the aim of fire hazard monitoring.

The invention relates to the technical field of fire hazard safety, and especially relates to an experiment device and an experiment method for gas cloud combustion, explosion simulation and inerting, inhibition. The device comprises an experiment test system composed of an explosion experiment container tank, a flame and explosion pressure radial propagation detection device, an ignition device, a generated gas sampling analyzer, and a high-speed schlieren and data acquisition, a sample introduction system, a combustion explosion inerting inhibition system, and a control system composed of wireless synchronous control and computer remote monitoring, and is a multifunctional comprehensive experiment platform device. The invention realizes 180-degree rotation of the tank, data synchronous acquisition, gas distribution and sample introduction with precise proportions, synchronous and delayed multimode ignition and inhibition system ejection; wireless and wired data transmission is adopted for control; man-machine separation of the tank and the controlling person is realized; safety and reliability of data transmission are guaranteed; combustion or explosion and inerting and inhibition experiments of various experiment samples such as gas cloud, dust, oil mist, and the like can be carried out when the tank is in a vertical or horizontal state.

The invention discloses a method for detecting fire disaster smog by video on the basis of color saturation and motion mode, which comprises the following steps: firstly, extracting a foreground motion block from a video image acquired by a monitoring camera through a difference method; secondly, detecting the color saturation of the foreground motion block, estimating the direction of the motion block, and calculating the cumulant and the main moving direction of the motion block; and thirdly, calculating the color saturation detection percentage of each region, the average cumulant and the main moving direction ratio to form a characteristic vector, and adopting a Bayesian classifier to judge whether the smog is the fire disaster smog. The detection of the color saturation reflects a rough color distribution of the smog and eliminates a large amount of foreground interfering objects with glowing colors. The color detection in a blocking mode further improves the anti-interference performance of a system. The cumulant shows the characteristic of continuous movement nearby a smoldering point of the smog, and has very good anti-interference performance for a non-reciprocating object. The comprehensive utilization of the color saturation detection percentage, the average cumulant and the main movement ratio can greatly reduce the rate of false alarm for the system.

The invention provides a system and a method for detecting a fire hazard based on wireless multi-sensor information fusion. The system comprises a sensor terminal node and an intelligent gateway, wherein the sensor terminal node establishes a data transmission network of a fire hazard monitoring field by using the ZigBee technology; the intelligent gateway is accessed into the Internet and a general packet radio service GPRS (general packet radio service) network based on an ARM11S3C6410 (Advanced RISC Machine 11S3C6410) chip; and a user can obtain the monitoring information while accessing to an embedded server. Once the fire hazard is detected, the alarm information is transmitted to a cell phone of the user through a GPRS module; a plurality of sensors of smoke, temperature, carbon monoxide CO gas and the like are utilized to sense the burning state of the fire; different trust degree functions are distributed according to that whether the fire hazard happens; and a D-S evidence theory is fused with three sensor information so as to judge the state of the fire hazard. With the adoption of the system and the method, the defect of wired scheme of a traditional fire hazard monitoring system is modified; and the system and the method can be used in families and industrial environments with wiring inconvenience and reduced cost widely.

The invention provides a fire detection system and a method thereof. The system comprises a video collection module, a flame judging module that extracts flame characteristic parameters from video images collected and carries out statistical analysis according to the flame characteristic parameters so as to calculate the flame probability of occurrence of a detection area, a smoke judging module used for extracting smoke characteristic parameters and carrying out statistical analysis according to the smoke characteristic parameters so as to calculate the smoke probability of occurrence of a detection area, a fire judging module that carries out fusion calculation according to the flame probability of occurrence and the smoke probability of occurrence so as to determine fire probability of occurrence, a fault judging module used for identifying fault information and an alerting module used for making a comparison between the probability of occurrence of flame, smoke and fire and a preset threshold value and sending out alerting information according to a comparison result. The fire detection system and the method of the invention can simultaneously realize the detection and alerting of flame and smoke, especially has very good identifying capability of the smoke at the initial period of fire and has the function of early alerting.

The invention relates to a water soluble polyether quenching medium for quenching a metal material, which comprises the following components in percentage by weight: 1 to 30 percent of water soluble polyether, 0.1 to 1.0 percent of antirusting agent, 100 to 500ppm of defoaming agent, 0.1 to 1.0 percent of composite germicide, 0.2 to 2 percent of pH regulator and the balance of water, wherein the water soluble polyether is a condensation compound of ethylene oxide and propylene epoxide and a number-average molecular weight is less than 20,000. The water soluble polyether quenching medium is characterized by solving the problems of insufficient hardness of oil quenched workpieces and cracking and deformation of water quenched workpieces, reducing fire hazards in quenching, improving production safety, avoiding oily fume discharge, reducing environment pollution, improving working environment, contributing to the body and mind health of workers, along with readily available raw materials,simple production process, low price, excellent antirusting, defoaming and antibacterial performance, wide quenching cooling speed range and cooling speed ranging from oil quenching cooling speed andwater quenching cooling speed.

The present invention relates to a forest fireproofing early warning system which is composed of a wireless internet server, a monitoring system, at least two fireproofing detector and at least one wireless transmission base station. The present invention is characterized in that a wireless fire alarm detection and fire alarm information transmission net is formed by at least two fireproofing detectors; the wireless transmission base station is in the wireless fire alarm detection and fire alarm information transmission net; each fireproofing detector is used for detecting fire hazards to generate early warning signals, and short-distance wireless early warning signals are transmitted between adjacent two fireproofing detectors to the wireless transmission base station directly; the wireless transmission base station and the wireless internet server are communicated wirelessly; and the wireless internet server is connected with the internet of the monitoring system. The present invention has the advantages of convenient construction and arrangement, wide monitoring range, without communication cables and safe use, and can timely monitor the fire hazards and judge the pervasive conditions of the fire hazards.

The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.

The present invention provides an unmanned aerial vehicle real-time map reconstruction method. By applying an unmanned aerial vehicle, the three-dimensional maps of the surrounding environment of the unmanned aerial vehicle are obtained, and the own positioning of the unmanned aerial vehicle is realized. According to the method, the unmanned aerial vehicle flies in the unknown airspace, and on the condition that the own position of the unmanned aerial vehicle is not clear, the own positioning of the unmanned aerial vehicle is obtained and the three-dimensional maps are constructed by detecting and comparing the environmental information, and extracting and matching the feature information of the environment. The unmanned aerial vehicle real-time map reconstruction method also comprises the geographic information fusion and an image mosaic technology. The unmanned aerial vehicle real-time map reconstruction method of the present invention can be applied to the fields, such as the battlefield demands, for example the unmanned aerial vehicle autonomous flight and attack, the disaster emergency rescue, such as fire hazard, earthquake, flood, etc., the unmanned aerial vehicle security administration and monitoring, etc. Compared with the conventional method, and according to the present invention, a position drifting amount, an angle drifting amount or an absolute error is above the average, and more environmental information is obtained. Moreover, compared with a full-density method, an experimental precision of the method still can reach a usage standard, and the method can be operated on a CPU directly and is good in real-time performance.

The invention discloses a high-usability high-reliability and high-efficiency fire evacuation indicating system and a method. The system adopts a three-layer system structure formed by an evacuation indicating control host machine, passageway evacuation indicating control sub machines and passageway detection/indicating devices, wherein the passageway evacuation indicating control sub machines are positioned at stairs of each floor, each unit of the system exchanges information through an element interconnect bus (EIB), and the passageway detection/evacuation indicating devices are directly embedded into the control sub machines. Wireless backup communication is additionally added between the host machine and the sub machines (the passageway detection/evacuation indicating devices), and the integral reliability and the usability of the system are enhanced. The secondary threshold warning strategy of a composite fire hazard detector is adopted, a corresponding information processing method is used as an auxiliary measure, in addition, evacuation paths are continuously regulated according to the real-time fire conditions, the goals of shortening the warning time and reducing the mistake warning rate are reached, and the usability of the evacuation indicating system is further improved. The space positions of the detection/indicating devices are shown according to the floors on the basis of the three-dimensional geographical characteristics of the tall building evacuation paths, the building typical evacuation structure and the Dijkstra algorithm with an improved data structure are adopted, and the route planning efficiency of the escape route is improved.

A construction method of an open excavation prefabricated underground structure includes the steps: 1, leveling a ground to serve as a foundation pit supporting structure and a base cushion layer; 2, mounting a fixing support at an assembly initial end; 3, hoisting prefabricated components to assemble a structural base plate; 4, assembling a special assembly trolley on the structural base plate; 5, assembling side walls and top plates of the prefabricated components; 6, backfilling upper portions of the top plates and outer portions of structural side walls to complete assembly of the underground structure. The construction method has the advantages that construction mechanical level is improved; operating personnel amount is greatly decreased, operating efficiency is improved, engineering construction quality is improved, resource consumption is reduced, environmental influences are lowered, and construction period can be greatly shortened; amount of mould plates in cast-in-situ concrete structures, peripheral shields, scaffolds and wastes is greatly decreased to relieve field operation intensity and reduce construction input; construction in chilly winter is realized, engineering construction quality is improved, and potential safety hazards such as fire hazards and the like in construction of traditional cast-in-situ concrete structures in winter can be avoided.

A modular fire detection and extinguishing system is disclosed that is inexpensive, compact, and modular to allow easy aftermarket installation in a variety of vehicles. The system may include a detector, a trigger coupled to the detector and a gas generant fire extinguisher, a modular distribution line in fluid communication with the extinguisher and a nozzle. The system allows exhaust gas from the gas generant fire extinguisher to carry dry powdered fire suppressant from the fire extinguisher and through the nozzle to disperse the fire suppressant substantially uniformly throughout a fire hazard zone. The extinguisher is installed such that exhaust gas must aerate substantially all the fire suppressant before exiting the extinguisher.

The invention discloses an anti-static polytetrafluoroethylene filter bag and a preparation method thereof. The anti-static polytetrafluoroethylene filter bag comprises a bag head, a bag body and a bag bottom, wherein the bag head is made from a polytetrafluoroethylene filter material; the polytetrafluoroethylene filter material comprises a base cloth; the base cloth is weaved through warps and wefts by twisting polytetrafluoroethylene filament fibers and stainless steel fibers; the upper surface and lower surface of the base cloth are symmetrically covered with non-woven layers; the non-woven layers are prepared by blending polytetrafluoroethylene fibers or one or more of the polytetrafluoroethylene fibers, polyphenylene sulfide fibers, polyamide fibers, polyamide-imide fibers and glass fibers; and the overlapped edge of the bag body is provided with a stainless steel wire mesh layer. The filter material prepared through the method disclosed by the invention has the advantages of good high temperature resistance, corrosion resistance and electric conductivity and persistent static elimination, reduces the fire hazard or explosion generated due to electrostatic sparks and can be widely applied to the high-temperature fire prevention, explosion prevention and dust removal in the fields of iron and steel smelting, refuse burning, a coal-fired power plant, cement, chemical industry, and the like.

The invention discloses a tail gas buffer dilution treatment method for safe emission of hydrogen from a fuel cell vehicle and a device thereof. The device comprises a hydrogen buffer, a flow control valve, a draining valve, a flame arrester, an earth terminal, an emergency hydrogen exhaust valve, a hydrogen sensor and a control module. The pulse hydrogen emitted from an anode side of the fuel cell is firstly buffered by the buffer, and a small stream of air introduced from an air path emitted from the cathode side dilutes and sweeps the hydrogen in the buffer; then the diluted hydrogen emitted from the buffer and the gas from a main air pipeline are mixed, thus the volume concentration of the tail hydrogen emitted from the fuel cell vehicle is controlled below the explosion limit concentration 4%, and the purified water discharged from a condenser can be recycled. The tail gas buffer dilution treatment device utilizes the techniques of self-diffusion, multi-tube pass buffer, air mixing and exchange, expansion, condensation and the like to buffer and dilute the hydrogen-containing tail gas emitted from the fuel cell vehicle and separate the water and gas in the hydrogen-containing tail gas, thus eliminating the possible fire hazard and ensuring the safe running of the fuel cell vehicle.

A range hood comprising a hood body, a ventilation fan inside a continuous pipe; a water container is on the bottom of the hood body, a removable board is on the front side of the hood body, a filter net is in between from inside of the removable board to the continuous pipe. Based on the described above; water level in the water container is above the bottom of the removable board and the filter net, when the ventilation fan is on, air is sucked in from the inlet pipe, the soot is also sucked in; the air flow rushes from water surface and flows from the bottom of the removable board and turns to the filter net, and forms a small water curtain between removable board and the filter net; the present invention achieves washing, sucking particles and dust, prevent fire hazard, water recycling and easy to maintain effect.

The invention discloses a forest fire hazard emergency command decision management GIS three-dimensional platform. The platform comprises a high-precision three-dimensional electronic sand table, basic geographic data management, forest fire prevention thematic data management and map display, real-time meteorology display, fire scene real-time meteorology, real-time video monitoring, fire scene real-time videoing, vehicle personnel positioning tracking and command navigation, three-dimensional simulation control, forest fire diffusion simulation and map display, trend plotting management, and a three-dimensional analysis tool. By using the platform provided by the invention, a fire suppression commander can master fire scene meteorology and fire development trend and change in real time, master the positions of fire fighters and vehicles and travel routes in real time, and accurately master the distribution and quantity of fireproof materials, scientific and effective strategies and tactics and fire suppression schemes can be mapped out, fire suppression personnel and materials can be rapidly scheduled, various fire suppression parties can be coordinated, personal safety of the fire suppression personnel can be guaranteed, fire suppression supply is ensured, and a fire can be extinguished in a highly-efficient manner.

The invention discloses a double-wave band image identification fire detection alarm system and the monitoring method thereof. Solving the problem that current image alarms are likely to give wrong warning, invention has the advantages of simple structure, convenient use, and high alarm accuracy. The structure is as follows: The system at least includes a detector and a power source. The detector is a double-wave band image detector; the output end of the detector is connected with a video distributor, whose one output is connected with the normal circuit monitoring system, and another output connected with an image collection device. The image collection device is connected with a computer, which is connected with a linkage controller. The linkage controller is connected with alarm and rescue devices separately.