JPH0461950A - Electrocoating device - Google Patents

Abstract

PURPOSE:To obtain a good finish coating by a method wherein a liq. electrocoating material is sprayed locally in the positions difficult for the circulating coating streams to make contact therewith in an electrocoating tank and, by such spraying, the coating streams are produced around the aforesaid positions. CONSTITUTION:A plurality of objects A immersed for coating in a liq. electrocoating material within an electrocoating tank 1 are retained for a predetermined time therein in a tact-free conveying, so that the coating material adheres to the objects A. In this tact-free conveying, places difficult for the circulating coating streams of the coating material L to make contact therewith are created in the positions X and Y between each adjacent object A. To produce the coating streams in the aforesaid positions, a nozzle 31 is provided as an liq. electrocoating spray means 3 to locally spray the coating material L. The nozzle 31 is set on the bottom of the tank 1 with its orifice facing upwards.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrodeposition apparatus, and more specifically, the present invention relates to an electrodeposition apparatus, and more specifically, the present invention relates to an electrodeposition apparatus, and more specifically, an electrodeposition tank that stores an electrodeposition liquid in which an object to be coated is immersed for electrodeposition coating. The present invention relates to an electrodeposition apparatus provided with an electrodeposition liquid circulation means for generating a circulating flow of the electrodeposition liquid in a tank.

[Conventional technology]

In a conventional electrodeposition apparatus, a plurality of nozzles capable of spouting the electrodeposition liquid are usually installed at the bottom of the electrodeposition tank as the electrodeposition liquid circulation means. By spouting the electrodeposition liquid from the nozzle, a circulation flow in the tank is generated in the electrodeposition liquid such that horizontal flows in opposite directions are generated in the upper layer and the lower layer, and the circulation flow in the tank is Based on this, measures have been taken to prevent the paint from settling and to remove bubbles that are disadvantageous to painting (specifically, bubbles from H2 gas, etc.) from the object to be coated.

[Problem to be solved by the invention]

When electrodeposition is performed using such an electrodeposition apparatus, even if the above-mentioned countermeasure is taken by causing a circulating flow of the electrodeposition liquid in the tank, the electrodeposition will not occur on the coated object immersed in the electrodeposition liquid. There are areas that are difficult to reach with the circulating flow of the liquid in the tank.

Therefore, in areas of the object to be coated that are difficult to be touched by the in-tank circulation flow, stagnation occurs in the in-tank circulation flow, and the disadvantageous bubbles cannot be promptly removed from the object to be coated. These factors have caused a problem in that the finish quality of the coating deteriorates.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrodeposition apparatus that can solve the above-mentioned problems.

[Means to solve the problem]

The first characteristic configuration of the electrodeposition apparatus according to the present invention is that an electrodeposition tank for storing an electrodeposition liquid in which the object to be coated is immersed for electrodeposition coating is provided.
An electrodeposition apparatus is provided with an electrodeposition liquid circulation means for generating a circulation flow of the electrodeposition liquid in the tank, the electrodeposition apparatus comprising: an electrodeposition liquid circulating means for generating a circulating flow of the electrodeposition liquid in the tank, the electrodeposition liquid flowing through the electrodeposition liquid on the object to be coated immersed in the electrodeposition liquid; Electrodeposition liquid ejection means for locally ejecting the electrodeposition liquid is provided in areas that are difficult to be hit by the internal circulation flow, and its functions and effects are as follows.

[For production]

In the case of the electrodeposition apparatus of the present invention, the electrodeposition liquid is locally sprayed onto a portion that is difficult to be hit by the circulating flow of the electrodeposition liquid in the tank using the electrodeposition liquid jetting means, and the ejection causes the electrodeposition liquid to be sprayed onto the portion where the circulation flow of the electrodeposition liquid in the tank is difficult to hit. An electrodeposition liquid flow can be generated around the electrodeposited liquid.

〔Effect of the invention〕

In this way, the flow of the electrodeposition liquid that occurs around areas that are difficult to reach with the circulation flow of the electrodeposition liquid in the tank can eliminate stagnation in the circulation flow in the tank and remove the bubbles from the object to be coated.

As a result, the finished quality of the coating, which had deteriorated due to the stagnation and bubbles, becomes good, and the conventional problems are resolved.

C. Second characteristic configuration of the present invention] A second characteristic configuration of the electrodeposition apparatus according to the present invention is such that a plurality of objects to be coated are immersed in the electrodeposition liquid, and An electrodeposition apparatus in which the material to be mixed is electrocoated while being conveyed in a tact within the electrodeposition liquid,
A nozzle for locally spouting the electrodeposition liquid is provided as the electrodeposition liquid jetting means between a plurality of objects to be coated that are immersed in the electrodeposition liquid and are not transported in a tactile manner. It is in.

In such an electrodeposition apparatus, a state in which a plurality of objects to be coated immersed in an electrodeposition solution are not transported in a tact period continues for a certain period of time. In this state, a region is formed between the plurality of objects to be coated, which is difficult for the circulation flow of the electrodeposition liquid to come into contact with. Therefore, by locally spouting the electrodeposition liquid at that part using the nozzle, an electrodeposition liquid flow is generated there, and the electrodeposition liquid flow causes the circulation flow in the tank as in the above case. In addition to eliminating stagnation, the bubbles can be removed from the object to be coated, thereby improving the finish of the coating.

[Example Go Embodiments of the present invention will be described below based on the drawings.

1 and 2 show an embodiment of the electrodeposition apparatus of the present invention, and (1) in the figures indicates an electrodeposition tank.

In the electrodeposition tank (1), an electrodeposition liquid (L) is stored in which the object to be coated (A) (specifically, a car to be coated with the paint by electrodeposition) is immersed for electrodeposition coating. It has become so.

A hanger conveyor (4) is installed above the electrodeposition bath (1) for transporting the object to be coated (A) in a suspended manner in a tactile manner. The hanger conveyor (4) transports the object to be coated (A) to a position above the electrodeposition bath (1) on one end side in a suitable direction, and lowers the object to be coated (A) at the position. and immersing this in the electrodeposition liquid (L), the object to be coated (A)
is stopped in the immersed state, and after a predetermined period of time has elapsed, it is tact-transferred in two stages in the electrodeposition liquid (L), held for a predetermined period of time, and then transferred to the other end of the electrodeposition bath (1) in the moderate direction. the object to be coated (A) immersed in the other end of the electrodeposition tank (1), and the lifted object (A) to be immersed in the electrodeposition tank (1). It is possible to move it from above to another location.

In the electrodeposition tank (1), a plurality of nozzles (2) as the electrodeposition liquid circulation means are installed at the bottom thereof. More specifically, a plurality of nozzles (2) capable of spouting the electrodeposition liquid (L) in the electrodeposition tank (1) are arranged in parallel at predetermined intervals in the tank width direction, Moreover, they are also arranged in parallel at a predetermined interval in the moderate direction. Note that the nozzle (2
) are unified so that the opening direction of the spout is in a fixed direction (slightly downward fixed direction) substantially along the width direction of the tank.

The plurality of nozzles (2) have a circulation path (22) through which the electrodeposition liquid (L) is circulated and fed by the operation of a circulation pump (21).
) are connected to each other, and the electrodeposition liquid (L) fed through the circulation path (22) is spouted from the nozzle (2) into the electrodeposition tank (1). The electrodeposition liquid (L) has horizontal flows in opposite directions in the upper and lower parts of the electrodeposition tank (1), and upstream and downstream flows in opposite directions at the front and rear ends of the electrodeposition tank (1). A circulating flow in the tank (see the arrow in Figure 1) is created, and based on this circulating flow in the tank, it is possible to prevent the paint from settling and eliminate bubbles that are disadvantageous to painting. .

Now, the plurality of objects to be coated (A) immersed in the electrodeposition liquid (L) in the electrodeposition bath (1) are held for a certain period of time in a state where they are not transported in a tact, and the objects to be coated (A) are Paint will adhere to the surface. In the state where the tact transport is not carried out, the distance (X) between the plurality of objects to be coated (A),
A region is formed in (Y) that is difficult to be hit by the circulation flow in the tank of the electrodeposition liquid (L).

Therefore, in this electrodeposition apparatus, in order to generate an electrodeposition liquid flow in a region that is difficult to be hit by the circulating flow in the tank, the electrodeposition liquid (
As shown by the broken line arrow in FIG. 1, a nozzle (31) for ejecting locally is installed as the electrodeposition liquid ejecting means (3).

The nozzle (31) is installed at the bottom of the electrodeposition tank (1) with its opening facing upward. In addition, the nozzle (
The electrodeposition liquid (L) is supplied to the electrodeposition liquid (L) through a branch path (32) branched from the circulation path (22) that supplies the electrodeposition liquid (L) to the nozzle (2) serving as the electrodeposition liquid circulation means. ).

[Another example]

In the above-mentioned embodiment, the present invention is applied to an electrodeposition apparatus in which a plurality of objects to be coated are dipped in an electrodeposition tank, transported in a tact, and continuously processed. Even in electrodeposition equipment of the type in which the objects to be coated are immersed one by one and batch processing is performed individually, and in the type of electrodeposition equipment in which the objects to be coated are loaded into the tank, moved within the tank, and taken out of the tank in an assembly line manner, The present invention is applied. In other words, even in such an electrodeposition apparatus, there may be areas that are difficult to reach with the circulation flow in the tank, but it is necessary to generate an electrodeposition liquid flow in those areas (using a nozzle that locally sprays the electrodeposition liquid). It is also possible to consider an embodiment in which the electrodepositing liquid is installed as the electrodepositing liquid jetting means.

Further, the circulation form of the circulation flow in the tank formed by the electrodeposition liquid circulation means (2) can be changed in various ways, for example, the flow direction at the bottom of the tank or from the center of the tank to one end and the other end. The circulating flows in the tank with the circulation directions opposite to each other are
) at one end and the other end, and a trough-like drainage part for receiving and introducing the surface flow of the recirculating flow may be provided between the two circulating flow forming regions in the upper layer.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

FIG. 1 is a side view of an electrodeposition apparatus according to the present invention, and FIG. 2 is a plan view of the electrodeposition apparatus. (1)... Electrodeposition bath, (2)... Electrodeposition liquid circulation means, (3)... Electrodeposition liquid-spraying means, (3
1)...Nozzle, (A)...Object to be coated,
(L)... Electrodeposition liquid.

Claims (1)

[Scope of Claims] 1. In an electrodeposition tank (1) that stores an electrodeposition liquid (L) in which the object to be coated (A) is immersed for electrodeposition coating, a tank containing the electrodeposition liquid (L) is provided. An electrodeposition apparatus is provided with an electrodeposition liquid circulation means (2) for generating a circulation flow, the electrodeposition liquid (L) being immersed in the electrodeposition liquid (L) on the object to be coated (A). (L) In areas where the circulation flow in the tank is difficult to reach,
Electrodeposition liquid spouting means (for locally spouting the electrodeposition liquid (L))
3) Electrodeposition equipment equipped with. 2. A plurality of objects to be coated (A) are immersed in the electrodeposition liquid (L), and the plurality of objects to be coated (A) are immersed in the electrodeposition liquid (L). The electrodeposition apparatus is configured to perform electrodeposition coating while being conveyed in a tact manner, and the plurality of objects to be coated (A) are immersed in the electrodeposition liquid (L) and are not conveyed in a tact manner. The electrodeposition liquid (
2. The electrodeposition apparatus according to claim 1, further comprising a nozzle (31) for locally spouting the electrodeposition liquid (L) as the electrodeposition liquid jetting means (3).