CN113284670B - Manufacturing method of aerial cable and product thereof - Google Patents
Manufacturing method of aerial cable and product thereof Download PDFInfo
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- CN113284670B CN113284670B CN202110462925.8A CN202110462925A CN113284670B CN 113284670 B CN113284670 B CN 113284670B CN 202110462925 A CN202110462925 A CN 202110462925A CN 113284670 B CN113284670 B CN 113284670B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/008—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing extensible conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
Abstract
The invention discloses a manufacturing method of an overhead cable and a product thereof, wherein the method comprises the following steps: producing an aluminum alloy rod; drawing a round aluminum alloy wire; aging; continuously pressing and twisting round aluminum alloy wires to form a molding wire; stress relief treatment and shielding and insulation coating; and continuously storing the wires and extruding the sheath to obtain the required overhead cable. The wire drawing speed of the round aluminum alloy wire is up to 20m/min, and the production efficiency is high; the round wire rolling forming wire device with the heating function is adopted to roll the forming wire, so that the pressing resistance is reduced, the round aluminum alloy wire is prevented from being broken during cold pressing, and the problem of resistance rise caused by work hardening during deformation of the aluminum alloy wire is solved; the twisting stress of the aluminum alloy molded line conductor can be reduced, so that the medium-voltage overhead insulated cable with the bending radius being as small as 10 times of the outer diameter of the cable can be obtained, the cable is convenient to install, and the safety and reliability of the operation of the cable are improved; the cable can be produced quickly and continuously, and the line changing and shutdown cost during production is reduced.
Description
Technical Field
The invention belongs to the technical field of overhead cables, and particularly relates to a manufacturing method of an overhead cable and a product thereof.
Background
In the distribution lines, areas such as forest zones, hills and riverways are still required to use a large amount of overhead insulated cables, at present, the overhead insulated cables with aluminum cores and steel-cored aluminum strand cores are most applied to the overhead insulated distribution lines in China, and the copper-cored overhead insulated cables are mostly used as down leads of transformer areas. 6201 aluminum alloy core overhead insulated cables are mostly adopted in overhead insulated power distribution systems of developed countries such as Europe and America, and 1120 aluminum alloy core overhead insulated cables are mostly adopted in overhead insulated power distribution systems of Australia. From 2010, a large amount of foreign advanced manufacturing equipment and manufacturing processes are introduced in China, and LHA1, LHA2 and LHA3 aluminum alloy materials are used in a power transmission system in advance. In an overhead insulated power distribution system, along with the implementation of JB/T13795-2020 Standard of Medium Strength aluminum alloy conductor overhead insulated Cable with rated Voltage of 20kV and below, the aluminum alloy core overhead insulated cable used for replacing the steel core aluminum twisted wire core overhead insulated cable is widely applied under meteorological conditions in most areas in China.
In the areas with strong wind, dense forest and complex terrain, the traditional steel core aluminum stranded wire core overhead insulated cable has poor wear resistance, corrosion resistance and fatigue resistance, is easy to have short circuit and disconnection faults in the application process, and is not energy-saving, and the high-strength aluminum alloy core overhead insulated cable has poor energy-saving effect due to large direct current resistance. At present, energy conservation and emission reduction are actively advocated, and low-carbon economy is developed, how to apply a new technology to the whole distribution line design and construction process is particularly important to find a novel insulated wire with excellent comprehensive performance and better economic operation in a whole life cycle.
The voltage class of the overhead insulated distribution lines is mostly 10kV and 380V, and a small amount of 20kV lines are adopted in some economically developed areas with large power supply radius. Aiming at 10kV overhead insulated distribution lines, an aluminum core overhead insulated cable (JKLYJ) is usually adopted within the range of 30 to 80m, a steel core aluminum stranded wire core overhead insulated cable (JKLGYJ) is usually adopted within the range of 80 to 400m, a hard copper core overhead insulated cable (JKYJ) is adopted in some economically developed areas, an aluminum alloy core overhead insulated cable (JKLHYJ) specified in GB/T14049-2008 'rated voltage 10kV overhead insulated cable' standard is adopted in a minority area, the aluminum alloy is aluminum alloy (LHA 1 and LHA 2) specified in GB/T23308-2009 'aluminum-magnesium-silicon series alloy round wire' standard for overhead stranded wires, the conductivity of the aluminum alloy is 53 percent and 52.5 percent respectively, and the cross section of the conductor is 240mm 2 Under the condition, the direct current resistance at 20 ℃ is 0.145 omega/km, which is increased by 16 percent compared with the direct current resistance of an aluminum core, and the current-carrying requirement in a common distribution line cannot be met.
The conductors of the 10kV overhead insulated cable are all compressed conductors, the elongation of an aluminum wire is generally between 0.8 and 1.5 percent, the elongation of the aluminum wire after compression deformation is mostly below 1 percent, the fatigue resistance of the cable is greatly reduced, the compressed aluminum core overhead insulated cable has less negative influence when used at a span of 80m or below, the cable breaking risk is increased when the cable is used at the span of more than 80m for a long time, and the steel core aluminum stranded wire core overhead insulated cable has more fatigue vibration cable breaking problems in the application process in northwest windy and coastal windy areas. The compressed high-strength aluminum alloy conductor has poor toughness, so that the cable breakage problem caused by frequent vibration also occurs in the application process. The steel core aluminum stranded conductor core overhead insulated cable has the advantages that the steel core cannot be tightly pressed, the conductor gap is large, water is easy to enter in the running process of the cable, the conductor sag is enlarged, and the problems of sag minimum point breakage or suspension point stress overload breakage occur.
The overhead insulated cable has the characteristics of both the conductor and the cableThe conductor of the overhead insulated cable has the functions of current transmission and self-loading, the common insulation of the overhead insulated cable generally adopts XLPE material, the tensile strength of the insulation material is generally 18 to 24.5MPa, and the volume resistivity is 5 multiplied by 10 13 Omega · m has better insulating property and scratch and abrasion resistance compared with PVC and LDPE insulating materials. In the in-service use, built on stilts insulated cable can reduce the cable and erect the height, improves circuit operation fail safe nature, and built on stilts insulated cable has avoided trees to a certain extent to fell the problem simultaneously, but the cable still generally keeps the clearance more than 1m with building or trees, considers that the cable can lead to insulating attenuate with trees contact for a long time, influences cable life, consequently still will regularly look over and prune trees, brings the inconvenience for the line maintenance.
Therefore, aiming at the vibration wire breakage problem and the water inflow problem of the 10kV overhead insulated cable, the conductor can be made of the medium-strength aluminum alloy (LHA 3, LHA 4) with the molded line structure, the aluminum alloy is the aluminum alloy specified by the NB/T42042-2014 Standard of the Medium-strength aluminum alloy wire for overhead stranded wires, the electric conductivities of the aluminum alloy wires are respectively 58.5 percent and 57 percent, and the cross section of the conductor is 240mm 2 Under the condition, the direct current resistance at 20 ℃ is 0.125 ohm/km, is consistent with the steel-cored aluminum strand core overhead insulated cable, but cannot play an energy-saving effect, and simultaneously, the breaking force is lower than that of the steel-cored aluminum strand by 30 percent, and the heavy-dressing ice overload resistance and the large-stress overload resistance are poorer than those of the steel-cored aluminum strand.
Disclosure of Invention
The invention aims to solve the problems of large overhead insulated distribution line loss, cable breakage and cable short circuit in the prior art, and provides a manufacturing method of an overhead cable and a product thereof.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
a method of manufacturing an aerial cable comprising the steps of:
the method comprises the following steps: producing an aluminum alloy rod;
step two: drawing a round aluminum alloy wire;
drawing the aluminum alloy rod obtained in the step one into a round aluminum alloy wire with the diameter of 3.40 to 3.42mm;
step three: carrying out aging treatment on the round aluminum alloy wire obtained in the step two;
step four: continuously pressing the round aluminum alloy wires obtained in the step three into molding wires and twisting the molding wires to obtain an aluminum alloy molded wire conductor, wherein the aluminum alloy molded wire conductor comprises a round aluminum alloy wire positioned in the center and an inner aluminum alloy molded wire, a middle aluminum alloy molded wire and an outer aluminum alloy molded wire which are sequentially arranged outside the round aluminum alloy wire conductor;
step five: performing stress relief treatment on the aluminum alloy molded line conductor obtained in the step four, and coating shielding and insulation;
step six: continuously storing the cable and extruding the sheath to obtain the energy-saving high-wear-resistance overhead cable with the weight of unit length being less than or equal to 1075kg/km, the outer diameter of the cable being less than or equal to 27.8mm, the breaking force being more than or equal to 75.79kN, the direct-current resistance at 20 ℃ being less than or equal to 0.108 omega/km and the elongation being more than or equal to 3 percent;
and fourthly, placing the plurality of round aluminum alloy wires in a cylindrical wire releasing frame, entering an aluminum alloy wire arranging device and a tension adjusting device through a guide wheel, entering a plurality of groups of round wire rolling forming device with heating function at different tensions and angles to perform molded wire pressing to obtain an inner aluminum alloy molded wire, a middle aluminum alloy molded wire and an outer aluminum alloy molded wire respectively, stranding one round aluminum alloy wire with the inner aluminum alloy molded wire, the middle aluminum alloy molded wire and the outer aluminum alloy molded wire in sequence from inside to outside, and finally twisting and stranding through an arch device to prepare the aluminum alloy molded wire conductor with the pitch.
Further, the inner-layer aluminum alloy molded line is formed by rolling 4 to 6 round aluminum alloy wires through 3 groups of round line rolling molded line devices with heating functions, the middle-layer aluminum alloy molded line is formed by rolling 8 to 12 round aluminum alloy wires through 3 groups of round line rolling molded line devices with heating functions, and the outer-layer aluminum alloy molded line is formed by rolling 13 to 18 round aluminum alloy wires through 3 groups of round line rolling molded line devices with heating functions.
Furthermore, the whole aluminum alloy wire and tension adjusting device comprises a plastic roller and a rectangular wire distributing plate arranged behind the plastic roller.
Furthermore, the device for rolling the round wire into the molded line comprises a plurality of round rollers which are arranged in parallel and at intervals and provided with molded line grooves on the surfaces, and the round rollers are provided with roller induction heaters.
And in the third step, the aging temperature is 181 to 185 ℃, and the aging time is 12 to 13h.
And further, in the fifth step, the aluminum alloy molded line conductor obtained in the fourth step is pressed through 3 groups of rollers which are horizontally arranged and 3 groups of rollers which are vertically arranged, stress relief treatment is carried out, then the aluminum alloy molded line conductor passes through extrusion machines with screw diameters of 64.6 to 65.4mm and 119.6 to 120.4mm, series extrusion shielding and insulation are carried out, the temperature of the screw and the head of the extrusion machine is 130 to 160 ℃ during extrusion shielding, and the temperature of the screw and the head of the extrusion machine is 160 to 250 ℃ during extrusion insulation.
Further, in the sixth step, the product obtained after the insulation is extruded in the fifth step is subjected to water cooling and wire storage, then the sheath is extruded by a sheath extruding machine, and the temperature of a screw and a machine head of the sheath extruding machine is 270-350 ℃.
The invention discloses an overhead cable which is manufactured by adopting a manufacturing method of the overhead cable.
Compared with the prior art, the invention has the beneficial effects that:
1) In the field of aerial cables or aerial conductors with self-bearing effects, the traditional production process of aluminum alloy molded line conductors is to draw aluminum alloy molded line monofilaments firstly, then carry out aging treatment, and transport the aluminum alloy molded line monofilaments to frame twisting equipment for twisting to obtain molded line conductors, the wire drawing process of an aluminum alloy molded line monofilament wire drawing die is difficult, the wire drawing speed is only 8m/min, while the invention directly draws aluminum alloy rods into round aluminum alloy wires, the wire drawing speed is up to 20m/min, and meanwhile, frame type wire mounting is adopted, the capacity of the wire drawing die is 3 times of that of a conventional 630 disc or 710 disc, so in the wire drawing link, the invention greatly improves the production efficiency of the aluminum alloy wires;
2) The round aluminum alloy wire is directly hot-pressed and twisted into a molded line conductor, the production efficiency can reach 40 to 50m/min, the production speed is far greater than 10m/min of a common frame twisting machine, and the effects of energy conservation and consumption reduction are remarkable;
3) According to the invention, the tension of 37 or less round aluminum alloy wires is adjusted through the plastic roller and the rectangular branching plate behind the plastic roller, and then a plurality of round aluminum alloy wires enter 3 groups of round wire rolling forming wire devices with heating functions at different tensions and angles, so that the problems of insufficient deformation and wire breakage of the round aluminum alloy wires caused by improper wire inlet tension of the round aluminum alloy wires can be effectively avoided;
4) After the round aluminum alloy wire enters the round wire rolling forming wire device, the round wire rolling forming wire device with the heating function is adopted, the device is a plurality of round rollers with specific molded line grooves on the surfaces, and the heating purpose is mainly that on one hand, the pressing resistance is reduced, the wire breakage of the round aluminum alloy wire during cold pressing is avoided, and on the other hand, the problem of resistance rise caused by processing hardening during the deformation of the aluminum alloy wire can be solved; the plurality of circular rollers with the specific molded line grooves on the surfaces can realize the miniaturization control of the rollers, so that the mounting and maintenance of the rollers are more convenient and faster; the adoption of the process device can greatly improve the production efficiency of the molded line conductor and greatly reduce the production difficulty;
5) According to the invention, the stress removing device is adopted to reduce the twisting stress of the aluminum alloy molded line conductor so as to obtain the medium-voltage overhead insulated cable with the bending radius being 10 times as small as the outer diameter of the cable, so that the cable is convenient to install, and the safety and reliability of the operation of the cable are improved;
6) According to the invention, under the condition of high temperature difference that the sheath extrusion temperature is up to 350 ℃ and the insulation extrusion temperature is up to 250 ℃, the quick and continuous production of the aerial cable is realized by adopting the insulation cooling water tank and the continuous wire storage wheel, so that the line changing and stopping cost during production is greatly saved;
7) Compared with the commonly used JKLGYJ-10kV 240/30 steel-cored aluminum stranded wire overhead cable, the aluminum alloy type conductor, the shield (mainly an XLPE conductor shield), the insulation (mainly an XLPE natural color insulation) and the sheath (mainly a nylon sheath) adopted by the invention have the characteristics of high strength, low direct current resistance and good wear resistance, can greatly reduce the direct current resistance of the conductor at 20 ℃ to achieve an energy-saving effect, can also obviously improve the heavy icing overload resistance and the large stress overload resistance of the overhead insulated cable, simultaneously adopts natural color crosslinked polyethylene insulation and a black weather-resistant high wear-resistant nylon sheath with the strength of 70MPa, can realize the excellent electric insulation performance and the excellent wear resistance of the insulated cable under the condition of keeping the light weight of the overhead insulated cable, obviously improves the service life of the cable, thoroughly solves the line tree contradiction problem in the application process of the overhead insulated cable, and is suitable for various overhead distribution lines with the excellent energy-saving effect or energy-saving effect due to the ten thousand tons of carbon dioxide emission reduction by adopting the 4.8km overhead insulated power distribution line.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view showing a structure of a plastic roller in the aluminum alloy wire finishing and tension adjusting apparatus according to the present invention;
FIG. 3 is a schematic structural view of a rectangular wire distributing plate in the aluminum alloy wire finishing and tension adjusting device of the present invention;
fig. 4 is a schematic view of the structure of the circular roll of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby clearly defining the protection scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
Example 1
As shown in fig. 1 to 4, a method of manufacturing an overhead cable includes the steps of:
the method comprises the following steps: producing an aluminum alloy rod;
step two: drawing a round aluminum alloy wire;
drawing the aluminum alloy rod obtained in the step one into a round aluminum alloy wire with the diameter of 3.40 to 3.42mm, wherein the round aluminum alloy wire can also be called an aluminum alloy round wire;
step three: carrying out aging treatment on the round aluminum alloy wire obtained in the step two;
step four: continuously pressing the round aluminum alloy wires obtained in the step three into molded wires and twisting the molded wires to obtain an aluminum alloy molded wire conductor 8, wherein the aluminum alloy molded wire conductor 8 comprises a round aluminum alloy wire positioned in the center and an inner aluminum alloy molded wire, a middle aluminum alloy molded wire and an outer aluminum alloy molded wire which are sequentially arranged outside the round aluminum alloy wire conductor;
step five: performing stress relief treatment on the aluminum alloy molded line conductor 8 obtained in the step four, and coating shielding and insulation;
step six: and (3) continuously storing the cable in a cable storage wheel, and continuously extruding and wrapping the sheath to obtain the overhead cable with the unit length weight of not more than 1075kg/km, the outer diameter of the cable of not more than 27.8mm, the tensile force of not less than 75.79kN, the direct current resistance of not more than 0.108 omega/km at 20 ℃, and the elongation of not less than 3%.
In the first step, a Propezi continuous casting and rolling machine is adopted to produce the aluminum alloy rod.
And step two, drawing an aluminum alloy rod with the diameter of 12mm into a round aluminum alloy wire with the diameter of 3.40-3.42mm by using a double-head non-sliding aluminum alloy large drawing machine.
And in the third step, carrying out aging treatment on a round aluminum alloy wire with the diameter of 3.40 to 3.42mm by adopting a tunnel type aging furnace, wherein the aging temperature is 181 to 185 ℃, and the aging time is 12 to 13h.
In the fourth step, a plurality of round aluminum alloy wires 1 are placed in 29 groups or other numbers of cylindrical pay-off frames 2, enter an aluminum alloy wire finishing and tension adjusting device 4 through a guide wheel 3, enter 3 groups or other numbers of round wire rolling and forming device 5 with heating functions at different tensions and angles to perform profile pressing to respectively obtain an inner layer aluminum alloy profile, a middle layer aluminum alloy profile and an outer layer aluminum alloy profile, arrange a central round aluminum alloy wire, an inner layer aluminum alloy profile, a middle layer aluminum alloy profile and an outer layer aluminum alloy profile in sequence from inside to outside, realize doubling and stranding through a nano coating die 6, and finally twist and combine the wires through an arch device 7 to obtain the aluminum alloy profile conductor 8 with pitch.
In the fifth step, the aluminum alloy molded line conductor 8 is pressed by a stress relief device with 3 groups of rollers which are horizontally placed and 3 groups of rollers which are vertically placed, so that the twisting stress in the aluminum alloy molded line conductor 8 is reduced, the aluminum alloy molded line conductor 8 after stress relief treatment passes through an extruding machine with screw diameters of 64.6 to 65.4mm and 119.6 to 120.4mm respectively, a shielding (XLPE conductor shielding) with the thickness of 0.6mm and an insulation (natural XLPE insulation) with the thickness of 2.5mm are extruded in series, the extruded XLPE conductor shielding and the natural XLPE insulation both adopt fast self-crosslinking polyethylene materials, the temperature of a screw rod and a machine head of the extruding machine is 130 to 160 ℃ during extruding and shielding, and the temperature of the screw rod and the machine head of the extruding machine is 160 to 250 ℃.
And step six, cooling the wire core product after insulation extrusion through a water tank, enabling the wire core product to enter a wire storage wheel through an air-jet drying device, enabling the wire storage wheel to be two wheels with the distance of 30m, distributing 10 circles of grooves with the radius of 100mm on the surfaces of the two wheels, enabling the wire storage wheel to store 300m of wire core products, enabling a sheath extruding machine with a follow-up screw diameter of 90mm to continuously extrude a sheath with the thickness of 0.8mm by using the 300m of wire core products when a wire conductor is replaced, enabling the temperature of a screw and a machine head of the sheath extruding machine to be 270-350 ℃, enabling an extruding pipe type mold to be adopted when the sheath is extruded, enabling the inner diameter of a mold core to be 21.8mm, and enabling the inner diameter of the mold sleeve to be 35.6mm.
The aluminum alloy wire finishing and tension adjusting device 4 comprises a plastic roller 10 and a rectangular distributing plate 11 behind the plastic roller, and the adjustment of different tensions and wire-entering angles is realized by adjusting the winding number of the round aluminum alloy wire 1 on the plastic roller 10 and the degree of the round aluminum alloy wire 1 pressed by the plastic roller 10.
The round wire rolling forming line device 5 with the heating function comprises a plurality of round rollers 12 which are arranged in parallel at intervals and provided with line grooves 13 on the surfaces, roller induction heaters 9 are arranged on the round rollers 12, the round rollers 12 are heated at different temperatures by the roller induction heaters 9, and the line grooves 13 can be matched with aluminum alloy lines in shape, size and the like.
The invention discloses an overhead cable which is manufactured by adopting a manufacturing method of the overhead cable.
The parts of the invention not specifically described can be realized by adopting the prior art, and the details are not described herein.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (8)
1. A method of manufacturing an overhead cable, comprising the steps of:
the method comprises the following steps: producing an aluminum alloy rod;
step two: drawing a round aluminum alloy wire;
drawing the aluminum alloy rod obtained in the step one into a round aluminum alloy wire with the diameter of 3.40 to 3.42mm;
step three: carrying out aging treatment on the round aluminum alloy wire obtained in the step two;
step four: continuously pressing the round aluminum alloy wires obtained in the step three into molding wires and twisting the molding wires to obtain an aluminum alloy molded wire conductor, wherein the aluminum alloy molded wire conductor comprises a round aluminum alloy wire positioned in the center and an inner aluminum alloy molded wire, a middle aluminum alloy molded wire and an outer aluminum alloy molded wire which are sequentially arranged outside the round aluminum alloy wire conductor;
step five: performing stress relief treatment on the aluminum alloy molded line conductor obtained in the step four, and coating shielding and insulation;
step six: continuously storing the cable and extruding the sheath to obtain the overhead cable with the weight of unit length less than or equal to 1075kg/km, the outer diameter of the cable less than or equal to 27.8mm, the breaking force more than or equal to 75.79kN, the direct current resistance at 20 ℃ less than or equal to 0.108 omega/km and the elongation more than or equal to 3 percent;
in the second step, an aluminum alloy rod is directly drawn into a round aluminum alloy wire, the wire drawing speed is up to 20m/min, and meanwhile, a frame type wire loading is adopted, and the capacity of the round aluminum alloy wire is 3 times that of a conventional 630 disc or 710 disc;
putting a plurality of round aluminum alloy wires in a cylindrical wire releasing frame, entering an aluminum alloy wire finishing and tension adjusting device through a guide wheel, entering a plurality of sets of round wire rolling and forming device with heating functions at different tensions and angles for molded line pressing to respectively obtain an inner layer aluminum alloy molded line, a middle layer aluminum alloy molded line and an outer layer aluminum alloy molded line, then combining and twisting one round aluminum alloy wire with the inner layer aluminum alloy molded line, the middle layer aluminum alloy molded line and the outer layer aluminum alloy molded line in sequence from inside to outside, and finally twisting and combining the round aluminum alloy wires through an arch device to prepare an aluminum alloy molded line conductor with pitch;
in the fourth step, the round aluminum alloy wire is directly hot-pressed and twisted into a molded line conductor, and the production efficiency reaches 40 to 50m/min.
2. The manufacturing method of the overhead cable according to claim 1, wherein the inner layer aluminum alloy profile is formed by rolling 4 to 6 round aluminum alloy wires through 3 groups of round wires with heating functions into a profile device, the middle layer aluminum alloy profile is formed by rolling 8 to 12 round aluminum alloy wires through 3 groups of round wires with heating functions into the profile device, and the outer layer aluminum alloy profile is formed by rolling 13 to 18 round aluminum alloy wires through 3 groups of round wires with heating functions into the profile device.
3. The method of claim 1, wherein the aluminum alloy wire straightening and tension adjusting device comprises a plastic roller and a rectangular distribution plate disposed behind the plastic roller.
4. The method as claimed in claim 1, wherein the circular line rolling-forming line device comprises a plurality of parallel circular rollers with line grooves on the surfaces, and the circular rollers are provided with roller induction heaters.
5. The manufacturing method of the overhead cable according to claim 1, wherein in the third step, the aging temperature is 181 to 185 ℃ and the aging time is 12 to 13h.
6. The manufacturing method of the overhead cable according to claim 1, wherein in the fifth step, the aluminum alloy molded line conductor obtained in the fourth step is pressed by 3 groups of horizontally arranged and 3 groups of vertically arranged rollers, stress relief treatment is carried out, and then the aluminum alloy molded line conductor passes through extruders with screw diameters of 64.6 to 65.4mm and 119.6 to 120.4mm respectively to be serially extruded and wrapped for shielding and insulation, wherein the temperature of the screw and extruder head is 130 to 160 ℃ during extrusion shielding, and the temperature of the screw and extruder head is 160 to 250 ℃ during extrusion insulation.
7. The manufacturing method of the overhead cable according to claim 1, wherein in the sixth step, the product obtained by extruding and insulating in the fifth step is subjected to water cooling and wire storage, and then a sheath is extruded by a sheath extruder, wherein the temperature of a screw and a head of the sheath extruder is 270 to 350 ℃.
8. An overhead cable produced by the method of any one of claims 1 to 7.
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| CN103354134A (en) * | 2013-06-26 | 2013-10-16 | 江苏双登电力科技有限公司 | Novel method for manufacturing aluminium alloy conductor |
| CN204632404U (en) * | 2015-03-31 | 2015-09-09 | 江苏长峰电缆有限公司 | A kind of novel energy-conserving aerial insulated cable |
| CN105976890A (en) * | 2016-06-22 | 2016-09-28 | 远东电缆有限公司 | Manufacturing method of overhead insulated cable with medium-strength aluminum alloy conductor |
| CN210403326U (en) * | 2019-07-29 | 2020-04-24 | 广州市明兴电缆有限公司 | Steel-cored aluminum stranded conductor overhead insulated cable for 110kV transmission line |
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