RU2795270C1 - Method and device for sealing a stranded conductive core or strand - Google Patents

Abstract

FIELD: electrical engineering; cable engineering.

SUBSTANCE: device for sealing multi-wire conductive cores or strands of cable products contains a mechanism for pulling a multi-wire conductive core or strand through the sealing zone with a sealing die rotating around the axis of movement of the stranded conductive core or strand, the number of sealing zones with a sealing die in the device is more than one, the device additionally contains a mechanism for rotating sequentially arranged sealing dies, designed to provide a smoother compression of the core or strand. The mechanism for pulling the stranded conductive core or strand, located between the sealing dies, additionally contains a compensator for drawing the compacted multiwire conductive core or strand.

EFFECT: increasing the fill factor of a multi-wire conductive core or strand of the third class of flexibility or higher

4 cl, 1 dwg

Description

Technical field

The invention relates to cable technology, in particular to a technology for the manufacture of sealed multi-wire conductive cores or strands of cables and wires, mostly small.

State of the art

From the field of cable technology, methods are known for compacting multi-wire cable cores using a system of successively arranged rollers or rollers.

A known method of sealing multi-wire conductive cores, described in the book "Production of cables and wires" edited by N.I. Belorusov and I.B. Peshkova, Energoizdat, 1981. Compaction of round copper and aluminum conductors is carried out along layers of wires using three pairs of compacting rollers installed in series. The first pair of rollers performs pre-compression, giving the core an ellipse shape, the second pair of rollers brings the core to the desired size, and the third is designed to finish the surface of the core. Consolidation by layers is used to obtain high fill factors of multi-wire conductive conductors. The disadvantage of this method of sealing is the increase in the winding of wires in the strands of the core at large reductions. Also for these purposes compacting rollers with forced rotation are used. The closed shape of the rollers reduces the number of scratches, burrs, the core is densely packed on the surface, and forced rotation allows you to increase the compression force.

Also known is a method for manufacturing multi-wire compacted cores of cable products RF patent No. 2010368 "Method of manufacturing multi-wire compacted cores of cable products", MPK H01V 13/12, patent holder NPO VNIIKP, in which the wires are twisted with step h in a caliber with a cylindrical input section, obtained the workpiece is compacted by two pairs of successively arranged rollers with mutually perpendicular axes, the first pair of rollers being placed at a distance L1 from the beginning of the cylindrical section of the caliber, and the second - at a distance L2 from the first pair of rollers, characterized in that, in order to improve the mechanical and electrical characteristics of the cores , distances L1 and L2 are chosen within (0.8-0.9)h.

Methods for sealing conductive cores using sealing rollers are widely used in the cable industry and are typical for conductive stranded aluminum or copper cores of the second and third flexibility classes in accordance with the classes specified in GOST 22483-2021 "Conductive conductors for cables, wires and cords", in including for giving multi-wire current-carrying conductors a cross-sectional shape other than a circle, for example, a sector one. In the process of compacting multi-wire conductive cores with the help of wire rollers, the cores in each wind are significantly deformed, which ultimately reduces the electrical parameters of the finished core and requires additional heat treatment of the core. The second and third classes of flexible conductors are used for power cables of various voltages and purposes. For sealing flexible stranded conductors of the fourth class of flexibility and more, intended for small cables and wires, the system of rollers or sealing rollers is practically not used.

From other fields of technology, methods and devices for compressing various wire strands in the production of spiral ropes are known, the sealing of which occurs with the help of crimping dies, examples of such methods are described in the USSR inventor's certificates for inventions: No. 330223 "Method of plastic compression", IPC D07B 7/00 , applicant Odessa Polytechnic Institute; No. 642398, "Device for compressing strands", IPC D07B 7/02, applicant All-Union Research Institute of Hardware Industry; No. 1434013 "Method of plastic crimping of a twisted wire product", IPC D07B 7/02, applicant All-Union Research Institute of Hardware Industry; in the patent of the Russian Federation for the invention No. 1699181 "Method for calibrating twisted wire products and a device for its implementation", IPC D07B 7/02, patent holders JSC "Kamkabel" and "VNIIKP".

The above methods and devices are used in the production of ropes and cables made from various grades of steel, or high-strength, refractory metals and their alloys. The system of rollers does not allow to provide the required level of compression of steel cables and ropes, as is traditionally done in the cable industry in the production of stranded conductors from copper and aluminum. This technological feature is associated with the high hardness of steel and its low ductility compared to copper and aluminum, therefore, to compress steel cables and ropes, as a rule, compression methods are used using dies, which allow maximum compaction of steel cables and ropes.

The closest analogue for the claimed invention in terms of the method is the USSR author's certificate for the invention No. 737538 "Method of compressing wire strands", IPC D07B 7/02, the applicant is the All-Union Research Institute of the hardware industry. The disadvantage of this method is that the purpose of the invention is to reduce the wear and consumption of the technological tool of the drawing die when compressing the wire strands of twisted wire products, and not to improve the characteristics of the wire products themselves. To do this, the method introduces a restriction on the speed of rotation of the die from 8 to 40 revolutions per strand step, and also fixes the direction of rotation of the die against the direction of laying the strand of twisted wire products.

The closest analogue for the claimed invention in terms of the device is the USSR author's certificate for the invention No. 429155 "Device for crimping wire ropes and strands", IPC D07B 7/02, D07B 3/00, applicant Odessa Polytechnic Institute. The disadvantage of this device is that the rotating die is mounted with the possibility of free rotation and does not provide for its forced rotation at a fixed speed, which does not guarantee the same quality of compression of the finished product along its length. Also, the description of the device does not contain information about the presence of zones or nodes in it that provide lubrication of the product during its compression through a freely rotating die, the absence of which can lead to overheating of the die and the product itself, as well as to deformation or breakage of the product at the place of compression.

The technical problem to be solved by the invention is to increase the fill factor of a multi-wire conductive core or strand of the third class of flexibility and more, intended mainly for small cables and wires, by creating a uniform distribution of the seal over the cross section and along the entire length of the core or strands in the process of their manufacture .

As a result of the search through open sources of information, no decisions were found containing the entire set of essential features of independent claims, which allows us to conclude that the claimed invention complies with the criterion of patentability "novelty".

Also, in the process of checking the "inventive step" from the prior art, the technical solutions claimed in the invention were not identified, which indicates that the patentability of the claimed invention meets the criterion of "inventive step".

Disclosure of the essence of the invention

The problem is solved by the fact that in the method of sealing multi-wire conductive cores or strands of cable products, in which the multi-wire conductive core or strand is pulled through the sealing die rotating around the axis of movement of the multi-wire conductive core or strand, the multi-wire conductive core or strand twisted with step h, compacted by compression by pulling at a speed V, through at least two sequentially located rotating sealing dies, while the angular speed of rotation of the sealing dies n and the speed of pulling a multi-wire conductive core or strand V is selected from the condition:

, при заданных значениях шага скрутки многопроволочной токопроводящей жилы или стренги h позволяет обеспечить постепенное равномерное распределение уплотнения жилы или стренг по сечению и по всей длине в процессе их обжатия на каждой вращающейся уплотняющей волоке и тем самым повысить коэффициент заполнения многопроволочной токопроводящей жилы или стренги.The presence of two or more successively located rotating sealing dies, taking into account the choice of values of the angular velocity of rotation of the sealing dies n and the speed of pulling a multi-wire conductive core or strand V for each rotating sealing die from the condition

, at given values of the twisting pitch of the stranded conductive core or strand h makes it possible to ensure a gradual uniform distribution of the compaction of the core or strands over the cross section and along the entire length in the process of their compression on each rotating sealing die and thereby increase the fill factor of the stranded conductive core or strand.

In addition, the compaction of a multi-wire conductive core or strand by compression by drawing through at least two successively located sealing dies is carried out in an aqueous emulsion medium, which provides lubrication between the core or strand and the sealing dies, which eliminates excessive heating in the sealing zone and reduces breakage. wires in a multi-wire conductive core or strand during compression.

The problem is solved by the method described above using the claimed device for sealing multi-wire conductive cores or strands of cable products, containing a mechanism for pulling a multi-wire conductive core or strand through the sealing zone with a sealing die rotating around the axis of movement of the multi-wire conductive core or strand, in which the number of sealing zones with more than one sealing die in the device, the device additionally contains a mechanism for rotating sequentially arranged sealing dies, designed to provide smoother compression of the core or strand. The mechanism for pulling a multi-wire conductive core or strand, located between the sealing dies, additionally contains a compensator for drawing a compacted multi-wire conductive core or strand, since in the process of crimping the core or strand on each die, a slight deformation of the wires along the length of the core or strand is permissible, which requires a compensator for drawing a compacted multi-wire conductive core or strand between sealing dies.

In addition, the device additionally contains nodes for supplying a flowing emulsion to the sealing zones of a multiwire conductive core or strand to provide lubrication to the die, core and strand, as well as to reduce the temperature in the sealing zone of the core or strand.

Brief description of the drawings

For a better understanding of the claimed invention in terms of the device in FIG. 1 schematically shows a device for sealing multi-wire conductive cores or strands of cable products, containing a mechanism for pulling a core or strand 1 through the sealing zone of the core or strand 2, located between two sealing zones of the core or strand 2, in which sealing dies 3 are placed, rotating around the axis of motion cores or strands, a mechanism for rotating sequentially arranged sealing dies 4, a compensator for drawing a compacted multi-wire conductive core or strand 5, located in the mechanism for pulling a multi-wire conductive core or strand 1.

In addition, the device may additionally contain units for supplying the flowing emulsion 6 to the compaction zones of the core or strand 2.

Implementation of the invention

Separate components and parts used for the manufacture of the device claimed as an invention for sealing a multi-wire conductive core or strand, as described above, are widely used in the manufacture of various technological equipment intended for the production of cores and for wire drawing.

A device for sealing a multi-wire conductive core or strand, as described above, is made as follows.

The mechanism for pulling the core or strand 1 can be made in the form of wire drawing mechanisms used on drawing mills.

The zone of sealing of the core or strand 2 with sealing dies 3 can also be made by analogy with the drawing zone located in drawing mills, in which dies for wire drawing are placed.

The mechanism of rotation of successive sealing dies 4 can be performed, for example, using a gearbox and a drive motor, and the mechanism of rotation of the dies can be made individually for each sealing die, in which case the value of the angular velocity of rotation of the sealing dies n in each sealing zone can be selected individually for calculation of operating modes of drive motors. Also, one drive motor can be used to rotate all sealing dies at once through a single shaft, in this case, the value of the angular velocity of rotation of the sealing dies n in each sealing zone can be selected by replacing a pair of gear wheels in the gearboxes through which the sealing dies rotate.

Compensator drawing compacted stranded conductive core or strand 5 are traditionally used in the production of conductive cores.

Flowing emulsion units 6 are also traditionally used in drawing mills to provide lubrication to the wire drawing area.

The claimed technical solution meets the criterion of patentability "industrial applicability", since its implementation can be carried out using known means of production, materials and technologies.

Claims (5)

1. A method for sealing multi-wire conductive cores or strands of cable products, in which the multi-wire conductive core or strand is pulled through a sealing die rotating around the axis of movement of the multi-wire conductive core or strand, characterized in that the multi-wire conductive core or strand, twisted with step h, is compacted compression by pulling at a speed V, through at least two sequentially located sealing dies, while the angular speed of rotation of the sealing dies n and the speed of pulling a multi-wire conductive core or strand V is selected from the condition:

2. The method according to claim 1, characterized in that the compaction of the multiwire conductive core or strand by compression by drawing through at least two successively located sealing dies is carried out in an aqueous emulsion medium. 3. A device for sealing multi-wire conductive cores or strands of cable products, containing a mechanism for pulling a multi-wire conductive core or strand through the sealing zone with a sealing die rotating around the axis of movement of the stranded conductive core or strand, characterized in that the number of sealing zones with a sealing die in the device more than one, the device additionally comprises a mechanism for rotating consecutive sealing dies, and a mechanism for pulling a multi-wire conductive core or strand located between the sealing dies, additionally contains a compensator for drawing a compacted multi-wire conductive core or strand. 4. The device according to p. 3, characterized in that it additionally contains units for supplying a flowing emulsion to the sealing zones of a multi-wire conductive core or strand.

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