Mandrel type expansion joint for aluminum-steel composite rails

Abstract

The invention relates to a mandrel type expansion joint for aluminum-steel composite rails, belonging to apparatuses for power supply in rail transit. The mandrel type expansion joint is mainly characterized in that a mandrel 2, a bellows 4, a fishplate 7, left and right copper seats, bushes and the like are adopted to form three different routes to transmit the current from an aluminum-steel composite rail 1 at the right side to an aluminum-steel composite rail 6 at the left side. The bellows 4 is sleeved on the mandrel 2, so the bending of the multi-nodal bellows is limited. In this way, the expansion joint is applicable both for lateral contact current connecting mode and for vertical contact current connecting mode; no sparks appear when a current collector passes through; the mandrel type expansion joint is high in reliability and small in craft difficulty; aluminum-steel composite rails with length reaching 100 meters on the circuit expand with heat and contract with cold freely without bending; and the temperature rises little when big current passes through the expansion joint continuously for a long time.

Description

technical field [0001] The invention relates to a mandrel-type expansion joint of a steel-aluminum composite rail, which belongs to equipment for power supply of rail transit. Background technique [0002] Before the present invention was made, the third rail power supply system of rail transit used steel-aluminum composite rail in the prior art, and a current connector was installed in the expansion joint to compensate for the electrical conduction when the relative sliding contact between the fishplate and the steel-aluminum composite rail Insufficient quantity. The existing expansion joints have at most two transmission paths. For example, patent No. ZL200820006292.X AC power supply rail device, patent No. 200920178441.5 steel-aluminum composite rail bellows expansion joint and patent No. 201020561737.8 steel-aluminum composite rail corrugated expansion joint have different forms of current connectors. The expansion joint in the ZL200820006292.X AC power supply rail dev...

AI Technical Summary

Problems solved by technology

The expansion joint in the ZL200820006292.X AC power supply rail device only relies on sliding contact to make the current pass through the expansion joint. After a long time, the contact surface will be eroded and the reliability will be reduced.

200920178441.5 Bellows expansion joint of steel-aluminum composite rail, the manufacturing process of the copper multi-layer and multi-wave bellows is difficult and the yield is low

201020561737.8 The multi-layer corrugated copper sheet in the corrugated expansion joint of the steel-aluminum composite rail has poor shape stability in space, and is only suitable for down-contact power transmission. It is inconvenient to use in the side-contact power transmission method due to the large deflection of the copper sheet

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