JP3277064B2 - Electrodeposition coating equipment - Google Patents

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, for example, deposits deposited on an anode electrode member of a cationic electrodeposition coating apparatus from adhering to an object to be coated.

[0002]

2. Description of the Related Art Conventionally, for example, an apparatus as disclosed in Japanese Utility Model Application Laid-Open No. 58-72165 is known as a cationic electrodeposition coating apparatus. This device uses the coating material immersed in the center of the electrodeposition tank as a cathode, the electrode members immersed on the side and bottom of the electrodeposition tank as the anode, and passing an electric current between the two, so that the paint particles Is attracted to the surface of the substrate by electrophoresis to perform electrodeposition coating.

[0003]

However, in the case of the above technique, since the electrode member of the anode to be immersed in the electrodeposition tank is in a bare state, the metal in the coating liquid is applied to the outer peripheral portion of the electrode member during the electrodeposition process. There were problems such as the precipitation of ions, the separation of the ions, the floating of the ions in the paint, and the attachment to the object to be coated.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a method in which an object to be coated immersed in an electrodeposition tank is used as one electrode and an electrode member immersed in the electrodeposition tank in a bare state is used as the other electrode. In the electrodeposition coating apparatus that performs electrodeposition coating as the side electrode, the periphery of the naked electrode member is radiated from the electrode member.
A mesh member that surrounds with a gap by multiple overhanging support members
Is provided to prevent foreign substances deposited on the outer surface of the electrode member from flowing out of the mesh member to the outside.

Further, the mesh member is made of resin, and the mesh of the mesh member is set to a mesh of 50 to 500 μm.

[0006]

By surrounding the electrode member in a bare state with a gap, a precipitate deposited on the outer surface of the electrode member is prevented from adhering to the object to be coated.

[0007]

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

As shown in FIG. 1, an electrodeposition coating apparatus 1 of the present invention comprises an electrodeposition tank 3 for storing an electrodeposition coating liquid 2 and a plurality of electrodeposition tanks 3 immersed in side and bottom portions of the electrodeposition tank 3. Electrode member 4, ...
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 article to be coated W is immersed in the central part of the electrodeposition tank 3.

The electrode members 4,... Are used as anodes,
A so-called cationic electrodeposition apparatus is configured in which a positively charged paint particle is deposited on the surface of the workpiece W by applying a current to the workpiece W as a cathode.

The circulation mechanism 5 includes a pump 8 for sucking the electrodeposition coating liquid 2 in the electrodeposition tank 3 from a suction pipe 7, and an electrodeposition coating in the electrodeposition tank 3 through the pressure feeding pipe 9. The electrodeposition coating liquid 2 is provided with a riser pipe 10 for jetting the coating liquid 2, and circulating the electrodeposition coating liquid 2 in the electrodeposition tank 3, thereby causing convection in the electrodeposition coating liquid 2, preventing precipitation of pigments and the like, and reducing the coating concentration. I try to keep it even.

The PH concentration adjusting mechanism 6 has a diaphragm 11 provided so as to cover the periphery of the electrode member 4 disposed on the side surface inside the electrodeposition tank 3, and the diaphragm 11 blocks the content of pigments and the like. Tank 1 for taking out and storing the deposited electrodeposition coating liquid 2a
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 adjusted electrodeposition coating liquid 2a is returned into the electrodeposition tank 3 (inside the diaphragm 11) by the pump 14.

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

A mesh member 15 is provided 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 support members 16 extending radially from the electrode member 4, with a gap s from the electrode member 4. Side plate 1 at both ends while being integrally formed
7 and 17 are also integrated.

That is, the side plates 17, 17, the electrode member 4, the plurality of support members 16,..., The mesh member 15 are integrated and can be freely attached to the mounting member 18 by a plurality of bolts. At the same time, 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 net member 15 is made of a resin.
In addition, the size of the mesh is equivalent to 50 to 500 mesh, and is large enough to prevent passage of the precipitates deposited on the electrode member 4.

In the electrodeposition coating apparatus 1 as described above, when electrodeposition coating is performed using the object to be coated W as a cathode and the electrode member 4 as an anode, the electrode member 4 on the lower surface portion in direct contact with the electrodeposition coating liquid 2 is obtained.
Metal ions contained in pigments and the like are deposited and hardened in the vicinity of the outer periphery.

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

In the prior art, the precipitates generated near the outer peripheral portion of the electrode member 4 are easily separated by convection or the like generated by the circulation mechanism 5 and float in the electrodeposition coating liquid 2 to be coated. Although attached to the surface of W, in the case of the present application, it does not flow out from the net member 15 to the outside. That is, it is possible to eliminate a problem that a foreign substance adheres to the article to be coated W.

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

Incidentally, the electrode member 4 on the side surface portion is
Because there is no direct contact with the pigment or the like, there is no fear of precipitation hardening.

Further, it is not preferable to surround the electrode member 4 on the bottom surface with the pH concentration adjusting mechanism 6 by surrounding the same with the diaphragm member 11 in the same manner as the electrode member 4 on the side surface portion, because of the PH concentration of the electrodeposition coating liquid 2. .

[0023]

As described above, the electrodeposition coating apparatus of the present invention radiates the periphery of the electrode member immersed in the naked state from the electrode member.
Mesh with a gap by a plurality of support members overhanging
Since the member is provided , it is possible to prevent a problem that a precipitate deposited on the outer surface of the bare electrode member adheres to the object to be coated. Therefore, there is an effect that the coating quality is improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of the present electrodeposition coating apparatus.

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

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrodeposition coating apparatus 2 electrodeposition coating liquid 3 electrodeposition tank 4 electrode member 15 mesh member W workpiece

Claims (3)

(57) [Claims] 1. An electrodeposition method wherein an object to be coated immersed in an electrodeposition tank is used as one electrode, and an electrode member immersed in the electrodeposition tank in a bare state is electrodeposited as the other electrode. In the coating apparatus, the periphery of the naked electrode member may be covered with an electrode member.
With a gap by multiple support members that protrude radially from
An electrodeposition coating apparatus , wherein a surrounding mesh member is provided to prevent foreign substances deposited on the outer surface of the electrode member from flowing out of the mesh member to the outside. 2. The electrodeposition coating apparatus according to claim 1, wherein said net member is made of resin. 3. The electrodeposition coating apparatus according to claim 1, wherein the mesh of the mesh member is a mesh of 50 to 500 μm.