Grinding mill

Patent metadata

Field	Value
Publication number	US-10967384-B2
Application number	US-201816165573-A
Country	US
Kind code	B2
Filing date	Oct 19, 2018
Priority date	Oct 19, 2018
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

An open-ended grinding mill (1) includes a drum (2) including a cylindrical shell (3), wherein the longitudinal axis (4) of the drum is arranged in a substantially horizontal position in a use position of the grinding mill (1). The drum (2) includes a first end (5) at the feed end of the shell and a second end (6) at the discharge end of the shell. The grinding mill further includes a bearing (8) supporting the drum at the second end, and a support structure (9) to connect the drum (2) to the bearing (8). The support structure is configured to provide a wall external to the shell, whereby the shell and the support structure provide a double-wall structure separating the bearing from the inside of the drum.

First claim

The invention claimed is:

1. An open-ended grinding mill comprising:
a drum comprising a cylindrical shell, wherein a longitudinal axis of the drum is arranged in a substantially horizontal position in a use position of the open-ended grinding mill, wherein the drum comprises a first end at a feed end of the cylindrical shell and a second end at a discharge end of the cylindrical shell,
a bearing supporting the drum at the second end of the drum, and
a support structure to connect the drum to the bearing,
wherein the support structure provides a wall external to the cylindrical shell, whereby the cylindrical shell and the support structure provide a double-wall structure separating the bearing from an inside of the drum.

2. The grinding mill according to claim 1 ,
wherein the cylindrical shell is formed, at least at the second end of the drum, of at least two shell segments split in a transverse direction of the drum, and
wherein the cylindrical shell and the support structure are attached to one another at the second end of the drum in such a manner, that splits of the shell segments are indexed from splits of support structure segments of the support structure.

3. The grinding mill according to claim 2 , wherein the number of support structure segments is in the range of 2 to 8 segments.

4. The grinding mill according to claim 1 , wherein the support structure comprises a journal.

5. The grinding mill according to claim 4 , wherein the support structure comprises a longitudinal part and a radial part, and wherein the longitudinal part is configured to form a counter surface for the bearing.

6. The grinding mill according to claim 5 , wherein the support structure comprises at least two support structure segments mounted to one another in such a manner, that the longitudinal part of the support structure is fully supported over its length in a direction of the longitudinal axis of the drum.

7. The grinding mill according to claim 4 , wherein the support structure has a T-shaped cross section.

8. The grinding mill according to claim 4 , wherein the support structure has a Y-shaped cross section.

9. The grinding mill according to claim 4 , wherein the support structure has an H- or semi-H-shaped cross section.

10. The grinding mill according to claim 1 , wherein the support structure comprises spheroidal graphite iron.

11. The grinding mill according to claim 1 , wherein the support structure is removably attached to the cylindrical shell.

12. The grinding mill according to claim 11 , wherein the support structure is removably attached to the cylindrical shell by bolts.

13. The grinding mill according to claim 1 , wherein the cylindrical shell comprises a first flange extending in a radial direction of the cylindrical shell at the second end of the drum and the support structure is attached to the first flange.

14. The grinding mill according to claim 1 , wherein the grinding mill is a fully open-ended grinding mill.

15. The grinding mill according to claim 1 , wherein the grinding mill is a semi-open-ended grinding mill.

16. The grinding mill according to claim 15 , wherein the grinding mill comprises a circular open pulp lifter to transport slurry to a discharge opening of the grinding mill.

17. The grinding mill according to claim 1 , wherein the support structure comprises a cast structure.

18. The grinding mill according to claim 1 , wherein the cylindrical shell is formed, at least at the second end of the drum, of at least two shell segments split in a transverse direction of the drum, and the support structure is formed of at least two support structure segments split in the transverse direction, wherein the cylindrical shell and the support structure are attached to one another at the second end of the drum in such a manner, that splits of the shell segments of the cylindrical shell are radially offset from splits of the support structure segments of the support structure.

19. The grinding mill according to claim 1 , wherein the support structure includes a plurality of arcuate, support structure segments that collectively surround the second end of the drum and protrudes longitudinally from the second end of the drum.

20. The grinding mill according to claim 1 , wherein the second end of the drum has an end face that defines a discharge opening, the support structure covering the end face.

Assignees

• Outotec Finland Oy

Inventors

• Green Nicholas
• Berger Brian
• Bordi Damon
• Winther Kjell
• Holshagen Bjoern

Classifications

• B02C17/181 Primary

  Bearings specially adapted for tumbling mills · CPC title

• B02C17/183

  Feeding or discharging devices · CPC title

• B02C17/04

  with unperforated container · CPC title