CN103137266A - Method for manufacturing power cables - Google Patents

Abstract

The invention relates to a method for manufacturing power cables. The method comprises the steps of wire drawing, softening, stranded wire pressing, cross-linking three-layer co-extrusion, copper strip three-layer wrapping, cabling, distance sleeve extrusion, sheath installation, sheath extruding and printing or installed sheath spark testing, finished product inspection and packaging. The method for manufacturing power cables has the advantages that produced power cables are ensured to be safe and reliable, and a production process is scientific and economic.

Description

The manufacture method of power cable

Technical field

The present invention relates to a kind of power cable (35kV and following copper core, aluminium core PVC insulated power cable), relate in particular to a kind of manufacture method of power cable.

Background technology

In the power cable production process, the continuous stack combinations mode of production of big-length, impact on power cable production is of overall importance and controlled, any link is out of joint, whole cable product quality had a strong impact on, mass defect occurs in internal layer, and does not in time find to stop producing, and the loss that causes so is just larger.Because the production of electric wire is different from modular product, can take refitting apart and change another part, arbitrary parts of electric wire or the quality problems of technical process, this root cable almost can't be retrieved and be made up, processing afterwards is all very passive, not that sawing short is exactly that degradation is processed, or scrap the whole piece cable, so the process of producing is particularly important.

Summary of the invention

The technical issues that need to address of the present invention have been to provide a kind of manufacture method of power cable, are intended to solve the above problems.

In order to solve the problems of the technologies described above, the present invention realizes by following steps:

1, wire drawing;

2, softening;

3, strand adpressing;

4, cross-linked three-layer co-extrusion;

5, three layers of copper strips are wrapped;

6, stranding;

7, squeeze separation sleeve;

8, armouring;

9, sheath extrudes lettering or the spark test of armouring sheath;

10, product inspection;

11, packing;

Wherein in step 1: in stress metal processing, make under external force the copper bar by force by wire drawing die on the copper bar of different size, metal cross section is long-pending compressed, and obtains desired cross-sectional area shape and size;

In step 2: will put heat hot into through the whole circle of the core of wire drawing standby, and after being heated to 630 to 660 ℃ of temperature, be placed in air Slow cooling or water cooling rapidly;

In step 3: allow single line more than 2, according to stranded the forming of direction of regulation; Add water-proofing powder or water blocking yarn in the twisted wire process;

In step 4: around the core of cable, semiconductive material+insulating material is extruded simultaneously form;

In step 5: copper strip material is wrapped on the finished product of three-layer co-extruded operation around certain orientation;

In step 6: single or single above the strand around certain orientation through the wrapped single line finished product that forms of copper strips is made into whole cable; Wherein: add around waterstop and damp proof insulation layer.

Compared with prior art, the invention has the beneficial effects as follows: the power cable safety, reliable of guaranteeing to produce material; And production technology science, economy.

Embodiment

Below in conjunction with embodiment, the present invention is described in further detail:

The present invention realizes by following steps:

1, wire drawing;

2, softening;

3, strand adpressing;

4, cross-linked three-layer co-extrusion;

5, three layers of copper strips are wrapped;

6, stranding;

7, squeeze separation sleeve;

8, armouring;

9, sheath extrudes lettering or the spark test of armouring sheath;

10, product inspection;

11, packing;

Wherein in step 1: in stress metal processing, make under external force the copper bar by force by wire drawing die on the copper bar of different size, metal cross section is long-pending compressed, and obtains desired cross-sectional area shape and size;

In step 2: will put heat hot into through the whole circle of the core of wire drawing standby, and after being heated to 630 to 660 ℃ of temperature, be placed in air Slow cooling or water cooling rapidly;

In step 3: allow single line more than 2, according to stranded the forming of direction of regulation; Add water-proofing powder or water blocking yarn in the twisted wire process;

In step 4: around the core of cable, semiconductive material+insulating material is extruded simultaneously form;

In step 5: copper strip material is wrapped on the finished product of three-layer co-extruded operation around certain orientation;

In step 6: single or single above the strand around certain orientation through the wrapped single line finished product that forms of copper strips is made into whole cable; Wherein: add around waterstop and damp proof insulation layer.

The present invention is drawing process at first, namely according to the product needed of different model, with the copper bar of different size in stress metal processing, make under external force the copper bar pass through by force mould, metal cross section is long-pending compressed, and obtain desired cross-sectional area shape and size, make its mould that changes shape, size be called as wire drawing die.

Softening: as to be standby with putting heat hot into through the whole circle of the core of wire drawing, after being heated to 630 to 660 ℃ of temperature, be placed in air Slow cooling (also or water cooling rapidly), make the wire drawing core obtain certain toughness, improve the production technology performance, avoid the phenomenon of rupture in production process, guarantee product quality.

Strand adpressing: be exactly for the pliability that improves electric wire, whole degree, so that laying installation, allow single line more than 2, according to stranded the forming of direction of regulation.From conductor wire core stranded in form, can be divided into rule stranded and irregular stranded.For the area occupied, the physical dimension of dwindling cable that reduce wire, increase effective conductive cross-sectional area, adopt in stranded conductor and press form, make the typical circular variation be semicircle, fan-shaped, watt shape and the circle of pressing.

Cross-linked three-layer co-extrusion: this technique is one of important step in the cable production link, it is the qualifying point of critical process, specifically around the core of cable, semiconductive material+insulating material is extruded simultaneously form, reduce in the operation separation process to cable inside polluting, affect its electric conductivity.

Copper strips is wrapped: as its name suggests, be wrapped in around certain orientation on the finished product of three-layer co-extruded operation with copper strip material exactly, effect has been shielding action;

Stranding: be that single or single above the strand around certain orientation through the wrapped single line finished product that forms of copper strips is made into whole cable;

Squeeze separation sleeve;

Armouring: for underground cable, during operating state, imbed underground after, can be subject to the destruction (as gnawing of mouse etc.) of shock or the terrestrial life of foreign objects.So, this type of power cable in process of production, armouring must be done, and namely through pushing through the hard protective layer (mostly being metal material) of stranding extexine parcel one deck of separation sleeve, conductor wire core is played complete protective effect.

For without the 35KV of specific (special) requirements and following cable after cabling process is completed, can directly enter sheath and extrude lettering or the spark test of armouring sheath, enter subsequently product inspection, at last packing.Wherein armouring sheath spark test process, be the qualifying point of cable production process critical process.

Claims (1)

1. the manufacture method of a power cable, realize by following steps:

1, wire drawing;

2, softening;

3, strand adpressing;

4, cross-linked three-layer co-extrusion;

5, three layers of copper strips are wrapped;

6, stranding;

7, squeeze separation sleeve;

8, armouring;

9, sheath extrudes lettering or the spark test of armouring sheath;

10, product inspection;

11, packing;

Wherein in step 1: in stress metal processing, make under external force the copper bar by force by wire drawing die on the copper bar of different size, metal cross section is long-pending compressed, and obtains desired cross-sectional area shape and size;

In step 2: will put heat hot into through the whole circle of the core of wire drawing standby, and after being heated to 630 to 660 ℃ of temperature, be placed in air Slow cooling or water cooling rapidly;

In step 3: allow single line more than 2, according to stranded the forming of direction of regulation; Add water-proofing powder or water blocking yarn in the twisted wire process;

In step 4: around the core of cable, semiconductive material+insulating material is extruded simultaneously form;

In step 5: copper strip material is wrapped on the finished product of three-layer co-extruded operation around certain orientation;

In step 6: single or single above the strand around certain orientation through the wrapped single line finished product that forms of copper strips is made into whole cable; Wherein: add around waterstop and damp proof insulation layer.