CN103151117A

CN103151117A - Manufacturing method of separation block with high-precision diameter for separating conductor

Info

Publication number: CN103151117A
Application number: CN2013100796971A
Authority: CN
Inventors: 汤浩; 徐文皓
Original assignee: Chongqing Taishan Cable Co Ltd
Current assignee: Chongqing Taishan Cable Co Ltd
Priority date: 2013-03-13
Filing date: 2013-03-13
Publication date: 2013-06-12

Abstract

The invention relates to a manufacturing method of a separation block for separating a conductor of a power cable with large cross section. The method comprises the following steps of (1) compacting and forming procedure, adopting a compacting die, enabling the hole type of the compacting die to be uniform with the type and size of the separation block, firstly, enabling a single copper line and an inner conductor of the separation block to penetrate through the compacting die, and compacting and forming an outer conductor of the separation block by the compacting die; and (2) pretwisting procedure, enabling the compacted and formed separation block to penetrate through press wheels by the compacting die, enabling the hole types of the closed press wheels to be uniform with the hole type of the compacting die, and providing axial torsion for the press wheels when the separation block penetrates through the press wheels, so as to pretwist the separation block. The method has the advantages that the press wheels are replaced by the compacting die to compact and form, and meanwhile, a pretwisting pitch is provided for the press wheels same in shape and size; and the condition of abnormal shape of the separation block due to the nonuniform stress of the sector surface of the compacting die caused by only using the compacting die for completing compacting, forming and pretwisting can be avoided.

Description

A kind of block manufacture method of milliken conductor of high accuracy diameter

Technical field

The invention belongs to the conductor manufacturing technology of power cable.

Background technology

Milliken conductor is widely used in the heavy in section power cable, and block is the unit that forms milliken conductor.Now, all adopt the pinch roller die mould in block production, size is by adjusting the clearance control of pinch roller, but because pinch roller itself and fit clearance between bearing, pinch roller frame can change when stressed, the difficult adjusting in the gap of pinch roller.Usually have the factor of two aspects can cause conductor size unstable: the one, transfer what a fixing pinch roller gap before producing, but after a period of time die mould, the pinch roller gap easily changes, and causes conductor die mould size to change.The 2nd, conductor single line size and soft or hard degree can change on whole conductor and the lateral force during pretwist, and the reaction force to pinch roller when causing die mould changes, and make pinch roller gap minor variations, and conductor die mould size is changed.

Referring to 5 milliken conductors of Fig. 1, block 1 change in size has directly caused the external diameter fluctuation of 5 rear conductors of block plying, all can produce adverse influence to cable quality and material consumption.

Summary of the invention

The present invention is directed to the deficiency that prior art exists, purpose is to provide the block manufacture method of a kind of heavy in section power cable with milliken conductor, adopt special production technology and production equipment, avoid the size fluctuation of milliken conductor, the plying conductor diameter is controlled in very little deviate scope.

Technical scheme of the present invention is as follows:

A kind of heavy in section power cable comprises die mould and two step of pretwist operation with the block manufacture method of milliken conductor, described method;

(1) pressure-type process: adopt and to press mould, the pass that presses mould with the shape and size of block consistent, first the inner conductor of copper single line and block is passed and presses mould, press moulding by pressing the outer contact of mould to block;

(2) pretwist operation: the block that presses after the mould die mould passes pinch roller, and the pass that pinch roller closes after wheel is in full accord with the pass that presses mould, provides axial torsion by pinch roller when crossing pinch roller, allows block realize pretwist.

The present invention adopts presses the alternative pinch roller die mould of mould die mould, uses simultaneously the pinch roller with the shape size that the pretwist pitch is provided.The mould die mould is pressed in employing, and the size of block is fixed, and can with pinch roller die mould adjusting play, deviation not arranged at every turn because of operating personnel, or the reaction force of pinch roller is changed the variation that makes pinch roller gap minor variations cause the die mould conductor size during conductor die mould.Press mould and only can cause conductor size to change (generally produce the wearing and tearing that can measure are just arranged more than 50 kilometers) because of wearing and tearing after producing big-length, this can solve by the mould that presses of changing same size.Change die cost low (the general replacement expense is in 500 yuan), and mold exchange is simple to operate.Use simultaneously the pinch roller with the shape size that the pretwist pitch is provided after the compressing mold die mould, can avoid only using and press that mould is completed die mould, pretwist can be because of unbalance stress on the compressing mold sector, abnormal situation appears in the block shape.

Description of drawings

Fig. 1 is 5 conductor schematic diagrames after the block plying

Fig. 2 adopts to press mould molding and pinch roller pretwist production process schematic diagram;

Fig. 3 is the schematic diagram that presses mould;

Fig. 4 is the schematic diagram after pinch roller closes wheel;

Fig. 5 is compressing mold and pinch roller example pass dimensional drawing.

Embodiment

Further illustrate the present invention below in conjunction with accompanying drawing:

Referring to Fig. 2,The manufacture method of milliken conductor comprises die mould and pretwist two step of front and back operations:

(1) pressure-type process: adopt and press mould 1, the shape and size consistent (referring to Fig. 3) of pressing pass 21 with the spacing block 1 of milliken conductor of mould, first copper single line 4 and inner conductor 5 are passed and press mould 1, press moulding by pressing the outer contact of mould to block.

(2) pretwist operation: the conductor 6 that presses after the mould die mould passes pinch roller 3, and pinch roller closes the pass 31 and the pass 21 (referring to Fig. 4) in full accord that presses mould after wheel, provides axial torsion by pinch roller when crossing pinch roller, allows block realize pretwist.

With 1000mm ²The block of milliken conductor is example, and it is in full accord that block outermost layer die mould presses the pass that mould and pinch roller close after wheel, and Fig. 3, Fig. 4 and Fig. 5 are pass figure and the dimensional drawing of compressing mold and pinch roller.After the skin of block pressed moulding, size had cured, and follow-up pinch roller only provides axial torsion, allowed block realize pretwist.The milliken conductor shape and size of therefore producing are pressed die draft by die mould and are determined, and highly stable.Produce checking through practice, adopt former pinch roller to produce 50 kilometers of milliken conductors, the dimensional discrepancy value of the height and width of block is about ± 0.5mm, milliken conductor dimensional discrepancy value after plying is about ± 1.2mm, press the mould die mould and adopt, pinch roller is realized the dimensional discrepancy value of height and width of the block that the pretwist pitch is produced less than ± 0.1mm, and the milliken conductor dimensional discrepancy value after plying is less than ± 0.2mm.

Claims

1. the block manufacture method of a heavy in section power cable use milliken conductor, is characterized in that, described method comprises die mould and two step of pretwist operation;

(1) pressure-type process: adopt and to press mould, the pass that presses mould is consistent with the shape and size of block, first copper single line and inner conductor is passed and presses mould, presses moulding by pressing the outer contact of mould to block;

(2) pretwist operation: the conductor that presses after the mould die mould passes pinch roller, and the pass that pinch roller closes after wheel is in full accord with the pass that presses mould, provides axial torsion by pinch roller when crossing pinch roller, allows block realize pretwist.