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CN-122025224-A - High-strength cable overhead line and manufacturing method thereof

CN122025224ACN 122025224 ACN122025224 ACN 122025224ACN-122025224-A

Abstract

The invention discloses a high-strength cable overhead line, which comprises a composite reinforced core, a conductor layer, a shielding layer, an insulating layer and a sheath layer, and also discloses a manufacturing method of the high-strength cable overhead line, comprising the following preparation steps of S1, preparation of the composite reinforced core, stranding of the conductor layer, S2, synchronous coextrusion of three layers of integrated layers, S4, crosslinking and solidification, S5 and post-treatment, wherein the composite reinforced core is formed by adopting a carbon fiber core and a TC4 titanium alloy wire winding layer, and is matched with a modified epoxy resin adhesive reinforced interface combination containing nano aluminum oxide, the tensile strength is greatly improved compared with that of a traditional steel core aluminum stranded wire, and the titanium alloy and the modified adhesive form a double anti-corrosion barrier, so that the high-strength cable overhead line can resist severe environments such as coastal salt fog, industrial pollution and the like, and adapt to long-term service requirements of complex environments.

Inventors

  • ZHANG ZIZHAO
  • WANG HONGNA
  • HAO FEI
  • LI SHAOYONG

Assignees

  • 铭越电缆有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (9)

  1. 1. The high-strength cable overhead line is characterized by sequentially comprising a composite reinforced core (1), a conductor layer (2), a shielding layer (3), an insulating layer (4) and a sheath (5) from inside to outside, wherein the composite reinforced core (1) is of a composite structure of a carbon fiber core and a titanium alloy wire winding layer, the carbon fiber core is a PAN-based carbon fiber bundle, the titanium alloy wire winding layer is formed by alternately winding TC4 titanium alloy wires on the surface of the carbon fiber core at 45 degrees, and the carbon fiber core is bonded by a modified epoxy resin adhesive, and 5-8wt% of nano alumina particles are added into the adhesive; The insulation layer (4) is made of modified crosslinked polyethylene material, 8-12wt% of modified nano zinc oxide filler, 0.5-1.0wt% of ultraviolet absorber and 3-5wt% of composite reinforcing agent are added, the sheath layer (5) is made of modified polyvinyl chloride material, and comprises, by weight, 100 parts of PVC resin, 12-15 parts of modified polyethylene, 20-25 parts of modified silicon carbide filler, 3-4 parts of heat stabilizer, 8-10 parts of plasticizer, 0.8-1.2 parts of antioxidant and 4-6wt% of composite reinforcing agent.
  2. 2. The high-strength cable overhead line according to claim 1, wherein the modified nano zinc oxide filler is subjected to surface modification treatment of dehydroabietic acid, the modified silicon carbide filler is modified by a silane coupling agent, and the ultraviolet absorber is 2-benzotriazole.
  3. 3. The high-strength cable overhead line according to claim 1, wherein the composite reinforcing agent uses nano boron nitride and epoxy resin as core raw materials, and further comprises a silane coupling agent and an antioxidant, wherein the components are 15-20 parts by weight of nano boron nitride, 30-40 parts by weight of epoxy resin, 2-3 parts by weight of silane coupling agent and 10101-2 parts by weight of antioxidant; The composite reinforcer takes nano titanium dioxide and polyolefin elastomer as core raw materials, and also comprises an ultraviolet absorber and a mildew preventive, wherein the composite reinforcer comprises, by weight, 12-18 parts of nano titanium dioxide, 25-35 parts of polyolefin elastomer, 1.5-2.5 parts of ultraviolet absorber and 0.8-1.2 parts of mildew preventive.
  4. 4. A method of manufacturing a high strength cable overhead line according to any one of claims 1-3, comprising the steps of: S1, preparing a composite reinforced core (1), namely ultrasonically cleaning PAN-based carbon fiber bundles by acetone for 30-40min, and vacuum-drying at 120-150 ℃ for 2h, preparing a modified epoxy resin adhesive, mixing epoxy resin and a curing agent according to a mass ratio of 10:3, adding 5-8wt% of nano alumina particles, dispersing for 20-30min at a rotating speed of 1500-2000r/min, winding titanium alloy wires on the surface of the carbon fiber core at a 45-DEG crossing angle after the titanium alloy wires are dipped in the adhesive, controlling winding tension to be 5-8N, feeding the carbon fiber bundles into a curing furnace after winding is completed, curing at 100-120 ℃ for 1.5-2h, and cooling to obtain the composite reinforced core (1); S2, twisting the conductor layer (2), concentrically twisting the Al-Mg-Si aluminum alloy wires by using a multi-head twisting machine with the composite reinforced core (1) as the center, wherein the twisting speed is 80-100r/min, the pitch diameter ratio is controlled to be 12-16, and an online tension control system is adopted to ensure that the twisting structure is compact and uniform; S3, integrated three-layer synchronous coextrusion, namely, adopting a three-layer coextrusion unit, respectively adding a shielding layer (3) material, a modified XLPE insulating material containing a composite reinforcing agent and a modified PVC sheath material containing a composite reinforcing agent, controlling the extrusion temperature of the shielding layer (3) to be 160-170 ℃, the extrusion temperature of the insulating layer (4) to be 180-190 ℃ and the extrusion temperature of the sheath layer (5) to be 170-180 ℃, the screw rotating speed to be 30-40r/min and the traction speed to be 5-8m/min, and spraying a compatilizer with the thickness of 0.05-0.1mm on the interface of each layer; S4, crosslinking and solidifying, namely feeding the cable subjected to coextrusion molding into a continuous crosslinking furnace, crosslinking for 2-3 hours by adopting warm water at 90-95 ℃, and feeding the cable into a cooling water tank to cool to room temperature after crosslinking is finished; s5, post-treatment, namely trimming and deburring the surface of the cable sheath layer (5), performing performance detection, and rolling and packaging after the performance detection is qualified.
  5. 5. The method for manufacturing a high-strength cable overhead wire according to claim 4, wherein the composite reinforcing agent comprises the steps of: p1, pretreating raw materials, placing nano boron nitride in a vacuum drying oven, drying at 100-120 ℃ for 1.5-2h to remove surface moisture, and cooling to room temperature for standby; P2, premixing, namely putting the dried nano boron nitride and a silane coupling agent into a high-speed mixer, and mixing for 15-20min at the rotating speed of 800-1000r/min to enable the coupling agent to uniformly coat the surface of the nano boron nitride; p3, melting and compounding, namely adding epoxy resin into the mixed system, heating to 120-130 ℃, keeping the temperature and stirring for 30-40min, wherein the stirring speed is 500-600r/min, and forming a uniform dispersion system; P4, after-treatment, cooling to 80-90 ℃, adding antioxidant 1010, continuously stirring for 10-15min, then naturally cooling to room temperature, and crushing to the particle size of 50-100 mu m to obtain the composite reinforcing agent.
  6. 6. The method for manufacturing a high-strength cable overhead line according to claim 4, wherein the composite reinforcer comprises the following preparation steps: q1, pretreating raw materials, ultrasonically cleaning nano titanium dioxide with absolute ethyl alcohol for 20-30min to remove surface impurities, then vacuum drying for 2h at 110-130 ℃, and cooling for later use; q2, blending modification, namely placing the polyolefin elastomer into a double-screw extruder, heating to 160-170 ℃ to melt the polyolefin elastomer, adding the pretreated nano titanium dioxide and ultraviolet absorbent, controlling the screw rotating speed to 200-250r/min, and extruding and granulating; Q3, secondary compounding, namely putting the extruded particles into a high-speed mixer, adding the mildew inhibitor, and mixing for 10-15min at the rotating speed of 700-800r/min at the temperature of 80-90 ℃ to ensure that the mildew inhibitor is uniformly dispersed; q4, preparing a finished product, and crushing the mixed particles to a particle size of 80-120 mu m to obtain the composite strengthening agent.
  7. 7. The method of manufacturing a high-strength cable overhead line according to claim 4, wherein the compatibilizing agent used in the integrated coextrusion process is maleic anhydride grafted polyethylene.
  8. 8. The high-strength cable overhead line according to claim 1, wherein the conductor layer (2) is an Al-Mg-Si aluminum alloy wire, wherein the content of magnesium is 0.8-1.2wt%, the content of silicon is 0.5-0.8wt%, the balance is aluminum and unavoidable impurities, the conductivity of the wire is not less than 60% iacs, the tensile strength is not less than 280MPa, and the wire is formed in a concentric twisting manner with the composite reinforcing core (1) as the center, and the twisting pitch ratio is 12-16.
  9. 9. The high-strength cable overhead line according to claim 1, wherein the tensile strength of the carbon fiber core is more than or equal to 3500MPa, the diameter is 2-5mm, the wire diameter of the titanium alloy wire is 0.1-0.3mm, and the winding density is 8-12 turns per cm.

Description

High-strength cable overhead line and manufacturing method thereof Technical Field The invention relates to the technical field of cable overhead lines, in particular to a high-strength cable overhead line and a manufacturing method thereof. Background The overhead cable is a core component of the power transmission system, is widely applied to the scenes of urban power grids, rural power supply, complex terrain spanning and the like, and the performance of the overhead cable directly determines the power supply stability. The conventional overhead cable mostly adopts a steel-cored aluminum stranded wire structure, the galvanized steel core provides tensile strength, the aluminum stranded wire bears a conductive function, an obvious short plate exists in practical application, the steel core is easy to corrode in environments such as coastal salt fog, industrial pollution and the like, the tensile strength is suddenly reduced, the service life is only 15-20 years, a traditional insulating layer is made of single polyethylene or polyvinyl chloride material, the conventional overhead cable is poor in weather resistance and tracking resistance, is easy to age and crack under the alternating environment of ultraviolet light and high and low temperature for a long time to cause leakage risk, the conductor stranding and insulating layer extrusion are performed, the interface bonding degree is low, and interlayer stripping is easy to occur under the load of wind power and ice and snow. In the prior art, the improvement of insulation and jacket formula and the optimization of stranding process are adopted to improve the performance, but the problems of poor material compatibility, limited strength improvement, complex process, low efficiency and high cost exist, and the development of an overhead cable with ultrahigh tensile strength, corrosion resistance, weather resistance and structural stability and a high-efficiency manufacturing method are needed to adapt to long-term use requirements of complex environments. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a formula and a process of a high-strength cable overhead line. In order to achieve the above purpose, the present invention adopts the following technical scheme: The high-strength cable overhead line sequentially comprises a composite reinforced core, a conductor layer, a shielding layer, an insulating layer and a sheath layer from inside to outside, wherein the composite reinforced core is of a composite structure of a carbon fiber core and a titanium alloy wire winding layer, the carbon fiber core is a PAN-based carbon fiber bundle, the titanium alloy wire winding layer adopts TC4 titanium alloy wires to be wound on the surface of the carbon fiber core in a 45-degree crossed manner, and the carbon fiber core is combined through a modified epoxy resin adhesive, and 5-8wt% of nano alumina particles are added into the adhesive; The insulation layer is made of modified crosslinked polyethylene material, 8-12wt% of modified nano zinc oxide filler, 0.5-1.0wt% of ultraviolet absorber and 3-5wt% of composite reinforcing agent are added, the sheath layer is made of modified polyvinyl chloride material, and comprises, by weight, 100 parts of PVC resin, 12-15 parts of modified polyethylene, 20-25 parts of modified silicon carbide filler, 3-4 parts of heat stabilizer, 8-10 parts of plasticizer, 0.8-1.2 parts of antioxidant and 4-6wt% of composite reinforcing agent. Preferably, the modified nano zinc oxide filler is subjected to surface modification treatment by dehydroabietic acid, the modified silicon carbide filler is modified by a silane coupling agent, and the ultraviolet absorbent is 2-benzotriazole. Preferably, the composite reinforcing agent takes nano boron nitride and epoxy resin as core raw materials, and further comprises a silane coupling agent and an antioxidant, wherein the components comprise, by weight, 15-20 parts of nano boron nitride, 30-40 parts of epoxy resin, 2-3 parts of silane coupling agent and 10101-2 parts of antioxidant; The composite reinforcer takes nano titanium dioxide and polyolefin elastomer as core raw materials, and also comprises an ultraviolet absorber and a mildew preventive, wherein the composite reinforcer comprises, by weight, 12-18 parts of nano titanium dioxide, 25-35 parts of polyolefin elastomer, 1.5-2.5 parts of ultraviolet absorber and 0.8-1.2 parts of mildew preventive. The manufacturing method of the high-strength cable overhead line comprises the following preparation steps: S1, preparing a composite reinforced core, namely ultrasonically cleaning PAN-based carbon fiber bundles by using acetone for 30-40min, and vacuum-drying at 120-150 ℃ for 2h, preparing a modified epoxy resin adhesive, mixing epoxy resin and a curing agent according to a mass ratio of 10:3, adding 5-8wt% of nano alumina particles, dispersing for 20-30min at a rotating speed of 1500-2000r/min, windin