EP1825716B1 - Dispositif de sécurité servant à détecter des ruptures d'électrode - Google Patents

Dispositif de sécurité servant à détecter des ruptures d'électrode Download PDF

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Publication number
EP1825716B1
EP1825716B1 EP05850287A EP05850287A EP1825716B1 EP 1825716 B1 EP1825716 B1 EP 1825716B1 EP 05850287 A EP05850287 A EP 05850287A EP 05850287 A EP05850287 A EP 05850287A EP 1825716 B1 EP1825716 B1 EP 1825716B1
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EP
European Patent Office
Prior art keywords
electrode
safety device
protection plate
radiation protection
duct
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.)
Active
Application number
EP05850287A
Other languages
German (de)
English (en)
Other versions
EP1825716A1 (fr
Inventor
Manfred Schubert
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.)
SMS Siemag AG
Original Assignee
SMS Demag 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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1825716A1 publication Critical patent/EP1825716A1/fr
Application granted granted Critical
Publication of EP1825716B1 publication Critical patent/EP1825716B1/fr
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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
    • 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
    • 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
    • H05B7/12—Arrangements for cooling, sealing or protecting electrodes

Definitions

  • the invention relates to a safety device for detecting an electrode fracture in an electric arc furnace, wherein an electrode is attached to a Elektrodentragarm.
  • a warning signal for detecting the electrode breakage is generated by the fact that, in the case of a line which is filled with a medium which is subjected to a constant pressure, a pressure drop occurs in the event of an electrode break.
  • Electric arc furnaces are used as melter units for the production of steel in particular.
  • the electric arc furnace is filled from above with swung lid with scrap and other feedstocks and can melt the batch with the arc of the electrodes that protrude through the lid into the oven.
  • the electrodes are attached to Elektrodentragarmen and are adjusted according to the burn-up.
  • the electrode support arms as supports for the electrodes are usually current leaders and thus ensure the flow of current into the electrodes.
  • the DE 28 13 739 A1 For example, assume that a circuit monitors the current through the electrode and that a warning signal is generated indicating the electrode break when the interruption of current flow is exceeded for a predetermined period of time.
  • a water-cooled electrode known in which a pneumatic fracture safety is provided. Inert gas is brought to this connection surface via corresponding lines, which are arranged axially in the electrode inner body and which pass through a transition region in the front-side connecting surface between metal sleeve and wearing part. In this case, a constant pressure is applied, and a decrease in the pressure serves as a signal of the abort of the consumable part of the electrode.
  • This system has the disadvantage that no conventional electrodes can be used, but the electrode must be provided with lines running in its interior.
  • the object of the invention is to propose a safety device for detecting an electrode breakage, with which the disadvantages of the prior art are overcome.
  • an effective securing device is to be achieved, which can be used in conventional electrodes.
  • the core of the invention is that a line filled with a medium, which undergoes a pressure drop in the event of an electrode breakage, is not integrated in the electrode itself but is arranged below the electrode on the electrode support arm as a separate device in the sense of a separate protective component. This has the advantage that even existing facilities can be retrofitted with this system.
  • the electrode support arm preferably has a radiation protection plate, into which the pressurized line, which is closed at one end, is integrated.
  • This line is preferably pressurized with air.
  • a hole is burned in the radiation protection plate and thus in the pressurized line. The pressure collapses, providing a signal to shut down the melting energy.
  • the electrode is surrounded by a ring line, wherein the ring, which is not formed continuously, receives the pressurized medium and acts according to the radiation protection plate as a protective component. It is advisable to connect the ring to the radiation protection plate and in this way to guide the detection or conduction system close to the electrode body.
  • the radiation plate can be connected to the spray ring for cooling the electrode body.
  • the safety device By the safety device according to the invention greater damage to the electrode support arm can be reliably prevented and production interruptions are avoided.
  • the damaged radiation protection plate or damaged ring can be easily repaired or replaced at the next scheduled maintenance shift.
  • Fig. 1 shows a safety device 1 for detecting an electrode break, which is composed of a radiation protection plate 2 and a spray ring 14.
  • the radiation protection plate 2 is fastened to the electrode support arm 4, which has an electrode 6 (see FIG. Fig. 4 ).
  • the electrode 6 is locked via a correspondingly shaped contact shoe (not shown) and supplied with power.
  • the electrode support arm 4 protrudes beyond the electric arc furnace not shown here.
  • a line 7a of a first pattern is integrated in the radiation protection plate 2 or in the radiation protection plate. For this line 7a only one input 8 and no output is provided. About the entrance 8, the pipe 7a subjected to air and set a constant pressure. The pipe 7a itself runs along the edges 9 of the radiation protection plate 2, to then run into the center 10 of the plate 2 to end there.
  • a second line history pattern is in Fig. 2 shown.
  • the detection line 7b is integrated in the radiation protection plate 2 and is supplied via the feed line 11 shown here.
  • the line 7b continues in a spiral manner in the radiation protection plate 2. In this way, a high degree of overlap of the line 7b is achieved in relation to the plate surface, so that in case of failure, a line region is hit by the arc with high probability.
  • the line 7b itself ends again in the central region 10 of the radiation protection plate 2.
  • a spray ring 14 is arranged at the radiation protection plate 2.
  • Fig. 3 shows that the air-exposed pipe 7c of the radiation protection plate 2 extends into the pipe of a ring 3 arranged thereon.
  • the line runs meandering through the radiation protection plate 2 and ends in the two ring ends 12, 13, which are not connected to each other.
  • the line is under pressure.
  • Fig. 4 shows a line variant in which a radiation protection plate 2 is provided with a ring 3 and with a height offset arranged spray ring 14.
  • the ring 3 is arranged above the spray ring 14.
  • the operation of the safety device is as follows. If an electrode breaks, the arc occurs between the broken end of the electrode and the electrode support arm. The arc burns a hole in the line in the radiation protection plate and / or in the ring. The result is a pressure drop, which is detected as a signal for the accident, the melt stream can be switched off.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Claims (7)

  1. Dispositif de sécurité (1) pour la détection d'une rupture d'électrode dans un four à arc électrique, une électrode (6) étant fixée sur un bras porteur d'électrode (4), dans un conduit, qui est rempli d'un milieu soumis à une pression permanente, une chute de pression détectée comme étant un signal d'avertissement étant provoquée dans le cas d'une rupture d'électrode,
    caractérisé en ce que,
    le conduit (7a à d, 3) est intégré dans un élément protecteur, qui est fixé sur le bras porteur d'électrode (4), en dessous de celui ci, le conduit (7 a à d) étant détérioré par l'arc électrique qui se produit et la chute de pression se produisant dans le cas d'une rupture d'électrode.
  2. Dispositif de sécurité selon la revendication 1,
    caractérisé en ce que,
    l'élément de protection comprend une plaque de protection contre les rayonnements (2) qui est disposée en dessous d'un agencement de crampons (5) pour la fixation de l'électrode (6) sur le bras porteur d'électrode (4) à côté de l'électrode (6) et qui est intégré dans le conduit (7a à d).
  3. 1) Dispositif de sécurité selon la revendication 1 ou 2, caractérisé en ce que,
    le conduit (7c,7b) est intégré sous forme de méandre ou sous forme de spirale dans la plaque de protection contre les rayonnements (2).
  4. Dispositif de sécurité selon l'une quelconque des revendications 1 à 3, caractérisé en ce que,
    l'élément de protection comprend une bague (3) dans laquelle le conduit est intégré et qui entoure l'électrode (6) avec un écart.
  5. Dispositif de sécurité l'une quelconque des revendications 1 à 4, caractérisé en ce que,
    sur la plaque de protection contre les rayonnements (2) est disposée une bague de pulvérisation (14) pour refroidir l'électrode (6).
  6. Dispositif de sécurité selon la revendication 5,
    caractérisé en ce que,
    la bague de pulvérisation (14) est disposée avec un déport en hauteur par rapport à la bague élément de protection (3).
  7. Dispositif de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que, le milieu est de l'air.
EP05850287A 2004-12-17 2005-12-16 Dispositif de sécurité servant à détecter des ruptures d'électrode Active EP1825716B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004060826A DE102004060826A1 (de) 2004-12-17 2004-12-17 Sicherungseinrichtung zur Detektion von Elektrodenbrüchen
PCT/EP2005/013573 WO2006066817A1 (fr) 2004-12-17 2005-12-16 Dispositif de sécurité servant à détecter des ruptures d'électrode

Publications (2)

Publication Number Publication Date
EP1825716A1 EP1825716A1 (fr) 2007-08-29
EP1825716B1 true EP1825716B1 (fr) 2008-06-25

Family

ID=36051590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05850287A Active EP1825716B1 (fr) 2004-12-17 2005-12-16 Dispositif de sécurité servant à détecter des ruptures d'électrode

Country Status (10)

Country Link
US (1) US8654813B2 (fr)
EP (1) EP1825716B1 (fr)
JP (1) JP4897700B2 (fr)
KR (1) KR101204715B1 (fr)
CN (1) CN100525553C (fr)
AT (1) ATE399451T1 (fr)
CA (1) CA2590809C (fr)
DE (2) DE102004060826A1 (fr)
ES (1) ES2306286T3 (fr)
WO (1) WO2006066817A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011110522A1 (fr) 2010-03-10 2011-09-15 Sms Siemag Ag Système à bras support d'électrodes

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008006965A1 (de) * 2008-01-31 2009-08-06 Siemens Aktiengesellschaft Verfahren zur Ermittlung eines Strahlungsmaßes für eine thermische Strahlung, Lichtbogenofen, eine Signalverarbeitungseinrichtung sowie Programmcode und ein Speichermedium zur Durchführung des Verfahrens
DE102008006966A1 (de) * 2008-01-31 2009-08-06 Siemens Aktiengesellschaft Verfahren zur Ermittlung eines Stückigkeitsmaßes für Feststoff in einem Lichtbogenofen, einen Lichtbogenofen, eine Signalverarbeitungseinrichtung sowie Programmcode und ein Speichermedium
DE102008006958A1 (de) * 2008-01-31 2009-08-06 Siemens Aktiengesellschaft Verfahren zum Betreiben eines Lichtbogenofens mit wenigstens einer Elektrode, Regel- und/oder Steuerungseinrichtung, Maschinenlesbarer Programmcode, Datenträger und Lichtbogenofen zur Durchführung des Verfahrns
CN115595400B (zh) * 2022-10-22 2024-05-14 永兴县永和贵金属有限责任公司 一种三电极交直流电冶炼炉

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386260A (en) * 1943-09-16 1945-10-09 Payne William Harvey Mounting for electric arc furnace electrodes
JPS527046A (en) * 1975-07-07 1977-01-19 Ishikawajima Harima Heavy Ind Co Ltd Detector of consumption and breakage of electrode
US4287381A (en) * 1978-12-19 1981-09-01 British Steel Corporation Electric arc furnace electrodes
FR2458594A1 (fr) * 1979-06-06 1981-01-02 Heurtey Metallurgie Perfectionnements apportes aux installations de traitement d'acier en poches
NO802264L (no) * 1980-07-25 1982-01-26 Elkem Spigerverket As Holder for en elektrode i elektriske smelteovner.
JPH0227690A (ja) * 1988-07-15 1990-01-30 Showa Denko Kk 製鋼用アーク炉の電極冷却方法
US4852120A (en) * 1988-11-08 1989-07-25 Nikko Industry Co., Ltd. Cooling apparatus for electric arc furnace electrodes
AUPN595095A0 (en) * 1995-10-16 1995-11-09 Bhp Steel (Jla) Pty Limited Heating molten metal
US6214286B1 (en) * 1997-12-01 2001-04-10 Howmet Research Corporation Hybrid induction skull melting
WO2004028213A1 (fr) * 2002-09-20 2004-04-01 Pyromet Proprietary Products (Pty) Limited Determination de longueur d'electrode de four a arc
US20090050757A1 (en) 2007-08-20 2009-02-26 Oh Sung I Mount System Adapted to Rotate and Extend a Monitor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011110522A1 (fr) 2010-03-10 2011-09-15 Sms Siemag Ag Système à bras support d'électrodes
DE102010052086A1 (de) 2010-03-10 2011-09-15 Sms Siemag Ag Elektrodentragarmsystem

Also Published As

Publication number Publication date
US20080304538A1 (en) 2008-12-11
KR20070096780A (ko) 2007-10-02
DE102004060826A1 (de) 2006-06-29
KR101204715B1 (ko) 2012-11-26
CA2590809A1 (fr) 2006-06-29
ES2306286T3 (es) 2008-11-01
JP4897700B2 (ja) 2012-03-14
CA2590809C (fr) 2013-12-10
CN100525553C (zh) 2009-08-05
DE502005004544D1 (de) 2008-08-07
CN101080948A (zh) 2007-11-28
JP2008524784A (ja) 2008-07-10
WO2006066817A1 (fr) 2006-06-29
ATE399451T1 (de) 2008-07-15
US8654813B2 (en) 2014-02-18
EP1825716A1 (fr) 2007-08-29

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