CN102568701A - Production process and equipment for producing 10-35kV power cable by silane crosslinkable polyethylene - Google Patents
Production process and equipment for producing 10-35kV power cable by silane crosslinkable polyethylene Download PDFInfo
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- CN102568701A CN102568701A CN2012100284682A CN201210028468A CN102568701A CN 102568701 A CN102568701 A CN 102568701A CN 2012100284682 A CN2012100284682 A CN 2012100284682A CN 201210028468 A CN201210028468 A CN 201210028468A CN 102568701 A CN102568701 A CN 102568701A
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Abstract
The invention discloses a production process and equipment for producing a 10-35kV power cable by silane crosslinkable polyethylene. A semiconductive inner shielding material and the silane crosslinkable polyethylene material are subjected to extrusion molding onto a copper conductor by double-layer co-extrusion equipment to form a coating; then the coating is cooled; an outer conductive shielding material is coated on the coating by third extrusion equipment; and the obtained product is wrapped up after being cooled by a water pool and then is subjected to boiling sizing, so that the 10-35kV power cable is obtained. According to the production process and equipment of the invention, due to the adoption of a 2+1 process flow, not only is a certain compactness ensured between an outer shielding layer and a middle insulating layer, but also a certain strippability strength can be ensured between the outer shielding layer and the middle insulating layer, the 10-35kV power cable which is comparable to that produced on a CCV (Catenary Crosslinking Production Line) catenary unit by peroxide can be completely manufactured, and the investment cost, the production cost and the operation cost are all greatly lower than those in the existing production technology.
Description
Technical field
The present invention relates to a kind of production technology of power cable, refer to a kind of production technology and equipment of silane cross-linkable polyethylene production 10-35kV power cable especially.
Background technology
At present, the coating layer of producing the power cable outside adopts 3 big crosslinking process technology, i.e. peroxide crosslinking, crosslinked with silicane and radiation crosslinkings mostly; This three big crosslinking technological is owing to cut both ways; After development for over ten years, form peroxide crosslinking at present and occupied 10kV and above crosslinked cable market, 10kV and following power cable and aerial cable are main with crosslinked with silicane then; The radiation crosslinking material has high input owing to equipment; The limit property of product is bigger, and operating cost is big, therefore only on special cable more among a small circle, possesses advantage.
The outer electro-insulating rubber layer that coats of the copper core of 10kV and above power cable is generally three layers; Be internal shield near the copper core; Middle is insulating barrier, and outermost layer is an outer shielding layer, aborning it is required will closely to fuse for internal shield and insulating barrier; Outermost outer shielding layer will have certain tightness with middle insulating barrier, also will make things convenient in the use in the future and be convenient to peel off.Given this, adopt peroxide crosslinked polyethylene, than being easier to reach above requirement.
And the outer electro-insulating rubber layer that coats of the copper core of the power cable below the 10kV adopts silane cross-linkable polyethylene production generally with regard to one deck more.And this way temperature of charge higher (about 190 ℃) when extruding; It forms composite bed to be difficult to control; For the power cable more than the 10kV because the coating layer of product relates to extruding of 3 layer materials (semiconductive inner shield material, insulating material, outer conductive shield material); The insulating material of guaranteeing outermost outer conductive shield material and intermediate layer will have certain rippability intensity, and difficulty is bigger.
The production of 10kV to 35kV power cable is mainly still adopted peroxide to go up at CCV cross-linking production line (catenary crosslinking production line) up to now and is produced; As shown in Figure 1; The peroxide crosslinked polyethylene material through special-purpose three-layer co-extruded equipment 2 ' extrusion molding to copper core 1 ' on form coating layer; Stable through its rerum natura of about more than 100 meters long curing tube 3 ' make again; In sulfidation, need heat, pressurization and inflated with nitrogen, and then through 20 ~ 30 meters natural cooling (through cooling bath 4 '), carry out take-up afterwards again.Because therefore the extrusion temperature lower (about 120 ℃) of peroxide crosslinkable polyethylene material adopts three-layer co-extruded equipment can guarantee that outer shielding layer and intermediate insulating layer have certain tightness, have certain rippability again.
But adopt the CCV production line to have following defective:
1, factory building length is no less than 120 meters;
2, special-purpose three-layer co-extruded equipment joins input with factory building often more than 2,000 ten thousand yuan;
3, because production line reaches more than 100 meter, each produce be lost to rare up to a hundred meters cable waste;
Need consume nitrogen when 4, producing, therefore manufacture of materials cost per ton exceeds thousand yuan/ton at least than common extruder production line;
5, special-purpose peroxide crosslinkable polythene material is expensive more a lot of than silane cross-linkable polyethylene, and material cost is high.
Because input, operation and material cost are high; Numerous cable factories attempt using silane cross-linkable polyethylene instead and produce 10kV and 35kV power cable; But because this product relates to extruding of trilaminate material; And to guarantee that outer electric screen material and insulating material have certain rippability intensity, the therefore rippability intensity of conductive shield material outside the equipment of existing 3 layers of co-extrusion and technological process can't thoroughly guarantee all the time.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of silane cross-linkable polyethylene to produce the production technology and the equipment of 10-35kV power cable; Through this process equipment; Adopt silane cross-linkable polyethylene also can produce the power cable of 10-35kV, and can guarantee the rippability intensity of outer conductive shielding layer.
For solving the problems of the technologies described above, technical solution of the present invention is:
A kind of silane cross-linkable polyethylene is produced the production technology of 10-35kV power cable, comprises the steps:
(1) unwrapping wire: with copper core unwrapping wire to production line;
(2) moulding internal shield and middle layer insulating: to the copper core, form coating layer with the extrusion molding of double-layer coextrusion equipment with semiconductive inner shield material and silane cross-linkable polyethylene material;
(3) cooling: the product to after step (2) moulding cools off;
(4) moulding outer shielding layer: with the 3rd extruder semiconductive external shield material is coated on outermost layer and forms the 3rd layer;
(5) cooling: the product to after step (4) moulding cools off;
(6) rolling: the cooled product of step (5) is carried out rolling;
(7) typing: the product after the rolling is carried out the boiling typing.
Wherein: adopt natural cooling or air-cooled cooling in the said step (3).
Said step is carried out dustless processing in (3).
Said step (5) adopts the water-cooled cooling.
A kind of silane cross-linkable polyethylene is produced the production equipment of 10-35kV power cable, is sequentially provided with the 3rd layer of extrusion equipment and bosh of the double-layer coextrusion equipment of semiconductive inner shield material and silane cross-linkable polyethylene material, dustless closed conduct, semiconductive external shield material.
After bosh, also further be provided with take-up.
After take-up, further be provided with the boiling modular system.
After adopting such scheme; Because the present invention adopts the 2+1 technological process, on the copper core, molds internal shield and intermediate insulating layer earlier through double-layer coextrusion, after supercooling; Intermediate insulating layer is suitably solidified; The reshaping outer shielding layer after moulding, has promptly guaranteed to have certain tightness between outer shielding layer and the intermediate insulating layer so afterwards; Can guarantee to have certain rippability intensity between the two again, can produce the 10-35kV power cable that matches in excellence or beauty and on CCV stretched wire unit, produce fully in peroxide.
In addition, equipment according to the invention also has following advantages:
1, factory building length is significantly dwindled: owing to do not need the continuous vulcanization process of peroxide crosslinking production line, so whole production line is no more than 30 meters long;
2, the equipment couplet reduces with the input of factory building greatly;
3, because the length of production line only about 30 meters, so loss is few;
4, because no sulfidation need not nitrogen during production, can reduce operating cost;
5, silane cross-linkable polyethylene is cheaply more a lot of than peroxide crosslinkable polythene material, can reduce material cost.
Therefore, production line input cost according to the invention, production cost and operating cost all are significantly less than existing production technology.
Description of drawings
Fig. 1 is existing CCV peroxide crosslinking production line;
Fig. 2 is technological process of production figure of the present invention;
Fig. 3 is the structural representation of crosslinked with silicane apparatus for production line of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is made further detailed description.
Disclosed is a kind of silane cross-linkable polyethylene and produce the production technology of 10-35kV power cable, as shown in Figure 2, this production technology comprises the steps:
(1) unwrapping wire: with copper core unwrapping wire to production line;
(2) moulding internal shield and middle layer insulating: to the copper core, form coating layer with the extrusion molding of double-layer coextrusion equipment with semiconductive inner shield material and silane cross-linkable polyethylene material;
(3) cooling: the product to after step (2) moulding cools off; This step can adopt natural cooling or air-cooled cooling, and preferably carries out dustless processing, and in addition, the cooling length of this step generally can be no more than 1 meter;
(4) moulding outer shielding layer: with the 3rd extrusion equipment outer conductive shield material is coated on it with semiconductive external shield material;
(5) cooling: the product to after step (4) moulding cools off; This step can adopt traditional water-cooled cooling, and adopts 20 meters boshes in the existing crosslinked with silicane technology to cool off;
(6) rolling: the cooled product of step (5) is carried out rolling;
(7) typing: the product after the rolling is carried out the boiling typing.
The present invention has also disclosed the production equipment that a kind of silane cross-linkable polyethylene is produced the 10-35kV power cable; As shown in Figure 3; This equipment is sequentially provided with the 3rd extrusion equipment 4 and the bosh 5 of double-layer coextrusion equipment 2, dustless closed conduct 3, the semiconductive external shield material of semiconductive inner shield material and silane cross-linkable polyethylene material, also can further comprise take-up 6 and boiling modular system 7.
The course of work of this production line is: semiconductive external shield material and silane cross-linkable polyethylene material form coating layer through 2 extrusion moldings of double-layer coextrusion equipment to copper core 1; Make its natural cooling once through one section dustless closed conduct 3; Through the 3rd extrusion equipment 4 outer conductive shield material is coated on it again; Carry out pond cooling through bosh 5 afterwards, carry out rolling through take-up 6 then, get final product it being carried out the boiling typing again.
Claims (5)
1. the production technology that silane cross-linkable polyethylene is produced the 10-35kV power cable is characterized in that comprising the steps:
(1) unwrapping wire: with copper core unwrapping wire to production line;
(2) the moulding internal shield and in layer insulating: to the copper core, form coating layer with the extrusion molding of double-layer coextrusion mode with the two extruders of common die with semiconductive inner shield material and silane cross-linkable polyethylene material;
(3) cooling: the product to after step (2) moulding cools off;
(4) moulding outer shielding layer: with the 3rd extruder semiconductive external shield material is coated on outermost layer and forms the 3rd layer;
(5) cooling: the product to after step (4) moulding cools off;
(6) rolling: the cooled product of step (5) is carried out rolling;
(7) typing: the product after the rolling is carried out the boiling typing.
2. silane cross-linkable polyethylene according to claim 1 is produced the production technology of 10-35kV power cable, it is characterized in that: adopt natural cooling or air-cooled cooling in the said step (3).
3. silane cross-linkable polyethylene according to claim 1 is produced the production technology of 10-35kV power cable, and it is characterized in that: said step is carried out dustless processing in (3).
4. silane cross-linkable polyethylene according to claim 1 is produced the production technology of 10-35kV power cable, it is characterized in that: said step (5) adopts the water-cooled cooling.
5. a silane cross-linkable polyethylene is produced the production equipment of 10-35kV power cable, and it is characterized in that: this equipment is sequentially provided with the 3rd extrusion equipment, bosh, take-up and boiling modular system of the double-layer coextrusion equipment of semiconductive inner shield material and silane cross-linkable polyethylene material, dustless closed conduct, semiconductive external shield material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210028468 CN102568701B (en) | 2012-02-09 | 2012-02-09 | Production process and equipment for producing 10-35kV power cable by silane crosslinkable polyethylene |
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| CN 201210028468 CN102568701B (en) | 2012-02-09 | 2012-02-09 | Production process and equipment for producing 10-35kV power cable by silane crosslinkable polyethylene |
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| CN102568701A true CN102568701A (en) | 2012-07-11 |
| CN102568701B CN102568701B (en) | 2013-05-01 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779002A (en) * | 2015-04-29 | 2015-07-15 | 深圳市金泰科环保线缆有限公司 | Wave-absorbing shielding cable and processing technology thereof |
| CN105551645A (en) * | 2015-12-30 | 2016-05-04 | 广安金侑达电业科技有限公司 | Novel water-tree-resistant insulating water-blocking power cable and preparation method therefor |
| CN110568227A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Plug-in device for measuring partial discharge inside cable |
| CN110568322A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Method for preparing cable partial discharge defect model by adopting silicon rubber |
| WO2022048035A1 (en) * | 2020-09-04 | 2022-03-10 | 江苏易鼎复合技术有限公司 | Composite material enhanced insulated conductor and manufacturing method therefor |
| CN115440447B (en) * | 2022-09-16 | 2023-08-29 | 国网山东省电力公司电力科学研究院 | Double-layer co-extrusion film-coated wire and preparation process thereof |
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- 2012-02-09 CN CN 201210028468 patent/CN102568701B/en not_active Expired - Fee Related
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| JP2003147134A (en) * | 2001-08-27 | 2003-05-21 | Fujikura Ltd | Semiconductor watertight composition |
| CN1428792A (en) * | 2001-12-26 | 2003-07-09 | 山东鲁能泰山电缆股份有限公司 | 500KV ultra-high voltage cross-linking cable and its production process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104779002A (en) * | 2015-04-29 | 2015-07-15 | 深圳市金泰科环保线缆有限公司 | Wave-absorbing shielding cable and processing technology thereof |
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| CN105551645A (en) * | 2015-12-30 | 2016-05-04 | 广安金侑达电业科技有限公司 | Novel water-tree-resistant insulating water-blocking power cable and preparation method therefor |
| CN110568227A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Plug-in device for measuring partial discharge inside cable |
| CN110568322A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Method for preparing cable partial discharge defect model by adopting silicon rubber |
| WO2022048035A1 (en) * | 2020-09-04 | 2022-03-10 | 江苏易鼎复合技术有限公司 | Composite material enhanced insulated conductor and manufacturing method therefor |
| CN115440447B (en) * | 2022-09-16 | 2023-08-29 | 国网山东省电力公司电力科学研究院 | Double-layer co-extrusion film-coated wire and preparation process thereof |
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| CN102568701B (en) | 2013-05-01 |
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