EP0203339B1 - Device to raise and pivot the top of an arc furnace - Google Patents

Device to raise and pivot the top of an arc furnace Download PDF

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Publication number
EP0203339B1
EP0203339B1 EP86105214A EP86105214A EP0203339B1 EP 0203339 B1 EP0203339 B1 EP 0203339B1 EP 86105214 A EP86105214 A EP 86105214A EP 86105214 A EP86105214 A EP 86105214A EP 0203339 B1 EP0203339 B1 EP 0203339B1
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EP
European Patent Office
Prior art keywords
cover
lifting
pivot axis
carrier member
edge
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
EP86105214A
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German (de)
French (fr)
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EP0203339A3 (en
EP0203339A2 (en
Inventor
Joachim Dipl.-Ing. Ehle
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Primetals Technologies Germany GmbH
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Fuchs Systemtechnik GmbH
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Application filed by Fuchs Systemtechnik GmbH filed Critical Fuchs Systemtechnik GmbH
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Publication of EP0203339A3 publication Critical patent/EP0203339A3/en
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Classifications

    • 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
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • F27B3/16—Walls; Roofs
    • 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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/08—Heating by electric discharge, e.g. arc discharge
    • F27D11/10—Disposition of electrodes

Definitions

  • the invention relates to a lifting and swiveling device for the lid of the furnace vessel which is arranged on the side of the furnace vessel of an arc furnace and which contains a lifting and lowering support member which engages on the edge of the lid.
  • a lid support structure is usually provided, which is supported on a rotating portal supporting the lifting columns of the electrode support arms of the electric arc furnace and contains two projecting support arms which extend to the cover on both sides of the electrode support arms and by 4 or sometimes 3 bolts with the Lid are connected.
  • the lids or at least parts of the lids of arc furnaces have been designed as water-cooled elements and, since these elements are electrically conductive, there is the problem of adequate electrical insulation of the lid from the lid structure, if this is connected to the lid during furnace operation. If elements of the lid, such as the particularly stressed center piece, or the entire lid are to be replaced, this requires the lifting and swiveling device or the lid support to be released from the lid, which is not only time-consuming but also for the workers concerned because of the high level Temperatures near the lid is also arduous and dangerous.
  • the invention has for its object to ensure good electrical insulation of this device with respect to the furnace cover and to prevent undesirable leakage currents between the cover and this device in a lifting and swiveling device of the type mentioned in the preamble of claim 1 without great design effort. Furthermore, the replacement of the lid or parts of the lid is to be simplified and the time required for this is to be shortened. The exchange process should be able to be carried out without workers having to go into the immediate vicinity of the furnace vessel to solve the connection between the lifting and swiveling device and the lid.
  • the arc furnace 1 shown in FIGS. 1 and 2 contains a furnace vessel 2 with water-cooled walls, as described for example in DE-OS 28 24 821.
  • a lid 4 On an upper water-bearing ring 3 of this furnace vessel, the edge of a lid 4, which, as indicated in FIG. 2, has a water-cooled outer support ring 5 for water-cooled elements arranged within this support ring.
  • two claws 13 and 14 which can be pivoted about a horizontal pivot axis 12 are provided as the lifting and pivoting device for the furnace cover 4, which in the lowered position shown in dash-dotted lines in FIG. 1 - identified by 13 '- from the edge of the cover 4 are loosened and engage each time in the lifting eye 15 or 16 adapted to the shape of the swivel claws on the edge of the cover 4.
  • the lifting movement of the swiveling claws 13 and 14 is effected in the exemplary embodiment by hydraulically actuated linear drives 17 which are rotatably mounted in the swiveling claw 13 and 14 in question and on the platform of the portal 6.
  • the drives of the swivel claws 13 and 14 must be designed such that they are able to lift the lid 4 from the furnace vessel 2 after the swivel claws have engaged in the associated lifting eyes 15 and 16.
  • the corresponding position of the swivel claw 13 is also shown in dash-dotted lines in FIG. 1 and is designated by 13 ".
  • Each swivel claw contains a lower thrust bearing 18 on the side facing the cover 4 and a higher upper thrust bearing 19 on the side facing away from the cover. For reasons of clarity, the two thrust bearings are only marked when the swivel claw 13 'is lowered.
  • These Thrust bearings are in contact with the pivoting claws 13 and 14 in the associated lifting eyes 15 and 16 on adapted counter bearings 20 and 21 respectively.
  • the horizontal pivot axis 12 in an adjustable eccentric disk (not shown), or the thrust bearings 18/19 or the associated counter bearings 20/21 can be provided with interchangeable spacer plates (not shown).
  • the upper thrust bearing 19 and the associated counter bearing 21 are preferably designed as inclined surfaces which, in the engagement position of the pivotable claw shown by a solid line, with the cover 4 resting on the furnace vessel 2 at an angle of 5 ° to 20 ° are preferably inclined by 10 ° with respect to a vertical plane. This angle is indicated in Fig. 1 and designated a.
  • the horizontal swivel axis 12 is arranged at a height which is the height between the upper edge and lower edge of the lid 4 resting on the furnace vessel 2 corresponds.
  • the horizontal pivot axis 12 is preferably arranged at a height which corresponds to the height between the upper edge and lower edge of the electrode bushings in the cover 4, which are not shown in the figure. If the height of the swivel axis is at a height that corresponds to the center between the upper edge and lower edge of the electrode feedthroughs in the lid, then the horizontal displacement of the electrode feedthroughs when the lid is lifted is minimized.
  • the lifting eyes 15 and 16 are provided in the described embodiment in support arms 22 and 23 which are fixedly connected to the cover ring 5.
  • the two swiveling claws 13 and 14 are connected to one another to ensure a synchronous movement by a transverse shaft 29, which is preferably designed as a hollow shaft.
  • the cover 4 rests on the furnace vessel 2 and the swiveling claws 13 and 14 are in the lower position 13 'shown in dash-dotted lines. If the lid is to be lifted and pivoted to the side, the linear drives 17 of the two pivoting claws 13 and 14 are actuated and these are moved synchronously upwards into the engagement position shown in solid lines.
  • the swiveling claws 13 and 14 engage in the lifting eyes 15 and 16 and when the thrust bearings 18 and 19 and the associated counter bearings 20 and 21 are precisely adjusted, they come into mutual contact at the same time.
  • the cover 4 is raised about the swiveling axis 12 up to the position shown in broken lines.
  • the swivel claws are located above the water-cooled ring 3, i.e. above the upper edge of the furnace vessel 2 and can be swung freely to the side together with the lid.
  • This swiveling movement takes place by rotating the rotary portal 6 about the vertical swiveling axis 7.
  • the electrode arms are swiveled, which were previously raised to a position in which the swiveling movement of the electrodes is not impeded by the upper edge of the vessel.
  • the cover is swiveled back laterally by turning back the rotary portal 6 and lowering the cover 4 onto the furnace vessel 2 by actuating the linear drive 17 in the reverse direction after the mechanical locking has been eliminated. If the cover 4 or a part of the cover, such as a cooling element carried by the outer support ring 5, is to be replaced, the pivoting claws are pivoted to the side together with the electrode support arms in the lower, disengaged position 13 ′′ after the electrode support arms 10 have been raised by means of the rotary portal 6 The lid 4 lying on the furnace vessel is thus accessible from above and parts thereof or the entire lid can be lifted off and replaced with new parts.
  • a lifting ram 24 is provided as a lifting and lowering support member instead of the two swiveling claws 13 and 14.
  • the parts of the second exemplary embodiment which correspond to those of the first are provided with the same reference numerals and reference is made to the explanation given for the first exemplary embodiment of these parts.
  • the lifting ram 24 is fastened on the platform of the rotary portal 6, specifically, as can be seen in FIG. 4, on the side of the electrode support arms.
  • the cover 4 can be pivoted laterally into the position shown in dash-dotted lines in FIG. 4.
  • the lifting plunger can be secured against rotation with respect to the rotating portal, for example, by a vertical groove in the rotating portal into which a pin inserted laterally on the lifting plunger 24 engages.
  • the lifting plunger 24 is secured against rotation with respect to the cover 4 in the exemplary embodiment by a flattened portion 25 of the lifting die, which is approximately vertical and rests on a correspondingly designed counter surface in the area of the lifting eye.
  • the lifting ram 24 can be lowered from the engagement position shown into a release position releasing the cover and can also be raised from the position shown while taking the cover with it so that it can be swung freely to the side when the rotary portal is rotated.
  • the operation of the second game perennial corresponds to that of the first embodiment. Reference is made to the explanation given for this example.
  • the third exemplary embodiment according to FIGS. 5 and 6 differs from the second exemplary embodiment in that instead of one lifting ram 24 two lifting rams 26 and 27 are provided. So that a lateral pivoting of the cover 4 into the pivoted-out position indicated by the dashed line in FIG. 6 is possible without the pivoting movement being impeded, the vertical pivot axis 7 of the rotary portal 6 must lie outside the axis of symmetry 28 between the two lifting pistons 26 and 27 (see Fig. 6). The position is determined by the fact that the lifting ram 27 can be guided past the furnace vessel when the rotary portal is rotated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Description

Die Erfindung betrifft eine seitlich des Ofengefäßes eines Lichtbogenofens angeordnete Hub- und Schwenkvorrichtung für den Deckel des Ofengefäßes, die ein heb- und senkbares Tragglied enthält, das am Deckelrand angreift.The invention relates to a lifting and swiveling device for the lid of the furnace vessel which is arranged on the side of the furnace vessel of an arc furnace and which contains a lifting and lowering support member which engages on the edge of the lid.

Der Deckel eines Lichtbogenofens muß zum Chargieren des Ofens im allgemeinen angehoben und zur Seite geschwenkt werden. Zu diesem Zweck ist üblicherweise ein Deckeltragwerk vorgesehen, das sich auf einem die Hubsäulen der Elektrodentragarme des Lichtbogenofens tragenden Drehportal abstützt und zwei auskragende Tragarme enthält, die sich zu beiden Seiten der Elektrodentragarme bis über den Deckel erstrecken und durch 4 oder manchmal auch 3 Bolzen mit dem Deckel verbunden sind.The lid of an arc furnace must generally be raised and pivoted to the side to charge the furnace. For this purpose, a lid support structure is usually provided, which is supported on a rotating portal supporting the lifting columns of the electrode support arms of the electric arc furnace and contains two projecting support arms which extend to the cover on both sides of the electrode support arms and by 4 or sometimes 3 bolts with the Lid are connected.

Bei einer derartigen Ausbildung des Tragwerkes ist nicht zu vermeiden, daß sich die Deckeltragarme im Bereich der Magnetfelder der Elektroden des Lichtbogenofens befinden. Deshalb müssen diese Tragarme bei Hochleistungslichtbogenöfen wassergekühlt werden, was zu einer erheblichen Erhöhung des Gewichtes des gesamten Tragwerkes beiträgt.With such a design of the supporting structure, it cannot be avoided that the cover support arms are located in the area of the magnetic fields of the electrodes of the arc furnace. For this reason, these support arms have to be water-cooled in high-performance arc furnaces, which contributes to a considerable increase in the weight of the entire structure.

Durch die DE-PS 26 13 012 ist eine Hub- und Schwenkvorrichtung der einleitend genannten Art bekannt geworden, bei der dieses Problem nicht vorhanden ist, da hier das Anheben und Zur-Seite-Schwenken des Ofendeckels mittels einer an der Seitenwand des Ofengefäßes befestigten Halterung erfolgt, die durch Tragglieder fest mit dem Ofenrand verbunden ist und sowohl ein Anheben als auch ein Verschwenken der Tragglieder und damit des Ofendeckels um die senkrechte Mittelachse der Halterung ermöglicht.From DE-PS 26 13 012 a lifting and pivoting device of the type mentioned is known, in which this problem does not exist, since here the lifting and pivoting to the side of the furnace lid by means of a bracket attached to the side wall of the furnace vessel takes place, which is firmly connected to the furnace edge by support members and allows both lifting and pivoting of the support members and thus the furnace cover about the vertical central axis of the holder.

Neuerdings werden die Deckel oder zumindest Teile der Deckel von Lichtbogenöfen als wassergekühlte Elemente ausgebildet und, da diese Elemente elektrisch leitend sind, besteht das Problem einer ausreichenden elektrischen Isolierung des Deckels gegenüber dem Deckeltragwerk, falls dieses während des Ofenbetriebes mit dem Deckel in Verbindung steht. Sollen Elemente des Deckels, wie das besonders beanspruchte Mittelstück, oder der gesamte Deckel ausgewechselt werden, so setzt dies ein Lösen der Hub- und Schwenkvorrichtung bzw. des Deckeltragwerks vom Deckel voraus, was nicht nur zeitaufwendig, sondern für die damit befaßten Arbeiter wegen der hohen Temperaturen in der Nähe des Deckels auch beschwerlich und gefährlich ist.Recently, the lids or at least parts of the lids of arc furnaces have been designed as water-cooled elements and, since these elements are electrically conductive, there is the problem of adequate electrical insulation of the lid from the lid structure, if this is connected to the lid during furnace operation. If elements of the lid, such as the particularly stressed center piece, or the entire lid are to be replaced, this requires the lifting and swiveling device or the lid support to be released from the lid, which is not only time-consuming but also for the workers concerned because of the high level Temperatures near the lid is also arduous and dangerous.

Der Erfindung liegt die Aufgabe zugrunde, bei einer Hub- und Schwenkvorrichtung der im Oberbegriff des Patentanspruchs 1 genannten Art, ohne großen konstruktiven Aufwand, eine gute elektrische Isolierung dieser Vorrichtung gegenüber dem Ofendeckel zu gewährleisten und unerwünschte Kriechströme zwischen dem Deckel und dieser Vorrichtung zu verhindern. Ferner soll das Auswechseln des Deckels oder von Teilen des Deckels vereinfacht und die hierfür erforderliche Zeit verkürzt werden. Der Auswechselvorgang soll durchgeführt werden können, ohne daß sich Arbeiter zur Lösung der Verbindung zwischen der Hub- und Schwenkvorrichtung und dem Deckel in die unmittelbare Nähe des Ofengefäßes begeben müssen.The invention has for its object to ensure good electrical insulation of this device with respect to the furnace cover and to prevent undesirable leakage currents between the cover and this device in a lifting and swiveling device of the type mentioned in the preamble of claim 1 without great design effort. Furthermore, the replacement of the lid or parts of the lid is to be simplified and the time required for this is to be shortened. The exchange process should be able to be carried out without workers having to go into the immediate vicinity of the furnace vessel to solve the connection between the lifting and swiveling device and the lid.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind den übrigen Ansprüche zu entnehmen.The object is achieved by the features of claim 1. Advantageous embodiments of the invention can be found in the remaining claims.

Die Erfindung wird durch drei Ausführungsbeispiele anhand von 6 Figuren näher erläutert. Es zeigen

  • Fig. 1 in schematischer Darstellung eine Seitenansicht eines Lichtbogenofens mit einer Hub- und Schwenk vorrichtung für den Deckel entsprechend der ersten Ausführungsform,
  • Fig. 2 in schematischer Darstellung eine Draufsicht auf diese Anordnung,
  • Fig 3 und 4 entsprechende Ansichten der zweiten Ausführungsform und
  • Fig 5 und 6 entsprechende Ansichten der dritten Ausführungsform.
The invention is explained in more detail by three exemplary embodiments with reference to 6 figures. Show it
  • 1 is a schematic representation of a side view of an arc furnace with a lifting and pivoting device for the lid according to the first embodiment,
  • 2 shows a schematic representation of a top view of this arrangement,
  • 3 and 4 corresponding views of the second embodiment and
  • 5 and 6 corresponding views of the third embodiment.

Der in den Fig. 1 und 2 dargestellte Lichtbogenofen 1 enthält ein Ofengefäß 2 mit wassergekühlten Wänden, wie es beispielsweise in der DE-OS 28 24 821 beschrieben ist. Auf einem oberen wasserführenden Ring 3 dieses Ofengefäßes liegt mit seinem Rand ein Deckel 4 auf, der wie in Fig. 2 angedeutet ist, einen wassergekühlten äußeren Tragring 5 für innerhalb dieses Tragrings angeordnete wassergekühlte Elemente aufweist.The arc furnace 1 shown in FIGS. 1 and 2 contains a furnace vessel 2 with water-cooled walls, as described for example in DE-OS 28 24 821. On an upper water-bearing ring 3 of this furnace vessel, the edge of a lid 4, which, as indicated in FIG. 2, has a water-cooled outer support ring 5 for water-cooled elements arranged within this support ring.

Seitlich des Ofengefäßes befindet sich in bekannter Weise ein Drehportal 6, das um eine senkrechte Schwenkachse 7 schwenkbar ist. Es stützt sich auf Rollen 8 ab und trägt die Hubsäulen 9 für die Elektrodentragarme 10 in die Lichtbogenelektroden 11 (nur in Fig. 2 dargestellt) eingespannt sind, die durch Elektrodendurchführungen im Deckel 4 hindurchgeführt sind.A rotary portal 6, which can be pivoted about a vertical pivot axis 7, is located to the side of the furnace vessel in a known manner. It is supported on rollers 8 and carries the lifting columns 9 for the electrode support arms 10 in which the arc electrodes 11 (only shown in FIG. 2) are clamped, which are passed through electrode bushings in the cover 4.

Als Hub- und Schwenkvorrichtung für den Ofendeckel 4 sind bei dem ersten Ausführungsbeispiel zwei um eine horizontale Schwenkachse 12 schwenkbare Klauen 13 und 14 vorgesehen, die in der in Fig. 1 strich-punktiert dargestellten abgesenkten Position - gekennzeichnet durch 13' - vom Rand des Deckels 4 gelöst sind und beim Anheben jeweils in eine der Form der Schwenkklauen angepaßte Hebeöse 15 bzw. 16 am Rand des Deckels 4 eingreifen. Die Hubbewegung der Schwenkklauen 13 und 14 wird bei dem Ausführungsbeispiel durch hydraulisch betätigte Linearantriebe 17 bewirkt, die drehbar in der betreffenden Schwenkklaue 13 bzw. 14 und auf der Plattform des Portals 6 gelagert sind. Die Antriebe der Schwenkklauen 13 und 14 müssen so ausgebildet sein, daß sie in der Lage sind, nach dem Eingriff der Schwenkklauen in die zugehörigen Hebeösen 15 und 16, den Deckel 4 vom Ofengefäß 2 abzuheben. Die entsprechende Position der Schwenkklaue 13 ist in Fig. 1 ebenfalls strich-punktiert dargestellt und mit 13" bezeichnet.In the first exemplary embodiment, two claws 13 and 14 which can be pivoted about a horizontal pivot axis 12 are provided as the lifting and pivoting device for the furnace cover 4, which in the lowered position shown in dash-dotted lines in FIG. 1 - identified by 13 '- from the edge of the cover 4 are loosened and engage each time in the lifting eye 15 or 16 adapted to the shape of the swivel claws on the edge of the cover 4. The lifting movement of the swiveling claws 13 and 14 is effected in the exemplary embodiment by hydraulically actuated linear drives 17 which are rotatably mounted in the swiveling claw 13 and 14 in question and on the platform of the portal 6. The drives of the swivel claws 13 and 14 must be designed such that they are able to lift the lid 4 from the furnace vessel 2 after the swivel claws have engaged in the associated lifting eyes 15 and 16. The corresponding position of the swivel claw 13 is also shown in dash-dotted lines in FIG. 1 and is designated by 13 ".

Jede Schwenkklaue enthält auf der dem Deckel 4 zugewandten Seite ein unteres Drucklager 18 und auf der dem Deckel abgewandten Seite ein höher liegendes oberes Drucklager 19. Die beiden Drucklager sind aus Gründen der Übersichtlichkeit nur bei der abgesenkten Schwenkklaue 13' markiert. Diese Drucklager liegen bei Eingriff der Schwenkklauen 13 und 14 in die zugehörigen Hebeösen 15 und 16 an angepaßten Gegenlagern 20 bzw. 21 an. Um eine exakte Positionierung der Lager zu ermöglichen, kann man beispielsweise die horizontale Schwenkachse 12 in einer justierbaren Exzenterscheibe (nicht dargestellt) anordnen, oder die Drucklager 18/19 bzw. die zugehörigen Gegenlager 20/21 mit auswechselbaren Distanzplatten (nicht dargestellt) versehen.Each swivel claw contains a lower thrust bearing 18 on the side facing the cover 4 and a higher upper thrust bearing 19 on the side facing away from the cover. For reasons of clarity, the two thrust bearings are only marked when the swivel claw 13 'is lowered. These Thrust bearings are in contact with the pivoting claws 13 and 14 in the associated lifting eyes 15 and 16 on adapted counter bearings 20 and 21 respectively. In order to enable exact positioning of the bearings, one can, for example, arrange the horizontal pivot axis 12 in an adjustable eccentric disk (not shown), or the thrust bearings 18/19 or the associated counter bearings 20/21 can be provided with interchangeable spacer plates (not shown).

Bei einem Anheben des Deckels 4 wirken,verursacht durch das exzentrisch angreifende Deckelgewicht zwischen dem Lager 19 und dem Gegenlager 21, in Richtung einer Lösung des Eingriffs gerichtete Kräfte. Um diese durch Reibungskräfte zu kompensieren werden vorzugsweise das obere Drucklager 19 und das zugehörige Gegenlager 21 als Schrägflächen ausgebildet, die in der durch eine ausgezogene Linie dargestellten Eingriffslage der schwenkbaren Klaue bei auf dem Ofengefäß 2 aufliegendem Deckel 4 unter einem Winkel von 5° bis 20° vorzugsweise von 10° gegenüber einer senkrechten Ebene geneigt sind. Dieser Winkel ist in Fig. 1 angedeutet und mit a bezeichnet.When the cover 4 is lifted, forces caused by the eccentrically acting cover weight between the bearing 19 and the counter-bearing 21 act in the direction of releasing the engagement. In order to compensate for this by frictional forces, the upper thrust bearing 19 and the associated counter bearing 21 are preferably designed as inclined surfaces which, in the engagement position of the pivotable claw shown by a solid line, with the cover 4 resting on the furnace vessel 2 at an angle of 5 ° to 20 ° are preferably inclined by 10 ° with respect to a vertical plane. This angle is indicated in Fig. 1 and designated a.

Eine unerwünschte Horizontalverschiebung des Deckels 4 beim Anheben durch die Schwenkklauen 13 und 14 um den erforderlichen Betrag, kann dadurch vermieden werden, daß die horizontale Schwenkachse 12 in einer Höhe angeordnet wird, die der Höhe zwischen Oberkante und Unterkante des auf dem Ofengefäß 2 aufliegenden Deckels 4 entspricht. Vorzugsweise ist die horizontale Schwenkachse 12 in einer Höhe angeordnet, die der Höhe zwischen Oberkante und Unterkante der in der Fig. nicht dargestellten Elektrodendurchführungen im Deckel 4 entspricht. Liegt die Höhe der Schwenkachse in einer Höhe, die der Mitte zwischen Oberkante und Unterkante der Elektrodendurchführungen im Deckel entspricht, dann ist die Horizontalverschiebung bei den Elektrodendurchführungen beim Anheben des Deckels minimiert.An undesired horizontal displacement of the lid 4 when lifting by the swivel claws 13 and 14 by the required amount can be avoided by arranging the horizontal swivel axis 12 at a height which is the height between the upper edge and lower edge of the lid 4 resting on the furnace vessel 2 corresponds. The horizontal pivot axis 12 is preferably arranged at a height which corresponds to the height between the upper edge and lower edge of the electrode bushings in the cover 4, which are not shown in the figure. If the height of the swivel axis is at a height that corresponds to the center between the upper edge and lower edge of the electrode feedthroughs in the lid, then the horizontal displacement of the electrode feedthroughs when the lid is lifted is minimized.

Die Hebeösen 15 und 16 sind bei dem beschriebenen Ausführungsbeispiel in Tragarmen 22 und 23 vorgesehen, die fest mit dem Deckelring 5 verbunden sind. Außerdem sind die beiden Schwenkklauen 13 und 14 zur Gewährleistung einer synchronen Bewegung durch eine Querwelle 29 miteinander verbunden, die vorzugsweise als Hohlwelle ausgebildet ist.The lifting eyes 15 and 16 are provided in the described embodiment in support arms 22 and 23 which are fixedly connected to the cover ring 5. In addition, the two swiveling claws 13 and 14 are connected to one another to ensure a synchronous movement by a transverse shaft 29, which is preferably designed as a hollow shaft.

Es wird nun die Arbeitsweise der beschriebenen Vorrichtung erläutert.The operation of the device described will now be explained.

Während des Ofenbetriebes liegt der Deckel 4 auf dem Ofengefäß 2 auf und die Schwenkklauen 13 und 14 befinden sich in der unteren strich-punktiert dargestellten Position 13'. Soll der Deckel angehoben und zur Seite geschwenkt werden, dann werden die Linearantriebe 17 der beiden Schwenkklauen 13 und 14 betätigt und diese werden synchron nach oben in die mit ausgezogenen Linien dargestellte Eingriffsposition bewegt. Die Schwenkklauen 13 und 14 greifen in die Hebeösen 15 und 16 ein und bei exakter Justierung der Drucklager 18 und 19 und der zugehörigen Gegenlager 20 und 21 kommen diese gleichzeitig zur gegenseitigen Anlage. Bei einem weiteren Hochschwenken der Schwenkklauen 13 und 14 mittels der Antriebe 17 wird der Deckel 4 um die Schwenkachse 12 bis in die strich-punktiert dargestellte Position angehoben. In dieser Position befinden sich die Schwenkklauen oberhalb des wassergekühlten Ringes 3, d.h. oberhalb des oberen Randes des Ofengefäßes 2 und können zusammen mit dem Deckel ungehindert zur Seite geschwenkt werden. Diese Schwenkbewegung erfolgt durch Drehen des Drehportals 6 um die senkrechte Schwenkachse 7. Hierbei werden gleichzeitig die Elektrodenarme mitgeschwenkt, die zuvor bis in eine Position angehoben wurden, bei der die Schwenkbewegung der Elektroden durch den oberen Gefäßrand nicht behindert wird. Um bei einem Ausfall der Antriebe 17 für die Schwenkklauen 13 und 14 ein unbeabsichtigtes Absenken zu verhindern, ist es zweckmäßig, die Schwenkklauen in der obersten Position mechanisch zu verriegeln.During operation of the furnace, the cover 4 rests on the furnace vessel 2 and the swiveling claws 13 and 14 are in the lower position 13 'shown in dash-dotted lines. If the lid is to be lifted and pivoted to the side, the linear drives 17 of the two pivoting claws 13 and 14 are actuated and these are moved synchronously upwards into the engagement position shown in solid lines. The swiveling claws 13 and 14 engage in the lifting eyes 15 and 16 and when the thrust bearings 18 and 19 and the associated counter bearings 20 and 21 are precisely adjusted, they come into mutual contact at the same time. When the swiveling claws 13 and 14 are swiveled up further by means of the drives 17, the cover 4 is raised about the swiveling axis 12 up to the position shown in broken lines. In this position, the swivel claws are located above the water-cooled ring 3, i.e. above the upper edge of the furnace vessel 2 and can be swung freely to the side together with the lid. This swiveling movement takes place by rotating the rotary portal 6 about the vertical swiveling axis 7. At the same time, the electrode arms are swiveled, which were previously raised to a position in which the swiveling movement of the electrodes is not impeded by the upper edge of the vessel. In order to prevent unintentional lowering in the event of a failure of the drives 17 for the swivel claws 13 and 14, it is expedient to mechanically lock the swivel claws in the uppermost position.

Das seitliche Rückschwenken des Deckels erfolgt durch Zurückdrehen des Drehportals 6 und das Absenken des Deckels 4 auf das Ofengefäß 2 durch Betätigen des Linearantriebes 17 in umgekehrter Richtung nach Beseitigung der mechanischen Verriegelung. Soll der Deckel 4 oder ein Teil des Deckels, wie ein vom äußeren Tragring 5 getragenes Kühlelement ausgewechselt werden, dann werden mittels des Drehportals 6 nach dem Anheben der Elektrodentragarme 10 die Schwenkklauen in der unteren, ausgerückten Position 13" zusammen mit den Elektrodentragarmen zur Seite geschwenkt. Damit wird der auf dem Ofengefäß liegende Deckel 4 von oben zugänglich und es können mit einem Kran Teile hiervon oder der gesamte Deckel abgehoben und durch neue Teile ersetzt werden.The cover is swiveled back laterally by turning back the rotary portal 6 and lowering the cover 4 onto the furnace vessel 2 by actuating the linear drive 17 in the reverse direction after the mechanical locking has been eliminated. If the cover 4 or a part of the cover, such as a cooling element carried by the outer support ring 5, is to be replaced, the pivoting claws are pivoted to the side together with the electrode support arms in the lower, disengaged position 13 ″ after the electrode support arms 10 have been raised by means of the rotary portal 6 The lid 4 lying on the furnace vessel is thus accessible from above and parts thereof or the entire lid can be lifted off and replaced with new parts.

Da sich auch während des Ofenbetriebs die Schwenkklauen 13 und 14 außerhalb des Eingriffs in der unteren Position 13' befinden, besteht zwischen diesen und dem Deckel während dieser Zeit keine elektrische Verbindung, so daß aufwendige Maßnahmen zur Unterbindung von Kriechströmen überflüssig sind.Since the pivoting claws 13 and 14 are also out of engagement in the lower position 13 'during furnace operation, there is no electrical connection between them and the cover during this time, so that expensive measures to prevent leakage currents are superfluous.

Bei dem in den Fig. 3 und 4 dargestellten zweiten Ausführungsbeispiel der Erfindung ist anstelle der beiden Schwenkklauen 13 und 14 ein Hubstempel 24 als heb- und senkbares Tragglied vorgesehen. Die Teile des zweiten Ausführungsbeispiels, die denen des ersten entsprechen, sind mit gleichen Bezugszeichen versehen und es wird auf die zum ersten Ausführungsbeispiel dieser Teile gegebene Edäuterung Bezug genommen.In the second embodiment of the invention shown in FIGS. 3 and 4, a lifting ram 24 is provided as a lifting and lowering support member instead of the two swiveling claws 13 and 14. The parts of the second exemplary embodiment which correspond to those of the first are provided with the same reference numerals and reference is made to the explanation given for the first exemplary embodiment of these parts.

Der Hubstempel 24 ist auf der Plattform des Drehportals 6 befestigt und zwar, wie Fig. 4 erkennen läßt, seitlich der Elektrodentragarme. Beim Drehen des Drehportals 6 um die senkrechte Achse 7 läßt sich der Deckel 4 in die in Fig. 4 strich-punktiert dargestellte Position seitlich verschwenken. Um die bei diesem Schwenkvorgang auftretenden Kräfte über den Hubstempel 24 übertragen zu können, muß dieser sowohl gegenüber dem Drehportal 6 als auch gegenüber dem Deckel 4 gegen Verdrehen gesichert sein. Die Drehsicherung des Hubstempels gegenüber dem Drehportal kann beispielsweise durch eine senkrechte Nut im Drehportal erfolgen, in die ein seitlich am Hubstempel 24 eingesetzter Stift eingreift. Die Drehsicherung des Hubstempels 24 gegenüber dem Deckel 4 erfolgt bei dem Ausführungsbeispiel durch eine Anflachung 25 des Hubstemples, die etwa senkrecht ausgebildet ist und an einer entsprechend ausgebildeten Gegenfläche im Bereich der Hebeöse anliegt. Der Hubstempel 24 kann aus der dargestellten Eingriffsposition in eine den Deckel freigebende Freigabeposition abgesenkt und außerdem aus der dargestellten Position unter Mitnahme des Deckels so weit angehoben werden, daß dieser beim Drehen des Drehportals ungehindert zur Seite geschwenkt werden kann. Die Arbeitsweise des zweiten Ausführungsbei spiels entspricht der des ersten Ausführungsbeispiels. Auf die zu diesem Beispiel gegebene Erläuterung wird Bezug genommen.The lifting ram 24 is fastened on the platform of the rotary portal 6, specifically, as can be seen in FIG. 4, on the side of the electrode support arms. When the rotary portal 6 is rotated about the vertical axis 7, the cover 4 can be pivoted laterally into the position shown in dash-dotted lines in FIG. 4. In order to be able to transmit the forces occurring during this pivoting process via the lifting ram 24, the latter must be secured against rotation both with respect to the rotary portal 6 and with respect to the cover 4. The lifting plunger can be secured against rotation with respect to the rotating portal, for example, by a vertical groove in the rotating portal into which a pin inserted laterally on the lifting plunger 24 engages. The lifting plunger 24 is secured against rotation with respect to the cover 4 in the exemplary embodiment by a flattened portion 25 of the lifting die, which is approximately vertical and rests on a correspondingly designed counter surface in the area of the lifting eye. The lifting ram 24 can be lowered from the engagement position shown into a release position releasing the cover and can also be raised from the position shown while taking the cover with it so that it can be swung freely to the side when the rotary portal is rotated. The operation of the second game Ausführungsbei corresponds to that of the first embodiment. Reference is made to the explanation given for this example.

Das dritte Ausführungsbeispiel gemäß den Fig. 5 und 6 unterscheidet sich vom zweiten Ausführungsbeispiel dadurch, daß statt eines Hubstempels 24 zwei Hubstempel 26 und 27 vorgesehen sind. Damit hier ein seitliches Verschwenken des Deckels 4 in die in Fig. 6 gestrichelt angedeutete ausgeschwenkte Position möglich ist, ohne daß die Schwenkbewegung behindert wird, muß die senkrechte Schwenkachse 7 des Drehportals 6 außerhalb der Symmetrieachse 28 zwischen den beiden Hubstempeln 26 und 27 liegen (siehe Fig. 6). Die Lage bestimmt sich danach, daß der Hubstempel 27 beim Drehen des Drehportals am Ofengefäß vorbeigeführt werden kann.The third exemplary embodiment according to FIGS. 5 and 6 differs from the second exemplary embodiment in that instead of one lifting ram 24 two lifting rams 26 and 27 are provided. So that a lateral pivoting of the cover 4 into the pivoted-out position indicated by the dashed line in FIG. 6 is possible without the pivoting movement being impeded, the vertical pivot axis 7 of the rotary portal 6 must lie outside the axis of symmetry 28 between the two lifting pistons 26 and 27 (see Fig. 6). The position is determined by the fact that the lifting ram 27 can be guided past the furnace vessel when the rotary portal is rotated.

Claims (15)

1. Apparatus for lifting and pivoting the cover (4) of the furnace vessel (2) of an electric arc furnace (1), the apparatus being arranged laterally of the furnace vessel (2) and including a carrier member (13, 14, 24, 26, 27) which can be raised and lowered and which directly engages the edge of the cover, wherein at least one lifting apparatus is fixed on a laterally pivotable rotary portal arrangement (6) arranged beside the furnace vessel and the carrier member (13, 14, 24, 26, 27) is released from the edge of the cover in the lowered position (13') and in the lifting operation engages into a lifting eye (15, 16) which is adapted to the shape of the carrier member, at the edge of the cover.
2. Apparatus according to claim 1 characterised in that, with two lifting apparatuses, the laterally pivotable rotary portal arrangement (6) is pivotable about a vertical pivot axis disposed outside the axis of symmetry (28) between the two carrier members (26, 27).
3. Apparatus according to claim 1 or claim 2 characterised in that on the side towards the cover (4) the carrier member (13, 14, 24, 26, 27) has a lower thrust bearing member (18) while on the side remote from the cover it has an upper thrust bearing member (19) disposed at a higher level, and the two thrust bearing members bear against co-operating bearing members (20, 21) which are matched thereto, when the carrier member engages into the associated lifting eye (15, 16) of the cover (4).
4. Apparatus according to claim 3 characterised in that the upper thrust bearing member (19) and the associated co-operating bearing member (21), in the position of engagement of the carrier member with the cover lying on the furnace vessel, are in the form of inclined surfaces which are inclined at an angle (a) of from 5° to 20° relative to a vertical plane.
5. Apparatus according to one of claims 1 to 4 characterised in that the rotary portal arrangement carries at least one lift column (9) of an electrode carrier arm (10) of the electric arc furnace (1).
6. Apparatus according to one of claims 1 to 5 characterised in that the carrier member which can be raised and lowered is in the form of a claw (13, 14) which is pivotable about a horizontal pivot axis (12).
7. Apparatus according to claim 6 characterised in that the horizontal pivot axis (12) is arranged at a level which corresponds to the level between the upper edge and the lower edge of the cover (4) when lying on the furnace vessel (2).
8. Apparatus according to claim 7 characterised in that the horizontal pivot axis (12) is arranged at a level which corresponds to the level between the upper edge and the lower edge of the member or members in the cover (4), through which the respective electrode passes through the cover.
9. Apparatus according to one of claims 6 to 8 characterised in that the horizontal pivot axis (12) is displaceable in the direction of the cover (4) for horizontal adjustment of engagement of the pivotable claws (13, 14) into the lifting eyes (15, 16) on the cover (4).
10. Apparatus according to claim 9 characterised in that the horizontal pivot axis (12) is arranged in an adjustable eccentric disc.
11. Apparatus according to one of claims 6 to 10 characterised in that two pivotable claws (13, 14) are disposed at a spacing relative to each other, the claws being fixedly connected together for synchronous actuation by a transverse shaft (29).
12. Apparatus according to one of claims 1 to 5 characterised in that the carrier member which can be raised and lowered is in the form of a lift ram (24, 26, 27).
13. Apparatus according to claim 12 characterised in that the lift ram (24) is prevented from rotating relative to the rotary portal arrangement (6) and, upon engagement into the associated lifting eye (15), relative to the cover (4).
14. Apparatus according to one of claims 1 to 13 characterised in that the cover is in the form of a liquid-cooled cover (4).
15. Apparatus according to claim 14 characterised in that the lifting eye is provided in an outer carrier ring (5) of the liquid-cooled cover (4).
EP86105214A 1985-04-19 1986-04-15 Device to raise and pivot the top of an arc furnace Expired EP0203339B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853514293 DE3514293A1 (en) 1985-04-19 1985-04-19 LIFTING AND SWIVELING DEVICE FOR THE LID OF THE OVEN CASE OF AN ARC FURNACE
DE3514293 1985-04-19

Publications (3)

Publication Number Publication Date
EP0203339A2 EP0203339A2 (en) 1986-12-03
EP0203339A3 EP0203339A3 (en) 1987-04-22
EP0203339B1 true EP0203339B1 (en) 1989-09-20

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ID=6268680

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Application Number Title Priority Date Filing Date
EP86105214A Expired EP0203339B1 (en) 1985-04-19 1986-04-15 Device to raise and pivot the top of an arc furnace

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EP (1) EP0203339B1 (en)
DE (2) DE3514293A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008012280A1 (en) * 2008-03-03 2009-09-10 Fuchs Technology Ag Arc furnace
DE102012001907A1 (en) * 2012-02-02 2013-08-08 Badische Stahl-Engineering Gmbh Combined lid lifting and swiveling gear for use in lid handling system of e.g. three-phase alternating current arc furnace, has lid lifting columns comprising receiving recess and support surface for retaining lid

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT387455B (en) * 1987-05-15 1989-01-25 Voest Alpine Ag ELECTRIC OVENS, LIKE ARC OVENS OR PLASMA OVENS
DE3906653A1 (en) 1989-03-02 1990-09-06 Fuchs Technology Ag Melt-down unit with shaft-type charging-material preheater
HU209757B (en) * 1989-03-02 1994-10-28 Fuchs Technology Ag Melting aggregate with an arc furnace
DE3907129A1 (en) * 1989-03-06 1990-09-13 Fuchs Technology Ag ARC FURNACE
AT401304B (en) * 1993-11-04 1996-08-26 Voest Alpine Ind Anlagen LID LIFT FOR A LID TO BE INSTALLED ON A METALLURGICAL VESSEL
DE102006019481B4 (en) * 2006-04-26 2012-04-05 Fridolin Ohnemus Covering device and method for mounting and dismounting the covering device
DE102008028966A1 (en) * 2008-06-18 2009-12-24 Fuchs Technology Holding Ag Rotary portal for a stove
DE102010041694A1 (en) 2010-09-30 2012-04-05 Siemens Aktiengesellschaft Lifting- and pivoting device for cover, comprises guide housing having base plate, liftable and lowerable lifting pin, lifting cylinder for liftable and lowerable lifting pin, and guide frame for supporting cover having support arm
DE102010041692A1 (en) 2010-09-30 2012-04-05 Siemens Aktiengesellschaft Lifting and pivoting device for a lid of a furnace and furnace system and method for charging and maintenance of such a furnace system
EP2685192A1 (en) * 2012-07-11 2014-01-15 Siemens VAI Metals Technologies GmbH Arc furnace
CN112944914A (en) * 2021-02-01 2021-06-11 中国电子科技集团公司第四十八研究所 Vertical oxidation furnace swing furnace door device and vertical oxidation furnace

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539482C (en) * 1931-11-28 Demag Elektrostahl G M B H Oven lid
GB102365A (en) * 1916-06-22 1916-11-30 James Keith Improvements in Lids or Covers for Crucible Furnaces.
US1818239A (en) * 1929-09-25 1931-08-11 Pittsburgh Res Corp Electric furnace
US3979551A (en) * 1975-09-24 1976-09-07 Hawley Manufacturing Corporation Arc furnace fumes control system
DE3120613C2 (en) * 1981-05-23 1983-03-17 Mannesmann AG, 4000 Düsseldorf Lifting device for a cover of an electric arc furnace
AT371921B (en) * 1981-10-09 1983-08-10 Voest Alpine Ag ELECTRIC OVEN

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008012280A1 (en) * 2008-03-03 2009-09-10 Fuchs Technology Ag Arc furnace
DE102012001907A1 (en) * 2012-02-02 2013-08-08 Badische Stahl-Engineering Gmbh Combined lid lifting and swiveling gear for use in lid handling system of e.g. three-phase alternating current arc furnace, has lid lifting columns comprising receiving recess and support surface for retaining lid

Also Published As

Publication number Publication date
DE3514293A1 (en) 1986-10-30
EP0203339A3 (en) 1987-04-22
EP0203339A2 (en) 1986-12-03
DE3665768D1 (en) 1989-10-26

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