INSTRUCTION MANUAL.
JAW CRUSHER SET UP DESCRIPTION SPECIFICATIONS INSTALLATION
REQUIREMENTS INSTALLATION AND CONNECTIONS PRECAUTIONS TROUBLE
SHOOTING
EXPREMENTATION WORKING PRINCIPLE AIM PROCEDURE OBSERVATION TABLE
CALCULATIONS REASULTS
SET UPDESCRIPTION:Jaw crusher is primary crushing equipment used
for crushing of materials.Blake type crusher, with movable jaw
pivoted at top, giving greatest movement to small lumps. This type
of crusher has a movable crushing plate, usually corrugated, fixed
in a vertical position. Eccentric mechanism is used to move jaw in
a reciprocating motion.SPECIFICATIONS:JAW SIZE 100 mm X 180 mm
approx.Motor: 3 HP.V belts: 2nos. BINSTALLATION: Cement foundation
of size 1500 mm X 700 mm X 300 mm ht. (150 mm in
ground)CONNECTIONS:3 phase electric supply with 3 phase
DP.PRECAUTIONS: Lumps to be crushed should be, not more than size
of 70 mm. Material to be crushed should be dry enough to flow down.
Wet material may stick to jaw and may block equipment. Feed
material slowly so that it should pass down. Energy meter must be
installed properly, so that its rotating wheel rotates
properly.TROUBLESHOOTING: NOISE: check oil. Chocking: remove
material manually using a scrapper. Belt slip: pull motor back so
that belts should tight. OILING: once in a week oil 20W/40.
WORKING PRINCIPLE:Jaw crusher is reduction equipment also called
as impact braker. This particular type of Jaw crusher is eccentric
jaw crusher having swinging jaw mounted Backward as well as forward
motion. The upper and swing jaw is held in position against toggle
by bush, Greater wear caused by this motion and direct transmittal
of shocks to the bearing limit its use to readily breakable
material. However a large reduction ratio useful for simplified low
tonnage circulate with fewer grinding steps is possible.
AIM:1. Rittingers law constant2. Bonds law constant3. Kicks law
constant & to plot size distribution of the material
crushed.
PROCEDURE:1. Take 20 kg. Of feed.2. Note the initial size of
feed.3. Switch on jaw crusher and note down the time required for
one revolution of energy meter under no load condition OR no. of
revolutions in fixed time intervals.4. Charge jaw crusher with
feed.5. Note down time required for one revolution of energy meter
under load condition.6. Note down time required for crushing of
sample.7. Collect sample and screen it.
EQUIPMENT :-Jaw crusher, energy meter, stop watch, standard
sieves, weight balance,container disc etc.MATERIAL :-Coal,Bricks or
gravel ( Sample size may be 2 to 3 inch)THEORY :-The energy
required for size reduction is given by dE/dD = C.Dn.Where, dE=
Energy required to effect a change dD in the size of unit mass of
materialn = Exponent,C = constant. Given in databook for different
materials.
1. Rittingers law :E2 E1 = E = .(1)Where, KR = Rittingers
constantDsa & Dsb = Volume surface mean diameterM = Mass feed
rate for crushingE = Total energy required for crushing.
2. Kicks law :E2 E1 = E = .(2)Dsa/Dsb = Size reduction ratioKk =
Kicks law constant.
3. Bonds law :(3)
Where, P = Power required for crushing in KWm = Tones of feed in
one hour of grinding time(Feed rate in tons/hour)Dsa & Dsb=
Diameters of sieves through which 80% of the feed & product
pass respectively in mm.Wi = Work index in KWh/tones {or
KW/(tons/hr)}PROCEDURE :-1. Run the jaw crusher with no load.
Determine the time required tocomplete one revolution of energy
meter disc(or the time required toconsume 1 unit of electrical
energy), for energy calculation.2. Feed 1000 gm of coal or gravel
slowly into the crusher (sample of size may be +4 to -2 mesh) &
note down the power consumption under crushing condition of jaw
crusher, by noting the time required for one revolution of energy
meter disc, with the help of stop watch.3. Also note down the total
time of crushing.4. Do the sieve analysis of the crushed
material.
RESULT:-1. Rittingers constant KR =2. Bonds constant KB =3.
Kicks law constant KK =INDUSTRIAL APPLICATION :-It is used in
industry to crush big lumps into coarse particles.OBSERVATION :-1.
Energy meter constant NR =_________________Revolution/kwh2. Time
required for one revolution of energy meter disc, when crusher
runsWithout load t0=___________sec.3. Time required for one
revolution of energy meter disc, when crusher runsWith load tL
=___________sec.4. Total revolutions of energy meter disc, when
crusher runs with loadNRL= T/tL= __________5. Quantity of material
Fed F = _____________Tons6. Feed time tF= ___________sec7. Total
mass of product = ___________kg8. Average Feed size of material Dsa
=______________9. Total crushing time T =________________sec10.
Average size of crushed product Dsb= ____________11. Total
revolutions of energy meter disc, if crusher runs without loadNR0 =
T/t0 = __________12. Wi = Work index in KWh/tones {or
KW/(tons/hr)}= __________(From reference book)OBSERVATION TABLE
:
Crushed Product Analysis:-Sr.No
MeshNo.
ClearOpeningin mmDpi
Differentialmassretained
Cumulativemassretained
DifferentialmassfractionsXi
Cumulativemassfractionsmm-1
CALCULATIONS :
(1) Average size of feed (Find it by visual inspection) Dsa=
___________mm(2) Average size of the crushed product Dsb :Volume
surface mean diameter is given by
Also Plot the graph of Xi Vs (1/Dpi), and calculate Dsb(3) Total
Electrical Energy consumed during crushing = (4) P/m = kwh/tons =
(NRL-NR0)/NR Kwh=(5) Now calculate :1. Rittingers law constant KR2.
Bonds law constant KB3. Kicks law constant KKUsing Eqn. 1, 2, 3
