KR101795965B1 - Coating facility and coating method - Google Patents

Abstract

According to an embodiment of the present invention, a plating facility may comprise a plating tank, a plating steel plate preceding cooling device, and a plating steel plate following cooling device. The plating tank has a steel plate positioned to allow a plating solution to pass therethrough. The plating steel plate preceding cooling device is positioned on an outlet-side, through which the steel plate is discharged of the plating tank, and forms mist from cooling water by ultrasonic vibrations to be sprayed together with air to the steel plate. The plating steel plate following cooling device is provided to a movement path of the steel plate while following the plating steel plate preceding cooling device, and allows the plating steel plate preceding cooling device to again cool the cooled steel plate. Moreover, in accordance with another embodiment of the present invention, the plating method comprises: an applying step of applying a plating solution to a steel sheet; a pre-cooling step of spraying air together with mist formed by ultrasonic vibrations to the steel plate coated with the plating solution; and post-cooling step of again cooling the coated steel plate by spraying cooling water to the coated steel plate cooled in the pre-cooling step.

Description

[0001] COATING FACILITY AND COATING METHOD [0002]

The present invention relates to a plated steel plate preceding cooling apparatus and a plating apparatus including the same.

In the manufacturing process of steel products, continuous plating process is performed to produce coated steel sheet according to customer's needs.

In such a continuous plating process, the molten plating liquid attached to the surface of the steel sheet passing through the plating bath provided with a plating solution such as zinc is cooled to produce a coated steel sheet.

That is, since the steel plate having passed through the plating bath has excess plating liquid adhered to both sides thereof, it is formed into a plating layer having an appropriate thickness by using an air knife, and then the unfused zinc solution of about 460 DEG C or more is cooled And a plating layer having sufficient strength is formed on the surface of the steel sheet by solidification using the apparatus, thereby producing a coated steel sheet.

However, if the cooling of the plating solution does not proceed rapidly, the sequin pattern, which is a crystal growth pattern generated on the surface of the plating layer, can not be miniaturized, thereby causing a problem in the plating quality.

On the other hand, in order to solidify the plating layer, the uncoagulated plating solution is cooled using air such as an air cooler, and the plating layer, which is partially solidified and secured to a certain degree of strength, is cooled by a cooling nozzle Respectively.

The reason why the steel plate coated with the plating solution is cooled by using the air cooler at the initial stage of cooling of the steel plate is as follows. When water droplets of the cooling water are sprayed on the coating layer in an uncoagulated state, a pit mark .

That is, at the initial stage of cooling of the plating layer, air is sprayed to cool the plating layer, thereby preventing occurrence of surface defects on the coated steel sheet.

In addition, the plated layer, which is solidified to some extent by the air cooler and secured to a certain degree of strength, is completely solidified by spraying cooling water from a cooling nozzle. In order to cool the plated layer, the cooling water is attached to the plated layer, However, since only a part of the injected cooling water adheres to the plating layer, there is a problem that the cooling ability is lowered.

As described above, the cooling method using the air at the initial stage of the solidification of the plated layer is slower than the cooling method using the cooling water, and only the cooling water is adhered to the plating layer even in the cooling method by the injection of the cooling water. There arises a problem that a sequin which is a zinc coagulation pattern of the plating layer due to low-speed cooling becomes excessively large.

That is, when the sequin pattern shown in FIG. 10 (a) is formed on the surface of the coated steel sheet, the degree of gloss of the plated product is lowered as well as the degree of glossiness of the plated steel product, so that it can not be used for high quality products such as automobile exterior materials and exterior materials for home appliances.

In addition, when the plating layer that has not sufficiently cooled is brought into contact with the transfer roll, a part of the plating liquid adheres to the roll, thereby generating a pick-up mark in the width direction on the surface of the steel sheet, There is also a problem that becomes a factor.

In addition, according to the low-speed cooling of the plating layer, it is necessary to secure a sufficient cooling time of the coated steel sheet in the equipment for continuously producing the coated steel sheet, and as a result, the length of the cooling line becomes longer.

An object of the present invention is to improve the quality of a coated steel sheet by increasing the cooling rate of the coated layer on the steel sheet and to provide a plating steel sheet preceding cooling apparatus and a plating facility including the same,

A plating apparatus according to an embodiment of the present invention includes a plating tank through which a steel plate passes through a plating solution, and an outlet through which the steel plate is discharged from the plating tank. The cooling water is formed into a mist by ultrasonic vibration, And a plated steel plate following cooling device which is provided after the plated steel plate preceding cooling device for spraying the steel plate and the cooling path of the steel plate before the preceding cooling device and for cooling the steel plate cooled by the preceding cooling device have.

The preliminary cooling apparatus of the plating apparatus according to an embodiment of the present invention may perform at least cooling of the plating solution on the surface of the steel sheet discharged from the plating vessel at a temperature higher than the melting temperature of the plating solution, And the plating solution is cooled to a temperature lower than the melting temperature of the plating solution and transferred to the post-cooling device.

Further, the preceding cooling apparatus of the plating facility according to an embodiment of the present invention may include a preceding body unit provided on an outlet side from which the steel plate is discharged from the plating vessel, the preceding body unit, And an ultrasonic unit which is provided in the preceding body unit and which forms cooling water in a mist and injects air to the steel plate along the air injected from the air injection unit.

Further, the ultrasonic unit of the plating facility according to an embodiment of the present invention may include a preceding container unit provided in the preceding body unit and provided with cooling water, and an ultrasonic unit provided in the preceding container unit, An ultrasonic wave generator for generating the cooling water as a mist; and a mist guide provided on the upper side of the preceding container for guiding the mist to a position where the steel plate is provided.

In addition, the air injection unit of the plating facility according to an embodiment of the present invention may include an air supply unit that is provided in the preceding body unit and receives air from outside to spray the steel plate, and the air supply unit And a temperature control unit provided to control the temperature of the air conditioner.

In addition, the air injection unit of the plating facility according to an embodiment of the present invention may include an air amount adjusting unit provided in the air supply unit and provided to adjust the flow rate of air delivered from the outside.

Further, the preceding body unit of the plating facility according to an embodiment of the present invention is provided in a front frame portion provided on the movement path of the steel plate and a front end portion of the preceding frame portion facing the steel plate, And a slit nozzle portion provided at least at a width larger than the width of the steel sheet so as to jet the air provided by the unit and the mist provided by the ultrasonic unit to the steel sheet.

In addition, the preceding body unit of the plating facility according to an embodiment of the present invention may include a preceding air curtain unit provided at the periphery of the slit nozzle unit and guiding the air and the mist to be sprayed to the steel plate.

In addition, the preceding cooling device of the plating facility according to an embodiment of the present invention may include a filter unit provided in the preceding body unit and adjusting a size of mist particles to be sprayed on the steel plate.

In addition, the filter unit of the plating facility according to an embodiment of the present invention may include a filter frame unit provided on the flow path of the mist formed in the ultrasonic unit and coupled to the preceding body unit, And the flow path of some of the mist particles may be provided for changing, and the remaining mist particles may include a throttle plate provided to be collided by a mobile inertia force.

In addition, a plurality of the regulating plate portions of the plating facility according to an embodiment of the present invention may be provided at a predetermined interval in the filter frame portion.

Further, the adjusting plate portion of the plating apparatus according to an embodiment of the present invention may be provided at an oblique angle with respect to the flow path of the mist particles.

Further, the following cooling device of the plating facility according to an embodiment of the present invention is characterized in that the plating solution coated on the outer surface of the steel plate is received at least in the preceding cooling device, the steel plate cooled to a temperature lower than the melting temperature of the plating solution, And cooling the steel sheet by spraying cooling water to which the polarity is imparted by charging.

The trailing cooling unit of the plating facility according to an embodiment of the present invention may further include a trailing body unit provided to the trailing body unit in a trailing path of the steel plate than the preceding cooling unit, And a charging unit provided in the trailing body unit integrally with the cooling water spraying unit and charging the cooling water to impart polarity to the cooling water spraying unit.

In addition, the charging unit of the plating facility according to an embodiment of the present invention may include an electrode supporting part provided in the trailing body unit and an electrode part provided in the electrode supporting part and forming an electric field by applying a static charge, At least a part of the flow path portion of the cooling water injection unit through which the cooling water flows is provided in front of the electrode portion with respect to the cooling water injection direction so that the cooling water provided in the flow path portion is charged with the same polarity.

Further, the cooling water spraying unit of the plating facility according to an embodiment of the present invention may include a trailing container portion provided in the trailing body unit and grounded at the ground, provided with cooling water, And a spot nozzle unit that receives the cooling water from the cooling plate and ejects the cooling water to the steel plate.

Further, the spot nozzle portion of the plating facility according to an embodiment of the present invention may be provided with a plurality of regions having a width larger than the width of the steel plate.

In addition, the cooling water injection unit of the plating facility according to an embodiment of the present invention may include an air pressure providing unit that communicates with the spot nozzle unit and provides air to increase the injection pressure of the cooling water.

Further, the trailing body unit of the plating facility according to an embodiment of the present invention may include a trailing frame portion provided on a moving path of the steel plate and a peripheral portion of the spot nozzle portion, wherein the cooling water is guided to the steel plate And a trailing air curtain.

In addition, the plating facility according to an embodiment of the present invention is provided behind the movement path of the steel plate than the posterior cooling device, and when the plating solution clad on the outer surface of the steel plate is completely solidified by the following cooling device, And a water-cooling apparatus that receives the steel plate and performs underwater cooling.

Further, the plating apparatus according to an embodiment of the present invention may include an air knife provided between the plating tank and the preceding cooling apparatus on the movement path of the steel plate so as to adjust the thickness of the plating solution on the steel plate have.

The trailing cooling device of the plating facility according to an embodiment of the present invention may further include a first region in which the movement path of the steel sheet moves upward of the plating bath, a first region connected to the first region, And a third region connected to the second region and moving downwardly along the movement path of the steel sheet.

According to another embodiment of the present invention, there is provided a plating method comprising: a coating step of coating a plating solution on a steel sheet; a line cooling step of spraying a mist formed by air and ultrasonic vibration on a steel sheet coated with the plating solution; And then cooling the steel sheet to cool the steel sheet again to cool it.

The pre-cooling step of the plating method according to another embodiment of the present invention may include cooling the plating solution on the surface of the steel sheet formed at least at a temperature higher than the melting temperature of the plating solution, And the plating solution is cooled to a lower temperature and transferred to the post-cooling step.

In addition, the post-cooling step of the plating method according to another embodiment of the present invention may include a step of cooling the plating steel plate cooled to a temperature lower than at least the melting temperature of the plating solution in the pre-cooling step, And cooling is performed by injecting cooling water to which polarity is imparted.

Advantageous Effects of the Invention The plating steel plate preceding cooling apparatus of the present invention and the plating facility including the same have the advantage that the quality of the coated steel sheet can be improved by increasing the cooling rate of the plating layer coated on the steel sheet.

In addition, by spraying fine water particles formed by using ultrasonic waves at the time of cooling by the air at the initial stage of cooling the steel plate coated with the plating solution, it is possible to prevent the formation of indented pit marks in the non-solidified plated layer, There is an effect that can be increased.

In addition, since the cooling water is jetted while charging the cooling water for cooling the steel plate coated with the plating solution partially coated on the outer surface, the charging efficiency with respect to the cooling water jetted can be enhanced, The cooling efficiency can be increased by the injection of the cooling water.

1 is a front view showing a plating facility of the present invention.
Fig. 2 is a front view showing a plating apparatus for plating a steel plate in the plating facility of the present invention.
3 is a front view showing an embodiment in which the temperature control unit of the air injection unit is provided outside the air supply unit in the plating apparatus according to the present invention.
FIG. 4 is a perspective view showing a plated steel plate preceding cooling apparatus in the plating facility of the present invention. FIG.
Fig. 5 is a front view showing an embodiment in which the preceding body unit in the plated steel plate preceding cooling apparatus of the plating facility of the present invention includes the preceding air curtain portion.
6 is a front view showing an operating state of the filter unit in the plated steel plate preceding cooling apparatus of the plating facility of the present invention.
7 is a front view showing a plated steel plate after-cooling device in the plating facility of the present invention.
8 is a perspective view showing a plated steel plate after-cooling device in the plating facility of the present invention.
Fig. 9 is a front view showing an embodiment in which the trailing body unit in the plated steel plate after-cooling apparatus of the plating facility of the present invention includes a trailing air curtain portion.
10 is a photograph showing a state in which a sequin pattern is coarsened during cooling of a plating layer according to the prior art, and a state in which a sequin pattern is refined at the time of cooling the plating layer according to the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plated steel plate preceding cooling apparatus 100, a plated steel plate post cooling apparatus 200, and a plating apparatus including the same, wherein the cooling rate of the plated layer applied to the steel plate S is increased, Not only the quality can be improved, but also the size of the facility can be prevented.

1 is a front view showing a plating facility of the present invention, FIG. 10 (a) is a photograph showing a state in which a sequin pattern is coarsened when a plating layer is cooled by a conventional technique, and FIG. 10 ) Is a photograph showing a state in which a sequin pattern has become finer at the time of cooling the plating layer by the present invention.

The plating apparatus of the present invention is provided with a plating tank 300 through which a steel sheet S is passed as a plating solution L and an outlet through which the steel sheet S is discharged from the plating tank 300 A plated steel plate preceding cooling apparatus 100 for forming cooling water by mist by ultrasonic vibration and spraying the cooling water to the steel plate S together with the air A and a moving path of the steel plate S from the preceding cooling apparatus 100, And a plated steel plate after-cooling device 200 provided downstream of the pre-cooling device 100 to cool the steel plate S cooled by the preceding cooling device 100.

Such a plating steel plate preceding cooling apparatus 100 and the coated steel plate following cooling apparatus 200 can improve the cooling rate for the steel sheet S coated with the plating solution L, The sequin pattern that can be formed in the solution L can be made finer.

In other words, as shown in Fig. 10 (b), as compared to the case where the cooling rate is not secured conventionally as shown in Fig. 10 (a), the present invention can provide a cooling rate capable of finely dividing the sequin pattern It is.

In addition, as the cooling capacity is improved by the preceding cooling apparatus 100 and the succeeding cooling apparatus 200, the cooling and solidifying time of the plating solution L applied to the steel sheet S can be shortened, It is possible to miniaturize the plating facility.

The plated steel plate preceding cooling apparatus 100 is an apparatus for cooling the steel plate S coated with the plating solution L at an initial stage in which the steel plate S is discharged from the plating vessel 300, Cooling is performed.

In other words, the preceding cooling apparatus 100 of the plating apparatus according to an embodiment of the present invention may be configured such that the steel plate S discharged from the plating vessel 300 at a temperature higher than the melting temperature of the plating solution L, Cooling the plating solution L on the surface of the plating solution L and transferring the plating solution L to the post-cooling apparatus 200 at a temperature lower than at least the melting temperature of the plating solution L, .

That is, the preceding cooling apparatus 100 transfers the steel sheet S to the trailing cooling apparatus 200 after the coagulation of the plating solution L is performed to some extent, It is possible to prevent a recessed pit mark from being generated in the plating layer by the cooling water used for cooling.

The plated steel plate following cooling apparatus 200 is a device for cooling the plated layer of the partially coagulated steel sheet S cooled by the plated steel plate preceding cooling apparatus 100 to finish the cooling of the plated layer do.

In other words, the post-cooling apparatus 200 of the plating apparatus according to an embodiment of the present invention is characterized in that the plating solution L adhered to the outer surface of the steel sheet S has a temperature lower than the melting temperature of the plating solution L And the cooling water is supplied to the steel plate S from the pre-cooling device 100, and the cooling water having polarity is charged by charging to perform the cooling.

To this end, the plated steel plate following cooling apparatus 200 is positioned behind the moving path of the steel plate S from the plated steel plate preceding cooling apparatus 100. That is, the steel plate S is discharged from the plating tank 300, passes through the plated steel plate preceding cooling apparatus 100 firstly, and then passes through the plated steel plate following cooling apparatus 200 secondarily .

A layout in which at least one path is changed is formed instead of forming a moving path for coating the plating solution L on the steel sheet S and cooling the same, Thereby making it possible to miniaturize the plating facility which must include the path.

For example, the path of the steel sheet S may be formed as a 'C' shaped path opened toward the ground.

In other words, the trailing cooling device of the plating facility according to an embodiment of the present invention may include a first region in which the movement path of the steel plate moves upward of the plating bath, a first region connected to the first region, And a third region connected to the second region and having a movement path of the steel sheet moving downward.

In order to completely solidify the plating layer formed by the plating solution L after cooling the plating layer formed on the steel sheet S in the post-cooling apparatus 200, The water-cooling apparatus 600 may be further provided at the outlet side of the water-

That is, the plating apparatus according to an embodiment of the present invention is provided after the trailing cooling apparatus 200 in the course of the movement of the steel sheet S, and the plating solution L coated on the outer surface of the steel sheet S And a water cooling apparatus 600 that receives the steel sheet S from the post-cooling apparatus 200 and performs underwater cooling when the steel sheet S is completely solidified by the post-cooling apparatus 200.

The water-cooling apparatus 600 includes a water-cooling unit 610 for supplying cooling water to the steel sheet S to perform cooling, a drying unit 620 for drying the steel sheet S discharged from the water-cooling unit 610, ).

In the case of the plating vessel 300, the plating solution L is applied to the steel sheet S. To this end, the plating tank 300 is provided with a plating solution L such as a molten zinc solution, and a pot roll 400 for guiding the movement of the steel sheet S may be provided.

An air knife 500 is provided at a position between the plating bath 300 and the plated steel plate preceding cooling apparatus 100 to adjust the thickness of the plating solution L applied to the plating bath 300 Lt; / RTI >

In other words, the plating apparatus according to an embodiment of the present invention can adjust the thickness of the plating solution L on the steel plate S by adjusting the thickness of the plating solution 300 on the moving path of the steel plate S, And an air knife 500 provided between the preceding cooling apparatuses 100.

Particularly, the plated steel plate preceding cooling apparatus 100 injects fine moisture particles formed using ultrasonic waves together when cooling the steel sheet S coated with the plating solution L by air (A) , It is possible to prevent the formation of a recessed pit mark in the non-solidified plated layer and to improve the cooling ability. The description thereof will be described later in detail with reference to FIG. 2 to FIG.

In addition, when the plated steel plate preceding cooling apparatus 100 includes the filter unit 140, the difference in the mobile inertia force depending on the size of the mist particles formed by the ultrasonic unit 130 can be used, The size of the particles can be adjusted, and the efficiency of preventing the formation of the pit marks can be further enhanced. This will be described in detail later with reference to FIG.

FIG. 2 is a front view of a plating apparatus according to an embodiment of the present invention. FIG. 2 is a front view illustrating a plating apparatus according to an embodiment of the present invention. Referring to FIG. 2, A preceding body unit 110 provided on the movement path of the steel plate S wound on the steel plate S and an air injection unit 120 provided on the preceding body unit 110 and spraying air A onto the steel plate S, And an ultrasonic unit 130 which is provided in the preceding body unit 110 and injects cooling water into the steel plate S along the air A injected from the air injection unit 120 by forming mist .

That is to say, the plating steel plate preceding cooling apparatus 100 according to the present invention simultaneously injects the cooling water mist formed by the ultrasonic unit 130, thereby preventing the non-coagulating plating solution L from leaking out during the cooling of the plating solution L by the air A. [ So that it is possible to prevent the formation of the recessed pit marks and to improve the cooling performance.

Here, the preceding body unit 110 serves as a body provided with the air injection unit 120 and the ultrasonic unit 130. In addition, the cooling water mist provided by the ultrasonic unit 130 and the air A provided by the air injection unit 120 are sprayed together with the plating solution L on the steel plate S coated with the plating solution L. For this purpose, the preceding body unit 110 may include a leading frame part 111, a slit nozzle part 112, and a leading air curtain part 113, which will be described in detail with reference to FIGS. 4 and 5 Will be described later.

The preceding body unit 110 is installed in the plating vessel 300 so that the plating unit 300 can cool the steel plate S discharged from the plating vessel 300 Is provided on the movement path of the steel sheet S on which the non-solidified plating solution L is coated.

The air injection unit 120 serves to spray the air A to cool the non-solidified plating solution L on the steel sheet S. For this purpose, the air injection unit 120 may include an air supply unit 121, and may be a temperature control unit that can adjust the temperature of the air A to a low temperature or a high temperature in order to increase the cooling efficiency by injection of air (A) (122), which will be described later in detail with reference to FIG.

The ultrasonic unit 130 serves to provide a cooling water mist to the air A to increase the cooling ability of the air A injected from the air injection unit 120.

Here, the ultrasonic unit 130 forms the cooling water by the ultrasonic vibration, and the thus formed mist is introduced into the slit of the preceding body unit 110 together with the air A supplied from the air injection unit 120 And is supplied to the nozzle unit 112 to be sprayed to the plating solution L deposited on the steel plate S.

For this purpose, the ultrasonic unit 130 may include a leading container unit 131, an ultrasonic wave generator 132, and a mist guide unit 133.

In other words, the ultrasonic unit 130 of the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention includes a preceding container unit 131 provided in the preceding body unit 110 and provided with cooling water, An ultrasonic wave generator 132 provided in the leading vessel 131 for generating ultrasonic waves by vibrations to form the cooling water as a mist; and a mist provided on the upper side of the preceding vessel 131, And a mist guide portion 133 for guiding the steel sheet S to a position where the steel sheet S is provided.

The leading vessel unit 131 is provided with the cooling water to be formed as mist when the ultrasonic wave generator 132 generates vibration. The leading vessel unit 131 is provided in the preceding body unit 110.

The pipeline to be supplied with the cooling water W from the outside may be connected to the leading vessel unit 131.

The ultrasonic wave generator 132 serves to form an ultrasonic vibration for forming the cooling water as a mist, and is provided inside the preceding container 131 provided with the cooling water.

The ultrasonic wave generator 132 is formed of a material such as metal, quartz, or ceramics, which is electrically connected to a voltage source and converts electric energy supplied from a voltage source to vibration energy to form ultrasonic vibrations.

When the cooling water supplied to the lead vessel 131 is formed into a mist by the ultrasonic vibration provided by the ultrasonic wave generator 132, the mist guide part 133 flows to the slit nozzle part 112 And the role of the guide.

The fog guide part 133 is formed in the shape of a cap at the upper end of the leading container part 131 and is formed in a direction toward the slit nozzle part 112, A flange extending toward the slit nozzle portion 112 is formed.

In particular, a filter unit 140, which will be described later, is provided between the fog guide unit 133 and the slit nozzle unit 112 to adjust the size of the fog particles. The fog particles provided to the slit nozzle unit 112 As shown in FIG.

3 is a front view showing an embodiment in which the temperature regulation unit 122 of the air injection unit 120 is provided outside the air supply unit 121 in the plated steel plate preceding cooling apparatus 100 of the present invention, The air injection unit 120 of the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention is provided in the preceding body unit 110 and receives the air A from the outside, And a temperature control unit 122 provided in the air supply unit 121 and adapted to control the temperature of the air A. [

That is, the air temperature adjusting unit 122 may include a temperature control unit 122 that can adjust the temperature of the air A to a low temperature or a high temperature in order to increase the cooling efficiency by the air (A) injection.

The air supply unit 121 serves to supply the air A to the slit nozzle unit 112 and the air supply unit 121 can receive the high pressure air A from the outside. For this purpose, the air supply unit 121 may be connected with a pipe to receive the air A.

The air temperature regulator 122 controls the temperature of the air A supplied from the air supply unit 121 and is provided as a cooling tube for forming the air A at a low temperature .

The temperature control unit 122 is provided inside the air supply unit 121 to directly contact the air A provided by the air supply unit 121 to increase the temperature control efficiency of the air A. [ An example of this is shown in Fig.

In this case, since the flow path of air (A) flowing in the air supply unit 121 is not blocked, the temperature control unit 122 may be provided outside the air supply unit 121, The flow rate of the air A can be maintained. An example of this is shown in FIG.

In addition, the air injection unit 120 may further include an air amount adjusting unit 123 to adjust the amount of air to be transferred from the outside to the air supplying unit 121.

That is, the air injection unit 120 of the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention is provided in the air supply unit 121 and is provided to regulate the flow rate of air delivered from outside And an air amount adjusting unit 123.

The provision of the air amount control unit 123 can control the amount of air injected from the slit nozzle unit 112 of the preceding body unit 110 to the steel plate S, 130 in order to cool the plating solution of the steel sheet S to a desired temperature by adjusting the cooling capability to be set.

FIG. 4 is a perspective view illustrating a plated steel plate preceding cooling apparatus 100 according to the present invention. Referring to FIG. 4, the preceding body unit 110 of the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention, A front frame part 111 provided on the movement path of the steel strip S and a front frame part 111 facing the steel strip S, And a slit nozzle portion 112 provided at a width at least greater than the width of the steel sheet S so as to jet the air A supplied from the ultrasonic unit 130 to the steel sheet S, have.

The reason why the preceding body unit 110 includes the leading frame unit 111 and the slit nozzle unit 112 is that the air A supplied from the air injection unit 120 and the air supplied from the ultrasonic unit 130 And serves to spray the cooling water mist provided together with the steel sheet S on which the plating solution L is coated.

The preceding frame part 111 is a basic structure in which the air injection unit 120 and the ultrasonic unit 130 are provided and the slit nozzle part 112 is composed of the air A and the fogged plating solution L As shown in FIG.

The slit nozzle unit 112 is formed in a long hole shape having a width larger than the width of the steel sheet S so as to uniformly spray the air A and the mist particles in the width direction of the steel sheet S, And is configured to uniformly perform cooling for the solidification plating solution (L).

5 is a front view showing an embodiment in which the preceding body unit 110 in the plated steel plate preceding cooling apparatus 100 of the present invention includes the preceding air curtain 113. Referring to FIG. 5, The preceding body unit 110 of the plated steel plate preceding cooling apparatus 100 according to the present invention is provided at a peripheral portion of the slit nozzle unit 112 and guides the air A and mist to be sprayed to the steel plate S And a leading air curtain portion 113 for supplying air to the air curtain.

The reason why the preceding body unit 110 includes the preceding air curtain unit 113 is that the air A provided by the air injection unit 120 and the cooling water mist provided by the ultrasonic unit 130 are mixed with each other, This is for controlling the position to be sprayed when the plating solution L is applied to the steel sheet S.

For this, the preceding air curtain 113 may be provided at a peripheral portion of the slit nozzle portion 112, and may be provided to surround the peripheral portion of the slit nozzle portion 112.

In order to form the air curtain, the preceding air curtain 113 may be provided with a pipe to which air A is supplied from the outside. In this way, It is possible to control the path of the fog particles and the air A injected from the slit nozzle portion 112 by spraying the fog particles from the peripheral portion.

6 is a front view showing an operating state of the filter unit 140 in the plated steel plate preceding cooling apparatus 100 of the present invention. Referring to FIG. 6, the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention And a filter unit 140 provided in the preceding body unit 110 for adjusting the size of fog particles to be sprayed on the steel sheet S. [

In other words, the filter unit 140 can adjust the size of mist particles to be injected into the plating layer by using the difference of the mobile inertia force according to the size of the mist particles formed by the ultrasonic unit 130.

For this purpose, the filter unit 140 may include a filter frame 141 and a regulating plate 142. That is, the filter unit 140 of the plated steel plate preceding cooling apparatus 100 according to the embodiment of the present invention is provided on the flow path of mist formed in the ultrasonic unit 130, and the preceding body unit 110 A filter frame part 141 provided in the filter frame part 141 coupled to the filter frame part 141, and a flow path of a part of the mist particles is provided to change the remaining mist particles, 142).

Here, the filter frame unit 141 is a basic frame of the filter unit 140 and is provided in the preceding body unit 110. More specifically, the filter frame unit 141 is provided with the mist guide (133) and the slit nozzle part (112).

The regulating plate portion 142 is provided in the filter frame portion 141 to partially change the flow path of mist particles flowing through the filter frame portion 141. In other words, if the throttle plate 142 is configured to partially change the flow path of the mist particles, the particles be relatively large in the inertia force of the mist particles may not change the flow path, Only the path is changed, thereby causing the control plate portion 142 to collide.

As a result, the collided particles be can not move to the slit nozzle part 112, and the particle size becomes larger as the toner is accumulated in the regulating plate part 142, and falls into the leading container part 131.

On the other hand, among the mist particles that have been flowing, the particles se having relatively small inertia force do not collide with the regulating plate portion 142 as they move and change the flow path enough to not collide with the regulating plate portion 142, So that it can be moved to the slit nozzle portion 112.

On the other hand, since the inertia force is proportional to the mass of the particles, the size of the mist particles to be provided to the slit nozzle unit 112 can be adjusted.

For this, a plurality of the regulating plate portions 142 may be provided in the filter frame portion 141 at regular intervals.

That is, a plurality of the regulating plate portions 142 of the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention may be provided in the filter frame portion 141 at regular intervals.

With such a configuration, the fog particles guided and guided by the mist guide portion 133 can be efficiently filtered.

The regulating plate portion 142 of the plated steel plate preceding cooling apparatus 100 according to an embodiment of the present invention may be provided obliquely to the flow path of the mist particles.

The reason why the throttle plate is obliquely provided in the flow path of the mist particles is to adjust the degree of change of the flow path of the mist particles.

In other words, if the degree of tilting of the throttle plate is large, the rate of change of the flow path of the fog particles becomes larger, so that only relatively small particles pass through and are supplied to the slit nozzle unit 112. If the degree of tilting is small, Since the rate of change of the flow path of the particles is small, it can be controlled to be supplied to the slit nozzle portion 112 through relatively large particles.

In order to change the degree of tilting of the throttle plate, the degree of tilting may be replaced with another filter unit 140, but the tilting degree may be replaced by an angle adjusting motor or the like to adjust the angle of the throttle plate.

FIG. 7 is a front view showing a plating-steel following cooling apparatus 200 according to the present invention. Referring to FIG. 7, the plating-steel following cooling apparatus 200 according to an embodiment of the present invention includes a plating solution L A trailing body unit 210 provided on a moving path of a partly solidified steel plate S and a cooling water spraying unit provided in the trailing body unit 210 for spraying cooling water to the steel plate S by air pressure, And a charging unit 230 provided in the trailing body unit 210 integrally with the cooling water injection unit 220 and charging the cooling water to impart polarity to the cooling water.

As described above, the coated steel plate after-cooling apparatus 200 of the present invention is provided with the charging unit 230 integrally with the cooling water injection unit 220 through which the cooling water is injected, so that the cooling water can be injected after the polarity is imparted.

Accordingly, since the charging efficiency of the cooling water can be increased, the deposition rate of the cooling water on the plating layer on the steel sheet S can be increased and the cooling efficiency can be increased.

Here, the trailing body unit 210 serves as a body provided with the cooling water injection unit 220 and the charging unit 230, and the plating solution L may be a part of the steel sheet S coated with the plated layer And is provided on the movement path.

The trailing body unit 210 may include a trailing frame portion 211 and a trailing air curtain portion 212 to control the jetting area of the cooling water jetted from the cooling water jetting unit 220, A detailed description will be given later with reference to Fig.

The cooling water spray unit 220 serves to spray the cooling water to the steel plate S. To this end, the cooling water spray unit 220 includes a flow path portion 221, a trailing container portion 222, (223), and an air pressure providing unit (224).

Particularly, the passage portion 221 serves to transfer the cooling water to be sprayed from the trailing container portion 222 to the spot nozzle portion 223. At this time, a part of the flow passage portion 221 is connected to the charging unit 230, the cooling water to be injected can be charged and jetted to the same electrode. A detailed description thereof will be described later.

The trailing container portion 222 is provided with cooling water to be sprayed, and may be connected to a supply pipe for receiving cooling water W from the outside, and some of the stored cooling water may be discharged through a drain pipe. However, most of the stored cooling water is transferred to the spot nozzle part 223 through the flow path part 221 and sprayed to the steel plate S.

Here, the trailing container portion 222 is grounded at the ground, and is constituted by the material of the conductor, so that it can perform a function of receiving a negative charge at the ground or discharging a negative charge at the time of charging the cooling water .

In particular, since the cooling water in the trailing container portion 222 is charged with the same polarity by the electrode portion 232 to be described later, it is possible to prevent the problem that the charging polarity is canceled in the middle of the injection of the cooling water.

The spot nozzle unit 223 serves to spray the cooling water transferred from the trailing container unit 222 through the flow path unit 221 to the steel plate S. [

Here, the spot nozzle unit 223 may include a hole having a shape in which the injection path of the cooling water to be injected is gradually reduced, thereby increasing the injection speed of the cooling water to be injected.

In addition, the spot nozzle unit 223 may be provided as a spray nozzle capable of widening the spray area of the cooling water to be sprayed.

As described above, the cooling water spraying unit 220 of the coated steel plate after-cooling apparatus 200 according to an embodiment of the present invention is provided in the trailing body unit 210 and is grounded to the ground, And a spot nozzle unit 223 connected to the container unit 222 and the flow path unit 221 to receive the cooling water from the trailing container unit 222 and to spray the cooling water to the steel plate S .

In addition, a plurality of the spot nozzles 223 may correspond to the width of the steel sheet S, and a detailed description thereof will be described later with reference to FIG.

The pressure providing unit is provided to increase the spraying power of the cooling water transferred from the trailing container unit 222 to the spot nozzle unit 223 through the flow path unit 221.

In other words, the cooling water may be sprayed from the spot nozzle unit 223 only by the spraying force caused by the flow of the cooling water, but the air pressure providing unit 224 may further be provided to further increase the spraying power of the cooling water.

In other words, the cooling water injection unit 220 of the plated steel plate following cooling apparatus 200 according to an embodiment of the present invention is connected to the spot nozzle unit 223, (224) for providing the air pressure (A).

The air pressure providing unit 224 may be configured to receive the air A from the outside through the piping and to supply the received air A to the spot nozzle unit 223, (A) flow path that communicates with the outlet (223) can be formed.

The charging unit 230 is configured to be injected in a charged state so that the cooling water can have a polarity.

To this end, the charging unit 230 is provided integrally with the cooling water injection unit 220 and is provided in the trailing body unit 210.

Particularly, the charging unit 230 is positioned behind the part of the flow path 221 of the cooling water injection unit 220 in the direction of spraying the cooling water, so that the cooling water to be sprayed can be formed in the same polarity and sprayed. A detailed description thereof will be described later.

8 is a front view showing a magnetic field formed by the charging unit 230 in the coated steel plate after-cooling apparatus 200 according to the present invention. Referring to FIG. 8, the coated steel plate after-cooling apparatus 200 The charging unit 230 of the trailing body unit 210 includes an electrode part 232 provided in the electrode supporting part 231 and the electrode supporting part 231 of the trailing body unit 210, And at least a part of the flow path portion 221 of the cooling water injection unit 220 through which the cooling water flows is provided in front of the electrode portion 232 with respect to the cooling water injection direction, And the cooling water is charged to the same polarity.

In other words, the flow path unit 221 serves to transfer the cooling water to be sprayed from the trailing container unit 222 to the spot nozzle unit 223. At this time, the charging unit 230 is connected to the flow path unit 221 So that the cooling water to be injected can be injected by being charged by the same electrode.

That is, by charging the cooling water at a polarity opposite to that of the polarity of the electrode unit 232, the entire cooling water can be charged and discharged with the same polarity.

The electrode support part 231 serves to support the electrode part 232 so as to be integrally formed with the cooling water injection unit 220.

The electrode support part 231 may be provided in the trailing body unit 210 provided with the cooling water injection unit 220 and may include the electrode part 232 therein.

The high voltage generator PS is grounded to the ground and the electrode unit 232 is connected to the high voltage generator PS for applying external static electricity to the static electricity generator. The electrode unit 232 can maintain a state where a positive charge is applied to the positive electrode (+) or the negative electrode (-) by applying a high voltage in a state where the positive electrode (232) is connected.

For example, in order to apply the electrode unit 232 to the positive electrode of the positive electrode (+), the high voltage generator PS discharges the negative charge existing in the electrode unit 232 through the ground.

When the electrode part 232 is applied to the positive electrode of the positive electrode (+), the cooling water provided in the flow part 221 adjacent to the electrode part 232 is charged to the negative (-), The cooling water is increased in adhesion force to be adhered to the steel sheet, thereby enhancing the cooling ability.

Here, the cooling water is charged because the trailing container portion 222 connected to the flow path portion 221 is grounded and receives a negative charge from the ground and transfers the negative charge to the cooling water, .

8 is a perspective view illustrating a coated steel plate post-cooling apparatus 200 according to the present invention. Referring to FIG. 8, the spot nozzle unit 223 of the post-plated steel plate post-cooling apparatus 200 according to an embodiment of the present invention, And a plurality of steel plates (S) having a width greater than the width of the steel sheet (S) are provided.

This is for uniformly cooling the steel sheet S. In other words, in order to form a uniform cooling effect by spraying the charged cooling water on the whole width of the steel strip S, a plurality of spot nozzle portions 223 are provided in the width direction of the steel strip S Respectively.

9 is a front view showing an embodiment in which the trailing body unit 210 includes a trailing air curtain part 212 in the coated steel plate after-cooling apparatus 200 of the present invention. Referring to FIG. 9, The trailing body unit 210 of the plated steel plate traverse cooling apparatus 200 according to the present invention is provided on the trailing frame portion 211 provided on the moving path of the steel sheet S and in the peripheral portion of the spot nozzle portion 223 And a trailing air curtain part 212 for guiding the cooling water to the steel sheet S, as shown in FIG.

The trailing body 210 includes the trailing air curtain 212 so as to control the injection area of the cooling water injected from the cooling water injection unit 220.

In other words, when the cooling water is sprayed from the spot nozzle unit 223, the following air curtain unit 212 shields the vicinity of the cooling water jetted by the air A to spray the cooling water, You can do it.

For this purpose, the trailing air curtain part 212 may be provided in connection with a pipe for receiving the air A from the outside.

Hereinafter, a plating method which is another embodiment of the present invention will be described.

In other words, the plating method according to another embodiment of the present invention includes a coating step of coating the plating solution L on the steel strip S, a mist formed by air and ultrasonic vibration on the steel strip S coated with the plating solution L And a post-cooling step of spraying cooling water on the plated steel sheet S to be cooled in the pre-cooling step and cooling it again.

Here, the coating step is performed by moving the plating vessel 300 while the steel plate S is supported by the pot roll 400 or the like.

That is, in the coating step, the plating solution L may be applied to the outer surface of the steel sheet S while the steel sheet S passes through the inside of the plating tank 300 containing the plating solution L.

The precooling step is a step of cooling the steel sheet S discharged from the plating tank 300. The precooling step may include cooling the plating solution L in a molten state by using the preceding cooling apparatus 100, Air is sprayed in order to prevent a recessed pit mark or the like at the time of solidification from occurring. In addition, in order to increase the cooling ability, a fog which is a finer form of the cooling water is sprayed together with the ultrasonic vibration.

Accordingly, in the precooling step, the formation of the pit marks, which can be formed while the plating solution L is solidified, can be prevented while enhancing the cooling ability as compared with the case of spraying only the air.

Further, the pre-cooling step of the plating method according to another embodiment of the present invention may include cooling the plating solution L on the surface of the steel sheet S formed at a temperature higher than at least the melting temperature of the plating solution, The plating solution L is cooled to a temperature lower than the melting temperature of the plating solution L and transferred to the post-cooling step.

In other words, since the post-cooling step does not spray the fine fog by the ultrasonic vibration, if the plating solution L is not performed after the solidification, The plating solution L may be cooled to a temperature lower than the melting temperature of at least the plating solution L and transferred to the post-cooling step.

The post-cooling step is a step of cooling the plating solution L and the steel sheet S primarily by using the preceding cooling apparatus 100 in the pre-cooling step, (L) and the steel plate (S).

Particularly, in the post-cooling step, since the plating layer cooled to a temperature lower than the melting temperature of the plating solution (L) is transferred to the precooling step to perform cooling, it is necessary to consider the problem that a pit mark is formed in the plating layer So that the cooling water can be cooled while spraying without making the cooling water finer.

In addition, the aftercooling step of the plating method according to another embodiment of the present invention is a method in which the coated steel sheet cooled at a temperature lower than the melting temperature of at least the plating solution is received in the precooling step, And cooling is performed by injecting cooling water to which polarity is imparted.

As a result, the adhesion of the cooling water to the steel sheet (S) or the plating layer is increased, and the cooling performance can be increased.

100: Plated steel plate preceding cooling apparatus 110: Lead body unit
111: leading frame portion 112: slit nozzle portion
113: preceding air curtain section 120: air injection unit
121: air supply unit 122: temperature control unit
123: air volume regulator 130: ultrasonic unit
131: lead vessel part 132: ultrasonic wave generator part
133: mist guide part 140: filter unit
141: filter frame part 142:
200: Plated steel plate after cooling system 210: Trailing body unit
211: trailing frame portion 212: trailing air curtain portion
220: Cooling water injection unit 221:
222: trailing container portion 223: spot nozzle portion
224: air pressure supply unit 230: charging unit
231: Electrode supporter 232: Electrode
300: plating bath 400: pot roll
500: air knife 600: water-cooling device
610: Water cooling section 620: Drying section

Claims (25)

A plating tank through which a steel sheet passes through a plating solution;
A plated steel plate preceding cooling device provided on an outlet side from which the steel plate is discharged from the plating bath, and forming cooling water in the form of mist by ultrasonic vibration and spraying the steel plate together with air; And
A post-cooling steel plate post-cooling device provided downstream of the preceding steel plate moving path and cooling the steel plate cooled by the preceding cooling device;
/ RTI >
The pre-cooling device
A preceding body unit provided on an outlet side from which the steel plate is discharged from the plating vessel;
An air injection unit provided in the preceding body unit for spraying air to the steel plate;
An ultrasonic unit provided in the preceding body unit and configured to form cooling water as a mist, and to jet the air injected from the air injection unit to the steel plate; And
A filter unit provided in the preceding body unit for adjusting the size of fog particles to be sprayed on the steel plate;
≪ / RTI > The method according to claim 1,
Wherein the preliminary cooling device performs cooling of a plating solution on a surface of a steel sheet discharged from the plating bath at a temperature higher than at least the melting temperature of the plating solution and at least a temperature lower than a melting temperature of the plating solution, Is cooled and transferred to the post-cooling device. delete The method according to claim 1,
The ultrasonic unit includes:
A preceding container unit provided in the preceding body unit and provided with cooling water;
An ultrasonic generator provided in the preceding container unit to generate ultrasonic waves due to vibration to form the cooling water as a mist; And
A fog guide provided at an upper side of the preceding container portion and guiding a formed mist to a position where the steel plate is provided;
≪ / RTI > The method according to claim 1,
The air injection unit includes:
An air supply unit provided in the preceding body unit and configured to receive air from the outside and to inject the air into the steel plate; And
A temperature control unit provided in the air supply unit and provided to control the temperature of the air;
≪ / RTI > 6. The method of claim 5,
The air injection unit includes:
An air amount adjusting unit provided in the air supply unit and provided to adjust a flow rate of air delivered from the outside;
≪ / RTI > The method according to claim 1,
Wherein the preceding body unit comprises:
A leading frame part provided on a moving path of the steel plate; And
A slit provided at a front end of the preceding frame portion facing the steel plate and provided with a width larger than the width of the steel plate so as to spray the air provided by the air injection unit and the mist provided by the ultrasonic unit to the steel plate, A nozzle unit;
≪ / RTI > 8. The method of claim 7,
Wherein the preceding body unit comprises:
A preceding air curtain provided at a periphery of the slit nozzle unit and guiding the air and the mist to be sprayed to the steel plate;
≪ / RTI > delete The method according to claim 1,
The filter unit includes:
A filter frame provided on the flow path of the mist formed in the ultrasonic unit and provided to be coupled to the preceding body unit;
A regulating plate provided in the filter frame part, wherein the flow path of some of the mist particles is provided for changing and the remaining mist particles are provided in a collision by a mobile inertia force;
≪ / RTI > 11. The method of claim 10,
Wherein a plurality of the regulating plate portions are provided at predetermined intervals in the filter frame portion. 12. The method of claim 11,
Wherein the throttle plate is provided obliquely to the flow path of the mist particles. The method according to claim 1,
The post-cooling device is a cooling device for cooling the plating solution coated on the outer surface of the steel plate at least to a temperature lower than the melting temperature of the plating solution, And performing cooling by spraying. 14. The method of claim 13,
The post-
A trailing body unit provided behind the movement path of the steel plate than the preceding cooling unit;
A cooling water injection unit provided in the trailing body unit and configured to inject cooling water into the steel plate by air pressure; And
A charging unit provided in the trailing body unit integrally with the cooling water injection unit, for charging the cooling water to impart polarity to the cooling water;
≪ / RTI > 15. The method of claim 14,
The charging unit includes:
An electrode supporter provided in the trailing body unit; And
An electrode unit provided on the electrode support unit and forming an electric field by applying a static charge;
/ RTI >
Wherein at least a part of a flow path portion of the cooling water injection unit through which the cooling water flows is provided in front of the electrode portion with respect to the cooling water injection direction so as to charge the cooling water provided in the flow path portion with the same polarity. 16. The method of claim 15,
The cooling water jetting unit includes:
A trailing container unit provided in the trailing body unit and grounded on the ground and provided with cooling water; And
A spot nozzle part connected to the flow path part and receiving cooling water from the trailing container part and spraying the cooling water to the steel plate;
≪ / RTI > 17. The method of claim 16,
Wherein the spot nozzle portion is provided with a plurality of regions each having a width larger than a width of the steel plate. 17. The method of claim 16,
The cooling water jetting unit includes:
An air pressure providing unit communicating with the spot nozzle unit and providing air to increase an injection pressure of the cooling water;
≪ / RTI > 17. The method of claim 16,
Wherein the trailing body unit comprises:
A trailing frame portion provided on the movement path of the steel plate; And
A trailing air curtain provided at a periphery of the spot nozzle unit and guiding the cooling water to the steel plate;
≪ / RTI > The method according to claim 1,
Wherein the steel plate is provided after the moving path of the steel plate, and when the plating solution clad on the outer surface of the steel plate is completely solidified by the trailing cooling device, the steel plate is received by the trailing cooling device, Device;
≪ / RTI > The method according to claim 1,
An air knife provided between the plating tank and the preceding cooling device on the movement path of the steel plate so as to adjust the thickness of the plating solution on the steel plate;
≪ / RTI > The method according to claim 1,
Wherein the trailing cooling apparatus includes a first region in which the movement path of the steel sheet moves upward of the plating tank, a second region connected to the first region and in which the movement path of the steel sheet horizontally moves on the ground, And a third region where the moving path of the steel sheet moves downward. delete delete delete

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