WO2021106120A1 - Tube plongeur pour traitement d'acier en fusion - Google Patents

Tube plongeur pour traitement d'acier en fusion Download PDF

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Publication number
WO2021106120A1
WO2021106120A1 PCT/JP2019/046462 JP2019046462W WO2021106120A1 WO 2021106120 A1 WO2021106120 A1 WO 2021106120A1 JP 2019046462 W JP2019046462 W JP 2019046462W WO 2021106120 A1 WO2021106120 A1 WO 2021106120A1
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WO
WIPO (PCT)
Prior art keywords
brick
refractory
core metal
upper support
support
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Application number
PCT/JP2019/046462
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English (en)
Japanese (ja)
Inventor
庄吾 寺田
Original Assignee
東京窯業株式会社
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 東京窯業株式会社 filed Critical 東京窯業株式会社
Priority to PCT/JP2019/046462 priority Critical patent/WO2021106120A1/fr
Publication of WO2021106120A1 publication Critical patent/WO2021106120A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the present invention relates to an immersion pipe for molten steel processing used in a vacuum degassing device or the like.
  • a dipping pipe that distributes molten steel with the lower end immersed in the molten steel in the ladle is attached to the lower end of the vacuum degassing device and used.
  • a dipping tube as in Patent Document 1, a cylindrical core metal along a vertical axis and a meat formed by assembling a plurality of rectangular parallelepiped bricks inside the core metal in multiple stages.
  • a thick cylindrical amorphous fireproof material formed on the outer circumference of the core metal by solidifying a thick cylindrical brick layer (inner fireproof material layer) and a fluid amorphous fireproof material (castable, etc.). Those with layers are known.
  • a magnesia-carbon material is placed on the outside of the core metal.
  • Some are assembled with multiple vertically long refractory bricks.
  • a situation may occur in which the outer refractory brick is disengaged due to an outward thermal expansion stress during use. .. Therefore, some immersion pipes in which refractory bricks are assembled on the outside of the core metal are provided with locking metal fittings for locking the upper and lower ends of the outer refractory bricks (Patent Document 2).
  • Patent Document 2 in the immersion pipe in which the locking metal fitting for locking the upper end of the outer refractory brick is provided at an angle with respect to the core metal, the locking metal fitting is a splash scattered during use. It is very vulnerable to damage due to being exposed to (splashes of molten steel), being strongly affected by radiant heat, and being impacted during slag removal work (so-called slag removal). Therefore, the immersion pipe as in Patent Document 2 has a problem that the service life is short and maintenance is required frequently, so that the maintenance cost is high.
  • the immersion pipe of the type with a flange on the core metal is installed so that the molten metal surface is located near the center so that the scattered splash does not adhere to the flange, and the molten steel treatment is performed, but the core metal does not have a flange. Since there is no concern about the influence of the splash on the flange of the type (flangeless type) immersion pipe, the molten steel treatment is performed by immersing it in the molten metal deeper (immersing it until the molten metal surface is near the upper part). However, when immersed in the molten metal so deeply, the locking metal fitting for locking the upper end of the outer refractory brick is more easily damaged by the influence of splash and heat.
  • An object of the present invention is to solve the problems of the conventional immersion pipe, the locking metal fittings for locking the outer refractory bricks are not easily damaged, the service life is long, and frequent maintenance is not required. It is an object of the present invention to provide an immersion tube which can keep the maintenance cost low.
  • the invention according to claim 1 is a dipping tube for processing molten steel used as an ascending tube or a descending tube in a molten steel vacuum degassing device, which is a cylindrical iron core metal.
  • An inner refractory layer provided inside the core, a plurality of outer refractory bricks arranged in a circumferential shape on the outside of the core, and the outer refractory brick provided near the lower end of the core.
  • the upper side of the brick upper support is covered with an amorphous refractory
  • the tip of the brick upper support is covered with the outer fire resistance. It is characterized in that locking pieces for locking the side surfaces of the brick are continuously provided vertically downward, and the outer portion of the locking pieces is covered with an amorphous refractory material.
  • cement castable, low cement castable, other castables and the like can be preferably used as the amorphous refractory in the present invention.
  • the invention according to claim 2 is characterized in that, in the invention according to claim 1, a stud for preventing the amorphous refractory from falling off is provided on the upper surface of the brick upper support. It is to be.
  • the invention according to claim 3 is the invention according to claim 1 or 2, wherein the core metal is a flangeless type.
  • the brick upper support is scattered (splash). It is not exposed to the droplets of molten steel) and is not easily affected by radiant heat, etc., and the impact is not easily transmitted to the upper support during the slag removal work, so the installation part of the upper support is less likely to be damaged. Therefore, according to the immersion pipe according to claim 1, the service life can be extended and frequent maintenance is not required, so that the maintenance cost can be kept low.
  • the immersion pipe according to claim 1 is provided with an annular shape in which the upper brick support is inclined downward, thermal expansion stress that tends to diffuse in the radial direction to the outer refractory brick during use is applied. Even if it is added, the thermal expansion stress can be effectively suppressed and the outer refractory brick can be prevented from falling off.
  • the locking piece since the outer portion of the locking piece connected vertically downward to the tip of the brick upper support is covered with an amorphous refractory, the locking piece is used. Since it is not exposed to scattered splashes and is not easily affected by radiant heat or the like, the locking piece can continue to lock the side surface of the outer refractory brick. Therefore, according to the immersion pipe according to claim 3, it is possible to effectively prevent the outer refractory brick from falling off for a long period of time.
  • the amorphous refractory covering the upper side of the brick upper support is hard to fall off, so that it lasts for an extremely long period of time. It is possible to prevent damage to the installation part of the brick upper support with high accuracy.
  • the molten steel treatment can be performed in a stable state by immersing it in the molten metal deeper without damaging the locking metal fitting for locking the upper end of the outer refractory brick. It will be possible.
  • the immersion tube 1 is a so-called flangeless type in which no flange is provided on the outer periphery of the upper end, and the core metal 3, the inner refractory layer 2, the fall restraint body 10 supporting the lower ends of the inner refractory layer 2, and the core metal Inner amorphous refractory 4, metal pipe 5, outer refractory bricks 6, 6 ... forming the outer refractory layer, inner refractory layer 2 and outer, filled in the voids between 3 and the inner refractory layer 2.
  • Lower refractory 7 formed under the refractory bricks 6, 6 ..., the upper refractory support 8 that supports the upper end of the outer refractory bricks 6, 6 ..., and the lower end of the outer refractory bricks 6, 6 ... It is composed of a brick lower support 11, a horizontal reinforcing body 9 that supports the brick upper support 8, an upper refractory 15 that covers the brick upper support 8, and the like.
  • the core metal 3 is formed of a metal (steel) plate having a certain thickness (25 mm) into a cylindrical shape having a predetermined size (inner diameter 770 mm ⁇ height 800 mm).
  • the upper end surface of the core metal 3 has a tapered shape that is inclined downward.
  • a fall prevention body 10 for supporting the inner refractory layer 2 is provided in an annular shape (doughnut plate shape) having a constant width (at the lower end of the core metal 3). (Welded inside).
  • annular brick lower support 11 for supporting the outer refractory bricks 6, 6, ... Is provided.
  • the brick lower support 11 is formed in an annular shape (doughnut plate shape) having a constant width that matches the lower ends of the outer refractory bricks 6, 6, ..., And is welded to the outside near the lower end of the core metal 3.
  • the upper surface of the brick lower support 11 is located below the upper surface of the fall restraint body 10.
  • studs 12, 12, ... Formed in a V shape by steel (stainless steel) are formed on the lower end surface of the cylindrical main body of the core metal 3, the lower surface of the fall restraint body 10 and the brick lower support 11, respectively. It is attached.
  • the inner refractory layer 2 is formed by the upper refractory bricks 2a, 2a ... and the lower refractory bricks 2b, 2b ...
  • the lower refractory bricks 2b, 2b ... Are formed of a magnesia-chromic material into a vertically long square columnar having a trapezoidal horizontal cross section.
  • a cylindrical body having a predetermined thickness (outer diameter 700 mm x inner diameter 400 mm) is formed. There is.
  • the columnar body made of the upper refractory bricks 2a, 2a ... is laminated on the columnar body made of the lower refractory bricks 2b, 2b ...
  • through holes 13, 13 ... are provided alternately at predetermined intervals (every other along the circumference). It is in a state of communicating with the tip of the metal pipe 5.
  • the inner irregular shape is formed so as to fill the gap between the outer peripheral surface of the inner refractory layer 2 (that is, the upper refractory bricks 2a, 2a ... and the lower refractory bricks 2b, 2b ...) and the inner peripheral surface of the core metal 3. It is filled with refractory material (castable) 4.
  • each of the outer refractory bricks 6, 6 ... Is formed of a magnesia carbon material into a vertically long square columnar having a trapezoidal horizontal cross section.
  • An outwardly descending inclined surface is provided on the upper side of each of the outer refractory bricks 6, 6, ...,
  • an outwardly ascending inclined surface is provided on the lower side.
  • the upper inclined surface and the lower inclined surface are in a state of forming an angle of 45 ° with respect to the horizontal plane.
  • each of the outer refractory bricks 6, 6 ... Is assembled in a circumferential shape on the outside of the core metal 3 to form a cylindrical body having a predetermined thickness (outer diameter 1000 mm x inner diameter 850 mm). It has become. Further, an amorphous refractory (alumina-magnesia type) is provided so as to fill the gap between the inner surface of the outer refractory bricks 6, 6 ... It is in a filled state.
  • amorphous refractory alumina-magnesia type
  • the horizontal reinforcing body 9 is formed in an annular shape (doughnut plate shape) having a constant width and a constant thickness, and is horizontally fixed (welded) to the outside near the upper end of the core metal 3.
  • the brick upper support 8 is formed in an annular shape (outer peripheral surface of a truncated cone) in which the inclined support portion 16 is inclined outward with a constant width and a constant thickness, and is outside the inclined support portion 16. Locking pieces 17 having a constant width are continuously provided on the peripheral edge so as to project vertically downward.
  • the inclined support portion 16 is in a state of being inclined by 45 ° with respect to the horizontal plane.
  • the brick upper support 8 is fixed to the horizontal reinforcing body 9 in a state where the inner peripheral edge portion of the base end is welded to the lower surface near the base end (inner peripheral edge) of the horizontal reinforcing body 9.
  • columnar reinforcing supports 18, 18 ... Having a predetermined diameter are arranged at equal intervals (cores) in a circumferential shape so as to connect the upper surface of the brick upper support 8 and the lower surface of the horizontal reinforcing body 9. It is provided at equal angles to the center of the gold 3.
  • studs 14, 14 ... To prevent the upper refractory 15 from falling off are provided on the upper surface of the horizontal reinforcing body 9 and the upper surface of the inclined support portion 16 of the brick upper support 8, respectively. .. Then, as described above, the brick upper support 8 integrated with the horizontal reinforcing body 9 presses the upper surface of the outer refractory bricks 6, 6 ... On the lower surface of the inclined support portion 16, and the locking piece 17 is used on the outer side. The outer surfaces of the refractory bricks 6, 6 ... are locked.
  • an upper refractory 15 made of an amorphous refractory (alumina-based castable) is formed so as to cover the upper side of the brick upper support 8 and wrap the horizontal reinforcing body 9, and the outer peripheral surface becomes cylindrical.
  • FIG. 4 is an enlarged view of the installation portion of the brick upper support 8, and the amorphous refractory constituting the upper refractory 15 is locked at the tip (lower end) of the brick upper support 8.
  • the outer surface and the lower end surface of the piece 17 are also covered.
  • the amorphous refractory located outside the locking piece 17 and the amorphous refractory located below the lower end surface of the locking piece 17 both have a thickness of about 5 mm.
  • metal pipes 5, 5, ... For discharging lift gas (argon gas) are provided at the upper end of the core metal 3.
  • These metal pipes 5, 5, ... Consists of a discharge portion bent in a substantially L shape and a relay portion extended in the vertical direction.
  • the upper portion of the discharge portion is in a state of vertically projecting upward from the amorphous refractory material 15, and the lower portion of the discharge portion penetrates the core metal and is connected to the upper end of the relay portion. It is in the state of being.
  • the lower end of the relay portion is in a state of communicating with the through holes 13, 13 ... drilled in the lower refractory bricks 2b, 2b ...
  • a thick cylindrical lower refractory 7 made of an amorphous refractory (alumina-magnesia castable) is formed at the lower end of the core metal 3, and the inner and outer circumferences of the lower end of the core metal 3 are formed.
  • the lower surface of the inner refractory layer 2, the lower surface of the fall restraint body 10, the lower surface of the brick lower support 11, and the lower inclined surface of the outer refractory bricks 6, 6, ... Are integrally covered.
  • the inner peripheral surface of the lower refractory 7 is flush with the inner peripheral surface of the inner refractory layer 2, and the outer peripheral surface of the lower refractory 7 is the outer peripheral surface of the outer refractory bricks 6, 6, ... It is flush with each other.
  • the amorphous refractory material that fills the gap between the inner surface of the outer refractory bricks 6, 6 ... And the outer peripheral surface of the core metal 3 and the amorphous refractory material that constitutes the lower refractory material 7 are integrated.
  • FIG. 5 shows an example of how to use the immersion tube 1 configured as described above.
  • a pair of dipping pipes 1 are connected to a recirculation pipe C fixed at the lower end of the vacuum degassing device M, and the portion near the lower end is immersed in the molten metal (melted iron) S in the pan 24. It is used in the state where it is made.
  • One of the two immersion tubes 1 and 1 so installed (the immersion tube 1a on the left side of FIG. 5) functions as an ascending tube, and the other (the immersion tube 1b on the right side of FIG. 5) descends. Functions as a tube.
  • the upper tank 22 and the lower tank 23 of the vacuum degassing device M are put into a vacuum state, and an inert gas (argon gas or the like) is blown into the immersion pipe 1a which is an ascending pipe via the pipe.
  • an inert gas argon gas or the like
  • the molten metal in the intake pot 24 is drawn into the lower tank 23 side and rises the molten metal passage (inside the inner refractory layer 2) R of the immersion pipe 1a which is an ascending pipe, and then the immersion pipe 1b which is a descending pipe. It descends the molten metal passage R of the above and returns to the pan 24 to recirculate. In the process of such recirculation, the molten metal is degassed.
  • the heat load constitutes the upper refractory material 15. Since it is absorbed by the irregular refractory (alumina-based castable), deformation and melting of the brick upper support 8 are prevented with high accuracy.
  • the immersion tube 1 includes an iron core metal 3 formed in a cylindrical shape and an inner refractory layer 2 (that is, upper refractory bricks 2a, 2a ... And lower stage) provided inside the core metal 3. (2b, 2b 7), a plurality of outer refractory bricks 6, 6 ... arranged in a circumferential shape on the outside of the core metal 3, and to support the lower end edge of the outer refractory bricks 6, 6 ...
  • a brick lower support 11 and a brick upper support 8 for supporting the upper ends of the outer refractory bricks 6, 6 ... are provided, and the upper side of the brick upper support 8 is an amorphous refractory (alumina). System castable) 15 covered.
  • the brick upper support 8 is not exposed to scattered splashes (splashes of molten steel) and is not easily affected by radiant heat or the like, and the impact is applied to the upper part of the brick during the slag removal work. Since it is difficult to transmit to the support 8, the installation portion of the brick upper support 8 is not easily damaged. Therefore, according to the immersion tube 1, the service life can be extended and frequent maintenance is not required, so that the maintenance cost can be kept low.
  • the immersion tube 1 is provided with the brick upper support 8 in an annular shape inclined outward, the thermal expansion stress that tends to diffuse in the radial direction to the outer refractory bricks 6, 6 ... Even when the above is added, the thermal expansion stress can be effectively suppressed and the outer refractory bricks 6, 6 ... Can be prevented from falling off.
  • a locking piece 17 for locking the side surfaces of the outer refractory bricks 6, 6 ... Is connected vertically downward to the tip of the brick upper support 8 and the locking thereof. Since the outer part of the piece 17 is covered with an amorphous refractory (alumina-based castable) 15, the locking piece 17 is not exposed to scattered splashes during use and is not easily affected by radiant heat. The piece 17 can continue to lock the sides of the outer refractory bricks 6, 6, ... Therefore, according to the immersion pipe 1, it is possible to effectively prevent the outer refractory bricks 6, 6, ... From falling off over a long period of time.
  • the immersion pipe 1 has studs 14a, 14a ... Protruding on the upper surface of the brick upper support 8 to prevent the amorphous refractory 15 from falling off, the upper side of the brick upper support 8 is provided. Since the amorphous refractory 15 that covers the brick is hard to fall off, it is possible to prevent damage to the installation portion of the brick upper support 8 with high accuracy for an extremely long period of time.
  • the immersion pipe according to the present invention is not limited to the embodiment described above, and includes a core metal, a brick upper support, a brick lower support, a horizontal reinforcing body, an inner refractory layer, an outer refractory brick, and the like.
  • the composition of the material, shape, structure, size, etc. can be appropriately changed as necessary without departing from the spirit of the present invention.
  • the amorphous refractory covering the upper side of the brick upper support (that is, the amorphous refractory constituting the upper refractory) is an alumina-based castable. It is also possible to change the amorphous refractory covering the upper side of the brick upper support to a material other than the alumina-based castable such as the alumina-magnesia-based castable.
  • the amorphous refractory covering the upper side of the brick upper support is made of a high-strength material such as an alumina-based castable as in the above embodiment, the brick upper support is prevented from being deformed and melted with higher accuracy. There is a merit that it becomes possible to do.
  • the immersion pipe according to the present invention is not limited to the amorphous refractory constituting the lower refractory being an alumina-magnesia castable as in the above embodiment, and the amorphous refractory constituting the lower refractory. Can be changed to another material such as alumina-based castable.
  • the amorphous refractory constituting the lower refractory is made of a material having high spalling resistance such as an alumina-magnesia castable as in the above embodiment, the deformation of the lower part of the core metal is performed with higher accuracy. There is an advantage that it can be prevented.
  • the immersion pipe according to the present invention is not limited to the one in which the inner refractory layer is made of magnesia-chromium material as in the above embodiment, and the inner refractory layer is made of magnesia-carbon material depending on the operating conditions and the like. It is also possible to change to a material other than magnesia-chromic material such as wood.
  • the immersion pipe according to the present invention is not limited to the one in which the brick upper support has the inclined support portion fixed to the horizontal reinforcing body (welded) as in the above embodiment, and the inclined support portion is the core. It is also possible to change to something that is directly fixed to gold.
  • the inclined support portion of the brick upper support is fixed to the horizontal reinforcing body as in the above embodiment, the amorphous refractory constituting the upper reinforcing body is more effectively prevented from falling off.
  • the horizontal reinforcing body effectively blocks the heat transferred from the upper part of the immersion tube, it is possible to prevent deformation and melting of the inclined support portion with higher accuracy.
  • the reinforcing support is a vertical rod-shaped body (cylindrical body) as in the above embodiment. It is not limited to the above, but is integrally formed in a cylindrical shape (flat cylindrical shape) having a constant thickness, or at predetermined intervals (equal intervals or non-equal intervals) along the circumferential upper surface of the brick upper support. It may be a plate such as a plurality of triangular shapes (triangular shapes that gradually widen outward) or trapezoidal shapes (trapezoidal shapes that gradually widen outward) that are installed (welded) in.
  • the immersion pipe according to the present invention is covered with an amorphous refractory on the outside and / or the lower side of the locking piece of the brick upper support as in the above embodiment, the locking piece
  • the thickness of the amorphous refractory covering the outside and / or the underside can be changed as needed, and when the thickness is adjusted to the range of 5 to 15 mm, an unnecessarily large amount of amorphous refractory It is possible to effectively prevent deformation and melting of the locking piece without using an object.
  • a stud obtained by bending a metal rod-shaped body into a V shape is used as a core metal, a brick upper support, a brick lower support, a fall prevention body, or the like.
  • the shape of the stud is not limited to the protruding one, and it is possible to change the shape of the stud to a plate-shaped folded back, a Y-shaped bent, or the like.
  • a single or a plurality of annular bodies made of metal in a band shape or a rod shape are wound around the outer periphery of the lower end edge. It is also possible to change it to something else.
  • the inclined support portion of the brick upper support has an angle of 45 ° with respect to the horizontal plane (that is, the inclined surface on the upper side of each outer fireproof brick is formed.
  • the inclination angle of the inclined support portion of the brick upper support is approximately 0. It can be changed as needed within the range of ⁇ 60 °.
  • the immersion pipe according to the present invention is not limited to the one in which the outer peripheral surface of the lower refractory and the outer peripheral surface of the outer refractory brick are flush with each other as in the above embodiment, and the lower refractory and the outer refractory are not limited to the same. It is also possible to change the lower side (lower part) of the outer refractory brick to one covered with a lower refractory material for the purpose of preventing molten steel from infiltrating from the boundary of the brick.
  • the immersion pipe according to the present invention exerts an excellent effect as described above, it is suitable as a member or the like which is attached to a vacuum degassing device to function as an ascending pipe or a descending pipe when secondary refining molten steel. Can be used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un tube plongeur avec lequel un raccord métallique pour verrouiller une brique réfractaire externe n'est pas susceptible d'être endommagé, la durée de vie est longue, la maintenance fréquente est inutile, et les coûts de maintenance peuvent être réduits. La solution selon l'invention porte sur un tube plongeur 1 qui comprend : un métal de base en fer 3 formé dans une forme cylindrique ; une couche réfractaire interne 2 disposée sur le côté interne du métal de base 3 ; une pluralité de briques réfractaires extérieures 6, 6... disposées dans une forme circonférentielle sur le côté extérieur du métal de base 3 ; un corps de support inférieur de brique 11 destiné à supporter les bords d'extrémité inférieurs des briques réfractaires extérieures 6, 6... ; et un corps de support supérieur de brique 8 destiné à supporter les bords d'extrémité supérieurs des briques réfractaires extérieures 6, 6.... Le côté supérieur du corps de support supérieur de brique 8 est recouvert d'un réfractaire non façonné 15.
PCT/JP2019/046462 2019-11-27 2019-11-27 Tube plongeur pour traitement d'acier en fusion WO2021106120A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2019/046462 WO2021106120A1 (fr) 2019-11-27 2019-11-27 Tube plongeur pour traitement d'acier en fusion

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Application Number Priority Date Filing Date Title
PCT/JP2019/046462 WO2021106120A1 (fr) 2019-11-27 2019-11-27 Tube plongeur pour traitement d'acier en fusion

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WO2021106120A1 true WO2021106120A1 (fr) 2021-06-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024421A (en) * 1990-05-08 1991-06-18 Usx Corporation Interlocking snorkel refractory
JPH0539522A (ja) * 1991-08-02 1993-02-19 Toshiba Ceramics Co Ltd ガス吹き込み用ランスパイプ
JPH0734119A (ja) * 1993-07-19 1995-02-03 Daido Steel Co Ltd 真空脱ガス装置用浸漬管
JP2012167868A (ja) * 2011-02-15 2012-09-06 Tokyo Yogyo Co Ltd 攪拌装置
JP2013234346A (ja) * 2012-05-08 2013-11-21 Tokyo Yogyo Co Ltd 真空脱ガス装置の浸漬管または下部槽

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024421A (en) * 1990-05-08 1991-06-18 Usx Corporation Interlocking snorkel refractory
JPH0539522A (ja) * 1991-08-02 1993-02-19 Toshiba Ceramics Co Ltd ガス吹き込み用ランスパイプ
JPH0734119A (ja) * 1993-07-19 1995-02-03 Daido Steel Co Ltd 真空脱ガス装置用浸漬管
JP2012167868A (ja) * 2011-02-15 2012-09-06 Tokyo Yogyo Co Ltd 攪拌装置
JP2013234346A (ja) * 2012-05-08 2013-11-21 Tokyo Yogyo Co Ltd 真空脱ガス装置の浸漬管または下部槽

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