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Portable
plants - a balancing act
Nordberg NW300HPS
mobile closed-circuit crushing and screening plant.
Portable
plant designers must balance strength and rigidity against weight and
height, compactness against ease-of-use and serviceability. They must
address today's requirements while looking for tomorrow's emerging trends.
Metso Minerals claim they have found the balance with a new family of
portable crushing plants based on its Nordberg HP400 and HP500 high-performance
cone crushers. There are three conveyor options for each model to suit
customer requirements: rear discharge, side discharge and rear feed-side
discharge. A wide range of chassis options provides additional process
flexibility.
User-friendly
design
According to Metso, the NW400HP and NW500HP
plants were designed with input from people who operate and maintain
them, resulting in plants that are highly mobile, reliable and user-friendly.
For example, the crusher discharge hopper is a radial design for optimum
performance in both rear and side discharge configuration. AR steel
wear surfaces are used for longer life. There is more space under the
crusher than in earlier designs plus a larger access door in the hopper,
making regular inspection easier. An integrated operator platform and
drive guard has generous access doors, providing easy access for checking/tensioning
belts or cleaning sheaves.
All conveyors are straight-line design,
with no curve from the load point to the discharge, for reduced spillage
and improved belt tracking. For increased durability, the conveyors
feature C5 troughing idlers and rubber disc returns, plus impact idlers
at the load point.
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| Nordberg
NW125VF20 portable plant with a C125 jaw crusher and fixed front
discharge conveyor |
Shape and serviceability
The
Nordberg HP400 and HP500 cone crushers are described by the manufacturer
as having a broad application envelope. The remote controlled hydraulic
system has independent bowl clamping, clearing and setting adjustment.
Major components are serviced from the top and front of the crusher.
The Nordberg NW300HPS is a highly mobile,
closed-circuit crushing and screening plant that can transform feed
stock into three finished fractions.
The chassis features AR steel wear surfaces
in the crusher discharge hopper, under screen hopper, crusher by-pass
chute and rear transfer chute. The service platform provides walk-around
access to three sides of screen with ladder access on two sides. The
1524 mm wide under-screen conveyor provides high capacity while allowing
a lower plant profile.
Designed for mobile applications, the
Nordberg HP300 cone crusher is compact and efficient with a broad application
envelope. The remote controlled hydraulic system has independent bowl
clamping, clearing and setting adjustment. Major components are serviced
from the top and front of the crusher. Metso claims its HP series produce
excellent particle shape as well as providing more up time and more
consistent products.
Three shafts
and more
Feeding the cone is the FS303CL 6x20
triple-deck, triple-shaft screen. According to Metso, the tripe-shaft
shaft design produces a true elliptical stroke to resist pegging and
blinding. The screen design allows three options for handling the second
deck overs: discharge to the product chutes; go to the crusher with
the top deck overs; or split a portion each way. Dual flop gates in
the crusher by-pass chute allow second and third deck overs to discharge
separately to either side of the plant, or be combined to either side.
Conveyors also feature C5 troughing idlers
and rubber disc returns, impact idlers on the crusher discharge conveyor,
and an impact bed on the screen feed conveyor. The under-screen conveyor
has four side guide rollers for improved belt tracking and a non-contact
return belt plough.
There is a wide range of chassis, screen
and crusher options to tailor the plant to customer requirements and
provide additional process flexibility.
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| Nordberg
NW400RD incorporates a HP400 cone crusher. |
NW125
The Nordberg NW125 portable plant has been designed and built for high
tonnages. According to Metso, the emphasis with the NW125 is on throughput
and durability, from the heavy-duty feeder hopper to the generous discharge
conveyor. There are two configurations: the NW125-VF20 with fixed front
discharge conveyor and the NW125-VFX20 with folding, extended discharge
conveyor.
The heavy-duty chassis starts with 609
mm deep wide flange main beams. A quad-axle, spring suspension with
11R24.5 radial tires is standard. The integral crusher discharge hopper
incorporates stone-box design and AR steel wear surfaces for longer
operating life. Since mobile crushing plants see a wide variation in
feed type and gradation, the NW125 features a large capacity hopper
made of reinforced plate steel and a feeder with changeable grizzly
bar spacing. The optional folding hopper extensions measure a full 3.66
m wide provides a larger target for wheel loaders. Optional variable
speed drive allows precise feed rate control for increased throughput.
In situation where a high percentage
of natural fines are present in the feed material, the optional fines
reject conveyor and gated by-pass chute provide added flexibility to
deal with them. Crusher output is managed by the 1219 mm wide discharge
conveyor featuring a heavy-duty impact bed, 127 mm diameter troughing
idlers and 3-ply belting. The folding, extended conveyor on the VFX
model has a 4.27 m discharge height for feeding a surge bin or when
running the plant by itself. Hydraulic folding is included on the VFX
model when the hydraulic chassis raising/lowering option is selected.
The heart of the NW125 portable system
is the C125 jaw crusher. According to Metso, bolted frame construction
and the absence of weld-induced stress risers give the C125 increased
durability against shock loads. Plus, the pitman and cross members are
made from high quality cast steel. Wedge type setting adjustment is
quick and easy to use while reversible jaw dies increase utilization.
www.metso.com
Mobile
impactor offers increased productivity
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| Komatsu BR480RG-1
self-propelled impact crusher |
Now
available from Komatsu Canada is the new 38 300 kg BR480RG-1 self-propelled
impact crusher. Designed to provide a mobile primary crusher for recycling
and demolition work or as a secondary rock crusher in quarry applications,
the BR480RG-1 is the third and newest member of Komatsu's mobile crusher
product family. The other track-mounted machines are the 47 500 kg,
306 hp BR550JG-1 and the 29 400 kg, 158 hp BR350JG, both fitted with
high performance Komatsu jaw crushers.
The BR480RG-1 is equipped with Komatsu's
KR1313 impact crusher with a production capacity rated at 100 to 400
tonnes/h, is one of the largest crushers that can be transported without
disassembling, states the manufacturer. It is capable of producing large
volumes of spec product in a single pass. The 1250 mm diameter x 1300
mm wide rotor has variable speed drive to allow the processing volume
and gradation to be adjusted quickly. The rotor operates at 350 to 630
rpm. The maximum feed size for concrete rubble is 750 mm x 500 mm x
350 mm while the optimum feed size is 350 mm x 350 mm x 350 mm. The
maximum feed for natural stone is 350 mm x 350 mm x 350 mm with an optimum
size of 150 mm x 150 mm x 200 mm. According to Komatsu, the optimum
feed size is the size of material that can be fed to the crusher continuously.
Power for all functions of the BR480RG-1
is supplied by a Komatsu 306 hp SAA6D125E-2, a 4-cycle, water-cooled,
direct injection diesel engine that meets Tier II emission standards.
Komatsu's patented HydrauMind hydraulic technology is utilized for the
hydraulic steering and all-hydraulic drive systems. The undercarriage
of the Komatsu PC200LC hydraulic excavator provides the platform for
the new crusher and all of its components. The maximum travel speed
is 1.0 km/h. A switch is provides to change between crushing, travel
and maintenance modes.
The mobile crusher offers a number of
features to boost productivity including an automatic gap adjustment
mechanism that allows the gap to be changed by simply inputting the
outlet gap size. The feed hopper is accessible from three sides for
easy loading and transport. The feeder system automatically adjusts
the feed in the event the crusher becomes overloaded. The vibrating
grizzly uses an upward slope feeder and two-stage grizzly-bar to remove
muck and to make it difficult for finer material to enter the impactor,
thus increasing life on internal wear parts. The large capacity, high-speed
1200 mm wide discharge conveyor is designed for quick ejection of crusher
products. The discharge height is 3 m.
The BR480RG-1 uses a proven monitoring
system along with other construction equipment related technologies
for improved performance and reliability.
In addition, a pre-cleaner and double
element air cleaner prevent dust from entering the engine. Further,
a water spray system with water tank, water pump and two spray bars,
aids in controlling crusher dust from entering the atmosphere. This
system comes as standard equipment.
Design features include emergency shut-off
buttons located on both sides of the chassis, the control panel and
the optional radio remote control. Another safety device is a rotating
beacon that flashes to indicate travel mode, excessive load on the crusher
or when there are unusual operating conditions. A buzzer alerts the
operator in the event of an abnormal shutdown of the conveyor belt or
optional equipment. www.komatsu.ca
March-April
2003 issue
Aggregates
and Roadbuilding Magazine
E-Mail: rocktoroad@sympatico.ca
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