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Blast Rooms for Bead Blasting, Grit Blasting, Shot Blasting, Steel Grit Blasting, Plasitc Media Stripping and Shot Peening
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The Airblast
range of blast rooms incorporates a choice of two means
of abrasive recovery. The most popular and by far the most
automated system being the Airflex sweep floor. But, where
budget imposes constraints on the specification, a secondary
option of suction recovery is also available.
Airflex Scraper Recovery Floor System typically suited to a production shotblasting environment.
The floor for the automatic recovery of abrasive materials
is made of modular corridors of six standard widths that
can be produced to any length giving enormous flexibility
to recover from virtually any floor area.
Each corridor has a series of flexible scraper blades set
at preset intervals. The blades rest against galvanised
steel combs thus allowing it to push or pull the abrasive
when the comb is behind the flexible scraper. On the alternate
stroke the comb passes through the abrasive and the scraper
blade passes over it. This back and forth motion, when repeated,
causes the abrasive to be shunted along with each alternate
stroke.
Eventually each individual accumulation of abrasive, in
the linear corridors, is deposited into a transversal corridor
running at right angles to the rest of the floor. This transversal
corridor transfers the abrasive to the elevator and grit
wash. This unit comprises of a primary vibrator sieve and
air wash. In this section any remaining dust is taken to
the dust collector, spent abrasive and large contaminants
to a collection bin. This method of separating spent abrasive,
in a way that they are not taken to the dust collector,
means that the collector elements are prevented from suffering
premature wear. The operator, who, by adjusting the power
of the vacuum placed on the abrasive decides what minimum
size of particle he wishes to remain in the system i.e.
the higher the vacuum the larger the particle taken out
of the abrasive.
Clean
abrasive is now all that remains and is deposited in a silo
equal in capacity to the volume of the blast machine or
machines. Once all the abrasive in the blast machine has
been delivered or at any other time the operator releases
the dead mans handle the blast machine is automatically
charged with fresh abrasive from the silo above.
To download a movie showing the Recovery floor in action
click the link below.
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Shallow
floor: in the case of the vast majority of installations,
an excavation of only 130mm is required. If your particular
application will allow a step into your blast room of this
dimension our system then can be set on your existing floor
level thus eliminating the requirement for any civil work
whatsoever. Even our elevators will work at ground level
(eliminating the need of a pit).
Virtually silent working operation, the simplicity of our
design and the lack of metal components used to pass abrasive
through the room ensures low sound levels during recovery
mode.
Economical: Low power consumption, our standard 1.1kW driving
system is power enough to drive a corridor of 1.5 x 10m.
Compared with most screw systems for recovery our system
uses a fraction of the electricity during running time.
The Vaculift,
with its high recovery rate, is an ideal system for in-house
blasting operations where the justification of a floor recovery
system does not exist.
An air wash system separates dust and debris from the recovered
abrasive. This allows valuable resources that would otherwise
be thrown away, to be cleaned and returned to the blast
machine or an optional storage hopper located above the
machine. The lighter dust is transported to a dust collector,
whilst the heavier contaminants are caught in a screen.
A two-way air valve enables the operator to switch from
blasting mode to recovery mode in seconds ensuring high
productivity.
Media
Recovery Rates
Aluminum Oxide Abrasive, recovery/recycling
rate (depending on operating conditions) 23 tonnes per hour
achieved with a 250cfm compressor and mid-range grit size.
Cleaned abrasive is stored in the blast pot or a 300ltr
(approx) hopper which dispenses grit via an iris valve on
demand.
Metal Abrasive, recovery/ recycling rate (depending on operating
conditions) 12 tonnes per hour achieved with a 250cfm compressor
and mid-range grit size.
Modular
Blast Room
For a
more bespoke facility design our Modular system offers a
more flexible solution than our Containerised range. These
rooms primarily made from a standard 2mm galvanised steel
formed panel, complimented with heavy duty doors and door
frames. They can be built up to almost any shape and size
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Containerised Blast Room Systems
When considering what mass produced enclosures
can be adapted for the use of a blast room nothing quite
compares with a standard shipping container. These obviously
sturdy and watertight enclosures ideally lend themselves
for blast room conversion. Besides standard shipping sizes
ie. 10ft, 20ft and 40ft we are able to offer a enclosure
built on the principles of a shipping container, but manufactured
to any size. Where transportability, outdoor location or
adherence to a tight budget are important these units are
very popular.
Dust Extraction
Ventilation Systems Dust
Extraction
Unlike many of
our competitors, Airblast manufactures their own range of
reverse pulse jet and shaker systems. All Airblast rooms
are ventilated at a through rate of 50 ft/min this can be
up to twice as much of the rate offered by many of our competitors.
It is our experience that 50ft/min is the ideal solution
when trying to suspend a particle of abrasive dust along
the length of a blast room without grit carry over to the
dust extraction. Generally for applications of up to 6000cfm,
we would recommend shaker filter purely on the grounds of
economics. Thereafter our reverse jet cartridge unit would
be recommended. To download a movie showing how well an
Airblast room is ventilated, please click the link below.
Our Fifty Foot per Minute Extraction Process
Powered by the specified fan the room can be
efficiently extracted of airborne dust particles to leave
the operator with minimal visual hindrance whilst blasting.
This is achieved by locating the air inlets on the roof
at the front of the blast room and extracting the air and
dust at low level at the rear of the blast room. Spanning
the inlets and extraction outlet across the width of the
room helps achieve smooth laminar flow through the room.
This helps eliminate the number of dead and turbulent areas
in which dust may be held. Each set of air inlets is specifically
designed for each facility. Introducing air into the room
and extracting air at certain velocity (governed by physical
dimensions of inlet and extraction openings) has proven
to be the most effective at providing sufficient flow to
carry dust particles whilst remaining laminar and uniform
over the length of the room.
The Three-Stage Air Inlet System
Described is the route which air takes from
outside to inside of the blast facility.
Stage 1: Filter material allows air to
pass through but eliminates the ingress any foreign body
into the blast room environment. This material also acts
as a third stage physical barrier for the escape of grit
and helps attenuates noise emitted from the blast process.
Stage 2: Fabricated box acts as a second
stage main baffle stop for any ricocheted grit particles.
Stage 3: Fabricated cross mesh of flats.
This serves two purposes. It is the first stage to help
eliminate grit escape. Any ricocheting grit is likely to
hit one of the main cross members of the mesh. This will
dissipate it’s energy and due to the nature of gravity aided
by the velocity of the incoming air should cause the particle
to stay within the blast room. The second purpose of this
mesh arrangement is to settle the flow by eliminating larger
scale turbulence, or eddies. Large eddies outside the room
will reduce in size as the air passes through the fabricated
box section. Any eddies here will then be reduced further
into smaller eddies which will enter the room and are much
more likely to develop into to laminar flow which will continue
through the blast room.
The Complete Turnkey Package
Airblast offers a new or refurb compressed air package enabling
us to provide our customers with a complete solution to
the blasting process problems.
For
more in depth information on our spray booths, compressors
and dust extraction systems, please visit the links below.
Compressors
Dust
Extraction
Spray
booths
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