Continuous high-strength fiber resin-based compound core for overhead conductor and preparation method thereof

Abstract

The invention relates to an improved high-strength fiber resin-based compound core for an overhead conductor. The improved high-strength fiber resin-based compound core is characterized by being formed by twisting a plurality of single compound cores, wherein each single compound core is at least formed by concentrically compounding an inner layer fiber resin core and an outer layer fiber resin core; curing resin for outer layer fibers at least except a core layer is flexible resin the vitrified temperature of which is more than or equal to 180 DEG C; and the thickness of the outer layer is between 0.5 millimeter and 3 millimeters. By adopting the preparation method, the overall bending property of an obtained twisted compound core is remarkably improved, and the minimum bending radius is40 times of the diameter or smaller after twisting; the twisted compound core can bear radial compressive stress, has a high injury tolerance ratio and good using safety, can be directly connected byadopting ordinary hardware fitting and construction hardware fitting for a conductor in a compression joint way without cracking; the using and erecting costs and the construction cost are greatly lowered; and popularization and application are promoted. A single compound core is molded in a semi-curing mode, so that pulling and extruding speeds can be greatly increased and the production speed of the entire compound core can be increased by 20-50 percent compared with that of the conventional compound core adopting cured resin.

Description

technical field [0001] The invention is an improvement to the continuous high-strength fiber resin-based composite core of a load-bearing element for overhead wires and a preparation method thereof, in particular to a composite core for overhead wires with good bendability and capable of bearing radial grip pressure and a preparation method thereof. Background technique [0002] The continuous high-strength fiber resin-based composite core has light weight, strong tensile strength, small expansion coefficient, can withstand high temperature (such as above 180°C) operation, and has small sag. It replaces galvanized steel wire as the load-bearing element of overhead wires to achieve overhead The large draw-to-weight ratio, low sag, low sag, low creep, low line loss, and high temperature resistance of the wire have been favored by domestic and foreign electric power industries. [0003] The prior art prepares overhead wire load-bearing components——continuous high-strength fiber...

AI Technical Summary

Problems solved by technology

High-temperature resistant thermosetting resin, after curing, it is in a brittle and hard state similar to ceramics. The continuous high-strength fiber composite core obtained by curing all of this kind of thermosetting hard resin has some inevitable inherent shortcomings in actual use: First, the core after curing The high hardness of the composite core leads to a large bending radius of the composite core, and the minimum bending radius is about 50 times the diameter, which brings inconvenience to production and laying-out construction; second, the cured resin is brittle and hard, with poor fracture toughness and impact resistance, and damage tolerance Relatively low, the force is easy to crack in the longitudinal direction (longitudinal cracking will lead to a significant decline in the performance of the composite core, and lose the meaning of the composite core), which is likely to cause safety hazards, especially the radial mechanical properties are extremely poor, and it cannot withstand the radial grip pressure, resulting in In the process, it is not possible to use the usual steel core conductors that mainly use crimping connection fittings, and special fittings that mainly rely on the friction between the composite core and the fittings are required to be equipped with load-bearing tension.

However, since the hardening and brittle defects of thermosetting resins have not been improved, the above-mentioned shortcomings still exist.

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