1859results about "Insulating conductors/cables" patented technology

The invention discloses a high-temperature-resistant composite insulated cable for an intelligent power grid, and belongs to the technical field of cables. The objective of the invention is to solve the problems of single function, poor high-temperature resistance and easy overload failure of the existing cable. The cable sequentially comprises a compressed circular tinned copper conductor, an inner shielding layer, an XLPE inner insulating layer, an outer shielding layer, a self-repairing composite insulating layer, a metal shielding layer and an outer sheath layer from inside to outside, the self-repairing composite insulating layer is prepared by blending a self-repairing polymer matrix and a microencapsulation phase change material, and the melting point of the microencapsulation phase change material is accurately matched with the double dynamic bond response temperature of the self-repairing matrix. Through cooperation of self-repairing and thermal buffering functions, integration of multiple functions of high temperature resistance, self-repairing and thermal buffering is achieved, the long-term working temperature reaches 105 DEG C or above, no breakdown occurs during thermal shock at 180 DEG C, the overload repairing rate exceeds 80%, the high-temperature and overload working conditions of an intelligent power grid can be effectively adapted, the preparation steps are clear and reproducible, and remarkable technical advantages and application value are achieved.

The invention relates to the technical field of cables, and particularly discloses a high-performance halogen-free flame-retardant flexible power cable. The high-performance halogen-free flame-retardant flexible power cable comprises a core layer, an insulating layer, a flame-retardant layer, a shielding layer and a protective layer which are arranged in sequence, the flame-retardant layer is prepared from the following raw material components in parts by weight: 30 to 40 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of polyolefin elastomer, 8 to 10 parts of microencapsulated ammonium polyphosphate, 2.5 to 4.5 parts of pentaerythritol, 20 to 30 parts of inorganic flame retardant, 5 to 8 parts of expansible graphite, 2 to 3 parts of diatomite, 0.5 to 1.5 parts of nano kaolin, 2 to 3 parts of zinc borate, 0.1 to 0.5 part of antioxidant and 0.5 to 1.0 part of lubricant. The cable provided by the invention not only has good flame retardant property, but also has certain flexibility.

The invention relates to a copper cable insulation layer extrusion molding method and system based on dynamic temperature control, and belongs to the technical field of copper cable production. The method comprises the steps that the surface temperature of a copper core before the copper core enters an extrusion die head and the melt temperature of a plurality of independent temperature control sections divided by the extrusion die head in the material advancing direction are obtained in real time; meanwhile, feedback adjusting quantity is calculated based on the temperature difference between the melt temperature and the preset target melt temperature, the feed-forward compensation quantity and the feedback adjusting quantity are superposed to obtain comprehensive adjusting quantity of the heating power of each section, and real-time closed-loop adjustment is conducted on the heating power of each section of the extrusion die head according to the comprehensive adjusting quantity; and the flow and the temperature of the cooling medium are adaptively adjusted according to the temperature gradient of the surface temperature along the axial direction, and non-uniform gradient cooling is carried out on the insulating layer. The copper cable insulation layer extrusion molding method and system based on dynamic temperature control at least solve the problems of poor thickness uniformity of an insulation layer, large internal residual stress and unstable adhesive force with a copper core in the prior art.

The invention relates to the technical field of high-voltage electrical equipment, and particularly discloses a high-insulating-property thermoplastic sleeve and a method for preparing the same based on a co-extrusion process, the surface of a nonlinear layer is wrapped with an insulating material, so that the corona discharge phenomenon is avoided; and meanwhile, the same thermoplastic material is adopted as the insulating layer (including the first thermoplastic layer and the second thermoplastic layer) material and the base material of the nonlinear layer, so that no obvious interface exists between the insulating layer and the nonlinear layer, charge accumulation is avoided, insulation failure is avoided, the insulation and voltage resistance of the sleeve is improved, and the operation reliability is improved.

The application provides a high-voltage cable preparation method and a high-voltage cable. The preparation method comprises the following steps: preparing modified polyvinyl chloride, wherein the modified polyvinyl chloride comprises polyvinyl chloride and a filler added into the polyvinyl chloride; taking 100 parts by weight of the polyvinyl chloride as a base material, and the filler comprises the following components in parts by weight: 1-2 parts of polyethylene, 2-3 parts of a filler, 2-3 parts of a lubricant and 2-5 parts of a toughening agent; extruding the modified polyvinyl chloride on the outer surface of a smooth metal sheath layer to form a modified polyvinyl chloride sheath, and the modified polyvinyl chloride sheath is bonded to the smooth metal sheath layer; and the smooth metal sheath layer is wrapped on the outer surface of a cable core. The high-voltage cable preparation method can greatly improve the flame-retardant performance of the high-voltage cable.

The invention relates to a composite cable, and relates to the technical field of cables, the composite cable comprises a conductor layer, a composite insulating layer, a waterproof layer, a weather-proof sheath layer and an armor layer from inside to outside in sequence, the conductor layer comprises at least six tinned copper conductors, the tinned copper conductors are symmetrically arranged in a regular hexagon shape, dielectric elastomers are filled among the conductors, and the dielectric elastomers are arranged between the tinned copper conductors. The composite insulating layer comprises an inner shielding layer, a main insulating layer and an outer shielding layer from inside to outside, the waterproof layer is a fluororubber extruded layer, the weather-proof sheath layer comprises a bonding transition layer and a weather-proof functional layer, and the armor layer is of a stainless steel band spiral wrapping structure. The composite cable can meet the requirement for high performance in a harsh environment and can show excellent performance under the extreme conditions of low voltage, large day and night temperature difference, strong ultraviolet rays, sand and dust abrasion, acid rain corrosion and the like.

The invention relates to the technical field of metal wire processing, and discloses a high-performance metal wire plastic coating process for aerospace engineering, which comprises the following steps: carrying out base material type selection on a metal wire, and carrying out surface treatment of precise cleaning, etching and depth gradient activation; a Ti-Cr alloy and graphene-copper composite transition layer is deposited through a magnetron sputtering technology, and a multi-layer coating structure is formed through electrostatic spraying of a base coating, a fluidized bed dipping function layer and high velocity oxy-fuel spraying of a nano composite coating in sequence; the molybdenum-gold composite sealing layer is prepared by adopting an electric arc spraying technology, and is subjected to vacuum ultraviolet curing enhancement, high-temperature gradient annealing, gradient sintering and vacuum curing treatment; and heat radiation on the surface of the coating is enhanced through laser-induced micro-nano structure regulation and silicon nitride film sputtering. Through collaborative optimization of base material treatment, coating construction, function strengthening and quality control, the interface bonding strength, the comprehensive performance and the environmental adaptability of the spaceflight metal wire coating are remarkably improved, and the service life of the spaceflight metal wire coating is remarkably prolonged.

The invention relates to the technical field of cable manufacturing, in particular to cable insulation sheath extrusion molding equipment which comprises an extrusion device, and the extrusion device comprises an extrusion head and a rotating assembly. The plurality of convex surfaces are uniformly arranged on the outer wall of the extrusion head along the circumferential direction, so that the radial distribution of the molten material in the flow channel is adjusted, and the molten material is guided to supplement gaps among strands of the multi-strand stranded cable. Meanwhile, the extrusion head is driven by the rotating assembly to rotate, so that the convex surface can adapt to the outline of the outer surface of the cable in real time. Therefore, it is ensured that the thickness of the insulating layer is uniform, the surface of the insulating layer is smooth, the phenomenon that materials are excessively gathered towards gaps or are not evenly distributed is avoided, the electrical hidden danger of an over-thin area is eliminated, material waste of an over-thick area is reduced, and the insulating performance and the material utilization rate of the cable are improved.

The invention discloses a preparation method of an insulated wire. Specifically, the method comprises the following steps: annealing a rolled conductor to obtain an annealed conductor; the periphery of the annealed conductor is coated with insulating paint to form a first prefabricated core wire, the first prefabricated core wire coated with the insulating paint is subjected to high-temperature curing to form an insulating layer, and a second prefabricated core wire is obtained; the outer side of the insulating layer of the second prefabricated core wire is coated with finish paint containing a modified polyamide-imide intermediate to form a third prefabricated core wire, the third prefabricated core wire coated with the finish paint is subjected to high-temperature curing to form a finish paint layer on the outer side of the insulating layer, and the insulated wire is further obtained. The insulated wire provided by the invention improves the wire flexibility, adapts to closer arrangement of complex slot types, and further improves the slot fullness rate of a motor, thereby reducing the size of a stator core under the same power, indirectly reducing the weight of the motor and meeting the requirement of light weight.

The invention discloses a flame-retardant cable and a preparation method thereof. The cable comprises conductor wire cores, a fireproof layer, an insulating layer, a shielding layer, a filling layer and a sheath layer from inside to outside. According to the cable sheath layer, 100 parts of high density polyethylene (HDPE), 5-15 parts of ethylene-vinyl acetate rubber and 3-10 parts of fluororubber are used as main materials, triallyl isocyanurate and bisphenol A diallyl ether are introduced for synergistic crosslinking, and nano montmorillonite is used as an auxiliary material, so that a compact interpenetrating network is constructed. The tensile strength of the sheath layer composite material is greater than or equal to 26.5 MPa, the elongation at break is greater than or equal to 387%, the performance retention rate is greater than 92% after the sheath layer composite material is soaked in slurry for 28 days, the limit oxygen index is greater than 38%, the water vapor transmission coefficient is less than or equal to 1.5 * 10 <-4 > g.mm / (m < 2 >. D.Pa), and the sheath layer composite material has excellent flame retardance, barrier property and slurry resistance and is suitable for harsh outdoor environments such as rail transit.

The invention relates to the technical field of cables, and provides a medium-voltage power cable and a manufacturing method thereof.The medium-voltage power cable sequentially comprises a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a metal shielding layer, a lining layer, an armor layer and a sheath layer from inside to outside; the sheath layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride, 20-25 parts of a flame retardant, 30-40 parts of a plasticizer, 1-3 parts of an antioxidant and 20-25 parts of an inorganic composite material; the inorganic composite material is obtained by treating white carbon black with lignin and polyethylene glycol dimethacrylate, crushing and carbonizing. According to the technical scheme, the problem that the low temperature resistance of the medium-voltage power cable sheath layer is insufficient in the prior art is solved.

The invention relates to the technical field of transposed conductors, in particular to a preparation process of an ultrathin paint film transposed conductor, which comprises the following steps of: coating acetal paint on a base material, then coating intermediate modified paint, finally coating outer paint, and processing a treated copper wire into the transposed conductor. According to the ultrathin paint film transposed conductor, a copper wire is cleaned through absolute ethyl alcohol, then acetal paint, intermediate modified paint and outer paint are coated in a matched mode, finally, the transposed conductor is manufactured through the transposed conductor device and the wrapping device, the electrical performance, the heat conduction performance, the salt mist resistance and the high temperature resistance of the product are excellent, and the service life of the product is prolonged. Meanwhile, the impact resistance and the waterproof effect of the product are excellent, and the comprehensive coordination of the product is improved in a balanced manner.

The invention relates to the technical field of cables, and discloses a high-voltage cable with high safety performance. The cable comprises a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, an inner buffer layer, a protective layer, a reinforced steel cable, an outer buffer layer and an outer protective layer which are sequentially and coaxially arranged from inside to outside. The protective layer is composed of a plurality of sets of protective units arranged in an array mode in the axial direction, and each protective unit is of an annular structure defined by a plurality of protective pieces in the circumferential direction. The inner wall and the outer wall of the protection piece are arc-shaped, steel cable grooves are formed in the two sides of the protection piece, and hollow grooves are formed in the protection piece; the multiple protection units are in staggered butt joint to form a continuous spiral surrounding structure. And the reinforcing steel cable is spirally wound and embedded in a spiral channel formed by the steel cable grooves of the protective sheets. Uniform conversion and dispersion from axial tension to radial stress are realized, the design of the rhombic protection sheets and the hollowed-out grooves is combined, the tensile resistance, extrusion resistance, impact resistance and cutting resistance of the cable are remarkably improved, and the cable is suitable for a complex laying environment.

The invention discloses a preparation method of a tinned copper core fluorinated ethylene propylene insulated cable for aerospace, and relates to the technical field of aerospace cable preparation methods. The preparation method comprises the following steps: S1, preparing a nickel-plated copper core; s2, preparing a heat insulation layer; s3, a composite insulating layer is prepared, the composite insulating layer is composed of a first insulating layer, a second insulating layer and a third insulating layer from inside to outside, the first insulating layer is a fluorinated ethylene propylene layer, the second insulating layer is a polyimide / fluorinated ethylene propylene composite layer, and the third insulating layer is a polyether-ether-ketone layer; s4, preparing a shielding layer; and S5, preparing a protective layer. The invention provides the preparation method of the tinned copper core fluorinated ethylene propylene insulated cable for aerospace, the insulated cable prepared by the preparation method has high performance and high reliability in an extreme aerospace environment, and all key requirements of electrical performance, radiation resistance, mechanical strength and wear resistance are comprehensively met.

The invention discloses a flame-retardant flat flexible high-current cable and a preparation method thereof, and relates to the technical field of cables. The cable comprises a flat conductor, an insulating layer, a shielding layer, a reinforcing layer and a sheath layer, the insulating layer contains 85-90 parts of low-density polyethylene, 1.2-1.5 parts of dicumyl peroxide, 12-15 parts of modified aluminum hydroxide and the like; and the sheath layer contains 42-50 parts of modified chlorinated polyethylene, 28-34 parts of modified aluminum hydroxide and the like. The modified chlorinated polyethylene is prepared through a three-step extrusion reaction, and the modified aluminum hydroxide is subjected to coupling agent treatment, coating modification and carbon nanotube composite modification. The flame-retardant flat flexible large-current cable has prominent advantages, an efficient flame-retardant system is constructed by modified aluminum hydroxide and antimony trioxide, and the V-0 level requirement of UL94 can be met; the flat structure is combined with the modified chlorinated polyethylene, so that the flexibility is excellent and the temperature-resistant range is wide. The design of the insulating layer and the shielding layer ensures excellent electrical performance, segmented temperature control and accurate parameter regulation and control are performed in preparation, stable product quality is ensured, and the device can adapt to a large-current application scene.

The invention relates to an insulating material, in particular to a nano composite insulating material, an insulated cable and an insulation defect repairing robot. The nano composite insulating material comprises core-shell particles, modified montmorillonite and crosslinked polyethylene, wherein each core-shell particle is provided with a core layer and a shell layer. The insulating layer of the insulated cable is made of the nano-composite insulating material. The insulation defect repairing robot can utilize the insulation defect repairing material to repair the crack defect of the insulation layer of the related cable. The material can automatically repair cracks under the action of an electric field and a thermal field, repeated repair for more than five times is achieved, micro defects smaller than or equal to 100 microns can be automatically repaired in the cable operation process, 90% of unplanned power failure faults are reduced, and the whole life cycle fault cost is reduced by 60%.

The invention discloses a preparation method and application of a high-thermal-conductivity polyimide-based paint film for a transformer winding, and relates to a preparation method and application of a polyimide-based paint film. The invention aims to solve the problem of poor heat-conducting property of the existing polyimide dielectric material. The method comprises the following steps: 1, preparing boron nitride nanosheet powder; 2, modifying the surface of the boron nitride nanosheet powder; 3, adding diamine and the boron nitride nanosheet subjected to surface modification into an aprotic polar solvent; 4, adding dianhydride; and 5, carrying out gradient heating to carry out imidization. The heat conductivity coefficient of the high-heat-conductivity polyimide-based paint film for the transformer winding reaches 0.35 W / (m.K) and is improved by 183% compared with that of a pure polyimide material, and meanwhile the high-heat-conductivity polyimide-based paint film has high insulation performance and is used for preparing high-heat-conductivity and high-insulation electrical insulation devices; the electrical insulation device comprises but is not limited to a high-power density motor, a transformer enameled wire and a high-frequency power transformer.

The invention relates to the technical field of cable manufacturing, and discloses a heat preservation frost crack prevention cable which comprises a conductor, an insulating layer and a double-layer co-extrusion functional sheath wrapping the outer side of the insulating layer, and the sheath is composed of a cold-resistant stable layer and a water stop gate layer which are arranged in sequence; nano silicon nitride dispersion liquid is added into the cold-resistant stable layer, polytetrafluoroethylene micro-powder is added into the water stop gate layer, and the nano silicon nitride dispersion liquid and the polytetrafluoroethylene micro-powder form a double protection system of physical blocking and structural supporting, so that interlayer bonding force is strengthened, interlayer gaps are reduced, and a moisture invasion path is blocked. The preparation method comprises the steps of raw material pretreatment, conductor cleaning and drying, insulating layer extrusion, plasma activation, double-layer co-extrusion and finished product drying. The cable solves the problem that a multi-layer sheath of an existing cable is prone to frost heaving cracking due to water infiltration, the frost heaving damage resistance is remarkably improved, the cable is suitable for the high-cold and high-humidity environment, and stable power transmission is guaranteed.

The invention discloses an anti-aging high-strength middle-high voltage cable and a preparation process thereof, and relates to the technical field of cable manufacturing. The cable sequentially comprises a conductor core, an inner shielding layer, a graphene heat conduction transition layer, an insulating layer, an outer shielding layer, a buffer layer, an armor layer and an outer sheath from inside to outside, and is technically characterized in that the conductor core adopts a copper core and composite modified carbon fiber reinforcement layer structure, and the armor layer adopts a galvanized steel wire and synergistic modified aramid fiber hybrid structure; and a graphene heat conduction transition layer is arranged between the insulating layer and the shielding layer. According to the preparation technology, through optimization of parameters of working procedures such as conductor twisting, material modification and multi-layer synchronous forming, tight combination of all structural layers is achieved.

The invention relates to a high-temperature-resistant and radiation-resistant armored coaxial radio frequency cable, which comprises a copper core, a first stainless steel tube, a silicon dioxide micro powder layer, a second stainless steel tube, a copper tube and an outer shielding protection tube which are sequentially arranged from inside to outside, the silicon dioxide micro powder layer is filled in a gap between the first stainless steel tube and the second stainless steel tube, the copper tube wraps the second stainless steel tube, and the outer shielding protection tube wraps the copper tube. The armored coaxial radio frequency cable is small in outer diameter, has good radiation resistance, high temperature resistance and high signal transmission stability, and can meet the insulation requirements of high-temperature scenes such as nuclear power and the like.

The application discloses a cable insulation extrusion equipment and relates to the field of cable extruders, which comprises an extruder and an extrusion die, and one side of the extruder is provided with a cooling system, the cooling system comprises multiple groups of water tanks, multiple groups of coils and multiple groups of cooling components, one side of the first water tank is provided with a water inlet pipe, one side of the fifth water tank is provided with a water outlet pipe, a circulating system is connected between the water outlet pipe and the water inlet pipe, the water inlet pipe, the water outlet pipe and the multiple groups of coils are connected through the setting of water supply hoses, and the end portions of the water inlet pipe, the water outlet pipe and the multiple groups of coils are connected with the cooling components through the setting of shunt joints and water distribution hoses. The multiple groups of water tanks, the multiple groups of heat exchange coils and the multiple groups of cooling components are arranged, so that the temperature of circulating water is gradually increased in a gradient, the insulation layer of the cable is cooled by the circulating water with more uniform temperature difference distribution, and the emergence of internal stress of the cable insulation layer can be reduced.

The utility model discloses a high-performance high-temperature-resistant oil-stain-resistant anti-interference medium-voltage power cable, and the power cable comprises a cable core which is formed by twisting a plurality of insulated shielding wire cores. A gap of the cable core is filled with thermoplastic polyurethane elastomer rubber; the cable core is wrapped by a superconducting silicon carbide fiber tape shielding wrapping layer, and the superconducting silicon carbide fiber tape shielding wrapping layer is wrapped by an LCP high-molecular liquid crystal polymer high-temperature-resistant fireproof layer in an extruded mode. A graphene aerogel layer is extruded outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer, a polysulfonamide fiber braid layer is lapped outside the graphene aerogel layer, a polyphenylene sulfide fiber tape is coated outside the polysulfonamide fiber braid layer through a semi-conductive adhesive, an armor layer is arranged outside the polyphenylene sulfide fiber tape, and the armor layer is wrapped outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer. And a hydrogenated butadiene-acrylonitrile rubber outer sheath is extruded outside the armor layer. According to the utility model, normal operation of a line can be ensured in a complex and severe environment for a long time, and the service life of the cable is greatly prolonged.

The corrosion-resistant high-temperature-resistant anti-interference sensor cable comprises a conductor layer, an insulating layer, a shielding layer and an outer sheath layer which are sequentially arranged from inside to outside, the conductor layer is a copper conductor of which the surface is coated with a nano-plating layer, the insulating layer is of a multi-layer insulating structure formed by wrapping PTFE film strips, the lap joint rate of each layer of PTFE film strip is 30-50%, and the lap joint rate of each layer of PTFE film strip is 30-50%. The shielding layer comprises a double-shielding structure formed by longitudinally wrapping a graphene shielding tape and a copper wire braid layer, and the outer sheath layer is a modified TPU elastomer. The invention further discloses a production method of the corrosion-resistant, high-temperature-resistant and anti-interference sensor cable. According to the corrosion-resistant, high-temperature-resistant and anti-interference sensor cable and the production method thereof provided by the invention, the material and the process of the sensor cable are improved, so that the comprehensive upgrading of the cable in the aspects of high temperature resistance, corrosion resistance, signal stability and the like is realized, and the normal use of the sensor cable in a smelting plant is met.

The invention discloses a high-flexibility multifunctional cable and a manufacturing process and application thereof, and relates to the technical field of communication cables.The high-flexibility multifunctional cable comprises at least one conductor unit, and each conductor unit comprises a conductive wire core formed by twisting a plurality of metal conductors and a first inner insulating layer wrapping the exterior of the conductive wire core; the functional unit and the conductor unit are arranged in a bundling mode, the functional unit comprises a functional core body, a second inner insulating layer and a lapped inner shielding layer, the functional core body is wrapped with the second inner insulating layer, and after the conductor unit and the functional unit are combined, the conductor unit and the functional unit are sequentially wrapped with an outer shielding layer, a buffer layer, an armor layer and an outer sleeve layer from inside to outside. According to the invention, application scenes in main connecting pieces such as electric power communication composite power supply / transmission umbilical cords, aerospace cabin-out system umbilical cords, industrial robot automatic mechanical arms and the like can be met.

The invention relates to the technical field of cable preparation, in particular to a superconducting semi-rigid cable made of high-purity aluminum and a preparation method thereof.The method comprises the steps that the high-purity aluminum is adopted as an inner conductor, and the inner conductor is preprocessed; coating the surface of the pretreated inner conductor with a PTFE mixture by using a pushing machine at normal temperature to obtain a normal-temperature pushing core wire; the qualified normal-temperature pushing core wire is wound on a cable reel and then placed in a vacuum high-temperature furnace to be subjected to vacuum sintering so as to obtain an inner conductor wrapped with an insulating layer; and the inner conductor wrapped with the insulating layer penetrates into the processed pure aluminum outer conductor tube, and the outer conductor is wrapped with PTFE to form an outer protective sleeve. According to the invention, the performance stability of the superconducting semi-rigid cable preparation can be improved.

The invention discloses a prefabricated branch fireproof cable with a copper metal shell and a preparation method of the prefabricated branch fireproof cable. The prefabricated branch fireproof cable comprises a copper metal main shell, the bottom of the copper metal main shell is communicated with a copper metal sub-shell, a main cable is installed in the copper metal main shell, and a branch cable is installed in the copper metal sub-shell; the main cable and the branch cable both adopt copper core conductors, and copper has high conductivity, so that resistance in a current transmission process can be reduced, electric energy loss can be reduced, electric energy transmission efficiency can be improved, and stable and efficient transmission of electric power to each electric device can be ensured; the nanoscale magnesium oxide insulation powder filled in the copper metal main shell and the copper metal branch shell has excellent insulation performance, can effectively isolate electrical connection between the main cable and the branch cable and the external environment and between the main cable and the branch cable and other conductors, prevents electric leakage and short circuit accidents, and improves the electrical safety of a cable system.

The mica tape wrapping machine comprises a base, a winding assembly and a conveying assembly are fixedly arranged at the upper end of the base, the winding assembly and the conveying assembly are matched to be used for conveying cables, a supporting plate is fixedly arranged at the upper end of the base, and a rotating ring is arranged on the side, close to the conveying assembly, of the supporting plate; a rotating part used for driving the rotating ring to rotate is arranged on one side of the supporting plate, two connecting blocks are arranged on the side, away from the supporting plate, of the rotating ring, a mica disc is arranged on one side of each connecting block, the mica tape is wound around the mica discs, connecting rods are fixedly arranged on the sides, away from the mica tape, of the connecting blocks, and the connecting rods are in sliding connection with the rotating ring. A fixing ring is arranged on the side, close to the conveying assembly, of the rotating ring, the connecting rod penetrates through the rotating ring to be rotationally connected with the fixing ring, an air cylinder is arranged on the side, away from the rotating ring, of the fixing ring, the output end of the air cylinder is fixedly connected with the fixing ring, a wire inlet is formed in the surface of the supporting plate, and a clamping piece is arranged at the wire inlet and used for clamping a cable. The device has the effect of improving the wrapping quality of the wrapping machine.

The invention relates to the technical field of special cables, and discloses a high and low temperature resistant composite insulating layer cable and a preparation method thereof.The cable comprises a conductor core and a composite insulating layer wrapping the conductor core, and the composite insulating layer comprises a high temperature resistant heat conduction core layer and a low temperature resistant elastic layer; the high-temperature-resistant heat-conducting core layer is prepared from the following raw material: polyamide acid; hexagonal boron nitride; alpha-phase silicon carbide; the preparation method comprises the following steps: adding gamma-amino propyl triethoxy silane; nano barium titanate; the low-temperature-resistant elastic layer is prepared from the following raw materials: vinyl terminated polydimethylsiloxane; performing hydrophobic treatment on fumed silica; a Karstedt catalyst; a hydrogen-containing silicone oil crosslinking agent; the average particle size D50 of the 1-ethynyl-1-cyclohexanol and the alpha-phase silicon carbide is 0.5 to 2 mu m. According to the invention, by adopting a microwave selective heating and interlayer heat conduction mechanism, efficient and high-quality integrated curing of the composite insulating layer is realized.

The invention provides an insulated wire and a preparation method thereof, and the preparation method comprises the following steps: S100, carrying out the drawing processing of a wire, and obtaining a bare wire; and S200, applying an insulating material to at least part of the surface of the bare conductor to obtain an insulated conductor. The bare conductor is processed through the drawing process, the purpose is to adjust the diameter of the bare conductor to the required specification, the mechanical property and the surface state of metal can be improved through selection of the drawing process, and compared with a bare conductor obtained through a traditional extrusion process and a traditional drawing process, the size of the bare conductor obtained through the drawing process is more stable.

The invention discloses a cable with a co-extrusion self-foaming ceramic fireproof layer and a preparation method of the cable, and belongs to the technical field of polyolefin cables. The cable comprises a conductor, an insulating layer and a fireproof layer from inside to outside, comprising the following raw materials: 40-60 parts of an ethylene-vinyl acetate copolymer, 20-40 parts of a polyolefin elastomer, 20-30 parts of a ceramic precursor filler, 5-10 parts of a compatilizer, 5-10 parts of a cosolvent, 3-5 parts of a flexibilizer, 2-4 parts of a main foaming agent, 1-2 parts of an auxiliary foaming agent, 1-3 parts of a lubricant and 0.5-1.5 parts of an antioxidant. The compatilizer is siloxane containing sulfydryl and phosphaphenanthrene groups, and the flexibilizer is silane coupling agent modified quartz fibers containing double bonds. In a matrix of the ethylene-vinyl acetate copolymer and the polyolefin elastomer, the compatilizer and the flexibilizer are added, so that the fireproof layer is endowed with better impact resistance and flame retardance.