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Hydraulic metering control

  • US 4,700,895 A
  • Filed: 12/02/1985
  • Issued: 10/20/1987
  • Est. Priority Date: 12/02/1985
  • Status: Expired due to Fees
First Claim
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1. In an apparatus for field application of particulate solids from an elongated boom carried on a wheeled vehicle including a supply hopper, first conveying means for delivering solids at a controlled rate from the supply hopper to a receiving zone at the inboard end of said elongated boom, second conveyor means for moving material from said receiving zone and along the length of said elongated boom, said apparatus being characterized in that:

  • (a) said elongated boom includes upper and lower generally superposed enclosed particulate solid transfer ducts, said upper duct being in communication with said receiving zone and having a boom conveyor therein for moving particulate solids from said receiving zone outwardly along said upper duct, said upper duct having a plurality of axially spaced openings formed along the base thereof and providing a communication path for particulate solids from said upper duct to said lower duct;

    (b) said lower duct comprising a metering duct and having a metering screw mounted for axial rotation therewithin to move particulate solids along an axial direction inwardly of said elongated boom and counter to the direction of movement of solids in said upper duct;

    (c) a plurality of openings formed in said lower duct for metered rate release of said particulate solids therefrom; and

    (d) drive means for rotating said metering screw at a predetermined controlled rate, said drive means including a hydraulic motor, pump means having a variable output capacity for driving said hydraulic motor, said pump means having drive means operatively coupled to a drive shaft of said vehicle for maintaining the drive rate of said pump means proportionate to the speed of said vehicle, and control means accessible to the operator for controllably adjusting the output of said pump means to said hydraulic motor so as to adjust the rate of rotation of said metering screw.

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