KR101670183B1 - Apparatus for removing dross and, method for removing dross using the same - Google Patents

Apparatus for removing dross and, method for removing dross using the same Download PDF

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Publication number
KR101670183B1
KR101670183B1 KR1020150116787A KR20150116787A KR101670183B1 KR 101670183 B1 KR101670183 B1 KR 101670183B1 KR 1020150116787 A KR1020150116787 A KR 1020150116787A KR 20150116787 A KR20150116787 A KR 20150116787A KR 101670183 B1 KR101670183 B1 KR 101670183B1
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South Korea
Prior art keywords
dross
steel sheet
snout
steel
air knife
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KR1020150116787A
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Korean (ko)
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민왕기
김주형
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현대제철 주식회사
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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
    • 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
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • C23C2/26—After-treatment
    • 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
    • C23C2/30—Fluxes or coverings on molten baths
    • 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

Abstract

Disclosed is a device for removing dross and a method for removing dross using the same. The dross removing apparatus of the present invention comprises a strip for drawing a steel sheet; A steel slab drawn through the strips, a slab enclosing the steel strip so as to be shielded from the outside air and entering the galvanizing bath; A sink roll formed to immerse the steel sheet introduced through the Snout into the zinc plating solution; A stabilizing roll for stabilizing the steel plate passed through the sink roll and discharging the stabilized steel plate to the upper part of the galvanizing bath; And an air knife for plating a steel sheet discharged upward through the stabilizing roll according to a plating amount. The sliding member has a movable member capable of sliding back and forth by adjusting the level in the vertical direction on its outer wall surface do.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for removing a droplet,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dross removing apparatus and a dross removing method using the same, and more particularly, to a dross removing apparatus for forming a dross on an outer wall surface of a dross, .

The galvanized steel sheet production line produced in the steel mill is rolled so as to have a predetermined width and thickness, followed by pretreatment, heat treatment and plating.

At this time, the strip is plated on the surface of the steel plate while passing the hot dip galvanizing bath through the Snout through the heat treatment furnace at a constant speed, and the galvanized steel sheet having a certain thickness can be obtained by passing through the air knife.

During the zinc plating process, the molten zinc is exposed to the air and the dross is generated by the oxidizing action, which causes the surface defects and the like. Therefore, there is an increasing tendency to improve this.

Korean Patent Laid-Open No. 2003-0079217A (published on October 10, 2003, Droplet Removal Apparatus of Hot-dip Galvanizing Apparatus) as a related art.

According to an aspect of the present invention, there is provided a dross removing apparatus which is capable of easily removing dross floating between a screw and an air knife in a galvanizing bath.

According to another aspect of the present invention, there is provided a dross removing device capable of preventing the problem of dross surface sticking to the outer surface of a Snart.

According to still another aspect of the present invention, there is provided an air knife for a vehicle, which is capable of effectively removing a dross, which is partially adsorbed on a surface of a barrier, by a separate moving member capable of adjusting a level in a vertical direction, And to provide a device for removing dross.

According to still another aspect of the present invention, there is provided a method for removing a dross, which prevents worker safety accidents and various disasters caused by high-temperature heat of a zinc plating bath by reducing the specific gravity of the dross removing work.

According to another aspect of the present invention, there is provided a dross removing method for preventing dross inclusion in a steel plate through dross control floating around the air knife and improving the surface quality to an excellent level.

According to another aspect of the present invention, there is provided a dross removing method for increasing the service life of a facility such as a snout, and realizing a cost reduction effect such as cost reduction.

The above and other objects to be solved by the present invention can be achieved by the present invention described below.

According to an aspect of the present invention, there is provided a dross removing apparatus including: a strip for drawing a steel sheet; A steel slab drawn through the strips, a slab enclosing the steel strip so as to be shielded from the outside air and entering the galvanizing bath; A sink roll formed to immerse the steel sheet introduced through the Snout into the zinc plating solution; A stabilizing roll for stabilizing the steel plate passed through the sink roll and discharging the stabilized steel plate to the upper part of the galvanizing bath; And an air knife for plating the steel sheet upwardly discharged through the stabilizing roll according to a plating amount, wherein the slough is formed with a moving member capable of sliding back and forth movement by adjusting the level in the vertical direction on its outer wall surface .

In one embodiment, the moving member includes: a cylinder portion formed on an outer wall surface of the snout to support a shielding film; A control part formed on a bottom surface of the cylinder part and driving the shielding film in a vertical direction to reciprocate the slide; And a blocking layer formed on a bottom surface of the control unit to adsorb the dross introduced into the outer wall of the snout, to block the dross, to dope the dross, and to remove the dross.

In one embodiment, the barrier film is characterized by a U-shaped configuration with the central portion protruding.

In one embodiment, the barrier is characterized by being removable.

According to another aspect of the present invention, there is provided a method of removing dross, comprising: preparing a steel sheet and drawing the steel sheet along a strip; The steel sheet was taken in a galvanizing bath and discharged through an air knife through a sink roll; And removing the dross generated by oxidation by the air knife through a moving member, wherein the level is adjusted in a vertical direction through a control unit of a moving member formed on an outer wall surface of the snout, , The incoming dross is adsorbed on the barrier film, and the dross is removed by dipping.

In one embodiment, the barrier film is characterized by having a U-shaped configuration with a protruding central portion.

The dross removing device and the dross removing method using the same according to the present invention can easily remove the dross floating between the screw and the air knife in the zinc plating bath and prevent the problem of dross surface adhesion to the outer surface of the screw It is possible to efficiently remove the partially adsorbed dross on the surface of the barrier film caused by the level change of the galvanizing bath by a separate moving member capable of adjusting the level in the up and down direction without any additional work, It is possible to prevent safety accidents and various disasters caused by hot heat of the galvanizing bath, prevent dross from entering into the steel plate through suspension control floating around the air knife, improve the surface quality, By securing the cleanliness of facilities such as Snout, it can increase the lifespan of the equipment and realize cost reduction effect such as cost reduction. There.

1 is a cross-sectional view schematically showing a dross removing apparatus 100 according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing an upper section of a dross removal apparatus 100 according to one embodiment of the present invention.
3 is a cross-sectional view schematically showing the moving member 50 of the dross removing apparatus 100 according to one embodiment of the present invention.
4 is a side sectional view schematically showing the moving member 50 of the dross removing apparatus 100 from the side, according to one embodiment of the present invention.
5 is a process flow chart schematically showing a dross removal method according to one embodiment of the present invention.
6 is a cross-sectional view schematically showing a dross removing apparatus according to Comparative Example 1 of the present invention.

Embodiments of the present application will now be described in more detail with reference to the accompanying drawings. However, the techniques disclosed in the present application are not limited to the embodiments described herein but may be embodied in other forms. The embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise, and the terms "comprise" Components, components, or combinations thereof, and does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof .

Further, in carrying out the method or the manufacturing method, the respective steps of the method may take place differently from the stated order unless clearly specified in the context. That is, each process may occur in the same order as described, may be performed substantially concurrently, or may be performed in the opposite order.

Hereinafter, the present invention will be described in more detail.

De los  Removal device

One aspect of the present invention is directed to a method of manufacturing a steel strip, A steel slab drawn through the strips, a slab enclosing the steel strip so as to be shielded from the outside air and entering the galvanizing bath; A sink roll formed to immerse the steel sheet introduced through the Snout into the zinc plating solution; A stabilizing roll for stabilizing the steel plate passed through the sink roll and discharging the stabilized steel plate to the upper part of the galvanizing bath; And an air knife for plating the steel sheet upwardly discharged through the stabilizing roll according to a plating amount, wherein the slough is formed with a moving member capable of sliding back and forth movement by adjusting the level in the vertical direction on its outer wall surface The present invention relates to a dross removing apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a dross removing device according to one embodiment of the present invention will be described in detail with reference to the drawings.

1 is a schematic cross-sectional view of a dross removal apparatus 100 according to one embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of an upper section of a dross removal apparatus 100 according to one embodiment of the present invention. Fig.

1 and 2, the dross removing apparatus 100 of the present invention includes a strip 30, a slough 40, a sink roll 60, a stabilizing roll 70, and an air knife 80. [ And a moving member 50 is formed on the snout 40.

Hereinafter, each component of the dross removing apparatus according to one embodiment of the present invention will be described in detail.

The strip 30 is passed through an air knife 80 to remove the dross 15 on the surface while passing the steel sheet through the slats 30 and passing the galvanizing bath 20 at a constant speed .

The slats 40 can be inserted into the galvanizing bath 20 while enclosing the steel sheet introduced through the strip 30 so as to be shielded from external air. At this time, a moving member 50 is formed on the surface of the outer wall of the snout 40 so as to be reciprocally movable by adjusting the level in the vertical direction, which will be described later.

The sink roll 60 immerses the steel sheet introduced through the slats 40 into the zinc plating solution 10 and the galvanized steel sheet passes through the sink roll 40, And is conveyed to the rising roll 70.

The stabilizing roll 70 stabilizes the steel sheet passed through the sink roll 60 and can be discharged to the upper portion in contact with the atmosphere of the zinc plating bath 20. [ At this time, the dross 15 adsorbed and grown on the outer wall of the snout 40 may interfere with the scraper driving of the stabilizing roll 70, interfere with the steel sheet, and cause plating failure.

The air knife 80 can plate the steel sheet discharged upward through the stabilizing roll 70 according to a desired plating amount. At this time, according to the air flow of the air knife 80, the dross 15 moves to the outer wall of the snout 40, the flow is stagnated and the outer wall of the snout 40 can be hardened. At this time, if the dross is not removed immediately, it is adsorbed on the outer wall of the snout 40 and continues to accumulate with time and grow along the outer wall wall. These drosses (15) are very difficult to remove due to their high hardness, which causes serious problems such as poor plating and uniformity of the surface of the steel sheet.

3 is a cross-sectional view schematically showing the moving member 50 of the dross removing apparatus 100 according to one embodiment of the present invention. Fig. 4 is a cross-sectional view schematically illustrating the dross removing apparatus 100 Sectional view schematically showing the moving member 50 of FIG.

3 to 4, the moving member 50 includes a cylinder portion 51, a control portion 53, and a blocking film 55, and is provided with a first and a second movable member 50, And the like can be formed. Hereinafter, each component of the moving member will be described in detail.

The cylinder portion 51 may be formed on the outer wall surface of the snout 40 to support the blocking film 55. In particular, the cylinder portion 51 is located on the upper surface of the outer wall surface of the snout 40, and a plurality of the first and second cylinder portions may be formed. It is possible to more easily remove the strong hardness dross 15 which is not easily removed through the support shaft of the cylinder portion 51.

The control part 53 is formed on the bottom surface of the cylinder part 51, and can slide and move the barrier film 55 in the vertical direction. That is, the control unit 53 adjusts the level of the outer wall surface of the snout 40 to induce the driving of the blocking film 55, and a plurality of the first and second control units may be formed. In particular, the control unit 53 may manually adjust the level of the shielding film by manually adjusting the drows 15 on the outer wall of the Snout, such as a remote controller or a control unit, or by setting intermittent periods. In addition, the flow of the dross 15 adsorbed on the outer wall surface of the snout 40 can be quickly captured through the level adjustment and the vertical direction driving of the control unit 53, thereby facilitating the removal.

The blocking membrane 55 may be formed on the bottom surface of the control unit 53 to absorb and remove the dross 15 flowing into the outer wall of the snout 40 to be removed by dipping. More specifically, when the dross 15 is adsorbed on the surface of the blocking film 55 during the operation, the blocking film 55 is level-adjusted by the controller 53 in the vertical direction, 20 so that the adsorbed droplets 15 can be remelted and re-dissolved to be efficiently removed without any manual work of the operator.

The shielding film 55 may have a U-shaped shape with a protruding central portion. By having a protruding shape with an internal space as described above, it is possible to prevent the risk of directly removing the dross between the air knife 80 and the snout 40. That is, it is possible to carry out the outer frame work very safely outside the galvanizing bath 20. Particularly, since the dross 15 flows to the left and right edge portions by having the U shape, the dross 15 and other sludge can be quickly and easily removed from the side surface of the zinc port. In addition, it is possible to prevent the adsorption phenomenon phenomenon at the end portion of the blocking film 55 by immediately removing the dross 15 from the outer wall surface of the Snout 40.

Since the barrier film 55 is immersed in the high-temperature galvanizing bath 20 at a temperature of about 460 DEG C for a long time, erosion may occur and deformation may occur at a high temperature even if a SUS-based material is used. The shielding film 55 according to one embodiment of the present invention is capable of attaching and detaching only the shielding film 55 itself to the moving member 50 whose level can be adjusted in the vertical direction. This makes it easy to replace with a new barrier after a certain period of use and maintains the reliability of the equipment continuously.

Although not shown in the drawings, the dross removing apparatus according to one embodiment of the present invention may further include a driving motor unit (not shown) for adjusting the moving speed of the cylinder unit, the control unit, and the shielding film.

As described above, the dross removing device according to one embodiment of the present invention can easily remove the dross floating between the screw and the air knife in the galvanizing bath, and can solve the problem of dross surface adhesion to the outer surface of the screw And the dross partially adsorbed on the surface of the barrier film caused by the level change of the galvanizing bath can be efficiently removed by a separate moving member capable of adjusting the level in the vertical direction without any additional work, By reducing the specific gravity, it prevents worker's safety accident and various disasters caused by hot heat of galvanizing bath, prevents dross penetration into steel sheet by suspension control floating around air knife, and improves surface quality And securing the cleanliness of facilities such as Snout, it increases the lifespan of the equipment and reduces cost It can hyeonhal.

De los  How to uninstall

According to another aspect of the present invention, there is provided a method of manufacturing a steel sheet, comprising: preparing a steel sheet and introducing the steel sheet along a strip; The steel sheet was taken in a galvanizing bath and discharged through an air knife through a sink roll; And removing the dross which is oxidized and discharged by the air knife through a moving member, wherein the dross removing is performed by moving the movable knife in a vertical direction through a control unit of a moving member formed on an outer wall surface of the snout, And the dross which is introduced is adsorbed on the barrier film and is intercepted and immersed to remove the dross.

Hereinafter, the dross removing method according to one embodiment of the present invention will be described in detail.

5 is a process flow chart schematically showing a dross removal method according to one embodiment of the present invention.

Referring to FIG. 5, the dross removing method includes a Snooth-in step S100 of a steel plate; Discharging to the air knife (S200), and a dross removing step (S300).

Snooth-in of steel

The Snooth-in step (S100) of the steel sheet is carried out for the purpose of galvanizing the steel sheet by inserting the steel sheet through the strip to be surrounded by the outside air.

The steel sheet is immersed in a zinc plating solution through Snooth-in, and the galvanized steel sheet is sequentially conveyed through a strip to a sink roll and a stabilizing roll. And then discharged to the upper portion in contact with the atmosphere of the galvanizing bath. At this time, the dross grown by adsorption on the outer wall of the Snart may interfere with the scraper driving of the stabilizing roll, interfere with the steel sheet, and cause plating defects.

Exhaust by air knife

The air knife discharging step S200 is performed for plating the steel sheet discharged upward through the stabilizing roll according to a desired plating amount.

According to the air flow of the air knife, the dross is moved to the outer wall of the snout, the flow is stagnated and the outer wall surface is hardened. At this time, if the dross is not removed immediately, it is adsorbed on the outer wall of Snooth and continues to accumulate and grow along the wall surface of the outer wall. Since such dross is very hard, it is difficult to remove and plating can cause serious problems such as poor plating and uniformity of the surface of the steel sheet .

Remove dross

The dross removing step S300 is performed for the purpose of effectively removing dross floating between the Snout and the air knife in the galvanizing bath, as described above.

As described above, the drawstock moves to the outer wall surface of the Snart, and the flow stagnates and hardens on the outer wall surface, which can cause problems. At this time, in order to remove the dross, the shielding film is level-adjusted in the vertical direction through the control unit of the moving member to slide back and forth, thereby partially dipping the shielding film into the inside of the galvanizing bath so that the droplets adsorbed on the surface are reused and re- It can be efficiently removed without any manual work of the operator.

The shield has a U-shaped configuration with a protruding central portion so that the risk of directly removing the dross between the air knife and the snout can be avoided and an immediate dross removal on the outer surface of the snout can be avoided It is possible to prevent the adsorption phenomenon phenomenon at the end portion of the shielding membrane. In addition, since the barrier membrane is immersed in the hot zinc plating bath for a long time to cause defects, the barrier membrane has a detachable function of only the barrier membrane itself and can be easily replaced with a new barrier membrane after a certain period of use.

The method of removing dross according to one embodiment of the present invention can easily remove dross floating between a snout and an air knife in a zinc plating bath and can prevent the problem of dross surface adhesion to the outer surface of a Snart, It is possible to efficiently remove the partially adsorbed dross on the surface of the barrier film caused by the level change of the zinc plating bath without any additional work and to reduce the specific gravity of the manual removal of dross, It prevents worker's safety accident and various disasters caused by high temperature heat of plating bath, prevents dross from entering into steel plate through suspension control floating around air knife, improves surface quality, By ensuring the cleanliness of the equipment, it is possible to increase the service life of the equipment and realize the cost reduction effect such as the cost reduction.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Example 1

A steel sheet was prepared, drawn along a strip, drawn into a galvanizing bath, discharged through an air knife through a sink roll, and dross discharged and oxidized by the air knife was removed through a moving member. At this time, the dross removal is adjusted by adjusting the level in the vertical direction through the control part of the moving member formed on the outer wall surface of the snout, so that the dross which is flowing while sliding back and forth is adsorbed on the blocking membrane, The results of zinc adsorption growth measured thereby are shown in Table 1 below.

Comparative Example 1

A steel plate is prepared, drawn along a strip, drawn into a galvanizing bath, discharged through an air knife through a sink roll, and dross discharged by the air knife is discharged to a worker using a shovel removing tool And directly removed from the top of the galvanizing bath. The results of zinc adsorption growth measured thereby are shown in Table 1 below.

Example 1 Comparative Example 1 How to Remove Dross Use movable barrier membrane etc. Manually remove Zinc adsorption / growth Outer wall 10 mm 200mm or more outside wall Exchanging periods 1 time / 60 days 1 time / 22 days Stabilizing roll
Interference Interference prevention
(Breakage X) Interference
(1 damage / 5 months)

Measurement result

6 is a cross-sectional view schematically showing a dross removing apparatus according to Comparative Example 1 of the present invention. 6, when the operator directly removed the dross from the upper part of the zinc plating bath using a shovel removing tool, the dross was grown to 200 mm or more on the outer wall of the Drosugnaunt as in Comparative Example 1, , And it can be seen that there is a problem that the stirling roll device (arm) is interfered and broken once in about 5 months.

On the other hand, as in Embodiment 1, according to one embodiment of the present invention, it can be seen that when the dross is removed by a blocking film or the like using the moving member, the dross is grown to about 10 mm on the outer wall of the outer wall, Compared with the case of Comparative Example 1 in which the dross was removed, there was a margin of about once per 60 days, and there was no interference with the stabilizing roll unit (arm), and almost no breakage occurred. Able to know.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims as well as the appended claims.

10 Zinc amount 11 Removal tool
13 Worker 15 Dross
20 galvanized bathtubs 30 strips
40 Snout 50 moving member
51 Cylinder part 53 Control part
55 Barrier 60 Sink Roll
70 Stabilizing Roll 80 Air Knife

Claims (6)

A strip for feeding the steel sheet;
A steel slab drawn through the strips, a slab enclosing the steel strip so as to be shielded from the outside air and entering the galvanizing bath;
A sink roll formed to immerse the steel sheet introduced through the Snout into the zinc plating solution;
A stabilizing roll for stabilizing the steel plate passed through the sink roll and discharging the stabilized steel plate to the upper part of the galvanizing bath; And
And an air knife for plating a steel sheet discharged upward through the stabilizing roll according to a plating amount,
The slider is provided with a moving member capable of sliding back and forth by adjusting the level in the vertical direction on its outer wall surface,
The moving member includes: a cylinder portion formed on an outer wall surface of the snout to support a shielding film;
A control part formed on a bottom surface of the cylinder part and driving the shielding film in a vertical direction to reciprocate the slide; And
And a shielding layer formed on a bottom surface of the control unit and adapted to adsorb the dross introduced into the outer wall of the snout, to block the dross, to dope the dross, and to remove the dross.
delete The method according to claim 1,
Wherein the shielding film has a U-shaped shape with a protruding central portion.
The method according to claim 1,
Wherein the barrier film is detachable.
Prepare a steel sheet and pull it along the strip into the snare;
The steel sheet was taken in a galvanizing bath and discharged through an air knife through a sink roll; And
Removing the dross oxidized and discharged by the air knife through the moving member;
Lt; / RTI >
The dross removal is carried out by adjusting the level in the vertical direction through the control unit of the moving member formed on the outer wall surface of the snout so as to reciprocate the slide, To remove the dross.
6. The method of claim 5,
Wherein the shielding film has a U-shaped shape with a central portion protruding therefrom.
KR1020150116787A 2015-08-19 2015-08-19 Apparatus for removing dross and, method for removing dross using the same KR101670183B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230151299A (en) * 2022-04-25 2023-11-01 주식회사 포스코 Device for removing dross of snout

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08127852A (en) * 1994-10-31 1996-05-21 Kawasaki Steel Corp Snout of continuous hot-dipping device
KR20100073722A (en) * 2008-12-23 2010-07-01 주식회사 포스코 Apparatus for preventing dross from attaching to zinc pot roll

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08127852A (en) * 1994-10-31 1996-05-21 Kawasaki Steel Corp Snout of continuous hot-dipping device
KR20100073722A (en) * 2008-12-23 2010-07-01 주식회사 포스코 Apparatus for preventing dross from attaching to zinc pot roll

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230151299A (en) * 2022-04-25 2023-11-01 주식회사 포스코 Device for removing dross of snout
KR102638194B1 (en) * 2022-04-25 2024-02-16 주식회사 포스코 Device for removing dross of snout

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