EP0577909A1 - Replaceable auxiliary nozzle - Google Patents

Replaceable auxiliary nozzle Download PDF

Info

Publication number
EP0577909A1
EP0577909A1 EP92830368A EP92830368A EP0577909A1 EP 0577909 A1 EP0577909 A1 EP 0577909A1 EP 92830368 A EP92830368 A EP 92830368A EP 92830368 A EP92830368 A EP 92830368A EP 0577909 A1 EP0577909 A1 EP 0577909A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
immersor
sub
refractory material
liquid steel
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.)
Withdrawn
Application number
EP92830368A
Other languages
German (de)
French (fr)
Inventor
Romano Cappelli
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.)
FLOCON ITALIANA Srl
Original Assignee
FLOCON ITALIANA Srl
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 FLOCON ITALIANA Srl filed Critical FLOCON ITALIANA Srl
Priority to EP92830368A priority Critical patent/EP0577909A1/en
Publication of EP0577909A1 publication Critical patent/EP0577909A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50Pouring-nozzles
    • B22D41/56Means for supporting, manipulating or changing a pouring-nozzle

Definitions

  • a replaceable auxiliary nozzle is noted, subject of patent n o 1.220.146 filed by FERRIERE NORD S.p.A., used in a tundish for the continuous casting of steel.
  • Said replaceable auxiliary nozzle henceforward termed, for reasons of simplicity, auxiliary nozzle, is used in association with a fixed nozzle to be found on the bottom of the tundish.
  • Said auxiliary nozzle is positioned on a slide-cursor that slides along the bottom of the tundish and is elastically urged against said fixed nozzle, according to an original system.
  • Said slide-cursor slides along slots that allow the positioning of a second cursor, that carries a second auxiliary nozzle, while the first one is still in a working position, so that, by means of an appropriate positioning system of the second cursor and contemporary expulsion of the first cursor, the replacement of the auxiliary nozzles takes place without having to interrupt the casting cycle. This allows to considerably improve the operation of the casting machinery allowing for a greater number of continuous casting hours.
  • the noted auxiliary nozzle has the disadvantage of not allowing the use of the protective tube for the steel jet, so that, while falling into the ingot-mold, said jet is exposed to contamination.
  • the main problem that is solved by the improvements put forward by the present invention is to obviate the above mentioned disadvantage; they comprise, as characterized in the attached claims, a refractory material element, associated to the outlet port of the auxiliary nozzle, that has a semi-spherical convex or conical bottom surface and a hole that is coaxial with the hole in the auxiliary nozzle and comprises, moreover, a jet protection tube, henceforward simply defined sub-immersor nozzle, that has a semi-spherical conical concave shape at its top, which shape corresponds to the above said convex semi-spherical or conical bottom surface of the said element and a hole coaxial to the hole in said element of refractory material; the length of this sub-immersor nozzle is such that its bottom end remains immersed in the steel cast into the ingot mold.
  • Said control means may be a manipulator programmed to execute all the above operations, or else, only the rotation and a first shift that moves the sub-immersor nozzle away from said element in order to have the total removal performed by a person with the use of suitable tongs.
  • Said refractory material element may be porous, so that it will be blown into, by means of a suitable pipe, with a chemically inert pressurized gas so as to create an over-pressure in the coupling area between the same element and the top of said sub-immersor nozzle to avoid the entry of air into the steel flow.
  • the main advantage of the improvements that are subject of the present invention is that of avoiding the possible contamination of the liquid steel casting during the passage from the auxiliary nozzle to the underlying ingot-mold without having to raise the tundish.
  • FIG. 1 shows part of the bottom end of a tundish 1 with a nozzle 2 that bears an auxiliary nozzle 3 under its outlet port, the latter in turn bears on its bottom end, fixed with a liquid steel proof seal, a porous refractory material element 4 the bottom end of which is a convex semi-spherical surface and a hole 5 coaxial to the hole in the nozzle 3.
  • Said semi-spherical surface is suitable for receiving a corresponding concave semi-spherical surface at the upper end of a sub-immersor nozzle 6.
  • a conventional manipulator 7 is fixed to a ring 8 that holds the upper end of the sub-immersor nozzle 6 and is associated with an arm B that bears a counter-weight 9 at its free end, said arm B is hinged to C, so that said counter-weight keeps the sub-immersor nozzle 6 urged against element 4 with liquid steel sealing.
  • said manipulator provides a rotation to the same sub-immersor nozzle, said rotation has its centre coinciding with the centre of said semi-spherical surfaces and this separates and disconnects said sub-immersor nozzle from said element 4 by means of a first shift, then, by means of further shifts it removes said sub-immersor nozzle from the underlying ingot-mold, not shown in the Figure, without having to raise the above tundish.
  • the figure shows a source of pressurized inert gas 10 and a pipe 11 that penetrates the element 4 so as to blow-into it inert gas in order to create an over-pressure in the contact area between element 4 and the top of sub-immersor nozzle 6 that will avoid the entry of air into the steel flow.
  • FIG. 2 shows an auxiliary nozzle 12, of a non visible tundish, that under its outlet port carries a refractory material element 13 that has a conical convex bottom surface with a hole 14 that is coaxial to the hole in the auxiliary nozzle 12.
  • Said conical surface is suitable for receiving a corresponding concave conical surface of the top end of a sub-immersor nozzle 15.
  • Said sub-immersor nozzle 15 is held by a ring 16 fixed to the end of an arm 17 hinged at C and carrying at the other end a counter-weight 18. The action of said counter-weight keeps the sub-immersor nozzle urged against said element 13 at liquid steel sealing pressure.
  • arm 17 is disconnected from the counter-weight 18 thus allowing the sub-immersor nozzle 13 to rotate downwards; at this point an operator, by means of suitable tongs extracts she sub-immersor nozzle from the underlying ingot mold, not visible in the figure, without having to raise the above tundish.
  • the geometry of the above-mentioned concave and convex conical parts is such that the rotation of the sub-immersor nozzle 15 takes place without interfering with element 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

A replaceable auxiliary nozzle (3) comprises: a refractory material element (4) associated to said nozzle the bottom end of which is a semi-spherical convex or conical surface, a sub-immersor nozzle (6) the top end of which is a convex or conical surface corresponding to the convexity or conical shape of said element (4). A control means (7) controls the position of said sub-immersor nozzle, along with a conter-weight device that serves to keep said sub-immersor nozzle held against the auxiliary nozzle. The coupling between semi-spherical or conical surfaces allows to remove said sub-immersor nozzle, by means of a rotation and further shifts, from the underlying ingot mold without having to raise the above tundish (1).

Description

  • The present invention concerns improvements on a replaceable auxiliary nozzle. The invention especially concerns improvements to a replaceable auxiliary nozzle suitable for use with a tundish for the continuous casting of steel or other metals. The following description will refer only to steel for sake of simplicity.
  • A replaceable auxiliary nozzle is noted, subject of patent no 1.220.146 filed by FERRIERE NORD S.p.A., used in a tundish for the continuous casting of steel. Said replaceable auxiliary nozzle, henceforward termed, for reasons of simplicity, auxiliary nozzle, is used in association with a fixed nozzle to be found on the bottom of the tundish. Said auxiliary nozzle is positioned on a slide-cursor that slides along the bottom of the tundish and is elastically urged against said fixed nozzle, according to an original system. Said slide-cursor slides along slots that allow the positioning of a second cursor, that carries a second auxiliary nozzle, while the first one is still in a working position, so that, by means of an appropriate positioning system of the second cursor and contemporary expulsion of the first cursor, the replacement of the auxiliary nozzles takes place without having to interrupt the casting cycle. This allows to considerably improve the operation of the casting machinery allowing for a greater number of continuous casting hours.
  • In seeking an ever increasing quality of manufactured steels, as the market requires, it is always more essential to provide for the protection of the steel jet from possible contamination, as is for example contact with air.
  • Hence there has been an expansion of adequate protective means, such as ceramic tubes protecting the jet from the ladle to the continuous casting tundish and from here to the underlying ingot-mold.
  • The noted auxiliary nozzle has the disadvantage of not allowing the use of the protective tube for the steel jet, so that, while falling into the ingot-mold, said jet is exposed to contamination.
  • The main problem that is solved by the improvements put forward by the present invention is to obviate the above mentioned disadvantage; they comprise, as characterized in the attached claims, a refractory material element, associated to the outlet port of the auxiliary nozzle, that has a semi-spherical convex or conical bottom surface and a hole that is coaxial with the hole in the auxiliary nozzle and comprises, moreover, a jet protection tube, henceforward simply defined sub-immersor nozzle, that has a semi-spherical conical concave shape at its top, which shape corresponds to the above said convex semi-spherical or conical bottom surface of the said element and a hole coaxial to the hole in said element of refractory material; the length of this sub-immersor nozzle is such that its bottom end remains immersed in the steel cast into the ingot mold. A conventional control means checks the position of said sub-immersor nozzle, together with a conventional counter-weight device that serves to keep the sub-immersor nozzle urged against said auxiliary nozzle with liquid steel sealing. The semi-spherical or conical coupling allows for the rotation of the sub-immersor nozzle, without it substantially lowering and then, by means of further shifts it can be removed from the underlying ingot mold without having to raise the above tundish. In particular the association between semi-spherical surfaces allows to perform the rotation, at a given angle, by sliding the sub-immersor nozzle on said refractory material element, followed by further shifts to remove said sub-immersor nozzle. Said control means may be a manipulator programmed to execute all the above operations, or else, only the rotation and a first shift that moves the sub-immersor nozzle away from said element in order to have the total removal performed by a person with the use of suitable tongs. Said refractory material element may be porous, so that it will be blown into, by means of a suitable pipe, with a chemically inert pressurized gas so as to create an over-pressure in the coupling area between the same element and the top of said sub-immersor nozzle to avoid the entry of air into the steel flow.
  • The main advantage of the improvements that are subject of the present invention is that of avoiding the possible contamination of the liquid steel casting during the passage from the auxiliary nozzle to the underlying ingot-mold without having to raise the tundish.
  • The present invention is described in further detail with reference to the drawings and in which
    • FIG. 1 is a first vertical part cross-section, and
    • FIG. 2 is a second vertical part cross-section.
  • FIG. 1 shows part of the bottom end of a tundish 1 with a nozzle 2 that bears an auxiliary nozzle 3 under its outlet port, the latter in turn bears on its bottom end, fixed with a liquid steel proof seal, a porous refractory material element 4 the bottom end of which is a convex semi-spherical surface and a hole 5 coaxial to the hole in the nozzle 3. Said semi-spherical surface is suitable for receiving a corresponding concave semi-spherical surface at the upper end of a sub-immersor nozzle 6. A conventional manipulator 7 is fixed to a ring 8 that holds the upper end of the sub-immersor nozzle 6 and is associated with an arm B that bears a counter-weight 9 at its free end, said arm B is hinged to C, so that said counter-weight keeps the sub-immersor nozzle 6 urged against element 4 with liquid steel sealing. During the removal stage of the sub-immersor nozzle 6, said manipulator provides a rotation to the same sub-immersor nozzle, said rotation has its centre coinciding with the centre of said semi-spherical surfaces and this separates and disconnects said sub-immersor nozzle from said element 4 by means of a first shift, then, by means of further shifts it removes said sub-immersor nozzle from the underlying ingot-mold, not shown in the Figure, without having to raise the above tundish.
  • Moreover, the figure shows a source of pressurized inert gas 10 and a pipe 11 that penetrates the element 4 so as to blow-into it inert gas in order to create an over-pressure in the contact area between element 4 and the top of sub-immersor nozzle 6 that will avoid the entry of air into the steel flow.
  • FIG. 2 shows an auxiliary nozzle 12, of a non visible tundish, that under its outlet port carries a refractory material element 13 that has a conical convex bottom surface with a hole 14 that is coaxial to the hole in the auxiliary nozzle 12. Said conical surface is suitable for receiving a corresponding concave conical surface of the top end of a sub-immersor nozzle 15. Said sub-immersor nozzle 15 is held by a ring 16 fixed to the end of an arm 17 hinged at C and carrying at the other end a counter-weight 18. The action of said counter-weight keeps the sub-immersor nozzle urged against said element 13 at liquid steel sealing pressure. During the removal stage of said sub-immersor nozzle, arm 17 is disconnected from the counter-weight 18 thus allowing the sub-immersor nozzle 13 to rotate downwards; at this point an operator, by means of suitable tongs extracts she sub-immersor nozzle from the underlying ingot mold, not visible in the figure, without having to raise the above tundish. The geometry of the above-mentioned concave and convex conical parts is such that the rotation of the sub-immersor nozzle 15 takes place without interfering with element 13.
  • It is clearly understood that the solution described in figure 2 involves operations, described above, that can be realized partly or totally by a conventional manipulator.

Claims (3)

  1. Improvements to a replaceable auxiliary nozzle (3) set under the nozzle (2) of a tundish (1) for the continuous casting of liquid steel into an underlying ingot mold characterized in that under the outlet port of the auxiliary nozzle (3) an element (4) of refractory material, is fixed, at liquid steel sealing pressure, bearing a hole (5) coaxial to the hole in the nozzle and that under said element a refractory material sub-immersor nozzle (6), of a length such that it may protect the jet of liquid steel directed into said ingot mold from contamination, is held by a conventional control means (7) at liquid steel sealing, that the contact surfaces between said element (4) and said sub-immersor nozzle (6) have a semi-spherical shape in order to allow the removal of said sub-immersor nozzle (6) from the underlying ingot mold without having to raise the above tundish (1), by means of rotation at a given angle imparted to the same sub-immersor nozzle, so that it will slide on said element (4) without lowering and with further shifting movements.
  2. Improvements according to the Claim 1 characterized in that said refractory material element (14) has the bottom end surface that is conical convex in order to receive a corresponding conical concave surface of the upper end of the sub-immersor nozzle made of refractory material (15).
  3. Improvements according to claims 1 and 2 characterized in that said refractory material element (4, 14) is porous so that it can be blown into by means of a tube (11) with a chemically inert pressurized gas so as to create an over-pressure in the coupling area between the same element (4, 14) and the upper end of said sub-immersor nozzle (6, 15) and thus avoid the entry of air into the steel flow.
EP92830368A 1992-07-10 1992-07-10 Replaceable auxiliary nozzle Withdrawn EP0577909A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92830368A EP0577909A1 (en) 1992-07-10 1992-07-10 Replaceable auxiliary nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92830368A EP0577909A1 (en) 1992-07-10 1992-07-10 Replaceable auxiliary nozzle

Publications (1)

Publication Number Publication Date
EP0577909A1 true EP0577909A1 (en) 1994-01-12

Family

ID=8212137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92830368A Withdrawn EP0577909A1 (en) 1992-07-10 1992-07-10 Replaceable auxiliary nozzle

Country Status (1)

Country Link
EP (1) EP0577909A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199121A1 (en) * 2000-10-20 2002-04-24 SMS Demag AG Device for guiding the flow of a molten metal, especially of a molten steel
WO2009080257A1 (en) * 2007-12-20 2009-07-02 Siemens Vai Metals Technologies Gmbh & Co Device for the interchangeable connection of a casting tube to a spout of a melt vessel
WO2010057640A1 (en) * 2008-11-20 2010-05-27 Vesuvius Group S.A. Casting pipe, device for handling said pipe and valve driving device
EP2301693A1 (en) * 2009-06-29 2011-03-30 Vesuvius Group S.A Shroud nozzle
EP2841222A2 (en) * 2012-04-26 2015-03-04 SMS Concast AG Refractory casting tube for a mould for continuously casting molten metal
US11795950B2 (en) * 2017-07-20 2023-10-24 Pyrotek, Inc. Mold pump engagement apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073573A1 (en) * 1981-08-07 1983-03-09 Steel Castings Research And Trade Association Controlled transfer of molten metal
US4526304A (en) * 1983-05-16 1985-07-02 Allied Corporation Apparatus for rapid changing of nozzles
US4854487A (en) * 1987-12-21 1989-08-08 Akechi Ceramics Co., Ltd. Molten steel pouring nozzle
EP0442515A1 (en) * 1990-02-15 1991-08-21 Romano Dr.-Ing. Cappelli Device for exchanging a submerged nozzle between two metallurgical vessels in a continuous casting plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073573A1 (en) * 1981-08-07 1983-03-09 Steel Castings Research And Trade Association Controlled transfer of molten metal
US4526304A (en) * 1983-05-16 1985-07-02 Allied Corporation Apparatus for rapid changing of nozzles
US4854487A (en) * 1987-12-21 1989-08-08 Akechi Ceramics Co., Ltd. Molten steel pouring nozzle
EP0442515A1 (en) * 1990-02-15 1991-08-21 Romano Dr.-Ing. Cappelli Device for exchanging a submerged nozzle between two metallurgical vessels in a continuous casting plant

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199121A1 (en) * 2000-10-20 2002-04-24 SMS Demag AG Device for guiding the flow of a molten metal, especially of a molten steel
WO2009080257A1 (en) * 2007-12-20 2009-07-02 Siemens Vai Metals Technologies Gmbh & Co Device for the interchangeable connection of a casting tube to a spout of a melt vessel
US8376196B2 (en) 2007-12-20 2013-02-19 Siemens Vai Metals Technologies Gmbh Apparatus for the interchangeable connection of a casting tube to a spout of a melt vessel
WO2010057640A1 (en) * 2008-11-20 2010-05-27 Vesuvius Group S.A. Casting pipe, device for handling said pipe and valve driving device
CN102281972A (en) * 2008-11-20 2011-12-14 维苏威集团有限公司 Casting pipe, device for handling said pipe and valve driving device
AU2009317593B2 (en) * 2008-11-20 2014-05-08 Vesuvius Group S.A. Casting pipe, device for handling said pipe and valve driving device
CN102281972B (en) * 2008-11-20 2014-12-24 维苏威集团有限公司 Casting pipe, device for handling said pipe and valve driving device
US8926893B2 (en) 2008-11-20 2015-01-06 Vesuvius Group S.A. Casting shroud, manipulation device for this shroud, and device for driving a valve
EP2301693A1 (en) * 2009-06-29 2011-03-30 Vesuvius Group S.A Shroud nozzle
EP2841222A2 (en) * 2012-04-26 2015-03-04 SMS Concast AG Refractory casting tube for a mould for continuously casting molten metal
US11795950B2 (en) * 2017-07-20 2023-10-24 Pyrotek, Inc. Mold pump engagement apparatus

Similar Documents

Publication Publication Date Title
CA1097881A (en) Apparatus for changing protective shrouding tubes on casting vessels used in continuous casting
US4290589A (en) Teeming pipe for use at the outlet of a melt container
US4316561A (en) Pour tube latching apparatus
EP0577909A1 (en) Replaceable auxiliary nozzle
EP0718058A1 (en) Replacing device for immersion nozzles
US4084799A (en) Shrouding apparatus
EP1372891B1 (en) Apparatus for transferring liquid metals from a collection container to a receiving container
US4270595A (en) Shroud with replaceable extension
US3978815A (en) Continuous casting apparatus with an articulative sealing connection
AU1215483A (en) Protective gas sheath for jet of molten metal
CA1242067A (en) Horizontal continuous-casting device
EP0081303B1 (en) Apparatus for shielding molten metal during teeming
US5004131A (en) Molten metal slide gate valve
US4840297A (en) Apparatus for shielding a molten metal stream
RU2169054C2 (en) Manipulator for replacement of casting vessel plate and set of plates for this manipulator
DE3560229D1 (en) Apparatus for handling a protection pipe for a pouring jet
US4052044A (en) Method of and apparatus for the decrusting of metallurgical lances
US4211390A (en) Apparatus for shielding molten metal during teeming
US4218048A (en) Suspended gas shroud apparatus
JPH0245542B2 (en)
CA1135935A (en) Apparatus for shielding molten metal during teeming
SU1553241A1 (en) Arrangement for protecting molten metal jet
EP0410651A2 (en) Apparatus and method for shrouding of liquid steel during filling of ingot molds
SU1632616A1 (en) Device for inert gas protection of metal stream
JP3289057B2 (en) Immersion nozzle changer

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

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR IT LI LU

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19940713

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CAPPELLI, ROMANO