JP3022089B2 - Cleaning method for multicolor coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a method for cleaning a multicolor coating apparatus for cleaning and removing paint remaining in a paint pipe system from a color changing apparatus to a coating machine with air and a solvent.

[0002]

2. Description of the Related Art A multi-color coating apparatus used for automotive coating is a color changing apparatus in which a manifold provided with a plurality of color changing valves for selectively supplying each color paint is provided with a cleaning air supply valve and a cleaning solvent supply valve. When the color change from the previous color paint to the next color paint is performed, the operation of alternately opening and closing the cleaning air supply valve and the cleaning solvent supply valve of the color changing device for a predetermined time is repeated about 4 to 5 times. The high-pressure air and the high-pressure solvent alternately supplied from these valves are used to wash and remove the pre-color paint remaining in the paint pipe system from the manifold of the color changing device to the coating machine ( JP-A-61-37258).

[0003]

The reason why the inside of the paint pipe system is cleaned with high-pressure air and a high-pressure solvent is to perform reliable and quick cleaning and to shorten the color change time of the paint. However, since the color change is performed frequently, the consumption of the solvent becomes enormous, the waste liquid treatment load for preventing pollution increases, and there is a problem that the running cost is remarkably increased. Accordingly, it is a technical object of the present invention to reduce the consumption of a solvent used for cleaning a multicolor coating apparatus without impairing the cleaning effect.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a system for a paint piping system which is connected to a coating machine from a color changing device having a plurality of color changing valves for selectively supplying each color paint. In a method for cleaning a multicolor coating apparatus in which a cleaning air and a cleaning solvent are alternately supplied a predetermined number of times into a passage to wash and remove the paint remaining in the passage, the washing is alternately supplied into the passage. It is characterized in that each supply cycle is gradually shortened as the number of supply times of the cleaning air and the cleaning solvent increases.

[0005]

According to the present invention, since the supply time of the cleaning solvent to be supplied a predetermined number of times into the paint pipe system becomes shorter each time, the supply number and the initial supply time become shorter. If it is the same as before, the consumption of the cleaning solvent will be greatly reduced compared to the conventional case. Further, in the paint pipe system, the amount of the remaining paint decreases as the number of times of supply of the cleaning air and the cleaning solvent increases, so that even if the supply amount of the cleaning solvent is gradually reduced, the cleaning effect is impaired. It is not. Also, if the supply amount of the cleaning solvent gradually decreases each time,
Even if the supply cycle of the cleaning air for discharging the cleaning solvent to the outside of the paint piping system is gradually shortened, and the supply amount gradually decreases with each turn, the cleaning effect does not decrease. Furthermore, if the supply cycle of the cleaning air and the cleaning solvent is gradually shortened as described above, the cleaning time is greatly reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a flow sheet diagram showing an example of the configuration of a multicolor coating apparatus to which the method of the present invention is applied, and FIG. 2 is a time chart showing an example of the method of the present invention.

[0007] multicolor coating apparatus shown in Figure 1, a paint of a multiple selection supplies color change valve CV of each color, and an air supply valve AV ₁ cleaning supplies high-pressure air, solvent cleaning supplies high pressure solvent A paint pipe system 3 connected to the coating machine 2 from the inside of the manifold M of the color changing device 1 having the supply valve SV ₁ is provided by a valve unit 4 interposed in the system 3 near the coating machine 2. Cleaning is performed by dividing into two paths 3a and 3b. That is, the valve unit 4
The long system 3a from the color changing device 1 to the vicinity of the coating machine 2 is connected to the short system 3b from the vicinity of the coating machine to the coating machine 2 and the drainage system 5 to the waste liquid tank 8. a trigger valve 6 for switching and connecting, the cleaning air supply valve AV ₂ and cleaning solvent supply valve SV ₂ supplies low pressure air and a low pressure solvent for sprayer cleaning system path 3b, system channel drainage pipe system And a drain valve 7 for opening and closing the drain line 5. In cleaning, the trigger valve 6 divides the system line 3 of the paint piping system into two systems 3a and 3b, and connects the system line 3a to the drainage system. The paint connected to the system 5 and remaining in the system 3a is
And alternately washed away with high-pressure air and high pressure solvent a predetermined number of times supplied cleaning air supply valve AV ₁ of color change device 1 from the cleaning solvent supply valve SV _1, remaining within the coating machine 2 system path 3b coating is adapted to wash removed at low pressure air and the low pressure solvent a predetermined number of times alternately supplying the cleaning air supply valve AV ₂ from the cleaning solvent supply valve SV _2.

The cleaning air supply valve AV ₁ and the cleaning solvent supply valve SV _1, and the cleaning air supply valve AV ₂ and the cleaning solvent supply valve SV ₂ , as shown in FIG. The opening and closing control is performed so that the supply time is gradually shortened each time as the process proceeds, and the supply cycle is gradually shortened. The cleaning air supply valve A
V ₁ and AV ₂ is only as long as the last round, the solvent adhering to the system path 3a and the 3b of the coating piping system it is necessary to supply the air for a certain time until complete evaporation, the exception only that time To lengthen the supply cycle.

[0009] Thus, the supply frequency of the high-pressure air and high pressure solvent is supplied alternately from the cleaning air supply valve AV ₁ and the cleaning solvent supply valve SV ₁ of color change device 1 in the system path 3a of the coating piping system If the supply time is the same as the conventional one and the supply time per one time is set to the same time as the conventional one only for the first time only, the supply cycle of the high-pressure air and the high-pressure solvent is gradually reduced, so that the respective total supply time Is significantly shortened compared to the prior art, and the cleaning time is correspondingly shortened, and at the same time, the consumption of the solvent is significantly reduced. The effect of reducing the solvent consumption according to the present invention is sufficient only by gradually shortening the supply cycle of the high-pressure air and the high-pressure solvent, as described above. In addition, the cleaning air supply valve AV _{2 of the} valve unit 4 is sufficient. if progressively reduced each time a supply cycle of the low-pressure air and the low pressure solvent is supplied alternately from cleaning solvent supply valve SV ₂ the system path 3b paint pipeline also follow times, consumption of solvent is further reduced and You.

Regarding the cleaning effect, the residual paint in the paint piping systems 3a and 3b gradually decreases as the number of times of supply of air and solvent increases, so that the solvent supply cycle is gradually shortened, and Even if the solvent supply amount gradually decreases, there is no possibility that the cleaning effect is impaired. Further, if the supply amount of the solvent decreases, the supply amount of the air for discharging the solvent to the outside of the system is correspondingly small. Therefore, there is no problem even if the supply amount of the air is gradually reduced.

[0011]

According to the present invention, the consumption of the solvent used for cleaning and removing the paint remaining in the paint piping system of the multicolor coating apparatus is greatly reduced as compared with the conventional one, and low pollution and resource saving are achieved. At the same time, there is an extremely excellent effect that the washing time is shortened and the color can be changed quickly.

[Brief description of the drawings]

FIG. 1 is a flow sheet diagram showing an example of a configuration of a multicolor coating apparatus.

FIG. 2 is a time chart showing an example of the method of the present invention.

[Explanation of symbols]

1 ... color change device 2 ... coating machine 3 ... paint pipeline system path CV ... color change valve AV ₁ ... wash air supply valve SV ₁ ... cleaning solvent supply valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B05D 1/04 B05B 12/14 B05B 15/02 B05D 1/06

Claims (1)

(57) [Claims] 1. A cleaning system in a paint pipe system (3) which is connected to a coating machine (2) from a color change device (1) having a plurality of color change valves (CV) for selectively supplying paints of respective colors. In a method of cleaning a multicolor coating apparatus in which air and a cleaning solvent are alternately supplied a predetermined number of times to wash and remove the paint remaining in the system (3), the air and the solvent are alternately supplied into the system (3). A method for cleaning a multicolor coating apparatus, wherein each supply cycle is gradually shortened as the number of times of supply of the cleaning air and the cleaning solvent increases.