RU2700262C1 - Method of producing a low-frequency cable with string-insulation in a polyethylene sheath - Google Patents

Abstract

FIELD: cable technology.

SUBSTANCE: invention relates to cable technology, in particular to a method for production of a low-frequency cable with cord string-insulation in a polyethylene sheath intended for use in communication lines. Method involves drawing copper wire, applying string-insulation, twisting star fours from insulated cores with winding of each four color-coded distinctive thread, wherein in quadruple two strands located along diagonal form working pair, four-strands are twisted into core by concentric layers with overlapping insulation from paper tapes, method involves drying the cable, performing a combined process of applying waist insulation from polyethylene terephthalate tape, a screen from aluminum polyethylene tape with longitudinally laid under it copper tinned wire and shells from light-stabilized polyethylene, simultaneously on the shell marking is applied.

EFFECT: simplified process of cable production due to reduced number of operations.

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Description

The invention relates to cable technology, in particular, to a method for the production of a low-frequency cable with paper-cord insulation in a polyethylene sheath intended for use in communication lines.

An analogue of the technical solution proposed for patenting is a high-frequency communication cable, which incorporates a conductive core consisting of copper single-wire insulated conductors twisted into fours, which, in turn, are twisted together. On top of the core, belt insulation and a sheath of polyethylene are made, where the insulation of conductive conductors is made of three layers - the outer and inner layers of solid polyethylene, the middle layer of porous polyethylene (patent for utility model of the Russian Federation No. 166980, publication date: 07/05/2016. )

The main disadvantages of the analogue are the large working capacitance for this type of cable: 60.0 nF (TU 3574-001-848331502-2009) (36.0 nF GOST 5008-73 is allowed), also the cable diameter is more than the requirements of GOST 5008-73 for this type cable. The causes of these shortcomings are that the used method of insulation of conductive conductors is made of three layers: the outer and inner layers of solid polyethylene, the middle layer of porous polyethylene. To reduce the working capacity, the insulation thickness of the cores was increased, which led to an increase in the cable diameter and an increase in material consumption.

The prototype of the claimed utility model is a high-frequency communication cable with cord-polystyrene insulation, which contains copper conductive cores insulated with polystyrene filament (cordelet) superimposed by an open spiral and polystyrene tape superimposed overlapping to the side opposite to the direction of the filament, twisted into star fours around a filler core made of polymeric material, wrapped with fastening threads, which, in turn, are twisted into a core. The core is sequentially applied with belt insulation from cable paper, a welded aluminum shell and a protective polymer shell (patent for a utility model of the Russian Federation No. 181872, publication date: July 26, 2018).

A significant and objective disadvantage of the prototype is the complex and energy-intensive production of cable. The cause of the occurrence is the imposition of a welded aluminum shell.

The technical result proposed for patenting the invention is to simplify the process of cable production by reducing the number of operations.

The technical result of the claimed method for the production of a low-frequency cable with paper-cord insulation in a polyethylene sheath intended for use in communication lines is characterized by the drawing of copper wire, the application of paper-cord insulation, twisting the star quartet of insulated cores with a winding of each four color distinctive with a thread, while in the four, two veins located diagonally form a working pair, twist the fours into the core to using centric coils with the application of belt insulation from paper tapes, the cable is dried, the combined process of applying belt insulation from a polyethylene terephthalate tape, a screen from an aluminum-polyethylene tape with a tinned copper wire longitudinally laid under it, and a sheath of light-stabilized polyethylene are simultaneously marked on the sheath.

Furthermore, the diameter of the copper wire is 0.9 mm.

Furthermore, the diameter of the copper wire is 1.2 mm.

In this case, marking is carried out after 1000 m.

A method of manufacturing a low-frequency cable with paper-cord insulation in a polyethylene sheath is that they first draw a copper wire with a diameter of 0.9 or 1.2 mm. Next carry out the imposition of paper-cord insulation. They twist the star four from isolated veins with a winding of each four with a colored distinctive thread. In the four, two veins located diagonally form a working pair. The veins of one pair of four must have colors: red and yellow (or natural), the other pair - blue and green. Fours are twisted into the core with concentric layers of wool with overlapping belt insulation of paper tapes. Dry the cable. A combined process of applying belt insulation from a polyethylene terephthalate tape, a screen from an aluminum-polyethylene tape with a tinned copper wire longitudinally laid under it and a sheath of light-stabilized polyethylene is carried out simultaneously, a marking is applied to the sheath, after 1000 m, containing: cable mark, name or manufacturer's code , year of manufacture, country of manufacture, measuring marks.

The tests carried out confirm the achievement of the specified technical result, which consists in simplifying the cable production process by reducing the number of operations.

Analysis of the totality of all the essential features of the proposed invention proves that the exclusion of at least one of them leads to the inability to fully ensure the achieved technical result.

The analysis of the prior art shows that there is no known method that has features identical to all the essential features of this technical solution, which indicates its unknownness and, therefore, novelty.

The above also proves the conformity of the claimed method to the criterion of inventive step.

When implementing the invention, the presence of the proposed object is really realized, which indicates industrial applicability.

Claims (4)

1. A method of manufacturing a low-frequency cable with paper-cord insulation in a polyethylene sheath, characterized in that they draw copper wire, apply paper-cord insulation, twist the star quartet of insulated conductors with each four winding with colored distinctive thread, with four veins in two located diagonally, form a working pair, twist the fours into the core with concentric midi with overlapping belt insulation of paper tapes, carry out drying ator, the process is carried out combined waist overlay isolation of the polyethylene terephthalate ribbon of alyumopolietilenovoy screen belt with longitudinally laid underneath tinned copper wire and the shell of light-stabilized polyethylene sheath simultaneously applied marking. 2. A method of manufacturing a symmetric high-frequency communication cable with cord-film insulation in a polyethylene sheath according to claim 1, characterized in that the diameter of the copper wire is 0.9 mm 3. A method of manufacturing a symmetrical high-frequency communication cable with cord-film insulation in a polyethylene sheath according to claim 1, characterized in that the diameter of the copper wire is 1.2 mm. 4. A method of manufacturing a symmetric high-frequency communication cable with cord-film insulation in a polyethylene sheath according to claim 1, characterized in that the marking is carried out after 1000 m.