Komatsu GALEO BR550JG-1, Operation & Maintenance Manual

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OPERATION
OPERATION
EFFICIENT USE OF JAW CRUSHER
PRINCIPLE OF CRUSHER OPERATION
The swing jaw makes a circular motion at contact point (1), but it
makes a long and thin elliptical motion at points closer to contact
point (3) owing to the eccentric crankshaft and a swing motion of
the toggle plate.
The swing jaw plate fixed to the swing jaw repeats the above
mentioned motion against the fixed jaw plate. Hence the debris fed
into the crusher chamber are subjected to the more compression
force, as they go down, and eventually crushed.
The toggle plate has such a function that, when some uncrushable
material like an iron lump is fed into the crusher chamber, it
deforms itself to shield the shafts and the bearings from a large
impact load.
The clearance between the fixed jaw plate and the swing jaw plate
can be adjusted by changing a combination of set shims to change
the size of crushed debris.
Both fixed jaw plate and swing jaw plate are reversible, so when
worn out, use them for once by turning them vertically.
Service life of the fixed jaw plate and swing jaw plate can greatly
change depending on debris and operating conditions. Generally
it can be shortened when fed with debris containing a large amount
of soils and water, and when the outlet clearance is narrowed.
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