Nitrogen spring restored cylinder with pantograph two-stage pistons

Abstract

The invention discloses a nitrogen spring restored cylinder with pantograph two-stage pistons. The cylinder comprises a cylinder body, a front end cover, a transition end cover and a rear end cover, wherein the first-stage piston is arranged in the cylinder body, and four nitrogen springs are arranged in the cylinder body; the rear ends of the nitrogen springs are fixedly connected with the transition end cover and the rear end cover, and the front ends of the nitrogen springs are connected with the one-stage piston; the second-stage piston is arranged in the first-stage piston, a spheroidal structure is arranged at the rear end of the second-stage piston, and a conical surface washer matched with the spheroidal structure is arranged in the first-stage piston; the front end cover is provided with an air inlet, and the front end cover and the transition end cover are respectively provided with one-way throttling valves. The cylinder disclosed by the invention has the advantages that the restoration is smooth, the assembling and the disassembling are convenient and rapid, the mounting space is smaller, and the cylinder has buffering and regulating functions.

Description

technical field [0001] The invention relates to an electric locomotive technology, in particular to a pantograph secondary piston nitrogen spring return cylinder. Background technique [0002] The pantograph is installed on electric locomotives such as trunk railways, urban rails, and subways, and is used to collect current from the catenary for the use of vehicles. At present, most urban rail and subway vehicles use pneumatically driven pantographs. It is divided into cylinder spring type and air bag type. [0003] Cylinder spring type pantograph adopts a compression reset lowering bow cylinder and a set of lifting bow tension springs to control the lifting of the pantograph. When there is no compressed gas in the lowering bow cylinder, the The torque generated by compressing the lowering spring is greater than the torque generated by stretching the raising spring, and the compressed lowering spring in the bow lowering reset cylinder plays the role of lowering the bow, an...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the commonly used compression lowering bow cylinders all use cylindrical coil springs, which require a large pre-tightening force during installation, and special tooling is required for loading and unloading. There are unsafe factors, and the change of the cylinder pressure curve is complex and unstable. It is easy to cause a large impact when bowing, which will have a great impact on the service life of the pantograph

In addition, this type of traditional cylinder often adopts a live joint non-linear drive structure. When the cylinder pushes the pantograph to lower the bow, it is easy to cause bending and deformation of the drive device, and the space required is large.

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