US3743749A - Electric slag refining plant - Google Patents

Electric slag refining plant Download PDF

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Publication number
US3743749A
US3743749A US00265638A US3743749DA US3743749A US 3743749 A US3743749 A US 3743749A US 00265638 A US00265638 A US 00265638A US 3743749D A US3743749D A US 3743749DA US 3743749 A US3743749 A US 3743749A
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US
United States
Prior art keywords
contacts
plant
set forth
electrodes
controlled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00265638A
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English (en)
Inventor
E Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gebrueder Boehler and Co AG
Original Assignee
Gebrueder Boehler and Co AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gebrueder Boehler and Co AG filed Critical Gebrueder Boehler and Co AG
Application granted granted Critical
Publication of US3743749A publication Critical patent/US3743749A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
    • H05B7/148—Automatic control of power
    • H05B7/152—Automatic control of power by electromechanical means for positioning of electrodes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • ABSTRACT The plant comprises an ingot mold, a plurality of fusible electrodes and a plurality of electrical supply conductors connected to respective ones of said electrodes and incorporating each a contact ammeter having a contact, which is arranged to operate when the current in the associated conductor is below a predetermined minimum. Said contacts are connected in series. An electrode holder carries said fusible electrodes and is movable to feed said electrodes into said mold. Electrically operable feed drive means are connected in series with said contacts and arranged to move said electrode toward said mold when all said contacts are in an operating condition.
  • This invention relates to apparatus for controlling the feeding ofa plurality of fusible electrodes which are secured to the same holder and, if desired, the movement of a liftable ingot mold, in plants for the electric slag refining of metals, particularly steels.
  • a contact ammeter is provided in each of the electrical conductors connected to the fusible electrodes, and these ammeters have contacts which are connected in series and in response to a decrease in current to predetermined values, cause the means for feeding the electrode holder and, if desired, means for lifting the ingotmold to operate.
  • Three fusible electrodes are insulated from each other and secured to the same holder 1 1. Each of these electrodes is connected to one of the phase conductors R, S, T of a three-phase a.c. system. Each of these conductors R, S, T incorporates a contact ammeter 71.
  • the above-mentioned threephase a.c. system may be constituted, e.g., by the secondary windings of a threephase a.c. transformer.
  • the fusible electrodes 10 consist of steel and are preferably cylindrical and are immersed in a slag layer 60, which is provided in an ingot mold 20, which is, e.g., cylindrical. The electrodes are fused down under the action of the heat generated by the electric currents flowing through the electrodes.
  • the resulting molten steel 31 solidifies in the liquidcooled ingot mold 20 to form a solid ingot 30.
  • the neutral conductor N of the three-phase a.c. system is connected to the bottom plate 40, which consists preferably of copper and supports the ingot 30.
  • the electrode holder 11 and the ingot mold 20 are secured to respective lifting carriages 12 and 23 andtogether with the respective lifting carriages are vertically movable along a guide column 50 by means of respective rope drives.
  • Each rope drive comprises an electric gearmotor 13 or 24, a rope drum 14 or 25, which is secured to the stub shaft of the gearmotor, and a wire rope 15 or 26, which is secured at one endto the associated lifting carriage 12 or 23 and at the other end to the respective rope drum 14 or 25.
  • the two gearmotors 13 and 24 are provided with self-locking gears and mounted at the top end of the column 50.
  • An electric lead extends from the phase conductor R via the contacts 71' of the ammeters 71 to a point at which two leads 72 and are branched off.
  • the ammeter contacts 71 are thus connected in series.
  • Each of the leads 72 and 75 extends via the controlled contact 73" or 76" of a pulse-controlled relay 73 or 76 and the exciting winding 16 or 27' ofa three-phase a.c. contactor 16 or 27 to the neutral conductor M of the above-mentioned three-phase a.c. system.
  • Each of the contactors 16 and 27 controls the supply of current to one of the gearmotors l3 and 24 and for this purpose the normally open contact 16" or 27 of the contactor 16 or 27 is incorporated in the supply leads R1, S1, T1 or R2, S2, T2 of a three-phase a.c. system.
  • the exciting windings 73' and 76' of the pulse-controlled relays 73 and 76 are connected to a known pulse generator 78, which is mechanically or electronically adjustable and connected between the phase conductor R and the neutral conductor M. Whereas the pulses for the two relays 73 and 76 begin at the same time, they have different durations.
  • the durations of said pulses are selected relative to each other so that the position of the surface of the molten steel'31 relative to the ingot mold 20 remains substantially unchanged during the remelting operation after the system has been started up.
  • the above-described circuit causes the energization of the gearmotor 13 or 24 so that the electrode holder 11 and the fusible electrodes 10 are lowered by a predetermined distance and/or the ingot mold 20 is lifted by a predetermined distance.
  • the holder 11 and the fusible electrodes 10 secured thereto are lowered step by step during the remelting operation whereas the mold-lifting carriage 23 and the ingot mold 20 secured thereto is lifted step by step during the remelting operation.
  • each of the leads 72 and 75 includes a by-pass switch 74 or 77, which is connected in parallel to the pulse-controlled relay 73 or 76.
  • Two threepole change-over switches, not shown, are connected in the supply leads R1, S1, T1 and R2, S2, T2, respectively, and permit of reversing and terminating the energization of the gearmotors 13 and 24, respectively,
  • the underside of the ingot mold contacts the bottom plate 40 and the change-over switch incorporated in the supply leads R1, S1, T1 is in its deenergizing position. Because the fusible electrodes 10 have equal cross-sectional surfaces, the contacts 71 of the ammeters 71 are set to the same current values.
  • Electrode holders for use in accordance with the invention may have a plurality of arms which carry respective fusible electrodes and are secured to the same lifting carriage.
  • the plant according to the invention may be provided with a plurality of ingot mold tubes which are secured to the same holder and in which respective electrodes are fused down.
  • a plant for the electric slag refining of metals which comprises an ingot mold,
  • an electrode holder carrying said fusible electrodes and movable to feed said electrodes into said mold
  • electrically operable feed drive means connected in series with said contacts and arranged to move said electrode toward said mold when all said contacts are in an operated condition.
  • feed drive means comprise a drive motor and a contactor controlling the energization of said drive motor, said contactor-having an exciting winding
  • a pulse-controlled relay which comprises a controlled relay contact, and
  • said contacts of said ammeters are connected in series with said exciting winding and said controlled relay contact.
  • said feed drive means comprise a first drive motor and a first contactor controlling the energization of said first drive motor, said first contactor having a first exciting winding
  • said lifting drive means comprise a second drive motor and a second contactor controlling the energization of said second drive motor, said second contactor having a second exciting winding,
  • said second exciting winding and said second relay contacts being connected in parallel to said first exciting winding and said first relay contact, which precedes said first exciting winding, and
  • said contacts of said ammeters are connected in series with said first and second exciting windings and said first and second relay contacts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US00265638A 1971-09-17 1972-06-23 Electric slag refining plant Expired - Lifetime US3743749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2146551A DE2146551A1 (de) 1971-09-17 1971-09-17 Vorrichtung zur regelung des vorschubs von mehreren abschmelzelektroden

Publications (1)

Publication Number Publication Date
US3743749A true US3743749A (en) 1973-07-03

Family

ID=5819881

Family Applications (1)

Application Number Title Priority Date Filing Date
US00265638A Expired - Lifetime US3743749A (en) 1971-09-17 1972-06-23 Electric slag refining plant

Country Status (8)

Country Link
US (1) US3743749A (de)
JP (1) JPS5522184B2 (de)
AT (1) AT312833B (de)
DE (1) DE2146551A1 (de)
FR (1) FR2153953A5 (de)
GB (1) GB1400284A (de)
IT (1) IT965386B (de)
SE (1) SE372688B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104878214A (zh) * 2015-05-14 2015-09-02 浙江天马轴承有限公司 一种采用钢水分流及气体保护的电渣锭浇注装置
RU2645164C2 (ru) * 2015-03-10 2018-02-16 Игорь Михайлович Бершицкий Установка эшп

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS511478B2 (de) * 1972-12-01 1976-01-17
DE2732873A1 (de) * 1977-07-21 1979-02-15 Leybold Heraeus Gmbh & Co Kg Anordnung zur regelung der eintauchtiefe von abschmelzelektroden in elektroschlacke-umschmelzoefen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217205A (en) * 1962-06-07 1965-11-09 Pullman Inc Electric furnace electrode position control
US3300712A (en) * 1964-03-26 1967-01-24 Ajax Magnethermic Corp Control device for automatically adding and subtracting capacitors to maintain preselective power output
US3431344A (en) * 1965-11-15 1969-03-04 Westinghouse Electric Corp Control system providing supply circuit impedance balance control for electric arc furnaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217205A (en) * 1962-06-07 1965-11-09 Pullman Inc Electric furnace electrode position control
US3300712A (en) * 1964-03-26 1967-01-24 Ajax Magnethermic Corp Control device for automatically adding and subtracting capacitors to maintain preselective power output
US3431344A (en) * 1965-11-15 1969-03-04 Westinghouse Electric Corp Control system providing supply circuit impedance balance control for electric arc furnaces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2645164C2 (ru) * 2015-03-10 2018-02-16 Игорь Михайлович Бершицкий Установка эшп
CN104878214A (zh) * 2015-05-14 2015-09-02 浙江天马轴承有限公司 一种采用钢水分流及气体保护的电渣锭浇注装置

Also Published As

Publication number Publication date
JPS4838235A (de) 1973-06-05
AT312833B (de) 1974-01-25
IT965386B (it) 1974-01-31
DE2146551A1 (de) 1973-03-22
GB1400284A (en) 1975-07-16
FR2153953A5 (de) 1973-05-04
JPS5522184B2 (de) 1980-06-14
SE372688B (de) 1974-12-23

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