Metso MP1000, Technical Reference Manual

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SECTION 1 - GENERAL CRUSHER INFORMATION
1-2
MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
Feed Opening (Closed Side) — The smallest
distance between the top of the crushing members
as measured when the two crushing members are at
their closest relationship during their gyrating
cycle.
Feed Opening (Closed Side) — Determines the
maximum size of feed. As a general rule, the
maximum size of feed should not exceed the closed
side feed opening.
Feed Opening (Open Side) — The largest distance
between the top of the crushing members as
measured when the two crushing members are at
their farthest relationship during their gyrating
cycle.
Discharge Setting — The distance between the
bottom of the crushing members as measured at the
point where the two crushing members are at their
closest relationship during their gyrating cycle.
This discharge setting regulates product size.
Minimum Discharge Setting — The smallest
permissible distance between the bottom of the
crushing members as measured when the two
crushing members are at their closest relationship
during the gyrating cycle.
Discharge Opening — The distance between the
bottom of the crushing members as measured at the
point where the two crushing members are at their
farthest relationship during their gyrating cycle.
This wide opening permits rapid discharge of the
crushed material.
Feed Size — Is equal to the square opening of wire
cloth through which the material can pass.
Product Size — The size equal to the square
opening of wire cloth through which the material
can pass after it has been crushed.
Capacity — The output of the Crusher computed
in tons per hour.
Open Circuit Operation — The type of operation
where precise uniformity of product size is not
considered to be of prime importance and the feed
is run through the Crusher but once.
Closed Circuit Operation — The type of
operation where precise uniformity of product size
is important and the product is screened after
passing through the Crusher and the material which
does not pass through the screen is returned to the
Crusher.
1.6 Optimizing Crusher Capacity
The Crusher is one component of the circuit. As
such, its performance is in part dependent on the
proper selection and operation of feeders,
conveyors, screens, supporting structure, electric
motors, drive components and surge bins. Where
used, attention to the following factors will enhance
crusher capacity and performance.
•
proper selection of crushing chamber for
material to be crushed
• a feed grading containing proper distribution of
the particle sizes
• controlled feed rate
• proper feed distribution 360° around the
crushing chamber
• discharge conveyor sized to carry maximum
crusher capacity
• properly sized scalping and closed circuit
screens
• automation controls
• adequate crusher discharge area
The following factors will detract from crusher
performance.
•
sticky material in crusher feed
• fines in crusher feed (smaller than crusher
setting) exceeding 10% of crusher capacity
• excessive feed moisture
• feed segregation in crushing cavity
• improper feed distribution around
circumference of crushing capacity
• lack of feed control
• inefficient use of recommended connected
horsepower
• insufficient conveyor capacity
• insufficient scalper and closed circuit screen
capacities
Example
A 50 mm (2") feed size is any material which can
pass through a screen that has 50 mm (2") wire cloth.