JPH067800Y2 - Multicolor electrostatic coating device color change cleaning device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a color change cleaning of a multicolor electrostatic coating device for performing multicolor coating by selectively supplying each color paint to an electrostatic coating machine having an atomizing head. Regarding the device.

[Prior Art] When performing multicolor coating, it is required to shorten the color change cleaning time as much as possible.

In order to meet this requirement, it is conceivable that a color change valve device for selectively supplying each color paint should be provided in the immediate vicinity of the electrostatic coating machine to shorten the dye tube connected between the two. Providing a bulky color changing valve device near the electrostatic coating machine is not preferable because an excessive load is applied to the reciprocator that reciprocates the coating machine.

Therefore, normally, high-pressure cleaning air and high-pressure cleaning solvent are alternately supplied from the cleaning valve provided in the color changing valve device, and the paint remaining in the long paint tube and the electrostatic coating machine is washed and removed at high speed, It is supposed to be discharged from the atomizing head of the electrostatic coating machine in a short time.

However, in this case, a large amount of paint or cleaning solvent is instantaneously jetted from the atomizing head of the electrostatic coating machine, and these are discharged from the shroud for collecting the drainage liquid which is arranged so as to surround the atomizing head. There was a problem in that it overflowed and scattered to the outside and markedly contaminated the peripheral equipment and the surface of the electrostatic coating machine.

In view of such circumstances, the applicant of the present invention has filed Japanese Patent Application Laid-Open No. 61-4
As shown in Japanese Patent No. 6271, two color change valve devices each having a color change valve of the same color paint are used, and a manifold connected to an electrostatic coating machine having an atomizing head through a short paint tube is used. An outflow path for feeding each color paint supplied from the first color change valve device and the second color change valve device to the coating machine, and high pressure cleaning air and high pressure cleaning solvent supplied from both color change valve devices, respectively. A first switching valve and a second switching valve for switching between the outflow passage for discharging to the drain tank and a cleaning valve for supplying low-pressure cleaning air and low-pressure cleaning solvent are provided in the manifold. A cleaning device was proposed.

According to this device, the low-pressure cleaning air and the low-pressure cleaning solvent supplied from the cleaning valve provided in the manifold cleans and removes the previous color paint remaining in the short paint tube and the electrostatic coating machine, and in parallel with this. Then, for example, the previous color paint remaining in the paint pipe connected between the first switching valve provided in the manifold and the first color changing valve device is supplied with high pressure from the color changing valve device. At the same time as cleaning and removing with cleaning air and high-pressure cleaning solvent and discharging to the drain tank, in the paint pipe connected between the second switching valve and the second color changing valve device provided in the manifold, By filling the next color paint supplied from the color change valve device, it is possible to significantly reduce the color change cleaning time from the end of coating of the previous color paint to the start of coating of the next color paint. At the time of A large amount of coating material from the atomizing head of the electrostatic apparatus machine is also prevented scatter it.

[Problems to be solved by the device]

However, when this device is put to practical use, some pre-colored paint remains in the manifold provided with the first switching valve and the second switching valve even after the color-change cleaning, and the next-colored paint is left behind. It turned out to be a mixture of colors.

Then, the residual color of the previous color paint is generated in the manifold because the cleaning air and the cleaning solvent supplied to the manifold are at a low pressure, so that they are attached to the paint outlet of each switching valve opening inside the manifold. It was found that the cause was that the paint that was present was not completely wiped off.

Therefore, the present invention has a technical object to prevent the color residue of the paint from being generated in the paint tube connecting the manifold or the manifold with the manifold.

[Means for Solving the Problems]

In order to solve this problem, the present invention relates to a manifold connected to an electrostatic sprayer having an atomizing head through a short paint tube from a first color change valve device and a second color change valve device. Switching the outflow path for supplying each color paint supplied to the coating machine and the outflow path for discharging the high-pressure cleaning air and the high-pressure cleaning solvent supplied from the color changing valve device to the drain tank, respectively. In the color change cleaning device of the multicolor electrostatic coating device, wherein the one switching valve and the second switching valve are provided, and the cleaning valve for supplying the cleaning air and the cleaning solvent is provided in the manifold, the cleaning valve is An outlet passage connected to a supply source of high-pressure cleaning air and a high-pressure cleaning solvent, for supplying each color paint supplied through the manifold to the paint tube to the coating machine, and the manifold. A high pressure cleaning air supplied from the inside of the chamber and a manifold provided with a third switching valve for switching the outflow passage for discharging the high pressure cleaning solvent to the drainage tank are provided. A cleaning valve for supplying the low-pressure cleaning solvent is provided, and the low-pressure cleaning solvent outlet of the cleaning valve is arranged to face the paint outlet of the third switching valve.

[Action]

According to the present invention, in the color change cleaning, the inside of the manifold provided with the first switching valve and the second switching valve is cleaned by the high pressure cleaning air and the high pressure cleaning solvent supplied from the cleaning valve provided in the manifold. As a result, the previous color paint adhering to the paint outlets of the switching valves is completely wiped off without causing any color residue.

Moreover, the pre-color paint that is washed and removed from the manifold is instantly discharged to the drain tank by the high pressure cleaning air and the high pressure cleaning solvent through the third switching valve provided in the manifold interposed in the paint tube. To be done.

In parallel with this, a low pressure cleaning solvent and low pressure cleaning air are supplied from a cleaning valve provided in the manifold into a manifold provided with a third switching valve, and remain in the manifold and the paint tube. The pre-colored paint is washed away and discharged from the atomizing head of the painting machine without splashing around.

Moreover, since the low-pressure cleaning solvent outlet of the cleaning valve that supplies the low-pressure cleaning solvent is arranged to face the paint outlet of the third switching valve, the previous color paint that adheres to the paint outlet is colored. It can be wiped completely so that there is no residue.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a flow sheet showing an example of a color change cleaning device according to the present invention, and FIG. 2 is a time chart showing its operation.

In the figure, 1 is an atomizing head of an electrostatic coating machine that is rotated at high speed by applying a high voltage, 2 is a first color changing valve device for selectively supplying paints of each color, high pressure cleaning air, and high pressure cleaning solvent, and 3 is The second color change valve device 4 for selectively supplying paint, high-pressure cleaning air, and high-pressure cleaning solvent of the same color as the color change valve device 2 is a manifold connected to the electrostatic coating machine via a short paint tube 5.

The manifold 4 has an outflow passage for feeding each color paint supplied from the color changing valve devices 2 and 3 through the paint pipes 6 and 7 to the electrostatic coating machine, and a high-pressure cleaning supplied through the paint pipes 6 and 7. A first switching valve 9 and a second switching valve 10 for switching an outflow passage for discharging air and high-pressure cleaning solvent to a drain tank 8 are provided, and cleaning air and cleaning solvent are supplied into the manifold 4. Cleaning valves 11 and 12 are provided, and the cleaning valves 11 and 12 are
Reference numerals 12 are connected to a high pressure cleaning air supply source and a high pressure cleaning solvent supply source, respectively.

In addition, dump valves 13 and 14 for opening and closing the outflow passages are connected to the outflow passages on the drain tank 8 side of the switching valves 9 and 10, respectively.

Further, the paint tube 5 has an outflow path for feeding each color paint supplied through the manifold 4 to the electrostatic coating machine,
A manifold 16 provided with a third switching valve 15 for switching between the high-pressure cleaning air supplied from the inside of the manifold 4 and the outflow passage for discharging the high-pressure cleaning solvent to the drainage tank 8.
Is installed.

The manifold 16 is provided with a cleaning valve 17 for supplying low-pressure cleaning air and a low-pressure cleaning solvent, and the low-pressure cleaning solvent outlet 18 of the cleaning valve 17 opening in the manifold 16 is connected to the third switching valve 15. It is arranged so as to face the paint outlet 19.

In addition, in the outflow passage of the switching valve 15 on the drain tank 8 side,
A dump valve 20 that opens and closes the outflow passage is connected.

Further, the cleaning valve 17 is a low pressure cleaning air supply valve 21.
Manifold 2 provided with a low pressure cleaning solvent supply valve 22
Connected to 3.

Further, the first color change valve device 2 and the second color change valve device 3 are provided with respective manifolds 24, color change valves CV _{1 to} CV ₁₃ connected to a supply source of each color paint, and high pressure cleaning air. A cleaning valve 25 connected to the supply source and a cleaning valve 26 connected to the supply source of the high-pressure cleaning solvent are provided.

The above is the configuration of the color change cleaning device shown in FIG. 1, and its operation will be described below with reference to the time chart shown in FIG.

For example, the color change valve C provided in the first color change valve device 2
When painting with the red paint supplied from V ₁ , both the first switching valve 9 provided in the manifold 4 and the third switching valve 15 provided in the manifold 16 are opened, and each dump valve All 13, 14 and 20 are closed.

Then, when the painting of the red paint is completed, the first switching valve 9 and the third switching valve 15 are closed, the dump valves 13 and 20 are opened, and the manifold of the first color changing valve device 2 is opened. Wash valves 25 and 26 provided at 24
The high-pressure cleaning air and the high-pressure cleaning solvent are alternately supplied from the cleaning valve 1 and the cleaning valve 1 provided in the manifold 4, respectively.
High pressure cleaning air and high pressure cleaning solvent are alternately supplied from 1 and 12, respectively.

As a result, the red paint remaining in the manifold 24 and the paint pipe 6 is instantaneously washed and removed and discharged to the drainage tank 8 through the first switching valve 9, and at the same time, in the manifold 4 and this. The red paint remaining in the paint tube 5 connected to the third switching valve 15 is also instantaneously washed and removed, and is discharged to the drain tank 8 through the third switching valve 15.

Further, as a result, the red paint adhering to the paint outlets 27, 28 of the first switching valve 9 and the second switching valve 10 opening in the manifold 4 is also supplied with high pressure from the cleaning valves 11 and 12. Completely wiped with cleaning air and high pressure cleaning solvent.

Further, at this time, the cleaning valve 17 provided in the manifold 16 is opened and the low pressure cleaning air supply valve 2
1 and the low pressure cleaning solvent supply valve 22 are alternately opened and closed,
The red paint remaining in the manifold 16 and in the very short paint tube 5 connected between the manifold 16 and the electrostatic coating machine is also promptly washed away and scattered from the atomizing head 1 of the electrostatic coating machine. It is discharged so that it does not exist.

The cleaning valve 17 has a low-pressure cleaning solvent outlet 18
Is a third switching valve 1 that opens in the manifold 16.
Since it is arranged so as to face the paint outlet 19 of No. 5, the red paint adhering to the paint outlet 19 can also be completely wiped off with a low-pressure cleaning solvent or the like.

Therefore, the color change cleaning time can be remarkably shortened, and at the same time, the previous color paint can be prevented from splashing from the atomizing head 1 of the electrostatic coating machine during the cleaning, and the changeover valves 9 and 10 can be prevented.
It is also possible to surely prevent the previous color paint attached to the respective paint outlets 27, 28 and 19 of 15 and 15 from being left behind and causing color mixing with the next color paint.

Further, while performing such color change cleaning, the color change valve CV ₂ provided in the second color change valve device 3 is opened, and the color change valve CV ₂ and the second change valve are opened. The paint pipe 7 connected to the paint pipe 10 is filled with a next-color paint, for example, white paint.

Then, the first color change valve device 2 and the first change valve 9
If the cleaning time between the manifold 4 and the third switching valve 15 is shorter than the cleaning time required between
The second switching valve 10 is immediately opened, and the valve 1
The third switching valve 1 in which the white paint filled up to 0 is further provided on the manifold 16 closest to the electrostatic coating machine 1
Fill up to 5.

As a result, the color change time from the end of the coating of the red paint, which is the previous color paint, to the start of the coating of the white paint, which is the next color paint, is significantly shortened.

The cleaning valve 17 is not limited to the one that supplies both the low-pressure cleaning air and the low-pressure cleaning solvent alternately, as long as it supplies at least the low-pressure cleaning solvent.
Apart from this, a cleaning valve for supplying only low pressure cleaning air may be provided in the manifold 16.

On the contrary, one valve may be used as the cleaning valves 11 and 12.

[Effect of device]

As described above, according to the present invention, the color change cleaning time of the multicolor electrostatic coating device is further shortened as compared with the conventional one, and the paint is largely scattered from the atomizing head of the electrostatic coating machine during cleaning. This also has a very excellent effect of completely eliminating the problem that the previous color paint remains in color after washing and mixes with the next color paint.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an example of a color change cleaning device according to the present invention, and FIG. 2 is a time chart showing its operation. Explanation of symbols 1 ... Atomizing head of electrostatic coating machine, 2 ... First color change valve device, 3 ... Second color change valve device, 4 ... Manifold, 5 ... Paint tube, 8 ... ... Drainage tank, 9 ... first switching valve, 10 ... second switching valve, 11 ...
Wash valve, 12 ... Wash valve, 15 ... Third switching valve, 16 ... Manifold, 17 ... Wash valve,
18 ... Low pressure cleaning solvent outlet, 19 ... Paint outlet.

Claims (1)

[Scope of utility model registration request] 1. A first color changing valve device (2) and a second color changing valve device (2) are attached to a manifold (4) connected to an electrostatic coating machine having an atomizing head (1) through a short paint tube (5). Outflow passages for feeding each color paint supplied from the color change valve device (3) to the coating machine, and high pressure cleaning air and high pressure cleaning solvent supplied from the color change valve devices (2) and (3). The first switching valve (9) and the second switching valve (10) for switching the outflow passage for discharging each of them to the drain tank (8) are provided, and the cleaning air and the cleaning air are provided in the manifold (4). Cleaning valve to supply solvent
In the color change cleaning device of a multicolor electrostatic coating device provided with (11) and (12), the cleaning valves (11) and (12) are connected to a supply source of high pressure cleaning air and high pressure cleaning solvent. Together with the paint tube (5), an outflow passage for feeding each color paint supplied through the manifold (4) to the coating machine, and high pressure cleaning air and high pressure cleaning supplied from the inside of the manifold (4). Manifold provided with a third switching valve (15) for switching the outflow passage for discharging the solvent to the drainage tank (8)
(16) is interposed, the manifold (16) is provided with a cleaning valve (17) for supplying low-pressure cleaning air and a low-pressure cleaning solvent, and the low-pressure cleaning solvent outlet (18) of the cleaning valve (17). Is arranged so as to face the paint outlet (19) of the third switching valve (15).