JP2014065954A - Baffle plate and method of manufacturing plated metal strip using the same - Google Patents

Abstract

The present invention relates to a baffle plate and a plated metal strip that can prevent the molten metal scattered in the vicinity of the wiping nozzle from adhering to the metal strip and suppress the scattered molten metal on the bath surface of the molten metal plating bath. An object of the present invention is to provide a manufacturing method.
A gas flow 4a descending between a side end 500 and an inclined surface 510 along the plate body 50 after being ejected from each wiping nozzle and colliding with the plate body 50, and ejected from each wiping nozzle 4. Then, after colliding with the plate body 50, the gas flow 4a directed obliquely downward along the inclined surface 510 is caused to collide with each other.
[Selection] Figure 1

Description

  The present invention is arranged between a pair of wiping nozzles arranged opposite to each other on the side of the metal strip pulled up from the molten metal plating bath, so that the gas flow injected from each wiping nozzle is on the side of the metal strip. The present invention relates to a baffle plate for avoiding collision with each other and a method for producing a plated metal strip using the baffle plate.

  As this kind of baffle plate used conventionally, the structure shown by the following patent document 1 can be mentioned, for example. That is, the conventional baffle plate includes a flat plate main body and a guide member. The upper surface of the guide member constitutes an inclined surface that falls as it approaches the metal strip. The lower end of the inclined surface is disposed at the same position as the side end of the plate body in the width direction of the plate body.

JP 2003-321756 A

In the conventional configuration as described above, the lower end of the inclined surface with respect to the width direction of the plate main body is disposed at the same position as the side end of the plate main body, so that the gas flow that collides with the plate main body after being ejected from the wiping nozzle is generated. All go to the metal strip side along the inclined surface. For this reason, the minute molten metal scattered in the vicinity of the wiping nozzle is easily attached to the metal strip again on the gas flow. When the scattered molten metal adheres to the metal strip, the appearance of the product deteriorates.
In addition, in order to prevent the molten metal from reattaching to the metal strip, it is possible to simply omit the inclined surface so that the gas flow does not go to the metal strip, but if the inclined surface is omitted, the plate body All the gas flow that collided with the liquid falls along the vertical direction. In this case, the molten metal is likely to be scattered on the bath surface of the molten metal plating bath, and if the molten metal scattered on the bath surface adheres to the peripheral device, it may cause a failure of the peripheral device.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to prevent the molten metal scattered in the vicinity of the wiping nozzle from adhering to the metal band, and to provide a molten metal plating bath. The present invention provides a baffle plate and a method for producing a plated metal strip that can suppress the scattering of molten metal on the bath surface.

  The baffle plate according to the present invention is disposed between a pair of wiping nozzles disposed on opposite sides of the metal strip pulled up from the molten metal plating bath, so that a gas flow ejected from each wiping nozzle is flown. A baffle plate for avoiding collision with each other on the side of the metal strip, the plate body being provided at a position away from the side end of the plate body in the width direction of the plate body and the plate body. And an inclined surface projecting along the plate thickness direction of the plate body from the lower end surface of the plate, after being ejected from each wiping nozzle and colliding with the plate body, between the side end portion and the inclined surface along the plate body. The gas flow that descends and the gas flow that is jetted from each wiping nozzle and collides with the plate main body and then goes diagonally downward along the inclined surface. It is configured to collide.

  The method for producing a plated metal strip according to the present invention includes a flat plate main body and a plate body that is provided at a position away from the side end of the plate main body in the width direction of the plate main body. A method of manufacturing a plated metal strip using a baffle plate having an inclined surface protruding along a plate thickness direction, a pair of metal plates pulled from a molten metal plating bath and disposed opposite to each other A baffle plate is arranged between the wiping nozzles of the gas, and a gas flow that is sprayed from each wiping nozzle and collides with the plate main body and descends between the side end and the inclined surface along the plate main body, and sprayed from each wiping nozzle Then, after colliding with the plate main body, the gas flows directed obliquely downward along the inclined surface collide with each other.

  According to the baffle plate of the present invention and the method of manufacturing a plated metal strip using the same, the gas that is sprayed from each wiping nozzle and collides with the plate body and descends between the side end and the inclined surface along the plate body. Since the gas flow and the gas flow that is jetted from each wiping nozzle and collides with the plate body and then obliquely downward along the inclined surface collide with each other, the molten metal scattered near the wiping nozzle adheres to the metal strip. Can be avoided, and scattering of the molten metal on the bath surface of the molten metal plating bath can be suppressed.

It is explanatory drawing which shows the plating metal strip manufacturing equipment to which the baffle plate by Embodiment 1 of this invention is applied. FIG. 2 is a perspective view specifically showing the periphery of the wiping nozzle of FIG. 1. It is a perspective view which expands and shows the baffle plate of FIG. It is explanatory drawing which shows the flow of the gas flow which collides with the baffle plate of FIG. It is explanatory drawing which shows the relationship of the dimension of each part of the baffle plate of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is an explanatory view showing a plated metal strip manufacturing facility to which a baffle plate according to Embodiment 1 of the present invention is applied. In the figure, when the plated metal strip is manufactured, the metal strip 2 introduced into the molten metal plating bath 1 is pulled upward in the vertical direction via the sink roll 3. Above the molten metal plating bath 1, a pair of wiping nozzles 4 are provided so as to sandwich the metal band 2, and a gas flow 4 a is sprayed from the wiping nozzles 4 onto the surface of the metal band 2. The adhesion amount of the molten metal on the surface of the metal band 2 is adjusted.

  Next, FIG. 2 is a perspective view specifically showing the periphery of the wiping nozzle 4 of FIG. 1, and FIG. 3 is an enlarged perspective view of the baffle plate 5 of FIG. As shown in FIG. 2, a baffle plate 5 is disposed on the side of the metal strip 2 and between the wiping nozzles 4. The baffle plates 5 are respectively disposed on both sides of the metal strip 2 in the width direction. By arranging the baffle plate 5 in this way, it is possible to avoid the gas flows 4 a ejected from the respective wiping nozzles 4 from colliding with each other on the side of the metal strip 2.

  As shown in FIGS. 2 and 3, the baffle plate 5 includes a plate body 50 and a guide member 51. The plate body 50 is a plate body that is formed in a flat plate shape as a whole, and has a shape in which a lower portion thereof is partially cut off on the metal band 2 side along the width direction 50a. Specifically, the side end portion 500 on the metal band 2 side along the width direction 50a of the plate body 50 is formed in a straight line shape along the vertical direction. The lower side 501 of the plate body 50 is formed in a straight line along the horizontal direction. The lower end of the side end portion 500 and one end of the lower side 501 are connected by an inclined piece 502 that is inclined so as to be separated from the metal strip 2 along the width direction 50a as it goes downward. That is, a region of a substantially triangular shape in front view surrounded by a line extending the side end portion 500 along the vertical direction, a line extending the lower side 501 along the horizontal direction, and the inclined piece 502 is cut out. The notches in the plate body 50 will be described in detail later.

  The guide member 51 is a member attached to the lower part of the plate body 50 on both the front and back sides of the plate body 50. At one end of the guide member 51 along the width direction 50 a, an inclined surface 510 is formed that protrudes from the lower end surface of the plate body 50 along the plate thickness direction 50 b of the plate body 50. The inclined surface 510 is a surface that is inclined so as to approach the metal strip 2 along the width direction 50a as it goes downward. That is, the lower end of the inclined surface 510 is the portion of the inclined surface 510 that is closest to the metal band 2. The lower end of the inclined surface 510 is provided at a position away from the side end portion 500 in the width direction 50a.

  Next, FIG. 4 is an explanatory view showing the flow of the gas flow 4a colliding with the baffle plate 5 of FIG. The gas flow 4 a ejected from each wiping nozzle 4 falls along the plate body 50 after colliding with the plate body 50. At this time, a part of the gas flow 4 a falls between the side end portion 500 and the inclined surface 510, and a part of the gas flow 4 a goes obliquely downward along the inclined surface 510. Therefore, these two gas flows 4a collide with each other below the baffle plate 5. Thereby, both the flow of the gas flow 4a downward in the vertical direction and the flow of the gas flow 4a to the metal band 2 are both weakened, and the molten metal scattered in the vicinity of the wiping nozzle 4 is prevented from moving toward the metal band 2. Thus, it is possible to prevent the molten metal from scattering on the bath surface of the molten metal plating bath 1 while avoiding the molten metal scattered in the vicinity of the wiping nozzle 4 from adhering to the metal strip 2.

Next, FIG. 5 is an explanatory view showing the relationship of the dimensions of each part of the baffle plate 5 of FIG. 3. FIG. 5 (a) shows the dimensions of each part of the baffle plate 5 in a front view, and FIG. ) Shows the dimensions of each part of the baffle plate 5 in the left side view. As shown in the figure
The extending width of the inclined surface 510 along the width direction 50a of the plate body 50 is A,
The extending width of the inclined surface 510 along the plate thickness direction 50b of the plate body 50 is B,
The rising angle of the inclined surface 510 with respect to the horizontal is α,
The distance that the inclined surface 510 is separated from the side end portion 500 in the width direction 50a of the plate body 50 is C,
The distance from the height position 40 of the wiping nozzle 4 to the lower end of the inclined surface 510 is D,
Let E be the distance from the height position 40 of the wiping nozzle 4 to the upper end of the inclined surface 510.

At this time, when the injection pressure of the gas flow 4a injected from each wiping nozzle 4 is in the range of 10 kPa or more and 80 kPa or less, A to E and α are set so as to satisfy the following expressions.

  The left side of the above formula shows the effective area of the inclined surface 510 with respect to the gas flow 4a descending along the vertical direction, and approximates the strength of the gas flow 4a that goes obliquely downward along the inclined surface 510. is there.

  Of the right side of the above formula, (D + E) / 2 is the distance D from the height position 40 of the wiping nozzle 4 to the lower end of the inclined surface 510 and from the height position 40 of the wiping nozzle 4 to the upper end of the inclined surface 510. The average height between the distance E is shown. Then, by multiplying (D + E) / 2 by C and (1/24), the strength at the average height of the gas flow 4a descending between the side end portion 500 and the inclined surface 510 is approximated. Yes. In addition, (1/24) is an adjustment coefficient when the injection pressure is in the range of 10 kPa or more and 80 kPa or less, and is derived by repeating the experiment.

  And by making the size of the left side more than the size of the right side as in the above formula, the flow of the gas flow 4a directed downward in the vertical direction can be sufficiently weakened, and the bath surface of the molten metal plating bath 1 Thus, it is possible to more reliably avoid the molten metal from being scattered.

  Further, as shown in FIG. 5, when the distance from the height position 40 of the wiping nozzle 4 to the upper end of the inclined piece 502 is F, and the inclination angle of the inclined piece 502 with respect to the vertical direction is β, F ≦ 12 mm, β ≧ 25 °. That is, a region below the straight line that passes through a position 12 mm below the height position 40 of the wiping nozzle 4 at the side end 500 and is inclined by 25 ° with respect to the vertical direction is surely cut out. As a result of repeating the experiment, it is in this region that the scattered molten metal adheres to the baffle plate 5, and it is possible to avoid the molten metal from adhering to the baffle plate 5 by notching this region.

  According to such a method of manufacturing the baffle plate 5 and the plated metal strip, the jetting from each wiping nozzle 4 and colliding with the plate body 50 is performed between the side end portion 500 and the inclined surface 510 along the plate body 50. Since the descending gas flow 4a and the gas flow 4a jetted from each wiping nozzle 4 and colliding with the plate body 50 and then obliquely downward along the inclined surface 510 collide with each other, they are scattered in the vicinity of the wiping nozzle 4. The molten metal can be prevented from adhering to the metal strip 2, and the scattering of the molten metal on the bath surface of the molten metal plating bath 1 can be suppressed. As a result, it is possible to prevent the appearance of the product from deteriorating and to prevent peripheral equipment from being damaged.

  Further, since A to E and α shown in FIG. 4 are set so as to satisfy the above formula, the flow of the gas flow 4a directed downward in the vertical direction can be sufficiently weakened, and the bath surface of the molten metal plating bath 1 Thus, it is possible to more reliably avoid the molten metal from being scattered.

  Further, the plate body 50 passes through a position 12 mm below the height position 40 of the wiping nozzle 4 at the side end portion 500, and a region below a straight line inclined by 25 ° with respect to the vertical direction is cut away. Therefore, it can avoid that a molten metal adheres to the baffle plate 5, and can reduce the man-hour required for a maintenance.

DESCRIPTION OF SYMBOLS 1 Molten metal plating bath 2 Metal strip 4 Wiping nozzle 4a Gas flow 5 Baffle plate 50 Plate body 500 Side edge 510 Inclined surface

Claims (4)

By being disposed between a pair of wiping nozzles disposed on the sides of the metal strip pulled up from the molten metal plating bath, the gas flows ejected from the wiping nozzles are mutually on the sides of the metal strip. A baffle plate for avoiding a collision,
A flat plate body;
An inclined surface provided at a position away from the side end portion of the plate body with respect to the width direction of the plate body, and protruding from the lower end surface of the plate body along the plate thickness direction of the plate body,
A gas flow that descends between the side end portion and the inclined surface along the plate body after being ejected from the respective wiping nozzles and colliding with the plate body, and ejected from the respective wiping nozzles to the plate body A baffle plate characterized by being configured to collide with gas flows directed obliquely downward along the inclined surface after colliding with each other. The extension width of the inclined surface along the width direction of the plate body is A,
The extending width of the inclined surface along the plate thickness direction of the plate body is B,
The rising angle of the inclined surface with respect to the horizontal is α,
The distance that the inclined surface is separated from the side end portion in the width direction of the plate body is C,
The distance from the height position of the wiping nozzle to the lower end of the inclined surface is D,
The distance from the height position of the wiping nozzle to the upper end of the inclined surface is E,
When the injection pressure of the gas flow injected from each wiping nozzle is in the range of 10 kPa to 80 kPa,
A to E and α satisfy the following formula:

The baffle plate according to claim 1.   The plate body passes through a position 12 mm below the height position of the wiping nozzle at the side end portion, and a region below a straight line inclined by 25 ° with respect to the vertical direction is cut out. The baffle plate according to claim 1 or 2, characterized by the above. A flat plate body, and an inclination that is provided at a position away from the side end portion of the plate body with respect to the width direction of the plate body and protrudes from the lower end surface of the plate body along the plate thickness direction of the plate body A method for producing a plated metal strip using a baffle plate having a surface,
The baffle plate is disposed between a pair of wiping nozzles disposed on the sides of the metal strip pulled up from the molten metal plating bath, and the plate is ejected from the wiping nozzles and collides with the plate body. A gas flow that descends between the side end portion and the inclined surface along the main body, and a gas flow that is jetted from the wiping nozzles and collides with the plate main body and then proceeds obliquely downward along the inclined surface. The manufacturing method of the metal-plating strip characterized by making mutually collide.

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