RU2397563C1 - Field communication cable - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: in field communication cable of repeated use there are electric conductors, insulation protection cover and load-carrying element located under the above cover and made from synthetic high-strength strands. On each side of actual cable length there installed are connecting half-couplings in the housing of each of which there arranged is terminal block to which electric conductors of cable are soldered, sealing elements, as well as attachment point of load-carrying cable element. At that, in half-coupling housing there is protrusion, and attachment point of load-carrying element is "П"-shaped with the middle part of cylindrical shape. Load-carrying cable element is divided into two bunches, opposite and not covering each other and wound on cylindrical part of attachment point and attached to each other after not less than one coil of winding, for example by means of the point, and edges of side parts (racks) of attachment point of load-carrying element interact with protrusion on the half-coupling housing. In order to increase the breaking strength of cable in case its structure includes four or more bunches of synthetic high-strength strands, on cylindrical part of the attachment point there are at least two connection points of bunches of strands.

EFFECT: increasing breaking strength of field cable with load-carrying element made from high-strength fibres.

2 cl, 3 dwg

Description

The proposed field cable relates to cable technology, in particular to electrical communication cables for multiple applications.

Known electrical communication cables for multiple use with twisted conductive conductors (US patent No. 3772454, IPC Н01В 7/00 (174 / 113R); US patent No. 3684821, IPC НВВ 7/00 (174 / 102SC); US patent No. 4039743, IPC Н01В 11/02 (174 / 114R); US patent No. 436422, IPC H01R 4/24; England patent No. 1311552, IPC H01B 7/04 (H01A); England patent No. 1164256, IPC H01B 7/00 (H01A); England patent No. 1138653, IPC Н01В 7/00 (Н01А)). However, these cables are unsuitable for field operation, have unsatisfactory weight and size characteristics and do not provide the required breaking strength at the place of cable termination in the connecting fittings.

The closest set of essential features to the proposed cable is the cable P-296M (technical specifications TU 16-505.293-81, "Long-distance communication cable field P-296M and components"), selected as a prototype. The construction length of this cable has conductive conductors, an insulating protective sheath and a load-bearing element (braid of 38 steel wires) located under the sheath, which is fixed in the coupling half by soldering to the sleeve. At the same time, the building length is equipped on each side with connecting half-couplings, in each of which a contact block is placed, to which conductive cable conductors, tail and end sealing elements are soldered, placed on the cable entry side into the half-coupling and on the outside of the contact block, respectively.

The disadvantage of this design is that it does not allow to fix the load-bearing element, made not of steel, but of high-strength fibers (for example, of SVMK threads). In addition, when tensile forces are applied to the cable at an angle to the cable axis (tensile force with bending), the bundles of threads located along the outer bend radius take on a greater load than the bundles of threads located along the inner radius. Such mechanical impact on the field cable is typical and, as a result, leads to a decrease in the overall tensile strength of the cable.

The task is to increase the tensile strength of the field cable with a load-bearing element made of high strength fibers.

The technical result is achieved due to the following. Reusable field communication cable contains conductive cores, an insulating protective sheath and a load-bearing element located under the sheath and made of synthetic high-strength threads. On each side of the cable construction length, coupling half-couplings are installed, in the case of each of which a contact block is placed, to which conductive cable conductors, sealing elements, as well as a fastener for the load-bearing cable element are soldered. At the same time, there is a protrusion in the half-coupling case, and the attachment point of the load-bearing element has a U-shape with a middle part of a cylindrical shape. The load-carrying element of the cable is divided into two bundles, meeting and not overlapping each other, wound on the cylindrical part of the fastener and fastened to each other after at least one winding, for example, using a node, and the ends of the side parts (racks) of the fastener of the load-bearing element interact with protrusion on the half coupling body.

A comparative analysis of the claimed device with the prototype shows that the proposed cable has a number of common structural elements with the prototype, but differs by the presence of additional elements. Thus, the claimed device is characterized by the presence of additional elements and, therefore, the claimed device meets the criteria of the invention of "novelty."

Comparison of the claimed device with other similar technical solutions, including with the prototype, shows that the introduction of additional elements in the design of the coupling half, their relative position and shape can achieve the desired technical result - increase the tensile strength of the field cable with a load-bearing element made of high-strength fibers . This allows us to conclude that the distinguishing features of the claimed cable are significant in comparison with the known analogues and prototype, i.e. the proposed technical solution has an inventive step.

Analysis of the design of the proposed cable shows that this technical solution is industrially applicable, since it ensures the achievement of a specific technical result and can be reproduced at modern enterprises of the cable industry.

The essence of the invention can be understood from figure 1, which shows in section the proposed cable with a load-bearing element of high strength fibers and reinforced with a coupling half with the proposed attachment point of the load-bearing element. Figure 2 shows the attachment of the load-bearing element with two bundles of synthetic high-strength fibers wound on it, and Fig. 3 is a variant of the mount of the load-bearing element with four bundles of synthetic high-strength fibers wound on it.

Figure 1-3 indicated:

1 - coupling half housing;

2 - contact block;

3 - sealing element;

4 - cable conductors;

5 - unarmoured cable;

6 - the first bunch of high-strength threads;

7 - the second bunch of high-strength threads;

8 - a cylindrical part of the attachment point of the load-bearing element;

9 - mounting unit of the load-bearing element;

10 - a node of two beams;

11 - side parts (racks) of the mounting unit of the load-bearing element;

12 - the protrusion on the housing of the coupling half.

The structural relationship of the elements of the proposed field cable is as follows. A contact block 2, as well as tail and end sealing elements 3, are located in the housing 1 of the coupling half. Conducting cores 4 (not shown incompletely shown in Figure 1) of unarmoured cable 5 are soldered to the contacts of the block 2. The load-carrying element of cable 5 is divided into two bundles - the first 6 and the second 7, which are counter-wound on the cylindrical part 8 of the fastener 9 of the load-bearing element. After at least one full turn around the cylindrical part 8, the beams 6 and 7 are connected to each other in the node 10. The lateral parts 11 of the mount 9 are placed on the protrusion 12, available on the housing 1.

The device operates as follows. When longitudinal tensile forces are applied to the reinforced cable 5 (the cable is pulled out of the coupling half), the load, through bundles of threads 6 and 7, is transferred to the attachment point 9 of the load-bearing element, as well as to the junction 10 (for example, a “straight” assembly) of the bundles 6 and 7 , proportionately distributed between these structural elements. While the rack 11 of the mount 9 rests on the protrusion 12 on the housing 1, which limits the axial movement of the mount 9. The circular (rotational) movement of the mount 9 is eliminated by the counter winding of the beams 6 and 7 on the cylindrical part 8 of the mount 9. the fact that the beams 6 and 7 are wound on the cylindrical part 8 without overlapping, their crushing is excluded, that is, the strength characteristics of these beams do not decrease. The junction of 10 beams 6 and 7 is, from the point of view of strength characteristics, the most “weak” place of this design, because the filaments of beams 6 and 7 undergo the greatest bend in this place. However, due to the fact that a significant part of the load is redistributed from the junction of 10 beams to the latch 9, a significant increase in the tensile strength of the product as a whole is achieved in comparison with known products of a similar purpose.

Separately, it is necessary to consider the operation of the proposed device when the cable 5 is subjected to longitudinal tensile forces at an angle to the axis of the cable (tensile force with bending). In this case, the bundles of threads located along the outer radius of bending take up a greater load than the bundles of threads located along the inner radius, which in known structures of similar purpose leads to a sharp decrease in the tensile strength of the cable. In the proposed technical solution, a bundle of threads, to which a greater force is applied, for example 6, draws a bundle of threads 7 onto itself, and the knot of their connection 10 is slightly shifted (rotates) along the cylindrical surface 8 of the mount 9. Thus, the load is redistributed to the bundles 6 and 7 to complete alignment.

If there are four or more bundles of synthetic high-strength filaments in the field cable design (shown in Fig. 3), it is advisable to make not one, but at least two connection points of 10 bundles of filaments 6 and 7 on the cylindrical part 8 of the fastener 9, fastening them in the same way described above. This will allow a better redistribution of the load when the cable 5 is subjected to longitudinal tensile forces at an angle to the axis of the cable (tensile force with bending).

When manufacturing a field cable with the proposed type of coupling halves, it must be taken into account that the attachment point of the load-bearing element must have strength characteristics no worse than the load-bearing element of the cable, and the cylindrical part of the attachment point must have a fairly clean treatment (preventing breakage of elementary threads during friction and free sliding of bundles of threads). The remaining structural elements of the reinforced field cable have no features.

The technical and economic effect of the implementation of the invention consists in the fact that it allows to provide tensile strength of cables with a load-bearing element made of synthetic high-strength fibers at the place of their termination in the coupling half by 20 ... 35% more (confirmed by test results) in comparison with the known technical solutions. As a result, taking into account the statistics of the load distribution of the cable during its operation in the field, the service life of this cable can increase by 1.15 ... 1.20 times. Given the mass production of mobile cables, including those with a load-bearing element made of high-strength synthetic fibers, this will allow to obtain a significant economic effect.

Claims (2)

1. Field communication cable of multiple use, having conductive conductors, an insulating protective sheath and a load-bearing element located under the sheath and made of synthetic high-strength threads, on each side of which there are connecting half-couplings, each of which has a terminal block, which solder the conductive cable conductors, sealing elements, as well as the attachment point of the load-bearing cable element, characterized in that the housing of the coupling half has a protrusion, and the mounting unit of the load-bearing element has a U-shape with a middle part of a cylindrical shape, while the load-carrying element of the cable is divided into two bundles, counter-wound and not overlapping each other, wound on the cylindrical part of the mount and fastened to each other after at least one winding, for example using the site, and the ends of the side parts of the mounting unit of the load-bearing element interact with a protrusion on the housing of the coupling half. 2. Field communication cable reusable according to claim 1, characterized in that on the cylindrical part of the mount is placed at least two junction of bundles of threads.

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