KR102466722B1 - Device for removing dross of galvanized bath and hot-dip galvanizing equipment including the same - Google Patents

Abstract

The present invention relates to a dross removal device in a galvanizing bath capable of removing dross floating on the molten surface of a plating bath containing hot-dip zinc during the production process of a hot-dip galvanized steel sheet, and to a hot-dip galvanizing facility including the same, ) shape, and is installed to be movable in the front-back direction or up-down direction based on the process direction of the strip on both sides of a plating bath in which molten zinc for plating a strip is accommodated during the production process of the hot-dip galvanized steel sheet, It may include a blade bar for removing dross floating on the molten surface of the plating bath, a drive unit for driving the blade bar forward and backward or up and down, and a control unit for controlling the drive unit.

Description

Device for removing dross of galvanizing bath and hot-dip galvanizing equipment including the same}

The present invention relates to a dross removal device in a galvanizing bath and a hot-dip galvanizing facility including the same, and more particularly, to remove dross floating on a molten surface of a plating bath containing hot-dip zinc during a production process of a hot-dip galvanized steel sheet. It relates to a dross removal device in a galvanizing bath and a hot-dip galvanizing facility including the same.

The hot-dip galvanizing facility is a molten metal facility that coats a zinc film on the surface of a high-temperature strip by melting zinc ingots in a molten state at a temperature of 450 degrees or more to coat the surface of a high-temperature strip with a zinc film. In such a hot-dip galvanizing facility, zinc oxidation due to contact with the discharged wiping air of the air knife flowing to the molten metal surface after colliding with the surface of the vertical strip and the temperature difference with the outside air causes a top layer of zinc solidified on the molten surface of the plating bath. Top Dross always occurs. In particular, as various alloy elements such as aluminum, manganese, and silicon are added to enhance corrosion resistance and surface quality of plating strips, the amount of top dross generated by external factors (temperature difference, oxidation due to wiping gas contact, etc.) greatly increases will do

This top dross floats on the molten surface of the plating bath, adheres to the surface of the plating strip again, and is scattered by air colliding with the surface of the strip during the gas wiping process of the air knife. This is the main cause of defects on the plating surface. The dross precipitated at the bottom of the plating bath penetrates between the sink roll and the strip, causing plating surface defects and sink roll surface damage.

However, in the conventional dross removal device of the galvanizing bath, various methods have been tried, such as collecting top dross by floating a specific floating facility on the bath surface and installing a guide near the air knife. There was a problem of reducing the skimming efficiency of the operator by narrowing the space. In addition, there were various problems, such as difficult facility management due to the hardening of the top dross in the collection equipment or foreign matter transfer equipment, and the inability to grasp the operation status of the upper part of the plating tank due to the huge facility structure.

The present invention is to solve various problems, including the above problems, by pushing the dross in the section on both sides of the plating bath, where the dross is relatively adhered due to the relatively narrow space in the plating bath, to the front and rear of the plating bath. It is an object of the present invention to provide a dross removal device of a galvanizing bath that can more easily help a worker or robot remove dross from the front or rear part of the bath, and a hot-dip galvanizing facility including the same. However, these tasks are illustrative, and the scope of the present invention is not limited thereby.

According to one embodiment of the present invention, a dross removal apparatus for a galvanizing bath is provided. The dross removal device of the galvanizing bath is formed in a bar shape, and the processing direction of the strip is based on both sides of the plating bath containing the molten zinc for plating the strip during the production process of the hot-dip galvanized steel sheet. a blade bar installed to be movable forward and backward or up and down to remove dross floating on the bath surface of the plating bath; a driving unit for driving the blade bar in a forward and backward direction or a vertical direction; and a control unit controlling the driving unit.

According to one embodiment of the present invention, the blade bar has a snout for guiding the strip into the plating bath and the thickness of the molten zinc attached to the strip passing through the plating bath. It can move in the front-rear direction or up-down direction in the area between the air knife for adjusting and the side wall of the plating bath.

According to one embodiment of the present invention, the control unit controls the driving unit when removing the dross floating on the molten surface of the plating bath to raise or lower the blade bar so that at least a portion of the blade bar is exposed to the outside of the molten surface. After that, the blade bar may be moved forward or backward so that the dross can be transferred to the front or rear side of the plating bath where the worker is located.

According to one embodiment of the present invention, the control unit controls the drive unit to prevent the molten zinc from being solidified and attached to the portion of the blade bar exposed to the outside of the molten surface of the plating bath, so as to control the driving unit at predetermined time intervals. The blade bar may be lowered below the molten metal surface of the plating bath.

According to one embodiment of the present invention, the driving unit, a horizontal driving body for driving the blade bar in the front and rear directions; and a vertical actuator installed on a sidewall of the plating bath to drive the horizontal actuator in a vertical direction.

According to one embodiment of the present invention, the driving unit includes a circulation driving body installed on the sidewall of the plating bath and formed as a belt driving body or a chain driving body to circulate and drive the blade bar in a closed loop. can do.

According to an embodiment of the present invention, the blade bar may be movably installed in a cantilever shape on a sidewall of the plating bath to be movable in a front-back direction or a vertical direction.

According to one embodiment of the present invention, the blade bar may include a heater installed inside the blade bar to heat the blade bar to a predetermined temperature so as to prevent the molten zinc from being solidified and attached. have.

According to another embodiment of the present invention, a hot-dip galvanizing facility is provided. The hot-dip galvanizing equipment includes a plating bath in which hot-dip zinc is accommodated; a snout having one side connected to a heating facility and having the other side immersed in the molten surface of the plating bath to introduce the strip heat-treated in the heating facility into the plating bath; an air knife installed above the plating bath to adjust the thickness of the molten zinc attached to the strip passing through the plating bath; and a dross removal device in the galvanizing bath.

According to one embodiment of the present invention made as described above, by pushing the dross in the section on both sides of the plating bath to the front and rear of the plating bath, where the dross is relatively adhered due to the relatively narrow space in the plating bath, It is possible to help a worker or robot more easily remove dross from the rear part.

In addition, it is possible to reduce the level deviation of the plating bath due to the reduction of the operator's manual skimming area, and to increase work efficiency by skimming only in the front or rear part of the plating bath where the operator has a relatively large working space. A dross removal device in a galvanizing bath having a high efficiency dross removal effect at low cost and a hot-dip galvanizing facility including the same can be implemented. Of course, the scope of the present invention is not limited by these effects.

1 is a process chart schematically showing a manufacturing process of a hot-dip galvanized steel sheet according to an embodiment of the present invention.
FIG. 2 is a perspective view schematically illustrating a hot-dip galvanizing facility in the manufacturing process of the hot-dip galvanized steel sheet of FIG. 1 .
FIG. 3 is a plan view schematically showing a dross removal device of a galvanizing bath installed in the hot-dip galvanizing equipment of FIG. 2 .
4 and 5 are front views illustrating embodiments of the dross removal device of the galvanizing bath of FIG. 3;

Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in many different forms, and the scope of the present invention is as follows It is not limited to the examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation.

Hereinafter, embodiments of the present invention will be described with reference to drawings schematically showing ideal embodiments of the present invention. In the drawings, variations of the depicted shape may be expected, depending on, for example, manufacturing techniques and/or tolerances. Therefore, embodiments of the inventive concept should not be construed as being limited to the specific shape of the region shown in this specification, but should include, for example, a change in shape caused by manufacturing.

1 is a process diagram schematically showing a manufacturing process 1000 of a hot-dip galvanized steel sheet according to an embodiment of the present invention, and FIG. 2 is a hot-dip galvanizing facility in the manufacturing process 1000 of a hot-dip galvanized steel sheet of FIG. It is a perspective view schematically showing. 3 is a plan view schematically showing the dross removal device 100 of the galvanizing bath installed in the hot-dip galvanizing facility of FIG. 2, and FIGS. 4 and 5 are the dross removal device 100 of the galvanizing bath of FIG. 200) are front views showing the embodiments.

First, as shown in FIG. 1 , the equipment for manufacturing a hot-dip galvanized steel sheet according to an embodiment of the present invention includes a welding facility 600, a heating facility 700, and a rolling facility 800. ), a post-processing facility 900, a plating bath 300, a snout 400, and an air knife 500.

As shown in FIG. 1, after cold rolling or hot rolling, the coiled steel sheet is mounted on the payoff reel (C1), and welding between the preceding and following strips (S) is completed through the welding facility 600, and the strip (S) may be heat treated in a heating facility 700 to secure desired material strength and plating adhesion during hot-dip galvanizing.

Subsequently, the heat-treated strip S may be introduced into the plating bath 300 of the hot-dip galvanizing facility while being maintained at an appropriate temperature for the hot-dip galvanizing process. At this time, in order to prevent oxidation of the surface of the strip S caused by exposure of the strip S subjected to high temperature heat treatment to the atmosphere and consequent plating peeling, it may be introduced through the snout 400, which is a strip inducing facility. have.

More specifically, the snout 400 has one side connected to the heating facility 700 and the other side immersed in the bath surface of the plating bath 300 to heat-treat the strip S in the heating facility 700 in the plating bath ( 300) can be introduced. The inside of the snout 400 may be filled with an inert gas (HNx) to prevent plating peeling due to oxidation of the surface of the strip (S).

Subsequently, the strip S passing through the snout 400 is plated in the plating bath 300 in which the molten zinc Z is accommodated, and then installed above the plating bath 300 and attached to the strip S. The coating amount may be adjusted to a preset thickness by the air knife 500 for adjusting the thickness of zinc (Z).

In this way, the plated strip (S) can be manufactured with a beautiful surface through temper rolling in the rolling facility 800, and then post-processing including a shape corrector and a post-processing to secure corrosion resistance and a cutter It can be finalized by being wound around the tension reel C2 through the facility 900.

[0022] To describe the hot-dip galvanizing facility in the manufacturing process of such a hot-dip galvanized steel sheet in more detail, as shown in FIG. The strip S may be introduced into the plating bath 300 in which the molten zinc Z is accommodated through the naut 400 .

And, by the sink roll (R1) immersed in the plating bath 300 and the stabilizing roll (R2) installed directly above the strip (S), the pass line is the plating bath ( 300), it can be continuously transferred while being vertically changed. Through this process, the molten zinc (Z) accommodated in the plating bath 300 may be attached to the surface of the strip (S).

Thereafter, the strip (S) passing through the sink roll (R1) is corrected for warpage while passing between a pair of stabilizing rolls (R2) installed directly above it, and is molten zinc ( The surface adhesion amount of Z) can be controlled.

In such a hot-dip galvanizing facility, metal oxidation by contact with the air of the air knife 500 flowing to the bath surface of the plating bath 300 after collision with the surface of the strip (S) transported in the vertical direction due to the temperature difference with the outside air Due to such factors, dross is generated on the molten surface of the plating bath 300 .

As shown in FIG. 3, metal pumps 410 are installed on both sides of the snout 400, and these metal pumps 410 are partially immersed in the metal surface of the plating bath 300 and operated, and the strip (S ) can be used for the purpose of transferring the molten zinc (Z) contained in the plating bath 300 to another plating bath or removing floating matters such as ash during the plating process.

As described above, in the hot-dip galvanizing facility, the space on both sides of the plating bath 300 is relatively narrow due to the snout 400 and the metal pumps 410 installed on both sides of the snout 400, so that the dross D is relatively adhered. can

When the dross D is stuck in such a narrow section A, the worker W may have to move to the sidewall 310 of the plating bath 300 and perform skimming work. However, in the case of the front part 320 and the rear part 330 of the plating bath 300, the working space is wide, so that the worker W can easily access it, and the front part 320 of the plating bath 300 can be formed by using a robot. And the dross D of the rear part 330 can be easily removed, but the side part 310 of the plating bath 300 has a narrow working space, making it difficult for the operator W to enter and using a robot. there was.

Accordingly, by using the dross removal device 100 of the galvanizing bath of the present invention, the dross D in the section of the side part 310 of the plating bath 300, where the dross D is relatively adhered, is removed from the plating bath. By pushing to the front part 320 or the rear part 330 of the 300, it is possible to help the operator W or the robot more easily remove the dross D.

More specifically, as shown in FIG. 4, the dross removal device 100 of a galvanizing bath according to an embodiment of the present invention largely includes a blade bar 110, a driving unit 120, and a control unit (not shown). can include

The blade bar 110 is formed in a straight bar shape, and is formed on both sides of the plating bath 300 in which the molten zinc (Z) for plating the strip (S) is accommodated during the production process of the hot-dip galvanized steel sheet. It is installed to be movable in the forward and backward directions or up and down directions based on the process direction of (S), and the dross (D) floating on the bath surface of the plating bath 300 can be removed.

For example, the blade bar 110 may be installed on the sidewall 310 of the plating bath 300 to be movable in a forward-backward direction or up-down direction in a cantilever shape by a driving unit 120 to be described later. More specifically, the blade bar 110 is a region (A) between the snout 400 and the air knife 500, which are shaded areas of the plating bath 300, and the sidewall portion 310 of the plating bath 300. You can move forward or backward or up and down in

For the blade bar 110, it is preferable to use an STS316 grade stainless material to improve the service life, and the service life can be further increased through additional W/C coating. In addition, since the area of the narrow section on both sides of the plating bath 300 may be different for each production line of the hot-dip galvanized steel sheet, the length of the blade bar 110 may be adjusted according to the circumstances of each production line.

As shown in FIG. 4 , the drive unit 120 drives the blade bar 110 in the forward and backward directions or up and down directions, and a control unit (not shown) electrically connected to the drive unit 120 controls the drive unit 120. can do.

More specifically, the driving unit 120 is installed on the horizontal driving body 121 for driving the blade bar 110 in the forward and backward directions and the side wall portion 310 of the plating bath 300 to move the horizontal driving body 121 up and down. By the vertical driving body 122 driven in the direction, the blade bar 110 can be driven in the front-back direction or up-and-down direction. The horizontal driving body 121 and the vertical driving body 122 may be applied with a wide variety of driving devices capable of reciprocating the blade bar 110 in a straight direction, such as a linear actuator.

Therefore, the control unit controls the driving unit 120 when the dross D floating on the molten surface of the plating bath 300 is removed, so that at least a portion of the blade bar 110 is exposed to the outside of the molten metal surface. 110) is raised or lowered, the blade bar 110 is moved forward or down so that the dross D can be transferred to the front part 320 or the rear part 330 of the plating bath 300 where the operator W is located. can backtrack.

In addition, the control unit controls the drive unit 120 to lower the blade bar 110 down the molten metal surface of the plating bath 300 at predetermined time intervals and then raise it again after a predetermined time, so that the plating bath of the blade bar 110 It is possible to prevent the molten zinc (Z) from being solidified and attached to the portion exposed to the outside of the molten surface of (300). In addition, although not shown, a heater is installed inside the blade bar 110 to continuously maintain the blade bar 110 at a predetermined heating temperature, so that the molten zinc (Z) is solidified and attached to the blade bar 110. can also be prevented.

In addition, like the dross removal device 200 of a galvanizing bath according to another embodiment of the present invention shown in FIG. The member 123a may be a circular driving body 120 that is formed as a belt driving body or a chain driving body having a closed loop and circulating and driving the blade bar 110 in a closed loop.

As such, when the blade bar 110 is circularly driven in a closed loop by the circulation driving body 120, the plating bath is periodically driven while the blade bar 110 is driven forward or backward without separate control by the control unit. By descending below the molten metal surface of 300, it is possible to prevent the molten zinc (Z) from being solidified and attached to the blade bar 110.

Therefore, in the dross removal devices 100 and 200 of the galvanizing bath according to various embodiments of the present invention and the hot-dip galvanizing facility including the same, the space in the plating bath 300 is relatively small, so that the dross D By pushing the dross D of both sides of the plating bath 300 to the front and rear of the plating bath 300, where the dross D is relatively adhered, the worker W or the robot's dross is Loss (D) can be more easily removed.

Therefore, the dross removal devices 100 and 200 of the galvanizing bath according to various embodiments of the present invention and the hot-dip galvanizing facility including the same, the reduction of the plating bath 300 due to the manual skimming area reduction of the worker W It is possible to increase work efficiency by reducing the level deviation and skimming work only on the front part 320 or the rear part 330 of the plating bath 300, where the operator W has a relatively wide working space, and a facility having a simple structure. It can have a high-efficiency dross removal effect at a low cost.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100, 200: dross removal device in galvanizing bath
110: blade bar
120: driving unit
300: plating bath
310: side wall
320: front part
330: rear part
400: snout
500: air knife
600: welding facility
700: heating facility
800: rolling equipment
900: post-processing facility
D: dross
Z: molten zinc
S: strip
1000: Hot-dip galvanized steel sheet manufacturing process

Claims (9)

It is formed in the shape of a bar and is movable in the forward direction or up and down direction based on the process direction of the strip on both sides of the plating bath in which the molten zinc for plating the strip is accommodated during the production process of the hot-dip galvanized steel sheet. a blade bar installed to remove dross floating on the molten surface of the plating bath;
a driving unit for driving the blade bar in a forward and backward direction or a vertical direction; and
Including; a control unit for controlling the driving unit;
The control unit,
When the dross floating on the molten surface of the plating bath is removed, the driving unit is controlled to raise or lower the blade bar so that at least a portion of the blade bar is exposed to the outside of the molten surface, and then the front or rear portion of the plating bath where the worker is located Advance or reverse the blade bar so that the dross can be transferred to
In order to prevent the molten zinc from being solidified and attached to the portion of the blade bar exposed to the outside of the molten surface of the plating bath, the driving unit is controlled to lower the blade bar below the molten surface of the plating bath at predetermined time intervals, and then rise again after some time,
the driving unit,
a circulation driving body installed on a sidewall of the plating bath and formed as a belt driving body or a chain driving body to circulate and drive the blade bar in a closed loop;
A dross removal device for a galvanizing bath, comprising: According to claim 1,
The blade bar,
A snout for guiding the strip into the plating bath, an air knife for adjusting the thickness of the molten zinc attached to the strip passing through the plating bath, and a side wall of the plating bath A dross removal device in a galvanizing bath that moves in a forward-backward or up-and-down direction in the region between the parts. delete delete delete delete According to claim 1,
The blade bar,
A dross removal device of a galvanizing bath, which is installed on a sidewall of the plating bath to be movable in a forward-backward or up-down direction in a cantilever shape. According to claim 1,
The blade bar,
a heater installed inside the blade bar to heat the blade bar to a predetermined temperature so as to prevent the molten zinc from being solidified and adhered;
A dross removal device for a galvanizing bath, comprising: A plating bath containing molten zinc;
a snout having one side connected to a heating facility and the other side immersed in the molten surface of the plating bath to introduce the strip heat-treated in the heating facility into the plating bath;
an air knife installed above the plating bath to adjust the thickness of the molten zinc attached to the strip passing through the plating bath; and
a dross removal device for a galvanizing bath according to any one of claims 1, 2, 7 and 8;
Containing, hot-dip galvanizing equipment.

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