JP2559375Y2 - Continuous hot-dip plating 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 continuous hot-dip galvanizing apparatus for plating a running steel strip with a corrosion-resistant metal such as zinc, tin, lead-tin or aluminum or an alloy thereof.

[0002]

2. Description of the Related Art A continuous hot-dip galvanizing apparatus includes a pre-oxidation furnace for activating the surface of a running steel strip, a reduction annealing furnace for reducing and softening in a reducing gas atmosphere, and a cooling apparatus which is maintained in a reducing atmosphere and cooled. It consists of a duct-shaped snout and a hot-dip metal bath. The advantage of this continuous hot-dip galvanizing machine is that by changing the running speed of the steel strip, from thin plating to thick plating, various types of plated steel sheets with different basis weights can be manufactured more stably and easily than the brazing method. Is widely used.

However, for example, Japanese Patent Application Laid-Open No. 63-473
No. 55 and Japanese Unexamined Patent Publication (Kokai) No. 63-118057 disclose a continuous hot-dip plating apparatus in which foreign substances in an annealing furnace carried by a steel strip and dross generated in a hot-dip plating bath are hot-dipped in a snout. Floating on a metal bath,
There is a problem that the plating adheres to the strip and significantly impairs the plating appearance. In addition, the steam generated from the hot-dip metal bath surface in the snout adheres to and accumulates on the inner wall of the snout or the annealing furnace, and falls on the steel strip or hot-dip metal bath surface, causing the appearance flaws referred to as nicks and non-plating. There were also problems that occurred.

[0004] From these problems, Japanese Patent Publication No. 63-4974
As disclosed in Japanese Patent Publication No. 3 (1993), a continuous hot-dip plating apparatus using a foreign matter removing technique has been developed. This plating apparatus is a "technology for creating a gap between the tip of the snout and the hot-dip metal bath while supplying an inert gas into the snout and removing foreign matter from the gap". The present invention provides a snout apparatus which is connected to the outlet side of a furnace and moves up and down a snout whose tip is immersed in a hot-dip metal bath, and which can easily remove foreign substances. Such an apparatus is, as compared with the continuous hot-dip plating apparatus that has been used frequently as described above,
There is a reason that foreign substances floating on the hot-dip metal bath in the snout can be easily removed.

[0005] However, when it becomes necessary to remove foreign matter in the snout, the plating operation is temporarily interrupted and the snout is moved upward, thereby creating a gap between the tip of the snout and the hot-dip metal bath. Since this is a method of taking out foreign matter in the snout from the gap, there is a problem that the operation must be stopped when a large amount of foreign matter is generated despite the plating operation under the same conditions. In addition, since snout is always used by immersing it in a hot-dip plating metal bath, there is also a problem of melting out.

[0006]

SUMMARY OF THE INVENTION According to the present invention, foreign substances floating on a hot-dipped metal bath surface can be easily removed without interrupting the plating operation and without melting the snout. A continuous hot-dip plating apparatus is provided. The point is that a snout provided with an atmosphere gas introduction pipe is connected to the steel strip exit side of the annealing furnace with a gap provided from the hot-dip metal bath surface, and penetrates into the hot-dip metal bath through the snout. This is a continuous hot-dip plating apparatus in which a weir for preventing foreign matters floating in a hot-dip metal bath from being mixed is floated near a steel strip.

Hereinafter, the present invention will be described in detail. The figure shows one embodiment of the present invention. Reference numeral 1 denotes an annealing furnace, a part of which is shown. 2 is a steel strip. Reference numeral 3 denotes a turn-down roll, which is a furnace roll provided near the outlet of the annealing furnace 1. That is, the steel strip 2 is provided so as to travel around the turndown roll 3 while being softened in the annealing furnace 1 and travel. Reference numeral 4 denotes a snout, which is connected to the steel strip exit side of the annealing furnace 1. The snout 4 is a duct-shaped pipe provided with an atmosphere gas introduction pipe 5 for supplying an inert gas such as nitrogen or argon gas or other gas. They are connected with a gap.

That is, the snout 4 is provided so as to guide the steel strip 2 having traveled through the annealing furnace 1 into the bath of the hot-dip metal 7 while protecting the steel strip 2 with the atmospheric gas. 8
Is a sink roll, which rolls the steel strip 2 passing through the hot-dip metal bath. Reference numeral 9 denotes a weir for preventing foreign matters floating in the hot-dip metal bath. The foreign matter mixing prevention weir 9 is manufactured in a frame structure that is suspended so as to surround the vicinity of the steel strip 2 that enters the bath of the hot-dip metal 7 through the snout 4. Reference numeral 10 denotes a wiping gas nozzle for wiping the molten hot-dip metal deposited on the steel strip 2 ascending through the bath of the hot-dip metal 7 by a predetermined weight.

According to the continuous hot-dip galvanizing apparatus of the present invention as described above, the traveling steel strip 2 is softened in the annealing furnace 1 and then filled with an arbitrary atmospheric gas and passes through the snout 4 jetted from the lower part. Through the hot-dip metal bath 6
Wiping is performed to a predetermined basis weight to produce a plated steel sheet. During the plating operation, foreign matter generated and floating near the steel strip 2 entering the bath of the hot-dip metal 7 from the snout 4 and foreign matter floating beyond the foreign matter mixing prevention weir 9 should move the snout 4 upward. Further, the plating operation can be easily taken out from the gap between the snout 4 and the hot-dip metal bath without interrupting the plating operation, so that there is a feature that a hot-dip coated steel sheet with a beautiful appearance is continuously produced.

[0010]

[Effects of the Invention] As described above, according to the present invention, it is possible to easily remove foreign matters floating on the hot-dip metal bath surface without interrupting the plating operation and without melting the snout. A beautiful hot-dip coated steel sheet can be manufactured continuously.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Annealing furnace 2 Steel strip 3 Turndown roll 4 Snout 5 Atmospheric gas introduction pipe 6 Hot-dip plating metal tank 7 Hot-dip plating metal 8 Sink roll 9 Foreign matter prevention weir 10 Wiping gas nozzle

Claims (1)

(57) [Scope of request for utility model registration] 1. A snout provided with an atmosphere gas introduction pipe is connected to a steel strip outlet side of an annealing furnace with a gap provided from a surface of a hot-dip metal bath and penetrates into the hot-dip metal bath through the snout. Near the steel strip to be
A continuous hot-dip galvanizing apparatus characterized in that a weir for preventing the intrusion of foreign matters floating in a hot-dip metal bath is provided.