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DELHI METRO RAIL CORPORATION LTD.
SUBMITTED BY-
JYOTI
01213503610
MECHANICAL & AUTOMATION
ENGINEERING
INDIRA GANDHI INSTITUTE OF
TECHNOLOGY
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ACKNOWLEDGEMENT
It is indeed a great pleasure for me to present this Summer Training Report on
Delhi Metro Rail Corporation as a part of the curriculum of the B.Tech.
course Mechanical & Automation Engineering
I take this golden opportunity to thank all my mentors at DMRC who with their
support
and venerated guidance made this training a real success . I express my sincere
thanks
to officers of DMRC who inspite of their busy schedule have lent their precioustime for helping me out to understand various system used in DMRC.
I will be failing in my duty if I am not mentioning the technical demonstrations
as given by the reverent staff of DMRC. There is no denying the fact that
DMRC is the epitome of modern technology and getting training at such an
organization is an exquisite learning experience that made a mark at the
profoundest part of my mind.
COMPANY PROFILE
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IntroductionMETRO is like a dream come true for Delhi, a revolutionary
change in the city transport. Delhi needs metro system in the
first place and it would change things for the better not only
for people who would be using it and but for the people living
in Delhi by reducing congestion, air pollution, noise pollution
and accidents.
The Delhi Metro is a rapid transit system serving Delhi, Gurgaon,Noida andGhaziabad in theNational Capital Region ofIndia. The network consists of six
lines with a total length of 189.63 kilometers (117.83 mi) with 142 stations of
which 35 are underground. It has a combination of elevated, at-grade and
underground lines and uses bothbroad gauge and standard gauge rolling stock.
Four types of rolling stock are used: Mitsubishi-ROTEM Broad gauge,
BombardierMOVIA, Mitsubishi-ROTEM Standard gauge and CAF Beasain
Standard gauge.
Delhi Metro is being built and operated by the Delhi Metro Rail Corporation
Limited (DMRC). As of November 2010, DMRC operates around 2,700 trips
daily between 6:00 and 23:00 running with an interval of 2 minutes 30 seconds
between trains at peak frequency.[6][7] The trains are mainly of four coaches, but
due to increase in passengers numbers, six-coach trains are also added on the
Red Line (Dilshad Garden to Rithala), Yellow Line (Jahangirpuri to HUDA city
centre), Blue Line (Dwarka sec 21 to Vaishali/NOIDA city centre) and Violet
Line (Central Secretariat to Badarpur).[4][5][7][8] The power output is supplied by
25-kilovolt, 50 Hertzalternating current through overhead catenaries. The
metro has an average daily ridership of 1.8 million commuters, and, as of July
2011, had carried over 1.25 billion commuters since its inception.[9] The Delhi
Metro Rail Corporation has been certified by the United Nations as the first
metro rail and rail-based system in the world to get carbon credits for reducing
http://en.wikipedia.org/wiki/Rapid_transithttp://en.wikipedia.org/wiki/Delhihttp://en.wikipedia.org/wiki/Gurgaonhttp://en.wikipedia.org/wiki/Noidahttp://en.wikipedia.org/wiki/Ghaziabad,_Indiahttp://en.wikipedia.org/wiki/National_Capital_Region_(India)http://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/List_of_Delhi_metro_stationshttp://en.wikipedia.org/wiki/Broad_gaugehttp://en.wikipedia.org/wiki/Standard_gaugehttp://en.wikipedia.org/wiki/Mitsubishihttp://en.wikipedia.org/wiki/Bombardier_Transportationhttp://en.wikipedia.org/wiki/Mitsubishihttp://en.wikipedia.org/wiki/CAF_Beasainhttp://en.wikipedia.org/wiki/Delhi_Metro#cite_note-updates-5http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-P2Newtrains-6http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-6coach-3http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-coaches-4http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-P2Newtrains-6http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-7http://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Hertzhttp://en.wikipedia.org/wiki/Alternating_currenthttp://en.wikipedia.org/wiki/Overhead_catenaryhttp://en.wikipedia.org/wiki/Delhi_Metro#cite_note-Ridership-8http://en.wikipedia.org/wiki/United_Nationshttp://en.wikipedia.org/wiki/Rapid_transithttp://en.wikipedia.org/wiki/Delhihttp://en.wikipedia.org/wiki/Gurgaonhttp://en.wikipedia.org/wiki/Noidahttp://en.wikipedia.org/wiki/Ghaziabad,_Indiahttp://en.wikipedia.org/wiki/National_Capital_Region_(India)http://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/List_of_Delhi_metro_stationshttp://en.wikipedia.org/wiki/Broad_gaugehttp://en.wikipedia.org/wiki/Standard_gaugehttp://en.wikipedia.org/wiki/Mitsubishihttp://en.wikipedia.org/wiki/Bombardier_Transportationhttp://en.wikipedia.org/wiki/Mitsubishihttp://en.wikipedia.org/wiki/CAF_Beasainhttp://en.wikipedia.org/wiki/Delhi_Metro#cite_note-updates-5http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-P2Newtrains-6http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-6coach-3http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-coaches-4http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-P2Newtrains-6http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-7http://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Hertzhttp://en.wikipedia.org/wiki/Alternating_currenthttp://en.wikipedia.org/wiki/Overhead_catenaryhttp://en.wikipedia.org/wiki/Delhi_Metro#cite_note-Ridership-8http://en.wikipedia.org/wiki/United_Nations7/27/2019 DMRC PROJECT (MECH).doc
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greenhouse gas emissions and helping in reducing pollution levels in the city
by 630,000 tons every year.[10]
Planning for the metro started in 1984, when the Delhi Development Authority
and the Urban Arts Commission came up with a proposal for developing amulti-modal transport system for the city. The Government of India and the
Government of Delhi jointly set up the Delhi Metro Rail Corporation (DMRC)
in 1995. Construction started in 1998, and the first section, on the Red Line,
opened in 2002, followed by the Yellow Line in 2004, the Blue Line in 2005,
its branch line in 2009, the Green and Violet Lines in 2010 and the Delhi
Airport Metro Express in 2011.
CORPORATE OBJECTIVESVISION
A world-class innovative, competitive and profitable engineering
enterprise providing total business solutions.
MISSION
To cover the whole of Delhi with a Metro Network by the year 2021.
Delhi Metro to be of world class standards in regard to safety, reliability,
punctuality, comfort and customer satisfaction.
Metro to operate on sound commercial lines obviating the need for
Government support.
CULTURAL VALUES We should be totally dedicated and committed to the Mission.
Personal integrity should never be in doubt, we should maintain full
transparency in all our decisions and transactions.
The Organization must be lean but effective. The Corporation must project an image of efficiency, transparency,
courtesy and we mean business attitude.
Construction activities should not inconvenience or endanger public life
nor should lead to ecological or environmental degradation.
All the structures should be aesthetically planned and well maintained.
http://en.wikipedia.org/wiki/Delhi_Metro#cite_note-9http://en.wikipedia.org/wiki/Delhi_Development_Authorityhttp://en.wikipedia.org/wiki/Government_of_Indiahttp://en.wikipedia.org/wiki/Government_of_Delhihttp://en.wikipedia.org/wiki/Red_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Yellow_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Blue_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Green_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Violet_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Delhi_Airport_Metro_Expresshttp://en.wikipedia.org/wiki/Delhi_Airport_Metro_Expresshttp://en.wikipedia.org/wiki/Delhi_Metro#cite_note-9http://en.wikipedia.org/wiki/Delhi_Development_Authorityhttp://en.wikipedia.org/wiki/Government_of_Indiahttp://en.wikipedia.org/wiki/Government_of_Delhihttp://en.wikipedia.org/wiki/Red_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Yellow_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Blue_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Green_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Violet_Line_(Delhi_Metro)http://en.wikipedia.org/wiki/Delhi_Airport_Metro_Expresshttp://en.wikipedia.org/wiki/Delhi_Airport_Metro_Express7/27/2019 DMRC PROJECT (MECH).doc
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ROLLING STOCK
Train Formation
At present each train set consist of four cars. Both ends of the train-set are
Driving Trailer (DT) cars and middle cars are Motor (M) cars.The train set can be controlled as a complete unit or as separate units for various
maintenance activities at the depot.
1) 4 car - DT-M-M-DT
The formation of the 4 car train is DTMM DT
Each DTM car pair is connected together by a semi-permanent coupler .thismeans that for service operation the train consist is fixed and cannot be
separated. However, for maintenance purposes, maintenance staff can
physically disengage the semi-permanent couplers so that maintenance
activities can be conducted on individual cars. Between each car pair, an
automatic coupler is used. This allows quick and easy coupling and decoupling
of the paired cars.
2) 6 car - DT-M-M-T-M-DT
3) 8 car - DT-M-M-T-M-T-M-DT (Here T car is the non-driving trailer
car.)
Here T car is the non-driving trailer car.
Salient Features
Broad Gauge
25 KV Supply Voltage System
DT - M - M - DT
DT - M - T - M - M - DT
DT - M - T - M - T - M - M - DT
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Three phase A.C. Induction Motor
Fail Safe braking with regenerative braking
VVVF Control
Reinforced conical rubber primary Suspension
Secondary Air Suspension Uniform Floor Height
Jerk Controlled Braking
Light Weight Stainless Steel Structure
Slip/Slide protection
Train Integrated Management System
PLC based saloon Air conditioning system
Electrically Operated and electronically controlled Saloon Door
Emergency Door ATP/ATO
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Function of air conditioning system
to control temperature to control humidity
to supply pure air
Design Conditions
Description Condition
No. of passengers :- 392
Ambient temperature:- 430 DBT& 33% RH /
390 DBT & 41%RH DBT
Inside condition:- 330 DBT&/290DBTPresent inside condition:- 240 DBT
Fresh air per passenger :- 2.3 lps
Cooling capacity:- 41 kw per unit
82 kw per car
Operating modes
COOL2
COOL2
TEMPERATURE
FALLING
TEMPERATURE
RISING
COOL1
COOL1
VENT
VENT
SET POINT
SET POINT +1CO
SET POINT
Set Point + 0.5Co
Set Point + 0.5C
Set Point + 1.0C
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Normal Operating Mode
In Normal Operating Mode A/C unit provides cooling and ventilation,
switching automatically by various sub modes to fulfil specified condition.
Emergency Operating Mode
When 3 Phase. Power supply is not available , ac will work in this mode & will
supply fresh air only.
Smoke Mode
In this mode , system shuts off the fresh air intake and provides full
recirculation of return air within the saloon.
Normal operating sub -modes
Vent mode :-
air is supplied inside saloon without any cooling
Cool-1 mode:-
air is supplied with cooling (only 50% of cooling capacity
is used)
Cool-2 mode:-
air is supplied with cooling (100% cooling capacity is used.
Main component of air conditioning system -
Refrigeration Equipment
Air Transfer Equipment
Electrical Equipment
A) Refrigeration equipment
1.Compressor
2. Condenser coil3. Solenoid valve
4. Thermal exp. Valve
5. Evaporator coil
1. Compressor
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The function of the compressor is to pump the refrigerant through the system
and to compress the low pressure, low temperature refrigerant into a high
pressure high temperature super heated vapour, to allow condensing to occur.
Type:- Semi-Hermetic Four Cylinder
Reciprocating Suction Gas Cooled
Speed:- 1450 rpm
Swept volume:- 82.21 m3/h
Displacement:-945ccm
2. Condenser
The function of the condenser coil is to reject the heat from refrigerant absorbed
by the evaporator coil and during the compression process
Type: Copper finned, copper tube,
brass frame heat exchanger
Quantity: 2 per unit
Air Flow:2700 l/s (each coil)
3. T-X valve
The TX valve regulates the refrigerant flow into the evaporator coil, expanding
the liquid from high pressure to low pressure, and causing a large drop in
refrigerant temperature.
Refrigerant R22
Range N -40 +10 o C
Factory Superheat 5 K
Max bulb temp. 100 o C
Max working pressure 28 bar
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4.Evaporator coil
The prime function of the evaporator compartment is to deliver conditioned air
to the main supply air duct that services the vehicle
Type: Copper finned, copper tube, brass frame heat
exchanger.
Quantity: 1 per unit.
Air Flow: 1350 l/s
Face Velocity: 2.5 m/s
Cooling Capacity: 41 kW
5. Dual pressure controller (DPC)
Its function is to switch off the refrigeration system in case of adverse system
condition . It monitors both the high and low refrigerant pressures. If the low
(LP) or high (HP) pressures reach a predetermined set point, the refrigeration
system will be shut down.
Range: LP 50 700 kPa
HP 300 3000 kPa
Set points:-
hp fault:- 2800 / 2500 kpaLp fault :- 50/350 kpa
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B. Air Transfer Scheme
1.Supply fan
As the name applies , it supplies the conditioned air inside saloon . It draws
back 70% of return air & 30% of fresh air & moves past t
Type: Two double inlet centrifugal blower
wheels with double shafted motor
Quantity: Two (2) per unit
Supply Air: 1350 Litres/second at 470 Pa
external static pressure
Motor:- 2.2 kw @1500rpm , 415 v
2.Condenser fan
Its function is draw the atmospheric air through condenser coil , inside which
hot refrigerant is flowing , thus making the heat rejection & condensing the
saloon
EvaporatorFresh air
Fresh air damper
Supply
fansaloon
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Type: Multi wing axial fan, 9 blades
Quantity: two (2) per unit
Direction of flow: Draw through
RPM Range: 0 2045 rpm
Motor:- 2.2 KW @1500rpm , 415 v
3.Air dampers
Their function is to control the fresh air & return( recirculated) air volume as
per requirement.
Mode fresh air return air
damper damper
Vent , partially fully
Cool 1 &2 opened opened
Emergency fully fully
vent opened closed
Smoke fully fully
vent closed Opened
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PNEUMATIC & BRAKE SYSTEM
Pneumatic system is mainly used in five items in metro Brake System, Coupler,
Suspension, Horn and Pantograph. But pneumatic system work in a unit with
common input and different outputs i.e. having a common air supply equipmentwhich supply air at high pressure in two pipes named MAIN PIPE (M.P.) &
BRAKE PIPE (B.P.) and other equipment tapped pressure from it. Hence it has
been configured as follows:-
Configuration
A - Air Supply equipment - DT, T
B - Brake Control equipment - DT, T, M
C - Mechanical Brake Actuating component - DT, T, M
G - Wheel Side Protection equipment - DT, T, ML - Air Suspension equipment - DT, T, M
P - Pneumatic Horn equipment - DT
U - Auxiliary Air Supply equipment - DT, T,
W - Automatic Coupler Actuating equipment - DT, T, M
A) AIR SUPPLY EQUIPMENT
Its mainly consist of three parts:-
1) Piston Compressor (VV120)
2) Air Dryer Unit (LTZ015 H)
3) Air Reservoir
Piston
compressor VV120
Air dryer unit
LTZ015-H
Air
Reserv
oir
Air
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1.Piston Compressor
There are two type of compressor:-
i. Main compressor:-
1. Discharge air pressure max. 10 bars.
2. Nominal discharge capacity 900 L/min.
3. Type piston type.
4. motor 3, 415V AC, 50 Hz,
induction motor
ii. Auxiliary air compressor
1. Nominal discharge capacity - 70 L/min
2. motor - 110V DC, 860W,10
minute rating
Features of piston compresseor:-
It is W- Shaped 3-Cylinder Unit with 2-
Stage compression reciprocating typecompressor (see fig.).
i. Extremely short design.
ii. Optimum cooling for all cylinders.
It have self-supporting, Flange- Mounted,
Motor compressor set.
i. No additional frame needed.
ii. Small installation space.
It creates very low sound pressure level.
i. Only about 64db(A)/4.6m (76db/1.0m)
It have closed circuit splash type lubrication
i. Which allow low oil consumption.
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It have forced air cool type ******** heat exchanger i.e.
radiator.
Its cooler Fan speed control by temperature.
It also has a torsion ally rigid bellow type coupling between
motor and compressor which allow no rotary vibration. It is mounted with car by wire rope isolators for no resonance
throughout the whole compressor speed range.
Compressor can be drive by AC, DC and hydraulic motor i.e.
very low specific power consumption
i. It also has low breakaway torque for low starting current
even at low temperature.
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2) Air Dryer Unit (LTZ015 H)
At very high pressure when air is cooled some component of it condense in to
liquid which make air wet. So that why an air dryer unit mounted which
perform following function on air:-
1) Dries the air.(Two column unit)
2) Separate oil & liquid from it.(Oil separator)
3) Filter the foreign partial from it.(MicroFilter)
4) And act as silencer for out going air to reduce noise.(Air
silencer)
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19a Tower
19b Tower
19.7 Desiccant
19.11 Oil separator bowl withRanching rings
24 Valve cone for check valve
25 Bracket34 Duplex piston valve
3.Air Reservoir
There are 2 type of reservoir Main reservoir & Auxiliary reservoir
1) Main reservoir can have 200L of air.
2) Auxiliary reservoir can have _______L of air.
B.BRAKE CONTROL EQUIPMENT
The brake system is one of the most important parts of metro and it is controlled
and designed to interface with TIMS(Train Integrated Management System)
with electrical and pneumatic controls. The two think must be taken inconsideration while designing brake system:-
1) Wheel slide protection
2) Fail safe system
92.93 Insulators
(on LTZO15..H)
A Drainage port
O.. Exhaust portP1 Air supply port
P2 Air pipeconnection tomain reservoir
V... Valve seat
34.15 KNORR K-ring
34.17 KNORR K-ring
43 Valve magnet
50 Regeneration choke
55 Piston for pre controlvalve56 KNORR K-ring
70 KNORR K-ring
71 Valve head for bypassvalve
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Main component of brake system are:-
1) BP (Brake Pipe)
2) BCU (Brake Control Unit)
3) BECU (Brake Electronic Control Unit)
4) ASV (Anti Skied Valve)
5) BBU (Block Brake Unit)
1) BAKE PIPE
a. It is a tapped pipe from MRP (Main Reservoir Pressure).
b. Its max. pressure is 5 bar
c. Its used only for braking propose.
2) BRAKE CONTROL UNIT
It is a single board which consist many type
valves as shown in fig.
It has analogue control valve which convert
signal from BECU to required pressure.
a. Combination of different valve used for
different purpose:-
i.A & B used for service brake.
ii.C, D & E used emergency brake.
iii.F & G used for auxiliary unit.
iv.J, L, M & N used for testing fittings
Different type of braking:-
i. Service brakeii. Blend brake
iii.Emergency brake
iv. Parking brake
v. Holding brake
vi. BP- back up brake
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i. SERVICE BRAKE :-
a. It is ED (Electro Dynamic) brake.
b. It is also Regenerative brakes
c. In this motor work as generator and back
EMF is produce which recharge the battery.
d. And due to generative action and opposite
field a braking force is applied on the motor.
e. This brake is controlled by C/I of M car.
ii. BLEND BRAKE
f. It is blending of ED (Electro Dynamic) brake
& EP (Electro Pneumatic) brake.
g. It is applied when only ED brake is not
sufficient.
h. Then the remaining amount of brake is
applied by EP brake
i. EP brake is control by DT car. Hence blend
brake is collectively controlled by DT & M
car.
M car DT car
Train line
brake demand
Blending request
TCU TCU
BECU
BECU
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F set by M & DT
F set by M EP
ED
V1 V2
iii. EMERGENCY BRAKE
j. The train set is equipped with an emergency
brake loop wire. The emergency brake loop is
connected to the emergency brake magnet
valve. Which is opened when de-energized
and closed when energized (Fail-safe system).
k. Magnet valve is de-energies by driver or
interruption it by pass the MRP i.e. MRP
become 0 bar
l. Analogue control valve on BCU produce a
request signal using load limiting value.
m. Redundancy realized for the emergency brake
pressure generation.
iv. PARKING BRAKE
n. Parking brake is used for parking the train in
depot and these are installed at Driving trailercar and Motor cars (1 set per axle).
o. It can be operated manually or by TIMS.
p. It is spring actuated brake.
q. In this first MRP pressure goes low (< 4.5
bar) by any mean it release the pressure from
spring and brake applied.
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v. HOLDING BRAKE
r. The holding brake is provided to prevent the
train from rolling backwards on a rising
gradient and the train from moving at the
station.
s. This brake is controlled by C/I of M car.
t. The holding brakes are 70% of full service
brakes.
vi. BP- BACK UP BRAKE
u. Additional BP (Brake pipe) controlled back-
up brake system is provided in order to take
over the brake control function in case of
failure of individual electronic or electrical
control elements. The driver can continue to
control the pneumatic friction brake by using
the driver's brake valve.
v. The driver is able to apply or release the
pneumatic brake by operating the driver's
brake valve.
w. By the brake valve the brake pipe (BP)
pressure can be reduced or increased
depending on the time the brake lever is
maintained at "braking" or "driving". During
the normal service brake operation, the drivers
brake valve lever shall be maintained at
"driving"
C.BRAKE ELECTRONIC CONTROL UNIT
1.It is microprocessor based control system which deals with many type
of signal.
2.It works as an interface between TIMS & BCU.
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D. ASV (Anti Skied Valve)
Wheel slide protection is used to optimize the stopping distance and to avoidthe wheel flats under wheel sliding conditions. Wheel slide protection is active
in service brake andEmergency brake.The wheel slide protection acts per bogie on each car by thedump valves (G2).
Wheel-slide protection is operational at all speeds down to 3 km/h.Speed sensormounted on the cover of each axle box, detects the speed of the associatedwheel.
When a potential wheel-slide event is detected, the BECU will release/apply thebrakes through energizing/ de-energizing the magnets of the dump valves oranti skied valve
1 Econnection
2 Double valve
magnet
3 Plate
4 Anchor spring
5 Housing
6 D piston
7 Compressingspring
8 Control
chamber
9 Valve seat Vd10 Bypass nozzle
11 Nozzle D
12 Bracket
13 To brake
cylinder
pressure
supply
14 To the brake
15 Nozzle C
16 Valve seat Vc17 C-piston
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18 Control
chamber
19 Outer valve
seat
20 Inner valve
seat
Block Brake Unit
1 Piston packing ring 44 Compensating link
2 Piston 45 Bracket
3 Piston return spring 46 Return spring
4 Piston pin
5 Cam disc
6 Bearing pin
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7 Cam roller
8 Trust ring
9 Adjuster mechanism
10 Hexagon reset head
11 Ball shaped rod head
12 Torque pin
13 Brake block wedge
14 Brake block shoe
15 Brake block
16 Link pin
17 Hanger
18 Friction member
19 Hanger pin
20 Torsion sprin
L)AIR SUSPENSION EQUIPMENT
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TYPES OF DOOR
PARTITION DOOR
CAB SIDE DOOR
SALOON DOOR
EMERGENCY DOOR
ISOLATION
SWITCH
110 V DC
SUPPLY
DOOR CONTROL UNIT
(DCU)
INPUT SIGNALS
1. CLOSE SIGNAL
2. LOCK SIGNAL
3. EMERGENCY SIGNAL
4. ZERO SPEED SIGNAL
OPEN/CLOSE
COMMAND
TIMS
SOLENOID
MOTOR ENCODER
SPINDLE SHAFT
SPINDLE NUT
DRIVE BRACKET
DOOR PANEL
DOOR
OPEN/CLOSE
BLOCK DIAGRAM OF SALOON DOOR OPERATION
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COUPLERTypes of couplers:
Automatic coupler
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It enables automatic coupling of 2 mechanical units. Besides mechanical
coupling, electric and pneumatic coupling is also achieved.
Semi permanent coupler
It make semi-permanent connection of two cars those form a unit and therefore
need not be separated unless in an emergency or in the workshop for
maintenance.
Types of Coupler
1. Automatic Front Coupler
Coupler Length (from face to pivot) 1350 5 mm
Coupler Weight approx. 485 kg
Maximum Swing of coupler
Horizontal approx 45Vertical approx. 6
2. Automatic Intermediate coupler
Coupler Length (from face to pivot) 1350 5 mm
Coupler Weight approx. 365 kg
Maximum Swing of coupler
Horizontal approx 45
Vertical approx. 6
3. Semi Permanent Coupler
Coupler Length (from face to pivot) 1240 5 mm
Coupler Weight approx. 210 kg
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Maximum Swing of coupler
Horizontal approx 45
Vertical approx. 6
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CONCLUSION
There were many things that I have experience and learned during the eight
weeks of my training in DMRC .The whole training period was very
interesting, instructive and challenging. Through this training I was able to gain
new insights and more comprehensive understanding about the real industry
working condition and practice.
The training provided me opportunities to understand the basic engineering
concepts.
This training was mainly concentrated on study of various parts of Delhi metro
rail corporation and its designing .
At the end I would like to thank all employees in DMRC for giving me
necessary support and guidance in order to bridge the gap between my
knowledge and the industry practices.
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BIBLIOGRAPHY
1. Material Available on DMRCs INTRANET.
2. Material Available In DMRC STUDY BOOKS.
3. Material available On Wikipedia.
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