JPH0711066B2 - Continuous annealing furnace with surface treatment equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a continuous annealing furnace having a surface treatment facility in which the progress of wear of a conductor roll of a plating tank is reduced.

[Conventional technology]

One of the methods of producing a surface-treated steel sheet with excellent corrosion resistance using an annealing furnace is to attach an element such as nickel to the steel sheet surface before the annealing treatment, and then form a diffusion layer of the element in the annealing process. Then, a method of performing an original surface treatment after annealing is known (Japanese Patent Publication No. 54-20940, Japanese Patent Laid-Open No. 57-2005).
See No. 92 rear).

When this method is carried out in a continuous annealing furnace, as shown in FIGS. 2 and 3, the plating equipment 2 is arranged in front of the inlet side of the annealing furnace 1. The plating equipment 2 comprises electrolytic cleaning units 3 and 4 for degreasing steel plates, a plating tank 5 for plating, a rinse tank 6 for neutralizing and cleaning the plating solution adhering to the steel plates, a dryer 7 for removing water from the steel plates, etc. The steel sheets are sent to the annealing furnace 1 via the plating equipment 2 in the above order.

By the way, in a continuous annealing furnace having such a plating facility 2, not only the above-mentioned surface-treating steel sheet having excellent corrosion resistance but also ordinary surface-treating steel sheet or the like is treated due to economic need. There are many. Therefore, the steel sheet that is plated before annealing and the steel sheet that is not subjected to annealing have different processes, so the pass line of the steel plate must be changed.However, this involves stopping the production line for a long time, so the process is different. However, it is desirable to use the same pass line.

Therefore, from this point of view, the same pass line is conventionally used,
The process switching between the plated steel plate and the non-plated steel plate was performed simply by turning on and off the current supplied to the conductor roll 8 (see FIGS. 2 and 3). Reference numeral 10 is a ringer roll that feeds the steel plate 9 into the plating tank 5, and 11 is an anode provided in the plating tank.

[Problems to be Solved by the Present Invention]

However, in such a conventional method, the conductor roll 8 is always in contact with the steel plate whether the steel plate passed through the plating tank 5 is for plating or for non-plating. Therefore, the wear of the surface will progress even when the non-plating steel sheet is threaded.

The abrasion of the surface of the conductor roll causes an arc between the surface and the steel plate due to the current flowing during plating, and this arc causes a so-called arc spot (perforation due to the arc) on the surface of the steel plate. It needs to be replaced frequently. This has a problem that the smaller the treatment rate of the steel sheet for plating, the higher the cost of the plating treatment. Further, in the prior art, since the non-plating steel sheet also passes through the plating tank, there is a problem that the amount of the plating solution carried out by the steel sheet outside the plating tank increases, and the amount of unnecessary plating solution used increases.

The present invention has been made by paying attention to such conventional problems, and an object thereof is to solve the above problems by providing a plating roll with a conductor roll that separates from and contacts a steel plate as needed. There is.

[Means for solving problems]

The present invention provides a continuous annealing furnace having a surface treatment facility in a plating tank of a surface treatment facility, which is provided with a movable conductor roll that is pressed against the steel plate during the plating treatment of the steel plate and is separated from the steel plate when the plating treatment is not performed. It is a thing.

In addition to the movable conductor roll, the present invention also provides
A continuous annealing furnace having a surface treatment facility provided with a means for forming a liquid pool in which a plating solution is stored between a movable conductor roll and a steel plate that are pressed against each other during the plating process. Further, the present invention is a continuous annealing furnace having a surface treatment facility provided with means for exchanging the plating solution and water or hot water in a straight tank in addition to the movable conductor roll and means for forming a liquid pool. is there.

[Action]

The movable conductor roll installed in the plating tank is pressed against the steel plate that passes through the plating tank during the plating process, but is separated from the steel plate when the plating process is not performed. do not do.

In addition, since the contact area between the movable conductor roll and the steel plate during the plating process is small, the current density passing through the contact surface may be large and an arc spot may occur, but the movable conductor roll pressed by means for forming a liquid pool By storing the plating solution between the steel plate,
The contact area is enlarged to reduce the current density and prevent the generation of arc spots.

Furthermore, when passing a steel plate that is not plated,
The plating tank is filled with water or hot water by a means of replacing the plating solution in the plating tank with water or hot water to prevent the plating solution from being taken out by the steel plate. Next, when the steel sheet to be plated is passed through the plate, water or hot water is separately transferred from the plating tank to the container by the exchanging means, and the separately stored plating solution is returned to the plating tank to cope with the plating process.

〔Example〕

The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment according to the present invention. The same parts as those in the conventional example are designated by the same reference numerals, and duplicate description will be omitted.
First, the structure will be described. A movable conductor roll 12 is provided near the exit side of the plating tank 5 at a position separated from the steel plate 9. Reference numeral 13 denotes a drive device such as a fluid pressure cylinder, which is a movable conductor roll during the plating process.
Is pressed against the steel plate 9.

Reference numeral 14 is a nozzle header, and 15 is a nozzle of the nozzle header, which is provided so as to face the contact position between the movable conductor roll 12 and the steel plate 9, and the steel plate 9 and the movable conductor roll 12 are pressed against each other during plating. A plating solution is injected from a nozzle 15 into a space to be stored and stored therein to form a liquid pool 16. The nozzle header 14 and the nozzle 15 constitute a means M for forming the liquid pool 16.

Reference numeral 17 denotes a plating solution storage tank, which can temporarily store the plating solution in the plating tank 5 or can return the stored plating solution to the plating tank 5 by a pump 18. 19 is a water or hot water storage tank, which is a plating tank 5
Store the plating solution and the water or hot water supplied instead. 20 is a pump for that purpose. By the plating solution storage tank 17, water or hot water storage tank 19, pumps 18, 20,
The replacement means N is configured.

Next, the operation will be described.

First, during plating, the movable conductor roll
12 is in a state of being pressed against the steel plate 9 by the fluid pressure cylinder 13, and at this time, the plating solution is injected from the nozzle 15 into the space formed by the steel plate 9 and the conductor roll 12, and the liquid pool 16
Is formed. At this time, the current supplied to the conductor roll 12 flows to the steel plate through the wide contact surface of the liquid pool 16 in addition to the extremely narrow contact surface (close to line contact) between the conductor roll 12 and the steel plate 9, The current density at this contact surface is reduced, and arcing is prevented.

Next, when a steel plate that has not been plated is passed through the plating tank 5, the fluid pressure cylinder 13 is driven in the opposite direction to separate the conductor roll 12 from the steel plate 9. Next, after the plating solution in the plating tank 5 is transferred to the plating solution storage tank 17, the water or hot water in the water or hot water storage tank 19 is added to the plating tank 5
Supply inside. Therefore, the steel plate 9 in the plating tank 5 will pass through the water, and the plating solution will not be carried out. Moreover, since the movable conductor roll 12 does not come into contact with the steel plate 9 when the steel plate 9 is not plated, wear does not occur in the conductor roll 12 during this time, and the life is extended accordingly.

〔The invention's effect〕

As described above, according to the present invention, the configuration, in the plating tank of the surface treatment equipment, means for exchanging the plating solution and water or hot water, pressure contact with the steel plate during the plating treatment of the steel plate, from the steel plate during non-treatment Since the continuous annealing furnace has a movable conductor roll which is separated from the movable conductor roll and which is provided with means for forming a liquid pool in which the plating liquid is stored between the movable conductor roll and the steel plate pressed against each other during the plating treatment It is possible to obtain the effects of preventing the generation of arc spots, remarkably extending the life of the conductor roll, and remarkably reducing the amount of plating solution used. The following table shows an example of the effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment according to the present invention, FIG. 2 is a general configuration diagram of a continuous annealing furnace having surface treatment equipment, and FIG. 3 is a schematic diagram of a plating tank in a conventional example. 1 ... Continuous annealing furnace, 2 ... Surface treatment equipment, 5 ... Plating tank, 9 ... Steel plate, 12 ... Movable conductor roll, 14 ...
Nozzle header (liquid pool forming means ... M), 15 ... Nozzle (liquid pool forming means ... M), 16 ... liquid pool, 17 ...
… Plating solution storage tank (replacement means… N), 19 ……
Water or hot water storage tank (replacement means ... N), 18,20
…… Pump (replacement means …… N)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirohiro Yamaguchi 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works

Claims (3)

[Claims] 1. A continuous annealing furnace having a surface treatment facility in front of the entrance side of the annealing furnace. When the steel plate is plated in a plating tank of the surface treatment facility, the steel plate is pressed against the steel plate, and when the plating process is not performed, the steel plate is removed. A continuous annealing furnace having a surface treatment facility, which is provided with movable conductor rolls separated from each other. 2. A continuous annealing furnace having a surface treatment facility in front of the entrance side of the annealing furnace, wherein the plating tank of the surface treatment facility presses the steel sheet during the plating treatment and separates from the steel sheet when the plating treatment is not performed. A continuous annealing furnace having a surface treatment facility, which is provided with a movable conductor roll for performing a plating treatment and a means for forming a liquid pool in which a plating liquid is stored between the movable conductor roll pressed against the steel plate during the plating treatment. 3. A continuous annealing furnace having a surface treatment facility in front of the inlet side of the annealing furnace, wherein a plating tank of the surface treatment facility is provided with:
When the steel sheet is plated, it is pressed into contact with the steel sheet, and when it is not plated, a movable conductor roll that separates from the steel sheet, and a pool of plating solution stored between the movable conductor roll and the steel sheet that are pressed into contact during the plating treatment A continuous annealing furnace having a surface treatment facility, which is provided with a means for forming and a means for exchanging a plating solution with water or hot water in the plating tank.