JPH06254450A - Coating device - Google Patents

Abstract

PURPOSE:To make a device compact by shortening the cleaning time, carrying out the color change quickly and simplifying the whole structure. CONSTITUTION:A color change valve device 21 is formed by providing a coating material valve connecting body 26 consisting of a one side coating valve 26A and the other side coating material valve 26B connected together, an air valve connecting body 38 composed of a one side air valve 38A and other side air valve 38B connected together and a thinner valve connecting body 40 composed of a one side thinner valve 40A and the other side thinner valve 40B connected together on a manifold 22 on which respective coating material passages 22A and 22B are formed. Either one of respective coating material passage 22A or 22B is connected selectively with a static coater 10 by a one side cleaning valve device 46 through a common coating material pipe 54 and the like, and while a coating material is fed into the static coater 10 through either of the coating passages, the air and thinner are fed into the other coating material passage to carry out cleaning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus suitable for coating an object to be coated such as automobiles and household electric appliances.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional coating apparatus.

In the drawing, reference numeral 1 denotes a color change valve device, which is provided with a manifold 2 in which a single paint passage 2A is formed, and a manifold 2 facing the manifold 2 respectively. A plurality of paint valves 3, 3, ... whose outlets (not shown) are connected to the paint passage 2A, an air valve 4 provided on the manifold 2 at the upstream side of each paint valve 3, and the air The thinner valve 5 is provided on the manifold 2 so as to face the valve 4. Further, each paint valve 3 is connected to a circulation line that circulates paints of different colors such as A color, B color, ... Through paint pipes 6, 6 ,. Is connected to an air source and a thinner source (neither is shown) via an air pipe 7 and a thinner pipe 8.

The paint valve 3, the air valve 4, and the thinner valve 5 are, for example, spring return type air valves, and are driven by compressed air supplied by opening and closing the solenoid valves. The color changing valve device 1 supplies paint to a later-described paint machine 10 at the time of painting, and at the time of changing the paint color, air and thinner are discharged from the air valve 4 and thinner valve 5 to cause the paint passage. 2A etc. are washed.

Reference numeral 9 denotes a paint regulator provided on the downstream side of the manifold 2, and the paint regulator 9 adjusts the valve opening degree in accordance with the control air pressure.
It controls the pressure and discharge amount of the paint.

Reference numeral 10 denotes a rotary atomizing type electrostatic coating machine. The electrostatic coating machine 10 has an atomizing head 10A located at the tip end side for atomizing the paint, and a predetermined amount of the paint of, for example, about -90 kV. An electrode (not shown) charged to a high voltage, and a trigger valve 10B for supplying the paint from the color changing valve device 1 to the atomizing head 10A,
A dump valve 10C for discharging the residual paint, thinner, and the like during cleaning to the waste liquid tank 11 is provided. The electrostatic coating machine 10 atomizes the paint supplied from the color change valve device 1 via the trigger valve 10B and the like by the atomizing head 10A,
By charging the paint particles with electrodes,
The coating is performed by flying and adhering to an object to be coated (not shown) such as a vehicle body held at the ground potential.

Reference numeral 12 denotes a paint pipe, and the paint pipe 1
2 has the atomizing head 10A at the tip side via the trigger valve 10B.
Is connected to the paint passage 2A of the manifold 2 via a paint regulator 9.

The coating apparatus according to the prior art has the above-described structure. When coating A color, the paint valve 3 and the paint regulator 9 to which A color is supplied are opened, and the circulation line is used. The paint A is filled in the paint pipe 12 in advance. When an object to be coated such as a vehicle body or a refrigerator reaches a predetermined position, the trigger valve 10B of the electrostatic coating machine 10 is intermittently opened, and the paint is atomized by the atomizing head 10A and charged to a high voltage. Thus, the paint is flown toward the object to be grounded, and the object is painted.

Next, when the B color is applied, it is necessary to wash the A color paint on the paint pipe 12 or the like before filling the B color into the paint pipe 12. Therefore, the trigger valve 10B is closed, the dump valve 10C and the paint regulator 9 are opened, and then the air is discharged from the air valve 4 into the paint passage 2A of the manifold 2, whereby the paint pipe 12
Forcibly push out the A-color paint, etc. into the waste liquid tank 11,
Thereafter, the thinner from the thinner valve 5 is used to wash away the A-colored paint adhering to the pipe wall and the like. In this cleaning process, air,
The atomizing head 10A of the electrostatic coating machine 10 is also cleaned by alternately sending thinner to clean the interior of the paint pipe 12 and finally opening the trigger valve 10B.

After the cleaning of the paint pipe 12 and the like, filling of B color (color filling) is performed in the same manner as in the case of A color coating.
And paint the object to be coated.

[0011]

By the way, in the above-mentioned conventional coating apparatus, the color changing valve apparatus 1 provided with the paint valves 3, the air valves 4, and the thinner valves 5 of a plurality of colors is used. Color painting can be performed. However, since there is only one discharge system through which the paint flows, at the time of color change, the paint pipe 1 is set by the air valve 4 and thinner valve 5 before filling the next color.
The second grade must be washed.

For this reason, according to the above-mentioned conventional technique, when the color of one coating is changed to the color of another coating, the color changing valve device 1 reaches the electrostatic coating machine 10 through the coating pipe 12 for a long time. There is a problem that it is necessary to wait until the cleaning of the discharge system is completed, it takes a long time to change colors, and the work efficiency of painting work is low.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to shorten the cleaning time and quickly change colors.
It is an object of the present invention to provide a coating apparatus which can greatly improve the work efficiency of the coating work and can be compactly formed by simplifying the entire structure.

[0014]

In order to solve the above-mentioned problems, the constitution adopted by the coating apparatus according to the present invention is the first
With a paint passage and a second paint passage, and the outlet is provided in the manifold.
A plurality of paint valve connecting bodies each of which is formed by connecting a first paint valve connected to the paint passage and a second paint valve having an outflow port connected to the second paint passage to be integrated with each other; A first cleaning fluid valve provided on the manifold at an upstream side of the paint valve connecting body and having an outlet connected to the first paint passage, and an outlet connected to the second paint passage. A cleaning fluid valve connecting body, which is integrally formed by connecting a second cleaning fluid valve, is provided between the outflow side of the first and second paint passages and the coating machine, and any one of the paint passages. One of the first and second paint passages is provided with a tip side washing valve device having a washing fluid valve for selectively connecting one of the paint passages to the painting machine and supplying a washing fluid to the painting machine. While supplying paint to one of the paint passages, supply the cleaning fluid to the other paint passage to perform cleaning. Lies in the fact that the Nau configuration.

[0015]

The tip side cleaning valve device connects one paint passage to the coating machine, and while the paint from the paint valve connecting body is being supplied to the coating machine via the one paint passage, the other paint passage is provided. The cleaning fluid is supplied to the cleaning fluid from the cleaning fluid valve assembly to perform cleaning. When the tip side cleaning valve device is switch-connected from one paint passage to the other paint passage, the paint from the paint valve connection body is supplied to the coating machine through the other paint passage that has been cleaned, and the coating machine Is sprayed onto the article to be coated.

[0016]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIG. 7 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a color changing valve device applied to this embodiment in place of the color changing valve device 1 described in the prior art. The color changing valve device 21 is a manifold 22 and each paint valve which will be described later. .., etc., and is provided with one side paint system 21A and the other side paint system 21B which are independent of each other. Then, the color change valve device 21 is provided with each paint system 21.
Paint, air and thinner are discharged and supplied to the electrostatic coating machine 10 via A and 21B.

Reference numeral 22 denotes a manifold, and the manifold 22 has a plurality of bases 2 as shown in FIGS. 2 and 3.
3M, 23B, 23C, ... 23M, 23N are connected by long through bolts 24, 24, and inside thereof, one side paint passage 22A as a first paint passage and a second paint passage as a second paint passage. The other side paint passage 22B is formed in parallel with being separated in the width direction. Also, each of the bases 23
A, 23B, 23C, ... 23M, 23N are paint passages 2
In order to prevent the paint, thinner, etc. in 2A, 22B from leaking to the outside, they are gas-liquid tightly connected via a sealing member (not shown) such as an O-ring, and are positioned via pins 25, 25, .... Has been done.

Reference numerals 26, 26, ... Show paint valve connecting bodies which are attached to the manifold 22 so as to face each other by mounting bolts, and each paint valve connecting body 26 is a first paint which is connected to one side paint passage 22A. One side paint valve 26A as a valve,
The other side paint valve 26B as the second paint valve connected to the other side paint passage 22B is connected and integrated as described later to form a multiple valve of the same color. Also,
Each paint valve connection body 26 is connected via a paint pipe 27, 27, ... To a circulation line (not shown) for circulating and supplying paints of different colors.

Here, each paint valve connection body 26 is shown in FIG.
As shown in FIG. 7, a thick-walled plate-like casing 28, valve chambers 29A and 29B formed in the casing 28 in the axial direction and spaced apart from each other in the width direction, and slidable inside the valve chambers 29A and 29B, respectively. Movable valve bodies 30A and 30B, and a valve seat member 3 on which the valve bodies 30A and 30B are seated separately.
1A, 31B, pistons 32A, 32B provided in the middle of each valve body 30A, 30B, and each piston 32A,
32B, valve springs 33A and 33B for urging the valve bodies 30A and 30B in the valve closing direction, and the casing 28.
Of the inlet port 35A and the return port 35B, which are opened on both side surfaces of the valve seat member 31A, 31B and are connected to each other by the communication passage 34. It is configured as a spring return type normally closed air valve from the outlets 36A, 36B, etc. which respectively communicate with the paint passage 22B.

The paint valves 27A, 26B are respectively provided with a paint pipe 27, an inflow port 35A, a communication passage 34, and a return port 35.
Paint of the same color is circulated and supplied from the same circulation line via B, and the supply / discharge port 37 shown in FIG.
By supplying and discharging compressed air via A and 37B,
The paint valves 26A and 26B open and close valve bodies 30A and 30B via pistons 32A and 32B, and discharge and supply paint to one side paint passage 22A and the other side paint passage 22B.

Reference numeral 38 denotes an air valve connection body as a cleaning fluid valve connection body provided on the manifold 22 at the upstream side of each paint valve connection body 26, and the air valve connection body 38 is connected to each paint valve connection body. Similar to the body 26, the one side air valve 38A as the first cleaning fluid valve connected to the one side paint passage 22A.
And the other side air valve 38B connected to the other side paint passage 22B
An air source (not shown) that is formed by connecting and integrating with and that supplies cleaning air through the air pipe 39.
It is connected to the.

Reference numeral 40 denotes a thinner valve connection body as a cleaning fluid valve connection body provided in the manifold 22 so as to face the air valve connection body 38, and the thinner valve connection body 40 also has the paint valve connection body 26 and the air valve. Like the connecting body 38, the one-side thinner valve 40A connected to the one-side paint passage 22A and the other-side thinner valve 40B connected to the other-side paint passage 22B are formed by being connected and integrated, It is connected to a thinner source (not shown) for supplying thinner through a thinner pipe 41.

Numeral 42 is located on the downstream side of each paint valve connecting body 26 and is provided in the manifold 22, and one side paint passage 22A is provided.
A one-side paint regulator (shown as “one-side AOPR” in FIG. 6) 43 is provided on the manifold 22 so as to face the one-side paint regulator 42, and is connected to the other-side paint passage 22B. Side paint regulators (shown as "other side AOPR" in FIG. 6) are respectively shown, and the respective paint regulators 42 and 43 are connected to one side paint pipe 44 and the other side paint pipe 45 through a tip side cleaning valve device 46 described later. It is connected to the.

Reference numeral 46 denotes each paint passage 22 of the manifold 22.
A tip side cleaning valve device provided between the outflow side of A and 22B and the electrostatic coating machine 10 and provided in the middle of each paint pipe 44, 45 is shown. (Not shown), a one-side trigger valve 48 provided on the manifold 47 and connected to the one-side paint passage 22A via the one-side paint pipe 44, and the one-side trigger valve 48. One side dump valve 4 which is provided adjacently and connects the one side paint pipe 44 to the waste liquid tank 11 at the time of cleaning.
9 is provided in the manifold 47 so as to face the one side trigger valve 48, and the other side paint passage 2 through the other side paint pipe 45.
The other side trigger valve 50 connected to 2B and the other side trigger valve 50 are provided adjacent to the other side trigger valve 50 and the other side paint pipe 45 at the time of cleaning.
Is connected to the waste liquid tank 11 and a tip side air valve 52 and a tip side thinner valve 53 as a cleaning fluid valve provided on the manifold 47 located on the most upstream side of the paint passage. ing.

The tip side cleaning valve device 46 is connected to the trigger valve 10 of the electrostatic coating machine 10 via the common paint pipe 54.
B is connected to each of the valves 48, 49, 50, 51
By opening and closing the valve, each paint pipe 44, 45
One of the paint pipes and the trigger valve 10B of the electrostatic coating machine 10 are selectively connected via the common paint pipe 54, and at the time of color change, the tip side air valve 52 and the tip side thinner valve 53 are connected. Common paint pipe for air and thinner 54
It is supplied to the electrostatic coating machine 10 via the, and the tip side is partially cleaned.

Here, the one side paint system 21A of the color change valve device 21 has one side paint passage 22A of the manifold 22 and one side paint valve 26 of each paint valve connecting body 26 as shown in FIG.
A, one side air valve 38A of the air valve connecting body 38, one side thinner valve 40A of the thinner valve connecting body 40, and one side paint regulator 42. The other side paint system 21B of the color change valve device 21 is the other side paint. The passage 22B, the other side paint valve 26B, the other side air valve 38B, the other side thinner valve 40B, and the other side paint regulator 43.

The coating apparatus according to this embodiment has the above-mentioned structure, and its operation will be described below with reference to FIG.

First, the one side paint system 21 of the color change valve device 21.
When the object to be coated is coated with the paint from A, the one-side trigger valve 48 of the tip-side cleaning valve device 46 is opened, the one-side dump valve 49 is closed, and the one-side paint regulator 42 is opened. The valve is connected to connect the one-side paint pipe 44 and the common paint pipe 54. Then, the one-side paint valve 26A to which the paint to be applied first and the electrostatic coating machine 10 are supplied.
When the trigger valve 10B of the above is opened, the paint on the circulation line flows from the one side paint valve 26A to the manifold 2
2 is discharged into the one-side paint passage 22A, and from the one-side paint passage 22A, the one-side paint regulator 42, the one-side paint pipe 44, the one-side trigger valve 48, the paint passage of the manifold 47, the common paint pipe 54, and the trigger valve. It is supplied to the atomizing head 10A of the electrostatic coating machine 10 via 10B, atomized and charged to be applied to the object to be coated.

On the other hand, at the time of coating by the one-side coating system 21A (one-side coating process), the other-side coating system 21B performs cleaning (the other-side cleaning process).

That is, when coating one side, the other side trigger valve 50
Is closed and the other side dump valve 51 is opened, and the other side paint pipe 45 is connected to the waste liquid tank 11. Then, from the other side air valve 38B and the other side thinner valve 40B to the other side paint passage 2
When air and thinner are alternately discharged into 2B, this air,
The thinner flows through the other-side paint passage 22B and the other-side paint pipe 45, and the paint remaining during the previous coating by the other-side paint system 21B (the other-side coating process) is flushed to the waste liquid tank 11 for cleaning. Next, the other side paint valve 26B is opened with the other side dump valve 51 open, and the washed other side paint pipe 4 is opened.
The next color paint is supplied into 5 (color filling). In the cleaning process, air is first discharged to extrude the paint in the other side paint pipe 45, and then air and thinner are alternately supplied a plurality of times to supply the other side paint passage 22B and the other side paint pipe 45. The remaining paint inside is washed away, and finally air is supplied to dry the inside.

When the coating by the one side paint valve 26A and the like is completed and the coating by the other side paint valve 26B is then performed, the common paint pipe 54 is used before switching from the one side paint system 21A to the other side paint system 21B. It is necessary to wash the trigger valve 10B of the electrostatic coating machine 10.

Therefore, in the tip side cleaning step, the one-side trigger valve 48 and the other-side trigger valve 50 are closed and the common paint pipe 54, the one-side paint pipe 44, and the other-side paint pipe 45.
After disconnecting and, the trigger valve 10B of the electrostatic coating machine 10 is closed and the dump valve 10C is opened, and the tip side air valve 52 and the tip side thinner valve 53 are connected to the air and thinner inside the common paint pipe 54. Is supplied a plurality of times, and the paint remaining on the common paint pipe 54 and the like for one-side painting is discharged into the waste liquid tank 11. After cleaning the common paint pipe 54 and the like, the trigger valve 10B is opened to flow thinner from the tip side thinner valve 53 to clean the atomizing head 10A of the electrostatic coating machine 10, and further Side paint valve 26B, other side trigger valve 50,
The other side paint regulator 43 is opened to supply the next color. By supplying the next color, the thinner on the front end side of the electrostatic coating machine 10 is discharged.

Next, in the other side coating process by the other side coating system 21B, similarly to the one side coating process described above, the other side coating passage 22B and the electrostatic coating machine 1 are operated by the tip side cleaning valve device 46.
0 and the paint from the other side paint valve 26B is supplied to the electrostatic coating machine 10 through the other side paint pipe 45, the common paint pipe 54, and the like.

On the other hand, during this other side coating process, the one side coating system 21A uses the one side air valve 38A and the one side thinner valve 40A to connect the one side coating pipe 44, etc., in the same manner as the other side cleaning process described above. Wash (one side washing step) and fill the next color paint.

Thus, according to the present embodiment, the manifold 22 in which the paint passages 22A and 22B are formed is provided with the paint valve connecting body 26, the air valve connecting body 38, and the thinner valve connecting body 40 which are multiple valves of the same color. As a result, the color change valve device 21 having the mutually independent paint systems 21A and 21B is configured,
The tip side cleaning valve device 46 selectively connects one of the one side paint passage 22A and the other side paint passage 22B to the electrostatic coating machine 10 via a common paint pipe 54 or the like, and each paint While the paint is supplied to the electrostatic coating machine 10 through one of the paint passages 22A and 22B, air and thinner are supplied to the other paint passage for cleaning. Only by cleaning the common paint pipe 54 and the like by the side cleaning valve device 46, it is possible to quickly perform cleaning between one coating color and another coating color,
The color change time can be surely shortened by the time required for cleaning the paint passages 22A and 22B and the paint pipes 44 and 45.

That is, the one side cleaning time required for cleaning the one side paint system 21A, the one side paint pipe 44, etc. is t1, and the other side required for cleaning the other side paint system 21B, the other side paint pipe 45, etc. If the cleaning time is t2 and the tip side cleaning time required to clean the common paint pipe 54 is t3, then 1
The total cleaning time Ta required for color change once is grasped as the sum of t1 and t3 or the sum of t2 and t3 (T
a = t1 + t3, Ta = t2 + t3).

However, the cleaning time t1 on one side and the cleaning time t2 on the other side do not appear on the surface because they are performed almost at the same time by using the time when the other paint system 21B (21A) supplies the paint, and the actual color The total cleaning time Ta 'which becomes apparent at the time of replacement is only the front end side cleaning time t3 required for cleaning the front end side of the common paint pipe 54 and the like (Ta' = t3).

Therefore, since the cleaning time can be surely shortened by the amounts of t1 and t2, the longer the distance between the color changing valve device 21 and the tip side cleaning valve device 46, the shorter the color changing time is. It becomes larger and the work efficiency of painting work can be greatly improved.

Further, the color changing valve device 21 is provided with a manifold 22 having two paint passages 22A and 22B, and one side paint valve 26A and another side paint valve 26B provided in the manifold 22 and supplied with the same color. And a plurality of paint valve connecting bodies 26 which are connected and integrated, and an air valve connecting body 38 in which one side air valve 38A and the other side air valve 38B are connected and integrated.
And the thinner valve assembly 40, which is formed by connecting the one-side thinner valve 40A and the other-side thinner valve 40B and integrating them, so that two paint systems independent from each other are provided in the single color change valve device 21. 21A and 21B can be formed.

As a result, unlike the case where only two separate color change valve devices are used, the pipe connection between the paint valves 26A and 26B and the like can be dispensed with, and the pipe connection work can be greatly reduced. Therefore, the entire structure can be simplified and formed compactly, and the weight and cost can be reduced.

In the above embodiment, the rotary atomizing type electrostatic coating machine 10 is described as an example, but the present invention is not limited to this, and various types such as an air atomizing type and a hydraulic atomizing type are applicable. Applicable to non-electrostatic coating machines.

Further, in the above embodiment, the case where the air valve and thinner valve as the cleaning fluid valve and the paint valve are incorporated in the same manifold has been exemplified, but instead of this, the air valve and thinner valve are provided separately. It may be incorporated in a manifold and connected to a manifold provided with a paint valve via a gate valve or the like.

Further, although the air valve and the thinner valve have been described as examples of the cleaning fluid valve in the above embodiment, a cleaning water valve may be used in the case of water-based paint instead.

[0045]

As described in detail above, according to the present invention, the first and second manifolds having the first and second paint passages are formed.
A paint valve connecting body formed by connecting the second paint valve and a cleaning fluid valve connecting body formed by connecting the first and second cleaning fluid valves are provided, and the first side and the first side are formed by the tip side cleaning valve device. One of the two paint passages is selectively connected to the coating machine, and the time for supplying the paint to the coating machine via the one paint passage is used to clean the other paint passage. Since it is configured to do so, the entire cleaning time can be reliably shortened by this cleaning time, the color change can be quickly performed to improve the work efficiency of the painting work, and the entire structure can be simplified and compactly formed. it can.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a coating apparatus according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing the color change valve device in FIG. 1 in an enlarged manner.

3 is a cross-sectional view showing a state in which a bolt is removed through a direction of an arrow III-III in FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a plan view of the color change valve device.

FIG. 6 is a time chart of a coating process.

FIG. 7 is an overall configuration diagram of a coating device according to a conventional technique.

[Explanation of reference signs] 10 Electrostatic coating machine (coating machine) 21 Color change valve device 22 Manifold 22A One side paint passage (first paint passage) 22B Other side paint passage (second paint passage) 26 Paint valve connection body 26A One side paint valve (first paint valve) 26B Other side paint valve (second paint valve) 38 Air valve connection body (cleaning fluid valve connection body) 38A One side air valve (first cleaning fluid valve) 38B Other side air valve (second cleaning fluid valve) 40 Thinner valve connection (cleaning fluid connection valve) 40A One side thinner valve (first cleaning fluid valve) 40B Other side thinner valve (second cleaning fluid valve) 46 Tip side washing valve device 52 Tip side air valve (washing fluid valve) 53 Tip side thinner valve (washing fluid valve)

Claims (1)

[Claims] 1. A manifold having a first paint passage and a second paint passage, and a first paint valve and an outlet provided in the manifold and having an outlet connected to the first paint passage. A plurality of paint valve connecting bodies formed by connecting and integrating a second paint valve connected to the second paint passage, and provided on the manifold at the upstream side of each paint valve connecting body. And a first cleaning fluid valve having an outlet connected to the first paint passage and a second cleaning fluid valve having an outlet connected to the second paint passage are integrally connected to each other. The cleaning fluid valve connecting body is provided between the outflow side of the first and second paint passages and the painting machine, and one of the paint passages is selectively connected to the painting machine. ,
A front end side cleaning valve device having a cleaning fluid valve for supplying a cleaning fluid to the coating machine, and while supplying the paint to one of the first and second paint passages, A coating device configured to supply cleaning fluid to the paint passage for cleaning.