VOCATIONAL TRAINING PRESENTAION

ONJINDAL STEEL & POWER

MADE BY :- KAMAL NAYAK 5TH SEMESTER

MECHANICAL BRANCH S.S.I.P.M.T RAIPUR (C.G.)

CONTENTS

• INTRODUCTION - JSPL• CRANES• ELECTRICAL OVERHEADED TRAVELLING

CRANE (EOT CRANE)• BASIC CRANE COMPONENTS• HOISTING EQUIPMENT• MOTORS AND CONTROLS

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.

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.

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

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

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.

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

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

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).

BASIC CRANE COMPONENTS1.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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

MOTORS AND CONTROLSDepending 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).

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