A pre-twisted tension clamp

Abstract

The invention discloses a preformed strain clamp, which comprises a preformed armor rod (1) and a connecting device (2). The connecting device (2) comprises two hanging plates (2a and 2b) with the same structure. The two hanging plates are symmetrically placed without being in contact with each other. Two groups of coaxial holes (2c and 2d) are arranged in the two hanging plates. The connecting device (2) additionally comprises a heart-shaped ring (3). The heart-shaped ring (3) is arranged between the two hanging plates. The heart-shaped ring (3) and the coaxial holes (2c) are coaxial. The two hanging plates and the heart-shaped ring (3) are connected through a bolt (4). A bolt (5) is arranged in coaxial holes (2d). The top end of the preformed armor rod is folded by half and is nested on the heart-shaped ring (3). The other part of the preformed armor rod is spirally tubular. The preformed strain clamp has the advantages that the structure is simple and reasonable, the preformed strain clamp is convenient to install, the stress between the clamp and the wire is evenly distributed, no stress concentration point exists and the practicability is higher.

Description

technical field [0001] The invention belongs to the field of components used in overhead power transmission lines, in particular to a pre-twisted tension clamp. Background technique [0002] With the rapid increase of people's demand for power, however, the overhead insulated conductors need to be connected by tension clamps at the corners and ends, which requires a large number of tension clamps. Traditional strain clamps adopt wedge structure and bolt structure. The wedge-shaped strain clamp uses the splitting force of the wedge to lock the steel strands in the clamp. Since the locked steel strands are stressed unevenly, such wire clamps are easy to damage the steel strands, resulting in a low service life. The bolt-type tension clamp uses the friction force generated by the vertical pressure of the U-shaped screw and the wavy groove of the clamp to fix the wire, but the obtained friction force is small, and the local stress of the bolt locking part is more concentrated....

AI Technical Summary

Problems solved by technology

Due to the uneven stress on the locked steel strand, this kind of clamp is easy to damage the steel strand, resulting in a lower life span

The bolt-type tension clamp uses the friction force generated by the vertical pressure of the U-shaped screw and the wavy groove of the clamp to fix the wire, but the obtained friction force is small, and the local stress of the bolt locking part is more concentrated. , the wires are easy to loosen, and the safety is low

Moreover, the structures of these two types of tension clamps are relatively complicated.

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