EP2514867B1 - Wire rope with a long splice connection - Google Patents

Description

The invention relates to a wire rope with a long splice connection, which wire rope has a plurality of strands, wherein a support element is provided at least between two adjacent strands in the region of the long splice connection, according to the preamble of claim 1.

By means of long splice connections, cf. eg DIN 83 318, XP 001 066 439 (Nov. 1959), pp 1-10, "Splices for wire ropes ", ends of cable sections are connected to each other, whereby in particular the production of endless rope loops from finite cable sections for transport systems, such as cable cars, is made possible This embodiment results in a frictional connection which ensures cohesion of the cable sections even under the action of high tensile forces, in particular also with wire cables which are subjected to constant bending stress during operation Litz of the rope occurring friction in terms of achievable life of great importance, especially if the wire ropes are intended for use in transport equipment and constantly in operation over roll run.

The US 2,348,234 A discloses a composite rope with wire and plastic strands, wherein round plastic cables are provided as spacers between strands and with regard to the use on boats high flexibility (and strength) of the rope is desired.

Out EP 685 592 A1 a steel wire strand rope is known in which deposits of strip-shaped plastic are provided for vibration damping between the wire seats.

In EP 377 869 A2 For example, a long splice-like connection of wire ropes with more than six strands is disclosed, wherein the insertion end is each formed of a plurality of strands to allow at most a small reduction in the circumference of the rope.

Out EP 1 321 568 A2 such as EP 1 321 413 A2 is a wire rope of the type specified above known. A similar wire rope is in the US 2006/0260287 A1 described. In the case of these wire ropes, support strands, in particular of textile material, are provided as support elements in the region of the splice connection.

These support strands have a round cross-section from the outset, and they are inserted between the strands of the wire rope, for example by means of rollers, wherein the pairwise adjacent strands are pressed apart by the corresponding profiled roll. When inserted, the support strands are then deformed, their cross-section being approximately triangular. Due to this deformation of the cross section of the per se round support strands, which are pressed in the rope or splice in the triangular shape, there is a decrease in diameter. As a result, an extension of the splice is effected in the sequence. Since the strands are inserted in the cable in the splice inward, the length of these inserted strands is predefined by the selected splice geometry; in the aforementioned extension due to the diameter reduction, the inserted strands are then too short, and gaps in the wire rope form in the region of the splice connection. These gaps eventually lead, starting from a certain size, to the result that the splice at this point is even more reduced in diameter, so that it comes locally in these places to a very high wear of the wire rope. As a result, the maintenance of such wire ropes or splices is extremely expensive.

It is an object of the invention to remedy this situation and to provide a wire with a splice, which has a high diameter constancy and radial stability, so that in the result also a low maintenance cost is achieved. Furthermore, in the present wire rope, the friction between the strands and the compressive stress at intersections of the strands (at the so-called. Splice node) can be kept as low as possible and a largely uniform Litzenabstand be ensured to reduce the wire breakage development and thereby achieve a long life ,

The wire rope of the type mentioned is according to the invention characterized in that the support element is formed by a homogeneous profile part, which has a substantially trapezoidal cross section, or has a substantially equilateral trapezoidal cross-section, in which the oblique sides of the trapezoid are each formed concave, on which the strands rest laterally.

By providing profile parts, in particular plastic profiles, as support elements in the region of the long splice connection of the wire rope, the advantage is achieved that the strands in the splice region are reliably kept at a distance from one another and thus disadvantageous frictional processes between adjacent strands are eliminated; due to the uniform spacing of the strands from one another, the outline of the cable, which is better approximated by the circular shape, also results in the splicing area, which provides an advantageous contribution to the desired smoothness of the cable; a very significant advantage lies in the considerably better transverse pressure stability of the profile-part support elements provided here as compared with the prior art, which results in the diameter of the splice connection remaining highly constant. This also leads to a low cost of maintenance of the wire rope or its splice. Characterized in that the profile part or the profile parts has or have a generally trapezoidal cross-section, an optimal support of the strands of the wire rope in the region of the splice connection is achieved without a cross-sectional adaptation of the support elements would be required after their introduction. In this case, the profile parts preferably have concave oblique sides, against which the strands lie laterally; This results in an advantageous manner, a more or less flat concerns on the concave surfaces of the profile parts.

In order to eliminate the adverse friction between all adjacent strands of the wire rope, it is expedient to choose between all, e.g. one in the long splice connection a central insert replacing Einlegelitze surrounding strands provided in pairs homogeneous profile parts as support elements.

If a profile part made of plastic, preferably polypropylene, but also e.g. made of polyamide, etc., is provided a stable support and the elimination of friction between each two adjacent strands over a long period of time.

As already indicated, the strands are advantageously arranged around a central insert seat which, in the region of the long splice connection, replaces a central insert (core strand, core) of the wire rope. The Einlegelitze can be wrapped with a plastic rope, such as polyamide, wrapped, in which case the strands and the profile parts on the outside of this plastic rope wrapping issue.

In the case of the present wire rope, the profile-part support elements in the region of the splice connection can basically be produced according to a method or with the aid of a device as in the aforementioned EP 1 321 568 A2 revealed to be inserted inwardly between the strands of the wire rope; a detailed description thereof can thus be dispensed with in view of this known technology. However, it has been shown that the present profile support elements are better after spreading, ie after moving apart of the respective adjacent strands, while the strands are spread apart from the role, are inserted lengthwise in the spaces thus formed between strands and roller ,

The invention thus also provides a method for producing a long splice connection of a wire rope, wherein adjacent strands of the wire rope are kept apart from a roll and a support element in the region of the long splice is introduced lengthwise into the spaces thus formed between the adjacent strands, characterized in that the support element is formed by a homogeneous profile part, which has a substantially trapezoidal cross section, or has a substantially equilateral trapezoidal cross section, wherein the oblique sides of the trapezoid are each concave, against which the strands lie laterally.

The invention will be explained below with reference to a preferred embodiment shown in the drawing, to which, however, it should not be limited. The drawing shows in its single figure a cross section through a multi-strand wire rope in the region of a long splice, moreover, a part of a roller for introducing a profile part support member is shown schematically in section.

In the drawing, a wire rope 1 with, for example, six strands 2 in a long splice connection area 1 'is shown in a schematic cross section. The strands 2 are each in turn also composed of several strands 3. In the long splice connection area 1 'shown in FIG. 1, instead of a central inlay or core of the wire rope 1, an insertion seat 4 of a wire rope or wire rope section to be connected is provided intended. The lay-in 4 is wrapped with a polyamide rope 5 to achieve a stable sheath.

For the introduction of support elements 6 rollers are used, of which a roller 7 is shown partially and schematically in the drawing. In the present embodiment, for example, although not illustrated in detail in the drawing, three such rollers 7 can be used simultaneously to insert three supporting elements 6 simultaneously between each two adjacent wire rope strands 2, wherein the respective adjacent wire strands 2 be pressed apart by the corresponding wedge-shaped profiled rollers 7, so that a space 8 for insertion of the respective support member 6 between the adjacent two strands 2 is created.

As mentioned, a six-strand wire rope 1 is shown in the drawing, wherein three support elements 6 are inserted in a first operation by means of the (three) rollers 7 and the three further support elements 6 are introduced in a second operation by means of the rollers 7, so that between each two adjacent wire rope strands 2 each a support member 6 is arranged. This leaves a free space 8 between each two adjacent strands 2, and the strands 2 therefore do not rub against each other, whereby the life of the wire rope 1 is increased. In addition, results from the support elements 6, a uniform distance between the strands 2, and the compressive stresses at the intersections of the strands 2 (splice node - not shown) are reduced. This also reduces the wire breakage development and thus increases the service life of the wire rope 1.

In the case of the present wire rope 1, the support elements 6 introduced in the region of the splice connection 1 'are formed by homogeneous profile parts 6'. These profile parts 6 'are preferably made of a suitable plastic material, such as polypropylene, but also polyamide or polyethylene and the like. Plastic material. These homogeneous profile parts 6 'are obtained in particular by extrusion (extrusion) and have a high cross-sectional strength and transverse pressure stability. As a result, they can easily withstand a cross-sectional deformation in the inserted state, so that a high diameter constant is achieved in the region of the splice connection 1 '. This leads to the consequence that for the maintenance of such a wire rope 1 a small effort is sufficient. The choice of the respective plastic, also in terms of strength and toughness, depends on the particular purpose or the particular application of the wire and can be made by the skilled person due to simple experiments.

The homogeneous profile parts 6 'may in themselves consist of another homogeneous material, such as metal extruded profiles, e.g. made of an aluminum alloy, however, plastic is preferred in view of the better manipulability.

The profile parts 6 ', also referred to as plastic profiles or profile troughs, have, as can be seen from the drawing figure, a generally trapezoidal cross section, the base of the trapezium resting against the polyamide cable wrapping 5 and facing the narrow side facing outward. The trapezoidal shape is essentially that of an equilateral trapezoid, wherein the two opposite oblique longitudinal sides 9, 10 are concave, so as to allow adaptation to the outer circumference of the strands 2 and thus a possible flat contact of these strands 2 on the plastic profiles 6 ' ,

Theoretically, it is also conceivable to use only individual ones of the support elements 6, e.g. each second support element 6 to be provided as "profiled tendon" 6 ', and other support elements 6 as in the prior art, namely as support cables form; it would be important, nonetheless, that a sufficient diameter constancy is obtained; On the other hand, the support cables could be used as fat storage for the wire rope.

Claims (7)

1. A wire rope (1) with a long splice connection (1'), which wire rope includes several strands (2), wherein at least between two adjacent strands (2) a support element (6) is provided in the region of the long splice connection, characterized in that the support element (6) is comprised of a homogenous profile member (6') having a substantially trapezoidal cross section, or a substantially equilateral trapezoidal cross section with the oblique sides (9, 10) of the trapezoid being each concavely formed, against which the strands (2) laterally bear.
2. A wire rope (1) according to claim 1, characterized in that the profile member (6') is made of plastic.
3. A wire rope (1) according to claim 2, characterized in that the profile member (6') is made of polypropylene.
4. A wire rope (1) according to any one of claims 1 to 3, characterized in that the strands (2) are arranged about a central insertion strand (4) that replaces a central insertion or core strand in the region of the long splice connection (1').
5. A wire rope (1) according to claim 4, characterized in that the insertion strand (4) is wrapped by a plastic rope (5) made, for instance, of polyamide, wherein the strands (2) and the profile members (6') externally bear against the plastic rope wrapping.
6. A wire rope (1) according to any one of claims 1 to 5, characterized in that homogenous profile members (6') are each arranged in pairs between all of the strands (2).
7. A method for producing a long splice connection (1') of a wire rope (1) according to any one of claims 1 to 6, wherein adjacent strands (2) of the wire rope (1) are held spread apart by a roller (7) and a support element (6) is longitudinally inserted in the thus formed free spaces between the adjacent strands (2) in the region of the long splice connection, characterized in that the support element (6) is formed by a homogenous profile member (6') having a substantially trapezoidal cross section, or a substantially equilateral trapezoidal cross section with the oblique sides (9, 10) of the trapezoid being each concavely formed, against which the strands (2) laterally bear.

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