(57) A crushing plant, comprising a cage (2) containing a hammer rotor (3) and presenting
a loading mouth (22) connected to a system for the supply of loose material (5) to
be crushed, said system comprising a service corridor provided with an arrival hopper
for the material to be crushed, and means for advancing the material along the corridor
with stepwise movement, the downstream end of said corridor being upperly open, and
within it there being slidingly positioned a compactor member (8) arranged to vary
its level, in synchronism with the stepwise movement, between a raised rest position
in which it guides the material lying within the corridor, and a lowered working position
in which it presses the temporarily stationary material against the base of the corridor,
before being thrust into the cage containing the rotor.
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