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Control apparatus for plastic blending machinery

  • US 4,756,348 A
  • Filed: 08/07/1986
  • Issued: 07/12/1988
  • Est. Priority Date: 08/07/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for controlling the flow of fluent material from a material supply to a receiver, said apparatus comprising a generally vertical delivery tube having a discharge orifice at its lower end;

  • a valve underlying said orifice and being of such area as to provide support for said material at its angle of repose and to close said orifice;

    means mounting said valve for substantially vertical movements toward and away from said orifice, said valve being movable from a fully open position in which a clearance exists between said orifice and material supported at its angle of repose on said valve through which material may flow into said receiver and a closed position in which said orifice is closed;

    sensing means coupled to said receiver for sensing an increase in the quantity of material in said receiver; and

    operating means coupled to said sensing means operable in response to the sensing of a predetermined increase in the quantity of material in said receiver to move said valve from said fully open position to an intermeidate open positoin between said fully open position and said closed position and reduce said clearance, thereby reducing the rate of flow of material through said clearance to said receiver, said operating means also being operable in response to the sensing of a further predetermined increase in the quantity of material in said receiver to move said valve from said intermediate position to said closed position.

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