Gas pipeline installed on pantograph and manufacturing method thereof

Abstract

The invention relates to a gas pipeline installed on a pantograph and a manufacturing method thereof. The gas pipeline comprises a pipe fitting and a pipe joint, wherein the pipe fitting is made of a polytetrafluoroethylene material; the pipe joint is arranged at an end of the pipe fitting and composed of a pipe hoop and a hollow core part, the pipe hoop is provided with an internal thread, and the outside surface of the hollow core part is provided with a ladder-shaped step; and the pipe hoop and the hollow core part are compressed tightly by using an extrusion device so as to form an insulating gas pipeline. When the pipe hoop and the pipe fitting in the gas pipeline provided by the invention are compressed tightly, the air between the two components overflows completely, and the two components are combined compactly and can not be separated due to vibration of the gas pipeline.

Description

technical field [0001] The invention relates to an air delivery pipe installed on a pantograph and a method for making the air delivery pipe. Background technique [0002] When the electric locomotive is raising the pantograph, compressed air needs to be input into the transmission cylinder, so that the piston in the transmission cylinder compresses the lowering spring in the cylinder, and the lowering spring will drive the lower arm to rotate after being compressed, so that the The pantograph rises; while the pantograph lowers, the compressed air in the transmission cylinder is discharged out of the transmission cylinder through the pantograph buffer valve, so that the pantograph descends. An air pipe is installed between the compressed air and the transmission cylinder. [0003] As far as the gas pipeline on the pantograph is concerned, since the pantograph is a component that is in contact with high voltage electricity, the gas pipeline must have insulation properties; ...

AI Technical Summary

Problems solved by technology

Although the gas pipeline with this structure can transport gas or liquid with a certain pressure, the rubber material is easy to deteriorate in the environment of minus 40°C to minus 70°C, and because the steel wire is wound inside, and the steel wire and metal material constitute There can only be a very thin rubber layer between the pipe joints, so the insulation effect of this kind of air pipe will not be very ideal; at the same time, because the annular grooves set on the inner surface of the pipe collar are independent of each other, if the pipe fittings use rigid poly Fluorine material, when it is crimped with the pipe fittings, the air retained in the annular groove cannot be completely discharged. At this time, an air compression force will be generated in the annular groove, causing the pipe ferrule to generate expansion force outward. This situation will make the buckle The tightening force is reduced by 20%-30%, which makes it easy for the pipe clamp to separate from the pipe fittings when the air pipe trembles violently, so that the air pipe cannot transmit gas; The hollow core is a part used to clamp the pipe fittings. The axial lengths of the two should be kept equal. However, since the oxygen pipe on the pantograph needs to withstand a large torsional force, if the axial lengths of the pipe collar and the hollow core are equal , under the action of torsional force, the pipe will be broken from the root of the pipe collar and the hollow core, so that the service life of the oxygen pipe with this structure is greatly shortened

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