Steel-aluminum composite rail expansion joint with conductive rolling shafts

Abstract

The invention relates to a steel-aluminum composite rail expansion joint with conductive rolling shafts and belongs to a device for third-rail power supply of urban rail transportation. According to the steel-aluminum composite rail expansion joint, four conductive rolling shafts (3) are arranged at each end of two inclined planes of an adopted splice bar, and the sliding friction between the inclined plane of a waist of a steel-aluminum composite rail (1) and the splice bars (2) and (5) becomes rolling friction and one of three parallel power transmission paths is formed; the other two power transmission paths are formed by a large copper ring (8) and small copper rings (9). The steel-aluminum composite rail expansion joint has the advantages of small and stable sliding starting force, large transmission current, high reliability, small transition resistance and energy saving.

Description

technical field [0001] The utility model relates to an expansion joint of a steel-aluminum composite rail with a conductive roller, which belongs to equipment used for power supply of the third rail of urban rail transit. Background technique [0002] Before the present invention was made, in the prior art, expansion joints were required for the power supply of the third rail of urban rail transit to accommodate the length change caused by the thermal expansion and contraction of the steel-aluminum composite rail. For example, in the mandrel-type expansion joint of the steel-aluminum composite rail with patent number 2011 2023 5658.2, the contact surface between the two slopes of the fish plate and the waist of the I-shaped aluminum rail is sliding friction, and the friction coefficient is greater than 0.2. During transportation, the end has slight scratches on the inclined surface of the waist of the aluminum rail. During use, it will expand and contract with heat, and the ...

AI Technical Summary

Problems solved by technology

For example, in the mandrel-type expansion joint of the steel-aluminum composite rail with patent number 2011 2023 5658.2, the contact surface between the two slopes of the fish plate and the waist of the I-shaped aluminum rail is sliding friction, and the friction coefficient is greater than 0.2. During transportation, the end has slight scratches on the inclined surface of the waist of the aluminum rail. During use, it will expand and contract with heat, and the fishplate will evolve into fluff on the surface of the aluminum during the reciprocating movement of the fishplate relative to the aluminum rail, and the friction coefficient will increase to 0.35 or more, the sliding starting force of the expansion joint is increased from 2000N, and the tightening force of the M12 bolts also directly affects the sliding starting force, and the sliding starting force with a torque greater than 15N*M is greater than 2000N, which in turn causes the lateral load of the insulating bracket. If the force is too large and damaged, it will damage the power supply of the system and cause an accident

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