CN111508662B

CN111508662B - Production process based on cross-linked extruded insulation power cable

Info

Publication number: CN111508662B
Application number: CN202010212278.0A
Authority: CN
Inventors: 董海伦
Original assignee: Nanjing Longfan Wire And Cable Co ltd
Current assignee: Nanjing Longfan Wire And Cable Co ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2022-01-07
Anticipated expiration: 2040-03-24
Also published as: CN111508662A

Abstract

The invention belongs to the technical field of power cable application, and particularly discloses a production process based on a cross-linked extruded insulated power cable, which comprises the following steps of 1, drawing wires. And 2, twisting the conductor. And step 3, insulating and extruding. And 4, crosslinking by warm water vapor. And step 5, cabling the wire cores. And 6, extruding the sheath. And 7, testing voltage. And 8, inspecting, packaging and warehousing, wherein the packaging can be coiled or looped, the length of the looped cable is 100m, the length of the coiled cable is not less than 100m, the armored cable is not less than 15 times of the outer diameter of the cable, and the unarmored cable is not less than 10 times of the outer diameter of the cable. The production process based on the cross-linked extruded insulation power cable has the beneficial effects that: the process flow is reasonable in design, the production and preparation procedures of the product are easy to control, the quality of the produced finished product is stable, the production cost is reduced, and the economic benefit is improved.

Description

Production process based on cross-linked extruded insulation power cable

Technical Field

The invention belongs to the technical field of power cable application, and particularly relates to a production process of a cross-linked extruded insulation-based power cable.

Background

The wire and cable is used for transmitting electric (magnetic) energy, information and wire products for realizing electromagnetic energy conversion. In the broad sense of wire and cable, also referred to as cable for short, the term "cable" is intended to mean an insulated cable, which may be defined as an assembly of one or more insulated cores, and their respective possible coatings, total protective layers and outer protective layers, the cable also having additional conductors without insulation.

The electric wire and cable products adopted by the electric power system mainly comprise an overhead bare wire, a bus bar (bus), an electric power cable (plastic cable, oilpaper cable (basically replaced by the plastic electric power cable), a rubber sleeve cable, an overhead insulated cable), a branch cable (replacing part of the bus), an electromagnetic wire, an electric equipment wire and cable for electric power equipment and the like; the wire and cable used for the information transmission system of the information transmission system mainly comprises a local telephone cable, a television cable, an electronic cable, a radio frequency cable, an optical fiber cable, a data cable, an electromagnetic wire, an electric power communication or other composite cables and the like; the mechanical instrument system, this part except the built on stilts bare wire almost all other products all have the application, but mainly power cable, electromagnetic wire, data cable, instrument and meter cable etc..

The power cable has various varieties and specifications and wide application range, the used voltage is more than 1kV, and new products such as fire-resistant cables, flame-retardant cables, low-smoke halogen-free/low-smoke low-halogen cables, termite-proof cables, rat-proof cables, oil-proof/cold-resistant/temperature-resistant/wear-resistant cables, medical/agricultural/mining cables, thin-wall wires and the like are continuously developed in the face of special occasions.

The cross-linked extruded insulated power cable is mainly used for transmitting electric energy in a power device and a power line with rated voltage of 0.6/1kV, the existing cross-linked extruded insulated power cable has unreasonable preparation process, the produced product has low quality and does not meet the high standard requirement of use places.

Therefore, in view of the above problems, the present invention provides a process for producing an insulated power cable based on cross-linking extrusion.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a production process based on a cross-linking extrusion-coated insulated power cable, which has the advantages of reasonable process flow design, easily controlled production and preparation procedures of products, stable quality of the produced finished products, reduced production cost and improved economic benefits.

The technical scheme is as follows: the invention provides a production process based on a cross-linked extruded insulated power cable, which comprises the following steps of 1, drawing, wherein the drawing is divided into copper wire drawing and aluminum wire drawing, when the outer diameter of the copper wire drawing or the outer diameter of the aluminum wire drawing is 2.9-2.76 mm, the voltage of continuous drawing annealing equipment is 30-45V, the drawing speed is 500-, the drawing speed is 800-1500 m/min. Step 2, twisting the conductor, wherein the nominal section of the conductor is 10mm²The following strands were twisted by 10mm on a disc stranding machine²The above are twisted on a disc or fork strander. Step 3, insulating and extruding, wherein the nominal section of the conductor is 50mm²The phi 65 plastic extruding machine is extruded with an insulator, and an extruded tube type mould is adopted; nominal cross-section of conductor 50mm²The aboveThe round conductor or the fan-shaped conductor and the cross-linked cable are extruded and insulated on a phi 90 or phi 120 extruding machine, and an extruding pipe type mould is adopted. And 4, crosslinking by warm water steam, namely, adopting 2 warm water steam crosslinking generators 4.5X 2.2X 1.5, heating power of two 24KW-48KW and a temperature controller of 0-171 ℃. Step 5, cabling the wire cores, unarmored cabling, and arranging the conductor with the nominal section of 6mm²Below and below 7 cores 6mm²The following control cables and other types of cables can be cabled on a disc stranding machine, 25mm²The method is carried out on a cable former, firstly, the selected insulated wires with different color numbers or code cores are not rolled into a disc, then, pitch gears are reasonably allocated according to the pitch of the cable cores, the cable cores are rewound, the cable cores are arranged on the cable former according to the cable core arrangement sequence, the cable core arrangement sequence takes the number as an identification mark, and the cable cores are arranged in the clockwise direction: red, yellow, green, blue, black; the cable-forming wire core firstly penetrates through the doubling die, then is wrapped with a plastic tape, and is connected to the take-up reel through the traction wheel; when gaps among the wire cores are large, the wire cores are filled with polypropylene mesh belts or other non-hygroscopic materials, the filled wire cores of the wire cores are kept round, and the phenomenon of serious over-outer diameter is not allowed to occur; the round wire core adopts back-twist cabling, the fan-shaped wire core adopts non-back-twist cabling, the fan-shaped wire core is reversely pre-twisted before entering the doubling core, the fan-shaped wire core is generally pre-twisted for 2-3 circles, and then passes through the fan-shaped locking correction device to enter the doubling die, and the fan-shaped wire is not allowed to turn over during cabling. Step 6, extruding the sheath, wherein the outer diameter of the extruded sheath is 6mm before being extruded by a plastic extruding machine according to the diameter of the cable²The following were carried out on a phi 65 extruder, the external diameter before extrusion was 10mm²The above is on the phi 90 extruder or phi 120 extruder. Step 7, voltage testing, namely, firstly, orderly stacking each coil or each circle of wires under an electrode, stripping a sheath of 100 and 200mm from one end of a test sample according to the test requirement, and only reserving insulating wire cores, wherein the insulating wire cores are separated, the length of the stripped insulating layer of 1-3 cores is not less than 20mm, the length of more than three cores is not less than 30mm, and the insulating wire cores are separated by a certain distance from the other end; then checking whether all switch buttons of the test bed, the voltage regulator, the voltage meter and the ammeter are sensitive and reliable, and whether the grounding wire of the high-voltage wire is firm and reliable; then after the wiring is finished, all people are informed to quit the high-voltage field and tryAnd when the test is started, the power switch is turned on, the power indicator lamp is turned on, the boost button is pressed, the indicator lamp is turned on, the zero position is turned on, the voltage is increased in the clockwise direction, and when the voltmeter is increased to the specified test voltage value. If the breakdown of the test product is found, the voltage reduction button is immediately pressed, the voltage reduction button returns to a zero position, the test site can be accessed by turning off the power supply, the breakdown position is checked, the mark is made, the measurement voltage of the tested product is tested according to the standard requirement of the product; and finally, stacking the tested products according to different specifications, making an inspection state identifier and making a test record. And 8, inspecting, packaging and warehousing, wherein the packaging can be coiled or looped, the length of the looped cable is 100m, the length of the coiled cable is not less than 100m, the armored cable is not less than 15 times of the outer diameter of the cable, and the unarmored cable is not less than 10 times of the outer diameter of the cable.

In the technical scheme, in the step 2, a single-wire joint is welded, and the distance between two joints in the same layer is not less than 500 mm; the galvanized steel wires in the aluminum stranded wires and the steel-cored aluminum stranded wires are not allowed to have any joints for welding, and the distance between any two joints on the same single wire is not less than 15 m.

In the step 2, when the number of the aluminum stranded layers is 1, the number of the joints is 2, when the number of the aluminum stranded layers is 2, the number of the joints is 3, when the number of the aluminum stranded layers is 3, the number of the joints is 4, and when the number of the aluminum stranded layers is 4, the number of the joints is 5.

In the technical scheme, in the step 3, the rated voltage 1KV cross-linked overhead cable is processed on a phi 120 plastic extruding machine, the 10KV cross-linked overhead cable is provided with a conductor shield, and the conductor shield and the insulation extrusion are simultaneously and respectively co-extruded on the phi 65 plastic extruding machine and the phi 120 plastic extruding machine;

wherein, the temperature of the two-layer co-extrusion is +/-10 ℃, 1) the conductor shielding: the extrusion temperature of the F65 extruder was divided into 6 zones, 4 zones in the body, 2 zones in the head, body: 110, 120, 130, 140, the handpiece: 145-150; 2) the crosslinked polyethylene is insulated, the extrusion temperature of the phi 120 extruder is divided into 9 zones, 6 zones of the machine body, 4 zones of the machine head, 140 zones of the machine body, 160 zones, 170 zones, 180 zones, 190 zones, 200 zones, 210 zones and 220 zones.

In the technical scheme, in the step 3, the extrusion insulation temperature is +/-10 ℃, and 1) the extrusion temperature of the phi 65 extruder is divided into 5 areas, wherein 4 machine bodies and 1 machine head are provided, the PVC machine body is provided with 160-170-180-190 materials, and the machine head is provided with 200 materials; 2) the extrusion temperature of the phi 90 extruder is divided into 8 zones, 5 zones of the extruder body and 3 zones of the extruder head, PVC, the extruder body 110-; 3) the extrusion temperature of the phi 120 extruder is divided into 9 zones, 6 zones of the extruder body and 4 zones of the extruder head, the PVC extruder body 110 is divided into 120 zones, 140 zones, 150 zones, 160 zones and 170 zones, the extruder head 170 is divided into 180 zones, 180 zones and 190 zones, the cross-linked PE extruder body 140 is divided into 150 zones, 160 zones and 170 zones, and the extruder head 190 is divided into 200 zones, 210 zones and 22 zones.

In the present technical solution, in the step 4, when the nominal cross-section is 1.5 to 70 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 6 hours; when the nominal section is 95-240 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 8 hours; when the nominal section is 300-plus 400 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 10 hours.

In the technical scheme, in the step 5, the cable core for cabling and armoring layer is wrapped with a layer of plastic tape as an inner liner layer, the inner liner layer is wrapped on the cable core by a PVC tape, and the wrapping adopts a cover lapping type, so that the wrapping is tight and continuous in tape and tape shortage; when a cable core wrapped with an inner layer passes through an armoring machine, the wire core is fixed by using a proper wire stabilizing die, the inner layer is not allowed to be scraped or the wire core is not allowed to be blocked, wherein when the armoring machine is used for armoring, a steel belt is firstly rewound on a disc core with the width equivalent to that of the steel belt, the steel belt rewound on the disc core is compact and neat, the uneven belt edges are knocked flat by using a wooden hammer, the steel belt edges are not allowed to curl, then the steel belt rewound on the disc core is put on a steel belt disc of the armoring machine, a disc cover is tightened, a pinch roller is put down, the steel belt is wound on the wire core through an adjusting guide wheel, the armor layer is wound in a double-layer steel belt clearance type manner, the steel belt is wound on the cable core in a front-back manner, the winding direction is in a left direction, the wire core wound on the steel belt is fixed by using the wire stabilizing die, the gap width of the steel belt is 40% -50%, the outer steel belt covers the middle of the gap of the inner layer steel belt, and finally, the joint of the steel belt is welded, the welding is firm, and the joint needs to be repaired to be smooth.

In the technical scheme, in the step 6, the wires extruded with the sheath are orderly wound on the cable reel, the inner diameter of the reel and the armored cable are not less than 15 times of the outer diameter, and the unarmored cable is not less than 10 times of the outer diameter.

In step 7, the single-core cable: the grounding wire is placed in the water tank, one end of the cable is exposed out of the water tank, and the other end of the cable is connected to the high-pressure column; the multi-core cable is characterized in that a tested wire core is firmly connected to a binding post of a high-voltage ground wire according to a test wiring method.

Compared with the prior art, the production process based on the cross-linking extrusion-coated insulated power cable has the beneficial effects that: the process flow is reasonable in design, the production and preparation procedures of the product are easy to control, the quality of the produced finished product is stable, the production cost is reduced, and the economic benefit is improved.

Drawings

Fig. 1 is a schematic view of a detection wiring structure of the production process of a cross-linked extruded insulated power cable according to the present invention.

Detailed Description

The invention is further elucidated with reference to the drawings and the embodiments.

Examples

The invention provides a production process based on a cross-linked extruded insulated power cable, which comprises the following steps of 1, drawing, wherein the drawing is divided into copper wire drawing and aluminum wire drawing, when the outer diameter of the copper wire drawing or the outer diameter of the aluminum wire drawing is 2.9-2.76 mm, the voltage of continuous drawing annealing equipment is 30-45V, the drawing speed is 500-, the drawing speed is 800-1500 m/min. Step 2, twisting the conductor, wherein the nominal section of the conductor is 10mm²The following strands were twisted by 10mm on a disc stranding machine²The above are twisted on a disc or fork strander. Step 3, insulating and extruding, wherein the nominal section of the conductor is 50mm²Extruding and coating insulation on a phi 65 plastic extruding machineUsing a tube extruding type mould; nominal cross-section of conductor 50mm²The round conductor or the fan-shaped conductor and the cross-linked cable are extruded and insulated on a phi 90 or phi 120 extruding machine, and an extruding pipe type mould is adopted. And 4, crosslinking by warm water steam, namely, adopting 2 warm water steam crosslinking generators 4.5X 2.2X 1.5, heating power of two 24KW-48KW and a temperature controller of 0-171 ℃. Step 5, cabling the wire cores, unarmored cabling, and arranging the conductor with the nominal section of 6mm²Below and below 7 cores 6mm²The following control cables and other types of cables can be cabled on a disc stranding machine, 25mm²The method is carried out on a cable former, firstly, the selected insulated wires with different color numbers or code cores are not rolled into a disc, then, pitch gears are reasonably allocated according to the pitch of the cable cores, the cable cores are rewound, the cable cores are arranged on the cable former according to the cable core arrangement sequence, the cable core arrangement sequence takes the number as an identification mark, and the cable cores are arranged in the clockwise direction: red, yellow, green, blue, black; the cable-forming wire core firstly penetrates through the doubling die, then is wrapped with a plastic tape, and is connected to the take-up reel through the traction wheel; when gaps among the wire cores are large, the wire cores are filled with polypropylene mesh belts or other non-hygroscopic materials, the filled wire cores of the wire cores are kept round, and the phenomenon of serious over-outer diameter is not allowed to occur; the round wire core adopts back-twist cabling, the fan-shaped wire core adopts non-back-twist cabling, the fan-shaped wire core is reversely pre-twisted before entering the doubling core, the fan-shaped wire core is generally pre-twisted for 2-3 circles, and then passes through the fan-shaped locking correction device to enter the doubling die, and the fan-shaped wire is not allowed to turn over during cabling. Step 6, extruding the sheath, wherein the outer diameter of the extruded sheath is 6mm before being extruded by a plastic extruding machine according to the diameter of the cable²The following were carried out on a phi 65 extruder, the external diameter before extrusion was 10mm²The above is on the phi 90 extruder or phi 120 extruder. Step 7, voltage testing, namely, firstly, orderly stacking each coil or each circle of wires under an electrode, stripping a sheath of 100 and 200mm from one end of a test sample according to the test requirement, and only reserving insulating wire cores, wherein the insulating wire cores are separated, the length of the stripped insulating layer of 1-3 cores is not less than 20mm, the length of more than three cores is not less than 30mm, and the insulating wire cores are separated by a certain distance from the other end; then checking whether all the switch buttons, voltage regulators, voltage meters and current meters of the test bed are sensitive and reliable, and whether the grounding wire of the high-voltage wire is firmLeaning on; and then after wiring is finished, informing all people of quitting the high-voltage field, starting a test, switching on a power switch, turning on a power indicator lamp to press a boost button, turning on the indicator lamp, starting the zero position to release clockwise to boost, and when the voltmeter rises to a specified test voltage value. If the breakdown of the test product is found, the voltage reduction button is immediately pressed, the voltage reduction button returns to a zero position, the test site can be accessed by turning off the power supply, the breakdown position is checked, the mark is made, the measurement voltage of the tested product is tested according to the standard requirement of the product; and finally, stacking the tested products according to different specifications, making an inspection state identifier and making a test record. And 8, inspecting, packaging and warehousing, wherein the packaging can be coiled or looped, the length of the looped cable is 100m, the length of the coiled cable is not less than 100m, the armored cable is not less than 15 times of the outer diameter of the cable, and the unarmored cable is not less than 10 times of the outer diameter of the cable.

Preferably, in the step 2, the single-wire joints are welded, and the distance between the two joints in the same layer is not less than 500 mm; the galvanized steel wires in the aluminum stranded wires and the steel-cored aluminum stranded wires are not allowed to have any joints for welding, and the distance between any two joints on the same single wire is not less than 15 m; and in the step 2, when the number of the aluminum stranded layers is 1, the number of joints is 2, when the number of the aluminum stranded layers is 2, the number of joints is 3, when the number of the aluminum stranded layers is 3, the number of joints is 4, and when the number of the aluminum stranded layers is 4, the number of joints is 5; and in the step 3, the rated voltage 1KV cross-linked overhead cable is carried out on a phi 120 plastic extruding machine, the 10KV cross-linked overhead cable is provided with a conductor shield, and the conductor shield and the insulation extrusion are simultaneously and respectively co-extruded on the phi 65 plastic extruding machine and the phi 120 plastic extruding machine; wherein, the temperature of the two-layer co-extrusion is +/-10 ℃, 1) the conductor shielding: the extrusion temperature of the F65 extruder was divided into 6 zones, 4 zones in the body, 2 zones in the head, body: 110, 120, 130, 140, the handpiece: 145-150; 2) the crosslinked polyethylene is insulated, the extrusion temperature of the phi 120 extruder is divided into 9 zones, 6 zones of the machine body, 4 zones of the machine head, 140 zones of the machine body, 160 zones, 170 zones, 180 zones, 190 zones, 200 zones, 210 zones and 220 zones.

Further preferably, in the step 3, the extrusion insulation temperature is + -10 ℃, and the extrusion temperature of the 1) phi 65 extruder is divided into 5 zones, wherein 4 frames, 1 head, 160 PVC frames, 170 frames, 180 frames, 190 frames, 200 heads(ii) a 2) The extrusion temperature of the phi 90 extruder is divided into 8 zones, 5 zones of the extruder body and 3 zones of the extruder head, PVC, the extruder body 110-; 3) the extrusion temperature of the phi 120 extruder is divided into 9 zones, 6 zones of the extruder body and 4 zones of the extruder head, the PVC extruder body 110 is used for 140-160-170, the extruder head 170 is used for 180-190, the cross-linked PE extruder body 140 is used for 150-160-170-190, and the extruder head 190 is used for 200-210; and in the step 4, when the nominal section is 1.5-70 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 6 hours; when the nominal section is 95-240 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 8 hours; when the nominal section is 300-plus 400 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 10 hours; and in the step 5, cabling and armoring layers are added, wherein a cable core for adding the armoring layers is coated with a layer of plastic tape serving as an inner liner layer, the inner liner layer is wrapped on the cable core by a PVC tape, and the wrapping adopts a lap-cover type, is tight, and is continuous in tape and tape shortage; when a cable core wrapped with an inner layer passes through an armoring machine, the wire core is fixed by using a proper wire stabilizing die, the inner layer is not allowed to be scraped or the wire core is not allowed to be blocked, wherein when the armoring machine is used for armoring, a steel belt is firstly rewound on a disc core with the width equivalent to that of the steel belt, the steel belt rewound on the disc core is compact and neat, the uneven belt edges are knocked flat by using a wooden hammer, the steel belt edges are not allowed to curl, then the steel belt rewound on the disc core is put on a steel belt disc of the armoring machine, a disc cover is tightened, a pinch roller is put down, the steel belt is wound on the wire core through an adjusting guide wheel, the armor layer is wound in a double-layer steel belt clearance type manner, the steel belt is wound on the cable core in a front-back manner, the winding direction is in a left direction, the wire core wound on the steel belt is fixed by using the wire stabilizing die, the gap width of the steel belt is 40% -50%, the outer steel belt covers the middle of the gap of the inner layer steel belt, and finally, the joint of the steel belt is welded, the welding is firm, and the joint needs to be repaired to be smooth.

Further preferably, in the step 6, the wires wrapped by the extruded sheath should be wound on the cable reel regularly, and the inner diameter and the armored cable of the reel are not less than 15 times of the outer diameter, and the unarmored cable is not less than 10 times of the outer diameter.

As shown in fig. 1, in step 7, the single-core cable: the grounding wire is placed in the water tank, one end of the cable is exposed out of the water tank, and the other end of the cable is connected to the high-pressure column; the multi-core cable is characterized in that a tested wire core is firmly connected to a binding post of a high-voltage ground wire according to a test wiring method.

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.

Claims

1. The production process based on the cross-linked extruded insulated power cable is characterized by comprising the following steps of: the method comprises the following steps of 1, drawing, namely drawing copper wires and drawing aluminum wires, wherein when the outer diameter of the drawn copper wires or the outer diameter of the drawn aluminum wires is 2.9mm, the voltage of continuous drawing annealing equipment is 30V, the drawing speed is 500 m/min, when the outer diameter of the drawn copper wires or the outer diameter of the drawn aluminum wires is 2.34mm, the voltage of the continuous drawing annealing equipment is 45V, the drawing speed is 1000 m/min, when the outer diameter of the drawn copper wires or the outer diameter of the drawn aluminum wires is 2.25mm, the voltage of the continuous drawing annealing equipment is 26V, the drawing speed is 800 m/min, when the outer diameter of the drawn copper wires or the outer diameter of the drawn aluminum wires is 1.35mm, the voltage of the continuous drawing annealing equipment is 40V, and the drawing speed is 1500 m/min;

step 2, twisting the conductor, wherein the nominal section of the conductor is 10mm²The following strands were twisted by 10mm on a disc stranding machine²The above are twisted on a disc type or fork type stranding machine;

step 3, insulating and extruding, wherein the nominal section of the conductor is 50mm²The phi 65 plastic extruding machine is extruded with an insulator, and an extruded tube type mould is adopted; nominal section of conductor is 50mm²The round conductor or the fan-shaped conductor is extruded and insulated on the phi 90 or phi 120 extruding machine, and an extruding pipe type die is adopted;

step 4, crosslinking by warm water steam, namely, adopting 2 warm water steam crosslinking generators, wherein the size of a single generator is 4.5X 2.2X 1.5 m, and the heating power is 24KW-48KW, wherein the power of the single generator is 24KW, and the control range of a temperature controller is 0-171 ℃;

step 5, cabling the wire cores, unarmored cabling, and arranging the conductor with the nominal section of 6mm²The following canCabling on a disc stranding machine, 25mm²Above should go on the cable-former, at first with the insulated wire that selects, different colours or sign indicating number sinle silk can not be drawn into a dish in, again according to the cable core pitch, reasonable allotment pitch gear, after rewinding sinle silk should adorn on the cable-former according to sinle silk arrangement order again, and sinle silk arrangement order uses the numeral to arrange clockwise for the identification mark: red, yellow, green, blue, black; the cable-forming wire core firstly penetrates through the doubling die, then is wrapped with a plastic tape, and is connected to the take-up reel through the traction wheel; when gaps among the wire cores are large, the wire cores are filled with polypropylene mesh belts or other non-hygroscopic materials, the filled wire cores are kept round, and the phenomenon of serious over-outer diameter is not allowed to occur; the round wire cores are stranded by back-twist, the fan-shaped wire cores are stranded by no back-twist, the fan-shaped wire cores are pre-twisted reversely for 2-3 circles before entering the stranding core, and then pass through the fan-shaped locking correction device to enter the stranding die, and the fan-shaped wires are not allowed to turn over during stranding;

step 6, extruding the sheath, wherein the outer diameter of the extruded sheath is 6mm before being extruded by a plastic extruding machine according to the diameter of the cable²The following were carried out on a phi 65 extruder, the external diameter before extrusion was 10mm²The above is carried out on a phi 90 extruding machine or a phi 120 extruding machine;

step 7, voltage testing, namely, firstly, orderly stacking each coil or each circle of wires under an electrode, stripping a sheath of 100 and 200mm from one end of a test sample according to the test requirement, and only reserving insulating wire cores, wherein the insulating wire cores are separated, the length of the stripped insulating layer of 1-3 cores is not less than 20mm, the length of more than three cores is not less than 30mm, and the insulating wire cores are separated by a certain distance from the other end; then checking whether all switch buttons of the test bed, the voltage regulator, the voltage meter and the ammeter are sensitive and reliable, and whether the grounding wire of the high-voltage wire is firm and reliable; after the wiring is finished, informing all people to quit the high-voltage field, starting the test, switching on a power switch, turning on a power indicator light to press a voltage-boosting button, turning on the indicator light, starting to clockwise place a zero position to boost the voltage, when a voltmeter is raised to a specified test voltage value, immediately pressing the voltage-reducing button to return to the zero position if the breakdown of a test product is found, turning off the power supply to enter the test field, checking the breakdown position, making a mark, measuring the voltage of the tested product, and testing according to the standard requirement of the product; finally, stacking the tested products according to different specifications, making an inspection state identifier and simultaneously making a test record;

and 8, inspecting, packaging and warehousing, wherein the packaging can be coiled or looped, the length of the looped cable is 100m, the length of the coiled cable is not less than 100m, and the length of the unarmored cable is not less than 10 times of the outer diameter of the cable.

2. The process for producing a power cable based on cross-linked extruded insulation according to claim 1, wherein: in the step 2, the single-wire joints are welded, and the distance between the two joints in the same layer is not less than 500 mm; the galvanized steel wires in the aluminum stranded wires and the steel-cored aluminum stranded wires are not allowed to have any joints for welding, and the distance between any two joints on the same single wire is not less than 15 m.

3. The process for producing a power cable based on cross-linked extruded insulation according to claim 2, wherein: in the step 2, when the number of the aluminum stranded layers is 1, the number of the joints is 2, when the number of the aluminum stranded layers is 2, the number of the joints is 3, when the number of the aluminum stranded layers is 3, the number of the joints is 4, and when the number of the aluminum stranded layers is 4, the number of the joints is 5.

4. The process for producing a power cable based on cross-linked extruded insulation according to claim 1, wherein: in the step 3, the rated voltage 1KV cross-linked overhead cable is processed on a phi 120 plastic extruding machine, the 10KV cross-linked overhead cable is provided with a conductor shield, and the conductor shield and the insulation extrusion are simultaneously and respectively co-extruded on the phi 65 plastic extruding machine and the phi 120 plastic extruding machine; two-layer co-extrusion, 1) conductor shielding: the extrusion temperature of the phi 65 extruder is divided into 6 areas, wherein 4 areas of the machine body, 2 areas of the machine head and the machine body are as follows: 110, 120, 130, 140, the handpiece: 145-150; 2) the crosslinked polyethylene is insulated, the extrusion temperature of the phi 120 extruder is divided into 10 zones, 6 zones of the machine body, 4 zones of the machine head, 140 zones of the machine body, 160 zones, 170 zones, 180 zones, 190 zones, 200 zones, 210 zones and 220 zones.

5. The process for producing a power cable based on cross-linked extruded insulation according to claim 4, wherein: in the step 3, insulation extrusion is carried out, and 1) the extrusion temperature of the phi 65 extruder is divided into 5 areas, wherein 4 machine bodies and 1 machine head are provided, the PVC machine body is provided with 160-materials, 170-materials and 180-materials, and the machine head is provided with 200-materials; 2) the extrusion temperature of the phi 90 extruder is divided into 8 zones, 5 zones of the machine body and 3 zones of the machine head, PVC, the machine body 110, 130, 150, 160, 170, the cross-linking PE, the machine body 170, 180, 190, 200, and the machine head 220, 230, 240; 3) the extrusion temperature of the phi 120 extruder is divided into 10 zones, 6 zones of the extruder body and 4 zones of the extruder head, the PVC extruder body 110 is divided into 120 zones, 140 zones, 150 zones, 160 zones, 170 zones, 180 zones, 190 zones, the cross-linked PE extruder body 140 is divided into 150 zones, 160 zones, 170 zones, 180 zones, 190 zones, 200 zones, 210 zones and 220 zones.

6. The process for producing a power cable based on cross-linked extruded insulation according to claim 1, wherein: in the step 4, when the nominal section is 1.5-70 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 6 hours; when the nominal section is 95-240 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 8 hours; when the nominal section is 300-plus 400 mm²The temperature of the crosslinking steam is 90 +/-5 ℃ and the time is 10 hours.

7. The process for producing a power cable based on cross-linked extruded insulation according to claim 1, wherein: in the step 5, a cable forming and armoring layer is added, a cable core for adding the armoring layer is wrapped with a layer of plastic tape serving as an inner liner layer, the inner liner layer is wrapped on the cable core by a PVC tape, the wrapping adopts a lap-cover type, the wrapping is tight, and the tape is not broken or lacking; when a cable core wrapped with an inner layer passes through an armoring machine, the wire core is fixed by using a proper wire stabilizing die, the inner layer is not allowed to be scraped or the wire core is not allowed to be blocked, wherein when the armoring machine is used for armoring, a steel belt is firstly rewound on a disc core with the width equivalent to that of the steel belt, the steel belt rewound on the disc core is compact and neat, the uneven belt edges are knocked flat by using a wooden hammer, the steel belt edges are not allowed to curl, then the steel belt rewound on the disc core is put on a steel belt disc of the armoring machine, a disc cover is tightened, a pinch roller is put down, the steel belt is wound on the wire core through an adjusting guide wheel, the armor layer is wound in a double-layer steel belt clearance type manner, the steel belt is wound on the cable core in a front-back manner, the winding direction is in a left direction, the wire core wound on the steel belt is fixed by using the wire stabilizing die, the gap width of the steel belt is 40% -50%, the outer steel belt covers the middle of the gap of the inner layer steel belt, and finally, the joint of the steel belt is welded, the welding is firm, and the joint needs to be repaired to be smooth.

8. The process for producing a power cable based on cross-linked extruded insulation according to claim 1, wherein: in the step 6, the wires of the extruded sheath are orderly wound on the cable reel, the inner diameter of the reel and the armored cable are not less than 15 times of the outer diameter, and the unarmored cable is not less than 10 times of the outer diameter.

9. The process for producing a power cable based on cross-linked extruded insulation according to claim 1, wherein: in the step 7, the single-core cable: the grounding wire is placed in the water tank, one end of the cable is exposed out of the water tank, and the other end of the cable is connected to the high-pressure column; the multi-core cable is characterized in that a tested wire core is firmly connected to a binding post of a high-voltage ground wire according to a test wiring method.