EP2207924A2

EP2207924A2 - Cable with electrical conductor included therein

Info

Publication number: EP2207924A2
Application number: EP08840299A
Authority: EP
Inventors: Rudolf F. Kirst; Hansjörg STRUWE
Original assignee: Geo Gleistein&Sohn GmbH; Helukabel GmbH
Current assignee: Geo Gleistein&Sohn GmbH; Helukabel GmbH
Priority date: 2007-10-19
Filing date: 2008-10-20
Publication date: 2010-07-21
Anticipated expiration: 2028-10-20
Also published as: WO2009049616A2; DE102007050402B3; WO2009049616A3; US9340924B2; CN101883885A; US20110132660A1; CN101883885B; WO2009049616A8; EP2207924B1; HK1146738A1; DK2207924T3

Abstract

Braided chemical fiber cable in which at least one electrical conductor is included, characterized in that the cable together with the conductor included therein is thermally stretched.

Description

Rope with electrical conductor received therein

The invention relates to a braided plastic or synthetic fiber rope in which at least one electrical conductor is accommodated, and to a method for producing such a cable.

To a pull rope with at least one integrated electric cable, for example for data transmission or power supply, considerable requirements in terms of mechanical, chemical and electrical properties are often required, such as minimum weight, maximum breaking strength, minimum torsional susceptibility, minimal elongation, buoyancy, resistance to bending load, at least two-core electrical connection for data transmission and power supply and others.

Significant problems are that a braided cable exerts considerable compressive forces on a centrally coaxial conductor when subjected to tensile stress, and that an electrical conductor is exposed to the risk of tearing when the load-carrying cable is subjected to expansion during operation.

From the CH340430 a pull cable with an electrical cable is known in which a laid in the cable core single or multi-core power cable is surrounded by a flexible and pressure-resistant tube over the entire length and is thus protected against the pressure stresses mentioned. However, the protective tube does not provide protection against the said risk of tearing the conductor due to the rope elongation.

The object of the invention is to provide a braided synthetic fiber rope in which at least one electrical conductor is received, in which said no longer exist, so that the conductor is protected against both the effects of stretching and the compressive stress of the rope.

According to the invention this object is achieved in a braided synthetic fiber rope, in which at least one electrical conductor is received, by the measure that the rope is thermally stretched together with the recorded therein conductor. Experiments have shown that due to the special stress situation during the thermal stretching an eminent with a permanent deformation of the rope and possibly also the conductor intimate positive connection of the two elements occurs, ie the cable adapts to the outer contour of the conductor, the same time the occurring inwardly directed compressive forces is compressed, so that in a subsequent operational tensile load of the rope, the risk of deterioration of the conductor can be significantly reduced by the pressure forces acting from the outside as well as the risk of tearing the conductor or even eliminated virtually completely.

An expedient embodiment is characterized in that the conductor is braided or coiled around a core. By this measure, the head receives a stretch reserve, so that there is practically no risk of tearing.

It may be provided that a cable is accommodated in the cable, which has an insulated cylindrical core, an insulating, compressible compensation layer surrounding the core, a braided or coiled conductor arranged on the compensation layer, and an insulating jacket layer enclosing the conductor. The arrangement of a compressible leveling layer further reduces the effects of the compressive forces of the rope. The leveling layer may be compliant or elastically compressible, for example in the form of a foam layer.

It can further be provided that a further braided or wound conductor, which is enclosed by a further insulating jacket layer, is arranged on the jacket layer. The thus formed two-wire electrical structure offers advantages for data transmission and power supply.

Between the conductor and the cladding layer, a protective film made of plastic may be arranged, in particular including PTFE, and optionally in a corresponding manner, a further protective film between the further conductor and the further cladding layer. These films serve as a security, if the insulation capacity of one of the coats is affected by the stretching process. The leveling layer may be made of foamed or unfoamed plastic, such as a thermoplastic elastomer or a combination of an elastomer and a thermoplastic (two-phase system).

It can be provided that at least one jacket layer consists of an extruded plastic, in particular a thermoplastic or a thermoplastic elastomer. Appropriately, it is provided that the core has a carrier element in the form of a monofilament and an extruded core layer.

The invention provides that the cable containing the at least one conductor is stretched at a temperature between 60 ° C and 200 ° C, in particular at 90 ° C to 130 ° C.

It is expedient that the rope is subjected to a stretching force which is between 1% and 50% and in particular 20% to 30% of the tensile strength of the rope. The rope, together with the conductor or cable received therein, can be subjected to a stretching ratio of 3%, 5%, 7%, 9%, 10%, 15% or more, the stretching ratio being the elongation of the stretched rope in relation to the initial length, means.

The object of the invention is further achieved by a method for producing a plastic cord with an electrical conductor received therein, comprising the steps of: a) providing an electrical conductor, b) arranging a plastic cord around the conductor, and c) thermally stretching the conductor containing rope.

Step a) may comprise the steps of: a) providing an insulating core, a2) extruding a compressive layer surrounding the core around the core, a3) placing a braided or coiled electrical conductor on the leveling layer, a4) extruding a conductor surrounding the conductor insulating jacket layer around the conductor, in particular consisting of a thermoplastic elastomer.

Step b) may include a beaten, twisted or braided (eg, round braid, core-sheathed rope, multi-core rope) rope that may be braided and / or coated with a protective sheath, and 3, 4, 6, 8, 12, 16, 20, 24, 32 or 48 strands. It is preferably provided that the rope at a temperature between 60 ° C and 200 ° C, in particular 90 ° C to 130 ° C, is stretched. Preferably, the rope is awakened at a stretching ratio as indicated above.

In a further development of the invention it can be provided that the following steps are performed before step c): bl) arranging another braided or coiled conductor on the cladding layer, and b2) extruding a further insulating layer surrounding the further conductor around the further conductor , in particular consisting of a thermoplastic elastomer.

Between the conductor and the cladding layer, a protective film made of plastic, in particular of PTFE, can be arranged, in particular by banding or wrapping.

In a corresponding manner it can be provided that a further protective film is arranged between the further conductor and the further jacket layer. The core can be made by extruding a core layer onto a cylindrical support member.

It is preferably provided that the leveling layer of foamed or foamable plastic is extruded.

The invention preferably provides that the rope is stretched at a stretching force which is between 1% and 50% and in particular 20% to 30% of the tensile strength of the rope.

The invention preferably provides that the conductor is braided and has a braiding angle of 35 ° to 55 °, in particular 45 °.

The invention further preferably provides that the conductor has a coverage of 70% to 90%, in particular 80%.

It can be provided that the further conductor is braided and has a braid angle of 30 ° to 50 °, in particular 40 °.

The further conductor can have a coverage of 50% to 80%, in particular 65%. In a preferred development of the invention it can be provided that a spreading body with rounded outer contour is arranged within the cable at a cable execution point of the cable, which has a central leadthrough opening from which an opening opening opens to the outside, the at least one electrical conductor passing through the Durchführungsöffhung in the Aufspreizkörper in and out through the Ausführungsöffhung out of this and through the spread-rope is passed through to the outside. This measure ensures a lead out of the conductor from the rope at any point, without the risk of crushing or shearing of the conductor is when the rope is subjected to a tensile load.

It can be provided that the expansion body has an at least partially hollow, spindle-shaped cross section in a longitudinal section plane containing a longitudinal axis of the rope. It is preferably provided that the Ausfülirungsöffhung is directed obliquely axially-radially outward. In addition, a protective sleeve can be arranged in the execution opening.

Conveniently, the expansion body is secured positionally in the cable.

Further advantages and features of the invention will become apparent from the following description of exemplary embodiments, reference being made to a drawing in which

1 shows a first embodiment of a cable for receiving in a braided plastic rope,

Fig. 2 shows a cross-sectional view of a second embodiment similar to Fig. 1, and

3 and 4 show a Kabelein- or -ausführung with a rounded rigid Aufspreizkörper.

Fig. 1 shows a cross-sectional view of the structure of a cable 1 for coaxial arrangement within a merely indicated, braided plastic rope 20, which is to be stretched thermally together with the cable received therein. An insulating cylindrical core of the cable 1 comprises a support element 2 consisting of a PA monofilament having a diameter of about 0.5 mm, on which a hard core layer 4 of PP having an outer diameter of about 1.6 mm is extruded.

Around the core thus formed is extruded an insulating, compressible, compressible leveling layer 6, which in the illustrated example may have an outer diameter of about 2.2 mm +/- 0.1 mm and may consist of foamed LD-PE. Alternatively, the leveling layer may be made of a thermoplastic elastomer, such as PE, PP, PVC, or the like, combined with non-thermoplastic portions, such as butadiene components. Also, (such as with beta radiation) crosslinked plastic materials, e.g. PETE materials, used to achieve high heat resistance, as well as fluorine polymers.

Coaxially around the leveling layer and the core located therein, a (first) conductor 8 is arranged, which has an outer diameter of about 2.8 mm and may be formed as a braid. For example, 6 x may be provided 7 individual strands of tinned copper with a single cross-sectional area of 0.15 mm, 0.75 mm = ² results in an overall cross section of 42 x 0.15 mm ^2.

Preferably, the slope of the first conductor is 8 mm, which corresponds to a braid angle of 45 °. The optimal coverage is 80%.

To the first conductor 8 is concentrically surrounding this enclosing, insulating (first) sheath layer 10 having an outer diameter of about 3.6 mm, which is extruded in particular as a tube. The first cladding layer 10 may be made of a thermoplastic or of a thermoplastic elastomer.

A second (further) conductor 12 is arranged concentrically on the first cladding layer 10 and, like the first conductor 8, preferably consists of a braid, which may have an outer diameter of 4.25 mm. The second conductor 12 preferably consists of 6 × 7 individual strands of galvanized copper with a single cross section of 0.15 mm, whereby a total cross-sectional area of 42 × 0.15 mm ² = 0.75 mm ^{2 is} formed. The slope is preferably 10 mm and corresponds to a surface angle of 40 °. The optimal coverage is 65%. Both the first conductor and the second conductor may instead of a braid in the form of a swirl screen, without crossovers, be formed, which also provides in the case of an elongation of the rope the possibility that the conductor can be stretched in the longitudinal direction, while its diameter accordingly reduced.

A second (further) jacket 14 is arranged concentrically around the second conductor 12 and preferably extruded as a tube made of plastic. The outer diameter of the second shell 14 may be about 5.0 mm +/- 0.1 mm. Like the first jacket 10, the second jacket 14 preferably consists of a high-temperature plastic, for example a thermoplastic or a thermoplastic elastomer.

In the embodiment according to FIG. 2, in contrast to the structure described above, it is provided that a (first) protective film 16 is arranged concentrically around the first conductor 8 and thus between this and the first jacket layer 10. The first protective film 16 is made of a durable plastic, in particular of PTFE with a thickness of about 0.05 mm, and may be extruded or, if it consists of a non-extrudable material, wound or banded.

Furthermore, it is provided that a second (further) protective film 18 is arranged around the second conductor 12, which is thus located between the latter and the second jacket layer 14. Also, this protective film consists of a mechanically and high temperature resistant plastic, preferably made of PTFE, wherein it may have a thickness of about 0.05 mm.

The second cladding layer 14 may have a slightly larger outer diameter of, for example, 5.1 mm +/- 0.1 mm in such an embodiment.

The protective films serve as a security in the event that the insulation capacity of the first cladding layer 10 and / or the second cladding layer 14 is impaired by the subsequent thermal / mechanical stretching operation of the rope.

Coaxially around the cable 1 is braided a chemical fiber rope 20 (not to scale in the drawing in diameter), for example in the form of a 12-braid with twelve strands (or about 16, 20, 24, 32 strands), each of which, for example, three Strands turned could be. The structure and thickness of the rope depend on the expected mechanical requirements (tensile load, torsional and bending stress).

After completion of the braided plastic rope 20 with the cable 1 received therein both components, the rope together with the cable received therein, thermally stretched together. The rope is subjected at a temperature of about 90 ° C to 120 ° C a stretching force of about 30% of the tensile strength of the rope. In this process, the macromolecules of the man-made fiber material constituting the tow, for example highly modular polyethylene (eg of the brand "Dyneema"), or aramid HMPA or HMPES, are oriented more extensively in the longitudinal direction than before the breaking strength of the rope is increased again and also the elongation under tensile stress is reduced.

The rope can be stretched by 1% to 30% of its original length during this stretching process, for example by 10% of its original length.

As the tubular braided rope contracts radially during the stretching operation, a strong compressive compressive force is exerted on the cable, the effects of which on the conductor (s) being largely absorbed and compensated by the leveling layer 6. Namely, the more or less uncontrolled and uneven occurring forces are compensated by the compressibility of the compensation layer. Crossover points of the conductor braid, which have an increased thickness in the radial direction, are pressed locally into the compensation layer and thus remain unhurt. Local pressure peaks resulting from the braid structure of the conductors and strands of the rope are distributed and compensated.

Moreover, as well as the rope itself, the cable is subject to longitudinal stretching, which may be particularly critical to the metallic components of the conductors. Due to the described design of the conductors with expansion reserve (braid, spiraling, twist shield o.a.) This strain can also be compensated.

As an example, consider a reduction in diameter of the cable at a 10% elongation, based on the original unstretched length. The diameter of the core, including the leveling layer (layers 2, 4 and 6), is in the case of the above-described Examples include about 2.2 mm, resulting in a reduced diameter of about 2.10 mm assuming constant volume (approximately, neglecting local compression of the compensation layer) at 10% elongation, which corresponds to a reduction of 0.10 mm. All off-core components are also subject to a diameter reduction of about 0.1 mm. As an example, the compensation layer consists of about 35% compressible volume (bubbles) and about 65% of a solid component.

When the conductors 8, 12 are braided, as described, with a braid angle of 45 °, the coverage changes about 80.8% due to the reduction in diameter of the core while increasing the pitch of the braid to about 81%, which is negligible. Even with the second conductor 12, the braid coverage changes only by 1%.

Figures 3 to 7 illustrate an expedient solution to the problem of leading a conductor or cable extending centrally in the cable outwards through the cable networks without the risk of damage. At a Kabelausführungsstelle 22 of the rope, a rigid Aufspreizkörper 24 is arranged with a rounded outer contour within the rope. The expansion body has a central feedthrough opening 26, which extends at least from one end of the expansion body into it. In the example shown in FIG. 6, the spreading body is hollow overall. From the feedthrough opening 26, an outwardly opening execution opening 28 extends in a substantially radial direction, the cable 1 passing first through the feedthrough opening 26 into the spreading body 24 and from there through the execution opening 28 out of the spreading body and through the spread-out wire led to the outside. The expansion body ensures that the cable locally has a much larger diameter than usual, so that the individual interwoven strands and their crossover points get an increased mutual distance, which allows the passage of the cable.

Even with a tensile load of the rope, this does not change, ie the cable is not exposed to the risk of damage by squeezing oa by adjacent rope strands. Fig. 3 to 5 shows another embodiment of a Aufspreizkörpers 24, which is formed substantially spindle-shaped with a Durchfuhrungsöffhung 26 and a Ausführungsöffhung 28.

If appropriate, the cable can be protected in the region of the Ausführuiigsöffhung and the adjacent rope strands by a protective sleeve, which may be partially received in the execution opening.

Positionally, the spreading can be secured, for example, by Abbindungen 30 ("Taklings").

LIST OF REFERENCE NUMBERS

electric wire

Carrier element hard core layer

Compensation layer first conductor first cladding layer second conductor second cladding layer first protective film second protective film braided synthetic fiber rope

Cable design Point

Aufspreizkörper

Through opening

exit opening

Claims

claims

1. Braided synthetic fiber rope, in which at least one electrical conductor (8, 12) is accommodated, characterized in that the rope is thermally stretched together with the conductor (8, 12) received therein.

2. Cable according to claim 1, characterized in that the conductor (8, 12) is braided or wound around a core (2, 4) around.

3. Cable according to claim 1 or 2, characterized in that in the cable a cable (1) is accommodated, the an insulating cylindrical core (2, 4), a core (2, 4) enclosing, insulating compensation layer (6). , one on the compensating layer (6) arranged, braided or coiled conductor (8) and the conductor (8) enclosing, insulating jacket layer (10).

4. Cable according to claim 3, characterized in that on the jacket layer (10), a further braided or coiled conductor (12) is arranged, which is surrounded by a further insulating jacket layer (14).

5. Cable according to claim 4, characterized in that between the conductor (8) and the jacket layer (10) a protective film (16) is arranged made of plastic, which consists in particular of PTFE.

6. Cable according to claim 4 or 5, characterized in that between the further conductor (12) and the further cladding layer (14) a further protective film (18) is arranged made of plastic, which consists in particular of PTFE.

7. Rope according to one of claims 3 to 6, characterized in that the leveling layer of foamed or unfoamed plastic such as from a ther- thermoplastic elastomer or a combination of an elastomer and a thermoplastic.

8. Cable according to one of claims 3 to 7, characterized in that at least one outer layer of extruded plastic, in particular a thermoplastic or a thermoplastic elastomer, consists.

9. Cable according to one of claims 3 to 8, characterized in that the core has a carrier element (2) in the form of a monofilament and an extruded core layer (4).

10. Rope according to one of claims 1 to 9, characterized in that the at least one conductor (8, 12) containing rope at a temperature between 60 ° C and 200 ° C, in particular at 90 ° C to 130 ° C, stretched is.

11. A rope according to any one of claims 1 to 10, characterized in that the rope is subjected to a stretching force which is between 1% and 50% and in particular 20% to 30% of the tensile strength of the rope.

12. Rope according to one of the preceding claims, characterized in that a Aufspreizkörper (24) is arranged with a rounded outer contour within the rope at a Kabelausführungsstelle (22) having a central passage opening (26) from which an outwardly opening execution opening (26). 28), wherein the at least one electrical conductor (1) through the Durchführungsöffhung (26) in the Aufspreizkörper in and out through the execution opening (28) out of this and out through the spread rope out.

13. A rope according to claim 12, characterized in that the Aufspreizkörper (24) has an at least partially hollow, spindle-shaped cross-section in a longitudinal axis of the rope containing a longitudinal axis.

14. Cable according to one of claims 12 or 13, characterized in that the execution opening (28) is directed obliquely axially-radially outward.

15. Cable according to one of claims 12 to 14, characterized in that in the Ausfüh- opening (28) a protective sleeve is arranged.

16. A rope according to any one of claims 12 to 15, characterized in that the expansion body is secured positionally in the cable.

17. A method of manufacturing a synthetic fiber rope with a conductor received therein, comprising the steps of:

a) providing an electrical conductor (1; 8, 12),

b) placing a synthetic fiber rope (20) around the conductor,

c) thermal stretching of the cable containing the conductor.

18. The method according to claim 17, characterized in that step a) comprises the following steps:

al) providing an insulating core (2, 4),

a2) extrusion of a core (2, 4) enclosing, in particular yielding compressible leveling layer (6) around the core (2, 4) around,

a3) arranging a braided or coiled electrical conductor (8, 12) on the compensating layer (6),

a4) extruding a conductor surrounding the insulating insulating layer (10) around the conductor, in particular consisting of a thermoplastic or a thermoplastic elastomer.

19. The method according to claim 17 or 18, characterized in that the rope at a temperature between 60 ° C and 200 ° C, in particular 90 ° C to 130 ° C, is stretched. "* LO"

20. The method according to any one of claims 17 to 19, characterized in that before step c) the following steps are carried out:

bl) arranging another braided or coiled conductor (12) on the cladding layer (10), and

b2) extrusion of a further conductor (12) enclosing, insulating further cladding layer (14) around the further conductor (12) around, in particular consisting of a thermoplastic or a thermoplastic elastomer.

21. The method according to any one of claims 17 to 20, characterized in that between the conductor (8) and the cladding layer (10) a protective film (16) made of plastic, in particular of PTFE, is arranged.

22. The method according to claim 20 or 21, characterized in that between the further conductor (12) and the further cladding layer (14), a further protective film (18) made of plastic, in particular of PTFE, is arranged.

23. The method according to any one of claims 17 to 22, characterized in that the core (2, 4) by extruding a core layer (4) on a cylindrical support member (2) is produced.

24. The method according to any one of claims 18 to 23, characterized in that the leveling layer (6) is extruded from foamed or foamable plastic.

25. The method according to any one of claims 17 to 24, characterized in that the rope is stretched at a stretching force which is between 1% and 50% and in particular 20% to 30% of the tensile strength of the rope.

26. Rope or method according to one of the preceding claims, characterized in that the conductor (8) is braided and has a braiding angle of 35 ° to 55 °, in particular 45 °. - -

27. Rope or method according to one of the preceding claims, characterized in that the conductor (8) has a coverage of 70% to 90%, in particular 80%.

28 rope or method according to any one of the preceding claims, characterized in that the further conductor (12) is braided and has a braid angle of 30 ° to 50 °, in particular 40 °.

29. Rope or method according to one of the preceding claims, characterized in that the further conductor (12) has a coverage of 50% to 80%, in particular 65%.

30. Rope or method according to one of the preceding claims, characterized in that the rope is subjected to a stretching ratio of 3%, 5%, 7%, 9%, 10%, 15% or more.