JP3869767B2 - Slit nozzle for air wiping treatment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slit nozzle for air wiping processing that can uniformly eject a fluid from the entire slit-shaped ejection port.
[0002]
[Prior art]
For example, in a plating process in an iron factory, an air wiping process is performed for the purpose of uniform and thin-film application of a chromate treatment solution. In this case, it is common to use a so-called slit nozzle for air wiping processing, in which a fluid supply pipe is provided on the upper surface of a horizontally long nozzle body and a slit-like jet nozzle is provided on the lower end. It is.
[0003]
As the air wiping slit nozzle , for example, as shown in FIG. 3, a fluid supply pipe 11 is provided on one side edge of the upper surface of the horizontally long nozzle body 10, and a slit-like jet nozzle 12 is provided at the lower end. What is provided is known. However, according to the research of the present inventors, in such a fluid nozzle, the fluid ejection state is strong at both sides of the ejection port and weak at the central portion, and the fluid is ejected uniformly from the entire ejection port 12. It was confirmed that this was not possible (see the broken line in the figure). As a result, there has been a problem in that dirt or the like remains on the steel plate after the air wiping treatment to generate defective products.
[0004]
Therefore, as shown in FIG. 4, the slit-like ejection port 12 is formed so as to gradually narrow toward a side edge portion of the fluid supply pipe 11, and the amount of fluid ejected at the lower part of the fluid supply pipe 11 Tried to suppress. However, in this case, although the amount of fluid ejection can be suppressed as expected in the lower portion of the fluid supply pipe 11, the fluid ejection becomes stronger on the other end side, and the fluid is ejected uniformly throughout the ejection port 12. It was not possible (see the broken line in the figure).
[0005]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, and can uniformly eject a fluid from the entire slit-like ejection port. As a result, the air wiping process can be performed uniformly and the post-treatment can be performed. The present invention has been completed for the purpose of providing a slit nozzle for air wiping treatment that can reliably prevent dirt and the like from remaining on a steel plate.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a slit nozzle for an air wiping process in which a fluid supply pipe is provided at one side edge of the upper surface of a horizontally long nozzle body and a slit-like jet outlet is provided at the lower end. In addition, a rectifying plate inclined toward the center is provided in the lower part of the fluid supply pipe, and a rectifying plate inclined in the same manner as the rectifying plate is provided in the other end side corner portion. The slit nozzle for air wiping processing is characterized in that fluid can be uniformly ejected from the entire ejection port.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 and 2 show the case where the present invention is applied to a fluid nozzle for air wiping in chromate treatment, in which 1 is a horizontally elongated nozzle body and 2 is one side of the upper surface of the nozzle body 1. A fluid supply pipe 3 provided at the edge portion is a slit-like jet nozzle provided at the lower end of the nozzle body 1, and the above configuration is basically the same as that of a conventional fluid nozzle of this type. The slit-shaped jet nozzle 3 has a constant width of about 0.3 mm as shown in FIG.
[0008]
In the present invention, a rectifying plate 4a inclined toward the center is provided at the lower portion of the fluid supply pipe 2, and a rectifying plate 4b inclined similar to the rectifying plate 4a is provided at the other end corner portion. This is a characteristic configuration.
By providing such rectifying plates 4a and 4b, fluid can be uniformly ejected from the entire slit-like ejection port 3. That is, the fluid is guided downwardly from the fluid supply pipe 2 by guiding the fluid to the jet outlet 3 while being bent obliquely toward the center by the rectifying plate 4a provided at the lower portion of the fluid supply pipe 2 so as to be inclined toward the center. It relieves the pressure of the fluid. Moreover, the fluid by the dead end in the upper left corner part of the nozzle body 1 by guiding the fluid to the jet port 3 while bending the fluid downward by the rectifying plate 4b inclined similarly to the rectifying plate 4a provided at the other end side corner part. It prevents the pressure from rising.
Thus, by providing the rectifying plates 4a and 4b, it is possible to accurately prevent an increase in fluid pressure at both side portions and to uniformly eject the fluid from the entire slit-like ejection port 3.
[0009]
As shown in FIG. 2, the slit nozzle is generally made by combining a pair of symmetrically divided members 1a and 1a, and the rectifying plates 4a and 4b are divided into the divided members. 1a and 1a are sandwiched and fixed. In addition, a solid plate may be used as the rectifying plate. In short, an inclined surface that guides the fluid to the ejection port 3 while bending the fluid obliquely may be provided in the nozzle body 1.
[0010]
As described above, in the present invention, the rectifying plate 4a inclined toward the center is provided in the lower portion of the fluid supply pipe 2, and the rectifying plate 4b inclined in the same manner as the rectifying plate 4a is provided in the other end side corner portion. Therefore, the fluid on both sides supplied from the fluid supply pipe 2 is guided to the jet outlet 3 while one side of the fluid is slanted to the center side by the rectifying plate 4a, and the other side is guided downward by the rectifying plate 4b. It will be guided to the spout 3 while bending. As a result, an increase in fluid pressure at both side portions is accurately prevented, and fluid is uniformly ejected from the entire slit-like ejection port 3 (see the broken line in FIG. 1A). Wiping processing and the like can be performed.
[0011]
【The invention's effect】
As is clear from the above description, the present invention can uniformly eject a fluid from the entire slit-shaped ejection port, and as a result, the air wiping process can be performed uniformly on the treated steel plate. It is possible to reliably prevent dirt and the like from remaining.
Therefore, the present invention contributes greatly to the development of the industry as a slit nozzle for air wiping treatment that has eliminated the conventional problems.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing an embodiment of the present invention, and FIG. 1B is a view showing the shape of a jet port.
FIG. 2 is a cross-sectional view showing an embodiment of the present invention.
3A is a cross-sectional view showing a conventional example, and FIG. 3B is a view showing the shape of a jet port.
4A is a cross-sectional view showing another conventional example, and FIG. 4B is a view showing the shape of a jet port.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle main body 2 Fluid supply pipe 3 Slit-shaped jet nozzle 4a Current plate 4b Current plate

Claims (1)

In a slit nozzle for air wiping treatment , a fluid supply pipe is provided at one side edge of the upper surface of a horizontally long nozzle body, and a slit-like jet nozzle is provided at the lower end, and the lower part of the fluid supply pipe is inclined toward the center. In addition to providing a rectifying plate, the other end side corner portion is also provided with a rectifying plate that is inclined in the same manner as the rectifying plate, and by providing the rectifying plate , fluid can be uniformly ejected from the entire slit-like injection port. A slit nozzle for air wiping processing .

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