WO2004083517A1

WO2004083517A1 - Steel-wire rope

Info

Publication number: WO2004083517A1
Application number: PCT/EP2004/002747
Authority: WO
Inventors: Roland Verreet
Original assignee: Casar Drahtseilwerk Saar Gmbh
Priority date: 2003-03-18
Filing date: 2004-03-17
Publication date: 2004-09-30
Also published as: EP1606449A1; EP1606449B1; DE502004008202D1; ATE410541T1; DE10311733A1

Abstract

The invention relates to a steel-wire rope, in particular to a standard product in which the external threads (6) of the strands (3) of an internal strand layer (2) are provided wit a plastic coating (7). The use of said plastic coating which is limited in the quantity and volume thereof in the steel-wire rope makes it possible to arrange an intermediate plastic layer used as a covering between the external strand layer and the internal strand layer at all thread crossings, and also between the internal strand layer and a central strand or a dipper strand layer.

Description

Description:

CÄSAR Drαhtseilwerk Sααr GmbH, D-66459 Kirkel (Germany)

"Wire rope"

The invention relates to a wire rope, in particular in normal design, with an inner strand layer, in particular stranded on a core strand, and a plastic padding under the outer strand layer.

Such wire ropes are known in various designs. The padding reduces the surface pressure at wire crossings between the outer and the inner layer of strands.

According to DE 22 02 823, a plastic intermediate layer is produced by extruding a thermoplastic plastic on a core rope and later stranding the outer strand layer while being pressed into the, again heated, plastic. DE 23 26 742 deals with the production of a plastic intermediate layer in a wire rope in parallel design, in which the inner and the outer strand layer have to be stranded in one operation. The plastic is previously extruded onto the individual strands of the inner strand layer. During stranding, it is heated and squeezed out to form a continuous intermediate layer. DE 39 34 270 proposes to achieve the same result only with a plastic-coated core strand. The plastic should squeeze out of the core strand between the strands of the inner strand layer as far as the outer strand layer.

The invention has for its object to provide another type of padding that requires the least possible effort. According to the invention, this purpose is achieved in that the outer wires of the strands of the inner strands are sheathed with plastic in a Dra tseil of the type mentioned.

With this local and quantitative introduction of plastic into the wire rope, a cushioning plastic intermediate layer is placed at all wire crossings between the outer and the inner strand layer and, moreover, between the inner strand layer and the core strand or a next inner strand layer. Overall, the effort for this is less than with all previous solutions. Wires can easily be covered with plastic during manufacture e.g. in the immersion process. Your warehousing in the wire rope factory only 15% of the weight portion in the wire rope does not cause significant cost. The production of the strands and their stranding is not burdened with complications. There are no special operations.

The plastic will usually be a not too soft thermoplastic. Thermosets are also possible.

The drawing shows an embodiment of the invention. It shows a wire rope in a cross section.

An outer strand layer 4 consisting of eight parallel lay strands 5 l + (6 + 6) + 12 is stranded on a core rope consisting of a parallel lay strand 1 1 + 8 + 8 as a core strand and a strand layer 2 composed of six parallel lay strands 3 1 + 8 + 8.

The outer wires 6 of the strands 3 are provided with a plastic sheath 7.

At all points 8 where the strands 3 come into contact with the strands 5 or the core strand 1, the plastic sheath 7 lies between the metal surfaces. It reduces the surface pressure.

The stranding of the outer strand layer in the normal manner can take place in the same direction of rotation as the inner strand layer with different lay length or in the opposite direction. In the latter case, the inventive measure would be particularly advantageous. The measure is also advantageous when the inner and outer strand layers are stranded in parallel.

Claims

Claim:

Wire rope, in particular in the normal style, with an inner strand layer (2), in particular stranded on a core strand (1), and a plastic padding (7) under the outer strand layer (4), characterized in that the outer wires (6) of the strands (3 ) of the inner strand layer (2) are covered with plastic (7).