JPH07216594A - Electrodeposition coating device - Google Patents

Abstract

PURPOSE:To provide an electrodeposition coating device by which the sticking of the deposit formed on the anode member of a cationic electrodeposition coating device, for example, to a material to be coated is prevented. CONSTITUTION:A material W to be coated dipped in an electrodeposition coating soln. 2 of an electrodeposition tank 3 is used as a cathode, and the plural electrode members 4 dipped in the soln. 2 as an anode. The electrode member 4 at the bottom face part is enclosed by a reticular member 15 with a space in-between, and the deposit on the outer surface of the electrode member 4 is discharged to the outside through the reticular member 15. The reticular member 15 is formed with resin, and the opening of the mesh is controlled to 50-500mum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeposition coating apparatus for preventing a deposit deposited on an electrode member of an anode of a cationic electrodeposition coating apparatus from adhering to an object to be coated.

[0002]

2. Description of the Related Art Heretofore, an apparatus such as Japanese Utility Model Laid-Open No. 58-72165 has been known as a cationic electrodeposition coating apparatus. This device uses the article to be coated immersed in the central part of the electrodeposition tank as the cathode, and the electrode members immersed in the side and bottom parts of the electrodeposition tank as the anode. Is attracted to the surface of the object to be electrophoresed for electro-deposition coating.

[0003]

However, in the case of the above-mentioned technique, since the electrode member of the anode immersed in the electrodeposition tank is in a bare state, the metal in the coating liquid is deposited on the outer peripheral portion of the electrode member during the electrodeposition process. There is a problem that ions are deposited, which are peeled off and float in the paint and adhere to the object to be coated.

[0004]

In order to solve the above-mentioned problems, the present invention uses an object to be coated immersed in an electrodeposition tank as an electrode on one side, and an electrode member immersed in a naked state in the electrodeposition tank on the other side. In an electrodeposition coating apparatus configured to perform electrodeposition coating as a side electrode, a bare electrode member is surrounded by a mesh member with a gap, and foreign matter deposited on the outer surface of the electrode member is externally separated from the mesh member. I tried to prevent it from leaking to.

Further, the mesh member is made of resin, and the mesh of the mesh member is 50 to 500 μ mesh.

[0006]

By surrounding the bare electrode member with a gap, it is possible to prevent deposits deposited on the outer surface of the electrode member from adhering to the object to be coated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electrodeposition coating apparatus of the present invention will be described with reference to the attached drawings. 1 is an overall view of the electrodeposition coating apparatus, FIG. 2 is an enlarged view of a main part, and FIG. 3 is a sectional view taken along the line AA of FIG.

As shown in FIG. 1, an electrodeposition coating apparatus 1 according to the present invention has an electrodeposition tank 3 for storing an electrodeposition coating liquid 2 and a plurality of side surfaces and a bottom surface in the electrodeposition tank 3. Electrode member 4, ...
And a circulation mechanism 5 for circulating the electrodeposition coating liquid 2 and a PH concentration adjusting mechanism 6 for adjusting the PH concentration of the electrodeposition coating liquid 2.
The object W to be coated is immersed in the center of the electrodeposition tank 3.

Then, the electrode members 4, ... Are used as anodes,
A so-called cationic electrodeposition apparatus is configured to deposit positively charged paint particles on the surface of the article W by energizing the article W with the cathode as a cathode.

The circulation mechanism 5 has a pump 8 for sucking the electrodeposition coating liquid 2 in the electrodeposition tank 3 from a suction pipe 7 and an electrodeposition in the electrodeposition tank 3 for the sucked electrodeposition coating liquid through a pressure feed pipe 9. A riser pipe 10 for spraying the coating liquid 2 is provided, and convection is caused in the electrodeposition coating liquid 2 by circulating the electrodeposition coating liquid 2 in the electrodeposition tank 3 to prevent the precipitation of pigments and the like and to reduce the coating concentration. I try to keep it uniform.

The PH concentration adjusting mechanism 6 is provided with a diaphragm 11 provided around the side surface of the electrodeposition tank 3 so as to cover the periphery of the electrode member 4, and the diaphragm 11 blocks the inclusion of pigments and the like. Tank 1 for taking out and storing the electrodeposition coating liquid 2a
2 and a pure water supply pipe 13 for measuring the PH concentration of the electrodeposition coating liquid 2a in the tank 12 and supplying pure water so as to keep the PH concentration of the electrodeposition coating liquid 2a constant, The electrodeposition coating liquid 2a adjusted to 1 is returned to the inside of the electrodeposition tank 3 (the inside of the diaphragm 11) by the pump 14.

The diaphragm 11 is an ion exchange membrane having a selective permeability for ions, and blocks paint components such as pigments.

By the way, a net member 15 is provided and surrounded around the electrode member 4 on the bottom surface.

As shown in FIGS. 2 and 3, the mesh member 15 is wound around a plurality of supporting members 16, ... Which radially project from the electrode member 4, and has a gap s from the electrode member 4. Side plates 1 at both ends while being integrally configured
Both 7 and 17 are integrated.

That is, the side plates 17, 17, the electrode member 4, the plurality of supporting members 16, ..., And the net member 15 are integrated so that they can be attached to the mounting member 18 by a plurality of bolts. In this case, it is performed integrally, and is positioned and fixed to the bottom surface of the electrodeposition tank 3 by a plurality of annular holding members 19.

The mesh member 15 is made of resin,
Moreover, the size of the mesh is equivalent to 50 to 500 mesh, which is large enough to prevent passage of the deposits deposited on the electrode member 4.

In the electrodeposition coating apparatus 1 as described above, when electrodeposition coating is carried out with the object W to be the cathode and the electrode member 4 as the anode, the electrode member 4 on the lower surface which is in direct contact with the electrodeposition coating liquid 2
In the vicinity of the outer peripheral portion of, the metal ions contained in the pigment and the like are precipitated and hardened.

That is, such a metal deposit is, for example, lead (Pb), copper (Cu), zinc (Zn), titanium (T).
i), silicon (Si) aluminum (Al), strontium (Sr), and the like.

In the conventional case, the deposits formed in the vicinity of the outer peripheral portion of the electrode member 4 are easily separated by convection generated by the circulation mechanism 5 and float in the electrodeposition coating liquid 2 to be coated. Although it adhered to the surface of W, in the case of the present application, it does not flow out from the net member 15. That is, it is possible to eliminate the problem that foreign matter adheres to the article W to be coated.

When a certain amount of precipitate is deposited and hardened on the electrode member 4 itself, it is replaced integrally with the net member 15.

The electrode member 4 on the side surface is formed by the electrodeposition coating liquid 2
Since there is no direct contact with the above-mentioned pigment, there is no risk of precipitation hardening.

Further, it is not preferable to surround the electrode member 4 on the bottom surface with the diaphragm 11 and connect it to the PH concentration adjusting mechanism 6 like the electrode member 4 on the side surface because of the PH concentration of the electrodeposition coating liquid 2. .

[0023]

As described above, in the electrodeposition coating apparatus of the present invention, the electrode member immersed in the bare state is surrounded by the net member with a gap, so that it is deposited on the outer surface of the bare electrode member. It is possible to prevent problems such as deposits adhering to the object to be coated. Therefore, there is an effect that the coating quality is improved.

[Brief description of drawings]

[Figure 1] Overall configuration diagram of this electrodeposition coating device

FIG. 2 is an enlarged view of a main part with a part cut away.

FIG. 3 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 Electro-deposition coating device 2 Electro-deposition coating liquid 3 Electro-deposition tank 4 Electrode member 15 Net member W W to be coated

Claims (3)

[Claims] 1. An electrodeposition method in which an object to be coated immersed in an electrodeposition tank is used as an electrode on one side, and an electrode member which is nakedly immersed in the electrodeposition tank is used as an electrode on the other side for electrodeposition coating. In the coating apparatus, the bare electrode member is surrounded by a mesh member with a gap so as to prevent foreign matter deposited on the outer surface of the electrode member from flowing out of the mesh member. An electrodeposition coating device. 2. The electrodeposition coating apparatus according to claim 1, wherein the mesh member is made of resin. 3. The electrodeposition coating apparatus according to claim 1 or 2, wherein the mesh of the mesh member is a mesh of 50 to 500 μm.