JPH1036953A - Device for removing excess plating liquid of hot dip metal coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the splashing of a plating liquid and to suppress the generation of the dross (metal oxide) suspended on the surface of the plating liquid by suppressing the generation of sounds by ejected air by a simple improvement in removing the excess plating liquid sticking to the lateral end faces of a metal plated sheet subjected to metal plating by the ejection of the air. SOLUTION: Edge plates 21, 21 are disposed approximately parallel with the hot dip metal coated sheet 2 on both sides of the hot dip metal coated sheet 2. Band materials 22 which are parted with a suitable spacing from the side end faces 2a of the hot dip metal coated sheet 2 and face the side end faces 2a are mounted at the edge plates 21. The bottom ends of the edge plate 21 are provided with guiding implements 23 for guiding the air flowing down along the edge plates 21 diagonally outward and downward parting from the front surface side of the edge plates 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing a surplus plating solution for hot-dip metal plating, and more particularly to a method for removing surplus plating solution adhering to a side end surface of a metal-plated metal plate by jetting air. In spite of this, a simple improvement has been made to suppress the sound generated by the jetted air, prevent the plating solution from scattering, and suppress the generation of dross (metal oxide) floating on the surface of the plating solution. It is related.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional apparatus for removing a surplus plating solution of molten metal plating which sucks and removes a surplus plating solution attached to a side end surface of a metal plating plate which is pulled upward through a plating bath. As shown in JP-A-7-173596, edge plates 21 and 21 are disposed substantially parallel to the hot-dip metal plate 2 on both sides in the width direction of the hot-dip metal plate 2, and the hot-dip metal plate is provided on the edge plate 21. A strip 22 is attached to the side end surface 2a of the plate 2 at appropriate intervals and is opposed to the side end surface 2a of the molten metal plating plate 2. In the figure, reference numeral 16 denotes an air wiping nozzle 16.

[0003]

However, in the conventional structure described above, the air wiping nozzle 1
Excessive plating solution adhering to the side end surface 2a of the hot-dip metal plating plate 2 is removed by the air blown out from the hot-dip metal plating plate 2. In this case, the edge plates disposed on both sides of the hot-dip metal plating plate 2 are removed. 21 and, thus,
The air that collides with the edge plate 21 is diverted vertically along the edge plate 21, and the air that flows downward collides violently with the liquid surface of the plating bath 1, causing the liquid surface to undulate and causing droplets to be scattered. In addition, they adhere to the surface of the plating and roughen the surface of the plating. Further, when the air continuously and violently collides with the liquid surface, the oxidation of the surface of the plating bath is promoted, so-called dross (metal oxide). ) Is generated, which floats on the liquid surface, and tends to cause poor plating.

[0004] The present invention has been made in view of such a problem, and an object of the present invention is to discharge excess plating solution adhering to a side end surface of a hot-dip metal-plated plate by hot air jet. Excessive plating solution of molten metal plating that can suppress sound generation due to jet air, prevent scattering of droplets, and suppress dross (metal oxide) generation by simple improvement. It is an object of the present invention to provide an apparatus for removing odors.

[0005]

According to the first aspect of the present invention, the side end surface 2 of the hot-dip metal plating plate 2 moving between the air wiping nozzles 16, 16 which oppose each other and ejects air.
a removing device for removing the excessive plating solution a attached to the hot-dip metal plating plate 2 on both sides of the hot-dip metal plating plate 2.
Edge plates 21 and 21 are arranged substantially in parallel with each other, and the edge plate 21 is appropriately spaced from the side end surface 2a of the hot-dip metal plated plate 2 and is a band material 2 facing the side end surface 2a.
2 is provided, and at the lower end of the edge plate 21 there is provided a flow-down guide 23 for guiding air flowing down along both surfaces of the edge plate 21 obliquely outward and downward from the surface of the edge plate 21. It is characterized by the following.

According to the second aspect of the present invention, the downflow guide member 23 is characterized in that it is bent at about 90 ° into an angle material. In the configuration of the first aspect, the edge plate 2 collides with the edge plate 21 and collides.
The air flowing down along 1 is guided obliquely outward and downward by the flow-down guide 23, so that it is possible to avoid the air from violently colliding with the liquid surface of the plating bath 1 and to make the plating solution rippling. Avoiding the scattering of liquid droplets, avoiding the roughening of the plating surface due to the scattering, and also avoiding the continuous collision of air with the liquid surface, the oxidation of the liquid surface is promoted, and dross is generated. By floating on the surface, it is possible to avoid roughening the plating surface.

In the structure of the second aspect, the air colliding with the edge plate 21 can be released at an angle of about 45 ° with respect to the vertical direction, and can be guided well by the downflow guide 23. The operation in the configuration of claim 1 is further ensured.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a main part of the present invention, and FIG. 2 shows a schematic front view of the apparatus. A long metal plate is immersed in the plating bath 1, guided by the sink roll 7, and subjected to metal plating, and the molten metal plating plate 2 is pulled upward through the plating bath 1 to finish the drying process and the like. To be wound on a take-up reel. In this case, the plating solution adheres to the molten metal plated plate 2 pulled up from the plating bath 1 not only at the center but also at the side edges. The plating solution adhering to the plate surface of the hot-dip metal plating plate 2 is provided on both sides of the hot-dip metal plating plate 2, and the pressure from the air nozzles 16, 16 arranged in a line with respect to the plate surface. The plating solution can be removed and flowed down to the plating bath 1 by a so-called air knife by blowing air. By the way, the surplus plating solution a adhering to the side end of the hot-dip metal plating plate 2 is also removed, and its configuration will be described in detail below.

Fixed rails 8 are provided on both sides of the moving path of the hot-dip metal plating plate 2. Moving substrate 10
Are provided with upper and lower guide rolls 9. The guide rolls 9 are engaged with the fixed rails 8 so that the movable base 10 can move in the direction along the plate surface of the hot-dip metal plated plate 2. The upper edge of the fixed rail 8 is formed in an inverted V-shape to prevent the accumulation of dust on the upper edge.

The moving base 10 is provided with a removing means 3 for removing the surplus plating solution a and a follower 4 for following the movement of the molten metal plating plate 2 from a predetermined movement locus. A wire 11 is attached to the moving base 10, and the wire 11 is wound around a roller 12, and a weight 13 is attached to an end.
Is engaged. Thus, the gravity of the weight 13 is applied to the moving base 10 via the wire 11, and the moving base 1
0 is urged toward the molten metal plating plate 2 side, and the V-shaped roller 4a of the follower 4 contacts the side end surface 2a of the molten metal plating plate 2,
In this way, the V-shaped rollers 4a, 4a come into contact from both sides of the molten metal plating plate 2 so that the removing means 3, 3 can follow the movement of the molten metal plating plate 2 in the direction along the plate surface. is there.

[0011] The molten metal plated plate 2 can follow the fluctuation in the plate thickness direction with the following configuration. That is, the shaft 6 is provided on the back side of the moving base 10 via the stay, and the shaft center of the shaft 6 is provided on the molten metal plating plate 2.
The swing bar 5 is suspended from the shaft 6 so as to be swingable. As described above, the configuration for holding the shaft 6 on the movable base 10 can be variously changed in design. The removing means 3 is attached to the lower end of the swing bar 5, and a V-shaped roller 4a of the follower 4 is attached slightly above the removing means 3.

The oscillating bar 5 pivots about the shaft 6 to oscillate in the thickness direction of the hot-dip metal plating plate 2, and the removing means 3 and the V-shaped roller attached to the oscillating bar 5. 4a sufficiently follows the movement of the hot-dip metal plated plate 2 in the thickness direction. In such a case, the removing means 3 and the V-shaped roller 4
a is in close proximity and further enhances the followability.

The V-shaped roller 4a of the follower 4 has a structure shown in FIG.
As shown in (c), a pair of guide plates 4b, 4b are provided so that the end of the hot-dip metal plated plate 2 can be easily guided. Also, air is blown from the air path to the V-shaped roller 4a,
a is to be cooled. In FIG. 2, arrow A indicates air supply.

As shown in FIG. 1, the removing means 3 has an edge plate 21 which is held substantially parallel to the hot-dip metal plating plate 2, and the edge plate 21 is provided on the side end surface 2 a of the hot-dip metal plating plate 2. At a suitable interval, a band member 22 facing the side end surface 2a is attached. Strip 22
Is bent in an arc shape. At the lower end of the edge plate 21, there is provided a flow-down guide 23 for guiding the air flowing down along the edge plate 21 downward and obliquely away from the surface of the edge plate 21. In this case, the flow-down guide 23 has a steel plate bent at about 90 ° and is welded to the edge plate 21. The flow-down guide 23 may use an angle material. Further, a concave arc surface may be formed on the surface inclined at about 45 ° of the flow-down guide member 23 so that the air is moved further away from the edge plate 21 so that the air collides with the liquid surface at a gentler angle. . Further, the inclination angle of the downflow guide member 23 can be changed.

The air that collides with the edge plate 21 and flows down along the edge plate 21 is guided obliquely outward and downward by the downflow guide 23, and the air violently collides with the liquid surface of the plating bath 1. In order to prevent the sound from being generated due to the collision of air.
This avoids collision of liquid droplets of the surplus plating solution removed together with the air with the liquid surface of the plating bath 1 and also prevents the liquid surface from being ruffled. This is to avoid roughening of the plated surface. Further, it is possible to prevent the air from continuing to violently collide with the liquid surface, thereby promoting oxidation of the plating surface and generating dross, which is prevented from floating on the liquid surface, thereby avoiding roughening of the plating surface. In this case, the air that has collided with the edge plate 21 is released at an angle of approximately 45 ° with respect to the vertical direction by the downflow guide device 23.
It guides well and further ensures the above-described action.

The following measurement results were obtained by using the excess plating solution removing apparatus 3 of the present invention. A metal plate of 0.50 mm (thickness) x 755 mm (width) has a basis weight specification of Z12, an air ejection pressure from an air wiping nozzle of 0.93 kg / cm ² , and a line speed of feeding the metal plate at 135 m / min. When the hot-dip galvanizing was performed, the acoustic measurement at a location about 6 m away from the sound source was 95 to 97 db.

[0017] 0.60mm (thickness) x 756mm
The (weight) metal plate had a basis weight specification of Z08, an air ejection pressure from an air wiping nozzle of 1.40 kg / cm ² , and the other conditions were the same. In this case, the value was 120 db when the removing device 3 was removed. A metal plate of 0.60 mm (thickness) × 610 mm (width) was set to 100 db when the other conditions were the same. In this case, when removing device 3 is removed, 120 to 125
db.

From the above measurement results, it can be seen that the edge plate is effective in removing excess plating solution from the narrow-width hot-dip metal plated plate 2 and also against the noise. By the way, the chromium plating is applied to the band material 22 so that the plating solution hardly adheres thereto, and the adhered material is easily removed. Further, the air ejection direction of the air wiping nozzle 16 was made substantially horizontal, and the position was made higher than in the past, so as to avoid the air from violently colliding with the liquid surface. Further, the mounting position of the removing device was set to be about 5 mm higher than that of the conventional one, and the interval between the hot-dip metal plating plate 2 and the strip 22 was widened to about 4 to 5 mm.

[0019]

According to the first aspect of the present invention, there is provided a removing apparatus for removing excess plating solution adhering to a side end surface of a molten metal plating plate moving between air wiping nozzles which jet air in opposition. Edge plates are arranged on both sides of the metal plating plate substantially in parallel with the molten metal plating plate,
At the edge plate, strips are attached to the side end surfaces of the hot-dip metal plate at appropriate intervals and opposed to the side end surfaces.At the lower end of the edge plate, air flowing along both surfaces of the edge plate is supplied to both sides of the edge plate. Since there is provided a flow-down guide that guides diagonally outward and downward away from the surface, the air that collides with the edge plate and flows down along the edge plate is guided diagonally outward and downward by the flow-down guide, It is possible to avoid the air from violently colliding with the liquid surface of the plating bath, avoiding the ripple of the plating liquid surface, and avoiding the scattering of droplets, and the roughening of the plating surface due to the scattering. Further, avoiding the vigorous collision of air with the liquid surface, the oxidation of the plating surface is promoted and dross is generated, which floats on the liquid surface, and There is the advantage that it is this to avoid the roughening the surface.

According to the second aspect of the present invention, since the downflow guide is bent at about 90 ° in the form of an angle material, the air colliding with the edge plate is formed at an angle of about 45 ° with respect to the vertical direction. It can be escaped and can be satisfactorily guided by the downflow guide, and the effect of the first aspect of the present invention can be further ensured.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 2 is an overall schematic front view.

3A is a schematic front view, FIG. 3B is a schematic sectional view showing an air wiping nozzle, FIG. 3C is a schematic sectional view showing a V-shaped roller, and FIG. 3D is a surplus plating solution for a molten metal plating plate. (E) is a side cross-sectional view showing an operation before removing is performed.

FIG. 4 is a schematic horizontal sectional view showing a conventional example.

[Explanation of symbols]

 2 Hot-dip metal plating plate 16 Air wiping nozzle 21 Edge plate 22 Strip 23 Downflow guide

Claims (2)

[Claims] 1. A removing device for removing excess plating solution adhering to a side end surface of a molten metal plating plate moving between air wiping nozzles which blow air in opposition to each other, wherein both sides in a width direction of the molten metal plating plate are removed. An edge plate is disposed substantially in parallel with the hot-dip metal plating plate, and a strip is attached to the edge plate at an appropriate distance from a side end surface of the hot-dip metal plating plate and is opposed to a side end surface of the hot-dip metal plating plate.
Molten metal plating, characterized in that a flow-down guide is provided at the lower end of the edge plate to guide air flowing down along both surfaces of the edge plate diagonally outward and downward from both surfaces of the edge plate. For removing excess plating solution. 2. The downflow guide device has a shape of an angle material of about 90 degrees.
2. The apparatus according to claim 1, wherein the apparatus is bent at an angle.