Conveyors: power-driven – Conveyor section – Reciprocating conveying surface
Patent
1988-07-28
1989-03-14
Skudy, R.
Conveyors: power-driven
Conveyor section
Reciprocating conveying surface
198769, 318114, 318127, 318128, B65G 2732
Patent
active
048118354
ABSTRACT:
Mechanical resonance of the vibratory feeder is maintained by minimizing a phase angle difference between substantially sinusoidal drive voltage and current wave forms. The mass flow rate of material being fed is controlled by controlling the electrical power applied to the vibratory feeder compared with a desired electrical power computed from a desired flow rate. The preferred embodiment includes synthesized drive wave forms which are variable in frequency and amplitude in order to maintain the vibratory feeder in mechanical resonance at the desired flow rate. Resonant operation and accurate material flow are accomplished without use of electromechanical vibration sensors and control is accomplished using the magnitude and phase relationships between the applied voltage and current drive wave forms.
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K-Tron International Inc.
Skudy R.
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