US4048556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for evaluating electrode consumption rate
Assignee: Deere and Co
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Filing: 1976-03-31
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Granted: 1977-09-13
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Expires: 1996-03-31
Abstract
Abstract A method for determining the expected consumption rate of graphite electrodes is disclosed. An electrical signal is applied to a number of electrodes to generate eddy currents therein which are sensed to provide eddy current values. The consumption rate of the electrodes in use in an electric arc metallurgical furnace are measured. A standard eddy current value (with respect to the measured consumption rates) is determined, for example, by plotting the eddy current values and measured consumption rates. Thereafter, eddy current values obtained from other electrodes are compared with the standard eddy current value to determine the expected consumption rate.
Inventors
- 👤 Maurice P. Roach
- 👤 Stanley L. Strudthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:35
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A method of determining the approximate consumption rate of a plurality of graphite electrodes which comprises: applying an electrical signal to a number of the plurality of graphite electrodes to generate eddy currents in said electrodes; sensing the generated eddy current to obtain eddy current values; using said number of electrodes in an electric arc furnace and measuring the consumption rate of each of the said number of electrodes during said use; determining a standard correlation between eddy current values and the said measured consumption rates; and comparing the eddy currents values obtained from the remaining plurality of graphite electrodes with the standard eddy current correlation value to determine the approximate consumption rate thereof.
Claim 2
Independent Claim
114 words
A method of determining the approximate consumption rate of a plurality of graphite electrodes which comprises: applying an electrical signal to a number of the plurality of graphite electrodes to generate eddy currents in said electrodes; sensing the generated eddy current to obtain eddy current values; using said number of electrodes in an electric arc furnace and measuring the consumption rate of each of the said number of electrodes during said use; determining a standard correlation between eddy current values and the said measured consumption rates; and comparing the eddy currents values obtained from the remaining plurality of graphite electrodes with the standard eddy current correlation value to determine the approximate consumption rate thereof.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the said electrical signals are applied to a flat section of the electrode.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the said electrical signals are applied along the length of the electrode.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the said standard eddy current value is obtained by plotting the eddy current values and consumption rates of said number of electrodes.
Claim 6
Independent Claim
72 words
A method of testing a graphie electrode for expected consumption rate in an electric arc furnace which comprises: applying an electrical signal to a portion of the said graphite electrode to generate eddy currents therein; sensing the generated eddy currents to obtain an eddy current value; comparing the obtained eddy current value with a standard representing the correlation between eddy current values and consumption rate to determine the expected consumption rate thereof.
Claim 7
Independent Claim
72 words
A method of testing a graphie electrode for expected consumption rate in an electric arc furnace which comprises: applying an electrical signal to a portion of the said graphite electrode to generate eddy currents therein; sensing the generated eddy currents to obtain an eddy current value; comparing the obtained eddy current value with a standard representing the correlation between eddy current values and consumption rate to determine the expected consumption rate thereof.
Claim 8
Dependent Claim
29 words
The method of claim 5 wherein the standard eddy current value is obtained by establishing measured eddy current values and measured consumption rates for a number of graphite electrodes.
Claim 9
Dependent Claim
22 words
The method of claim 6 wherein all of the measured eddy current values are obtained at the same portion of the electrode.
Claim 10
Dependent Claim
19 words
The method of claim 7 wherein the portion of the electrode is a flat section on the electrode body.
Claim 11
Dependent Claim
19 words
The method of claim 7 wherein the portion of the electrode is along the length of the electrode body.
Claim 12
Dependent Claim
14 words
The method of claim 5 wherein the graphite electrode is a solid graphite electrode.
References Cited (Backward Citations)
US3170082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |