EP0077319A1 - Electric furnace - Google Patents

Electric furnace Download PDF

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Publication number
EP0077319A1
EP0077319A1 EP82890136A EP82890136A EP0077319A1 EP 0077319 A1 EP0077319 A1 EP 0077319A1 EP 82890136 A EP82890136 A EP 82890136A EP 82890136 A EP82890136 A EP 82890136A EP 0077319 A1 EP0077319 A1 EP 0077319A1
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EP
European Patent Office
Prior art keywords
lifting
lifting column
furnace
supporting pin
lifting device
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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
EP82890136A
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German (de)
French (fr)
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EP0077319B1 (en
Inventor
Ernst Riegler
Ernst Zajicek
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Primetals Technologies Austria GmbH
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Voestalpine AG
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Publication of EP0077319A1 publication Critical patent/EP0077319A1/en
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Publication of EP0077319B1 publication Critical patent/EP0077319B1/en
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    • 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
    • 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; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • F27B3/16—Walls; Roofs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S254/00—Implements or apparatus for applying pushing or pulling force
    • Y10S254/04—Object engaging heads for jacks

Definitions

  • the invention relates to an electric furnace, such as an arc furnace or a plasma melting furnace, with a lifting mechanism that actuates a furnace cover, which has a fixed supporting pin, a lifting device arranged within the fixed supporting pin, and an axially displaceably guided on the fixed supporting pin by means of an upper and a lower bearing and lifted by means of the lifting device and has lowerable lifting column which can be brought into and out of engagement with the furnace cover.
  • a lifting mechanism that actuates a furnace cover, which has a fixed supporting pin, a lifting device arranged within the fixed supporting pin, and an axially displaceably guided on the fixed supporting pin by means of an upper and a lower bearing and lifted by means of the lifting device and has lowerable lifting column which can be brought into and out of engagement with the furnace cover.
  • the invention aims to avoid these disadvantages and difficulties and has as its object one To create an electric furnace of the type described above, which has a hoist that allows either a low overall height in comparison to the above-described hoist or, compared to this hoist with the same overall height, significantly lower forces in the bearings of the lifting column.
  • the hollow lifting column surrounds the stationary support pin peripherally and that the lifting device, preferably a double-acting hydraulic cylinder, on the one hand articulated with an end plate closing the lifting column at its upper end and on the other hand with a fixed part of the system, such as the Foundation or the fixed support pin, is articulated.
  • the lifting device preferably a double-acting hydraulic cylinder
  • Fig. 1 shows a plasma melting plant in side view
  • Fig. 2 in plan. 3 and 4 show a section through the lid lifting mechanism, etc. once (Fig. 3) in the lowered and once (Fig. 4) in the raised position of the lid.
  • An upper part 1 of a plasma melting furnace in particular a plasma primary melting furnace, is provided with a cover 2, which is supported by a cover supporting structure 3.
  • a flue gas manifold 4 projects from the cover to a suction device, not shown.
  • the lid lifting mechanism 5 and the lid pivoting mechanism 6 are arranged laterally next to the furnace upper part 1.
  • the furnace lower part 7 rests with weighing beams 8 on raceways 9 supported on the foundation 10.
  • the cover lifting mechanism 5 has a rigidly connected to the foundation 10, e.g. screwed hollow support pin 15 which is arranged within a hollow sleeve-shaped lifting column 16. Between the lifting column 16 and the support pin 15, a lifting, lowering and pivoting of the lifting column 16 on the support pin 15 is made possible by bearings 17, 18, which are designed as bearing bushes, advantageously as bronze sliding bearing bushes. The bearing bushes are fastened to the lifting column 16 and slide when the lifting column 16 moves relative to the stationary support pin 15 along slideways 19, 20 provided thereon.
  • the lifting column 16 is closed at its upper end with an end plate 21.
  • This end plate has on the outside a conical load bearing 22, which is in the lowered position of the cover structure 3 and the lifting column 16 at a distance 23 below the cover structure'3, so that on the one hand no vibrations of the cover structure 3 can be transmitted to the cover lifting mechanism 5 during the melting process or, on the other hand, the furnace vessel 1, 7 can be tilted freely into the pouring or deslagging position.
  • the load bearing 22 projects into a corresponding recess 24 in the cover structure 3.
  • An inclined surface 26 provided near the lower end 25 of the lifting column 16 comes into engagement with a corresponding counter-inclined surface 27, which is arranged on a vertical upright 28 of the cover supporting structure 3, during the lifting.
  • the vertical upright 28 seated on the lower furnace part 7 in the lowered position of the cover structure projects with a bolt 29 arranged at its lower end when the cover structure 3 is in the lowered position in a corresponding recess 30 of the lower furnace part 7.
  • the upper (17) of the bearing bushes 17, 18 is in the lowered position of the lifting column 16 at a distance 31 below a radially outwardly projecting annular flange 32 of the support pin 15, which distance corresponds at least to the lifting height of the lifting column 16.
  • the lower bearing bush 18 is arranged at the lower end of the lifting column 16 and is held by an annular flange 34 which projects radially inwards and is provided with a seal 33.
  • the annular space 36 present between the bearing bushes 17, 18, which are spaced as far apart as possible 35, is filled with lubricant, which is constantly changing located in this annulus.
  • This has the advantage that a highly viscous oil can be used, which ensures a correspondingly long service life of the bearing bushes 17, 18.
  • the bearing bushes expediently have conical inlet and outlet surfaces, not shown, which run obliquely to form a lubricating film.
  • a hydraulic cylinder 38 is arranged in the cavity 37 of the support pin 15 and is connected in an articulated manner with its lower end to the foundation 10 and with the upper end of the piston 39 to the end plate 21.
  • the lower end could also be connected in an articulated manner to the flange 40 projecting radially from the stationary support pin 15 if it continues inwards.
  • the hydraulic cylinder 39 is double-acting, so that the lifting column can be lowered with the help of the hydraulic cylinder until the conical load bearing 22 comes out of engagement from the corresponding recess 24 of the cover structure 3.
  • the arrangement of the bearing bushes 17, 18 at the greatest possible distance 35 and as close as possible to the ends of the fixed support pin results in a low overall height for the support pin and thus a relatively low weight and high rigidity of the construction, while the bearing load is still acceptable. Furthermore, it is possible to move very far apart for a given overall height with the bearing bushes 17, 18, taking advantage of the overall height, so that the forces occurring on the bearing bushes 17, 18 caused by the cover 2 with the cover supporting structure 3 can be kept low.
  • the hydraulic cylinder could be replaced by another lifting device, for example a screw spindle, rack, etc., but it is hydraulic cylinder because of the limited space inside the support pin 15 with respect to assembly and repairs of particular advantage.

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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)

Abstract

Bei einem Elektroofen mit einem einen Ofendeckel betätigenden Hubwerk (5), welches einen ortsfesten Stützzapfen (15) und eine innerhalb des ortsfesten Stützzapfens (15) angeordnete Hubeinrichtung (38) aufweist, ist eine am ortsfesten Stützzapfen (15) mittels eines oberen und eines unteren Lagers axial verschiebbar geführte und mittels der Hubeinrichtung (38) heb- und senkbare, mit dem Ofendeckel in und ausser Eingriff bringbare Hubsäule (16) vorgesehen. Um eine niedrige Bauhöhe des Hubwerkes (5) bzw. geringe Kräfte in den Lagern (17, 18) der Hubsäule zu erzielen, umgibt die hohl ausgebildete Hubsäule (16) den ortsfesten Stützzapfen (15) peripher und ist die Hubeinrichtung (38), vorzugsweise ein doppeltwirkender Hydraulikzylinder, einerseits gelenkig mit einer die Hubsäule (16) an ihrem oberen Ende abschliessenden Stirnplatte (21) und andererseits mit einem ortsfesten Teil der Anlage, wie dem Fundament (10) oder dem ortsfesten Stützzapfen (15), gelenkig verbunden.In the case of an electric furnace with a lifting mechanism (5) which actuates a furnace cover and which has a fixed supporting pin (15) and a lifting device (38) arranged inside the fixed supporting pin (15), there is an upper and a lower one on the fixed supporting pin (15) Provided axially displaceably supported and lifting column (16) which can be raised and lowered by means of the lifting device (38) and which can be brought into and out of engagement with the furnace cover. In order to achieve a low overall height of the lifting mechanism (5) or low forces in the bearings (17, 18) of the lifting column, the hollow lifting column (16) surrounds the stationary supporting pin (15) peripherally and is the lifting device (38), preferably a double-acting hydraulic cylinder, on the one hand articulated with an end plate (21) closing the lifting column (16) at its upper end, and on the other hand articulated to a fixed part of the system, such as the foundation (10) or the fixed support pin (15).

Description

Die Erfindung betrifft einen Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen, mit einem einen Ofendeckel betätigenden Hubwerk, welches einen ortsfesten Stützzapfen, eine innerhalb des ortsfesten Stützzapfens angeordnete Hubeinrichtung und eine am ortsfesten Stützzapfen mittels eines oberen und eines unteren Lagers axial verschiebbar geführte und mittels der Hubeinrichtung heb-und senkbare, mit dem Ofendeckel in und außer Eingriff bringbare Hubsäule aufweist.The invention relates to an electric furnace, such as an arc furnace or a plasma melting furnace, with a lifting mechanism that actuates a furnace cover, which has a fixed supporting pin, a lifting device arranged within the fixed supporting pin, and an axially displaceably guided on the fixed supporting pin by means of an upper and a lower bearing and lifted by means of the lifting device and has lowerable lifting column which can be brought into and out of engagement with the furnace cover.

Ein Elektroofen dieser Art ist der Anmelderin intern bekannt. Die Hubeinrichtung ist bei diesem Elektroofen unterhalb der Hubsäule angeordnet. Da die beiden die Hubsäule führenden Lager zur einwandfreien Aufnahme der Deckelkräfte und der durch diese Kräfte bewirkten Momente möglichst weit voneinander entfernt liegen müssen, ergibt sich bei dieser Konstruktion infolge der dadurch bewirkten großen Länge der Hubsäule und der unter dieser angeordneten Hubeinrichtung eine große Bauhöhe.An electric furnace of this type is known internally to the applicant. The lifting device is arranged below the lifting column in this electric furnace. Since the two bearings guiding the lifting column must be as far apart as possible for the perfect absorption of the cover forces and the moments caused by these forces, this construction results in a large overall height due to the large length of the lifting column and the lifting device arranged beneath it.

Durch die große Bauhöhe ist diese Konstruktion außerdem schwer und teuer, und es erfolgt das Decke).schwenken instabil bzw. federnd.Due to the large height, this construction is also heavy and expensive, and the ceiling is made.) Swivel unstable or springy.

Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und stellt sich die Aufgabe, einen Elektroofen der eingangs beschriebenen Art zu schaffen, welcher ein Hubwerk aufweist, das entweder eine im Vergleich zum oben beschriebenen Hubwerk niedrige Bauhöhe oder im Vergleich zu diesem Hubwerk bei gleicher Bauhöhe wesentlich geringere Kräfte in den Lagern der Hubsäule ermöglicht.The invention aims to avoid these disadvantages and difficulties and has as its object one To create an electric furnace of the type described above, which has a hoist that allows either a low overall height in comparison to the above-described hoist or, compared to this hoist with the same overall height, significantly lower forces in the bearings of the lifting column.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die hohl ausgebildete Hubsäule den ortsfesten Stützzapfen peripher umgibt und daß die Hubeinrichtung, vorzugsweise ein doppeltwirkender Hydraulikzylinder, einerseits gelenkig mit einer die Hubsäule an ihrem oberen Ende abschließenden Stirnplatte und andererseits mit einem ortsfesten Teil der Anlage, wie dem Fundament oder dem ortsfesten Stützzapfen, gelenkig verbunden ist.This object is achieved in that the hollow lifting column surrounds the stationary support pin peripherally and that the lifting device, preferably a double-acting hydraulic cylinder, on the one hand articulated with an end plate closing the lifting column at its upper end and on the other hand with a fixed part of the system, such as the Foundation or the fixed support pin, is articulated.

Es ist bereits vorgeschlagen worden (österreichische Patentanmeldung A 30/81), bei einer Hubeinrichtung für den Deckel eines Elektroofens, bei der die Hubsäule den ortsfesten Stützzapfen peripher umgibt, den Raum zwischen einer die Hubsäule am oberen Ende abschließenden Stirnplatte und dem ortsfesten Stützzapfen als von einem hydraulischen Medium beaufschlagbaren, in Hubrichtung wirkenden Zylinderraum auszubilden. Dies ist für kleinere Elektroöfen wegen der Einfachheit der Konstruktion von besonderem Vorteil. Bei größeren Elektroöfen (ab etwa 40 t Flüssigbad), d.h. bei Elektroöfen mit sehr schweren Deckeln, ergibt sich ein großer Innendurchmesser der Hubsäule, woraus ein relativ großer Zylinderraum resultiert, der große ölmengen zum Bewegen der Hubsäule bzw. des Deckels erforderlich macht. Da die Deckelhub-und Deckelsenkzeit ein bestimmtes Ausmaß nicht überschreiten soll, können die erforderlichen großen ölmengen nur mehr mit Schwierigkeiten in der zum Heben des Deckels zur Verfügung stehenden Zeit in den Zylinderraum gefördert werden. Bei der erfindungsgemäßen Konstruktion tritt dieses Problem nicht auf, da ein Hydraulikzylinder mit kleinem Zylinderraum verwendet werden kann.It has already been proposed (Austrian patent application A 30/81), in a lifting device for the lid of an electric furnace, in which the lifting column surrounds the stationary supporting pin peripherally, the space between an end plate closing the lifting column at the upper end and the stationary supporting pin as from to form a hydraulic medium which can be acted upon and which acts in the stroke direction. This is particularly advantageous for smaller electric ovens because of the simplicity of the construction. With larger electric furnaces (from about 40 t liquid bath), ie with electric furnaces with very heavy lids, there is a large inner diameter of the lifting column, which results in a relatively large cylinder space, which requires large amounts of oil to move the lifting column or the lid. Since the lid lifting and lid lowering time should not exceed a certain extent, the large amounts of oil required can only be pumped into the cylinder space with difficulty in the time available for lifting the lid. In the construction according to the invention occurs this problem does not arise because a hydraulic cylinder with a small cylinder space can be used.

Die Erfindung ist nachfolgend anhand der Zeichnung näher erläutert, wobei Fig. 1 eine Plasmaschmelzanlage in Seitenansicht und Fig. 2 im Grundriß zeigen. Die Fig. 3 und 4 zeigen einen Schnitt durch das Deckelhubwerk, u.zw. einmal (Fig. 3) in gesenkter und einmal (Fig. 4) in angehobener Stellung des Deckels.The invention is explained in more detail below with reference to the drawing, in which Fig. 1 shows a plasma melting plant in side view and Fig. 2 in plan. 3 and 4 show a section through the lid lifting mechanism, etc. once (Fig. 3) in the lowered and once (Fig. 4) in the raised position of the lid.

Ein Ofenoberteil 1 eines Plasmaschmelzofens, insbesondere eines Plasmaprimärschmelzofens, ist mit einem Deckel 2, der von einem Deckeltragwerk 3 getragen ist, versehen. Von dem Deckel aus ragt ein Rauchgaskrümmer 4 zu einer nicht dargestellten Absaugung. Seitlich neben dem Ofenoberteil 1 ist das Deckelhubwerk 5 und das Deckelschwenkwerk 6 angeordnet. Der Ofenunterteil 7 ruht mit Wiegebalken 8 auf am Fundament 10 abgestützten Laufbahnen 9.An upper part 1 of a plasma melting furnace, in particular a plasma primary melting furnace, is provided with a cover 2, which is supported by a cover supporting structure 3. A flue gas manifold 4 projects from the cover to a suction device, not shown. The lid lifting mechanism 5 and the lid pivoting mechanism 6 are arranged laterally next to the furnace upper part 1. The furnace lower part 7 rests with weighing beams 8 on raceways 9 supported on the foundation 10.

Aus dem Grundriß ist erkennbar, daß es sich um einen sehr großen Ofen mit vier Plasmabrennern 11 handelt. Jeder der vier Plasmabrenner 11 ist auf einem Schrägbrennermechanismus 12 verfahrbar gelagert. Die Schlackentüre ist mit 13 und die Abgießschnauze mit 14 bezeichnet.From the plan it can be seen that it is a very large furnace with four plasma torches 11. Each of the four plasma torches 11 is movably supported on an inclined torch mechanism 12. The slag door is designated 13 and the pouring spout 14.

Das Deckelhubwerk 5 weist einen mit dem Fundament 10 starr verbundenen, z.B. verschraubten hohlen Stützzapfen 15 auf, der innerhalb einer hohlen hülsenförmigen Hubsäule 16 angeordnet ist. Zwischen der Hubsäule 16 und dem Stützzapfen 15 sind ein Heben, Senken und Schwenken der Hubsäule 16 am Stützzapfen 15 ermöglichende Lager 17, 18 vorgesehen, die als Lagerbüchsen,, vorteilhaft als Bronzegleitlagerbüchsen, ausgebildet sind. Die Lagerbüchsen sind an der Hubsäule 16 befestigt und gleiten bei Bewegen der Hubsäule 16 gegenüber dem ortsfesten Stützzapfen 15 entlang an diesem vorgesehenen Gleitbahnen 19, 20.The cover lifting mechanism 5 has a rigidly connected to the foundation 10, e.g. screwed hollow support pin 15 which is arranged within a hollow sleeve-shaped lifting column 16. Between the lifting column 16 and the support pin 15, a lifting, lowering and pivoting of the lifting column 16 on the support pin 15 is made possible by bearings 17, 18, which are designed as bearing bushes, advantageously as bronze sliding bearing bushes. The bearing bushes are fastened to the lifting column 16 and slide when the lifting column 16 moves relative to the stationary support pin 15 along slideways 19, 20 provided thereon.

Die Hubsäule 16 ist an ihrem oberen Ende mit einer Stirnplatte 21 verschlossen. Diese Stirnplatte weist außenseitig ein kegelförmiges Lastauflager 22 auf, welches sich bei gesenkter Stellung des Deckeltragwerkes 3 und der Hubsäule 16 im Abstand 23 unterhalb des Deckeltragwerkes'3 befindet, so daß einerseits während des Schmelzvorganges keine Schwingungen des Deckeltragwerkes 3 auf das Deckelhubwerk 5 übertragen werden können bzw. anderseits das Ofengefäß 1, 7 ungehindert in die Abgieß- oder Abschlackstellung gekippt werden kann. In angehobener Stellung der Hubsäule 16 und damit des Deckeltragwerkes 3 ragt das Lastauflager 22 in eine korrespondierende Ausnehmung 24 des Deckeltragwerkes 3.The lifting column 16 is closed at its upper end with an end plate 21. This end plate has on the outside a conical load bearing 22, which is in the lowered position of the cover structure 3 and the lifting column 16 at a distance 23 below the cover structure'3, so that on the one hand no vibrations of the cover structure 3 can be transmitted to the cover lifting mechanism 5 during the melting process or, on the other hand, the furnace vessel 1, 7 can be tilted freely into the pouring or deslagging position. In the raised position of the lifting column 16 and thus of the cover structure 3, the load bearing 22 projects into a corresponding recess 24 in the cover structure 3.

Eine nahe dem unteren Ende 25 der Hubsäule 16 vorgesehene Schrägfläche 26 kommt während des Anhebens mit einer korrespondierenden Gegenschrägfläche 27, die an einem Vertikalsteher 28 des Deckeltragwerkes 3 angeordnet ist, in Eingriff. Der in abgesenkter Stellung des Deckeltragwerkes am Ofenunterteil 7 aufsitzende Vertikalsteher 28 ragt mit einem an seinem unteren Ende angeordneten Bolzen 29 bei abgesenkter Stellung des Deckeltragwerkes 3 in eine entsprechende Ausnehmung 30 des Ofenunterteiles 7.An inclined surface 26 provided near the lower end 25 of the lifting column 16 comes into engagement with a corresponding counter-inclined surface 27, which is arranged on a vertical upright 28 of the cover supporting structure 3, during the lifting. The vertical upright 28 seated on the lower furnace part 7 in the lowered position of the cover structure projects with a bolt 29 arranged at its lower end when the cover structure 3 is in the lowered position in a corresponding recess 30 of the lower furnace part 7.

Die obere (17) der Lagerbüchsen 17, 18 befindet sich in abgesenkter Stellung der Hubsäule 16 im Abstand 31 unterhalb eines radial nach außen abstehenden Ringflansches 32 des Stützzapfens 15, welcher Abstand mindestens der Hubhöhe der Hubsäule 16 entspricht. Die untere Lagerbüchse 18 ist am unteren Ende der Hubsäule 16 angeordnet und wird durch einen radial nach innen vorstehenden, mit einer-Dichtung 33 versehenen Ringflansch 34 gehaltert.The upper (17) of the bearing bushes 17, 18 is in the lowered position of the lifting column 16 at a distance 31 below a radially outwardly projecting annular flange 32 of the support pin 15, which distance corresponds at least to the lifting height of the lifting column 16. The lower bearing bush 18 is arranged at the lower end of the lifting column 16 and is held by an annular flange 34 which projects radially inwards and is provided with a seal 33.

Der zwischen den in möglichst großem Abstand 35 voneinander angeordneten Lagerbüchsen 17, 18 vorhandene Ringraum 36 ist mit.Schmiermittel gefüllt, welches sich ständig in diesem Ringraum befindet. Dies hat den Vorteil, daß ein hochviskoses öl eingesetzt werden kann, welches eine entsprechend hohe Standzeit der Lagerbüchsen 17, 18 sicherstellt. Die Lagerbüchsen weisen zweckmäßig nicht dargestellte, zur Bildung eines Schmierfilms schräg verlaufende, kegelförmige Ein- bzw. Auslaufflächen auf.The annular space 36 present between the bearing bushes 17, 18, which are spaced as far apart as possible 35, is filled with lubricant, which is constantly changing located in this annulus. This has the advantage that a highly viscous oil can be used, which ensures a correspondingly long service life of the bearing bushes 17, 18. The bearing bushes expediently have conical inlet and outlet surfaces, not shown, which run obliquely to form a lubricating film.

Im Hohlraum 37 des Stützzapfens 15 ist ein Hydraulikzylinder 38 angeordnet, der mit seinem unteren Ende mit dem Fundament 10 und mit dem oberen Ende des Kolbens 39 mit der Stirnplatte 21 gelenkig verbunden ist. Das untere Ende könnte auch mit dem radial vom ortsfesten Stützzapfen 15 abstehenden Flansch 40, wenn sich dieser nach innen fortsetzt, gelenkig verbunden sein.A hydraulic cylinder 38 is arranged in the cavity 37 of the support pin 15 and is connected in an articulated manner with its lower end to the foundation 10 and with the upper end of the piston 39 to the end plate 21. The lower end could also be connected in an articulated manner to the flange 40 projecting radially from the stationary support pin 15 if it continues inwards.

Der Hydraulikzylinder 39 ist doppeltwirkend, so daß die Hubsäule mit Hilfe des Hydraulikzylinders gesenkt werden kann, bis das kegelige Lastauflager 22 aus der korrespondierenden Ausnehmung 24 des Deckeltragwerkes 3 außer Eingriff kommt.The hydraulic cylinder 39 is double-acting, so that the lifting column can be lowered with the help of the hydraulic cylinder until the conical load bearing 22 comes out of engagement from the corresponding recess 24 of the cover structure 3.

Durch die Anordnung der Lagerbüchsen 17, 18 in möglichst großem Abstand 35 und möglichst nahe der Enden des ortsfesten Stützzapfens ergibt sich bei noch vertretbarer Lagerbelastung eine geringe Bauhöhe für den Stützzapfen und damit ein relativ geringes Gewicht und eine hohe Steifigkeit der Konstruktion. Weiters ist es möglich, bei einer vorgegebenen Bauhöhe mit den Lagerbüchsen 17, 18 unter Ausnützung der Bauhöhe sehr weit auseinanderzurücken, so daß die an den Lagerbüchsen 17, 18 auftretenden, vom Deckel 2 mit dem Deckeltragwerk 3 verursachten Kräfte gering gehalten werden können.The arrangement of the bearing bushes 17, 18 at the greatest possible distance 35 and as close as possible to the ends of the fixed support pin results in a low overall height for the support pin and thus a relatively low weight and high rigidity of the construction, while the bearing load is still acceptable. Furthermore, it is possible to move very far apart for a given overall height with the bearing bushes 17, 18, taking advantage of the overall height, so that the forces occurring on the bearing bushes 17, 18 caused by the cover 2 with the cover supporting structure 3 can be kept low.

Der Hydraulikzylinder könnte durch eine andere Hubeinrichtung, beispielsweise eine Schraubspindel, Zahnstange etc. ersetzt werden, jedoch ist ein Hydraulikzylinder wegen der im Inneren des Stützzapfens 15 beengten Platzverhältnisse in bezug auf die Montage und Reparaturen von besonderem Vorteil.The hydraulic cylinder could be replaced by another lifting device, for example a screw spindle, rack, etc., but it is hydraulic cylinder because of the limited space inside the support pin 15 with respect to assembly and repairs of particular advantage.

Claims (1)

Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen, mit einem einen Ofendeckel (2) betätigenden Hubwerk (5), welches einen ortsfesten Stützzapfen (15), eine innerhalb des ortsfesten Stützzapfens (15) angeordnete Hubeinrichtung (38) und eine am ortsfesten Stützzapfen (15) mittels eines oberen und eines unteren Lagers (17, 18) axial verschiebbar geführte und mittels der Hubeinrichtung (38) heb- und senkbare, mit dem Ofendeckel (2) in und außer Eingriff bringbare Hubsäule (16) aufweist, dadurch gekennzeichnet, daß die hohl ausgebildete Hubsäule (16) den ortsfesten Stützzapfen (15) peripher umgibt und daß die Hubeinrichtung (38), vorzugsweise ein doppeltwirkender Hydraulikzylinder, einerseits gelenkig mit einer die Hubsäule (16) an ihrem oberen Ende abschließenden Stirnplatte (21) und andererseits mit einem ortsfesten Teil der Anlage, wie dem Fundament (10) oder dem ortsfesten Stützzapfen (15), gelenkig verbunden ist.Electric furnace, such as an arc furnace or plasma melting furnace, with a lifting mechanism (5) which actuates an furnace cover (2) and which comprises a fixed supporting pin (15), a lifting device (38) arranged within the fixed supporting pin (15) and a fixed supporting pin (15) an upper and a lower bearing (17, 18) axially displaceably guided and by means of the lifting device (38) liftable and lowerable, with the furnace cover (2) in and out of engagement lifting column (16), characterized in that the hollow Lifting column (16) surrounds the stationary support pin (15) peripherally and that the lifting device (38), preferably a double-acting hydraulic cylinder, is articulated on the one hand with an end plate (21) closing the lifting column (16) at its upper end and on the other hand with a stationary part of the System, such as the foundation (10) or the fixed support pin (15), is articulated.
EP82890136A 1981-10-09 1982-09-27 Electric furnace Expired EP0077319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT4348/81 1981-10-09
AT0434881A AT371921B (en) 1981-10-09 1981-10-09 ELECTRIC OVEN

Publications (2)

Publication Number Publication Date
EP0077319A1 true EP0077319A1 (en) 1983-04-20
EP0077319B1 EP0077319B1 (en) 1985-12-27

Family

ID=3562841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82890136A Expired EP0077319B1 (en) 1981-10-09 1982-09-27 Electric furnace

Country Status (7)

Country Link
US (1) US4437187A (en)
EP (1) EP0077319B1 (en)
JP (1) JPS5872875A (en)
AT (1) AT371921B (en)
BR (1) BR8205900A (en)
CA (1) CA1193304A (en)
DE (1) DE3268166D1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514293A1 (en) * 1985-04-19 1986-10-30 Fuchs Systemtechnik GmbH, 7601 Willstätt LIFTING AND SWIVELING DEVICE FOR THE LID OF THE OVEN CASE OF AN ARC FURNACE
WO1993010413A1 (en) * 1991-11-19 1993-05-27 Fuchs Technology Ag Melt-in aggregate with furnace cradle
WO2009153026A1 (en) 2008-06-18 2009-12-23 Fuchs Technology Holding Ag Pivot portal for a furnace
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
US10211811B2 (en) 2016-05-12 2019-02-19 Huawei Technologies Co., Ltd. Tunable filter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61153375A (en) * 1984-12-26 1986-07-12 新日本製鐵株式会社 Method of operating hydraulic drive for arc furnace
AT387350B (en) * 1987-05-15 1989-01-10 Voest Alpine Ag ELECTRIC OVENS, LIKE ARC OVENS OR PLASMA OVENS
EP2685192A1 (en) * 2012-07-11 2014-01-15 Siemens VAI Metals Technologies GmbH Arc furnace

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1290741A (en) * 1961-06-02 1962-04-13 Cie Constr Gros Mat Electromec Balancing device for the electrode holder system of electrically regulated arc furnaces
DE1508471A1 (en) * 1966-12-28 1970-01-15 Demag Elektrometallurgie Gmbh Automatic locking
GB2033863A (en) * 1978-10-04 1980-05-29 Bbc Brown Boveri & Cie Lifting and swivelling device for the cover of a furnace

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT370871B (en) * 1981-01-08 1983-05-10 Voest Alpine Ag ELECTRIC OVENS, LIKE ARC OR PLASMA MELTING OVENS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1290741A (en) * 1961-06-02 1962-04-13 Cie Constr Gros Mat Electromec Balancing device for the electrode holder system of electrically regulated arc furnaces
DE1508471A1 (en) * 1966-12-28 1970-01-15 Demag Elektrometallurgie Gmbh Automatic locking
GB2033863A (en) * 1978-10-04 1980-05-29 Bbc Brown Boveri & Cie Lifting and swivelling device for the cover of a furnace

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514293A1 (en) * 1985-04-19 1986-10-30 Fuchs Systemtechnik GmbH, 7601 Willstätt LIFTING AND SWIVELING DEVICE FOR THE LID OF THE OVEN CASE OF AN ARC FURNACE
WO1993010413A1 (en) * 1991-11-19 1993-05-27 Fuchs Technology Ag Melt-in aggregate with furnace cradle
US5393037A (en) * 1991-11-19 1995-02-28 Fuchs Technology Ag Smelting unit with furnace rocking cradle
WO2009153026A1 (en) 2008-06-18 2009-12-23 Fuchs Technology Holding Ag Pivot portal for a furnace
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
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
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
US10211811B2 (en) 2016-05-12 2019-02-19 Huawei Technologies Co., Ltd. Tunable filter

Also Published As

Publication number Publication date
CA1193304A (en) 1985-09-10
JPS6327634B2 (en) 1988-06-03
DE3268166D1 (en) 1986-02-06
EP0077319B1 (en) 1985-12-27
US4437187A (en) 1984-03-13
BR8205900A (en) 1983-09-06
ATA434881A (en) 1982-12-15
JPS5872875A (en) 1983-04-30
AT371921B (en) 1983-08-10

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