WARNING DEVICE FOR MONITORING A HEALTH STATUS OF A BEARING MOUNTED TO A PIECE OF ROTATING INDUSTRIAL MACHINERY

• US 20150015405A1
• Filed: 11/30/2012
• Published: 01/15/2015
• Est. Priority Date: 12/20/2011
• Status: Abandoned Application

• Current Assignee: ABet SKF
• Original Assignee: ABet SKF
• Inventors: Bark, Torsten, Murphy, Jonathan David
• Application Number:
  US14/366,535
• Publication Number:
  US 20150015405A1
• Time in Patent Office: Days
• US Class Current: 340/682
• CPC Class Codes: F16C 19/525 related to temperature and heat, e.g. insulation
• CPC Class Codes: F16C 19/527 related to vibration and noise
• CPC Class Codes: F16C 2202/36 Piezoelectric
• CPC Class Codes: F16C 2233/00 Monitoring condition, e.g. temperature, load, vibration
• CPC Class Codes: F16C 2360/00 Engines or pumps in general F01 - F04
• CPC Class Codes: F16C 41/008 Identification means, e.g. markings, RFID-tags; Data transfer means
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01M 13/04 Bearings
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis
• CPC Class Codes: G01P 15/00 Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C
• CPC Class Codes: G08B 21/187 Machine fault alarms

Abstract

A warning device and for monitoring a health status of a bearing mounted to a piece of rotating machinery is provided. The warning device includes a generally cylindrical body portion, an annular top portion, a base portion, and a battery for powering the device. The device has at least one sensor that senses one of a velocity, an enveloped acceleration and a temperature value of the bearing and at least one light emitting diode that displays the health status of the bearing according to input from one of the sensors. A mounting pad integral to the base portion allows the warning device to be mounted to rotating industrial machinery. A circuit board is disposed within the body and at least one thermally conductive circuit board trace is integrally disposed within the mounting pad. The trace conducts heat from the mounting pad to one of the at least one sensors.

Claims

1. A warning device and for monitoring a health status of a bearing mounted to a piece of rotating machinery in an industrial environment, the warning device comprising:

a generally cylindrical body portion;

an annular top portion;

a base portion;

a battery for powering the device;

at least one sensor that senses at least one of a velocity, an enveloped acceleration and a temperature value of the bearing;

at least one tri-color light emitting diode for displaying the health status of the bearing according to input from one of the at least one sensors;

a mounting pad integral to the base portion for mounting the warning device to the piece of rotating industrial machinery;

a circuit board disposed within the body; and

at least one thermally conductive circuit board trace integrally disposed within the mounting pad, the trace to conduct heat from the mounting pad to one of the at least one sensors, and wherein

the one of the at least one sensors being mounted on the circuit board; and

wherein

the device initiates a self check mode to verify its proper function after the warning device has been activated.

2. The warning device for monitoring the health status of a bearing according to claim 1, wherein the at least one sensor further comprises two temperature sensors and an acceleration sensor, the acceleration sensor being a piezo-element that provides an acceleration signal, which is then processed to deliver the velocity and enveloped acceleration overall.

3. The warning device for monitoring a health status of a bearing according to claim 1, wherein the battery provides power to the device for at least 3 years of normal operation with a single alarm detection.

4. The warning device for monitoring a health status of a bearing according to claim 1, wherein the mounting pad is hexagonal in shape and has at least two flat surfaces for tightening the warning device with a tool.

5. The warning device for monitoring a health status of a bearing according to claim 1, wherein the at least one tri-color light emitting diode is mounted on an upper top surface of the warning device for maximum visibility to a user.

6. The warning device for monitoring a health status of a bearing according to claim 1, wherein one of the at least one tri-color light emitting diode illuminates green when the device passes its self check mode.

7. The warning device for monitoring a health status of a bearing according to claim 1, wherein one of the at least one light emitting diodes illuminates amber when the device fails the self check mode.

8. The warning device for monitoring a health status of a bearing according to claim 1, wherein the device wakes up a predetermined number of times over a 24 hour period in order to check if the industrial machine is in operation.

9. The warning device for monitoring a health status of a bearing according to claim 8, wherein after waking up, at least one sensor evaluation of at least one of the velocity and enveloped acceleration and current temperature level of the industrial rotating machine is initiated, and wherein

the device goes into an alarm mode when the machine evaluation meets a minimum threshold, and wherein

one of the at least one tri-color light emitting diodes illuminates red after the alarm mode is verified.

10. The warning device for monitoring a health status of a bearing according to claim 8, further comprising after waking up, at least one sensor evaluation of the at least one of the velocity and enveloped acceleration and current level of the machine is initiated, and wherein

the device goes back into a sleep mode to conserve power when the machine evaluation does not meet a minimum threshold.

11. The warning device for monitoring a health status of a bearing according to claim 9, further comprising waking up a more frequent predetermined number of times after an alarm condition is verified.

12. The warning device for monitoring a health status of a bearing according to claim 9, wherein one of the at least one tri-color light emitting diodes blinks red for one week after an alarm condition is verified.

13. The warning device for monitoring a health status of a bearing according to claim 1, wherein one of the at least one tri-color light emitting diodes blinks red for 10 seconds after a magnetic key is applied to and read by the warning device.

14. The warning device for monitoring a health status of a bearing according to claim 1, wherein a range in velocity of 10-1000 KHz is within one of the at least one the sensors sensing range.

15. The warning device for monitoring a health status of a bearing according to claim 1, wherein a range in machine rotational speed of 900-3600 rpm and maximum enveloped acceleration is 30 gE is within one of the at least one sensors sensing range.

16. The warning device for monitoring a health status of a bearing according to claim 1, wherein a stage 3 bearing defect can be detected prior to a catastrophic failure.

17. The warning device for monitoring a health status of a bearing according to claim 1, wherein the acceleration sensor is a piezo-element that provides an acceleration signal, processed to deliver the velocity and enveloped acceleration.

18. The warning device for monitoring a health status of a bearing according to claim 5, wherein the at least one tri-color light emitting diode further comprises three independently controlled translucent light emitting diodes assembled on the upper top surface of the device.

19. The warning device for monitoring a health status of a bearing according to claim 1, wherein the circuit board further comprises:

a band pass filter to filter the signal to eliminate low frequency structural machinery vibrations signals; and

a demodulator to demodulate and enhance the frequency content at a bearing defect frequency, and wherein

the band pass filter and demodulator act to improve the frequency response of the at least one acceleration sensor.

20. The warning device for monitoring a health status of a bearing according to claim 1, further comprising a bar code disposed on the warning device, and an inspection device having a bar code reader that is able to scan a bar code disposed on the device to display the health status of the bearing at a plurality of check points C.

21. The warning device for monitoring a health status of a bearing according to claim 19, wherein the check point is one of a plurality of check points C_n on a predetermined route, and the bar code is one of a plurality of bar codes on a plurality of warning devices to be inspected, and wherein

the inspection provides an operator driven reliability that proves the plurality of warning devices have been checked by the operator.