60results about How to "Avoid interpenetration" patented technology

The invention relates to sagger with coatings capable of resisting high-temperature lithium battery corrosion and a method for preparing the sagger, and belongs to the field of refractory materials. Thesagger with the coatings capable of resisting high-temperature lithium battery corrosion comprises a sagger blank, and is characterized in that a layer of glaze with the coatings capable of resisting high-temperature lithium battery corrosion is impregnated on the surface of the sagger blank, and then the sagger blank is baked in a high-temperature furnace to obtain the sagger; the glaze with the coatings capable of resisting high-temperature lithium battery corrosion comprises dry materials and solvents which are mixed with one another, and the solid content of the glaze is 30-40vol%; the dry materials comprise, by weight, 20-50% of Al2O3, 20-50% of SiO2, 15-35% of ZrO2, 10-25% of MgO and 5-16% of Li2O. Micro-powder is further added into the sagger blank, and the weight percentage of the micro-powder is 2-10%; the micro-powder comprises one of andalusite, kyanite and sillimanite or mixture of more than two of the andalusite, the kyanite and the sillimanite. The sagger has the advantage that erosion of the sagger due to lithium ion solution can be effectively prevented.

A processing technique for bamboo flooring with wood grains includes the steps: sanding the upper surface of the bamboo flooring; roll-coating transparent putty, drying the transparent putty to be totally solidified and sanding the transparent putty; roll-coating white priming paint and drying the white priming paint to be totally solidified; roll-coating primary colors of wood and drying the primary colors to be totally solidified; automatically correcting the wood grains, roll-coating wood grain colors and drying the wood grain colors to be totally solidified; roll-coating wear-resistant priming paint and drying the wear-resistant priming paint to be semi-solidified; roll-coating elastic priming paint, drying the elastic priming paint to be totally solidified and sanding the elastic priming paint; roll-coating hardened priming paint, drying the hardened priming paint to be totally solidified and sanding the hardened priming paint; roll-coating scratch-resistant finish paint and drying the scratch-resistant finish paint to be semi-solidified; and roll-coating scratch-resistant finish paint, drying the scratch-resistant finish paint to be totally solidified and packaging the bamboo flooring. The manufacturing processes of roll-coated white priming paint, the roll-coated primary colors of the wood and the roll-coated wood grain colors after automatically correcting the wood grains require drying to be totally solidified, interpenetration of the primary colors of the wood, the wood grain colors and other adjacent coatings is eliminated, the coated wood grains are ensured to be clear and neat, and product quality is improved.

The invention provides equipment for directly producing hydrogen through osmotic energy and a use method for the equipment. Specifically, the equipment for directly producing the hydrogen through the osmotic energy comprises a reverse electrodialysis device, an anolyte storage tank, a catholyte storage tank, a concentrated solution storage tank and a diluted solution storage tank. According to the technical scheme, under the circumstance that a power source is not added externally, potential energy difference of saline solutions with different concentrations is used, an alkaline electrolyte and an acidic electrolyte are adopted in an anode chamber and a cathode chamber on the two sides of the reverse electrodialysis device correspondingly, hydrolysis half-reaction occurs on an electrode of the reverse electrodialysis device directly, the hydrogen and oxygen are generated, and the gases are separated on line through a gas-liquid separation system. Through the equipment and the use method, energy consumption of hydrolysis hydrogen production can be lowered, the electrode stability is improved, the process is simple, externally added energy is not needed, pollution is avoided, and hydrogen production efficiency is high.

The invention relates to a small patch fuse and a manufacturing method, in particular to a small patch fuse which can improve the electrical properties, and a manufacturing method thereof. The small patch fuse takes a glass-ceramic layer as the substrate and takes the fuse metal or alloy as the internal electrodes to form a monolithic structure; both end parts of the monolithic structure are provided with end electrodes, wherein, one or more layers of internal electrodes are arranged between two glass-ceramic layers; both ends of each internal electrode are contacted with each end electrode; the middle part of the internal electrode is a fuse part; the upper and lower surfaces of the internal electrode are respectively provided with attached glaze layers; the attached glaze layers cover the entire fuse part of the internal electrode; besides, the length and width of the attached glaze layers are less than the length and width of the monolithic structure. The attached glaze layers can prevent the internal electrodes and the ceramic body penetrating each other in the co-firing process and improve the consistency of product resistance and electrical properties, and also achieve the effect of thermal insulation, so that the fuse part can quickly and effectively act.

The invention discloses a surface-mounted fuser, comprising a fusing chip. The fusing chip mainly consists of termination electrodes, a ceramic substrate, a fuse element layer and an arc extinguishing glass layer, wherein the fuse element layer is located on the upper surface of the ceramic substrate; the two termination electrodes are respectively located at the both sides of the fuse element layer and are electrically connected with the fuse element layer; and the arc extinguishing glass layer covers the fuse element layer and the area, which is close to the fuse element layer, of the termination electrodes. The surface-mounted fuser further comprises a fusing main body the middle of which is provided with a round through hole, wherein the fusing chip is located in the round through hole of the fusing main body; two metal covers are respectively located at the both ends of the fusing main body and cover the round through hole so as to form a sealing cavity; and the termination electrodes are electrically connected with the metal covers through welding sheets. The surface-mounted fuser provided by the invention has high temperature resistance and high strength, can coat fusing wires and arc extinguishing glass inside well so as to greatly improve the entire strength, the breaking capability and the thermal shock resistance of the fuser, and is convenient for large-scale production.

The invention provides a simulation ceramic tile and a preparation method thereof. The ceramic tile comprises a blank layer, a bottom glaze layer and a surface glaze layer, wherein the bottom glaze layer comprises penetrating ink; the maximum penetrating depth of the ink is the thickness of the bottom glaze layer; the penetrating width is fit with a grain boundary of a cross section, the blank layer comprises at least one pug layer and at least one powder layer, the most bottom layer of the ceramic tile is the pug layer, and at least one surface of the powder layer is in contact with the pug layer. Meanwhile, the preparation process of the ceramic tile is also provided, the penetrating depth and width of the ink pigment can be effectively controlled by optimizing and adjusting the ingredients, the process steps and the parameters, the grain fit degree between the bland body and the longitudinal section of the bottom glaze is high, the stereoscopic impression and simulation degree of the ceramic tile are greatly improved, meanwhile, due to the unique sintering process control, the bland body layer does not have a mutual penetration layer, thereby further improving the stereoscopic impression and simulation degree of the ceramic tile.

The embodiment of the invention relates to the field of pipeline repair, and discloses a cured-in-place pipe (CIPP) liner pipe and a method for preparing the CIPP liner pipe. The CIPP liner pipe comprises a fabric layer, a thin film layer and a rubber layer made of rubber which is expandable when meeting water. The fabric layer is in a pipe shape; the thin film layer surrounds the inner surface ofthe fabric layer to form the inner wall of the CIPP liner pipe; and the rubber layer is arranged on the outer surface of the fabric layer. According to the embodiment of the invention, relative to the prior art, the rubber layer made of the rubber which is expandable when meeting the water is arranged on the outer surface (that is, the surface facing the inner wall of a damaged pipeline) of the CIPP liner pipe, when a gap is formed between the CIPP liner pipe and an original pipeline, the intrusive water (that is, groundwater or pipeline sewage entering the gap) can cause spontaneous rapid expansion of the rubber, thus the gap is fully filled with the rubber, and a sealed isolation layer is formed, so that the CIPP liner pipe and the original pipeline are closely attached together, and mutual infiltration of the groundwater and the pipeline sewage is effectively prevented accordingly.

Disclosed is a metallization production method of efficient solar cells. The metallization production method comprises step 1, performing chemical etching and surface texturing after silicon wafers are polished and cleaned; step 2, performing phosphorus doping on the front sides and the back sides of the cells simultaneously to form and produce p-n junctions; step 3, removing phosphorosilicate glass on the surface; step 4, performing thermal oxidation through a tubular diffusion furnace to form passivation antireflection coatings through machining; step 5, utilizing PECVD (Plasma Enhanced Chemical Vapor Deposition) to form surface masks through machining, etching positive electrode graphics on a mask layer through silk screen printing and brushing thin silver paste once; step 6, performing the silk screen printing on the aluminum back surface field and back electrodes and performing back sintering to enable silver silicon metal materials to be alloyed and namely that sintered silver is obtained; step 7, utilizing alternative metallic materials on the surface of front sintered silver so as to increase the thickness of grid lines, wherein the alternative metal is electroplating silver or electroplating nickel, copper and tin; step 8, annealing the cells; step 9, achieving sorting and packing of the cells after a power test, an electrical conductivity test and a strength test of the cells are achieved. The metallization production method of the efficient solar cells is low in cost.

The invention discloses a secondary wire wiring method for a high-voltage / low-voltage switch cabinet. The method comprises the following steps of (1) according to the mounting positions of elements in the switch cabinet, determining the traveling direction of a wire bundle, and meanwhile, according to the traveling direction of the wire bundle, manufacturing a tool frame; (2) separately wiring a primary wire, a secondary wire, a strong-current lead and a weak-current lead in the switch cabinet on one side; (3) using a telescopic tool frame for a door passing line; (4) forming wire outlets in the tool frames used at the wire-outlet positions of a box cover, a plug-in component, a drawer and the elements. The secondary wire in the high-voltage / low-voltage switch cabinet can be regulated, the phenomenon that wires are mutually interwoven is prevented, and the safety of the switch cabinet is improved.

The invention discloses a soil moisture detection device which comprises a shell mechanism, ventilation mechanisms, a lifting mechanism, a detection mechanism and a cleaning mechanism. The ventilation mechanisms are arranged on the upper surface and the lower surface of the shell mechanism, the lifting mechanism is fixedly installed in the shell mechanism, the detection mechanism is arranged in the shell mechanism and fixedly connected with the lifting mechanism, and the cleaning mechanism is fixedly installed on the lower surface of the shell mechanism. According to the soil moisture detection device disclosed by the invention, the plurality of cylinders are arranged at a certain distance, so that soil at different depths and at a certain horizontal distance can be detected at the same time; by arranging the cleaning mechanism, when the detection mechanism retracts into the box body after working, soil on the surfaces of the cylinder body and the drill bit can be cleaned, so that the drill bit can be directly used next time; and by arranging the ventilation mechanisms, moisture on and in the cylinder body can be quickly dried in the air, so that the accuracy of next measurement is ensured.

The invention belongs to the technical field of plant cultivation, and specifically discloses a device used for plant root-dividing soil cultivation. The device includes a cultivation box, partition plates, a field planting hole, a field planting sponge and water infiltration holes; the center of the cultivation box is provided with the plurality of vertical partition plates, and the partition plates divide the cultivation box into a plurality of uniform small boxes; the field planting hole is arranged in the intersection place of the plurality of partition plates, and the field planting sponge used for fixing plant seedlings is arranged on the field planting hole; and the bottom of the cultivation box is provided with the water infiltration holes. The device provided by the invention canbe applied to study on the influence of different nutrient supply on growth of plant root systems; the plant seedlings can be better fixed on the device, the root systems of the plant seedlings can beuniformly divided, the degree of damage of root dividing to the root systems of the seedlings is reduced, and the survival rate of the seedlings after root dividing is improved; and the device is simple and reasonable in arrangement, easy to operate, and suitable for a wide range of promotion and applications.

The invention relates to the technical field of hot-melt technology, in particular to a hot-melt technology for cellulose acetate particles. The steps of the process are: baking particles, color mixing, extrusion, crushing, mixing and hot melting. The present invention maximizes the hot melting effect of acetate cellulose particles and prevents the gap between the two color particles. The mutual penetration of colors improves the color recognition of finished products.

The invention relates to a liquid beverage containing anti-permeation capsules. The liquid beverage is composed of the anti-permeation capsules with waterproof layers and of different tastes and a beverage storage liquid. The liquid beverage has the advantages that the capsules of various tastes are contained, and the capsules impart rich and varied types of flavor experience to the liquid beverage; natural plant polysaccharides are adopted as a membrane material to greatly improve the mouthfeel in an edible process, the problem of membrane penetration in the prior art is also solved, and theunique taste of the capsules can also be kept for a long time.

The invention relates to electrical insulating materials and in particular relates to a high-resistance silicon rubber corona resistant material for a high-voltage motor, which can be used for solving the technical problem that the existing motor corona resistant material is unstable in performance due to influences from working environments. The high-resistance silicon rubber corona resistant material for the high-voltage motor is manufactured by adopting the following process: mixing uniformly a tackifier with silicon rubber on a rubber mixing mill; then adding a plasticizer and mixing uniformly; adding silicon carbide powder subjected to surface activation treatment to the uniformly mixed substance and mixing uniformly; adding a vulcanizing agent and mixing; mixing the vulcanizing agent in the placed silicon rubber mixture and uniformly mixing; heating up and vulcanizing the re-mixed silicon rubber mixture and cooling the heated and vulcanized silicon rubber mixture to obtain the low-resistance silicon rubber corona resistant material for the high-voltage motor. The high-resistance silicon rubber corona resistant material for the high-voltage motor disclosed by the invention is applicable to corona resistant structures of a high-voltage electric generator, a high-voltage motor, a high-voltage variable frequency speed regulation motor and a high-voltage large-capacitance wind driven generator.

The invention discloses a rainbow printing ink fountain with a movable separation plate. The ink fountain comprises a contact inclined surface and circular arc side plates arranged at two sides of the contact inclined surface, wherein one end of the contact inclined surface is fixedly connected with a work platform in an inclined way, the ink fountain also comprises an ink fountain separation plate, and the ink fountain separation plate comprises a circular arc separation plate and a rubber pad. The invention also discloses an assembly method of the rainbow printing ink fountain with the movable separation plate. The ink fountain and the assembly method solve the problems that in the prior art, the ink color phase is easy to change, the printing precision is low, the flexibility is poor, the raw material waste is serious, the ink proportion is not adjustable, the cleaning is inconvenient, and the like. The ink fountain and the assembly method have the characteristics that the structure is simple, the operation is simple, the position of the ink fountain separation plate is adjustable, the isolation performance is good, the number of the ink fountain separation plates and the ink fountain separation plates in different thicknesses can be selected according to requirements, the mounting and the dismounting are convenient, the cleaning is convenient, the printing product quality is stable and reliable, and the like.

The invention discloses a pressure stabilizing device, a tipping paper gluing rotor cooling system and a cigarette making machine, and relates to the field of tobacco machinery for performing well cooling on rotors. The pressure stabilizing device comprises a gas conveying component, wherein the gas conveying component is provided with an input opening and an output opening; the input opening is communicated with a gas source; the output opening is communicated with a cooling tank of the tipping paper gluing rotor cooling system. According to the pressure stabilizing device, cooling liquid can always achieve a cooling effect.

A process for manufacturing composite sheets includes steps of:continuously depositing a web of yarns, in the form of a mat of continuous yarns, a woven, a knit or an assembly of continuous non-interlaced yarns on a moving substrate;depositing a powder of an organic material capable of forming a coating layer under the action of heat on at least one side of said web;heating the web coated with the powder to a temperature sufficient to melt the powder;compressing and cooling the web so as to form a composite strip; andcutting the strip in the form of sheets or winding the strip up on a rotating support.

The invention provides a preparation method of a high-fidelity ceramic tile blank body. The preparation method is characterized by comprising the following steps: 1) respectively putting mud and powder in a ball mill for ball milling and performing spray drying to obtain hard powder; 2) paving mud in a grinding tool, then press-molding and once-firing at a temperature of 850-1000 DEG C; 3) applying the powder onto a mud blank body fired in the step 2) to form a powder layer with texture fine lines and performing HIP treatment; 4) performing secondary firing on the blank body obtained in the step 3), wherein the secondary firing temperature is lower than the primary firing temperature; 5) repeating the steps 2)-4) at least once; 6) firing the finally-obtained blank body at a temperature of1200-1300 DEG C. The blank body obtained by the preparation method provided by the invention has strong stereoscopic sensation on a longitudinal section while having excellent fidelity.

The embodiment of the invention discloses a single-working-medium ocean thermal energy collection and power generation device. The device comprises a pressure-resistant cover, a phase change cylinder,an energy storage cylinder and an expansion machine are arranged in the pressure-resistant cover in sequence, the phase change cylinder is connected with the energy storage cylinder through an energystorage expansion one-way channel of the expansion machine, the energy storage cylinder is connected with the phase change cylinder through an energy release expansion one-way channel of the expansion machine, the energy storage expansion one-way channel and the energy release expansion one-way channel are filled with circulating working media to form a closed circulating loop, and the expansionmachine is connected with a generator. The invention further discloses an ocean thermal energy power generation method. According to the device and the method, the single gas-liquid phase change cycleworking medium is adopted to collect ocean thermal energy, the ocean thermal energy is used for power generation, the maximum pressure intensity of the system can be substantially reduced, the powergeneration time is prolonged, the power generation control process is optimized, and mutual permeation and mixing of the working media are avoided.

The invention discloses a low-carbon rapid maintenance and pavement method for asphalt pavement ruts. The method comprises the following steps: (1), milling an asphalt surface layer; (2), paving a super-viscous emulsified asphalt macadam sealing layer; and (3), paving the surface layer of the cold-mixing and cold-paving pouring type composite pavement. The combined pavement layer obtained by the method has the characteristics of excellent rut resistance, simple maintenance process and environmental protection, and the whole structure has the characteristics of high rut resistance, skid resistance, wear resistance, long service life and low carbon.

A surface-mounted fuse comprises a fusing chip (1). The fusing chip mainly consists of terminal electrodes (2), a ceramic substrate (3), a fusing body layer (4), and an arc extinction glass layer (5). The fusing body layer is located on an upper surface of the ceramic substrate. The two terminal electrodes are located on two sides of the fusing body layer respectively, and are electrically connected to the fusing body layer. The arc extinction glass layer covers the fusing body layer and the regions, close to the arc extinction glass layer, of the terminal electrodes. The surface-mounted fuse further comprises a fuse body (7) having a round through hole (6) in the middle. The fusing chip is located in the round through hole of the fuse body. Two metal covers (8) are located at two ends of the fuse body respectively, and cover the round through hole to form an enclosed chamber. The terminal electrodes are electrically connected to the metal covers through solder lugs (9). The surface-mounted can endure high temperature, has high strength, and can wrap a fuse wire and the arc extinction glass therein. The overall strength, the breaking capability, and the resistance to cold and hot shocks of the fuse are improved, and mass production is convenient.

The invention provides a simulated tile and a preparation method thereof. The tile includes a blank layer, an underglaze layer and a surface glaze layer, the underglaze layer includes penetrating ink, and the maximum depth of ink penetration is the thickness of the underglaze layer , the penetration width coincides with the grain boundary of the blank cross section, the blank layer includes at least one mud layer and at least one powder layer, the bottom layer of the ceramic tile is a mud layer, at least one side of the powder layer is connected with the mud layer touch. At the same time, it also provides the preparation process of the ceramic tile. Through the optimization and adjustment of ingredients, process steps and parameters, the depth and width of ink pigment penetration can be effectively controlled, so that the texture of the green body and the bottom glaze on the longitudinal section is highly consistent, which greatly improves the ceramic tile. At the same time, due to the unique sintering process control, there is no interpenetration layer in the green body layer, which further improves the three-dimensional effect and simulation degree of the tiles.

This invention relates to a grating structure of a carbon nm tube field emission display device and its preparation method, in which, said grating structure takes a glass substrate as a cathode glass baseboard to cover a cathode electrode on the glass substrate and a dense material film layer on the cathode electrode and cover an insulation medium layer on the dense material layer, an insulation hole is set in the middle of the insulation medium layer, the surface of the carbon nm tube slurry layer is exposed in the hole with the bottom smelt in the dense material film layer, a grating electrode is covered on the top of the insulation medium layer, grating small holes are set in the grating electrode and aligned with the insulation medium hole at the bottom and the cross section of the hole is in a bowl structure of wide up and narrow down.

A method for realizing long-term performance stability of an in-vivo pressure sensor is characterized in that a layer of parylene material is deposited on a PDMS film through a chemical vapor deposition method, due to existence of a parylene deposition layer, interpenetration of interface fluid in a pressure cavity and biological tissue fluid is blocked, stability of chemical components in the pressure cavity and the volume of the interface fluid is guaranteed, and the stability of the in-vivo pressure sensor is improved. When the in-vivo pressure sensor packaging film is applied to in-vivo pressure sensor packaging, long-term stability of the performance of a pressure sensor can be guaranteed, and then long-term stability of the in-vivo pressure sensor can be achieved.

The invention belongs to the field of hydraulic devices and particularly relates to a work method for protecting a hydraulic cylinder against damage. According to the work method, a body of the hydraulic cylinder is involved, a piston cavity is formed in the body, a spring for buffering is arranged in the piston cavity, a piston is connected with the piston cavity in a sliding manner, the two sides of the piston are both connected with piston rods, seal rings are arranged at gaps between the body and the piston rods, and a seal ring is arranged at the connection position between the piston andthe body. The body is provided with a first oil opening and a second oil opening which are used for feeding work oil. The first oil opening is located on the left side of the piston. The second oil opening is located on the right side of the piston. The piston rods are provided with u-shaped pipes. The body is provided with a first gas pipe communicating with the outer side and a second gas pipeextending into the piston cavity. The inlet end of the first gas pipe is connected with an external high-pressure gas pump. When the piston moves to the maximum travel position, the u-shaped pipes enable the firs gas pipe and the second gas pipe to communicate. By the adoption of the work method for protecting the hydraulic cylinder against damage, the impact caused by the piston on the hydrauliccylinder can be reduced, and the hydraulic cylinder is protected against leaks and damage.

The invention provides a device capable of directly producing hydrogen by utilizing the salt difference and a use method thereof. Specifically, the equipment capable of directly producing hydrogen by utilizing the salt difference includes a reverse electrodialysis device, an anolyte storage tank, a catholyte storage tank, a concentrated solution storage tank and a dilute solution storage tank. According to the technical scheme of the present invention, under the condition of no external power supply, using the potential energy difference of salt solutions with different concentrations, the anode chamber and the cathode chamber on both sides of the reverse electrodialysis device respectively use alkaline electrolyte and acid electrolyte, directly in the reverse electrodialysis device. The hydrolysis half-reaction occurs on the electrode of the electrodialysis device to generate hydrogen and oxygen, and the gas is separated online by the gas-liquid separation system. The device and its use method can not only reduce the energy consumption of hydrogen production by hydrolysis and improve the stability of electrodes, but also have simple process, no need of external energy, no pollution, and high hydrogen production efficiency.

The invention relates to a method for stabilizing an interface between a perovskite thin film and a hole transport layer. The method comprises the following steps of S1, cleaning a fluorine-doped tin oxide substrate, spin-coating the fluorine-doped tin oxide substrate with a TiO2 precursor solution, and sintering after spin-coating; S2: S21: preparing a 1, 4-dibromobenzene precursor; (S22) preparing a CH3NH3PbI3 precursor; s23, preparing a hole transport layer precursor solution; S3, carrying out three steps of dropwise adding, spin coating and drying on the CH3NH3PbI3 precursor solution prepared in the step S22, and preparing a CH3NH3PbI3 thin film; S4: 1, spin-coating the CH3NH3PbI3 thin film with a 1,4-dibromobenzene precursor solution, and carrying out heat treatment; and S5, spin-coating the hole transport layer material on the surface of the perovskite thin film to obtain a stable interface of the perovskite thin film and the hole transport layer. According to the present invention, the 1,4-dibromobenzene hole transport material can prevent the precursor solution from dissolving the perovskite thin film, and interpenetration between the perovskite thin film and the hole transport layer in the later battery power generation process is avoided.

The invention discloses a preparation method for an antibacterial coat for slowly releasing various cell growth factors on medical metal. According to the method, antibiotic with amino is grafted on graphene oxide by covalent binding, the graphene oxide grafted with the antibiotic is taken as a carrier, and nano-particles, which wrap the various cell growth factors respectively, are fixed between grapheme oxide layers by layer-by-layer self-assembly, so that the coat, which carries the various cell growth factors and the antibiotic at the same time, is obtained on the surface of the medical metal. The coat prepared by the method can independently control the various cell growth factors to be slowly and orderly released, the fixation amount of the cell growth factors is large and the bone induction effect is strong. In addition, the coat can release the antibiotic in the whole process of the slow release of the cell growth factors, thus achieving a long-term antibacterial effect. In addition, the cell growth factors do not interact with the antibiotics, so that the respective efficacy of the cell growth factors and the antibiotics is given full play.

The invention discloses a dual-mode protection system, and belongs to the technical field of isolation tent structures and protection. The dual-mode protection system comprises an isolation tent, a support, a positive and negative pressure air purification and filtration device, a positive and negative pressure switching unit, a positive and negative pressure air purification module, a fan and a control module, and the support is used for supporting the isolation tent to enable the isolation tent to form an isolation space with the ground or independently. The positive and negative pressure switching unit comprises an air inlet duct, an air outlet duct and a three-way valve, the positive and negative pressure air purifying and filtering device is used for exhausting air and filtering air, and the positive and negative pressure switching unit can realize switching of positive pressure and negative pressure in the isolation cabin, so that a positive pressure or negative pressure isolation protection space is formed in the isolation curtain. By using the positive and negative pressure isolation tent, the safety guarantee is provided for people to take traffic tools for reproducing and reworking, different requirements of different use environments on the isolation tent are met, and the utilization rate of the isolation tent is improved.