JP2575888Y2 - Gas wiping nozzle - Google Patents

Description

[Detailed description of the invention]

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas wiping nozzle capable of easily adjusting the discharge amount distribution in the width direction of a slit-shaped nozzle opening.

[0092]

2. Description of the Related Art In recent years, the amount of plating metal deposited in continuous molten metal plating of steel strips has been adjusted by arranging gas wiping nozzles having slit-shaped nozzle ports on both sides of the steel strip immediately above a plating bath. The method is generally performed by blowing gas onto the surface and wiping. Since the steel strip and the nozzle are not in contact with each other, the speed of passing the steel strip can be increased by applying the coating amount by the nozzle, so that a coating material or other coating agent is applied to the strip or the linear material. Attention has also been paid to the application to the adjustment of the amount of adhesion when performing the process.

As a conventional gas wiping nozzle, as shown in FIGS. 5 and 6, the upper nozzle member 1 and the lower nozzle member 2 are vertically aligned, and a slit-shaped nozzle is formed at the tip. A nozzle port 3 is formed, and a gas passage 4 extending from the base side to the nozzle port 3 is formed. The base side is fixed to the nozzle header 5 and gas is supplied to the gas passage 4 therefrom. I have.

[0093]

In this nozzle, the slit gap shape of the nozzle port 3 is constant over the entire width and the gas discharge amount distribution is based on the premise that the shape of the steel strip in the width direction is always good. Is always used, but the plated steel strip includes those having defective shapes such as defects such as medium elongation. If a steel strip having such a shape defect is passed during plating, the steel strip will bend, and the distance between the nozzle tip and the steel strip at the center and at both ends will be different. Is not constant, and the amount of adhesion changes in the width direction.

In order to prevent variation in the amount of adhesion, for example, in a gas throttle device disclosed in Japanese Patent Publication No. 63-54786, a spare nozzle in which a central slit is widened or narrowed is provided with a spare nozzle on the side opposite to the nozzle header of the nozzle facing the steel strip. Symmetrically, and the nozzle header should be 18
A method of switching the nozzle by rotating the nozzle by 0 degrees is adopted. However, since two nozzles are required, the size of the apparatus is increased, and it takes time to rotate the nozzles. Therefore, it is necessary to pass a dummy material when rotating the nozzles.

[0086]

According to the present invention, a round bar provided with a grinding plane for creating a necessary clearance between the nozzle and the inner wall surface is rotatably provided inside the nozzle body instead of switching between a plurality of nozzles. It is an object of the present invention to provide a wiping nozzle which adjusts the distribution of gas discharge in the nozzle opening width direction by rotating a round bar, and can cope with not only a change in the shape of the base material but also a change in the width and the coating material.

In order to achieve the object, the wiping nozzle of the present invention has a nozzle body in which a gas passage reaching from a base side to a slit-shaped nozzle port provided at a tip portion is formed. An arc-shaped groove formed on the upper inner surface or the lower inner surface of the main body, and a round bar rotatably provided in the arc-shaped groove and having one longitudinal end protruding to the side of the nozzle main body, a straight line in the nozzle width direction. A plurality of flat surfaces having different grinding shapes are formed on the peripheral surface of the round bar at intervals, and the peripheral surface of the remaining round bar is in contact with the upper inner surface and the lower inner surface of the nozzle body. And

[0098]

[Action] Since a round bar is arranged upstream of the nozzle opening so as to protrude from one side of the nozzle opening, the gas supply amount to the nozzle opening is
It is determined by the gap between the round bar peripheral surface and the side opposite to the nozzle opening. However, by rotating the portion of the round bar that protrudes outside the gas nozzle, each plane having a different grinding shape formed on the peripheral surface can be opposed to the opposite side of the nozzle port. The gas supply amount in the width direction at the upstream can be changed, and the gas discharge amount in the nozzle opening width direction can be adjusted. The gas passage wall comes into contact with the portion other than the flat portion of the round bar, and the gas bypasses between the two and does not flow to the nozzle opening, so that the gas from the gas passage is discharged from the nozzle opening.

【Example】

FIGS. 1 to 3 show a gas wiping nozzle of the present invention. The nozzle is a slit-shaped nozzle in which an upper nozzle member 1 and a lower nozzle member 2 are vertically aligned like a conventional nozzle. Although the mouth 3 is formed, the thickness of the upper nozzle member 1 is partially increased as shown in FIG. 3, and a round bar 6 is arranged below the nozzle 3 in parallel with the nozzle 3. I have. The round bar 6 is in contact with an arc-shaped groove 7 formed inside the lower nozzle member 2 so as not to leak gas, and one side protrudes to the outside of the nozzle to engage the rotation operating member with the protruding portion. Are provided.

The two ends of the round bar 6 have a circular shape, and four straight planes A, B, C, and D are arranged at intervals between them in the circumferential direction. And are formed in parallel. 2, the side A facing the nozzle opening 3 of the upper nozzle member 1 is deeply ground on both sides and the intermediate part is ground shallowly. As shown in FIG. It is a plane that is wide and the middle part is narrow, and the gap between the upper nozzle member 1 and the nozzle port 3 is wide on both sides and the middle part is narrow. FIG. 2 shows only one side of the nozzle, but the other side is the same except that the other end of the round bar 6 does not protrude from the nozzle.

In FIG. 2, the surface B facing the front direction is also a plane in which both sides are wide and the middle part is narrow. The grinding depth of the wide and narrow portions is the same as that of the surface A. Is wider than in the case of side A. When the side surface is rotated so as to face the nozzle port 3 of the upper nozzle member 1, the portion separated from the nozzle ports 3 on both sides becomes longer as shown in FIG. 4 (A), 4 (B) and 4 (C) show other planes C-plane and D-plane. These planes are both the planes A and B and the length and width of the wide portions on both sides. The grinding depths of the narrow portions are different and different from each other.

When the steel strip is curved by continuous melting metal plating of the steel strip using this nozzle, if the round bar A surface of the one-sided nozzle is opposed to the nozzle port 3 of the upper nozzle member 1, Since the wide area on both sides of the upstream gap of the nozzle port 3 becomes long, even if the parts farther from the nozzle port 3 on both sides of the steel strip are wide, the plating metal can be wiped to the same extent as the intermediate part. On the other hand, in the case of the opposite nozzle, if the surface of the round bar B faces the nozzle port 3 of the upper nozzle member 1,
Since the length of the wide portion on both sides of the upstream gap of the nozzle port 3 becomes shorter, even if the portions approaching the nozzle port 3 on both sides of the steel strip become narrower, the plating metal can be wiped to the same extent as the intermediate portion.

[0113]

As described above, in the wiping nozzle of the present invention, the round bar provided inside the nozzle opening is rotated, and the grinding plane formed on the round bar is selected. The gap with the inner wall surface is adjusted. Therefore, even if the base material changes during wiping, the distribution of the flow rate of the wiping gas in the width direction of the nozzle is adjusted in accordance with the change, and a constant wiping force is obtained in the width direction.

[Brief description of the drawings]

FIG. 1 is a front view of a gas wiping embodiment according to the present invention.

FIG. 2 is an enlarged view of a partly cutaway portion of the gas wiping shown in FIG. 1;

FIG. 3 is a sectional view taken along line MM in FIG. 2;

FIG. 4 is a front view when a round bar is rotated by 90 degrees.

FIG. 5 is a front view of a conventional gas wiping.

FIG. 6 is a sectional view taken along line NN of FIG. 5;

[Explanation of symbols]

1 upper nozzle member, 2 lower nozzle member, 3 nozzle opening,
4 ... gas passage, 5 ... nozzle header, 6 ... round bar, 7 ... arc-shaped groove, 8 ... projection,

Continuation of front page (56) References JP-A-4-285147 (JP, A) JP-A-47-34126 (JP, A) JP-A-47-34127 (JP, A) JP-A-51-87435 (JP, A) JP-A-52-141430 (JP, A) JP-A-54-8125 (JP, A) JP-A-60-172380 (JP, A) JP-B-36-9347 (JP, B1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B05C 11/00-11/115 C23C 2/20

Claims (1)

(57) [Scope of request for utility model registration] 1. A slit-shaped nozzle provided at a tip portion
Gas nozzle that has a gas passage reaching the mouth from the base side
Inside the nozzle body and inside or below the nozzle body
Arc-shaped grooves formed on the surface, and rotatably provided in the arc-shaped grooves.
Round, one end in the longitudinal direction protruding to the side of the nozzle body
The rod extends linearly in the nozzle width direction and has a different grinding shape.
Are formed on the peripheral surface of the round bar at intervals.
And the peripheral surface of the remaining round bar is the upper inner surface of the nozzle body and
Gas wiping nozzle in contact with lower inner surface .