JPS63119872A - Coater - Google Patents

Abstract

PURPOSE:To improve the efficiency of a cleaning operation by making prepn. for coating of the other color in the section from the other color change valve unit to a selector unit during coating and making cleaning of only the spraying guns and between the selector unit and cleaning valve unit at the time of a color change. CONSTITUTION:The color change valve units 3A, 3B are connected to plural paint supply paths 4a-4c, a paint solvent supply path 5 and an air supply path 6. The cleaning valve units 9A, 9B are connected to the outlet parts of the above-mentioned respective color change value unit and are connected to the supply paths 5, 6. Further, the selector unit 12 which selects the circuit for communicating one of the outlet parts of the respective color change valve units to the spray gun 1 and communicating the other to the discharge side and the circuit for communicating one of the outlets of the respective cleaning valve units to said discharge side and communicating the other to the spray gun is provided. The cleaning valve units 9A, 9B and the selector unit 12 are respectively disposed near the spray gun 1. As a result, the efficiency of the operation for cleaning the spray gun, etc., is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating device that performs painting by switching between multiple paint colors and injecting them from a spray gun. The present invention relates to a coating device that improves the efficiency of cleaning operations such as the following:

[Prior Art] Conventionally, there is a coating device as shown in FIG. 4, which is equipped with a plurality of colors of paint and performs painting with each paint. In other words, a spray gun (paint gun) that sprays paint onto a painted surface.
1 is provided, and this spray gun 1 is connected to a color change valve unit (color change valve: a common air pilot operated valve for turning on/off paint, a 2-port 2-position valve) via a paint hose 2. 3 is connected.

This color change valve unit 3 has seven valve parts 3a to 3g, and each valve part 3a to 3g is provided with a plurality of paint supply paths 4a to 4e (in this case, five colors of A to E).

The paint solvent supply path 5 and the air supply path 6 are connected to each other, and the air 5 is supplied from these supply paths 4a to 4e, 5 and 6.
Either the color paint, paint solvent or air is selectively switched by the color change valve unit 3, and the paint hose 2
The spray gun 1 is supplied from the spray gun 1.

Further, solenoid valves 7a to 7g are also connected to each of the valve parts 3a to 3g of the color change valve unit 3, and by turning on each solenoid valve 7a to 7g, the respective valve parts 3a to 3g are connected to each other through the solenoid valves 7a to 7g. Pilot air is supplied to the corresponding valve parts 3a to 3g, and each supply path 4a to 4e, 5 or 6 and the hose 2 on the outlet side of the color change valve unit 3 (i.e., the spray gun 1)
It is now possible to communicate with each other. In addition, the solenoid valves 7a~
When the solenoid valves 7g are off, the valve parts 3a to 3g are in a non-communicating state as shown in FIG. 5(a), and when the solenoid valves 7a to 7g are on, the valve parts 3a to 3g are in a non-communicating state as shown in FIG. 5(b). They are in a state of communication. And in Figure 4.

A case is shown in which the electromagnetic valve 7a is in the on state and the paint supply path 4a and the paint hose 2 are in communication.

Furthermore, a solenoid valve 8 is connected to the spray gun 1, and by turning on this solenoid valve 8, pilot air is supplied to the spray gun 1 through the solenoid valve 8, and from the spray gun 1, a paint hose is supplied. Any of the paint, paint solvent, and air supplied through the color change valve unit 2 and the color change valve unit 3 is discharged. However, in Figure 4,
A state in which the paint of color A supplied from the paint supply path 4a is being discharged is shown.

In such conventional painting equipment, when changing colors,
For example, when the solenoid valve 7a is turned on and the paint of color A is supplied from the paint supply path 4a to the spray channel 1 for painting (time interval T in FIG. 6), the solenoid valve 7b is turned on. When switching to the on state and supplying color B paint from the paint supply path 4b, first, all the solenoid valves 7a to 7g and 8 are turned off, and then the solenoid valves are turned off for one color change time interval T2. 8 is turned on and the spray gun 1 is kept in a discharge state.

In this state, as shown in FIG. 6, the solenoid valves 7g and 7f are turned on and off alternately. When the solenoid valve 7g is first turned on, the paint of color A in the paint hose 2 and the spray gun 1 is pushed out by high pressure air from the air supply path 6.

After that, the solenoid valve 7f is turned on instead of the solenoid valve 7g, and the interior of the paint hose 2 and spray gun 1 is cleaned with the paint solvent from the paint solvent supply path 5, and then the solenoid valve 7g is turned on again. The paint solvent in the paint hose 2 and spray gun 1 is pushed out and dried by high-pressure air from the air supply path 6. Then, the same operation is repeated once again to clean the interior of the paint hose 2 and spray gun 1, and to extrude and dry the paint solvent.

Next, the solenoid valve 7b is turned on, and the paint of color B is filled from the paint supply path 4b through the color change valve unit 3 into the paint hose 2 and spray gun 1, and then the solenoid valve 8 is turned off. So, is it painted with B color paint? Pi preparation or color change work is completed.

In this state, by turning on/off the electromagnetic valve 8, paint of color B is discharged from the spray gun 1, and painting with the paint of color B is performed.

[Problems to be Solved by the Invention] However, in the conventional painting apparatus as described above, when changing colors, the paint hose 2 and spray gun 1 over the entire length Ω are alternately filled with paint solvent and air for cleaning and drying. After that, the color change time interval T2 is set in order to fill the inside of these paint hoses 2 and spray guns 1 with the next paint.
depends on the distance from the color change valve unit 3 to the spray gun 1, that is, the total length Ω of the paint hose 2. That is, the color change time interval T2 is determined by the passage resistance of the paint solvent in the vehicle hose 2 of length Q and the spray gun 1 (however, the paint supply pressure, hose size, air pressure, paint solvent (assuming conditions such as pressure and temperature are the same).

Therefore, like a painting robot, a spray gun 1 is provided at the tip of its arm, and paint, paint solvent, or air is supplied to this spray gun L from a color change valve unit 3 via a paint hose 2 of considerable length. In this case, there is a problem that the color change time interval T2 becomes extremely long.

The present invention has been made to solve the above-mentioned problems, and aims to improve the efficiency of cleaning work of spray guns, etc. when changing colors to change the type of paint, and to significantly shorten the time required to change colors. The purpose of the present invention is to provide a coating device with

[Means for Solving the Problems] Therefore, the coating apparatus of the present invention can control which of the plurality of paints, paint solvents, and air supplied from the plurality of paint supply paths, paint solvent supply paths, and air supply paths. It is equipped with two sets of color change valve units that selectively switch and discharge the color change valve units, and is connected to the outlet of each color change valve unit to discharge any of the above paint, paint solvent, and air from the same outlet. In addition, two sets of cleaning valve units connected to the paint solvent supply path and the air supply path and capable of selectively discharging the paint solvent and air supplied from these supply paths are provided, and the outlet portion of each of the cleaning valve units described above is provided. A switching unit that switches between a circuit that communicates one of the outlets with the spray gun and the other with the discharge side, and a circuit that communicates one of the outlet sections of each of the cleaning valve units with the discharge side and the other with the spray gun. The spray gun is characterized in that the cleaning valve unit and the switching unit are each disposed near the spray gun.

[Function] In the above-described painting apparatus of the present invention, when changing colors, paint is supplied from the paint supply path to the spray gun through one color change valve unit, the - side cleaning valve unit, and the switching unit. In this state, the other color change valve unit and the other cleaning valve unit are communicated with each other, and the paint solvent and air are alternately switched and discharged from the other color change valve unit, and the paint solvent and air are By discharging from the other cleaning valve unit to the discharge side via the switching unit, cleaning from the other color changing valve unit to the switching unit is performed.

When the supply of paint to the spray gun through the one color change valve unit, the - side cleaning valve unit, and the switching unit is completed, paint solvent and air are alternately supplied from the one cleaning valve unit. By discharging the paint solvent and air from the switching unit through the spray gun, cleaning from the switching unit to the spray gun is performed.

Thereafter, by switching the circuit in the switching unit, paint of a different color is supplied to the spray gun through the other color switching valve unit, the other cleaning valve unit, and the switching unit.

[Embodiments of the Invention] A coating apparatus as an embodiment of the present invention will be explained below with reference to the drawings. Fig. 1 is a configuration diagram thereof, Fig. 2 is a timing chart for explaining its operation, and Fig. 3 is a diagram showing its configuration. FIG. 3 is a schematic side view showing an example of how the present device is attached to a painting robot.

As shown in Fig. 1, in the coating apparatus of this embodiment,
Two sets of first color change valve unit 3A and second color change valve unit 3
B is provided.

Each color changing valve unit 3A, 3B is configured with seven valve parts 3a to 3g, as in the conventional case, and each valve part 3a to 3g has a plurality of (here, five colors of A to E colors). Paint supply path 4a
~4e, paint solvent supply path 5 and air supply path 6 are connected, and any of the five color paints, paint solvent, and air supplied from these supply paths 4a to 4e, 5, and 6,
The color changing valve units 3A and 3B selectively switch the colors and discharge from the respective outlet portions.

Furthermore, electromagnetic valves 7a to 7g are connected to each of the valve parts 3a to 3g of the first color changing valve unit 3A.

The solenoid valves 17a to 17g are also connected to each valve part 3a to 3g of the second color changing valve unit 3B, and each solenoid valve 7a to
By turning on the solenoid valves 7a to 7g and 17a to 17g, the corresponding color change valve units 3A are turned on.

Pilot air is supplied to each valve part 3a-3g of 3B, and each supply path 4a-4e, 5, or 6 and the outlet part of color change valve unit 3A, 3B are connected.

In FIG. 1, the electromagnetic valves 7a and 17b are in the ON state, and the outlet part of the first color change valve unit 3A is in communication with the paint supply path 4a, and the outlet part of the first color change valve unit 3A is in communication with the paint supply path 4a. A case is shown in which the outlet portion and the paint supply path 4b are in communication.

On the other hand, two sets of a first cleaning valve unit 9A and a second cleaning valve unit 9B are connected to the outlet portions of the color change valve units 3A and 3B via paint hoses 2a and 2b, respectively.

Each cleaning valve unit 9A, 9B has three valve parts 98 to 9c.
The valve portion 9a of the first cleaning valve unit 9A
The paint hose 2a from the first color changing valve unit 3A is connected to the valve part 9a of the second cleaning valve unit 9B.
A paint hose 2b from the second color change valve unit 3B is connected to. Further, a paint solvent supply path 5 and an air supply path 6 are connected to the valve portions 9b and 9c of each cleaning valve unit 9A, 9B, respectively.

Then, the first cleaning valve unit 9A removes any of the paint, paint solvent, and air from the outlet of the first color change valve unit 3A, the paint solvent from the paint solvent supply path 5, and the air from the air supply path 6. Toga.

In addition to being selectively switched and discharged from the outlet of the first cleaning valve unit 9A, the second cleaning valve unit 9B also discharges paint from the outlet of the second color changing valve unit 3B. Either the solvent or the air, the paint solvent from the paint solvent supply path 5, and the air from the air supply path 6 are selectively switched so that they are discharged from the outlet of the second cleaning valve unit 9B. It has become.

Further, solenoid valves 10a to 10c are connected to each of the valve parts 9a to 9c of the first cleaning valve unit 9A, and solenoid valves 11a to 11a to 10c are connected to each of the valve parts 9a to 9c of the second cleaning valve unit 9B.
LLC is connected, and each solenoid valve 10a to 10c, l
By turning on the solenoid valves 10a-10c, t11a-llc, the valve portions 9a-9c of the corresponding color change valve units 9A, 9B are turned on.
Pilot air is supplied to the paint hose 2a or 2b.

Either the paint solvent supply path 5 or the air supply path 6 communicates with the outlet portions of the cleaning valve units 9A, 9B.

In FIG. 1, the solenoid valves 10a and 11a are in the ON state, and the outlet portion of the first cleaning valve unit 9A communicates with the paint hose 2a, and the outlet portion of the second cleaning valve unit 9B communicates with the paint hose 2a. A case is shown in which the paint hose 2b is in communication.

Further, a spray gun (paint gun) 1 for spraying paint onto a painted surface is provided, and in this embodiment, cleaning valve units 9A and 9B are disposed near this spray gun 1, and these cleaning valves A switching unit 12 is arranged between the units 9A, 9B and the spray gun 1.

The switching unit 12 has paint hoses 2c and 2 on the population side.
The outlet portions of the cleaning valve units 9A and 9B are connected to each other via d, while the outlet side of the switching unit 12 is connected to the spray gun 1 as a discharge side via a paint hose 2e and a discharge hose 2f. tanks 16 are connected to each other.

This switching unit 12 includes a circuit 12 that connects the outlet of the first cleaning valve unit 9A to the spray gun 1 and connects the outlet of the second cleaning valve unit 9B to the tank 16.
a, and a circuit 12b that communicates the outlet of the first cleaning valve unit 9A with the tank 16 and the outlet of the second cleaning valve unit 9B with the spray gun 1.
2a.

12b is switched by receiving pilot air from a solenoid valve 13 connected to the switching unit 12.

That is, when the solenoid valve 13 is in the OFF state (the state shown in FIG. 1), the paint hose 2c,
2d is connected to the spray gun 1 and the tank 16 by the circuit 12a, and when the solenoid valve 13 is in the ON state, the switching unit 12 switches the circuit 1 from the circuit 12a by supplying pilot air.
2b, the paint hoses 2c and 2d are connected to the tank 16 and the spray gun 1, respectively.

As in the past, a solenoid valve 8 is connected to the spray gun l, and by turning on the solenoid valve 8, pilot air is supplied to the spray gun 1 through the solenoid valve 8, and the paint is Either the paint, paint solvent, or air from the hose 2e is discharged from the spray gun i. However, in FIG. 1, the solenoid valve 8 is in the ON state, and the paint of color A from the first color changing valve unit 3A is transferred to the paint hose 2a and the first cleaning valve unit 9A.

Paint hose 2c, switching unit 12 and paint hose 2
A state in which spray gun 1 is discharging through e is shown.

Further, a switching valve 14 is interposed in the discharge hose 2f, and this switching valve 14 allows communication between the switching unit 12 and the tank 16 when the solenoid valve IS is in the on state (as shown in FIG. 1). condition).

Since the coating apparatus as an embodiment of the present invention is configured as described above, for example, as shown in FIG.
A state in which paint of color A is supplied from the paint supply path 4a to the spray gun 1 through the first cleaning valve unit 9A and the circuit 12a of the switching unit 12, and painting is performed while turning on and off the solenoid valve 8 (second Time interval T1 in the figure)
When switching from supplying paint of color B to the spray gun 1, the following color change operation is performed.

First, as shown in FIG. 2, the electromagnetic valve 11
a, 15 are turned on, and the second color change valve unit 3B, second cleaning valve unit 9B, and tank 16 are connected in communication via the paint hoses 2b, 2d, the circuit 12a in the changeover unit 12, and the discharge hose 2f. .

In this state, as shown in FIG. 2, the solenoid valves 17g and 17f are turned on and off alternately. First solenoid valve 17
When g is turned on, high-pressure air from the air supply path 6 causes the paint hose 2b.

2d (this paint is applied to the spray gun 1 from the second color change valve unit 3B before painting with the color A paint).
This is the paint that was supplied to. ) is pushed out into tank 16.

After this, the solenoid valve 17f is turned on instead of the solenoid valve 17g, and the paint solvent from the paint solvent supply path 5 is supplied to the paint hose 2.
After cleaning inside the paint hoses 2b and 2d, the solenoid valve 17g is turned on again and the paint solvent in the paint hoses 2b and 2d is pushed out to the tank 16 with high pressure air from the air supply path 6 and dried. Then, the same operation is repeated once again to clean the insides of the paint hoses 2b and 2e, and to extrude and dry the paint solvent.

Next, the solenoid valve 17b is turned on, and the paint supply path 4b is turned on.
from the paint hoses 2b, 2 via the second color change valve unit 3B.
d is filled with B color paint, and when this B color paint flows out from the discharge hose 2f to the tank 16, the solenoid valve 1
5 back to the off state.

As a result, during the painting period with the paint of color A from the first color changing valve unit 3A (time interval T L in FIG. 2)
Then, preparation for painting with B color paint is completed between the second color change valve unit 3B and the changeover unit 12.

Next, the spray gun 1 is connected to the male one-color switching valve unit 3A, the first cleaning valve unit 9A, and the switching unit 12.
When the paint supply to the solenoid valve 7a (that is, painting with the A color paint from the first color change valve unit 3A) is completed, the solenoid valve 7a
, 10a are turned off, and the first color change valve unit 3A and the first cleaning valve unit 9A are brought into a new state.

In this state, during the color change time interval T2, the solenoid valve 8 is turned on to put the spray gun 1 in a discharge state, and the solenoid valves 10c and 10b are alternately turned on and off.

When the solenoid valve 10c is first turned on, the air supply path 6
The paint hose 2c, the circuit 12a of the switching unit 12, the paint hose 2e, and the color A paint in the spray gun 1 are discharged through the spray gun 1 by high pressure air from the spray gun 1.

After that, the solenoid valve 10b is turned on instead of the solenoid valve 10c, and the paint solvent from the paint solvent supply path 5 is applied to the paint hose 2c and the circuit 12a of the switching unit 12.

After cleaning the paint hose 2e and the inside of the spray gun 1, turn on the solenoid valve 10c again, and use high-pressure air from the air supply path 6 to clean the paint hose 2c, the circuit 12a of the switching unit 12, the paint hose 2e, and The paint solvent in the spray gun 1 is discharged through the spray gun 1 and dried. Then, repeat the same operation once again to remove the paint hose 2c, the circuit 12a of the switching unit 12,
The interior of the paint hose 2e and spray gun 1 is cleaned, and the paint solvent is extruded and dried.

Next, the solenoid valve 13 is turned on, and the switching unit 12
After switching from the circuit 12a to the circuit 12b, the paint of color B is filled from the paint hose 2d into the paint hose 2e and the spray gun 1, and the time when this color B of paint flows out from the spray gun 1. By returning the solenoid valve 8 to the OFF state.

Preparation for painting with color B, ie, color change work, is all completed.

In this state, by turning on/off the solenoid valve 8,
The B color paint supplied from the second color changing valve unit 3B is
The paint is discharged from the spray gun 1 and the B color paint is applied.

In addition, during the painting period with this B color paint.

In the same manner as described above, preparation for painting with paint of another color is performed between the first color switching valve unit 3A and the switching unit 12.

In addition, solenoid valves 7b to 7g not shown in FIG.
llb, llc, 17a, 17c to 17g are always in an OFF state during the above-mentioned color change operation from A color paint to B color paint.

As described above, according to this embodiment, when changing one color, the first
During the painting period with the color A paint from the color change valve unit 3A, preparations for painting with the color B paint are being made between the second color change valve unit 3B and the switching unit 12, so in reality.

When changing the color from A color paint to B color paint, as shown in the color change time interval T2 part of FIG. between the paint hose 2c and the circuit 12 of the switching unit 12.
a. The interior of the paint hose 2e and spray gun 1 may be cleaned, and the paint solvent may be extruded and dried.

Therefore, as shown in FIG. 3, even if the spray gun 1 is provided at the tip of the arm 20 of the painting robot R and the distance between the spray gun 1 and the color change valve units 3A and 3B becomes large, By arranging the switching unit 12 and the cleaning valve units 9A and 9B near the spray gun 1, the cleaning work of the spray gun 1, etc. is made more efficient, and the color change time interval T2 is much shorter than before. It can be done.

For example, from the color change valve units 3A and 3B to the spray gun 1.
Although it depends on the circuit length (Q) in the case of the conventional device, with the conventional device, it takes about 10 seconds to clean the inside of the painting hose 2 and spray gun 1, and about 8 seconds to fill the next color (color B), in total. Whereas the color change time interval T2 required approximately 18 seconds, in the apparatus of this embodiment, the paint hose 2c and the circuit 12a of the switching unit 12.

Approximately 5 seconds for cleaning the paint hose 2e and spray gun 1, approximately 5 seconds for filling the next color (B color)1 Total color change time interval T2
This will take about 10 seconds.

In addition, in the above example, only an example of color change from color A paint to color B paint is explained, but when changing the color from any of A to E colors to other paints, the same procedure as described above is performed. It is carried out as follows.

Further, in the above embodiment, the types of paints are five colors, but the present invention is not limited to this, and by changing the number of valve parts in the color changing valve units 3A and 3B according to the number of paints. The apparatus described above can also be applied to a coating apparatus having multiple colors of paint in the same manner as described above. In particular, when there are many types of paint (for example, 20 to 30 colors) and one device is applied to a painting robot R as shown in FIG. Keep it fixed.

[Effects of the Invention] As detailed above, according to the coating apparatus of the present invention, during color change, during the painting period with paint from one color change valve unit, the paint from the other color change valve unit to the switching unit is During the process, preparations for painting with paint of another color are made, and when changing the actual color, all that is required is cleaning between the spray gun and the switching unit and cleaning valve unit near the spray gun. Even when the distance from the color change valve unit becomes large, cleaning work of spray guns, etc. can be made more efficient, and the time interval between color changes can be much shorter than in the past.

[Brief explanation of the drawing]

Figures 1 to 3 show a coating device as an embodiment of the present invention. Figure 1 is its configuration diagram, Figure 2 is a timing chart for explaining its operation, and Figure 3 is a diagram of the equipment. FIG. 4 is a schematic side view showing an example of attachment to a painting robot;
Figures 6 to 6 show a conventional coating device, Figure 4 is its configuration diagram, and Figures 5 (a) and (b) are schematic diagrams showing the communicating/non-communicating states of the valve parts in the color change valve unit, respectively. 6 are timing charts for explaining the operation. In the figure, 1-spray gun, 3A-first color change valve unit, 3B-second color change valve unit, 4a to 4e-paint supply path, 5-paint solvent supply path, 6-air supply path, 9A-second color change valve unit, 1 cleaning valve unit, 9B-2nd cleaning valve unit, 12-
Switching unit, 12a. 12b - circuit, 16 - tank as discharge side; In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a coating device that can switch between multiple colors of paint and supply them from a spray gun, the paints and paint solvents of multiple colors are connected to multiple paint supply channels, paint solvent supply channels, and air supply channels, and are supplied from these supply channels. It is equipped with two sets of color change valve units that selectively switch and discharge either of the color change valve units and air, and is connected to the outlet of each color change valve unit to discharge the paint, paint solvent, and air from the same outlet. In addition to discharging either of the two, there are two cleaning valve units that are connected to the paint solvent supply path and the air supply path and can selectively discharge the paint solvent and air supplied from these supply paths.
A circuit for communicating one of the outlet sections of each of the above-mentioned cleaning valve units with the above-mentioned spray gun and communicating the other side with the above-mentioned discharge side, and a circuit that communicates one of the outlet sections of each of the above-mentioned cleaning valve units with the above-mentioned discharge side and the other side. A coating apparatus characterized in that a switching unit is provided for switching between a circuit connected to the spray gun, and the cleaning valve unit and the switching unit are respectively disposed near the spray gun.