EP1001075A2 - Sheathless conveyor cable for cable or municipal railways - Google Patents

Abstract

The cable (1) structure, without a covering, has shaped wire strands (2) at intervals round a plastics core (3). The strands (2) have a trapezoid cross section, with an air space (4) between them The cable uses six to eight strands (2), and pref. six, with a trapezoid cross section. The inner core (3) has a round cross section, with parts of its material forced outwards between the strands (2) through the cable twisting action, forming the air gaps (4) between the strands (2). Spacers can be inserted radially inwards into the air gaps (4) between the strands (2), as tensioners or support strands of a compact plastics or processed plastics fibers. The trapezoid wire strands (2) are compacted, with core inserts of compacted plastics or processed plastics fibers. The strands (2) can contain metal cores. The cable core (3) can have a softer outer plastics material than its center section.

Description

The invention relates to a casing-free conveyor rope for Cable cars or light rail vehicles, with around a plastic core or synthetic fibers arranged at mutual intervals Strands.

A problem with such conveyor ropes is that the strands on the outer circumference of the rope do not guarantee a round surface can, as required for a smooth run over rollers would. Rather, strand-induced vibrations occur and thus to loud rolling noises, which in particular with City cable cars are undesirable. A more round surface with a correspondingly large number of - thin - Strands can be reached, because then a circumference is better approximated can, however, increases the number of strands the disadvantage that the inside of the strands Core insert space therefore a comparatively large cross-section which, conversely, means that for a given Rope diameter of the metallic cross section of such Rope with more strands compared to a rope with less Strands is reduced. It is also characterized by a high Number of strands makes it difficult or even impossible to splice the rope made.

To achieve round surfaces, therefore, has already been proposed, together with the steel strands, also plastic tapes, especially with a more or less dumbbell-shaped Cross-section, to strand, cf. for example CH 688 915 A, the CH 685 592 A or DE 31 49 783 A and the EP 707 108 A. However, studies have shown that in these ropes with the plastic tape inserts initially A round surface can be achieved, however, when in use after a relatively short time the plastic straps between the Strands are rubbed through and that the tapes are on the outside the rope - due to an unavoidable stretch during operation of the plastic strips in comparison to the steel strands - protrude and tear off. The plastic straps come loose from the Rope out, so that again the non-circular surface with which Consequence of the rolling noises, results. There is also the danger the plastic straps coming loose on rollers or roller brackets, causing the rope to pop out from the rollers and to serious cable car accidents can lead. These known ropes could therefore not be practical Use.

The aim of the invention is to provide such a rope for Cable cars and light rail vehicles with comparatively few strands to provide the nonetheless a round surface with has a good approximation, and this with large metallic cross sections. Training is also sought, where the strands are not against each other (or against plastic tapes) can scrub so that trouble-free operation over long times can be ensured.

The rope according to the invention of the type mentioned is characterized in that the wire strands as shaped strands are formed, which are substantially trapezoidal Have cross-section, and that between the strands Air gap is provided.

It is an advantage in such a stranded wire rope with trapezoidal strands in cross section that comparatively large metallic cross sections and thus high breaking forces achieved can be, and this provided a comparative round surface, and ensuring an air gap between the strands so that the strands are not against each other can chafe. Subsequently, the rope is made in this way can also be used over long operating times and it will a significant reduction in the vibrations induced by stranded wire and thus the rolling noise is achieved. Because the number of Strands can remain relatively low, preferably six, seven or eight strands may be used, moreover also ensured that the rope can still be spliced remains, whereas ropes with a higher number of strands in the Practice can no longer be spliced.

It should be mentioned that shaped ropes are known per se are, however, these are usually so-called triangular ropes for other uses, e.g. in mining, at which the individual strands have an approximately triangular cross section, with very rounded corners, have; these known Triangular ropes also have a relatively non-circular shape Surface and cannot be used as conveyor ropes for cable cars.

A wire rope with triangular strands is e.g. from the Known from DE 1 029 627 C, in which a star-shaped cross section Rubber or plastic insert is provided, the Star tips should protrude over the circumference. Such a thing Wire rope would be for use as a conveyor rope for cable cars or trams are unsuitable, especially since the insert with the protruding star tips in operation when running over rollers would be deformed and torn open and ultimately on the roles could impose.

In GB 1 394 362 A there is also a prestressing element for prestressed concrete described, with approximately trapezoidal cross-sections are shown for single elements, but it does not wire strands, but wires. Moreover there is a covering that is used as a conveyor rope for Against cable cars etc.

GB 2 126 613 A describes shaped strands with trapezoidal ones Cross sections, however, for a rope with the strands in a plastic or rubber sleeve are enclosed, and at which the strands are preferably also made of plastic are. The entire rope is also in one Hose cover included. A suitability as a conveyor cable for cable cars or trams are accordingly not available either.

With a conveyor rope according to the invention, the shaped strands can in a conventional manner by means of rollers, with the help of Drawing dies or compacted with the help of a hammer mill, etc. the final shape is also achieved. Combinations of these known ones can of course also be used Techniques such as a combination of a drawing and rolling tool, be applied.

To the air gap between the form strands, which is a mutual To prevent chafing of the stranded wires, in operation too secure, the shaped strands in the hoist rope can also counter Lateral slipping (in the circumferential direction of the conveyor rope) be secured, and this can be particularly advantageous can be achieved by the fact that the essentially round core with a radially protruding cross section, areas of material formed by deformation during stranding has, which in the air gaps between the Formed strands protruding Form spacers. With this training, the Spacers simply in the course of production by deformation formed by peripheral material areas of the core.

On the other hand, however, it is for a particularly good backup the position of the shaped strands favorable when in the air gaps spacer in the form of Bridles or braids are inserted. The spacers, i.e. Bridles or support strands can be made of compact plastic, such as polypropylene or polyamide However, they can also be made from processed synthetic fibers, e.g. made of polypropylene, Polyamide or polyester fibers. On it would also be conceivable here, particularly durable fibers, such as such as Kevlar, to use for the support strands.

The shaped strands can have different inserts; for example, for ease of manufacture, when the trapezoidal shaped cores are made of compact Have plastic or made of processed synthetic fibers. Polypropylene is used as the plastic material, Polyamide and polyester etc. in question. For particularly high ones Strengths can also be provided that the Trapezoidal shaped strands have metallic core inserts.

For a more or less positive storage of the Cross-section trapezoidal shaped strands it is also advantageous if the core is softer than its core insert Plastic encapsulation is provided.

Fig. 1 einen schematischen Querschnitt durch ein erfindungsgemäßes Förderseil, wobei zu Vergleichszwecken zusätzlich zu den im Querschnitt trapezförmigen Formlitzen auch einige im Querschnitt kreisförmige, herkömmliche Litzen eingezeichnet sind; und

die Fig. 2 bis 5 mehr im Detail Querschnittsdarstellungen von vier Ausführungsbeispielen des vorliegenden Förderseils.

The invention is explained in more detail below on the basis of particularly preferred exemplary embodiments illustrated in the drawing, to which, however, it is not intended to be limited. They show in detail:

Figure 1 is a schematic cross section through a conveyor rope according to the invention, wherein for comparison purposes in addition to the trapezoidal shaped strands in cross section, some conventional strands circular in cross section are shown. and

2 to 5 show cross-sectional representations of four exemplary embodiments of the present conveyor cable in more detail.

The shown in the drawing in the individual Figs. 1 to 5 Conveyor ropes 1 are each constructed with strands 2, the under Leave radial air gaps 4 arranged around a core 3 are, and which instead of the previously with conveyor ropes for Cable and light rail vehicles usual circular cross-section one have approximately trapezoidal cross section. For example six such shaped strands 2 are provided for each rope, which, as studies have shown, an optimal compromise between the contradicting demands, on the one hand the largest possible metallic cross-section (in view to ensure high breaking forces) and on the other hand the outside or surface of the rope as round as possible achieve. It would be in itself for such a round surface cheap, as many as possible to better adapt the circular shape To attach strands 2, but then naturally a small one Should have a cross-section; on the other hand, braids secure with large Cross section the desired large metallic cross section and thus the high strength, but then the circular shape of the cross-section cannot be approximated so well. It has shown that for the present purposes six to eight strands 2 around the core 3 are cheapest, in particular six strands 2 are preferred. It should also be mentioned here that with a higher number of strands a splicing of the rope 1 is practically impossible, so that also the number of strands is capped.

By forming the strands 2 as shaped strands with approximately trapezoidal cross section, even if comparatively there are few strands per rope, an improved roundness of the Seils achieved, as can be seen in particular from the illustration in Fig. 1 shows where with 2 'circular strands in cross section are indicated, whereby it can be seen that the outermost points corresponding to the circles of adjacent circular strands 2 ' a center angle of 60 ° apart, whereas in the case of the trapezoidal shaped strands 2 those adjacent to each other Points where the trapezoidal cross-section lines in the outer imagined Circular line 5 of the conveyor cable 1 merges, for example only according to a central angle of 15 ° or 20 ° apart lie, as shown in Fig. 1 at x.

Another advantage of the trapezoidal cross section of the shaped strands 2 results from the fact that on the radially inner side of the shaped strands 2 a comparatively large, stable contact surface or Contact surface to the core 3 is obtained, which is a shift the strands 2 counteracts in the circumferential direction relative to the core 3. As a result, the free column 4 can be better adhered to even if these columns 4 are free, i.e. in them seen at least essentially over the radial extent there are no plastic inserts or the like have proven to be disadvantageous for the purposes of a rope. Compliance with the air gaps 4 is also during operation on the other hand, it is important that the strands 2 are in operation do not rub against each other and be damaged.

2 to 5 are four different, concrete exemplary embodiments for hoisting ropes 1 with a trapezoidal cross-section Molded strands 2 illustrated. All four Embodiments plastic or synthetic fiber inlays 6 in Core 3 provided, these plastic or synthetic fiber inserts 6 each with a softer plastic coating 7 are provided.

Around the core 3 in the embodiments according to FIG. 2 to 5, as mentioned, each have six shaped strands 2 with one trapezoidal cross section attached, this Form strands 2 in the designs according to FIGS. 2 and 4 with a own plastic or synthetic fiber insert 8 are provided to around which the wires 9 of the shaped strands 2 are attached.

In contrast, in the embodiments according to FIGS. 3 and 5 Metal inserts 10 are provided in each of the shaped strands 2 in order to achieve the the stranded wires 9 are arranged around. The metal inserts 10 3 and 5 can be made of steel wires according to ÖNORM N 9502 or 9503, but they can also be made of wires other metals or metal alloys.

The stranded wires 9 themselves can be made in a comparable manner Steel wires or from wires of other metals or metal alloys be educated.

The trapezoidal shaped strands 2 are separated with a Drawing or rolling tool or a combination of drawing and Rolling tool produced, an example of such Manufacture and compression of shaped strands, albeit in connection with a triangular strand, for example in the US 5 765 357 A is shown in a very special form. A detailed description of the manufacture of the shaped strands 2 can therefore be superfluous here.

2 and 3 are the Molded strands 2 pressed into the plastic of the encapsulation 7, with 2 material areas between the trapezoidal shaped strands 11 are pushed out by the deformation. These material areas 11 form spacers for the shaped strands 2, wherein these spacers or material areas 11 radially on the inside Project into the air gaps 4 between the shaped strands 2. The shaped strands 2 are thereby more or less form-fitting on the inside fixed relative to the core 3, so that a mutual Rubbing or chafing the shaped strands 2 despite the presence the air gap 4 is reliably prevented.

In the embodiments of the conveyor cable 1 according to FIG. 4 and 5, however, are separate spacers in the form of so-called. Snaffle bridles or support strands 12 present radially in between the stranded wires 2 lie and are stranded together with these. These bridles or support strands 12 exist, for example also made of compact plastic or processed Synthetic fibers, similar to the "soft" core inserts 6 and 8 of the Core 3 or the form strands 2. As a material for these support strands or bridles 12 and for the "soft" core inserts mentioned 6 or 8 can be a compact plastic, such as polypropylene or polyamide, but it can also processed synthetic fibers, such as polypropylene, polyamide or Polyester fibers are used. Of course you can other fiber materials, such as Kevlar material used are, depending on the desired properties of the manufactured Conveyor rope 1.

The material of the core encapsulation 7 of the conveyor cable core 3 can be, for example, a so-called lo-stretch material, for example a polypropylene, or a polyamide, polyethylene u. the like

In the manufacture of the trapezoidal shaped strands 2 is a Degree of compaction of a maximum of 10% is sufficient, and thus can the usual demands of authorities are also met.

As mentioned, the conveyor cable 1 described has a comparative large metallic cross section and thus a high one Strength or high breaking forces; is nonetheless despite the relatively small number of strands (six, seven or eight - Strands) a surface with the trapezoidal shape of the strands 2 good roundness can be achieved, which makes it suitable as a rope Cable cars or city cable cars are secured. The consequence of Well approximated roundness of the surface is essential Reduction of the strand-induced vibrations in operation, whereby moreover, the rolling noise is significantly reduced. The shaped strands 2 are only through the air gaps 4 - at least over their essential radial extension - separated from each other, so that no deposits can fall out between the strands 2, which represent a high risk of accident in the company; none the less the strands 2, with appropriate dimensioning of the air gap widths, do not rub against each other, and all the more if them through the spacers in the form of plastic material areas 11 or bridles or support strands 12 in their position relative are secured to each other.

Claims (11)

Sleeveless conveyor rope (1) for cable cars or light rail vehicles, with around a core (3) made of plastic or synthetic fibers in spaced strands (2), characterized in that that the wire strands are formed as shaped strands (2) which are of a substantially trapezoidal cross-section have, and that between the shaped strands (2) Air gap (4) is provided. Conveyor rope according to claim 1, characterized in that six to eight shaped strands (2), preferably six shaped strands (2) are provided with a trapezoidal cross section. Conveyor rope according to claim 1 or 2, characterized in that the provided within the form strands (2), in cross section essentially round core (3) protruding radially, by deformation of material areas (11) formed during stranding having in the air gaps (4) between the shaped strands (2) form protruding spacers. Conveyor rope according to claim 1 or 2, characterized in that radially in the air gaps (4) between the shaped strands (2) spacers in the form of bridles or support strands (12) are inserted. Conveyor rope according to claim 4, characterized in that the Support strands (12) consist of compact plastic. Conveyor rope according to claim 4, characterized in that the Support strands (12) consist of processed synthetic fibers. Conveyor rope according to one of claims 1 to 6, characterized in that the trapezoidal shaped strands (2) compact are. Conveyor rope according to one of claims 1 to 6, characterized in that the trapezoidal shaped strands (2) core inserts (8) made of compact plastic. Conveyor rope according to one of claims 1 to 6, characterized in that the trapezoidal shaped strands (2) core inserts (8) from processed synthetic fibers. Conveyor rope according to one of claims 1 to 6, characterized in that the trapezoidal shaped strands (2) are metallic Have core deposits (8). Conveyor rope according to one of claims 1 to 10, characterized in that that the core (3) with one against its Provide core insert (6) with softer plastic coating (7) is.

Images