CN114050518A - Manufacturing process of 66kV-500kV cable middle wrapping fusion type soft joint - Google Patents
Manufacturing process of 66kV-500kV cable middle wrapping fusion type soft joint Download PDFInfo
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- CN114050518A CN114050518A CN202111351875.2A CN202111351875A CN114050518A CN 114050518 A CN114050518 A CN 114050518A CN 202111351875 A CN202111351875 A CN 202111351875A CN 114050518 A CN114050518 A CN 114050518A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 230000004927 fusion Effects 0.000 title description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 71
- 238000003466 welding Methods 0.000 claims abstract description 34
- 238000004804 winding Methods 0.000 claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 29
- 238000005493 welding type Methods 0.000 claims abstract description 16
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 12
- 238000000746 purification Methods 0.000 description 10
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000009740 moulding (composite fabrication) Methods 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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Abstract
The invention discloses a manufacturing process of a lapping and welding type soft joint in the middle of a 66kV-500kV cable, which comprises the following steps: a. welding a conductor, b, recovering the inner shielding layer, manually winding the lining semi-conductive cloth at the conductor wire core, then winding the inner shielding strip onto the lining semi-conductive cloth, and heating the inner shielding strip to melt and mold the inner shielding strip; c. recovering the insulating layer, manually winding the insulating tape at the position of the inner shielding layer, and heating the insulating tape to melt and mold the insulating tape; d. the outer shielding layer is recovered, the outer shielding strip is manually wound at the insulating layer, and the outer shielding strip is heated, so that the outer shielding strip is melted and formed; e. and (4) recovering the metal shielding layer, firstly winding the semi-conductive water-blocking tape outside the outer shielding layer, and installing a lead sleeve. The invention provides a manufacturing process of a lapping and welding type soft joint in the middle of a 66kV-500kV cable, which has the advantages of simple structure, low cost, high quality and convenience in manufacturing, and can be directly applied outdoors.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a manufacturing process of a 66kV-500kV cable middle lapping and welding type soft joint.
Background
The cable is a bridge between the power supply equipment and the electric equipment, plays a role in power transmission and is widely applied. Modern life and production cannot be isolated from electric power, and therefore, cables cannot be isolated. With the widespread use of cables, the number of required cable accessories is increasing and the quality is also increasing.
In the laying process of the cable, when the length of the cable is smaller than the laying length, two or more sections of cables are required to be connected, so that conductor wire cores of the cables are communicated to form a continuous cable. The joint for cable connection must have certain insulating and sealing performance, accords with the electrical insulation regulation, and is rational in infrastructure, meets requirements such as environment. Therefore, the construction and the quality of the joint are directly related to the stable and reliable performance of the operation of the cable line.
In the prior art, the insulation layer of the cable is recovered by injection molding of a mold, and during manufacturing, extrusion molding and vulcanization waiting time are needed, so that the manufacturing time is long, and micropores of the insulation layer cannot be discharged in an iron drum device in the vulcanization process; the insulating layer at the joint is poor in use effect, so that the restoration technology is only applicable to low-voltage cables below 66kV, and if high-voltage cables above 66kV are restored, the joint cannot bear high voltage due to the problems of micropores and the like.
In addition, the requirement of cable butt joint is generally found in the outdoor cabling process, however, in the prior art, the restoration of the inner shielding layer and the outer shielding layer of the cable also needs to adopt a mold, so that the restoration of the cable joint position needs an extruding machine, a vulcanizing device and a plurality of sets of molds, the occupied area is large, the equipment is inconvenient to carry, the equipment is generally fixedly arranged in a room, so the cable can not be in butt joint in a construction site in time, in addition, in the restoration process of the insulating layer, the temperature and the humidity in the air and the impurities in the air need to be strictly controlled, so a plurality of equipment need to run simultaneously to meet the standard requirement, however, the equipment is more and difficult to carry, some large-scale equipment can not be placed in a small space, so a room is generally independently arranged as a purifying room, the equipment is arranged in the purifying room, and then the middle joint is manufactured in the purifying room, this also results in the inability to dock the cables at the job site in a timely manner.
Disclosure of Invention
Aiming at the defects of the prior art, the manufacturing process of the lapping and welding type soft joint in the middle of the 66kV-500kV cable is provided, the structure is simple, the cost is low, the quality is high, the manufacturing is convenient, and the process can be directly applied outdoors.
In order to achieve the above object, the present invention provides the following technical solutions.
A manufacturing process of a lapping and welding type soft joint in the middle of a 66kV-500kV cable comprises the following steps:
a. conductor welding, wherein conductor wire cores of two sections of high-voltage cables are welded together by welding;
b. recovering the inner shielding layer, manually winding the inner-lining semi-conductive cloth at the conductor wire core, then winding an inner shielding strip onto the inner-lining semi-conductive cloth, wherein the manufacturing material of the inner shielding strip is the same as that of the inner shielding layer in the high-voltage cable, winding a heating element onto the inner shielding strip, and heating the inner shielding strip to melt and mold the inner shielding strip so as to form the inner shielding layer;
c. recovering the insulating layer, cleaning the processed inner shielding layer, manually winding the insulating tape at the inner shielding layer, winding a heating element to the insulating tape, and heating the insulating tape to melt and mold the insulating tape so as to form the insulating layer;
d. recovering the outer shielding layer, cleaning the previously processed insulating layer, manually winding an outer shielding strip at the insulating layer, wherein the manufacturing material of the outer shielding strip is the same as that of the outer shielding layer in the high-voltage cable, winding a heating element on the outer shielding strip, and heating the outer shielding strip to melt and mold the outer shielding strip so as to form the outer shielding layer;
e. and (4) recovering the metal shielding layer, firstly winding the semi-conductive water-blocking tape outside the outer shielding layer, and installing a lead sleeve.
The invention has the beneficial effects that: the manufacturing process of the invention comprises the steps of manufacturing the same material of the inner shielding layer in the cable body to form an inner shielding strip, manually wrapping the inner shielding strip outside a conductor, winding the inner shielding strip outside the inner shielding strip through a heating element, heating and melting the inner shielding strip to form, recovering the inner shielding layer, manually winding an insulating tape, winding the insulating tape outside the insulating tape through the heating element, heating and melting the insulating tape to form, recovering the insulating layer, finally manufacturing the same material of the outer shielding layer in the cable body to form an outer shielding strip, manually wrapping the outer shielding strip outside the conductor, winding the outer shielding strip outside the outer shielding strip through the heating element, heating and melting the outer shielding strip to form, recovering the outer shielding layer, compared with the mode of recovering the mould in the prior art, the method for directly winding the heating element to heat, eliminating the mould structure and being simple to process, can directly carry out the operation in the open air, the recovery of insulating layer moreover, for current mould extrusion molding's scheme, the manual mode of wrapping of this application for laminating is inseparable between insulating band and the internal shield layer, can eliminate the micropore, can be synthetic with the internal shield layer, insulating layer, the butt fusion of external shield layer of cable high-voltage joint department, thereby can be the closest by body characteristic, the functional performance is good, makes joint department can bear 66kV-500 kV's high pressure.
In the step a, conductor welding points are manufactured by adopting argon arc welding or gas welding technology, so that two sections of conductor cores of the high-voltage cable are welded together, and the welding points are polished smooth after welding, so that the outer diameter of the welding position is equal to the outer diameter of the conductor of the original cable.
In the step b, after the inner shielding strip is wound, the outer surface of the inner shielding strip is wrapped with a teflon tape and tinfoil, and the tinfoil is heated by a heating element to heat the inner shielding strip; in the step c, after the insulating tape is wound, the polytetrafluoroethylene tape and the tinfoil are wound outside, and the tinfoil is heated by a heating element to heat the insulating tape; in the step d, after the outer shielding strip is wound, the outer surface of the outer shielding strip is wrapped with the tetrafluoro belt and the tinfoil, and the reheating element heats the outer shielding strip by heating the tinfoil. Through the improvement, the tin foil conducts heat, so that the inner shielding strip, the insulating tape and the outer shielding strip are heated more uniformly.
As a modification of the present invention, in the steps b, c, and d, the heating element includes a heating tape and a heating wire disposed in the heating tape, and the heating tape is wound around the tinfoil to heat the tinfoil, and heat is conducted through the tinfoil. Through the improvement, the heating element is convenient to wind on the tin foil.
In the step b, the step c and the step d, a temperature control thermocouple is placed in the middle of the cable joint for temperature detection, and when the temperature reaches a specified temperature, the heating belt stops heating and keeps warm. Through the improvement, the temperature control is convenient to implement, and the heat preservation is carried out.
As an improvement of the invention, in the step b, polishing treatment is carried out on the inner shielding layer after the melting molding; in the step c, grinding and polishing the fused and molded insulating layer; in step d, the outer shield layer after melt molding is subjected to polishing treatment.
As an improvement of the invention, in step e, the semi-conductive water-blocking tape is wrapped in a semi-lap joint mode.
As an improvement of the invention, in the step e, the lead sleeve is sleeved outside the semi-conductive water blocking belt, one end of the lead sleeve is welded with the lead pipe of one section of the high-voltage cable, then the lead sleeve is pulled to a required outer diameter, the other end of the lead sleeve is welded with the lead pipe of the other section of the high-voltage cable, and after the lead sleeve is welded, welding points at two ends are wound by the water blocking belt.
In step e, the lead sleeve is wound and wrapped outside the semi-conductive water-blocking tape, and the lead sleeve and a lead pipe in the original high-voltage cable are completely sealed by heating a lead bar by using a spray gun.
As an improvement of the invention, the insulating layer is restored in the purification table, the purification table comprises a supporting seat and an operation table arranged on the supporting seat, the left side and the right side of the operation table are provided with through holes for the high-voltage cables to pass through, the joints are positioned in the operation table, the front side of the operation table is provided with an operation hole for hands to extend into, the cables are manually operated through the operation hole, the front side of the operation table is provided with a transparent plate for observation, and a dehumidifier for adjusting humidity, an air conditioner for adjusting temperature and a purifier for purifying air are arranged in the operation table.
As an improvement of the invention, the supporting seat comprises a supporting table surface and supporting legs arranged on the periphery, the operating table is arranged on the supporting table surface, the lower end of the supporting table surface is provided with a height adjusting mechanism, the height adjusting mechanism comprises a base, a first supporting frame, a second supporting frame and an operating assembly, the front side beam and the rear side beam of the base are transversely provided with sliding grooves, the operating assembly comprises a moving rod, a transmission block and a rotating screw rod, the moving rod is arranged in the sliding grooves in a sliding manner, the transmission block is arranged on the moving rod, the transmission block is provided with a threaded hole, the rotating screw rod penetrates through the left side beam of the base and is matched with the transmission block through the threaded hole, the upper end of the first supporting frame and the upper end of the second supporting frame are respectively and rotatably connected with the supporting table surface, the lower end of the first supporting frame is rotatably connected with the base, and the lower end of the second supporting frame is connected with the moving rod, the first support frame and the second support frame are arranged in a scissor-type cross mode, and the bottom of the base is provided with a moving wheel.
Drawings
Fig. 1 is a schematic structural view of the cable of the present invention.
FIG. 2 is a schematic view of the structure of the clean bench of the present invention (front view).
FIG. 3 is a schematic view (left side view) of the purification stage of the present invention.
Fig. 4 is a schematic view of the base and operating assembly cooperating structure of the present invention.
In the figure, 1, a high-voltage cable; 11. a conductor; 12. an inner shield layer; 13. an insulating layer; 14. an outer shield layer; 2. a clean bench; 21. a supporting seat; 22. an operation table; 221. an operation port; 222. a penetration port; 23. a base; 231. a moving wheel; 232. a chute; 24. a first support frame; 25. a second support frame; 26. a travel bar; 27. a transmission block; 28. rotating the screw; 29. the handle is operated.
Detailed Description
The invention is further explained with reference to the drawings.
Referring to fig. 1, the manufacturing process of the lapping and welding type soft joint in the middle of the 66kV-500kV cable comprises the following steps:
a. and (2) welding the conductors 11, welding the conductor 11 wire cores of the two sections of the high-voltage cables 1 together by welding, and adopting a conductor 11 welding point manufactured by an argon arc welding or gas welding technology to weld the conductor 11 wire cores of the two sections of the high-voltage cables 1 together, and polishing the welding point smoothly after welding so that the outer diameter of the welding part is equal to the outer diameter of the conductor 11 of the original cable.
b. The inner shielding layer 12 is recovered, the inner shielding semi-conductive cloth is manually wound at the core of the conductor 11, then the inner shielding strip is wound on the inner shielding semi-conductive cloth, wherein the manufacturing material of the inner shielding strip is the same as that of the inner shielding layer 12 in the high-voltage cable 1, in the embodiment, the inner shielding strip is made of the semi-conductive material, after the inner shielding strip is wound, a polytetrafluoroethylene tape and a tin foil are wound outside the inner shielding strip, then the heating tape is wound on the tin foil, wherein an electric heating wire is arranged in the heating tape, so that the heating tape can be heated more uniformly, heat is conducted to the inner shielding strip through the tin foil, the heat conduction effect is good, then a temperature control thermocouple is placed in the middle of a cable joint for temperature detection, when the temperature reaches a specified temperature, the heating tape stops heating, and is kept warm for a period of time, so that the inner shielding strip is melted and molded, thereby forming the inner shield layer 12; and the tetrafluoro belt is arranged, so that when the tinfoil is damaged, the tetrafluoro belt can protect the tinfoil, the molten inner shielding strip is prevented from overflowing, and the inner shielding layer 12 is polished after being molten and formed.
c. The insulating layer 13 is recovered, the processed inner shielding layer 12 is cleaned, an insulating tape is manually wound at the position of the inner shielding layer 12, a heating element is wound to the insulating tape, a polytetrafluoroethylene tape and a tin foil are wound outside the insulating tape, then the heating tape is wound on the tin foil, an electric heating wire is arranged in the heating tape, the heating tape can be heated more uniformly, heat is conducted to the insulating tape through the tin foil, the heat conduction effect is good, a temperature control thermocouple is placed in the middle of a cable connector for temperature detection, when the temperature reaches a specified temperature, the heating tape stops heating, the temperature is kept for a period of time, and the insulating tape is formed in a melting mode, so that the insulating layer 13 is formed; the PTFE tape is arranged, so that when the tinfoil is damaged, the PTFE tape can be protected, the molten insulating tape is prevented from overflowing, and the insulating tape is polished after being molten and formed; and the insulation layer 13 is restored in the purification platform 2, as shown in fig. 2 to 4, the purification platform 2 comprises a support base 21 and an operation platform 22 arranged on the support base 21, the left and right sides of the operation platform 22 are provided with a through hole 222 for the high-voltage cable 1 to pass through, the joint is positioned in the operation platform 22, the front side of the operation platform 22 is provided with an operation hole 221 for a hand to extend into, the cable is operated manually through the operation hole 221, the front side of the operation platform 22 is provided with a transparent plate for observation, the operation platform 22 is internally provided with a dehumidifier for adjusting humidity, an air conditioner for adjusting temperature and a purifier for purifying air, the insulation layer 13 is restored in the purification platform 2, the dehumidifier is used for adjusting humidity, the air is adjusted by the air conditioner for adjusting temperature, the purifier is used for purifying air, so as to effectively reduce impurities and water vapor in the air when the insulation tape is wound, thereby guarantee insulating layer 13 operation stability after recovering, reduce the fault rate of puncture, the integrated level is high moreover, and equipment takes up an area of for a short time, conveniently carries, only needs a clarification plant just can reach the purifying effect of clean room, clarification plant can directly use outdoors to can directly dock the cable at the job site, improve work efficiency, in addition, supporting seat 21 includes the supporting bench face and sets up in supporting legs all around, operation panel 22 sets up on the supporting bench face, the lower extreme of supporting bench face is equipped with height adjusting mechanism, height adjusting mechanism includes base 23, first support frame 24 and second support frame 25 and operating module, and base 23 is the rectangular frame form, and the front and back curb girder of base 23 is equipped with spout 232 respectively, and spout 232 is horizontal setting, operating module includes carriage release lever 26, convenient carrying, The movable support comprises a transmission block 27 and a rotary screw 28, one end of a movable rod 26 is positioned in a sliding groove 232 of a front side beam of a base 23, the other end of the movable rod 26 is positioned in the sliding groove 232 of a rear side beam of the base 23, so that the movable rod 26 can transversely move along the sliding groove 232, the transmission block 27 is fixedly arranged on the movable rod 26, a threaded hole is formed in the transmission block 27, a mounting hole is formed in a left side beam of the base 23, one end of the rotary screw 28 is positioned outside the mounting hole and is provided with an operating handle 29, the other end of the rotary screw penetrates through the mounting hole and the threaded hole, the rotary screw 28 is matched with the transmission block 27 through the threaded hole, the upper end of a first support frame 24 and the upper end of a second support frame 25 are respectively rotatably connected with a support table top, the lower end of the first support frame 24 is rotatably connected with the base 23, the lower end of the second support frame 25 is connected with the movable rod 26, and the first support frame 24 and the second support frame 25 are arranged in a scissor-type intersection manner, the bottom of the base 23 is provided with a moving wheel 231. When the operation handle 29 is rotated, the transmission block 27 is driven to move through the thread fit, and when the transmission block 27 moves, the moving rod 26 is driven to move along the sliding groove 232, so that the second support frame 25 rotates to adjust the angle between the first support frame 24 and the second support frame 25, and finally the height of the base 23 and the moving wheel 231 is adjusted. When the purification platform 2 needs to be fixed, when the movable wheel 231 is adjusted into the support seat 21, the movable wheel 231 is far away from the ground, at this time, the purification platform 2 is fixed through the support seat 21, when the purification platform 2 needs to be moved, the movable wheel 231 is adjusted to move downwards to be moved out of the support seat 21, the movable wheel 231 is made to be in contact with the ground, and therefore the purification platform 2 can be pushed to move through the movable wheel 231.
d. The outer shielding layer 14 is recovered, the outer lining semi-conductive cloth is manually wound at the wire core of the conductor 11, then the outer shielding strip is wound on the outer lining semi-conductive cloth, wherein the manufacturing material of the outer shielding strip is the same as that of the outer shielding layer 14 in the high-voltage cable 1, in the embodiment, the outer shielding strip is made of the semi-conductive material, after the outer shielding strip is wound, a tetrafluoro belt and tin foil are wound outside the outer shielding strip, then the heating belt is wound on the tin foil, wherein the heating belt is externally provided with an electric heating wire, so that the heating belt can be heated more uniformly, heat is conducted to the outer shielding strip through the tin foil, the heat conduction effect is good, then a temperature control thermocouple is placed in the middle of a cable joint for temperature detection, when the temperature reaches the designated temperature, the heating belt stops heating, and is kept warm for a period of time, so that the outer shielding strip is melted and molded, thereby forming the outer shield layer 14; the tetrafluoro belt is arranged, so that when the tinfoil is damaged, the tetrafluoro belt can protect the tinfoil, the molten outer shielding strip is prevented from overflowing, and the outer shielding layer 14 is polished after being molten and formed.
e. The metal shielding layer resumes, at first with the winding of semi-conductive waterproofing tape to outer shielding layer 14 outside, semi-conductive waterproofing tape adopts half overlap joint mode to wrap, need level closely when wrapping, installs the lead sheath again, dwindles the cable with the pyrocondensation pipe at last, wherein the lead sheath has two kinds of mounting means: specifically, one of the mounting methods is as follows: sleeving a lead sleeve outside the semi-conductive water-blocking belt, welding one end of the lead sleeve with a lead pipe of one section of the high-voltage cable 1, drawing the lead sleeve to a required outer diameter, welding the other end of the lead sleeve with a lead pipe of the other section of the high-voltage cable 1, and winding welding points at two ends with the water-blocking belt after the lead sleeve is welded; the other installation mode is as follows: and winding and wrapping the lead sleeve outside the semi-conductive water blocking belt, and then heating the lead strip by using a spray gun to completely seal the lead sleeve with the lead pipe in the original high-voltage cable 1 and seal a gap of the lead sleeve.
The manufacturing process of the invention comprises the steps of manufacturing an inner shielding strip by the same material of an inner shielding layer 12 in a cable body, manually wrapping the inner shielding strip outside a conductor 11, winding the inner shielding strip outside the inner shielding strip by a heating element, heating, melting and forming the inner shielding strip, recovering the inner shielding layer 12, manually winding an insulating tape, winding the insulating tape outside the insulating tape by the heating element, heating, melting and forming the insulating tape, recovering an insulating layer 13, finally manufacturing an outer shielding strip by the same material of an outer shielding layer 14 in the cable body, manually wrapping the outer shielding strip outside the conductor 11, winding the outer shielding strip outside the outer shielding strip by the heating element, heating, melting and forming the outer shielding strip, recovering the outer shielding layer 14, compared with the prior art that the heating element is directly wound for heating, the heating element is cancelled, processing is simple, can directly carry out the operation in the open air, and insulating layer 13's recovery, for current mould extrusion molding's scheme, the manual mode of wrapping that winds of this application for the laminating is inseparable between insulating band and the internal shield layer 12, can eliminate the micropore, can be synthetic with the internal shield layer 12, insulating layer 13, the 14 butt fusion of external shield layer of cable high-voltage joint department, thereby can be the body characteristic closest, the performance is good, makes joint department can bear 66kV-500 kV's high pressure.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (10)
1. The manufacturing process of the lapping and welding type soft joint in the middle of the 66kV-500kV cable is characterized in that: the method comprises the following steps:
a. conductor welding, wherein conductor wire cores of two sections of high-voltage cables are welded together by welding;
b. recovering the inner shielding layer, manually winding the inner-lining semi-conductive cloth at the conductor wire core, then winding an inner shielding strip onto the inner-lining semi-conductive cloth, wherein the manufacturing material of the inner shielding strip is the same as that of the inner shielding layer in the high-voltage cable, winding a heating element onto the inner shielding strip, and heating the inner shielding strip to melt and mold the inner shielding strip so as to form the inner shielding layer;
c. recovering the insulating layer, cleaning the processed inner shielding layer, manually winding the insulating tape at the inner shielding layer, winding a heating element to the insulating tape, and heating the insulating tape to melt and mold the insulating tape so as to form the insulating layer;
d. recovering the outer shielding layer, cleaning the previously processed insulating layer, manually winding an outer shielding strip at the insulating layer, wherein the manufacturing material of the outer shielding strip is the same as that of the outer shielding layer in the high-voltage cable, winding a heating element on the outer shielding strip, and heating the outer shielding strip to melt and mold the outer shielding strip so as to form the outer shielding layer;
e. and (4) recovering the metal shielding layer, firstly winding the semi-conductive water-blocking tape outside the outer shielding layer, and installing a lead sleeve.
2. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: in the step a, conductor welding points are manufactured by adopting argon arc welding or gas welding technology, so that two sections of conductor cores of the high-voltage cable are welded together, and the welding points are polished smooth after welding, so that the outer diameter of the welding position is equal to the outer diameter of the conductor of the original cable.
3. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: in the step b, after the inner shielding strip is wound, the outer surface of the inner shielding strip is wrapped with the PTFE tape and the tinfoil, and the inner shielding strip is heated by heating the tinfoil through the heating element; in the step c, after the insulating tape is wound, the polytetrafluoroethylene tape and the tinfoil are wound outside, and the tinfoil is heated by a heating element to heat the insulating tape; in the step d, after the outer shielding strip is wound, the outer surface of the outer shielding strip is wrapped with the tetrafluoro belt and the tinfoil, and the reheating element heats the outer shielding strip by heating the tinfoil.
4. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 3, wherein the manufacturing process comprises the following steps: in the steps b, c and d, the heating element comprises a heating belt and a heating wire arranged in the heating belt, and the heating belt is wound on the tin foil so as to heat the tin foil and conduct heat through the tin foil.
5. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 4, wherein the manufacturing process comprises the following steps: in the steps b, c and d, a temperature control thermocouple is placed in the middle of the cable joint for temperature detection, and when the temperature reaches a specified temperature, the heating belt stops heating and keeps warm.
6. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: in the step b, polishing the fused and molded inner shielding layer; in the step c, grinding and polishing the fused and molded insulating layer; in step d, the outer shield layer after melt molding is subjected to polishing treatment.
7. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: and e, wrapping the semi-conductive water-blocking tape in a semi-lap joint mode.
8. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: and e, sleeving the lead sleeve outside the semi-conductive water blocking belt, welding one end of the lead sleeve with a lead pipe of one section of the high-voltage cable, drawing the lead sleeve to a required outer diameter, welding the other end of the lead sleeve with a lead pipe of the other section of the high-voltage cable, and winding the welding points at the two ends with waterproof belts after the welding of the lead sleeve is completed.
9. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: and e, winding and wrapping the lead sleeve outside the semi-conductive water blocking belt, and heating the lead strip by using a spray gun to completely seal the lead sleeve and the lead pipe in the original high-voltage cable.
10. The manufacturing process of the 66kV-500kV cable intermediate lapping and welding type soft joint as claimed in claim 1, characterized in that: in step c, the insulating layer recovers in the clean bench, the clean bench includes the supporting seat and sets up the operation panel on the supporting seat, the left and right sides of operation panel is equipped with the mouth that wears that high-tension cable passes, and joint department is located the operation panel, the front side of operation panel is equipped with the operation mouth that supplies the hand to stretch into, and the manual work is operated the cable through the operation mouth, just the front side of operation panel is equipped with the transparent plate that is used for observing, be equipped with in the operation panel and be used for adjusting the dehumidifier of humidity, be used for the air conditioner of temperature regulation, be used for air-purifying's clarifier.
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| CN2021111205645 | 2021-09-24 | ||
| CN202111120564 | 2021-09-24 |
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| CN202111351875.2A Active CN114050518B (en) | 2021-09-24 | 2021-11-16 | Manufacturing process of 66kV-500kV cable middle wrapping welding type soft joint |
| CN202111351872.9A Pending CN114050517A (en) | 2021-09-24 | 2021-11-16 | Manufacturing process of middle wrapping fusion type soft joint of three-core cable |
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Cited By (2)
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| CN115133467A (en) * | 2022-06-29 | 2022-09-30 | 宁波东方电缆股份有限公司 | Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint |
| CN115149469A (en) * | 2022-06-29 | 2022-10-04 | 宁波东方电缆股份有限公司 | Manufacturing process of ultrahigh-voltage direct-current 525kV wrapping fusion type soft joint |
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Also Published As
| Publication number | Publication date |
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| CN114050518B (en) | 2024-05-28 |
| CN114050517A (en) | 2022-02-15 |
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