US3868094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace control systems
Assignee: Bloom Engineering Co Inc
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Filing: 1973-06-15
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Granted: 1975-02-25
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Expires: 1993-06-15
Abstract
Abstract A heating control process for a top and bottom zone metallurgical furnace includes directly measuring in one zone only the surface temperature of a workpiece passing through the furnace and then simultaneously transmitting the signal from the direct workpiece measurement to top and bottom zone controllers, each of which have a desired preset temperature. The signals from the controllers actuate a top zone motor and a bottom zone motor, respectively to drive furnace burners to maintain the desired preset temperature. The signal from the direct workpiece measurement is normally directed through a top to bottom zone temperature ratio device to compensate for the difference in requirements between the respective zones.
Inventors
- 👤 James E Hovis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:01
CPC Classifications
F; F27; F27D; F27D19/00; B; B21; B21B; B21B37/00; B21B37/74; F27B; F27B9/00; F27B9/30; F27B9/40; F27D2019/0003; F27D2019/0028; F27D2019/0034; F27D2019/004
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
In a process for hot rolling workpieces in a rolling mill and controlling the zone temperature of a multiple zone metallurgical reheating furnace in which there are top and bottom zones and in which workpieces pass through the furnace intermediate the top and bottom zones prior to rolling, the improvement comprising utilizing a direct workpiece temperature measurement as the sole primary control by: A. directly measuring the surface temperature of the workpiece in one of the top or bottom zones; B. simultaneously transmitting a signal from the direct workpiece measurement to a top zone controller and to a bottom zone controller, each of which has a desired preset temperature; and C. actuating a top zone motor and a bottom zone motor through the respective top and bottom zone controllers so as to drive furnace burners to maintain the desired preset temperatures.
Claim 2
Dependent Claim
141 words
In a process for hot rolling workpieces in a rolling mill and controlling the zone temperature of a multiple zone metallurgical reheating furnace in which there are top and bottom zones and in which workpieces pass through the furnace intermediate the top and bottom zones prior to rolling, the improvement comprising utilizing a direct workpiece temperature measurement as the sole primary control by: A. directly measuring the surface temperature of the workpiece in one of the top or bottom zones; B. simultaneously transmitting a signal from the direct workpiece measurement to a top zone controller and to a bottom zone controller, each of which has a desired preset temperature; and C. actuating a top zone motor and a bottom zone motor through the respective top and bottom zone controllers so as to drive furnace burners to maintain the desired preset temperatures.
Claim 3
Dependent Claim
177 words
In a process for hot rolling workpieces in a rolling mill and controlling the zone temperature of a multiple zone metallurgical reheating furnace in which there are top and bottom zones and respective top and bottom zone controlLers and in which workpieces pall through the furnace intermediate the top and bottom zones prior to rolling, the improvement comprising utilizing a direct rolling workpiece temperature measurement as the primary control by: A. directly measuring the surface temperature of the workpiece in one of the top or bottom zones; B. simultaneously transmitting the signal from the direct workpiece measurement to a top to bottom zone temperature ratio device while transmitting the signal to the zone controller in which the direct temperature measurement was made, said signal being appropriately altered by said device and sent on to the other zone controller, each zone controller having a desired preset temperature; and C. actuating top zone motor and a bottom zone motor through the respective top and bottom zone controllers so as to drive furnace burners to maintain the desired preset temperatures.
Claim 4
Dependent Claim
177 words
In a process for hot rolling workpieces in a rolling mill and controlling the zone temperature of a multiple zone metallurgical reheating furnace in which there are top and bottom zones and respective top and bottom zone controlLers and in which workpieces pall through the furnace intermediate the top and bottom zones prior to rolling, the improvement comprising utilizing a direct rolling workpiece temperature measurement as the primary control by: A. directly measuring the surface temperature of the workpiece in one of the top or bottom zones; B. simultaneously transmitting the signal from the direct workpiece measurement to a top to bottom zone temperature ratio device while transmitting the signal to the zone controller in which the direct temperature measurement was made, said signal being appropriately altered by said device and sent on to the other zone controller, each zone controller having a desired preset temperature; and C. actuating top zone motor and a bottom zone motor through the respective top and bottom zone controllers so as to drive furnace burners to maintain the desired preset temperatures.
Claim 5
Dependent Claim
35 words
The improvement of claim 2, the process including directing delay signals from the rolling mill to the top and bottom zone controllers to effectuate a change in the preset temperature to accommodate the mill delay.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |