Komatsu Galeo BR380JG-1E0 Shop Manual page 189

SEN01354-00
Principle of crushing
With the movement of swing jaw (1), contact
q
(a) caused by the eccentricity of crankshaft (2)
and the rocking motion of toggle plate (3)
moves in a circle. The closer it comes to con-
tact (c), the more it moves in a narrow oval
movement.
Movable jaw plate (5) installed to swing jaw (1)
q
repeat the movement in Step 1 against fixed
jaw plate (4). As a result, the rock or rubble
loaded into crushing chamber (6) moves to the
bottom of the crushing chamber, is subjected
to a powerful compression force, and is
crushed.
If lumps of metal or other hard substances that
q
cannot be crushed are loaded inside crushing
chamber (6), toggle plate (3) functions to auto-
matically change shape and protect the bear-
ing of crankshaft (2) from any big impact load.
The clearance of the discharged port of fixed
q
jaw plate (4) and movable jaw plate (5) can be
adjusted by changing the combination of shim
plates, so it is possible to change the particle
size of the crushed material.
When fixed jaw plate (4) and movable jaw
q
plate (5) become worn, it is possible to reverse
the top and bottom. This operation can be car-
ried out once only.
The wear of fixed jaw plate (4) and movable
q
jaw plate (5) differs according to the conditions
and the material being crushed, but generally
speaking, these parts wear more rapidly if the
crushed material includes large amounts of
sand or moisture. The speed of wear also
increases if the clearance at the discharge port
is made small.
12
10 Structure, function and maintenance standard
BR380JG-1E0