Industrial Training at

Kurla Carshed

RN : 13214

INTRODUCTION

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)

Major Equipments of DTC

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.

Pantograph

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

Stone India ltd Pantograph

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

Main Springs

Lower Arm AssemblyMiddle Articulation Assembly

Lower Arm

Pedestal

Horizontal Spindle

Yoke Assembly

Yoke Assembly

Push Rod Assembly

Push Rod

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

Bow Suspension Assembly

Transverse tube Assembly

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 nosLOWER ARTICULATION : 02 nosPUSHROD ASSEMBLY : 02 nosMIDDLE ARTICULATION : 02 nos

TOTAL NO. OF BEARING : 14nos

Schunk Pantograph

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 bufferBase 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

Coupling Rod

Parallel guide bar

Hydraulic Damper

Pneumatic control

filterPressure regulatorSafety valve

13/2 way valve

Safety valve 2

Throttle valve

Diagonal Rod

Diagonal Rod

Rocker Box

Spring support

Leaf Spring

Collector strip support

Rocker suspension

Apex Tube

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