EP0209735A1 - Arc furnace - Google Patents

Arc furnace Download PDF

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Publication number
EP0209735A1
EP0209735A1 EP86108419A EP86108419A EP0209735A1 EP 0209735 A1 EP0209735 A1 EP 0209735A1 EP 86108419 A EP86108419 A EP 86108419A EP 86108419 A EP86108419 A EP 86108419A EP 0209735 A1 EP0209735 A1 EP 0209735A1
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EP
European Patent Office
Prior art keywords
furnace
lifting columns
arc furnace
roller
cover
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.)
Granted
Application number
EP86108419A
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German (de)
French (fr)
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EP0209735B1 (en
Inventor
Joachim Ehle
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Primetals Technologies Germany GmbH
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Fuchs Systemtechnik GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F27D1/1816—Removable covers specially adapted for arc furnaces
    • 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

Definitions

  • the invention relates to an arc furnace according to the preamble of claim 1.
  • An electric arc furnace of this type is itle P age by the magazine EL E K TROW ⁇ RME International, April 1983, no. 2, Issue B, T made famous.
  • Each bar is assigned three roller guides at two different heights, the rollers of which each form an angle of 90 ° to one another. This means that two rollers each lie in a plane that runs parallel to the row arrangement of the lifting columns and determine the distance between the adjacent lifting columns due to their space requirements.
  • roller guides for the lifting columns are fastened together with the cover structure on a portal, which can be swiveled around a vertical pivot and is supported on the platform of the kiln cradle using support wheels.
  • the invention has for its object to provide an arc furnace of the type specified in the preamble of claim 1, which makes it possible to reduce the distance between the lifting columns and thus their space requirements. This should also make it possible to use a commercially available construction for the rotary bearing arrangement of the portal, which makes special manufacture superfluous.
  • the lifting columns on the side facing the furnace cover and on the side facing away from the furnace cover each have two spaced-apart raceways for the rollers of the roller guides, and the raceway surfaces form an angle of less than 180 from the associated roller guides ° is.
  • the lifting columns can be arranged next to each other at a very small distance from one another, because there is no space for the roller guides between the individual lifting columns.
  • the lifting columns are preferably formed with a rectangular cross section and arranged so that the broad sides of adjacent lifting columns are opposite one another at a short distance.
  • the raceways for the rollers are then arranged on the narrow sides of the rectangular cross section.
  • roller slewing ring Due to the small footprint of the floor plan for the lifting columns including the roller guides, it is possible to use a commercially available roller slewing ring, for example is used in excavators and the like, so that there is no need for custom-made.
  • the construction according to the invention is particularly suitable because of its small distance between the lifting columns for an electric arc furnace, in which, according to the earlier application mentioned, the electrode support arms have a layer of copper or another highly conductive material on their outside, through which the high-current conductor for the power supply to the contact jaws contacting the electrode is formed. This makes it possible to achieve the desired small distance between the individual support arms without the need for special projections on the connection points to the lifting columns in the case of the outer electrode support arms.
  • F ig. shows an arc furnace 1 resting on a furnace cradle 2 with an furnace cover 3.
  • the furnace cover 3 closes the arc furnace 1.
  • the cover 3 is pivoted to the side, so that the furnace chamber 4 follows is open at the top and the furnace can be charged.
  • the three-phase arc furnace has three approximately horizontally extending electrode support arms 5, 6 and 7, of which the electrode support yarns 5 and 7 are in a lower level and the electrode support arm 6 is in an upper level.
  • an electrode 9 is fastened with the aid of a clamping device 8, which projects through an associated electrode passage opening in the cover 3 into the furnace chamber 4.
  • the electrode support arms 5, 6 and 7 are provided on at least part of their length on the outside with an electrically highly conductive layer (not shown) which forms the high-current conductor for the current supply to the contact jaw of the associated electrode in this area.
  • cover support arms 10 and 11 are part of a cover support structure which is not shown in all details here.
  • a connector 12 e.g. the lid support arm 11 in connection with a portal 13.
  • the portal 13 is a structure which can be pivoted about a vertical axis A and which not only supports the cover structure but also the entire electrode and electrode holding arrangement.
  • roller guides 14a, 14b Fixedly arranged in the portal 13 are a plurality of roller guides, namely the roller guides 14a, 14b; 15a, 15b and 16a, 16b, to which roller guides are assigned in each case in a lower level, of which the lower roller guides 17a, 17b assigned to the roller guides 14a, 14b can be seen in FIG. 1.
  • each lifting column in the upper roller guide plane is assigned two pairs of rollers 14a and 14b, 15a and 15b as well as 16a and 16b which are rotatably mounted in a bearing block.
  • the lower roller guide level is designed in the same way.
  • the roller guides serve to guide arranged in a series of lifting columns 19, 20 and 21, at their upper ends, the E lektrodentragarme 5, 6 and 7 are fixed.
  • the lifting columns 19, 20 and 21 have a non-square, rectangular cross section with narrow sides a and wide sides b.
  • the wide sides b of adjacent lifting columns lie opposite one another at a short distance, so that the overall width of the arrangement is as small as possible.
  • Each lifting column is assigned two pairs of rollers in two levels, for example the roller guides 14a, 14b are assigned to the lifting column 19 in an upper level and the roller guides 17a, 17b in a lower level, each roller guide containing two rollers 18.
  • the rollers 18 of roller guides respectively assigned to a lifting column form in a plane in plan view in "0", i.e. the axes of rotation of the one pair of rollers, e.g.
  • the rollers assigned to the roller pair of the roller guide 15a form an angle a between them that is smaller than 180 degrees, as seen from the side facing away from the raceway surfaces. This angle is preferably between 90 and 160 degrees. Due to the inclined arrangement of the rollers, the roller bearings can absorb moments about vertical axes.
  • the "O" arrangement of the rollers advantageously increases the lever arm of the pair of forces of the rollers.
  • FIG. 3 shows a simplified horizontal sectional view of the lifting column 21 with the pair of rollers of the roller guide 16a mounted in a bearing block for better illustration.
  • the opposite pair of rollers is not shown in the drawing, so that the design of the lifting column can be seen better. Since the axes of rotation of the two rollers of the roller guide 16a enclose an angle a, as mentioned, the raceways 30 close when they are level extension of the raceway surfaces also an angle a in the range mentioned.
  • the portal 13 is connected via connecting links, not shown here, to a horizontal support 22 below the furnace cradle 2 (FIG. 1).
  • any rotational movement of the gantry 13 is accompanied by a corresponding rotation of the carrier 22.
  • the carrier 22 supports the individual H ubklalen 19, 20 and 21 from.
  • Each lifting column 19, 20 and 21 can be separately moved upwards by means of lifting cylinders (not shown here), so that the attached electrode support arm is also moved upwards and the associated electrode is raised.
  • the portal has a roller slewing ring 23, consisting of a slewing ring lower part 24, which is let into a recess 26 in the furnace cradle 2, and a slewing ring upper part 25.
  • Flanges 27 and 28 of the slewing ring parts take up the roles in their mutually facing sides.
  • the upper slewing ring part 25 can thus be pivoted with respect to the lower, stationary slewing ring part 24 about the vertical axis A (this also corresponds to the central longitudinal axis of the lifting column 20).
  • the roller slewing ring 23 is a commercially available component, as it is e.g. is used in excavators or similar machines.
  • the individual partial take the furnace, the strength in F. 1 outlined location.
  • the lid 3 is pivoted to the side so that the furnace space is accessible.
  • the individual lifting columns 19, 20 and 21 are first moved upwards, at least until the lower ends (not shown in the drawing) of all electrodes lie at least above the upper edge of the furnace vessel and do not collide with the furnace edge when pivoted .
  • the lid 3 is through here Means not shown raised slightly.
  • the lid 3 held by the lid support structure 10, 11 is then pivoted to the side together with the electrode support arms and the electrodes hanging thereon until the furnace interior is free for charging, so that the parts assume the position shown in FIG. 2.
  • the pivoting movement is carried out by rotating the upper turntable part 25 with the aid of drive means not shown here.
  • the furnace is closed in the reverse order of the steps described.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)

Abstract

Zum Chargieren eines Lichtbogenofens wird der Deckel (3) des Ofens etwas angehoben und - von einem Deckeltragwerk (10, 11) gehalten- zur Seite geschwenkt. Das Deckeltragwerk (10, 11) steht in Verbindung mit einem um eine vertikale Achse drehbaren Portal (13). Gleichzeitig werden horizontale Elektrodentragarme (5, 6, 7) mit den an ihren freien Enden befestigten Elektroden zur Seite geschwenkt. Die Elektrodentragarme sind an vertikal verschieblichen Hubsäulen (19, 20, 21) befestigt. Die Hubsäulen sind in einer Ebene angeordnet und besitzen in zwei horizontalen Ebenen liegende Rollenführungen (15a, 15b; 16a, 16b). Die Rollen jedes Rollenpaares (15a, 15b ...) sind so geneigt, daß ihre Drehachsen einen Winkel zwischen 90 und 160 Grad einschließen. Damit können Momente um vertikale Achsen beim Verschwenken der Anordnung und beim Betrieb des Ofens aufgenommen werden. Aufgrund der raumsparenden Anordnung der Rollenführungen und Hubsäulen läßt sich das Portal als Rollendrehkranz ausführen, bei dem es sich um ein handelsübliches Bauelement handeln kann.To charge an arc furnace, the cover (3) of the furnace is raised slightly and - held by a cover support (10, 11) - swung to the side. The cover structure (10, 11) is connected to a portal (13) which can be rotated about a vertical axis. At the same time, horizontal electrode support arms (5, 6, 7) with the electrodes attached to their free ends are pivoted to the side. The electrode support arms are attached to vertically displaceable lifting columns (19, 20, 21). The lifting columns are arranged in one plane and have roller guides (15a, 15b; 16a, 16b) lying in two horizontal planes. The rollers of each pair of rollers (15a, 15b ...) are inclined so that their axes of rotation form an angle between 90 and 160 degrees. This allows moments to be recorded around vertical axes when the arrangement is pivoted and when the furnace is in operation. Due to the space-saving arrangement of the roller guides and lifting columns, the portal can be designed as a roller slewing ring, which can be a commercially available component.

Description

Die Erfindung betrifft einen Lichtbogenofen nach dem Oberbegriff des Anspruchs 1.The invention relates to an arc furnace according to the preamble of claim 1.

Ein Lichtbogenofen dieser Art ist durch die Zeitschrift ELEKTROWÄRME international, April 1983, Nr. 2, Ausgabe B, Titelseite, bekanntgeworden. Es sind hier drei die Elektrodentragarme tragenden Hubsäulen mit kreisförmigem Querschnitt nebeneinander angeordnet von denen jede sowohl auf der dem Ofendeckel zugewandten Seite als auch auf der dem Ofendeckel abgewandten Seite eine Leiste mit rechteckigem Querschnitt aufweist, deren Oberflächen als Laufbahnflächen für die Rollenführungen dienen. Jeder Leiste sind in zwei verschiedenen Höhe jeweils drei Rollenführungen zugeordnet, deren Rollen jeweils einen Winkel von 90° zueinander bilden. Damit liegen jeweils zwei Rollen in einer Ebene die parallel zur Reihenanordnung der Hubsäulen verläuft und bestimmen durch ihren Platzbedarf den Abstand zwischen den benachbarten Hubsäulen.An electric arc furnace of this type is itle P age by the magazine EL E K TROWÄRME International, April 1983, no. 2, Issue B, T made famous. There are three lifting columns with circular cross-section supporting the electrode support arms, each of which has a strip with a rectangular cross-section both on the side facing the furnace lid and on the side facing away from the furnace lid, the surfaces of which serve as raceway surfaces for the roller guides. Each bar is assigned three roller guides at two different heights, the rollers of which each form an angle of 90 ° to one another. This means that two rollers each lie in a plane that runs parallel to the row arrangement of the lifting columns and determine the distance between the adjacent lifting columns due to their space requirements.

Die Rollenführungen für die Hubsäulen sind zusammen mit dem Deckeltragwerk auf einem Portal befestigt, das um einen vertikalen Drehzapfen verschwenkt werden kann und mit Hilfe von Stützrädern auf der Plattform der Ofenwiege gelagert ist.The roller guides for the lifting columns are fastened together with the cover structure on a portal, which can be swiveled around a vertical pivot and is supported on the platform of the kiln cradle using support wheels.

Durch die ältere Patentanmeldung der Anmelderin mit dem Aktenzeichen 85115111.8 ist vorgeschlagen worden die üblichen auf die Elektrodentragarme aufgesetzten Hochstromrohre wenigstens teilweise durch eine Kupferschicht oder eine Schicht aus einem anderen gut leitenden Material zu ersetzen, das auf die Außenseite der Elektrodentragarme aufgebracht ist. Bei einer solchen Ausführung kann der Abstand zwischen den einzelnen Tragarmen verringert werden. Es ist damit erwünscht, auch den üblichen Abstand'zwischen den Hubsäulen, auf denen die Tragarme befestigt sind, zu verringern.The applicant's older patent application, file number 85115111.8, proposed that the usual high-current tubes placed on the electrode support arms be at least partially replaced by a copper layer or a layer of another highly conductive material that is applied to the outside of the electrode support arms. In such an embodiment, the distance between the individual arms can ver be wrested. It is therefore desirable to reduce the usual distance between the lifting columns on which the support arms are attached.

Der Erfindung liegt die Aufgabe zugrunde, einen Lichtbogenofen der im Oberbegriff des Anspruchs 1 angegebenen Art zu schaffen, der es ermöglicht, den Abstand der Hubsäulen und damit deren Platzbedarf zu verringern. Es soll hierdurch für die Drehl-ageranordnung des Portals auch der Einsatz einer handelsüblichen Konstruktion ermöglicht werden, die eine Spezialanfertigung überflüssig macht.The invention has for its object to provide an arc furnace of the type specified in the preamble of claim 1, which makes it possible to reduce the distance between the lifting columns and thus their space requirements. This should also make it possible to use a commercially available construction for the rotary bearing arrangement of the portal, which makes special manufacture superfluous.

Diese Aufgabe wird durch die im Patentanspruch 1 angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the features specified in claim 1. Advantageous developments of the invention are specified in the subclaims.

Bei dem erfindungsgemäßen Lichtbogenofen weisen die Hubsäulen auf der dem Ofendeckel zugewandten Seite und auf der dem Ofendeckel abgewandten Seite jeweils zwei im Abstand voneinander angeordnete Laufbahnen für die Rollen der Rollenführungen auf und die Laufbahnflächen schließen von den zugehörigen Rollenführungen aus gesehen einen Winkel ein der kleiner als 180° ist. Damit können die Hubsäulen mit sehr geringem Abstand voneinander nebeneinander angeordnet werden, weil zwischen den einzelnen Hubsäulenkein Platz für die Rollenführungen vorgesehen werden muß. Vorzugsweise werden die Hubsäulen mit rechteckigem Querschnitt ausgebildet und so angeordnet, daß die Breitseiten benachbarter Hubsäulen mit geringem Abstand einander gegenüberliegen. Die Laufbahnen für die Rollen sind dann an den Schmalseiten des rechteckigen Querschnitts angeordnet.In the arc furnace according to the invention, the lifting columns on the side facing the furnace cover and on the side facing away from the furnace cover each have two spaced-apart raceways for the rollers of the roller guides, and the raceway surfaces form an angle of less than 180 from the associated roller guides ° is. This means that the lifting columns can be arranged next to each other at a very small distance from one another, because there is no space for the roller guides between the individual lifting columns. The lifting columns are preferably formed with a rectangular cross section and arranged so that the broad sides of adjacent lifting columns are opposite one another at a short distance. The raceways for the rollers are then arranged on the narrow sides of the rectangular cross section.

Durch den geringen Bedarf an Grundrißfläche für die Hubsäulen einschließlich der Rollenführungen ist es möglich, einen handelsüblichen Rollendrehkranz, wie er zum Beispiel bei Baggern und dergleichen verwendet wird, einzusetzen, so daß auf eine Spezialanfertigung verzichtet werden kann.Due to the small footprint of the floor plan for the lifting columns including the roller guides, it is possible to use a commercially available roller slewing ring, for example is used in excavators and the like, so that there is no need for custom-made.

Besonders geeignet ist die erfindungsgemäße Konstruktion wegen ihres kleinen Abstandes zwischen den Hubsäulen für einen Lichtbogenofen, bei dem entsprechend der genannten älteren Anmeldung die Elektrodentragarme auf ihrer Außenseite eine Schicht aus Kupfer oder einem anderen gut leitenden Material aufweisen, durch die der Hochstromleiter für die Stromzufuhr zu den an der Elektrode anliegenden Kontaktbacken gebildet wird. Es wird hierdurch ermöglicht, den gewünschten kleinen Abstand zwischen den einzelnen Tragarmen zu realisieren, ohne daß bei den äußeren Elektrodentragarmen besondere Auskragungen an den Verbindungsstellen zu den Hubsäulen erforderlich sind.The construction according to the invention is particularly suitable because of its small distance between the lifting columns for an electric arc furnace, in which, according to the earlier application mentioned, the electrode support arms have a layer of copper or another highly conductive material on their outside, through which the high-current conductor for the power supply to the contact jaws contacting the electrode is formed. This makes it possible to achieve the desired small distance between the individual support arms without the need for special projections on the connection points to the lifting columns in the case of the outer electrode support arms.

Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 eine Seitenansicht eines Teils eines Lichtbogenofens mit teilweise weggebrochenen Teilen,
  • Fig. 2 eine Draufsicht auf den Lichtbogenofen nach Fig. 1, wobei ebenfalls einige Teile weggebrochen sind, und
  • Fig. 3 eine vereinfachte Horizontalschnittansicht einer Hubsäule mit Laufbahnen.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Show it:
  • 1 is a side view of part of an arc furnace with parts broken away,
  • Fig. 2 is a plan view of the arc furnace of FIG. 1, with some parts broken away, and
  • Fig. 3 is a simplified horizontal sectional view of a lifting column with raceways.

Fig. zeigt einen auf einer Ofenwiege 2 ruhenden Lichtbogenofen 1 mit einem Ofendeckel 3. In der Darstellung nach Fig. 1 verschließt der Ofendeckel 3 den Lichtbogenofen 1. In der Darstellung nach Fig. 2 ist der Deckel 3 zur Seite verschwenkt, so daß der Ofenraum 4 nach oben offen ist und eine Chargierung des Ofens vorgenommen werden kann. F ig. shows an arc furnace 1 resting on a furnace cradle 2 with an furnace cover 3. In the representation according to FIG. 1, the furnace cover 3 closes the arc furnace 1. In the representation according to FIG. 2, the cover 3 is pivoted to the side, so that the furnace chamber 4 follows is open at the top and the furnace can be charged.

Der Drei-Phasen-Lichtbogenofen weist drei etwa horizontal verlaufende Elektrodentragarme 5, 6, und 7 auf, von denen die Elektrodentragarne5 und 7 in einer unteren Ebene und der Elektrodentragarm 6 in einer oberen Ebene liegt. An den Enden oberhalb des Ofens 1 ist jeweils mit Hilfe einer Einspannvorrichtung 8 eine Elektrode 9 befestigt, die durch eine zugehörige Elektrodendurchführöffnung im Deckel 3 hindurch in den Ofenraum 4 hineinragt. Die Elektrodentragarme 5, 6 und 7 sind wenigstens auf einem Teil ihrer Länge an der Außenseite mit einer elektrisch gut leitenden Schicht (nicht dargestellt) versehen, die in diesem Bereich den Hochstromleiter für die Stromzufuhr zur Kontaktbacke der zugehörigen Elektrode bildet.The three-phase arc furnace has three approximately horizontally extending electrode support arms 5, 6 and 7, of which the electrode support yarns 5 and 7 are in a lower level and the electrode support arm 6 is in an upper level. At the ends above the furnace 1, an electrode 9 is fastened with the aid of a clamping device 8, which projects through an associated electrode passage opening in the cover 3 into the furnace chamber 4. The electrode support arms 5, 6 and 7 are provided on at least part of their length on the outside with an electrically highly conductive layer (not shown) which forms the high-current conductor for the current supply to the contact jaw of the associated electrode in this area.

Zwei etwa horizontal verlaufende Deckeltragarme 10 und 11 sind Bestandteil eines hier nicht in allen Einzelheiten dargestellten Deckeltragwerks. Mit Hilfe eines Verbindungsstücks 12 steht z.B. der Deckeltragarm 11 mit einem Portal 13 in Verbindung. Das Portal 13 ist eine um eine vertikale Achse A schwenkbare Konstruktion, die nicht nur das Deckeltragwerk, sondern auch die gesamte Elektroden- und Elektrodenhalteanordnung trägt.Two approximately horizontally extending cover support arms 10 and 11 are part of a cover support structure which is not shown in all details here. With the help of a connector 12, e.g. the lid support arm 11 in connection with a portal 13. The portal 13 is a structure which can be pivoted about a vertical axis A and which not only supports the cover structure but also the entire electrode and electrode holding arrangement.

Fest in dem Portal 13 angeordnet befinden sich mehrere Rollenführungen, und zwar in einer oberen Ebene die Rollenführungen 14a, 14b; 15a, 15b und 16a, 16b, denen in einer unteren Ebene jeweils Rollenführungen zugeordnet sind, von denen in Fig. 1 die den Rollenführungen 14a, 14b zugeordneten unteren Rollenführungen 17a, 17b zu sehen sind.Fixedly arranged in the portal 13 are a plurality of roller guides, namely the roller guides 14a, 14b; 15a, 15b and 16a, 16b, to which roller guides are assigned in each case in a lower level, of which the lower roller guides 17a, 17b assigned to the roller guides 14a, 14b can be seen in FIG. 1.

Wie in Fig. 2 dargestellt ist, sind jeder Hubsäule in der oberen Rollenführungsebene zwei in jeweils einem Lagerblock drehbar gelagerte Rollenpaare 14a und 14b, 15a und 15b sowie 16a und 16b zugeordnet. Die untere Rollenführungsebene ist in gleicher Weise ausgebildet.As shown in FIG. 2, each lifting column in the upper roller guide plane is assigned two pairs of rollers 14a and 14b, 15a and 15b as well as 16a and 16b which are rotatably mounted in a bearing block. The lower roller guide level is designed in the same way.

Die Rollenführungen dienen zur Führung von in einer Reihe angeordneten Hubsäulen 19, 20 und 21, an deren oberen Enden die Elektrodentragarme 5, 6 bzw. 7 befestigt sind. Wie aus den Fig. 2 und 3 ersichtlich, besitzen die Hubsäulen 19, 20 und 21 nicht-quadratischen, rechteckigen Querschnitt mit schmalen Seiten a und breiten Seiten b. Die breiten Seiten b benachbarter Hubsäulen liegen mit geringem Abstand einander gegenüber, so daß die Gesamtbreite der Anordnung möglichst gering ist. Jeder Hubsäule sind jeweils in zwei Ebenen zwei Rollenpaare zugeordnet, beispielsweise sind der Hubsäule 19 in einer oberen Ebene die Rollenführungen 14a, 14b und in einer unteren Ebene die Rollenführungen 17a, 17b zugeordnet, wobei jede Rollenführung zwei Rollen 18 enthält.The roller guides serve to guide arranged in a series of lifting columns 19, 20 and 21, at their upper ends, the E lektrodentragarme 5, 6 and 7 are fixed. As can be seen from FIGS. 2 and 3, the lifting columns 19, 20 and 21 have a non-square, rectangular cross section with narrow sides a and wide sides b. The wide sides b of adjacent lifting columns lie opposite one another at a short distance, so that the overall width of the arrangement is as small as possible. Each lifting column is assigned two pairs of rollers in two levels, for example the roller guides 14a, 14b are assigned to the lifting column 19 in an upper level and the roller guides 17a, 17b in a lower level, each roller guide containing two rollers 18.

Wie aus Fig. 2 ersichtlich, bilden die einer Hubsäule jeweils zugeordneten Rollen 18 von Rollenführungen in einer Ebene imGrundrißein "0", das heißt, die Drehachsen der einem Rollenpaar, z.B. dem Rollenpaar der Rollenführung 15a zugeordneten Rollen, schließen von der den Laufbahnflächen abgewandten Seite aus gesehen zwischen sich einen Winkel a ein, der kleiner ist als 180 Grad. Dieser Winkel liegt vorzugsweise zwischen 90 und 160 Grad. Durch die geneigte Anordnung der Rollen können die Rollenlager Momente um vertikale Achsen aufnehmen. Die "O"-Anordnung der Rollen vergrößert den Hebelarm des Kräftepaares der Rollen vorteilhaft.As can be seen from Fig. 2, the rollers 18 of roller guides respectively assigned to a lifting column form in a plane in plan view in "0", i.e. the axes of rotation of the one pair of rollers, e.g. The rollers assigned to the roller pair of the roller guide 15a form an angle a between them that is smaller than 180 degrees, as seen from the side facing away from the raceway surfaces. This angle is preferably between 90 and 160 degrees. Due to the inclined arrangement of the rollers, the roller bearings can absorb moments about vertical axes. The "O" arrangement of the rollers advantageously increases the lever arm of the pair of forces of the rollers.

Fig. 3 zeigt zur besseren Veranschaulichung eine vereinfachte Horizontalschnittansicht der Hubsäule 21 mit dem in einem Lagerblock gelagerten Rollenpaar der Rollenführung 16a. Das gegenüberliegende Rollenpaar ist in der Zeichnung nicht dargestellt, damit die Ausgestaltung der Hubsäule besser erkennbar ist. Da die Drehachsen der beiden Rollen der Rollenführung 16a - wie gesagt - einen Winkel a einschließen, schließen die Laufbahnen 30 bei ebener Ausbildung der Laufbahnflächen ebenfalls einen Winkel a in dem genannten Bereich ein.FIG. 3 shows a simplified horizontal sectional view of the lifting column 21 with the pair of rollers of the roller guide 16a mounted in a bearing block for better illustration. The opposite pair of rollers is not shown in the drawing, so that the design of the lifting column can be seen better. Since the axes of rotation of the two rollers of the roller guide 16a enclose an angle a, as mentioned, the raceways 30 close when they are level extension of the raceway surfaces also an angle a in the range mentioned.

Das Portal 13 steht über hier nicht dargestellte Verbindungsglieder in Verbindung mit einem Horizontalträger 22 unterhalb der Ofenwiege 2 (Fig. 1). Jede Drehbewegung des Portals 13 geht also einher mit einer entsprechenden Drehbewegung des Trägers 22. Der Träger 22 stützt die einzelnen Hubsäulen 19, 20 und 21 ab. Über hier nicht dargestellte Hubzylinder läßt sich jede Hubsäule 19, 20 und 21 separat nach oben fahren, so daß der daran befestigte Elektrodentragarm ebenfalls nach oben bewegt und die zugehörige Elektrode hochgefahren wird.The portal 13 is connected via connecting links, not shown here, to a horizontal support 22 below the furnace cradle 2 (FIG. 1). Thus, any rotational movement of the gantry 13 is accompanied by a corresponding rotation of the carrier 22. The carrier 22 supports the individual H ubsäulen 19, 20 and 21 from. Each lifting column 19, 20 and 21 can be separately moved upwards by means of lifting cylinders (not shown here), so that the attached electrode support arm is also moved upwards and the associated electrode is raised.

Das Portal besitzt einen Rollendrehkranz 23, bestehend aus einem Drehkranz-Unterteil 24, das in einer Ausnehmung 26 der Ofenwiege 2 eingelassen ist, und einem Drehkranz-Oberteil 25. Flansche 27 und 28 der Drehkranzteile nehmen in ihren einander zugewandten Seiten die Rollen auf. Das obere Drehkranzteil 25 läßt sich also in bezug auf das untere, feststehende Drehkranzteil 24 um die vertikale Achse A (diese entspricht auch der Mittel-Längsachse der Hubsäule 20) verschwenken. Bei dem Rollendrehkranz 23 handelt es sich um ein handelsübliches Bauteil, wie es z.B. in Baggern oder ähnlichen Maschinen verwendet wird.The portal has a roller slewing ring 23, consisting of a slewing ring lower part 24, which is let into a recess 26 in the furnace cradle 2, and a slewing ring upper part 25. Flanges 27 and 28 of the slewing ring parts take up the roles in their mutually facing sides. The upper slewing ring part 25 can thus be pivoted with respect to the lower, stationary slewing ring part 24 about the vertical axis A (this also corresponds to the central longitudinal axis of the lifting column 20). The roller slewing ring 23 is a commercially available component, as it is e.g. is used in excavators or similar machines.

Im Betrieb nehmen die einzelnen Teil des Ofens die in Fig. 1 skizzierte Lage ein. Zum Chargieren wird der Deckel 3 zur Seite geschwenkt, so daß der Ofenraum zugänglich ist. Hierzu werden zunächst die einzelnen Hubsäulen 19, 20 und 21 nach oben gefahren, und zwar zumindest so weit, bis die (in der Zeichnung nicht dargestellten) unteren Enden sämtlicher Elektroden zumindest oberhalb des oberen Rands des Ofengefäßes liegen und beim Verschwenken nicht mit dem Ofenrand kollidieren. Sodann wird der Deckel 3 durch hier nicht näher dargestellte Mittel etwas angehoben. Der von dem Deckeltragwerk 10, 11 gehaltene Deckel 3 wird dann zusammen mit den Elektrodentragarmen und den daran hängenden Elektroden zur Seite geschwenkt, bis der Ofeninnenraum zum Chargieren frei ist, so daß die Teile die in Fig. 2 dargestellte Lage einnehmen. Die Schwenkbewegung wird vollzogen durch Drehen des Drehkranz-Oberteils 25 mit Hilfe hier nicht näher dargestellter Antriebsmittel.In operation, the individual partial take the furnace, the strength in F. 1 outlined location. For charging, the lid 3 is pivoted to the side so that the furnace space is accessible. For this purpose, the individual lifting columns 19, 20 and 21 are first moved upwards, at least until the lower ends (not shown in the drawing) of all electrodes lie at least above the upper edge of the furnace vessel and do not collide with the furnace edge when pivoted . Then the lid 3 is through here Means not shown raised slightly. The lid 3 held by the lid support structure 10, 11 is then pivoted to the side together with the electrode support arms and the electrodes hanging thereon until the furnace interior is free for charging, so that the parts assume the position shown in FIG. 2. The pivoting movement is carried out by rotating the upper turntable part 25 with the aid of drive means not shown here.

Das Verschließen des Ofens erfolgt sinngemäß in umgekehrter Reihenfolge der beschriebenen Schritte.The furnace is closed in the reverse order of the steps described.

Claims (6)

1. Lichtbogenofen (1), mit mehreren, insbesondere drei, Elektrodentragarmen (5, 6, 7), die jeweils an je einer, in Rollenführungen (14a, 14b; 15a, 15b; 16a, 16b; 17a, 17b) etwa vertikal bewegbaren Hubsäule (19, 20, 21) befestigt sind, wobei die nebeneinander, in einer Reihe angeordneten Hubsäulen (19, 20 21) sowohl auf der dem Ofendeckel (3) zugewandten Seite als auch auf der dem Ofendeckel (3) abgewandten Seite jeweils mehrere Laufbahnen (30) für die Rollen (18) der Rollenführungen (14a, 14b; 15a, 15b; 16a, 16b; 17a, 17b) aufweisen, mit einem Deckeltragwerk (10, 11), das den Ofendeckel (3) trägt, wenn dieser zum Chargieren des Ofens bei hochgefahrenen Elektrodentragarmen (5, 6, 7) angehoben und zur Seite verschwenkt wird, und mit einem neben dem Ofen (1) angeordneten, um eine vertikale Achse (A) schwenkbaren Portal (13), das auf Rollen gelagert ist und das das Deckeltragwerk (10, 11) sowie die Rollenführungen für die Hubsäulen trägt, dadurch gekennzeichnet , daß auf den genannten Seiten jeder Hubsäule jeweils zwei Laufbahnen (30) vorhanden sind, deren Laufbahnflächen von den zugehörigen Rollenführungen (14a, 14b; 15a, 15b; 16a, 16b; 17a, 17b) aus gesehen, einen Winkel (a) einschließen, der kleiner als 180° ist, und daß das Portal (13) auf einem Rollendrehkranz (23) gelagert ist, der die Hubsäulen (19, 20, 21) umschließt.1. arc furnace (1), with several, in particular three, E lektrodentragarmen (5, 6, 7) each to in each case one, in roller guides (14a, 14b; 15a, 15b; 16a, 16b; 17a, 17b) approximately vertically movable lifting column (19, 20, 21) are mounted, said side by side, arranged in a row H ubsäulen (19, 20, 21) on both of the furnace cover (3) facing side as well as on the furnace cover (3) side facing away from each have a plurality of raceways (30) for the rollers (18) of the roller guides (14a, 14b; 15a, 15b; 16a, 16b; 17a, 17b), with a cover structure (10, 11) which supports the furnace cover (3) if this is raised and charged to the side for charging the furnace when the electrode support arms (5, 6, 7) are raised, and with a portal (13) which is arranged next to the furnace (1) and can be pivoted about a vertical axis (A) and is mounted on rollers is and which carries the cover structure (10, 11) and the roller guides for the lifting columns, characterized in that on said Se There are two raceways (30) in each lifting column, the raceway surfaces of which are guided by the associated roller guides (14a, 14b; 15a, 15b; 16a, 16b; 17a, 17b) seen from an angle (a), which is less than 180 °, and that the portal (13) is mounted on a roller slewing ring (23) which surrounds the lifting columns (19, 20, 21). 2. Lichtbogenofen nach Anspruch 1, dadurch gekennzeichnet , daß die beiden Laufbahnflächen (30) einer Seite einen Winkel (a) von 90° bis 160° einschließen.2. Arc furnace according to claim 1, characterized in that the two raceway surfaces (30) enclose an angle (a) of 90 ° to 160 ° on one side. 3. Lichtbogenofen nach Anspruch 1 oder 2, dadurch gekennzeichnet , daß die Hubsäulen (19,20,21) einen rechteckigen Querschnitt mit schmalen Seiten (a) und breiten Seiten (b) aufweisen, und daß die breiten Seiten (b) benachbarter Hubsäulen mit geringem Abstand einander gegenüberliegen.3. Arc furnace according to claim 1 or 2, characterized in that the lifting columns (19, 20, 21) have a rectangular cross section with narrow sides (a) and wide sides (b), and that the wide sides (b) of adjacent lifting columns are opposite each other at a short distance. 4. Lichtbogenofen nach Anspruch 3, dadurch gekennzeichnet , daß die Laufbahnflächen (30) an den Rändern der schmalen Seiten (a) vorgesehen sind.4. Arc furnace according to claim 3, characterized in that the raceway surfaces (30) are provided on the edges of the narrow sides (a). 5. Lichtbogenofen nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Rollendrehkranz (23) ein zylindrisches Oberteil (25) und ein zylindrisches, drehfest auf der Ofenwiege angeordnetes Unterteil (24) aufweist.5. Arc furnace according to one of claims 1 to 4, characterized in that the roller slewing ring (23) has a cylindrical upper part (25) and a cylindrical, non-rotatably arranged on the furnace cradle lower part (24). 6. Lichtbogenofen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet , daß die Elektrodentragarme (5, 6, 7) wenigstens auf einem Teil ihrer Länge an der Außenseite mit einer elektrisch gut leitenden Schicht aus Kupfer oder dergleichen versehen sind, die in diesem Bereich den Hochstromleiter für die Stromzufuhr zur Kontaktbacke der zugehörigen Elektrode bildet.6. Arc furnace according to one of claims 1 to 5, characterized in that the electrode support arms (5, 6, 7) are provided on at least part of their length on the outside with an electrically highly conductive layer of copper or the like, which in this area forms the high-current conductor for the power supply to the contact jaw of the associated electrode.
EP86108419A 1985-06-24 1986-06-20 Arc furnace Expired - Lifetime EP0209735B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3522559 1985-06-24
DE3522559A DE3522559C1 (en) 1985-06-24 1985-06-24 Arc furnace

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EP0209735A1 true EP0209735A1 (en) 1987-01-28
EP0209735B1 EP0209735B1 (en) 1990-04-18

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EP86108419A Expired - Lifetime EP0209735B1 (en) 1985-06-24 1986-06-20 Arc furnace

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US (1) US4674102A (en)
EP (1) EP0209735B1 (en)
DE (2) DE3522559C1 (en)
ES (1) ES8706935A1 (en)

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WO2012041947A1 (en) * 2010-09-30 2012-04-05 Siemens Aktiengesellschaft Lift and pivot device for a cover of a furnace and furnace system and method for charging and servicing such a furnace system

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AT387350B (en) * 1987-05-15 1989-01-10 Voest Alpine Ag ELECTRIC OVENS, LIKE ARC OVENS OR PLASMA OVENS
DE4236158C1 (en) * 1992-10-20 1994-03-17 Mannesmann Ag Electrode support arm for arc furnaces
AT401304B (en) * 1993-11-04 1996-08-26 Voest Alpine Ind Anlagen LID LIFT FOR A LID TO BE INSTALLED ON A METALLURGICAL VESSEL
AU4170997A (en) * 1996-08-30 1998-03-19 Melttran, Inc. Rotating-translational drive mechanism for positioning devices in a melter
DE102008012280A1 (en) * 2008-03-03 2009-09-10 Fuchs Technology Ag Arc furnace
RU2448317C2 (en) * 2009-10-01 2012-04-20 Закрытое акционерное общество "ТЭК-98" (ЗАО "ТЭК-98") Electric furnace for metal heating and melting
DE102011119797A1 (en) 2011-11-23 2013-05-23 Sms Siemag Ag Electric arc furnace with a furnace lid support arm system

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WO2012041947A1 (en) * 2010-09-30 2012-04-05 Siemens Aktiengesellschaft Lift and pivot device for a cover of a furnace and furnace system and method for charging and servicing such a furnace system
CN103080680A (en) * 2010-09-30 2013-05-01 西门子公司 Lift and pivot device for a cover of a furnace and furnace system and method for charging and servicing such a furnace system
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US9429363B2 (en) 2010-09-30 2016-08-30 Primetals Technologies Austria GmbH Lift and pivot device for a cover of a furnace and furnace system and method for charging and servicing such a furnace system

Also Published As

Publication number Publication date
US4674102A (en) 1987-06-16
DE3522559C1 (en) 1987-01-22
ES8706935A1 (en) 1987-07-01
DE3670532D1 (en) 1990-05-23
EP0209735B1 (en) 1990-04-18
ES556267A0 (en) 1987-07-01

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