Expansive force terminal strain clamp of composite core aluminum-stranded conductor

Abstract

The invention relates to an expansive force terminal strain clamp of a composite core aluminum-stranded conductor. The strain clamp is composed of a spinning type steel anchor, a strain casing tube, a tension clamp core, a strain clamp sleeve, an inner liner tube, a lead core, a drainage board, a silica gel pad, a compressing point, and an exploding pressing point. The tension clamp core is sleeved in the strain clamp sleeve and is arranged at the middle section of the strain casing tube. The front end of the spinning type steel anchor is contacted with the strain clamp sleeve and is fixed with the strain casing tube by a threaded connecting way; and the silica gel pad is arranged at the joint position for sealing. The front end of the strain clamp sleeve is arranged at the exploding pressing point; the inner liner tube is arranged in the front end of the strain casing tube and is compressed and fixed by the compressing point. The advantages of the strain clamp are as follows: the streamline design of the drainage board enables a discharging phenomenon to be alleviated and thus the energy consumption is reduced; a peripheral line is arranged at the outer surface of the inner liner tube and thus the friction force between the inner liner tube and the strain casing tube is increased, thereby improving the stability; and because of arrangement of the compressing point, the tension clamp core can generate a stable radial pressure and generate great gripping power. Moreover, the provided strain clamp has the characteristics of simple structure, convenient installation, and obvious effect.

Description

technical field [0001] The invention relates to a fixing, clamping and connecting device for aluminum stranded wires of composite core power cables in high-voltage overhead transmission lines. Specifically, it discloses a novel tension-resistant clamp for expansion force terminals of aluminum stranded wires with composite cores. Background technique [0002] At present, there are mainly three kinds of devices for fixing and clamping the steel-reinforced aluminum stranded wire in domestic transmission line connection clamps. One is wire plugging, the contact surface is small and the plugging is not strong, and the wires are prone to heat; the other is aluminum tube hydraulic pressure. When installing, the wires at both ends are inserted into the aluminum tube, and then pressurized with a hydraulic tool, but the contact surface is small and the grip is not strong; The impact force changes the metallographic phase, the mechanical strength is reduced, and the explosion is not sa...

AI Technical Summary

Problems solved by technology

[0002] At present, there are mainly three kinds of devices for fixing and clamping the steel-reinforced aluminum stranded wire in domestic transmission line connection clamps. One is wire plugging, the contact surface is small and the plugging is not strong, and the wires are prone to heat; the other is aluminum tube hydraulic pressure. When installing, the wires at both ends are inserted into the aluminum tube, and then pressurized with a hydraulic tool, but the contact surface is small and the grip is not strong; The impact force changes the metallographic phase, the mechanical strength is reduced, and the explosion is not safe

Therefore, the current connecting wire clips used on domestic transmission lines have defects such as inconvenient installation, small contact surface, easy heating of wires, insufficient grip strength, and reduced mechanical strength, and cannot be used for fixing and clamping connections of new material composite core aluminum stranded wires.

The utility model patent with the patent number of 2007200347845 overcomes some of the above-mentioned problems technically, especially for the clamping of the wire core. It is convenient and can be used repeatedly, but there are still some shortcomings. For example, after the inner liner is installed and extruded, it can tightly fix the outer layer of the composite core aluminum stranded wire, so that the wire and the tension jacket, tension sandwich The position (or distance) is relatively stable, but because the outer wall of the inner liner and the inner wall of the tension casing are smooth, the friction coefficient between the inner liner and the tension casing is low, and in a long period of time, Under the action of the wire's own tension, shrinkage force (influenced by ambient temperature) or wind force, it is easy to cause the tension sleeve to reduce the grip force of the inner liner, causing the device to lose its proper function, and even due to the tension between the inner liner and the tension sleeve. The contact surface of the device is large and small, and the whole device has too many edges and corners, which is easy to generate discharge phenomenon, cause fire, bring great losses to power supply facilities, and affect normal production and life.

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