JPH0421829Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an electrodeposition tank used for electrodeposition coating, and more specifically, nozzles for circulating the stored electrodeposition liquid in the tank are installed in parallel at the bottom and top of the tank. Regarding the electrodeposition tank installed.

[Conventional technology]

The above-mentioned electrodeposition tank has a fluid jetting force of a nozzle. [Prior art] Conventionally, as a tank structure that takes into account the circulation of the stored electrodeposition liquid in the tank, as shown in The tank bottom was merely sloped at both ends of the tank 1 in the circulation direction. 3 in the figure is a nozzle.

[Problem that the invention attempts to solve]

However, in an attempt to more effectively prevent paint from settling, eliminate bubbles, and improve painting efficiency, the ejection power of the nozzle installed at the bottom of the tank was increased to speed up the circulation of the stored electrodeposition liquid within the tank. If the value is increased, the liquid level will rise at the end of the tank on the side where the circulating electrodeposition liquid rises, causing a problem in which a large amount of bubbles will be generated, which will have a negative impact on the coating. It was hot.

The purpose of the present invention is to effectively suppress the generation of bubbles at the end of the tank due to the increase in the circulation speed in the tank, as described above, by making rational and simple improvements to the tank structure. .

[Means for solving problems]

The characteristic configuration of the electrodeposition tank according to the present invention is that the tank faces the path through which the stored electrodeposition liquid changes from the rising process to the upper flow of the tank during circulation of the stored electrodeposition liquid in the tank by nozzles provided at the bottom and top of the tank. The inner surface of the one end side wall is formed with an arcuate curved guide surface whose side view is concave toward the inside of the tank, and its functions and effects are as follows.

[Effect]

In other words, in the above-mentioned configuration, the circulating and stored electrodeposited liquid that is diverted from the rising process to the upper flow of the tank is guided by the curved guide surface and is smoothly diverted, so that the electrodeposited solution boils up like in a conventional tank. The rising of the liquid level at the end of the tank under such conditions is effectively suppressed, and accordingly, the generation of bubbles due to such rising is also effectively suppressed.

[Effect of idea]

As a result, while avoiding the generation of a large amount of new bubbles, it is possible to increase the circulation speed of the stored electrodeposition liquid in the tank by increasing the jetting force of the nozzle, which prevents settling of the paint, eliminates bubbles, and improves the coating process. Various functions such as improved efficiency and circulation within the electrodeposition tank can be further enhanced, and the overall performance of the electrodeposition tank can be greatly improved compared to the conventional method.

〔Example〕

Next, an example will be explained.

1 and 2 show an electrodeposition tank 1 in which an object A to be coated is immersed in a stored electrodeposition liquid L to perform electrodeposition coating. One end side is immersed in the stored electrodeposition liquid L.
Then, at the other end of the tank 1, it is pulled up from the stored electrodeposition liquid L and sent to the next process.

At the bottom of the tank 1, a plurality of ejector nozzles 3 are arranged in parallel at predetermined intervals in the width direction of the tank, and are oriented somewhat diagonally downward in the opposite direction to the conveying direction of the object to be coated A. The groups are arranged in parallel in the longitudinal direction of the tank.

In other words, as described above, by ejecting the electrodeposition liquid from the three groups of nozzles provided at the bottom of the tank, the stored electrodeposition liquid L is caused to flow in the opposite direction to the conveying direction of the object to be coated at the bottom of the tank, and at the same time, at the top of the tank, the electrodeposition liquid L is The paint is circulated in the tank in a state where it flows in the same direction as the material transport direction, thereby preventing the paint from settling, eliminating bubbles that adversely affect the painting, and improving painting efficiency.

In addition, an ejector nozzle 4 is installed in the upper layer of the stored electrodeposited liquid L in the upper part of the tank, in the same direction as the conveying direction of the object to be coated, but slightly tilted toward the left and right center of the tank, so as not to obstruct the progress of the object to be coated. They are arranged in parallel in the longitudinal direction of the tank near the left and right walls 1a and 1b of the tank, respectively, and the electrodeposition jets from four groups of nozzles in the upper layer assist the circulation of the stored electrodeposition liquid L in the tank. , the function of flushing away and removing bubbles generated at one end of the tank as the object A is immersed is enhanced.

In the figure, 5 and 6 are circulation paths for circulating and supplying the electrodeposition liquid to each nozzle 3 and 4, 7 is a circulation pump, and 8 is a filter.

The tank bottoms at both ends in the longitudinal direction of the tank 1 are sloped bottoms 1c and 1d that become higher toward the ends of the tank, thereby smoothing the circulation of the stored electrodeposition liquid L in the tank and eliminating corner portions. This prevents paint from settling and accumulating at the corners.

Moreover, as shown in FIGS. 1 and 3, the object to be coated A
The inner surface side of the tank wall 1e at the end of the tank where the electrodeposition liquid L is immersed in the stored electrodeposition liquid L, that is, the one end of the tank facing the path where the stored electrodeposition liquid L is diverted from the rising process to the upper flow of the tank during circulation in the tank. An arc-shaped curved guide plate 9 whose cross-sectional shape in side view is concave toward the inside of the tank is provided on the inner surface of the side wall 1e. By guiding the flow of the circulating electrodeposition liquid L to be changed from the flow to the upper flow of the tank and making the change of direction to the upper flow of the tank smooth,
The liquid level is prevented from rising at the end of the tank when the electrodeposition liquid L is boiling up, and a large amount of bubbles are prevented from being generated due to the rise of the liquid level in such a boiling state.

[Another example]

Next, another example will be listed.

(a) As shown in FIG. 4, the inclined bottom at the end of the tank may be eliminated, and an arc-shaped curved guide surface a may be formed extending from the lowest bottom of the tank 1.

(b) To form the curved guide surface a, instead of attaching a curved guide plate to the inner surface of the side wall at one end of the tank, the side wall 1e at one end of the tank itself is bent into an arc shape, as shown in FIG. A curved guide surface a may be formed, and various improvements can be made to the specific formation structure of the curved guide surface.

(C) As shown in FIG. 5, the arc-shaped curved guide surface a may be formed in a polygonal configuration.

(d) It is preferable that the tangential direction of the arc-shaped curved guide surface near the liquid surface be close to the horizontal direction, but the specific inclination angle of the tangential direction may be determined as appropriate, and the tangential direction The structure may be such that the inclination angle can be adjusted and changed as appropriate.

Incidentally, although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention,
FIG. 1 is an overall sectional view, FIG. 2 is a plan view, and FIG. 3 is an enlarged sectional view. 4 and 5 are enlarged sectional views showing another embodiment of the present invention, respectively. FIG. 6 is a sectional view showing a conventional example. 3... Nozzle, 1e... One end side wall of the tank, a... Curved guide surface, L... Reserved electrodeposition liquid.

Claims (1)

[Scope of utility model registration request] This is an electrodeposition tank in which nozzles 3 and 4 are installed at the bottom and top of the tank to circulate the stored electrodeposition liquid L in the tank so that the flow is in opposite directions at the bottom and top of the tank. An arcuate curved guide surface a whose side view shape is concave toward the inside of the tank is formed on the inner surface of the side wall 1e at one end of the tank, which faces the path through which the electrodeposition liquid L changes from the rising process to the upper flow of the tank. Electroplating bath.