Page 39 - HUB-4 Magazine Issue 97

Aggregate Washing & Screening
QMS washing plants for clean,
accurately sized aggregate
QMS washing plants are bespoke, specialised
The key components include material feeders to deliver raw
systems used to separate, clean, and size
materials to the plant and evenly distributed using vibrating
aggregates, producing high quality materials.
feeders for a consistent flow into the screening system. QMS
The washing systems are used in conjunction
SVI and SH screens separate materials by size while scalping
with the QMS range of SVI and SH screens that
screens provide rapid separation and protect downstream
have found a real niche in processing raw
equipment. The screens are fitted with sand washers or fine
materials such as sand, gravel, crushed stone,
material washers that remove contaminants using water spray
slag, iron ore and recycled concrete. Their
systems. These can be configured as inclined or horizontal,
primary functions are to separate materials by
with single, double, triple or quad deck screens.
size, remove impurities, and optimize production
The SVI-Inclined and SVH-Horizontal Screens drive mechanism
efficiency.
consists of two MVU modular vibrators connected with a
cardan shaft. These feature advanced dust proof cartridges. The
extremely compact and interchangeable units are designed to
make maintenance easier compared to a conventional shaft
design, with two bearings per vibrator, they also provide
exceptional long bearing life. The vibratory mechanism is
located at the centre of gravity, giving circular motion at all
points of the screen.
There are three sizes of modular Vibrators available to cover
the range of QMS screens. The standard size of the inclined
screens ranges from 1.22 to 3.1m in width and 3.6 to 8m in
length and are available in one to four deck arrangements.
Available in standard and custom sizes, the horizontal screens
feature two to four deck configurations, with sizes up to 7 ×
2.4m, making them highly versatile for different applications.
Bespoke designed screens can also be made to fit into existing
structures.
With the inclined screens,
the shaft line is positioned
at the centre of gravity
resulting in a perfect
circular motion at all
points of the screen.
Combined with an
adjustable inclination
from 12-22°, this circular
motion delivers enhanced
screening efficiency for all
types of applications such
as primary, secondary, and
final size screening.
Adjustable
counterweights allow for
easy eccentric stroke
adjustment to fine tune performance specific to the
application requirements. Compared with other circular motion
screens, QMS screens provide maximum space between decks.
This makes it easier, safer, and more comfortable for operators
during maintenance intervals. Screen maintenance is easier as
the vibrating mechanism comprises of an alloy steel shaft
fitted with grease labyrinth seals and amplitude adjusted by
moveable balance weights.
Highlighting the efficiency of its screening and washing plants
is the QMS installation at the Cemex Pyford Brook Quary. The
Pyford Brook Quarry has been built to produce sand and
gravel at a relatively high production rate of 250tph. The QMS
plant provides an initial feed to the grid along the belt feeder
consisting of 150mm+ sand and gravel which is then crushed
down by a cone crusher before going to a double deck
polyurethane primary screen. A double deck washing screen
then further processes the material to produce a -20mm
product. The final product is then refined to be used in the
manufacture of Ready-Mixed Concrete for use on HS2.
www.hub-4.com March/April - Issue 97
| p39 |