JPH04218656A - Hot-dip plating equipment and its operating method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanizing facility for steel strips and a method of operating the same.

0002

[Prior Art] For example, in a hot-dip galvanizing line for steel strips, a seal box is used and N2 wiping is performed for the purpose of preventing ZnO-based dross from adhering and improving the uniformity of the adhesion amount (Japanese Patent Publication No. 55-48102, Same 58-
No. 35590). In the conventional hot-dip plating equipment shown in FIG. After the amount of plating is adjusted by a plating amount adjusting device (gas wiping device) 4, it is sent to the next step.

[0003] Inside the seal box 5, Zn vapor and wiping splash adhere to and accumulate on the inner wall and come into contact with the strip, and the deposits disturb the airflow inside the seal box 5, causing more and more splash. There was a problem.

[0004] In order to prevent the generation of Zn vapor, Japanese Patent Application Laid-open No. 1983-
As shown in No. 41755, there is a method of controlling the dew point inside the seal box, but it has not been possible to completely prevent the adhesion of Zn vapor.

[0005]

As mentioned above, when the Zn vapor or splash deposited on the inner wall of the seal box comes into contact with the strip, scratches occur and the yield of the product decreases. In order to remove this deposit, it is necessary to stop the line, which causes problems in that the production volume decreases and defective parts occur due to the line stoppage. Also,
Once deposits are generated, the airflow within the seal box is disturbed, which makes splashing more likely, and the deposits quickly grow.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot-dip plating equipment for steel strips that prevents Zn vapor and splash from adhering to the inner wall of a seal box, and a method for operating the equipment.

[0007]

[Means for Solving the Problems] In order to achieve the above object, according to a first aspect of the present invention, a steel strip is immersed in a molten metal plating bath, and then a plating layer provided on the molten metal plating bath is coated. In a hot-dip plating equipment for passing a steel strip through a seal box having a quantity adjusting device, a vibrating means for imparting vibration to the seal box is provided on the outer wall of the seal box, and molten metal vapor or splash is applied to the inner wall of the seal box. Provided is a hot-dip plating equipment characterized in that it is configured to prevent the adhesion of.

According to a second aspect of the present invention, when operating the hot-dip plating equipment having the seal box with the vibration excitation means, the vibration excitation means applies vibrations of 10 cycles/sec or more to the seal box. A method of operating a hot-dip plating facility is provided.

The present invention will be explained in more detail below. First, the first aspect of the present invention will be explained.

FIG. 1 is a perspective view of the main parts of hot-dip plating equipment showing one embodiment of the present invention.

In the present invention, the seal box 5 is provided above the hot-dip metal plating bath 2 in which the steel strip 1 is immersed.

A device 4 (for example, a gas wiping device) for adjusting the amount of molten metal adhering to the steel strip 1 pulled up from the plating bath 2 is provided in the seal box 5. In the present invention, the vibration means 6 is provided on the outer wall of the seal box 5. As the vibration means 6, there is no need for anything special, and for example, a vibrator can be used. The vibration excitation means 6 may be of any type as long as it applies vibration to the seal box 5. The steel strip of the present invention is not particularly limited, and is applicable to alloy steel strips and non-alloy steel strips. Furthermore, hot-dip plating metals include, but are not limited to, metals mainly containing Zn and containing trace amounts of additional elements such as Al and Pb.

Next, a second aspect of the present invention will be explained.

In the present invention, when operating a hot-dip plating equipment having a seal box with an excitation means as explained in the first aspect of the present invention, the excitation means 6 provided on the seal box 5 causes the seal box 5 to be 10 cycles/
Hot-dip plating is performed in a state where vibrations of sec or more are applied. When the vibration is less than 10 cycles/sec,
As is clear from Table 1 of Examples described later, it is not possible to prevent molten metal from adhering to the inner wall of the seal box 5.

[0015]

[Operation] By attaching a vibrating means to the seal box and vibrating the seal box, adhesion of Zn vapor and splash to the inner wall of the seal box is prevented.

[0016] The vibration frequency is important because of the mechanism of preventing objects from sticking by vibration, and if the frequency is low, there is no effect. As shown in the examples, a vibration frequency of 10 cycles/sec or more is required.

[0017]

【Example】

The present invention will be specifically explained below based on examples.

(Example 1) Using the seal box of the present invention shown in FIG. 1, a strip (mild steel plate of 0.8 mm x 1250 mm) was hot-dipped under the following conditions while changing the frequency of the vibrator 6.

The deposition state of Zn or splash on the inner wall of the seal box during each plating was visually evaluated. The results are shown in Table 1.

[0021] Hot-dip metal plating bath………Zinc adhesion amount………45/45g/m2
Line speed......120mpm Seal box size...Length 1000mm x Width 3000mm x Height 1000mm Processing time......18hr vibration
Equipment……………………vibrator

[0022] This shows that the frequency of vibration is required to be 10 cycles/sec or more.

0023 Table 1

[0024]

[Effects of the Invention] Since the present invention is constructed as described above, by using the hot-dip plating equipment of the present invention, it is possible to eliminate scratches caused by deposits, which have been a problem in the past. .

Furthermore, since the method of the present invention prevents deposits from adhering to the inside of the seal box, the line can be operated without stopping.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of hot-dip plating equipment showing an embodiment of the present invention.

FIG. 2 is a diagram of a conventional hot-dip plating equipment with a sealing box.

[Explanation of symbols]

1 Steel strip (strip) 2 Hot-dip metal plating bath (zinc bath) 3 Sinking roll 4 Plating deposition amount adjustment device (gas wiping device) 5
Seal box 6 Vibration means

Claims (2)

[Claims] 1. In a hot-dip plating equipment for a steel strip, the steel strip is immersed in a hot-dip metal plating bath and then passed through a seal box having a plating coating amount adjusting device provided on the hot-dip metal plating bath, the seal box comprising: a vibration means for applying vibration to the outer wall of the seal box,
1. Hot-dip plating equipment characterized by being configured to prevent molten metal vapor or splash from adhering to the inner wall of a seal box. 2. When operating a hot-dip plating facility having a seal box with a vibrating means according to claim 1, the vibrating means applies 10 cycles/s to the seal box.
A method of operating a hot-dip plating facility characterized by applying vibrations of ec or higher.