stress associated with welded construction methods.
Engineers designed this in such a way to isolate the
spray bars from all vibration, utilizing high quality rubber
gators on the mid and bottom decks.
Top deck rubber extensions also prevent overspill or
splashing from the top deck screen. The 165R-3 gives
an 80 ft² (7.54 m²) of screening area on all three decks.
Each deck has eight individually controlled spray bars
fitted with polyurethane fan type spray nozzles. An
advanced rolling chute
arrangement gives the
ability to blend top deck
and mid deck overflows
as well as mid deck and
bottom deck overflows
wh i ch wi l l prove ver y
usefu l i n const ruc t i on
and demolition recycling
applications. The screen
i s des i gned to rece i ve
standard polyurethane
modular screens (woven
wire screens option also
available) on all decks.
The large capacity split sump tank receives the rinsed
fines from the bottom deck screen into either a course
or fine compartment. The course side of the tank has a
built-in float system to help equalize the levels in both
tanks and prevent overflowing. Large inspection doors
are included in both tanks as well as butterfly valve
drains on both sides. The tank is also fitted with anti-
turbulence plates and a pump protection system.
Two centrifugal slurry pumps (Course & Fine) are
used to pump material from both sides of the sump
tank into two hydrocyclones. The hydrocyclones remove
silts and clay (material below 63 micron) which are sent
to the water treatment plant. The heavier material
(above 63 micron) exits the bottom of the hydrocyclones
into a rubber-lined box where blending can take place if
required.
The underflow from the hydrocyclones transfers
onto a dewatering screen via a discharge box which
equally distributes the material across the screen to
increase the dewatering screen area. Both materials
are dewatered over a 500 micron polyurethane screen
to produce two instantly salable grades of sand. The
high energy dewatering screen is fitted with two high
efficiency counter rotating vibratory motors which
remove capillary water to produce two dewatered
sands. The rubber lined catch-box under the dewatering
screen carries the underflow back to the tank for
recirculation through the cyclones.
The AggreSand system has the option of five
conveyors, three aggregate and two sand. The 650 mm
wide conveyors are powered by direct drive electric
motors and gearbox arrangements. The 9.3 m long
conveyors are angled at optimum height for excellent
production. The two conveyors have an automated
radial wheel drive system that increases stock piling
capa c i t y t o 350 m³ .
The aggregate oversize
conveyor has a feature
whereby it can be placed
on either side of the
machine to site set-up/
preference . The 4 m
stock pile height of these
conveyors make them
suitable for producing
stock piles or feeding
other equipment within
the Terex product range.
There are 600 mm
wide access platforms on
both sides of the machine allowing easy access to both
the rinsing and dewatering screens. All walkways and
handrails are galvanized as standard with curved ends
and expanded metal floors.
The centrifugal slurry pumps are mounted on roll
in – roll out tables for ease of access and maintenance.
The main feed conveyor section which travels over the
aggregate screen is hinged so that it can be raised to
allow greater screen access. The rinsing screen has a
roll away chute to also allow for easy access to all screen
decks.
The plant is also fitted with a high pressure
retractable wash down hose. If required the spraybars
can be easily removed for maintenance purposes. The
pumps on the plant are fitted with drains for drainage in
frosty conditions to virtually eliminate downtime.
Set up time will typically be one day making the
plant ideal for long or short term contracts. It has an
economic water requirement and is ideal for coupling
to a water treatment plant to recycle this water thus
reducing the overall water requirement. The plant was
designed to have a small footprint, also reducing the
requirement for major ground preparation work.
Page 26
Contractors World - International Vol 4 No 3
What’s New in Plant & Equipment
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