EP0275384B1 - Metallurgic vessel, particularly an electric furnace with one or more bottom electrodes - Google Patents

Metallurgic vessel, particularly an electric furnace with one or more bottom electrodes Download PDF

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Publication number
EP0275384B1
EP0275384B1 EP87116369A EP87116369A EP0275384B1 EP 0275384 B1 EP0275384 B1 EP 0275384B1 EP 87116369 A EP87116369 A EP 87116369A EP 87116369 A EP87116369 A EP 87116369A EP 0275384 B1 EP0275384 B1 EP 0275384B1
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EP
European Patent Office
Prior art keywords
contact
side bars
vessel
bottom electrode
metallurgic
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
EP87116369A
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German (de)
French (fr)
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EP0275384A1 (en
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 AT87116369T priority Critical patent/ATE64513T1/en
Publication of EP0275384A1 publication Critical patent/EP0275384A1/en
Application granted granted Critical
Publication of EP0275384B1 publication Critical patent/EP0275384B1/en
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
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes

Definitions

  • Electric furnaces in particular direct current arc furnaces, have a contact device in their base, which makes the necessary electrical contact with the scrap or the melt during the melting process.
  • Such a contact device is e.g. described in EP-B1 0 058 817.
  • This replacement is preferably done by removing the bottom electrode in one piece from the furnace vessel and replacing it with a new one.
  • the power cables remain suspended from the bottom of the furnace.
  • a base electrode arrangement for a direct current arc furnace which describes a single base electrode in several embodiments, preferably round or also polygonal, the cross section of which tapers towards the interior of the furnace, expands or remains cylindrical around it to be able to expand from the outside towards the inside of the furnace.
  • the connecting piece is designed as a contact sleeve, preferably made of copper.
  • the bottom electrode is supported on the side surfaces of the contact sleeve and the connector is provided with cooling channels which are closed towards the electrode.
  • the contact tabs on the connector of the bottom electrode are connected to the electrical power supply cables by means of screw connections. In contrast to the invention, these tabs are to be loosened or fastened by a screw connection.
  • the object of the invention is to provide a suspension for the power cable on the mating contact of the bottom electrode, which at the same time in a simple manner produces the reliable attachment to the bottom electrode required for the power line and which adapts without constraint and alignment inaccuracies.
  • the configuration of the suspension device according to the invention is also characterized in that the contact devices can be reused even after the bottom electrode has been changed several times.
  • Fig. 1 shows the furnace vessel (1) with the refractory lining (2) located inside.
  • the bottom electrode consisting of a support plate (3), base plate (4), contact rods (5), counter contact (14) and refractory stamping (6) can be seen.
  • the power cables (7) are attached to the tabs (8).
  • the straps are suspended in a clamping frame (10) by means of supporting bolts (9).
  • the tenter frame (10) is fastened to two supports (11), which are in turn anchored to the furnace vessel.
  • Fig. 2 shows the details of the arrangement described.
  • the connection between the support bolts (9) and the bracket (8) is angularly movable, for example, a spherical bearing. Due to the angular mobility, the tab is able to contact the counter contact (14) of the base electrode exactly without squeezing.
  • a spring (13) which is installed in the clamping frame (10), presses the tab (8) against the mating contact (14) by means of displaceable support bolts (9) and articulated bearings (12).
  • the opening of the contact device necessary for replacing the base electrode takes place in such a way that the supporting bolts (9) are withdrawn from outside the clamping frame. This also pulls the tabs (8) back and opens the contact.
  • FIG. 3 shows the device in a sectional view rotated by 90 °. It can be seen that the clamping frame (10) is fastened to the insulators (16) by means of a sliding connection (15). By means of this sliding connection, the clamping frame (10) can automatically align itself with the mating contact (14) when the tabs (8) are pressed on. This freedom from torsion of the tabs (8) achieved by the sliding connection and the angular mobility of the spherical bearings ensure that the tabs (8) are correctly seated against the counter contact (14) and that the pressure is distributed evenly over the entire contact surface.
  • the insulators (16) are attached to the carriers (11).
  • the carriers (11) are attached to the furnace vessel (1). This arrangement has the effect that the current flows exclusively into the melt via the tabs and the bottom electrode.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

An electrical metallurgical furnace including a vessel and a bottom electrode positioned in the bottom of the vessel. At least one counter contact is provided connected to the bottom electrode. A support is anchored to the vessel connected to the insulation mounting unit. A tension frame is held by the insulation mounting unit. At least one current cable is provided for engagement with a side of the counter contact. A pivot element is provided for supporting the current cable. A biasing apparatus is provided for urging the pivotally supported current cable into contact with the counter contact.

Description

Elektroöfen, insbesondere Gleichstrom-Lichtbogenöfen, besitzen eine Kontakteinrichtung in ihrem Boden, die während des Einschmelzvorganges den erforderlichen elektrischen Kontakt zum Schrott bzw. zur Schmelze herstellt.Electric furnaces, in particular direct current arc furnaces, have a contact device in their base, which makes the necessary electrical contact with the scrap or the melt during the melting process.

Eine derartige Kontakteinrichtung ist z.B. in der EP-B1 0 058 817 beschrieben.Such a contact device is e.g. described in EP-B1 0 058 817.

Diese Bodenelektroden unterliegen einem im Verhältnis zur Ofenherdausmauerung voreilenden Verschleiß. Da das Auswechseln einzelner Kontaktstäbe einen relativ großen Arbeitsaufwand bedeutet, ist man in der Praxis dazu übergegangen, in entsprechenden Zeitabständen alle Kontaktstäbe gemeinsam auszuwechseln.These floor electrodes 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.

Dieses Auswechseln geschieht vorzugsweise, indem die Bodenelektrode in einem Stück aus dem Ofengefäß entfernt und durch eine neue ersetzt wird. Die Stromkabel verbleiben hierbei aufgehängt am Ofengefäßboden.This replacement is preferably done by removing the bottom electrode in one piece from the furnace vessel and replacing it with a new one. The power cables remain suspended from the bottom of the furnace.

Aus der EP-A1- 0 133 925 ist eine Bodenelektrodenanordnung für einen Gleichstrom-Lichtbogenofen bekannt, die eine einzige Bodenelektrode in mehreren Ausführungsformen, vorzugsweise rund oder auch polygonal, beschreibt, deren Querschnitt sich zum Ofeninneren hin verjüngt, erweitert oder zylindrisch bleibt, um diese von außen in Richtung des Ofengefäßinneren ausbauen zu können.From EP-A1-0 133 925 a base electrode arrangement for a direct current arc furnace is known which describes a single base electrode in several embodiments, preferably round or also polygonal, the cross section of which tapers towards the interior of the furnace, expands or remains cylindrical around it to be able to expand from the outside towards the inside of the furnace.

Zur Stromübertragung in die Bodenelektrode ist das Anschlußstück als eine vorzugsweise aus Kupfer bestehende Kontakthülse ausgebildet. Die Bodenelektrode ist auf den Seitenflächen der Kontakthülse abgestützt und das Anschlußstück ist mit gegen die Elektrode hin geschlossenen Kühlkanälen versehen.For the transmission of current into the bottom electrode, the connecting piece is designed as a contact sleeve, preferably made of copper. The bottom electrode is supported on the side surfaces of the contact sleeve and the connector is provided with cooling channels which are closed towards the electrode.

Die Kontaktlaschen am Anschlußstück der Bodenelektrode werden mittels Schraubverbindungen mit den elektrischen Stromzuführungskabeln verbunden. Diese Laschen sind im Gegensatz zu der Erfindung durch eine Schraubverbindung zu lösen oder zu befestigen.The contact tabs on the connector of the bottom electrode are connected to the electrical power supply cables by means of screw connections. In contrast to the invention, these tabs are to be loosened or fastened by a screw connection.

Aufgabe der Erfindung ist es, eine Aufhängung für die Stromkabel an dem Gegenkontakt der Bodenelektrode zu schaffen, die gleichzeitig auf einfache Weise die für die Stromleitung erforderliche zuverlässige Befestigung zur Bodenelektrode herstellt und die sich verzwängungsfrei möglichen Vesetzungen und Fluchtungsungenauigkeiten anpaßt.The object of the invention is to provide a suspension for the power cable on the mating contact of the bottom electrode, which at the same time in a simple manner produces the reliable attachment to the bottom electrode required for the power line and which adapts without constraint and alignment inaccuracies.

Diese Aufgabe wird nach der Erfindung in der Weise gelöst, wie es in den Patentansprüchen angegeben ist. Die erfindungsgemäße Ausgestaltung der Aufhängevorrichtung zeichnet sich auch dadurch aus, daß auch nach mehrmaligem Wechsel der Bodenelektrode die Kontakteinrichtungen wiederverwendbar sind.This object is achieved according to the invention in the manner as specified in the claims. The configuration of the suspension device according to the invention is also characterized in that the contact devices can be reused even after the bottom electrode has been changed several times.

Ein Ausführungsbeispiel der Stromkabelaufhängung wird nachfolgend anhand der schematischen Zeichnungen näher erläutert.An embodiment of the power cable suspension is explained in more detail with reference to the schematic drawings.

Es zeigen:

Fig. 1
einen Schnitt durch ein Elektroofengefäß,
Fig. 2
einen Schnitt durch die Kabelaufhängung und die Andrückeinrichtung,
Fig. 3
einen Schnitt durch die Kabelaufhängung und die isolierte Befestigung.
Show it:
Fig. 1
a section through an electric furnace vessel,
Fig. 2
a section through the cable suspension and the pressing device,
Fig. 3
a section through the cable suspension and the insulated attachment.

Fig. 1 zeigt das Ofengefäß (1) mit der im Innern befindlichen feuerfesten Ausmauerung (2). Im Zentrum des Ofengefäßbodens ist die Bodenelektrode, bestehend aus Tragplatte (3), Basisplatte (4), Kontaktstäben (5), Gegenkontakt (14) und feuerfester Ausstampfung (6) erkennbar. Die Stromkabel (7) sind an den Laschen (8) befestigt. Mittels Tragbolzen (9) sind die Laschen in einem Spannrahmen (10) aufgehängt.Fig. 1 shows the furnace vessel (1) with the refractory lining (2) located inside. In the center of the furnace bottom, the bottom electrode, consisting of a support plate (3), base plate (4), contact rods (5), counter contact (14) and refractory stamping (6) can be seen. The power cables (7) are attached to the tabs (8). The straps are suspended in a clamping frame (10) by means of supporting bolts (9).

Der Spannrahmen (10) ist an zwei Trägern (11) isoliert befestigt, die ihrerseits am Ofengefäß verankert sind.The tenter frame (10) is fastened to two supports (11), which are in turn anchored to the furnace vessel.

Fig. 2 zeigt die Details der beschriebenen Anordnung. Die Verbindung zwischen den Tragbolzen (9) und der Lasche (8) ist winkelbeweglich, kann z.B. ein Gelenklager sein. Durch die Winkelbeweglichkeit ist es der Lasche möglich, sich ohne Verzwängung exakt an den Gegenkontakt (14) der Bodenelektrode anzulegen. Eine Feder (13), die in dem Spannrahmen (10) eingebaut ist, drückt mittels verschiebbarem Tragbolzen (9) und Gelenklager (12) die Lasche (8) an den Gegenkontakt (14). Das zum Auswechseln der Bodenelektrode notwendige Öffnen der Kontakteinrichtung geschieht auf die Weise, daß von außerhalb des Spannrahmens die Tragbolzen (9) zurückgezogen werden. Hierdurch werden auch die Laschen (8) zurückgezogen und wird der Kontakt geöffnet.Fig. 2 shows the details of the arrangement described. The connection between the support bolts (9) and the bracket (8) is angularly movable, for example, a spherical bearing. Due to the angular mobility, the tab is able to contact the counter contact (14) of the base electrode exactly without squeezing. A spring (13), which is installed in the clamping frame (10), presses the tab (8) against the mating contact (14) by means of displaceable support bolts (9) and articulated bearings (12). The opening of the contact device necessary for replacing the base electrode takes place in such a way that the supporting bolts (9) are withdrawn from outside the clamping frame. This also pulls the tabs (8) back and opens the contact.

In der praktischen Ausgestaltung der Erfindung sind zahlreiche Variationen denkbar. So kann das Andrücken der Laschen anstelle von Federn auch durch hydraulische oder pneumatische Elemente bewirkt werden. Das Zurückziehen der Tragbolzen kann geschehen durch Abdrückschrauben, Keile oder hydraulische oder pneumatische Elemente.Numerous variations are conceivable in the practical embodiment of the invention. So the pressing of the tabs instead of springs can also be effected by hydraulic or pneumatic elements. The support bolts can be retracted using forcing screws, wedges or hydraulic or pneumatic elements.

Fig. 3 zeigt die Vorrichtung in einer um 90 ° gedrehten Schnittdarstellung. Es ist erkennbar, daß der Spannrahmen (10) über eine Schiebeverbindung (15) an den Isolatoren (16) befestigt ist. Mittels dieser Schiebeverbindung kann sich der Spannrahmen (10) beim Andrücken der Laschen (8) selbsttätig nach dem Gegenkontakt (14) ausrichten. Diese durch die Schiebeverbindung und die Winkelbeweglichkeit der Gelenklager erzielte Verzwängungsfreiheit der Laschen (8) sichern diesen ein korrektes Anliegen am Gegenkontakt (14) und eine gleichmäßige Druckverteilung über die gesamte Kontaktfläche.3 shows the device in a sectional view rotated by 90 °. It can be seen that the clamping frame (10) is fastened to the insulators (16) by means of a sliding connection (15). By means of this sliding connection, the clamping frame (10) can automatically align itself with the mating contact (14) when the tabs (8) are pressed on. This freedom from torsion of the tabs (8) achieved by the sliding connection and the angular mobility of the spherical bearings ensure that the tabs (8) are correctly seated against the counter contact (14) and that the pressure is distributed evenly over the entire contact surface.

Die Isolatoren (16) sind an den Trägern (11) angebracht. Die Träger (11) sind am Ofengefäß (1) befestigt. Durch diese Anordnung wird bewirkt, daß der Stromfluß ausschließlich über die Laschen und die Bodenelektrode in die Schmelze erfolgt.The insulators (16) are attached to the carriers (11). The carriers (11) are attached to the furnace vessel (1). This arrangement has the effect that the current flows exclusively into the melt via the tabs and the bottom electrode.

Claims (5)

  1. Metallurgic vessel, particularly an electric furnace, with one or more bottom electrodes (5), to the co-operating contact (14) of which the current cables (7), secured on side bars (8), are connected, characterised in that the side bars (8) form the contact parts for the cooperating contact (14) of the bottom electrode (5); in that the side bars (8) are secured by means of carrier bolts (9) in hinged bearings (12) and are disposed so as to be horizontally displaceable; and in that side bars (8) are pressed by springs (13) against the co-operating contact (14) of the bottom electrode (5).
  2. Metallurgic vessel according to claim 1, characterised in that the side bars (8) are mechanically, pneumatically or hydraulically pressed against the cooperating contact (14) of the bottom electrode (5) by means of carrier bolts (9).
  3. Metallurgic vessel according to claims 1 and 2, characterised in that the side bars (8) are suspended on carrier bolts (9) in a clamping frame (10) which is connected to the vessel (1) by means of carriers (11).
  4. Metallurgic vessel according to claim 1, characterised in that the clamping frame (10) for the side bars (8) is insulated towards the vessel (1) via insulators (16).
  5. Metallurgic vessel according to claims 3 and 4, characterised in that the clamping frame (10) is secured to the insulators (16) via a sliding connection (15).
EP87116369A 1987-01-22 1987-11-06 Metallurgic vessel, particularly an electric furnace with one or more bottom electrodes Expired - Lifetime EP0275384B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116369T ATE64513T1 (en) 1987-01-22 1987-11-06 METALLURGICAL VESSEL, ESPECIALLY ELECTRIC FURNACE WITH ONE OR MORE BOTTOM ELECTRODES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3701678 1986-01-22
DE19873701678 DE3701678A1 (en) 1987-01-22 1987-01-22 METALLURGICAL TANK, ESPECIALLY ELECTRIC OVEN WITH ONE OR MORE FLOOR ELECTRODES

Publications (2)

Publication Number Publication Date
EP0275384A1 EP0275384A1 (en) 1988-07-27
EP0275384B1 true EP0275384B1 (en) 1991-06-12

Family

ID=6319236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116369A Expired - Lifetime EP0275384B1 (en) 1987-01-22 1987-11-06 Metallurgic vessel, particularly an electric furnace with one or more bottom electrodes

Country Status (9)

Country Link
US (1) US4843614A (en)
EP (1) EP0275384B1 (en)
JP (1) JPH076741B2 (en)
AT (1) ATE64513T1 (en)
BR (1) BR8800212A (en)
DE (2) DE3701678A1 (en)
ES (1) ES2022862B3 (en)
MX (1) MX168377B (en)
NO (1) NO171760C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3817379C1 (en) * 1988-05-18 1989-06-22 Mannesmann Ag, 4000 Duesseldorf, De
US5142650A (en) * 1989-11-14 1992-08-25 Asahi Glass Company Ltd. Bottom electrode for a direct current arc furnace
DE69111720T3 (en) * 1990-03-19 2003-05-15 Kawasaki Steel Co DC OVEN FOR MELTING METAL.
DE4108583C2 (en) * 1991-03-14 1997-06-05 Mannesmann Ag Device for coupling the power supply to a metallurgical vessel
DE4236510C2 (en) * 1992-10-26 1996-05-30 Mannesmann Ag Device for melting scrap
FR2750537B1 (en) * 1996-06-27 1998-08-28 Action Finances Ind DEVICE FOR ELECTRICALLY CONNECTING AN ELECTRODE, PARTICULARLY A METALLURGICAL OVEN, WITH RETURN MEANS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH478465A (en) * 1967-11-20 1969-09-15 Boehler & Co Ag Geb Device for connecting electrical lines to electrodes and / or base plates, in particular in systems for electroslag remelting of metals
DE3106741C2 (en) * 1981-02-24 1983-06-16 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 4200 Oberhausen Contact electrode arrangement for arc or resistance melting furnace
CH664059A5 (en) * 1983-07-28 1988-01-29 Bbc Brown Boveri & Cie ELECTRIC OVEN, ESPECIALLY DIRECT ARC FURNACE.

Also Published As

Publication number Publication date
NO171760C (en) 1993-04-28
DE3770798D1 (en) 1991-07-18
NO171760B (en) 1993-01-18
NO880239D0 (en) 1988-01-21
EP0275384A1 (en) 1988-07-27
NO880239L (en) 1988-07-25
ATE64513T1 (en) 1991-06-15
ES2022862B3 (en) 1991-12-16
JPS63259378A (en) 1988-10-26
DE3701678A1 (en) 1988-08-04
JPH076741B2 (en) 1995-01-30
BR8800212A (en) 1988-08-30
MX168377B (en) 1993-05-20
US4843614A (en) 1989-06-27

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