CN100555784C - A kind of preparation method of twisted polyethylene cable connecting hose - Google Patents
A kind of preparation method of twisted polyethylene cable connecting hose Download PDFInfo
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- CN100555784C CN100555784C CNB2007100687589A CN200710068758A CN100555784C CN 100555784 C CN100555784 C CN 100555784C CN B2007100687589 A CNB2007100687589 A CN B2007100687589A CN 200710068758 A CN200710068758 A CN 200710068758A CN 100555784 C CN100555784 C CN 100555784C
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Abstract
The invention discloses a kind of preparation method of twisted polyethylene cable connecting hose, semi-conductive layer and metallic sheath pipe in comprising, be welded to each other between the core of two cables and constitute the core connecting portion, interior semi-conductive layer is reserved section with the cable internal shield and is combined, characteristics are that interior semi-conductive layer is outside equipped with polyethylene filling and vulcanization insulating barrier, the polyethylene layer of polyethylene filling and vulcanization insulating barrier and cable vulcanizes fusion mutually, polyethylene filling and vulcanization insulating barrier two ends are provided with the outer transition linkage section of polyethylene layer that is coated on cable, polyethylene filling and vulcanization insulating barrier is outside equipped with the outer shielding layer of cable and reserves the outer semiconducting layer that section combines, the outer surface of the two ends of metallic sheath pipe and the plumbous pillar of cable is welded to each other, the two ends of metallic sheath pipe are provided with the slope linkage section, advantage is to make the structure of cable flexible joint to reduce the existence of impurity and air gap as much as possible, no matter be electric property or mechanical performance, all have clear improvement and improve.
Description
Technical field
The present invention relates to a kind of cable joint, especially relate to a kind of preparation method of twisted polyethylene cable connecting hose.
Background technology
Existing twisted polyethylene cable often needs long length in use, and because the restriction of manufacturing technology, the length of unit cable is subjected to certain restriction.Because the length of unit cable is not enough, therefore need many cables are coupled together, and the connection of present twisted polyethylene cable usually uses connecting hose to finish.In order to guarantee that whole cable has good electric property, just require connecting hose to possess the good electric property the same with the body of twisted polyethylene cable.The structure of traditional joint is varied, and wherein result of use is preferably connecting hose.But the manufacture craft of the cable intermediate joint of present various structures mainly contains six kinds of patterns such as wrapped banding pattern, casting type, moulding type, proplasm, prefabrication type and pre-refrigeration shrinkage type.Wherein wrapped banding pattern, casting type technology, because of labor strength is big, physical dimension is big, or reason such as electric property is relatively poor, seldom is used for the manufacturing of seabed crosslinked cable factory connecting hose.Though prefabrication type and pre-refrigeration shrinkage type transition joint electric property are better, field fabrication technology is simpler, and structural volume is too big, also is not suitable for and makes seabed cross linked insulation power cable factory connecting hose.
Moulding type joint technology system adopts the crosslinked polyethylene shrink belt for preparing in advance, carry out successively wrapped to the cross-linked cable insulating layer that needs joint, impose certain pressure and temperature again to recovering wrapped crosslinked polyethylene shrink belt recure, make it to be solidified into one, finish the recovery of the crucial production process insulating barrier of cross linked insulation power cable connecting hose with crosslinked cable body insulation welding.But, in the crosslinked polyetylene insulated band manufacturing process of this kind, carry into pollutant unavoidably secretly just because of the crosslinked polyethylene shrink belt that must adopt in the moulding type joint technology; In the process of making moulding type joint lapped insulation band, must carry into air in certain amount gap secretly simultaneously; Therefore moulding type joint technology only is applicable to and makes other cross linked insulation power cable factory connecting hose of the following level of mesolow.
Though and the connecting hose electric property that proplasm joint technology is made is best, but because production process complexity, long construction period, the general proplasm joint of making one group of three-phase needs 3～4 time-of-weeks, and the site environment to construction is strict, engineers and technicians' operative skill level of making joint is had relatively high expectations, and the technological equipment that needs is also more.Thereby proplasm piecer technology does not obtain real utilization as yet in recent years.
Summary of the invention
Technical problem to be solved by this invention provides a kind of preparation method of simple in structure, the twisted polyethylene cable connecting hose that can reach the electric property the same with the crosslinked cable body.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of preparation method of twisted polyethylene cable connecting hose, may further comprise the steps: 1. expose core behind the insulating barrier of stripping cable two ends, clean oven dry back, back with absolute ethyl alcohol and adopt the silver soldering welding to form the core connecting portion; 2. the cross linked insulation layer with the both sides, joint cuts into coniform, internal shield is set in the end of circular cone reserves section, with core connecting portion cleaning, drying, wrapped two-layer with the inner shield semi-conductive tape of getting ready then in the piece mode, and put up internal shield and reserve section, load onto inner shield copper and press mould and heat, vulcanize, the cold finishing of polishing after solid forms interior semi-conductive layer; 3. the reagency awl is set in the end of cable, the cable of handling well fixedly is put into the two ends of insulation shaping mould, described insulation shaping mould comprises a metal outer mold and a flexible liner mould, be provided with the springform expansion space between described metal outer mold and the described flexible liner mould, the temperature of insulation shaping mould inner chamber is risen to 105 ℃, with extruder the crosslinked polyethylene base-material is filled in the insulation shaping mould then flash is all arranged to two ends, temperature Deng the insulation shaping mould is reduced to room temperature, take out cable and put into curing tube, charge into nitrogen after getting rid of the air in the curing tube, vulcanize being higher than under 200 ℃ nitrogen temperature and the condition greater than the 1.2MPa nitrogen pressure, form insulating barrier, after cable is taken out in the venting release, the two ends of insulating barrier are repaired the transition linkage section that forms the level and smooth inclination outside the polyethylene layer that is coated on cable; 4. after surface of insulating layer being made the cleaning dried, be provided with the outer shielding layer of cable and reserve the outer semiconducting layer that section combines, and the root of transition linkage section and the zone between the plumbous pillar are filled and led up; 5. outside semiconductor layer surface with the wrapped layer of metal band of gap mode, with the outer surface of metal tape two ends and plumbous pillar oxyhydrogen flame firm welding, form the metallic sheath pipe, with oxyhydrogen flame the solder side at metallic sheath pipe two ends is put in order then and formed the slope linkage section.
The mode of layering welding is adopted in the welding of step in 1., and every layer of solder joint staggers mutually.
The setting of the outer semiconducting layer of step in 4. may further comprise the steps: at first the semiconductive japanning is spread upon surface of insulating layer and oven dry uniformly, then that ACP semiconductive self-adhesive tape is wrapped in the mode of partly putting up, the outer shielding layer of two ends and cable body is reserved the section overlap joint, again at the wrapped semiconductor waterstop of outermost layer.
The curing tube of step in 3. adopts the seamless stainless steel pipe manufacturer of wall thickness 6mm, described curing tube two-port is connected with cooling water, the two ends of described sulfuration tube are provided with the high-strength high-elasticity rubber sealing boot that matches with cable joint two ends to be vulcanized, and are provided with the pad sealing gasket between upper and lower mould.
Described flexible liner mould is the rubber liner mould.
Compared with prior art, the invention has the advantages that polyethylene filling and vulcanization insulating barrier is set outside interior semi-conductive layer, the polyethylene layer of polyethylene filling and vulcanization insulating barrier and cable vulcanizes fusion mutually, make the structure of cable flexible joint reduce the existence of impurity and air gap as much as possible, the connecting hose of this structure also can reach the electric property that is close with the crosslinked cable body preferably; And use method of the present invention, the time of one group of high-voltage cross-linking polythene cable transition joint of actual fabrication three-phase was foreshortened to about 48 hours, the joint of producing almost with external diameters such as former cable; The present invention has eliminated the conductor that exists in the conventional method and the void defects between the semi-conductive tape, eliminated the air gap defective between semi-conductive tape and the insulating barrier, creepage effect defective that air gap produced between the insulating barrier of having eliminated two ends reagency awl zone in the conventional method and having augmented, the connecting hose that the inventive method is made, no matter be electric property or mechanical performance, all have clear improvement and improve.
Adopt the advantage of rubber liner extrusion molding mould to be: (1) its crosslinked polyethylene material change in volume that can inject in company with extrusion molding and elastic expansion, and crosslinked material remained certain pressure, cool off contraction process gradually at the crosslinked material that injects, the elasticity of rubber pattern is followed its synchronous again, has given a certain amount of volume compensation function; (2) the rubber pattern thermal resistance is bigger, makes the outer cooling of cross-linked polyethylene insulating material of injection moulding slow, and internal layer is very fast near the position cooling of metallic conductor, has guaranteed correct cooling order, has therefore guaranteed that crosslinked material inside can not produce the shrinkage cavity blemish.
Adopt metal pattern to press forming process and make interior semi-conductive layer, abandoned traditional wrapped belt inner shield restoration methods, because the interior semi-conductive layer tissue tight that metal pattern presses that moulding process recovers, the top layer rounding is level and smooth, there is not the void defects between the semi-conductive tape screen of plain conductor and winding in the twining package tape pattern in it, and because the recovery of semi-conductive layer in the impacted process, what adopt is to expect with a kind of semicrystalline polyolefin conduction with cable body, merges tight, no air gap between the extrusion molding insulating barrier that the interior semi-conductive layer of recovery and later stage are filled up; Curing tube adopts the seamless stainless steel pipe manufacturer of wall thickness 6mm, can bear the pressure of 1.6Mpa and 280 ℃ high temperature; The curing tube two-port is connected with cooling water, and high temperature is scalded the cable body structure in the time of can preventing the joint sulfuration; The two ends of sulfuration tube are provided with the high-strength high-elasticity rubber sealing boot that matches with cable joint two ends to be vulcanized, between upper and lower mould, be provided with the pad sealing gasket, can guarantee the Cross-Linked Polythene Cable Joints of making, when the high nitrogen pressure sulfuration of high temperature, be unlikely to the explosion of leaking gas; The mode of layering welding is adopted in welding, and every layer of solder joint staggers mutually, can avoid the joint area part to increase thick and distortion, helps following one critical process---the recovery of semi-conductive layer in the lead; Adopt the oxyhydrogen flame welding between metal tape two ends and the plumbous pillar, the cable heated area is little, and local temperature is not high, can not scald cable.
Description of drawings
Fig. 1 is the structural representation of connecting hose of the present invention;
Fig. 2 is the structural representation of the insulation shaping mould that uses in the manufacture method of the present invention;
Fig. 3 is the structural representation of the sulfuration tube that uses in the manufacture method of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one: as shown in Figure 1, a kind of connecting hose of twisted polyethylene cable, comprise the interior semi-conductive layer 3 outside the core connecting portion 2 that is arranged on two cables 1 and be arranged on outmost lead sheath pipe 4, at core connecting portion 2 places, be welded to each other between the core 11 of two cables, interior semi-conductive layer 3 is reserved section 12 with the cable internal shield and is combined, interior semi-conductive layer 3 is outside equipped with polyethylene filling and vulcanization insulating barrier 5, polyethylene filling and vulcanization insulating barrier 5 is formed by polyethylene material filling and vulcanization, polyethylene filling and vulcanization insulating barrier 5 vulcanizes fusion mutually with the polyethylene layer 13 of cable, polyethylene filling and vulcanization insulating barrier 5 two ends are provided with the transition linkage section 51 outside the polyethylene layer 13 that is coated on cable, polyethylene filling and vulcanization insulating barrier 5 is outside equipped with the outer shielding layer of cable and reserves section 14 outer semiconducting layers that combine 6, the outer surface of the plumbous pillar 15 of the two ends of lead sheath pipe 4 and cable is welded to each other, and the two ends of lead sheath pipe 4 are provided with slope linkage section 7.
Embodiment two: the preparation method of the connecting hose of the twisted polyethylene cable among the embodiment one, may further comprise the steps: 1. expose core 11 behind the insulating barrier 13 of stripping cable 1 two ends, after absolute ethyl alcohol cleaning, oven dry, adopt the silver soldering welding to form core connecting portion 2, the mode of layering welding is adopted in welding, every layer of solder joint staggers mutually, and the requirement of mechanical strength of welding position is not less than 170N/mm
22. the cross linked insulation layer 13 with the both sides, joint cuts into coniform, when waiting to bore the end progressively near internal shield, use the sheet glass scraping instead, note trying not the scratch inner shield, after waiting to expose interior semi-conductive layer, the about 15 millimeters ends at circular cone of internal shield that keep the awl end are provided with internal shield and reserve section 12, with core connecting portion 2 cleaning, dryings, wrapped two-layer with the inner shield semi-conductive tape of getting ready then in the piece mode, and put up internal shield and reserve section 12, note putting up 10 millimeters with the conductor shielding of awl end reservation, loading onto inner shield copper presses mould and heats, sulfuration, the cold finishing of polishing after solid is with the blade burr of pruning, use P240 respectively, the P400 abrasive band is bright and clean with the internal shield polishing that recovers, rounding, semi-conductive layer 3 in forming; 3. the reagency awl is set in the end of cable 1, remove the outer shielding layer of one section cable insulation, the out semiconductor layer of insulation divides easily to be peeled off, peelable and not peelable three classes, if easily peel off semi-conductive layer, insulation screen divests more convenient, available blade is at the along the circumferential direction standardized vestige in size place of regulation, again along cable several roads vestige that axially rows dry, tool marks can not be dark, in order to avoid scuffing insulating barrier, peel off semi-conductive layer immediately blocks ofly, if common peelable outer shielding layer, sometimes divest difficulty, after the available liquefied gas flame gun heating, row is peeled off again, if not peelable semi-conductive layer, then can only adopt little planing tool and sheet glass, dig the back shaving earlier and remove the insulation outer shielding layer, to injure insulating barrier less when noting operation as far as possible, generally be controlled in 0.2 millimeter, reagency is bored the instrument or the planing tool processing of available similar pencil volume cutter, after the basic size again with sheet glass subtly shaving be shaped, use P100, the high cementation of P240 carborundum fillet, the zone polishing of reagency awl is bright and clean, wrapped up the processing district with food fresh keeping membrane after disposing, and tie up a waddy, prevent cable connector district bending distortion to be recovered, damage manufactured semi-finished product, the cable of handling well fixedly is put into the two ends of insulation shaping mould 100, insulation shaping mould 100 comprises a metal outer mold 101 and a rubber liner mould 102, be provided with springform expansion space 103 between metal outer mold 101 and the rubber liner mould 102, the temperature of insulation shaping mould 100 inner chambers is risen to 105 ℃, with extruder crosslinked polyethylene base-material (the crosslinked material of Kolding, Shanghai 35kV) is filled in the insulation shaping mould 100 then flash is all arranged to two ends, temperature Deng insulation shaping mould 100 is reduced to room temperature, take out cable 1 and put into curing tube 200, curing tube 200 adopts the seamless stainless steel pipe manufacturer of wall thickness 6mm, curing tube 200 two-port are connected with cooling water 201, the two ends of sulfuration tube 200 are provided with the high-strength high-elasticity rubber sealing boot 202 that matches with cable joint two ends to be vulcanized, between upper and lower mould, be provided with pad sealing gasket 203, get rid of and to charge into nitrogen behind the air in the curing tube 200 and vulcanize being higher than under 200 ℃ of temperature and the condition greater than the 1.2MPa nitrogen pressure, form insulating barrier 5, after cable 1 is taken out in the venting release, the two ends of insulating barrier 5 are repaired the transition linkage section 51 that forms the level and smooth inclination outside the polyethylene layer 13 that is coated on cable 1; 4. after the cleaning dried being made on insulating barrier 5 surfaces, at first the semiconductive japanning is spread upon uniformly insulating barrier 5 surfaces and oven dry, then that ACP semiconductive self-adhesive tape is wrapped in the mode of partly putting up, the outer shielding layer of two ends and cable body is reserved section 14 overlap joints, again at the wrapped semiconductor waterstop of outermost layer, and the root of transition linkage section 51 and the zone between the plumbous pillar 15 filled and led up, just be provided with to have finished and reserve section 14 outer semiconducting layers that combine 6 with the outer shielding layer of cable 1; 5. outside semiconductor layer surface 6 with the wrapped one deck lead metal of gap mode band, outer surface oxyhydrogen flame firm welding with lead metal band two ends and plumbous pillar 15, form lead sheath pipe 4, with oxyhydrogen flame the solder side at lead sheath pipe 4 two ends is put in order and formed slope linkage section 7.
Claims (5)
1, a kind of preparation method of twisted polyethylene cable connecting hose may further comprise the steps: 1. expose core behind the insulating barrier of stripping cable two ends, clean, dry the back with absolute ethyl alcohol and adopt the silver soldering welding to form the core connecting portion; 2. the cross linked insulation layer with the both sides, joint cuts into coniform, internal shield is set in the end of circular cone reserves section, with core connecting portion cleaning, drying, wrapped two-layer with the inner shield semi-conductive tape of getting ready then in the piece mode, and put up internal shield and reserve section, load onto inner shield copper and press mould and heat, vulcanize, the cold finishing of polishing after solid forms interior semi-conductive layer; 3. the reagency awl is set in the end of cable, the cable of handling well fixedly is put into the two ends of insulation shaping mould, described insulation shaping mould comprises a metal outer mold and a flexible liner mould, be provided with the springform expansion space between described metal outer mold and the described flexible liner mould, the temperature of insulation shaping mould inner chamber is risen to 105 ℃, with extruder the crosslinked polyethylene base-material is filled in the insulation shaping mould then flash is all arranged to two ends, temperature Deng the insulation shaping mould is reduced to room temperature, take out cable and put into curing tube, get rid of and to charge into nitrogen behind the air in the curing tube and vulcanize being higher than under 200 ℃ of temperature and the condition greater than the 1.2MPa nitrogen pressure, form insulating barrier, after cable is taken out in the venting release, the two ends of insulating barrier are repaired the transition linkage section that forms the level and smooth inclination outside the polyethylene layer that is coated on cable; 4. after surface of insulating layer being made the cleaning dried, be provided with the outer shielding layer of cable and reserve the outer semiconducting layer that section combines, and the root of transition linkage section and the zone between the plumbous pillar are filled and led up; 5. outside semiconductor layer surface with the wrapped layer of metal band of gap mode, with the outer surface of metal tape two ends and plumbous pillar oxyhydrogen flame firm welding, form the metallic sheath pipe, with oxyhydrogen flame the solder side at metallic sheath pipe two ends is put in order and formed the slope linkage section.
2, the preparation method of a kind of twisted polyethylene cable connecting hose as claimed in claim 1 is characterized in that the mode that the welding during step 1. adopts layering to weld, and every layer of solder joint staggers mutually.
3, the preparation method of a kind of twisted polyethylene cable connecting hose as claimed in claim 1, the setting that it is characterized in that the outer semiconducting layer during step 4. may further comprise the steps: at first the semiconductive japanning is spread upon surface of insulating layer and oven dry uniformly, then that ACP semiconductive self-adhesive tape is wrapped in the mode of partly putting up, the outer shielding layer of two ends and cable body is reserved the section overlap joint, again at the wrapped semiconductor waterstop of outermost layer.
4, the preparation method of a kind of twisted polyethylene cable connecting hose as claimed in claim 1, the seamless stainless steel pipe manufacturer that it is characterized in that the curing tube employing wall thickness 6mm during step 3., described curing tube two-port is connected with cooling water, the two ends of described curing tube are provided with the high-strength high-elasticity rubber sealing boot that matches with cable joint two ends to be vulcanized, and are provided with the pad sealing gasket between upper and lower mould.
5, the preparation method of a kind of twisted polyethylene cable connecting hose as claimed in claim 1 is characterized in that described flexible liner mould is the rubber liner mould.
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| CNB2007100687589A CN100555784C (en) | 2007-05-22 | 2007-05-22 | A kind of preparation method of twisted polyethylene cable connecting hose |
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| CNB2007100687589A CN100555784C (en) | 2007-05-22 | 2007-05-22 | A kind of preparation method of twisted polyethylene cable connecting hose |
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| CN101068075A CN101068075A (en) | 2007-11-07 |
| CN100555784C true CN100555784C (en) | 2009-10-28 |
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Owner name: NINGBO DONGFANG CABLE CO., LTD. Free format text: FORMER OWNER: NINGBO DONGFANG CABLE CO., LTD.; APPLICANT Effective date: 20080201 |
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Effective date of registration: 20080201 Address after: Small town, Beilun District, Zhejiang City, Ningbo Province, China: 315801 Applicant after: Ningbo Orient Wires Cables Co., Ltd. Address before: Zhejiang Ningbo Ningbo Dongfang Cable Co., Ltd. (Xiaogang) postal code: 315801 Applicant before: Ningbo Oriental Cable Limited by Share Ltd Co-applicant before: Dongfang Group Co., Ltd., Ningbo |
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