Method for manufacturing polyvinyl chloride power cable with extruded insulation

Abstract

The application belongs to the technical field of power cable, and particularly discloses a manufacturing method of polyvinyl chloride extrusion insulated power cable, which comprises the following steps: step 1, wire drawing and annealing; step 2, bundle and strand; step 3, stranding; step 4, extrusion and power frequency spark inspection; step 5, silane cross-linking insulation core rewinding and cross-linking; step 6, copper tape wrapping shielding layer; step 7, metal braiding shielding layer; step 8, cabling; step 9, armoring; and step 10, looping. The application has the beneficial effects that the process flow design is reasonable, the product production preparation process is easy to control, the quality of the finished product produced is stable, the production cost is reduced, and the economic benefit is improved; in the extrusion process in the stranding, the comparison between the tight conductor and the non-tight conductor is as follows: a) process characteristics: improving efficiency, reducing consumption and stable structure; b) electric field intensity: capable of playing the role of uniform electric field; c) softness: decreased; and d) the amount of structural material: reduced, and the material consumption of the plastic cable is saved by about 1.8%.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power cable application, and particularly relates to a manufacturing method of polyvinyl chloride extruded insulation power cable. BACKGROUND

[0002] Wire and cable is a wire product used to transmit electric (magnetic) energy, information and realize electromagnetic energy conversion. In a broad sense, wire and cable is also simply referred to as cable, and in a narrow sense, cable is defined as a collection of the following parts: one or more insulated cores, and their respective possible cladding layers, total protective layer and outer protective layer. Cable can also have additional conductors without insulation.

[0003] Power cables have various types and specifications, and are widely used in various fields. The voltage used is mostly 1kV or below. New products are continuously derived for special occasions, such as fire-resistant cable, flame-retardant cable, low-smoke halogen-free / low-smoke low-halogen cable, termite-resistant cable, mouse-resistant cable, oil-resistant / cold-resistant / temperature-resistant / wear-resistant cable, medical / agricultural / mining cable and thin-wall wire.

[0004] The polyvinyl chloride extruded insulation power cable is an extruded insulation cable using polyvinyl chloride polymer material as insulation and sheath, and is mainly used for transmitting electric energy in power devices and power lines with a rated voltage of 0.6 / 1kV. The existing cross-linked extruded insulation power cable has unreasonable preparation process, and the product quality is low, which does not meet the high standard requirements of the use site.

[0005] Based on the above problems, the application provides a manufacturing method of polyvinyl chloride extruded insulation power cable. SUMMARY

[0006] The purpose of the application is to provide a manufacturing method of polyvinyl chloride extruded insulation power cable to improve the product quality of the polyvinyl chloride extruded insulation power cable, aiming at the deficiencies of the prior art.

[0007] The manufacturing method of the polyvinyl chloride extruded insulation power cable provided by the application comprises the following steps: step 1, wire drawing and annealing, using a ten-die aluminum drawing machine, the wire inlet diameter is 9.5mm, the wire outlet diameter is 1.70-4.72mm, the maximum drawing pass number is 13, the wire inlet diameter is 3.5mm, and the wire outlet diameter is 1.35mm; wherein the circular aluminum wire annealing is performed by using a pit-type annealing device, when the wire inlet diameter is 9.5mm, the wire outlet speed is 1.0-5.6m / s, the annealing current is 4-9A, and the annealing voltage is 25-50V; step 2, bundle twisting, using a GST-500 wire bundling machine, the pitch adjustment range is 6mm-60mm, and the production range is 0.5-2.5mm 2The maximum number of 84, single maximum diameter 0.68, using JCJX-800XB high-speed cantilever stranding machine, pitch adjustment range: 30mm-200mm, suitable for core diameter, Φ1.0mm-4.0mm, stranding direction is left, right; Step 3, stranding, using JLC-400 / 6 fork stranding machine or JLC-400 / 6+12+18 fork stranding machine or LC-400 / 6+12+18+24 fork stranding machine or LC-500 / 12+18+24 fork stranding machine or JLK-500 / 12+18+24 frame stranding machine stranding, the unit diameter of stranding is 1.0-5.0mm, wherein, tight pressure fan-shaped pressure roller: tight pressure fan-shaped 120°3 equal core, 90°4 equal core, 3+1 core, 72°5 equal core, 4+1 core, 3+2 core each seven sets, tight pressure tile-shaped pressure roller: tile-shaped 90° / 89°5 equal core, 4+1 core, tight pressure tile-shaped 100°3+2 core, tight pressure semicircular pressure roller: semicircular 180° each seven sets, circular tight pressure drawing die: fifteen sets of tight pressure circular die; Step 4, extrusion and power frequency spark test, using SJ-65x25 extruder or SJ-80x25 extruder or SJ-90x25 extruder or SJ-120x25 extruder and power frequency spark test, wherein, when the power frequency spark test is started, the take-up motor is adjusted to ensure that the insulation of each point withstands high voltage for not less than 0.1 seconds, and the take-up speed is not greater than 7m / s; Step 5, silane crosslinked insulation wire core rewinding and crosslinking process, first, the insulation wire core is hoisted on the pay-off stand, the wire head is wrapped and sealed with plastic tape, the wire head is introduced into the metering wheel, then the metering is cleared and the metering is started, the wire core is uniformly arranged and rewound on the take-up reel, the power frequency spark test is carried out on the insulation wire core during the rewinding process, the insulation wire core is repaired with a special repair strip, and the repaired insulation wire core is re-tested after repair, if the repaired insulation wire core is unqualified for three times, the repair is not carried out, after rewinding, the wire core end is sealed and fixed with a cable cap or a plastic self-adhesive tape to prevent water vapor from entering the insulation wire core during the crosslinking process in the steam box, finally, the rewound silane crosslinked insulation wire core is transported to the warm water pool or the steam box for crosslinking; Step 6, copper tape shielding layer, first, adjust and select the winding head speed and traction gear according to the product structure, then the copper tape should be continuous and not missed, the winding should be tight, flat and wrinkle-free, the copper tape joint must be cut into 45 0Right and left rear welding, welding reliable, copper band overlap rate of not less than 15%, insulation needs to be cooled to room temperature before copper band shielding, shielding should pay attention to the core, if found abnormal should be timely stop processing, the last collection of wire diameter should be not less than 40 times of the outer diameter after shielding, the wire after loading is at least lower than the edge of the disc 50mm, after inspection qualified after the disc is transported to the specified position, T-shaped stack; Step 7, metal woven shielding layer, using GBZ-16A weaving before the maximum diameter is 16mm or JMB-24 type braiding machine, weaving before the maximum diameter is 20mm, according to the cable core structure size, the mold is configured, the mold aperture is greater than 2-4mm of the woven outer diameter, according to the specific cable core structure control and adjustment; Step 8, cabling process, using LK-400 / 6+12 type stranding machine, the production range is 19 cores and below control cable, 19 pairs and below computer cable and part of other types of cable or using JCL-1250 / 2+3 cabling machine, the production range is 10-300mm 2 Power cable, electrical equipment wire and cable, control cable, communication cable, computer cable, compensation cable and other special cable; Step 9, armoring process, using KZ-630 type armoring machine, the production range is medium and low voltage power cable or JL-400 / 12+18 cabling machine set armor device (630 armoring head), the production range is 0.75-6mm 2 Power cable, control cable, communication cable, computer cable, compensation cable and other special cable; Step 10, coiling process, using medium-sized coiling machine, the coiling range is 5.0-35mm diameter wire and cable products or high-speed coiling machine, the coiling range is 1-4.5mm diameter wire and cable products.

[0008] The technical scheme, in the step 1, when the wire diameter is 1.35-1.99 mm, the annealing temperature is 290 degrees Celsius, and the holding time is 4 h; when the wire diameter is 2-3 mm, the annealing temperature is 300 degrees Celsius, and the holding time is 4 h; when the wire diameter is 7 / 1.35-7 / 1.7 mm, the annealing temperature is 310 degrees Celsius, and the holding time is 3 h; when the wire diameter is 7 / 2.14-7 / 2.52 mm, the annealing temperature is 380-400 degrees Celsius, and the holding time is 3 h; when the wire diameter is 19 / 1.78-19 / 2.52 mm, the annealing temperature is 380-400 degrees Celsius, and the holding time is 4 h; when the wire diameter is 37 / 2.03-37 / 2.52 mm, the annealing temperature is 380-400 degrees Celsius, and the holding time is 4 h; when the wire diameter is 61 / 2.25-61 / 2.52 mm, the annealing temperature is 400-420 degrees Celsius, and the holding time is 4 h; when the wire diameter is 1.78-2.52 mm, the annealing temperature is 240 degrees Celsius, and the holding time is 4 h; when the wire diameter is 2.26-2.76 mm, the annealing temperature is 245 degrees Celsius, and the holding time is 4 h; when the wire diameter is 2.76 mm or above, the annealing temperature is 250 degrees Celsius, and the holding time is 4 h.

[0009] The technical scheme, in the step 2, according to the pitch length requirement, the gear is replaced, and the pitch multiple ratio of the bundled wire is L / D, L is the pitch length, and D is the stranded outer diameter, and the pitch is not greater than 25 times, and the pitch of 7 bundled wires is not greater than 20 times; wherein, the operation is ① first, the fine copper wire is pulled out from the pay-off rack, passes through the ceramic hole on the wire distribution plate, then passes through the appropriate doubling die, passes through the shaft center hole, passes through the guide wheel and the guide wheel on the bow frame, enters the rear shaft center hole, and is led to the traction wheel and the pulley until it is wound on the take-up reel for 3 to 4 turns, and the wire tail is pressed; ② close the protective cover, start slowly, bundle 8-10 m, stop and check whether the stranded pitch meets the requirements, and whether the tension of the take-up reel is appropriate, and if not, adjust; ③ the first bundled wire core is stopped after being collected to 20-30 m, the pitch is measured by pulling out 2-3 m from the take-up reel, and whether the requirements are met is confirmed, and after the inspection is qualified, the formal opening can be started.

[0010] In this technical solution, in step (3), A. Stranding method: There are two stranding methods for conductive wire cores: non-twist stranding and twisted stranding. ① Wire cores stranded using the twisted method do not have torsional internal stress, so they are mostly used for loose stranded wires to avoid the wires from breaking apart due to internal stress. ② Non-twist stranding is mostly used for tightly compressed wire cores because the residual stress generated by self-twist is elastic deformation, while compression is plastic deformation, so the internal stress can be eliminated after compression. B. Stranding direction: ① Regardless of whether the twisting direction of bare stranded wires is concentric stranding or double stranding, the outermost layer is specified to be right-handed (Z-shaped). ② For conductors with insulation layers, the outermost layer of stranding is left-handed (S-shaped). ③ Whether right-handed or left-handed, the stranding directions of adjacent layers must be opposite. This is for product uniformity, easy connection, and to prevent single wires from loosening. C. Parallelization die: ① The shunting die is a crucial control point for stranded wires: the uniformity of the stranded wire diameter, the presence of serpentine strands, missing strands, and skipping are all revealed here. ② The shunting die generally consists of two semicircles; the inner hole of the steel die is chrome-plated, but a hardwood die can also be used. ③ The function of the shunting die is to sizing and shaping the stranded wire cores. Experience shows that the die's aperture should be slightly smaller than the calculated outer diameter by 0.1–0.3 mm. D. Compacting: Compacting is mainly used for stranding insulated conductors; bare wires are generally not compacted. ① The purpose of compacting: a) To increase the fill factor, reduce the conductor's geometric dimensions, and save on insulation and sheathing. Materials, b) Improve conductor surface smoothness and uniform conductor surface electric field, c) Reduce the chance of voids forming in the cable; ② Compacting process: a) The compacting process of round stranded conductors is that the first and third passes are vertical compaction, and the second and fourth passes are horizontal compaction; the first and second passes have a compaction amount of 80%, and the third and fourth passes have a rounding effect with a compaction amount of 20%; compared with non-compacted conductors, the outer diameter of round compacted conductors can be reduced by 7.2-9.17%, and the fill factor (regular stranding) can be increased from 75% to 90-93%; b) Sector stranded conductors 25-50mm 2 Only one vertical clamping operation is required; 70mm 2 After the outermost layer of conductors of 100 and above is stranded, it is subjected to three compressions: vertical, horizontal and vertical compressions. The first compression is 85%, the second compression is for shaping (both sides), and the third compression is for shaping. The filling coefficient of the compressed sector conductor can reach 90-93%.

[0011] The technical scheme, in the step 4, first, the power supply setting parameter is opened to warm the fuselage and the nose, the warming time is controlled according to the equipment performance and the type of plastic, and is appropriately adjusted according to the operation experience of the operator, when the XLPE extrusion is adopted, the warming temperature should be lower than the extrusion temperature, and attention should be paid to the reaction of the ammeter when the warming starts; then, the structure size and appearance quality of the conductive core or the insulated core or the cable core are checked according to the operation production notice, the unqualified conductor, insulated core and cable core cannot be produced on the vehicle, the corresponding mold is selected according to the type and specification of the production, and the distance between the mold core and the mold cover is preliminarily calibrated, the 60-mesh filter screen is placed at the connection between the mold head and the fuselage before the mold head is mounted, the drawing speed is adjusted according to the product to be produced, and whether it is normal is observed in the idling operation, the drawing rope is preliminarily drawn from the water tank opening to the reel, and is wound 3-4 turns on the traction wheel, the track traction should be adjusted according to the type of the product; finally, the discharge is checked to check whether the extruded plastic is well plasticized and the surface is smooth, the temperature is appropriately adjusted according to the situation to make it stable to the process requirement of the product appearance, the eccentricity of the mold is finely adjusted, the main machine should be started first and then the auxiliary machine is started for the double-color extruding machine, so that the color layer is clear, and the double-color production can be extruded after the two machines are normal, the double-color wire can be divided into four-part extrusion and two-part extrusion. The water inlet valve of the water tank is opened, the water quantity is appropriate, the wire or the insulated core or the cable core is firmly connected with the drawing line through the mold core. The main machine and the traction machine are started, the extrusion type mold should be extruded for a certain length (2-3 meters), the eccentricity is checked after the marking and stopping, and the mold core is further adjusted, and the extrusion type mold should be adjusted when the mold core is adjusted.

[0012] In the step 8, (1) the core identification and the arrangement order of the wire, A, the power cable, ① two cores: red, blue or using digital code 1.0; ② three cores: red, yellow, green or using code 1, 2, 3; ③ four cores: red, yellow, green, blue or digital code 1.2.3.0; ④ five cores: red, yellow, green, blue, black (according to the needs of the customer, green / yellow can be used) or 1.2.3.4.0 or 1.2.3.4.5 can be used, wherein, 0 represents the neutral core or the insulated core for grounding, green / yellow represents the insulated core for grounding, 10mm 2The crosslinked polyethylene insulated wire core of the insulated wire core can be identified and recognized by the corresponding color band; B, control cable, ① control cable cable core identification and color or digital coding, the outermost layer can use a yellow / green double color line, the upper line sequence of the digital coding wire core is: from inside to outside, clockwise direction, starting from 1 and arranging in turn; ② the color spectrum of the control cable insulated wire core, 1) two-core cable without preferred color spectrum; 2) three-core cable: yellow / green, blue, brown, or blue, black, brown; 3) four-core cable: yellow / green, blue, black, brown, or blue, black, brown, black or brown; 4) five-core cable: yellow / green, blue, black, brown, black or brown, or blue, black, brown, black or brown, black or brown; 5) more than five-core cable: one core is yellow / green in the outer layer, one core is blue, and the other insulated wire cores are the same color, but not green, yellow, light blue or brown; in other layers, one core is brown, and the other insulated wire cores are the same color, but not green, yellow, light blue or brown; in other layers, one core is brown, and the other insulated wire cores are the same color, but not green, yellow, light blue or brown; C, the wire core identification and arrangement of the rated voltage 450 / 750V and below polyvinyl chloride insulated polyvinyl chloride sheathed wire cable are respectively executed according to GB / T 5023-2008 and JB / T 8734-2016 standards;

[0013] D, the insulated wire core of computer cable and other special cables is arranged according to the corresponding color spectrum confirmation method or the production notice.

[0014] The cabling in step 8 is generally completed by multiple modes, ⑴ the first pressing mode hole diameter is 1.0-2.5mm larger than the cabling core diameter, only plays a folding role, and does not make the fan-shaped turning; ⑵ the second pressing mode hole diameter is 0-0.6mm smaller than the cabling core diameter, plays a first tight pressing role; ⑶ the third pressing mode hole diameter (if any) is 0-0.4mm smaller than the cabling diameter, plays a shaping role, and the shorter the distance between the wrapping tape and the wrapping tape mode, the tighter the cabling.

[0015] In the step 8, the fan-shaped and tile-shaped cable diameter calculation formula is: 1) D=Rx2, wherein D represents the cable diameter, and R represents the height of the insulated core (when the width of the insulated core is more than 2 times the height, the formula is not applicable); 2) D=Mh (2 cores), wherein D represents the cable diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 3) D=Mh (3 cores), wherein D represents the cable diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 4) D=Mh (4 cores), wherein D represents the cable diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 5) D=Mh (3+1 cores), wherein D represents the cable diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 6) D=2h+d (4+1, 3+2, five cores), wherein D represents the cable diameter, h represents the tile-shaped thickness, and d represents the small circle diameter; and 7) D=2.154h+d (4+1, 3+2, five cores), wherein D represents the cable diameter, h represents the tile-shaped thickness, and d represents the small circle diameter.

[0016] In the step 9, the same disc cable is allowed to adopt only one specification thickness of steel belt, the two layers of steel belts are both gap wrapped, the wrapping direction is right, the wrapping should be tight and flat, the overlapping rate of the upper and lower two layers of steel belts should be not less than 25% of the width of the steel belt, the wrapping gap should be not greater than 50% of the width of the steel belt, the steel belt welding must be lap welding, the steel belt joint should be cut at an angle of 45°, the angle is parallel to the cable axial direction after wrapping, the joint is overlapped by 3-10 mm, the joint surface should be repaired flat and firm, the joint edge should not have burrs, sharp corners and other phenomena; the steel belt armor wrapping should be tight, and there should be no wrapping leakage phenomenon, the steel belt with defects such as inclusion, burr, sand inclusion and rust should be removed, the steel belt wrapping tension is controlled, the maximum tension is when the disc is full, otherwise the steel belt is easy to fly out; the tension should be adjusted when the disc is half, otherwise the cable will be damaged or the steel belt will be curled to damage the cable core.

[0017] In the step 10, the disc diameter size of the formed circle (disc) is determined according to the product specification and length size of the formed circle, and the formed circle shape size of the same specification and length size is consistent each time; wherein the length of the formed circle is 100 m, the deviation is not more than ±0.5 m, the length is measured by a meter counter, the short section with a length of not less than 10 m is allowed to be delivered, the number of which is not more than 10% of the total length of delivery, and each short section should not be more than 5 sections.

[0018] Compared with the prior art, the polyvinyl chloride extruded insulation power cable manufacturing method has the advantages that: 1. the process flow design is reasonable, the product production process is easy to control, the quality of the finished product is stable, the production cost is reduced, and the economic benefit is improved; 2. the parallel line die in the twisting is practical, and the steel die not only has high cost, but also scratches the conductor, which is easy to cause burrs on the core; 3. in the extrusion process in the twisting, the comparison between the tightly pressed conductor and the non-tightly pressed conductor: a) process characteristics: improve efficiency, reduce consumption, and stable structure; b) electric field strength: can play a role in uniform electric field; c) softness: decreased; d) the amount of structural material: reduced, and the material consumption of the plastic cable is saved by about 1.8%. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0020] Figure 1 is the pitch ratio adjustment diagram of the polyvinyl chloride extruded insulation power cable manufacturing method of the present application;

[0021] Figure 3 is the spark test voltage diagram of the cross-linked extruded insulation power cable manufacturing method of the present application;

[0022] Figure 2 、 Figure 8 is the temperature setting diagram of the polyvinyl chloride extruded insulation power cable manufacturing method of the present application;

[0023] Figure 4 is the cross-linking temperature diagram of the polyvinyl chloride extruded insulation power cable manufacturing method of the present application;

[0024] Figure 5 、 Figure 6 is the cable core structure control and adjustment diagram of the polyvinyl chloride extruded insulation power cable manufacturing method of the present application;

[0025] Figure 7 is the nominal thickness diagram of the armored metal belt of the polyvinyl chloride extruded insulation power cable manufacturing method of the present application. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "top," "bottom," and "side" are used interchangeably.

[0028] "The other side", "the front", "the back", "the middle part", "the inside", "the top",

[0029] The orientation or positional relationship indicated by terms such as "bottom end" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. For those skilled in the art, the specific meaning of the above terms in the invention can be understood according to the specific circumstances.

[0030] Example

[0031] The manufacturing method of the polyvinyl chloride extruded insulated power cable of the present invention includes the following steps: Step 1, wire drawing and annealing, using a ten-die aluminum drawing machine, with an inlet wire diameter of 9.5mm, an outlet wire diameter of 1.70-4.72mm, a maximum of 13 drawing passes, an inlet wire diameter of 3.5mm, and an outlet wire diameter of 1.35mm; wherein, round aluminum wire is used for annealing using a well-type annealing device, with an outlet wire speed of 1.0-5.6m / s when the inlet wire diameter is 9.5mm, an annealing current of 4-9A, and an annealing voltage of 25-50V; Step 2, stranding and bundling, using a GST-500 stranding machine, with a pitch adjustment range of 6mm-60mm and a production range of 0.5-2.5mm. 2Maximum number of strands: 84; maximum single filament diameter: 0.68 mm; JCJX-800XB high-speed cantilever stranding machine is used; pitch adjustment range: 30mm-200mm; applicable core outer diameter: Φ1.0mm-4.0mm; stranding direction: left-hand and right-hand. Step 3: Stranding. Use a JLC-400 / 6 fork-type stranding machine, JLC-400 / 6+12+18 fork-type stranding machine, LC-400 / 6+12+18+24 fork-type stranding machine, LC-500 / 12+18+24 fork-type stranding machine, or JLK-500 / 12+18+24 frame-type stranding machine for stranding. The unit diameter of the stranded strands is 1.0-5.0mm. The compaction fan-shaped pressure rollers are used for: 120° 3-core, 90° 4-core, 3+1 core, 72° 5-core, and 4+1 core. Seven sets each of core and 3+2 core; compaction rollers: 90° / 89° 5-core, 4+1 core, 100° 3+2 core; compaction rollers: seven sets each of semi-circular and 180° semi-circular; compaction drawing dies: fifteen sets of compaction circular dies; Step 4: Extrusion and power frequency spark test, using an SJ-65×25 extruder, SJ-80×25 extruder, SJ-90×25 extruder, or SJ-120×25 extruder and power frequency spark test (see...). Figure 3 During the power frequency spark test, the take-up motor is started and the take-up speed is adjusted. To ensure that the high voltage time at each point of insulation is not less than 0.1 seconds, the take-up speed is not greater than 7 m / s. Step 5: Rewinding and cross-linking process of silane cross-linked insulated wire core. First, the insulated wire core is hoisted on the pay-off frame, and the wire end is sealed with plastic tape. The wire end is introduced into the meter counting wheel, and then the count is reset to zero and the meter is counted. The wire core is evenly arranged and rewound onto the take-up reel to start take-up. During the rewinding process, a power frequency spark test is performed on the insulated wire core at the specified test voltage. If the insulated wire core breaks down, it is repaired with a special repair strip (same model and same color). After repair, it should be retested. If the repair fails three times in a row, no further repair is required. After rewinding, the end of the wire core is sealed and fixed with a cable cap or plastic self-adhesive tape to prevent water vapor from entering the insulated wire core during the cross-linking process in the steam box. Finally, the rewinded silane cross-linked insulated wire core is transported to a warm water tank or steam box to prepare for cross-linking (see Figure 4 Step 6: Wrap the copper strip around the shielding layer. First, adjust and select the wrapping head speed and traction gear according to the product structure. Then, the copper strip wrapping should be continuous and without gaps. The wrapping should be tight, flat, and wrinkle-free. When splicing the copper strip, it must be cut to 45 degrees. 0Right and left back welding, welding reliable, copper band overlap rate of not less than 15%, insulation needs to be cooled to room temperature before copper band shielding, shielding should pay attention to the core, if found abnormal should be timely stop processing, the last collection of wire diameter should be not less than 40 times of the outer diameter after shielding, the wire after loading is at least lower than the edge of the disc 50mm, after inspection qualified after loading to the specified position, T-shaped stacking; Step 7, metal woven shielding layer, using GBZ-16A woven before the maximum diameter is 16mm or JMB-24 type braiding machine, woven before the maximum diameter is 20mm, according to the cable core structure size, the mold is configured, the mold hole diameter is greater than the woven outer diameter 2-4mm, according to the specific cable core structure control and adjustment (see Figure 5 and Figure 6 );Step 8, cabling process, using LK-400 / 6+12 type stranding machine, production range of 19 core and below control cable, 19 pairs and below computer cable and part of other types of cable or using JCL-1250 / 2+3 cabling machine, production range of 10-300mm 2 power cable, electrical equipment wire and cable, control cable, communication cable, computer cable, compensation cable and other special cable; Step 9, armoring process, using KZ-630 type armoring machine, production range of medium and low voltage power cable or JL-400 / 12+18 cabling machine set armor device (630 armoring head), production range of 0.75-6mm 2 power cable, control cable, communication cable, computer cable, compensation cable and other special cable, armored metal belt nominal thickness (see Figure 7 );Step 10, coiling process, using medium-sized coiling machine, coiling range of 5.0-35mm diameter wire and cable products or high-speed coiling machine, coiling range of 1-4.5mm diameter wire and cable products.

[0032] In addition, preferably, in step 1, when the wire diameter is 1.35-1.99 mm, the annealing temperature is 290 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 2-3 mm, the annealing temperature is 300 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 7 / 1.35-7 / 1.7 mm, the annealing temperature is 310 degrees Celsius, and the holding time is 3 hours; when the wire diameter is 7 / 2.14-7 / 2.52 mm, the annealing temperature is 380-400 degrees Celsius, and the holding time is 3 hours; when the wire diameter is 19 / 1.78-19 / 2.52 mm, the annealing temperature is 380-400 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 37 / 2.03-37 / 2.52 mm, the annealing temperature is 380-400 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 61 / 2.25-61 / 2.52 mm, the annealing temperature is 400-420 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 1.78-2.52 mm, the annealing temperature is 240 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 2.26-2.76 mm, the annealing temperature is 245 degrees Celsius, and the holding time is 4 hours; when the wire diameter is 2.76 mm or more, the annealing temperature is 250 degrees Celsius, and the holding time is 4 hours.

[0033] In addition, preferably, in step 2, according to the pitch length requirement, the gear is replaced (the control is specified to proceed), and the pitch ratio of the bundled wire is L / D, L is the pitch length, and D is the stranded outer diameter, which is not more than 25 times, and the pitch of the 7-stranded bundle is not more than 20 times of control. Figure 1 The operation is ① first pull out the fine copper wire from the pay-off rack, pass through the ceramic holes on the wire distribution plate, then pass through the appropriate doubling die, pass through the shaft center hole, pass through the guide wheels on the guide wheel and the arch, pass through the rear shaft center hole, and lead to the traction wheel and the pulley until it is wound on the take-up reel for 3 to 4 turns, and at the same time, the wire tail is pressed; ② close the protective cover, start slowly, bundle 8-10 m, stop and check whether the stranded pitch meets the requirements, and whether the tension of the take-up reel is appropriate, if not, adjust it; ③ the first bundle of wire cores is stopped after being collected to 20-30 m, 2-3 m is taken out from the take-up reel to measure the pitch, and whether it meets the specified requirements is confirmed, and after inspection, it can be officially started.

[0034] The technical solution has the following steps (3), A, the twisting method, the conductive wire core has two twisting methods, no twist twisting and twist twisting, ① the wire core twisted by the twist method has no torsional internal stress, so it is mostly used for non-tight twisted wire to avoid the dispersion of single wire breakage due to internal stress, ② the twisted wire without twist is mostly used for tight twisted wire core, because the residual stress generated by self-twist is elastic deformation, and the pressure type is plastic deformation, so the internal stress can be eliminated after tight pressure; B, the twisting direction, ① the twisting direction of bare twisted wire is right (Z-shaped) regardless of concentric twisting or complex twisting, ② the outermost layer of the conductor for the covering insulation layer is left (S-shaped), ③ regardless of right or left, the twisting direction of adjacent two layers must be opposite, which is to unify the product, facilitate connection, and prevent single wire loosening; C, the parallel line die, ① the parallel line die is an important control point of twisted wire: the uniformity of the diameter of twisted wire, the presence or absence of snake shape, missing root and jumping phenomenon are all reflected here, ② the parallel line die is generally composed of two semicircles, the inner hole of the steel die is plated with chromium, and a hard wood die can also be used, ③ the function of the parallel line die is to make the twisted wire core into a certain size, experience shows that the hole diameter of the parallel line die is slightly smaller than the calculated outer diameter by 0.1-0.3mm; D, tight pressure, tight pressure is mainly used for the twisting of insulated conductors, bare wires are generally not tight, ① the purpose of tight pressure: a) increase the filling factor, reduce the geometric size of the conductor, save insulation and sheath materials, b) improve the smoothness of the conductor surface, uniform the electric field on the conductor surface, c) reduce the opportunity of forming voids in the cable; ② tight pressure process: a) the tight pressure process of circular twisted conductor is vertical tight pressure in the first and third stages, and horizontal tight pressure in the second and fourth stages; the tight pressure amount of the first and second stages is 80%, the third and fourth stages are round shaping, and the tight pressure amount is 20%; compared with non-tight pressure conductor, the outer diameter of circular tight pressure conductor can be reduced by 7.2-9.17%, and the filling factor (normal twisting) can be increased from 75% to 90-93%; b) the fan-shaped twisted conductor 25-50mm 2 may only be vertically tight pressed once; 70mm 2 and above, the outermost layer of the conductor is twisted and then three tight pressure is performed, i.e. vertical, horizontal and vertical tight pressure, the first tight pressure amount is 85%, the second stage is shaping (both sides), and the third stage is shaping, the filling factor of the tight pressure fan-shaped conductor can reach 90-93%.

[0035] In addition, preferably, in step 4, first turn on the power (press Figure 2 and Figure 8) Set the parameters to the body, the head of the machine, the heating time according to the performance of the device, the type of plastic control, and according to the operator's operating experience to be adjusted properly, when using XLPE extrusion, the heating temperature should be lower than the extrusion temperature, pay attention to the reaction of the ammeter when starting to heat; Then, according to the operation production notice, the structure size and appearance quality of the conductive core or insulated core or cable core are checked, and the unqualified conductor, insulated core and cable core cannot be produced, according to the production model specification, the corresponding mold is selected, and the distance between the mold core and the mold cover is preliminarily calibrated, 60 mesh filter screen is placed at the connection between the mold head and the machine body before the mold head, the traction speed is adjusted according to the product produced, and the empty running is run to see if it is normal, the traction rope is pre-laid from the water tank to the wire reel, and 3-4 turns are wound on the traction wheel, the track traction should be adjusted according to the product type; Finally, check the material discharge, whether the extruded plastic is well plasticized, and whether the surface is smooth, adjust the temperature appropriately according to the situation to make it stable to the process requirements of product appearance, fine-tune the eccentricity of the mold, the double-color extruder should be started first and then the auxiliary machine, so that the color and luster layering is clear, and the two machines can be extruded for double-color production, double-color wire can be divided into four-section extrusion and two-section extrusion. Open the water inlet valve of the water tank, and make the water volume appropriate. The wire or insulated core or cable core is connected with the traction line through the mold core.

[0036] In addition, preferably, in step 8, (1) wire core identification and arrangement order of the wire, A, power cable, ① two cores: red, blue or use digital code 1.0; ② three cores: red, yellow, green or use code 1, 2, 3; ③ four cores: red, yellow, green, blue or digital code 1.2.3.0; ④ five cores: red, yellow, green, blue, black (according to customer needs, green / yellow can be used) or 1.2.3.4.0 or 1.2.3.4.5 can be used, wherein, 0 represents neutral core or ground insulated core, green / yellow represents ground insulated core, 10mm 2The crosslinked polyethylene insulated wire core of the insulated wire core of the control cable can be identified and distinguished by corresponding color bands; B, control cable, ① control cable cable core identification and color or digital coding, the outermost layer can use a yellow / green double-color wire, the upper wire sequence of the digital coding wire core is: from inside to outside, clockwise, starting from 1 and arranging in turn; ② the color spectrum of the control cable insulated wire core, 1) two-core cable without preferred color spectrum; 2) three-core cable: yellow / green, blue, brown, or blue, black, brown; 3) four-core cable: yellow / green, blue, black, brown, or blue, black, brown, black or brown; 4) five-core cable: yellow / green, blue, black, brown, black or brown, or blue, black, brown, black or brown, black or brown; 5) more than five-core cable: one core is yellow / green in the outer layer, one core is blue, and the other insulated wire cores are the same color but not green, yellow, light blue or brown; in other layers, one core is brown, and the other insulated wire cores are the same color but not green, yellow, light blue or brown; in other layers, one core is brown, and the other insulated wire cores are the same color but not green, yellow, light blue or brown; C, the wire core identification and arrangement of the polyvinyl chloride insulated and jacketed wire and cable with rated voltage 450 / 750V and below are executed according to GB / T 5023-2008 and JB / T 8734-2016 standards; D, the insulated wire core of computer cable and other types of special cable is arranged according to the corresponding color spectrum confirmation method or determined according to the production notice.

[0037] In addition, preferably, the cabling in step 8 is generally completed by multiple modes, ⑴ the first pressing die aperture is 1.0-2.5mm larger than the cabling core diameter, only serving to fold, without making the fan-shaped part turn over; ⑵ the second pressing die aperture is 0-0.6mm smaller than the cabling core diameter, serving as the first tight pressing; ⑶ the third pressing die aperture (if any) is 0-0.4mm smaller than the cabling diameter, serving as the shaping, and the shorter the distance between the wrapping tape and the wrapping die, the tighter the cabling.

[0038] Further preferably, in step 8, the formula for calculating the outer diameter of the fan-shaped and tile-shaped cable is: 1) D = R x 2, wherein D represents the outer diameter of the cable, and R represents the height of the insulated core (when the width of the insulated core is more than 2 times the height, the formula is not applicable); 2) D = Mh (2 cores), wherein D represents the outer diameter of the cable, M represents the outer diameter ratio empirical coefficient, and h represents the height of the fan; 3) D = Mh (3 cores), wherein D represents the outer diameter of the cable, M represents the outer diameter ratio empirical coefficient, and h represents the height of the fan; 4) D = Mh (4 cores), wherein D represents the outer diameter of the cable, M represents the outer diameter ratio empirical coefficient, and h represents the height of the fan; 5) D = Mh (3+1 cores), wherein D represents the outer diameter of the cable, M represents the outer diameter ratio empirical coefficient, and h represents the height of the fan; 6) D = 2h + d (4+1, 3+2, five cores), wherein D represents the outer diameter of the cable, h represents the thickness of the tile, and d represents the diameter of the small circle; and 7) D = 2.154h + d (4+1, 3+2, five cores), wherein D represents the outer diameter of the cable, h represents the thickness of the tile, and d represents the diameter of the small circle.

[0039] Further preferably, in step 9, the same disc-shaped cable is allowed to adopt only one thickness of steel strip, both layers of the steel strip are gap-wrapped, the wrapping direction is right, the wrapping should be tight and flat, the overlapping rate of the upper and lower layers of the steel strip should be not less than 25% of the width of the steel strip, the wrapping gap should be not more than 50% of the width of the steel strip, the steel strip must be lap-welded when welded, the steel strip joint should be cut at an angle of 45°, the angle should be parallel to the axial direction of the cable after wrapping, the joint should be overlapped by 3-10 mm, the surface of the joint should be repaired flat and firm, the edge of the joint should not have burrs, sharp corners, and other phenomena; the steel strip should be wrapped tightly, and should not have a wrapping gap, if the steel strip has inclusions, burrs, sand inclusions, rust defects, the steel strip should be removed, the wrapping tension of the steel strip should be controlled, the maximum tension should be when the disc is full, otherwise the steel strip is easy to fly out; the tension should be adjusted to be loose when the disc is half full, otherwise the cable will be damaged or the steel strip will be curled to damage the cable core.

[0040] Further preferably, in step 10, the disc diameter size of the formed circle (disc) is determined according to the product specification and length size of the formed circle, and the outer shape size of the formed circle of the same specification and length size is consistent each time; wherein the length of the formed circle is 100 m, the deviation is not more than ±0.5 m, the length is measured by a meter counter, short sections with a length of not less than 10 m are allowed to be delivered, the number of which is not more than 10% of the total length of the delivery, and each short section should not exceed 5 sections.

[0041] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A process for the production of a polyvinyl chloride power cable with extruded insulation, characterized in that: It comprises the following steps, Step 1, wire drawing annealing, using ten die aluminum drawing machine, the wire diameter is 9.5mm, the wire diameter is 1.70-4.72mm, the maximum drawing pass is 13, the wire diameter is 3.5mm, the wire diameter is 1.35mm; wherein, using circular aluminum wire annealing using pit annealing device, when the wire diameter is 9.5mm, the wire speed is 1.0-5.6m / s, the annealing current is 4-9A, the annealing voltage is 25-50V; Step 2, bundle the strand, use GST-500 bundle machine, pitch adjustment range is 6mm-60mm, production range is 0.5-2.5mm 2 Maximum number of 84, single maximum diameter 0.68, use JCJX-800XB high-speed cantilever strand cable machine, pitch adjustment range: 30mm-200mm, suitable core diameter Φ1.0mm-4.0mm, the direction of twisting is left and right; Step 3, stranding, using JLC-400 / 6 fork stranding machine or JLC-400 / 6+12+18 fork stranding machine or LC-400 / 6+12+18+24 fork stranding machine or LC-500 / 12+18+24 fork stranding machine or JLK-500 / 12+18+24 frame stranding machine for stranding, the unit diameter of stranding is 1.0-5.0mm, Wherein, the tight pressure fan-shaped pressure wheel: tight pressure fan-shaped 120°3 equal core, 90°4 equal core, 3+1 core, 72°5 equal core, 4+1 core, 3+2 core each seven sets, tight pressure tile-shaped pressure wheel: tile-shaped 90° / 89°5 equal core, 4+1 core, tight pressure tile-shaped 100°3+2 core, tight pressure semicircular pressure wheel: semicircular 180° each seven sets, circular tight pressure drawing die: fifteen sets of tight pressure circular die; Step 4, extrusion and power frequency spark test, using SJ-65x25 extruder or SJ-80x25 extruder or SJ-90x25 extruder or SJ-120x25 extruder and power frequency spark test, wherein, when the power frequency spark test is started, the take-up motor is adjusted, in order to ensure that each point of the insulation withstands high voltage for not less than 0.1 seconds, the take-up line speed is not greater than 7m / s; Step 5, silane crosslinked insulation wire core rewinding and crosslinking process, first, the insulation wire core is hung on the pay-off rack, the wire head is wrapped and sealed with plastic tape, the wire head is introduced into the metering wheel, then the metering is cleared and the metering is started, the wire core is uniformly arranged and rewound on the take-up reel, the power frequency spark test is carried out on the insulation wire core during the rewinding process, the insulation wire core is repaired with special repair strip when breakdown occurs, the insulation wire core should be re-spark tested after repair, if three consecutive repairs are unqualified, the repair is not carried out, after rewinding, the wire core end is sealed and fixed with cable cap or plastic self-adhesive tape to prevent water vapor from entering the insulation wire core during the crosslinking process in the steam box, finally, the rewound silane crosslinked insulation wire core is transported to the warm water pool or the steam box for crosslinking; Step 6, copper tape wrapping shielding layer, first according to the production of product structure adjustment and selection of wrapping head speed and traction gear, then copper tape should be kept continuous, not wrap, wrap needs to be tight, flat, no wrinkles, copper tape joint must be cut into 45 0 left and right welding, copper tape wrapping the overlap rate is not less than 15%, insulation needs to be cooled to room temperature before copper tape shielding, the last collection reel diameter should be not less than 40 times the outer diameter of the shielding, the line core after loading is at least lower than the edge of the disc 50mm, after the inspection qualified after the next disc to the specified location, T-shaped stack; Step 7, metal braided shielding layer, using GBZ-16A braiding before the maximum diameter is 16mm or JMB-24 type braiding machine, braiding before the maximum diameter is 20mm, according to the structure and size of the cable core, the mold is matched, the aperture of the matched mold is 2-4mm larger than the braided outer diameter, which is specifically controlled and adjusted according to the structure of the cable core; Step 8, cabling process, using LK-400 / 6+12 type stranding machine, production range 19 core and below control cable, 19 pairs and below computer cable and part of other types of cable or using JCL-1250 / 2+3 cabling machine, production range 10-300mm 2 power cable, wire and cable for electrical equipment, control cable, communication cable, computing cable, compensation cable and other special cable; Step 9, the process of armoring, using KZ-630 type armoring machine, production range for medium and low voltage power cable or JL-400 / 12+18 cabling machine unit armoring device, production range for 0.75-6mm 2 power cable, control cable, communication cable, computing cable, compensation cable and other special cable; Step 10, looping process, using medium-sized looping machine, the looping range of wire and cable products is 5.0-35mm in diameter, or high-speed looping machine, the looping range of wire and cable products is 1-4.5mm in diameter.

2. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: In step 1, when the wire diameter is 1.35-1.99mm, the annealing temperature is 290 degrees Celsius, the holding time is 4h; when the wire diameter is 2-3mm, the annealing temperature is 300 degrees Celsius, the holding time is 4h; when the wire diameter is 7 / 1.35-7 / 1.7mm, the annealing temperature is 310 degrees Celsius, the holding time is 3h; when the wire diameter is 7 / 2.14-7 / 2.52mm, the annealing temperature is 380-400 degrees Celsius, the holding time is 3h; when the wire diameter is 19 / 1.78-19 / 2.52mm, the annealing temperature is 380-400 degrees Celsius, the holding time is 4h; when the wire diameter is 37 / 2.03-37 / 2.52mm, the annealing temperature is 380-400 degrees Celsius, the holding time is 4h; when the wire diameter is 61 / 2.25-61 / 2.52mm, the annealing temperature is 400-420 degrees Celsius, the holding time is 4h; when the wire diameter is 1.78-2.52mm, the annealing temperature is 240 degrees Celsius, the holding time is 4h; when the wire diameter is 2.26-2.76mm, the annealing temperature is 245 degrees Celsius, the holding time is 4h; when the wire diameter is 2.76mm or above, the annealing temperature is 250 degrees Celsius, the holding time is 4h.

3. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: In step 2, according to the pitch length requirement, replace the gear, and the pitch ratio of the bundled wire is L / D, L is the pitch length, and D is the stranded outer diameter, which is not more than 25 times, and the pitch of 7 bundled wires is not more than 20 times; Wherein, the operation is ① first pull out the fine copper wire from the wire frame through the ceramic hole on the wire distribution plate, then through the appropriate doubling die, through the shaft center hole, pass through the guide wheel and the guide wheel on the bow frame, enter the rear shaft center hole, and lead to the traction wheel and the pulley until winding on the take-up reel 3 to 4 turns, and press the wire tail at the same time; ② Close the protective cover, start slowly, bundle 8-10m, stop and check whether the stranding pitch meets the requirements and whether the tension of the take-up reel is appropriate, and adjust if not appropriate; ③ The first bundled core is stopped after being collected to 20-30m, 2-3m is taken out from the take-up reel to measure the pitch, and whether it meets the specified requirements is confirmed, and the inspection is qualified before formal opening.

4. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: In step 3, A, stranding method, there are two stranding methods for the conductor core, no twist stranding and twist stranding, ① The wire core stranded by the twist stranding method has no torsional internal stress, so it is often used for non-tight stranding to avoid the spread of single wire due to internal stress when it breaks, ② The stranding without twist is often used for tight stranding, because the residual stress generated by self-twist is elastic deformation, and the pressure type is plastic deformation, so the internal stress can be eliminated after tight pressure; B, stranding direction, ① the twist direction of bare stranded wire is right Z-shaped whether it is concentric stranding or complex stranding, ② the outermost layer of the conductor used for covering the insulating layer is left S-shaped, ③ whether it is right or left, the stranding direction of adjacent two layers must be opposite to prevent single wire from loosening; C, and the line model, ① and the line model is an important control point of the stranded wire: the diameter uniformity of the stranded wire, whether there is a snake, lack of root, jumping phenomenon are all in this performance, ② and the line model is generally composed of two semicircles, steel die hole chrome plating, also can use hard wood model, ③ and the line model is to make the stranded wire core diameter forming, and the hole diameter of the line model is slightly smaller than the calculated diameter 0.1~0.3mm is appropriate; D, tight pressing, tight pressing is mainly used for the insulation conductor stranded, bare wire generally not tight pressing, ① tight pressing purposes: a) increase the filling factor, reduce the conductor geometry, b) improve the conductor surface smoothness, uniform conductor surface electric field, c) reduce the opportunity to form a gap in the cable; ② tight pressing process: a) round stranded conductor tight pressing process is one, three vertical tight pressing, two, four horizontal tight pressing; one, two tight pressing 80%, three, four round tight pressing wheel, tight pressing 20%; round tight pressing conductor compared with non tight pressing conductor, the outer diameter can be reduced by 7.2~9.17%, the filling factor from 75% to 90~93%; b) 25~50mm 2 can only be vertical tight pressing; 70mm 2 and above the outermost layer of the conductor stranded after three tight pressing, namely vertical, horizontal, vertical tight pressing, the first tight pressing 85%, the second side of the shaping role, the third role of setting, tight pressing filling factor of the fan-shaped conductor can reach 90~93%.

5. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: In step 4, First, open the power setting parameters to the body, head warming, warming time according to the performance of the equipment, the type of plastic control, using XLPE extrusion, the temperature should be lower than the extrusion temperature, start to pay attention to the current table response; Then, according to the operation of the production notice to the conductive core or insulated core or cable core structure size and appearance quality inspection, unqualified conductor, insulated core, cable core shall not be on the car production, according to the production of model specifications to select the corresponding mold, and preliminary check the distance between the mold core, mold, put 60 before the die head filter screen in the die head and machine body connection, according to the production of products to adjust the traction speed, and empty running to see if it is normal, from the water tank to the reel pre pull good traction rope, and in the traction wheel around 3-4, track traction, should be adjusted according to the type of product pressure; Finally, the discharge check whether the extruded plastic plasticization is good, the surface is smooth, according to the situation, adjust the temperature to make it stable to the process requirements of the product appearance, fine tuning the eccentricity of the mold, double color extrusion machine should be opened before the main machine, open the auxiliary machine, make the color layering clear, two machine normal before extruding double color production, double color line can be divided into four type extrusion and two type extrusion, open the water tank water valve, make the water appropriate, the wire or insulated core or cable core through the mold core and the traction line firmly connected, start the main machine and traction machine, using extrusion die should be extruded a certain length 2-3 meters, do a good job of marking stop check eccentricity, and further adjust the mold core, using extrusion tube type die extrusion should be adjusted in the discharge mold core.

6. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: In step 8, (1) the core identification and arrangement order of the wire, A, power cable, ① two cores: red, blue or using digital code 1.0; ② three cores: red, yellow, green or using code 1, 2, 3; ③ four cores: red, yellow, green, blue or digital code 1.2.3.0; ④ five cores: red, yellow, green, blue, black or using 1.2.3.4.0 or can use 1.2.3.4.5, wherein, 0 represents the neutral core or the grounding insulated core, green / yellow represents the grounding insulated core, 10mm 2 The cross-linked polyethylene insulated core of 10mm 2 can be identified and recognized by the corresponding color tape. B, control cable, ① control cable cable core identification color or using digital coding, the outermost can use a yellow / green double color line, the digital coding core line sequence: from inside to outside clockwise direction, from 1 to arrange in turn; ② control cable insulation core color spectrum, 1) two core cable no optimal use of color spectrum; 2) three core cable: yellow / green, blue, brown, or blue, black, brown; 3) four core cable: yellow / green, blue, black, brown, or blue, black, brown, black or brown; 4) five core cable: yellow / green, blue, black, brown, black or brown, or blue, black, brown, black or brown, black or brown; 5) more than five core cable: in the outer layer a core is yellow / green, a core is blue, the other insulation core is the same color, but not green, yellow, light blue or brown; in other layers, a core is brown, the other insulation core is the same color, but not green, yellow, light blue or brown; again in other layers a core is brown, the other insulation core is the same color, but not green, yellow, light blue or brown; C, the core identification and arrangement of PVC insulated PVC sheathed wire cable with rated voltage 450 / 750V and below shall be carried out according to GB / T 5023-2008 and JB / T 8734-2016 standards respectively; D, the insulated core of computer cable and other special cable shall be arranged according to the corresponding chromatography confirmation method or the production notice.

7. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1 or 6, characterized in that: The step 8 is generally completed by using multiple modes, 1) the first pressing mode has a diameter larger than the cable core diameter by 1.0-2.5mm, which only plays a folding role and does not make the fan-shaped turn over; 2) the second pressing mode has a diameter smaller than the cable core diameter by 0-0.6mm, which plays a first tight pressing role; 3) the third pressing mode has a diameter smaller than the cable diameter by 0-0.4mm, which plays a shaping role, and the shorter the distance between the wrapping tape and the wrapping tape mold, the tighter the cable.

8. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 7, characterized in that: In the step 8, the fan-shaped and tile-shaped cable cabling outer diameter calculation formula, 1) D=R×2, wherein D represents the cabling outer diameter, and R represents the height of the insulated core; 2) D=Mh(2 cores), wherein D represents the cabling outer diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 3) D=Mh(3 cores), wherein D represents the cabling outer diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 4) D=Mh(4 cores), wherein D represents the cabling outer diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 5) D=Mh(3+1 cores), wherein D represents the cabling outer diameter, M represents the outer diameter ratio empirical coefficient, and h represents the fan-shaped height; 6) D=2h+d(4+1, 3+2, five cores), wherein D represents the cabling outer diameter, h represents the tile thickness, and d represents the small circle diameter; 7) D=2.154h+d(4+1, 3+2, five cores), wherein D represents the cabling outer diameter, h represents the tile thickness, and d represents the small circle diameter.

9. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: In the step 9, the same disc cable only allows to use one specification thickness of steel strip, and the two layers of steel strips are both gap wrapped, the wrapping direction is right, the wrapping should be tight and flat, the overlapping rate of the upper and lower two layers of steel strips should be not less than 25% of the width of the steel strip, the wrapping gap should be not greater than 50% of the width of the steel strip, the steel strip welding must be lap welding, the steel strip joint should be cut at an angle of 45°, the angle should be parallel to the cable axial direction after wrapping, the joint overlaps 3-10mm, the joint surface should be repaired flat and firm, the joint edge should not have burrs, sharp corners and other phenomena; the steel strip armor wrapping should be tight and cannot have the phenomenon of missing wrapping, the steel strip with defects such as inclusion, burr, sand inclusion and rust should be removed, the steel strip wrapping tension should be controlled, the maximum tension is when the disc is full, otherwise the steel strip is easy to fly out; the tension should be adjusted when the disc is half, otherwise the cable will be damaged or the steel strip will be curled to damage the cable core.

10. The method of producing a polyvinyl chloride power cable with extruded insulation according to claim 1, characterized in that: The circle diameter size is determined according to the product specification and length size of the formed circle, and the formed circle shape size is consistent with the same specification and length size each time; wherein the circle length is 100 m, the deviation is not more than ±0.5 m, the length measurement uses a meter counter, the short section with a length not less than 10 m is allowed to be delivered, the number of which is not more than 10% of the total length of delivery, and each short section should not be more than 5 sections.

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