Jaw crusher

Jaw Crusher

1. Jaw Crusher

2. Crusher
Crusher is size reduction equipment
Acrusheris amachinedesigned to reduce
largerocksinto smaller, more manageable particles
Crusher is a machine which is used to crush heavy size
particle into small size, also it’s a primary size reducer
Crusher are low speed machine for coarse reduction of
large particles
Approx. size of reduced of material from a crusher ranges
from 150mm to 250 mm

3. Working Principle Of Crusher
A crusher uses compressive force for breaking of
particle
This mechanical pressure is achieved by the two
jaws, one jaw is kept stationary and is called a fixed
jaw while the other jaw, called a swing jaw, moves
back and forth relative to it

5. Types Of Crushers
Jaw crushers
Gyratory crushers
Differencebetweenthesejawcrushersisthefeedrateand
productrateanddesign,weare,however,goingtotalk
aboutjawcrushersinthisparticularpresentation

6. Jaw Crusher
Jawcrusherisatypeofcrusherwhichproduces
coarseparticle
Feedsizeofthejawcrusheris1500mm-40mmand
theproductsizeisfrom50mm-5mm
Compressivestrengthofjawcrushersis320mega
Pascal
Rpmforjawcrusherisbetween200-400

7. Jaw Crushers
Jawcrushersareheavydutymachinesandhence
needtoberobustlyconstructed
Theouterframeisgenerallymadeofcastironor
steel
Thejawsthemselvesareusuallyconstructedfrom
caststeel
Theyarefittedwithreplaceablelinerswhichare
madeofmanganesesteel

8. Figure 1

9. Working Principle Of Jaw Crusher
Ajawcrusherusescompressiveforceforbreakingof
particle.
AJawCrusherreduceslargesizerocksororeby
placingtherockintocompression.Afixedjaw,
mountedina"V"alignmentisthestationary
breakingsurface,whilethemovablejawexertsforce
ontherockbyforcingitagainstthestationaryplate

11. Working Principle
Thespaceatthebottomofthe"V"alignedjawplates
isthecrusherproductsizegap,orthesizeofthe
crushedproductfromthejawcrusher.Therock
remainsinthejawsuntilitissmallenoughtopass
throughthegapatthebottomofthejaws

13. Jaw Crusher
Thevolumeorcavitybetweenthetwojawsiscalled
thecrushingchamber
Themovementoftheswingjawcanbequitesmall,
sincecompletecrushingisnotperformedinone
stroke
Theinertiarequiredtocrushthematerialis
providedbyaweightedflywheelthatmovesashaft
creatinganeccentricmotionthatcausestheclosing
ofthegap.

14. Jaw Crusher
Anglebetweentwojawsisbetween20-30degree
Largerlumpscaughtbetweenupperpartofthejaw
andbrokenintosmallpiecebyimpactforce
Smallpiecescometonarrowerspaceatthebottom
wherecompressiveforcedoasufficientsize
reductionandproductobtained

15. Types Of Jaw Crusher
Jawcrusherisclassifiedintotwotypes
1-BlakeJawcrusher
2-Dodgejawcrushers
Both Crushers employs a compressive force for size
reduction

16. BLAKE JAW CRUSHER DODGE JAW CRUSHER
In Blake jaw
crusher, the swing
jaw is pivoted at
upper position, the
greatest amount of
motion is at the
bottom which
means less choking
In dodge jaw
crusher, the swing
jaw is pivoted at
bottom position, it
has a greater
tendency to choke
DIFFERERNCE

17. Blake Jaw Crusher
The Blake type jaw crusher has a fixed feed area and
a variable discharge area
Greatest amount of motion is at the bottom of v
which means that it have a little tendency to chock

19. Single Toggle Jaw Crusher
In the single toggle jaw crushers, the swing jaw is
suspended on the eccentric shaft which leads to a
much more compact design than that of the double
toggle jaw crusher
The swing jaw, suspended on the eccentric,
undergoes two types of motion-swing motion
towards the fixed jaw due to the action of toggle plate
and vertical movement due the rotation of the
eccentric

20. Single Toggle Jaw Crusher
These both motions, when combined, lead to an
elliptical jaw motion. This motion is useful as it
assists in pushing the particles through the crushing
chamber
This phenomena leads to higher capacity of the
single toggle jaw crushers but it also results in higher
wear of the crushing jaws
These type of jaw crushers are preferred for the
crushing of softer particles

21. Double Toggle Jaw Crushers
In the double toggle jaw crushers, the oscillating
motion of the swing jaw is caused by the vertical
motion of the pitman.
The pitman moves up and down. The swing jaw
closes, it moves towards the fixed jaw when the
pitman moves upward and opens during the
downward motion of the pitman.
This type is commonly used in mines due to its
ability to crush tough and abrasive materials.

22. Dodge Jaw Crusher
In the Dodge type jaw crushers, the jaws are farther
apart at the top than at the bottom
which form a tapered chute so that the material is
crushed progressively smaller and smaller as it
travels downward until it is small enough to escape
from the bottom opening

23. Dodge Jaw Crusher
Greatest amount of motion is at the top of V which
leads to chocking
The Dodge jaw crusher has a variable feed area and
a fixed discharge area which leads to choking of the
crusher
used only for laboratory purposes and not for heavy
duty operations.

24. figure

25. Advantages Of Jaw Crushers
oSimpleconstructionmakesforeasymaintenance
oStableperformance
oHighcrushingratio
oLowoperationalcost
oHighcapacity
oAdjustabledischargeport

26. Industrial Applications
Crushersareused
Heavydutymining
Cementindustry
Fertilizersindustry
PlasterofParisPlant
Animal (Cattle) Feed plants
Herbal plants
Cement plants
Ceramic Plant

27. Industrial Applications
Coconut Shell Plant
Salt Plant
Mines and Minerals
Agro Based industries
Others where size reduction required

28. Gyratory crushers
Gyratory crusher looked like a jaw crusher with
circular jaws between which material is being
crushed some point all the time
Rpm is 125-425 gyration per minute
Give a continuous discharge because some part of
the crushing head working all the time
Produces up to 4500 ton per hour of material being
crushed

29. Gyratory crushers
A gyratory crusher is similar in basic concept to a jaw
crusher, consisting of a concave surface and a conical
head; both surfaces are typically lined with
manganese steel surfaces.
The inner cone has a slight circular movement, but
does not rotate; the movement is generated by
aneccentricarrangement.

30. Gyratory crushers
As with the jaw crusher, material travels downward
between the two surfaces being progressively
crushed until it is small enough to fall out through
the gap between the two surfaces.