Chapter 3: Theory
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Operators & Maintenance Manual GENIUS Compact Version UK 0.1 © BESTnv
BESTnv Industrial Research BV, Marinus van Meelweg 20, 5657 EN, EINDHOVEN, THE NETHERLANDS
General tel. +31 (40) 292 2622 - Service tel. +31 (40) 292 2620 - Fax. +31 (40) 292 2633 - Email: service.BESTnv@bestnv.com
Picture 3.3a: Reject system GENIUS
Air gun
manifold
Belt
Separation
plate
Reject
Accept
3.2.5. Removal of the defects
Once a detection is made, the electronics calculate the precise location of the object (every pixel has been
appointed to one - or more in case of overlap - specifi c air gun valves) and a few milliseconds later the
defect will be hit by a small blast of compressed air, which changes the trajectory of the object just after
they leave the belt and are in free fall, so that it will fall into the reject chute, underneath the separation
plate (see picture underneath).
Position and/or angle of separation plate and air gun manifold can be changed in accordance with tests
at the installation, with the different kinds of products that are to be sorted.
Furthermore it may be necessary to adjust the air pressure for the air gun valves, using the air pressure
regulator, if the different products that are to be sorted are quite different in size and/or weight.
Remember: - Moisture severely decreases the life expectancy of the air gun valves, so please
make sure that the compressed air supply is as dry as possible and take care not to
spray directly onto the air valves when cleaning with high-pressure cleaning
materials.
- The ideal distance between reject system and product stream is +/- 20 mm.
At this distance the overlap and false reject is reduced to a minimum.
In order to quickly test the air guns, the GENIUS Compact has been equipped with an air gun test system.
This system is operated via the touchscreen, and activates either one air gun, or all air guns sequentially.
For more info on the air gun test procedure, see chapter 8: Maintenance.
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