vibro feeders

APPLICATIONS OF VIBRO FEEDERS IN

VISAKHAPATNAM STEEL PLANT

MINIPROJECT REPORT

A Dissertation submitted in partial fulfillment of the

Requirement for the award of the degree ofBachelor of technology

In

Electrical & Electronics EngineeringBY

L .NAVEEN (09JH1A0228)

B .SANKARA RAO (09JH1A0207)

K .VENU PRASAD (09JH1A0226)

N .MADHU BABU (09JH1A0230)

G .VIDYADHAR (09JH1A0248)

G.V.V.R .INSTITUTE OF TECHNOLOGY,

BHIMAVARAM

ACKNOWLEDGEMENT

We express our deep sense of gratitude to our project guide

Sri. S.SUDHAKARA REDDY Asst. General Manager (E), Steel Melting

Shop of Visakhapatnam Steel Plant for his excellent guidance,

encouragement and valuable advice throughout the course of my

project.

We are thankful to the Training Department for providing us

an opportunity for doing this project.

L.NAVEEN

B.SANKARA RAO

K.VENUPRAS

AD

N.MADHU

BABU

G.VIDYADHAR

CERTIFICATE

This is to certify that Sri L.NAVEEN , Sri B.SANKAR RAO , Sri K.VENU

PRASAD , Sri N.MADHU BABU , Sri G.VIDYADHAR has done the

project titled“APPLICATIONS OF VIBRO FEEDERS”

under my guidance as a partial fulfillment of 3rd B.Tech (EEE)

HEAD OF THE DEPARTMENT INTERNAL GUIDE

Sri V.VERRAJU S.SUDHAKAR REDDY,

EEE Department, Asst.Genaral Manager (E),

G.V.V.R .INSTITUTE OF TECHNOLOGY , Steel Melt Shop,

BHIMAVARAM. VISAKAPATNAM STEEL

PLANT.

CERTIFICATE

This is to certify that Sri L.NAVEEN has done the mini project titled“APPLICATIONS OF VIBRO FEEDERS”


.


Sri V.VERRAJU S .SUDHAKAR REDDY,



BHIMAVARAM. VISAKAPATNAM STEEL PLANT.

.

CERTIFICATE

This is to certify that Sri B.SANKARA RAO has done the mini

project titled “APPLICATIONS OF VIBRO FEEDERS” under my

guidance as a partial fulfillment of 3rd B.Tech (EEE).






CERTIFICATE

This is to certify that Sri K.VENU PRASAD has done the mini project titled“APPLICATIONS OF VIBRO FEEDERS”







CERTIFICATE

This is to certify that Sri N.MADHU BABU has done the mini project titled“APPLICATIONS OF VIBRO FEEDERS”







CERTIFICATE

This is to certify that Sri G.VIDYADHAR has done the mini project titled“APPLICATIONS OF VIBRO FEEDERS”







DECLARATION

We here by solemnly declare that the mini project titled

“APPLICATIONS OF VIBRO FEEDERS” is a genuine

bonafide work done by us and is not submitted by any others at any

time before.

The Project work was done in partial fulfillment of the requirements

for the completion of 3rd B tech (EEE)

L.NAVEEN

B.SANKARA RAO

K.VENU PRASAD

N.MADHU BABU

G.VIDYADHAR

CONTENTS

S.NO. Title

1. Introduction to VSP

2. Overview of SMS

3. Description of VIBRO FEEDERS.

4. Operation of VIBRO FEEDER derives details.

5. Importance of storage and handling instructions.

6. Installation process.

7. Feeder controls.

8. Circuit diagrams for vibro feeders.

9. Applications.

10. Advantages and disadvantages of vibro feeders.

1. Introduction to Visakhapatnam Steel Plant

Visakhapatnam Steel Plant (VSP), the first integrated shore based ( bay of

Bengal shore at east side) steel plant in the public sector, is located at

Visakhapatnam in the State of Andhra Pradesh with a capacity of 3 MT liquid

steel production per year. Expansion works going on to increase capacity to 6.3

MT per year. Planning to expand to 16MT capacity by 2020 in phased manner.

Besides this, VSP has five Regional Marketing Offices and 21 Branch Sales

Offices with a wide network of Stockyards all over the country to support

marketing and distribution of its products and services.

VSP is renowned for its modern technology and facilities. Many of

them are incorporated for the first time in the country. The salient

technological features are:

2 7m tall Coke Oven Batteries with coke dry quenching.

3 Biggest Blast Furnaces in the country with 3200 cum useful volume.

4 Bell less top charging system in Blast Furnaces (BF).

5 100% slag granulation at the BF cast house.

6 LD gas recovery system.

7 100% Continuous Casting of Liquid Steel.

8 High speed and high capacity Rolling Mills.

9 Extensive Waste heat recovery systems.

10 Comprehensive pollution control measures.

VSP is an integrated steel plant that produces long products. Its products

are Wire Rods, Plain and Reinforced Bars, Light and Medium Structural, Rounds

Squares, Basic grade Pig Iron and Coal Chemicals, etc. In addition to finished

steel, the product mix of VSP envisages production of semi-finished products

like Blooms and Billets with a view to balance the product-mix. VSP caters to

the Construction industry, Railways, Automobile industries, Engineering

industry, Re-rolling industry, Wire drawing industry, Traders, Conversions

Agents etc.

VSP, a fully certified ISO 9002 company, was the first Integrated Steel

Plant in the country to achieve this distinction. Subsequently, this was updated

to the prestigious ISO 9001:2000 certificate for Quality Management System.

VSP also acquired ISO-14001:1996 certificate for Environment Management

System and OHAS-18001 certificate for Occupational Health and Safety

Management System.

VSP laid a special attention for adopting the latest state-of-the-art

technology. VSP has self-sufficiency in utilities and power for unhindered

production, utilities like compressed air, oxygen, nitrogen etc and power is

generated in the captive plants. The technologies in VSP help in the production

by maintaining a pollution free and clean environment.

VSP has been incorporating modifications in the existing technology in

order to take advantage of emerging technology. With a view to remain

competitive, VSP has been incorporating latest technologies including

information and communication technologies and automation from time to

time. Some of these are adoption of improved levels of automation at various

places, introduction of expert system in Blast Furnaces, Sub-Lance and Slag

Splashing in Converters, Gaga-cutting machine in Continuous Casting

Department (CCD) and Oil Firing System in the Reheating Furnaces of Rolling

Mills.

Steel comprises of one of the most important inputs in all sectors of

economy. Steel industry is both a basic and a core industry. Steel is versatile

and indispensable item, which can be traced mainly for three reasons. They

are,

1 It is the only material item, which can be conveniently and

economically produced and tonnage qualities.

2 It has got very good strength coupled with ductility and

malleability.

3 Its property can be changed over a wide range. It forms alloys

easily with many of common elements.

The properties can be manipulated to any extent by proper heat

treatment techniques. Taking these factors into consideration it can be said that

the types of steel available are innumerable.

MAIN PRODUCTS OF VSP( PRODUCT MIX):

Unlike many other steel plants VSP is an integrated steel plant,

producing many products like Blooms, Channels, Angles etc., other than these

VSP also produces many by-products that are derived during the production of

coke and iron . The main products and the by-products that are produced are

shown in the table below.

TABLE –1 :

Steel products By-Products

Angles Nut coke Granulated slag

Billets Coke dust Lime fines

channels Coal tar Ammonium sulphate

Beams Anthracene oil

Squares HP naphthalene

Flats Benzene

Rounds Toluene

Re-bars Xylene

Wire rods Wash oil

There are more than 100 departments like Personal, Finance, Purchase,

Marketing, Production etc. in Visakhapatnam Steel Plant. Again there are Sub

departments in each department. In production there are no. of departments.

2. MAJOR DEPARTMENTS IN VSP

RAW MATERIAL HANDLING PLANT (RMHP):-

The RMHP receives the basic materials like iron ore, fluxes (lime stone,

dolomite), coking and non coking coals etc. required for the steel making

process from various sources through wagons, dumped by wagon tipplers,

which are stacked and reclaimed by stackers-cum reclaimers and distributed to

various departments of Visakhapatnam steel plant through conveyer systems.

COKE OVENS (CO):-

Blast Furnaces, the mother units of any steel plant require huge quantities

of strong, hard and porous solid fuel in the form of hard metallurgical coke for

supplying necessary heat. This heat is used for carrying the reduction and

refining reactions besides acting as a reducing agent.

Coke is manufactured by heating the crushed coking coal (below 3mm)

in the absence of air at a temperature of 1000degrees centigrade and above

for a period of 16 hours to 18 hours. A coke oven comprises of two hollow

chambers namely coal chamber and heating chamber. The heating chamber

consists of gaseous fuels such as blast furnace gas, coke oven gas etc. These

gases are burnt and the heat so generated is conducted through the common

wall to heat and carbonize the coking coal placed in the adjacent coal chamber.

Number of ovens built in series one after the other forms a coke oven battery.

At VSP there are three coke oven batteries, 7 meter tall and having 67

ovens each. Each oven is having a volume of 41.6 cubic meter and can hold up

to 31.6 tonns of dry coal charge. The carbonization takes place at 1000 to 1050

degrees centigrade in the absence of air for 16 to 18 hours.

Red-hot coke is pushed out of the oven and sent to coke dry cooling

plants for cooling to avoid its combustion. There are three Coke Dry Cooling

Plants (CDCP) each having four cooling chambers. The capacity of each cooling

chamber is 50 to 52 TPH. Nitrogen gas is used as the cooling medium.

Generating steam and expanding in two backpressure turbines to produce 7.5

MW power each do the heat recovery from nitrogen.

The coal chemicals such as benzol, tar, ammonium sulphate etc. are

extracted in coal chemical plant from co gas. After recovering the coal

chemicals the gas is used as a by-product fuel by mixing it with gases such as

BF gas, LD gas etc. A mechanical, biological and chemical treatment plant

takes care of the effluents.

COKE OVEN PLANT COKE

SINTER PLANT:-

Sintering is one of the most widely used and economic agglomeration

techniques. Sinter is a hard and porous lump obtained

by agglomeration of fines of iron ore, coke, limestone and metallurgical waste.

Sinter increases the productivity of blast furnace, improves the quality of pig

iron and decreases the consumption of coke rate .It consists of two 312 square

meter sinter machines with 420 square meter straight stand type coolers for

annual production of 5.26 MT sinter.

SINTER MACHINE

BLAST FURNACE (BF):-

Pig iron or hot metal is produced in the Blast Furnace .The furnace is

named as BF as it is made to run with blast at a high temperature and a pressure

of 1500 degrees centigrade. Raw materials required for pig iron and iron are

iron making ore, sinter, coke and limestone. There are two 3200 cubic meter

blast furnaces to meet 3.0 MT annual metal requirements. Each furnace is

provided with a set of four hot blast furnace stoves designed for supplying air

blast up to 1300degrees centigrade. Three turbo blowers, one for each furnace

and one stand by common to both furnaces are provided with 12 MW top

pressure recovery turbo generating power. BF gas is produced from each

furnace is being cleaned in gas cleaning plant which comprises dust catcher,

high pressure scrubber and is distributed through out the plant as a fuel.

BLAST FURANCE

ROLLING MILLS (RM):-

Blooms cannot be used as they are in daily life. These blooms have to be

reduced in size and properly shaped to fit for various jobs. Rolling is one of the

mechanical processes to reduce large size sections in to smaller ones like flats,

angles, channels, T- sections I- beams, rounds, ribbed bars, squares etc,. . The

cast blooms from CCM are heated and rolled in to long products of different

specifications like high capacity, sophisticated high-speed rolling mills. These

rolling mill complexes comprises of,

1 Light and Medium Merchant Mill (LMMM)

2 Wire Rod Mill (WRM)

3 Medium Merchant and Structured Mill (MMSM).

Each mill is well equipped with required number of walking beam

furnaces for heating walking beam furnaces, for heating blooms or billets.

Except for Wire Rod Mills, each furnace is provided with evaporative cooling

system for generation of steel for plant consumption.

BARS COILING

THERMAL POWER PLANT (TPP):-

The estimated power requirement for VSP is 280MW at 3.0 MT stages,

the peak load being 292 MW and the essential loads being 49 MW. The

generating capacity of TPP is 286.5 MW. A captive power has 3x60 MW, 1X67.5

MW, 2X12 MW (Gas Expansion Turbine Station in Blast Furnaces ), 2X7.5MW

( Back Pressure Turbine Station in Coke Ovens ) turbo-generator sets and

5x330 tonns /hour steam generators. In this plant, 6000 Nm^3/min turbo

blowers are being provided for supplying cold air to blast furnaces. The power

generated will be 3-phase,11KV, 50Hz.

WATER MANAGEMENT DEPARTMENT:

The plant area is approximately 5.5km x 5.5km and the boundary wall

length is 30km.Such a huge plant is provided with 30 pump houses. Most of

the water was recycled through cooling towers. Most of the departments are

dealt with high temperatures like hot coke, at a temperature of 1000degrees

centigrade, sinter 800degrees centigrade, BF 1500degrees centigrade, steel

1700 degrees centigrade and boilers 350 degrees centigrade. These systems

are cooled with water. Each Pump House is having at least 25 large pumps with

squirrel cage induction motors.

AIR SEPERATION PLANT(ASP):

To cool the hot coke, liquid nitrogen is required. In BF, pressure is

developed by using nitrogen and super heated oxygen will be pumped into

BFs. In SMS, oxygen is required for steel making, nitrogen is required for slag

splashing, argon is required for purging and stirring. All these gases are

separated from air. Here air is compressed with the help of 11 MW, 11KV

synchronous motors (4 nos). Air in the gaseous state is converted into liquid

state. From this liquid air, Nitrogen, Oxygen and Argon are separated and

compressed to store in liquid forms and will be vaporized & delivered in

gaseous state to required sections through pipe lines.

ELECTRICAL REPAIR SHOP(ERS):

Total plant is installed with single-phase DC motors, squirrel cage

induction motors, slip ring induction motors, electro-magnets, transformers,

generators etc (The total items are > 7500). All these items will be repaired in

ERS. Yearly around 2200 items are being repaired in ERS; most of them are

being rewounded.

DISTRIBUTION NETWORKS:

This department deals with HV and EHV i.e. from TPP 11KV emergency

load distribution, stepping up of 11KV to 220 KV, & distribution of 220KV in the

plant, synchronizing with APSEB grid, to export or import power, stepping

down to 33KV/11KV/6.6KV. 6.6KV is used for exhaust motors (50 motors are

present). 33KV will cater to LF and town ship. In town ship 33KV will be

stepped down to 11KV and distributed to 20 sub-stations in town ship.11KV in

the plant will be distributed to 1000 LCSS, where 11KV will be stepped down to

LT supply for utilisation. Except 220KV all other supplies are under ground

cables.

220KV/33KV or 220KV/11KV/6.6KV (two secondary windings) will be

done at LBSS (7 nos). Each LBSS have 4 nos, 220KV transformers.220KV

Potential Transformers, Current Transformers, SF6 breakers etc.11KV and

6.6KV will be distributed to various LBDS (20 nos).

6.6KV and some 11KV feeders (ASP) will feed HT motors (VCB's). Remaining

11KV will be supplied to LCSS transformers where 11KV/415KV step down will

take place. Individual departments will deal LT.

COMMUNICATION SYSTEMS IN VSP:-

In this modern age of industrialization, telecommunications plays a very

important role in coordinating the activities of various departments or sections

and in achieving the set targets and also in improving the performance of any

organization. In Visakhapatnam Steel Plant, different types of communication

systems are being used to meet the internal and external communication needs.

These are broadly classified as follow:

a. General purpose communication systems.

b. Process communication systems.

c. Monitoring & Signaling Systems.

GENERAL PURPOSE COMMUNICATION SYSTEMS:-

The following facilities are provided under the category of general purpose

communication systems.

2500 Lines Electronic Exchange of Bharat Sanchar Nigam ltd (BSNL) in

Project Office is catering to the needs of Plant Area and Sectors-I to VII in

township. Another 2000 Lines Electronic Exchange of Bharat Sanchar Nigam

ltd (BSNL) in Township is catering to the needs of Sectors-VIII to XI in

Township.

The 3000 Lines electronic exchange in plant and 2000 lines exchange in

township are having the following facilities.

Extension (subscriber) to extension call, Auto call back, Hot lines, Music

on hold, Reminder Alarm, Automatic line testing facility, Faults man ring back,

Call consult facility, Malicious call tracing facility, 3 party conference Facility

and Howler Tone alert etc. All exchanges working in the steel plant are

interconnected by means of junction lines and have closed numbering scheme.

The 2000 lines exchange in township is interconnected to the BSNL

network. Due to this interconnection all the subscribers of this exchange can

receive incoming calls from any part of the world. A few subscribers are

provided with facility to contact subscribers connected to the BSNL network

and cellular and mobile phones in and around Visakhapatnam.

PROCESS COMMUNICATION SYSTEMS: -

To facilitate coordination, operation & management activities of

production, maintenance & service departments, the following process

communication systems are provided:

a) Dispatcher communication system

b) Loudspeaker intercom systems

c) Loudspeaker broadcasting systems

d) Loudspeaker conference communication system

e) Industrial public address system

f) Hotline communication systems

g) VHF communication systems

MONITORING AND SIGNALING SYSTEMS: -

To facilitate monitoring production, maintenance & service activities, the

following monitoring and signaling systems are provided:

a) Closed Circuit Television Systems (CCTV)

b) Central fire alarm signaling system

c) SCADA system

d) Shift change Announcement Siren System and air raid-warning system

3.STEEL MELTING SHOP

STEEL MELT SHOP (SMS):-

Steel is an alloy iron and carbon, where carbon should be less than 2%.

Hot metal produced in B.F contains impurities like carbon, sulphur,

phosphorous, silicon etc., these impurities will be removed in steel making by

oxidation process. There are three L.D converters to convert hot metal in to

steel. The steel melt shop comprises two 1300-ton hot metal mixers, three 130-

ton LD converters and six 4-stand bloom casters. Each converter is being

provided with gas cleaning plant for cleaning and recovery of LD gas, which

will be used as a fuel in plant.

CONVERTER IN SMS

Continuous Casting Machine (CCM) receives Liquid Steel from the

LD Converters and 100% Continuous casting is done in these machines.

CCMs produce 320mm x 250mm and 250mm x 250mm sized blooms,

which are sent to LMMM & MMSM rolling mills for rolling as per the

customer requirement for sale. This is a continuous process & CCMs

are expected to cast liquid steel without any interruption for profitable

operation & higher productivity. After tapping is done from convertor,

liquid steel is brought to Continuous Casting Machine in a ladle. From

ladle liquid steel is throttled into the Tundish through which liquid steel

is throttled into the moulds for casting.

CONTINUOUS CASTING DEPT

SECTIONS OF SMS

MIXER SHOP

Metallic horizontal cylindrical devices with refractory brick lining

inside are called mixers. Liquid pig iron at 1500oC from Blast Furnaces will

be stored in mixers (2 no of mixers are there in SMS), each of them are

capable of storing 1300 T of hot metal. For this purpose, two no. of 200T

capacity EOT (Electrically over transmission) cranes installed. Each mixer is

tilted by two Thyrister controlled DC motors simultaneously to tap liquid

metal whenever required. Each time 150 T of hot metal will be collected in

to ladle and will be shifted to converter shop by Hot metal transfer car

driven by thyristor control DC motor.

CONVERTER SHOP

Pig iron will have the impurities like Sulpher& Phosphors and 4% carbon.

Steel will have 1% carbon. To convert liquid pig iron into liquid steel LD

converters will be used. 3 nos. of LD converters are there in converter shop.

Four thyristor controlled DC motors will tilt each converter simultaneously.

150T of Liquid pig iron (hot metal) will be charged into converter. For this

purpose, two no. of 200T capacity EOT (Electrically over transmission)

cranes installed. Oxygen will be blown in to converters through lance for 17

minutes to get steel. Each converter will have 2 lances (one is standby),

each driven by thyristor controlled DC motor. After process 150 T of liquid

steel at 1700oC is collected in to refractory brick lined steel vessel ( called

ladle ), which placed on thyristor controlled DC motor driven Steel Transfer

Car (STC). Similarly Waste material (called liquid slag ) will be collected into

slag pot, which placed on thyristor controlled DC motor driven Slag pot

Transfer Car (SPTC). To treat at ladle furnace, injection refining & up

temperature and return of ladles 3 more such cars will be used.

Large quantity of Carbon Monoxide will be produced in this process,

which will be collected by induce draft fans and used as fuel in reheating

furnaces. These fans will be driven by 6.6 KV, 2.5 MW, 3- phase induction

motor. Each converter will have one motor. For dust exhaust system 6.6

KV, 1.0 MW, 3- phase induction motor will be used ( one for Converter shop

and one for mixer shop ). For cooling system each converter will have 4

circulating water pumps, 4 fin fan coolers, 2 makeup water pumps. All these

motors are 3- phase induction motors.

Raw materials will be shifted by 7 conveyors and these motors also 3-

phase induction motors. Slag yard and scrap yard are equipped with 2 EOT

cranes each. Slag yard was equipped with 3- phase induction motors driven

2 slag dump cars. Ladle preparation bay was equipped with 3 EOT cranes.

CONTINUOUS CASTING DEPARTMENT

Steel from converters will be further treated by adding ferro-silicon,

ferro-manganese etc., and trapped oxygen will be removed by adding

aluminum. This will be mixed by argon rinsing. Temperature will be raised in

Ladle furnace or IRUT if required.

With the help of 200 T EOT crane (3 nos are there) ladle will be placed

on stand and Steel will be solidified (casted) into rectangular bars called

blooms. These blooms are stored in Bloom Storage yard and dispatched to

rolling mills with the help of EOT cranes for required shape.

EOT CRANES

In SMS itself 50 EOT cranes are available. These cranes are installed on

rails at certain height Power supply will be tapped from bus bars (called Direct

Supply Lines) through sliding current collector assembly. Three movements in

both directions with three or four different speeds are required namely Long

Travel, Cross Travel and Hoist. Some cranes will have two cross travels and two

or three hoists. Long travel will have four ( two in case of very small cranes )

slip ring induction motors. Each Cross Travel, Hoist (2 motors in case of big

cranes ) will have one slip ring induction motor.

VIBRO FEEDERSDESCRIPTION:-

The TRF Electro magnetic Vibrating Feeder consists basically of:

1. A trough for conveying the material. This is usually of Fabricated mild Steel construction,Either open, enclosed, tubular, or of a section specially designed to suit requirements and in general can be supplied with liners or wearing plates when necessary .

2. A vibrator unit of cast iron construction which is generally mounted below the trough.

3. A spring system under compression which connects together the trough and the vibrator unit.

4. An Electromagnet consisting of a laminated armature attached to the trough and an E or U shaped laminated core attached to vibrator unit. The core separated

from the armature by an air gap is fitted with either one or two coils which are energized by a pulsatingcurrent .The machine, therefore,forms a spring-connected two-mass vibration system with the electromagnet providing the exciting force.

The springs are so chosen that the natural frequency of the machine corresponds approximately to the frequency of the pulsating power supply. In this way full advantage is taken of the high amplitude and low power consumption associated with a two-mass vibrating system operating under conditions of resonance.

The feeder can be supported in position by means of suspension rods or by floor mountings and in each case adequate vibration absorbers are incorporated.with single vibrator feeders a combination of suspension and floor-mounting is permissible, but is not recommended for multi vibrator machines.

Vibro –conveyors, long feeders ,and some large heavy duty feeders are fitted with more than one vibrator. With such machines all vibrators automatically operate in synchronism when connected to the same power supply.

Feeder Grizzlies are similar to standard feeders with the exception that an inclined section of self-relieving Grizzly bars is fitted at the discharge end.

Specially designed troughs for de-breezing,bagging, spreading etc.., are also available to suit particular requirements.

Vibro feeder internal diagram

Principle of operation:-The vibrator coils are energized by a unidirectional pulsating current derived from the A.C mains supply by means of half wave rectification or by the electronic methods. Thus 50 impulses per second are produced when operating on the standard 50 cycles supply.

On the powered part of the cycle, i.e, when current is allowed to flow, magnetic attraction takes place between the core and armature of the electromagnet. The trough and the vibrator unit are therefore drawn towards each other, and at the same time the spring system is deflected.

The resulting restoring force built up in the deflected spring causes the return stroke to be completed during the non-powered part of the cycle ,and the trough and the vibrator unit therefore move away from each other.

This sequence is repeated during each complete full cycle of the A.C. power supply causing the machine to vibrate at the same frequency as that of the supply, i.e. 50 vibrations per second on a 50 H.Z supply.

Some small light duty feeders operate direct from the A.C. mains without half-wave rectification .thus,as the coils are energized twice each complete cycle the frequency of vibration is twice that of the power supply i.e.100 vibrations per second on a 50 cycle supply.

The amplitude of vibration is controlled by varying the power input to the vibrator coils by means of a thyristorised electronic controller or a rheostat or a variable transformer suitable for 415 volts, single phase 50 cycle supply.

STORAGE AND HANDLING INSTRUCTIONS:-

STORAGE:-

1. Store the machine under the cover of roof if possible or otherwise it should be necessarily coverd by tarpaulins.

2. The springs must not be taken out or loosened and the trough should not be seperated from the casting while storing or installing the equipment. However,if it is unavoidable please contact TATA-ROBINS-FRASER LTD,jamshadpur -831007.

3. Take extra care to avoid the possibility of water entering the coil & making it damp.

4. The suspension rods should be carefully stored to avoid the possibility of bending and threads being spoiled.

5. Other accessories like electronic controller or rectifier,rheostat etc.. should be kept with extreme care under the cover of roof and extra care should be taken to avoid the possibility of water entering and making the equipment damp.

6. Do not remove or loosen any bolt.

HANDLING :-

1. Avoid dragging,bumping and side jacking to prevent distortion.

2. Do not sling around springs and around the trough.

3. Do not open out or cut off any part of the feeder. The suspension rods can be opened if it is necessary.

4. Extra precautions should be taken not to disturb the position of the springs while handling or installing.

5. All the spare parts should be stored in a dry and clean area protected from the weather.

INSTALLATION

GENERAL:-

Feeders and feeder grizzlies can usually be erected in position without any dismantling of the machines being required.

If however,sight conditions make it necessery for the trough to be removed from the vibrator bracket to facilitate erection ,care should be taken to ensure that on reassembly all bolts fixing the trough to the vibrator bracket are thoroughly tightened.high strength friction grip bolts,when fitted,should be tightened in accordance with the torque values as givcen under “MAINTENANCE”.

All bolts should be further checked for tightness after a week’s operation.

If further dismantling is found to be necessary, e.g,removal of the vibrator bracket from the vibrator assembly,the advice of TRF should be obtained.

ANGLE OF INSTALLATION :-

For free –flowing materials the normal angle of installation of the feeder trough is 10 deg downhill, unless otherwise agreed or advised by TRF.

For sticky materials provision should be made to enable the angle to be increased to at least 15 deg in order to facilitate the flow of material.

SUSPENDED TYPE FEEDERS :-

Suspension rods should always be attached to a main structure.

Suspension from long un supported spans of structural steel work should be avoided as loss of effective vibration in the machine will occure if the structure is insufficiently rigid and likely to flex.

Suspension rods should be supported by a plate or bracket not less than ¾ ‘thick mounted at 90 deg to the line of the rods.

All rods should be well clear of local obstructions to allow the feeder to swing freely under working conditions. This is particularly important when rods have to pass through a concretefloor, or between parts of deep section channels.

The inclination of suspension rods will depend on the position of the support points, but they must be symmetrically inclined when viewed from the end of the feeder and vertical when viewed from the side. By splaying out the rods symmetrically excessive side movement of the feeder can be prevanted.

Each pair of rods should be evenly loaded. The loading on any rod can be adjusted by slightly lengthening or shortening the effective rod length by means of the fixing nuts or turnbuckle, if fitted.

When a feeder is suspended directly from the inclined sides of a bunker the fixing brackets must be set out sufficiently to allow adequate adjustment to be made to the suspension rod lengths should it be found necessary to alter the angle of installation of the feeder.

Each suspension rod is held bymeans of two nuts which should be located and securely locked together, on TOP of the supporting bracket or structure.

MINIMUM LONGITUDINAL AND LATERAL CLEARANCES :-

As some swinging movement of the feeder may take place under the influence of the load, particularly if this is intermittent, sufficient clearance must be provided to prevent the feeder from striking the chutes or adjcent steel work. Minimum longitudinal clearance should be ‘2’and the lateral clearance should be ‘1’approx.

FLOOR MOUNTED TYPE FEEDERS

A concrete base is recommended wherever possible but if the feeder is to be mounted on a steel structure it is essential that the members carrying the feeder are sufficiently substantial and rigid to prevent bending or whipping occurring under the effect of vibration.

Floor mounting plates with locating rings attatched are supplied for bolting down the concrete base or supporting structure to locate the rubber or coil spring absorbing feet.

Clearances between chute work ,bunker outlet or skirt plated and trough of a floor mounted feeder should be approximately ‘1’ this is also applied to liner fixing bolts.

BUNKER DESIGN;-

The design of bunker out lets discharging into vibrating feeders and conveyers should incorporate the following points for maximum operational efficiency:

1. The bunker outlet should be arranged so that ,as far as possible ,none of the bunker load has to be directly supported by the feeder trough. This can be achieved by careful design of the back plate of the bunker outlet,which should extend to about a value of ‘1’of the trough bottom.

The amplitude of vibration is controlled by varying the power input to the vibrator coils by means of a thyristorised electronic controller or a rheostat or a variable transformer suitable for 415 volts, single phase 50 cycle supply.

STORAGE AND HANDLING INSTRUCTIONS:-

STORAGE:-

1. Store the machine under the cover of roof if possible or otherwise it should be necessarily coverd by tarpaulins.

2. The springs must not be taken out or loosened and the trough should not be seperated from the casting while storing or installing the equipment. However,if it is unavoidable please contact TATA-ROBINS-FRASER LTD,jamshadpur -831007.

3. Take extra care to avoid the possibility of water entering the coil & making it damp.

4. The suspension rods should be carefully stored to avoid the possibility of bending and threads being spoiled.

5. Other accessories like electronic controller or rectifier,rheostat etc.. should be kept with extreme care under the cover of roof and extra care should be taken to avoid the possibility of water entering and making the equipment damp.

6. Do not remove or loosen any bolt.

HANDLING :-

1. Avoid dragging,bumping and side jacking to prevent distortion.

2. Do not sling around springs and around the trough.

3. Do not open out or cut off any part of the feeder. The suspension rods can be opened if it is necessary.

4. Extra precautions should be taken not to disturb the position of the springs while handling or installing.

5. All the spare parts should be stored in a dry and clean area protected from the weather.

INSTALLATION

GENERAL:-

Feeders and feeder grizzlies can usually be erected in position without any dismantling of the machines being required.

If however,sight conditions make it necessery for the trough to be removed from the vibrator bracket to facilitate erection ,care should be taken to ensure that on reassembly all bolts fixing the trough to the vibrator bracket are thoroughly tightened.high strength friction grip bolts,when fitted,should be tightened in accordance with the torque values as givcen under “MAINTENANCE”.

All bolts should be further checked for tightness after a week’s operation.

If further dismantling is found to be necessary, e.g,removal of the vibrator bracket from the vibrator assembly,the advice of TRF should be obtained.

ANGLE OF INSTALLATION :-

For free –flowing materials the normal angle of installation of the feeder trough is 10 deg downhill, unless otherwise agreed or advised by TRF.

For sticky materials provision should be made to enable the angle to be increased to at least 15 deg in order to facilitate the flow of material.

SUSPENDED TYPE FEEDERS :-

Suspension rods should always be attached to a main structure.

Suspension from long un supported spans of structural steel work should be avoided as loss of effective vibration in the machine will occure if the structure is insufficiently rigid and likely to flex.

Suspension rods should be supported by a plate or bracket not less than ¾ ‘thick mounted at 90 deg to the line of the rods.

All rods should be well clear of local obstructions to allow the feeder to swing freely under working conditions. This is particularly important when rods have to pass through a concretefloor, or between parts of deep section channels.

The inclination of suspension rods will depend on the position of the support points, but they must be symmetrically inclined when viewed from the end of the feeder and vertical when viewed from the side. By splaying out the rods symmetrically excessive side movement of the feeder can be prevanted.

Each pair of rods should be evenly loaded. The loading on any rod can be adjusted by slightly lengthening or shortening the effective rod length by means of the fixing nuts or turnbuckle, if fitted.

When a feeder is suspended directly from the inclined sides of a bunker the fixing brackets must be set out sufficiently to allow adequate adjustment to be made to the suspension rod lengths should it be found necessary to alter the angle of installation of the feeder.

Each suspension rod is held bymeans of two nuts which should be located and securely locked together, on TOP of the supporting bracket or structure.

MINIMUM LONGITUDINAL AND LATERAL CLEARANCES :-

As some swinging movement of the feeder may take place under the influence of the load, particularly if this is intermittent, sufficient clearance must be provided to prevent the feeder from striking the chutes or adjcent steel work. Minimum longitudinal clearance should be ‘2’and the lateral clearance should be ‘1’approx.

FLOOR MOUNTED TYPE FEEDERS

A concrete base is recommended wherever possible but if the feeder is to be mounted on a steel structure it is essential that the members carrying the feeder are sufficiently substantial and rigid to prevent bending or whipping occurring under the effect of vibration.

Floor mounting plates with locating rings attatched are supplied for bolting down the concrete base or supporting structure to locate the rubber or coil spring absorbing feet.

Clearances between chute work ,bunker outlet or skirt plated and trough of a floor mounted feeder should be approximately ‘1’ this is also applied to liner fixing bolts.

BUNKER DESIGN;-

The design of bunker out lets discharging into vibrating feeders and conveyers should incorporate the following points for maximum operational efficiency:

1. The bunker outlet should be arranged so that ,as far as possible ,none of the bunker load has to be directly supported by the feeder trough. This can be achieved by careful design of the back plate of the bunker outlet,which should extend to about a value of ‘1’of the trough bottom.

2. Unless this done, the damping effect of the bunker load on the feeder vibration will seriously affect the feeder output.

3. Unless the depth of bed of material on the trough is adequate it is unlikely that the feeder will be able to give the required feed rate.

4. The vertical dimension of the bunker throat opening therefore must be sufficiently large to allow the correct depth of bed to be carried by the feeder. As the material tends to fall away from the top of the throat opening at the angle of rest this dimension will have to be somewhat larger than the depth of bed.

5. The correct depth of bed for the required feed rate is measured towards the discharge end of the feeder at point just before the material beings to fall away. This is usually advised at the time of quoting by TRF who will also be pleased to advise on the design of bunker openings.

6. It should also be noted that the size of throat opening may be governed the size of the maximum lump being handled.

7. A cut-off gate fitted to the bunker outlet is desirable.This will enable (a) the depth of bed to be adjusted and (b) the flow of material from the bunker to be stopped to facilitate feeder tuning and maintenance.

8. Skirt plates forming part of the bunker outlet and extending over the length of the feeder will usually have to be provided in order to contain the required depth of bed of material.The bottom edge of each skirt plate should be tapered relative to the feeder trough, and not parallel to it, so that the gap between the skit plate end the trough progressively increases towards the discharge end if the feeder.The prevents materials from getting trapped between the bottom of the skirt plate and the trough which, if it occurs, can affect feeder performance.The clearance should be sufficient to allow for the possibility of having to flatten the angle of the feeder an still to maintain the self –relieving action.

9.The bunker outlet should extend across the width of the feeder to the recommended clearance of 1” from the sides of the through.

FEEDER CONTROL

ELECTRONIC CONTROLLER:-

Presently TRF Electromagnetic Feeders are fitted with ELECTRONIC CONTROLLERS housed in a sheet steel enclosure, which is suitable for wall mounting and is off dust proof construction. The unit consists of a rotary ON/OFF switch , protective fuses, potentiometer, thyristor, indicating meters and lamps, flush mounted on the front door. The other components are mounted inside the enclosure suitably designed to allow for air circulation to enable the generated heat to be dissipated away. Unless otherwise specified, the controller is suitable for operating on 415 volts , single phase 50 c/s. AC supply system and the DC output can be varied from ‘0’ TO 100% of the rated value.

Power input for electromagnetic feeder is controlled by varying the input voltage or current. Each thyristor combines the functions of rectifying the AC supply and controlling power output. Thyristor is a current controlled silicon rectified.

With an AC voltage between the anode and cathode of a thyristor which is in triggered state, current will flow during each positive half cycle, the output being a series of uni-directional power impulses which are fed to the coil of the electromagnetic feeder.

Triggering impulses are produced by a simple DC voltage. The level of this control voltage determines the point in each positive half cycle at which the conduction is initiated. If a thyristor is triggered at the beginning of each positive half cycle, maximum power is available. As the triggring point is moved towards the end of half cycle by varying the DC control voltage the power available is progressively reduced.

Hence, the amplitude of the vibration of the electromagnetic vibrator can be closely controlled simply by adjusting the control voltage.

LOCATION OF CONTROLLER:-

Wherever possible the controller is located adjacent to the feeder as this allows the operator to observe the effect of adjustment on the feeder discharge rate and also will facilitate maintenance and tuning adjustments.

Where site requirements dictate the positioning of the control equipment at a central point, adjustment of feeder discharge rate, local to the feeder may be done by the provision of a remote control station. In common with other electrical, apparatus the controller must be protected from damp and in out door locations

THE FOLLOWING STEPS ARE RECOMMENDED TO BE FOLLOWED FOR INSTALLATION OF THE CONTROLLER UNITS:-

(a) After termination and glanding of the supply cable ensure that the glanding is proper so that no clearance exists between the cable and gland.

(b) Connect the outgoing cable also and ensure proper glanding as mentioned above.

(c) Connect the outgoing cable from the controller unit to the feeder coil wires.(d) Ensure that allinstallations are carried out as per statutory regulations.

Having completed installation the following steps may be taken for commissioning:

1. Select the potentiometer for the ‘Low’ position.2. The controller is now ready for being switched on.3. The main switch may be now be brought to the ON position and the following should be

checked:(a) Glowing of indicating lamp.(b) Reading of Ampere meter (This should be ‘O’ corresponding to the minimum setting

of the potentiometer).4. Now increase the potentiometer gradually and observe the deflection in the ampere meter,

which should go on increasing steadily.5. Now try to change the potentiometer settings a few times bringing it from high to low

position alternately.It will be noted that the vibrations will also fluctuate in the same manner.

6. In case the above variations in the vibrations are consistent with the variation of controller knob, than set the potentiometer at the desired level for required output.

CONVENTIONAL CONTROLLER ARRAMENGEMENT WITH RECTIFIER AND RHEOSTAT:-

WIRING:-

The wiring diagram shows the basic series circuit consisting Rheostat and Rectifier. One wire from the switch fuse goes via Rheostat to one of the Vibrator coil (s) leads, and the other wire from the switch fuse directly to the other Vibrator coil (s) leads.

RECTIFIER:

The rectifier must be mounted with the cooling fins vertical to ensure adequate ventilation.

In common with other electrical apparatus the rectifier must be protected from damp and in outdoor situations should be protected from the weather by a suitable shroud or weather – proof cubicle

A free passage of air round the rectifier is essential and it should not therefore be mounted in a cupboard or other enclosed place.

For wall mounting type of rectifiers, spacers are provided to enable the case to be fixed clear of the wall to ensure a free all-round passage of air.

The rectifier must not be mounted directly above the Rheostat, or other source of heat.

RHEOSTAT:-

The Rheostat is included in the circuit for the purpose of increasing or decreasing the amplitude of vibration and hence the feed rate.

It should be located, if possible, near the feeder to enable the operator to observe the effect of Rheostat adjustment on the feed-rate, and also to facilitate the tuning procedure.

FLAP OPERATED SWITCH:-

The takes the form of a of load operated flap switch witch is mounted upon the face of the bunker outlet and which has a snap lock switch connected into the controller or supply line to the feeder.This enables a feeder to be stopped automatically, started or run at a fixed reduced discharge rate according to the depth of material present in the feeder trough.

Typical applications of this switch are:-

To disconnect the feeder or to run it at reduced amplitude when the bunker becomes empty.This will prevent damage which may occur if the feeder is allowed to run for a long period at high amplitude without load.

To maintain a bed of material in feeder so that uncontrolled flushing of material over the feeder is prevented when the refilling of an empty bunker is started. This is particularly necessary for a ground hopper feeder in a Wagon –tippler installation.

CLEARANCE:-

Adequate clearance must be provided about the feeder so that all parts are accessible. This is Particularly important at the back of the feeder where the clearance should be sufficient to allow the spring bolts to be removed.

OPERATION:-

Variation to the discharge rate of a feeder must be achieved by use of the control unit provide. When a gate is fitted to the bunker this should be opened sufficiently for the feeder to draw the requisite depth of bed of material for the output. Under no circumstances should the feeder be run at maximum amplitude and the discharge rate adjusted by opening or closing the gate.

APPLICATIONS OF VIBRO FEEDER:-

1. This vibro feeders are being used in LD converters for required amount of materials used are coke, dolomite, lime stone, dolo chips, iron ore etc.

2. Vibro feeders also being used in calcining plants for the chemical requirements in plant acquisitions.

3. in general we see these in filling of urea bags certain amount of weight is filled it completes closing same in case of rice bags that we generally use in our daily life.

4. SINTER PLANT and RMHP are department which are in use of these vibro feeders.

ADVANTAGES:-

1. Vibro feeders are meant to be in the automatic system process to fulfill the requirement of the needed for large machines.

2. These are having machine made systems manual usage will be difficult as well as risky so more machines are used in this vibro feeder in steel plant.

3. More time is being saved because machines are replaced by man and operations which are done in larger system is made easy.

DISADVANTAGES:-

1.Protection is less and if damage occurs we have to check for this problem in all entire machines.

2.More health problems are occurred at these working places. This is the main disadvantage.

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vibro feeders

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