DEFORMABLE/INFLATABLE WEAR LINER

• US 20090020391A1
• Filed: 07/19/2007
• Published: 01/22/2009
• Est. Priority Date: 07/19/2007
• Status: Active Grant

• Current Assignee: Alcan Incorporated (Rio Tinto Limited)
• Original Assignee: Alcan Incorporated (Rio Tinto Limited)
• Inventors: McKeough, Wayne
• Granted Patent: US 7,588,134 B2
• Time in Patent Office: Days
• US Class Current: 193/25.B
• CPC Class Codes: B65G 11/166 for bulk
• CPC Class Codes: B65G 11/206 for bulk

Abstract

A deformable/inflatable wear liner is attached to an inner surface of a wall of a granular material delivery passage. Pressurized air may be introduced into a space between the wall and the wear liner to inflate the wear liner, thereby preventing solids from building up in the passage.

Claims

1. A method for preventing solids from building up in a granular material delivery passage during a material delivery operation, the passage including at least a wall and a deformable wear liner provided on an inner surface of the wall for directing granular materials sliding on the wear liner, the method comprising:

a) introducing a pressurized fluid flow into a space between the inner surface of the wall and the deformable wear liner to deform the wear liner, thereby causing a profile change of a cross-section of the granular material delivery passage.

2. The method as defined in claim 1 further comprising:

b) releasing fluid pressure from the space between the inner surface of the wall and the deformable wear liner in order to allow the deformed wear liner to return to an original state, resulting in a profile recovery of the cross-section of the granular material delivery passage.

3. The method as defined in claim 2 wherein steps a) and b) are repeated during the material delivery operation.

4. The method as defined in claim 2 wherein steps a) and b) are conducted in alternating periods of time, the period of time for step a) being smaller than the period of time for step b).

5. The method as defined in claim 4 wherein steps a) and b) are conducted alternately in each of a plurality of segments of the deformable wear liner to allow each segment of the deformable wear liner to be repeatedly deformed and to return to the original state.

6. The method as defined in claim 5 wherein alternately repeating steps a) and b) in the respective segments of the deformable wear liner, is conducted simultaneously.

7. The method as defined in claim 5 wherein alternately repeating steps a) and b) in the respective segments of the deformable wear liner, is conducted on a rotating basis.

8. A chute for a material handling system bearing granular materials, the chute comprising:

at least one wall;

a deformable wear liner having a wear-resistant surface, the deformable wear liner being attached to at least a section of the wall so as to allow pressurized fluid to be introduced into a space between the deformable wear liner and the wall in order to inflate the deformable wear liner; and

means for introducing and discharging pressurized fluid into and from the space between the deformable wear liner and the wall, respectively.

9. The chute as defined in claim 8 wherein the wall is of a metal material and the section of the wall is substantially flat.

10. The chute as defined in claim 8 wherein the deformable wear liner comprises at least one flexible substrate with a plurality of side-by-side wear-resistant tiles embedded in one side of the substrate.

11. The chute as defined in claim 8 wherein the deformable wear liner comprises at least one poly ceramic sheet which includes an elastomer substrate with a plurality of ceramic tiles fixed to a side of the elastomer substrate.

12. The chute as defined in claim 11 wherein the at least one poly ceramic sheet is bonded at a peripheral edge to the wall by an adhesive.

13. The chute as defined in claim 8 wherein the deformable wear liner comprises a plurality of poly ceramic sheets, each of the poly ceramic sheets being bonded at peripheral edges thereof to the wall in order to form a plurality of segments of the deformable wear liner, each segment being inflatable independently.

14. The chute as defined in claim 8 wherein the means comprises at least one opening extending through the section of the wall to allow pressurized fluid to be controllably introduced and discharged into and from the space between the deformable wear liner and the wall, respectively.

15. The chute as defined in claim 14 comprising means attached to the section of the wail for limiting a pressure of the pressurized fluid to a predetermined level.

16. The chute as defined in claim 13 wherein the means comprises a plurality of openings extending through the section of the wall, each opening being in communication with a space between the wall and one of the segments of the deformable wear liner.

17. A granular material handling system comprising:

a chute including a chute wall and a deformable wear liner within the chute, the deformable wear liner being attached to an inner surface of a section of the chute wall so as to allow pressurized air to be introduced into a space between the wear liner and the chute wall in order to inflate the wear liner;

a source of pressurized air;

a tube connected between the source of pressurized air and the space between the chute wall and the wear liner for delivery of pressurized air to inflate the wear liner; and

a control apparatus for controllably inflating the wear liner and discharging pressurized air from the space between the chute wall and the wear liner, respectively.

18. The system as defined in claim 17 wherein the apparatus comprises a switch device for alternately allowing and terminating a pressurized air flow from the source of pressurized air to the space between the chute wall and the wear liner.

19. The system as defined in claim 18 wherein the apparatus comprises a valve for selectively discharging pressurized air from the space between the chute wall and the wear liner.