Flexible Electric Control Cable - Nexans > 자유게시판

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To improve the working of the cable underneath the effect of wind forces, and consequently make it possible for such a cable for use as a spreader cable, the core element formed as a supporting factor comprises an assembly of braided lead cords on which a braid of tension-resistant plastic filaments is applied. The constantly altering tensile forces acting on the cable have the impact of changing the gap between the conductors of the wires 1a and 1b. If present is flowing by the conductors, i.e. they are connected to a voltage supply, the capacitance of the pair of wires 1a, 1b also changes. In strong winds, this will lead to extreme buckling of the cable, which may hinder the sequence of movements of the cable. The braided lead cords bring about an increase in the dead weight with out noticeably rising its circulate resistance within the transverse direction or reducing its flexibility.

One of many causes of those tensile forces is the lifeless weight of the cable that's wound up onto and unwound from a drum situated above the spreader. The aramid-primarily based rovings contribute each to sustaining the pliability of the cable and sustaining the required tensile energy. To solve the problems described, it is proposed in the case of a drum-windable cable with stranding parts stranded in no less than two stranding layers, by which the primary stranding layer is organized around a supporting ingredient with a steel cable, that at least one stranding layer is provided with stranding elements that comprise a braided lead cord, an extruded polyamide- or polyester-based sheathing surrounding the lead cord and aramid-primarily based rovings organized between the lead cord and the sheathing in such a method that they run in longitudinally. FIG. 1 shows a drum-windable cable which has a central component 1, around which a first layer 2 of stranding parts 2a is stranded. In the case of the cable described, the stranding elements 2a and 3a serve for controlling the arms of the spreader.

The length of lay of the individual stranding components is roughly 8 instances the stranding diameter. FIG. 2 shows a side cut-away view of parts 1a and 1b from FIG. 1, in accordance with one embodiment. The wire 1a or 1b that is represented in FIG. 2 contains a core 10 made from a tension-resistant plastic. A multiplicity of copper wires eleven are stranded onto this core 10. The copper wires have with preference a diameter of 0.2 to 0.3 mm. Each stranding element 2a and 3a has-as known per se-a not specifically designated, centrally arranged electrical conductor, for instance a high-quality-wired copper conductor, and a not specifically designated insulation, for example based on ethylene-propylene rubber. EP zero 178 249 B1 discloses a versatile electric control cable by which plenty of bundles of wires are stranded on a core aspect formed as a supporting factor, wherein each bundle of wires includes a core ingredient with wires stranded on it and through which the core formed by the supporting component and the wires is surrounded with a braiding and a plastic jacket. When the spreader is moved up and down, the cable is uncovered to tensile forces of various magnitudes.

Application areas for such cables are container loading devices (spreader cables). DE 33 36 616 discloses a drum-windable management cable, such as are used in container loading gadgets. The present invention is predicated on the article of providing a cable of the kind mentioned at the beginning with which it is feasible to permit an in-situ measurement of the tensile forces appearing on the cable and, on the premise of the measured values, control the winding velocity with which the cable is wound up onto and unwound from a drum during operation. The cable is in this case allowed to run freely by means of the air vertically over a substantial peak. Over the layer of wires 11 there's a buffer tube 12, which consists of a compressible, elastically deformable materials. With desire, the buffer tube 12 consists of an ethylene-propylene rubber. The taping 6 is sheathed by an internal jacket 7 made from an extruded rubber mixture, inside the wall of which a braid eight of polyester filaments is offered as a safety in opposition to torsion. An extruded layer 1f of plastics materials serves as the outer sheathing. The length of lay of the wires 1a, 1b and of the interstitial fillings 1c, 1d is between 20 and 40 D, the place D is the skin diameter of the stranding factor comprising the wires 1a, 1b and the interstitial fillings 1c, 1d. It is usually important that the layer if is compressible.