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The cone crusher is a modified gyratory crusher.
The essential difference is that the shorter spindle
Crushers. Cross-section of heavy-duty Symons cone crusher
of the cone crusher is not suspended, as in the gyratory,
but is supported in a curved, universal beating
below the gyratory head or cone.
Power is transmitted from the source to the
countershaft through a V-belt or direct drive. The
countershaft has a bevel pinion pressed and keyed
to it, and drives the gear on the eccentric assembly.
The eccentric has a tapered, offset bore and provides
the means whereby the head and main shaft follow
an eccentric path during each cycle of rotation.
Since a large gape is not required, the crushing
shell or "bowl" flares outwards which allows for
the swell of broken ore by providing an increasing
cross-sectional area towards the discharge end.
The cone crusher is therefore an excellent arrested
crusher. The flare of the bowl allows a much greater
head angle than in the gyratory crusher, while
retaining the same angle between the crushing
members. This gives the cone crusher Head and shell shapes of (a) gyratory,and (b)cone crushers a high capacity, since the capacity of gyratory
crushers is roughly proportional to the diameter of
the head.The head is protected by a replaceable mantle,
which is held in place by a large locking nut
threaded onto a collar bolted on the top of the head.
The mantle is backed with plastic cement, or zinc,
or more recently with an epoxy resin.
Unlike a gyratory crusher, which is identified
by the dimensions of the feed opening and the
mantle diameter, a cone crusher is rated by the
diameter of the cone lining. Cone crushers range
in size from 559mm to 3.1 m and have capacities
up to 1100 t h -1 with a discharge setting of 19 mm,
although two 3.1 m Symons cone crushers, each
with capacities of 3000t h -1, have been installed in
a South African iron-ore plant (White, 1976).
The throw of cone crushers can be up to five
times that of primary crushers, which must withstand
heavier working stresses. They are also operated
at much higher speeds. The material passing
through the crusher is subjected to a series of
hammer-like blows rather than being gradually
compressed as by the slowly moving head of the
The high-speed action allows particles to flow
freely through the crusher, and the wide travel of
the head creates a large opening between it and the
bowl when in the fully open position. This permits
the crushed fines to be rapidly discharged, making
room for additional feed.
The fast discharge and non-choking characteristics
of the cone crusher allow a reduction ratio in the
range 3-7:1, but this can be higher in some cases.
Detailed description of the working is provided in the book:
Mineral Processing Technology
An Introduction to the Practical Aspects of Ore Treatment and Mineral
Recovery, by Barry A. Wills, Tim Napier-Munn
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