32results about How to "Curb spread" patented technology

The invention discloses a production method of distiller's grain fermentation liquid fertilizer specially applied to roxburgh rose. The distiller's grain fermentation liquid fertilizer is prepared bythe step of evenly mixing 50 to 80 parts of distiller's grain fermentation extracting solution, 0.5 to 1 part of microelement, 5 to 10 parts of seaweed meal, 5 to 10 parts of natural active organism,2 to 5 parts of potassium bicarbonate, 2 to 5 parts of natural active organism and 2 to 5 parts of natural surface active agent. A preparation method of the distiller's grain fermentation extracting solution comprises the steps: evenly stirring 50 to 80 parts of distiller's grain, 50 to 150 parts of rice washing water, 1 to 2 parts of EM microflora fermentation liquid and 0.5 to 1 part of sugar, performing composting fermentation at the room temperature to obtain a distiller's grain fermentation material, stirring and extracting through a sodium carbonate water solution, filtering and performing evaporation and condensation on obtained filtrate until the density is 1.1 to 1.2 to obtain distiller's grain fermentation extracting solution. The distiller's grain fermentation liquid fertilizerdisclosed by the invention has a good use effect, meanwhile can effectively prevent pest and disease damage to the roxburgh rose and is high-efficiency environment-friendly liquid fertilizer.

The utility model discloses a mounting structure of a patch type perfluorohexanone fire extinguishing device. The mounting structure comprises a patch type perfluorohexanone fire extinguishing device body, a guide groove and a magnetic attraction layer, the guide grooves are symmetrically formed in the mounting surface of the patch type perfluorohexanone fire extinguishing device body, fire extinguishing ropes are arranged in the guide grooves in a penetrating mode, the patch type perfluorohexanone fire extinguishing device body is further provided with penetrating holes communicated with the guide grooves, and the magnetic attraction layer is bonded to a bonding layer of the patch type perfluorohexanone fire extinguishing device body in a peelable mode. The adsorption device is used for adsorbing the patch type perfluorohexanone fire extinguishing device body on a cabinet body. The utility model belongs to the technical field of patch type perfluorohexanone fire extinguishing, and particularly relates to a mounting structure of a patch type perfluorohexanone fire extinguishing device.

The present application belongs to the technical field of high-performance nylon fiber materials, and particularly relates to a preparation method of antibacterial modified high-performance nylon fiber. The preparation method comprises the following steps: S1, a triazine ring-containing dicarboxylic acid is prepared by taking cyanuric chloride, 4-amino-2,2,6,6-tetramethylpiperidine and p-hydroxybenzoic acid as raw materials, triphenylphosphine oxide is subjected to nitration treatment and reduction treatment to obtain tris(3-aminophenyl)phosphine oxide, and the triazine ring-containing dicarboxylic acid and the tris(3-aminophenyl)phosphine oxide are mixed for a synthesis reaction to obtain modified hyperbranched polyamide; S2, polyamide masterbatch, modified hyperbranched polyamide, antibacterial material, zinc stearate and antioxidant are melt blended, extruded and granulated to obtain modified nylon chip; and S3, the modified nylon chip is subjected to melt spinning to obtain antibacterial modified high-performance nylon fiber. The present application not only ensures that the fiber has good antibacterial performance, but also effectively improves the breaking strength and flame retardant performance.

The invention discloses a low-smoke halogen-free flame-retardant cable for a charging pile, and belongs to the technical field of cables. The cable sequentially comprises a conductor, an insulating layer and an outer sheath layer from inside to outside, the conductor is formed by mutually twisting copper-tin alloy wires; the insulating layer is made of butadiene styrene rubber; the outer sheath layer is prepared from the following components in parts by weight: 40 to 60 parts of high-density polyethylene, 15 to 20 parts of acrylate rubber, 10 to 15 parts of ethylene-vinyl acetate copolymer, 8 to 10 parts of modified silicon dioxide, 3 to 8 parts of compatilizer, 1 to 2 parts of antioxidant and 1 to 2 parts of lubricant. The prepared modified silicon dioxide is used as a flame-retardant reinforcing component in the outer sheath layer, and the comprehensive performance of the low-smoke halogen-free flame-retardant cable for the charging pile can be remarkably improved.

The application relates to the technical field of packaging materials, in particular to a high-strength flame-retardant packaging material and a preparation method thereof. According to weight parts, the packaging material comprises the following raw materials: 70-90 parts of polylactic acid, 6-12 parts of polybutylene adipate terephthalate, 4-15 parts of a flame retardant, 3-7 parts of modified montmorillonite, 3-5 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of an antioxidant and 0.5-1 part of a lubricant. The packaging material has excellent flame-retardant performance, bacteriostatic performance, barrier performance and mechanical performance.

This utility model relates to the field of forest belt construction technology, specifically an integrated automatic drip irrigation and monitoring device for biological firebreak forest belt construction. It includes a base, with a dosing tank fixedly installed on the upper left side of the base. The dosing tank has a dosing inlet on its upper left side. A stirring assembly, including a motor, is fixedly installed in the middle of the upper part of the dosing tank, and a stirring rod is fixedly connected to the motor's rotating shaft. A first connecting pipe is fixedly connected to the lower right side of the dosing tank, and the other end of the first connecting pipe is fixedly installed on a water pump. A smoke sensor detects early fire smoke, triggering an alarm and linking the irrigation system (such as emergency water spraying for cooling) to curb the spread of fire. In high fire risk periods or areas prone to lightning strikes, rapid response can prevent small fires from escalating into major disasters. A humidity sensor monitors soil moisture in real time, and a controller automatically controls the solenoid valve to achieve precise drip irrigation.

The invention discloses a high-strength power cable which sequentially comprises a special-shaped stranded conductor, a layered tooth-shaped insulating layer, a honeycomb-shaped filling layer, a spiral armor layer and a composite sheath layer from inside to outside. The invention discloses a manufacturing method of a high-strength power cable. The manufacturing method comprises the following steps: S1, manufacturing a special-shaped stranded conductor; s2, forming a layered tooth-shaped insulating layer; s3, assembling the honeycomb-shaped filling layer and the spiral armor layer; and S4, forming the composite sheath layer and processing a finished product. The occlusion type structure of the special-shaped stranded conductor is matched with the graphene modified conductive paste, so that the tensile strength and the structural stability of the conductor are greatly enhanced, and deformation and strand breakage are effectively avoided; the stainless steel wire armor layer which is locked in a reverse spiral mode improves shock resistance and extrusion resistance with high coverage rate and pre-tightening force, and meets flexible laying requirements. And due to the adaptive structure and the wave-shaped design of the composite sheath layer, the interlayer binding force is optimized, and the cable is endowed with excellent wear resistance, aging resistance and bending resistance.

The application discloses a kind of efficient flame-retardant lithium ion battery separator and preparation method thereof, belong to lithium ion battery separator technical field.The battery separator is coated by roll coating or spraying mode, ceramic slurry consisting of ceramic main material and halogen flame retardant, flame retardant additive, binder and other key additives is coated to the surface of base film, after vacuum drying, obtain the lithium ion battery separator with efficient flame retardancy and thermal stability.The application utilizes the synergistic effect of halogen flame retardant and flame retardant additive at high temperature, effectively captures burning free radicals and dilutes oxygen, realizes efficient flame retardancy;At the same time, the ceramic coating gives the separator excellent thermal stability.The separator can significantly improve the safety performance of lithium ion battery under abuse conditions, and the preparation process is simple and easy to industrial production.

This invention discloses an anti-burning foam fire extinguishing agent for lithium batteries and its preparation method, relating to the field of fire extinguishing agent technology. The anti-burning foam fire extinguishing agent for lithium batteries prepared by this invention mainly comprises a foaming agent system, a foam stabilizer, and a heat-absorbing material. The foaming agent system contains sodium perfluorocrown ether sulfonate, the foam stabilizer is modified silica, and the heat-absorbing material contains modified microcapsules. The anti-burning foam fire extinguishing agent for lithium batteries prepared by this invention exhibits good foam stability and fire extinguishing performance.

The present application relates to the technical field of server virtualization, in particular to a server virtualization system big data computing power resource dynamic allocation method, comprising the following steps: intercepting request calculation time deviation and generating end-to-end delay, extracting queue length and request number to obtain each response time, comparing feature indicators with corresponding threshold values to output abnormal state, calculating comprehensive stress score according to index weighting and normalization result, locking stress source and issuing scheduling parameter acquisition configuration combined with business importance. In the present application, the underlying congestion link is identified by capturing micro-latency combined with queue fluctuation, the overall hardware pressure state is quantitatively integrated by using a multi-dimensional model, the source entity is downgraded and limited according to the application permission level, the implicit excessive consumption behavior is avoided, and the bottom resource flow transfer order is reconstructed, the implicit bottleneck spread is effectively curbed, the key computing power allocation blind spot is made up, and the core business is ensured to run stably and smoothly under the impact of sudden high concurrency.

The invention discloses an environment-friendly flame-retardant high-voltage photovoltaic cable and a preparation method thereof, belongs to the technical field of cable processing, and aims to solve the technical problem that the flame retardance, insulating property, wear resistance and mechanical strength of an environment-friendly flame-retardant high-voltage photovoltaic cable in the prior art need to be further improved. The cable specifically comprises a cable core, an insulating layer and an outer sheath layer, wherein the outer sheath layer of the cable comprises the following components in parts by weight: 48-52 parts of polyurethane, 1-3 parts of adipic dihydrazide, 20-25 parts of a flame retardant, 12-15 parts of a reinforced compound and 4-6 parts of an auxiliary additive. Through the synergistic effect of the polyurethane, the flame retardant and the reinforcing compound, the flame retardant property, the insulating property, the wear resistance and the mechanical strength of the cable are improved.

This invention discloses a battery pack structure, relating to the field of battery pack heat dissipation technology. It includes a lower temperature equalization unit and an upper dual-mode heat dissipation unit. The lower temperature equalization unit includes a housing containing battery cells filled with an insulating and thermally conductive immersion liquid, ensuring complete immersion of the cells for uniform temperature distribution. The upper dual-mode heat dissipation unit includes a dual-cavity heat dissipation aluminum cover sealed to the top of the housing. Its lower side is attached to the battery cell terminals and aluminum foil via an insulating and thermally conductive elastic pad, dissipating the most concentrated heat from the top via the shortest path. The dual-cavity heat dissipation aluminum cover integrates a liquid cooling channel and an air cooling channel located above it. This invention, through a thermodynamically optimized design of "bottom full immersion temperature equalization + top directional heat conduction," completely eliminates the temperature difference between the top and bottom of the battery cells. Combined with dual-mode switching of air cooling priority and liquid cooling backup, it significantly improves heat dissipation efficiency, battery cell temperature uniformity, safety, cycle life, and reduces energy consumption.

This invention relates to the field of flame-retardant composite materials, specifically to flame-retardant composite materials based on the synergistic reinforcement of talc and graphene sheets and their applications. It addresses the problem that existing polymer materials struggle to simultaneously achieve reinforcement, flame retardancy, and lightweighting, and require large quantities of high-performance additives. The process involves first mixing talc sheets, graphene, a composite flame retardant, and a dispersant in a high-speed mixer, then cooling to room temperature to obtain a premix. A polymer matrix is ​​then added to a twin-screw extruder. The premix and other auxiliary additives are added through a side feed port, melt-blended, water-cooled, air-dried, and pelletized to obtain composite material particles. These particles are then vacuum-dried and injection-molded to obtain the flame-retardant composite material. The flame-retardant composite material possesses excellent flame-retardant and mechanical properties, exhibiting outstanding overall performance and being more suitable for industrial production.

The application discloses a composite material structure and a preparation method and application thereof, and relates to the technical field of automobiles.The composite material structure comprises a metal base plate and a fiber resin composite layer, the fiber resin composite layer is arranged on at least one side surface of the metal base plate, and the fiber resin composite layer comprises basalt fibers and a resin matrix.The application solves the technical problem that the existing automobile material is difficult to simultaneously consider mechanical bearing and fire resistance and heat insulation by combining the metal base plate and the basalt fiber composite layer.

The application discloses a kind of flame-retardant wear-resistant bus cable and its preparation method, it is related to the technical field of cable, preparation method includes: providing conductor core coated with insulating layer;The surface of aramid fiber is activated and treated, the aramid fiber after activation is immersed in flame-retardant dispersion liquid and is impregnated, then the aramid fiber after impregnation is heat treated, to obtain composite aramid fiber, composite aramid fiber is woven on the insulating layer to form composite fiber filling layer;Flame-retardant wear-resistant protective layer precursor is coated on the surface of composite fiber filling layer after melting to form flame-retardant wear-resistant protective layer.In the application, by sequentially setting insulating layer, composite fiber filling layer and flame-retardant wear-resistant protective layer on the conductor core, the insulation of cable is guaranteed and the flame-retardant wear resistance of cable is improved.

The utility model discloses a kind of single battery, battery pack and energy storage container system.The single battery includes shell, blocking membrane, electric core and heat absorber, shell has chamber, blocking membrane is located in chamber, to separate into battery cavity and fire-extinguishing cavity, blocking membrane is configured to reach preset temperature and can be melted and broken, to communicate battery cavity and fire-extinguishing cavity, electric core is located in battery cavity, heat absorber is located in fire-extinguishing cavity, for absorbing heat in chamber.The single battery, battery pack and energy storage container system of the utility model rely on integrated fire extinguishing function itself, can respond in time when electric core occurs thermal runaway, blocking speed is fast, can inhibit the spread of dangerous situation, can effectively protect single battery.

The utility model provides a fire extinguishing device based on a cable joint, which belongs to the technical field of cable accessories and comprises an outer sheath, a mounting seat, a butt joint block, a flange seat, a mounting tube, a sealing plug, a limiting plate, a fire extinguishing agent storage bottle, a container valve, a nozzle, a temperature sensing glass ball, a thermosensitive joint, a stamping fire detection tube and a pressure gauge, according to the utility model, the mounting pipe is welded on the side surface of the outer sheath, the fire extinguishing agent storage bottle is mounted in the mounting pipe through the limiting plate, and the stamping fire detection pipe on the fire extinguishing agent storage bottle is adhered to the inner wall of the outer sheath through the adhesive tape; when the stamping fire detection tube meets fire, the stamping fire detection tube is softened and exploded at the highest heated temperature position, the container valve is started through pressure reduction in the stamping fire detection tube, dry powder in the fire extinguishing agent storage bottle is released to the nozzle through the release tube to extinguish fire, the dry powder is filled in the outer sheath and rapidly extinguishes the fire when the fire breaks out from the source, the fire is effectively restrained from spreading outwards, and the fire extinguishing effect is improved. And loss caused by cable fire is reduced.

The utility model discloses a flame-retardant wear-resistant wire harness, and relates to the technical field of wire harnesses. The cable comprises an inner core, a wear-resistant layer, a basalt fiber braid layer and a flame-retardant polyolefin outer sheath which are sequentially arranged from inside to outside. According to the utility model, the inner core adopts the ceramic silicone rubber insulating layer to wrap the wire, a ceramic structure is formed at high temperature, the heat insulation and fireproof effects are remarkable, the wear-resistant layer and the basalt fiber braid layer enhance the wear resistance, tensile resistance and compression resistance, and the flame-retardant polyolefin outer sheath and the fiber layer impregnated with the flame retardant are co-extruded and molded, so that the overall flame-retardant performance is improved, and the service life of the cable is prolonged. The elastic hollow ring is filled with a flame-retardant solvent, the flame-retardant solvent is released to form a protective layer when meeting fire, flame spreading is further inhibited, the compression resistance of the wire harness is improved, the polyurethane block provides buffering and wear-resistant protection, the polyvinyl chloride anticorrosive coating on the surface of the outer sheath effectively resists chemical erosion, the flame-retardant, wear-resistant and compression-resistant performance of the wire harness is greatly improved, and the service life of the wire harness is prolonged. The power transmission stability and safety can be effectively guaranteed, and the fire risk is reduced.

The utility model relates to the technical field of rubber sealing strips, in particular to an automobile flame-retardant rubber sealing strip which comprises installation feet installed at the bottom of a sealing strip body, an airtight cavity is formed in the sealing strip body and filled with inert gas, and a buffering cavity is formed in the sealing strip body and located above the airtight cavity. And a rubber channel which is sealed in a static state is formed between the airtight cavity and the buffer cavity, rubber supporting plates are symmetrically and obliquely installed on the two sides of the airtight cavity, and an X-shaped rubber strip is installed between the two rubber supporting plates. When the sealing strip body is impacted, the sealing strip body deforms and extrudes inert gas in the airtight cavity, and the compressed inert gas breaks through the rubber channel in a static sealed state and escapes into the buffer cavity, so that the inert gas is prevented from being extruded and expanded to cause leakage, and the inert gas is prevented from leaking until a part of an automobile is smoldered to the airtight cavity. The inert gas inside is released to extinguish the smoldering part, so that fire spreading is avoided.

The invention relates to the technical field of security house intelligent supervision, and discloses a security house subleasing and lending interception method based on person and certificate verification and behavior analysis, and the method comprises the following steps: S1, collecting the biological characteristic information and identity card information of a tenant when the tenant checks in, performing real-time verification and strong binding on the biological characteristic information and the identity card information through a management platform, and setting the successfully bound biological characteristic information as the primary door opening authority of the tenant; according to the method, biological characteristics are strongly bound with people and certificates, so that masquerading and permission lending are completely eradicated; data are collected by the intelligent door lock, the management platform analyzes abnormity, automatic all-weather supervision is achieved, and cost reduction and efficiency improvement are achieved; early warning is carried out through behavior analysis, authority is dynamically adjusted, and beforehand prevention and in-event interception are achieved; multiple key links are linked to construct a closed-loop system, rent payment reminding is enhanced, the house resource utilization rate is improved, and house management refinement and compliance are comprehensively improved and guaranteed.

This invention discloses an adaptive thermal management prismatic sodium-ion battery module based on partial immersion liquid cooling, comprising a module housing, prismatic battery cells, a multi-parameter sensor array, an intelligent control unit, a graded immersion-cooled collaborative cooling system, and an adaptive structural adjustment module. The multi-parameter sensor array is responsible for collecting key parameters, including battery surface and terminal temperature, operating current, module vibration, internal humidity, and smoke concentration. The intelligent control unit performs data fusion analysis and, based on a dynamically adjusted threshold model, makes decisions and triggers corresponding actions. The graded immersion-cooled collaborative cooling system includes forced air cooling units located on both sides of the module housing and several immersion cooling tanks integrated into the battery mounting bracket. The intelligent control unit activates the graded immersion-cooled collaborative cooling system according to the thermal risk level. This invention achieves efficient, precise, and economical thermal management and safety protection.

This invention discloses a high-pressure-resistant power battery protective shell based on a multi-dimensional honeycomb structure, relating to the field of power battery protection technology. It includes an upper protective cover, with side plates fixedly connected to both ends of the upper protective cover via fixing mechanisms. The two side plates are arranged opposite each other and enclose a cell-accommodating cavity. A honeycomb pressure-resistant mechanism is provided on the side of the upper protective cover facing the cell-accommodating cavity. At least two sets of symmetrically distributed lifting mechanisms are provided on the outer sides of both side plates. The multi-dimensional gradient composite honeycomb structure achieves high pressure and impact resistance protection, while also possessing flame-retardant, heat-absorbing, and heat-dissipating properties. This solves the problems of insufficient pressure resistance, single protective function, and poor installation adaptability of traditional power battery protective shells, significantly improving the safety and stability of power battery use.

The utility model discloses an instantaneous heat energy release device for a thermal runaway fault of a battery pack. The device comprises an arc-shaped heat dissipation main body matched with the side surface of a cylindrical battery cell, an upper cover and a locking device, a plurality of evaporation holes are formed in the arc-shaped heat dissipation body and filled with liquid heat dissipation media. In a normal state, the locking device fixes the upper cover and the arc-shaped heat dissipation main body, so that the upper cover seals the evaporation holes; and when the temperature of the battery cell rises to a certain temperature, the upper cover is instantly separated from the arc-shaped heat dissipation main body, and the liquid medium rapidly evaporates to absorb heat, so that instant emergency heat dissipation is realized. The arc-shaped structure adapts to the side surface of the battery cell, is convenient to install, does not damage the surface of the battery cell, provides a certain thermal expansion space for the battery, and can be widely applied to thermal safety management of a power battery pack and an energy storage system in combination with an evaporation endothermic reaction effect.

The utility model discloses a battery pack fire extinguishing structure and a vehicle. The battery pack fire extinguishing structure comprises a shell, a liquid guide pipeline and an ejection assembly, and a containing cavity is defined by the shell; the liquid guide pipeline is provided with a first end for the fire-fighting liquid to flow in and a second end for the fire-fighting liquid to flow out, the liquid guide pipeline has a compressed state and an unfolded state, the liquid guide pipeline is located in the containing cavity when the liquid guide pipeline is in the compressed state, and the first end extends out of the containing cavity when the liquid guide pipeline is in the unfolded state; the ejection assembly comprises a limiting piece and a driving piece, the limiting piece is configured to act on the liquid guide pipeline to keep the liquid guide pipeline in the compressed state, and the driving piece is configured to drive the liquid guide pipeline to be switched from the compressed state to the unfolded state after the limiting piece releases limitation. And by arranging the battery pack fire extinguishing structure, the safety distance of fire fighting is guaranteed, firefighters are prevented from conducting pipeline butt joint operation in the high-temperature dense smoke environment, the pipeline butt joint difficulty is lowered, and high safety is achieved.

The invention discloses soft non-isocyanate polyurethane foam with excellent water resistance and flame retardance and a preparation method of the soft non-isocyanate polyurethane foam. According to the foam, a cyclic carbonate-amine reaction route based on carbon dioxide resource utilization is adopted, use of isocyanate in traditional polyurethane synthesis is fundamentally avoided, and the problems that raw materials are high in toxicity, difficult to store and transport and the like are solved. By introducing an epoxy compound containing a hydrophobic flame-retardant group in the structure and a diamine chain segment, the water resistance and the self-extinguishing characteristic of the material are remarkably improved while the soft and comfortable touch feeling is ensured. The preparation process is mild in condition and environment-friendly, and the obtained product has comfort and durability and can be widely applied to the fields of furniture, mattresses, automotive interiors and the like with high requirements on long-term supporting performance and safety performance.

This utility model discloses a port fire-fighting auxiliary device, relating to the field of fire protection technology. It includes a U-shaped frame, a pair of casters fixedly connected to the bottom of the U-shaped frame, and two straight cylinders fixedly connected between the U-shaped frame. An S-shaped chain steel pipe extends into the interior of the two straight cylinders, and a set of nozzles is embedded on the outer surface of the S-shaped chain steel pipe. This utility model has a reasonable design structure. It can spray water from inside the S-shaped chain steel pipe to the outside through the nozzles, suppressing the spread of fire on burning cargo. Simultaneously, by pushing the handle upwards, a metal ring slides on the outer surface of the S-shaped chain steel pipe, causing a horizontal plate to move the straight rod and top rod upwards, extending the first flame-retardant cloth to the upper part of the straight cylinders. The device better utilizes the port's water source to suppress the fire source, increasing the coverage area for fire suppression and thus enhancing the device's effect on suppressing the spread of fire.

The utility model relates to the technical field of control cabinets, in particular to a fire-fighting electrical control cabinet which comprises a control cabinet body, an exhaust fan, an exhaust pipe, a placement frame, a fire spreading prevention assembly and a fire extinguishing assembly, the input end of the exhaust fan is tightly attached to the inner surface of the control cabinet body, and the exhaust pipe is installed on the outer side of the output end of the exhaust fan; the placing frame is fixedly connected to the outer side of the bottom of the control cabinet body, the fire spreading prevention assembly is installed on the inner side of the control cabinet body, and the fire extinguishing assembly is movably connected to one side of the control cabinet body. According to the fire-fighting electrical control cabinet, when the temperature in the cabinet rises abnormally, the temperature sensor triggers the electric telescopic rod, the cabinet door is rapidly closed through the pushing rod, the sliding block and the connecting rod mechanism, oxygen entering is reduced, fire spreading is restrained, manual intervention delay is avoided, and rapid response is achieved; in addition, through the direct connecting pipe, the PVC telescopic pipe and the hollow support, carbon dioxide gas is conveyed to different heights in the cabinet, and full-coverage fire extinguishing is achieved.

The utility model discloses a new energy automobile battery hollow fiber fire extinguishing device, and relates to the technical field of new energy automobile fire fighting equipment, the new energy automobile battery hollow fiber fire extinguishing device comprises a shell assembly, an installation cavity is arranged in the shell assembly, and the shell assembly is provided with an air inlet, an air outlet and a fire extinguishing agent output interface which are communicated with the installation cavity; the air inlet compression assembly is arranged in the mounting cavity, one end of the air inlet compression assembly is connected with the air inlet, and the air inlet compression assembly is used for sucking and filtering external air and compressing the air; the nitrogen-oxygen separation assembly is arranged in the mounting cavity; wherein the nitrogen-oxygen separation assembly comprises a mounting shell and a nitrogen-oxygen separation hollow fiber membrane, and the problems that an existing nitrogen fire extinguishing device is large in occupied space, discontinuous in gas supply and slow in response are solved.

This invention belongs to the field of polymer composite material preparation technology, and particularly relates to a crack-resistant and flame-retardant material for cables and its preparation process, including the following steps: dissolving PVP and ammonium citrate in an ethanol solution, adding Mg / Al-LDH and hydrophilic modified expanded graphite for dispersion, heating and adding aluminum isopropoxide solution for reaction, washing and dispersing in phytic acid solution, heating and reaction, washing and drying to obtain flame-retardant microparticles; mixing EVA, EVA-g-MAH, flame-retardant microparticles, antioxidants and lubricants and extruding them in an extruder, cooling and pelletizing the extrudate to obtain the crack-resistant and flame-retardant material for cables. This invention obtains the material by blending flame-retardant microparticles with EVA and other materials and then granulating them. The flame-retardant microparticles can meet the flame-retardant requirements of the sheath made of the material with a relatively small amount added, improving the continuity of the EVA matrix and preventing cracking of the sheath under frequent bending conditions.