EP0590174B1 - Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe - Google Patents

Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe Download PDF

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Publication number
EP0590174B1
EP0590174B1 EP92116553A EP92116553A EP0590174B1 EP 0590174 B1 EP0590174 B1 EP 0590174B1 EP 92116553 A EP92116553 A EP 92116553A EP 92116553 A EP92116553 A EP 92116553A EP 0590174 B1 EP0590174 B1 EP 0590174B1
Authority
EP
European Patent Office
Prior art keywords
cover
plate
refractory
slide
metal plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92116553A
Other languages
English (en)
French (fr)
Other versions
EP0590174A1 (de
Inventor
Roberto Ricci
Massimo Filippi
Ugo Della Foglia
Maurizio Merli
Giuliano Passarella
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.)
Dalmine SpA
Vesuvius Italia SpA
Original Assignee
Dalmine SpA
Vesuvius Italia SpA
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 Dalmine SpA, Vesuvius Italia SpA filed Critical Dalmine SpA
Priority to AT92116553T priority Critical patent/ATE173967T1/de
Priority to DE69227770T priority patent/DE69227770D1/de
Priority to EP92116553A priority patent/EP0590174B1/de
Publication of EP0590174A1 publication Critical patent/EP0590174A1/de
Application granted granted Critical
Publication of EP0590174B1 publication Critical patent/EP0590174B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/40—Means for pressing the plates together

Definitions

  • the present invention relates to a box nozzle with lateral torsion bars according to the preamble of claim 1.
  • Box nozzles have now been used for several years for discharging ladles, tundishes and the like, if desired. Their use has gradually extended to ever-larger ladles and their reliability has grown in parallel with the improvement in quality of the refractories available on the market.
  • Box nozzles consist basically of a pair of refractory plates, one fixed and the other movable, each with an orifice.
  • Said pair of refractory plates is associated with a first refractory coupling positioned beneath the sliding plate and moving with it, and a second refractory coupling, positioned above the fixed refractory plate, inserted in the thickness of the refractory lining of the ladle plus a third refractory coupling which surrounds it.
  • a support and moving device which generally includes:
  • the aforesaid metal plates have a large central opening, of course.
  • the two refractory plates with orifices are suitably anchored, the fixed one to the lower face of the fixed upper plate, and the moving one to the upper face of "the slide".
  • GB 2 158 380 A utilized for forming the preamble of claim 1, discloses a sliding valve gate in which pivotable side members support torsion bars acting on rocker arms to thrust valve plates into leak-tight contact with one another. Two torsion bars act on each rocker arm.
  • Bolts and nuts are utilized to draw side members towards one another and to adjust the level of stress in the torsion bars. Due to necessity of using two torsion bars for each rocker arm, the sliding valve gate is cumbersome; moreover, all the torsion bars can only receive the same level of stress, which in some cases could be inconvenient.
  • the tilting frame was thus substained by an elastic bed which allowed the counterposed faces of the fixed and movable refractory plates to rest securely on one another, thus ensuring a good distribution of the pressures over the surfaces in mutual contact.
  • the arrangement of the spring assemblies around the long sides of "the cover” permitted the springs to be kept as far as possible from the central orifice in the refractory plates and hence from the source of heat generated by the flow of molten metal.
  • the spring assemblies could only partially be moved away from the heat source because the diameter of the assemblies themselves was a large fraction of the width of the box nozzle. Hence the average working temperature of these spring assemblies was still quite high, so they gradually came to lose their elasticity.
  • the aim of the present invention is to eliminate the above drawbacks and also to ensure means for protecting the stream of liquid metal so as to prevent contact with the surrounding air.
  • the tilting frame is pushed against the fixed upper metal plate by at least two counterposed pairs of cranks connected to the free ends of torsion bars, while the other ends are fixed to "the cover".
  • the torsion bars Because of the elongated form of the torsion bars, they can be positioned on the long sides of "the cover". In other words, they can be positioned as far away as possible from the heat source, so that they retain their elasticity for a long time, thus reducing the amount of maintenance.
  • reference number 10 indicates the fixed upper metal plate that is attached to the bottom of the ladle by means of screws not indicated in detail. Drilled hinge-pieces 11 and 12 are fixed to the long side of said plate.
  • Hinged to these via pins are bolts 13 and catches 14.
  • fixed upper plate 10 supports a lower metal plate 20, which is also fixed when the box nozzle is in operation but can be detached from the fixed upper plate for nozzle maintenance operations.
  • Said lower plate 20 known as "the cover” is actually formed of a robust quadrangular frame with two pairs of lugs 21 on the external longitudinal sides, pierced by splined holes 22 on the horizontal plane.
  • Said cover 20 provides also external longitudinal flanges 23 above said lugs 21. The external flanges have notches 24 and 25 to permit the passage of bolts 13 and catches 14.
  • One splined end 41 of a solid shaft is inserted into each of the splined holes 22, while the other splined end 42 is inserted in the end-bush 43 - also splined - of another shaft 44 which is hollow, coaxial with and placed over said solid shaft 40.
  • These solid and hollow shafts together form the torsion bars.
  • crank 45 which protrudes through a slot 26, with its free end 46 inside the long sides of the cover 20.
  • the cover 20 also has an ample rectangular opening 28 for the passage of the sliding coupling 71 and, on its transverse edges, it also has ample passages 129 for the actuating rod 83 of a hydraulic ram 84 which is fixed to the cover 20 by screws and threaded holes 85.
  • cranks 45 provide a flexible support for a tilting frame 50 which has specific seats 51.
  • the tilting frame 50 has an ample central opening 52 roughly rectangular in shape, while on the upper face of its long sides there are guide strips 53 for slide 60 which has a circular central opening 61.
  • the sliding refractory plate 70 is mounted on the upper face of slide 60.
  • Fixed refractory plate 30 is mounted against the lower face 16 of the fixed upper plate 10. Fixed upper refractory coupling 31 rests against said fixed refractory plate 30.
  • guide strips 62 fixed to the long sides of slide 60, destined to run on guide strips 53 attached to the tilting frame 50.
  • a third pair of strips 63 is fixed to the upper face of the long sides 27 of cover 20 and, together with guide strips 53, ensures heightwise restriction of the movement of slide 60 which is actuated by rod 83 of ram 84.
  • the third fixed refractory coupling 32 which surrounds coupling 31 and rests against the upper surface of levelling plate 33, welded to the bottom 34 of the ladle, is shown in Fig.1.
  • Coupling 32 is surrounded by the inner refractory lining 35 of the ladle.
  • Fig.1 also illustrates the metal plating 36 of fixed plate 30, as well as the metal plating 72 and 73 of sliding refractory plate 70 and sliding coupling 71.
  • catches 14 do not support flange 23 when nuts 15 are tightened, since their function is to indicate to the operator that nuts 15 have been completely tightened: if this is not the case, it is not possible to tilt the catches to the position illustrated in Fig.1.
  • Catches 14 also prvide a guarantee against accidental opening of bolts 13.
  • Fig.1 shows magnets 18 inserted in corresponding cavities of catches 14 and which act on the sides of cover 20 preventing the catches from turning outwards.
  • annular cavity 87 is visible between the external surface of the sliding refractory coupling 71 and its metal plating 73.
  • this annular cavity is pressure fed with an inert gas - e.g. argon - and on its turn it feeds the pressurized inert gas beneath the metal plating 73, through channels 89 obtained via grooves cut on the outer surface of coupling 71; said grooves are covered by plating 73 of coupling 71.
  • conduit 86 when the inert gas is pressure fed into conduit 86, it enters first into annular cavity 87 and then into channels 89 whence it emerges to create a protective layer about the steel casting which prevents oxidation of the steel by the atmosphere.
  • Fig.2 shows how cranks 45 support tilting frame 50 on which runs slide 60 through guide strips 53 and 62.
  • cranks 45 When cranks 45 are not pressed against the bottom of tilting frame 50, at rest, their axis is horizontal; in the case illustrated, the angle (y) represents the elastic deformation imposed on the crank and the two shafts 40 and 44, which corresponds to a very precise force applied to the end of the crank at the bottom of the tilting frame 50.
  • cranks will be selected according to the force that these must exert on the bottom of tilting frame 50.
  • Lugs 17 are mounted on pins 19 supported by hinge-pieces 11 or 12 protruding from the sides of the fixed upper plate 10. Said hinge-pieces 11 or 12 are fixed to the sides of plate 10 by screws and are not shown in Figs.4-6.
  • angle (y) can vary within fairly wide limits so as to achieve the desired locking force between cranks 45 and tilting frame 50, between this and slide 60, between slide 60 (through guides 63 and 62) and refractory plate 70 and finally between this and fixed refractory plate 30.
  • the locking force can also vary within broad limits because, in the design phase, the diameters and, if necessary, the lengths of shafts 40 and 44 can be varied precisely for this purpose.
  • Strips 63 which are fixed on flanges 23 of cover 20 when this is still open, can produce an initial deformation of torsion bars 40 and 44, endowing them with a preliminary loading.
  • Figs.4, 5 and 6 provide structural details of fixed upper metal plate 10 which has a rectangular recess 111 on its upper surface to receive the upper metal-clad base of fixed upper refractory plate 30.
  • the entire fixed upper metal plate 10 is pierced by a circular hole 112, which serves for the passage of the lower end of fixed refractory coupling 31 that can be extracted from below, from the outside of the ladle.
  • Grooves 113 are on the bottom of recess 111 to facilitate correct positioning of fixed upper refractory plate 30.
  • the metal plating of the upper face and of the sides of fixed upper refractory plate 30 is also utilized to retain said refractory plate 30 in position in recess 111 by means of cylindrical magnets housed in blind holes 114.
  • Centring and positioning recesses 115 and 116 for fixed hinge-pieces 11 and 12 are also provided on the long sides of fixed upper metal plate 10. Said hinge-pieces are attached to said metal plate by screws that, for simplicity, are indicated in Fig.2 only by the simmetry axis.
  • tilting frame 50 The structural details of tilting frame 50, shown in Figs.10 to 12, have also been referred to above.
  • the upper face of the latter also has an elongated recess 162 to house sliding refractory plate 70 which, as stated above, is metal clad on the lower face and on sides, allowing therefore the use of cylindrical magnets housed in circular holes 163 on the bottom of recess 162.
  • One end of slide 60 has means for connecting to actuating rod 83.
  • the locking bolts which hold cover 20 can be replaced by pairs of rotating stirrups, as described in the Italian Patent Application mentioned in the introductory part of this Description.
  • sliding refractory coupling 71 instead of the axial channels 89 on its outer surface, it could have radial conduits which emerge in its axial casting hole; and as an alternative, there could be a porous zone that produces the same effect as said radial channels.
  • axial channels 89 are the preferred embodiment, since they do not weaken the structure of the sliding refractory coupling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)

Claims (5)

  1. Schieberverschluß für metallurgische Gefäße (Gießpfannen) und dgl. des Typs, der umfaßt
    a) eine feststehende obere Metallplatte (10), die mit dem Boden (der Unterseite) des metallurgischen Gefäßes (der Gießpfanne) verbunden ist;
    b) eine untere Metallplatte (20), hier als "Abdeckung" bezeichnet, die von der ersteren mittels Bolzen (13) getragen wird und schwenkbar und von der ersteren abnehmbar ist für die Wartung des Schieberverschlusses;
    c) eine dritte Metallplatte (60), die zwischen den obengenannten beiden durch geeignete Kontrollen läuft, hier als "Schieber" bezeichnet;
    d) eine erste feuerfeste Platte (30) mit einem Loch, die durch die feststehende obere Metallplatte (10) in einer festen Position gehalten wird;
    e) eine zweite feuerfeste Platte (70), die ein Loch aufweist und durch den Schieber (60) festgehalten wird und somit zusammen mit letzterem gleitet;
    f) einen Kipprahmen (50), der zwischen den Schlitten (60) und der Abdeckung (20) eingesetzt ist;
    g) eine elastische Träger-Einrichtung in Form von vier Torsionsstäben, die zwischen der Abdeckung (20) und dem Kipprahmen (50) parallel ausgerichtet zu den Längsseiten der Abdeckung (20) angeordnet sind;
    dadurch gekennzeichnet, daß jeder der genannten Torsionsstäbe umfaßt eine Vollwelle (40), die mit einem ersten kerbverzahnten (keilförmigen) Ende (41), das in ein kerbverzahntes (keilförmiges) Loch (22) der unteren Platte (20) eingesetzt ist, und mit einem zweiten freien kerbverzahnten (keilförmigen) Ende (42) ausgestattet ist, das in eine entsprechende kerbverzahnte (keilförmige) Endhülse einer Hohlwelle (44) eingesetzt ist, die sich um die genannte Welle (40) herum und über diese in Richtung auf das erste Ende (41) erstreckt, wobei das freie Ende der Welle (44), das dem Ende (41) am nächsten liegt, eine Kurbel (45) trägt, die dazu dient, den Gleitrahmen (60) über den dazwischenliegenden Rahmen (50) elastisch zu unterstützen.
  2. Schieberverschluß nach Anspruch 1, dadurch gekennzeichnet, daß die genannte Kurbel (45) durch einen Schlitz (26) die Längsseite (27) der Abdeckung (20) passiert.
  3. Schieberverschluß nach den vorhergehenden Ansprüchen, dadurch gekennzeichnet, daß die Bolzen (13) zwischen der feststehenden oberen Metallplatte (10) und der Abdeckung (20) in einer bündigen Position befestigt sind, welche die relative Position zwischen der Platte (10) und der Abdeckung (20) eindeutig festlegt.
  4. Schieberverschluß nach den vorhergehenden Ansprüchen, dadurch gekennzeichnet, daß eine feuerfeste Gleitkupplung (71) auf ihrer äußeren Oberfläche mit einer ringförmigen Nut und axialen Nuten versehen ist, die gemeinsam zusammen mit einer äußeren Metallplattierung (73) der genannten Kupplung (71) einen ringförmigen Hohlraum (87) bilden, der als Verteiler für ein unter Druck stehendes Gas dient, und die entsprechende axiale Kanäle (89) aufweist, die auf der unteren Oberfläche der feuerfesten Kupplung (71) um das flüssige Metall herum eine Austragsleitung bilden.
  5. Verwendung der vier Torsionsstäbe nach den Ansprüchen 1 und 2 in Schieberverschlüssen, wie sie in Anspruch 1 definiert sind, zum elastischen Anpressen des Schiebers (60) zusammen mit der relevanten feuerfesten Platte (70) an die feuerfeste Platte (30) in der feststehenden oberen Platte (10).
EP92116553A 1992-09-28 1992-09-28 Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe Expired - Lifetime EP0590174B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT92116553T ATE173967T1 (de) 1992-09-28 1992-09-28 Mit lateralen torsionsstäbe ausgestatteter schieberverschluss für metallurgische gefässe
DE69227770T DE69227770D1 (de) 1992-09-28 1992-09-28 Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe
EP92116553A EP0590174B1 (de) 1992-09-28 1992-09-28 Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92116553A EP0590174B1 (de) 1992-09-28 1992-09-28 Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe

Publications (2)

Publication Number Publication Date
EP0590174A1 EP0590174A1 (de) 1994-04-06
EP0590174B1 true EP0590174B1 (de) 1998-12-02

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Application Number Title Priority Date Filing Date
EP92116553A Expired - Lifetime EP0590174B1 (de) 1992-09-28 1992-09-28 Mit lateralen Torsionsstäbe ausgestatteter Schieberverschluss für metallurgische Gefässe

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EP (1) EP0590174B1 (de)
AT (1) ATE173967T1 (de)
DE (1) DE69227770D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10033904A1 (de) * 2000-07-12 2002-01-31 Stopinc Ag Huenenberg Schieberverschluss zum Vergiessen von Metallschmelze, sowie eine dazugehörige feuerfeste Platteneinheit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1559527A (en) * 1976-08-03 1980-01-23 Flogates Ltd Pouring of molten metals
IT1106745B (it) * 1978-12-22 1985-11-18 Sanac Spa Ispositivo per il bloccaggio elastico mediante barre di torsione di uno scaricatore a cassetto
GB8412100D0 (en) * 1984-05-11 1984-06-20 Flogates Ltd Auxiliary attachment for molten metal vessels
IT1240587B (it) * 1990-03-02 1993-12-17 Nuova Sanac S.P.A. Scaricatore a cassetto per siviere e simili, a molle di pressione laterale

Also Published As

Publication number Publication date
DE69227770D1 (de) 1999-01-14
EP0590174A1 (de) 1994-04-06
ATE173967T1 (de) 1998-12-15

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