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WORKING OF JAW CRUSHER
Crushing is managed by pulping or material by
law plates dully placed at due angle for maximum output
and minimum consumption of power and exerting
appropriate thrust on the crushing zone as well on the
whole body. The basic thrust is obtained
 by the
eccentric movement of pitman which is transferred to
lever with the help of rear and front toggle plates
connect the pitman with lever and toggle block. The
lever consists of one jaw plate (moving) which exerts
the thrust on the other jaw plate (fixed) on the body.
This thrust crusher the material between the jaw plates.
Then crusher material travels down ward by gravity and
falls on the discharge chutes. The sizes of products can
be adjusted by cutting or increasing the toggle plates
and lowering the wedge blocks.
STANDARD SPECIFICATION:
STEEL BODY : The body
of jaw crusher is fabricated from prime quality M.S
Plates and reinforced by Co2 Mig welding process. The
body is so fabricated to ensure that it is capable of
enduring stress and crushing load developed during
continuous crushing.
SWING LEVER : Lever
is also fabricated from M.S plates and welded with Mig
welding process. The hinge pin is fitted in lever and
pivoted at both the ends with taper bush.
PITMAN : Pitman is
fabricated from M.S plates by Mig welding process. The
pitman is machined and four bearing is mounted eccentric
shaft. The two bearing are fitted inside the pitman and
two bearing are fitted outside the pitman in C.I.
Brackets on eccentric shaft. The provision for grease
lubrication system is made on the top of pitman.
ECCENTRIC SHAFT :
The eccentric shaft is machined out of special steel and
due eccentric is maintained and fitted in the centre of
pitman with four self aligned double roller spherical
bearing of high capacity ensuring smooth running.
JAW PLATES : Jaw
Plates are made of high quality manganese steel casting
containing 12 to 14% Manganese. Two jaw plates is used,
one is fixed and another is moving. These plates can be
reserved end to obtained maximum life of each jaw
plates.
FLY WHEELS : Fly
wheels are of high grade cast iron, machined all over,
properly balanced and fitted on the end of the cranks
shaft. One Fly wheels is V-grooned for V- Belts
 and
another is flat. These wheels can be inter changed from
side to side. Fly wheels ensure steady crushing force,
giving control to unsymmetrical force.
TOGGLE BEARINGS :
Toggle bearing are made from M.s Square Bars or casted
in manganese steel. Four Toggle Bearing required in a
jaw Crusher.
TOGGLE PLATES : The
toggle plates are fabricated from M.S plates and well
designed for correct jaw movement. The toggle bearing
serves as safeguard in case of uncrushed materials
enters between the jaw plates. The Toggle plates get
broken saving the breakage of other parts like bearing,
Crank shaft etc.
TOGGLE BLOCK AND WEDGE BLOCKS :
Toggle and wedge Blocks is also machined out of high
grade cast iron. These are fitted n the rear portion of
jaw body to control the thrust in that direction.
LUBRICATION : Grease
nipples are approved on the upper position of the pitman
and brackets. Two holes are provided on the upper of the
lever for oiling. Oiling and greasing shall be done
after every 7 days in the machine for longer life of the
bearings.
PULL BACK ROD AND SPRING :
To keep the both the toggle plates in their
assembly position and pull back the lever, sturdy design
of pull back rod along with quality steel spring are
provided.
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Remarks :
- The average weight of hard sock is taken as l00
lbs/cuft. Or l430kg/m3.
- Machine should be greased and oiling at regular
intervals.
- Normally the size of stone to be feeded is taken
as 2” less than the width of machine nominated in
the catalogue. In case of bigger size crusher, this
figure goes up to 4”.
- The ideal ratio of jaw opening to the feed size
is I:8.
- The power requirement may vary as per the
hardness / quality of the rock to be crushed.
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PARTS LIST :
- Main Body
- Liver Pin
- Jaw stock (Lever)
- Jaw Plates (Reversible)
- Toggle Bearing
- Toggle Plates
- Fixed Plate (Reversible)
- Slide Plate
- Fly wheel (Flat)
- Brackets cover
- Bearing Brackets
- Eccentric shaft
- Pitman fitted roll brg.
- Fly wheel (V-grove)
- Pull back rod
- Spring
- Washer
- Fly Nut
- Wedge block & Toggle Block
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