KR20090068039A - Apparatus and method for continuous metal coating of strip - Google Patents

Abstract

An apparatus and a method for continuously coating a steel plate are provided to form a coating layer having multiple components without modifying or changing a coating apparatus to obtain coating having various components. An apparatus(1) for continuously coating a steel plate includes a plating bath(30) and an atomized molten metal feeding unit(50). The plating bath maintains a sealed space. An ambient gas is provided to the inside of the plating bath. A steel plate(S) is vertically transferred through the center of the plating bath. The atomized molten metal feeding unit sprays atomized molten metal(10) onto the surface of the steel plate passing the plating bath by using a high-pressure gas. The atomized molten metal feeding unit is connected with the plating bath.

Description

Continuous Plating Apparatus and Method of Steel Sheet {APPARATUS AND METHOD FOR CONTINUOUS METAL COATING OF STRIP}

The present invention relates to an apparatus and method for continuously plating a steel sheet, and more particularly, to a plated metal of a desired component by spray-attaching the atomized molten metal using a high pressure gas in a non-oxidizing or reducing atmosphere to the surface of the steel sheet By performing continuous plating, the present invention relates to a continuous plating apparatus and method for a steel sheet that overcomes limitations on the plated metal component and makes the plating layer easier to form.

In general, galvanized steel sheets produced in steel mills are excellent in corrosion resistance and are widely used for steel plates for automobile bodies, plates for home appliances, and architectural steel sheets. Until now, cold-rolled steel sheets that have been annealed have been electroplated or hot-dipped. Galvanized to prepare a plated steel sheet.

Such hot-dip galvanized steel sheet has been mostly used as a building material in the early days, but in recent years, it is possible to mass-produce hot-dip galvanized steel sheet that can withstand harsh processing conditions. It is expanding.

Therefore, as the use range of the home appliance or automobile material whose surface quality is important is widened, the demand for improving the plating quality of the steel sheet, for example, surface gloss, corrosion resistance, weldability and paintability, is also increasing. It is increasing.

On the other hand, the latter electroplating method has the advantage that it is easy to control the amount of plating deposition, but since the amount of deposition of the steel plate plating layer is proportional to the amount of applied current, much electricity is used to form a thick plating layer on the surface of the steel sheet. In addition to increasing the manufacturing cost of the steel sheet, in particular, since the plating solution used during electroplating is made of environmental pollutants such as hydrochloric acid or sulfuric acid, the problem of environmental pollution has always been raised.

Next, the electroplating method of the former of the plating method provides an advantage that the plated steel sheet can be easily produced by plating a steel plate in a molten zinc bath, but the following problems are raised.

For example, the steel sheet from the plating tank filled with molten metal wipes the surface of the steel sheet to adjust the coating weight, so that vibration of the steel sheet occurs a lot and the maximum production speed of the steel sheet is limited to 180 mpm. Not only this is limited, but there was a problem that the noise is so severe that the worker's working environment is poor.

That is, the hot-dip plating method has difficulty in controlling the thickness of the plating layer, and when the plating component contains a component that is easy to oxidize in changing the plating component, severe oxidation of the oxide formed on the surface of the molten metal and the component itself Due to this, there was a difficulty in manufacturing, such as the plating layer is not adhered well to the steel sheet.

On the other hand, as a plating method of a new steel sheet, a plating method through vacuum deposition is known, but since the molten metal must be evaporated in a vacuum state, various accessory facilities are required to make the plating tank in a vacuum in an actual operation line. Because of this, the overall plating equipment is complicated, which has a costly problem in terms of equipment production or operation.

In particular, in the case of the plating through such a vacuum deposition, there is also a problem that the operating cost greatly increases when forming a relatively thick coating layer of 10 ㎛ or more.

Accordingly, the applicant of the present invention has proposed the steel plate plating apparatus and method of the present invention, which makes it possible to freely control the plating component, and facilitates the formation of the thick plating layer required in high-grade steel sheet.

The present invention has been proposed in order to solve the various problems as described above, the object of the object is to spray-attach the atomized molten metal to the surface of the steel sheet using a high-pressure gas in a non-oxidizing or reducing atmosphere of the plated metal of the desired component The present invention provides a continuous plating apparatus and method for a steel sheet which overcomes limitations on the plated metal component and makes the plating layer more easily formed by performing continuous plating of the steel sheet.

As a technical aspect for achieving the above object, the present invention provides a plating tank in which the atmosphere gas is provided inside the steel sheet is vertically transferred through the center portion while maintaining a closed space; And,

An atomized molten metal supply unit connected to the plating bath to spray the atomized molten metal by using a high pressure gas on the surface of the steel sheet passing through the plating bath;

It provides a continuous plating apparatus of the steel sheet configured to include.

In addition, the present invention as a technical aspect, the step of transferring the steel plate to maintain the temperature between the melting point temperature of the molten metal from 200 ℃ or more through the center of the plating bath in the state of maintaining a non-oxidizing or reducing atmosphere in the plating bath ; And,

Plating the surface of the steel sheet by spraying the molten metal into a droplet size of 1-1000 µm through an injection nozzle means provided in the plating bath and supplied with molten metal and a high pressure gas;

It provides a continuous plating method of the steel sheet configured to include.

As described above, according to the steel sheet continuous plating apparatus and method of the present invention, it is possible to form a plating layer of various components without modifying or changing the plating apparatus, and to perform plating with various components than conventional hot dip plating and electroplating. It provides an excellent effect that makes it possible.

In addition, the high pressure gas (fluorinated gas) supplied to the injection nozzle means collides with the molten metal to realize atomization of the molten metal, as well as by adjusting the droplet size or the injection amount of the molten metal injected onto the steel plate surface to form a plated layer of the same component. Providing various types of plated steel sheets having different thicknesses may provide other excellent effects that facilitate the production of rulon and steel plates plated only on one side.

Hereinafter, a preferred embodiment of the present invention according to the accompanying drawings in detail as follows.

Figure 1 shows the overall configuration of the continuous plating apparatus of the steel sheet according to the present invention, Figures 2 and 3 of the molten metal injection nozzle means 70, 80 of the atomized molten metal supply unit 50 will be described later The concrete structure is shown.

For example, as shown in FIG. 1, the continuous plating apparatus 1 of the steel sheet of the present invention is largely provided with an atmosphere gas therein while maintaining a closed space, and the steel sheet S is vertically transferred through the center portion. Plating bath 30 and the atomized molten metal supply unit 50 connected to the plating bath to spray the atomized molten metal 10 using a high pressure gas (G) on the surface of the steel sheet passing through the plating bath 30 to the plating bath. Consists of.

That is, the apparatus of the present invention is sprayed on the surface of the steel plate S in which the plating vessel 30 is substantially plated, for example, liquid droplets of molten metal are vertically conveyed in the plating bath 30 as shown in FIGS. The plated and molten metal supply unit 50 makes it possible to spray plate the atomized molten metal on the steel sheet.

Therefore, hereinafter, looks at with respect to the plating bath 30 and the molten metal supply unit 50 which is an important configuration in the apparatus of the present invention.

First, FIG. 1 shows the plating bath 30 in the apparatus 1 of the present invention.

That is, the plating bath 30 has a rectangular plate structure so that a suitable space for plating is formed therein, and the upper and lower portions of the plating bath 30 seal units 40 to block inflow of external air ( 38) is installed.

In addition, an atmosphere gas having a non-oxidizing component or a reducing component is provided inside the plating bath 30 to prevent oxidation of the molten metal 10.

In addition, the feed rolls 32, 34, for example, deflector rolls are provided at the entrance and exit sides of the plating vessel 30 to enable vertical transfer of the steel sheet S across the center of the plating vessel 30.

1 and 2, in the apparatus of the present invention, the steel sheet S is transported through the plating bath 30 vertically from the bottom up.

At this time, the steel sheet should be transported across the center of the plating bath, which is intended to equalize the distance between the steel sheets from the atomized molten metal injection nozzle means 70 and 80 to be described in detail below.

In addition, in the apparatus of the present invention, as shown in FIG. 1, the heat treatment furnace 36 and the cooler 42 are interposed between the upper and lower portions of the plating bath 30 described above at the entrance and exit sides. Are arranged respectively.

Therefore, the steel sheet S passes through the heat treatment tank 36 before entering the plating bath 30, and as described in detail below, at a temperature suitable for performing the plating, for example, from 200 ° C or higher. After the heat treatment to maintain the temperature range between the melting point temperature of the molten metal 10 enters the interior of the plating bath (30).

In addition, the cooler 42 cools the plated steel plate in the plating bath to be transferred to a later process.

At this time, as shown in Figure 1, the heat treatment tank 36 is filled with a mixed gas of nitrogen and hydrogen to maintain a reducing atmosphere. This is to maintain the plating adhesion in the plating bath.

In addition, the heat treatment tank 36, as schematically shown in Figure 1, is provided with a heating means 36a for maintaining the temperature of the heat treatment tank, such a heating means is a continuous annealing equipment used for the annealing of the steel sheet A heating means such as a radiant tube or a known heating means such as a known heating coil or a high frequency induction heater may be used.

Therefore, the heating means heats the internal atmosphere gas so that the steel sheet maintains the temperature and adjusts the temperature of the steel sheet passing therethrough.

On the other hand, the upper portion of the sealing unit 38 in the lower portion of the plating bath has an upper plate 38a for forming a gap so that the internal gas of the heat treatment tank 36 can escape to the plating bath 30 is introduced into the plating bath. .

For example, such an upper plate 38a substantially forms a very fine gap so that droplets of molten metal, ie, atomized molten metal, that are injected do not enter the heat treatment tank, and the gas of the heat treatment tank is discharged through the gap so that the molten metal is discharged. Block entry of

Therefore, in the apparatus of the present invention, a series of facilities of the heat treatment tank 36, the lower sealing unit 38, the plating tank 30, and the upper sealing unit 40 is blocked, the inflow of the outside air while the non-oxidizing inside the plating tank Alternatively, continuous plating of the steel sheet is performed while the reducing atmosphere is maintained and the steel sheet is vertically transferred across the center of the plating bath.

Next, FIGS. 1 to 3 illustrate the (particulate) molten metal supply unit 50 according to the present invention.

For example, as shown in FIG. 1, the atomized molten metal supply part connected to the plating bath to spray the atomized molten metal 10 ′ using high pressure gas G on the surface of the steel sheet passing through the plating bath 30. 50, the atomized molten metal injection nozzle means provided on both sides of the plating bath 30 again, molten metal supply means 90 for supplying molten metal to the injection nozzle means, and the injection nozzle means 70 It is configured to include a high pressure gas supply means 110 is connected to supply a high pressure inert gas).

Therefore, as described in detail below, the atomized molten metal dispersion nozzle means in the apparatus of the present invention enables spray plating of the atomized molten metal 10 '(molten metal droplet 10' of FIG. 2) substantially on the steel plate surface. Each supply means enables the supply of the molten metal and the high pressure gas to enable the atomization of such molten metal, that is, the plating of the steel sheet through the formation of droplets.

However, the injection nozzle means is provided on both sides of the plating tank, but of course, it is possible to adjust the plating on one side or both sides of the steel sheet depending on whether the operation.

On the other hand, Figure 2 and Figure 3 shows two forms of the injection nozzle means of the present invention, for example, as shown in Figure 2 the high-pressure gas (G), for example, inert gas such as nitrogen and molten metal as shown in FIG. Atomized injection of molten metal is carried out by mixing collision at the nozzle discharge port side (outside the nozzle head), or the atomized molten metal is sprayed on the steel sheet by colliding the molten metal 10 and the high pressure gas G inside the nozzle as shown in FIG. It may be in a form that makes it possible to do so.

For example, as shown in Figure 2, the molten metal injection nozzle means 80 of an embodiment of the present invention, the nozzle head 82 and the nozzle head fixed in communication with the plating tank side wall ( And a molten metal passage 84 and a high pressure gas passage 86 provided at 82, and the angles of the respective passage nozzle head outlets 84a and 86a are adjusted to atomize the collision with the molten metal and the high pressure gas. The molten metal can be configured to be externally mixed to be sprayed onto the steel sheet.

At this time, preferably, the high pressure gas passage 86 is provided above and below the cross section of the nozzle head 82 so as to collide with the discharge port above and below, and the molten metal passage 84 is disposed at the center thereof, in particular, the high pressure gas. The angle of the discharge port 86a is formed at an angle that facilitates atomization due to the collision of the high pressure gas and the molten metal, and the injection of the high pressure gas rapidly collides with the molten metal injected in the center to optimize the formation of the atomized molten metal. It is preferable to make it.

Thus, the molten metal passage outlet 84a is substantially horizontal.

As a result, the injection nozzle means 80 of FIG. 2 has an advantage of blocking the clogging of the nozzle outlet passages because the molten metal atomization due to the collision of the high pressure gas and the molten metal is implemented at the discharge side (outside) of the nozzle head 82. However, the internal structure of the nozzle head is complicated compared to the internal mixing type of FIG. 3.

Next, as shown in Figure 3, the nozzle nozzle 70 of another embodiment of the internal mixing type, the nozzle head connected in a fixed state in communication with the appropriate plating position of the steel sheet conveyed to both side walls of the plating bath 30 72, the molten metal passage 74 and the high pressure gas passage 76 provided in the nozzle head 72 and communicating with the inside of the nozzle head, and formed on the front side of the nozzle head 72 and atomized. And a discharge port 78 for injecting molten metal.

Therefore, as shown in FIG. 3, the molten metal is supplied to the inside of the head adjacent to the nozzle head outlet 78 while colliding with the high-pressure gas G supplied at a high pressure through a passage from the rear to thereby atomize the molten metal (droplet formation). While being implemented is to be injected from the discharge port (78).

As a result, in the injection nozzle means of FIG. 3, the internal structure of the nozzle head is simplified compared with FIG. 2.

In this case, as shown in FIG. 3, the portion where the molten metal and the high pressure gas collide with each other in the injection nozzle means 70 of the internal mixing type is narrowly formed, and the high pressure gas passage and the discharge port are formed wider to realize atomization when the high pressure gas collides with the molten metal. It would be preferable to enable high-speed expansion spraying into the steel sheet after and after.

Next, in FIGS. 1 to 3, molten metal supply means 90 and high pressure gas supply for supplying molten metal and high pressure gas to the nozzle heads 72 and 82 of the respective injection nozzle means 70 and 80. The means 110 is shown.

For example, as shown in FIG. 1, each of the supply means 90 and 110 is a molten metal and high pressure gas storage tank 92 and 112 disposed on one side of the plating bath 30 and the respective storage tank. And a supply valve 98 connected between the nozzle head of the injection nozzle means and a control valve 94 and 114 for adjusting the flow rate and pressure of the supplied molten metal, and a pump 96 and a blowing unit 116. 118).

Accordingly, the molten metal 10 supplies the appropriate amount of molten metal 10 to the nozzle head at an appropriate pressure through the control of the control valve 94 when the pump 96 is operated, and the high pressure gas of the blowing unit 116 In operation, it is supplied to the nozzle head while being adjusted to an appropriate pressure and amount through the control valve 114.

At this time, each of the storage tanks 92 and 112 has a heating means 92a and 112a for adjusting the molten metal and the high-pressure gas, for example, a heating coil or a high frequency induction facility.

That is, the molten metal reservoir is heated to maintain the temperature of the molten metal in the reservoir so as to maintain the temperature to maintain the melting point of zinc, for example, zinc plating, and the high pressure gas is also heated to maintain a temperature suitable for zinc plating.

In this case, although not shown in a separate drawing, it is preferable to install a level sensor in the molten metal reservoir 92 so that the molten metal 10 is always maintained at a constant level in the molten metal reservoir 92.

In addition, maintaining the proper temperature of the high pressure gas is to prevent the molten metal from cooling solidification in the nozzle head of the actual injection nozzle means, if the temperature of the high pressure gas is low, the molten metal is easily solidified to block the discharge port of the nozzle head This is because there is concern.

Next, as shown in FIG. 1, the control valves 94 and 114 and the pump unit installed in the supply pipes 98 and 119 of the respective molten metal supply means 90 and the high pressure gas supply means 110. 96 and blowing unit 116 and heating means 92a and 112a may be controlled in electrical connection with device control unit C.

For example, although not shown, various temperature sensors, pressure sensors, and flow rate sensors provided in the plating apparatus may be connected to the control unit C to control and adjust an appropriate flow rate and pressure of the molten metal and the high pressure gas.

Alternatively, as shown in FIG. 1, the plating thickness measuring unit 130 may be installed at the exit side of the plating bath, and it may be linked with the apparatus control unit C to control the operation of the control related components.

That is, in the molten metal injection nozzle means 70 and 80, as described above, since the molten metal and the high pressure gas collide with each other at high speed to differentiate the molten metal, the flow rate of the molten metal 10 and the high pressure gas G Pressure can be an important factor in determining the degree of atomization of such molten metal. Therefore, it is necessary to control the operation of the control valve and the pump and the blowing unit through the device control unit (C).

Next, as shown in FIG. 1, in the apparatus 1 of the present invention, a circulation line 150 of residual molten metal may be linked to the lower portion of the plating bath.

That is, a circulation pipe 156 including an opening / closing valve 152 and a pump 154 is installed between the plating tank 30 and the molten metal storage tank 92, and the molten metal dropped during the steel sheet spraying is installed through the circulation tube 156. It may be possible to recycle to the reservoir 92 and reuse it.

Next, look at the important plating method for the continuous plating of the steel sheet using the continuous plating apparatus of the steel sheet of the present invention.

For example, as shown in FIG. 1, the inside of the plating bath 30 is supplied with an atmosphere gas to maintain a non-oxidizing atmosphere, which is passed through the heat treatment tank 36 and introduced into the plating bath S. This is because if the surface of is oxidized, it may adversely affect the steel sheet adhesion of the molten metal (droplets 10 'in Fig. 2).

As described above, the inside of the heat treatment tank 36 is also filled with nitrogen or a mixed gas of nitrogen and hydrogen capable of maintaining a reducing atmosphere so that the steel sheet S enters the plating bath 30 in a non-oxidized state. It is preferable.

By the way, even when the inside of the plating tank 30 only fills nitrogen gas which is non-oxidizing and inert gas, it is known that the plating adhesion of a steel plate is maintained.

Next, a high-speed collision with the molten metal 10 to which the high pressure gas G is supplied from the injection nozzle means 70 or 80 of the molten metal supply unit 50 is atomized by the collision and the pressure of the high pressure gas is atomized. By reaching the steel sheet (S) to achieve the steel plate plating of the molten metal.

At this time, the high-pressure gas (G) is also preferably used for the non-oxidizing inert gas, for example nitrogen gas so that the molten metal is not oxidized in the collision with the molten metal. In addition, such nitrogen gas is also inexpensive, and as described above, the high pressure gas may be preferably heated in a storage tank so that molten metal does not solidify in the nozzle head.

On the other hand, the molten metal droplet (10 ') that is injected through the injection nozzle means (80 of FIG. 2 or 70 of 3), that is, the atomized molten metal is preferably to have a size smaller than 1000 ㎛.

For example, in FIG. 2, when the size of the molten metal droplet 10 ′ is larger than 1000 μm, the molten metal droplet 10 ′ may be sprayed and adhered to the steel sheet surface, but may flow down from the steel sheet surface to make the surface of the steel sheet plating layer uneven. Deteriorates aesthetics

In addition, when the size of the molten metal droplet 10 'is larger than 1000 µm, the solidification time of the molten metal also becomes long, and the plated layer is formed until the steel sheet S passes through the plating bath 30 and reaches the upper feed roll 34. Molten metal is attached to the surface of the conveying roll is not solidified, which may cause a number of problems, that is, contamination of the conveying roll.

However, most preferably, the size of the droplets (particles) of the molten metal is 100 µm or less. This is because the smaller the size of the droplet 10 ', the thinner the thickness of the steel plate plated layer will be to facilitate the manufacture of the thin plated steel sheet, and the uniform thickness of the steel plate in the width direction.

On the other hand, as shown in Fig. 2, since the droplets 10 'atomized with the molten metal supplied by colliding with the high-pressure gas are spray-bonded to the surface of the steel sheet, the temperature of the steel sheet is kept constant when the steel sheet is plated using the apparatus of the present invention. It is preferable to make it.

For example, as shown in FIG. 2, the molten metal droplets 10 ′ that reach the surface of the steel sheet S adhere well to the surface of the steel sheet when a wet phenomenon occurs on the surface of the steel sheet, and when the temperature of the steel sheet is low, the molten metal liquid The enemy is not so wet that the steel plate adhesion is insufficient, and a good plating layer cannot be obtained.

Therefore, it is preferable that the temperature of the steel sheet S drawn into the plating bath 30 is maintained between the melting point temperatures of the molten metal 10 from 200 ° C while passing through the heat treatment tank 36.

In this case, it is known that the best steel plate plating (dropping of the droplets) is performed.

At this time, when the temperature of the steel sheet is higher than the melting point of the molten metal, a reaction may occur between the steel sheet (S) and the molten metal 10, rather it may impair the adhesion of the molten metal to the steel sheet adhesion or the plating layer.

On the contrary, when the temperature of the steel sheet is lower than 200 ° C., it becomes difficult for the molten metal to adhere uniformly to the surface of the steel sheet and finally the adhesion of the plating layer is lowered.

Therefore, it is preferable that the heating means 36a of the heat treatment tank 36 be controlled to be linked to the control unit C to maintain the steel sheet temperature in the above range.

Next, the temperature of the high pressure gas supplied to the injection nozzle means (80 in FIG. 2 or 70 in FIG. 3) also needs to be adjusted through the heating means 112a of the storage tank 112. The maintenance of the temperature of the high pressure gas will prevent the molten metal from solidifying inside the nozzle head to block the outlet of the nozzle head.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

1 is an overall configuration diagram showing a continuous plating apparatus of a steel sheet according to the present invention

Figure 2 is a main configuration diagram showing the atomization generating means in the present inventors device

Figure 3 is a main configuration showing another embodiment using the plating solution injection nozzle and the atomization generating means together when the plating layer is increased in the present invention device

Explanation of symbols on the main parts of the drawings

1 .... steel plate plating equipment 10 .... Molten metal

10 '.... Droplets with atomized molten metal (atomized molten metal particles)

30 .... Plating bath 32,34 .... Steel plate feed roll

36 .... Heat treatment tank 38, 40 .... Sealing unit

42 .... Chiller 50 .... Atomized molten metal supply

70,80 .... Injection nozzle means 72,82 .... Nozzle head

74,84 .... Molten Metal Passage 76,86 .... High Pressure Gas Passage

90,110 .... Means for supplying molten metal and high pressure gas

92,112 .... reservoir 94,114 .... control valve

96 .... Pump 116 .... Blowing Unit

98,118 .... Supply pipe

Claims (11)

Plating tank 30 is provided with an atmosphere gas inside and maintaining the closed space and the steel sheet (S) is vertically transferred through the center portion; And, An atomized molten metal supply unit 50 connected to the plating bath to spray the atomized molten metal 10 using a high pressure gas on the surface of the steel sheet passing through the plating bath 30; Continuous plating apparatus of the steel sheet including a. The method of claim 1, Steel plate feed rolls 32 and 34 are disposed on the steel plate entrance and exit sides of the plating bath 30 so that the steel plate is vertically transferred across the center of the plating bath. The plating vessel 30 is a continuous plating apparatus of the steel sheet, characterized in that the inert or reducing atmosphere gas is filled. The method according to claim 1 or 2, On the steel plate inlet side of the plating bath 30, a heat treatment tank 36 for maintaining a predetermined temperature range corresponding to the molten metal property as an atmosphere while the steel sheet passes therethrough is disposed in an airtight state, and is disposed between the plating bath and the heat treatment tank 36. Continuous plating apparatus of the steel sheet, characterized in that the sealing unit 38 is interposed. The method of claim 3, The temperature of the steel sheet (S) passing through the heat treatment tank is a continuous plating apparatus of the steel sheet, characterized in that it consists of a range between the melting point temperature of the molten metal 10 or more from 200 ℃ The method of claim 1, The atomized molten metal supply unit 50 for supplying the atomized molten metal 10 to the plating bath, Atomizing molten metal injection nozzle means provided on both sides of the plating bath 30; Molten metal supply means (90) for supplying molten metal to the injection nozzle means; And, High pressure gas supply means (110) connected to supply high pressure inert gas to the injection nozzle means; Continuous plating apparatus of the steel sheet, characterized in that comprises a. The method of claim 5, The injection nozzle means 70, A nozzle head 72 connected and fixed to the plating tank sidewall; A molten metal passage 74 and a high pressure gas passage 76 provided in the nozzle head 72 and communicating within the nozzle head; And, A discharge port 78 formed at a front side of the nozzle head 72 to spray the atomized molten metal; Continuous plating apparatus of the steel sheet, characterized in that configured to include an internal mixing type. The method of claim 5, The injection nozzle means 80, A nozzle head 82 connected to and fixed to the plating tank sidewall; And, A molten metal passage 84 and a high pressure gas passage 86 provided in the nozzle head 82; Wherein each passage nozzle head discharge side (84a) (86a) the angle is adjusted to the continuous plating apparatus of the steel sheet, characterized in that the molten metal atomized by the collision of molten metal and high-pressure gas is sprayed on the steel sheet in the external mixing type . The method of claim 5, The molten metal supply means 90 and the high pressure gas supply means 110 for supplying the molten metal and the high pressure gas to the nozzle head provided in the injection nozzle means, Molten metal and high pressure gas storage tanks 92 and 112 disposed on one side of the plating tank; Control valves 94 and 114, which are connected between the respective reservoir tanks and the nozzle heads of the injection nozzle means, to adjust the flow rate and pressure of the supplied molten metal, and the pump 96 and the blowing unit 116 are provided. Supply pipes 98 and 118; Continuous plating apparatus of the steel sheet comprising a. The method of claim 8, The control valve, pump, blowing unit is associated with the device control unit (C), the device control unit (C) is associated with the plating thickness measuring means 130 disposed on the plated steel plate exit side, The plating apparatus of the steel sheet continuous plating apparatus, characterized in that the cooler 42 is disposed via the sealing unit 40 through the side. Transferring a steel plate maintaining a temperature between a melting point temperature of the molten metal from 200 ° C. or more through the center of the plating bath while maintaining a non-oxidizing or reducing atmosphere in the plating bath; And, Plating the surface of the steel sheet by spraying the molten metal into a droplet size of 1-1000 µm through an injection nozzle means provided in the plating bath and supplied with molten metal and a high pressure gas; Continuous plating method of the steel sheet comprising a. The method of claim 10, In the step of injecting the molten metal, the high-pressure gas supplied to the injection nozzle means and molten metal mixed collision at the inside or the discharge port side of the injection nozzle means to atomize to a droplet size of the above range, characterized in that .

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