67results about How to "Block escape" patented technology

The invention relates to a nano-clay-containing irradiation crosslinked polyolefin cable material, which comprises the following raw materials in parts by weight: 55-75 parts of an ethylene-vinyl acetate copolymer, 25-45 parts of metallocene linear low-density polyethylene, 5-10 parts of a grafting material, 2-8 parts of a lubricant, 0.5-2 parts of an antioxidant, 120-160 parts of inorganic filler, 8-15 parts of a charing promoter, 5-15 parts of nano-clay, 0.5-3 parts of a crosslinking sensitizer, and 3 parts of carbon black masterbatch. According to the invention, in the polyolefin cable material, by adding the nano-clay as a flame retardant synergist of the inorganic filler and being fitted with the charing promoter, the nano-clay can increase the viscosity of a melt in the process of polymer burning, so that the barrier property of the melt can be enhanced, the escape of small molecules can be stopped, the heat release rate and the smoke density are greatly reduced, the fireproof performance is improved, and then cables can be subjected to A-class bundled burning, therefore, the cable material can be applied to the spaces with high requirements on oil-resistant and flame retardant properties.

The invention discloses a fish catching device in the unattended ship intelligent fishery. The fish catching device comprises an unattended ship. An intelligent fish catching mechanism and a ship-mounted fabric take-up and pay-off mechanism for lifting up the intelligent fish catching mechanism and putting the intelligent fish catching mechanism in water are arranged on a deck of the unattended ship. The intelligent fish catching mechanism comprises a fish catching box. A fish inlet is formed in the side wall of the fish catching box and provided with a fish cage door. A fish luring lamp is arranged in the fish catching box. A first fish detector for detecting fish swarms is arranged on the outer surface of the bottom wall of the fish catching box. A second fish detector for recognizing whether objects detected by the first fish detector are fish swarms or not and monitoring the number of the fish swarms in the fish catching box is arranged on the inner surface of the top wall of the fish catching box. The catching device is simple in structure and reasonable in design, the fish catching task of the unattended ship intelligent fishery can be completed on the premise of no artificial interference, whole-process unattended fish catching is realized, it is avoided that time and labor are wasted in the fish catching process and a water body is polluted, and the problem that efficiency is low during the fish catching of a traditional fish cage is solved.

The invention relates to an LED extension structure with P type superlattice and a preparation method thereof. The LED extension structure orderly comprises the following parts from the lower side to the upper side: a substrate, a nucleating layer, a buffer layer, n type GaN layer, a multiple quantum well luminescent layer, a first P type GaN layer, P type AlInN / GaN superlattice and a second P type GaN layer; the P type AlInN / GaN superlattice is composed of the AlInN potential well layer and GaN barrier layer overlapped periodically. The AlInN / GaN superlattice structure is adopted for effectively raising the hole concentration, effectively resisting the electron and useful for expanding the hole, the mismatch of the structure lattice is little, the crystal quality is high after growing. The GaN-based LED with P type structure containing AlInN / GaN superlattice can effectively improve the luminous efficiency of the device.

The invention discloses a powder spray device used to make a fluorescent screen powder layer of a low-light-level image intensifier, which comprises an air inlet component including a truncated cone-shaped shell seat, a filtering net, a U-shaped pipe, an electromagnetic valve and a pressure reducing valve, a powder spraying chamber with an air hole, and a fluorescent screen jig with a movable baffle, wherein, the big end and the small end of the truncated cone-shaped shell seat are respectively connected with the lower end of an air jet chamber and the U-shaped pipe, the pressure reducing valve and the electromagnetic valve are sequentially arranged at the other end of the U-shaped pipe, and the fluorescent screen jig is disposed at the upper end of the powder spraying chamber. When in use, the fluorescent screen is placed on the fluorescent screen jig, gases passing through the pressure reducing valve can enter the powder spraying chamber by a pulse mode through the on / off alternating state of the electromagnetic valve under the condition of closed movable baffle, so as to disperse the agglomerated fluorescent powder; and the dispersed fluorescent powder is sprayed on a glue layer of the fluorescent screen evenly under the function of continuous air flow by opening the movable baffle and making the electromagnetic valve be in the open state. The invention solves the problems of bulge points on the powder layer due to agglomeration of fluorescent powder and uneven manual powder dusting.

The invention relates to a multifunctional nanometer cage bioreactor with high stability and recoverability and a preparation method for biomaterial solid borne. The method comprises the following steps: using silicon as a raw material, a surface active agent as a template agent, trialkoxysilane with a functional group which can be loaded to the material surface as a material group reagent, and a mesoporous material synthesizing surface group as a cage body; filling a biological material as a catalytic center in the cage by an adsorption mode; using the reagent with two or more than two reactive groups as the cross-linking agent to connect an aperture modifying materials with bioactivity; and closing the catalytic center in the cage to prevent the catalytic center from escaping from a vector material and to execute a plurality of other biological functions. The multifunctional nanometer cage bioreactor synthesized according to the method is characterized by having a structure which uses a shell as the mesoporous material to fixedly load two or more than two biological materials in different types in sequence according to a selective regulation, and having the advantages of multiple functions, high stability, reutilization and the like.

The invention relates to a follow-up oxygen lance nitrogen seal device comprising a conical seat, a conical plate and a seal plate, wherein, the conical plate and the seal plate are sheathed on the oxygen lance; the conical seat at least comprises a reversed conical inner cone seal surface; the conical plate comprises a reversed conical outer cone seal surface matched with the inner cone seal surface of the conical seat, and an oxygen lance channel arranged in the outer cone seal surface and the diameter of which is larger than the outer diameter of the oxygen lance; an upper cover plate and a lower cover plate are arranged between the outer cone seal surface and the oxygen lance channel; the seal plate is a cylindrical object, and can be movably located on the upper cover plate of the conical plate; a plurality of nitrogen seal rings are fixed in the side wall of the seal plate in an axial direction; the oxygen lance enters the oxygen lance inlet of the converter through the conical plate; the inner diameter of the nitrogen seal ring and the outer diameter of the oxygen lance form clearance fit; and the nitrogen is spouted out by the nitrogen seal ring. The seal plate provided by the invention can move on the surface of the conical plate along the oxygen lance, thus the oxygen lance not only has a certain free degree in a horizontal level, but also has good seal effect.

The invention provides a swatter and aims to solve the problem that the mosquito killing efficiency is low. The swatter can suck mosquitoes and improve the mosquito efficiency. According to the technical scheme, the swatter includes a circular-ring-shaped swatter frame and a swatter handle connected with the swatter frame; the swatter frame is rotatably connected with a power grid, the center ofthe power grid is located on a center line of the swatter frame, the swatter frame is provided with an air draft device which can suck air at the power grid, the air draft device is connected with a linkage part drives the power grid to rotate, the side, away from the air draft device, of the swatter frame is provided with a cushioning element, and the cushioning element extends in the circumferential direction of the swatter frame. When the swatter is used for catching the mosquitoes, the mosquitoes are driven to be close to the swatter through air motion, the mosquito killing operation is thus easier, and the mosquito killing efficiency is improved.

The invention proposes a lead-acid battery acid mist centralized absorption device, which absorbs the acid mist from the opening of the environmental protection pipe and turns into a tank acid mist space of about 20m 3 , the acid mist space is 1.4m using the gas collecting pipe 3 , The power consumption of acid mist purification equipment can be reduced by 90%; adding acid-resistant silk fabrics in the acid mist concentration container can block the escape of part of the acid mist, and the acid mist concentration can be reduced by 35%; the gas collecting pipe is used for concentrated absorption of acid mist, The sulfuric acid content in the air in the measured operating area is from 7.6 mg / m 3 reduced to 0.34mg / m 3 , far below the national standard requirements.

The invention provides a refining method of active metallurgical lime and relates to the field of production and preparation of lime. The method specifically comprises pretreatment, preheating treatment, calcination treatment and cooling treatment. According to the refining method of the active metallurgical lime, by controlling CaO content and granularity of raw materials, calcination temperatureof a reaction process and fuel, activity of the active lime is improved, sulfur content is reduced, and quality of the active lime is improved.

The invention discloses nano PVC flame-retardant waterproof tarpaulin and a preparation method thereof. The nano PVC flame-retardant waterproof tarpaulin is prepared by the steps that a synthetic fiber base cloth is dipped with PVC nano flame-retardant plasticizing paste, particles with very small nano-penetrant penetrate completely into the fiber gaps of the base cloth, and then the base cloth isflattened by a flattening machine and is heated and plasticized by a drying oven to prepare into a covering film with smooth two sides, so that the tarpaulin is quite high in water permeability resistance. The problems that in the prior art, the tarpaulin covering film is easy to fall off and skin is broken are solved. According to the formula, synthetic plant fatty acid ester with the flame retardant property, and polishing slag with flame retardant and smoke suppression performance are added, so that the problem that the flame retardant performance is reduced due to the addition of a largenumber of small molecule plasticizers in the prior art is solved. The polishing slag is added in a large amount as inorganic filler, so that the production cost is reduced, the flame-retardant and smoke suppression performance of the PVC flame-retardant waterproof tarpaulin is improved, and the problem of environmental pollution caused by waste landfill due to difficult recycling of stone, ceramictiles and artificial stone polishing residues is solved.

The invention discloses a nano flame-retardant antistatic air duct cloth and a preparation method thereof. The nano flame-retardant antistatic air duct cloth is prepared by dipping synthetic fibrous base cloth into PVC flame-retardant antistatic plasticizing paste containing a nano penetrating agent, flattening the synthetic fibrous base cloth by a flattening machine, heating and plasticizing thesynthetic fibrous base cloth in a drying oven to prepare a covering film with a flat and smooth surface, and cooling the covering film to obtain the nano flame-retardant antistatic air duct cloth. Theplasticizing paste completely permeates into the synthetic fibers, and the problem of air leakage of an air duct caused by easy falling and skin breaking of a covering film in the prior art is solved. Synthetic vegetable fatty acid ester with flame-retardant and antistatic properties and stone, ceramic tiles and artificial stone polishing slag with flame-retardant and smoke-suppressing propertiesare added into the formula, so that the problem that the flame-retardant property is weakened due to the addition of a large amount of a small molecular plasticizer in the prior art is solved. A large amount of polishing slag taken as an inorganic filler is added, the production cost is reduced, the flame retardant property and smoke suppressing performance of the product are improved, the problems that the polishing slag is difficult to recycle and environmental pollution is caused by waste landfill are solved, and waste is turned into resources.

The invention relates to a method for preparing a biological crust sand-fixing material, and belongs to the technical field of environmental protection materials. Pyrolysis oil is used as a main product of rapid pyrolysis of agricultural and forestry biomass and generates urea-formaldehyde resin as a chemical sand-fixing agent together with urea and formaldehyde to improve the hydrophilic propertyand water retention property of soil, the silicon hydroxyl contained in the surface of attapulgite can be further activated by acid modification, a composite high water absorbing material is preparedby polymerization grafting reaction of the attapulgite and the urea-formaldehyde resin, stable amide and amine generated by the reaction of the pyrolysis oil and the urea form an effective slow-release nitrogen fertilizer, and the lignin in the pyrolysis oil is a humic acid-containing substance that can return carbon in the fertilizer to the soil to provide a stable growth promoting environment for the formation of microalgae biological crusts, so that a certain amount of desert algae grafted can promote rapid formation of cyanobacteria crusts on the surface of quicksand to achieve biologicalsand fixation and chemical sand fixation.

The invention discloses a range hood with an oil screen capable of being turned to open. The range hood comprises a shell, a fan assembly arranged in the shell, a smoke exhaust box arranged above theshell, a panel, an oil screen, a smoke baffle and a sliding assembly, wherein the panel is arranged below the front side of the shell, the smoke baffle is movably arranged above the panel, one end ofthe sliding assembly is fixed on the inner side of the smoke baffle, the other end of the sliding assembly is hinged to the shell, the oil screen is arranged on the sliding assembly and moves up and down along the sliding assembly along with the smoke baffle to be opened or closed, the smoke baffle is turned outwards to open, the sliding assembly drives the oil screen to turn outwards, the fan assembly sucks air in a kitchen through the oil screen and exhausts oil smoke to a public flue or the outdoor through the smoke exhaust box, after the oil screen is opened, the direction of an air inletis basically consistent with the rising direction of the oil smoke and is close to a smoke source, the oil smoke can be quickly sucked, the smoke baffle further blocks the oil smoke from escaping forwards, and therefore the oil smoke suction effect is greatly improved.

The invention relates to a marine air layer resistance-reducing energy-saving device which comprises a ship body. One or more sets of air supply systems are arranged in the ship body. The output end of a single set of air supply system is connected with a ventilation main pipe, the output end of the ventilation main pipe is sequentially connected with multiple stages of pipelines, and an air cavity air conveying pipe is installed in the front of the joint of every two adjacent stages of pipelines in a penetrating mode. Pressure stabilizing cavities are fixedly formed in the ship bottom of theship body and distributed in parallel in the width direction of the ship body, a plurality of downwards-penetrating air spraying heads are arranged on the pressure stabilizing cavities side by side, and air holes are formed in the outer wall of the ship bottom. The air cavity air conveying pipes convey air into the pressure stabilizing cavities through air cavity injection pipes, and the air is output through the air spraying heads and forms an air layer on the outer wall of the ship bottom. Air is injected between the outer surface of the ship body and water to form uniform and stable gas-liquid two-phase flow, so that the navigation resistance of the ship is reduced, and the propulsion efficiency of the ship is improved. A remarkable application effect can be achieved on resistance reduction and speed increase of a high-speed boat and energy conservation and emission reduction of a large transport ship, and construction of a green and low-carbon ship transport system is effectively assisted.

The invention discloses halogen-free flame retardant foamed EVM (ethylene vinyl acetate copolymer) rubber and a manufacturing method thereof. The rubber is prepared from the following raw materials inparts by weight: 100 parts of EVM 500PXL, 10-20 parts of carbon black N774, 5-7 parts of a plasticizer DOS, 5-7 parts of a plasticizer TOTM, 1-2 parts of zinc stearate, 1-2 parts of a dispersing agent, 1-2 parts of polyethylene wax, 4-6 parts of a foaming agent HH138, 2-3 parts of a cross-linking agent BIBP, 1-2 parts of a cross-linking agent TAIC, 3 parts of an antihydrolysis agent P50, 1-2 parts of preservation wax, 1-2 parts of an anti-aging agent 445, 1-2 parts of an anti-aging agent TMQ and 80-120 parts of flame-retardant fillers. The manufacturing method comprises the following steps: kneading and milling the raw materials, so as to obtain a rubber compound material; feeding the rubber compound material into a pin cold feed extruder, so as to extrude a higher-density preformed film;slicing the preformed film on a conveying belt at a fixed length, so as to obtain a film with the fixed length; performing primary sulfurization foaming on the film with the fixed length with a primary square mould and secondary sulfurization foaming on the film with the fixed length with a secondary square mould; naturally cooling for 10-15 days under a normal temperature, so as to obtain the halogen-free flame retardant foamed EVM rubber. The EVM rubber is strong in toughness, good in heat preservation and good in elasticity and is high-low temperature-resistant, anti-aging, oil-resistant,halogen-free, flame-retardant, environmentally friendly and non-toxic.

The invention provides a filter cartridge cleaning device comprising a shell, a rotating mechanism and a filter cartridge mounting mechanism; the shell comprises a box body and a box cover; the box body is connected with the box cover; the rotating mechanism comprises a first motor and a connecting rod; an air inlet hole is formed in the box body; an air outlet hole is formed in the shell; the filter cartridge mounting mechanism comprises a first connecting assembly, a second connecting assembly and a motor moving assembly; the first connecting assembly and the second connecting assembly are oppositely arranged, one end of the connecting rod is connected with the first motor, and the other end of the connecting rod is connected with the first connecting assembly; the motor moving assemblyis arranged on the box body, and the first motor is arranged on the motor moving assembly. According to the filter cartridge cleaning device, dust outside the filter cartridge is removed under the combined action of wind power and centrifugal force, water is not used for cleaning, sewage is prevented from being generated, and harm of the dust to human bodies is reduced.

The invention discloses an in-situ reduction system for gas-phase pollutants at a refuse landfill based on an intercalation function layer. The system comprises the intercalation function layer disposed above a refuse heap body of the refuse landfill and under a closure covering system, wherein the intercalation function layer comprises a gas-permeable film layer, functional filling layer and an HDPE film layer which are disposed in succession; and a power-free air automatic exchange system is also disposed in the functional filling layer. Mineralized refuses in the functional filling layer are characterized by a high organic content, a large number of microbe, abundant porous structures of mud carbon, a high content of nitrogen in straw stalks after oxidative ammonolysis and so forth andthe power-free air automatic exchange system is installed to promote formation of an aerobic environment for microbial activities, so the system can effectively reduce a release concentration and a release amount of the gas-phase pollutants at the refuse landfill. Application of the system in a current refuse landfill structure has the advantages that operations are simple; cost is low; adsorptionand degradation effects are good; and social and economic benefits are very high.

The invention discloses a guide chute. The guide chute comprises a short end connection plate, a short end blocking apron, a short end compression bar, a long end connection plate, a long end strengthening bar, a long end compression bar and a long end blocking apron. The short end connection plate is connected with the short end blocking apron which is connected with the short end compression bar. The long end connection plate is connected with the long end strengthening bar and the long end compression bar which is connected with the long end blocking apron. The short end connection plate is connected with the long end connection plate, and the short end blocking apron is connected with the long end blocking apron. The short end connection plate and the long end connection plate are made of fine carbon steel plates. Other three sides are in folded structures except the short end connection apron and the long end connection apron which are three-rubber two-line rubber delivery belts and are partitioned into strips at equal intervals, and cracking stop holes are drilled at top end openings of the strip aprons. The guide chute has the advantages of being simple in structure, convenient to operate, quick to mount, tight in sealing, good in operation environment, safe and reliable and the like.

The invention discloses a potential energy-saving lithium battery. The potential energy-saving lithium battery comprises a sealing aluminum-plastic composite film positioned on the outer layer and a cell positioned in the aluminum-plastic composite film, wherein the cell is formed by winding or laminating a positive plate, a membrane tape and a negative plate; the surface, away from the membrane tape, of the positive plate is coated with a positive pole metal film; the surface, away from the membrane tape, of the negative plate is coated with a negative pole metal film; the positive pole metal film is connected with the negative plate through a wire; the negative pole metal film is connected with the positive plate through a wire; each of the positive pole metal film and the negative pole metal film consists of a metal sheet and an insulating film, each metal sheet is wrapped in the corresponding insulating film, and the wires are connected with the metal sheets. According to the lithium battery, the positive plate and the negative plate of a traditional lithium battery are coated with a metal film respectively, and are connected with the corresponding positive plate and negative plate through the wires, so that two pole plates of a capacitor are formed, an extra voltage is provided for an electrode reaction, the activation energy of the electrode reaction is overcome, particles participating the reaction are activated, the concentration polarization is eliminated, the conversion efficiency of the lithium battery is improved, and the service life of the lithium battery is prolonged.

The invention relates to a cell, an immunotherapy product, a gene editing method, a cell preparation method and the application. The invention discloses a cell which is a CAR-NK cell obtained after a target site is knocked out through an RNP compound, the RNP compound comprises Cas9 protein and sgRNA, the target site is PD-1, and the sgRNA at least comprises a nucleotide sequence SEQ ID NO: 8 and a nucleotide sequence SEQ ID NO: 12. According to the scheme, the anti-tumor activity of cells and the killing effect on tumor cells are effectively improved, and the compound can be developed into an effective anti-tumor biological preparation.

The invention discloses a laser diode and a manufacturing method thereof, and belongs to the technical field of semiconductors. The laser diode comprises a substrate, an epitaxial layer, an N-type electrode, a P-type electrode, a first reflecting layer and a second reflecting layer, wherein the epitaxial layer comprises a buffer layer, an N-type semiconductor layer, an active layer and a P-type semiconductor layer; the surface of the P-type semiconductor layer is of a ridge waveguide structure; the P-type semiconductor layer is provided with a first groove and a second groove; the P-type semiconductor layer and the active layer form a cylinder structure, wherein the side surface of the cylinder structure comprises a first curved surface, a first plane, a second curved surface and a secondplane; the first plane and the second plane are parallel to the extending direction of a ridge in the ridge waveguide structure, and the curvature of points on the first curved surface and the secondcurved surface is firstly reduced to 0 in the direction from the first plane to the second plane, then kept to 0 and finally increased from 0; and the first reflecting layer and the second reflectinglayer are laid on the first curved surface and the second curved surface respectively. The light emitting efficiency of the laser diode can be improved.

The invention discloses a ternary composite self-repairing unfired sliding plate brick and a preparation method thereof. The ternary composite self-repairing unfired sliding plate brick is prepared from the following components in percentage by mass: 5 to 10 parts of macrocrystalline fused magnesite with the particle size of 3 to 1mm, 15 to 25 parts of macrocrystalline fused magnesite with the particle size of 2 to 1mm, 5 to 15 parts of macrocrystalline fused magnesite with the particle size of 1 to 0.5 mm, 5 to 10 parts of macrocrystalline fused magnesite with the particle size of 0.5 to 0mm, 12 to 20 parts of 200-mesh macrocrystalline fused magnesite, 1 to 4 parts of -197 graphite, 0.5 to 3 parts of Al4SiC4 micro powder, 0.5 to 2 parts of nano SiC micro powder, 3 to 8 parts of 325-mesh metal Al powder, 0.5 to 3 parts of 200-mesh metal Si powder, 0.5 to 2 parts of boron carbide, 0.5 to 1 part of silicon boride, 2 to 4 parts of thermosetting phenolic resin and 2 to 4 parts of organic silicon resin. The ternary composite self-repairing sliding plate brick has a self-repairing function when being used at high temperature, and the oxidation resistance and high-temperature stability of a sliding plate are remarkably improved.

The invention discloses a method for efficiently trapping and controlling Armadillidium vulgare Latreille in the field of panax notoginseng. According to the method, in the early planting stage of panax notoginseng: panax notoginseng seeds are sown or panax notoginseng seedlings are transplanted, 5% chlorpyrifos granules are applied twice in the first ten days of May in the standard that 2 kg of chlorpyrifos granules are applied to every 667 m<2> of the field; in the later planting period of panax notoginseng, an Armadillidium vulgare Latreille trap is adopted for physically controlling Armadillidium vulgare Latreille after the first ten days of August. Through combination of chemical control and physical control, the application quantity of pesticides is reduced by 2-4 kg all the year round, the trapping effect in 3-7 days reaches 61.96%-64.20%, increase of the Armadillidium vulgare Latreille in the field of panax notoginsen is effectively controlled, the Armadillidium vulgare Latreille is effectively trapped, pesticide residues are reduced, the farm land environment is protected, safety of panax notoginseng products is guaranteed, and the yield and the quality of panax notoginseng are improved.

The invention discloses a composite film electrode and application thereof in a perovskite photoelectric device. The composite film electrode comprises a transparent conductive oxide layer and a low-cost metal layer which are sequentially compounded, and the transparent conductive oxide layer is made of any one or combination of indium tin oxide, fluorine-doped tin oxide, tungsten-doped indium oxide, indium zinc oxide, aluminum-doped zinc oxide and zinc tin oxide. The low-cost metal layer is made of any one of copper, aluminum, nickel, zinc, tin, iron and silver and alloy and combination of the copper, the aluminum, the nickel, the zinc, the tin, the iron and the silver. The invention provides the composite film electrode based on the low-cost metal and the transparent conductive oxide, and the composite film electrode is successfully applied to a perovskite photoelectric device represented by a perovskite solar cell, so that the comprehensive stability of the perovskite photoelectric device is greatly improved on the basis of realizing relatively high photoelectric conversion efficiency of the perovskite photoelectric device.

The invention relates to a cable material and a preparation method thereof, in particular to a method for preparing a flame-retardant cable material. In the present invention, sodium aluminate solution is neutralized with aluminum sulfate and ultra-fine aluminium hydroxide powder is obtained through gel crystallization. After the aluminum hydroxide powder is modified, the modified aluminum hydroxide powder is blended with other synergistic flame-retardant materials and matrix resin, pelleting is carried out and then hot-pressing is carried out to obtain the flame-retardant cable material. Thesurface of the EVA resin is coated by the aluminum hydroxide powder, and as crystal nuclei are continuously generated, a core-shell structured coated type composite powder is finally formed and functions as a flame retardant. Aluminum hydroxide is packed into the matrix resin to construct a carbonized layer, which can not only prevent heat and oxygen from entering, but also prevent small moleculesof flammable gas from escaping. Red phosphorus reacts with free radicals to inhibit production and degradation of free radicals, and polyphosphoric acid can be obtained during the reaction. Polyphosphoric acid can dehydrate and carbonize the flame-retardant materials, and thus make the cable material difficult to burn. When the matrix resin is burnt, the char yield of the matrix resin is high. The flame-retardant cable material disclosed by the invention has broad application prospects.

The invention discloses a flame-retardant antistatic PVC wire and cable material and a preparation method thereof. Synthetic vegetable fatty acid ester with flame-retardant and antistatic properties and stone, ceramic tile and artificial stone polishing slag with flame-retardant and smoke-suppressing properties are added into the formula of the flame-retardant antistatic PVC wire and cable material, and the flame-retardant antistatic PVC wire and cable material is prepared by mixing, extruding and pelletizing. The synthetic vegetable fatty acid ester and the polishing slag are matched for useto generate a good synergistic flame retardant effect to replace an expensive flame retardant in the prior art, so that the production cost can be reduced, and the problem that the flame retardant property is reduced due to the addition of a large amount of small molecular plasticizers in the prior art is solved. A large amount of polishing slag is added as an inorganic filler, so that the production cost is reduced, the flame retardant property and smoke suppression performance of the flame-retardant antistatic PVC wire and cable material are improved, and the problems that stone, ceramic tiles and artificial stone polishing slag is difficult to recycle, and environmental pollution is caused by waste landfill are solved.

The invention discloses a flame-retardant PVC wood-plastic profile and a preparation method thereof. The flame-retardant and smoke-suppressing properties of various oxides and chlorides in stone, ceramic tiles and artificial stone polishing residues are fully utilized to replace expensive flame retardants in the prior art, and the flame-retardant PVC wood-plastic profile with good flame-retardantand smoke-suppressing properties for outdoor garden wood, fences, architectural decoration plates and doors and windows is prepared through the steps of pretreatment, mixing, extrusion and the like. In the formula, the polishing slag can replace calcium carbonate to serve as an inorganic filler to be filled into a large number of flame-retardant PVC wood-plastic profiles, so that the production cost can be reduced, the problems that stone, ceramic tiles and artificial stone polishing slag are difficult to recycle and environmental pollution is caused by waste landfill are solved, and waste isturned into wealth.

The invention discloses a sealed smoke hood suitable for a rotary electrode vacuum electroslag remelting technology. A smoke hood body is connected with a lifting platform of a rotary electrode vacuumelectroslag furnace in rotary electrode vacuum electroslag remelting equipment through a smoke hood suspension device arranged at the upper end of the smoke hood body; a rotary shaft of a rotary electrode vacuum electroslag furnace in the rotary electrode vacuum electroslag remelting equipment penetrates through an upper end opening of the smoke hood to enter the smoke hood body, the lower portion of the smoke hood body is in butt joint with a crystallizer of the electroslag furnace, a sealing sleeve is arranged on the upper portion of the smoke hood body, the upper end face where a pump-outpipeline is arranged and the side edge of the sealing sleeve are connected with of a vacumm pump of the rotary electrode vacuum electroslag furnace; and a water inlet pipe and a water outlet pipe arerespectively arranged at the upper part and the lower part of the side wall of the smoke hood body and communicate with a water circulation system in the rotary electrode vacuum electroslag remeltingequipment. By improving the sealing smoke hood, the problems of rotating body sealing and vacuum environment sealing in a rotary electrode vacuum electroslag remelting system are solved, the refiningeffect of an electroslag remelting process is improved, the structure is simple, and the sealing performance is good.