KR101753597B1 - Inoxidizable gas wiping apparatus - Google Patents

Inoxidizable gas wiping apparatus Download PDF

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Publication number
KR101753597B1
KR101753597B1 KR1020150111547A KR20150111547A KR101753597B1 KR 101753597 B1 KR101753597 B1 KR 101753597B1 KR 1020150111547 A KR1020150111547 A KR 1020150111547A KR 20150111547 A KR20150111547 A KR 20150111547A KR 101753597 B1 KR101753597 B1 KR 101753597B1
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KR
South Korea
Prior art keywords
gas
air knife
nozzle body
side wall
upper cover
Prior art date
Application number
KR1020150111547A
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Korean (ko)
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KR20170018224A (en
Inventor
전지연
이상원
최재혁
이필종
Original Assignee
주식회사 포스코
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Priority to KR1020150111547A priority Critical patent/KR101753597B1/en
Publication of KR20170018224A publication Critical patent/KR20170018224A/en
Application granted granted Critical
Publication of KR101753597B1 publication Critical patent/KR101753597B1/en

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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
    • C23C2/14—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
    • C23C2/04—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
    • 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
    • C23C2/34—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

A non-oxidizing gas wiping device is disclosed. The non-oxidizing gas wiping apparatus according to an embodiment of the present invention includes an air knife disposed on both sides of a steel plate discharged upward from a plating port, an upper cover disposed to cover an upper portion of the air knife and having an outlet through which a steel plate is discharged, And a gas injector disposed along the inner periphery of the cover and forming a non-oxidizing atmosphere around the air knife by surrounding the air knife by squeezing a sealing gas toward the surface of the plating liquid in the plating port.

Description

INOXIDIZABLE GAS WIPING APPARATUS [0001]

The present invention relates to a non-oxidizing gas wiping apparatus, and more particularly, to a non-oxidizing gas wiping apparatus for surrounding an air knife to form a non-oxidizing atmosphere.

Hot dip galvanizing (GI) steel sheet or galvannealed hot dip galvanized (GA) steel sheet is produced by putting a rolled hard material into a plating process, removing rolling oil through degreasing, recrystallizing heat treatment in a continuous annealing furnace, passing through a hot dip galvanizing bath So that the surface is plated with molten zinc.

At this time, the adhered amount of the hot-dip coated steel sheet is adjusted by a method in which molten zinc on the surface of the steel sheet vertically rising through the plating bath is wiped off by air or inert gas.

In general, the wiping pressure increases as the deposition amount decreases and increases as the line speed increases. When the wiping pressure is increased, the oxygen in the air injected reacts strongly with the molten zinc adhering to the surface of the steel sheet, and the flow of the air to be wiped is lowered by the steel plate and bombarded with molten zinc on the upper surface of the bath, And in this process, it reacts strongly with molten zinc to form a lot of oxides. Particularly, oxides formed by the combination of zinc and oxygen have a low specific gravity and float on the surface of the hot-dip galvanizing solution.

In order to suppress the formation of an oxide film on the plating surface layer portion, there is known a configuration in which a sealing box is provided as means for blocking oxygen near the gas wiping.

However, since the sealing box has a structure wrapping up to the lower portion of the gas wiping device, it is difficult to discharge and remove the dross, and the gas wiping device may fail due to the increased ambient temperature due to the shielding.

Korean Published Patent No. 2011-0127917 (Published on November 28, 2011)

Embodiments of the present invention are intended to provide a non-oxidizing gas wiping device that is easy to discharge dross and can reduce the temperature rise due to shielding.

According to an aspect of the present invention, there is provided an air knife, comprising: an air knife disposed on both sides of a steel sheet discharged from a plating port upward; an upper cover disposed to cover an upper portion of the air knife and having an outlet through which the steel plate is discharged; And a gas injection device disposed along the periphery of the air knife and forming a non-oxidizing atmosphere around the air knife by surrounding a side of the air knife by ejecting a sealing gas toward the surface of the plating liquid in the plating port, A device may be provided.

The upper cover may include an upper wall formed with the outlet and a side wall extending downward from the upper wall, and the side wall may be formed so as not to cover the air knife located below the upper wall.

The gas spraying apparatus may further include a nozzle body extending along a circumferential direction of the sidewall spaced apart from the upper cover by a predetermined distance, and between the nozzle body and the sidewall, An exhaust flow path can be formed.

The upper cover may move in conjunction with the air knife.

Further, the sealing gas includes nitrogen gas.

Further, the nozzle body may receive the wiping gas from a gas supply source that supplies wiping gas to the air knife and discharge the wiping gas downward.

The embodiments of the present invention can form a non-oxidizing atmosphere by surrounding the air knife by the upper cover and the sealing gas, thereby facilitating the discharge of the dross and preventing the temperature rise that may occur during the shielding.

1 schematically shows a non-oxidizing gas wiping device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a non-oxidizing gas wiping apparatus according to an embodiment of the present invention. FIG.
FIG. 3 is an enlarged view of a portion A in FIG.
4 is an operational state diagram of a non-oxidizing gas wiping apparatus according to an embodiment of the present invention.
FIG. 5 shows the flow of a non-oxidizing gas wiping device according to an embodiment of the present invention.
FIG. 6 is a graph showing the oxygen concentration when the non-oxidizing gas wiping apparatus according to the embodiment of the present invention is used.
FIG. 7 shows the internal temperature when the gas-freezing wiping device and the sealed box according to the embodiment of the present invention are used.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a schematic view of a non-oxidizing gas wiping apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view showing a non-oxidizing gas wiping apparatus according to an embodiment of the present invention, A of FIG.

1 to 3, a steel sheet 10 heat-treated in an annealing furnace (not shown) is introduced into a plating port 12 containing a plating solution such as molten zinc through a Snart 11, The plating liquid is adhered to the surface of the steel plate 10 while exiting the plating bath 12.

The plating port 12 is formed in the form of a container having an open top and a roll device 20 for controlling the guide and bending of the steel plate 10 via the plating port 12 is disposed therein.

The roll device 20 includes a sink roll 21 driven in the plating port 12 and one outer surface of the steel plate 10 disposed on the upper portion of the sink roll 21 and discharged to the upper portion via the sink roll 21 A calender roll 22 disposed between the sink roll 21 and the support roll 22 and pressing the other outer surface of the steel plate 10 from the opposite side of the support roll 22 to correct the curvature, (23).

The steel plate 10 which has entered the plating port 12 through the slats 11 is bent by the calibrating roll 23 after the advancing direction of the steel plate 10 is changed via the sink roll 21, Is guided by the support roll (22) and discharged onto the plating port (12).

The steel plate 10 discharged to the upper portion of the plating port 12 passes through the non-oxidizing gas wiping device 30 and the thickness of the plating adhered to the surface of the steel plate 10 is adjusted.

The non-oxidizing gas wiping device 30 is an apparatus for forming an anaerobic atmosphere around the air knife 40, including an air knife 40, an upper cover 50 and a gas injection device 60.

The air knife 40 faces the both sides of the steel plate 10 and adjusts the thickness of the steel plate 10 by spraying wiping gas (for example, nitrogen gas) toward the surface of the steel plate 10.

The upper cover 50 may be disposed at an upper position spaced apart from the air knife 40 by a predetermined distance to cover the upper portion of the air knife 40.

The upper cover 50 is for blocking the contact with the outside air from above the air knife 40 and includes an upper wall 51 formed with an outlet 51a through which the steel plate 10 is discharged, And a side wall 52 extending downwardly from the periphery.

The upper cover 50 can be connected to the air knife 40 through the connecting member 53 so as to be moved in conjunction with the air knife 40. [

The side wall 52 of the upper cover 50 can be extended downward to the extent that the air knife 40 is not obstructed. This is for the purpose of visually confirming the state of the air knife 40 from the outside. Thus, the side wall 52 of the upper cover 50 remains in a state in which it is not in contact with the plating liquid in the plating port 12.

The gas injector 60 is a device for spraying a sealing gas to block the inflow of outside air toward the lower space of the upper cover 50.

The gas spraying apparatus 60 is disposed along the inner periphery of the upper cover 50 and surrounds the air knife 40 by spraying a sealing gas toward the surface of the plating liquid in the plating port 12, ) To form a non-oxidizing atmosphere.

The gas injection device 60 includes a nozzle body 61 extending along the circumferential direction of the side wall 52 while spaced apart from the upper cover 50 by a predetermined distance.

A sealing gas flowing from the sealing gas supply source 62 flows through the flow path 63. The sealing gas flowing along the flow path 63 flows through the nozzle 64 at the lower side of the nozzle body 61, So that a sealing curtain is formed.

The sealing gas supplied from the sealing gas supply source 62 contains nitrogen gas.

The sealing gas supply source 62 also includes a pump for feeding nitrogen gas at a set pressure, a compression tank for storing and supplying the compressed nitrogen gas, and the like.

The sealing gas supplied through the sealing gas supply source 62 is supplied to the flow path 63 inside the nozzle body 61 through the plurality of gas pipes 65.

Alternatively, the sealing gas supplied to the nozzle body 61 may use a wiping gas supplied to the air knife 40. In this case, a separate pipe branched from a pipe for supplying wiping gas to the air knife 40 may be connected to the nozzle body 61.

An exhaust passage 70 may be formed between the side wall 52 of the upper cover 50 and the nozzle body 61.

The exhaust passage 70 forms a passage for exhausting the wiping gas ejected from the air knife 40 to the outside.

The exhaust flow path 70 includes a horizontal flow path 71 formed between the upper side wall 51 of the upper cover 50 and the nozzle body 61 and a side wall 52 of the upper cover 50 and the nozzle body 61, And a vertical flow path 72 formed between the flow paths.

Hereinafter, the operation and effect of the non-oxidizing gas wiping apparatus according to the embodiment of the present invention will be described with reference to FIG. 4 to FIG.

4, the steel sheet 10 heat-treated in the annealing furnace is introduced into the plating port 12 through which the plating solution is received through the Snart 11 and then discharged to the upper part of the plating port 12, The plating liquid adhered to the surface of the steel sheet 10 is adjusted in thickness by the wiping gas sprayed from the air knife 40.

At this time, a sealing gas is supplied to the nozzle body 61 and the supplied sealing gas is sprayed downward through the nozzle 64 of the nozzle body 61 so as to surround the side of the air knife 40, And the sealing gas sprayed from the nozzle body 61 form a non-oxidizing atmosphere around the air knife 40.

5, a low pressure is formed in the vertical flow path 72 by the pressure of the sealing gas injected downward from the nozzle body 61. Therefore, the vertical flow path 72 is formed by the wirings discharged from the air knife 40 The wiping gas discharged through the vertical flow path 72 functions to prevent the outside air from flowing into the inside.

FIG. 6 is a graph showing the oxygen concentration when the non-oxidizing gas wiping apparatus according to the embodiment of the present invention is used. As shown in FIG. 6, it can be seen that the oxygen concentration is significantly lowered in the inner space sealed by the sealing gas sprayed from the nozzle body 61. In this figure, red indicates that the oxygen content is 20%, and that the oxygen concentration drops to 0% as it approaches blue.

Accordingly, since the air is not physically shielded from the air knife 40, the air knife 40 is prevented from being blown from the outside by the sealing gas discharged from the upper cover 50 and the nozzle body 61, The dross or various foreign substances generated on the surface of the plating liquid in the plating port 12 can be easily removed.

FIG. 7 shows the internal temperature when the gas-freezing wiping device and the sealed box according to the embodiment of the present invention are used.

As shown in Fig. 7 (a), when the non-oxidizing gas wiping device 30 of the present embodiment is used, as compared with the case of using a sealed box physically shielded around the air knife 40, Is about 70 degrees lower.

Accordingly, in the case of using the non-oxidizing gas wiping device 30 of the present embodiment, it is possible to prevent malfunction of peripheral components due to temperature rise occurring when performing shielding to form a non-oxidizing atmosphere .

10: steel plate, 12: plating port,
20: roll device, 30: non-oxidizing gas wiping device,
40: air knife, 50: upper cover,
51: upper side wall, 52: side wall,
60: gas injection device, 61: nozzle body,
70: Exhaust flow path.

Claims (6)

An air knife disposed on both sides of the steel sheet discharged upward from the plating port;
An upper wall 51 formed to cover the upper portion of the air knife and having an outlet 51a through which the steel plate is discharged, a side wall 51 extending downward from the upper wall, 52); And
And a sealing gas is blown toward the surface of the plating liquid in the plating port to surround the side of the air knife to form a non-oxidizing atmosphere around the air knife And a gas injection device,
Wherein the gas injection device includes a nozzle body (61) extending along a circumferential direction of the side wall in a state of being spaced apart from the upper cover by a predetermined distance,
An exhaust passage 70 is formed between the nozzle body and the side wall for discharging the wiping gas ejected from the air knife to the outside, and the exhaust passage is formed between the upper side wall of the upper cover and the nozzle body And a vertical flow path (72) formed between the flow path (71) and a side wall of the upper cover and the nozzle body to generate a low pressure by the pressure of a sealing gas sprayed downward from the nozzle body. . delete delete The method according to claim 1,
Wherein the upper cover is movable in conjunction with the air knife. The method according to claim 1,
Wherein the sealing gas comprises nitrogen gas. The method according to claim 1,
Wherein the nozzle body receives the wiping gas from a gas supply source that supplies wiping gas to the air knife and discharges the wiping gas downward.
KR1020150111547A 2015-08-07 2015-08-07 Inoxidizable gas wiping apparatus KR101753597B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150111547A KR101753597B1 (en) 2015-08-07 2015-08-07 Inoxidizable gas wiping apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150111547A KR101753597B1 (en) 2015-08-07 2015-08-07 Inoxidizable gas wiping apparatus

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KR101753597B1 true KR101753597B1 (en) 2017-07-05

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100723125B1 (en) 2005-07-05 2007-05-30 주식회사 포스코 An Apparatus for Surrounding Circumference Gas of Air knife and Method for galvanizing steel sheet using the Same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101184493B1 (en) 2010-05-20 2012-09-19 현대하이스코 주식회사 Apparatus of wiping gas comprised in galvanized steel line with effect of preventing top dross generation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100723125B1 (en) 2005-07-05 2007-05-30 주식회사 포스코 An Apparatus for Surrounding Circumference Gas of Air knife and Method for galvanizing steel sheet using the Same

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