1122 results about "Cross-linked polyethylene" 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 discloses a low-smoke halogen-free cross-linked polyethylene insulated power cable, and relates to the technical field of power cables, the low-smoke halogen-free cross-linked polyethylene insulated power cable comprises a central conductor, the outer side of the central conductor is tightly coated with a rubber insulation sleeve, and the outer sides of a plurality of rubber insulation sleeves are jointly coated with a limiting silicon rubber sleeve; the outer side of the limiting silicon rubber sleeve is evenly coated with axial supporting inner rings at equal intervals, the outer rings of the axial supporting inner rings are tightly coated with axial protection outer rings, the outer sides of the axial protection outer rings and the filling soft rubber sleeve are jointly coated with an isolation protection rubber sleeve, and the outer ring of the isolation protection rubber sleeve is tightly coated with an installation outer rubber sleeve. According to the cable, the situation that rain and snow are attached to the outer side of the cable, and consequently the overall weight of the cable is increased is effectively prevented, the transverse traction force of the connecting position of the ends of the cable during working is reduced, the fatigue aging rate of the connecting position of the cable is reduced, and the actual service life of the cable is prolonged.

The invention relates to the technical field of cross-linked polyethylene cable accessories, and discloses a cross-linked polyethylene insulated cable overhead installation device which comprises a wire supporting rod, a hoisting steel cable, a cross-linked polyethylene insulated cable and a driving assembly, the driving assembly comprises a steel cable clamping block and a cable clamping block, and a steel cable pulley and a cable pulley which are vertically symmetrical are arranged in the driving assembly; a pushing assembly is arranged at the top of the steel cable clamping block and comprises a supporting transverse plate, a first telescopic rod, a rectangular frame, an upper supporting rod and a lower supporting rod, and locking clamps are sleeved outside the supporting transverse plate, the first telescopic rod, the rectangular frame and the upper supporting rod. When the driving assembly is pulled, the roller encoder measures the distance and controls the distance; the pushing assembly drives step by step, the steel cable clamping blocks are fixed firstly, then the cable clamping blocks are pushed by the same distance and then fixed, the clamps are pulled in a matched mode to be tightened, the device achieves accurate control over the distance between the clamps and the looseness of the cables, the cables are prevented from being too loose and abraded or too tight and damaged, the water blocking function is protected, the line stability is improved, and the operation and maintenance cost is reduced.

The utility model discloses a pressure-resistant cross-linked polyethylene power cable which comprises an outer sheath, an armor layer, an oxygen isolation inner protection layer and a flame-retardant wrapping tape layer which are sequentially arranged from outside to inside, and a pressure-resistant cable core, a plurality of power cable cores and a plurality of interval units are arranged in the flame-retardant wrapping tape layer. According to the power cable, the oxygen isolation inner protection layer effectively prevents oxygen permeation and delays aging of the cable, and the flame-retardant belting layer improves the fireproof performance of the cable. The multiple surrounding plate bodies surround the pressure-resistant cable core, and the spacing plate bodies play a role in separating and fixing the power cable core, so that the pressure-resistant capability of the cable is improved, and the overall structure of the cable is more compact and stable. In addition, the insulating layer is made of the cross-linked polyethylene material, so that the cable has good insulating performance, short circuit can be effectively prevented, the safety and reliability of the cable are improved, and power transmission is stable and efficient.

The invention discloses a wear-resistant tensile power cable and a preparation method thereof, and relates to the technical field of power cables, the wear-resistant tensile power cable comprises a wire core, the interior of the wire core is a stranded wire structure formed by stranding a plurality of copper wires, the exterior of the wire core is coated with a crosslinked polyethylene insulating tube, and a centering assembly is fixedly installed on the outer surface of the wire core. According to the wear-resistant tensile power cable and the preparation method thereof, the hemp rope is filled in the special-shaped pipe for centering and stabilizing the whole structure, the silica gel coating is filled in the special-shaped pipe, an inner layer centering structure is formed after the coating is shaped, and the cable particles easy to flow are filled between the inner side surface of the special-shaped pipe and the special-shaped pipe. The cable particles improve the overall stability of the cable, and at the same time, when the outer layer protection structure is broken by tensile force, the inner layer centering structure is not damaged by tensile force, thereby solving the problem that the tight fixed connection between the outer layer protection structure and the inner layer centering structure of the cable easily causes the overall cable to be broken by tensile force and causes serious accidents.

A crosslinked polyethylene cable is widely applied to a modern power grid, but in the manufacturing and laying process, certain microdefects are inevitably caused in the cable, the cable is corroded by power frequency voltage and different substances in soil during operation, and the microdefects are eroded by water to gradually induce water branch defects. Some water branches grow along the direction of the electric field force and gradually derive into electric branches under the action of overvoltage, and finally the cable insulation layer is broken down. An existing microcapsule type self-repairing material is limited by a triggering mode, is single in function and harsh in triggering condition, cannot perform self-repairing on various defects such as mechanical damage, electric tree branches, water tree branches and micropores, and only can perform single-time repairing, namely, the problems that multiple-time repairing cannot be performed, the repairing efficiency is low and the like exist. Therefore, it is necessary to develop a microcapsule / crosslinked polyethylene composite insulating material with multiple and multiple self-repairing capabilities, and a method for fundamentally exploring and prolonging the service life of the insulating material is provided.

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 relates to the technical field of crosslinked polyethylene insulated cables, and provides a crosslinked polyethylene insulated cable with a temperature adjusting function, which comprises a cable section, a heat preservation layer, a connecting piece, a fixing piece, a temperature adjusting pipe and a temperature adjusting mechanism, and is characterized in that the cable section comprises a conductor, an insulating layer, an isolation sleeve and an outer sheath, and a filler is arranged between the isolation sleeve and the insulating layer; the insulating layer wraps the isolation sleeve, the connecting pieces are arranged at the two ends of the cable sections and used for electrically connecting the two cable sections, the fixing pieces are used for fixing the connecting pieces, the temperature adjusting pipe is arranged in the isolation sleeve, filling is arranged between the temperature adjusting pipe and the isolation sleeve, the insulating layer is of a hollow structure, and the temperature adjusting pipe is communicated with the insulating layer. The temperature adjusting mechanism is used for adjusting the temperature of gas input into the heat preservation layer and the temperature adjusting pipe. According to the technical scheme, the cable is used for solving the problems that in the prior art, the cable only depends on cable materials to resist temperature changes, temperature adjusting means are lacked, and the service life of the cable is shortened.

The invention discloses a 0.6 / 1kV cross-linked polyethylene cable and a preparation method thereof, and relates to the technical field of cross-linked polyethylene cables, the 0.6 / 1kV cross-linked polyethylene cable comprises a wire core, a cross-linked polyethylene bottom layer, a protective outer layer and a composite protective layer, and the composite protective layer is prepared by mixing expanded graphite and a thermal response hard generator; when the thermal response hard generating agent is heated and is at the heating reaction temperature, a solid hard object used for improving the hardness of the composite protection layer is generated, and after the expanded graphite is heated to expand and the thermal response hard generating agent is heated to generate the solid hard object, it can be guaranteed that the composite protection layer has the good hardness, and the service life of the composite protection layer is prolonged. When the composite protective layer is impacted in the heating process, the composite protective layer can still resist impact by using a solid hard object generated by heating, so that the situation that the impact resistance of the composite protective layer is seriously reduced after the expanded graphite is heated and expanded is avoided; therefore, the cross-linked polyethylene bottom layer and the wire cores in the cross-linked polyethylene bottom layer can still be well protected after the composite protection layer is impacted in the heating process.

The invention relates to the technical field of power cables, in particular to a heat-aging-resistant crosslinked polyethylene insulated power cable and a preparation method thereof. The cable comprises conductor wire cores, an insulating layer, a filling layer, a composite function layer, a steel tape armoring layer and a sheath layer from inside to outside. The insulating layer is composed of semi-conductive crosslinked polyethylene, silicone resin, nano montmorillonite and an HALS light stabilizer; the filling layer is composed of plasticized glass fabric, polyphenylene sulfide and rare earth oxide; the composite functional layer sequentially comprises a heat-conducting inner layer, a flame-retardant middle layer and an anti-UV outer layer from inside to outside; the sheath layer is composed of polyolefin, white carbon black, ceramic silicone rubber, a flame retardant, polyethylene wax and an initiator. According to the cable, cross-linked polyethylene and silicone resin are preferably selected as heat-resistant materials, heat conduction / flame retardance / UV resistance / armored multi-layer synergistic protection is achieved, the mechanical barrier performance is improved, meanwhile, damage of thermal stress to internal materials is reduced, comprehensive improvement of thermal aging resistance is achieved, and the cable is suitable for high-temperature, high-humidity and frequent thermal cycle harsh environments.

In some embodiments, a cable can include an electrically conductive inner core. A first insulation layer can be disposed about the inner core. An electrically conductive layer can be disposed about the first insulation layer. A second insulation layer can be disposed about the electrically conductive layer. A first polymer jacket can be disposed about the second insulation layer. The first polymer jacket can include a first layer of armor strength members disposed therein. A second polymer jacket can be disposed about the first polymer jacket. The second polymer jacket can include a second layer of armor strength members disposed therein. An outer polymer jacket can be disposed about the second polymer jacket. At least one of the first polymer jacket, the second polymer jacket, and the outer polymer jacket can be formed from an aliphatic polyketone polymer, an ethylene-propylene copolymer, a polyolefin elastomer, a polypropylene, or a cross-linkable polyethylene.

The invention discloses a weather-resistant flame-retardant crosslinked polyethylene insulating material, a cable material and a preparation method. The weather-resistant flame-retardant crosslinked polyethylene insulating material comprises the following components in parts by mass: 60-70 parts of linear low-density polyethylene (LLDPE), 20-25 parts of low-density polyethylene (LDPE) and 15-20 parts of a copolymerization mixture, the copolymerization mixture is prepared from a styrene-ethylene / butylene-styrene block copolymer (SEBS) and styrene-ethylene / butylene-styrene block copolymer grafted maleic anhydride (SEBS-g-MAH). The cable material disclosed by the invention not only can give consideration to the flame-retardant characteristic and light aging resistance of a cable insulating material, but also can inhibit the damage of moisture to the insulating material under an alternating electric field, reduce the moisture entering the insulating material in a natural environment, and improve the water tree resistance of the material.

The invention discloses an efficient heat dissipation type crosslinked polyethylene insulated cable, which comprises a cable core, an inner protective layer, a metal shielding layer, an outer protective layer, a heat conduction filling layer and heat dissipation mechanisms, and is characterized in that two adjacent heat dissipation mechanisms are connected through a hose; the heat dissipation mechanism comprises a main guide pipe, a partition plate, an air inlet pipe, an air outlet pipe and a radiator. The main conduit is arranged in the inner protective layer; the partition plate divides the interior of the main guide pipe into a front cavity and a rear cavity. The air inlet pipe is sleeved with the front cavity of the main guide pipe. The air outlet pipe is sleeved with the rear cavity of the main guide pipe. The plurality of radiators are arranged between the cable cores at the periphery of the main conduit; the radiator comprises a main radiating plate, a front flow guide plate and a rear flow guide plate which are all of a hollow structure. According to the cross-linked polyethylene insulated cable, the heat dissipation mechanism is arranged in the cross-linked polyethylene insulated cable, heat is efficiently and rapidly conducted to the outer edge of the cable from the middle of the cable under the cooperation of wind, rapid heat dissipation is conducted through the heat dissipation face, far larger than the middle of the cable, of the main heat dissipation plate, the heat dissipation speed is high, and the heat dissipation efficiency is high.

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 relates to the technical field of metal wires, in particular to a low-voltage aluminum wire and a preparation method thereof, the sectional area of the wire is 35 square millimeters, the wire comprises an aluminum alloy conductor and an insulating layer, the aluminum alloy conductor comprises the following chemical components: 0.7-0.9% of magnesium, 0.4-0.6% of silicon, 0.15-0.25% of copper, 0.08-0.12% of zirconium, 0.05-0.09% of scandium, 0.03-0.07% of silver, 0.01-0.03% of erbium, 0.02-0.04% of vanadium and the balance of aluminum, and the microstructure of the aluminum alloy conductor is in gradient distribution. The center is ultra-fine grains, a transition region contains a nano precipitated phase, the surface layer is of a high-density dislocation and nano precipitated phase synergistic reinforcement structure, the insulating layer is of a double-layer composite structure, the inner layer is a crosslinked polyethylene modified layer, the outer layer is an ethylene-tetrafluoroethylene copolymer modified layer, the electric conductivity is improved to 58% IACS or above, and the tensile strength is improved to 280 MPa or above.

The invention relates to the technical field of cross-linked polyethylene insulated cables, and provides a cross-linked polyethylene insulated cable with a protection structure, which comprises a conductor, an inner insulating layer, an outer insulating layer, an outer sheath, an armor layer and a protection structure, and is characterized in that the inner insulating layer wraps the conductor, and a filler is arranged between the outer insulating layer and the inner insulating layer; the armor layer wraps the outside of the outer insulation layer, the outer sheath wraps the outside of the armor layer, the protection structure is detachably arranged outside the outer sheath, the protection structure comprises an installation assembly, a protection plate and a sealing ring, the installation assembly is detachably installed outside the outer sheath, the protection plate is in a semi-ring shape, and the sealing ring is arranged on the outer sheath. The protection plate is connected to the outer portion of the mounting assembly through the buffer springs and the buffer rods, and the two sealing rings are connected to the two ends of the protection plate through the telescopic sleeves. According to the technical scheme, the problems that in the prior art, a cross-linked polyethylene insulated cable is poor in protection performance and prone to being damaged in the laying process are solved.

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 utility model relates to the technical field of submarine cable production, and discloses a water-tree-resistant cross-linked polyethylene insulated optical fiber composite wet-type submarine cable, which comprises a main body mechanism and an auxiliary mechanism, the auxiliary mechanism is positioned on the inner side of the main body mechanism, and the main body mechanism comprises a water-blocking conductor, a conductor shield and an insulating layer. According to the water-tree-resistant cross-linked polyethylene insulated optical fiber composite wet-type submarine cable and the production equipment, through installation of a main body mechanism, the elongation of copper monofilaments is controlled to be 30-35%, the resistivity is smaller than or equal to 0.017241 omega.mm / m, a layer of semi-conductive seawater-resistant water-blocking tape is longitudinally wrapped between every two layers of conductors, a layer of water-blocking yarn is bound outside the water-blocking tape, and the water-tree-resistant cross-linked polyethylene insulated optical fiber composite wet-type submarine cable is formed. The outer layer of the stranded conductor is wrapped by a layer of reverse semi-conductive water-blocking binding tape and a layer of semi-conductive tetoron tape, the water-blocking layer of the semi-conductive water-blocking binding tape faces the conductor, the overlapping positions of the two layers of semi-conductive tapes are not overlapped at the same position, the semi-conductive tapes are required to be flatly wrapped and uniformly overlapped, the overlapping rate is controlled to be 20-35%, and the insulating layer is made of an XLPE insulating material and has the thickness of 24.0 mm.

The invention relates to the technical field of electric power conductive parts, in particular to a busbar using a conductive extrusion molding material as a shield, which comprises the following steps: S1, selecting a high-voltage insulating conductive material; s2, raw material pretreatment quality detection; s3, carrying out extrusion molding on the high-voltage insulating layer; s4, extruding and coating the conductive shielding layer; s5, carrying out secondary extrusion molding on the double-layer insulation structure; s6, processing the cutting edge of the busbar; s7, bending and forming the busbar; s8, peeling and punching the busbar; and S9, packaging and quality assurance testing. The 70% high-voltage insulating layer (crosslinked polyethylene) is used for providing the excellent dielectric strength of at least 35 kV / mm, electric shock and short circuit accidents are effectively prevented, safe operation of a power system is ensured, the 30% high-purity copper or aluminum alloy conductive shielding layer achieves the electromagnetic shielding effectiveness larger than or equal to 80 dB, electromagnetic interference (EMI) is remarkably inhibited, and the service life of the cable is prolonged. The influence of electromagnetic noise on surrounding equipment is reduced, and the stability and reliability of the system are improved.

The present invention belongs to the technical field of cable insulation degradation degree detection, and specifically provides a 10 kV cross-linked polyethylene cable degradation degree assessment method, terminal and storage medium based on a multi-dimensional degradation coefficient, including: performing partial discharge test, leakage current test and broadband dielectric spectrum test on a target 10 kV cross-linked polyethylene cable, collecting partial discharge data, leakage current data and dielectric loss real part and dielectric loss imaginary part data of the cable at multiple frequencies; calculating a multi-dimensional degradation coefficient τ based on the collected partial discharge data, leakage current data, dielectric loss real part and dielectric loss imaginary part data; evaluating the insulation degradation degree of the target cable based on the multi-dimensional degradation coefficient τ. The present invention can accurately calculate the multi-dimensional degradation coefficient of the cable through the collection and analysis of multi-dimensional data, thereby accurately reflecting the insulation degradation of the cable, and helping to timely discover potential faults of the cable.

The invention relates to a cross-linked polyethylene insulation material and a preparation method and application thereof, and the cross-linked polyethylene insulation material comprises the following raw materials: low density polyethylene, an antioxidant, a cross-linking agent, a first scorch retarder and a second scorch retarder, the first anti-scorching agent comprises one or more of an olefin anti-scorching agent, an allyl substituted phenol anti-scorching agent and a thiocarbonate anti-scorching agent, the second anti-scorching agent comprises a free radical terminator, low-density polyethylene, an antioxidant and a cross-linking agent, and the first anti-scorching agent and the second anti-scorching agent are matched for use. The scorching phenomenon of the cross-linked polyethylene insulation material in the processing process and the using process can be reduced, the scorching resistance of the cross-linked polyethylene insulation material is improved, and the service life of the cable is prolonged.

The invention discloses a corrosion-resistant insulating aerial cable which sequentially comprises a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and an outer sheath from inside to outside. The conductor layer is an aluminum alloy stranded wire of which the surface is coated with an anti-oxidation coating; the insulating layer is made of crosslinked polyethylene doped with 3-5% of nano silicon dioxide; the corrosion-resistant layer is a fluoroplastic or polyurethane coating; and the outer sheath is polyvinyl chloride added with an antioxidant and an ultraviolet light absorber. The fluoroplastic coating is formed through electrostatic spraying, and the surface of the copper wire shielding layer is subjected to phosphating pretreatment; the doped nano material enhances the mechanical strength and ultraviolet resistance of the insulating layer; the spiral groove design accelerates drainage and reduces accumulated water corrosion.

The invention discloses a solar photovoltaic cable sheath material and a tear-resistant photovoltaic cable, and belongs to the field of photovoltaic cable manufacturing. The sheath material comprises the following components in parts by weight: 70-120 parts of ethylene propylene rubber, 10-13 parts of crosslinked polyethylene, 3-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of paraffin, 2-5 parts of an anti-aging agent RD, 8-12 parts of zinc borate, 150-200 parts of a reinforcing agent, 10-12 parts of high abrasion furnace black, 9-13 parts of tricresyl phosphate, 9-13 parts of red phosphorus, 0.5-1 part of an accelerant TMTD, 3-5 parts of DCP and 1-2 parts of HVA-2. The reinforcing agent composed of sodium silicate, ferric chloride and aluminum hydroxide is added into the sheath material, so that when the sheath material is damaged, sodium silicate and ferric chloride react under the influence of air moisture to generate colloidal silicic acid carrying ferric hydroxide and aluminum hydroxide, and the damaged part is filled with the colloidal silicic acid; and meanwhile, the aluminum hydroxide can promote the colloidal silicic acid to be dried, so that the damaged part is repaired, and the situation that the tear resistance of the cable is remarkably worsened due to damage is avoided.

The utility model relates to a submarine cable flexible joint forming die, which is used for insulating extrusion and crosslinking at the joint of conductors of two sections of cables, and comprises a forming device which is provided with a die cavity, the joint of the conductors of the two sections of cables is located in the die cavity, and the inner walls of the two ends of the forming device abut against the outer surfaces of the cables in a sealing manner; the feeding device is arranged at one end of the forming device, the feeding device is provided with a feeding channel, a connecting channel and an annular channel, and the connecting channel communicates with the feeding channel and the annular channel; the sealing device is arranged on the forming device and communicated to the mold cavity, and the sealing device can seal or open the mold cavity; the size of the end, communicated with the feeding channel, of the connecting channel is smaller than that of the end connected with the annular channel. Therefore, the crosslinked polyethylene can uniformly coat the outer side of the conductor joint in the extrusion process, the crosslinked polyethylene melt is ensured to be crosslinked and vulcanized in a sealed environment, the forming quality of the submarine cable flexible joint is ensured, and the crosslinking and vulcanization efficiency and quality are improved.

The invention relates to the technical field of cables, in particular to a 220kV crosslinked polyethylene ultrahigh-voltage cable and a preparation method thereof. The 220kV crosslinked polyethylene ultrahigh-voltage cable comprises a conductor, an inner semi-conductive shielding layer, a modified crosslinked polyethylene insulating layer, an outer semi-conductive shielding layer, a fireproof enhancement layer and a sheath, a crosslinked polyethylene insulating layer in a traditional 220kV crosslinked polyethylene ultrahigh-voltage cable is modified, and a fireproof reinforcing layer is introduced on the basis of the traditional 220kV crosslinked polyethylene ultrahigh-voltage cable; in the aspect of mechanical performance, the strength, the flexibility and the wear resistance are improved, frequent actions and complex environments of fire-fighting robots and movable fire-fighting equipment are adapted, in the aspect of heat stability, the heat resistance is enhanced, and normal work of emergency rescue equipment at high temperature is guaranteed; the sintered material forms a heat insulation barrier in a fire disaster to protect the emergency rescue lighting and communication equipment cable from being damaged by high temperature, and the flame retardant inhibits flame spreading and combustion to prevent the fire disaster from expanding through the cable.

The invention relates to the technical field of wires and cables, and discloses a fire-resistant cable based on an overhead photovoltaic system, a braided ring in a fire-resistant flame-retardant layer is formed by winding flame-retardant crosslinked polyethylene fibers, air circulation is guaranteed by virtue of a large number of pores among ropes, and when the fire-resistant cable is burnt by flame, high-temperature gas enters the space of the braided ring, and then the braided ring is sealed. On the other hand, the liquid drainage rod is pulled through contraction traction force, the piston disc is promoted to extrude the flame-retardant liquid in the storage sleeve, after the liquid is sprayed out through the liquid drainage holes, one part of the liquid directly acts on a flame area for fire extinguishing and flame retarding, and the flame-retardant effect is achieved. Most of the materials are adsorbed and retained by the porous structure of the braided ring, are gradually decomposed at a continuous high temperature to release flame-retardant gas, and react with braided ring fibers to form a liquid-state and solid-state composite heat-insulating layer to fill tiny pores which are still remained after shrinkage, so that the integrity of a cable circuit at the initial stage of a fire disaster is guaranteed.

The invention relates to the technical field of power cables, and provides a high-flame-retardant power cable which comprises a conductor, an insulating layer, a shielding layer and an outer sheath layer. The insulating layer is arranged outside the conductor, the shielding layer is arranged outside the insulating layer, and the outer sheath layer is arranged outside the shielding layer; the conductor is an aluminum alloy conductor; the insulating layer is a crosslinked polyethylene insulating layer; the outer sheath layer comprises the following components in parts by mass: 60-70 parts of polyethylene, 10-20 parts of polypropylene, 10-20 parts of an ethylene-vinyl acetate copolymer and 40-50 parts of a flame retardant, and the flame retardant comprises the following raw materials: aluminum hydroxide, aluminum oxide and a hydroxy anthraquinone compound in a ratio of 10: 1: (0.05-1). According to the technical scheme, the problems of low mechanical property and poor flame retardance of the power cable in the prior art are solved.

The invention relates to the technical field of crosslinked polyethylene insulated power cables, in particular to a flame-retardant and insulated low-voltage power cable and a preparation method and application thereof. The flame-retardant and insulating low-voltage power cable comprises the inner core layer, the filler layer, the belting layer, the lining layer, the metal armor layer and the outer sheath layer from inside to outside, and the multiple layers can effectively protect the inner core and endow the cable with better performance; in addition, low-density polyethylene, a furan modified polyethylene compatilizer, a reactive flame retardant, bismaleimide, dicumyl peroxide and an auxiliary are adopted to obtain the cross-linked polyethylene material for the cable outer sheath, and the cross-linked polyethylene material has excellent insulation, flame retardance, strength, toughness and repairing performance.

The invention relates to the technical field of cables, in particular to a cross-linked polyethylene insulated power cable for a humanoid robot, which comprises a plurality of groups of conductors, a heat insulation and heat conduction structure, a sheath, a heat dissipation structure and a power cable, and the insulating layer is arranged on the sheath and is in contact with the heat-insulating heat-conducting structure inside the sheath. The conductors are separated through the partition plates and the partition edge strips on the partition plates, and the situation that heat cannot be dissipated effectively due to the fact that the cable cores are attached together is avoided. By means of the heat conduction strips embedded in the separation edge strips and the heat conduction aluminum foil layers making contact with the heat conduction strips, heat generated by the conductors can be conducted outwards, and heat concentration in the cable is avoided. Through the heat dissipation structure which is arranged on the cable joint and is in contact with the heat-conducting aluminum foil layer, heat in the heat-conducting aluminum foil layer can be rapidly taken away through the cooling channel in the heat dissipation structure, so that the purpose of heat dissipation is achieved.

The invention discloses a cross-linked polyethylene insulated control cable, and relates to the technical field of cross-linked polyethylene insulated cables, the cross-linked polyethylene insulated control cable comprises an insulating shell, a notch is formed in the middle of the top surface of the insulating shell, a sealing ring and a protective sleeve are arranged in the middle of the left side and the right side of the insulating shell, and the protective sleeve is fixed on the inner wall of the sealing ring; the inner wall of the protective sleeve is provided with a tear-resistant filler, the inner wall of the tear-resistant filler is provided with a plurality of cross-linked polyethylene insulating layers, the inner walls of the cross-linked polyethylene insulating layers are provided with copper cores, the ends, close to each other, of the copper cores are fixedly connected, the insulating tape is wound on the outer walls of the copper cores, and the outer walls of the copper cores are fixedly connected with the cross-linked polyethylene insulating layers. The calcium chloride block in the top cover is conveniently replaced by a maintainer, so that the problem that the maintenance effect of the crosslinked polyethylene insulated control cable is poor due to the fact that the calcium chloride block is inconvenient to replace in the maintenance process of the crosslinked polyethylene insulated control cable is solved.