Strain clamp of composite-core all-aluminum conductor expansion terminal

Abstract

The invention, which belongs to the technical field of a power cable clamping device, in particular relates to a strain clamp of a composite-core all-aluminum conductor expansion terminal. The strain clamp comprises a spinning type steel anchor, a strain casing pipe, a tensioned clamp core, a strain clamp sleeve, a liner pipe, a wire core, and a drainage plate. Two-level threads with different external diameters are arranged at the front end of the spinning type steel anchor, wherein the external diameter of the first-level thread is larger than that of the second-level thread; and a support head is formed at the front end of the second-level thread. The strain casing pipe is a penetrating tubular pipe with same diameters; and the front end of the tubular pipe has an arc shape in a convergence manner. The external diameter of the liner pipe matches the internal diameter of the strain casing pipe. A crimping point is arranged at the arc convergence part of the front end of the strain casing pipe. Circumferential lines are arranged at the outer surface of the liner pipe. Because the circumferential lines are arranged at the outer surface of the liner pipe, the friction force between the liner pipe and the strain casing pipe is increased. After the spinning type steel anchor, the strain clamp sleeve, the tensioned clamp core, and the strain casing pipe are assembled, the crimping point is extruded to fix the liner pipe, so that the wire is fixed.

Description

technical field [0001] The invention belongs to the technical field of power cable clamping devices, and in particular relates to a strain clamp for a composite core aluminum stranded wire expansion force terminal. 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 safe. Therefore, the current connecting wire clips used on domestic transmission lines have defects such as inconveni...

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 invention patent with the patent number of 2007200347845 overcomes some of the above problems technically, especially for the clamping of the wire core. This technology adopts the spinning clamping method to enhance the grip force of the tension sandwich core on the wire core, and the installation is very convenient. , can be reused, 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 and the tension sandwich The position (or distance) is relatively stable, but because the outer wall of the lining pipe and the inner wall of the tension casing are smooth, the friction coefficient between the lining pipe and the tension casing is low. Under the action of its own tension, shrinkage force (influenced by ambient temperature) or wind force, it is easy to cause the grip force of the tension sleeve to the inner liner to decrease, causing the device to lose its proper function, and even because of the tension between the inner liner and the tension sleeve. The contact surface 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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