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Material screening apparatus

  • US 8,505,738 B2
  • Filed: 02/16/2007
  • Issued: 08/13/2013
  • Est. Priority Date: 02/16/2006
  • Status: Expired due to Fees
First Claim
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1. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

  • a support chassis;

    a horizontal screen box apparatus, the screen box mounted on the support chassis and having an upper screen deck and a lower screen deck;

    the mobile screening apparatus further comprising an additional pre-screening module, which is slideably connected to, and supported on, mounting means provided on the support chassis, the pre-screening module having an upper inclined screen and a lower inclined screen wherein the pre-screening module is provided with an upper conveyor and lower conveyor, the upper and lower conveyors being arranged parallel to the upper inclined screen and a lower inclined screen, the upper conveyor being adapted to convey material to the pre-screening module screens and the lower conveyor being adapted to transfer material from the pre-screening module to the horizontal screen box apparatus;

    the screening apparatus further comprising at least one lifting ram that extends from the support chassis to the pre-screening module, the at least one lifting ram operable to move the pre-screening module between a horizontal stowed position and an operational position in which the angle of inclination of the pre-screening module is altered to thereby tilt the pre-screening module relative to the horizontal screen box, and,when the pre-screening module is being moved from the stowed position to the tilted operational position, the at least one lifting ram is further operable to simultaneously pull the pre-screening module along a plurality of rollers on the support chassis to a position above the horizontal screen box so that the particulate material is conveyed from the lower inclined conveyor to the pre-screening module to the horizontal screen box, and,whereby the provision of the horizontal screen box and the pre-screening module provides five different grades of material as output from the mobile screening apparatus, including reject unscreened material and four different grades of screened material.

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