Portable press vibration severity monitoring system and method

• US 6,209,400 B1
• Filed: 10/24/1997
• Issued: 04/03/2001
• Est. Priority Date: 01/13/1997
• Status: Expired due to Term

• Current Assignee: The Minster Machine Company (Nidec Corporation)
• Original Assignee: The Minster Machine Company (Nidec Corporation)
• Inventors: Schroeder, David, Ever, Kevin J., Klein, Robert E., Schoch, Daniel A.
• Primary Examiner(s): NOORI, MAX H
• Application Number:
  US08/957,047
• Time in Patent Office: 1,257 Days
• Field of Search: 73/588, 73/597, 73/598, 73/602, 73/649, 73/778, 73/774
• US Class Current: 73/778
• CPC Class Codes: B30B 15/28 Arrangements for preventing distortion of, or damage to, presses or parts thereof
• CPC Class Codes: G01D 21/02 Measuring two or more variables by means not covered by a single other subclass

Abstract

The invention is directed to a hand held device attachable to a mechanical press to measure press conditions. The device includes signal processing circuitry for processing a corresponding signal developed from an accelerometer. The signal processing circuitry has acceleration processing circuitry for calculating a press acceleration signal, a velocity processing circuitry for calculating a press velocity signal, and displacement processing circuitry for calculating a press displacement signal. Display circuitry is used for displaying at least one of said calculated signals. A multi-contact switch connect the acceleration, velocity, and displacement processing circuitry together permitting an operator to select one of the calculated signals for input to the display circuitry. A method of utilization of the device is also described.

Claims

1. A hand held device attachable to a mechanical press to measure press conditions including vibration severity zone, said device comprising:

an accelerometer for measuring press conditions and creating a corresponding signal;

a hand held signal processing means for processing said corresponding signal, said signal processing means connected to said accelerometer to process said corresponding signal, said signal processing means comprising;

an acceleration processing means for calculating a press acceleration signal;

a velocity processing means for calculating a press velocity signal;

a displacement processing means for calculating a press displacement signal;

a highpass filter, said highpass filter forming a part of said velocity processing means, said highpass filter having a frequency band whereby lower frequency signals are removed to prevent interference of press inertia effects when measuring the vibration severity zone of the press;

a display means for displaying at least one of said calculated signals; and

a switch connecting said acceleration, velocity, and displacement processing means together and permitting an operator to select one of said calculated signals for input to said display means.

2. The device of claim 1 in which said display means comprises a means for measuring the voltage of said calculated signals and displaying said voltage representing a press condition.

3. The device of claim 1 in which said display means includes a plurality of LED'"'"'s arranged to illuminate at separate predefined applied voltage ranges whereby an illuminated LED represents a particular range for a signal input to said display means.

4. The device of claim 3 in which said LED'"'"'S illuminate in different colors depending on the predefined applied voltage range.

5. The device of claim 1 in which said acceleration processing means includes a first order highpass filter.

6. The device of claim 1 in which said velocity processing means comprises a signal integrator, a first order highpass filter, a second order highpass filter, and a first order highpass filter in series.

7. The device of claim 1 in which said displacement processing means comprises a signal integrator, a first order highpass filter, a second order highpass filter, a second signal integrator, and a second first order highpass filter in series.

8. The device of claim 1 in which said signal processing means includes a second order low pass filter that reduces high frequency signals applied to said display means.

9. The device of claim 1 in which said frequency band of said highpass filter is above approximately 30 hertz.

10. A method of monitoring vibration severity levels in a press comprising:

providing a hand held monitoring device that visually indicates press vibration severity levels in zone wise fashion;

attaching a press sensor to said press;

connecting said press sensor to said monitoring device;

running the press; and

determining the vibration severity level based on the zone wise visual indicator on said monitoring device.

11. The method of claim 10, wherein said press sensor is an accelerometer.

12. A hand held device attachable to a mechanical press to measure press conditions from a press accelerometer corresponding signal, the measured press conditions including vibration severity zone, said device comprising:

a hand held signal processing means for processing said corresponding signal said signal processing means in communication with the accelerometer to process said corresponding signal, said signal processing means comprising;

an acceleration processing means for calculating a press acceleration signal;

a velocity processing means for calculating a press velocity signal;

a displacement processing means for calculating a press displacement signal;

a highpass filter, said highpass filter forming a part of said velocity processing means, said highpass filter having a frequency band whereby lower frequency signals are removed to prevent interference of press inertia effects when measuring the vibration severity zone of the press;

a display means for displaying at least one of said calculated signals; and

a switch connecting said acceleration, velocity, and displacement processing means together and permitting an operator to select one of said calculated signals for input to said display means.

13. The device of claim 12 in which said display means comprises a means for measuring the voltage of said calculated signals and displaying said voltage representing a press condition.

14. The device of claim 12 in which said display means includes a plurality of LED'"'"'s arranged to illuminate at separate predefined applied voltage ranges whereby an illuminated LED represents a particular range for a signal input to said display means.

15. The device of claim 14 in which said LED'"'"'s illuminate in different colors depending on the predefined applied voltage range.

16. The device of claim 12 in which said acceleration processing means includes a first order highpass filter.

17. The device of claim 12 in which said velocity processing means comprises a signal integrator, a first order highpass filter, a second order highpass filter, and a first order highpass filter in series.

18. The device of claim 12 in which said displacement processing means comprises a signal integrator, a first order highpass filter, a second order highpass filter, a second signal integrator, and a second first order highpass filter in series.

19. The device of claim 12 in which said signal processing means includes a second order low pass filter that reduces high frequency signals applied to said display means.

20. The device of claim 12 in which said frequency band of said highpass filter is above approximately 30 hertz.

21. A hand held device attachable to a mechanical press to measure press conditions from a press accelerometer corresponding signal, said device comprising:

a hand held signal processing means for processing said corresponding signal said signal processing means in communication with the accelerometer to process said corresponding signal, said signal processing means comprising;

an acceleration processing means for calculating a press acceleration signal;

a velocity processing means for calculating a press velocity signal;

a highpass filter, said highpass filter forming a part of said velocity processing means, said highpass filter having a frequency band whereby lower frequency signals are removed to prevent interference of press inertia effects when measuring the vibration severity zone of the press;

a display means for displaying at least one of said calculated signals; and

a switch connecting said acceleration and velocity processing means together and permitting an operator to select one of said calculated signals for input to said display means.

22. The device of claim 21 in which said display means comprises a means for measuring the voltage of said calculated signals and displaying said voltage representing a press condition.

23. The device of claim 21 in which said display means includes a plurality of LED'"'"'s arranged to illuminate at separate predefined applied voltage ranges whereby an illuminated LED represents a particular range for a signal input to said display means.

24. The device of claim 23 in which said LED'"'"'s illuminate in different colors depending on the predefined applied voltage range.

25. The device of claim 21 further including a time filtered RMS conversion means to convert said velocity signal to an indication of press vibration severity.

26. A device for monitoring the long-term reliability condition of a press, said device comprising:

an accelerometer for measuring press conditions and creating a corresponding signal;

a hand held signal processing means for processing said corresponding signal, said signal processing means connected to said accelerometer to process said corresponding signal, said signal processing means comprising a means for monitoring and calculating the vibration severity magnitude velocity induced in the press and the vibration severity zone corresponding to the vibration severity magnitude velocity; and

a display means for displaying said vibration severity magnitude velocity.

27. The device of claim 26 in which said display means includes a plurality of light emitting diodes that illuminate depending on in which vibration severity zone said calculated vibration severity magnitude velocity falls.