37results about How to "Will not ignite" patented technology

The invention provides an inert gas-protected thermoplastic material heating, melting, dripping and combusting test device. The inert gas-protected thermoplastic material heating, melting, dripping and combusting test device comprises a metal container (1) with a small circular hole at the bottom, wherein the metal container (1) is put inside an electric heating furnace (2); a small circular hole is also formed at the bottom of the electric heating furnace (2); and central axes of both the small circular hole of the metal container (1) and the small circular hole of the electric heating furnace (2) are aligned with each other in the vertical direction. In the combusting process, polymers, particularly a thermoplastic material, easily drip combustible molten liquid to form flowing fire; by heating such polymers, controllable melting dripping mass rates can be achieved; and through nitrogen gas protection in the heating furnace, in the heating process, the polymers can not be combusted, so that flowing combustion behaviors of the various polymers under the conditions of different melting dripping mass rates can be quantitatively studied.

The invention belongs to the technical field of metal matrix surface modifying, and particularly relates to a method for preparing a super-hydrophobic zinc alloy surface through infrared lasers. The method comprises the following steps that (1) a zinc alloy surface is washed and dried, and a pretreated zinc alloy is obtained; (2) a microstructure is etched on the surface of the pretreated zinc alloy through an infrared laser marking machine, and a microstructure zinc alloy is obtained; (3) the microstructure zinc alloy is washed and dried, and a clean microstructure zinc alloy is obtained; and(4) the clean microstructure zinc alloy is immersed in a stearic acid absolute ethyl alcohol solution to be subjected to constant-temperature modification and then is washed and dried, and the super-hydrophobic zinc alloy surface is obtained. According to the method, the defect that the zinc alloy is flammable is overcome, the zinc alloy surface is not ignited in the process for preparing the microstructure through the lasers, and the quality and stability of the prepared surface microstructure are good.

The invention discloses a nano silicon dioxide and intumescent flame retardant synergistic flame-resistance polypropylene / ethylene propylene diene monomer rubber composite material and a preparation method thereof. In parts by weight, a formula of the composite material consists of: 1 to 5 parts of nano silicon dioxide, 20 to 30 parts of intumescent flame retardant, 0.1 to 1.0 part of silane coupling agent, 50 to 70 parts of polypropylene, 5 to 15 parts of ethylene propylene diene monomer rubber, and 0.1 to 0.2 part of oxidized polyethlene wax. In the preparing process, the nano silicon dioxide and the intumescent flame retardant are surface-modified by the silane coupling agent. The surface-modified synergistic flame retardant is mixed with polypropylene / ethylene propylene diene monomer rubber and the like, and mixing and granulation are carried out by utilizing a three-screw extruder to prepare the nano silicon dioxide and intumescent flame retardant synergistic flame-resistance polypropylene / ethylene propylene diene monomer rubber composite material. The nano silicon dioxide provided by the invention not only can obviously improve flame retardant efficiency of the intumescent flame retardant for polypropylene / ethylene propylene diene monomer rubber alloy, but also greatly promotes mechanical performance of the intumescent flame retardant composite material.

The invention discloses a safe igniting device applied to an electronic igniting non-electric welding rod. The device comprises an external structure and an internal circuit structure, wherein the external structure comprises a rear seat, a battery housing, an intermediate switch part and a locking part which are sequentially mounted in a mutual fitting manner; the locking part is mounted in match with a medicine barrel base and used for locking or releasing the medicine barrel base; an intermediate connecting part is arranged in the locking part in a fitting manner and is connected to the medicine barrel base; the internal circuit structure comprises a tail safety switch, a battery, an intermediate exciting switching device, an electrifying driving plate and a metal inserting part which are sequentially connected through circuits. The device has the beneficial effects of being convenient to dismount and mount, stable, reliable, and safe to use and store.

The invention discloses a primer assembly device and method. The primer assembly device comprises a support device, a first prop device, a push device and a second prop device, wherein the support device is configured to support a cartridge case from one end of the cartridge case and is provided with a first through hole, and the first through hole is in communication with a primer chamber of thecartridge case; the first prop device is configured to prop against the cartridge case from the other end of the cartridge case and clamp the cartridge case in cooperation with the support device; thepush device is configured to push a primer into the first through hole or opposite to the first through hole; the second prop device is configured to push the primer from the first through hole intothe primer chamber and install the primer in the primer chamber. In the primer assembly device disclosed by the invention, as being conveyed along two different routes, primers can be prevented from being too close in assembly, so that even if a primer which is assembling explodes, other primers are not ignited, and the use is safe and convenient.

The invention relates to a rotary electrostatic spinning device for preparing nano fibers. The device comprises a high-voltage power supply, a polarization electrode and a receiving counter electrode which are connected to positive and negative electrodes of the high-voltage power supply, a solution tank, a spinning solution contained in the solution tank, and a rotary generator partially placed in the spinning solution, wherein the rotary generator is a dielectric material with dielectric constant not less than 10. According to the rotary electrostatic spinning device for preparing the nano fibers, the dielectric material with high dielectric constant is used, the corona discharge phenomenon can be reduced when high electric field the same as that of a conductor material is kept, and the spinning solution can not be ignited; and the rotary electrostatic spinning device can be applied to various electrostatic spinning operations.

The invention discloses a safe igniting device applied to an electronic igniting non-electric welding rod. The device comprises an external structure and an internal circuit structure, wherein the external structure comprises a rear seat, a battery housing, an intermediate switch part and a locking part which are sequentially mounted in a mutual fitting manner; the locking part is mounted in match with a medicine barrel base and used for locking or releasing the medicine barrel base; an intermediate connecting part is arranged in the locking part in a fitting manner and is connected to the medicine barrel base; the internal circuit structure comprises a tail safety switch, a battery, an intermediate exciting switching device, an electrifying driving plate and a metal inserting part which are sequentially connected through circuits. The device has the beneficial effects of being convenient to dismount and mount, stable, reliable, and safe to use and store.

The invention discloses low-toxicity flame-retardant normal-temperature solvent marked line paint, which is prepared from the following raw materials in parts by weight: 190 to 275 parts of solid resin, 25 to 150 parts of pigments, 225 to 500 parts of filling materials, 27.5 to 39 parts of auxiliary agents, 210 to 425 parts of dimethyl carbonate and / or aromatic hydrocarbon, 10 to 20 parts of acetone, 10 to 20 parts of butyl acetate, 100 to 250 parts of chlorohydrocarbon and 16 to 27 parts of low-level saturated monobasic alcohol. The low-toxicity flame-retardant normal-temperature solvent marked line paint provided by the invention has the advantages that the recipe of the paint is scientific and reasonable; all ingredients are matched in a synergistic way; the excellent performance of a product is improved; the solvent selection toxicity is greatly reduced than that in the prior art; the marked line paint is safer and achieves a better environment-friendly effect. The marked line paint has the advantages that the flammable and explosive features of the existing paint are changed into combustible performance; good flame-retardant effects are achieved; the production process solves the problem of flammable and explosive risk of the normal-temperature solvent marked line paint; the harm of toxic solvents is reduced; the life safety of protection, transportation and construction personnel and relevant personnel in contact with products can be effectively protected.

The invention discloses a sheet material environment protection japanning technology free of formaldehyde. The sheet material environment protection japanning technology free of the formaldehyde includes a japanning step, a low temperature leveling step, an instant high temperature step, a cooling step and a low temperature keeping step. The sheet material environment protection japanning technology free of the formaldehyde enables sheet materials to rapidly pass through an instant high temperature heating area, not only can solidify and dry oil paint, but also can not damage the sheet materials, can not ignite the oil paint, can rapidly volatilize formaldehyde, ammonia, benzene and volatile harmful matter in the oil paint, enables no formaldehyde, no ammonia, no benzene and no volatile harmful matter to remain in the sheet materials and the oil paint, rapidly removes the formaldehyde, the ammonia, the benzene and the volatile harmful matter, which remain in the sheet materials, and saves energy and protects environment.

The invention discloses a coal mine hard roof grouting fracturing method and system. Chemical expansion slurry is injected into roof holes through stirring-grouting equipment and a grouting hole-sealing device, sealing film bags are mounted in the holes, and the effect that during grouting, the slurry does not leak towards peripheral fractures of the holes is achieved. Through the volume expansionreaction principle of the slurry, a designed roadway roof is subjected to blastproof drilling fracturing, and the effect of destroying the integrity of the hard roof is achieved. The problems of coalmine hard roof suspension, the tail mining section roof pressure and hard coal body caving can be solved. The coal mine hard roof grouting fracturing method and system have the characteristics of small downhole operation engineering amount, low labor intensity, good fracturing effect and the like.

The invention discloses an environment-friendly board painting device capable of removing formaldehyde, wherein an instant high-temperature heating device is provided with a high-temperature heating mechanism and a high-speed conveyer belt; the high-temperature heating mechanism is provided with an instant heating area which is used for carrying out instant high-temperature heating on the surface of a board in a scanning way, has the temperature of 450-800 DEG C and is long and narrow in shape. The board rapidly passes through the instant heating area, so that oil paint is rapidly cured and dried, the board is not damaged, and the oil paint is not ignited; after the environment-friendly board painting device is used, the formaldehyde, ammonia, benzene and volatile harmful substances in the oil paint are rapidly volatilized, and the formaldehyde, the ammonia, the benzene and the volatile harmful substances are not left in the board and the oil paint. The ozone generated by a high-focus ultraviolet lamp tube has chemical reactions with harmful substances such as formaldehyde, ammonia and benzene in the high temperature environment, and the reaction products are carbon dioxide, oxygen and water, so that the formaldehyde, the ammonia and the benzene are decomposed, and the harmful substances such as the formaldehyde, the ammonia and the benzene are not discharged; therefore, the board painting device is energy-saving and environmentally friendly, and the production efficiency is greatly increased.

The invention discloses a multi-optical fiber channel laser infrared gas sensor comprising a circuit and man-machine exchange module, at least one semiconductor thermoelectric refrigerator, a laser, at least one infrared detector and an optical fiber probe, wherein the circuit and man-machine exchange module is used for power supply management, system control, and the phase-locking amplification, the collection, the storage, the analysis and the reading of signals as well as man-machine interaction; the semiconductor thermoelectric refrigerator is connected with the circuit and man-machine exchange module and is used for realizing temperature control; the laser is fixed on the semiconductor thermoelectric refrigerator, is connected with the circuit and man-machine exchange module, and is used for transmitting infrared laser; the infrared detector is fixed on the semiconductor thermoelectric refrigerator, is connected with the circuit and man-machine exchange module, and is used for receiving infrared laser; and the optical fiber probe is connected with the laser and the infrared detector through an optical fiber and is used for detecting a plurality of gas points to be detected. The invention can detect gas in the distance or corners with higher safety and simultaneously detect a plurality of gas measuring points, improves the integration, and lowers the cost.

The invention relates to an oiling device, in particular to an electrified oiling device for a distribution transformer. The electrified oiling device can operate in an electrified mode and comprises a first support, a second support and a through hole cone, wherein the through hole cone can be placed on an oil injecting opening in the transformer, and a hollow oil pipe is arranged on the through hole cone. The lower end of the hollow oil pipe is connected with a floating ball, an oil bag is arranged on the first support and connected with a wireless electric oil valve, the wireless electric oil valve is connected with the hollow oil pipe through an insulated soft oil pipe, and a wireless remote control transmission camera capable of shooting the oil-injection condition of the transformer is arranged on the second support. Electrified oiling of the distribution transformer can be achieved, the operation and maintenance level of the transformer is greatly increased, electricity-selling benefits are increased, the oil deficiency condition of the transformer is treated in time, and safe and stable operation of a whole power distribution net is guaranteed.

The invention relates to a method for achieving maximum output power of an intrinsic safety associated apparatus. When the intrinsic safety associated apparatus runs normally, output is carried out through a current-limiting resistor, when the voltage of the current-limiting resistor exceeds a preset value, a load is shown to be in normal connection, a quick shutdown circuit is closed, a major loop of the intrinsic safety associated apparatus does not carry out current limitation through the current-limiting resistor, power supply is carried out in a maximum output power mode, when a voltage change rate detection circuit detects that a voltage change signal of a sampling resistor reaches a preset threshold value, namely a circuit is in abnormal operation, the quick shutdown circuit is opened, and the current-limiting resistor can be used for current limitation of the circuit again. According to the design, the intrinsic safety associated apparatus can provide high-power power source output, when a load fault happens, the intrinsic safety associated apparatus can carry out rapid detection and can rapidly shut down a loop power source, ensure the fact that the load fault on site cannot ignite an explosive mixture, and achieve the self-recovery function of a protective circuit after the load fault is removed.

The invention discloses a pedal electric heating fire box using heating wires, comprising a box body (1), wherein the peripheral wall of the box body (1) is closed, the lower end of the box body (1) is provided with a bottom plate, the upper end of the box body (1) is open, the bottom plate is provided with bottom plate air vents (3), the box body (1) is internally provided with a foot pedal (9) made of a good heat conductor, the foot pedal (9) is provided with foot pedal air vents (10), a heat conducting plate (2) is installed below the foot pedal (9), the heat conducting plate (2) and the foot pedal (9) are in a mutual insulating structure form, heating elements are installed on a lower side surface of the heat conducting plate (2) in an appressed way and respectively comprise the heating wire (8) and an insulating layer (7) coated at the outer layer of the heating wire (8), the maximum electric power of the heating element per 100 millimeters is 15W under the conditions of rated voltage and rated current, a temperature controller and a fuse protector are installed on the heat conducting plate (2), and a temperature controller is installed on the foot pedal (9). The pedal electric heating fire box using the heating wires has the advantages of safety in use, comfortableness, low manufacturing cost and energy saving.

The invention discloses a fuse chamber interior ignition mechanism adopting a detonator and a space explosion suppression principle. The mechanism comprises a body, the needling detonator, a detonator base, pre-pressing springs and a fire transfer tube. The fire transfer tube comprises a fire transfer tube shell, fire transfer powder and a cover plate. An upward firing pin is arranged in the center of the top surface of the fire transfer tube shell. A sensitive explosion component for ignition is the needling detonator, the needling detonator is located on the detonator base and is a relative moving part, the firing pin located on the upper end face of the fire transfer tube shell is a fixed part, a pressure relief space is formed between the body and the detonator base, the parallel structure of the two pre-pressing springs can be adopted to improve the reliability, and fire transfer powder is insensitive fire transfer powder boron / potassium nitrate. In an assembly state, the needling detonator is far away from the fire transfer powder, the fire transfer powder is placed into the fire transfer tube shell to be sealed, and therefore the fire transfer powder cannot be ignited even though the needling detonator is accidentally ignited, and the needling detonator can be used for ignition when a gunpowder time fuse or a self-destruction gunpowder tray is launched. The fuse chamber interior ignition mechanism has the advantages of being good in safety, compact in size, simple in structure and low in price.

The invention discloses a lithium battery non-conductive charging device capable of preventing fire, which comprises a box body with a box cover and an electric control system, wherein the upper part of the box body is a battery compartment, and the lower part of the box body is an instrument compartment; an aerosol vehicle-mounted fire extinguishing device is mounted in the battery compartment; the electric control system comprises a current sampler, a current lead, a microprocessor, an alarm and a charging power supply; and the microprocessor is connected with the charging power supply, the alarm and the current sampler, and when the charging is finished or the current signal is abnormal, the microprocessor sends an instruction to control the alarm to send an alarm signal. The innovation point of the invention is that the source and range of battery fire can be controlled in the battery compartment, and the aerosol vehicle-mounted fire extinguishing device is used for extinguishing fire, so that the possibility of fire caused by battery combustion is thoroughly prevented. The device adopts a sealed charging space, oxygen is isolated firstly, and combustion is avoided at high temperature; and high-temperature substances of the second injection are limited in a tank body, so that external inflammable substances cannot be ignited.

The invention discloses an environment-friendly board painting device capable of removing formaldehyde, wherein an instant high-temperature heating device is provided with a high-temperature heating mechanism and a high-speed conveyer belt; the high-temperature heating mechanism is provided with an instant heating area which is used for carrying out instant high-temperature heating on the surface of a board in a scanning way, has the temperature of 450-800 DEG C and is long and narrow in shape. The board rapidly passes through the instant heating area, so that oil paint is rapidly cured and dried, the board is not damaged, and the oil paint is not ignited; after the environment-friendly board painting device is used, the formaldehyde, ammonia, benzene and volatile harmful substances in the oil paint are rapidly volatilized, and the formaldehyde, the ammonia, the benzene and the volatile harmful substances are not left in the board and the oil paint. The ozone generated by a high-focus ultraviolet lamp tube has chemical reactions with harmful substances such as formaldehyde, ammonia and benzene in the high temperature environment, and the reaction products are carbon dioxide, oxygen and water, so that the formaldehyde, the ammonia and the benzene are decomposed, and the harmful substances such as the formaldehyde, the ammonia and the benzene are not discharged; therefore, the board painting device is energy-saving and environmentally friendly, and the production efficiency is greatly increased.

An integrated device for sealing and scraping wax for the safety and environmental protection of floating roof tanks, comprising a scraper and a sealing film, wherein the scraper is installed on the floating plate of the floating roof tank (the floating plate floats on the liquid surface of the oil body in the floating roof tank) ), the other end of the scraper extends below the liquid level of the oil body, and a bending angle is set on the scraper. The first sealing film is a whole film structure, and the first sealing film surrounds the outer side of the floating plate and is laid on the inner surface of the scraper. Because the scraper is arranged in the present invention, the bending angle structure of the scraper has the function of scraping wax and sealing the oil body. At the same time, the scraper and the first sealing film are arranged to isolate the contact between the oil body and the outside world. Volatile into the air to form pollution, on the other hand, it can also greatly reduce the loss of oil due to volatilization. When lightning strikes, there will be no sparking phenomenon due to the formation of potential difference, and even if there is sparking phenomenon such as lightning, the fuel will not be ignited.

The invention discloses a heating system with a temperature difference driving air inlet device. The temperature difference driving air inlet device comprises a temperature difference driving system and a fan driven by the system, wherein air or premixed gas required by combustion is driven by the fan to enter a combustion area of the heating system, the high-temperature end of the temperature difference driving system is located in the combustion area, and the low-temperature end is located in an air inlet or an air inlet channel; the combustion area can be partially or completely closed, even premixed combustion can be carried out, heat in high-temperature flue gas exhausted by the combustion area can be recycled by the air flowing in the air inlet channel, the premixed gas and / or fuel, the heat returns to the combustion area again to be utilized, and the heat efficiency of the heating system can be obviously improved; the temperature difference driving system is a Stirling system or a system composed of a temperature difference power generation sheet and a motor. The heating system with the temperature difference driving air inlet device does not need to be driven by external electric power, is high in heat efficiency, low in fuel consumption and free of exposed open fire, not only the heating temperature can be improved, but also can the temperature difference and oil smoke of a heated area and the like be reduced, and obvious advantages are achieved.

The invention provides a composite chemical heat conducting medium, which comprises a basic liquid and a buffer agent. The buffer agent accounts for 1 to 8% of the total weight of the composite chemical heat conducting medium and comprises following components in parts by weight: 55 to 85 parts of distilled water, 4 to 10 parts of potassium dihydrogen phosphate, 4 to 10 parts of potassium sulfate,1 to 6 parts of sodium chloride, 3 to 9 parts of glycol, and 3 to 10 parts of glycerol. The preparation method comprises following steps: adding potassium dihydrogen phosphate, potassium sulfate, andsodium chloride into distilled water, mixing to obtain an inorganic water solution; mixing the inorganic water solution with glycol and glycerol, transferring the mixed solution to a vacuum glove box, carrying out nitrogen replacement until all air is discharged, controlling a temperature of 55 to 75 DEG C, heating, adding a corrosion inhibitor, heating, and stirring until pH value reaches 7.5-8.5. The provided heat conducting medium has an excellent heat conducting performance, a good high temperature boiling-resistant performance, and high safety, is suitable for various high temperature / low temperature work environments, also has an excellent corrosion inhibition performance, and can be used for a long term stably.

The present invention relates to the technical field of control devices, and in particular to an explosion-proof loop controller, comprising a assembly housing, an upper cover body and a control module, the assembly housing has an opening, the upper cover body is disposed at the opening of the assembly housing, the control module includes a first PCB board, a control module, and a wiring mechanism, the first PCB board is disposed in the assembly housing, the control module is disposed on the PCB board, the wiring mechanism is disposed at the opening of the assembly housing and electrically connected to the PCB board, the wiring mechanism is used for electrically connecting an external cable and the PCB board, and inside of the wiring mechanism and the assembly housing is jointly enclosed to form with a encapsulation area. Electronic components such as the first PCB board and the control module are enclosed in an explosion-proof sealant, so that even if the electronic components such asthe first PCB board and the control module generate arcs and sparks during operation, flammable gas around the explosion-proof loop controller will not be ignited, significantly improving service safety of the explosion-proof loop controllers.

The invention provides an electromagnetic pull pin type rapid opening valve. The electromagnetic pull pin type rapid opening valve mainly comprises a membrane base, a membrane, an electromagnetic valve, a piston barrel, a punch die piston and an energy accumulation spring. The membrane of the electromagnetic pull pin type rapid opening valve is placed in a positioning groove of the membrane base, the punch die piston and the energy accumulation spring are arranged in the piston barrel, and the energy accumulation spring is in threaded connection with the piston barrel. The membrane base and the piston barrel are in bolt connection. The electromagnetic valve and the piston barrel are in threaded connection. When a detector detects flames, a controller sends out electric signals, the electromagnetic valve receives the electric signals and then starts to act, a pin of the punch die piston is pulled out, the punch die piston breaks through the membrane through the push force of the energy accumulation spring, fire extinguishing media are sprayed through the inner gas pressure of a gas cylinder, and the combustion flames are put out. The adopted electromagnetic valve belongs to anti-explosion type electromagnetic valves, extremely high safety is achieved, the sealing membrane can be broken through within 20 milliseconds, rapid spraying of the explosion suppressor fire extinguishing media is effectively achieved, and the electromagnetic pull pin type rapid opening valve has the beneficial effects that safety is high, the spraying performance is good, and the response speed is high.

The invention relates to a rotary electrostatic spinning device for preparing nano fibers. The device comprises a high-voltage power supply, a polarization electrode and a receiving counter electrode which are connected to positive and negative electrodes of the high-voltage power supply, a solution tank, a spinning solution contained in the solution tank, and a rotary generator partially placed in the spinning solution, wherein the rotary generator is a dielectric material with dielectric constant not less than 10. According to the rotary electrostatic spinning device for preparing the nano fibers, the dielectric material with high dielectric constant is used, the corona discharge phenomenon can be reduced when high electric field the same as that of a conductor material is kept, and the spinning solution can not be ignited; and the rotary electrostatic spinning device can be applied to various electrostatic spinning operations.

The invention discloses a fireplace with a wall painting, which comprises a fireplace and a wall painting, wherein the fireplace is arranged in a frame body for isolating flame, and the frame body is connected with the wall painting. Because the fireplace in the fireplace with the wall painting provided is arranged in the frame body for isolating from flame, the flame of the fireplace cannot ignite surrounding objects, and the color and the like of the wall painting can not be damaged due to high temperature. By applying the structure, the fireplace with the wall painting not only can be used for heating but also can be used for decorating the environment, and the structure is extremely novel and emphasizes the atmosphere better.

The invention provides a treatment method for fluorine-containing waste gas and belongs to the technical field of environmental protection. In the treatment method, an absorption packed washing tower for an alkaline process and an electric demister are combined for use. Part of the gas between electrodes is ionized into positive and negative ions by a corona polar line in the electric demister, and dust and mist dispersing in the gas collide with the electronegative ions to bear negative electricity; and according to the principle that like charges repel, but opposite charges attract, the positive ions move onto the corona polar line, while electrons and the negative ions move to a receiving electrode, so that dust and mist particles bearing the negative electricity also move to the glass fiber reinforced plastic receiving electrode. Compared with the prior art, the treatment method can ensure that the success rate of fluoride is above 96%, and the fluoride can stably reach the discharge standard.

The invention relates to an anti-explosive integrated holder which comprises a control module, a power management module, a transverse transmission mechanism, a pitching transmission mechanism, a pitching barrel body and a power supply and the like, wherein the pitching barrel body is connected with the pitching transmission mechanism; the pitching transmission mechanism and the transverse transmission mechanism are both connected with the control module; and a power supply supplies power to each module through the power management module. According to the anti-explosive integrated holder, the control module controls the power management module so as to adjust movements of the transverse transmission mechanism and the pitching transmission mechanism.

The invention discloses a marine refrigerator body with a welded aluminum honeycomb totally enclosed concave tray. The marine refrigerator body comprises a frame, galvanized steel plates wrapped outside the frame, a thermal insulation layer filled between different parts of the frame, a welded aluminum honeycomb totally enclosed concave tray arranged at the bottom of the inner side of the frame, wall plates arranged around the inner side of the frame, and a ceiling arranged at the top of the inner side of the frame. The welded aluminum honeycomb totally enclosed concave tray is formed by welding welded aluminum honeycomb plates after the welded aluminum honeycomb plates are mounted at the bottom of the inner side of the frame; the welded aluminum honeycomb plates comprise a flat-plate welded aluminum honeycomb plate and a straight-angle welded aluminum honeycomb plate, the flat-plate welded aluminum honeycomb plate forms a planar part of the welded aluminum honeycomb totally enclosed concave tray, and the straight-angle welded aluminum honeycomb plate forms ambient corner parts of the welded aluminum honeycomb totally enclosed concave tray; and stainless steel countersunk screws for the welded aluminum honeycomb plates are mounted at the bottom of the inner side of the frame after penetrating through an aluminum alloy embedded block, and joints of rust-proof patterned aluminumplates on the surfaces of the welded aluminum honeycomb plates after splicing are welded fully enclosed by argon arc welding. The welded aluminum honeycomb plate is formed by brazing a rust-proof patterned aluminum plate, an aluminum honeycomb core, a rust-proof aluminum plate and an aluminum alloy embedded block. The marine refrigerator body with a welded aluminum honeycomb totally enclosed concave tray, provided by the invention, is mainly applied in the field of marine refrigerators for food preservation on ships and submarines. A totally enclosed concave tray is formed at the bottom of themarine refrigerator, so that the marine refrigerator has the advantages of no water leakage, light weight, good heat preservation performance, high strength and rigidity, and good fire prevention performance.

The invention provides an inert gas-protected thermoplastic material heating, melting, dripping and combusting test device. The inert gas-protected thermoplastic material heating, melting, dripping and combusting test device comprises a metal container (1) with a small circular hole at the bottom, wherein the metal container (1) is put inside an electric heating furnace (2); a small circular hole is also formed at the bottom of the electric heating furnace (2); and central axes of both the small circular hole of the metal container (1) and the small circular hole of the electric heating furnace (2) are aligned with each other in the vertical direction. In the combusting process, polymers, particularly a thermoplastic material, easily drip combustible molten liquid to form flowing fire; by heating such polymers, controllable melting dripping mass rates can be achieved; and through nitrogen gas protection in the heating furnace, in the heating process, the polymers can not be combusted, so that flowing combustion behaviors of the various polymers under the conditions of different melting dripping mass rates can be quantitatively studied.