When oversized rock
is introduced into the
jaw, but is too large to
fit into the chamber, it
creates an interruption
in crushing, which equals
no production. Presizing material is vital
to providing the proper
feed and achieving high
ing chamber, up to five times the normal crushing forces. As with
any force that is generated, the energy must find a point of release,
which is usually in the jaw base structure or in the shaft and bearings. Over time, this can cause damage, Lippert says. Excessive
amounts of fine material also limit production because these fines
are taking the place of otherwise crushable larger rock.
Compaction can also be caused by improper use of the jaw die
or plates. The corrugations of the jaw dies are crucial to the jaw
performance, as the corrugations provide the expansion room
needed as well as the leverage required to break the rock. Jaw dies
should be flipped or replaced once the remaining corrugations
get to about 20 percent of their beginning dimensions or irregular
wear is detected. The wear of a jaw die should be gauged by the
Pictured is a brandnew jaw die. Jaw
dies should be
flipped or replaced
once the remaining
corrugations get to
about 20 percent
of their beginning
irregular wear is
remaining corrugations at the bottom, not the overall weight of
the jaw die itself.
Aim for attrition crushing
If the proper feed size is introduced into the jaw and the jaw die
maintenance is performed as recommended, the result will be a
higher output, and true attrition crushing will take place. Attrition
crushing, or rock-on-rock crushing, helps with output gradations
and improves wear cost for the producer, as more of the wear
takes place on the rock rather than the jaw dies.
As with all crushers, the maintenance of a crusher depends
on how it is applied and taking a proactive approach to maintenance items like wear parts. Replacing wear parts before they
VUE YOUR RESULTS
THE LATEST IN LOADER SCALES
Customizable Systems for Reliable Cost
Effective Fines Dewatering
Easy to Use 7'' Color Touchscreen Wheel Loader Scale
and Reverse Camera.
See your accumulated loads, target loads,
customer name, material and more.
Save Load Data to SD Card & USB Memory.
Full Featured Scale for any Operation.
JOIN US AT
2402 Watterson Tr, Louisville, Kentucky 40299
p: 502.499.6198 f: 502.499.1079
AGGREGATES MANAGER February 2014
www.loupelectronics.com or call (877) 489-5687