JPS5943897A - Electrodeposition painting device - Google Patents

Abstract

PURPOSE:To mix uniformly a specified amt. of a raw paint with a bath paint without changing the liquid level in an electrodeposition level, by mixing uniformly a specified amt. of the raw paint and a required amt. of the bath paint, and withdrawing a part of the bath paint in the electrodeposition cell then supplying the same into an auxiliary liquid cell through a circulation passage. CONSTITUTION:A specified amt. of the raw paint in a raw paint accepting tank 16 is withdrawn to the inside of a measuring tank 18. The raw paint in the tank 18 is surely and uniformly mixed with a required amt. of a bath paint in a mixing tank 21, whereafter the mixed paint is supplied into a replenishing tank 28 where the paint is reserved under stirring. A part of the bath paint in an electrodeposition cell 1 is withdrawn into the tank 21 in the stage of replenishing the paint; at the same time, the mixed paint for replenishing prepared beforehand in the tank 28 is supplied through a circulation passage into an auxiliary cell 3. The defective painting owing to foaming, etc. is prevented without uneven mixing of the replenishing paint in the cell 1 and without fluctuation in the liquid level in the cell 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodeposition coating apparatus for applying electrodeposition coating to an object to be coated.

In this type of electrodeposition coating apparatus, it is necessary to replenish a certain amount of base paint into the bath paint every time a required number of objects are coated. The important thing about this paint replenishment is to ensure that the bath paint in the electrodeposition tank and the replenishment paint are mixed evenly and to ensure the quantitative quality of the replenishment paint to maintain the bath paint concentration in order to obtain a good paint finish. It is about management.

In conventional electrodeposition coating equipment, pipeline mixers, propeller-type stirrers, etc. are used to replenish and mix -C raw paint, but Nonobu Brine Mixer is used when replenishing high viscosity raw paint. However, while propeller-type agitators are reliable in ensuring uniform mixing of the base paint and bath paint, they are not reliable in ensuring uniform mixing of the base paint and bath paint. It is necessary to move the liquid to the stirring tank, which may cause the liquid level in the electrodeposition tank to fluctuate, or there may be too much height difference between the liquid level in the main liquid tank and the liquid level in the secondary tank. Bath coating water flowing down from the liquid tank to the sub-liquid tank 1. This has the drawback that trapped bubbles are generated in the paint, which has an unfavorable effect on the coating.

The present invention was made in view of the above-mentioned FC, and an object of the present invention is to reliably and uniformly mix an accurate constant amount of base coating into the bath paint in order to coat the required number of objects to be coated. To provide a new electrodeposition coating apparatus which can automatically replenish paint into an electro-deposition tank without changing the liquid level in the first deposition tank.

According to the invention, therefore, the bath paint is stored)1. an electrodeposition tank which is integrated with a main liquid tank and a sub-liquid tank connected to the main liquid tank and into which bath paint flows from the main liquid tank; 1. A pump and an on-off valve are interposed to reach the sub-liquid tank. A paint circulation path connected to the replenishment paint receiving tank, a metering tank connected to the replenishment paint receiving tank via a pump and an on-off valve,
j5 a mixing tank having a blue agitator (connected via a pump and an on-off valve and connected to the paint circulation path via an on-off valve); An electrodeposition coating apparatus is provided, comprising a supply tank connected to a liquid tank via an H5 knob and an on-off valve, and having an agitator.

Hereinafter, based on the drawings, one example of the present invention M (711 (,
I will clarify.

FIG. 1 is a systematic explanatory diagram showing an electrodeposition coating apparatus according to the present invention. (1) in the figure shows the main liquid tank (-shi) and the sub-liquid tank (3).
) are integrally arranged in series, and the object to be coated (not shown) is immersed in the main liquid tank (2) in which bath paint is stored to perform electrodeposition coating. . The bath paint in the main liquid tank (2) overflows and flows into the sub liquid tank (3), and the bath paint in the sub liquid tank (3) is transferred to the pump (I7) and the strainer.
Or a paint circulation path (4) with a filter (2) installed.
), the bath paint is constantly circulated through the main liquid tank (2). Furthermore, the main liquid tank (2) and the sub-i tank (3)
A piping (7) is disposed between them via on-off valves (5) and (6), one or both of which are always open.

Note that % (8) and (9) are for the main liquid tank (2) and the sub-liquid tank (
3) Use the P-len valve to extract the bath paint inside.

0Q is between the on-off valves (5) and (6) of the piping (7) and the sub-liquid tank (
3), in the middle of which there is a pump (P6) and a normally open flow rate control throttle valve θ.
1), a normally open electromagnetic on-off valve (AV3), a wire mesh strainer, and a check valve (1, 1, etc.) are installed. (l is a throttle valve (1)) and a check valve 0■ This is a bath paint exchange pipe connected to the exchange tank (not shown) via a normally closed on-off valve oi'.

(tQ is the raw paint receiving tank, and the on-off valve (1°,
The raw paint is supplied and stored by a pump (Pl)f and an inlet pipe Q+. This receiving tank or S button,'
4V! The walls have a double structure, and hot water flows between them.
The raw paint in the tank is kept warm to prevent the raw material from dropping in temperature and increasing its viscosity.

0 is the receiving tank (mukara pump (P2), check valve (J
A metering tank connected by an inlet pipe Q2 having a throttle valve (E) and an electromagnetic on-off valve (AV7), and quantitatively regulated by a total upper limit switch (LS2) and a lower limit switch (LS3) for the amount of paint. ing.

Qo is a mixing tank, the bottom of which is connected to the bottom of the metered liquid tank 0 by a conduit Q1 having a pump (P5), a check valve (a), a throttle valve shaft and an electromagnetic on-off valve (person V4). Moreover, inside the tank is the circulation path (lO on-off valve (
(b) and the electromagnetic on-off valve (AV5) are connected by a supply pipe θ having a flow B, an adjusting throttle valve, and an electromagnetic on-off valve (AVl). Furthermore, inside the tank there is a stirrer (Mxl) having an impeller (c) that is rotationally driven by a motor shaft
) There is also a baffle plate 1/ on the top of the tank to prevent foaming.
7) are provided, and limit switches (LS4) (LS5) for detecting the upper and lower limits of the liquid level are provided.
．． ing. In addition, the piping connecting the receiving tank (2) and the measuring tank 0 square, and the measuring tank (7) and the mixing tank Q1) is formed into a double structure consisting of an inner pipe and an outer pipe. Hot water is passed between the tube and the tube to keep the raw paint flowing inside the tube warm.

(C) is a replenishment tank, and paint is introduced from the bottom of the mixing tank QO through an introduction pipe ■θQ that has a pump (P4), a check valve shaft, a throttle valve (to), and an electromagnetic on-off valve (Av6). . The supply tank has an agitator (MX2) and limit switches (LS6) (LS7) that detect the upper and lower limits of the liquid level, and the bottom of the tank is equipped with a pump (P5), a check valve 01), and an electromagnetic opening/closing switch. Valve (AV2)
The circulation path (10 pipes) is connected between the flow closing valve (AV3) and the strainer θ0 by a pipe ring having a pipe ring. Note that vIlr and the curved end of the flow closing valve (AV5) are connected between the electromagnetic on-off valve (AVl) and the mixing tank 01).

The above is an example of the configuration of the present invention.
The explanation will be given according to the jitance chart shown in the figure.

First of all, the usual state 1? In JI, the electromagnetic on-off valve (AV3) is opened and the electromagnetic on-off valve (AV 1 ) is closed, so the bath paint in the main liquid tank (2) and sub-liquid tank (3) is pumped (P6
) is circulated through the circulation path 01 into the sub-liquid tank (3) at a concentration of 1%.

In this state, when the number of objects to be coated passing through the electrodeposition tank (1) reaches a required number, for example, 50, a counter (
In response to the detection output (Sl) shown to the second national from the source (not shown), the electromagnetic on-off valve (AV3) is closed as shown in Fig. 2B, and the electromagnetic on-off valve (A, Vl) is closed as shown in Fig. 2B. It is opened and operated as shown in C, and the bath paint from the main liquid tank (2) and the sub-liquid tank (3) is supplied to the mixing tank 61>.

At the same time, as shown in K, second diagram, and E, the electromagnetic on-off valve (AV2) is opened and the pump (P5) is driven, and a certain amount of bath paint prepared in advance in the supply tank (A) is A uniformly stirred mixture of raw paint is supplied to the sub-liquid tank (3) through the circulation path 01.

Furthermore, as shown in Figure 2 F and G, an electromagnetic on-off valve (AV
7) is opened and the pump (P2) is driven.
The raw paint in the receiving tank (!IQ is supplied to the measuring tank ((2)).

Then, the upper limit switch (LS
When 2) turns ON as shown in the second drawing, this detection signal closes the electromagnetic on-off valve (AV7) and stops driving the pump (P2), stopping the supply of raw paint to the metering tank 0 frame. I'm going to do it.

After that, when the liquid level of the bath paint supplied into the mixing tank Q◇ reaches the upper limit switch (LS4) position, this limit switch (LS4) turns ON as shown in Figure 2 J, and the detection signal As shown in FIG. 2B and 0, the electromagnetic on-off valves (AV3) and (AVI) are opened and closed, respectively, and the main liquid tank (2) and (I-1:) sub-liquid tank (
The bath paint from 3) is again circulated via circulation path 01.

In addition, the detection signal of the limit switch (LS4) drives the stirrer (MXI) and pump (P3) as shown in L and MK in Figure 2, and opens the electromagnetic on-off valve (AV4). At the same time, as shown in Figure 2 N and OVC, the pump (P4) is driven and the electromagnetic on-off valve (A
V5) is opened, and the raw paint from the 0 fathom of the measuring tank is supplied into the mixing tank Q1) through the inlet pipe θQ and the electromagnetic on-off valve (AV5), and is stirred in the mixing tank QD (40 fathoms).
The raw paint and bath paint are uniformly stirred and mixed by the mixing tank QD, and the mixed paint in the mixing tank QD is circulated and supplied from the bottom of the p tank to the top by the pump (P4),
2) The mixing is performed evenly and reliably. The liquid level of the raw paint in the measuring tank is lower limit switch (LSD).
) position, this switch will move as shown in the second drawing.
When ON, the pump (P3) is stopped by this detection signal, and the current/flow closing valve (AV4) is operated to close, thereby stopping the supply of raw paint from the metering tank (to).

After that, the stirrer (MX) is activated by the time-up signal of the timer.
l) is stopped 11. At the same time, the electromagnetic on-off valve (AV5) is closed, and the stirring and mixing in the mixing tank e◇ is stopped.

At the same time, as shown in Figure 2P, an electromagnetic on-off valve (AV6
) is opened, and the mixed paint in the mixing tank QO is supplied to the supply tank (E). In this case, when the liquid level of the previously prepared mixed paint reaches the lower limit switch (LS7) in the replenishment tank (A), this switch is activated as shown in Figure 2.
As shown in K, the detection signal turns ON, and as shown in the second diagram and E, the flow closing valve (AV2) is closed and the pump (1) 5) is stopped, and the circulation path θ is closed.
When the supply of mixed paint to Q is stopped, 1i1.4=1・machine (MX2) is also stopped.

When the mixed paint liquid level in the mixing tank reaches the lower limit switch (LS5) position, it turns ON as shown in Figure 2, and from this detection signal the required delay time (in the mixing tank) Pump (P4) after the time required for all of the mixed paint in the tank to be supplied to the supply tank (P4)
At the same time, the electromagnetic on-off valve (Av6) is closed, and the supply of paint from the mixing tank (goods) to the supply tank (a) is stopped.

Also, when the liquid level of the mixed paint in the supply tank (c) reaches the upper limit IJ switch (LS 6) position, the second
As shown in Figure R, this detection signal turns on the supply tank control and the agitator (MX2) as shown in Figure 2 S.
is driven and waits until the next paint replenishment while stirring the mixed paint.

The above operation is repeated every time the object to be coated passes through the required number of electrodeposition baths (1).

As described above, according to the present invention, after a certain amount of raw paint weighed in advance in the cutting tank is thoroughly and uniformly mixed with the required amount of bath paint in the mixing tank, it is supplied to the supply tank. When the paint is replenished, part of the bath paint in the electrodeposition tank is drawn out and transferred to the mixing tank.71. At the same time, the pre-prepared replenishment mixed paint in the replenishment tank is supplied into the sub-liquid tank via the circulation path, so there is no uneven mixing of the replenishment paint in the 117 deposition tank, and the electric current is reduced. The liquid level in the deposition tank does not fluctuate and there is no significant difference in height between the main tank liquid level and the sub-tank liquid level, thus preventing coating defects due to liquid level fluctuations, bubble generation, etc. Also, since a certain amount of raw paint is accurately measured and automatically supplied, the concentration of bath paint in the electrodeposition tank can be controlled reliably and easily. It has a great effect.

In addition, if the mixing tank is configured to circulate and mix in addition to agitation as shown above, the raw paint and bath paint can be mixed more reliably 2).

[Brief explanation of drawings]

FIG. 1 is a systematic explanatory diagram showing one embodiment of the apparatus of the present invention, and FIG. 2 is a sequence chart for explaining its operation. (1)...electrodeposition tank, (2)...main liquid tank, (3)...
・Subliquid A1, C11...Circulation path, (PI) ~ (P6
)...pump, (AVl) −(AV7)−=
Solenoid on-off valve, ◇Q... raw paint receiving tank, ◇Mari...
Measuring tank, ■)...Mixing tank, (MXl) (MX
2)...Agitator, (a)...Replenishment tank.

Claims (1)

[Claims] An electrodeposition tank is integrated with a main liquid tank in which bath paint is stored and a sub-liquid tank connected to the main liquid tank and into which bath paint flows from the main liquid tank, and the main liquid tank and/or sub-liquid tank. a paint circulation path in which a pump and an on-off valve are interposed from the liquid tank to the sub-liquid tank;
a replenishment paint receiving tank; a metering tank connected to the replenishment paint receiving tank via a pump and an on-off valve; and a metering tank connected to the metering tank via a pump and an on-off valve and an on-off valve in the paint circulation path. a mixing tank having an agitator connected to the mixing tank through a pump and an on-off valve, and a replenishment tank having an agitator connected to the mixing tank through a pump and an on-off valve and connected to the sub-liquid tank through a pump and an on-off valve; An electrodeposition coating device comprising: