Expansion joint of contact rail

Abstract

The invention discloses an expansion joint of a contact rail, and belongs to the technical field of urban railway transit overhead contact system power supply. The expansion joint comprises an upper telescopic rail, an upper electrical connection plate, a middle rail, a gear, a lower electrical connection plate, a lower telescopic rail and a dividing rule, wherein two ends of the middle rail are manufactured into step shapes, are in lap joint and closely matched with step ends of the upper telescopic rail and the lower telescopic rail, a current receiving surface of the whole expansion joint of the contact rail has no continuous disconnected notches; the gear is meshed with racks of the upper electrical connection plate and the lower electrical connection plate and arranged in a manner that the upper electrical connection plate and the lower electrical connection plate are symmetric with the gear serving as the center; and the '0'scale of the dividing rule is aligned to the outside of one end of the middle rail, so that the problems that the current receiving surface of the expansion joint of the contact rail is discontinuous, the middle rail deviates towards one side, expansion clearances are not uniform, the joint is difficult to mount and adjust, and repeated measurement is required are solved.

Description

Technical field [0001] The invention involves the field of power supply technology in urban rail transit networks, and it is specific to a connection of contact -oriented expansion. Background technique [0002] At present, with the rapid development of my country's urban rail transit, urban rail trains mostly use contact rail power supply, that is, use the train collecting boots to contact the flowing surface with the discharge of charged contact. It is becoming more and more widely used in urban orbit.However, every 60-90 meters need to set up a contact-oriented expansion joint to adjust the length of thermal expansion and contraction due to temperature changes.The flowing surface of the expansion connector is mostly foreign technology. The forms of the formation are mostly used. The forms of the form are mostly three -stage.The mouth is suitable for both ends of the middle track, and the three segments are linked to telescopic by sliding.Its defect is; 1. Disposal between each...

AI Technical Summary

Problems solved by technology

Its defect is: 1. The three-section type is disconnected between every two sections, and there are two discontinuous gaps, so that the flow receiving surface of the contact rail expansion joint is discontinuous. When the collector shoe of the train slides over the expansion joint gap, there is 2. During the use of the three-stage type, the middle rail is often biased to one side, making the two gaps uneven in size, and one of the disconnected gaps is too large, which exceeds the design requirements and aggravates the current collection of the train. The wear of the boots will cause the train to cut off the power instantaneously when it is serious, and it is easy to generate arcs, which reduces the service life of some equipment; 3. During installation, it is necessary to repeatedly measure the gap size of the expansion joint of the contact rail, the positioning is inaccurate, the installation and adjustment are difficult, and the installation accuracy is not high.

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