Cross arm

Abstract

The invention provides a cross arm and belongs to the mechanical technical field. The cross arm solves the problem that the bend resistance ability of an existing composite cross arm is low. The cross arm comprises a cross arm body, wherein the cross arm body is in a rectangular tubular shape; two opposite-through holes distributed in the axial direction of the cross arm body are formed in the side wall of the cross arm body; elongated dovetail grooves are formed in the two opposite inner side walls of the cross arm body; each dovetail groove is arranged in the axial direction of the cross arm body; the two ends of each dovetail groove are located on the two end faces of the cross arm body correspondingly; the two opposite-through holes are circular and are right opposite groove openings of the dovetail grooves; iron blocks matched with the dovetail grooves in size and shape are embedded in the dovetail grooves; the two end faces of the iron blocks are even with the two end faces of the cross arm body; circular through holes penetrate through each iron block; the two through holes are formed in each iron block and the positions of the through holes are right opposite the two opposite-through holes; and the bore diameters of the through holes are greater than or equal to the bore diameters of the opposite-through holes. The cross arm has the advantage of being high in bend resistance property.

Description

Technical field [0001] The invention belongs to the technical field of machinery, and relates to a cross arm, especially a cross arm made of composite materials. Background technique [0002] The cross arm is an important part of the tower. Its function is to install insulators and fittings to support the wires and lightning protection wires and keep them at a certain safe distance according to regulations. At present, iron cross arms and porcelain cross arms are widely used. Crossarms, composite crossarms, etc., where composite crossarms have the advantages of good antifouling performance, environmental corrosion resistance, light weight, easy installation and maintenance, but composite crossarms are mostly pipes formed by traditional pultrusion processes. The structure is hollow and thin-walled. The composite cross arm needs to be used with U-shaped hoop. During installation, the U-shaped hoop is sleeved on the pole tower, and the two ends of the U-shaped hoop pass through the ...

AI Technical Summary

Problems solved by technology

However, there is a shortcoming in the existing composite material cross arm: it is generally difficult to control the tightening force of the nut. If the nut is tightened too tightly, stress concentration will occur, and the hollow thin-walled composite material cross arm will cause the part to bend, deform, or even be damaged, which will affect the transmission line. safe operation

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