Method and Apparatus for Bearing Thrust Monitoring

• US 20110197420A1
• Filed: 04/25/2011
• Published: 08/18/2011
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: Flsmidth A/S (Flsmidth & Company A/S)
• Original Assignee: Phillips Kiln Services Ltd.
• Inventors: Gebhart, Walter M.
• Granted Patent: US 8,485,052 B2
• Time in Patent Office: Days
• US Class Current: 29/428
• CPC Class Codes: F16C 13/04 Bearings with only partial enclosure of the member to be borne; Bearings with local support at two or more points
• CPC Class Codes: F16C 19/507 with rolling elements journaled in one of the moving parts, e.g. stationary rollers to support a rotating part
• CPC Class Codes: F27B 7/20 Details, accessories, or equipment peculiar to rotary-drum furnaces
• CPC Class Codes: F27B 7/2206 Bearing rings
• CPC Class Codes: F27B 7/42 Arrangement of controlling, monitoring, alarm or like devices
• CPC Class Codes: G01B 21/22 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: G01L 5/12 for measuring axial thrust in a rotary shaft, e.g. of propulsion plants
• CPC Class Codes: G01M 13/04 Bearings
• CPC Class Codes: Y10T 29/49826 Assembling or joining
• CPC Class Codes: Y10T 29/53104 Roller or ball bearing

Abstract

A method and apparatus for bearing thrust monitoring allows measurable detection of tilt of a support bearing a roller which rotatably supports a rotating body. A tilt meter adapted to measurably detect a tilt of the support bearing is coupled to the support bearing, where the tilt is defined as an angular difference in bearing orientation between a first bearing position and a second subsequent bearing position that is cause by an axial thrust on the rotary body. Once tilt is detected, the bearing orientation of the support bearing can be adjusted to return the support bearing to substantially the first bearing position.

Claims

1. A system for monitoring skew of rollers supporting a rotary body, the system comprising:

a tilt sensor configured to be mounted to a bearing structure for a first roller of the rollers in a manner that does not modify the bearing structure, wherein the bearing structure is selected from the group consisting of a bearing for the first roller, a housing assembly of the bearing, and a support frame for the bearing; and

a processor configured to communicate with the tilt sensor, and further configured to monitor angular differences in bearing orientations with the tilt sensor, wherein each of the bearing orientations is about a vertical axis between a first position of the bearing and a second subsequent position of the bearing that is caused by an axial thrust load on the rotary body.

2. The system of claim 1, wherein the tilt sensor comprises an electrolytic tilt sensor.

3. The system of claim 1, and further comprising an electrical wire operably interconnecting the tilt sensor and the processor.

4. The system of claim 1, wherein the tilt sensor is further configured to be unmounted from the bearing structure in a manner that does not modify the bearing structure.

5. The system of claim 1, and further comprising a second tilt sensor configured to be mounted to a second bearing structure for a second roller of the rollers, wherein the second tilt sensor is configured to be mounted to the second bearing structure in a manner that does not modify the second bearing structure, and wherein the second bearing structure is selected from the group consisting of a second bearing for the second roller, a housing assembly of the second bearing, and a support structure for the second bearing.

6. The system of claim 5, wherein the processor is further configured to communicate with the second tilt sensor, and to monitor angular differences in second bearing orientations of the second bearing with the second tilt sensor, wherein each of the second bearing orientations is about a vertical axis between a first position of the second bearing and a second subsequent position of the second bearing that is caused by the axial thrust load on the rotary body.

7. The system of claim 1, wherein the rotary body comprises a rotary kiln.

8. The system of claim 1, wherein the processor is further configured to derive a direction of the axial thrust load as a function of the monitored angular differences in bearing orientations.

9. A method for monitoring skew of rollers supporting a rotary body, the method comprising:

mounting a tilt sensor to a bearing structure for a first roller of the rollers in a manner that does not modify the bearing structure, wherein the bearing structure is selected from the group consisting of a bearing for the first roller, a housing assembly of the bearing, and a support frame for the bearing; and

measurably detecting angular difference in bearing orientation with the tilt sensor about a vertical axis between a first position of the bearing and a second subsequent position of the bearing that is caused by an axial thrust load on the rotary body.

10. The method of claim 9, and further comprising unmounting the tilt sensor in a manner that does not modify the bearing structure.

11. The method of claim 9, and further comprising providing an output signal from the tilt sensor to a processor, wherein the output signal is based on the measurably detected angular difference in bearing orientation.

12. The method of claim 9, and further comprising deriving a direction of the axial thrust load as a function of the measurably detected angular difference in bearing orientation.

13. The method of claim 9, wherein the rotary body comprises a rotary kiln.

14. A method for reducing skew of rollers supporting a rotary body, the method comprising:

mounting a tilt sensor to a bearing structure for a first roller of the rollers in a manner that does not modify the bearing structure, wherein the bearing structure is selected from the group consisting of a bearing for the first roller, a housing assembly of the bearing, and a support frame for the bearing;

measuring a first inclination of the bearing with the tilt sensor;

generating an axial thrust load on the rotary body;

measuring a second inclination of the bearing with the tilt sensor while generating the axial thrust load on the rotary body; and

performing a skew adjustment on the first roller to reduce a difference between the first inclination and the second inclination.

15. The method of claim 14, wherein measuring the first inclination of the bearing with the tilt sensor comprises:

detecting a tilt with the tilt sensor at the first inclination; and

providing an output signal from the tilt sensor to a processor, wherein the output signal is based on the detected tilt with the tilt sensor.

16. The method of claim 14, and further comprising unmounting the tilt sensor in a manner that does not modify the bearing structure.

17. The method of claim 14, wherein the tilt sensor comprises an electrolytic tilt sensor.

18. The method of claim 14, wherein the rotary body comprises a rotary kiln.

19. The method of claim 14, and further comprising:

mounting a second tilt sensor to a second bearing structure for a second roller of the rollers in a manner that does not modify the second bearing structure, wherein the second bearing structure is selected from the group consisting of a second bearing for the second roller, a housing assembly of the second bearing, and a support frame for the second bearing;

measuring a first inclination of the second bearing with the second tilt sensor;

measuring a second inclination of the second bearing with the second tilt sensor while generating the axial thrust load on the rotary body; and

performing a skew adjustment on the second roller to reduce a difference between the first and second inclinations of the second bearing.

20. The method of claim 19, and further comprising:

monitoring first output signals with a processor, the first output signals being based on the first and second inclinations of the bearing; and

monitoring second output signals with the processor, the second output signals being based on the first and second inclinations of the second bearing.