EP0198123A1 - Method of sealing junction canals for liquid metal and canals sealed by using this method - Google Patents
Method of sealing junction canals for liquid metal and canals sealed by using this method Download PDFInfo
- Publication number
- EP0198123A1 EP0198123A1 EP85200556A EP85200556A EP0198123A1 EP 0198123 A1 EP0198123 A1 EP 0198123A1 EP 85200556 A EP85200556 A EP 85200556A EP 85200556 A EP85200556 A EP 85200556A EP 0198123 A1 EP0198123 A1 EP 0198123A1
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- EP
- European Patent Office
- Prior art keywords
- seal
- sheet
- nozzle
- space
- canals
- 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.)
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- 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
- B22D41/50—Pouring-nozzles
- B22D41/502—Connection arrangements; Sealing means therefor
Definitions
- the present invention relates to a method for making airtight a space existing between a container and a metallurgical pipe, such as space between, on the one hand, the intermediate external nozzle of a closure device ensuring control liquid metal casting either from a steelworks ladle, or from a continuous casting distributor, and, on the other hand, a pipe such as a long nozzle or a submerged nozzle.
- Metallurgical vessels in particular steelworks pouring ladles and continuous casting distributors, are fitted with an internal or external closing device which controls the pouring of liquid metal and which is generally filled with a material refractory channeling said liquid metal, allowing either to adjust the speed of casting, or to stop the casting.
- These closing devices comprise an intermediate external nozzle through which the liquid metal flows and whose length varies between 100 and 500 mm and whose shape is generally substantially cylindrical.
- the molten metal is channeled from the free end of the intermediate external nozzle.
- a nozzle which is called “long nozzle” when it is disposed between the ladle and the continuous casting distributor, "immersed nozzle” when it is mounted between the continuous casting distributor and the false ingot mold .
- the known manner also has the disadvantage that, during casting, the liquid metal deteriorates the nozzles at the location of the seal and particularly in the case where the intermediate external nozzle is coated with a metal jacket, the liquid metal attacks this coating, so that generally the intermediate external nozzle and long or submerged nozzle must be replaced after each pouring, which requires in particular the long and tedious disassembly of the aforementioned closing device.
- the object of the invention is to remedy these drawbacks and to provide a method making it possible to seal the abovementioned seal simply and reliably, which has the advantage, on the one hand, of allowing the use of the same nozzles for several castings, which appreciably reduces operating costs and, on the other hand, allows a significant or total reduction in the consumption of neutral gas to render the environment of the seal inert, which also contributes to lowering, notably, said operating costs.
- a carbon gasket is used which is in the form of a sheet, this gasket being advantageously cut flat and shaped either manually or by stamping.
- the above sheet is reinforced, the frame being for example a metallic frame, such as a stainless steel frame.
- pure crystalline graphite fibers are used as carbon.
- the invention also relates to metallurgical vessels and pipes, the seal of which is made leaktight by the above method.
- the process according to the invention and illustrated in the drawings is intended to make airtight the spaces 1 existing between, on the one hand, the intermediate external nozzles 2, made of refractory material, closing devices 3 ensuring the control of the pouring of liquid air from a steelworks ladle 4 and a continuous casting distributor 5 and, on the other hand, the immersed nozzles 6, made of refractory material, connected to the intermediate external nozzles 2, and coated ( Figure 1) or not ( Figure 2 ) of sheet metal shirts 7.
- the spaces 1 are closed using a carbon joint 8, which is in the form of a sheet made from fibers of pure crystalline graphite.
- This seal 8 which has a very good air tightness, is easily compressible so that it can marry all the irregularities of the nozzles 2 and 6 at the location of the fittings and thus ensure an excellent seal of the seal.
- carbon has the advantage of being very refractory (up to about 2500 ° C), withstands very well the attack of liquid steel (1500 to 1650 ° C) and the high temperature environment , which provides excellent resistance over time to the gasket 8.
- the carbon offers good mechanical strength, so that the gasket 8, on the one hand, is little affected by the mechanical shocks and vibrations occurring during handling and when using the nozzles 2 and 6 and, on the other hand, therefore, keeps well and keeps good stability during casting.
- the thermal conductivity of the carbon gasket 8 is high, which favors the evacuation of calories to the cooler areas than that of the gasket, which has the effect of cooling the nozzles 2 and 6 at the place of their connection and of cause solidification of the liquid steel before it infiltrates into the spaces l, which is generally the case when the latter are clogged according to known methods.
- This feature of the seal 8 offers the advantage of slowing down the deterioration of the surfaces in contact at the location of the connector and in particular the deterioration of the metal jacket 7, in the case where the latter is provided, of the intermediate external nozzle 2, this which recycles the nozzles 2 and 6 for several flows while retaining a good seal.
- the carbon constituting the aforementioned joint 8 is not very wettable by liquid air, which avoids, unlike known techniques, bonding between the nozzles 2 and 6, so that these can be separated extremely easily at the end of the process. use of said nozzles and when replacing them.
- seal 8 having regard to its aforementioned qualities, therefore makes it possible to significantly reduce and even to eliminate the aforesaid injection of neutral gas in the areas of the fittings.
- the seal 8 can be used both for a connection as illustrated in FIG. 1, namely a connection whose surfaces are in the form of a truncated cone, as for a connection shown in FIG. 2 and whose surfaces are horizontal and joined by a truncated cone-shaped surface.
- the sheet used to make the seal 8 advantageously has a thickness of between 0.5 and 5 mm.
- the joint illustrated in Figure 1 is cut flat in this sheet and it is deformed manually to give it the appropriate shape. It can either be placed freely at the location of the connection of the nozzles 2 and 6, or stuck on one or the other of the nozzles.
- the seal 8, illustrated in FIG. 2 is also cut flat in the sheet and then stamped to give it its shape.
- the carbon sheet can be used as it is, but a sheet reinforced with a metallic frame, such as a frame made of stainless steel, is advantageously used.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
La présente invention a pour objet un procédé pour rendre étanche à l'air un espace existant entre un récipient et une canalisation métallurgiques, tel qu'espace entre, d'une part, la busette externe intermédiaire d'un dispositif de fermeture assurant le contrôle de la coulée du métal liquide soit d'une poche de coulée d'aciérie, soit d'un répartiteur de coulée continue, et, d'autre part, une canalisation telle que busette longue ou busette immergée.The present invention relates to a method for making airtight a space existing between a container and a metallurgical pipe, such as space between, on the one hand, the intermediate external nozzle of a closure device ensuring control liquid metal casting either from a steelworks ladle, or from a continuous casting distributor, and, on the other hand, a pipe such as a long nozzle or a submerged nozzle.
Les récipients métallurgiques, en particulier les poches de coulée d'aciérie et les répartiteurs de coulée continue, sont équipés d'un dispositif de fermeture interne ou externe qui assure le contrôle de la coulée du métal liquide et qui est généralement garni d'un matériau réfractaire canalisant ledit métal liquide, permettant soit d'ajuster la vitesse de coulée, soit d'interrompre la coulée.Metallurgical vessels, in particular steelworks pouring ladles and continuous casting distributors, are fitted with an internal or external closing device which controls the pouring of liquid metal and which is generally filled with a material refractory channeling said liquid metal, allowing either to adjust the speed of casting, or to stop the casting.
Ces dispositifs de fermeture comprennent une busette externe intermédiaire par laquelle s'écoule le métal liquide et dont la longueur varie entre 100 et 500 mm et dont la forme est en général sensiblement cylindrique.These closing devices comprise an intermediate external nozzle through which the liquid metal flows and whose length varies between 100 and 500 mm and whose shape is generally substantially cylindrical.
On sait que quand le métal liquide est en contact avec l'air ambiant, ledit métal et les éventuels additifs et gaz contenus dans ce dernier s'altèrent par oxydation ou tout autre réaction physico-chimique.It is known that when the liquid metal is in contact with the ambient air, said metal and the possible additives and gases contained in the latter deteriorate by oxidation or any other physicochemical reaction.
Pour éviter ces altérations, on canalise le métal en fusion, depuis l'extrémité libre de la busette externe intermédiaire, dans une busette que l'on nomme " busette longue" lorsqu'elle est disposée entre la poche de coulée et le répartiteur de coulée continue, "busette immergée" lorsqu'elle est montée entre le répartiteur de coulée continue et la fausse lingotière.To avoid these alterations, the molten metal is channeled from the free end of the intermediate external nozzle. re, in a nozzle which is called "long nozzle" when it is disposed between the ladle and the continuous casting distributor, "immersed nozzle" when it is mounted between the continuous casting distributor and the false ingot mold .
Cette façon de faire ne solutionne qu'une partie du problème car il est très difficile de rendre étanche à l'air le joint existant entre la busette longue ou immergée et la busette externe intermédiaire.This approach solves only part of the problem because it is very difficult to make airtight the seal existing between the long or submerged nozzle and the intermediate external nozzle.
Comme cette busette longue ou immergée est normalement amovible et maintenue, pour la coulée, par un mécanisme spécialement adapté et comme la busette externe intermédiaire est souvent munie d'une chemise métallique en tôle, il n'est pas possible de fermer complètement le joint existant entre ces deux pièces par simple emboîtement de celles-ci. En effet, ces pièces qui présentent certaines irrégularités dues à leur fabrication et à leur nature (réfractaire - chemise métallique) ne peuvent pas s'épouser parfaitement pour rendre le joint pratiquement étanche. C'est pourquoi, jusqu'à présent, on est amené, d'une part, à colmater manuellement le joint, pour le rendre plus ou moins étanche, soit à l'aide d'un matériau réfractaire fibreux, soit à l'aide d'un mortier réfractaire et, d'autre part, puisque l'étanchéité n'est pas parfaite, à injecter un gaz neutre dans la zone du joint pour rendre inerte l'environnement de cette zone.As this long or submerged nozzle is normally removable and held, for casting, by a specially adapted mechanism and as the intermediate external nozzle is often provided with a metal sheet jacket, it is not possible to completely close the existing seal between these two parts by simple interlocking thereof. Indeed, these parts which have certain irregularities due to their manufacture and to their nature (refractory - metal jacket) cannot marry perfectly to make the joint practically sealed. This is why, until now, we have had, on the one hand, to manually seal the joint, to make it more or less waterproof, either using a fibrous refractory material, or using of a refractory mortar and, on the other hand, since the sealing is not perfect, injecting a neutral gas into the zone of the joint to render the environment of this zone inert.
Outre l'inconvénient résultant du manque d'étanchéité du joint dû à son colmatage manuel qui dans pratiquement tous les cas est imparfait et l'inconvénient résultant de l'obligation d'injecter de grandes quantités de gaz inerte onéreux dans la zone susdite, la façon de faire connue présente également l'inconvénient que, lors de la coulée, le métal liquide détériore les busettes à l'endroit du joint et particulièrement dans le cas où la busette externe intermédiaire est revêtue d'une chemise métallique, le métal liquide attaque ce revêtement, de sorte que généralement les busette externe intermédiaire et busette longue ou immergée doivent être remplacées après chaque coulée, ce qui nécessite notamment le démontage long et fastidieux du dispositif de fermeture précité.In addition to the disadvantage resulting from the lack of tightness of the joint due to its manual clogging which in practically all cases is imperfect and the disadvantage resulting from the obligation to inject large quantities of expensive inert gas into the aforementioned zone, the known manner also has the disadvantage that, during casting, the liquid metal deteriorates the nozzles at the location of the seal and particularly in the case where the intermediate external nozzle is coated with a metal jacket, the liquid metal attacks this coating, so that generally the intermediate external nozzle and long or submerged nozzle must be replaced after each pouring, which requires in particular the long and tedious disassembly of the aforementioned closing device.
L'invention a pour but de remédier à ces inconvénients et de procurer un procédé permettant de rendre étanche le joint précité de manière simple et fiable, ce qui a notamment pour avantage, d'une part, de permettre l'utilisation des mêmes busettes pour plusieurs coulées, ce qui réduit de manière appréciable les coûts d'exploitation et, d'autre part, de permettre la réduction importante ou totale de la consommation de gaz neutre pour rendre inerte l'environnement du joint, ce qui contribue également à abaisser, de façon notable, lesdits coûts d'exploitation.The object of the invention is to remedy these drawbacks and to provide a method making it possible to seal the abovementioned seal simply and reliably, which has the advantage, on the one hand, of allowing the use of the same nozzles for several castings, which appreciably reduces operating costs and, on the other hand, allows a significant or total reduction in the consumption of neutral gas to render the environment of the seal inert, which also contributes to lowering, notably, said operating costs.
A cet effet, suivant l'invention, on introduit dans le joint précité un joint étanche en carbone.To this end, according to the invention, a carbon tight seal is introduced into the above-mentioned seal.
Suivant une forme de réalisation de l'invention, on utilise un joint en carbone se présentant sous forme de feuille, ce joint étant avantageusement découpé à plat et mis en forme soit manuellement, soit par emboutissage.According to one embodiment of the invention, a carbon gasket is used which is in the form of a sheet, this gasket being advantageously cut flat and shaped either manually or by stamping.
Suivant un mode de réalisation avantageux de l'invention, la feuille susdite est armée, l'armature étant par exemple une trame métallique, telle que trame en acier inoxydable.According to an advantageous embodiment of the invention, the above sheet is reinforced, the frame being for example a metallic frame, such as a stainless steel frame.
Suivant une forme de réalisation particulièrement avantageuse de l'invention, on utilise, comme carbone, des fibres de graphite pur cristallin.According to a particularly advantageous embodiment of the invention, pure crystalline graphite fibers are used as carbon.
L'invention a également pour objet des récipients et canalisations métallurgiques dont le joint est rendu étanche grâce au procédé susdit.The invention also relates to metallurgical vessels and pipes, the seal of which is made leaktight by the above method.
D'autres détails et particularités de l'invention ressortiront de la description des dessins annexés au présent mémoire et qui illustrent, à titre d'exemples non limitatifs, deux variantes du procédé suivant l'invention.
- La figure 1 est une vue schématique, en coupe et avec brisures partielles, montrant une installation de coulée continue dans laquelle les joints entre récipients et canalisations ont été rendus étanches grâce au procédé suivant l'invention.
- La figure 2 est une vue analogue à la figure 1, montrant une variante du joint illustré à ladite figure 1.
- Figure 1 is a schematic view, in section and with partial fractures, showing a continuous casting installation in which the joints between containers and pipes have been sealed using the method according to the invention.
- FIG. 2 is a view similar to FIG. 1, showing a variant of the seal illustrated in said FIG. 1.
Dans les différentes figures, les mêmes notations de référence désignent des éléments identiques ou analogues.In the different figures, the same reference notations designate identical or analogous elements.
Le procédé suivant l'invention et illustré aux dessins est destiné à rendre étanches à l'air les espaces 1 existant entre, d'une part, les busettes externes intermédiaires 2, en matériau réfractaire, des dispositifs de fermeture 3 assurant le contrôle de la coulée de l'air liquide d'une poche de coulée d'aciérie 4 et d'un répartiteur de coulée continue 5 et, d'autre part, les busettes immergées 6, en matériau réfractaire, raccordées aux busettes externes intermédiaires 2, et revêtues (figure 1) ou non (figure 2) de chemises métalliques 7 en tôle.The process according to the invention and illustrated in the drawings is intended to make airtight the spaces 1 existing between, on the one hand, the intermediate
L'obturation des espaces 1 est réalisée à l'aide d'un joint 8 en carbone, qui se présente sous la forme d'une feuille fabriquée à partir de fibres de graphite pur cristallin. Ce joint 8, qui possède une très bonne étanchéité à l'air, est facilement compressible de sorte qu'il peut épouser toutes les irrégularités des busettes 2 et 6 à l'endroit des raccords et assurer ainsi une excellente étanchéité du joint.The spaces 1 are closed using a
De plus, le carbone a l'avantage d'être très réfractaire (jusqu'à environ 2500°C), résiste très bien à l'attaque de l'acier liquide (1500 à 1650°C) et à l'environnement haute température, ce qui assure une excellente résistance dans le temps du joint 8. En outre, le carbone offre une bonne résistance mécanique, de sorte que le joint 8, d'une part, est peu altéré par les chocs mécaniques et les vibrations se produisant lors des manipulations et lors de l'utilisation des busettes 2 et 6 et, d'autre part, par conséquent, se conserve bien et garde une bonne stabilité pendant la coulée.In addition, carbon has the advantage of being very refractory (up to about 2500 ° C), withstands very well the attack of liquid steel (1500 to 1650 ° C) and the high temperature environment , which provides excellent resistance over time to the
La conductibilité thermique du joint 8 en carbone est élevée, ce qui favorise l'évacuation des calories vers les zones plus froides que celle du joint, ce qui a pour effet de refroidir les busettes 2 et 6 à l'endroit de leur raccord et de provoquer la solidification de l'acier liquide avant que celui-ci s'infiltre dans les espaces l, ce qui est généralement le cas lorsque ces derniers sont colmatés suivant les procédés connus. Cette particularité du joint 8 offre l'avantage de ralentir la détérioration des surfaces en contact à l'endroit du raccord et notamment la détérioration de la chemise métallique 7, dans le cas où cette dernière est prévue, de la busette externe intermédiaire 2, ce qui permet de recycler les busettes 2 et 6 pour plusieurs coulées tout en conservant une bonne étanchéité.The thermal conductivity of the
Enfin, le carbone constituant le joint 8 susdit est peu mouillable par l'air liquide, ce qui évite, contrairement aux techniques connues, les collages entre les busettes 2 et 6, de sorte que celles-ci peuvent être séparées extrêmement facilement en fin d'utilisation desdites busettes et lors du remplacement de ces dernières.Finally, the carbon constituting the
L'utilisation du joint 8 suivant l'invention, vu ses qualités précitées, permet donc de réduire de manière sensible et même de supprimer l'injection susdite de gaz neutre dans les zones des raccords.The use of the
Le joint 8 peut être utilisé aussi bien pour un raccord tel qu'illustré à la figure 1, à savoir raccord dont les surfaces sont en forme de tronc de cône, que pour un raccord montré à la figure 2 et dont les surfaces sont horizontales et réunies par une surface en forme de tronc de cône.The
La feuille utilisée pour réaliser le joint 8 a avantageusement une épaisseur comprise entre 0,5 et 5 mm. Le joint illustré à la figure 1 est découpé à plat dans cette feuille et il est déformé manuellement pour lui donner la forme appropriée. II peut être soit placé librement à l'endroit du raccord des busettes 2 et 6, soit collé sur l'une ou l'autre des busettes. Le joint 8, illustré à la figure 2, est également découpé à plat dans la feuille et embouti ensuite pour lui donner sa forme.The sheet used to make the
La feuille de carbone peut être utilisée telle quelle, mais on utilisera avantageusement une feuille armée notamment par une trame métallique, telle qu'une trame réalisée en acier inoxydable.The carbon sheet can be used as it is, but a sheet reinforced with a metallic frame, such as a frame made of stainless steel, is advantageously used.
Il doit être entendu que l'invention n'est nullement limitée aux formes de réalisation décrites et que bien des modifications peuvent être apportées à ces dernières, sans sortir du cadre du présent brevet.It should be understood that the invention is in no way limited to the embodiments described and that many modifications can be made to the latter, without departing from the scope of this patent.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP85200556A EP0198123A1 (en) | 1985-04-11 | 1985-04-11 | Method of sealing junction canals for liquid metal and canals sealed by using this method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP85200556A EP0198123A1 (en) | 1985-04-11 | 1985-04-11 | Method of sealing junction canals for liquid metal and canals sealed by using this method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0198123A1 true EP0198123A1 (en) | 1986-10-22 |
Family
ID=8194007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85200556A Withdrawn EP0198123A1 (en) | 1985-04-11 | 1985-04-11 | Method of sealing junction canals for liquid metal and canals sealed by using this method |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0198123A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0282247A1 (en) * | 1987-03-06 | 1988-09-14 | Thor Ceramics Limited | Refractory assemblies |
| FR2635283A1 (en) * | 1988-08-11 | 1990-02-16 | Flo Con Syst | PROTECTIVE TUBE SEAL FOR MELTING METAL CASTING |
| FR2684577A1 (en) * | 1991-12-04 | 1993-06-11 | Daussan & Co | Runner (casting tube) with refractory sleeve |
| US5348202A (en) * | 1987-02-28 | 1994-09-20 | Thor Ceramics Limited | Tubular refractory product |
| US5866022A (en) * | 1997-03-24 | 1999-02-02 | North American Refractories Company | Refractory pour tube with cast plate |
| 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 |
| WO2016113196A1 (en) * | 2015-01-12 | 2016-07-21 | Vesuvius Crucible Company | Casting nozzle with external resilient gasket |
| CN111922310A (en) * | 2020-07-23 | 2020-11-13 | 宝武集团马钢轨交材料科技有限公司 | A kind of continuous casting ladle long nozzle argon sealing online dynamic control device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3877675A (en) * | 1974-02-13 | 1975-04-15 | James T Shapland | Seal construction and method of forming seal between two abutting surfaces |
| US4165026A (en) * | 1971-12-07 | 1979-08-21 | Foseco Trading A.G. | Tundish with expendable lining and easily removable nozzle |
| US4177943A (en) * | 1977-07-06 | 1979-12-11 | Daishin Kako Co., Ltd. | Refractory releasing agent |
| DE2919880A1 (en) * | 1979-05-17 | 1980-11-27 | Didier Werke Ag | PIPE |
-
1985
- 1985-04-11 EP EP85200556A patent/EP0198123A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4165026A (en) * | 1971-12-07 | 1979-08-21 | Foseco Trading A.G. | Tundish with expendable lining and easily removable nozzle |
| US3877675A (en) * | 1974-02-13 | 1975-04-15 | James T Shapland | Seal construction and method of forming seal between two abutting surfaces |
| US4177943A (en) * | 1977-07-06 | 1979-12-11 | Daishin Kako Co., Ltd. | Refractory releasing agent |
| DE2919880A1 (en) * | 1979-05-17 | 1980-11-27 | Didier Werke Ag | PIPE |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5348202A (en) * | 1987-02-28 | 1994-09-20 | Thor Ceramics Limited | Tubular refractory product |
| EP0282247A1 (en) * | 1987-03-06 | 1988-09-14 | Thor Ceramics Limited | Refractory assemblies |
| FR2635283A1 (en) * | 1988-08-11 | 1990-02-16 | Flo Con Syst | PROTECTIVE TUBE SEAL FOR MELTING METAL CASTING |
| FR2684577A1 (en) * | 1991-12-04 | 1993-06-11 | Daussan & Co | Runner (casting tube) with refractory sleeve |
| US5866022A (en) * | 1997-03-24 | 1999-02-02 | North American Refractories Company | Refractory pour tube with cast plate |
| 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 |
| WO2016113196A1 (en) * | 2015-01-12 | 2016-07-21 | Vesuvius Crucible Company | Casting nozzle with external resilient gasket |
| CN111922310A (en) * | 2020-07-23 | 2020-11-13 | 宝武集团马钢轨交材料科技有限公司 | A kind of continuous casting ladle long nozzle argon sealing online dynamic control device and method |
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