3414results about "Insulating conductors/cables" patented technology

The invention relates to the technical field of cross-linked polyethylene cables, in particular to a mining cross-linked polyethylene insulated armored self-repairing cable and a manufacturing method thereof.The mining cross-linked polyethylene insulated armored self-repairing cable comprises a center conductor unit, a cross-linked polyethylene insulating layer, a shielding layer and an armored layer sequentially wrap the outer side of the center conductor unit from inside to outside, and an outer sheath layer is extruded on the outer side of the armored layer; the shielding layer comprises a semi-conductive shielding layer wrapping the outer side of the cross-linked polyethylene insulating layer, and the outer side of the semi-conductive shielding layer is wrapped with a copper strip shielding layer. By arranging the composite conductor structure in the central conductor unit and cooperating with the graphene heat dissipation filaments and the paraffin heat absorption and heat dissipation layer, the heat dissipation performance of the cable is improved, the temperature of the cable during operation is effectively reduced, faults caused by overheating are reduced, and the service life of the cable is prolonged; the armor layer and the copper strip shielding layer realize multipoint equipotential grounding through a sectional conductive adhesive tape, electromagnetic interference can be effectively shielded, and fault current diffusion is limited.

The invention relates to the technical field of cable preparation, in particular to an extruded insulation low-voltage power cable and a preparation method thereof.The preparation method comprises the steps that metal wires are twisted into a conductor according to preset twisting parameters, and the conductor is preprocessed; extruding an insulating layer on the surface of the pretreated conductor by using a screw extruder to obtain an insulated wire core; monitoring the diameter of the insulated wire core in real time by using a laser diameter measuring instrument, and determining the fluctuation characteristic type of the diameter of the wire core under a first preset condition; obtaining the eccentricity of the insulating layer and the void ratio between the insulating layer and the conductor; judging the qualification of the extrusion process according to the extrusion comprehensive quality index; under the condition that the extrusion process is unqualified, the qualification of the extrusion process is secondarily judged according to the insulation performance evaluation value; under the condition that the extrusion process is judged to be unqualified for the second time, an adjustment strategy of the extrusion process is determined; and after the insulated wire cores qualified in the extrusion process are twisted into a cable, an outer protective sleeve is extruded. The production efficiency and the product stability of the cable are improved.

The invention relates to the technical field of silica gel cables, and discloses a silica gel cable with high reliability and high flexibility and a process thereof, and the silica gel cable comprises a conductor layer which is formed by hierarchically twisting a plurality of tinned copper wires with the diameter of 0.05-0.10 mm, and the twisting helical angle gradually changes from 25 degrees in the inner layer to 55 degrees in the outer layer; the insulating layer coats the conductor layer and comprises a silica gel material, a hydrogen-containing silicone oil cross-linking agent and a plasticizer, microcapsules with the particle size of 20-50 microns are dispersed in the silica gel material, a shell layer of each microcapsule is polyurethane, and a core layer of each microcapsule is a siloxane repairing agent containing a platinum catalyst; and a sheath layer. A hydrogen-containing silicone oil cross-linking agent in the insulating layer enables molecular chains to be cross-linked to form a net structure, the physical and chemical stability is enhanced, microcapsules are matched to endow a self-repairing function, a repairing agent is released when the cable is damaged, the self-repairing performance of the insulating layer is further guaranteed, damage is filled through a cross-linking reaction, insulation is recovered, the reliability of the cable is remarkably improved, and the service life of the cable is remarkably prolonged.

The invention relates to the technical field of radio frequency coaxial cable manufacturing, in particular to a wrapping method and system for manufacturing a radio frequency coaxial cable, and the method comprises the steps: controlling a take-up frame to pull a to-be-wrapped body made of an inner conductor and an insulating layer to an initial wrapping position at a constant speed; starting wrapping equipment to be matched with the take-up frame to wind a metal belt in the wrapping equipment onto the to-be-wrapped body according to a preset wrapping angle from the initial wrapping position so as to carry out wrapping test on the to-be-wrapped body; collecting the diameter of the to-be-wrapped body wound with the metal belt in the wrapping test; determining the surface wrapping state of the to-be-wrapped body according to the diameter; and determining a wrapping processing mode based on the surface wrapping state, and performing actual wrapping on the to-be-wrapped body according to the wrapping processing mode to form an outer conductor layer. According to the invention, signals are prevented from leaking between the metal tape and the to-be-lapped body, and the signal transmission efficiency is improved.

An apparatus for the extrusion of a solid wire into a resin or paste is disclosed. The apparatus consists of two main parts including an adapter for constraining the wire until mixing with the resin or paste (‘wire injector’), and a motor-driven gear system that feeds the wire into the injector (‘wire extruder’). With this system, a bare wire can be extruded allowing for the creation of lead-in / lead-out sections, or for use with a resin or paste without an inherent curing, drying, or solidifying mechanism. Additionally, this apparatus allows for the extrusion of small (30-40 AWG) wires, enabling unique applications such as the injection of a resistive wire where smaller diameter wires are advantageous for minimized electrical or thermal overhead.

The invention discloses a crosslinked polyethylene reinforced high-strength insulating aerial cable, and belongs to the technical field of crosslinked polyethylene cable materials.The crosslinked polyethylene reinforced high-strength insulating aerial cable is prepared by the steps that hydroxyl is introduced to nano boron nitride powder, then amino is grafted through KH-550, nano alpha-Al2O3 powder is modified through gamma-glycidyl ether oxypropyl trimethoxy silane, and the cross-linked polyethylene reinforced high-strength insulating aerial cable is obtained; the preparation method comprises the following steps: preparing low-density polyethylene, compounding the low-density polyethylene with aminated nano boron nitride powder to form nano composite powder, improving the interface bonding force between the low-density polyethylene and the nano composite powder, carrying out melt blending on the low-density polyethylene and the nano composite powder to improve the dispersity of the nano composite powder in the low-density polyethylene, and carrying out nucleophilic acyl substitution reaction to obtain a fluorine-containing modified monomer. The nano boron nitride powder and the nano alpha-Al2O3 powder are subjected to a cross-linking reaction under the initiation action of an initiator and then coat the exterior of the thermal insulation layer, and the nano boron nitride powder and the nano alpha-Al2O3 powder are bridged through siloxane bonds to form a three-dimensional heat-conducting network, so that the heat resistance of the outer insulating layer is improved.

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 provides a continuous extrusion optimization method and device for a high-pressure polypropylene insulated cable, and relates to the technical field of polypropylene, and the method comprises the following steps: accessing an extruder system, and reading equipment information, extrusion demand information and raw material information of an extruder; performing control optimization of the extruder, and establishing calibration control parameters; controlling the extruder to perform molding control of the high-pressure polypropylene insulated cable; a temperature sensing network is laid, and first temperature optimization feedback is generated; carrying out extrusion pressure deviation analysis on the extruder, and if an extrusion pressure deviation value meets a deviation threshold value, establishing second temperature optimization feedback; and carrying out continuous extrusion optimization. The technical problem that in the prior art, due to low temperature control precision and large pressure fluctuation, the product quality of the high-pressure polypropylene insulated cable is unstable is solved, precise control and optimization of the continuous extrusion process of the high-pressure polypropylene insulated cable are achieved, and the product quality of the high-pressure polypropylene insulated cable is improved.

The invention discloses a temperature-resistant and wear-resistant three-layer insulated wire and a preparation method thereof, and relates to the technical field of cables. The preparation method comprises the following steps: extruding the inner layer material on the surface of the conductor material to form the inner insulating layer, extruding the modified silicone rubber on the surface of the inner insulating layer to form the middle layer, extruding the outer layer material on the surface of the middle layer to form the outer insulating layer, and curing to obtain the high-temperature-resistant flame-retardant cable material. Wherein the inner-layer material is prepared from low-density polyethylene, an antioxidant 1010, insulating particles, a voltage stabilizer and the like; the modified silicone rubber is prepared from silicone rubber, a boron nitride compound, modified magnesium oxide and the like; the outer-layer material is prepared from the inner-layer material and a boron nitride compound. Due to the introduction of the components such as the insulating particles, the voltage stabilizer and the boron nitride compound, the high voltage resistance, the aging resistance, the wear resistance and the temperature resistance of the crosslinked polyethylene insulated power cable are effectively improved. Therefore, the method has a wide application prospect.

The invention provides a comprehensive shielding signal cable and a manufacturing method thereof.The comprehensive shielding signal cable comprises a cable core and a protective layer wrapping the cable core, and the protective layer sequentially comprises a composite shielding layer and an outer sheath layer from inside to outside; the composite shielding layer comprises an iron-based amorphous nanocrystalline alloy layer, a 3D woven mesh layer and a conductive polymer coating which are sequentially arranged on the outer side of the cable core from inside to outside; through the gradient composite structure of the iron-based amorphous nanocrystalline alloy layer (low-frequency magnetic shielding), the 3D woven mesh layer (medium-frequency electromagnetic shielding) and the conductive polymer coating (high-frequency electric field shielding), the full-band shielding effectiveness is realized for the first time, meanwhile, the return loss is greatly reduced, the electromagnetic transmission performance and reliability of the cable are improved, and the service life of the cable is prolonged. And the structural stability of the cable is improved.

The invention relates to the technical field of cable production, and particularly discloses a cable core coating forming device for civil cable production, which comprises a mounting frame, an extrusion assembly for extruding a coating material is arranged on the inner side of the mounting frame, an extrusion barrel is arranged at the bottom of the extrusion assembly, and a cable core penetrates into the extrusion barrel. The left side of the mounting rack is provided with a cooling assembly used for cooling a coating material, and the coating forming device is characterized by further comprising a pretreatment assembly arranged on the right part of the mounting rack, the pretreatment assembly is used for preheating a cable core and cleaning the surface of the cable core, and the pretreatment assembly comprises a frame arranged on the right part of the mounting rack; through cooperation of the structure, warm water generated after heat absorption can be used for preheating a cable core, energy loss during preheating is reduced, meanwhile, dust and impurities attached to the surface of the cable core can be removed through bristles, and the situation that dust affects bonding between the cable core and a coating material is reduced.

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 the technical field of cross-linked polyethylene cables, in particular to a reinforced cross-linked polyethylene cable and an extrusion molding production method thereof.The reinforced cross-linked polyethylene cable comprises a center conductor, a center insulating layer, a shielding layer, an inner protective layer and an outer protective layer which are sequentially arranged from inside to outside; the central conductor is hollow, a central cavity of the central conductor is filled with an expansion heat dissipation strengthening layer, and a phase change heat dissipation layer is arranged between the central conductor and the central insulating layer; a flexible buffer isolation layer is arranged between the central insulating layer and the shielding layer, and the flexible buffer isolation layer wraps the outer side wall of the central insulating layer. The central conductor is of a hollow structure and is matched with the expansion heat dissipation strengthening layer and the phase change heat dissipation layer. A heat conduction channel formed by the expanded graphite and the nanofiber particles can rapidly dissipate heat, and the expanded heat dissipation reinforcing layer can also be automatically adjusted along with the temperature, thereby effectively preventing the central conductor from being overheated, prolonging the service life of the cable, and guaranteeing the stable operation of the cable in a high-load and high-temperature scene.

The invention discloses a polypropylene insulation high-voltage direct-current cable and a production method thereof, and relates to the technical field of cables, the polypropylene insulation high-voltage direct-current cable comprises an insulation layer, the insulation layer comprises an insulation part arranged between a conductor shielding layer and an insulation shielding layer, the insulation part is provided with a plurality of limiting holes communicated with the insulation shielding layer, the limiting holes are filled with phase change parts, and the phase change parts can transmit heat on the inner side of the insulation layer to the outer side of the insulation layer; and the cable can be converted between solid and liquid along with the temperature of the cable so as to fill an air gap between the insulating layer and the insulating shielding layer. The plurality of limiting holes are formed in the insulating part, the limiting holes are filled with the phase change parts capable of generating phase change at low temperature, and the temperature difference between the two sides of the insulating part is reduced through the heat conduction capability of the phase change parts, so that the problem of charge accumulation caused by the overlarge temperature difference between the two sides of the insulating part is avoided; and meanwhile, separation or air gaps between the insulating part and the insulating shielding layer are filled through phase change of the phase change part.

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 cables, and provides a flexible corrosion-resistant robot cable, which sequentially comprises a cable core, a shielding layer, an inner sheath layer and an outer sheath layer from inside to outside, and is characterized in that the cable core sequentially comprises a conductor and an insulating layer from inside to outside; the outer sheath layer comprises the following raw material components in parts by weight: 60-70 parts of high-density polyethylene, 15-25 parts of an ethylene-tetrafluoroethylene copolymer, 0.5-1.5 parts of an antioxidant, 1-3 parts of a plasticizer, 8-12 parts of a flame retardant, 10-20 parts of polyethylene glycol diacrylate composite barium sulfate and 1-2 parts of a lubricant; the polyethylene glycol diacrylate composite barium sulfate is prepared from the following raw materials: polyethylene glycol diacrylate, barium chloride and sodium sulfate. According to the technical scheme, the problem of poor corrosion resistance of the robot cable in the prior art is solved.

The present invention discloses a medium-voltage longitudinal water-blocking cable with a large cross-section and a preparation method thereof. The cable includes a conductor, a conductor shield, an insulation layer, a non-metallic insulation shield, a metal shielding layer, an inner sheath, and an outer sheath from the inside to the outside. The conductor is a multi-layer tightly compressed stranded wire conductor, and a water-blocking tape is filled and wrapped between each layer of the stranded wire conductor; the materials of the inner sheath and the outer sheath are both high-density polyethylene. The structure of the present invention is more compact, simple, and lightweight, thus solving the longitudinal water-blocking requirement of the stranded conductor, while having good anti-overload and large short-circuit current withstand capabilities, and being conducive to the vulcanization and sealing connection of matching connectors or joints.

The invention discloses a high-temperature-resistant insulated copper wire and a preparation method thereof, and belongs to the technical field of enameled insulated copper wires. The high-temperature-resistant insulated copper wire comprises a copper wire body (1) and a polysilazane mixed filler layer (2), and the polysilazane mixed filler layer (2) wraps the surface of the copper wire body (1) and is formed by mixing polysilazane and inorganic filler. According to the preparation method of the high-temperature-resistant insulated copper wire, firstly, polysilazane and inorganic filler are mixed, the surface of the copper wire body is coated with the mixed polysilazane and inorganic filler, and the organic-inorganic combined coated insulated copper wire has the advantages of being resistant to high temperature and high pressure, high in hardness and quality and uniform in coating and has high stability and reliability.

The invention provides a corrosion-resistant composite cable and a preparation method thereof, the corrosion-resistant composite cable comprises a signal unit, an optical cable unit and a protection unit, the signal unit and the optical cable unit are coated with the protection unit, the signal unit comprises a silver-plated copper conductor, an insulating layer, a shielding layer and a sheath layer, and the silver-plated copper conductor is coated with the insulating layer. The optical cable unit comprises an optical fiber, a buffer tube and a filler; the protection unit comprises an inner sheath, a tensile layer, an anti-corrosion layer and an outer sheath. The corrosion-resistant composite cable has good corrosion resistance, can effectively resist corrosion of various chemical substances, prolongs the service life of the cable, reduces the fault risk caused by corrosion, and improves the stability and reliability of power transmission or signal transmission; under severe environment conditions, such as high humidity, high salinity and high alkalinity, a normal working state can still be kept, continuous and stable support is provided for related equipment or systems, and normal operation of the equipment or systems is guaranteed.

The invention relates to the technical field of cable wrapping machines, and discloses a multi-sensor fused cable wrapping machine adaptive tension control device, which solves the problem that the existing cable wrapping machine is inconvenient for tension control, and comprises a cable wrapping machine body and a tension control mechanism, the cable wrapping machine body is composed of an open-type supporting disc, a double-gear driver, an open-type inner gear ring and a plurality of positioning grooved wheels, the tension control mechanism is connected to the open-type inner gear ring, an output shaft of the tension control mechanism is provided with a wrapping tape discharging roll, the side edge of one end of the open-type supporting disc is provided with an adjustable supporting assembly, and the adjustable supporting assembly is connected with the open-type inner gear ring. A first rotating speed sensor is arranged on one side of the adjustable supporting assembly, a supporting frame is arranged on the side edge of one end of the open type inner gear ring, a tension sensor, a laser displacement sensor and a visual camera are arranged on the supporting frame, and the tension control mechanism is composed of a shell, a tension adjusting assembly, a damping disc, a rotating shaft, a second rotating speed sensor and a controller. Through the device, self-adaptive tension control can be realized.

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.

Provided is an insulated electric wire including a conductor and a fluororesin layer containing a melt-fabricable fluororesin that is formed on the conductor, in which a peel strength measured by peeling the fluororesin layer from the conductor is 0.30 N / mm or more.

The invention provides a wire and cable and a production and processing technology thereof, and belongs to the technical field of wires and cables, the wire and cable specifically comprises a plurality of wires, an insulating layer and a protective layer, the two ends of the plurality of wires are aligned and gathered together, the insulating layer wraps the wires, the protective layer wraps the insulating layer, and the protective layer wraps the insulating layer. The insulating layer is made of supercritical foaming materials, and the protective layer is made of light high-strength polymers. Through the processing scheme provided by the invention, the laying efficiency of the wires and cables is improved.

The invention provides a branching tool for enameled wire production. The branching tool aims at overcoming the defects in the winding roller fixing process, the wire inlet angle adjusting process, the tensioning force control process and the branching guiding process in the prior art. The tool comprises a bottom plate, a take-up roller, a linkage clamping mechanism, a wire inlet angle adjusting mechanism, a wire loosening preventing mechanism and a wire inlet guiding mechanism. The double threaded rods are matched with the moving blocks, so that the take-up rollers of different specifications can be quickly mounted and dismounted, and the production efficiency is remarkably improved; a fluted disc, a lead screw and a mobile control motor are arranged, so that the wire inlet angle can be accurately adjusted, non-uniform winding of enameled wires is avoided, and the winding quality is ensured; the anti-loosening mechanism is combined with a pushing cylinder and a spring for adjustment, so that the tensioning force can be adjusted, the loosening of the enameled wire is avoided, and the compactness and the stability in the winding process are ensured; the tool can obviously improve the efficiency and quality in the enameled wire production process, meet the requirements of different specifications, and adapt to the efficient linkage adjustment requirement of a modern production line.

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 relates to a method and a system for manufacturing a nano modified polyethylene electronic wire in the field of intelligent manufacturing equipment industry. The method comprises the following steps of: extracting temperature fluctuation characteristics from temperature distribution in a plasticizing process, dynamically adjusting parameters of a cooling system by adopting a fuzzy control algorithm aiming at the fluctuation characteristics, and determining temperature consistency in a forming stage; temperature consistency data in the forming stage are obtained, a preset wire diameter tolerance threshold value is combined, if the temperature consistency is lower than the threshold value, the extrusion speed is adjusted through a servo motor, and the optimized wire diameter precision is obtained; melt rheological parameters are extracted from the wire diameter precision data, melt heat conduction uniformity is calculated by adopting a heat conduction model of a nano-modified polyethylene material, and the formation strength of an interface permeation network is determined; and rheological property data are obtained, a real-time cooperative control algorithm is adopted, coupling parameters of melt pressure and temperature are dynamically adjusted, and optimized extrusion molding process parameters are obtained.

The utility model discloses a multilayer composite enameled wire and a painting device thereof, the multilayer composite enameled wire comprises a copper wire core (1), the surface of the copper wire core (1) is provided with a primer layer (2), a middle layer (3) and a finishing coat layer (4) from inside to outside in sequence, the primer layer (2) is formed by compounding 12-14 high-toughness polyurethane layers with the same thickness, the thickness of the primer layer (2) is 12-28 microns, and the thickness of the finishing coat layer (4) is 12-28 microns. The middle layer (3) is formed by compounding 8-10 thermosetting resin layers with the same thickness, the thickness of the middle layer (3) is 8-20 microns, the finish paint layer (4) is formed by compounding 4-6 epoxy resin layers with the same thickness, and the thickness of the finish paint layer (4) is 4-12 microns; and the high-toughness polyurethane layer, the thermosetting resin layer and the epoxy resin layer are formed by independently baking. According to the utility model, the insulating property of the enameled wire can be improved, and the painting effect of the enameled wire is improved while the painting cost of the enameled wire is reduced.