JPH0641710A - Wiping nozzle - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a nozzle for controlling the deposition amount of a continuous hot-dip metal plating facility for metal strips, and provides a nozzle having improved splash and noise. In a wiping nozzle 5 installed for the purpose of wiping molten metal on the front and back of the strip 1,
A wiping nozzle, characterized in that the suction chamber 9 is provided in the immediate vicinity of the blowout nozzle 12, and the suction chamber 9 is installed with a slight offset in the vertical direction. [Effects] Splash generated during wiping is sucked by the blowing chamber to eliminate harmful effects due to splash, and noise is reduced by avoiding collision of gases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deposit amount control nozzle for continuous hot dip metal plating equipment for metal strips.

[0002]

2. Description of the Related Art Conventional wiping nozzles for controlling the amount of deposited molten metal include those disclosed in JP-A-55-85664 and JP-A-56-108867. The feature of this nozzle is to install a sharp-pointed nozzle on both sides of a metal strip rising vertically from the molten metal bath to scrape off the molten metal. In order to achieve this, a large amount of high-pressure wiping gas is blown out from the nozzle, and wiping by this gas is used as a technical means.

Japanese Laid-Open Patent Publication No. 55-85664 describes a method of preventing the generation of splash by using a support roll for sandwiching a metal strip and a blowing nozzle having a small tip angle.

Further, Japanese Patent Laid-Open No. 56-108867 describes a method of preventing the splash from adhering to the blowout nozzle by forming the outer surface of the blowout nozzle with carbon or a molten metal anti-adhesive agent mainly composed of carbon. ing.

[0005]

The nozzle described above has the following problems. When the traveling speed of the metal strip is increased due to the recent demand for higher speed of the line, it is necessary to increase the blowing pressure from the wiping nozzle or reduce the distance between the metal strip and the wiping nozzle to increase the wiping force. is there.

At this time, splashes of molten metal called splashes are scattered around and adhere to the wiping nozzle to disturb the flow of the wiping gas, and eventually the wiping performance is deteriorated by clogging the gas outlet.

Further, in the portion where there is no metal strip, the gases blown from the opposing wiping nozzles collide with each other to generate a very large noise, thereby deteriorating the working environment. In order to prevent the collision of these gases with each other, it is conceivable to install the blowing nozzles facing each other vertically, but in this case splash generation from the end of the metal strip increases, so splash treatment measures are necessary. Become.

The present invention solves the above-mentioned conventional problems and provides a wiping nozzle capable of speeding up the line without deteriorating the wiping performance and deteriorating the working environment due to noise. is there.

[0009]

To achieve this object, the present invention provides a suction device for sucking molten metal droplets in the vicinity of a blowing nozzle in a wiping nozzle for controlling the amount of deposition in a continuous molten metal plating facility. . Further, a pair of blow-out nozzles provided opposite to each other in the wiping nozzle were installed so as to be vertically shifted.

[0010]

As described above, according to the present invention, since the suction device for sucking the splash of the molten metal is provided in the vicinity of the blowing nozzle as described above, the splash of the molten metal does not stay in the vicinity of the blowing nozzle and can be quickly sucked by the suction device. Since it is sucked, splash of molten metal does not adhere to the blowout nozzle.

By arranging the blowout nozzles so as to be vertically displaced, outside the end of the strip, the molten metal droplets are sucked by a suction device provided in the vicinity of the blowout nozzles before they collide with the opposing blowout nozzles. Of course, since the gas from the blowing nozzle does not collide, the gas collision noise is eliminated.

[0012]

An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show a side view and a front view of a plating machine of a molten metal plating line. In the figure, 1 is a metal strip,
2 is a molten metal, 3 is a melting pot, 4 is a sink roll, 5 is a wiping nozzle, and 6 and 7 are support rolls.

3 and 4 show an embodiment of the wiping nozzle according to the present invention. In the figure, 5 is a wiping nozzle, 8 is a blowing chamber, 12 is a blowing nozzle, and 9 and 10 are suction chambers. Reference numeral 11 is a suction device including a suction chamber and an exhaust device (not shown). Although the blow-out nozzle and the suction nozzle are integrated in the figure, it is of course possible to divide this structure.

FIG. 3 shows the gas flow when there is a metal strip between the wiping nozzles. FIG. 4 shows the gas flow in the absence of a metal strip between the wiping nozzles, ie in the outer part of the metal strip.

In the state shown in FIG. 3, the wiping gas blows out from the blowing nozzle 12 and collides with the metal strip 1 to wipe the molten metal. As described above, at this time, the molten metal splashes. The gas containing the droplets is sucked from the suction chambers 9 and 10 installed above and below the blowing chamber 8 and discharged to the outside of the system. This can prevent molten metal from adhering to the nozzle body.

Further, in the state of FIG. 4, the wiping gas is discharged into the suction chambers facing each other without colliding with each other. Therefore, since there is no gas collision, it is possible to greatly reduce the noise at the wiping nozzle portion.

[0017]

As described above, by providing the suction device for sucking the splash of the molten metal in the vicinity of the blowing nozzle of the wiping nozzle, the splash generated during the wiping is discharged to the outside of the system, and the equipment failure due to the splash occurs. Can be eliminated altogether. Further, it is possible to minimize the collision of the wiping gas and prevent the work environment from being deteriorated by noise.

[Brief description of drawings]

FIG. 1 is a side view of a plating machine of a molten metal plating facility according to the present invention.

FIG. 2 is a front view of a plating machine of a molten metal plating facility according to the present invention.

FIG. 3 is a sectional view taken along the line center of the wiping nozzle according to the present invention.

FIG. 4 is a sectional view of an end portion of a wiping nozzle according to the present invention.

[Explanation of symbols]

 1 Metal Strip 2 Molten Metal 3 Pot 4 Sink Roll 5 Wiping Nozzle 6 Support Roll 7 Support Roll 8 Blow Chamber 9 Suction Chamber 10 Suction Chamber 11 Suction Device 12 Blow Nozzle

Claims (2)

[Claims] 1. A wiping nozzle, wherein a suction device for sucking a splash of molten metal is provided in the vicinity of a blowing nozzle in a wiping nozzle for controlling an adhesion amount of a continuous molten metal plating facility. 2. The wiping nozzle according to claim 1, wherein a pair of blowing nozzles provided opposite to each other are arranged so as to be vertically displaced.