EP0445087B1 - Fermeture coulissante pour récipients de coulée, pourvue de ressorts de pression latérale - Google Patents

Fermeture coulissante pour récipients de coulée, pourvue de ressorts de pression latérale Download PDF

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Publication number
EP0445087B1
EP0445087B1 EP91830071A EP91830071A EP0445087B1 EP 0445087 B1 EP0445087 B1 EP 0445087B1 EP 91830071 A EP91830071 A EP 91830071A EP 91830071 A EP91830071 A EP 91830071A EP 0445087 B1 EP0445087 B1 EP 0445087B1
Authority
EP
European Patent Office
Prior art keywords
plate
cover
slide
refractory
fixed
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
EP91830071A
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German (de)
English (en)
Other versions
EP0445087A2 (fr
EP0445087A3 (en
Inventor
Giovanni C/O Nuova Sanac S.P.A. Timossi
Franco C/O Ilva S.P.A. Cecchi
Giancarlo C/O Ilva S.P.A. Martelli
Roberto Nuova Sanac S.P.A. Ricci
Massimo C/O Nuova Sanac S.P.A. Filippi
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.)
Vesuvius Italia SpA
Original Assignee
Vesuvius Italia SpA
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Publication date
Application filed by Vesuvius Italia SpA filed Critical Vesuvius Italia SpA
Publication of EP0445087A2 publication Critical patent/EP0445087A2/fr
Publication of EP0445087A3 publication Critical patent/EP0445087A3/en
Application granted granted Critical
Publication of EP0445087B1 publication Critical patent/EP0445087B1/fr
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 object of the present invention is a box nozzle with lateral pressure springs, for ladles.
  • Box nozzles have been used for several years for discharging ladle, tundishes and the like, stagewise, if desired.
  • Box nozzles consist basically of a pair of refractory plates, one fixed, the other movable, each with an orifice: relative movement of these two plates permits regulation of the size of the opening through which the liquid steel leaves the ladle.
  • 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 that surrounds it.
  • a support and movement 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 metal plate, and the moving one to the upper face of the slide.
  • French Patent Publication 2,247,302 refers to a box nozzle comprising a first fixed refractory plate, provided with a through orifice, and a second movable refractory plate, also with a through orifice, inserted in a metallic slide pivoting around a pin, to permit opening and closing of a passage, consisting in the through orifices, for liquid metal.
  • the slide rests on springs, to urge said movable refractory plate against said fixed refractory plate; the pin, however, allows the slide, and hence the moving refractory plate, to move only about the axis of the pin itself.
  • said means of connection must be such as to ensure precise, rapid and safe control by the operators.
  • US Patent 4,660,749 utilizes a slide resting on a set of fully preloaded springs.
  • a bracket is rotated around a hinged joint to bring said refractory plates into mutual contact, and then a nut, opposed to said hinged joint, is tightened.
  • the fixed and movable refractory plates contact each other only at the edges thereof closest to the hinged joint; the forces created by tightening of said nut are concentrated at said edges, thereby causing cracking or otherwise damaging thereof.
  • box nozzle As the size of box nozzle increases, it becomes more and more difficult to achieve the above conditions simply and safely, guaranteeing good reliability.
  • an intermediate frame which tilts on two perpendicular axes lying in the plane of movement of the slide, is inserted between the slide and the cover. Inclination of said tilting frame is achieved by means of two rows of springs supported by the cover and parallel to the long sides thereof.
  • the long sides of the intermediate tilting frame rest on the two rows of springs.
  • the slide on which is mounted the sliding refractory plate runs in guides on top of the tilting frame.
  • the tilting frame can always keep the two counterposed faces of the fixed and movable refractory plates in perfect contact with one another.
  • the means of connection between the cover and the fixed upper refractory plate consist of bolts that are hinged at one end. Said bolts are tightened until the faces of said cover and said fixed upper metal plate are completely flush: hence the bolt-tightening operations call for no particular control by means of torque spanners, for example. However, the tightening operation is done last.
  • spring assemblies which protrude from the upper face of said cover, are inserted on the bottom of the cover through threaded holes.
  • the tilting frame is rested on the protuding ends of the spring assemblies and the moving slide is rested on top of this.
  • Two pairs of counterposed guide strips are placed between the tilting frame and slide.
  • the edges of the slide are then pushed towards the cover by means of a pair of counter-strips that are fixed to the cover by screws. Tightening the screws results in an initial compression of the spring assemblies, urging the ensamble of tilting frame, slide and related refractory plate and nozzle against protruding strips of the cover; the ensamble is thus firmly kept in position, to prevent movable parts such as the slide from accidentally falling, and to avoid an excessive initial pressure between the refractory plates.
  • the cover which is now equipped with springs, tilting frame and slide, is turned over against the fixed upper metal plate and is pressed against it by fully tightening the hinged bolts which connect the cover to the fixed upper plate.
  • the spring assemblies receive a second and definitive compression which ensures that the counterposed faces of the fixed and movable refractory plates are urged elastically against one another.
  • Such definitive compression causes the slide to be detached from said protruding strips, thus permitting the tilting frame to find its proper position and the fixed and movable refractory plates to be in perfect contact.
  • 10 indicates the fixed upper metal plate that is attached to the bottom of the ladle. Drilled hinge-pieces 11 and 12 are fixed to the longitudinal side of said plate. Hinged to these via pins are bolts 13 and catches 14.
  • Said fixed lower plate known as the cover, is actually formed of a robust quadrangular frame with variously-shaped internal longitudinal flanges 21 in each of which are two large threaded holes 22, and external longitudinal flanges 23.
  • the external flanges have notches 24 and 25 to permit the passage of bolts 13 and catches 14.
  • Spring assemblies 40 are inserted in holes 22.
  • the assemblies protrude from the upper face of cover 20 and provide elastic support for tilting frame 50 complete with seats 51 for the upper ends of the spring assemblies.
  • Tilting frame 50 is complete with a large central opening 52 (see Figs. 5 and 12) which is roughly rectangular in shape.
  • Fixed refractory plate 30 is mounted against the lower face 16 of the fixed upper plate.
  • Fixed upper refractory coupling 31 rests against said fixed refractory plate.
  • a small plate 80 which is attached to the upper face of a heat shield 81, connected to a ferrule 82 which surrounds and protects refractory coupling 71 that is attached to sliding plate 70.
  • guide strips 62 fixed to the long sides of slide 60, destined to run on guide strips 53 attached to tilting frame 50.
  • a third pair of strips 63 is fixed to the upper face of the long sides of cover 20 and, together with guide strips 53, ensures heightwise restriction of the movement of slide 60 which is moved by connecting shaft 83.
  • the third fixed refractory coupling 32 which surrounds coupling 31 and rests against the upper surface of levelling plate 33, is visible in Fig.2.
  • Coupling 32 is surrounded by the inner refractory lining 35 of the ladle.
  • Fig.2 also illustrates the metal cladding 36 of fixed plate 30, as well as the metal claddings 72 and 73 of sliding refractory plate 70 and sliding coupling 71.
  • catch 14 does not support flange 23 when nuts 15 are tightened, since its 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 catch to the position illustrated in Fig.2.
  • Catch 14 also provide a guarantee against accidental opening of bolts 13.
  • Fig.3 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. It also illustrates the way spring assembly 40 supports tilting frame 50 on which slide 60 moves along guide strips 53 and 62.
  • Fig.4 illustrates in greater detail the Belleville washers 41 of assembly 40: the springs are inserted on flanged bush 42 which, in turn, is inserted on pin 43 that has a retaining ring 44 at one end while the other is screwed to a cap 45 whose outer cylindrical surface is threaded and screwed in ring 46 that is also threaded externally.
  • ring 46 is solely to create a wear thread on cover 20 and so, from the functional aspect, it can be considered to form an integral part of cover 20 in whose threaded holes 22 it is screwed by means of its external thread.
  • Spring assembly 41 formed of parts 41, 42, 43, 44 and 45, is screwed in hole 22, already equipped with ring 46, until it comes up against the outer flange of cap 45.
  • the spring assembly 40 can be fitted up with cover 20 in the open position illustrated in Fig.1 and, after this has been done, flanged bushes 42 rest against retaining rings 44 protruding from the inner face of cover 20.
  • tilting frame 50 In a second stage tilting frame 50 is rested against the ends 42 of spring assemblies 40. Subsequently slide 60 is rested on the frame.
  • clearance 120 (Fig.4) is nil owing to the thrust of the springs.
  • Fig.4 also clearly illustrates conduit 47 which carries cold air to springs 41 via minor passages 48.
  • Figs 6, 7 and 8 show the structural details of fixed upper metal plate 10 with recess 111 on its upper surface to receive the base of the third fixed refractory coupling 32, inserted into the ladle, as visible in Figs 3 and 4.
  • the entire fixed upper metal plate 10 is pierced by a circular hole 112 which - as can be seen from Figs 2 and 3 - serves for the passage of the lower end of fixed refractory coupling 31 which can be extracted from below, from the outside of the ladle.
  • the lower face of fixed upper metal plate 10 also has elongated recess 113 for housing fixed upper refractory plate 30.
  • grooves 114 On the bottom of recess 112 are grooves 114 to facilitate correct positioning of fixed upper refractory plate 30 which, as already mentioned, is metal clad on the top and the sides. The same metal cladding is also utilized to retain refractory plate 30 in recess 113 by means of cylindrical magnets housed in blind holes 118.
  • Holes 117 in fixed upper metal plate 10 serve to fix it to ladle-bottom levelling plate 33 via screws.
  • sliding refractory plate 70 which, as already mentioned, is metal clad on the lower face and sides so as to permit the use of cylindrical magnets housed in circular holes 163 on the bottom of recess 162.
  • One end of slide 60 has threaded holes 164 for connecting to control shaft 83.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Springs (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Claims (6)

  1. Fermeture coulissante pour poches de coulée et analogues, du type comprenant :
    (i) une plaque métallique supérieure fixe (10) attachée à la base de la poche et portant de façon articulée
    (ii) une plaque métallique inférieure (20), appelée couvercle, qu'on peut faire pivoter entre une position ouverte, sensiblement perpendiculaire à la plaque supérieure (10), et une position fermée, parallèle à la plaque supérieure (10) et proche de celle-ci, et qui est maintenue dans la position fermée par des vis (13) et des écrous (15) et est séparable de la plaque supérieure (10) pour l'entretien de la fermeture coulissante ;
    (iii) une troisième plaque métallique (60), appelée opercule, placée entre la plaque supérieure (10) et le couvercle (20) et qui coulisse à l'intérieur de ce dernier, entraínée par des moyens d'entraínement (83) ;
    (iv) une première plaque réfractaire (30) ayant un orifice traversant et maintenue dans une position fixe à l'intérieur de la plaque supérieure (10) ;
    (v) une deuxième plaque réfractaire (70) ayant un orifice traversant et maintenue dans une position fixe à l'intérieur dudit opercule (60) et qui coulisse avec ce dernier à l'intérieur du couvercle (20) ; ladite deuxième plaque réfractaire (70) étant placée en contact avec la première plaque réfractaire (30)quand le couvercle (20) est maintenu dans la position fermée contre la plaque supérieure (10) de sorte que, dans cette position fermée, l'opercule (60) est suspendu de façon coulissante sur un ensemble de dispositifs à ressort (40) et est libre de se déplacer, sollicité par chacun desdits ressorts, de manière à s'adapter à tout défaut d'alignement entre les plaques réfractaires (30) et (70), la seule liaison entre l'opercule (60) et la plaque fixe supérieure (10) étant par l'intermédiaire du contact glissant entre la plaque réfractaire (70) insérée dans l'opercule (60) et la plaque réfractaire (30) insérée dans la plaque fixe supérieure (10) ; caractérisée en ce que des bandes de guidage (63) sont fixées à la face supérieure des grands côtés du couvercle (20) et font saillie à partir de cette face vers l'opercule (60), lesdites bandes (63) étant en contact et coopérant avec les bords de l'opercule (60) et avec les dispositifs à ressort (40) vissés dans la face inférieure du couvercle (20) de façon à maintenir l'opercule (60), le cadre basculant (50) et les parties réfractaires (70,71) en place lorsqu'on ouvre la fermeture coulissante autour des charnières (11,12), et les dites bandes s'éloignant desdits bords seulement lorsque les écrous (15) sont serrés, de façon à créer un jeu (120) et à permettre un mouvement libre de l'opercule (60) et du cadre basculant (50).
  2. Fermeture coulissante suivant la revendication 1, caractérisée en ce que des paires de bandes de guidage (53,62) sont connectées aux grands côtés en opposition de l'opercule (60) et du cadre basculant (50).
  3. Fermeture coulissante suivant une quelconque des revendications précédentes, caractérisée en ce que lesdits dispositifs à ressort (40) consistent chacun en un ensemble de rondelles Belleville (41) insérées sur une tige (43) entre un manchon épaulé (42) et un bouchon fileté (45), chaque dit bouchon fileté (45) étant vissé dans un trou taraudé (22) du couvercle (20), et une pluralité dedits trous taraudés (22) étant alignés le long des grands côtés du cadre basculant (50) sur lequel s'appuie chacun desdits manchons épaulés (42).
  4. Fermeture coulissante suivant une quelconque des revendications précédentes, caractérisée en ce que, sur les grands côtés dudit couvercle (20), il est prévu des conduits (47) d'amenée d'air sous pression pour refroidir lesdits dispositifs à ressort (40).
  5. Fermeture coulissante suivant une quelconque des revendications précédentes, caractérisée en ce que la face supérieure de la plaque réfractaire fixe (30) et la face inférieure de la plaque réfractaire (70) ainsi que les faces latérales des deux plaques sont toutes revêtues de métal, et en ce qu'un raccord (71), également en matière réfractaire, placé sous ladite plaque réfractaire coulissante (70), est également revêtu de métal et en outre protégé par un embout (82) servant de support à un écran thermique (81).
  6. Fermeture coulissante suivant une quelconque des revendications précédentes, caractérisée en ce que le couvercle (20) est maintenu de façon sûre dans sa position entièrement fermée par un verrou pivotant (14) maintenu en contact avec le couvercle (20) par des aimants (18), l'insertion dudit verrou (14) dans une fente (25) indiquant le serrage correct des écrous (15) sur les vis (13).
EP91830071A 1990-03-02 1991-03-04 Fermeture coulissante pour récipients de coulée, pourvue de ressorts de pression latérale Expired - Lifetime EP0445087B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1243590 1990-03-02
IT12435A IT1240587B (it) 1990-03-02 1990-03-02 Scaricatore a cassetto per siviere e simili, a molle di pressione laterale

Publications (3)

Publication Number Publication Date
EP0445087A2 EP0445087A2 (fr) 1991-09-04
EP0445087A3 EP0445087A3 (en) 1992-04-29
EP0445087B1 true EP0445087B1 (fr) 1998-06-03

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Application Number Title Priority Date Filing Date
EP91830071A Expired - Lifetime EP0445087B1 (fr) 1990-03-02 1991-03-04 Fermeture coulissante pour récipients de coulée, pourvue de ressorts de pression latérale

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Country Link
EP (1) EP0445087B1 (fr)
AT (1) ATE166815T1 (fr)
DE (2) DE445087T1 (fr)
ES (1) ES2031795T3 (fr)
IT (1) IT1240587B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE173967T1 (de) * 1992-09-28 1998-12-15 Vesuvius Italia Spa Mit lateralen torsionsstäbe ausgestatteter schieberverschluss für metallurgische gefässe
DE602004012901T2 (de) * 2004-09-07 2009-04-02 Co.Me.Ca Costruzioni Meccaniche Carpenteria S.P.A. Ausgabevorrichtung für den stahlguss u. ä.
CN110369700B (zh) * 2019-07-08 2021-07-09 唐山不锈钢有限责任公司 一键式远程钢包车定位及自动摘盖加盖控制装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1004615B (it) * 1973-10-16 1976-07-20 Sirma Soc Italiana Otturatore con organo mobile azio nabile in movimento angolare parti colarmente per il controllo del flusso di metalli fusi da conteni tori o siviere
JPH0335481Y2 (fr) * 1984-09-11 1991-07-26
EP0400256B1 (fr) * 1989-06-02 1993-12-22 NUOVA SANAC S.p.A. Dispositif de fermeture à coulisse pour poches de coulée et récipients similaires

Also Published As

Publication number Publication date
ES2031795T3 (es) 1998-10-16
ATE166815T1 (de) 1998-06-15
DE445087T1 (de) 1992-04-30
IT1240587B (it) 1993-12-17
DE69129504D1 (de) 1998-07-09
EP0445087A2 (fr) 1991-09-04
IT9012435A1 (it) 1991-09-02
EP0445087A3 (en) 1992-04-29
DE69129504T2 (de) 1999-01-07
IT9012435A0 (it) 1990-03-02
ES2031795T1 (es) 1993-01-01

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