JPS5852289Y2 - Electrodeposition coating equipment - Google Patents

Description

[Detailed explanation of the idea] TECHNICAL FIELD The present invention relates to improvements in electrocoating equipment.

If the electrodeposition coating liquid used for electrodeposition coating is not constantly circulated during use, the paint in the electrodeposition coating liquid will precipitate, making it impossible to perform a good coating.

In addition, the temperature of the paint in this electrodeposition coating liquid is above a predetermined temperature (
If the temperature rises above 35°C (usually 35°C or higher), the quality will deteriorate, so the electrodeposition coating liquid must always be cooled to a predetermined temperature or below.

Electrodeposition coating apparatuses have been proposed in the past to deal with this problem, but they have not yet been perfect.

The present invention is an attempt to provide an electrocoating apparatus with a simple structure that can always reliably circulate and cool the electrocoating liquid as described above by improving the conventional electrocoating apparatus. Examples thereof will be described below with reference to the drawings.

Figure 1 shows an electrodeposition coating device 1 that has been proposed in the past.
0 is shown, and this coating device 10 is equipped with an electrodeposition coating liquid S (
Main tank 11 that stores the coating liquid S (hereinafter simply referred to as coating liquid S)
A sub-tank 11a for storing the coating liquid S overflowing from the main tank 11, and a reserve tank 12 for temporarily storing the coating liquid S in the main and sub-tanks 11.11a.

Workpieces W to be painted are carried into the main tank 11 in a suspended state from a carry-in device, and a potential difference is created between the workpieces W and an electrode (not shown) in the main tank 11. By causing this, the paint in the coating liquid S is deposited on the surface of the object W to be coated.

The sub-tank 11a is for overflowing the coating liquid S in the main tank 11 and collecting bubbles, impurities, etc. floating on its surface.

Branch pipes 13 a and 13 b of the circulation pipe 13 are connected to the bottoms of the main and sub tanks 11 and 11 a, respectively, and the other end of the circulation pipe 13 opens into the main tank 11.

Furthermore, a circulation pump P1 and a temperature regulator 14 are interposed in this circulation pipe 13, and these circulation pumps P1
and the circulation pipe 1 located downstream of the temperature regulator 14
3 is connected to one end of a transfer pipe 15 that opens into the reserve tank 12 via a first switching valve 16.

Further, a feed pipe 17 that opens into the main tank 11 at one end is connected to the bottom of the reserve tank 12, and a feed pump P2 is interposed in the feed pipe 17.

In addition, the code|symbol 13C in the figure has shown the strainer.

Therefore, in this electrodeposition coating apparatus 10, if the circulation pump P1 is operated after the first switching valve 16 connects the upstream side and the downstream side of the circulation pipe 13, the inside of the main and sub tanks 11.11a is The coating liquid S is strainer 1.
3C to remove impurities, and the water is refluxed to the main tank 11 while being cooled by a temperature controller 14.

As a result, the coating liquid S is circulated without reaching a predetermined temperature or higher, and precipitation of the paint in the coating liquid S is prevented.

In addition, when the coating liquid S is circulated in this way and the above-described coating is repeated, dirt carried in with the object W to be coated, objects W to be coated that have fallen off from the carrying device, etc. are collected in the main and sub tanks 11.11a. They accumulate inside the body, so they need to be removed.

In this case, the first switching valve 16 is switched so that the circulation pipe 1
3 and the transfer pipe 15, the circulation pump P1 is operated, and the main and sub tanks 11.11
All of the coating liquid S in a is transferred to the reserve tank 12.

In this state, the main and sub tanks 11.11 a
After cleaning is completed, the feed pump P2 is operated to feed the coating liquid S in the preliminary tank 12 into the main tank 11.

By the way, during cleaning of the main and sub-tanks 11.11a, the coating liquid S transferred to the reserve tank 12 remains, even if only temporarily, and the paint in the coating liquid S settles.

Furthermore, since the reserve tank 12 is usually installed outdoors, the coating liquid S may be heated above the temperature at which the paint in it starts to react, especially in the summer. There is a problem in that the reserve tank 12 must be cooled with cold water, ice, or the like.

FIG. 2 shows an electrodeposition coating apparatus 100 according to the present invention, which is an improved version of the electrodeposition coating apparatus 10 described above. It is connected via the second switching valve 18 to a portion of the circulation pipe 13 upstream from the position where the circulation pump P1 and the temperature regulator 14 are disposed.

Thereby, the circulation pipe 13 is divided into an upstream section 13A, an intermediate section 13B in which a circulation pump P1, a strainer 13C, and a temperature regulator 14 are interposed, and a downstream section 13C from the upstream side by the switching valves 16 and 18.

In this case, the aforementioned feed pump P2 is removed from the feed pipe 17.

Note that the other configurations are the same as those of the electrodeposition coating apparatus 10 described above, so the same members are given the same reference numerals and the explanation thereof will be omitted.

Therefore, in the electrodeposition coating apparatus 100 configured as described above, if the circulation pump P1 is operated after the circulation pipe 13 is communicated with the first and second switching valves 16.18, the main and sub tanks 11.11a The coating liquid S inside is circulated to the main tank 11 while being cooled by a temperature controller 14.

Furthermore, in order to clean the inside of the main and sub-tanks 11.11a, the first switching valve 16 is switched to connect the intermediate portion 13B of the circulation pipe 13 and the transfer pipe 15, and the circulation pump P1 is operated. For example, the coating liquid S in the main and sub tanks 11.11a is controlled by the temperature controller 1.
4 and transferred into the reserve tank 12 while being cooled.

When this transfer is completed, by switching the second switching valve 18, the feeding pipe 17 is communicated only with the intermediate portion 13B of the circulation pipe 13, and the upstream portion 1 of the circulation pipe 13 is
Communication between 3A and intermediate portion 13B is cut off.

Thereby, the coating liquid S in the preliminary tank 12 is circulated through the supply pipe 17, the intermediate portion 13B of the circulation pipe 13, and the transfer pipe 15, and the coating liquid S is constantly cooled by the temperature regulator 14 during this circulation.

Furthermore, after the cleaning of both tanks 11, 11a is completed, by switching the first switching valve 16, the circulation pipe 1
If the intermediate and downstream portions 13B and 13C of 3 are communicated and the communication with the transfer pipe 15 is cut off, the coating liquid S in the reserve tank 12 is cooled by the temperature controller 14 and transferred to the main tank 11 by the circulation pump P1. will be transferred to.

Therefore, according to this electrodeposition coating apparatus 100, the coating liquid S is applied not only during the coating operation but also to the main and sub tanks 11.
11a can be constantly circulated by one pump P1 even when cleaning inside the coating liquid S, and the coating liquid S can be cooled by the temperature controller 14 during both circulation and transfer, so that the paint in the coating liquid S Precipitation and heat-induced changes can be completely prevented.

In summary, in the present invention, as exemplified in the above embodiment, the main tank 11 and the sub tank 11 a
A switching valve 18 is installed in a part of the circulation pipe located upstream of the circulation pump P1 and the temperature controller 14 that circulates the coating liquid S in the tank to the main tank 11. The feature lies in the fact that one end of the feed pipe 17 is connected, and this makes it possible to reliably circulate and cool the electrodeposition coating solution so that the paint does not settle or change.The electrodeposition coating device has a simple structure. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional electrodeposition coating apparatus, and FIG. 2 is a schematic diagram of an electrodeposition coating apparatus according to the present invention. Explanation of symbols 10... (conventional) electrodeposition coating device, 100... (according to the present invention) electrodeposition coating device,
11...Main tank, 11a...Sub tank, 12...Spare tank, 13...
... Circulation pipe, 14 ... Temperature controller, 15
...transfer pipe, 16... (first)
Switching valve, 17...Feeding pipe, 18...
・(Second) switching valve, Pl...Circulation pump, S
...Electrodeposition coating liquid, W...Object to be coated.

Claims (1)

[Scope of utility model registration request] A main tank that stores the electrodeposition coating liquid and paints the object to be coated, a sub-tank that stores the electrodeposition coating liquid that overflows from this main tank, and a temporary storage of the electrodeposition coating liquid in these main tanks and sub-tanks. a spare tank, a circulation pipe connected to the main tank and the sub-tank for circulating the electrocoating liquid in both tanks to the main tank, and a part of the circulation pipe downstream from the location where the circulation pump and cooling device are installed. a transfer pipe connected via a switching valve to transfer the electrocoating liquid in the main tank and the sub tank to the reserve tank; and a transfer pipe connected to the reserve tank to supply the electrocoat liquid in the reserve tank to the main tank. In the electrodeposition coating apparatus, one end of the feed pipe connected to the preliminary tank is connected to the circulation pipe upstream of the position where the circulation pump and the temperature controller are disposed through a switching valve. An electrodeposition coating device characterized by being connected to a part.