EP1885516B1 - Stopfenstange - Google Patents

Stopfenstange Download PDF

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Publication number
EP1885516B1
EP1885516B1 EP06744052A EP06744052A EP1885516B1 EP 1885516 B1 EP1885516 B1 EP 1885516B1 EP 06744052 A EP06744052 A EP 06744052A EP 06744052 A EP06744052 A EP 06744052A EP 1885516 B1 EP1885516 B1 EP 1885516B1
Authority
EP
European Patent Office
Prior art keywords
stopper rod
sealing means
carrier element
insert
rod body
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.)
Active
Application number
EP06744052A
Other languages
English (en)
French (fr)
Other versions
EP1885516A2 (de
Inventor
Mark Payne
Gerald Nitzl
Werner Schlottbohm
Horst-Günther HENRICH
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.)
Refractory Intellectual Property GmbH and Co KG
Original Assignee
Refractory Intellectual Property GmbH and Co KG
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
Priority claimed from GB0511202A external-priority patent/GB0511202D0/en
Priority claimed from GB0523894A external-priority patent/GB0523894D0/en
Application filed by Refractory Intellectual Property GmbH and Co KG filed Critical Refractory Intellectual Property GmbH and Co KG
Publication of EP1885516A2 publication Critical patent/EP1885516A2/de
Application granted granted Critical
Publication of EP1885516B1 publication Critical patent/EP1885516B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor
    • 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
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor
    • B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt

Definitions

  • This invention relates to a stopper rod for controlling the flow of molten metal, for example from a vessel, such as a tundish, to a mould, and more preferably, to a stopper rod for supplying an inert gas to the melt in the vessel.
  • Such a stopper rod is well know, it being moved in the direction of its longitudinal axis by a lifting device external to the vessel in which the stopper rod is disposed, so that an outlet opening in the base of the vessel, into which the stopper rod fits at its lowest position, shutting it off completely, is opened either more or less. The flow of metal through the opening is thus controllable.
  • DE 91 09 536 U1 describes a stopper rod having a retention collar (28b).
  • a seal (26) is provided on the underside of the retention collar and ceramic sleeve (34) is provided on the upper side of the retention collar (28b).
  • a sealant substance (32) fills the annular space (30) around the retention collar (28b).
  • DE 40 40 189 C1 describes a stopper rod comprising a carrier tube (1) having a collar (23). A threaded sleeve (25) is located directly above the collar (23) and a single seal (15) is located above the threaded sleeve (25).
  • EP 0358535 describes a stopper rod comprising a metal rod (30) having an enlarged flange portion (46).
  • a sealing gasket (48) is provided on the frustoconical undersurface of the enlarged flange portion (46).
  • An object of the invention is to provide a stopper rod in an improved form.
  • a stopper rod comprising a refractory material stopper rod body having an internal passageway extending from a first end of the body towards a second end thereof, a metal carrier element having one of its ends received in said passageway, the carrier element having a laterally enlarged portion received in a laterally enlarged portion of the passageway, which passageway portion defines a seating surface, and sealing means between said seating surface and an underside of the laterally enlarged portion of the carrier element, wherein an insert is threadedly engaged with one of the carrier element and the stopper rod body at a position above said laterally enlarged portion of the carrier element, with further sealing means being disposed between said insert and the carrier element.
  • the carrier element which serves, in use, to connect the stopper rod to a lifting device, has a gas supply passage extending therethrough.
  • the sealing means is a graphoil seal.
  • the insert is threadedly engaged with the carrier element.
  • the further sealing means is a packing gland seal.
  • the insert is threadedly engaged with the stopper rod body.
  • the further sealing means is a graphoil seal, which is preferably thicker than the graphoil seal forming said sealing means.
  • the insert is threadedly engaged with a ceramic insert which is preferably pressed into the stopper rod to form part thereof.
  • the sealing means is disposed between complementary frustoconical surfaces respectively of the enlarged portion of the carrier element and said seating surface. Until the stopper rod heats up, the sealing means is compressed between the carrier element and the stopper rod body and provides a gas-tight seal therebetween. As the stopper rod heats up, gas tightness is maintained by the further sealing means, even if the seal provided by the sealing means starts to leak due to the expansion of the metal carrier element.
  • the insert is engaged with a complementary thread on the carrier element.
  • the insert is screwed down tightly on the further sealing means to effect radial sealing to the inner annular wall of the passageway of the stopper rod body.
  • the whole assembly simply slides up fractionally, but the force on the further sealing means, and hence the gas-tightness, is maintained.
  • the insert is a collar, which can be metallic or ceramic, threadedly engaged with a corresponding thread at an upper inner surface of the internal passageway in the stopper rod body.
  • the thread can be pressed in the stopper rod body passageway, or provided by a pressed-in ceramic insert forming part of the stopper rod body.
  • the insert is in the form of a nut screw-threadedly engaged on the carrier element, which nut, when tightened, effects axial compression of said further sealing means, resulting in sealing between the stopper rod body and the carrier element.
  • the nut preferably effects axial compression of said further sealing means through the intermediary of a washer.
  • the washer is located around the carrier element at one end of the stopper rod body.
  • the washer is larger than the further sealing means, and particularly of larger diameter than the diameter of the upper end of the internal passageway in the stopper rod body, in which upper end the further sealing means is received.
  • the further sealing means is preferably two graphoil seals which stand proud of said upper end of the stopper rod body when the nut is untightened, and are axially compressed into said upper end of the passageway when the nut is tightened onto the washer to cause the washer axially to compress the graphoil seals.
  • FIG. 2 The embodiment of the present invention shown in Figure 2 is designed to solve that problem.
  • all the features of the stopper rod shown in Figure 1 are present in Figure 2 and have accordingly been numbered identically, but with the suffix a.
  • an insert in the form of a nut 20 is threadedly engaged on the carrier rod 15a at a position somewhat above the upwardly facing surface of the cylindrical part 17 of the collar 16 so that, as shown, the upper face of the nut 20 is substantially flush with the upper face of the stopper rod body 11.
  • sealing means in the form, for example, of a packing gland seal 21 Between the lower end of the nut 20 and the upper surface of the cylindrical part 17 of the collar 16 is sealing means in the form, for example, of a packing gland seal 21.
  • this seal 21 would be compressed by the screwing down of the nut 20, even when the stopper rod is not heated, so that there some radial sealing as shown by the arrows at the seal 21 in Figure 2 . Accordingly instead of the bore 12 being open at above the collar 16 as in Figure 1 , this part of the bore 12 now receives the nut 20 and seal 21 as shown.
  • the stopper rod shown in Figure 3 comprises a refractory/ceramic stopper rod body 11b with a longitudinal bore 12b extending therethrough from its open upper end.
  • This upper laterally (radially) enlarged part of the bore 12b is formed with a seating surface 13b of frustoconical form, and spaced below this surface 13b there is pressed into the material of the body 11 a fixing insert 14b with which an externally threaded end of the metallic carrier rod 15b is engaged so that a lifting or lowering of the carrier rod will result in a corresponding lifting or lowering of the stopper rod in its vessel.
  • the carrier rod 15b which is preferably metallic, has a central gas passage 22 extending therethrough. It is provided externally with a collar 16b made up of an upper cylindrical part 17b and a lower part which has a frustoconical undersurface 18b. As with the Figure 2 arrangement, a seal 19b, preferably a graphoil seal, is trapped between the frustoconical surface 18b and the seating surface 13b to provide a gas tight seal when the stopper rod is unheated.
  • a seal 19b preferably a graphoil seal
  • a screw thread 23 is provided, for example by pressing, into the inner surface of the upper part of the bore 12b and an insert in the form of an annular collar 24 or equivalent is screw-threadedly engaged with the thread 23, there being, as shown, radial clearance between the inner cylindrical surface of the collar and the outer cylindrical surface of the carrier rod 15b.
  • This is in contrast to the Figure 2 arrangement, where this radial clearance can be provided between the external surface of the nut 20 and the inner cylindrical surface of the bore in which the nut is received.
  • the collar 24 is screwed down onto the seal 25 which is compressed thereby. Accordingly when the stopper rod is unheated, there is sealing both by way of the seal 19b and also by way of the seal 25, both of which seals are under compression. However as the stopper rod is heated, and the carrier rod 15b expands, the seal 19b is likely to start to leak in the normal manner as the compression thereof decreases due to the expansion of the carrier rod 15b. However the upper seal 25, which is restrained by the fixed screwed-in collar 24, will be subject to additional compressive forces between the expanding carrier rod 15b and the retained collar 24 to provide an effective gas-tight seal.
  • Figure 3 shows a conventional washer 26 on the carrier rod 15b at the top of the stopper rod body 11b, this washer being held down onto the top of the stopper rod body by a nut 27 which is screw threaded onto the carrier rod 15b, the washer and nut providing a conventional lock at the top of the stopper rod body.
  • the stopper rod of the invention shown in Figure 5 is similar in several respects to that shown in Figure 3 , having a stopper rod body 11c of refractory/ceramic material with a central, longitudinally extending circular cross-section bore 12c, which is open at the end of the stopper rod which is uppermost in use.
  • This upper laterally (radially) enlarged part of the bore 12c is formed with a seating surface 13c of frustoconical form, and spaced below this surface there is pressed into the material of the body 11c a (ceramic) fixing insert 14c with which an externally threaded end of the preferably metallic carrier element in the form of a rod 15c is engaged, so that a lifting or lowering of the carrier rod will result in a corresponding lifting or lowering of the stopper rod in its vessel.
  • the carrier rod 15c has a central gas passageway through it. It has an external collar 16c made up of an upper cylindrical part 17c and a lower part with a frustoconical undersurface 18c. A seal 19c, preferably a graphoil seal, is trapped between the surface 18c and the seating surface 13c to provide a gas tight seal when the stopper rod is unheated.
  • a conventional washer 26c is received on the carrier element, as with the Figure 3 embodiment, with a conventional insert in the form of a nut 27c, also as in the Figure 3 embodiment, being engaged on the screw thread 28, to force the washer downwardly when the nut is tightened.
  • the washer is of a diameter much greater than that of the bore 12c at the top of the stopper rod body.
  • the washer could be sized to be received in the upper end of bore 12c and thus at least partly received therein when it axially compresses the seals 25a, 25b.
  • the insert screw-threaded on the carrier rod, such as nut 27c could also at least partly be received in the bore 12c pressing down on the washer.
  • the further sealing means could, in any embodiment, be a single seal or any suitable number of seals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Lift Valve (AREA)
  • Coating Apparatus (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (25)

  1. Stopfenstange, die aufweist: einen Stopfenstangenkörper (11a; 11b; 11c) aus feuerfestem Material mit einem inneren Durchgang (12b; 12c), der sich von einem ersten Ende des Körpers (11a; 11b; 11c) in Richtung eines zweiten Endes davon erstreckt; ein Metallträgerelement (15a; 15b; 15c), bei dem eines seiner Enden im Durchgang (12b; 12c) aufgenommen wird, wobei das Trägerelement (15a; 15b; 15c) einen seitlich vergrößerten Abschnitt aufweist, der in einem seitlich vergrößerten Abschnitt des Durchganges aufgenommen wird, wobei der Durchgangsabschnitt eine Sitzfläche definiert; und Dichtungsmittel (19a; 19b; 19c) zwischen der Sitzfläche und einer Unterseite des seitlich vergrößerten Abschnittes des Trägerelementes (15a; 15b; 15c), wobei ein Einsatz (20; 24; 27c) verschraubbar mit einem von Trägerelement (15a; 15b; 15c) und Stopfenstangenkörper (11a; 11b; 11c) in einer Position oberhalb des seitlich vergrößerten Abschnittes des Trägerelementes (15a; 15b; 15c) in Eingriff gebracht wird, wobei weitere Dichtungsmittel (21; 25; 25a, 25b) axial zwischen dem Einsatz (20; 24; 27c) und dem Trägerelement (15a; 15b; 15c) angeordnet sind, so dass das axiale Zusammendrücken der weiteren Dichtungsmittel (21; 25; 25a, 25b) eine radiale Abdichtung zwischen dem Trägerelement (15a; 15b; 15c) und dem Stopfenstangenkörper (11a; 11b; 11c) bewirkt.
  2. Stopfenstange nach Anspruch 1, bei der der Einsatz in der Form einer Mutter (20; 27c) vorliegt, die mittels Schraubengewinde am Trägerelement (15a; 15c) in Eingriff gebracht wird, wobei die Mutter, wenn sie angezogen wird, ein axiales Zusammendrücken der weiteren Dichtungsmittel bewirkt, was zu einer Abdichtung zwischen dem Stopfenstangenkörper und dem Trägerelement führt.
  3. Stopfenstange nach Anspruch 2, bei der die Mutter (27c) ein axiales Zusammendrücken der weiteren Dichtungsmittel (25a, 25b) mittels einer Unterlegscheibe (26c) bewirkt.
  4. Stopfenstange nach Anspruch 3, bei der die Unterlegscheibe (26c) um das Trägerelement (5c) an einem Ende des Stopfenstangenkörpers (11c) herum angeordnet ist.
  5. Stopfenstange nach Anspruch 3 oder Anspruch 4, bei der die Unterlegscheibe (26c) größer ist als die weiteren Dichtungsmittel (25a, 25b).
  6. Stopfenstange nach Anspruch 5, bei der die Unterlegscheibe (26c) einen größeren Durchmesser aufweist als der Durchmesser des oberen Endes des inneren Durchganges (12c) im Stopfenstangenkörper (11c), in dem das obere Ende der weiteren Dichtungsmittel aufgenommen wird.
  7. Stopfenstange nach einem der Ansprüche 3 bis 6, bei der die weiteren Dichtungsmittel (25a, 25b) zwei Grafoil-Dichtungen sind, die aus dem oberen Ende des Stopfenstangenkörpers (11c) hervorstehen, wenn die Mutter (27c) nicht angezogen ist, und die axial in das obere Ende des Durchganges gepresst werden, wenn die Mutter (27c) auf der Unterlegscheibe (26c) angezogen wird, um zu bewirken, dass die Unterlegscheibe (26c) die Grafoil-Dichtungen axial zusammendrückt.
  8. Stopfenstange nach einem der Ansprüche 1 bis 7, bei der die weiteren Dichtungsmittel drei separate Grafoil-Dichtungen aufweisen.
  9. Stopfenstange nach einem der Ansprüche 1 bis 8, bei der das Trägerelement (15a; 15b; 15c), das dazu dient, bei Benutzung die Stopfenstange mit einer Hebevorrichtung zu verbinden, eine Gasversorgung aufweist, die sich dort hindurch erstreckt.
  10. Stopfenstange nach einem der Ansprüche 1 bis 9, bei der die Dichtungsmittel (19a; 19b; 19c) eine Grafoil-Dichtung sind.
  11. Stopfenstange nach Anspruch 1, bei der der Einsatz (20; 27c) verschraubbar mit dem Trägerelement (15a; 15c) in Eingriff gebracht wird.
  12. Stopfenstange nach Anspruch 11, bei der das weitere Dichtungsmittel (21) eine Packungsstopfbuchsendichtung ist.
  13. Stopfenstange nach Anspruch 1, bei der der Einsatz (24) verschraubbar mit dem Stopfenstangenkörper in Eingriff gebracht wird.
  14. Stopfenstange nach Anspruch 13, bei der das weitere Dichtungsmittel (25) eine Grafoil-Dichtung ist.
  15. Stopfenstange nach Anspruch 14, bei der die Grafoil-Dichtung dicker ist als die Dichtung, die das Dichtungsmittel bildet.
  16. Stopfenstange nach Anspruch 1, bei der der Einsatz (24) verschraubbar mit einem keramischen Einsatz (28) in Eingriff gebracht wird.
  17. Stopfenstange nach Anspruch 16, bei der der keramische Einsatz (28) in die Stopfenstange gepresst wird, um einen Teil davon zu bilden.
  18. Stopfenstange nach einem der Ansprüche 1 bis 17, bei der die Dichtungsmittel (19a; 19b; 19c) zwischen komplementären kegelstumpfförmigen Flächen von jeweils dem vergrößerten Abschnitt des Trägerelementes und der Sitzfläche angeordnet werden.
  19. Stopfenstange nach Anspruch 18, bei der, bis sich die Stopfenstange erhitzt hat, die Dichtungsmittel (19a; 19b; 19c) zwischen dem Trägerelement und dem Stopfenstangenkörper zusammengepresst werden und eine gasundurchlässige Dichtung dazwischen bereitstellen.
  20. Stopfenstange nach Anspruch 11, bei der der Einsatz (20; 27c) mit einem komplementären Gewinde auf dem Trägerelement (15a; 15c) in Eingriff gebracht wird.
  21. Stopfenstange nach Anspruch 20, bei der der Einsatz (20; 27c) fest nach unten auf die weiteren Dichtungsmittel (25; 25a, 25b) geschraubt wird, um ein radiales Abdichten an der inneren ringförmigen Wand des Durchganges des Stopfenstangenkörpers zu bewirken.
  22. Stopfenstange nach Anspruch 13, bei der der Einsatz (24) ein Ring ist.
  23. Stopfenstange nach Anspruch 22, bei der der Ring metallisch oder keramisch ist, wobei er verschraubbar mit einem entsprechenden Gewinde (23a) an einer oberen Innenfläche des inneren Durchganges im Stopfenstangenkörper in Eingriff gebracht wird.
  24. Stopfenstange nach Anspruch 23, bei der das Gewinde (23a) in den Durchgang des Stopfenstangenkörpers gepresst wird.
  25. Stopfenstange nach Anspruch 24, bei der das Gewinde mittels eines eingepressten Einsatzes (28) bereitgestellt wird, der einen Teil des Stopfenstangenkörpers bildet.
EP06744052A 2005-06-02 2006-06-01 Stopfenstange Active EP1885516B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0511202A GB0511202D0 (en) 2005-06-02 2005-06-02 Stopper rod
GB0523894A GB0523894D0 (en) 2005-11-24 2005-11-24 Stopper rod
PCT/GB2006/001991 WO2006129091A2 (en) 2005-06-02 2006-06-01 Stopper rod

Publications (2)

Publication Number Publication Date
EP1885516A2 EP1885516A2 (de) 2008-02-13
EP1885516B1 true EP1885516B1 (de) 2011-03-02

Family

ID=37027483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06744052A Active EP1885516B1 (de) 2005-06-02 2006-06-01 Stopfenstange

Country Status (15)

Country Link
US (1) US20090152778A1 (de)
EP (1) EP1885516B1 (de)
JP (1) JP2008542032A (de)
KR (1) KR20080016723A (de)
AR (1) AR055963A1 (de)
AT (1) ATE500012T1 (de)
AU (1) AU2006253947A1 (de)
BR (1) BRPI0610966A2 (de)
CA (1) CA2610580A1 (de)
DE (1) DE602006020436D1 (de)
EA (1) EA200702645A1 (de)
MX (1) MX2007015023A (de)
TN (1) TNSN07451A1 (de)
TW (1) TW200709873A (de)
WO (1) WO2006129091A2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5022054B2 (ja) * 2007-02-07 2012-09-12 黒崎播磨株式会社 ストッパー構造体およびその製造方法
KR100925440B1 (ko) 2008-01-28 2009-11-06 엘지전자 주식회사 물리 하이브리드 ａｒｑ 지시 채널 할당 방법
JP5107127B2 (ja) * 2008-04-23 2012-12-26 助川電気工業株式会社 溶融金属用電磁ポンプ
KR101482071B1 (ko) * 2014-09-03 2015-01-14 주식회사 영진이엠티 스토퍼 로드
KR101584135B1 (ko) 2015-07-09 2016-01-11 신일인텍 주식회사 스토퍼 로드

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946083A (en) * 1988-12-29 1990-08-07 Vesuvius Crucible Company One-piece stopper rod
DE4040189C1 (en) * 1990-12-15 1992-01-02 Didier-Werke Ag, 6200 Wiesbaden, De Ceramic plug for outlet from metallurgical vessel - has supporting pipe with annular space to form sealing face, and nut is screwed onto it through which gas is delivered
DE9109532U1 (de) * 1991-08-01 1991-10-10 Radex-Heraklith Industriebeteiligungs AG, Wien Gasblasender Stopfen
DE9109536U1 (de) 1991-08-01 1991-09-26 Kissner, Walter, 6000 Frankfurt Schultertasche

Also Published As

Publication number Publication date
CA2610580A1 (en) 2006-12-07
EA200702645A1 (ru) 2008-04-28
KR20080016723A (ko) 2008-02-21
US20090152778A1 (en) 2009-06-18
WO2006129091A3 (en) 2007-01-18
EP1885516A2 (de) 2008-02-13
DE602006020436D1 (de) 2011-04-14
BRPI0610966A2 (pt) 2019-05-14
TW200709873A (en) 2007-03-16
JP2008542032A (ja) 2008-11-27
MX2007015023A (es) 2008-02-07
AR055963A1 (es) 2007-09-12
ATE500012T1 (de) 2011-03-15
TNSN07451A1 (en) 2009-03-17
WO2006129091A2 (en) 2006-12-07
AU2006253947A1 (en) 2006-12-07

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