What are the disadvantages of Arbo resonant frequency feeders and conveyors?
All vibratory feeders depend upon the material to flow when subjected to vibration – they are not positive displacement devices and are not suited for sticky or cohesive materials. Also some blends of non-homogenous materials are subject to segregation when vibrated.
A quick and easy test would be to take a small amount of material in your hand. Make a fist, squeeze, and open it. If the material is packed into a snow ball, a vibratory feeder would not be suitable.
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What type of feeder delivers a better accuracy, a vibratory or screw feeder?
For the majority of applications, a resonant frequency vibratory tray feeder will work better than a screw feeder!
Not all vibratory tray feeders are created equal. Older vibratory feeders work at 60 Hz and are not very linear or versatile. the new ones work at the resonant frequency of the tray and the mateial on the tray and replace many screw feeders today. A 1000 to 1 turn down ratio and low cost makes them hard to beat.
95% of all man made materials can be fed using the vibratory tray feeder. To determine suitability check the material(s) with the snowball test. If the material can be compressed into a snowball, vibratory tray feeders will not work. Two materials exemplify this plass: pure Titanium Dioxide and Carbon Black in fine powder form. If you cannot make a snowball out of the material, go ahead with confidence and select a resonant frequency vibratory tray feeder!
With respect to accuracy, a vibratory tray feeder is inherently better. Just look at the discharge end of a screw feeder. See the uneven discharge? Now compare it with a waterfall flow at the discharge end of a vibratory tray. To obtain a good handle on accuracy when choosing a feeder, insit on a good 2 SIgma test using short samplin time, such as 2 seconds. A 2 Sigma test based on several consecutive samples at 60 second intervals means the screw feeder needs 60 seconds to balance the uneven flow at the screw end.
The advantages of the resonant frequency vibratory technology, pioneered by ARBO, are obvious when tested at short sampling intervals.
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