Cable and preparation method thereof

Abstract

The invention discloses a cable and a preparation method thereof. The cable comprises at least two conductors twisted together, wherein the conductors are twisted to form a twisted body, and the outside of the twisted body is coated with an insulating layer; each of the conductors is a conducting wire which is coated by the insulating layer and is twisted by at least two core wires; and the twisted direction of the conductors is the same as that of the insulating core wires twisted mutually. The method comprises the following steps: preparing pre-designed single wires for each of the conductors by the conventional method; twisting the core wires of each of the conductors respectively in the same direction, and coating the insulating layer outside the core wires; and coating a jacket for a strengthening cable or other designed cables. The cable ensures that the twisted direction of the conductors is the same as that of the insulating core wires, and can effectively solve the problems of short circuit and open circuit caused by movement, shrinkage and fatigue of the cable, and prolong the service life of the conductors. A load fatigue test shows that the cable has no change after 180,000 times.

Description

technical field [0001] The invention relates to a cable and a preparation method thereof, in particular to an elevator cable and a preparation method thereof. Background technique [0002] At present, the implementation standard of the conductor is GB / T3956-1997, named "Cable Conductor", and the conductor stranding direction is not specified in the GB / T3956-1997 standard. However, the GB / T3956-1997 standard replaced the two standards GB 3956-83 and GB3957-83, but the replaced standard GB 3957-83 Table 4 clearly stipulates the stranding direction of the conductor, so in the new standard GB / T3956 - After the implementation of 1997, the stranding direction of the conductor is still used to refer to the left-hand stranding method specified in the GB 3957-83 standard. [0003] In the cables prepared under this standard, the conductors are mainly twisted to the left, and the twisting direction of the insulated core wires during cable formation is also mainly to the right. For no...

AI Technical Summary

Problems solved by technology

[0003] In the cables prepared under this standard, the conductors are mainly twisted to the left, and the twisting direction of the insulated core wires during cable formation is also mainly to the right. For non-back-twisting equipment, due to the non-back-twisting factor during the cabling process, the twisted conductors will be back-twisted (the conductors that have been wrapped insulated are no exception), making the twisted conductors change. In the straight-pull state, in the process of use, if it is pulled, the conductor in the straight-pull state will be pulled by the shortest monofilament first. When the tension reaches a certain level, the shortest one will be broken first. Then the pulling force will focus on the second, third... until the conductors are all broken, forming an open circuit.

Images