JPS6036598Y2 - Steel strip shake prevention device in continuous hot-dip galvanizing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copper strip deflection prevention device for preventing deflection, bending, etc. of a copper strip at the gas wiping position of a continuous hot-dip plating apparatus equipped with a gas wiping device.

A continuous method in which the copper strip is continuously heated and reduced in a pretreatment zone, then introduced into a molten metal bath, and then a wiping gas is sprayed from a gas wiping device at the portion rising above the bath to control the plating thickness. In hot-dip plating equipment, the plating thickness of the copper strip is significantly affected by the distance between the gas wiping nozzle that sprays wiping gas and the copper strip, and generally, when the copper strip is shaken or curved, the thickness of the copper strip will change in the width direction and The plating thickness on the front and back sides becomes non-uniform, and variations occur in the plating thickness.

On the other hand, in recent years, continuous hot-dip plating equipment has become faster and faster, and as a result, the free path section of the copper strip from the molten metal bath to the top roll has become significantly longer.

For this reason, at the gas wiping position where the plating thickness is controlled, the copper strip is noticeably shaken, curved, etc., making it difficult to control the uniform plating thickness, which is a characteristic of gas wiping equipment.

Incidentally, in recent years, a copper strip deflection prevention device that non-contactly prevents deflection, curvature, etc. of the copper strip in such a free pass section has been developed and put into practical use.

In this device, a magnetic means such as a permanent magnet or an electromagnet is arranged close to at least one edge of the copper strip, and the means applies tension outward in the width direction to the copper strip in a non-contact manner. It is something.

However, when applying such a device to a continuous hot-dip plating device, the magnetic force means is placed at the gas wiping position, specifically, between a pair of gas wiping nozzles arranged oppositely on both sides of the copper strip. It is most effective to place it close to the edge of the

However, such an arrangement is extremely difficult due to the size and arrangement of the gas wiping nozzle.

This uses a gas wiping nozzle that is longer than the maximum width of the copper strip that can be threaded in order to accommodate various steel strip widths and pass line variations, and when a magnetic means is placed between the gas wiping nozzles, This becomes an obstacle,
This is because when reducing the plating thickness, it may become impossible to bring the gas wiping nozzle close to the copper strip.

For this reason, conventional magnetic force means have been placed only above the gas wiping nozzle, where maintenance is easy, in order to prevent the copper strip from wobbling, but there is still a problem in that the copper strip suffers from slight wobbling or bending. .

In order to solve this problem, the present invention arranges magnetic force means not only above the gas wiping nozzle but also below it (on the molten metal bath side), and applying tension to the copper strip at the bottom of the gas wiping nozzle as well. I made it possible to grant it.

However, if the magnetic force means is placed below the gas wiping nozzle, the magnetic force means will be exposed to a high temperature atmosphere, and if the magnetic force means is a permanent magnet, its magnetic force will be reduced.

In addition, splash metal adheres and comes into contact with the copper strip, causing damage to the plating layer in an unsolidified state.

In addition, it is usually necessary to attach a moving device to the magnetic force means so that it can follow fluctuations in the width of the copper strip and the pass line, but in this case, providing a separate moving device for the lower magnetic force means would complicate the structure. I don't like it.

For these reasons, it is preferable that each magnetic force means be housed in a single case that bypasses the gas wiping nozzle, and that the case has a cooling structure.

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

1 to 3 show the state in which the device for preventing runout of a copper strip according to the present invention is installed in a continuous hot-dip plating device, and 11 is a gas wiping nozzle of a gas wiping device, which is usually directly above the molten metal bath 12. They are arranged in pairs facing each other.

The steel strip 13 passes through the presser roll 14 plated with the molten metal bath 12, and then passes between the gas wiping nozzles 11. During the passage, the steel strip 13 is blown by the wiping gas sprayed from the gas wiping nozzles 11. The plating thickness is controlled.

Cases 15 that bypass the gas wiping nozzle 11 are arranged close to the edge of the steel strip 13 on both sides of the copper strip in the width direction near where the gas wiping nozzle 11 is arranged.

This case 15 is a thin double-walled tube made of non-magnetic material, and its lower end is located above the molten metal bath 12, and the upper and lower parts of the gas wiping nozzle 11 are parallel to the edge of the steel strip 13. It has become.

This case 15 is provided with a cooling medium inlet 16 and an outlet 17, so that the inside thereof can be cooled, and an arm 18 is fixed to a part of the case 15, and a moving device (not shown) is installed in the case 15. ) so that it can move in the width direction of the steel strip 13.

In the case 15, permanent magnets 19 and 19a are housed in the upper and lower parts of the gas wiping nozzle 11, which are parallel to the edge of the steel strip 13, and are directed outward in the width direction with respect to the steel strip 13. tension can be applied non-contact.

Both of these permanent magnets 19 and 19a are attached to a support member 20 within the case 15 and are fixed within the case 15.

Now, in the above device, the permanent magnets 19.19a are arranged above and below the gas wiping nozzle 11, so when the steel strip 13 passes through the gas wiping nozzle 11,
Since tension is applied outward in the width direction at the top and bottom of the copper band 13, deflection, curvature, etc. of the copper band 13 are further reduced compared to the conventional case in which the copper band 13 is disposed only on the upper side.

In addition, the lower permanent magnet 19a is placed in a part that is easily affected by the heat of the high-temperature wiping gas, the molten metal bath 12, and splashed metal.
Since it is contained within, it is not affected by them.

Further, since the upper and lower permanent magnets 19.19a are housed in a single case, the distance between them and the edge of the copper strip 13 can be adjusted at the same time.

In the above embodiment, the lower permanent magnet 19a is placed between the gas wiping nozzle 11 and the molten metal bath 12, but in the case of the present invention, the lower side of the case 15 is placed in the molten metal bath 12. The permanent magnet 19a may apply tension to the steel strip 13 within the molten metal bath 12.

In this case, the conventional steel strip 13 is immersed in a molten metal bath 12.
The presser roll 14 can be omitted because it has the same function as the presser roll 14 which prevents the runout.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a continuous hot-dip plating apparatus in which the copper strip vibration prevention device of the present invention is installed, and FIG. 2 is a front view thereof. Further, FIG. 3 is a side view showing how the permanent magnet is installed. 11... Gas wiping nozzle, 12...
... Molten metal bath, 13... Steel strip, 14...
... Presser roll, 15 ... Case, 16 ...
... Cooling medium inlet, 17 ... Cooling medium outlet, 18 ... Arm, 19, 19a ... Permanent magnet, 20 ... Support member .

Claims (3)

[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 close to the edge of the copper strip,
A device for preventing vibration of a copper strip in a continuous hot-dip plating device, characterized in that the device is disposed above and below a wiping nozzle of the gas wiping device. (2) Registration of a utility model characterized in that the magnetic force means is a permanent magnet, and the permanent magnets arranged on both the upper and lower sides of the gas wiping nozzle are housed in a single non-magnetic case with a cooling structure. A device for preventing vibration of a copper strip in a continuous hot-dip plating apparatus according to claim 1. (3) The sequence according to claim 1 of the utility model registration, characterized in that the magnetic force means arranged above and below are both connected to a common moving device and are moved integrally in the width direction of the copper strip. A device to prevent vibration of copper strips in hot-dip plating equipment.