Screen cloth for vibrating or stationary screens
AssigneeSYNCRUDE CANADA LTD. in trust for the owners of the Syncrude Project
InventorsJOHN TIEU, GILBERT RUMBOLT, DANIEL MacNEIL
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Abstract
An impact screen cloth for use in a screening device for screening out oversize objects in a material flowing in a direction is provided, comprising a metal plate having a perimeter and comprising a plurality of openings therethrough and forming a grid having longitudinal ligaments substantially parallel to the direction of the material flow and transverse ligaments substantially perpendicular to the direction of the material flow; and a number of longitudinal wear bars positioned on an equal number of longitudinal ligaments to cover a substantial portion of the number of longitudinal ligaments without substantially interfering with the openings.
Claims20
An impact screen cloth for use in a screening device for screening out oversize objects in a material flowing in a direction, comprising:
- a metal plate having a perimeter and comprising a plurality of openings therethrough and forming a grid having longitudinal ligaments substantially parallel to the direction of the material flow and transverse ligaments substantially perpendicular to the direction of the material flow;
- and
- a number of longitudinal wear bars positioned on an equal number of longitudinal ligaments to cover a substantial portion of the number of longitudinal ligaments without substantially interfering with the openings.
A screen for use in a vibrating or stationary screening device, the screen having a feed end and a discharge end, for screening oversize objects in a material is provided, comprising:
- a plurality of screening rows positioned end to end between the feed end and the discharge end, each screening row comprising at least one impact screen cloth comprising a metal plate having a perimeter and having a plurality of openings therethrough to form a grid having longitudinal ligaments substantially parallel to the direction of the material flow and transverse ligaments substantially perpendicular to the direction of the material flow;
- whereby at least one of the screening rows further comprises a number of longitudinal wear bars positioned on an equal number of longitudinal ligaments of each screen cloth in the screening row.
An impact screen cloth for use in a screening device for screening out oversize objects in a material flowing in a direction, comprising:
- a frame having a first and second side edge, a top edge and a bottom edge;
- a plurality of transverse ligaments extending from the first side edge to the second side edge;
- a plurality of longitudinal ligaments extending from the top edge to the bottom edge and intersecting the longitudinal ligaments to form a mesh having a plurality of essentially equal sized openings;
- and
- a number of longitudinal wear bars positioned on an equal number of longitudinal ligaments to cover a substantial portion of the number of longitudinal ligaments without substantially interfering with the openings;
- whereby the material flows from the top edge to the bottom edge of the screen cloth.
An impact screen cloth for use in a screening device for screening out oversize objects in a material flowing in a direction, comprising:
- a frame having a first and second side edge, a top edge and a bottom edge;
- a plurality of transverse ligaments extending from the first side edge to the second side edge;
- a plurality of longitudinal ligaments extending from the top edge to the bottom edge and intersecting the longitudinal ligaments to form a mesh having a plurality of essentially equal sized openings;
- and
- whereby at least one of the longitudinal ligaments has a height greater than the transverse ligaments and the material flows from the top edge to the bottom edge of the screen cloth.
A method for screening an oil sand slurry having oversize reject material, comprising:
- providing a screen having a number of impact screen cloths, each impact screen cloth comprising a metal plate having a perimeter and a plurality of openings therethrough and forming a grid having longitudinal ligaments and transverse ligaments, wherein a number of the longitudinal ligaments have longitudinal wear bars positioned thereon to cover a substantial portion of the number of longitudinal ligaments without substantially interfering with the openings;
- and
- feeding the oil sand slurry onto the screen so that the slurry flows in the direction of the longitudinal ligaments and allows the oversize reject material to ride on top of the longitudinal wear bars to reduce wear on the impact screen cloth.
Dependencies are inferred from the claim text.