EP0064258A1 - Low or non rotating wire rope consisting of a centre rope and an outer strand layer - Google Patents

Abstract

A wire rope, particularly a non-twistable wire rope, wherein an annulus of outer strands surrounds a wire rope center with a central strand and one or more annuli of neighboring strands surrounding the central strand. The wires of the strands in the center do not intersect each other. The entire center or at least some of its strands are densified prior to or during application of the outer strands. Alternatively, or in addition to such densification, at least some strands of the center are assembled of wires having an other than circular outline to thereby reduce the combined cross-sectional area of voids in the center.

Description

• insbesondere mit einem Kernseil aus einer Herzlitze und einer Mehrzahl von Litzenlagen, worin die Litzen der verschiedenen Litzenlagen parallel zueinander verlaufen, insbesondere im Falle einer Mehrzahl von Drahtlagen in den Litzen auch die Drähte der verschiedenen Drahtlagen parallel' zueinander verlaufen, insbesondere ferner die äußeren Drähte aufeinanderliegender Litzen verschiedener Litzenlagen sich nicht überkreuzen,
• insbesondere ein drehungsarmes oder drehungsfreies Drahtseil.

The invention relates to a wire rope made of a core rope without strand crossings and an outer strand layer stranded thereon,

• in particular with a core rope consisting of a cardiac strand and a plurality of stranded layers, in which the strands of the different stranded layers run parallel to one another, in particular in the case of a plurality of wire layers in the strands the wires of the different wire layers also run parallel to one another, in particular furthermore the outer wires lying one on top of the other Do not cross strands of different strands,
• especially a low-rotation or rotation-free wire rope.

The invention has for its object to increase the breaking strength and / or the flexibility of such a rope and / or to simplify its manufacture.

According to the invention, this purpose is achieved in that in the strand layer or the strand layers of the core rope, the strands are flattened in a manner known per se and flattened at the contact points between the strands Have cross-section.

The flattening at the contact points means a reduction in the spaces between the strands, thus an increase in the metal cross section and thus an increase in the breaking strength. The flattening at the contact points also increases the contact area and thus increases flexibility. Which breaking strength and flexibility values are achieved and to what extent they exceed those of other constructions depends on the other rope construction or on which known rope the new rope is compared with; the same applies to the manufacturing effort. In any case, an improvement is always achieved in at least one respect.

The rope core can be made from non-circular cross-section strands, e.g. from six symmetrical triangular strands or from three oval strands or oval-like strands that are approximately segment-shaped.

Preferably, however, especially because of the simpler production, the core rope is compressed on its cross section as a whole, such as by pulling, hammering, rolling, rolling.

You can also start from non-round strands, which can already be compacted, or from round, compacted strands, such as drawn or rolled.

The partial use of such strands is also possible.

The production of the core rope from strands of non-circular cross-section and / or compacted strands leads to an even higher metal cross-section. However, it means quite a lot of effort.

With this single measure, the production of the core rope from conventional, uncompressed strands and the compression of its cross-section as a whole results in an extraordinary compression, even if it compresses the strands only less.

It goes without saying that for the compression of the cross section as a whole, the core rope must be constructed as free of crossings as possible. Crossings of the strands are excluded, either the core rope has only one strand layer or the strands of the different layers run parallel to each other (parallel design). Crossovers of the wires in the strands are at least undesirable, the strands should therefore have only one wire layer or wires of different wire layers running parallel to one another (parallel lay strands). By appropriate choice of lay lengths and lay directions you can also avoid that the outer wires of different strands lying on top of each other cross. A core rope in parallel construction made of parallel lay strands and without crossovers of the outer wires of strands lying one on top of the other is therefore specified at the beginning as a construction which is particularly suitable for the invention. In the context of the invention, such a rope has the advantage over a single-layer rope that the compression of the cross section as a whole has a greater effect on it.

The application of the inventive measure also emphasized at the beginning is particularly advantageous on a low-rotation or rotation-free wire rope. Here, especially in connection with other design measures, it improves the turning behavior of the ropes.

A rope in parallel design is an independent wire rope from parallel lay strands, which as a whole have a cross-section flattened at the points of contact between the strands due to compression of the rope cross section.

It has the advantages of high metal cross section, high flexibility and comparatively simple, inexpensive production of these properties, which are also used according to the present invention.

However, it has the disadvantage that when the rope cross section is compressed as a whole, the wire sections forming the rope circumference lose their original shape of individually protruding, elongated humps, and the rope receives a fairly smooth cylindrical surface and, as a result, in the grooves of the deflection pulleys adapted to the rope surface, such as the outer wire sections on pods are so protected that the rope is not ready to be discarded in time; the inner destruction of the rope progresses too far compared to the visible wire breaks on the surface.

The present invention translates these relationships into an advantage. By turning the rope into a core rope, it places the smooth surface inside the rope, where its longer service life is desired and the smooth surface also protects the areas of the entire rope that are by far the most stressed, namely the crossovers between the outer strands of the rope Core rope and the outer strand layer of the rope stranded on it. This finding includes the invention.

The strands of the outer strand layer of the rope can be conventional, but also compacted strands. As a rule, it should be recommended for the outer strand layer in in this regard, use the same type of strands as for the core rope.

The core rope can be compressed during its manufacture or in a separate operation or when the outer strand layer is stranded.

The drawing shows an embodiment of the invention.

It shows a cross section through a rotation-free wire rope.

The wire rope shown consists of a core rope and an outer strand layer 2 stranded thereon after completion of the core rope in the opposite direction of travel.

The core rope 1 is a rope of a parallel design: a layer of inner strands 3 and a layer of outer strands 4 and 5 are simultaneously stranded in parallel on a cardiac strand 10. All strands 3 to 5 are normal strands, i.e. they have a layer of six wires of the same diameter as the core wire on a core wire. The outer strands 4 arranged between each of the two inner strands 3 above them are larger than the outer strands 5 respectively arranged on an inner strand 3.

The core rope 1 is compressed. The strands, the outer wires of which were previously undeformed rotationally symmetrically around the core wire, are flattened at their contact points 6 and the spaces 7 between the strands have been reduced. The strands have also been compressed in themselves; similar flattening and space ver Reductions, as just mentioned, can be found in the strands between the wires. The surface of the core rope 1, apart from comparatively small grooves 8 between the outer strands 4 and 5, is essentially cylindrical.

The outer strand layer 2 also consists of normal strands, but of smaller diameter. These strands are undeformed.

The number of construction of the rope is (1 + 6 + (6 + 6)) +16. It would also be possible to make it larger or smaller.

Compared to a rotation-free wire rope of the same construction made of compressed strands, the core rope of which has not been compressed as a whole, the rope has approximately the same metal cross-section and the same breaking strength, greater flexibility and cost-saving production; it can also be made from thinner strands that are difficult to compact.

Claims (5)

1. wire rope consisting of a core rope without strand crossings and an outer strand layer (2) stranded thereon, in particular with a core rope (1) consisting of a cardiac strand (10) and a plurality of strand layers (3; 4; 5), wherein the strands (3; 4; 5) the different strand layers run parallel to one another, in particular in the case of a plurality of wire layers in the strands also the wires of the different wire layers run parallel to one another, in particular furthermore the outer wires of strands lying on top of one another of different strand layers do not cross, in particular low-rotation or rotation-free wire rope,
characterized in that in the strand layer or the strand layers (3; 4; 5) of the core rope the strands (3; 4; 5) in a manner known per se have a non-circular one, at the contact points (6) between the strands (3; 4 ; 5) have a flattened cross-section. 2. wire rope according to claim 1,
characterized,
that all or part of its strands are pre-compressed. 3. A method for producing a wire rope according to claim 1 or 2,
characterized,
that the core rope is made from strands of non-circular cross-section. 4. A method for producing a wire rope according to claim 1 or 2,
characterized,
that the core rope is compressed as a whole on its cross section. 5. The method according to claim 4,
characterized,
that the core rope is compressed during its manufacture or in a separate operation or when the outer strand layer is stranded.

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