CH707004A2

CH707004A2 - Wire rope and an intermediate piece for a spliced wire rope.

Info

Publication number: CH707004A2
Application number: CH01727/12A
Authority: CH
Inventors: Christof Nater
Original assignee: Fatzer Ag
Priority date: 2012-09-17
Filing date: 2012-09-17
Publication date: 2014-03-31
Also published as: EP3255206A1; ES2870016T3; EP3255206B1; EP2708642B1; CN103866596A; JP6309727B2; CN103866596B; EP2708642A2; JP2014066001A; EP2708642A3; CH707004B1

Abstract

In a wire rope, a plurality of strands (15) consisting of stranded wires (16) are provided, which are stranded around a plastic core (11) and between them elongated inserts (12) are arranged. These inserts (12) extend approximately as far as the outer circumference of the wire rope (10), and have a radius adapted to the healds (15) in the area in which the strands (15) are in contact. The stranded strands (15) lie directly over the plastic core (11) over a certain circumferential region (11 '), while the inserts (12) are arranged on the inside with a spacing (a) from the plastic core (11). This wire rope is optimally designed for an extended service life.

Description

Description: The invention relates to a wire rope according to the preamble of claim 1, as well as to an intermediate piece for a splice connection of a wire rope.

BACKGROUND OF THE INVENTION [0002] In a generic wire rope for conveying systems according to the printed document EP-A-1 040 221, filling elements are provided between each adjacent pair of strands which consist of a polymer or elastomeric material and have an oriented molecular structure. A widened foot section is assigned to each of these filling elements, which fills the space formed between two strands and the core and can rest on the central core.

[0003] In the case of a steel wire stranded cable according to the printed specification EP-A-0 685 592, a strip-shaped insert extending over the length of the cable is respectively arranged between two adjacent wire strands. This is composed of a head part, a foot part and an intermediate middle part. The foot parts are designed in the shape of a wedge with an angle which opens against the strands.

The object of the present invention is, on the other hand, to improve a wire cable of the type mentioned at the outset in such a way that with it a longer service life can be achieved without a plurality of production walls and the noise generation arising during operation, such as vibrations, can be reduced.

[0005] According to the invention, this object is achieved by a wire rope according to the features of claim 1 or by an intermediate piece according to the features of claim 13.

This wire cable is thus optimally designed with respect to an extended service life, since with these measures, the stranded strands can be supported directly over the plastic core over a certain circumferential range, or the inserts can be placed on the inside at a distance from the plastic core Surprisingly positive test results have been achieved.

[0007] Further advantageous details of this wire rope within the scope of the invention are defined in the dependent claims.

With this intermediate piece according to the invention for the use in splicing a wire rope, a uniformly increasing and decreasing diameter of the rope of a maximum of 8% of the nominal diameter results, which has a positive effect on the running of the rope. Furthermore, these spacers are easy to splic use.

[0009] Exemplary embodiments as well as further advantages of the invention are explained in more detail below with reference to a drawing. It shows:

1 is a cross-sectional view of a wire rope according to the invention;

FIG. 2 is a partial perspective view of the wire rope in the splicing region joined to the two ends; FIG.

FIG. 3 shows a longitudinal section of the wire rope in the region according to FIG. 2;

FIG. 4 is a cross-sectional view of the wire rope taken along line IV - IV of FIG. 3; and

FIG. 5 shows a perspective view of an intermediate piece inserted at the splicing point according to FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a wire rope 10 with a plurality of strands 15 made of stranded wires 16, which are stranded around a synthetic material element 11 and between which elongated inserts 12 are arranged. These inserts 12 extending over the entire seam length are shaped in their cross-section in such a way that they extend approximately as far as the outer circumference of the wire rope 10. They are provided on the outer circumference with a radius R approximately corresponding to half the cable diameter in order to form approximately a uniform outside diameter together with the strands 15. In the area in contact with the strands 15, they have a radius corresponding to the healds 15 on both sides.

[0011] Such wire ropes 10 are used, in particular, as pulling or conveying cables with high load requirements, for example in the case of ropeways which are suspended on a stationary supporting cable and are connected to a traction cable. Pulling or conveying cables are usually guided around rollers at the upper and lower stations and are embodied as endless cables by a so-called splicing of their ends or are held together by an end fastening, which is not shown in detail.

According to the invention, the stranded strands 15 lie directly on the plastic core 11 over a certain circumferential region 11 ', whereas the inserts 12 are arranged on the inside with a spacing a from the plastic core 11.

In the case of a respective strand 15, in which it rests directly on the plastic element 11, this circumferential region 11 'corresponds to an angular range a of preferably between 40 ° and 60 ° when six strands are used.

The spacings a between the inserts 12 and the plastic elements 11 are each dimensioned in such a way that these at least approximately correspond to an extent which is produced by the flow of the plastic elements 11 directed in the radial direction outwards after a certain initial operating time of the wire cable. This expansion varies according to the diameter of the core and the load on the wire rope in the millimeter range.

The inserts 12 each have a thickness d ', which is greater than the thickness d in the narrowest region of the respective insert 12, with its inner-side end part 12' between two strands 15, these inner-side end parts 12 'being arranged outside an imaginary end portion 12' Circle 14 end at the inner sides of the strands 15, as indicated by dashed lines. This inner-side end part 12 'of the inserts 12 is rounded in each case, but could also be elliptical, half-polygonal or even flat.

The plastic element 11 is provided with grooves 11 "opposite these end parts 12 ', which are each formed with approximately the same radius as the end parts 12' of the inserts 12 and thereby helically around the plastic elements 11, with the same slope As the strands 15 are twisted so as to ensure overlapping between the grooves 11 '' and the end portions 12 'over the entire strand length.

The plastic element 11 is of rod-shaped construction and is heated during manufacture in such a way that the strands 15 with their corrugated surface structure result in a form-fitting abutment by deforming the peripheral region 11 'of the plastic element 11.

[0018] Depending on the application, the plastic element 11, made of a rod made of a flexible plastic, can be composed of at least one layer of a readily deformable plastic material surrounding this rod. However, the rod may also consist of several plastic layers.

When connecting the two ends of a wire rope for the purpose of producing an endless wire rope by means of a splicing which is conventional per se, essentially the following steps are carried out: 1. The two wire cable ends are juxtaposed over a certain length. 2. At each wire end, three strands 15, preferably lying next to one another, are removed over this particular length, the same strands being unwound at both ends. 3. Then, the plastic elements 11 are likewise removed and cut off over the same length as these strands 15 at both wire ends. 4. Subsequently, these three juxtaposed strands are cut off at both ends at the location of the cut-off plastic elements, Advantageously the first removed strands at one end and the three unwound strands at the other end. 5. Subsequently, the three longer strands of the one rope end, which are longer than the core, are individually wound over the particular length, instead of the same cut-off strands, at the other end of the rope and vice versa. 6. These ends of these inserted and / or unwound strands are selected on both sides at three different splicing points 10 'on the rope, which are sufficiently far apart. They have a sufficient free-protruding length, each of which is wrapped with a rubber band, rubber-sheathed cords and / or the like. 7. Then, each of the plastic pipes is fixed at these six splicing sites 10 ' Each by a predetermined distance by means of appropriate tools and cut off. 8. Then, at these six splicing sites 10 ', each of the two protruding strands 15', 15 "is screwed into the center of the rope in the one or other direction by means of corresponding tools, as far as the point where the soul is cut off And then the rope is spliced.

[0020] Thus, a splice type known per se has been explained in detail. However, there are other types of splices which are also encompassed by the invention, but are not explained in more detail.

According to the invention, as illustrated in FIGS. 2 to 5, at these six locations 10 ', in which these two strands 15', 15 "are respectively screwed in one or other direction into the center of the cable, A preformed intermediate piece 20 is inserted in each case so that the outer diameter of the wire cable 10 at this point 10 'can be a maximum of 8% according to the standard.

In this preformed intermediate piece 20, grooves 22, 23, 24 extending in its longitudinal direction and a recess 21 are provided, the strands 15 being inserted or guided in the grooves. Said recess 21 and the grooves 22, 23, 24 are each provided with a radius which remains the same over the entire length and which, with the recess 21, corresponds to half the diameter of the core 11, or in the case of the grooves 22, 23, 24, Strands 15.

In this case, a thin wall 20 'is assigned to this elongated intermediate piece 20 at its two ends, which ends come to lie with the strands 15', 15 ", which extend in the center from the outside as shown in FIG. On the other hand, this intermediate piece 20 is correspondingly thicker towards the center than at the ends,

Claims

With a continuous change in the thickness from outside to inside. The walls 20 'are designed as a function of the sea diameter meter. Within the scope of the invention, these strands 15 ', 15 ", which are each inserted into the center, are wrapped with a splicing tape 17 over the region located in the interior so that these strands 15', 15" have a higher coefficient of friction on the one hand And on the other hand, that their diameters each approximately correspond to those of the plastic elements 11. This splice tape 17 is a reinforced rubber or the like. Depending on the number of strands per rope, this number of intermediate pieces 20 to be inserted can vary. In the case of a rope provided with seven or eight strands, eight such intermediate pieces would then be provided with a different shape. [0026] The invention is sufficiently demonstrated with the above exemplary embodiment. However, it could be illustrated by other variants. Thus, the intermediate piece could be reinforced with one or more wires in its interior. In addition, it could have a separate layer on the outside, which would consist of a material through which the strands in this layer would be optimally embedded and lubricated. claims

1. A wire rope comprising a plurality of strands (15) consisting of stranded wires (16) which are stranded around a plastic core (11) and between them elongate inserts (12) extending approximately up to the outer circumference of the wire rope (10) (15) are arranged directly on the plastic core (11) over a certain circumferential area (11 ') in the region in which the strands (15) are in contact with the strands (15) , While the inserts (12) are in each case arranged on the inside at a distance (a) from the plastic core (11).

2. The wire cable as claimed in claim 1, wherein the radial spacings (a) between the inserts (12) and the plastic elements (11) are dimensioned in such a way that they correspond at least approximately to one extent, (11) in a radial direction towards the outside after a certain initial operating time of the wire cable (10).

3. The wire cable as claimed in claim 1, wherein the inserts each have a thickness which is greater than the thickness (d ') between the two ends of the inner-side end part (12') ) In the narrowest region of the respective insert (12), said inner-side end parts (12 ') terminating outside an imaginary circle (14) at the inner sides of the strands (15).

4. The wire rope according to claim 3, wherein the inner-side end part of the inserts is rounded and the grooves are provided with an approximately equal radius opposite the plastic elements In the form of a helical shape around the plastic element.

5. The wire rope according to claim 1, wherein the circumferential area (11 '), in which the stranded strands (15) lie directly on the plastic element (11), is subjected to an angular range (a) when six strands are used, Of preferably up to 60 °.

6. The wire rope as claimed in claim 1, wherein the plastic core is of rod-shaped design and is heated during manufacture in order that the strands (15) with their corrugated surface structure can be deformed by deformation of the peripheral region (11 ' ) Of the plastic core results in a positive interlocking.

7. The wire rope according to claim 6, characterized in that the rod-shaped plastic element is composed of a flexible plastic and at least one layer of a deformable plastic surrounding the latter.

8. The wire rope according to claim 1, wherein the inserts (12) are provided with a radius (R) which corresponds approximately to half the rope diameter in order to provide an approximately uniform outer circumference together with the strands (15) form.

9. The wire cable as claimed in claim 1, wherein the plastic cable is twisted and cut off over a predetermined distance, and in each case two strands, in the case of splicing points (10 ') of the wire rope (10) (20 ') is inserted into the center of the cable (15', 15 ") in the one or other direction, so that the outer diameter of the wire rope (10) at this point (10 ') is minimally greater.

10. The wire cable as claimed in claim 9, characterized in that, in the case of the preformed intermediate piece (20), the recess (21), which extends in its longitudinal direction and has a radius corresponding to that of a braid (15 ', 15 "), and additionally (22, 23, 24), which are distributed all around, are provided in which the strands (15) are inserted or guided.

11. The wire cable as claimed in claim 9, wherein a thin wall is assigned to this elongated intermediate piece at its two ends, said strand being provided with a plurality of strands extending from the outside into the center, (20) against the center is correspondingly thicker than at the ends, this being the case when the thicknesses are varied continuously from the outside to the inside.

12. The wire cable as claimed in claim 9, wherein the strands (15 ', 15 ") which are screwed into the center of the wire rope (10) are wrapped with a plastic tape (17) over the central region.

13. The intermediate piece for a spliced wire cable as claimed in claim 1, wherein the longitudinally extending intermediate piece is preformed in such a way that it extends in its longitudinal direction, as well as additionally around all-round grooves , 23, 24) into which the strands (15, 15 ') can be inserted.

14. The intermediate piece according to claim 13, characterized in that the intermediate piece (20) is correspondingly thicker towards the center than at the ends with the thin walls (20 '), with a continuous variation of the thickness from the outside to the inside ,

15. The intermediate piece according to claim 13, wherein said recess and the grooves are each provided with a constant radius over the entire length in the cross-section.