Operating Instructions
1-9DEZ
Description and Function
August 2005
12
3.4 Blast Unit – Rebound Chamber (Plenum)
Once the abrasive has impacted the work surface, the shot is directed into the rebound
plenum. This curved portion of the plenum absorbs a large percentage of the force
exerted by the high velocity abrasive and helps dissipate the heat generated by the
blast process.
3.5 Blast Unit – Deflector Plate / Hopper
This section (3.5) refers to 3.1.4 on page 16.
Once the contaminated abrasive leaves the rebound plenum, it enters the separator and
immediately encounters the deflector plate. The deflector plate slows the abrasive
down even more before it enters a tray at the bottom of the deflector plate. The
contaminated abrasive hits the abrasive already at the bottom of the plate and
effectively absorbs any residual force left in the moving mixture. The contaminated
abrasive then falls through a curtain of high velocity clean air, which physically
separates the heavy abrasive and the lighter contaminants. The air wash pulls the
contaminants through the separator towards the exhaust and eventually to the dust
collector. The clean abrasive falls to the bottom of the separator, then into a hopper
where it can be recycled.
3.6 Blast Unit – Abrasive Seals
This section (3.6) refers to Figure 6.1.1 on page 26.
Magnetic abrasive seals are present on all sides of the rectangular opening at the
bottom of the blast housing. These magnets should be charged with a load of abrasive
before the blasting process begins. During the blasting process, they will attract any
loose abrasive onto their surface, thus providing a “seal” to help contain the high impact
abrasive from escaping the blast chamber. The leading and trailing edges of the blast
chamber are equipped with additional brush seals mounted on the outside of the
magnetic seals. The brush seals drag across the work surface allowing clean air to be
drawn inside the 1-9DEZ. The air draw aids in the cooling and the recycling process.
Summary of Contents for 1-9 DEZ
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