JP2951177B2 - Metal strip hot dip coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal strip hot dip plating apparatus capable of continuously performing a uniform plating process.

[0002]

2. Description of the Related Art Generally, in hot-dip plating of steel strip (metal strip), "dross" which is liable to be generated in a plating solution in a plating bath tub adheres to the surface of the steel strip and causes a remarkable deterioration in quality. Rather, the plating surface is not formed uniformly due to various changes in the temperature and component concentration of the molten plating solution in the plating bath, and the production rate must be reduced to reduce this adverse effect. Countermeasures have become a very important issue.

Therefore, in a conventional metal hot-dip plating apparatus,
A technique of removing dross by directly spraying a hot-dip plating solution collected at a predetermined location in a plating bath on the surface of a steel strip is employed.

[0004]

However, in the above-mentioned conventional apparatus, a hot-dip plating solution containing dross is sprayed on the surface of the steel strip, and the dross adheres to the surface of the steel strip, thereby deteriorating the quality. Problem. Therefore, the present invention has been made in view of the above-mentioned unsolved problem, and does not cause dross to adhere to the surface of the metal strip, and is capable of forming a high-quality plating treatment surface. It is intended to provide a device.

[0005]

To achieve the above object, according to the Invention The metal strip hot dip plating apparatus of the present invention is reservoir melt plating solution, and a main tub metal strip is continuously immersed, is dross Not contained, prescribed temperature adjustment and
Storing a new hot-dip plating solution whose concentration has been adjusted to a predetermined component ratio , and a sub-tub disposed outside the main bath;
The new hot-dip plating solution in the sub bath is
A supply unit for spraying the surface of the metal strip .

[0006]

According to the metal strip hot-dip plating apparatus of the present invention, a new hot-dip plating apparatus that does not contain dross supplied from a sub-tub disposed outside the main bath on the surface of the metal strip in the main bath. > The hot-dip plating solution is sprayed continuously. This allows gold
Since the new hot-dip plating solution is sprayed on the surface of the metal strip, dross does not adhere to the surface of the metal strip, and the metal strip maintains the plating surface with high quality.

[0007] The new hot-dip plating solution stored in the sub-bath is subjected to predetermined temperature adjustment and predetermined component adjustment.
Since it supplied continuously during the main bath through a supply means Te, melt plating solution in the main bath also made automatically temperature adjustment and component adjustment, thereby always plated metal strip
Processing is performed with high quality.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In a main bath 1 shown in FIG. 1, a hot-dip plating solution 2 containing zinc (Zn) as a main component and aluminum (Al) in a predetermined ratio is stored, and a sink roll 3 in the bath is stored.
The steel strip 4 is continuously immersed in the main bathtub 1 at a predetermined speed in the direction of the arrow while being guided.

In the main bath 1, a header section 6 is provided at a position facing the steel strip 5 in the hot-dip plating solution 2, with each nozzle facing the surface of the steel strip. The means 6 is supplied with a hot-dip plating solution from a sub bath 7 via a supply line (supply means) 8. The sub bath 7 is supplied with a predetermined amount of raw materials such as zinc and aluminum from the supply unit 10 while the supply control is being performed by the controller 9, and the heater 1 disposed in the entire area of the bath.
1 is also configured so that heating control is performed by the controller 9. Then, the controller 9 performs control based on heating information in the tank and component information of zinc, aluminum and the like obtained from the temperature sensor 12 and the concentration sensor 12 disposed in the tank, and determines a predetermined temperature and a predetermined component. Hot-dip plating solution with a ratio and containing no dross
It is called a new plating solution. ) 14 is stored in the sub bath 7.

According to the metal strip hot dip coating apparatus having the above-described structure, when the steel strip 4 is continuously immersed at a predetermined speed and the plating process is performed in the main bath 1, the pump of the supply line 8 is controlled by the controller 9. 8a is driven and the sub bath 7
Is sprayed from the nozzle of the header 6 through the supply line 8. As a result, dross near the steel strip 4 is removed by spraying the new plating solution 14, and dross is not contained in the new plating solution. There is no adhesion and no deterioration in quality.

A new plating solution 1 which is continuously set at a predetermined temperature from the sub bath 7 and has a predetermined component ratio.
4 is supplied, the molten plating solution 2 in the main bath 1
The steel strip 4 can be formed with a high quality plated surface on the surface of the steel strip 4 without lowering the temperature or changing the component ratio. That is, as shown in FIG. 2, the normal plating surface is such that an aluminum-enriched layer 15 having a predetermined thickness is uniformly formed on the surface of the steel strip 4, and a zinc layer having a predetermined thickness is formed on the aluminum-enriched layer 15. Although the plating layer 16 must be formed uniformly, in the present embodiment, as shown by the solid line in FIG. You.
Further, since the aluminum-enriched layer 15 is uniformly formed with a predetermined thickness, the alloying ratio in the galvanized layer 16 is always constant as shown by the solid line in FIG. . The percentage of alloying in the conventional aluminum-enriched layer and zinc-plated layer is shown by broken lines in FIGS. Therefore, the steel strip 4 that has been subjected to the plating treatment according to the present embodiment is a plated steel sheet having improved powdering properties that are advantageous in workability and peeling resistance.

Therefore, the apparatus according to the present embodiment has a predetermined temperature and a predetermined component ratio supplied from the sub-tub 7 where the steel strip 4 is not immersed and dross does not occur on the surface of the steel strip 4 in the main bathtub 1. Is sprayed, the dross floating in the main bath 1 is separated from the surface of the steel strip 4 by the jet of the new plating solution 14 sprayed on the steel strip 4 and does not adhere to the surface. Thereby, the steel strip 4 has no possibility of impairing the appearance of the plating surface.

The new plating solution 14 in the sub bath 1 is continuously supplied into the main bath 1 with a predetermined temperature adjustment and a predetermined component adjustment. 2 is also automatically temperature- and component-adjusted, so that a high-quality plated steel strip 4 can be stably plated.

[0014]

As described above, according to the metal strip hot-dip plating apparatus of the present invention, a new hot-dip plating method that does not contain dross from the sub-tub on the surface of the metal strip in the main bath.
The dross floating in the main bathtub is separated from the surface of the metal strip by the jet of the new hot-dip plating solution sprayed on the surface of the metal strip and does not adhere to the surface because the sprayed liquid is continuously sprayed. The surface can be kept high quality.

The new hot-dip plating solution in the sub-tub is subjected to predetermined temperature adjustment and predetermined component adjustment, and
, The temperature and composition of the hot-dip plating solution in the main bath are also automatically adjusted, so that a high-quality plated metal plate can be stably and continuously formed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a metal strip hot dip coating apparatus of the present invention.

FIG. 2 is a view showing a plating layer on the surface of a metal strip.

FIG. 3 is a diagram showing a state of an aluminum-enriched layer formed on the surface of a metal strip.

FIG. 4 is a diagram showing the ratio of alloying in a galvanized layer formed on the surface of a metal strip.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main bath 2 Hot-dip plating solution 4 Metal strip (steel strip) 6 Header part (supply means) 7 Sub bath 8 Supply line (supply means) 8a Pump 9 Controller 10 Supply part 11 Heater 12 Temperature sensor 13 Concentration sensor 14 New plating solution (New hot-dip plating solution)

Claims (1)

(57) [Claims] 1. A molten plating liquid is reservoir, and a main tub metal strip is continuously immersed, dross is contained
No, temperature adjustment and concentration adjustment to the specified component ratio
Provided by reserving a new molten plating solution was made, and the sub bath is and disposed outside the main tub, and a supply means for blowing the new melt plating solution in the sub bath on the metal strip surface in the main bath Metal strip hot-dip plating apparatus characterized by the above-mentioned.