EP0685592B1 - Steel wire rope with multiple strands - Google Patents

Abstract

A cabled steel wire rope with at least four twisted wire cables (2) has a tape shaped insert (4) between adjacent cables (2). The insert (4) has a head region (6), a foot region (8), and a waisted centre region (7) with concavities (9) on both sides into which the cables nestle. The head region (6) is at the periphery (14) of the rope. The foot regions (8) are not connected with each other. <IMAGE>

Description

The invention relates to a steel wire strand rope with six helical stranded wire strands.

Wire ropes are manufactured in a conventional manner so that steel wire strands in a stranding machine usually helical around one round core - also called soul - are wound. During the stranding the initially round core deforms under the radial pressure the wire teats, whereby the rope gets its final shape.

The rope extensions that take place later in operation are unsatisfactory and related maintenance measures the necessary rope tension. In addition, unwanted arise Rope vibrations that affect the structural and machine parts supporting the rope transmitted, as a result of the running on the support rollers, helical rope surface, which in many cases is the possible rope speed and thus limits the transport capacity.

From GB-A-27736 it is already known between two neighboring ones Wire strands to arrange a longitudinally extending insert made of steel. The middle part of these inserts contains two in cross-section opposite concave curvatures constricting the cross section, against which the wire strands lie. The headboard of the inlays is arched and is located essentially around the perimeter of the rope. The Foot parts of the inserts are flat and rest on a central one Hexagon core.

The German patent application DE-A-31 49 783 shows a wire rope several strands arranged around a round core rope. Between a filler element is arranged on each strand. The head of these fillers is curved and adapted to the circumference of the wire rope. The foot each of these filling elements has a concave curvature and lies against the core rope, which is round in cross section.

The object of the invention is to achieve a steel wire stranded rope to create that in comparison to conventional ropes in operation undergoes a much smaller permanent extension when running is less vibration over rollers and has a longer life.

This task is characterized by the characteristics according to the Part of claim 1 solved.

With this training, a precisely defined position of the Wire strands and thus the exact adherence to the lay length achieved. The band-shaped inlays prevent the Wire strands can migrate to the center, reducing the pitch of the Helix (lay length) is fixed, so that in operation one opposite conventional ropes much less permanent rope extension arises. The ones between the individual wire strands Inserts separate adjacent wire strands so that the Rope bends inevitable compensation shifts of the Wire strands can take place more easily. In addition, it follows a reduction in the stress on the individual stranded wires and thus an increased lifespan of the rope.

The head parts of the that extend to the circumference of the rope Deposits double the contact and support points when the rope runs over support or guide rollers. This results in a quieter vibration-free run, because when crossing support rollers the vibration excitation is reduced or eliminated becomes. This enables the rope speed to be increased.

Exemplary embodiments of the invention are shown in the drawing, which are explained in more detail below.

Fig. 1

einen Querschnitt durch eine erste Ausführungsform eines Stahldraht-Litzenseiles

Fig.2

eine Seitenansicht einer Einlage

Fig.3

eine Ansicht des Stahldraht-Litzenseiles mit schrägem Stirnanschnitt

Fig.4

einen Querschnitt durch eine zweite Ausführungsform ohne Kern

Fig.5

einen Querschnitt durch eine dritte Ausführungsform eines Stahldraht-Litzenseiles mit verbreitertem Kopfteil und ohne Kern.

Show it:

Fig. 1

a cross section through a first embodiment of a steel wire strand rope

Fig. 2

a side view of an insert

Fig. 3

a view of the steel wire strand rope with oblique face cut

Fig. 4

a cross section through a second embodiment without a core

Fig. 5

a cross section through a third embodiment of a steel wire strand rope with widened head part and without core.

The steel wire stranded rope 1 shown in cross section in FIG. 1 is for use as a conveyor or pull rope, for example in cable car systems certainly. This steel wire strand rope 1 contains one A plurality of wire strands 2, at least four, preferably six or eight, in special cases more such wire strands 2 can be present.

In the illustrated embodiment, each of the wire strands 2 seven stranded wires; however, depending on the application, a larger or smaller number of such stranded wires to form a stranded wire 2 be stranded.

In the middle of the rope is a core that extends in the longitudinal direction of the rope 3 available. There are between the individual wire strands 2 elongated, helically shaped according to the wire strand shape Deposits 4, which are evenly arranged in a circle and with the core 3 consisting of an elastomer are not connected.

The individual inserts 4 contain a head part 6, a middle part 7 and a foot part 8. The head and foot parts 6, 8 each have a cross section thickened relative to the middle part 7. The middle part 7 contains - seen in cross section - two opposing concave Curvatures 9, the radius of which is the circumferential radius of the wire strands 2 corresponds.

Two adjacent wire strands 2 are thus against the arched Middle part 7 and are distanced from each other by this. Of the The headboard is rounded according to Fig. 1 and ends on the theoretical radius 14 of the rope 1. This results in between the helically extending wire strands 2 a doubling of Support points for idlers or support rollers when crossing rollers better smoothness.

The foot parts 8 are not connected to one another and opposite one another broadened the middle section. As a result of the radial pressure at the The originally round core 3 becomes stranded at the support points of the rounded foot part 8 deformed helically.

The inserts 4 preferably consist of an extruded one or extruded plastic tape profile. A is suitable for this glass fiber reinforced epoxy vinyl ester resin or polyethylene. It is however, it is also possible to make the inserts 4 from a different material to manufacture.

As can be seen from Fig.2, it may be appropriate to in the deposits to provide regular intervals with radial incisions 11. These incisions 11 extend from the head part 6 to approximately Middle of the middle part 7 and cause the reduction of because of Length difference between head and foot tensions.

In the embodiment shown in Figure 4, a central core waived. The foot parts 8 are close to the center 12 led, but not connected to each other.

5 shows an embodiment of the inserts 4, at which the head part 6 'is widened to such an extent that it has a bead 10 has, which is in a room consisting of the theoretically circular circumference of the rope and the periphery two adjacent wire strands 2. This space is from the head 6 ' the insert 4 approximately filled. This results in a Roll crossing instead of a line contact - as in Fig. 1 - one Surface contact.

In order to simplify the splicing, it can be useful to Core cross section in the embodiment of FIG. 1 too large choose how the diameter of a wire strand and the core in Remove the splice area.

Such a steel wire stranded rope is produced in the way that on a conventional wire stranding machine band-shaped profiled inserts 4 such as additional shaped wires, or wire strands handled and stranded together with the wire strands become.

Claims (2)

1. Stranded wire rope having six helically stranded wire rope elements, insert tapes (4) extending each longitudinal of the rope between two neighboured wire rope elements (2) with a head portion (6), a base portion (8) and an intermediate portion (7), whereby the intermediate portion (7) is formed in cross-section with two opposite, the cross section restricting concave depressions (9), to which the wire rope elements (2) are adjacent, each of the head portions (6) terminate at a diametrical circle (14) of the rope (1), and the base portions (8) are separated from each other, characterised in that each of the base portions (8) having a wedge shape with an opening angle of 60° to the outer circle of the rope, each inner termination of the base portions (8) are lying closed to a core (3), to which the wire rope elements are radial distanced, or the base portions (8) forming a central hole (12).
2. The stranded wire rope according to claim 1, characterised in that the insert tapes (4) are formed of extruded or of drawn epoxy-vinylester resin or polyethylene.

Images