EP0056224B1 - Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen - Google Patents

Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen Download PDF

Info

Publication number
EP0056224B1
EP0056224B1 EP81890210A EP81890210A EP0056224B1 EP 0056224 B1 EP0056224 B1 EP 0056224B1 EP 81890210 A EP81890210 A EP 81890210A EP 81890210 A EP81890210 A EP 81890210A EP 0056224 B1 EP0056224 B1 EP 0056224B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
annular space
furnace
electric furnace
acting
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
EP81890210A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0056224A1 (de
Inventor
Ernst Riegler
Ernst Zajicek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Voestalpine AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0056224A1 publication Critical patent/EP0056224A1/de
Application granted granted Critical
Publication of EP0056224B1 publication Critical patent/EP0056224B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • 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
    • 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

Definitions

  • the invention relates to an electric furnace, such as an arc furnace or plasma melting furnace, with a lifting mechanism which actuates the furnace cover and which has a king pin supported on the foundation and a sleeve surrounding the king pin, which can be raised and lowered with respect to it and has a bottom at its upper end, which sleeve can be lifted hydraulically and can be brought into engagement with a lid supporting structure that supports the furnace lid.
  • a lifting mechanism which actuates the furnace cover and which has a king pin supported on the foundation and a sleeve surrounding the king pin, which can be raised and lowered with respect to it and has a bottom at its upper end, which sleeve can be lifted hydraulically and can be brought into engagement with a lid supporting structure that supports the furnace lid.
  • a hydraulic cylinder-piston unit is installed between an end-side recess of the kingpin and the bottom of the sleeve, which acts only in the lifting direction.
  • Spherical bearings are installed between the king pin and the sleeve, which are attached to the sleeve and are moved with the sleeve.
  • the recess provided in the kingpin for the cylinder-piston unit requires a larger diameter of the kingpin and thus the sleeve, as a result of which the known construction is very heavy.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide an electric furnace of the type described above, the lifting mechanism of which is lighter in weight than the known construction and in which there are no constraining forces which restrict the functionality of the construction. Furthermore, it should be possible to provide effective, structurally simple lubrication for the bearings or guides arranged between the kingpin and the sleeve. In order to achieve a safe detachment of the sleeve from the lid support structure, the lifting mechanism of the electric furnace should also be able to be operated in the lowering direction if necessary.
  • This object is achieved in that between an end face of the kingpin and the bottom of the sleeve a hydraulic medium that acts in the stroke direction and if necessary between a collar of the kingpin and the inner wall of the sleeve an hydraulic medium that acts in the lowering direction are provided.
  • bearing bushes are arranged at a distance between the king pin and the sleeve on the king pin.
  • a further annular space is provided between an upper and a lower bearing bush, which is connected to the cylinder space by a bore in the kingpin.
  • the annular space acting in the lowering direction is advantageously formed below the lower bearing bush.
  • bearing bushes are fastened at a distance from one another on the inner wall of the sleeve and are movable therewith, expediently the annular space acting in the lowering direction is formed between an upper bearing bush and a collar of the king pin arranged above this bearing bush.
  • a further annular space is advantageously provided between the upper and lower bearing bushes, which is connected to the annular space acting in the lowering direction by one or more channels penetrating the upper bearing bushing is.
  • a control valve hydraulically connecting or separating the cylinder chamber with the annular chamber acting in the lowering direction is expediently provided.
  • 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 support structure 3.
  • a flue gas manifold 4 protrudes 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 lower furnace part 7 rests with weighing beams 8 on raceways 9 supported on the foundation 10.
  • Each of the three plasma torches 11 is on an incline burner mechanism 12 movably mounted.
  • the slag door is designated 13 and the pouring spout 14.
  • the lid lifting mechanism 5 has a rigidly connected to the foundation 10, for. B. screwed, king pin 15 and a surrounding the king pin, relative to this raised and lowered sleeve 16.
  • the sleeve 16 is closed at its upper end with a bottom 17.
  • This bottom 17 has on the outside a conical load bearing 18, which is in the lowered position of the cover structure 3 and the sleeve 16 at a distance 19 below the cover structure 3, so that on the one hand during the melting process no vibrations of the cover structure 3 can be transmitted to the cover lifting mechanism or on the other hand, the furnace vessel 1, 7 can be tilted freely into the pouring or deslagging position.
  • the load bearing 18 projects into a corresponding recess 20 of the cover structure.
  • An inclined surface 21 provided near the lower end of the sleeve 16 comes into engagement with a corresponding counter-inclined surface 22, which is arranged on a vertical upright 23 of the cover supporting structure 3, during the lifting.
  • the inclined surface 21 has an extension 24 which, when the sleeve 16 is raised, engages in a corresponding groove in the counter-inclined surface 22 for the purpose of securing the position.
  • the vertical upright 23 seated on the lower furnace part 7 in the lowered position of the cover structure projects with a bolt 25 arranged at its lower end when the cover structure 3 is in a lowered position in a corresponding recess in the lower furnace part 7.
  • two bearing bushes 27, 28, advantageously bronze bushings are provided which are fastened to the king pin 15 and are spaced 26 apart.
  • the lower (27) of the two bearing bushes is supported on a collar 30 of the kingpin by a seal 29 inserted in a housing.
  • the upper (28) of the two bearing bushes is arranged at the upper end of the kingpin and is fastened to it by means of a cover plate 32 which forms an end face 31 of the kingpin 15.
  • a spacer sleeve 33 is provided between the two bearing bushes 27, 28, but does not completely fill the space between the bearing journal 27, 28 between the king pin 15 and the sleeve 16, but leaves a narrow annular space 34 free.
  • the lower end of the sleeve 16 surrounds the collar 30 of the kingpin 15 with an inwardly projecting flange 35 which is sealed against the column part located below the collar of the kingpin by means of an annular seal 36.
  • the annular space 37 thus formed by the collar 30, the inner wall of the sleeve 16, the flange 35 and the outer surface of the kingpin 15 acts in the lowering direction when hydraulic medium is applied.
  • the maximum height 38 of the lower annular space (it is reached when the sleeve 16 is lowered) corresponds to the required cover stroke.
  • the hydraulic medium passes from a pump 39 via a four-way valve 40 via a hydraulic line 41 to a bore 42 in the sleeve 16, and from there into the annular space 34 provided between the sleeve and the kingpin. From this, the medium flows through a spacer sleeve 33 provided bore 43 to a further bore 44, which extends through the kingpin 15 to its end face 31 in the existing between the end face 31 and the bottom 17 of the sleeve cylinder space 45.
  • the hydraulic medium lifts the cover structure 3.
  • the position of the four-way valve 40 required for the lifting is shown in FIG.
  • Fig. 3 the position of the four-way valve 40 is illustrated when lowering.
  • the hydraulic medium passes via a hydraulic line 46 into the lower annular space 37 provided between the collar 30 of the kingpin 15 and the flange 35 of the sleeve 16, where it acts in the lowering direction of the sleeve 16.
  • the lowering process can proceed without loading this lower annular space 37, u. between at least until the cover structure 3 sits on the lower furnace part 7 with its vertical upright. If the tapered load bearing 18 jams in the recess 20 of the cover structure 3 corresponding to it and the dead weight of the sleeve 16 is not sufficient to release this jamming, the lower annular space 37 is acted upon and the sleeve 16 is further pressed using the hydraulic medium lowered.
  • the supply of the hydraulic medium in the annular space 34 located between the slide bearing bushes 27, 28 during the lifting and pivoting process has the advantage that the hydraulic medium lubricates the sliding bearing bushes well during the lifting and pivoting process.
  • the center line 48 of the inclined surface 21 is in the lowered position of the sleeve 16 at half the lifting height 38 below the center line 47 of the lower slide bearing bushing 27, so that the counter-inclined surface 22 on the inclined surface 21 with the cover structure 3 raised is at a height which is half the lifting height 38 corresponds, supported above the lower slide bearing bush 27 (measured on the center lines 47, 48, 49 of the inclined or counter-inclined surface 21, 22 and slide bearing bush 27).
  • the slide bearing bushes 50, 51 are fastened to the inner wall 52 of the sleeve 53, the lower slide bearing bushing 50 extending over a in a housing inserted seal 54 on an annular flange 35 forming the lower end of the sleeve.
  • the upper plain bearing bush 51 is - with the sleeve 53 lowered - at a distance which corresponds to the required lifting height 38 of the sleeve, below the upper end of the kingpin 55. It is secured by means of a bush 56 against displacement in the longitudinal direction.
  • the kingpin 55 has at its upper end a plate 57 which forms the end face 31 and which projects with an annular collar 58 beyond the circumferential surface of the kingpin to the inside of the sleeve 56. This collar is sealed against the inner wall of the sleeve 56 with a seal 59.
  • a bore 60 extends from the lower end of the kingpin 55 to its end face 31, through which the hydraulic medium intended for lifting is introduced into the cylinder space 45.
  • the upper plain bearing bush 51 is provided with channels designed as bores 61, through which hydraulic medium passes from the annular space 34 into an annular space 37 located above this plain bearing bush. This upper annular space serves to lower the sleeve.
  • hydraulic medium is also supplied via a control valve 62 connecting or separating the two hydraulic lines 41, 46 depending on the position, in the annular space 37 acting in the lowering direction, in order to ensure the lubrication of the two slide bearing bushes 50, 51 during the lifting.
  • the particular advantage of this embodiment can be seen in the fact that the bearing bushes 50, 51 are always flooded and are therefore excellently lubricated.
  • the lower plain bearing bush is located with its center line 47 at a distance below the center line 49 of the counter bevel surface 22 (with the sleeve lowered), as a result of which the center lines of the counter bevel surface 22 and the plain bearing bush 50 coincide with the cover structure 3 raised, which is a particularly favorable way of introducing force via the bush 53 into the Kingpin 55 results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Actuator (AREA)
  • Support Of The Bearing (AREA)
EP81890210A 1981-01-08 1981-12-23 Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen Expired EP0056224B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT30/81 1981-01-08
AT0003081A AT370871B (de) 1981-01-08 1981-01-08 Elektroofen, wie lichtbogenofen oder plasmaschmelzofen

Publications (2)

Publication Number Publication Date
EP0056224A1 EP0056224A1 (de) 1982-07-21
EP0056224B1 true EP0056224B1 (de) 1984-05-16

Family

ID=3479661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890210A Expired EP0056224B1 (de) 1981-01-08 1981-12-23 Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen

Country Status (5)

Country Link
US (1) US4423515A (ja)
EP (1) EP0056224B1 (ja)
JP (2) JPS57142475A (ja)
AT (1) AT370871B (ja)
DE (1) DE3163688D1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT371921B (de) * 1981-10-09 1983-08-10 Voest Alpine Ag Elektroofen
SE431604B (sv) * 1982-06-29 1984-02-13 Asea Ab Anordning for positionering av elektroder vid ljusbagsugnar
US5429341A (en) * 1991-04-17 1995-07-04 Miskolci Egyetem Apparatus and capsule for carrying out processes of directed crystallization, especially in cosmic space conditions
US5445060A (en) * 1994-09-02 1995-08-29 Randall Manufacturing Co., Inc. Floating fluid actuated cylinder
DE102008028966A1 (de) 2008-06-18 2009-12-24 Fuchs Technology Holding Ag Drehportal für einen Ofen
DE102010041692A1 (de) * 2010-09-30 2012-04-05 Siemens Aktiengesellschaft Hub- und Schwenkvorrichtung für einen Deckel eines Ofens sowie Ofenanlage und Verfahren zum Chargieren und zur Wartung einer solchen Ofenanlage
EP2703528A1 (en) 2012-08-31 2014-03-05 baumhueter extrusion GmbH Cross-linked polyethylene fibre, its use and process for its manufacture

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1818239A (en) * 1929-09-25 1931-08-11 Pittsburgh Res Corp Electric furnace
US2469740A (en) * 1946-01-31 1949-05-10 Deiaware Engineering Corp Arc furnace with lift and swing aside roof
DE835443C (de) * 1949-10-01 1952-03-31 Demag Elektrostahl G M B H Elektroschmelzofen mit Hubwerk zum Abnehmen des Deckels
FR1189359A (fr) * 1957-01-26 1959-10-02 Demag Elektrometallurgie Gmbh Four à électrodes basculant
FR1290741A (fr) * 1961-06-02 1962-04-13 Cie Constr Gros Mat Electromec Dispositif d'équilibrage du système porte-électrodes des fours à arc à régulation électrique
US3181436A (en) * 1962-01-12 1965-05-04 Marmac Company Differential hydraulic cylinder mechanism
DE1216900B (de) * 1965-06-19 1966-05-18 Demag Elektrometallurgie Gmbh Vorrichtung zum Ankuppeln des abhebbaren Ofendeckels an die Elektroden-Hubvorrichtung eines Lichtbogenofens
DE1508471B2 (de) * 1966-12-28 1971-07-01 Demag Elektrometallurgie Gmbh, 4100 Duisburg Selbsttaetige verriegelung
JPS4828632U (ja) * 1971-08-07 1973-04-07
JPS5147992U (ja) * 1974-10-09 1976-04-09

Also Published As

Publication number Publication date
EP0056224A1 (de) 1982-07-21
DE3163688D1 (en) 1984-06-20
JPS57142475A (en) 1982-09-03
US4423515A (en) 1983-12-27
JPS6317989Y2 (ja) 1988-05-20
AT370871B (de) 1983-05-10
ATA3081A (de) 1982-09-15
JPS6181598U (ja) 1986-05-30

Similar Documents

Publication Publication Date Title
EP0056224B1 (de) Elektroofen, wie Lichtbogenofen oder Plasmaschmelzofen
EP0029476A1 (de) Rührwerk
EP0077319B1 (de) Elektroofen
DE4208061C2 (de) Induktionsofen für das Schmelzen und Abgießen von Stoffen in nicht-reaktiver Atmosphäre
DE2549426C2 (de) Innenventil für einen Tankbehälter
DE1589851A1 (de) Einrichtung zum Bedienen der Kernelemente eines Reaktorkernes und Verfahren zur Betaetigung dieser Einrichtung
WO1993010413A1 (de) Einschmelzaggregat mit ofenwiege
CH671453A5 (ja)
EP0470223A1 (de) Metallurgisches aggregat
DE3424254C1 (de) Drehschiebeverschluss
EP0441767B1 (de) Einrichtung zur Medienversorgung an einer Blaslanze
EP1196728A1 (de) Verfahren und vorrichtung zum entleeren von metallurgischen schmelzgefässen durch kippen
DE3404836C2 (de) Schieberverschluß für eine Gießpfanne
EP0173669A2 (de) Kippbares metallurgisches Gefäss
EP0011610B1 (de) Kippbarer Konverter
DE29580394U1 (de) Schrotteinschmelz-Elektro-Lichtbogenofen
DE2844286C2 (ja)
DE2713842C2 (de) Schweißvorrichtung zum Schweißen der Kanten von Blechtüren
DE3047214A1 (de) Elektroschlackeumschmelzofen fuer abschmelzelektroden mit einem elektrodenantrieb
EP0291498A1 (de) Elektroofen, wie Lichtbogenofen oder Plasmaofen
EP4142965B1 (de) Schieberverschluss mit innenliegendem dichtkörper und verfahren zu dessen montage
DE2415341B2 (de) Lagerung für kippbare Konverter
DE2921722C2 (de) Schleusenrohr für anstückelbare Lichtbogenelektroden bei vakuummetallurgischen Anlagen
EP2291596A1 (de) Drehportal für einen ofen
DE69129504T2 (de) Mit lateralen Andruckfedern ausgestatteter Schieberverschluss für metallurgische Gefässe

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE GB IT LU SE

17P Request for examination filed

Effective date: 19820927

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH DE GB IT LI LU SE

REF Corresponds to:

Ref document number: 3163688

Country of ref document: DE

Date of ref document: 19840620

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19841231

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITPR It: changes in ownership of a european patent

Owner name: CESSIONE;VOEST - ALPINE INDUSTRIEANLAGENBAU GMBH

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

REG Reference to a national code

Ref country code: CH

Ref legal event code: PUE

Owner name: VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT MBH

ITTA It: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 81890210.8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19961113

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19961120

Year of fee payment: 16

Ref country code: CH

Payment date: 19961120

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19961121

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971223

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971224

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971231

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19971223

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980901

EUG Se: european patent has lapsed

Ref document number: 81890210.8