Wire rope

Abstract

Wire rope (10) comprising a core strand (20), a plurality of strands (30) stranded around the core strand (20) forming a strand layer, and a plurality of wires (40) arranged spirally around the strand layer forming a cover layer.

Description

[0001] wire rope

[0002] The present invention relates to a wire rope.

[0003] Wire ropes are well known from prior use and can be subdivided into flat ropes, braided ropes, and cable-laid ropes, as well as shaped strand ropes, round strand ropes, and spiral ropes. Round strand ropes are known, for example, from DE 695 148 A, DD 69 281 Al, and DE 3 240 898 Al and consist of several strands arranged spirally around a common center. Spiral ropes, as known, for example, from CH 688 591 A, have several wires arranged spirally around a common center. These two rope types have very different mechanical properties with regard to fatigue strength and abrasion resistance, so the different rope types are used for very different applications: Strand ropes are particularly suitable for applications where high flexibility, orhigh flexural fatigue strength, but not high abrasion resistance, is required - spiral ropes, on the other hand, have high abrasion resistance, but not particularly high flexural fatigue strength due to their higher stiffness.

[0004] Nevertheless, there are known applications where a wire rope is subjected to both high bending stress and constant abrasion, for example, in the extraction and processing of natural stone. In these applications, the saw ropes are fitted with ferrules, also called beads or pearls, coated with a high-performance cutting material (e.g., diamond). These beads can move back and forth along the wire rope, thus gradually wearing it down. Since the lifespan of the beads is generally longer than that of the wire rope, the wire rope must sometimes be replaced several times once a minimum diameter, determined through experience, is reached, in order to utilize the full lifespan of the beads.

[0005] The object of the invention is therefore to provide a wire rope, in particular a wire rope for use as a saw rope specifically for the extraction and processing of natural stone, that exhibits both high flexural fatigue strength and high abrasion resistance. This object is achieved according to the invention by the wire rope with the features of claim 1 and the saw rope with the features of claim 13. The dependent claims describe advantageous embodiments of the invention.

[0006] The object of the invention, namely to create a wire rope that exhibits both high flexural fatigue strength and high abrasion resistance and can be used in particular as a saw rope, is achieved in particular by first producing a stranded rope which is then spirally wrapped with an outer layer of wires. The inner stranded rope provides the necessary flexibility, while the outer layer of wires exhibits high abrasion resistance. Essentially, the advantages of the flexibility of a stranded rope and the abrasion resistance of a spiral rope are combined so that the wire rope can be used for as long as possible, even under high bending loads and high abrasive stress.

[0007] In particular, the abrasion of the outer wires caused by the beads of a saw wire is reduced according to the invention without significantly affecting the flexural fatigue strength. An optimum between abrasion resistance and flexural fatigue strength can thus be achieved, and the maximum service life of a wire rope can be extended.

[0008] According to the invention, a wire rope is disclosed comprising a core strand, a plurality of strands formed around the core strand and a plurality of wires arranged spirally around the strand layer forming a cover layer.

[0009] The wires forming the outer layer have an identical center circle, so that the wires are laid parallel to each other in a spiral pattern around the central axis of the wire rope. Thus, due to the spiral arrangement of the outer layer, an overall abrasion-resistant wire rope is created.

[0010] Furthermore, the wires forming the cover layer are preferably load-bearing and thus, together with the strand, constitute an important structural element of the wire rope according to the invention. This is particularly evident in the fact that it is preferably provided that the metallic cross-section of the cover layer, i.e., the sum of the cross-sections of the wires forming the cover layer, is at least 35% of the metallic cross-section of the entire wire rope, i.e., 35% of the sum of the cross-sections of all individual wires from which the wire rope is composed. It is also highly preferably provided that the diameter of each wire forming the cover layer is at least 10% of the diameter of the entire wire rope.

[0011] The core strands and / or the strands wrapped around the core strands are preferably formed from a plurality of round wires, wherein the wires forming the cover layer are also preferably round wires.

[0012] According to a further preferred embodiment, the diameter of the wires forming the cover layer is larger than the diameter of the core strand and / or the diameter of the wires forming the strands.

[0013] Furthermore, as another preferred embodiment, a sheathing is provided surrounding the strand layer formed by a plurality of strands wrapped around the core strand, thereby reducing friction within the contact surfaces between the wires of the cover layer and the strand layer.

[0014] Another advantageous embodiment is the arrangement of filler wires between the strands wrapped around the core strand, thereby increasing the bearing surface of the wires formed in the cover layer.

[0015] Another advantageous embodiment provides that the wires forming the cover layer consist of a first group of wires and a second group, wherein the wires of the first group have a smaller diameter than the wires of the second group and the wires of the first group and the wires of the second group are arranged alternately within the cover layer along the circumference of the strand layer.

[0016] Regarding the laying direction, it is preferably provided that the wires of the cover layer are arranged running in the opposite direction to the laying direction of the strands. Alternatively, the wires of the cover layer can be arranged running in the same direction as the laying direction of the strands. A robust wire rope, which can be produced with conventional stranding machines and can also be used as a saw rope, has the construction 6x7+WSC+18.

[0017] Finally, a saw wire is also proposed based on the wire rope according to the invention, wherein the saw wire is formed from the aforementioned wire rope, which has a plurality of sleeves coated with a hard material. Preferably, the saw wire is a diamond wire, wherein the hard material is diamond. Such a saw wire is particularly suitable for the extraction and processing of natural stone.

[0018] The invention will be explained in more detail below with reference to a particularly preferred embodiment illustrated in the accompanying drawings. The drawings show:

[0019] Fig. 1 shows a cross-section through an exemplary wire rope designed according to the invention; and

[0020] Fig. 2 shows a perspective view of the exemplary wire rope from Fig. 1.

[0021] Fig. 1 shows a cross-section through a particularly preferred wire rope. The wire rope 10 has a core strand 20 and a strand layer of six strands 30 arranged spirally around the core strand 20. The core strand 20 and the strands 30 forming the strand layer are identical and each consist of seven wires 22, 32, which are preferably round wires. The portion of the wire rope 10 formed by the core strand 20 and the strand layer essentially corresponds to the structure of a stranded rope.

[0022] The outer layer consists of 18 wires 40 laid parallel to each other in a spiral pattern around the central axis of the wire rope, forming the outer layer, resulting in a total construction 6x7 + WSC + 18. The diameter of the wires 40 forming the outer layer is – as can be readily seen – larger than the diameter of the core strand 20 and the diameter of the wires 22, 32 forming the strands 30. Fig. 2 illustrates the construction of the embodiment shown in Fig. 1 in a perspective view, also with regard to the lay direction and lay length.

Claims

REQUIREMENTS 1. Wire rope (10) with a core strand (20), a plurality of strands (30) formed around the core strand (20) and a plurality of wires (40) arranged spirally around the strand layer forming a cover layer.

2. Wire rope (10) according to claim 1, characterized in that the wires (40) forming the cover layer are designed to bear load.

3. Wire rope (10) according to one of the preceding claims, characterized in that the metallic cross-section of the cover layer (40) is at least 35% of the metallic cross-section of the entire wire rope (10).

4. Wire rope (10) according to one of the preceding claims, characterized in that the diameter of a wire (40) forming the cover layer is at least 10% of the diameter of the entire wire rope (10).

5. Wire rope (10) according to one of the preceding claims, characterized in that the core strand (20) and / or the strands (30) wrapped around the core strand (20) are formed from a plurality of round wires.

6. Wire rope (10) according to one of the preceding claims, characterized in that the wires (40) forming the cover layer are round wires.

7. Wire rope (10) according to one of the preceding claims, characterized in that the diameter of the wires (40) forming the cover layer is larger than the diameter of the core strand (20) and / or the diameter of the wires (22, 32) forming the strands (30).

8. Wire rope (10) according to one of the preceding claims, characterized by a sheathing surrounding the plurality of strands (30) formed around the core strand (20).

9. Wire rope (10) according to one of the preceding claims, characterized by filler wires arranged between the strands (30) wrapped around the core strand (20) and the wires (40) forming the cover layer.

10. Wire rope according to one of the preceding claims, characterized in that the wires forming the cover layer consist of a first group of wires and a second group, wherein the wires of the first group have a smaller diameter than the wires of the second group and the wires of the first group and the wires of the second group are arranged alternately within the cover layer along the circumference of the strand layer.

11. Wire rope (10) according to one of the preceding claims, characterized in that the wires (40) of the cover layer are arranged in a direction opposite to the laying direction of the strands (30).

12. Wire rope (10) according to one of claims 1 to 10, characterized in that the wires (40) of the cover layer (7) are arranged in the same direction as the laying direction of the strands (30).

13. Saw wire with a wire rope (10) having a plurality of sleeves coated with a hard material according to one of the preceding claims.

14. Saw wire according to claim 13, characterized in that the saw wire has a Diamond wire rope is used, where the hard material is diamond.

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