Screen cloth for vibrating, rotating or stationary screens

Patent metadata

Field	Value
Publication number	US-9724732-B2
Application number	US-201514818057-A
Country	US
Kind code	B2
Filing date	Aug 4, 2015
Priority date	Aug 5, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A 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, the metal plate having an impact surface and a bottom surface; a coating or liner comprising an elastomer, coating or lining at least the impact surface of the metal plate or a portion thereof; and a wear material at least partially embedded into the elastomer coating or liner, or a portion thereof.

First claim

We claim:

1. A screen cloth having an impact face 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, the metal plate having an impact surface and a bottom surface;
a coating or liner comprising an elastomer, coating or lining at least the impact surface of the metal plate or a portion thereof; and
a wear material partially embedded into the elastomer coating or liner at a leading edge of the at least one transverse ligament relative to the direction of the material flow, such that a portion of the wear material is exposed on the impact face of the screen cloth to prevent the elastomer at the leading edge from tearing or gouging by the flow of the material.

2. The screen cloth of claim 1 , wherein the plate comprises a front edge, a back edge, a first side edge, and a second side edge.

3. The screen cloth of claim 2 , wherein the longitudinal ligaments extend from the front edge to the back edge.

4. The screen cloth of claim 3 , wherein the transverse ligaments extend from the first side edge to the second side edge.

5. The screen cloth of claim 4 , wherein the metal plate is made of structural steel.

6. The screen cloth of claim 5 , wherein the openings are equally sized.

7. The screen cloth of claim 6 , wherein the openings are rectangular.

8. The screen cloth of claim 1 , wherein the elastomer coating or liner coats or lines the portion of the impact surface of the metal plate prone to wear.

9. The screen cloth of claim 1 , wherein the elastomer coating or liner coats or lines both the impact surface and the bottom surface of the metal plate.

10. The screen cloth as claimed in claim 1 , wherein the elastomer coating or liner coats or lines the entirety of the metal plate.

11. The screen cloth of claim 1 , wherein the elastomer is selected from synthetic or natural rubber, polyurethane, a thermosetting elastomer, or a thermoplastic elastomer.

12. The screen cloth as claimed in claim 1 , wherein the leading edge is located on a portion of the at least one transverse ligament that is positioned between two side by side longitudinal ligaments.

13. The screen cloth of claim 1 , wherein the wear material is selected from chromium carbide, tungsten carbide, ceramic, tungsten carbide/steel composite, or sintered tungsten carbide.

14. The screen cloth of claim 13 , wherein the wear material is in the form of a rod, cylinder, sphere, tile, insert, segment or combinations thereof.

15. The screen cloth of claim 14 , wherein the wear material is in the form of one piece or multiple pieces of tile.

16. The screen cloth of claim 14 , wherein the wear material is in the form of at least one segment having an “L” or “C” shape.

17. The screen cloth of claim 2 , wherein a front wall of the screen opening is angled downwardly and outwardly relative to the front edge.

18. The screen cloth as claimed in claim 17 , wherein a corner of the leading edge of the structural metal is machined out to have a thicker elastomer coating or liner between the structural metal and the wear material.

19. A screen for use in a vibrating, rotating 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 one or more screen cloths of claim 1 .

20. A method for screening an oil sand slurry having oversize reject material, comprising:
providing a screen having a number of screen cloths, each screen cloth having an impact face and 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, the metal plate having an impact surface and a bottom surface; a coating or lining comprising an elastomer, coating or lining at least the impact surface of the metal plate or a portion thereof; and a wear material partially embedded into the elastomer coating or liner at a leading edge of the at least one transverse ligament relative to the direction of the material flow, such that a portion of the wear material is exposed on the impact face of the screen cloth to prevent the elastomer at the leading edge from tearing or gouging by the flow of the material; 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 pass over the screen cloth.

Assignees

• Syncrude Canada Ltd
• Syncrude Canada Ltd

Inventors

• Moon Soon Won
• Obaia Khaled
• Reid Damien

Classifications

• B07B1/4618 Primary

  Manufacturing of screening surfaces · CPC title

• B07B1/4672 Primary

  Woven meshes · CPC title

• B07B1/28

  Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens · CPC title

• B07B1/469

  Perforated sheet-like material · CPC title