CN113937589B - Cable connection construction process - Google Patents
Cable connection construction process Download PDFInfo
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- CN113937589B CN113937589B CN202111303172.2A CN202111303172A CN113937589B CN 113937589 B CN113937589 B CN 113937589B CN 202111303172 A CN202111303172 A CN 202111303172A CN 113937589 B CN113937589 B CN 113937589B
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- cable cores
- joint
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 title claims abstract description 12
- 238000003466 welding Methods 0.000 claims abstract description 72
- 210000001503 joint Anatomy 0.000 claims description 28
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 7
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- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 67
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 16
- 229910052802 copper Inorganic materials 0.000 description 16
- 239000010949 copper Substances 0.000 description 16
- 230000004927 fusion Effects 0.000 description 11
- 229910000838 Al alloy Inorganic materials 0.000 description 10
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- 239000004698 Polyethylene Substances 0.000 description 5
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- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
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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
- H01R43/02—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
Abstract
The invention discloses a cable connection construction process, which comprises the steps of firstly sleeving an intermediate joint on a pretreated cable core in advance, then melting and welding the cable cores at two ends together in a welding mould, and then moving the intermediate joint to the welding position of two cable cores and clamping and fixing the two cable cores to realize the connection of two cables; finally, the cable is restored and buried underground, so that the laying work can be completed, the process is simple, and the laying efficiency is high. The technical scheme of the invention effectively solves the problems of complex cable welding and laying process, unfixed cable connection structure and reduced transmission capacity in the prior art.
Description
Technical Field
The invention belongs to the technical field of cable connection, and relates to a cable connection construction process.
Background
With the definition of 'carbon reaching peak, carbon neutralization' target, new energy projects will keep a long-term high-speed development situation, and a power cable is an important component part of a wind-light electric field current collection circuit, but is easy to fail at a cable intermediate joint of the current collection circuit in the field. The electric field between the middle joint and the insulating layer is highly concentrated due to the thicker insulating layer of the 35KV aluminum alloy cable, so that great difficulty is brought to the safe operation of the buried cable.
Existing cable connectors can be divided into three types: the three cable joints have the problem of higher failure rate through analysis and comparison of field actual failures, mainly appear on the problems of incomplete crimping, creep deformation, enlarged contact resistance, tip of the surface of a connecting pipe, uncured sealing waterproof material, unsealed sealing and the like, and the wind-solar electric field aluminum cable adopts a direct-buried laying mode, wherein one cable joint may ignite other cables to cause accidents after failure and fire.
Stress cones are often provided between the edges of the cable metal jacket and the exterior of the wound insulation, which complicates the field installation process and only limitedly reduces the internal field strength. Meanwhile, bending and deformation are easy to occur at the cable welding position, a plurality of cable joints are concentrated together in a direct-buried laying mode of the wind-solar electric field aluminum cable, and negative influence benefits of the direct-buried laying mode can be amplified to reduce the flow guiding quantity and the transmission capacity, so that the overall reliability is affected.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the prior cable welding and laying process is complex, the cable connection structure is not firm, and the transmission capacity is reduced, and the cable connection construction process is provided, and an intermediate joint and a welding mould used in the process are provided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the cable connection construction process uses an intermediate joint and a welding die to weld and connect, and comprises the following specific steps:
(1) Exposing cable cores of the two cables;
(2) The middle joint is sleeved on one of the two cables;
(3) Welding two cable cores together in a welding mold;
(4) Moving the middle joint to the welding position of the two cable cores, and fastening the cable cores through the middle joint;
(5) Repairing two cables.
Wherein:
the welding mould comprises: the die body is provided with a plurality of cavities and a plurality of fixing structures, the plurality of fixing structures can fix the cable cores, and the plurality of cavities are used for providing the space required by welding the cable cores; the clamping structure, the cable core can be fixed in the clamping structure, and the clamping structure is movably arranged on the die body to adjust the distance between the cable cores.
The intermediate joint comprises: the connector comprises a connector body, a connector core, a connecting rod and a connecting rod, wherein a first through hole for penetrating a cable core is arranged in the axial direction, and one or more second through holes are arranged in the radial direction; the number of the compression bolts is consistent with that of the second through holes, the compression bolts are movably arranged in the second through holes, the cable cores are arranged in the first through holes, and the compression bolts can fix the cable cores on the inner wall of the connector main body so as to limit the cable cores to move in the main body.
In the step (3), two cable cores to be welded are placed into the die body, the end parts of the cable cores are clamped through the clamping structure, the positions of the cable cores are adjusted, and then welding is started.
In the step (4), the compression bolt is screwed down to further fasten the cable core at the welding position.
Further, the compression bolt includes fixed part, driven portion, pole portion and butt portion, and fixed part passes through screw structure detachably and sets up in the second through-hole, and pole portion passes through screw structure movably and sets up in fixed part, and butt portion sets up in pole portion towards the inside one end of joint main part and can contact with cable core, driven portion sets up the inside one end of joint main part in pole portion keeping away from.
Further, the abutting portion is movably disposed on the lever portion, and a surface of the abutting portion that can be in contact with the cable core is provided as a curved surface that is adapted to a surface of the cable core.
Further, the driven portion is detachably provided on the lever portion.
Further, the axial both ends of main part are provided with stress awl or stress ring, and cable core can wear to establish in stress awl or stress ring.
Further, a threaded groove or a plurality of annular grooves are axially formed in the hole wall of the first through hole.
Further, the clamping structure is movably arranged on the die body through a screw mechanism.
Further, be provided with reaction chamber, butt fusion chamber and weeping chamber in the mould body, the reaction chamber is used for adorning and is used for welded powder, and the tip of cable core can stretch into the butt fusion chamber and accomplish the welding, and weeping chamber setting is in butt fusion chamber below, and unnecessary welding material can drip to the weeping chamber through the butt fusion chamber in.
Further, the fixing structure in the die body is in a groove shape.
The invention has the beneficial effects that:
the middle connector is provided with the first through hole and the second through hole, the cable core which is integrally welded into a whole through fusion welding can be axially arranged in the first through hole in a penetrating mode, the second through hole is internally provided with the compression bolt, and the compression bolt can clamp and fix the cable core on the inner wall of the middle connector main body under the condition that the cable core is arranged in the first through hole in a penetrating mode, so that the cable connecting structure is firm and stable, and the transmission capacity is improved.
The welding mould can adjust the distance between the cable cores through the movable clamping structure, and is beneficial to improving the welding effect and the welding efficiency between the cable cores.
By applying the technical scheme of the invention, when the cable laying work is carried out on site, a worker only needs to sleeve the middle joint on the pretreated cable cores in advance, then the cable cores at the two ends are welded together in a welding mould in a melting way, and then the middle joint is moved to the welding positions of the two cable cores and clamped and fixed, so that the connection of the two cables can be realized. Finally, the cable is restored and buried underground, so that the laying work can be completed, the process is simple, and the laying efficiency is high.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a 35KV wind farm directly buried aluminum alloy cable in the prior art;
FIG. 2 is a schematic cross-sectional structural view of an embodiment of a welding die of the present invention;
FIG. 3 is an exploded view of the welding mold of FIG. 2;
fig. 4 is a schematic cross-sectional structural view of an embodiment of an intermediate joint of the present invention.
In the figure: 1 a cable core; 2 an inner semiconductive layer; 3 an insulating layer; 4 an outer semiconductive layer; 5 copper shielding layer; 6 an inner sheath layer; 7 armor layers; 8, an outer sheath layer; 9 reaction chamber; 10, isolating gaskets; 11 diversion trenches; a 12-screw mechanism; 13 a welding cavity; 14 a liquid leakage cavity; 15 driven parts; 16 fixing parts; 17 abutting portions; 18 stress ring; 19 thread-like grooves; 21 pole parts; 22 connector body.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and technical schemes.
It should be noted that, in the embodiments of the present invention, all directional indicators (such as up, down, left, right, front, and rear … …) are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Taking a 35KV wind power plant directly buried aluminum alloy cable as an example, as shown in fig. 1, the cable structure comprises a cable core 1, an inner semiconductive layer 2, an insulating layer 3, an outer semiconductive layer 4, a copper shielding layer 5, an inner sheath layer 6, an armor layer 7 and an outer sheath layer 8 from inside to outside. When two cables are connected, the outer protective layer is required to be peeled off according to preset requirements, the cable cores 1 of the cables are exposed to facilitate welding, and the two cable cores welded together are connected and fixed through the intermediate joint, so that the fracture and separation of the welding part are avoided, and the conveying effect of the cables is influenced.
As shown in fig. 4, the intermediate joint of the present embodiment includes a joint main body 22 and a compression bolt, wherein the joint main body 22 is provided with a first through hole for threading the cable core 1 in the axial direction and a second through hole in the radial direction; the compression bolt is movably arranged in the second through hole, and in case the cable core 1 is arranged in the first through hole as shown, the compression bolt can apply pressure to the cable core 1, clamping the cable core 1 on the inner wall of the joint body 22 to restrict the cable core 1 from moving in the joint body 22.
By applying the technical scheme of the invention, the middle joint is provided with the first through hole and the second through hole, the cable core which is integrally welded into a whole through fusion welding can be axially penetrated in the first through hole, the second through hole is internally provided with the compression bolt, and under the condition that the cable core 1 is penetrated in the first through hole, the compression bolt can clamp and fix the cable core 1 on the inner wall of the middle joint main body 22, so that the cable connection structure is firm and stable, and the transmission capacity is improved.
As shown in fig. 4, the inner wall of the main body 22 of the present embodiment is provided with a screw-like groove 19 in the axial direction of the first through hole, so that the intermediate joint can be fitted over the cable core in a rotating manner. After the welding work is finished, the middle joint can be retracted to the welding position in a rotating mode, so that two sides of the middle joint correspond to the end parts of the two cable cores respectively, and the operation is convenient. Simultaneously, screw thread form recess 19 forms concave-convex structure on the pore wall of first through-hole, has increased the frictional force between cable core and the intermediate head, can provide the resistance effectively when hold-down bolt compresses tightly cable core, plays the effect of restricting the removal of cable core.
In other embodiments not shown in the drawings, the screw-shaped grooves 19 may be replaced by a plurality of annular grooves, and the plurality of annular grooves may also form a concave-convex structure on the wall of the first through hole, so as to play a role in limiting the movement of the cable core when the compression bolt compresses the cable core.
As shown in fig. 4, the main body 22 of the present embodiment is provided with stress rings 18 at both axial ends, and the cable core 1 can be inserted in the stress rings 18. Because the electric field intensity distribution at the cable disconnection and the cable core connection is uneven and the field intensity is high, breakdown accidents are easy to occur, and because the section of the cable core connection is enlarged, the thickness and the dielectric constant of the additional insulation are different from those of the insulation of the cable body, the electric field distribution in the cable terminal and the middle joint is greatly changed compared with the electric field distribution in the cable, and the axial electric field intensity along the cable insulation surface direction, namely the axial stress, is mainly generated. There is therefore a need for a stress relief structure that addresses the above issues. The traditional stress cone is complex in structure and large in occupied space, and construction difficulty is increased to a certain extent. The middle joint of the embodiment adopts the stress ring 18, the stress ring 18 is made of nonlinear resistance materials, and the stress ring is different from a stress cone, so that the installation process is simplified, the occupied space is small, when the cable runs in engineering practice, an extremely small current is generated in the stress ring 18, and a linear voltage drop is correspondingly generated on the surface, so that the axial stress of the cable is reduced, the generation of corona is reduced, and the running life of the cable is further ensured.
As shown in fig. 4, the compression bolt of the present embodiment includes a fixing portion 16, a driven portion 15, a rod portion 21, and an abutment portion 17, the fixing portion 16 is detachably provided in the second through hole by a screw structure, the rod portion 21 is movably provided in the fixing portion 16 by a screw structure, and the abutment portion 17 is provided at an end of the rod portion 21 facing the inside of the main body 22 and capable of contacting the cable core 1, the driven portion 15 is provided at an end of the rod portion 21 facing away from the inside of the main body 22.
The fixing portion 16 may pre-fix the pressing bolt into the second through hole by a screw structure, and then press the abutting portion 17 against the cable core 1 by moving the lever portion 21.
As shown in fig. 4, the driven portion 15 may be designed as a polygon such as a hexagonal head of a bolt, may be designed as a groove structure such as a straight groove or a cross groove of a screw, or may be designed as another hollow structure for receiving and transmitting torque, so that the rod portion 21 can move in the fixing portion 16.
In order to make the outer surface of the intermediate joint relatively flat after completion of the construction, and to prevent distortion of the electric field, the driven portion 15 of the present embodiment is detachably provided on the lever portion 21. Specifically, the driven portion 15 may be pulled out from the rod portion 21 when the rod portion 21 is screwed to a certain position by a plug-in fit manner, so as to separate the two. Or when the torque between the driven part 15 and the rod part 21 is larger than a preset value, the driven part 15 and the rod part 21 are broken, so that the driven part 15 and the rod part 21 are separated.
As shown in fig. 4, the abutment portion 17 of the present embodiment is movably provided on the lever portion 21, and the surface of the abutment portion 17 that can be brought into contact with the cable core 1 is provided as a curved surface that is adapted to the surface of the cable core 1. The surface of butt portion 17 and the surface looks adaptation of cable core 1 have increased the area of contact between butt portion 17 and the cable core 1, are favorable to guaranteeing the compress tightly effect. The lever portion 21 is movable relative to the abutment portion 17, so that the abutment portion 17 can be kept stable relative to the cable core 1 when the lever portion 21 is screwed, and only pressure is provided, which is advantageous for the abutment portion 17 to be attached to the cable core 1.
The invention also provides a welding mould, as shown in fig. 2 and 3, the welding mould of the embodiment comprises a mould body and a clamping structure, wherein the mould body is provided with a plurality of chambers such as a reaction chamber 9, a welding chamber 13, a liquid leakage chamber 14 and the like, a plurality of groove-shaped fixing structures for positioning cable cores are further arranged in the mould body, and the cable cores are placed in the fixing structures and can be kept stable in the welding process. The welding powder is poured into the reaction cavity 9 firstly, after ignition reaction, the welding powder enters the welding cavity 13 through the diversion trench 11, the isolation gasket 10 is arranged at the bottom of the reaction cavity 9, namely at the inlet of the diversion trench 11, the end part of the cable core 1 can extend into the welding cavity 13, and the welding is completed when the welding powder falls into the space between the two cable cores 1. And cooling the cable core rapidly after the reaction is completed. And polishing the conductor after fusion welding to make the conductor equal in diameter with the cable core, and performing polishing treatment. The weeping chamber 14 is arranged below the welding chamber 13, and the surplus welding material can drip into the weeping chamber 14 through the welding chamber 13.
The welding mould still includes the clamp structure, and the clamp structure movably sets up on the mould body, and cable core 1 can be fixed in the clamp structure, just so can be favorable to improving the welding effect and the welding efficiency between the cable core 1 through removing the distance between clamp structure adjustment cable core 1.
The clamping structure of the present embodiment is movably provided on the mold body by a screw mechanism 12. The screw mechanism 12 can continuously and smoothly adjust the distance between the cable cores 1, and the adjustment accuracy is relatively high.
The invention also provides a cable connection construction process, which comprises the following specific process steps:
(1) And (3) cable treatment:
according to the technological requirements, the two sections of cables are stripped longitudinally from outside to inside according to the sequence of an outer sheath layer 8, an armor layer 7, an inner sheath layer 6, a copper shielding layer 5, an outer semiconductive layer 4, an insulating layer 3 and an inner semiconductive layer 2; wherein the short end of the outer sheath layer 8 is stripped about 700mm and the long end is stripped about 1100mm; the armor layer 7 is left to be about 20mm in length, and the rear port is sawn off; the inner sheath layer 6 is left to be about 50mm in length; the length of the stripped copper shielding layer 5 is A+50mm, and in order to prevent the copper shielding layer 5 from scattering, two layers of electrical adhesive tapes are wound at the fracture; stripping the outer semiconductive layer 4 about a long (a dimensions as in table 1); the outer semi-conductive layer 4 is smoothly transited to the insulating layer 3 by a blade chamfer 300 for fracture of the outer semi-conductive layer 4, and conductive particles and tool marks on the insulating surface are polished by an abrasive belt; cutting off the cable insulation layer 3 by using a rotary cutter, and stripping and cutting the insulation layer to be positioned at a distance of about 72mm from the shaft end; leaving the semiconductive layer 2 within about 2mm; the cable surface was sanded smooth and then the cable was cleaned.
TABLE 1
| Model number | 50-95 | 120-240 | 300-400 | 500-630 |
| Cross section suitable for use | 50/70/95 | 120/150/185/240 | 300/400 | 500/630 |
| A(mm) | 207 | 215 | 222 | 267 |
(2) Presetting a joint component:
the heat-shrinkable sleeve is sleeved from the end part of one cable to automatically slide onto the outer sheath layer 8, the heat-shrinkable sleeve is sleeved at the long end of the aluminum alloy cable, the copper shielding net is sleeved at the short end of the aluminum alloy cable, and the middle joint is sleeved from the end part of one cable.
(3) Connecting cable conductors:
step 1: and (5) melting. The water vapor on the surface of the cable is removed in advance, two aluminum alloy cable cores 1 to be welded are placed into the welding cavity 13, the screw rod mechanism 12 is screwed to fix the aluminum alloy cable cores 1 in parallel after the position of the cable is adjusted, the movement of a conductor is avoided, welding powder is placed in the reaction cavity 9, and after the ignition reaction, the welding powder passes through the diversion trench 11 and flows through the welding cavity 13 to weld the aluminum alloy cable cores. And cooling the cable core rapidly after the reaction is completed. And polishing the conductor subjected to fusion welding to make the conductor equal in diameter with the cable core, and performing polishing treatment.
Step 2: and (5) rotary feeding compaction. The intermediate joint is slid and wrapped around the aluminum alloy cable fusion welded portion, and the driven portion 15 is screwed with a specific tool to control the abutting portion 17 to abut against the cable core 1 and generate pressure thereto, thereby fastening the cable core 1.
(4) Restoring the inner semiconductive layer:
the surfaces of the cable core 1, the inner semiconductive layer 2 and the insulating layer 3 are cleaned by absolute ethyl alcohol, and the semiconductive polyethylene tape is wound from the outer side of one inner semiconductive layer 2 to the outer side of the other inner semiconductive layer 2 after being tensioned; to ensure that the middle joint is fully wrapped, two layers of semiconducting polyethylene tape are wrapped, while the crimp grooves are wrapped flat with semiconducting polyethylene tape, and the middle joint ends are wrapped with SRM-02 material.
(5) Restoring the insulating layer:
the crosslinked polyethylene main insulating tape with the insulating thickness consistent with that of the aluminum cable body is used for continuously, uniformly and tightly lapped and wound.
(6) Restoring the outer semiconductive layer:
cleaning the surface of the insulation repair layer by absolute ethyl alcohol, tensioning the semiconductive polyethylene tape, and wrapping the semiconductive polyethylene tape from the outer side of one outer semiconductive layer 3 to the outer side of the other outer semiconductive layer 3;
(7) Installing an intermediate main joint:
the heat-shrinkable sleeve is moved to the middle joint part from the position of the outer sheath layer 8, and is heated by an air gun aiming at the heat-shrinkable sleeve, and the heating mode is that the heat-shrinkable sleeve is heated at the central position of the heat-shrinkable sleeve first, so that the heat-shrinkable sleeve shrinks towards two sides. When the middle joint contracts, the cable is ensured to be flat.
(8) Restoring the copper shielding layer:
firstly, a copper shielding net is wound at the middle joint main body in a semi-lap joint mode, then the copper shielding net is externally coated with a piece of copper braided ground wire, the ends of the copper shielding net and the ground wire are fixed on a copper shielding layer 5 by using a constant force spring, and the copper shielding net and the ground wire are wound by using a white electrical adhesive tape to prevent a spring from loosening. A black flame retardant tape is used to wind from one end copper shield layer 5 to the other end copper shield layer 5.
(9) Restoring the inner sheath layer:
the surface of the inner sheath layer 6 is polished by using an abrasive belt, the inner sheath layer 6 is completely polished, the joint of the inner sheath layer 6 and the copper shielding layer 5 is filled with sealant, and the waterproof self-adhesive tape is wound from the outer side of one inner sheath layer 6 to the outer side of the other inner sheath layer 6 after being tensioned.
(10) Restoring the armor layer:
the outer packaging opening of the armor tape is opened by taking the rubber glove, so that the armor tape can be prevented from being hardened, and the armor tape after being packaged and opened can be soaked in water first and then used rapidly. The armor tape is half-lapped around approximately 150mm from one end of the armor layer 7 to the other and then rewound. The redundant armor tape is used for winding at the middle joint and the nearby cable to strengthen the protection until the matched armor tape is completely used up, and the ports of the armor tape are fixed by black flame-retardant adhesive tapes.
(11) Restoring the outer sheath layer:
the waterproof self-adhesive tape is wound from the outer side of one outer sheath layer 8 to the outer side of the other outer sheath layer 8 after being tensioned, and the heat shrinkage sleeve sleeved on the outer sheath layer 8 in advance is heated to shrink and then is tightly wrapped on the outer sheath layer 8.
By applying the technical scheme of the invention, when the cable laying work is carried out on site, a worker only needs to sleeve the middle joint on the pretreated cable cores in advance, then the cable cores at the two ends are welded together in a fusion mode, and then the middle joint is moved to the welding positions of the two cable cores and clamped and fixed, so that the connection of the two cables can be realized. Finally, the cable is restored and buried underground, so that the laying work can be completed, the process is simple, and the laying efficiency is high.
According to the requirements of cable raw materials, main body structures and specifications, the high-voltage shielding, insulation and outer shielding of the cable are combined in a fusion mode, and a cable electric field preset piece without a stress cone and an air gap interface is formed; the novel middle joint is adopted to fasten the melted aluminum cable conductor by using the rotary feeding compaction technology, and the connection mode increases the conductive sectional area so as to increase the conductivity of the aluminum alloy cable; the whole process flow has the advantages of preventing the aluminum cable from bending, creeping, oxidizing and wetting at welding spots and the like.
Claims (7)
1. The cable connection construction process is characterized by comprising the following specific steps of:
(1) Exposing cable cores of the two cables;
(2) The middle joint is sleeved on one of the two cables;
(3) Placing two cable cores to be welded into a die body, clamping the end parts of the cable cores through a clamping structure, adjusting the positions, then starting welding, and welding the two cable cores together in a welding die;
(4) Moving the middle joint to the welding position of the two cable cores, screwing up the compression bolt, further fastening the cable cores at the welding position, fastening the cable cores through the middle joint, and removing the driven part of the middle joint after fastening the cable cores;
(5) Repairing the two cables;
wherein:
the welding mould comprises:
the die comprises a die body, a plurality of fixing structures and a plurality of fixing structures, wherein the die body is internally provided with a plurality of cavities and a plurality of fixing structures, the plurality of fixing structures are used for fixing cable cores, and the plurality of cavities are used for providing space required by welding the cable cores;
the clamping structure is fixed in the cable cores and is movably arranged on the die body to adjust the distance between the cable cores;
the intermediate joint comprises:
the connector comprises a connector body, a connector core, a connecting rod and a connecting rod, wherein a first through hole for penetrating a cable core is arranged in the axial direction, and one or more second through holes are arranged in the radial direction;
the quantity is unanimous with the quantity of second through-hole, and movably sets up in the second through-hole, the cable core sets up in the first through-hole, hold-down bolt will the cable core is fixed on the inner wall of joint main part in order to restrict the cable core is in it removes in the joint main part, hold-down bolt includes fixed part, driven portion, pole portion and butt portion, fixed part passes through screw thread structure detachably and sets up in the second through-hole, pole portion passes through screw thread structure movably and sets up in the fixed part, butt portion sets up pole portion orientation joint main part inside one end and with the cable core contacts, driven portion sets up pole portion is kept away from joint main part inside one end, driven portion detachably sets up on the pole portion.
2. The process according to claim 1, wherein in the intermediate joint, the abutting portion is movably provided on the lever portion, and a surface of the abutting portion in contact with the cable core is provided as a curved surface adapted to a surface of the cable core.
3. The process according to claim 1 or 2, wherein in the intermediate joint, stress cones or stress rings are provided at both axial ends of the main body, and the cable core is inserted into the stress cones or stress rings.
4. The cable connection construction process according to claim 1 or 2, wherein in the intermediate joint, a threaded groove or a plurality of annular grooves are axially provided on the wall of the first through hole.
5. The cable connection construction process according to claim 1 or 2, wherein in the welding mold, the holding structure is movably provided on the mold body by a screw mechanism.
6. The process according to claim 1 or 2, wherein in the welding mold, a reaction chamber, a welding chamber and a liquid leakage chamber are provided in the mold body, the reaction chamber is used for containing the powder for welding, the end portion of the cable core extends into the welding chamber to finish welding, the liquid leakage chamber is provided below the welding chamber, and the redundant welding material is dripped into the liquid leakage chamber through the welding chamber.
7. The process according to claim 1 or 2, wherein the fixing structure is in a groove shape in the welding mold.
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| CN114312389B (en) * | 2022-01-30 | 2024-01-30 | 郑州恒天铜业有限公司 | New energy automobile fills electric pile with cable and coupling equipment that have waterproof function |
| CN116727950B (en) * | 2023-08-09 | 2023-10-13 | 宝牌电缆实业有限公司 | Cable conductor connects welding equipment |
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