Method for manufacturing small-pitch aluminum stranded wire

Abstract

The invention discloses a method for manufacturing a small-pitch aluminum stranded wire. A lay plate with a proper size and a distance between the wire distributing plate and an inlet of a closing die are selected on a fork wire-stranding machine set; an angle between an aluminum wire which is led out of a wire hole on the external periphery of the lay plate and then enters the inlet of the closing die and a core wire which is led out of an axle tube and then enters the inlet of the closing die is between 45 and 63 degrees when the aluminum stranded wire on the outermost layer is stranded and is between 35 and 50 degrees when the aluminum stranded wires on the other layers are stranded; and the obtained lay ratio value of the outermost layer is between 3.5 and 4.5 and the lay ratio value of the other layers is between 6.5 and 8.5. The aluminum wire which is subjected to heat treatment is taken as a raw material; the ratio of a pitch of the cylindrical helix-shaped aluminum wire in each layer of the aluminum stranded wire to the diameter of a cylindrical surface on which the cylindrical helix-shaped aluminum wire on the layer is arranged is relatively small; the aluminum stranded wire is easily bent; the allowable bending radius is relatively small; and after being bent into small bends, the aluminum stranded wire does not bridle wire, deform or get out of a sleeve, and has a smooth, round and flat surface and a stable structure and is suitable for serving as the aluminum stranded wire for connecting electric contacts of power distribution equipment in a high-voltage substation and a high-voltage converter station.

Description

technical field [0001] The invention relates to a method for manufacturing aluminum strands with a fork-type stranding machine, in particular to a doubling angle in the method for manufacturing aluminum strands with a fork-type stranding machine. Background technique [0002] Aluminum stranded wire is a cable made of multiple aluminum wires twisted on a fork-type twisting machine. A cylindrical aluminum stranded wire twisted in multiple layers. There is a core wire at the axis of the aluminum stranded wire. The core wire can be a single wire, or the core wire can be twisted by 2, 3, 4, 5 or 6 wires. The core wire can be aluminum wire or steel wire, and the core wire is layered and stranded with aluminum wires. In the aluminum stranded wire, except for a single core wire, each aluminum wire is a cylinder. Helical shape, the cylindrical helical aluminum wires of each layer of the aluminum stranded wire are on the same cylindrical surface, and the pitch of the cylindrical heli...

AI Technical Summary

Problems solved by technology

The aluminum stranded wire manufactured by the above method is relatively large in pitch diameter, the aluminum stranded wire is relatively rigid, and is not easy to bend, so it cannot be used as an aluminum stranded wire for connecting electrical contacts of high-voltage power distribution equipment in high-voltage substations and high-voltage converter stations.

[0003] The pitch ratio of the aluminum stranded wire can be adjusted in a small range by manually adjusting the transmission gear between the wire carrier and its motor and the transmission gear between the traction machine and its motor. The angle between the aluminum wire and the core wire that enters the entrance of the paralleling mold after the wire hole is drawn out is relatively small, usually 17° to 30°, and the pitch diameter ratio of the manufactured aluminum stranded wire is between 10 and 17, which cannot be manufactured Aluminum stranded wires with relatively small pitch diameters cannot meet the requirements of aluminum stranded wires used for connection between electrical contacts of high-voltage power distribution equipment in high-voltage substations and high-voltage converter stations.