EP0707108B1 - Plastic insert for wire rope - Google Patents

Abstract

A plastic lining for a wire rope is for a reciprocal distancing of two adjacent wire cords, which are arranged in a wreath shape. Each lining (4) has a middle section (7), which is concave on both sides and is located between a head and a base section (6, 8). The cross section of the middle part (7) is reduced compared to the head and base sections (6, 8) and is reinforced by means of a fabric integrated into the lining material. Pref. the lining is made of glass fibre-reinforced epoxy vinyl ester resin or polyethylene.

Description

The invention relates to a steel wire strand rope according to the preamble of claim 1.

The aim of wire ropes is to have the smallest possible diameter. Each the more compact the rope construction with multiple strands, the less is the wall thickness of the middle sections of the insert, which are the strands distance each other. In operation, however, this centerpiece is high Exposed to stress. Several have an effect on these deposits Force components with a partly changing direction of force, in particular Compressive, bending and torsional forces.

The German laid-open specification DE-A-31 49 783 - of which in the preamble has run out - shows a wire rope with several around a round one Core rope strands arranged around. There is one between each strand flexible insert element arranged. The head of these insert elements is curved and the middle part is adapted to the circumference of the wire rope. The base of these insert elements each has a concave curvature and lies against the core rope, which is round in cross section. Two wire-shaped Reinforcing cores are integrated in the insert elements.

A textile originates from the German utility model DE-U-90 10 258 Surface sheet for reinforcing plastic parts. Doing so low elongation (crimp) in both warp and weft directions is aimed for.

With the invention, the object is to be achieved, the center piece of this Reinforcing the plastic insert so that it is used in the manufacture of the rope helical deformation and the high stresses that occur during operation can withstand and the rope has a long service life Has.

This object is achieved by those mentioned in the characterizing part of patent claim 1 Features resolved.

In contrast to adding individual fibers to reinforce the inserts, for example carbon fibers for the insert plastic material has the flat insert material designed as a fabric Advantage that it is attached to the most stressed areas and can be integrated into the insert material, with it this is inextricably linked. This is the inseparable connection that the reinforcement fabric together with the material the insert is extruded into one unit.

The long lifespan of the rope is in addition to the fabric insert supported by the fact that the foot parts of the inserts on the foot part each have one Have a wedge shape, which results in an improved flexibility of the rope, so that the compensating displacements that are unavoidable when bending a rope the wire strands can take place more easily and thereby the force concentration the strands are better distributed on the inserts.

Fig. 1

einen Querschnitt durch ein Stahldraht-Litzenseil mit zwischen den Drahtlitzen eingelegten Kunststoff-Einlagen

Fig. 2

eine einzelne, bandförmige Einlage in isometrischer Darstellung

Fig. 3

einen Querschnitt durch eine Einlage mit beidseitiger Gewebeverstärkung

Exemplary embodiments of the subject matter of the invention are shown in the drawing. Show it:

Fig. 1

a cross section through a steel wire strand rope with inserted between the wire strands plastic inserts

Fig. 2

a single, ribbon-shaped insert in isometric representation

Fig. 3

a cross section through an insert with double-sided fabric reinforcement

The steel wire stranded rope 1 shown in Fig. 1 with a circular Perimeter 14 contains six helical wire strands 2. Between There are two adjacent wire strands 2 made of plastic existing insert 4. These inserts 4 each have a wedge-shaped Foot part 8 with an outward opening angle of 60 °, one Headboard 6 and one in between horizontal web-shaped middle part 7. The foot parts 8 each contain an inclined surface 15 on both sides to form a Wedge shape. The foot parts 8 lie around a free center 12 against each other. The cross sections of the head or foot part 6, 8 are thickened over the central part 7. The middle part 7 contains Cross-section seen - two concave arches facing each other 9, the radius of which corresponds to the circumferential radius of the wire strands 2. Two adjacent wire strands 2 are thus against the arched middle part 7 and are spaced from each other by this.

To improve the strength values of the inserts 4, 4 ' this at least in the area of the central part 7 on both sides with a Fabric 16 reinforced. The one that is closest to the surface Fabric 16 is inextricably linked to the material of the insert 4, is therefore integrated into this. The fabric preferably consists of Plastic fibers, made of glass fibers or natural fibers.

The inserts 4, 4 'preferably consist of an extruded one Plastic band profile. As material for the inserts 4, 4 ' especially glass fiber reinforced epoxy vinyl resin or Suitable for polyethylene.

An embodiment variant is that the Tissue insert 16 'is in the plane of symmetry of the insert 4'. The fabric insert 16 'is shorter than the total height of the insert.

As a further embodiment variant, the fabric could also be and / or the foot part can be wrapped.

To further reinforce the inserts 4, 4 ', it is also possible to add them to be provided with longitudinal fibers or pieces of fiber.

During manufacture, the reinforcement fabric 16 is extruded together with the material of the insert, so that an indissoluble unit is created.
In the finished rope, the inserts 6 run helically together with the wire strands.

Claims (2)

1. Stranded wire rope or cable having six stranded wire rope elements, whereby between each of this two neighbouring stranded wire rope elements (2) is a insert mean (4), comprise a ribbon or tape made of plastics extending longitudinally the rope or cable having a head portion (6), a base portion (8) and further having an intermediate portion (7), between said head and base portions wherein the intermediate portion (7) in cross-section contains two opposite concave depressions (9), said depressions engaging against adjacent rope elements (2), whereby the head portions (6) terminate at a outer diametrical circle (14) of the rope or cable and the base portions (8) are separated from each other, wherein in the insert mean is a reinforcement element integrated, characterised in that the head portions form each a wedge with one at the outer side opening angle of 60°, so that the inner ends of the base portions limit the central line (12) and that as a reinforcement element a plastic material or a fibreglass fabric (16) is extruded together with the construction material of the insert mean, whereby the fabric (16) is arranged on both sides of the concave intermediate portion (7) or in the plane of symmetry.
2. Stranded wire rope or cable after claim 1, characterised in that the head portion (6) and/or the base portion (8) are reinforced with longitudinal fibres or fibre pieces.

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