WO2017110945A1 - スカム除去装置及びスカム除去方法 - Google Patents
スカム除去装置及びスカム除去方法 Download PDFInfo
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- WO2017110945A1 WO2017110945A1 PCT/JP2016/088243 JP2016088243W WO2017110945A1 WO 2017110945 A1 WO2017110945 A1 WO 2017110945A1 JP 2016088243 W JP2016088243 W JP 2016088243W WO 2017110945 A1 WO2017110945 A1 WO 2017110945A1
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- steel strip
- suction
- width direction
- hot
- scum
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0032—Apparatus specially adapted for batch coating of substrate
- C23C2/00322—Details of mechanisms for immersing or removing substrate from molten liquid bath, e.g. basket or lifting mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
- F27D3/1554—Equipment for removing or retaining slag for removing the slag from the surface of the melt
- F27D3/1572—Equipment for removing or retaining slag for removing the slag from the surface of the melt by suction
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
- C23C2/00342—Moving elements, e.g. pumps or mixers
- C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0035—Means for continuously moving substrate through, into or out of the bath
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
- C23C2/004—Snouts
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/325—Processes or devices for cleaning the bath
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Definitions
- the present disclosure relates to a scum removing device and a scum removing method for removing scum floating in a snout of a hot dip plated steel sheet manufacturing facility.
- a technology is used in which a discharge port and a suction port are provided on both sides of the steel strip in the snout in the width direction of the steel strip to form a flow in the width direction of the steel strip, and the scum is sucked by the suction port.
- the following technologies have been proposed.
- Patent Document 1 Japanese Patent Application Publication No. 2010-229530 (hereinafter referred to as Patent Document 1), a pair of discharge port and suction port that form a pair is provided on both sides in the steel strip thickness direction to remove suspended matters. A countermeasure method is disclosed.
- Patent Document 2 Japanese Patent Application Publication No. 2000-0664015 (hereinafter referred to as Patent Document 2) and Japanese Patent Application Publication No. 2014-114484 (hereinafter referred to as Patent Document 3) disclose one side in the width direction of the steel strip.
- Patent Document 3 discloses one side in the width direction of the steel strip.
- a configuration is disclosed in which a discharge port for discharging the molten plating solution is provided on the side, and a suction port for sucking the molten plating solution is provided on the other side in the steel strip width direction.
- Patent Document 4 Japanese Patent Application Publication No. 2003-293107 (hereinafter referred to as Patent Document 4), two discharge ports are provided on one side in the steel strip width direction, and one suction port is provided on the other side in the steel strip width direction.
- Patent Document 4 Japanese Patent Application Publication No. 2003-293107
- Patent Document 5 a plate member is moved back and forth in order to solve the problem when an injection nozzle for injecting a molten plating solution is provided.
- a dross moving device that generates waves is provided.
- Patent Document 2 and Patent Document 3 a technique for forming a flow having directivity from one side in the width direction of the steel strip to the other side is provided.
- an accompanying flow is generated on the surface of the hot dip plating as the steel strip is drawn into the hot dip galvanizing solution. For this reason, if only the hot dip galvanizing solution is discharged from one side to the other side in the width direction of the steel strip, the effect of the accompanying flow is won on the suction port side, and the scum flows toward the steel strip surface. .
- Patent Document 2 proposes a configuration in which a partition plate parallel to the steel strip is installed, but the scum adhering to the partition plate surface is easily dropped from the partition plate due to a fast flow in the rectifying direction. Adhering to the surface tends to cause surface defects.
- Patent Document 2 proposes a technique for forcibly generating a bath surface flow that is separated in a direction substantially perpendicular to the plane of the steel strip.
- a strong flow that flows from both ends in the steel strip width direction toward the center of the plate width occurs, there is a problem that the scum that has flowed in easily adheres to both ends of the steel strip in the steel strip width direction.
- the present disclosure is to provide a scum removing device and a scum removing method capable of suppressing the adhesion of scum floating on the hot dipping bath surface to the steel strip with the full width of the steel strip.
- the inventors have found that the scum adhering to the snout wall surface in the vicinity of the plating bath surface peels off and adheres to the steel strip, resulting in a defect in the steel strip.
- the scum adhering to the snout wall surface at the boundary between the inner surface of the snout and the bath surface is made difficult to peel off, and even if the scum is peeled off, the scum does not flow to the steel strip surface. I have found that the surface flow can be controlled.
- a scum removing device includes a snout inserted in a hot dipping solution of a hot dipping pot and a hot dipping bath surface on the inside, and a steel band width direction at a steel band intrusion position of the hot dipping bath surface.
- the suction part is composed of a first suction part and a second suction part, and the first suction part and the second suction part are extended in the steel strip width direction of the steel strip intrusion position on the hot dipping bath surface. They are spaced apart from each other across the line.
- the scum removing device can suppress adhesion of scum floating on the hot dipping bath surface to the steel strip.
- FIG. 2 is a schematic cross-sectional view of the inside of a snout as seen from the direction of line 2-2 in FIG.
- FIG. 3 is a schematic cross-sectional view of a hot dipping bath surface as viewed from the direction of line 3-3 in FIG. 2 in a snout.
- FIG. 5 is a sectional view taken along line 5-5 of FIG. 4 showing a discharge nozzle. It is the schematic sectional drawing to which the one side of FIG. 3 was expanded. It is the schematic sectional drawing to which the other side of FIG. 3 was expanded.
- FIG. 1 It is a schematic perspective view which shows a suction nozzle. It is a schematic perspective view which shows the suction nozzle of a 1st modification. It is a schematic perspective view which shows the suction nozzle of a 2nd modification. It is a schematic sectional drawing in the 2nd modification which expanded the other side of FIG. It is a schematic sectional drawing which shows the flow of the hot dipping liquid in embodiment. It is a schematic sectional drawing which shows the flow of the hot-dipping liquid in a 2nd modification. It is a schematic sectional drawing which shows the flow of the hot-dipping liquid in a 3rd modification. It is a schematic perspective view which shows the suction nozzle of a 4th modification.
- FIG. 1 It is a schematic sectional drawing in the 4th modification which expanded the other side of FIG. It is a figure which shows the flow of the scum in the 1st comparative example by which the discharge part which does not have a rectification
- FIG. 1 shows, as an example, a schematic configuration of a plating facility 12 including one aspect of a scum removing device 10 and a scum removing method according to the present embodiment.
- the plating facility 12 is a facility for plating a steel strip 14 having a thickness of 1 mm to 3 mm, for example.
- the plating facility 12 stores a continuous reduction annealing furnace 16 for annealing the steel strip 14 and a molten plating solution 18.
- the hot-dip plating pot 20 is provided.
- the molten zinc is used as the hot dipping solution 18 and the steel strip 14 is galvanized by dipping will be described as an example, but is not limited thereto.
- the steel strip 14 can be tin-plated, and if molten aluminum is used, the steel strip 14 can be aluminum-plated.
- a snout 22 extends from the reduction annealing furnace 16, and the snout 22 extends downward from the reduction annealing furnace 16 in the lateral direction and obliquely downward from the extension 22 A toward the hot dipping pot 20. And an inclined portion 22 ⁇ / b> B extending to the center.
- the snout 22 is formed in a rectangular cylindrical shape surrounding the steel strip 14, and the tip of the snout 22 is inserted into the hot dipping solution 18 of the hot dipping pot 20.
- the internal space of the snout 22 is cut off from the outside, and the snout 22 constitutes a pipe line that maintains the airtightness between the reduction annealing furnace 16 and the hot dipping pot 20 and connects them.
- the internal space of the snout 22 is filled with a reducing gas for suppressing oxidation of the steel strip 14 and the steel strip 14 is immersed in the hot dipping solution 18 of the hot dipping pot 20 without being exposed to air. Is done.
- the feed roll 26 which changes the conveyance direction 24 of the steel strip 14 diagonally downward is provided in the base end side of the inclination part 22B of the snout 22. As shown in FIG. The steel strip 14 annealed in the reduction annealing furnace 16 is conveyed in the length direction along the snout 22 and is drawn into the hot dipping bath surface 28 in the snout 22.
- the steel strip 14 has a transport path in the snout 22 defined by a feed roll 26 and a guide roll 30 disposed in the hot dipping pot 20. Stabilization of the position to enter. And the conveyance direction 24 is changed upward by the guide roll 30, and the steel strip 14 is sent out from the hot dipping pot 20 to the next process.
- FIG. 2 is a schematic sectional view schematically showing the inside of the snout 22 taken along line 2-2 of FIG.
- Peep windows 32 are provided on both sides of the inclined portion 22B of the snout 22 in the steel strip width direction KH.
- the steel strip width direction KH indicates a direction orthogonal to the transport direction 24 of the steel strip 14.
- the observation window 32 is provided with a camera 34.
- the camera 34 photographs the state in which the steel strip 14 is drawn into the hot dipping bath surface 28 at the steel strip intrusion position 29.
- the steel strip intrusion position 29 is a position where the steel strip 14 and the hot dipping bath surface 28 intersect, or a position where the steel strip 14 and the hot dipping bath surface 28 are planned to cross, and in the plan view.
- a long straight line is formed in the width direction KH.
- the scum 36 adheres to the steel strip 14 and causes surface defects. For this reason, the quality defect resulting from the scum 36 is suppressed by providing the scum removing device 10 described in detail below in the snout 22.
- FIG. 3 is a schematic cross-sectional view showing a state in which the hot dipping bath surface 28 is viewed from above in the snout 22 (the snout 22 and the steel strip 14 are cut horizontally).
- the steel strip 14 moves in a direction penetrating from the front of the drawing to the back.
- symbol 60 shows the extension line
- the extension line 60 is at a substantially equidistant position from the one inner wall surface 22D and the other inner wall surface 22E.
- a discharge device 40 is provided on an extension line 60 of the steel strip 14 on one side H1 in the width direction of the steel strip 14 (left side in the figure).
- the discharge device 40 includes a cylindrical discharge pipe 42 bent in a U shape.
- the discharge pipe 42 includes an outer vertical pipe portion 42A that is disposed outside the snout 22 and extends in the longitudinal direction, and a communication portion 42B that extends from the lower end portion of the outer vertical pipe portion 42A into the snout 22.
- the discharge pipe 42 includes an inner vertical pipe portion 42C that extends upward from the tip of the communication portion 42B and is disposed inside the snout 22.
- the base end portion of the outer vertical pipe portion 42A of the discharge pipe 42 extends upward from the hot dipping bath surface 28, and a motor 46 is provided at the base end of the outer vertical pipe portion 42A.
- a screw 48 is provided on the drive shaft of the motor 46, and the screw 48 is driven to rotate in the molten plating solution 18.
- an intake port 50 is formed on the opposite side to the snout 22.
- the molten plating solution 18 taken into the outer vertical pipe portion 42A from the intake port 50 opened to the outside of the snout 22 is pumped to the communicating portion 42B and the inner vertical pipe portion 42C with the rotating screw 48.
- a rectangular parallelepiped discharge nozzle 52 that discharges the molten plating solution 18 to the molten plating bath surface 28 in the snout 22 is provided at the distal end portion of the inner vertical tube portion 42 ⁇ / b> C. As will be described later, the discharge nozzle 52 will be described with the direction in which the molten plating solution 18 is discharged toward the steel strip 14 as the front.
- the discharge nozzle 52 includes a bottom plate 52B having a circular hole 52A communicating with the inner vertical pipe portion 42C, and side walls 52C standing on both side edges of the bottom plate 52B.
- the discharge nozzle 52 includes a rear wall 52D that stands on the rear edge of the bottom plate 52B, and a top plate 52E that connects the side walls 52C and the rear wall 52D at the upper edge.
- An extension plate 52F extends toward the bottom plate 52B from the front edge of the top plate 52E, and a discharge portion 56 that opens to the steel strip 14 side is formed between the extension plate 52F and the bottom plate 52B.
- the extension plate 52 ⁇ / b> F suppresses the ripple of the molten plating solution 18 discharged from the discharge unit 56.
- a pair of rectifying plates 58 is erected on the bottom plate 52B, and the rectifying plate 58 is long enough to be supported by the extension plate 52F as shown in FIG. It is formed in a rectangular shape having a thickness.
- the discharge nozzle 52 is disposed so that the lower side is located in the molten plating solution 18.
- the flow of the molten plating solution 18 discharged from the discharge unit 56 is rectified in the steel strip width direction KH by the rectifying plate 58 and the side wall 52 ⁇ / b> C, and the straightness is improved. Further, since the discharged molten plating solution 18 is rectified by the rectifying plate 58 and the side wall 52C, the flow velocity in the vicinity of the steel strip 14 (component in the steel strip width direction KH) is improved as compared with the case where it is not rectified. Scum 36 is allowed to flow quickly.
- the discharge part 56 is disposed on the extension line 60 of the steel strip 14 extending in the steel strip width direction KH, and the substantially width direction center of the discharge part 56 is located on the extension line 60 of the steel strip 14.
- the discharge device 40 discharges the molten plating solution 18 taken outside the snout 22 through the intake port 50 from the one side H1 in the width direction of the steel strip 14 to the steel strip 14 side by the discharge portion 56, and a hot dipping bath. A flow is formed on the surface 28.
- a suction device 62 is provided on the other side H ⁇ b> 2 in the width direction of the steel strip 14 (right side in the drawing).
- the suction device 62 includes a cylindrical suction pipe 64 bent in a U shape.
- the suction pipe 64 includes an outer vertical pipe portion 64A that is disposed outside the snout 22 and extends in the vertical direction, and a communication portion 64B that extends from the lower end portion of the outer vertical pipe portion 64A into the snout 22.
- the suction pipe 64 includes an inner vertical pipe portion 64C that extends upward from the tip of the communication portion 64B and is disposed inside the snout 22.
- the base end portion of the outer vertical pipe portion 64 ⁇ / b> A of the suction pipe 64 is arranged to extend upward from the hot dipping bath surface 28.
- a discharge port 66 is opened at a height position in the molten plating solution 18 on the side opposite to the snout 22.
- a gas supply pipe 68 for supplying nitrogen gas (N 2) sent from a supply source (not shown) is inserted into the proximal end opening of the outer vertical pipe portion 64A.
- the distal end of the gas supply pipe 68 reaches the lower portion of the outer vertical pipe portion 64A.
- the molten plating solution 18 is discharged from the discharge port 66 by the nitrogen gas supplied from the gas supply pipe 68, and the internal pressure is reduced. As the internal pressure decreases, the molten plating solution 18 in the inner vertical pipe portion 64C flows into the outer vertical pipe portion 64A via the communication portion 64B.
- the edge part of the inner side longitudinal pipe part 64C comprises the 1st suction nozzle 71A and the 2nd suction nozzle 71B, as shown in FIG.3 and FIG.7.
- the opening parts of the first suction nozzle 71A and the second suction nozzle 71B constitute a first suction part 72 and a second suction part 74, and the suction for sucking the molten plating solution 18 by the first suction part 72 and the second suction part 74.
- Part 64H (see FIG. 3) is configured.
- the suction portion (the first suction portion 72 and the second suction portion 74) is provided in the nozzle (the first suction nozzle 71A and the second suction nozzle 71B) and indicates an opening portion that sucks the molten plating solution 18.
- the first suction nozzle 71 ⁇ / b> A and the second suction nozzle 71 ⁇ / b> B can be constituted by the suction pipes 64 of the pair of suction devices 62, for example.
- the suction pipes 64 are provided in the steel strip thickness direction KT (see FIG. 7) along the vertical direction.
- the upper end portion of the inner vertical pipe portion 64C of one suction pipe 64 constitutes the first pipe 64F.
- the upper end portion of the inner vertical pipe portion 64C of the other suction pipe 64 constitutes the second pipe 64G.
- the steel strip intrusion position 29 side (see FIG. 7) at the tip of the first pipe 64F is cut obliquely, and the opening surface is inclined so as to open toward the steel strip intrusion position 29 side on the hot dipping bath surface 28. is doing. That is, the opening surface at the tip of the first pipe 64F intersects the hot dipping bath surface 28 with an inclination.
- tip part of the 1st pipe 64F comprises the 1st suction nozzle 71A which has the 1st suction part 72 which suck
- the steel strip intrusion position 29 side (see FIG. 7) at the tip of the second pipe 64G is also cut obliquely, and the opening surface is inclined so as to open toward the steel strip intrusion position 29 side on the hot-dip plating bath surface 28. is doing. That is, the opening surface at the tip of the second pipe 64 ⁇ / b> G is inclined and intersects with the hot dipping bath surface 28.
- tip part of the 2nd pipe 64G comprises the 2nd suction nozzle 71B which has the 2nd suction part 74 which sucks the molten plating solution 18.
- the suction portion 64H for sucking and removing the scum 36 (see FIG. 3) floating the molten plating solution 18 together with the molten plating solution 18 is constituted by the first suction portion 72 and the second suction portion 74.
- the first pipe 64F and the second pipe 64G may be divided into two branches from the main pipe 64I provided in the molten plating solution 18 (first modification).
- the configuration of the suction device 62 can be simplified by configuring the main pipe 64I at the end of the inner vertical pipe portion 64C.
- each of the suction nozzles 71A and 71B is not limited to this shape, and as shown in FIG. 10 (only the first suction nozzle 71C is shown) and FIG. In FIG. 11, the same or equivalent parts as those in FIGS. 3 and 7 are denoted by the same reference numerals and description thereof is omitted.
- the first suction nozzle 71C is provided at the tip of the inner vertical pipe portion 64C.
- the first suction nozzle 71C includes a bottom plate 70B having a circular hole 70A communicating with the inner vertical tube portion 64C, and a side wall that stands upward from both side edges of the bottom plate 70B. 70C.
- the first suction nozzle 71C is provided with a rear wall 70D that stands on the rear edge of the bottom plate 70B and has an edge connected to the side wall 70C.
- the side wall 70C constitutes a current plate and has a function of rectifying the flow of the sucked molten plating solution 18 in the steel strip width direction KH.
- the second suction nozzle 71D is configured similarly to the first suction nozzle 71C.
- the opening width SH1 (the opening width SH2 of the second suction nozzle 71D) is constant regardless of the height of the hot dipping bath surface 28, as shown in FIG. Become.
- the rectifying function of the rectifying plate formed by the side wall 70C will be described.
- the suction nozzles 71 ⁇ / b> A and 71 ⁇ / b> B that do not have side walls suck in the surrounding molten plating solution 18 centering on the suction portions 72 and 74. For this reason, the molten plating solution 18 in the snout 22 can also flow near the inner wall surfaces 22D and 22E.
- the suction direction can be adjusted to the steel strip width direction KH by using the suction nozzles 71C and 71D having the rectifying function by the side wall 70C.
- both the suction nozzles 71C and 71D are arranged apart from each other, the both suction nozzles 71C and 71D are arranged obliquely so that the respective suction portions 72 and 74 face the steel strip 14 side.
- the flow of the molten plating solution 18 in the vicinity of the inner wall surfaces 22D and 22E is suppressed.
- the first suction nozzles 71A, 71C and the second suction nozzles 71B, 71D have an extension line 60 of the steel strip 14 at the approximate center between the suction nozzles 71A, 71B, 71C, 71D. It is arranged to be located on the top.
- the 1st suction part 72 of 71 A of 1st suction nozzles and 71C is arrange
- the molten plating solution 18 on the molten plating bath surface 28 is sucked in at one side T1 in the thickness direction.
- the second suction portions 74 of the second suction nozzles 71B and 71D are arranged on the other side T2 in the thickness direction with the extension line 60 of the steel strip 14 as a boundary, and the other in the thickness direction from the extension line 60 of the steel strip 14 The hot dipping solution 18 on the hot dipping bath surface 28 is sucked in on the side T2.
- FIG. 6 is a view showing the width direction one side H1 of the snout 22.
- the discharge part 56 formed by the discharge nozzle 52 of the discharge device 40 is arranged so that the center in the width direction, which is the steel strip thickness direction KT, approximately coincides with the extension line 60 of the steel strip 14.
- the opening width TH in the thickness direction KT is set to 50 mm or more.
- a discharge region TR of the discharge unit 56 is determined by the opening width TH and the arrangement of the discharge unit 56.
- the discharge part 56 is arrange
- the separation distance SR1 from one end of the discharge unit 56 to the one inner wall surface 22D of the snout 22 is 100 mm or more.
- the separation distance SR2 from the other end of the discharge portion 56 to the other inner wall surface 22E of the snout 22 is also set to 100 mm or more, and the separation distance SR1 and the separation distance SR2 are set to be approximately the same size.
- FIG. 7 and 11 are views showing the other side H2 of the snout 22 in the width direction.
- the center of the steel strip thickness direction KT between the first suction nozzles 71 ⁇ / b> A and 71 ⁇ / b> C and the second suction nozzles 71 ⁇ / b> B and 71 ⁇ / b> D of the suction device 62 is disposed so as to substantially coincide with the extension line 60 of the steel strip 14.
- the amount of protrusion of the first suction nozzles 71A and 71C from the hot dipping bath surface 28 is adjusted.
- the opening width SH1 of the first suction portion 72 of the first suction nozzles 71A and 71C is set to 40 mm or more at the height position of the hot dipping bath surface 28.
- the separation distance CR1 from the edge on the extension line 60 side of the steel strip 14 of the first suction nozzles 71A and 71C to the extension line 60 is set to 30 mm or more. Since the first suction nozzle 71C has the side wall 70C, as described above, the opening width SH1 and the separation distance CR1 are constant regardless of the height of the hot dipping bath surface 28.
- the second suction nozzles 71B and 71D are adjusted in the amount of protrusion from the hot dipping bath surface 28. Thereby, opening width SH2 of the 2nd suction part 74 of 2nd suction nozzle 71B, 71D is made into 40 mm or more. Further, the separation distance CR2 from the edge on the extension line 60 side of the steel strip 14 of the second suction nozzles 71B and 71D to the extension line 60 is set to 30 mm or more. Since the second suction nozzle 71D has the side wall 70C, as described above, the opening width SH2 and the separation distance CR2 are constant regardless of the height of the hot dipping bath surface 28. Each of the suction nozzles 71A to 71D of this embodiment is provided approximately in a line symmetrical position with respect to the extension line 60.
- the center of the 1st suction part 72 is located in the thickness direction one side T1 rather than the end of the thickness direction one side T1 of the discharge part 56.
- the center of the second suction portion 74 is located on the one side T1 in the thickness direction from the end on the other side T2 in the thickness direction of the discharge portion 56.
- the suction nozzle 70 is provided at the tip of the inner vertical tube 46C.
- the suction nozzle 70 rises obliquely from the bottom plate 70B having a circular hole 70A communicating with the inner vertical tube portion 64C and both side edges of the bottom plate 70B.
- the side wall 70 ⁇ / b> C extends in the vertical direction.
- the suction nozzle 70 is erected on the rear edge of the bottom plate 70B and the edge is connected to the side wall 70C.
- the suction nozzle 70 is erected on the front edge of the bottom plate 70B and the edge is connected to the side wall 70C. It has a front wall 70E and is formed in a box shape opened upward.
- a rectangular notch 70F is formed on both sides of the upper edge of the front wall 70E.
- a first suction portion 72 and a second suction portion 74 which are examples of a first opening and a second opening that are opened to the steel strip 14 side by each notch portion 70F are formed, and a portion between the suction portions 72 and 74 is
- the shielding portion 76 is an uncut portion at the top of the front wall 70E.
- each suction part 72, 74 is arranged to be located below the hot dipping bath surface 28, and the upper edge of the side wall 70C and the rear wall 70D and the upper edge of the shielding part 76 of the front wall 70E.
- the part extends upward from the hot dipping bath surface 28. Accordingly, the scum 36 floating in the molten plating solution 18 can be sucked and removed together with the molten plating solution 18 by the first suction portion 72 and the second suction portion 74, and the shielding portion 76 sucks the molten plating solution 18. To prevent.
- the suction nozzle 70 is disposed so that the center in the width direction is located on the extension line 60 of the steel strip 14 as shown in FIG.
- the first suction portion 72 of the suction nozzle 70 is disposed on one side T1 in the thickness direction of the steel strip 14 with the extension line 60 of the steel strip 14 as a boundary, and on the one side T1 in the thickness direction from the extension line 60 of the steel strip 14.
- the molten plating solution 18 on the molten plating bath surface 28 is sucked in.
- the second suction portion 74 is disposed on the other side T2 in the thickness direction with the extension line 60 of the steel strip 14 as a boundary, and the hot dipping bath surface 28 on the other side T2 in the thickness direction from the extension line 60 of the steel strip 14.
- the hot-dip plating solution 18 is sucked in.
- the suction nozzle 70 is disposed so that the center in the width direction, which is the steel strip thickness direction KT, is approximately coincident with the extension line 60 of the steel strip 14.
- the suction nozzle 70 is a part on the extension line 60 of the steel strip 14. Is closed by a shield 76.
- the opening width SH1 of the first suction part 72 is set to 40 mm or more, and the separation distance CR1 from the edge of the suction nozzle 70 on the center side in the width direction to the center in the width direction of the suction nozzle 70 is set to 30 mm or more.
- the opening width SH2 of the second suction portion 74 is set to 40 mm or more, and the separation distance CR2 from the edge of the suction nozzle 70 in the width direction center side to the center in the width direction of the suction nozzle 70 is set to 30 mm or more.
- the suction nozzle 70 of the embodiment is approximately line symmetric with respect to the center in the width direction, that is, the extension line 60.
- the center of the 1st suction part 72 is located in the thickness direction one side T1 rather than the end of the thickness direction one side T1 of the discharge part 56.
- the center of the second suction part 74 is located on the other side T2 in the thickness direction from the end of the other side T2 in the thickness direction of the discharge part 56.
- FIG. 17 shows a discharge portion 56 that does not have the function of rectifying the molten plating solution 18 to be discharged on one side H ⁇ b> 1 in the width direction of the steel strip 14, and a suction portion 84 is provided on the other side H ⁇ b> 2 in the width direction of the steel strip 14.
- FIG. 18 shows a configuration using a discharge nozzle 52 having a flow straightening function by the flow straightening plate 58 and the side wall 52C shown in FIG. 4 instead of the discharge unit 56 in FIG. 17 (Comparative Example 2).
- FIG. 19 shows an example of this embodiment having two suction portions 72 and 74 instead of the suction portion 84 of FIG.
- FIG. 20 is a view showing a state of the hot dipping bath surface 28 in the snout 22.
- the hot dipping solution 18 is drawn together with the steel strip 14 sent in the conveying direction 24. As a result, an accompanying flow is generated.
- the molten plating solution 18 is discharged radially from the discharge unit 56 by concentric waves.
- an average flow is generated over the entire region of the short direction 22 of the snout 22 which is the steel strip thickness direction KT.
- the flow of the molten plating solution 18 has a relatively large flow rate even on the wall surface of the snout 22.
- the scum 36a attached to the wall surface of the snout 22 is easily peeled off.
- the flow velocity in the steel strip width direction KH in the vicinity of the steel strip 14 is approximately the same as that in the vicinity of the wall surface of the snout 22. For this reason, the flow velocity in the steel strip width direction KH is not so great that the scum 36a flows in a direction away from the end portion in the steel strip width direction KH. Therefore, the scum 36a is attracted to the steel strip 14 by the accompanying flow in which the molten plating solution 18 is drawn together with the steel strip 14, and adheres to the steel strip 14 to become a defect.
- the flow velocity in the steel strip width direction KH in the snout 22 is slowed in the vicinity of the wall surface of the snout 22 to suppress the falling of the scum 36b from the wall surface. Further, the flow velocity in the steel strip width direction KH is increased in the vicinity of the steel strip 14, and the scum 36b is caused to flow in the steel strip width direction KH against the accompanying flow. For this reason, compared with the basic composition (comparative example 1) of Drawing 17, adhesion to scum 36b to steel strip 14 can be controlled.
- the scum 36b may adhere to the steel strip 14 on the suction portion 84 side.
- the first suction portion 72 and the second suction portion 74 were arranged separately in the steel strip thickness direction KT, and an experiment was performed. Then, the flow toward the end of the steel strip 14 in FIG. 18 can be changed in a direction away from the steel strip 14 in the thickness direction KT of the steel strip, and the scum 36c can be changed to the first suction portion 72 and the second suction portion. I was able to inhale at 74.
- the scum removing device 10 discharges the molten plating solution taken from the outside of the snout 22 from the discharge unit 56 and forms a flow in the molten plating solution 18 in the snout 22.
- the scum 36 floating in the snout 22 flows toward the first suction portion 72 and the second suction portion 74.
- the flow of the molten plating solution from the width direction one side H1 to the width direction other side H2 of the steel strip 14 is drawn into the accompanying flow. It will be.
- the flow of the hot dipping solution from the discharge part 56 toward the first suction part 72 or the second suction part 74 is a steel strip as it goes from the width direction one side H1 of the steel strip 14 to the width direction other side H2.
- Leave 14 Thereby, the movement of the scum 36 drawn into the steel strip 14 side together with the molten plating solution 18 by the accompanying flow is suppressed to the steel strip 14 side, and the scum 36 floating on the hot dipping bath surface 28 adheres to the steel strip 14. Can be suppressed.
- the center of the first suction part 72 is located on the one side T1 in the thickness direction from the end on the one side T1 in the thickness direction of the discharge part 56. Further, the center of the second suction part 74 is located on the other side T2 in the thickness direction from the end of the other side T2 in the thickness direction of the discharge part 56.
- the 1st suction part 72 and the 2nd suction part 74 were arrange
- the opening widths SH1 and SH2 of the first suction portion 72 and the second suction portion 74 are set to 40 mm or more. Thereby, compared with the case where opening width SH1 and SH2 are less than 40 mm, the suction
- the suction direction can be adjusted to the steel strip width direction KH by using the suction nozzles 71C and 71D having a rectifying function.
- inhalation amount of the molten-plating liquid 18 in each suction part 72 and 74 can be increased compared with the case where a rectification
- the discharge part 56 is separated 100 mm or more from the inner surface of the snout 22 facing the steel strip 14 entering from the steel strip intrusion position 29 (SR1 ⁇ 100 mm, SR2 ⁇ 100 mm). For this reason, compared with the case where the space
- FIG. 21 shows a water model test (in a water bath) in which the change in flow velocity in the vicinity of the inner surface of the snout 22 when the separation distance SR1 from one end in the width direction of the discharge unit 56 to one inner wall surface 22D of the snout 22 is changed is measured. Result of the test.
- the opening width TH of the discharge part 56 is 50 mm or more. Therefore, compared with the case where opening width TH is less than 50 mm, the discharge amount of the hot-dipping liquid from the discharge part 56 can be increased, and the adhesion prevention effect of the scum 36 to the steel strip 14 can be heightened.
- FIG. 22 shows the experimental results in a table. This table shows the first and second comparative examples and the first and second experimental examples.
- the first comparative example is a comparative example in which a discharge portion not having a rectifying function is provided on one side H1 in the width direction and one suction portion is provided on the extension line 60 of the steel strip 14 on the other side H2 in the width direction. (Configuration of FIG. 17).
- a rectifying function was provided in the discharge section in the first comparative example (configuration in FIG. 18).
- the scum adhered mainly to the suction side end of the steel strip 14.
- Embodiment provides the discharge part which does not have a rectification
- 2nd Embodiment provided the rectification
- the scum removing apparatus includes a snout inserted in a hot dipping solution of a hot dipping pot and a hot dipping bath surface on the inside, and a steel band width direction at a steel band intrusion position of the hot dipping bath surface
- the suction portion includes a first suction portion and a second suction portion, and the first suction portion and the second suction portion are in the steel strip width direction of the steel strip intrusion position of the hot dipping bath surface.
- the discharge unit includes a rectifying plate that rectifies the flow of the discharged molten plating solution in the width direction of the steel strip.
- the scum removing device according to a third aspect is the first or second aspect, wherein the first suction portion and the second suction portion rectify the flow of the discharged molten plating solution in the steel strip width direction.
- the first suction part is configured such that an opening part of a pipe tip for sucking a molten plating solution opens toward the steel strip intrusion position side.
- the second suction part is formed of a first pipe having an inclined opening surface so that an opening at the tip of the pipe for sucking a molten plating solution opens toward the steel strip intrusion position side. It consists of two pipes.
- the first pipe and the second pipe are formed to be divided into two branches from the main pipe.
- the suction portion is constituted by a suction nozzle having a front wall facing the steel strip intrusion position side, and the suction nozzle
- the front wall is disposed on an extension line on the other side in the width direction of the steel strip, and a shielding portion for preventing the hot-dip plating solution from being sucked, and provided on one side portion of the shielding portion toward the steel strip intrusion position side
- a second opening that is provided on the other side of the shielding portion and that opens toward the steel strip intrusion position side
- the first suction portion includes the first suction portion.
- the second suction part is configured by the second opening.
- the discharge portion is disposed at a distance of 100 mm or more from an inner surface of the snout extending along the steel strip intrusion position.
- the discharge portion in a snout inserted into a hot dipping solution of a hot dipping pot and having a hot dipping bath surface on the inside, Discharge the molten plating solution from the extension line on one side, and sandwich the extension line in the steel strip width direction on the other side in the steel strip width direction of the hot-dip plating bath surface and the steel strip intrusion position on the hot-dip plating bath surface The molten plating solution is sucked in positions separated from each other.
- the first other aspect is “in order to remove the scum floating in the molten zinc bath in the snout connecting the reduction annealing furnace of the hot dip galvanized steel sheet manufacturing equipment and the molten zinc pot, A scum removing device comprising a suction nozzle that sucks scum together with molten zinc on the surface, wherein the suction nozzle is disposed on one surface side of a steel strip passing through the inside of the snout, and the steel A scum removing device comprising a second suction nozzle disposed on the other surface side of the belt.
- the second other aspect is described in “the first other aspect, wherein the first and second suction nozzles are disposed at the inner end of the steel strip passing through the snout in the width direction of the snout. Scum removal device.
- the third other aspect is that “the first and / or second suction nozzles are arranged at least 30 mm apart in the thickness direction of the steel strip with respect to the widthwise extension line of the steel strip. The scum removing device according to the second other aspect.
- the fourth other aspect is that “the first and / or second suction nozzle has an opening diameter of at least 40 mm or more in the thickness direction of the steel strip, The scum removing device according to the aspect.
- the disclosure of Japanese Patent Application No. 2015-251230 filed on Dec. 24, 2015 is incorporated herein by reference in its entirety.
- all documents, patent applications, and technical standards described in this specification are the same as when individual documents, patent applications, and technical standards are specifically and individually described to be incorporated by reference. Incorporated herein by
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Abstract
Description
また、吐出口がスナウト壁面に近くなるため、壁面での流れが速くなり、壁面に付着したスカムが剥離し、浴面に流れ出して鋼帯に付着しやすくなる。特にめっき浴に接するスナウト内壁面から剥離したスカムは大きさが大きく、問題となる。
図1は、本実施形態に係るスカム除去装置10、及びスカム除去方法の一態様を備えためっき設備12の概略構成が一例として示されている。このめっき設備12は、例えば厚さ1mm~3mmの鋼帯14にめっきを施す設備であり、めっき設備12は、鋼帯14を焼鈍する連続式の還元焼鈍炉16と、溶融めっき液18が貯留された溶融めっきポット20とを備えている。
図3は、スナウト22内で溶融めっき浴面28を上方から見た(スナウト22及び鋼帯14を水平に切断した)状態を示す模式断面図である。図3において、鋼帯14は図の紙面の手前から奥に貫く方向に移動する。
この吐出装置40は、U字状に屈曲された円筒状の吐出パイプ42を備えている。吐出パイプ42は、スナウト22の外側に配置された縦方向に延びる外側縦管部42Aと、外側縦管部42Aの下端部よりスナウト22内へ向けて延出した連通部42Bとを備えている。吐出パイプ42は、連通部42Bの先端より上方へ向けて延出しスナウト22の内側に配置された内側縦管部42Cを備えている。
吐出ノズル52は、内側縦管部42Cに連通する円形穴52Aを有した底板52Bと、底板52Bの両側縁部に起立した側壁52Cとを備えている。また、吐出ノズル52は、底板52Bの後縁部に起立した後壁52Dと、両側壁52C及び後壁52Dを上縁で連設する天板52Eとを備えている。天板52Eの前縁からは、延出板52Fが底板52B側へ向けて延出しており、延出板52Fと底板52Bとの間には、鋼帯14側に開口する吐出部56が形成されている。延出板52Fは、図5に示すように、吐出部56から吐出される溶融めっき液18の波立ちを抑える。
また、図2に示したように、鋼帯14の幅方向他方側H2(図中右側)には、吸込装置62が設けられている。この吸込装置62は、U字状に屈曲された円筒状の吸込パイプ64を備えている。吸込パイプ64は、スナウト22の外側に配置された縦方向に延びる外側縦管部64Aと、外側縦管部64Aの下端部よりスナウト22内へ向けて延出した連通部64Bとを備えている。また、吸込パイプ64は、連通部64Bの先端より上方へ向けて延出しスナウト22の内側に配置された内側縦管部64Cを備えている。
ここで、吸込部(第一吸込部72や第二吸込部74)は、ノズル(第一吸込ノズル71Aや第二吸込ノズル71B)に設けられ、溶融めっき液18を吸込む開口部分を示す。
図12に示すように、側壁を有さない各吸込ノズル71A、71Bは、各吸込部72、74を中心とした周囲の溶融めっき液18を吸い込む。このため、スナウト22内の溶融めっき液18には、各内壁面22D、22E近傍にも流れが生じ得る。
すなわち、内側縦管46Cの先端部には、吸込ノズル70が設けられている。各吸込部72、74の開口方向を前としたとき吸込ノズル70は、内側縦管部64Cに連通する円形穴70Aを有した底板70Bと、底板70Bの両側縁部より斜め方向へ起立し上部側が鉛直方向に延びた側壁70Cとを有している。また、吸込ノズル70は、底板70Bの後縁部に起立し縁部が側壁70Cに連設された後壁70Dと、底板70Bの前縁部に起立し縁部が側壁70Cに連設された前壁70Eとを備えており、上方に開口した箱型形状に形成されている。
図17は、鋼帯14の幅方向一方側H1に、吐出する溶融めっき液18の整流機能を有しない吐出部56が設けられ、鋼帯14の幅方向他方側H2に吸込部84が設けられた最も基本的な構成である(比較例1)。
図18は、図17の吐出部56に替えて、図4に示した整流板58及び側壁52Cによる整流機能を有した吐出ノズル52を用いた構成である(比較例2)。
図19は、図18の吸込部84に替えて、二つの吸込部72、74を有する本実施形態の一例である。
なお、図20は、スナウト22内の溶融めっき浴面28の状態を示す図であり、スナウト22内の溶融めっき浴面28では、搬送方向24へ送られる鋼帯14と共に溶融めっき液18が引き込まれることによって随伴流が生ずる。
すなわち、スカム除去装置10は、スナウト22の外側から取り込んだ溶融めっき液を吐出部56から吐出してスナウト22内の溶融めっき液18に流れを形成する。これにより、スナウト22内を浮遊したスカム36を第一吸込部72及び第二吸込部74へ向けて流す。このとき、吐出領域TRと吸込領域が一致する構成(例えば図17の構成)では、鋼帯14の幅方向一方側H1から幅方向他方側H2へ向かう溶融めっき液の流れは、随伴流に引き込まれてしまう。
吐出部56近傍の鋼帯幅方向KHの流速:250mm/s
一方内壁面22D近傍での流速測定位置:鋼帯幅方向KH中央
10 スカム除去装置
14 鋼帯
18 溶融めっき液
22 スナウト
22D 一方内壁面
22E 他方内壁面
28 溶融めっき浴面
36 スカム
56 吐出部
60 延長線
72 第一吸込部
74 第二吸込部
CR1 離間距離
CR2 離間距離
H1 幅方向一方側
H2 幅方向他方側
KH 鋼帯幅方向
KT 鋼帯厚み方向
SH1 開口幅
SH2 開口幅
SR1 離間距離
SR2 離間距離
T1 厚み方向一方側
T2 厚み方向他方側
TH 開口幅
TR 吐出領域
≪付記≫
本明細書からは、以下の態様が概念化される。
すなわち、第1の態様に係るスカム除去装置は、溶融めっきポットの溶融めっき液内に挿入され溶融めっき浴面を内側に有するスナウトと、前記溶融めっき浴面の鋼帯浸入位置における鋼帯幅方向の一方側の延長線上に配置された、溶融めっき液を吐出する吐出部と、前記溶融めっき浴面の鋼帯幅方向の他方側の延長線上に配置された、溶融めっき液を吸込む吸込部と、を備え、前記吸込部は、第一吸込部と第二吸込部からなり、前記第一吸込部と前記第二吸込部は、前記溶融めっき浴面の前記鋼帯浸入位置の鋼帯幅方向延長線を挟んで互いに離間して配置されている。
第2の態様に係るスカム除去装置は、第1の態様において、前記吐出部は、吐出した溶融めっき液の流れを前記鋼帯幅方向へ整流する整流板を備える。
第3の態様に係るスカム除去装置は、第1又は第2の態様において、前記第一吸込部と前記第二吸込部は、吐出した溶融めっき液の流れを前記鋼帯幅方向へ整流する整流板を備える。
第4の態様に係るスカム除去装置は、第1又は第2の態様において、前記第一吸込部は、溶融めっき液を吸い込むパイプ先端の開口部が前記鋼帯浸入位置側へ向けて開口するように開口面が傾斜した第一パイプで構成され、前記第二吸込部は、溶融めっき液を吸い込むパイプ先端の開口部が前記鋼帯浸入位置側へ向けて開口するように開口面が傾斜した第二パイプで構成されている。
第5の態様に係るスカム除去装置は、第4の態様において、前記第一パイプ及び前記第二パイプはメインパイプから二股に分かれて形成されている。
第6の態様に係るスカム除去装置は、第1から第3の態様において、前記吸込部は、前記鋼帯浸入位置側に面する前壁を備えた吸込ノズルで構成され、該吸込ノズルの前記前壁には、前記鋼帯幅方向の他方側の延長線上に配置され前記溶融めっき液の吸込を阻止する遮蔽部と、該遮蔽部の一側部に設けられ前記鋼帯浸入位置側へ向けて開口した第一開口部と、該遮蔽部の他側部に設けられ前記鋼帯浸入位置側へ向けて開口した第二開口部とが形成され、前記第一開口部で前記第一吸込部が構成されるとともに、前記第二開口部で前記第二吸込部が構成される。
第7の態様に係るスカム除去装置は、第1から第6の態様において、前記吐出部は、前記鋼帯浸入位置に沿って延びる前記スナウトの内面より100mm以上離間して配置されている。
第8の態様に係るスカム除去方法は、溶融めっきポットの溶融めっき液内に挿入され溶融めっき浴面を内側に有するスナウト内において、前記溶融めっき浴面の鋼帯浸入位置における鋼帯幅方向の一方側の延長線から溶融めっき液を吐出し、前記溶融めっき浴面の鋼帯幅方向の他方側で、かつ、前記溶融めっき浴面の前記鋼帯浸入位置の鋼帯幅方向延長線を挟んで互いに離間した位置で溶融めっき液を吸い込む。
また、本明細書からは、以下の他の態様が概念化される。
第1の他の態様とは、「溶融亜鉛めっき鋼板の製造設備の還元焼鈍炉と溶融亜鉛ポットとを連結するスナウト内において、溶融亜鉛浴中を浮遊するスカムを除去するために、溶融亜鉛浴面で溶融亜鉛とともにスカムを吸引する吸込ノズルを備えるスカム除去装置であって、前記吸込ノズルが、スナウト内を通過する鋼帯の一方の面側に配置される第一の吸込ノズルと、当該鋼帯の他方の面側に配置される第二の吸込ノズルとを備えてなるスカム除去装置。」
第2の他の態様とは、「前記第一および第二の吸込ノズルが、スナウト内を通過する鋼帯の幅方向のスナウト内端部に配置されている、第1の他の態様に記載のスカム除去装置。」
第3の他の態様とは、「前記第一および/または第二の吸込ノズルが、前記鋼帯の前記幅方向延長線に対し、当該鋼帯の厚み方向に少なくとも30mm以上離間して配置されている、第2の他の態様に記載のスカム除去装置。」
第4の他の態様とは、「前記第一および/または第二の吸込ノズルが、前記鋼帯の厚み方向に少なくとも40mm以上の開口径を有している、第2又は第3の他の態様に記載のスカム除去装置。」
2015年12月24日に出願された日本国特許出願2015-251230号の開示は、その全体が参照により本明細書に取り込まれる。
また、本明細書に記載されたすべての文献、特許出願及び技術規格は、個々の文献、特許出願及び技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
Claims (8)
- 溶融めっきポットの溶融めっき液内に挿入され溶融めっき浴面を内側に有するスナウトと、
前記溶融めっき浴面の鋼帯浸入位置における鋼帯幅方向の一方側の延長線上に配置された、溶融めっき液を吐出する吐出部と、
前記溶融めっき浴面の鋼帯幅方向の他方側の延長線上に配置された、溶融めっき液を吸込む吸込部と、を備え、
前記吸込部は、第一吸込部と第二吸込部からなり、
前記第一吸込部と前記第二吸込部は、前記溶融めっき浴面の前記鋼帯浸入位置の鋼帯幅方向延長線を挟んで互いに離間して配置されているスカム除去装置。 - 前記吐出部は、吐出した溶融めっき液の流れを前記鋼帯幅方向へ整流する整流板を備える請求項1に記載のスカム除去装置。
- 前記第一吸込部と前記第二吸込部は、吐出した溶融めっき液の流れを前記鋼帯幅方向へ整流する整流板を備える請求項1又は請求項2に記載のスカム除去装置。
- 前記第一吸込部は、溶融めっき液を吸い込むパイプ先端の開口部が前記鋼帯浸入位置側へ向けて開口するように開口面が傾斜した第一パイプで構成され、
前記第二吸込部は、溶融めっき液を吸い込むパイプ先端の開口部が前記鋼帯浸入位置側へ向けて開口するように開口面が傾斜した第二パイプで構成されている請求項1又は請求項2に記載のスカム除去装置。 - 前記第一パイプ及び前記第二パイプはメインパイプから二股に分かれて形成されている請求項4に記載のスカム除去装置。
- 前記吸込部は、前記鋼帯浸入位置側に面する前壁を備えた吸込ノズルで構成され、
該吸込ノズルの前記前壁には、前記鋼帯幅方向の他方側の延長線上に配置され前記溶融めっき液の吸込を阻止する遮蔽部と、該遮蔽部の一側部に設けられ前記鋼帯浸入位置側へ向けて開口した第一開口部と、該遮蔽部の他側部に設けられ前記鋼帯浸入位置側へ向けて開口した第二開口部とが形成され、
前記第一開口部で前記第一吸込部が構成されるとともに、前記第二開口部で前記第二吸込部が構成される請求項1から請求項3のいずれかに記載のスカム除去装置。 - 前記吐出部は、前記鋼帯浸入位置に沿って延びる前記スナウトの内面より100mm以上離間して配置されている請求項1から請求項6のいずれかに記載のスカム除去装置。
- 溶融めっきポットの溶融めっき液内に挿入され溶融めっき浴面を内側に有するスナウト内において、
前記溶融めっき浴面の鋼帯浸入位置における鋼帯幅方向の一方側の延長線から溶融めっき液を吐出し、
前記溶融めっき浴面の鋼帯幅方向の他方側で、かつ、前記溶融めっき浴面の前記鋼帯浸入位置の鋼帯幅方向延長線を挟んで互いに離間した位置で溶融めっき液を吸い込むスカム除去方法。
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JP7440751B2 (ja) | 2020-02-18 | 2024-02-29 | 日本製鉄株式会社 | 溶融金属めっき鋼帯の製造装置、および溶融金属めっき鋼帯の製造方法 |
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