CN117317775A - Hot melting manufacturing method for intermediate joint of copper core power cable - Google Patents
Hot melting manufacturing method for intermediate joint of copper core power cable Download PDFInfo
- Publication number
- CN117317775A CN117317775A CN202311201538.4A CN202311201538A CN117317775A CN 117317775 A CN117317775 A CN 117317775A CN 202311201538 A CN202311201538 A CN 202311201538A CN 117317775 A CN117317775 A CN 117317775A
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- Prior art keywords
- cable
- conductor
- copper
- insulation
- shield
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000002844 melting Methods 0.000 title claims abstract description 10
- 230000008018 melting Effects 0.000 title claims abstract description 10
- 239000004020 conductor Substances 0.000 claims abstract description 70
- 238000009413 insulation Methods 0.000 claims abstract description 50
- 229910052802 copper Inorganic materials 0.000 claims abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 29
- 238000003466 welding Methods 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 8
- 238000004073 vulcanization Methods 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 abstract description 4
- 230000005684 electric field Effects 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000002788 crimping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/28—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for wire processing before connecting to contact members, not provided for in groups H01R43/02 - H01R43/26
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Terminals (AREA)
Abstract
The invention provides a hot melting manufacturing method of a copper core power cable intermediate joint, which comprises the following steps: stripping the copper shield and the insulating shield on the pretreated cable to expose the cable conductor; abutting another cable conductor to finish conductor welding to obtain a welded cable; conducting insulation recovery and insulation shielding treatment on the conductor exposed on the welded cable; and adding a grounding wire on each of the three phases of the cable after the insulation shielding, fixing the grounding wire and the copper net on copper shields at two ends of the cable together by using a constant force spring to obtain the cable after the grounding treatment, and performing waterproof treatment. The invention adopts the hot melting technology to connect the conductor cores into a whole, has lower resistivity and strong conductivity, overcomes the problems of uneven geometric shape, concentrated electric field distribution and easy insulation breakdown of the cable after connection, simultaneously improves the tensile strength of the power cable connection point, avoids the problem of node looseness caused by long-term stress of the cable, and prolongs the service life of the power cable.
Description
Technical Field
The invention relates to the technical field of cable wiring, in particular to a hot melting manufacturing method of a copper core power cable intermediate joint.
Background
Currently, power cables are used in large quantities in power transmission and transformation projects of power systems. Depending on the actual conditions such as the supply length and the construction wiring, a large number of cable intermediate joints must be used for connection in cable construction. At present, electric power fittings with different specifications are commonly used for mechanical crimping, but the following hidden dangers exist in the mechanical crimping:
1. the connection pipe is not tightly crimped, and the connection point is heated and oxidized;
2. the wire core is easily damaged in the crimping process, and the current-carrying capacity is insufficient;
3. the tensile strength is low;
4. forming a weak point under high current impact erosion;
5. the electric field distribution is more concentrated, and the breakdown explosion is easy;
6. the insulation treatment process is limited, so that the insulation treatment process is easy to wet and water is easy to enter, and breakdown discharge is caused;
7. the service life of the insulating material is short, and the insulating material needs to be replaced periodically, so that the cable length is insufficient, and the later use is influenced.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a hot melting manufacturing method of a copper core power cable intermediate joint.
In order to achieve the above object, the present invention provides the following solutions:
a hot melting manufacturing method of a copper core power cable intermediate joint comprises the following steps:
step 1: stripping the outer sheath, armor and inner sheath of the cable, and separating three phases of the cable to obtain a pretreated cable;
step 2: stripping copper shielding and insulating shielding with preset lengths on the pretreated cable to expose a cable conductor;
step 3: abutting another cable conductor to finish conductor welding to obtain a welded cable;
step 4: performing insulation recovery treatment on the conductor exposed on the welded cable to obtain an insulation recovered cable;
step 5: performing insulation shielding treatment on the cable subjected to insulation recovery to obtain an insulated and shielded cable;
step 6: adding a grounding wire on three phases of the cable after insulation shielding, and fixing the grounding wire and a copper net on copper shields at two ends of the cable together by using a constant force spring to obtain a cable after grounding treatment;
step 7: and performing waterproof treatment on the cable subjected to the grounding treatment to finish the manufacture of the cable intermediate joint.
Preferably, the step 1: stripping the outer sheath, armor and inner sheath of the cable and separating the three phases of the cable to obtain a pretreated cable, comprising:
step 1.1: straightening and sawing the end part of the cable, and cleaning the surface of the outer sheath;
step 1.2: stripping the outer sheath, armor and inner sheath of the cable, wrapping PVC adhesive tapes on the tops of all phases of the cable, and temporarily fixing the copper shield;
step 1.3: the three phases of the cable are separated, so that the phases can be completely butted.
Preferably, the step 2: stripping a copper shield and an insulating shield of a preset length from the pretreated cable to expose a cable conductor, comprising:
step 2.1: stripping a copper shield with a first preset length on the pretreated cable, and wrapping and fixing the end part of the copper shield by using a semi-conductive belt so as to prevent the copper shield from loosening;
step 2.2: stripping the insulation shield with a second preset length, trimming the tail end of the insulation shield into a small slope with the angle of 45 degrees, and polishing the insulation shield by using fine sand paper with the size of more than 600 meshes;
step 2.3: the 85mm length conductor was stripped off and the insulation shield was treated to a 50mm length taper and a 5mm conductor shield was exposed.
Preferably, the step 3: a cable after welding the conductors of another cable, comprising:
step 3.1: cleaning impurities on the conductor, and sleeving the copper net and the cold-shrink insulating tube into the cable lead;
step 3.2: fixing the cable lead, and ensuring that the conductor does not displace in the welding process;
step 3.3: abutting another cable conductor to align the abutting part, and ensuring that two sides of the welding part are on the same horizontal line;
step 3.4: welding the aligned conductors by using a welding flux to obtain welded conductors;
step 3.5: the polished and welded conductor has the same diameter as the wire core of the original conductor and has a smooth surface.
Preferably, the step 4: performing insulation recovery treatment on the conductor exposed on the welded cable to obtain an insulation recovered cable, including:
step 4.1: wrapping the exposed conductor on the welded cable by using a vulcanizing tape;
step 4.2: shrinking the cold-shrink insulating tube on the fully covered and wrapped vulcanized belt, and symmetrically cutting openings at two ends of the cold-shrink insulating tube;
step 4.3: after wrapping the cold-shrink insulating tube by using tinfoil paper, heating and vulcanizing by using a heating device;
step 4.4: after vulcanization is finished, the heating device is dismantled, natural cooling is carried out, and a vulcanized insulating layer is obtained;
step 4.5: after cooling is finished, removing the cold shrink insulating tube, checking the insulating state of the vulcanized insulating layer, irradiating the conductor with strong light, and judging whether the wire core in the vulcanized insulating layer is deviated or not;
step 4.6: and (3) treating and polishing the surface of the vulcanized insulating layer to make the surface smooth and flat, and obtaining the cable with recovered insulation.
Preferably, the step 5: performing insulation shielding treatment on the cable after insulation recovery to obtain an insulated and shielded cable, wherein the method comprises the following steps:
step 5.1: wiping the surface of a vulcanized insulating layer of the cable after insulating shielding, and uniformly coating insulating grease;
step 5.2: and the insulating shields at the two ends of the vulcanized insulating layer are lapped and wrapped with two layers of semiconductor conductive strips.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
compared with the prior art, the invention adopts the hot melting process to connect the conductor cores into a whole, thereby not only having lower resistivity and strong conductivity, but also overcoming the problems of uneven geometry, concentrated electric field distribution and easy insulation breakdown of the cable after connection, improving the tensile strength of the power cable connection point, avoiding the problem of node loosening caused by long-term stress of the cable, and prolonging the service life of the power cable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for manufacturing an intermediate joint of a copper core power cable by hot melting;
FIG. 2 is a schematic view of a conductor saw provided by the present invention;
FIG. 3 is a schematic illustration of conductor polishing provided by the present invention;
FIG. 4 is a schematic diagram of a conductor weld provided by the present invention;
FIG. 5 is a schematic illustration of a welded conductor provided by the present invention;
fig. 6 is a diagram showing the effect of the conductor provided by the invention after insulation recovery.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to achieve the above object, the present invention provides the following solutions:
referring to fig. 1-6, a method for manufacturing an intermediate joint of a copper core power cable by hot melting includes:
step 1: stripping the outer sheath, armor and inner sheath of the cable, and separating three phases of the cable to obtain a pretreated cable;
further, the step 1 includes:
step 1.1: straightening and sawing the end part of the cable, and cleaning the surface of the outer sheath;
step 1.2: stripping the outer sheath, armor and inner sheath of the cable, wrapping PVC adhesive tapes on the tops of all phases of the cable, and temporarily fixing the copper shield;
step 1.3: the three phases of the cable are separated, and each phase is bent at the bifurcation as much as possible, so that each phase can be completely butted.
Step 2: stripping a copper shield and an insulating shield of a preset length on the pretreated cable to expose a cable conductor, as shown in fig. 2;
further, the step 2 includes:
step 2.1: stripping a copper shield with a first preset length (A+50mm) on the pretreated cable, and wrapping and fixing the end part of the copper shield by using a semi-conductive tape so as to prevent the copper shield from loosening;
TABLE 1
| Cable section (mm) 2 ) | 50-630 |
| A(mm) | 300 |
(note: use of phase ribbon to make phase mark)
Step 2.2: stripping the insulation shield with the second preset length (A), trimming the tail end of the insulation shield into a small slope with the angle of 45 DEG, and polishing the insulation shield by using fine sand paper with the size of more than 600 meshes to ensure that the insulation shield and the cable insulation are in smooth transition;
step 2.3: the 85mm length conductor was stripped off and the insulation shield was treated to a 50mm length taper and a 5mm conductor shield was exposed.
Step 3: abutting another cable conductor to finish conductor welding to obtain a welded cable;
further, the step 3 includes:
step 3.1: cleaning impurities on the conductor, checking whether the conductor is oxidized, whether oil stains exist on the surface or not, and the like, and sleeving a copper mesh and a cold-shrink insulating tube into a cable lead;
step 3.2: fixing the cable lead, and ensuring that the conductor does not displace in the welding process;
step 3.3: abutting another cable conductor to align the abutting part, and ensuring that two sides of the welding part are on the same horizontal line;
step 3.4: welding the aligned conductors by using a welding flux to obtain welded conductors;
in practical application, the invention needs to put a preset welding flux into a special die, ignite the welding flux, melt a copper core conductor, blow the die by a blower, rapidly cool the die, take down the die after the die is cooled to normal temperature, check the welding state of the conductor, and finish welding when the welding state of the conductor is perfect.
Step 3.5: the polished and welded conductor has the same wire core diameter as the original conductor, smooth surface, no crack and no virtual welding, and the conductor is on the same horizontal line.
Step 4: performing insulation recovery treatment on the conductor exposed on the welded cable to obtain an insulation recovered cable;
further, the step 4 includes:
step 4.1: wrapping the exposed conductor on the welded cable by using a vulcanizing tape;
in practical application, the conductor shielding with exposed two ends is firstly required to be lapped and wrapped by 4 layers by using the semiconductor vulcanized belt, then the insulating vulcanized belt is wrapped to 30mm behind the insulating conical surface with lapped two ends, and the outer diameter is more than 1.2 times of the outer diameter of the insulation.
Step 4.2: shrinking the cold-shrink insulating tube on the fully covered and wrapped vulcanized belt, and symmetrically cutting openings at two ends of the cold-shrink insulating tube, wherein the opening size is about 15 mm;
step 4.3: after wrapping the cold-shrink insulating tube by using tinfoil paper, heating and vulcanizing by using a heating device; the vulcanization process in the invention comprises the following steps: a section of vulcanization temperature of 165 DEG for 30 minutes; the second stage of vulcanization is carried out at 185 ℃ for 45 minutes, and heat preservation is needed during vulcanization.
Step 4.4: after vulcanization is finished, the heating device is dismantled, natural cooling is carried out, and a vulcanized insulating layer is obtained;
step 4.5: after cooling is finished, removing the cold shrink insulating tube, checking the insulating state of the vulcanized insulating layer, irradiating the conductor with strong light, and judging whether the wire core in the vulcanized insulating layer is deviated or not;
step 4.6: and (3) treating and polishing the surface of the vulcanized insulating layer to make the surface smooth and flat, and obtaining the cable with recovered insulation.
Step 5: performing insulation shielding treatment on the cable subjected to insulation recovery to obtain an insulated and shielded cable;
further, the step 5 includes:
step 5.1: wiping the surface of a vulcanized insulating layer of the cable after insulating shielding, and uniformly coating insulating grease;
step 5.2: and the insulating shields at the two ends of the vulcanized insulating layer are lapped and wrapped with two layers of semiconductor conductive strips.
Step 6: adding a grounding wire on three phases of the cable after insulation shielding, fixing the grounding wire and a copper net on copper shields at two ends of the cable together by using a constant force spring, and wrapping the constant force spring by using a PVC adhesive tape to obtain the cable after grounding treatment;
step 7: and performing waterproof treatment on the cable subjected to the grounding treatment to finish the manufacture of the cable intermediate joint.
Further, step 7 in the present invention includes:
step 7.1: the three phases are combined together to recover the retained filler, the inner sheath is wrapped by a wide PVC adhesive tape from the inner sheath to the inner sheath at the other end, and the waterproof tape is wrapped by a 1/2 lap joint mode.
Step 7.2: and (3) polishing the paint and the oxide layer of the armor belt, connecting the armors at the two ends by using a grounding wire, and fixing the armors by using a constant force spring.
Step 7.3: and packing glue is wrapped on the cable outer sheath and the constant force spring, a waterproof belt is wrapped from one end of the outer sheath to the other end of the outer sheath in a 1/2 lap joint mode, and the two ends of the waterproof belt are respectively lapped with the outer sheath by 60mm.
Step 7.4: the armor tape is wrapped outside the waterproof band in a 1/2 lap joint mode and fixed by PVC adhesive tape.
The invention makes various test contents for the cable intermediate joint, and specific test data are as follows:
1. power frequency voltage electrifying test: 39kv 5min, no breakdown meeting the requirements;
2. DC voltage energization test: 35kv 15min of non-breakdown meets the requirements;
3. partial discharge test at room temperature: the 15kv discharge amount is 4.2Pc, which meets the requirements;
4. impulse voltage test at high temperature: the positive and negative polarities of 95Kv are respectively 10 times, and the positive and negative polarities are not broken down, so that the requirements are met;
5. constant voltage load cycle test: at the voltage of 22kv and the conductor temperature of 95-100 ℃,30 times of circulation in air and 30 times of circulation in water are carried out, and each phase of the combined pattern is not broken down, so that the combined pattern meets the requirements; 6. and (3) checking: the filler, the strip and the key have no cracks, the main sealing part has no penetrability moist channel, no obvious overlooking and electric leakage trace, and the electric erosion phenomenon, and meets the requirements.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
compared with the prior art, the invention adopts the hot melting process to connect the conductor cores into a whole, thereby not only having lower resistivity and strong conductivity, but also overcoming the problems of uneven geometry, concentrated electric field distribution and easy insulation breakdown of the cable after connection, improving the tensile strength of the power cable connection point, avoiding the problem of node loosening caused by long-term stress of the cable, and prolonging the service life of the power cable.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In summary, the present description should not be construed as limiting the invention.
Claims (6)
1. The hot melting manufacturing method of the intermediate joint of the copper core power cable is characterized by comprising the following steps of:
step 1: stripping the outer sheath, armor and inner sheath of the cable, and separating three phases of the cable to obtain a pretreated cable;
step 2: stripping copper shielding and insulating shielding with preset lengths on the pretreated cable to expose a cable conductor;
step 3: abutting another cable conductor to finish conductor welding to obtain a welded cable;
step 4: performing insulation recovery treatment on the conductor exposed on the welded cable to obtain an insulation recovered cable;
step 5: performing insulation shielding treatment on the cable subjected to insulation recovery to obtain an insulated and shielded cable;
step 6: adding a grounding wire on three phases of the cable after insulation shielding, and fixing the grounding wire and a copper net on copper shields at two ends of the cable together by using a constant force spring to obtain a cable after grounding treatment;
step 7: and performing waterproof treatment on the cable subjected to the grounding treatment to finish the manufacture of the cable intermediate joint.
2. The method for manufacturing the intermediate joint of the copper core power cable according to claim 1, wherein the step 1: stripping the outer sheath, armor and inner sheath of the cable and separating the three phases of the cable to obtain a pretreated cable, comprising:
step 1.1: straightening and sawing the end part of the cable, and cleaning the surface of the outer sheath;
step 1.2: stripping the outer sheath, armor and inner sheath of the cable, wrapping PVC adhesive tapes on the tops of all phases of the cable, and temporarily fixing the copper shield;
step 1.3: the three phases of the cable are separated, so that the phases can be completely butted.
3. The method for manufacturing the intermediate joint of the copper core power cable according to claim 2, wherein the step 2: stripping a copper shield and an insulating shield of a preset length from the pretreated cable to expose a cable conductor, comprising:
step 2.1: stripping a copper shield with a first preset length on the pretreated cable, and wrapping and fixing the end part of the copper shield by using a semi-conductive belt so as to prevent the copper shield from loosening;
step 2.2: stripping the insulation shield with a second preset length, trimming the tail end of the insulation shield into a small slope with the angle of 45 degrees, and polishing the insulation shield by using fine sand paper with the size of more than 600 meshes;
step 2.3: the 85mm length conductor was stripped off and the insulation shield was treated to a 50mm length taper and a 5mm conductor shield was exposed.
4. A method for producing an intermediate joint for a copper-core power cable according to claim 3, wherein said step 3: a cable after welding the conductors of another cable, comprising:
step 3.1: cleaning impurities on the conductor, and sleeving the copper net and the cold-shrink insulating tube into the cable lead;
step 3.2: fixing the cable lead, and ensuring that the conductor does not displace in the welding process;
step 3.3: abutting another cable conductor to align the abutting part, and ensuring that two sides of the welding part are on the same horizontal line;
step 3.4: welding the aligned conductors by using a welding flux to obtain welded conductors;
step 3.5: the polished and welded conductor has the same diameter as the wire core of the original conductor and has a smooth surface.
5. The method for manufacturing the intermediate joint of the copper-core power cable according to claim 4, wherein the step 4: performing insulation recovery treatment on the conductor exposed on the welded cable to obtain an insulation recovered cable, including:
step 4.1: wrapping the exposed conductor on the welded cable by using a vulcanizing tape;
step 4.2: shrinking the cold-shrink insulating tube on the fully covered and wrapped vulcanized belt, and symmetrically cutting openings at two ends of the cold-shrink insulating tube;
step 4.3: after wrapping the cold-shrink insulating tube by using tinfoil paper, heating and vulcanizing by using a heating device;
step 4.4: after vulcanization is finished, the heating device is dismantled, natural cooling is carried out, and a vulcanized insulating layer is obtained;
step 4.5: after cooling is finished, removing the cold shrink insulating tube, checking the insulating state of the vulcanized insulating layer, irradiating the conductor with strong light, and judging whether the wire core in the vulcanized insulating layer is deviated or not;
step 4.6: and (3) treating and polishing the surface of the vulcanized insulating layer to make the surface smooth and flat, and obtaining the cable with recovered insulation.
6. The method for manufacturing the intermediate joint of the copper-core power cable according to claim 5, wherein the step 5: performing insulation shielding treatment on the cable after insulation recovery to obtain an insulated and shielded cable, wherein the method comprises the following steps:
step 5.1: wiping the surface of a vulcanized insulating layer of the cable after insulating shielding, and uniformly coating insulating grease;
step 5.2: and the insulating shields at the two ends of the vulcanized insulating layer are lapped and wrapped with two layers of semiconductor conductive strips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311201538.4A CN117317775A (en) | 2023-09-18 | 2023-09-18 | Hot melting manufacturing method for intermediate joint of copper core power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311201538.4A CN117317775A (en) | 2023-09-18 | 2023-09-18 | Hot melting manufacturing method for intermediate joint of copper core power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117317775A true CN117317775A (en) | 2023-12-29 |
Family
ID=89284120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311201538.4A Pending CN117317775A (en) | 2023-09-18 | 2023-09-18 | Hot melting manufacturing method for intermediate joint of copper core power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117317775A (en) |
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2023
- 2023-09-18 CN CN202311201538.4A patent/CN117317775A/en active Pending
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