EP0219650B1 - Kontaktelektroden-Anordnung für Gleichstrom-Lichtbogen oder Widerstands-Schmelzöfen - Google Patents

Kontaktelektroden-Anordnung für Gleichstrom-Lichtbogen oder Widerstands-Schmelzöfen Download PDF

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Publication number
EP0219650B1
EP0219650B1 EP86111685A EP86111685A EP0219650B1 EP 0219650 B1 EP0219650 B1 EP 0219650B1 EP 86111685 A EP86111685 A EP 86111685A EP 86111685 A EP86111685 A EP 86111685A EP 0219650 B1 EP0219650 B1 EP 0219650B1
Authority
EP
European Patent Office
Prior art keywords
contact electrode
furnace
direct
current arc
modular unit
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
EP86111685A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0219650A1 (de
Inventor
Heinz Guido
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.)
MAN Gutehoffnungshutte GmbH
Original Assignee
MAN Gutehoffnungshutte GmbH
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 MAN Gutehoffnungshutte GmbH filed Critical MAN Gutehoffnungshutte GmbH
Priority to AT86111685T priority Critical patent/ATE62577T1/de
Publication of EP0219650A1 publication Critical patent/EP0219650A1/de
Application granted granted Critical
Publication of EP0219650B1 publication Critical patent/EP0219650B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/03—Electrodes
    • 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
    • H05B7/06—Electrodes

Definitions

  • the invention relates to a direct current arc or resistance melting furnace, in particular an exchangeable contact electrode arrangement, the contact electrode consisting of a metallic support plate, furthermore a metal base plate arranged at a distance therefrom and connected to the support plate by means of bolts, one or more metallic contact rods, which are attached with their necks to the base plate, a refractory stamping out between the upper edge of the contact rods and the support plate and power and coolant lines arranged below the base plate.
  • an arc furnace as a direct current furnace with a cathodically polarized graphite electrode and an anodically polarized contact electrode in the furnace bottom also has the advantage of significantly reduced graphite electrode consumption. Another advantage is the significantly lower noise level.
  • the structure and mode of operation of direct current arc furnaces are known from numerous publications.
  • the component that is essential for practical furnace operation is the contact electrode in the furnace vessel, which on the one hand must ensure good electrical contact with the scrap used or in the later course of the melting process with the liquid metal, but on the other hand is exposed to high thermal loads.
  • Such a contact electrode is known from DE-PS 3l O6 74l.
  • the contact electrodes in the DC arc furnace are subject to premature wear in relation to the furnace hearth lining. Since the replacement of individual contact rods means a relatively large amount of work, in practice it has been decided to replace all the contact rods together at appropriate intervals.
  • This mode of operation has the defect that the insertion of the contact rods, the tamping of the center of the furnace floor and the subsequent drying process of the ramming mass delay the restart of the furnace. Furthermore, tamping the center of the furnace floor inside the hot furnace is difficult for the personnel.
  • the object of the invention is to improve the contact electrode arrangement, as proposed according to DE-PS 3l O6 74l, in the direction of simpler and faster production, assembly and disassembly.
  • the contact electrode arrangement is therefore designed and manufactured as a complete component of the melting furnace.
  • This component is inserted into the furnace vessel with a circular opening on the bottom by means of a crane.
  • suspension elements eyelets
  • the assembly is lowered into the furnace vessel and sits on the ring-shaped stiffening in the furnace vessel with its support plate.
  • the base plate to which the power and coolant lines are connected hangs down through the furnace opening.
  • the suspension means mentioned on the top of the contact electrode assembly have fulfilled their task after the assembly has been lowered and placed on the bottom of the furnace vessel and melt during operation of the furnace.
  • the pressure elements telescopic cylinder
  • the contact electrode is first broken out of the pounding compound with a large compressive force and then pushed upwards so far that the gripper of a traction means located above the open furnace vessel can grip around the contact electrode and pull it up out of the furnace.
  • the replacement of the contact electrode assembly can also be carried out in such a way that, after the last batch, a residual melt is left on the hearth of the furnace and suitable eyelets are inserted into this melt puts. These eyelets get their hold after the melt has cooled. Now that the contact electrode has only been broken out of the composite in the furnace vessel with the help of the pressure elements (telescopic cylinder), the support eyelets have sufficient hold in the residual melt located above the contact electrode, so that the contact electrode, which has already been released from the furnace vessel, can be lifted up without difficulty by a traction device can be pulled out. Subsequently, the insertion of a new contact electrode assembly can take place in the manner already described.
  • the furnace vessel of a direct current arc furnace shown in the figures has a steel jacket 1 and a steel vessel bottom 7.
  • the furnace vessel is provided with a refractory lining 2.
  • the contact electrode is inserted as a compact structural unit in the annular bottom recess of the furnace vessel.
  • the contact electrode assembly is completely created outside the furnace.
  • the structural unit consists of a support plate 3, a base plate 4 arranged at a distance below it and connected to the support plate 3 by means of bolts 5.
  • Metallic contact bars 6 are attached to the base plate 4 with their necks standing vertically.
  • the space l3 of the contact electrode from the upper edge of the contact rods 6 to the support plate 3 is stamped out in such a way that a template is arranged around the contact electrode, which is removed again after the stamping out has solidified.
  • the upper side of the contact electrode assembly has at least one suspension element (lifting eye), on which the hook of the traction mechanism is attached, with which the entire contact electrode assembly is lowered into the furnace vessel from above.
  • the contact electrode is placed with its support plate 3 on the edge of the annular bottom recess and connected to the furnace vessel by suitable means.
  • the annular gap 11 between the construction used and the refractory lining 2 of the furnace vessel 1 is stamped out with refractory material.
  • the suspension means (lifting eyes), not shown, melt during the first furnace operation.
  • the exchange of the used contact electrode takes place in such a way that after the furnace has been emptied, the pressure elements (telescopic cylinder 10) located on the cantilever claws 9 of the annular stiffening 8 extending below the furnace vessel are extended and the complete contact electrode assembly is removed from the stamping compound is broken out with the furnace vessel. As soon as the break-out has taken place, the telescopic cylinders 10 can be extended further so that the contact electrode emerges from the hearth of the furnace vessel to such an extent that it can be gripped and pulled out by the gripper of a crane (not shown) located above the open furnace.
  • An alternative of replacing the contact electrode assembly provides that a residual melt 17 is left in the hearth floor after the last batch of the furnace. At least one support eyelet l4 is let into this residual melt l7, to which, after the residual melt l7 has cooled, a traction means is struck, which pulls the contact electrode assembly upward out of the furnace vessel after the contact electrode has previously been arranged with the aid of the pressure elements 10 (below the furnace vessel). Telescopic cylinder) has been broken out of the association with the furnace vessel by raising the telescopic cylinder.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
EP86111685A 1985-10-05 1986-08-22 Kontaktelektroden-Anordnung für Gleichstrom-Lichtbogen oder Widerstands-Schmelzöfen Expired - Lifetime EP0219650B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111685T ATE62577T1 (de) 1985-10-05 1986-08-22 Kontaktelektroden-anordnung fuer gleichstromlichtbogen oder widerstands-schmelzoefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3535692 1985-10-05
DE19853535692 DE3535692A1 (de) 1985-10-05 1985-10-05 Kontaktelektroden-anordnung fuer gleichstrom-lichtbogen- oder widerstands-schmelzoefen

Publications (2)

Publication Number Publication Date
EP0219650A1 EP0219650A1 (de) 1987-04-29
EP0219650B1 true EP0219650B1 (de) 1991-04-10

Family

ID=6282922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111685A Expired - Lifetime EP0219650B1 (de) 1985-10-05 1986-08-22 Kontaktelektroden-Anordnung für Gleichstrom-Lichtbogen oder Widerstands-Schmelzöfen

Country Status (5)

Country Link
US (1) US4700355A (enrdf_load_stackoverflow)
EP (1) EP0219650B1 (enrdf_load_stackoverflow)
JP (1) JPS6282694A (enrdf_load_stackoverflow)
AT (1) ATE62577T1 (enrdf_load_stackoverflow)
DE (2) DE3535692A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19921287A1 (de) * 1999-05-07 2000-11-16 Sms Demag Ag Gleichstromofen

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01128392A (ja) * 1987-11-12 1989-05-22 Nkk Corp 直流式電気炉の電極ブロック
JPH0624157Y2 (ja) * 1988-07-01 1994-06-22 日本鋼管株式会社 直流電気炉の炉底電極
DE4022720A1 (de) * 1990-07-17 1992-01-23 Flohe Gmbh & Co Untergefaess eines gleichstromlichtbogenofens
DE4130397A1 (de) * 1991-09-12 1993-03-18 Kortec Ag Gleichstromofen mit einer herdelektrode, herdelektrode und elektrodenblock sowie betriebsverfahren fuer diesen ofen
US5280495A (en) * 1992-02-14 1994-01-18 Ajax Magnethermic Corporation Furnace refractory extraction system and method
DE4222854C2 (de) * 1992-07-11 1995-08-31 Gutehoffnungshuette Man Bodenelektrode für Gleichstrom-Lichtbogenöfen

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR393740A (fr) * 1907-11-04 1908-12-31 Charles Albert Keller Système de sole conductrice pour tours électriques
DE1583247B1 (de) * 1967-01-02 1970-08-06 Dolomite Franchi S P A Feuerfeste Auskleidung fuer elektrische Lichtbogenoefen
US3717713A (en) * 1971-02-18 1973-02-20 M Schlienger Arc furnace crucible
SU617481A1 (ru) * 1975-09-08 1978-07-30 Предприятие П/Я Г-4361 Тигель дл гарниссажной печи
SE415394B (sv) * 1978-12-29 1980-09-29 Asea Ab Bottenkontakt vid likstromsljusbagsugn
SE423275B (sv) * 1979-06-26 1982-04-26 Asea Ab Bottenkontakt vid likstromsljusbagsugn
DE3106741C2 (de) * 1981-02-24 1983-06-16 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 4200 Oberhausen Kontaktelektroden-Anordnung für Lichtbogen- oder Widerstandsschmelzofen
JPS5927078A (ja) * 1982-08-07 1984-02-13 海野　延夫 戸当り
DE3466919D1 (en) * 1983-03-31 1987-11-26 Italimpianti Improved conductive bottom for direct current electric arc furnaces
ATE24815T1 (de) * 1983-07-28 1987-01-15 Bbc Brown Boveri & Cie Kuehlanordnung einer bodenelektrode fuer einen gleichstromlichtbogenofen.
CH664059A5 (de) * 1983-07-28 1988-01-29 Bbc Brown Boveri & Cie Elektrischer ofen, insbesondere gleichstromlichtbogenofen.
ATE27059T1 (de) * 1983-07-28 1987-05-15 Bbc Brown Boveri & Cie Bodenelektrode fuer einen gleichstromlichtbogenofen.
DE3409255A1 (de) * 1984-03-14 1985-12-12 Didier-Werke Ag, 6200 Wiesbaden Herdboden, besonders fuer gleichstrom-lichtbogenoefen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19921287A1 (de) * 1999-05-07 2000-11-16 Sms Demag Ag Gleichstromofen

Also Published As

Publication number Publication date
JPS6282694A (ja) 1987-04-16
ATE62577T1 (de) 1991-04-15
DE3678666D1 (de) 1991-05-16
JPH0464155B2 (enrdf_load_stackoverflow) 1992-10-14
DE3535692A1 (de) 1987-04-09
EP0219650A1 (de) 1987-04-29
US4700355A (en) 1987-10-13

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