112results about How to "Uniform divergence" patented technology

The invention discloses an LED and a dispensing method of LED fluorescent powder. The dispensing method comprises the steps of: A, providing a bearing seat and an LED blue light chip, and fixing the LED blue light chip on the bearing seat through primer; B, respectively connecting the positive and the negative electrodes of the LED blue light chip with the positive and the negative electrodes of the bearing seat by using wires; C, mixing the fluorescent powder, nano powder and silicon gel according to a preset proportion to form fluorescent gel, and uniformly stirring; D, carrying out vacuumizing defoaming treatment on the fluorescent gel to eliminate remained gases in the fluorescent gel formed through mixing; E, coating the fluorescent gel on a dispensing position on the surface of the LED blue light chip at a dispensing height; and F, heating and curing the fluorescent gel coated on the surface of the LED blue light chip. The method has better effect on improving excitation efficiency of the fluorescent powder, uniformity of emitted light distribution and consistency of color temperature.

The invention discloses an intelligent LED illuminating lamp capable of adjusting color temperature and brightness automatically, which is used to solve the problem that the light intensity and color temperature of the conventional LED illuminating lamp cannot be adjusted, so as to lead to poor comfort level in human eyes. The Intelligent LED illuminating lamp comprises LED lamp beads and a mounting plate for mounting the LED lamp beads, and further comprises a control system, wherein the control system comprises a control chip, a light sensor and a color temperature adjustment module, the color temperature adjustment module and the light sensor are electrically connected with the control chip, and the control chip are electrically connected with the LED lamp beads. The Intelligent LED illuminating lamp can adjust the light intensity and color temperature to improve the comfort level of human eyes according to the variation of environment, can be used in different conditions, and can be greatly extended in function and application range.

The invention belongs to the technical field of diesel engine tail gas treatment system equipment, and relates to a two-blade conical surface type cyclone urea mixing device which comprises a barrel body; a cyclone pipe is fixedly arranged in an inner cavity of the barrel body; the axis of the cyclone pipe is mutually perpendicular to that of the barrel body; the two ends, in the axial direction of the barrel body, of the cyclone pipe are fixedly equipped with a first partition and a second partition separately; the first partition, the second partition and the cyclone pipe are used for dividing the barrel body into a gas inlet cavity and a gas outlet cavity; the two ends of each of the first partition and the second partition are separately arched in a circular-arc mode towards the two ends of the barrel body; one end of the cyclone pipe is in contact with the inner wall of the barrel body, and the other end of the cyclone pipe is equipped with a jetting base; a urea spray nozzle is arranged on the jetting base; a thermal-insulation layer covers the surface of the barrel body; and a notch is formed in a position, which corresponds to the jetting base, of the thermal-insulation layer. The mixing device can effectively solve the problems that in an existing SCR tail gas treatment process, a mixing path for ammonia gas and tail gas is relatively short, and tail gas treatment is affected by insufficient mixing.

The invention discloses a design and additive manufacturing method of a gradient porous structure heat dissipation device based on temperature distribution, and belongs to the technical field of heatexchange. The design and additive manufacturing method aims to overcome the defects of concentrated thermal stress and high temperature gradient of a heat exchanger designed by adopting the method, and have the advantages of compact structure, light weight, high heat exchange efficiency and the like. Firstly, a space matrix is established according to temperature distribution and mapped into the relative density of a porous structure, and the porous heat dissipation structure with continuous gradient change is obtained; then a design process of a typical radiator is given, and the design process comprises a Boltzmann fitting function algorithm and a structure design method; and finally, an additive manufacturing forming process of a high-strength and high-thermal-conductivity copper alloyis provided, and the device is integrally formed by adopting a selective laser melting process. The design method is suitable for occasions with special requirements for temperature uniformity, and high heat concentration can be effectively avoided; the gradient change porous structure also has the advantages of high specific surface area, light weight and high heat dissipation efficiency.

The invention discloses a light emitting diode (LED) and an encapsulating method thereof. The method comprises the following steps: providing a stacker with a groove and an LED blue light wafer, depositing or evaporating metal or alloy on the bottom of the blue light wafer, fixing the LED blue light wafer with metal or alloy deposited or evaporated on the bottom in the groove by solid crystal adhesive, and opening a rubber overflow groove leading the groove to be communicated with the outside on the surface of the stacker; electrically connecting negative and positive electrodes of the LED blue light wafer with negative and positive electrodes of the stacker respectively by lead wires; and encapsulating and molding the surface of the LED blue light wafer in the groove by external seal adhesive. By opening the rubber overflow groove on the surface of the stacker, residual external seal adhesive can flow to the outside of the groove through the rubber overflow groove when the external seal adhesive is used for encapsulation, and a horizontal plane is formed in the whole groove, so the light emitted by the LED blue light wafer can be radiated uniformly through the rubber on the horizontal plane, and the light emitting uniformity of the whole LED is consistent.

The invention relates to a semiconductor refrigeration refrigerator and a manufacturing method of the semiconductor refrigeration refrigerator. The semiconductor refrigeration refrigerator comprises an outer shell, a semiconductor module and at least one heat end heat pipe which transmits the heat of the semiconductor module to the outer shell, and at least one part of an condensing segment of each heat end heat pipe is welded on the inner surface of the outer shell. The invention further provides the manufacturing method of the semiconductor refrigeration refrigerator. According to the semiconductor refrigeration refrigerator and the manufacturing method thereof, due to the fact that the at least one part of the condensing segment of each heat end heat pipe is welded on the inner surface of the outer shell, the surface of the outer shell can be fully used as a heat dissipation surface, a heat dissipation fan is not needed, and the semiconductor refrigeration refrigerator is energy-saving, environment-friendly, high in reliability, simple in structure, convenient to install and high in practicality.

The invention discloses a preparation method of a graphene oxide coated carbon microsphere composite material. The method comprises the following steps: preparing a dextrose solution as a carbon source; performing hydrothermal reaction under an acidic condition; washing the obtained product in a plurality of times; performing suction filtering; drying to obtain carbon microspheres; dissolving thecarbon microspheres in a mixed solution consisting of water and absolute ethyl alcohol; then adding a mixed solution of a silane coupling agent and the absolute ethyl alcohol; performing condensing and reflowing under a room temperature or a heating condition; washing the obtained product in a plurality of times; performing suction filtering; drying to obtain modified carbon microspheres; adding graphene oxide to DMF; then adding an activating agent; ultrasonically treating to obtain a graphene oxide solution; adding the modified carbon microspheres to the graphene oxide solution; ultrasonically processing to obtain an uniform mixed solution A; adding a catalyst to the mixed solution A; performing condensing and reflowing under a heating condition; washing the obtained product in a plurality of times; and performing suction filtering and drying to obtain the graphene oxide coated carbon microsphere composite material.

The invention discloses a multifunctional multi-layer diffusion plate, which comprises a first diffusion plate, a second diffusion plate, a third diffusion plate, diffusion grooves and diffusion titanium particles, wherein the first diffusion plate and the third diffusion plate are respectively connected with the top surface and the bottom surface of the second diffusion plate, each diffusion groove is formed in the second diffusion plate, and is of a pyramid-shaped structure, and the diffusion titanium particles are respectively arranged in the first diffusion plate and the second diffusion plate. By adopting the method, the multifunctional multi-layer diffusion plate has the advantages that by realizing the multi-layer diffusion overlapping effect, the utilization rate of light rays is improved, the emitting of the light rays is more uniform, and the glare is avoided.

The invention relates to a method for preventing hot working warpage and deformation of large titanium alloy isothermal precise thin web plate forge pieces. The method is characterized by comprising the following steps of: taking isothermal precise forge pieces out of a high-temperature forging mould, and then hanging the forge pieces on a bracket for air cooling; and before heat treatment in a furnace, flatly placing forge pieces with warpage on base plates, and putting cushion blocks between the forge pieces and base plates and firmly padding, wherein if the bottom surfaces of the forge pieces are parallel and have equal height, the heights of the cushion blocks are consistent, and if the bottom surface of the forge pieces have height falls, the heights of the cushion blocks have identical falls. By adopting the method, heat in the processes of cooling after isothermal forging and cooling after heat treatment of large complicated titanium alloy plane structures with unequal cross section areas is uniformly dispersed, and the forge piece warpage parts are pressed flatly in the heat treatment process. The process provided by the invention has the advantages of simplicity, easiness in application and low cost.

The invention discloses a cold rolling work roller used for non-ferrous metal calendaring and a preparing method of the cold rolling work roller and belongs to the field of cold rolling roller materials. The cold rolling roller comprises, by weight percent, 1.65%-1.92% of C, 0.32%-0.40% of Si, 1.25%-1.60% of Mn, 4.6%-6.5% of Cr, 1.55%-2.40% of Ni, 0.5%-1.0% of Mo, 4.30%-5.4% of W, 1.40%-1.65% of V, 0.3%-0.45% of Zr, 0.40%-0.65% of Ag, 0.20%-0.35% of Zn, smaller than or equal to 0.04% of S, smaller than or equal to 0.03% of P and the balance Fe. A preparing method of the cold rolling work roller comprises the steps that annealing treatment is conducted on a forging blank firstly, then rough turning is conducted, then semifinishing is conducted after quenching and tempering treatment, then tempering is conducted again after heat treatment, and finally the roller is obtained through finish grinding. The roller has high strength and high wear resistance, meanwhile, the roller has good heat conductivity and heat dissipation, heat distribution of the roller is even in the rolling process, local overheat is effectively avoided, the probability of metal calendaring material sticking can be lowered, the service life of the roller is prolonged, and the quality of rolled products is improved.

The invention discloses a multifunctional double-layer arc diffusion plate. The multifunctional double-layer arc diffusion plate comprises a first diffusion layer, a second diffusion layer, light guide posts, a titanium particle layer and scattering hole layers, the two adjacent scattering hole layers are combined to form a V-type structure, the light guide posts are of a hollow structure, the bottom of the first diffusion layer is of a planer structure, the top face of the first diffusion layer is of an arc structure, the top face of the second diffusion layer is connected with the bottom face of the first diffusion layer, the light guide posts are located in the first diffusion layer, and the titanium particle layer and the scattering hole layers are arranged in the second diffusion layer. By means of the mode, as light is refracted and diffused many times through various different structures, the use ratio of the light is increased, and the light is diffused more uniformly and not dazzling.

Disclosed are a concentric glowing knob structure and a loudspeaker with the knob structure. The concentric glowing knob structure comprises an upper casing, an encoder, a light source unit, a light guide ring unit and a knob. The upper casing is covered on a circuit substrate and comprises a first opening; the encoder is arranged on the circuit substrate and comprises a screw bar which is arranged outside the casing in a penetrating mode through a first opening and rotates the circuit substrate along the axis to enable the circuit substrate to generate control signals; the light source unit is fixed on the circuit substrate and comprises a plurality of luminous components; the light guide ring unit comprises an upper light guide ring and a lower light guide ring, wherein the lower light guide ring is tightly sleeved on the encoder and arranged outside the upper casing in a penetrating mode through the first opening and is provided with a second opening and at least one light channel, the screw bar is arranged outside the lower light guide ring in a penetrating mode through the second opening, the upper light guide ring is provided with a third opening, a light inlet face and a light outlet face and sleeved on the lower light guide ring through the third opening; and the knob is clamped on the screw bar and can be driven to generate control signals when the knob is rotated. By means of the concentric glowing knob structure and the loudspeaker with the knob structure, the light guide uniformity can be enhanced.

The invention provides a method for encapsulating a light-emitting diode (LED). The encapsulating method comprises the following steps: arranging an LED chip on a substrate; and ejecting an encapsulating material onto the surface of the LED chip to evenly control the thickness of an encapsulation layer. The ejection is realized through spray technology by a spray gun. The encapsulating method further comprises a step of curing the encapsulation layer. The curing step can be realized by any mode of heating, UV light radiation or electrifying and heating the LED chip. The encapsulating material comprises an ultraviolet (UV) photo-curing adhesive and can further comprise fluorescent powder and diluent.

The invention discloses a multi-sawtooth light diffusion plate. The multi-sawtooth light diffusion plate comprises a diffusion plate body, diffusion sawteeth, a double reflecting device and nano titanium particles. The double reflecting device comprises reflecting protrusions and reflecting grooves; the diffusion plate body, the diffusion sawteeth and the double reflecting device are all made of transparent materials; the diffusion sawteeth are of a structure of triangular prisms and are arranged on the top surface and the bottom surface of the diffusion plate body; the nano titanium particles are uniformly arranged inside the diffusion plate body; the reflecting protrusions and the reflecting grooves are arranged at the tops of the diffusion sawteeth. Therefore, the multi-sawtooth light diffusion plate reflects and refracts light through multiple sawteeth, thereby improving the light utilization rate and enabling light diffusion to be more uniform.

The invention discloses an explosion-proof lamp structure. The explosion-proof lamp structure comprises a front shell, a pressing ring, a transparent cover and a light source, wherein the front shell comprises a main shell, a light source mounting part and a lug boss; the light source mounting part is of a hollow circular truncated cone structure and comprises a first big head end and a first small head end; the first big head end is opened; the first small head end is closed and is opposite to the first big head end; the first big head end is connected to the inner periphery of one end of the main shell; the lug boss is formed by outwards protruding the outer periphery of the first opening end; internal threads are formed on the inner periphery of the lug boss; the light source mounting part is integrally molded with the main shell and the lug boss; the transparent cover is fixed to the front shell through the pressing ring; the transparent cover and the front shell enclose to form a light source cavity together; the light source is accommodated in the light source cavity and is arranged on the outer side surface of the light source mounting part; heat emitted from the light source is transferred to the main shell through the light source mounting part and is diffused outwards by the main shell. The explosion-proof lamp structure is relatively high in radiation effect and is relatively high in reliability.

The invention discloses a beautification lamp with a multi-angle irradiation function. The beautification lamp comprises a lamp holder base plate, wherein a rotatable turntable is arranged above the lamp holder base plate; a center connecting shaft is connected between the lamp holder base plate and the rotatable turntable; a rectangular installing groove is formed in the upper surface of the rotatable turntable; an ascending and descending rod is arranged in the installing groove; a bending connector is arranged at the side edge of the ascending and descending rod; the upper end of the ascending and descending rod is connected with a lamp disc installing seat; a lamp circular disc is arranged on the front surface of the lamp disc installing seat; the front surface of the lamp circular disc is provided with a front side installing plate; a round center hole is formed in the geometric center position of the lamp circular disc; a rotating lamp board is connected onto the front side installing plate; the rotating lamp board and the front side installing plate are connected through a connecting rotating shaft; a plurality of strip-shaped lamp bead fixing grooves are formed in the surface of the rotating lamp board; a plurality of lamp beads are arranged in the edge position of the front side installing plate; the back surface of the lamp board installing seat is connected with a lamp board driving motor. The beautification lamp solves the problem that a conventional beautification lamp has a small regulation angle and is only applicable to the use by a single person.

The invention provides an optical waveguide combiner and a head-mounted device. The optical waveguide combiner comprises an optical waveguide sheet, a first metasurface and a second metasurface, the first metasurface and the second metasurface are respectively arranged in areas at two ends of the optical waveguide sheet; the first metasurface and the second metasurface respectively comprise same rectangular columnar unit structures, and the rectangular columnar unit structures are arranged according to the phase difference and the diffraction efficiency to light and have different rotation angles; therefore, an incident first light beam is transmitted in the optical waveguide sheet after being diffracted by the first metasurface, and is uniformly emitted after being diffracted by the second metasurface, so that a second light beam incident from the second metasurface is uniformly emitted in a diopter divergence manner after being diffracted by the second metasurface. When the optical waveguide combiner is applied to head-mounted equipment, the first light beam and the second light beam are fused in front of human eyes, so that immersive experience can be enhanced, and the second light beam has diopter divergence, so that the optical waveguide combiner can have the function of myopia glasses.

The invention relates to an electrochemical dechlorination device and method for reinforced concrete. The electrochemical dechlorination device comprises an MMO electrode net sleeved at the peripheryof the side face of the concrete, a reinforcing steel bar of which one end is buried in the concrete and the other end is led out from the end face of one side of the concrete and a direct current constant current source. A negative electrode of the direct current constant current source is electrically connected with the leading-out end of the reinforcing steel bar, and a positive electrode of the direct current constant current source is electrically connected with the MMO electrode net. A connecting part of the MMO electrode net and a wire, two end faces of the concrete and the side face ofthe reinforcing steel bar exposed outside the concrete are packaged by using an epoxy resin. The side face of the concrete and the MMO electrode net are cooperatively installed in a PVC container. The PVC container is internally provided with saturated Ca(OH)2 solution. A plurality of composite probes for detecting a chloride ion concentration and a pH value in the concrete are buried in the concrete. The dechlorination device is simple in structure, high in stability, good in economy, reliable in source, and high in desalting rate, and can be repeatedly used for a long time.

The invention provides a coupler, relating to the optical communication field. The coupler comprises a first light spot zooming zone and a second light spot zooming zone; the first light spot zooming area comprises a first media and a second media packing the first media; a refractive index of the first medial is greater than a second refractive index of the second media; the first media comprises a square surface and a rectangle surface; light goes in and out of the first media through the square surface and the rectangle surface; the area of the rectangle surface is greater than that of the square surface; the second light spot zooming area is positioned on one side of the rectangle surface of the first media; the second light spot zooming area comprises hybrid medium and uniform medium, and the hybrid medium and the uniform medium are arranged by intervals; the hybrid media comprises a third media and a fourth media packing the third media; and the refractive index of the third media is greater than that of the fourth media. The coupler reduces energy loss during an optical coupling process.

The invention provides a vehicle tail gas treatment treating fluid mixing device. The vehicle tail gas treatment treating fluid mixing device is mainly characterized by comprising a first cavity, anda second cavity is formed in the side face of the first cavity; one end of the first cavity is closed, and an opening in the other end of the first cavity serves as a gas outlet; the second cavity isprovided with a gas inlet pipe and a treating fluid inlet; the second cavity is internally provided with a rotational flow pipe aligned with the treating fluid inlet; the rotational flow pipe is provided with vortex generation blades around the axis; the vortex generation blades are located on the section, close to the treating fluid inlet, of the rotational flow pipe, and the other section, deviating from the treating fluid inlet, of the rotational flow pipe is a porous section; the porous section on the rotational flow pipe partially stretches into the first cavity; and turbulent flow partition plates are arranged in the first cavity and behind the second cavity. By means of the vehicle tail gas treatment treating fluid mixing device, the ammonia mist mixing effect can be improved, and ammonia gas and tail gas are mixed more sufficiently.

The invention discloses a solar energy double-circulation decoration curtain wall which has the advantage that the decoration curtain wall less influences indoor hue . The solar energy double circulation decoration curtain wall includes a curtain wall frame, an inner layer plate and an outer layer plate connected with the inner side and the outer side of the curtain wall frame; a lower side innerair outlet is formed in the lower side of the inner layer plate and a upper side inner air outlet is formed in the upper side of the inner layer plate; an upper side outer air outlet is formed in theupper side of the outer layer plate; and the inner layer plate includes a transparent solar cell module and a transparent glass plate arranged staggerly. Sunshine passing the transparent solar cell module is in red or yellow due to the fact that the transparent solar cell module absorbs part light. But all colored light can pass the transparent glass plate so that the colored light except the redor yellow can be complemented, the integrated colored light is in light red or light yellow, and the influence on the hue indoor is reduced after the transparent solar cell module is used.

The invention provides a centrifugal separation drum machine. The centrifugal separation drum machine comprises an upper drum, a lower drum, a limiting retainer ring, a positioning ring and a drivingshaft; the internal of the upper drum is equally divided into multiple separation chambers in the radial direction; a feed pipe is arranged in the upper drum; one end of the feed pipe is connected with the top of the upper drum; a feed distribution disc is mounted at the other end of the feed pipe; the bottom of the upper drum is contacted with the lower drum through a stop port; the limiting retainer ring is mounted at the external of the upper drum; an inner ring of the positioning ring is slidingly connected with the lower drum; the positioning ring is connected with the limiting retainer ring; a slag outlet and the multiple separation chambers do not communicate through a stop port sealing surface; an inner hole of an input shaft sleeve of the lower drum is connected with the driving shaft; and a slide adjusting mechanism is mounted at the external of the input shaft sleeve of the lower drum. The centrifugal separation drum machine can guarantee maintenance of synchronous rotatingspeed of a separation medium and the drums; the medium is relatively static without generating disturbance; the separation state is the same with an experiment centrifuge; and the solid-phase slag outlet flow can be randomly adjusted.

The invention discloses a marking structure and an electronic device, wherein, the marking structure comprises a box body, a marking hole is arranged on the box body, and a light source and a light guide plate are accommodated in the box body. The light guide plate is accommodated in that box body and exposes the light of the light source at the mark hole, one side of the light guide plate is opposite to the light source, and the light guide plate is protruded toward the side surface of the light source with two protruding parts and a light condensing part. A light condensing section focuses incoming light rays of a light source on a central axis of the light guide plate, a plurality of tooth-shaped protrusions are protruded toward the surface of the light source, two protrusions are respectively located on opposite sides of the light condensing portion, and the protrusions include an incident surface and a total reflection surface, the incident surface faces the light condensing portion, and the total reflection surface faces away from the light condensing portion. The marking structure provided by the invention improves the utilization rate of light energy, improves the light intensity and uniformity of the light guide plate, improves the user experience, and further reduces the cost.

The invention belongs to the field of LED illumination, and relates to an LED lamp bead capable of displaying three colors and an LED street lamp using the lamp bead. The lamp bead comprises a support; two conductive groups, namely a first conductive group and a second conductive group, are arranged in the support in parallel at an interval; a first chip and a second chip are respectively mountedon the first conductive group and the second conductive group and are connected through a gold wire, and a first fluorescent powder layer and a second fluorescent powder layer respectively cover the first chip and the second chip; after the first conductive group is electrified, the first fluorescent powder layer cooperates with the first chip to enable the lamp bead to emit cold white light; after the second conductive group is electrified, the second fluorescent powder layer cooperates with the second chip to enable the lamp bead to emit yellow light; and when the first conductive group andthe second conductive group are electrified simultaneously, the lamp bead emits yellow-white light. The size of the three-color LED lamp bead is the same as that of a common lamp bead in the market, and the space in the lamp bead support is fully utilized; two blue light chips are distributed in parallel and correspondingly coated with the two kinds of fluorescent powder, so that the effect of emitting light sources with three color temperatures is achieved, and three purposes are achieved through one lamp.

The invention discloses a brightness blessing lamp structure, which mainly comprises an accommodating space with an opening, wherein the accommodating space is formed in a lamp holder; a sheet backlight assembly serving as a light source body is arranged in the accommodating space so as to generate uniformly scattered light rays; a transparent panel is arranged at the opening (on the front side of the light source body) of the accommodating space; three-dimensional religious patterns or characters (which can be recessed and are in layered recessed carved shapes) are arranged on the surface of one side of the transparent panel close to the accommodating space; and embossing patterns are arranged on the other side of the transparent panel. Therefore, the uniform light rays of the light source body pass through the three-dimensional religious patterns or characters, and special visual effect with three-dimensional shadows can be generated.

The invention discloses an agricultural seed cultivation device with a constant temperature function, and relates to the technical field of seed cultivation. The agricultural seed cultivation device comprises a cultivation cabinet and placement plates fixedly connected with the left and right sides of an inner cavity of the cultivation cabinet, wherein growth grooves are formed in the tops of the placement plates, an electric heating mechanism is arranged at the top of the inner cavity of the cultivation cabinet, a temperature sensor is arranged on the side surface of the inner cavity of the cultivation cabinet, the temperature sensor is electrically connected with the electric heating mechanism through an electric wire, a rectangular groove is formed in the right side of the cultivation cabinet, and a driving motor is arranged on the inner wall of the rectangular groove. Hot air generated by the electric heating mechanism can rapidly flow in the inner cavity of the cultivation cabinet, meanwhile, the hot air can be evenly diffused to all parts of the inner cavity, constant and even temperature is kept, fertilizer, seeds and soil can be rapidly sprayed, while manpower resources are saved, fertilizer can be sprayed more uniformly, and the fertilizer can be ground into high-quality fertilizer which is uniform in texture and approximate in size.

The invention provides a draught fan for truck bed of off-gas heating dumper, wherein the bottom and the lateral surface of a truck bed are designed into dual-layer structures, the bottom of the truck bed is retained with an air inlet, which can collect off gas discharged by an automobile engine, a partition plate is provided between each dual-layer structure of the truck bed for supporting, small holes are opened on each partition plate, then the inner parts of the dual-layer structures of the bed truck are communicated with each other via the small holes; a baffle with one end being opened is provided on the bottom of the dual-layer bed truck horizontally, after off gas which is high in temperature is collected into the dual-layer structure via a gas collector, the off gas is dispersed evenly via the small holes, a heat circulating system is formed in the inner part, after heat balance is reached, a natural heat insulation box is formed, the whole temperature of the truck bed is risen to a certain level, which does not freeze with materials and achieves normal working. The off gas with the temperature being lowered via circulation is discharged via a vent hole reserved on the bottom of the truck bed, and a draught fan is mounted at the vent hole, for making the air flow in the dual-layer structures flow more smoothly.