Vibratory conveyor system for adjusting the periodic resultant forces supplied to a conveyor trough

  • US 5,615,763 A
  • Filed: 08/18/1995
  • Issued: 04/01/1997
  • Est. Priority Date: 08/18/1995
  • Status: Expired due to Term
First Claim
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1. A vibratory control system for adjustably controlling a resultant force supplied to a conveyor trough by changing a phase angle relationship between eccentric weights mounted on rotating shafts comprising(a) a base connected by a plurality of spring members to a conveyor trough;

  • (b) a frame connected to said conveyor trough;

    (c) three shafts each coupled to and rotating respective associated eccentric weights, a first shaft of said three shafts being driven by a first motor and driving a second shaft at the same revolutions per minute, and a third shaft being driven independently of said first shaft by a second motor;

    (d) a speed control device continuously adjusting the speed of one of said first and second motors and the revolutions per minute of said shafts driven by said one motor so as to maintain the real phase angle at approximately the same value as the predetermined phase angle, said first and third shafts and associated eccentric weights being constantly in phase with each other, and the angle difference between said first and third shafts and associated eccentric weights and said second shaft and associated eccentric weight determining said relative phase angle, said associated weights collectively imparting a resultant vibratory force to said conveyor trough;

    (e) a pair of phase angle sensing devices each associated with said first and third shafts and associated eccentric weights for generating a signal indicative of the position of the associated eccentric weight;

    (f) a control device responsive to the signals received from said phase angle sensing devices formeasuring a real time phase angle between said eccentric weights and comparing the real phase angle value and a value of a predetermined phase angle andgenerating a phase angle signal proportional to a difference between said real and predetermined phase angles; and

    (g) a motor speed control device responsive to said phase angle signal for adjusting the speed of one of said motors until said real phase angle has about the same value as said predetermined phase angle.

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