JPH02305948A - Dross removing device for inside of snout for continuous hot dip metal coating - Google Patents

Abstract

PURPOSE:To allow the expulsion of dross to the outside of a snout during a plating operation by providing a mechanism for blowing the dross suspending in the snout toward the side walls of the snout and capturing and discharging this dross in the capturing part of troughs. CONSTITUTION:A pair of the dross capturing troughs 6 are provided on the outside wall of the snout 4 and inverted hollow-shaped space parts are opened to the strip 1 side of the troughs 6 at the time of continuously passing the strip 1 in the snout 4 immersed in a plating bath 2 to execute plating. An inert gas is injected from nozzles 15 provided in the snout 4 to integrate the suspended dross to the inverted hollow-shaped space parts of the troughs 6 when the dross deposits in the snout 4 constituted in such a manner. The troughs 6 are then sunk into a plating bath 2 by a trough lifting and shifting device 7 and thereafter, the troughs 6 are parted in a horizontal direction from the strip 1 surface to discharge the dross in the inverted hollow-shaped space parts together with the inert gas into the plating bath 2 on the outside of the about 4. The dross is expelled without interrupting the operation in this way. The product having high quality is thus stably obtd.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a dross removal device for continuous hot-dip metal plating equipment, and more specifically, to a device for effectively removing dross generated in a snout installed in a molten metal bath. The present invention relates to a device for removing dross that does not reduce productivity or quality of a plated surface.

<Prior art> Conventionally, as shown in FIG. 8, plating equipment widely used in continuous hot-dip metal plating lines is designed to prevent the strip 1 coming out of the reduction annealing furnace 5 from coming into contact with the atmosphere. Therefore, a cylindrical snout 4 is disposed between the reduction annealing furnace 5 and the plating bath 2. One end of the snout 4 is connected to the reduction annealing furnace 5 and the other end is immersed in the plating bath 2 in order to isolate the interior from the atmosphere.
The inside is filled with reducing gas.

However, this reducing gas contains a trace amount of oxygen or moisture, and this oxygen or moisture mixes with the molten metal on the surface of the plating bath 2 to form dross 3. When this dross 3 is deposited in the snout 4, it adheres to the strip 1 which is continuously moving in the direction of the arrow. If the dross 3 adheres to the surface of the strip 1 in this way, the quality of the plating surface of the strip 1 will be significantly impaired.Currently, this dross 3 is regularly removed from the surface of the plating bath 2 in the snout 4. .

Conventionally, to remove dross 3, the plating operation was stopped,
After replacing the reducing atmosphere in the snout 4 with an atmospheric atmosphere, the dross 3 can be removed through a manhole (not shown) provided in the snout 4, or by lowering the plating bath 2 or raising the snout 4. I was scraping it out.

<Problems to be Solved by the Invention> However, in order to remove the dross 3 from the snout 4, the plating work must be interrupted for a long time and frequently, which greatly reduces productivity. There was a problem with the decline. Also, while dross removal work is a batch work,
The generation of dross 3 is continuous, and the amount of dross 3 generated in the snout 4 increases in proportion to the plating work time after dross removal, so the amount of dross 3 attached to the strip 1 increases Since it is proportional to some extent, it is not possible to completely prevent the adhesion, and there is a problem that the quality of the product is unstable.

In addition, as a method for removing dross 3 in the snout 4 or preventing dross 3 from adhering to the strip l, Japanese Patent Application Laid-Open No. 51-56
Improvement measures have been proposed such as No. 738, No. 56-13472, No. 62-188766, No. 47-9915, No. 53-35920, No. 55-51351, No. 55-54358, etc., but they do not solve the above problems. The issue has not yet been resolved.

An object of the present invention is to provide a dross removal device that solves these problems.

Means for Solving the Problems> The present invention provides a continuous hot-dip metal plating apparatus that continuously applies plating to a strip by passing the strip through a snout whose one end is immersed in a plating bath made of molten metal. A pair of dross collection troughs each having a side wall parallel to the strip surface and an inverted concave space extending above the side wall and open on the strip side are installed on both sides of the strip in the snout, with the lower part of the side wall After being immersed and charged in a plating bath, the trough is submerged in the plating bath, then moved away from the strip surface, and then tilted in a plane parallel to the strip surface to discharge the collected dross out of the trough, A trough moving mechanism configured to return to the original position is connected to the trough, and a nozzle is configured to inject inert gas toward both the front and back surfaces of the strip to blow floating dross toward the side wall. It is provided within the snout.

<Operation> By spouting inert gas from the nozzle installed in the snout toward the front and back surfaces of the strip, the dross floating on the molten metal plating bath at the height of the snout is blown onto the trough, and then the trough is plated. Submerge in the bath. At this time, the dross and inert gas sink into the plating bath together with the trough, and the inert gas remains in the trough. Furthermore, by tilting the trough in the plating bath after moving the trough away from the strip surface, the dross can be discharged to the outside of the snout together with the inert gas filling the trough.

<Example> An example of the dross removal device inside a snout for continuous hot-dip metal plating of the present invention will be described based on the drawings.

FIG. 1 is a front view of the snout 4, and FIG. 2 is a side sectional view of the snout 4. In Fig. 1.2, a trough 6 arranged in the snout 4 for collecting and discharging dross is shown.
is supported by a trough lifting/shifting device 7 attached to the outer wall of the snout 4. The trough elevating/shifting device 7 has a trough elevating cylinder 9 mounted on a base 8, and is connected by an elevating rod 11 that connects the trough 6 and the elevating cylinder 9 through a force field 10 during elevating. . The base 8 is a crank mechanism 12 having a rotation center at the snout 4, and is attached to the snout 4.

The upper end of the base 8 is connected to an actuator I3 for shifting the trough 6, and the actuator 13 is configured to be rotatably supported on the snout 4 by a bracket 14.

In addition, a nozzle 15 for blowing dross 3 toward the trough 6 is arranged inside the snout 4, and by injecting inert gas from this nozzle 15 toward the snout, the gas circulating inside the snout 4 is By forcibly creating the flow A, the dross 3 floating on the surface of the plating bath in the snout 4 is accumulated in the trough 6.

Note that the trough 6 has a shape as shown in FIG.
It has a shape that allows easy discharge of dross within the plating bath 2.

Next, the operation of this device will be explained with reference to FIGS. 4 to 7.

Note that arrow B in the figure indicates the direction of movement of the trough 6.

FIG. 4 shows a state in which the floating dross 3 is being blown toward the trough 6 by the gas flow A jetted from the upper part.

FIG. 5 shows the state in which the trough 6 is immersed in the plating bath 2. At this time, the dross 3 and the inert gas in the trough 6 sink together with the trough 6, and an inert gas stagnation 16 is generated in the trough 6.

FIG. 6 shows the state in which the trough 6 has been moved horizontally away from one surface of the strip.

FIG. 7 shows that the trough 6 is tilted in the state shown in FIG.
This figure shows the state in which the liquid is discharged into the outer plating bath 2.

After completing the above series of operations, the reverse operation is performed to set a trough within the snout 4 again. By inserting and removing the trough 6 that collects and removes the dross 3 from the opening of the snout 4, the dross 3 on the surface of the plating bath 2 inside the snout 4 can be completely removed from the snout 4, and the plating work Above all, it is possible to remove dross continuously.

<Effects of the Invention> The dross removal device inside the snout of the continuous hot-dip metal plating apparatus of the present invention makes it possible to completely remove dross to the outside of the snout during plating work. This will improve productivity.

■ Defects on the plating surface of strips due to dross adhesion can be significantly suppressed, making it possible to manufacture stable high-quality products.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of the device of the present invention, FIG. 2 is a side sectional view, and FIG. 3 is a perspective view showing an embodiment of the trough of the present invention. 4 to 7 are explanatory views of the operation of the apparatus shown in FIG. 1, and FIG. 8 is an explanatory view of the state of dross accumulation in the conventional plating apparatus. 1... Strip, 2... Plating bath,
3... Dross, 4... Snout,
5... Reduction annealing furnace, 6... Dross collection/discharge trough, 7... Trough elevation/shift device, 8... Base, 9... Trough elevation cylinder, 10... Guide, 11 ...lifting rod,
12... Crank mechanism, I3... Shift actuator, 14... Bracket, 15... Nozzle, 16... Inert gas retention. Patent applicant: Kawasaki Steel Corporation T51 Figure 2

Claims (1)

[Claims] In continuous hot-dip metal plating equipment, in which the strip is continuously plated by passing the strip through a snout whose one end is immersed in a plating bath made of molten metal, an extension is formed between a side wall parallel to the surface of the strip and the top of this side wall. A pair of dross collecting troughs each having an inverted concave space with an opening on the strip side are installed in the snout on both the front and back sides of the strip by immersing the lower part of the side wall in a plating bath,
After the trough is submerged in the plating bath, then moved away from the strip surface, and then tilted in a plane parallel to the strip surface to discharge the collected dross out of the trough,
A trough moving mechanism configured to return to the original position is connected to the trough, and a nozzle is configured to inject inert gas toward both the front and back surfaces of the strip to blow floating dross toward the side wall. A dross removal device inside a snout for continuous hot-dip metal plating, characterized in that it is provided inside the snout.