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19
The MOdUlaR SySTeM
6.2
Operational function and concept
The mobile shotblasting systems that exist today are mostly equipped with a blast wheel.
Other designs have two or more centrifugal blast wheels. The principle of a system with
two blast wheels is shown in chapter 6 (the modular system).
6.3
Shotblaster with extended blasting width
Shotblaster with extended blasting width
1 Centrifugal blast wheels with direction of rotation indicator
2 Shot abrasive.
3 Blast width - can be doubled as a result of the extension unit
This type of construction is produced with double or multiple housings. The housing con-
sists of a solid welded construction. The advantages of mobile shot blasters with more
than one blasting wheel are a smaller overall height with the same blasting width. One of
the limits of the use of mobile shotblasters is that the surface to be blasted is too soft and
the rubber ball effect (rebound) of the impacting blasting abrasive shot is dampened. The
shot no longer automatically jumps back into the shot compartment store. This conse-
quence is often referred to as «carpet laying». This means that the shot loses its momen-
tum and falls back down from the rebound chamber onto the surface to be blasted. At the
same time, the blast wheel continues to propel the shot out of the shot compartment sto-
re. The machine loses all of its abrasive. This effect, "carpet laying", is influenced by the
hardness of the surface to be blasted, but also by the height of the reclaim chamber.
It is generally accepted therefore that the higher the reclaim chamber, the greater the dan-
ger of "carpeting" by the shotblaster. In these circumstances, other surface preparation
machines should be applied first, e.g. concrete planers and grinders. Efficient working
with shotblasting machines in this competitive industry requires machines with increasin-
gly larger working width. Machines with a single blast wheel can achieve this only through
an increase in size together with a higher positioning of the blast wheel. Consequently the
height of the machine is significantly increased which results in much larger, overall dimen-
sions. The resultant extended reclaim chamber thus causes a longer return journey for the
shot.
The machine becomes heavier and bulkier in its dimensions. A low rebound height is the-
refore always an advantage and decisively increases the usability of the machine. The
Shotblaster machine mobile shot blaster is manufactured in a modular manner.
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