Patent US3905417A successfully refreshed from Google Patents.
US3905417A
Expired / Lapsed
US
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Electromagnetic rabbling mechanism for continuously pouring molten metal
Assignee: Compagnie Electro Mecanique SA
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Filing: 1973-12-06
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Granted: 1975-09-16
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Expires: 1993-12-06
Abstract
Abstract An electromagnetic rabbling mechanism associated with continuously poured molten metal forming an ingot comprises an inductor coil mounted on a stationary annular laminated magnetic structure providing a rotating magnetic field which surrounds the slowly descending column of solidifying metal and induces rotation of the central and still liquid metal within the solidified outer crust portion of the ingot. Cooling of the inductor coil and its rotary magnetic field producing structure is effected by immersion thereof within a water-filled annular tank co-axially surrounding the descending metal column, the water or other liquid coolant being continuously circulated through the tank along a path designed to establish an optimum amount of heat transfer contact surfaces with all exposed parts of the magnetic structure and the coil.
Inventors
- 👤 Jean Delassus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:18
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/12; B22D11/122
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
252 words
A liquid-cooled electromagnetic rabbling mechanism associated with a continuously poured and descending column of molten metal forming an ingot which comprises an annular cooling tank adapted to co-axially surround the descending column of metal, an annular laminated magnetic structure located co-axially within said cooling tank and having a cylindric array of axially extending coil-receiving slots located at the inner periphery thereof, an inductor coil located in said slots, said inductor coil being constituted by a winding of an electrical conductor covered by a sheath which is impermeable to the liquid coolant, a lead-out structure from the terminal ends of said coil through the wall of said cooling tank to an energizing source thereby enabling production of a rotating magnetic field which induces rotation of the centrally located and still molten metal within the outer crust portion of the ingot being formed, and means for effecting forced circulation of a liquid coolant through said tank which includes means establishing a flow path therefor which provides passage of the coolant from an inlet downwardly through an annular passage provided between the outer wall of said tank and the outer periphery of said annular magnetic structure to The bottom of the coil, thence inwardly to the inner periphery of said annular magnetic structure, thence upwardly through said slots and an annular passage provided between the inner periphery of said annular magnetic structure and the inner wall of said tank to the top of the coil, and thence outwardly from said tank through a discharge outlet.
Claim 2
Dependent Claim
252 words
A liquid-cooled electromagnetic rabbling mechanism associated with a continuously poured and descending column of molten metal forming an ingot which comprises an annular cooling tank adapted to co-axially surround the descending column of metal, an annular laminated magnetic structure located co-axially within said cooling tank and having a cylindric array of axially extending coil-receiving slots located at the inner periphery thereof, an inductor coil located in said slots, said inductor coil being constituted by a winding of an electrical conductor covered by a sheath which is impermeable to the liquid coolant, a lead-out structure from the terminal ends of said coil through the wall of said cooling tank to an energizing source thereby enabling production of a rotating magnetic field which induces rotation of the centrally located and still molten metal within the outer crust portion of the ingot being formed, and means for effecting forced circulation of a liquid coolant through said tank which includes means establishing a flow path therefor which provides passage of the coolant from an inlet downwardly through an annular passage provided between the outer wall of said tank and the outer periphery of said annular magnetic structure to The bottom of the coil, thence inwardly to the inner periphery of said annular magnetic structure, thence upwardly through said slots and an annular passage provided between the inner periphery of said annular magnetic structure and the inner wall of said tank to the top of the coil, and thence outwardly from said tank through a discharge outlet.
Claim 3
Dependent Claim
81 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 1 wherein said annular laminated magnetic structure includes clamping plates at the upper and lower ends thereof, said lower clamping plate including radially extending passages therein for directling the liquid coolant radially inward to the inner periphery of said annular magnetic structure and said upper clamping plate including a multiplicity of through-holes to prevent formation of air pockets in the upper annular space between said tank and said annular laminated magnetic structure.
Claim 4
Dependent Claim
41 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 1 wherein the conductor from which said inductor coil is wound has a flexible characteristic and is constituted by stranded cable covered by the sheath of material impermeable to the liquid coolant.
Claim 5
Dependent Claim
36 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 3 wherein said flexible stranded cable which forms the coil conductor has a circular cross-section of 6mm in diameter and includes a 3 mm diameter copper core.
Claim 6
Dependent Claim
42 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 1 wherein said tank includes a junction neck and a transversely extending insulator plate therein through which are passed and supported the lead-out terminal structures for the various parts of said inductor coil.
Claim 7
Dependent Claim
93 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 5 wherein the lead-out structures for the various conductor members of said inductor coil include massive parts of conductive material including bores for receiving and connection by soldering of the bared ends of the conductor parts, heat shrinkable sleeves enclosing and sealing off the connections between the conductor ends and said bored massive parts, said sealed-off connections being immersed in a potting resin and covered by an insulating sleeve the end of which is embedded in a corresponding groove provided in said insulator plate.
Claim 8
Dependent Claim
63 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 6 wherein said massive conductor part includes a threaded stem portion projecting through said insulator plate and secured thereto by a nut, said stem portion establishing a shouldered portion and a sealing ring surrounding said stem portion and which forms a seal between said shouldered portion and the adjacent surface of said insulator plate.
Claim 9
Dependent Claim
39 words
A liquid-cooled electromagnetic rabbling mechanism as defined in claim 1 wherein said annular tank is sectionalized into upper and lower parts which are disconnectible to permit removal of the upper part for access to the interior of the tank.
References Cited (Backward Citations)
US2877525A
Cited
US3056071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |