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JAW CRUSHER

GROUP A3


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CONTENTS

JAW CRUSHER

TYPES OF JAW CRUSHERS

PRINCIPLE AND WORKING OF JAW CRUSHER

EQUIPMENT DIAGRAM

INDUSTRIAL APPLICATION AND FEATURES OFJAW CRUSHER

PROCEDURE

OBSERVATION AND CALCULATION

RESULTS AND DISCUSSION

LIMITATION

REFERENCES


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JAW CRUSHER

A jaw or toggle crusher consists of a set of

vertical jaws, one jaw being fixed and the

other being moved back and forth relative to

it by a camor pitmanmechanism. The jawsare farther apart at the top than at the

bottom, forming a tapered chute so that the

material is crushed progressively smaller

and smaller as it travels downward until it issmall enough to escape from the bottom

opening.
http://en.wikipedia.org/wiki/Camhttp://en.wikipedia.org/wiki/Connecting_rodhttp://en.wikipedia.org/wiki/Connecting_rodhttp://en.wikipedia.org/wiki/Cam


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TYPES OF JAW CRUSHERS

Blake jaw crusher Dodge jaw crusher

In the Blake or jaw

crusher the

moveable jaw ispivoted at top. The

greatest amount of

motion is at the

bottom whichmeans it has the

little tendency to

choke

In the dodge jaw

crusher the moving

jaw is pivoted at thebottom. As minimum

movement is at the

bottom it has a

greater tendency tochoke.


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Equipment diagrams

DODGE JAW CRUSHER BLAKE JAW CRUSHER


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PRINCIPLE OF JAW CRUSHER

This jaw crusher uses motor as itspower. Through the motor's wheels, theeccentric shaft is driven by the triangle

belt and slot wheel to make themovable jaw plate move by a regulatedtrack. Therefore, the materials in thecrushing cavity composed of fixed jaw

plate, movable jaw plate and side-leeboard can be crushed and dischargedthrough the discharging opening.


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WORKING OF JAW

CRUSHER


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INDUSTERIAL APPLICATIONS

Jaw Crusher can be used in mining,

metallurgical industry, construction, road

and railway building, chemistry etc.


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FEATURES OF JAW

CRUSHER

Simple structure easy maintenance.

Stable performance.

Even final particles and high crushingratio.


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Procedure

Prepare 5 kg of the size that can pass through

3in hole and retain on a 2 in hole. Note down time (t1) required for 2 revolutions

under unloaded conditions. Also note downenergy meter factor.

While crushing note down the time(t2) requiredfor 2 revolutions under loaded conditions.

when crushing is completed, stop the stopwatchand turn off the crusher. Note down total timerequired for crushing .

Analyze the material using different us astmmesh sieves and weigh out the mass retained

on each sieve and in the pan.


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TO Report the energy required to crushing a

given feed using jaw crusher.

Total weight of feed taken= 5kgNumber of revolutions for unloaded conditions=2

Time elapsed for n1 revolutions=t1=120s

Number of revolutions for loaded conditions =2

Time elapsed for loaded conditions=t2=110s

Energy meter factor=N=120

Total time for crushing=T=360s

ENERGY FOR CRUSHING :

E=(n2/t2-n1/t1)*T*1000/N*W=0.90 KWh/ton

TOTAL ENEGY FOR CRUSHING

E=n2/t2*T*1000/N*W= 10.9 KWh/ton

FRACTIONAL AND CUMULATIVE DISTRIBUTION


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FRACTIONAL AND CUMULATIVE DISTRIBUTIONPLOTS

us Astm

mesh

weight

retai

ned

W

(g)

average

particle

size

d(um) weight ratio

stated

particle

size (um)

cumulative

fraction

-1+2 25 5600 0.004527822 25600 0.00452782

-2+4 169 5180 0.030608074 5600 0.99547212

-4+10 241 3380 0.0436482 4760 0.96486405

-10+20 943 1420 0.170789429 2000 0.92121585

-20+30 1330 715 0.240880107 840 0.75042642

-30+40 1257.62 505 0.227771158 590 0.50954631

-40+50 880.8 358.5 0.159524209 420 0.28177515

-50+70 411.6287 253.5 0.074551252 297 0.12225094

-70+100 247.65 180 0.0448526 210 0.04769969

-100+PAN 15.72 150 0.002847094 150 0.00284709


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Graphical representation

fractional distribution curve

0

0.05

0.1

0.15

0.2

0.25

0.3

5600 5180 3380 1420 715 505 359 254 180 150

average particle size(um)

weightfraction

Series1

cumulative distribution plot

0

0.2

0.4

0.6

0.8

1

1.2

25600

5600

4760

2000

840

590

420

297

210

150

stated particle size(um)

cumulativefractionless

thanstated

size

Series1

Fractional distribution plot

Cumulative fraction plot


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Measurement of average diameters

US

ASTM

Weight

retained

w

Average

Paricle

size

d(um)

Weight

ratio

X xd x/d x/d2 x/d3

-1+2 25 5600 0.004527822 25.3558 8.0854E-07 1.44382E-10 2.57825E-14

-2+4 169 5180

0.0306080

74 158.5498

5.9089E-

06

1.14071E

-09

2.20215E

-13

-4+10 241 3380 0.0436482 147.5309

1.2914E-

05

3.82061E

-09

1.13036E

-12

-10+20 943 1420

0.1707894

29 242.521

0.00012

027

8.47002E

-08

5.9648E-

11

-20+30 1330 715

0.2408801

07 172.2293

0.00033

69

4.71182E

-07

6.58996E

-10

-30+40 1257.62 505

0.2277711

58 115.0244

0.00045

103

8.93133E

-07

1.76858E

-09

-40+50 880.8 358.5

0.1595242

09 57.18943

0.00044

498

1.24122E

-06

3.46226E

-09

-50+70 411.6287 253.5 0.074551252 18.89874 0.00029409 1.16011E-06 4.57637E-09

70+100 247.65 180 0.0448526 8.073468

0.00024

918

1.38434E

-06

7.69078E

-09

100+pa

n 15.72 150

0.0028470

94 0.427064

1.8981E-

05

1.26538E

-07

8.43583E

-10

w=5521.41

87

xi di =

945.7999

xi/di=

0.00193

506

xi/di2=

5.36633E

-06

xi/di3=

1.90616E

-08


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diameters results

Weight Mean Diameter:dv=xi di=1085.208 um=0.0427 in

Surface Mean Diameter:ds = 1/xi/di=490.1 in=1.2448*10^7 um

Length Mean Diamter:dl=xi/di/xi/di2=275.7 um=0.01086 in

Mean Volume Diameter:dv=(1/xi/di3)^1/3=320.3 um=0.01036 in


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Limitations

Alternative method for calculating of

energy cannot be applied because of old

and defective meters.

Practical is time consuming because of

lack of electricity.


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References

www.en.wikipedia.org/wiki/Crusher

www.shibangchina.com/info/JawCrusher

RICHORDSON AND COULSON VOLUME2
http://www.en.wikipedia.org/wiki/Crusherhttp://www.shibangchina.com/info/JawCrusherhttp://www.shibangchina.com/info/JawCrusherhttp://www.en.wikipedia.org/wiki/Crusher


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