Draw and explain construction of Faiveley type pantograph collector. Also explain its working in brief.
1 Answer
Answer :
Faiveley type pantograph collector:
Construction of Faiveley type pantograph collector :
It consists of i) sub frame or base, ii) Articulated system, iii) Pneumatic control system including throttle valve, iv) Two raising springs v) Four insulators.
The base is made up of welded sections and houses two ball bearings on which is carried the articulated system.
Rubber stops are provided to limit the folding of the articulated system at the lower part.
Articulated system consists of:
a) Horizontal spindle turning into two ball bearings which are part of the base.
b) Lower arm integral with horizontal spindle and supporting at the upper end bearing on which are fitted two tubes of the upper frame.
c) Thrust rod articulated at lower end on fixed point of the base frame and on upper end on bearing housed in the yoke casting at upper end of lower arm.
d) Transversal tube rotating in the sleeves fitted on the tube ends of upper frame.
e) Positioning rod articulated on a pin fitted on the thrust rod and on one side & on the crank pin fitted to the shank as shown in the figure.
f) Bow consists of frame on which are bolted two connecting strips.
g) Whole pantograph is fitted on the roof of the vehicle by means of four insulators.
Working of Faiveley type pantograph collector:
When compressed air is admitted in the central cylinder, piston compresses the holding down springs and slotted rod gets translatory motion which permits horizontal spindle to rotate under the action of up springs.
The pantograph then rises until collector touches the OHE.
The articulated system then stops and piston complete its stroke.
Piston remains stationary during normal operation.
The pin of horizontal spindle is permitted to move freely in the slot of slotted rod & pantograph is operated purely by the up springs.