Types of PANTOGRAPH

Industrial Training at
Kurla Carshed
RN : 13214

Basic Knowledge of ‘EMU’
 An EMU consists of 4 or 5 units.
 A unit comprises of 3 coaches.
 So there are 12 and 15 coaches EMU
running in Mumbai.
 The vehicle is equipped with a state-
of-the-art three-phase drive with
asynchronous Motor
 Types.

There are two types of Basic
Unit:
 End Basic Unit
 Middle Basic Unit

End Basic Unit
 Motor Coach (MC)
 Driving Trailer
Coach (DTC)
 Trailer Coach
(TC)

Middle Basic Unit
 Motor Coach (MC)
 Non-Driving
Trailer Coach
(NDTC)
 Trailer Coach
(TC)

Control Technology
 There are two Central Control Units
(CCU).
 The Units are connected to each other via
an MVB Bus.
 If the MVB bus is not available despite of
this fallback, the vehicle can be operated
in degraded operation via the rescue drive
mode.
 All the switches , buttons and devices are
connected to a KLIP station

Diagnostic Display Support
 The MMI (Man-Machine Interface) is
installed in the driver's cab in the DTC.
 The states of functions are indicated to
the driver by means of coloured icons.
 Automatic vigilance device has been
implemented via the master controller.
 In rescue drive mode, the automatic
application of the brakes is immediately
initiated.

Types of Pantograph :
 Diamond Shape – For DC rakes.
 Bow Type – For AC/DC rakes.
There are two types of Bow used :
A. Schunk metal & carbon India ltd - used in
Siemens rake only.
B. Stone India ltd - used in Siemens rake &
BHEL rakes

The Pantograph has three articulations :
1.Lower Articulation 2.Middle Articulation
3.Upper Articulation
1. LOWER ARTICULATION
It contains :
 Base Frame
 Main Springs
 Lower Arm
 Yoke Assembly
 Push rod Assembly

Base Frame
Base Frame
Insulators

Lower Arm Assembly
Middle
Articulation
Assembly
Lower Arm
Pedestal
Horizontal
Spindle

MIDDLE ARTICULATION
CENTRE SWING LINK

UPPER ARTICULATION
Upper Articulation contains :
1. Bow suspension assembly
2. Transverse tube assembly
3. Upper distance piece
4. Steady tube

Upper Distance Piece and
Steady Tube Assembly
Upper Distance
Piece
Steady
Tube

YOKE
ASSEMBLY
COPPER
SHUNTS
RUBBERIZED
THRUST
BLOCK(BUFFER)
MAIN
SPRINGS
Lower Arm
PUSH ROD
SLOTTED
BAR
HORIZONTAL
SPINDLE
UPPER
FRAME
MIDDLE
ARTICULATION
ASSEMBLY

Operation
In it’s lowered position the main
Springs are extended by pulling the
lower arm rotation by servomotor
and its insulator mechanism
assembly. When its tension is
released the pantograph raises.

Raising :
When the compressed air is admitted into the air motor
cylinder
 The cylinder piston compresses the holding down spring
inside the air motor
 It displaces the slotted bar then permits the rotation of
the horizontal spindle of the lower arm under the action
of the working springs.
 Thus the pantograph raises until collector head reaches
the overhead wire.
 The pantograph balance is maintained through the
working of the main springs
slotted bar insulator
MECHANICAL ASSEMBLY
HOLDING DOWN SPRING
air motor cylinder
Piston rod

Lowering :
 Releasing the compressed air in the
cylinder causes the piston to return under
the action of the holding springs.
 The slotted link pulls the horizontal
spindle and lowers the pantograph.
 Air pressure required for complete
extension of the piston rod will be 5
kg/cm2.
 Graphite grease is applied on the pan for
smooth operation

Static Adjustment :
The static load of the pantograph is the
load applied by the pantograph on the
contact wire. The load must be as
constant as possible through out the
entire contact range 0.5 to 2.0m of the
pantograph. It is adjusted by four static
screws.
1.5m 1.0m
1.75m 0.5m

Transverse flexibility of the
pantograph :
 Raise the pantograph to a height of
1.5m
 Pull the upper articulation
transversely with a force of 50 kg
weight suspended on a rope
passing over a pulley.
 The displacement of the bow should
be 36 mm + 5mm.

Datas :
 Width of the pan : 1800/2032 + 10 mm
 Weight of the panto without insulators : 230kg
 Current collector strip material : Electrolyte copper
 Nominal Voltage : 25 KV AC/1500 V DC
 Nominal Current : 60/1100Amps
 Raising time/Lowering time : 5 Sec.
 Thickness of copper strip : 6.35mm
 No. Of strips per pan : 8 Nos.
 Condemned size normal : 3 mm
 Monsoon : 4mm
 Maximum Height on release position : 2490 m
SIL PANTOGRAPH BEARING
YOKE ASSEMBLBAY : 06 nos.
UPPER ARTICULATION : 02 nos
LOWER ARTICULATION : 02 nos
PUSHROD ASSEMBLY : 02 nos
MIDDLE ARTICULATION : 02 nos
TOTAL NO. OF BEARING : 14nos

Parts of Schunk Pantograph
 Base Frame
 Lower Frame
 Upper Frame
 Air Bellow
 Coupling Rod
 Hydraulic Damper
 Cam disks with rope wire
 Parallel guide bar
 Pneumatic control box
 Diagonal rod
 Apex tube
 Rocker box
 Bow Assembly

Base Frame
Resting buffer
Base Bearing
Spring Support

Lower Frame
Hydraulic
Damper
Cam
Cable rope

Upper Frame
Coupling Rod
Bearing Blocks

Air bellow
Cable guide
Air bellow
Bellow cover
Air inlet

Pneumatic control
filter
Pressure
regulatorSafety valve3/2 way
valve
Safety valve
2
Throttle
valve

Rocker Box
Spring support
Leaf Spring
Collector strip
support
Rocker
suspension

Datas :
 Width of the pan : 2032 + 10 mm
 Total Weight of the panto with insulators : 150kg(appx.)
 Current collector strip material : Electrolyte Cu.
 Nominal Voltage : 25 KV AC/1500 V DC
 Nominal Current : 60/1100Amps
 Raising time/Lowering time : 10 Sec.
 Thickness of copper strip : 6.35mm
 No. Of strips per pan : 07Nos.
 Condemned size normal : 3 mm
 Monsoon : 4mm
 Total length in resting position : 2370 mm. +10 mm.
 Maximum extension position : 2400 +10 mm.
 Minimum height with insulator : 575 +10 mm.
 Frame insulators : 25 KV ,4nos.
 Insulator Height : 363 mm.
 Maximum speed under healthy OHE wire : 160 KMPH
 Air pressure for continuous operation : 7 bar

Types of PANTOGRAPH

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