JPS6036599Y2 - Steel strip shake prevention device in continuous hot-dip galvanizing equipment - Google Patents

Description

[Detailed description of the invention] The present invention is a continuous hot-dip plating apparatus equipped with a gas wiping device.
This invention relates to a vibration prevention device for copper strips that prevents bending, etc.

Generally speaking, in continuous hot-dip plating equipment where the plating thickness is controlled by spraying wiping gas from a gas wiping (gas throttling) device onto the copper strip that is rising out of the molten metal bath, the copper strip swings and curves at the gas wiping position. If this occurs, the width direction of the copper strip relative to the gas wiping nozzle and the distance between the front and back sides will be different, making it impossible to obtain a uniformly plated product.

However, in recent years, continuous hot-dip plating equipment has become faster, and the free path section from the molten metal bath to the top roll has become longer.
At the gas wiping nozzle position, the copper strip is becoming noticeably shaken and curved.

Therefore, when a continuous hot-dip plating apparatus is operated at high speed, how to prevent the copper strip from wobbling or bending is an important issue.

However, the plating metal at the gas wiping nozzle location is still in a molten state and generally cannot be contacted.

Therefore, in order to prevent the steel strip from wobbling or bending at the above-mentioned position, it must be done in a non-contact manner.

Fortunately, when a copper strip that is continuously conveyed, such as a copper strip in a continuous hot-dip plating device, shakes or curves, this copper strip can be prevented non-contact by magnetic means. A shake prevention device has already been developed and is in practical use.

Therefore, it would be advantageous if this device could be applied to a continuous hot-dip plating device as well.

However, when applying the above-mentioned copper strip vibration prevention device to continuous hot-dip plating equipment, it is difficult to use it under normal conditions for a long period of time unless special measures are taken in consideration of the special characteristics of continuous hot-dip plating equipment. It is.

That is, the gist of the above-mentioned device is to arrange magnetic force means close to at least one edge of the copper strip, and apply tension outward in the width direction to the steel strip in a non-contact manner through the magnetic force means. When applied to continuous hot-dip plating equipment, the magnetic force means must be placed near the gas wiping nozzle, so that it is always subject to splash metal adhesion by the wiping gas, resulting in the adhering metal coming into contact with the copper strip. As a result, it becomes unusable in a short period of time.

The present invention provides a copper strip vibration prevention device that solves this problem.

In the present invention, as a first step in preventing the splash metal from adhering, the magnetic force means is housed in a non-magnetic case, thereby preventing the splash metal from adhering to the magnetic force means.

However, in this case, although the splash metal is prevented from adhering to the magnetic force means, the splash metal ends up adhering to the case.

Therefore, in the present invention, as a second step, an air nozzle is arranged on the non-magnetic case to prevent the splash metal from flying and to blow off the adhered metal.

However, even if air nozzles are arranged for the non-magnetic case, since the non-magnetic case is heated by the heat of the wiping gas and the molten metal bath, the adhesion force of the splash metal to the case is large.

Therefore, in order to weaken the adhesion of the splash metal and make it more likely to be blown away by the air nozzle, it is a good idea to cool the case internally.

The present invention will be explained in detail below with reference to the drawings.

The attached drawing shows an embodiment of the copper strip vibration prevention device of the present invention installed in a continuous hot-dip plating device, and 1 is a gas wiping nozzle of a gas wiping device; A pair of nozzle holes are arranged opposite to each other on both sides of the copper strip passing position directly above the metal bath 2, and high-temperature, high-pressure wamping gas is sprayed onto the steel strip 3 that has just risen from the molten metal bath 2. , the plating thickness is controlled.

On both sides of the steel strip 3 in the width direction, a non-magnetic case 5 for accommodating the magnetic force means 4 is arranged close to the edge of the steel strip 3.

In the case of continuous hot-dip plating, it is preferable to use a permanent magnet as the magnetic force means 4 in terms of space, economy, and control.

Although this non-magnetic case 5 is a thin-walled tube with an internal cooling structure, it is connected and supported by a moving device (not shown) so that it can move in the width direction of the steel strip 3. If there is a change in the pass line, the magnetic force means 4 housed inside can always apply tension outward in the width direction to the steel strip 3 in a non-contact manner in accordance with the change.

Two air nozzles 7.7a each having a flat nozzle hole are attached to each non-magnetic case 5 on both sides of the steel strip 3 via support members 6, 6a.

The nozzle hole of one of the air nozzles 7 faces the lower part of the copper band side, where the splash metal of the non-magnetic case 5 is most likely to adhere, than the copper band side, and is oriented so as to blow away the splash metal adhering to the non-magnetic case 5. In addition, the nozzle holes of the other air nozzles 7a are oriented so that air forms an air curtain against the lower end of the non-magnetic case 5.

In the present invention configured as described above, air is constantly blown from the pot air nozzle 7.7a during plating work.

Then, most of the splashed metal that comes to the non-magnetic case 5 is first blown away diagonally downward by the air curtain from the air nozzle 7a, and the splashed metal that has passed through this air curtain and adhered to the non-magnetic case 5 is also blown away by the air curtain from the air nozzle 7a. Since it is cooled, its adhesion is weak,
It is easily blown away by the air nozzle 7 and is prevented from adhering to the case 5.

In addition, in the present invention, each air nozzle 7.7a is attached to the non-magnetic case 5 by the support members 6, 6a, so it moves together with the case 5, and its positional relationship can be adjusted by moving the case 5. There is no need to do this, and the operation is extremely easy.

However, in the case of the present invention, the non-magnetic case 5 and the air nozzle 7,
The air nozzle 7.7a does not necessarily have to be integrated with the plating machine, and the air nozzle 7.7a may be attached to a part of the plating machine.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention in which the copper strip vibration prevention device of the present invention is installed in a continuous hot-dip plating machine, and Fig. 1 is a cross-sectional view thereof, and Fig. 2 shows a part of the gas wiping nozzle omitted. FIG. 1... Gas wiping nozzle, 2...
Molten metal bath, 3... Copper strip, 4... Magnetic force means, 5... Non-magnetic case, 6, 6a...
... Support member, 7, 7a... Air nozzle.

Claims (2)

[Scope of utility model registration request] (1) In a continuous hot-dip plating apparatus equipped with a gas wiping device, a magnetic force means for applying tension outward in the width direction to the copper strip in a non-contact manner is housed in a non-magnetic case, and the gas wiping device is equipped with a gas wiping device. A continuous hot-dip plating apparatus characterized in that an air nozzle is arranged near the edge of the copper strip near the nozzle, and an air nozzle for preventing splash metal adhesion during gas wiping is arranged on the non-magnetic case. A device for preventing vibration of copper strips. (2) The copper strip in the continuous hot-dip plating apparatus according to claim 1 of the utility model registration claim, characterized in that the air nozzle is attached to a non-magnetic case and arranged so as to be movable as a unit. Anti-shake device.