EP0050682B1 - Elektrode für Lichtbogenöfen - Google Patents

Elektrode für Lichtbogenöfen Download PDF

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Publication number
EP0050682B1
EP0050682B1 EP80106581A EP80106581A EP0050682B1 EP 0050682 B1 EP0050682 B1 EP 0050682B1 EP 80106581 A EP80106581 A EP 80106581A EP 80106581 A EP80106581 A EP 80106581A EP 0050682 B1 EP0050682 B1 EP 0050682B1
Authority
EP
European Patent Office
Prior art keywords
electrode
molding
upper section
electrode according
screw nipple
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
Application number
EP80106581A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0050682A1 (de
Inventor
Hanns Georg Dr. Dipl.-Ing. Bauer
Dieter H. Dr. Dipl.-Chem. Zöllner
Josef Dr. Dipl.-Ing. Otto
Josef Mühlenbeck
Friedrich Rittmann
Claudio Dipl.-Ing. Conradty
Inge Dr. Dipl.-Chem. Lauterbach-Dammler
Horst Ing. Grad Sonke
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.)
Arc Technologies Systems Ltd
Original Assignee
Arc Technologies Systems Ltd
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 Arc Technologies Systems Ltd filed Critical Arc Technologies Systems Ltd
Priority to AT80106581T priority Critical patent/ATE21606T1/de
Priority to DE8080106581T priority patent/DE3071711D1/de
Priority to EP80106581A priority patent/EP0050682B1/de
Priority to US06/285,514 priority patent/US4468783A/en
Priority to CA000383581A priority patent/CA1170697A/en
Priority to PL1981232707A priority patent/PL134641B1/pl
Priority to JP56132021A priority patent/JPS5776786A/ja
Priority to IN1166/CAL/81A priority patent/IN156502B/en
Priority to DD81234361A priority patent/DD201836A5/de
Priority to FI813339A priority patent/FI813339L/fi
Priority to GB8132212A priority patent/GB2089628A/en
Priority to HU813134A priority patent/HU183641B/hu
Priority to SU813345827A priority patent/SU1152535A3/ru
Priority to BR8106904A priority patent/BR8106904A/pt
Priority to YU02555/81A priority patent/YU255581A/xx
Priority to ES507050A priority patent/ES507050A0/es
Priority to TR21841A priority patent/TR21841A/xx
Priority to ZA817411A priority patent/ZA817411B/xx
Priority to AU76815/81A priority patent/AU546161B2/en
Priority to NO813603A priority patent/NO813603L/no
Priority to GR66353A priority patent/GR82294B/el
Priority to DE19813142413 priority patent/DE3142413A1/de
Priority to PT73881A priority patent/PT73881B/pt
Priority to DK471581A priority patent/DK471581A/da
Publication of EP0050682A1 publication Critical patent/EP0050682A1/de
Application granted granted Critical
Publication of EP0050682B1 publication Critical patent/EP0050682B1/de
Expired 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
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc

Definitions

  • the invention relates to an electrode for arc furnaces made of an upper section made of metal and a replaceable lower section made of consumable or slow-consumable material, which have a substantially cylindrical shape and are connected to one another by a screw nipple or the like, the upper section being a Has liquid cooling device with a flow channel and a return channel and the upper section is at least in its lower area surrounded by a high-temperature resistant, protective coating.
  • Such electrodes are already known from DE-A-27 25 537.
  • the metal shaft which contains the cooling system, is covered by an external, high-temperature-resistant mass. This is obviously a continuous coating, to improve the adhesion hooks are drawn into the metal shaft.
  • Similar electrodes are also known from GB-B-1 223 162, in which a protective ceramic coating is applied to the entire metal shaft. According to this solution, care is taken to ensure that the ceramic coating is as thin as possible and also penetrates to a considerable extent into the metal shaft itself to insulate the pipes running there. These tubes represent both the cooling water supply and the electrical connection to the graphite consumable part.
  • an electrode which has an upper shaft which consists of a copper tube which is surrounded by refractory rings. Between these refractory rings copper disks are arranged, which are connected to the copper pipe, whereby they hold the refractory rings in position. The copper disks also have the task of leading the electrode potential to the outer surface of the upper shaft. If one of these fire rings is broken, the entire upper shaft must be repaired.
  • EP-A-12573 describes an electrode in which the laterally external metallic contact of the metal shaft is mounted in an insulating manner with respect to the internal metallic cooling system.
  • a ceramic coating secured with hooks, which extends to approximately the height of the screw nipple connection.
  • Electrodes for arc furnaces are exposed to heavy loads. This is explained by the high working temperatures, e.g. B. in electrical steel production, in which such electrodes are used most often.
  • the arc which ideally leads into the melt at the lower electrode tip, also results in losses due to side oxidation. Finally, there is a risk of migration or the lateral setting of the arc, which can also occur above the consumable in the event of a fault and lead to short circuits.
  • the electrodes have different temperatures in the flow and return of the. Coolant and in the area of the consumable to the power supply and cooling unit.
  • the area of the screw nipple represents a particularly endangered area.
  • the invention has for its object to provide electrodes of high occupational safety with low current and voltage drop in the feed, which are as little prone to failure as possible, but are also easy to manufacture and repair.
  • the electrodes should allow the electrode process to be continued in an improved manner compared to conventional electrodes, in particular in the event of undesired displacement of the arc, even in the event of partial damage.
  • an electrode of the type mentioned at the outset which is characterized in that the protective coating is formed from a molded part which loosely surrounds the upper section and is arranged to be axially slidable along this upper section.
  • the high-temperature-resistant, insulating molded part can be a single pipe. However, it can also advantageously comprise a series of tube sections, segments, half-shells or the like, which surround the lower area of the upper section of the electrode up to the area of the screw nipple, possibly beyond.
  • the material of the insulating molding can, for. B. consist of high temperature resistant ceramic, but also z. B. represent graphite, which is coated with a coating. Such insulating, high-temperature resistant ceramic or other materials are known.
  • the insulating molded part is arranged between a lower partial area of the upper section made of metal and the lower, consuming section such that the outer edges of the molded part running in the direction of the electrode axis and those of the outer area of the upper section Metal are essentially flush with each other.
  • the electrode according to the invention hen no restrictions with regard to the counter bearing on which the molded part is carried.
  • This can be a counterpart, also made of insulating material that can be subjected to high temperatures, the screw nipple itself, possibly even a part of the consumable itself, or a combination thereof.
  • the insulating molded part will not sit on the consumable alone, but will be at least partially supported by a non-"consumable", heat-resistant, insulating material.
  • the position of the molded part can of course be controlled in a suitable form during the manufacture of the electrode.
  • the insulating molded part can also during operation of the electrode, without the electrode having to be led out of the oven, through bores provided in the upper section by means of pins, threaded screws etc., on the counter bearing, e.g. B. by the additional provision of springs. Irrespective of the provision of bores, threaded screws or the like, it can also be advantageous to place the insulating molded part in such a way that it slides or loosely with respect to the metal shaft so that in the event of failure of a partial segment or the individual tube breaking off, eg. B. by mechanical damage, the remaining intact sub-segments or the individual tube itself can slip, or are movable in the direction of the electrode longitudinal axis.
  • a preferred embodiment of the electrode according to the invention is directed to the fact that an electrically conductive, high-temperature-resistant intermediate layer is introduced between the insulating, high-temperature-resistant molded part and the inner part of the metal shaft.
  • the electrically conductive intermediate layer can also represent a single tube, but also a series of tube sections, segments, half-shells or the like. Instead of preformed molded parts, however, electrically conductive, high-temperature resistant felt or fabric can also be used as such an intermediate layer.
  • the electrically conductive intermediate layer can also consist of a combination of a series of e.g. B. exist pipe sections with high temperature resistant felt or fabric.
  • a heavy-duty, conductive thin coating to the inner metal shaft, which is protected by the electrically insulating and the electrically conductive coating.
  • This can be a ceramic coating, for example.
  • the electrically conductive intermediate layer can consist, for example, of conductive ceramic, graphite, ceramic, mineral or carbon fibers, fabrics or felts or a combination thereof.
  • both the insulating molded part and the conductive intermediate layer on holders, which can preferably be attached to the metal of the inner cooling unit.
  • this is primarily taken into account in such applications of the electrodes, where the free mobility or the moving up of intact (insulating or electrically conductive) individual segments is not important in the event of damage to an underlying segment.
  • the insulating molded part does not encompass the entire area of the metal shaft to be protected, with an insulating, highly fireproof injection molding compound which is anchored with holding pieces in place of the continued molded part in a zone where less stress can be expected is used.
  • Such insulating molding compounds are known per se, which with holding pieces, the z. B. soldered, can be attached.
  • the insulating molded part and the electrically conductive coating can easily be introduced in a targeted position during manufacture.
  • the mechanical strength can be improved by using an insulating, external solid part. This is particularly important for electrodes that are used to manufacture electrical steel.
  • the immersion of scrap parts in the melt can lead to considerable movements of the melt with a corresponding mechanical load.
  • the electrode Due to the loose placement of the insulating molded part, but also the conductive coating, insofar as it is formed from molded parts, in the event of mechanical or other destruction of the underlying protective segments, there is an “automatic” sliding of the upper segments, which may be caused by springs is additionally secured. Therefore, the electrode is also in case of damage continues to work, since the most vulnerable lower electrode area, which is closest to the working zone of the electrode, is automatically protected by the sliding of intact elements. Mechanical vibrations caused by scrap parts slipping in, boiling delays etc. are absorbed in a particularly favorable manner by the resilient mounting of the insulating layer in the axial part of the electrode as well as the internal padding of the electrically conductive coating made of fibers, carbon felts and fabrics etc.
  • the insulating molded part or the insulating coating if it consists of a series of individual segments, half-shells or the like, can have a certain amount of play due to the type of axial as well as the internal support, the tongue and groove system results, for example, in Segments a complete and comprehensive protection of the sensitive metal area of the electrode. If the “protective shield” of the electrode is nevertheless damaged, it can usually continue to work until the consumable part is used anyway. When the electrode is removed, the corresponding replacement of the damaged individual segment etc. can then easily be carried out without further effort.
  • the internal electrically conductive coating made of high-temperature resistant material, such as conductive ceramic or graphite or the carbon felts etc., can ultimately give the electrode emergency running properties. If the outer ring breaks, the internal, electrically conductive coating is able to withstand the temperatures of an arc that may form. This protects the relatively sensitive, internal metal shaft from the heat of the arc, which may be positioned laterally, so that there is no immediate failure of the electrode. In the case of conventional electrodes, the latter is to be feared if the outer, insulating coating has been destroyed mechanically or in some other way and the arc attaches directly to the metal shaft, which then cannot withstand the extreme temperatures of the arc that occur.
  • the cooling medium usually water
  • the cooling medium also enters a chamber within the screw nipple 1, the z. B. is made of cast iron.
  • the upper section 5 made of metal consists of an upper area of larger diameter and a lower-lying area of smaller diameter, which is drawn into the screw nipple 1, which connects to the lower section 6 of consumable material, for. B. graphite forms.
  • the insulating molding 4 is by a counter bearing 7, for. B. made of high temperature resistant, insulating ceramic. In the upper region, the insulating molded part 4 is delimited by the upper edge of the region of larger diameter of the metal shaft.
  • the insulating molded part 4 is adjoined by the electrically conductive intermediate layer 11, which is delimited on the inside by the drawn-in, inner metal shaft or its section of smaller diameter 12.
  • both the insulating molded part 4 and the electrically conductive intermediate layer 11 are divided into segments which are slidable in the direction of the electrode axis when a (lower) segment breaks out.
  • additional bores 8 can be provided, through which inserted pins 9 via the spring 10 ensure a good fit of the insulating molded part.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
EP80106581A 1980-10-27 1980-10-27 Elektrode für Lichtbogenöfen Expired EP0050682B1 (de)

Priority Applications (24)

Application Number Priority Date Filing Date Title
AT80106581T ATE21606T1 (de) 1980-10-27 1980-10-27 Elektrode fuer lichtbogenoefen.
DE8080106581T DE3071711D1 (en) 1980-10-27 1980-10-27 Electrode for arc furnaces
EP80106581A EP0050682B1 (de) 1980-10-27 1980-10-27 Elektrode für Lichtbogenöfen
US06/285,514 US4468783A (en) 1980-10-27 1981-07-21 Electrode for arc furnaces
CA000383581A CA1170697A (en) 1980-10-27 1981-08-11 Electrode for arc furnaces
PL1981232707A PL134641B1 (en) 1980-10-27 1981-08-19 Arc furnace electrode
JP56132021A JPS5776786A (en) 1980-10-27 1981-08-21 Electrode for arc furnace
IN1166/CAL/81A IN156502B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1980-10-27 1981-10-21
DE19813142413 DE3142413A1 (de) 1980-10-27 1981-10-26 Elektrode fuer lichtbogenoefen
GB8132212A GB2089628A (en) 1980-10-27 1981-10-26 Electrode for arc furnaces
HU813134A HU183641B (en) 1980-10-27 1981-10-26 Electrode for arc furnaces
SU813345827A SU1152535A3 (ru) 1980-10-27 1981-10-26 Электрод дл дуговой электропечи
DD81234361A DD201836A5 (de) 1980-10-27 1981-10-26 Elektrode fuer lichtbogenoefen
YU02555/81A YU255581A (en) 1980-10-27 1981-10-26 Electrode for electric arc furnaces
ES507050A ES507050A0 (es) 1980-10-27 1981-10-26 Perfeccionamientos en los electrodos para hornos de arco.
TR21841A TR21841A (tr) 1980-10-27 1981-10-26 Arkli firinlar icin elektrod
ZA817411A ZA817411B (en) 1980-10-27 1981-10-26 Electrode for arc furnaces
AU76815/81A AU546161B2 (en) 1980-10-27 1981-10-26 Arc furnace electrode
NO813603A NO813603L (no) 1980-10-27 1981-10-26 Elektrode for lysbueovner.
GR66353A GR82294B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1980-10-27 1981-10-26
FI813339A FI813339L (fi) 1980-10-27 1981-10-26 Elektrod foer ljusbaogeugnar
PT73881A PT73881B (en) 1980-10-27 1981-10-26 Electrode for arc furnace
DK471581A DK471581A (da) 1980-10-27 1981-10-26 Elektrode til lysbueovne
BR8106904A BR8106904A (pt) 1980-10-27 1981-10-26 Eletrodo para fornos de arcos voltaicos

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80106581A EP0050682B1 (de) 1980-10-27 1980-10-27 Elektrode für Lichtbogenöfen

Publications (2)

Publication Number Publication Date
EP0050682A1 EP0050682A1 (de) 1982-05-05
EP0050682B1 true EP0050682B1 (de) 1986-08-20

Family

ID=8186860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106581A Expired EP0050682B1 (de) 1980-10-27 1980-10-27 Elektrode für Lichtbogenöfen

Country Status (22)

Country Link
US (1) US4468783A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0050682B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5776786A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATE21606T1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU546161B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BR (1) BR8106904A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1170697A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DD (1) DD201836A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3071711D1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DK (1) DK471581A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES507050A0 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FI (1) FI813339L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB2089628A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GR (1) GR82294B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
HU (1) HU183641B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IN (1) IN156502B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NO (1) NO813603L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
PL (1) PL134641B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
PT (1) PT73881B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
TR (1) TR21841A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
YU (1) YU255581A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ZA (1) ZA817411B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3102776A1 (de) * 1981-01-28 1982-08-26 C. Conradty Nürnberg GmbH & Co KG, 8505 Röthenbach Elektrode fuer lichtbogenoefen
ZA832152B (en) * 1982-04-23 1983-12-28 Arc Tech Syst Ltd Arrangement of an electrode for arc furnaces
ZA832153B (en) * 1982-04-26 1983-12-28 Arc Tech Syst Ltd Protective coating of temperature resistant materials for the metal shaft of combination electrodes for the electric steel production
ZA84806B (en) * 1983-03-22 1984-09-26 Arc Tech Syst Ltd Electrode for electric arc furnaces
JPS59198698A (ja) * 1983-04-27 1984-11-10 共英製鋼株式会社 電気炉用冷却電極
EP0167485A1 (en) * 1984-06-25 1986-01-08 Arc Technologies Systems, Ltd. Assembly for the automatic cooling water connection to water cooled combination electrodes for electric arc furnaces
US5125002A (en) * 1991-01-07 1992-06-23 Toledo Engineering Co., Inc. Furnace electrode protector
JPH0521941U (ja) * 1991-09-05 1993-03-23 忠 竹原 浴場用健康増進具
US5912916A (en) * 1995-05-01 1999-06-15 Alabama Power Company Electric furnace with insulated electrodes and process for producing molten metals
IT1288858B1 (it) * 1996-02-29 1998-09-25 Danieli Off Mecc Dispositivo adattatore per elettrodi, con funzione di reattanza ausiliaria, in un forno elettrico ad arco.
CN104219811B (zh) * 2013-06-05 2016-03-02 株洲火炬工业炉有限责任公司 一种复合石墨电极及其制作方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368019A (en) * 1965-05-24 1968-02-06 Westinghouse Electric Corp Non-consumable electrode
FR2176546A1 (en) * 1972-03-23 1973-11-02 Siderurgie Fse Inst Rech Composite furnace electrode - esp for steel prodn
DE2725537A1 (de) * 1977-06-06 1978-12-14 Korf Stahl Elektrode fuer lichtbogenoefen
US4145564A (en) * 1978-01-30 1979-03-20 Andrew Dennie J Non-consumable electrode with replaceable graphite tip
DE2845367C2 (de) * 1978-10-18 1981-01-22 Korf & Fuchs Syst Tech FlUssigkeitsgekühlte Halterung für die Spitze einer Elektrode eines Lichtbogenschmelzofens
GB2037549B (en) * 1978-12-19 1983-03-23 British Steel Corp Arc furnace electrode
SE431443B (sv) * 1979-03-23 1984-02-06 Bulten Kanthal Ab Elektrod for uppvermning av glasmassa

Also Published As

Publication number Publication date
FI813339A7 (fi) 1982-04-28
US4468783A (en) 1984-08-28
DE3071711D1 (en) 1986-09-25
BR8106904A (pt) 1982-07-13
IN156502B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1985-08-17
EP0050682A1 (de) 1982-05-05
PT73881B (en) 1983-01-25
TR21841A (tr) 1985-09-06
ES8302994A1 (es) 1982-12-01
JPS6134240B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1986-08-06
DE3142413A1 (de) 1982-07-08
FI813339L (fi) 1982-04-28
PT73881A (en) 1981-11-01
ES507050A0 (es) 1982-12-01
GR82294B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1984-12-13
ATE21606T1 (de) 1986-09-15
AU7681581A (en) 1982-05-06
DK471581A (da) 1982-04-28
PL232707A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1982-07-19
GB2089628A (en) 1982-06-23
NO813603L (no) 1982-04-28
AU546161B2 (en) 1985-08-15
DD201836A5 (de) 1983-08-10
PL134641B1 (en) 1985-08-31
JPS5776786A (en) 1982-05-13
HU183641B (en) 1984-05-28
YU255581A (en) 1983-12-31
CA1170697A (en) 1984-07-10
ZA817411B (en) 1982-10-27

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