Segmented rotor cap assembly

• US 10,697,117 B2
• Filed: 11/09/2015
• Issued: 06/30/2020
• Est. Priority Date: 11/19/2014
• Status: Active Grant

• Current Assignee: Andritz Incorporated
• Original Assignee: Andritz Incorporated
• Inventors: Gingras, Luc, Michel, Tobias
• Primary Examiner(s): Self, Shelley M
• Assistant Examiner(s): Bapthelus, Smith Oberto
• Application Number:
  US14/936,524
• Publication Number:
  US 20160138220A1
• Time in Patent Office: 1,695 Days
• Field of Search: 2412613, 241298
• CPC Class Codes: D21D 1/30 Disc mills
• CPC Class Codes: D21D 1/306 Discs

Abstract

A rotor cap assembly has been conceived using multiple wedge-shaped rotor cap segments, in which the cap segments are disposed on a cap segment retainer and in which the cap segment retainer pilots the multiple rotor cap segments at a diameter intermediate the cap segments'"'"' outer diameter and the cap segments'"'"' middle diameter. By piloting multiple rotor cap segments with retaining means on the cap segment retainer and positioning means on the multiple cap segments, the rotor cap segments and cap segment retainer assembly may be fixed to a plate holder or directly to a rotor disc of a refiner without substantially altering either the plate holder or the rotor disc.

Claims

1. A rotor cap assembly comprising:

multiple rotor cap segments configured to be disposed radially inward of refiner plate segments of a refiner, each rotor cap segment having a front side, a back side, a rotor cap segment inner diameter, a rotor cap segment outer diameter, and positioning means on the back side of each rotor cap segment; and

a cap segment retainer configured to be engaged to a rotor through pre-existing fixing holes in the rotor, the cap segment retainer having a back side and retaining means on a front side of the cap segment retainer, wherein the multiple rotor cap segments are disposed on the front side of the cap segment retainer, and wherein the retaining means engage the positioning means on the back side of each rotor cap segment such that the retaining means and the positioning means pilot the multiple rotor cap segments at a rotor cap segment diameter.

2. The rotor cap assembly of claim 1, wherein the cap segment retainer further comprises holes aligning with pre-existing holes on the rotor and fasteners extending through the cap segment retainer and through pre-existing holes in the rotor to engage the cap segment retainer to the rotor.

3. The rotor cap assembly of claim 1, wherein the cap segment retainer further comprises holes aligning with holes in a plate holder disposed between the cap segment retainer and the rotor, wherein fasteners extend through the cap segment retainer and into the plate holder.

4. The rotor cap assembly of claim 1, wherein the retaining means and the positioning means pilot the multiple rotor cap segments at the outer diameter of the multiple rotor cap segments.

5. The rotor cap assembly of claim 1, wherein a rotor cap segment of the multiple rotor cap segments further comprises a middle diameter halfway between the rotor cap segment inner diameter and the rotor cap segment outer diameter and wherein the retaining means and the positioning means pilot the rotor cap segment at an intermediate diameter between the middle diameter and the outer diameter.

6. The rotor cap assembly of claim 1, wherein a rotor cap segment of the multiple rotor cap segments further comprises a middle diameter halfway between the rotor cap segment inner diameter and the rotor cap segment outer diameter and wherein the retaining means and the positioning means pilot the rotor cap segment at an intermediate diameter between the middle diameter and the inner diameter.

7. The rotor cap assembly of claim 1, wherein the cap segment retainer is an annular cap segment retainer.

8. A rotor cap assembly comprising:

multiple rotor cap segments configured to be disposed radially inward of refiner plate segments of a refiner, each rotor cap segment having;

a front side,

a back side,

a rotor cap segment inner diameter,

a rotor cap segment outer diameter,

a rotor cap segment middle diameter located between the rotor cap inner diameter and the rotor cap outer diameter, and

a protrusion extending from the back side, wherein the protrusion has a protrusion sidewall at a side of the protrusion; and

a cap segment retainer configured to be engaged to a rotor through pre-existing holes in the rotor, the cap segment retainer having;

a back side,

a front side,

a body, and

a retaining lip extending from the front side of the cap segment retainer,

wherein the retaining lip has a retaining lip sidewall at a side of the retaining lip,

wherein a top of the retaining lip sidewall and the body of the cap segment retainer define a concave space, and

wherein the protrusion is disposed within the concave space such that the protrusion sidewall contacts the retaining lip sidewall.

9. The rotor cap assembly of claim 8, wherein the cap segment retainer further comprises holes aligning with the pre-existing holes on the rotor and fasteners extending through the cap segment retainer and through pre-existing holes in the rotor to engage the cap segment retainer to the rotor.

10. The rotor cap assembly of claim 8, wherein the cap segment retainer further comprises holes aligning with holes in a plate holder disposed between the cap segment retainer and the rotor, wherein fasteners extend through the cap segment retainer and into the plate holder.

11. The rotor cap assembly of claim 8, wherein the retaining lip sidewall contacts the protrusion sidewall to pilot a rotor cap segment of the multiple rotor cap segments at the rotor cap segment outer diameter.

12. The rotor cap assembly of claim 8, wherein the retaining lip sidewall contacts the protrusion sidewall to pilot a rotor cap segment of the multiple rotor cap segments at an intermediate diameter between the rotor cap segment outer diameter and the rotor cap segment middle diameter.

13. The rotor cap assembly of claim 8, wherein the retaining lip sidewall contacts the protrusion sidewall to pilot a rotor cap segment of the multiple rotor cap segments at an intermediate diameter between the rotor cap segment inner diameter and the rotor cap segment middle diameter.

14. The rotor cap assembly of claim 8 further comprising a central cap segment configured to be piloted on the cap segment retainer.

15. The rotor cap assembly of claim 8, wherein the cap segment retainer is an annular cap segment retainer.

16. The rotor cap assembly of claim 15, wherein the retaining lip sidewall contacts the protrusion sidewall to pilot a rotor cap segment of the multiple rotor cap segments at an intermediate diameter between the rotor cap segment outer diameter and the rotor cap segment middle diameter.

17. The rotor cap assembly of claim 16 further comprising a central cap segment having center of rotation, an outer diameter, and a central cap segment interlocking element is configured to engage a retainer interlocking element at a central cap diameter radially distal from the center of rotation.

18. The rotor cap assembly of claim 15, wherein the retaining lip sidewall contacts the protrusion sidewall to pilot a rotor cap segment of the multiple rotor cap segments at an intermediate diameter between the rotor cap segment inner diameter and the rotor cap segment middle diameter.

19. An annular rotor cap assembly comprising:

multiple rotor cap segments configured to be disposed radially inward of refiner plate segments of a refiner, each rotor cap segment having a front side, a back side, a rotor cap segment inner diameter, a rotor cap segment outer diameter, and a cap segment interlocking element; and

a cap segment retainer engaging a rotor through pre-existing holes in the rotor, the cap segment retainer having a back side, a front side, and a retainer interlocking element, wherein the cap segment interlocking element engages the retainer interlocking element at a rotor cap segment diameter radially distal from the rotor cap segment inner diameter.

20. The rotor cap assembly of claim 19, wherein the cap segment retainer further comprises holes aligning with the pre-existing holes on the rotor and fasteners extending through the cap segment retainer and through pre-existing holes in the rotor to engage the cap segment retainer to the rotor.

21. The rotor cap assembly of claim 19, wherein the cap segment retainer further comprises holes aligning with holes in a plate holder disposed between the cap segment retainer and the rotor, wherein fasteners extend through the cap segment retainer and into the plate holder.

22. The rotor cap assembly of claim 19, wherein the cap segment interlocking element and the retainer interlocking element define an interlocking mechanism and wherein the interlocking mechanism pilots a rotor cap segment of the multiple rotor cap segments at an intermediate diameter between the rotor cap inner diameter and the rotor cap outer diameter.

23. The rotor cap assembly of claim 19, wherein the cap segment retainer is an annular cap segment retainer.

24. The rotor cap assembly of claim 19 further comprising fasteners configured to engage the multiple rotor cap segments and the cap segment retainer to a rotor.