45
september 2013
international
construction
CRUSHING AND SCREENING
Choices, choices
jaw crushers. This helps with efficiency and even loading of the
crusher chamber, as does the Continuous Feed System (CFS),
which is used to adjust feed conveyor speeds to keep the crushing
chamber loaded to the optimum level.
The heart of the machine is the articulated crusher jaw, which
on the one hand prevents blocking of coarse material and on the
other hand takes all fastening elements of the crusher jaw from
the wear area. In addition, the transfer from the pre screen or the
feeder trough is designed so that the material can simply tilt into
the crushing jaw and convey an even material flow.
IRock’s latest machine is the 2644 wheeled jaw crusher (WJC-
2644), which can produce up to 350 tons per hour (318 tonnes
per hour). The primary unit features a 36 ft (11 m) long, 48 in
(1.22 m) wide discharge belt which offers a stockpiling height of
11 ft (3.35 m) – said to be the highest available in the industry
for this class of machine.
The crushing chamber features hydraulic adjustment, from a
minimum of 2 in (50 mm) on the closed side to a maximum of
6 in (150 mm) on the open side.
Other features include a 24 in (610 mm) wide grizzly bypass
conveyor with an adjustable flop gate, as well as a 40 in
(1.02 m) by 14 ft (4.27 m) feeder with a 5 ft (1.52 m) grizzly bar
section. These features ensure that material is properly classified
and directed to either the side discharge conveyor or the crusher
discharge conveyor.
New from Terex Finlay is the 684 mobile screen, comprising
two 4.3 m x 1.7 m inclined decks. The screenbox features quick
wedge tensioning, access holes and a bottom deck hydraulic
tensioning system to reduce the time required for mesh changes.
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T
here has long been a trend in the crushing and screening
sector towards mobile equipment. With the fast set-up
and tear-down times possible with modern equipment,
and improvements made in transportability, there is great
flexibility to be gained from machines that can be used in
multiple locations, and which are easy to move around sites to
where they are needed.
And after decades of refinement in the design of such machines,
they have become well-honed to the needs of the sector.
The latest crushers from Kleemann, for example, are the 300
tonnes per hour Mobicat MC 110 Z and MC 110 R, which
have been redesigned from scratch to incorporate a series of new
features. These include hopper walls integrated into the chassis
and a fully hydraulic crushing gap adjustment, which combine
with previous features such as the independent double-deck pre-
screen.
Like the company’s Mobirex EVO series, drive variants
with direct drive crushers and electric drives for the vibrating
conveyors, belts and the pre screen, are now used for the mobile
The trend towards mobile equipment in the crushing
and screening sector continues apace, with new
machines and success stories coming in from around
the world. However, there is still a place for traditional
static plants.
Chris Sleight
reports.
IRock’s new WJC-2644 wheeled jaw
crusher features high capacity, high
discharge conveyor belts.
