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Arrangement in machines for separating materials having different aerodynamic properties

  • US 4,634,522 A
  • Filed: 08/28/1985
  • Issued: 01/06/1987
  • Est. Priority Date: 12/10/1981
  • Status: Expired due to Fees
First Claim
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1. A machine for separating lighter and heavier materials based on their different aerodynamic properties comprising feed means for supplying materials for separation, a generally vertical passageway in communication with said feed means at one end, a hopper in communication with said passageway at its other end, said hopper having at least one generally vertically sloping wall located adjacent said other end of the passageway, means for generating an air current to draw a portion of said materials through said passageway into said hopper, throttle means located at said other end of the passageway adjacent to but separated from said sloping wall, sensor means located adjacent but separated from said wall and below said throttle means and in the path of said deflected airborne materials to generate electric signals in response to material impinging the sensor, said throttle means for controlling the flow rate of the air current, means for adjusting said throttle means, and a function circuit connected to the sensor to receive the signal generated by the sensor, said function circuit being operatively connected to said adjusting means for controlling the flow rate of the air current in response to said sensor signal corresponding to predetermined impingement intensity, said feed means operating independently of said sensor, a second hopper adjacent said first hopper, second means for controlling the flow rate of air current located between said hoppers, said second hopper having a pair of walls, one adjacent said second controlling means and the other distant therefrom, second sensor means for detecting impingements thereon and adjusting said second controlling means, said second sensor means being located adjacent said other wall of said second hopper, said other wall being generally vertically sloping.

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