Patent US5736054A successfully refreshed from Google Patents.
US5736054A
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Method of determining values of operating parameters of a centrifuge
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1995-02-01
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Granted: 1998-04-07
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Expires: 2015-02-01
Abstract
Abstract An operating parameter of a centrifuge is determined by converting vibration of the machine frame of the centrifuge on rotation of the drum thereof to electrical signals having a frequency spectrum which is analyzed. Variations of the peak amplitudes and frequency locations on frequency analysis, e.g. by Fast Fourier Transmissions, is used to signal the parameter, e.g. a parameter representing the degrees of filling the centrifuge, termination of filtration, etc.
Inventors
- 👤 Johann Feller
- 👤 Bruno Hegnauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:13
CPC Classifications
B; B04; B04B; B04B11/00; B04B11/04; B04B11/043; G; G01; G01F; G01F23/00; G01F23/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A method of determining an operating parameter of a centrifuge selected from a degree of solids filling and a degree of liquid filling, comprising the steps of: (a) supplying a centrifuge with a suspension of solids in a liquid, and driving said centrifuge to discharge liquid of said suspension and collect said solids; (b) detecting vibration of said centrifuge resulting from rotation of a centrifuge rotor and producing electrical signals of a frequency and amplitude representing said vibration and having a frequency spectrum characteristic of operation of said centrifuge, presence and absence of said suspension, and characteristics of said liquid and solids in said centrifuge; (c) subjecting said electrical signals to a frequency spectrum analysis and isolating from said frequency spectrum by said analysis a certain selected frequency; and (d) determining said parameter selected from a degree of solids filling and a degree of liquid filling by evaluating a change in amplitude of said certain selected frequencies over a time interval.
Claim 2
Independent Claim
161 words
A method of determining an operating parameter of a centrifuge selected from a degree of solids filling and a degree of liquid filling, comprising the steps of: (a) supplying a centrifuge with a suspension of solids in a liquid, and driving said centrifuge to discharge liquid of said suspension and collect said solids; (b) detecting vibration of said centrifuge resulting from rotation of a centrifuge rotor and producing electrical signals of a frequency and amplitude representing said vibration and having a frequency spectrum characteristic of operation of said centrifuge, presence and absence of said suspension, and characteristics of said liquid and solids in said centrifuge; (c) subjecting said electrical signals to a frequency spectrum analysis and isolating from said frequency spectrum by said analysis a certain selected frequency; and (d) determining said parameter selected from a degree of solids filling and a degree of liquid filling by evaluating a change in amplitude of said certain selected frequencies over a time interval.
Claim 3
Dependent Claim
17 words
The method defined in claim 1 wherein the frequency spectrum analysis is a fast Fourier transform analysis.
Claim 4
Dependent Claim
23 words
The method as defined in claim 2 wherein an amplitude of said certain frequency is compared with an amplitude of a predetermined frequency.
Claim 5
Dependent Claim
29 words
The method defined in claim 2 wherein steps (b) and (c) are repeated and a change in amplitude of said certain selected frequency is detected for determining said parameter.
References Cited (Backward Citations)
DE1532676A1
Cited
DE1951574A1
Cited
DE2709569A1
Cited
GB1507742A
Cited
US4267734A
Cited
DE3241624A1
Cited
GB2130371A
Cited
US4522620A
Cited
GB2146130A
Cited
DE3331966A1
Cited
DE3726227A1
Cited
US4900453A
Cited
DE3925198A1
Cited
EP0456861A1
Cited
DE4004584A1
Cited
DE4041923A1
Cited
DE4227291A1
Cited
EP0724912A1
Cited
DE4334939A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-06 | 2001-10-06 | 2002-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-06 | 2005-10-06 | 2006-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-06 | 2009-10-06 | 2010-04-07 | $7700.00 | Window Closed / Lapsed |