Pantograph

Abstract

The invention provides a pantograph which comprises a damper, a bottom frame, a pantograph lifting device and the like. The damper comprises an oil storage cylinder, an oil cylinder, a guide, a pistonrod, a piston, hydraulic oil and a bottom valve seat, a plurality of throttling holes are formed in the piston rod, one end of each throttling hole is connected with an oil through hole, the other end of each throttling hole is an opening facing outside the piston rod, openings of the throttling holes can be exposed in an I cavity and / or covered by the guide, at least two throttling holes are distributed at different axial positions of the piston rod, and spacers are arranged between an inner axial end of the oil cylinder and the bottom valve seat and used for adjusting stretching maximum damping force in the outward stretching stroke of the piston rod. The pantograph cancels the mode that the stretching maximum damping force is adjusted by a nut, a spring and a valve plate in the prior art, and the stretching maximum damping force is adjusted by additionally mounting the spacers with different depths. The pantograph can effectively meet requirements of use conditions of the pantograph and is simple, easy and convenient to maintain.

Description

technical field [0001] The invention relates to a pantograph, in particular to a pantograph applied to rail transit vehicles such as electric locomotives, urban rail vehicles, and EMUs. Background technique [0002] The pantograph is a key component of rail transit vehicles such as electric locomotives, urban rail vehicles, and EMUs. It is installed on the roof of rail transit vehicles. Teleported to the car for locomotive use. A pantograph usually includes: chassis, damper, bow lifting device, lower arm, bow assembly, lower guide rod, upper arm, upper guide rod, bow head, slide plate and bow air source control valve plate and other mechanisms, while the damper Installed between the base frame and the lower arm. The fluency of the pantograph collecting current from the catenary is related to the contact pressure, transition resistance, and contact area between the slide plate and the catenary, and depends on the interaction between the pantograph and the catenary; and the ...

AI Technical Summary

Problems solved by technology

Although the patent provides a scheme for adjusting the maximum damping force of the damper, in this scheme, spring valve discs are arranged on the end surface of the piston close to the chamber I of the cylinder and the end surface of the piston close to the chamber II. Specifically, the maximum tensile damping force is fine-tuned through nuts, springs and valve plates. Such a structure is very easy to loosen, so it is not reliable to use this structure to adjust the maximum tensile damping force of the damper.

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