This presentation is about crane manufacturing in the machinery division of JSPL located in Raipur, Chattisgarh. The topic of this presentation is EOT i.e. ELECTRICAL OVERHEAD TRAVELING CRANE.

1. VOCATIONAL TRAINING
PRESENTAION
ON
JINDAL STEEL & POWER
MADE BY :- KAMAL NAYAK
5TH SEMESTER
MECHANICAL BRANCH
S.S.I.P.M.T RAIPUR (C.G.)

2. CONTENTS
• INTRODUCTION - JSPL
• CRANES
• ELECTRICAL OVERHEADED TRAVELLING
CRANE (EOT CRANE)
• BASIC CRANE COMPONENTS
• HOISTING EQUIPMENT
• MOTORS AND CONTROLS

3. INTRODUCTION - JSPL
 Jindal steel and power limited (JSPL) is an Indian steel and energy
company based on New Delhi, India. With turnover of approx. US$
3.3 billion.
 In terms of tonnage, it is the third largest steel producer in India. The
company manufactures and sells sponge iron, mild steel slabs,
Ferro, chrome, iron ore, mild steel, structural, hot rolled plates and
coils and coal based sponge iron plant.
 The Machinery Division of JSPL is spread over an area of more than
1,62,000 sq. meters at Mandir Hasud,13kms from Raipur on the
NH-06,towards Kolkata.

4. The Machinery Division
 The Machinery Division has 10 Covered bays Covering an area of
52,000 sq. Meters .
 The key strength of the Division is the manufacture and supply of
critical equipment’s ,pressure vessels and steel castings for steel
power, cement and mining industries.
 The facilities available at the Machinery Division are steel foundry,
Casting Machine shop with latest CNC Machines, Fabrication &
assembly shops, shot blasting paint booth & heat treatment
furnaces.

5. CRANES
 A Crane is a type of machine, generally equipped with a hoist rope, wire
ropes or chains, and sheaves, that can be used both to lift and lower
materials and to move them horizontally.
 It is mainly used for lifting heavy things and transporting them to other
places.
 Cranes are commonly employed in following sectors :-
1) The transport industry for the loading and unloading of freight
2) In the construction industry for the movement of materials
3) In the manufacturing industry for the assembling of heavy equipment
TYPES OF CRANES
1. Over Head Crane
2. Mobile Crane
3. Fixed Crane

6. 1) Over Head Crane
• An overhead crane, commonly called a bridge crane. This type of
crane are mainly found in industrial environments.
• Ex-EOT Crane, Rotary Crane

7. 2) Mobile Crane:
• A Mobile crane is a cable-controlled crane mounted on crawlers or rubber-tired
carriers or a hydraulic powered crane with a telescoping boom mounted on truck
type carriers or as self-propelled models.
• Ex-Truck mounted crane, Aerial crane.

8. 3) Fixed Crane
• The structure basically is fixed in one place.
• They have ability to carry grater load and reach greater height due to increased
stability
• Ex-Tower crane, Jib Crane, Loader Crane

9. ELECTRICAL OVERHEADED TRAVELLING CRANE
(EOT CRANE)
• An E.O.T. crane stands for Electric Overhead Travelling crane. This is used
for handling & moving a maximum specified weight of the components
called capacity of the crane within a specified area. The crane can be
operated manually or by electric power.
• Electrically Operated crane can be divided into different sections as
follows:-
• (a) Bridge girders
• (b) End carriages
• (c) Hoisting trolley also known as crab
• (d) Long travel machinery
• (e) Driver’s cabin/Floor operation.
• (f) Balancer frame

10. Types Of EOT Cranes
a) Top running single girder bridge cranes
b) Top running double girder bridge cranes
c) Under-running single girder bridge cranes.
EOT Cranes come in various types:-
1) Single girder cranes - The crane consists of a single bridge girder supported
on two end trucks.
2) Double Girder Bridge Cranes - The crane consists of two bridge girders
supported on two end trucks. The trolley runs on rails on the top of the bridge
girders.
3) Gantry Cranes - These cranes are essentially the same as the regular
overhead cranes except that the bridge for carrying the trolley or trolleys is
rigidly supported on two or more legs running on fixed rails or other runway.
4) Monorail - Monorail beams are usually I-beams (tapered beam flanges).

11. BASIC CRANE COMPONENTS
1.Bridge - This is the main traveling
structure of the crane. The
bridge also supports the
trolley and hoisting
mechanism for Up and
down lifting of load.
2.End girder - It is an assembly
consisting of structural
members, wheels,
bearings, axles, etc.
which supports the
bridge girders or the
trolley cross members.

12. 3.Main Girder - The principal
horizontal beam of the
crane bridge which
supports the trolley
and is Supported by
the end trucks.
4.Cross Travel Rail - The rails, beams, brackets
and framework on which the crane operates.

13. 5.LT Rail - The rail supported by the runway beams on which the crane
travels.
6.Hoist - The hoist 6.mechanism is a
unit consisting of a motor
drive, coupling, brakes,
gearing, drum, Ropes, and
load block designed to
raise, hold and lower the
maximum rated load.

14. 7.Trolley - Trolley frame is the
basic structure of the
trolley on which are
mounted the hoisting
and traversin
mechanisms.
8.Bumper (Buffer) - An energy absorbing
device for reducing
impact when a moving
crane or trolley reaches
the end of its permitted
travel.

15. HOISTING
EQUIPMENT Hook Assembly
1) Hook assembly for electric hoists shall be carried on antifriction bearings to
permit free swivel under rated-capacity load without twisting load chain or
wire.
2) Each hook assembly shall include a machined and threaded shaft and
swivel locknut with an effectivelocking device to prevent nut from backing off.

16.  Gear Assembly
1) Gear shafts shall be manufactured from high-carbon steel or alloy steel,
machined and ground for accurate fit and splined for fitting to the mating gear.
2) Gear-train assembly shall be carried on antifriction bearings and enclosed in
the hoist frame casting.
3) Frame casting shall be provided with lubrication fittings and inspection ports.

17.  Rope Drum
1) Rope drum shall be hardened steel or special-grade cast iron.
2) Drum shall have accurate, machine-cut grooves, cut to full depth of wire-rope
radius, with rounded corners of dimension as required for the indicated lift.
3) Drum shall be flanged at each end and shall have enclosed tops and sides to
preclude cable binding and jamming.

18.  Bearings
1) Bearings in the hoist mechanism shall be precision manufactured antifriction
bearings, needle-type roller bearings or end and radial thrust ball bearing
operating in an oil bath and conforming to the requirements specified.
2) Hook bearings shall be of the thrust type, designed on the basis of hours of life
and load for the applicable hoist duty class at an arbitrary speed of 10 evolutions
per minute.
3) Dead load and hook load shall be reduced to percentage with normal impact,
shock, and similar loadings omitted.

19.  Brakes
1) Automatic brakes shall be provided for all motions. Drum brakes are preferred
on hoists and should have taper bores to mate to the gearbox/motor shafts.
2) These shall be applied immediately the current is switched off or fails from any
cause. Brakes may be applied by mechanical, electrical, pneumatic, hydraulic,
or gravity means.

20.  Guards
1) If hoisting ropes run near enough to other parts to make fouling or chafing
possible, guards shall be installed to prevent this condition.
2) Exposed moving parts such as gears, set screws, projecting keys, chains,
chain sprockets, and reciprocating components which might constitute a
hazard under normal operating conditions shall be guarded.

21. MOTORS AND CONTROLS
Depending on the application, the EOT cranes require
motors at three areas:-
a) Bridge and end truck motors
b) Trolley motors
c) Hoist motors
Motor Specifications:-
1) Motors shall be fixed, dual or variable speed drive and shall be suitable for
quick reversing crane duty.
2) The motors shall be high-starting-torque, high-slip, squirrel-cage AC motor or
alternatively where specified shall be a variable-speed, low-slip, wound-rotor AC
motor.
3) Drives shall be rated to carry the full load current of the hoist motors continuously
for 10 minutes. Drives shall be rated to carry the full load current of the long and
cross travel motors continuously for 5 minutes.
4) Motors shall be totally enclosed, non-ventilated type, certified for 30-minute time-
rated operation at full identification plate power output in an ambient temperature
of 104ºF (40ºC).

22. THANK
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