JPH0822399B2 - Coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a coating apparatus configured so that a plurality of paints having different colors can be switched and sprayed, and particularly, a time required for a color changing process can be shortened. A coating device improved accordingly.

<Prior Art> As a coating apparatus capable of switching and spraying paints of a large number of colors using a single coating machine, for example, JP-A-60-610.
As disclosed in Japanese Patent Publication No. 76, a large number of paint valves are connected in parallel to a single path, and when changing colors, first a solvent such as thinner is pressure-fed into the path to wash the previous color, Devices are then known for filling the path with the next color.

<Problems to be Solved by the Invention> According to such a conventional apparatus, a loss time is generated while cleaning the route, and when the frequency of color change is high, the loss time is integrated to improve productivity. It can be a factor to decrease.

In order to improve such inconvenience, by providing two routes each including a paint valve and a cleaning valve, and while one of them is spraying the paint, the other is cleaned, the loss time is reduced. Can be reduced.

However, according to such a configuration, two coating devices having almost the same configuration are required, which not only increases the installation space and facility cost, but also requires a large burden on the maintenance and management side. .

In view of such problems of the conventional technology, a main object of the present invention is to provide a coating apparatus capable of reducing loss time due to color change as much as possible while suppressing an increase in equipment scale to a minimum. To provide.

<Means for Solving the Problems> According to the present invention, such an object is provided with a coating machine for spraying coating material toward an object to be coated, an air valve, a thinner valve and a plurality of coating valves, and A coating device having a color conversion valve device in which passages from each of these valves are gathered in a manifold and configured to be capable of spraying by switching paints of a plurality of colors, and a position communicating with a coating machine. A cleaning valve device having a switching valve device for selectively selectively switching to a position communicating with the outside of the device, each having two paths connected to the coating machine at the downstream end, and an air valve and a thinner valve And 2
One of the two paths communicates with the color conversion valve device, and the other communicates with the cleaning valve device, and one path communicates with the cleaning valve device, and the other path communicates with the color conversion valve device. In order to selectively switch between the communicating state and the color changing valve device, the washing valve device and the upstream ends of the two paths are connected to each other 4
It is achieved by providing a coating device characterized by having a one-way switching valve.

In particular, it is advisable to connect a second cleaning valve device composed of a thinner valve and an air valve to the merging portion of the two paths.

<Operation> With this configuration, the path connected to the color conversion valve device and the path connected to the cleaning valve device can be selectively switched by the four-way switching valve, and one path can be cleaned during cleaning. ,
It is possible to fill the other path with paint.

In particular, if only the coating machine portion can be cleaned independently by the second cleaning valve device, the cleaning time can be further shortened.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a circuit system diagram showing an entire coating apparatus constructed according to the present invention.

The coating device 1 includes a color conversion valve device 2 and a first cleaning valve device 3
Are selectively communicated with two paths of a first path 5 and a second path 6 via a four-way switching valve 4 driven by a solenoid or the like, and these two paths 5 and 6 are connected to two sets of trigger valves 7 ,
3 via a switching valve device consisting of 8 and dump valves 9 and 10.
After merging into the path 11, the coating material is sprayed from the nozzle 13 of one coating machine 12 toward the article to be coated 14.

The color conversion valve device 2 is a first device that controls the pressure feeding of a solvent such as thinner.
A thinner valve 15, a first air valve 16 for controlling compressed air, and paint valves P1 to Pn provided corresponding to each color to control the pressure feeding of many different colors are connected in parallel to one manifold 17. The discharge port of the manifold 17 is connected to the first input port 18 of the 4-way switching valve 4.

The first cleaning valve device 3 is a device in which only the air valve and the thinner valve portion of the color conversion valve device 2 described above are independent, and the discharge port thereof is connected to the second input port 19 of the four-way switching valve 4. .

First output port 20 and second output port of 4-way switching valve 4
21 is connected to the first and second paths 5 and 6, respectively. Both of these paths 5 and 6 pass through paint regulators 22 and 23 for controlling the discharge amount of the paint, respectively, and the ends thereof are the first and second trigger valves 7 and 7, which are three-way switching valves.
8 input ports are connected respectively. One of the output ports of the two trigger valves 7 and 8 communicates with the drain Dr through the first and second dump valves 9 and 10 which are open / close valves,
The other output port is connected to the manifold 24 in parallel. A second washing valve device 25 similar to the first washing valve device 3 is connected to one end of the manifold 24, and the other end is the third washing valve device 25.
It is connected to the coating machine 12 via a path 11. Then
Both the first and second paths 5 and 6 can be switched between communication with the drain Dr and communication with the third path 11.

The coating machine 12 can interrupt the paint by the third trigger valve 26 and the third dump valve 27 provided inside. The trigger valve 26 and the dump valve 27 are also configured similarly to the first and second valves described above, and the communication with the third path 11 can be switched to the nozzle 13 and the drain Dr.

Next, the operation of the above embodiment will be described with reference to FIG.

In the state shown in FIG. 1, the color conversion valve device 2 side is on the first path 5
Further, the first cleaning valve device 3 side communicates with the second path 6.
If it is supposed that the first color is applied in this state, the paint pressure-fed from the first paint valve P1 will flow through the first path 5, the first paint regulator 22, the first trigger valve 7, and the third path 11. After that, it is sprayed from the nozzle 13 of the coating machine 12.

At the time of color change, first, the first paint valve P1 is closed, and at the same time, the first thinner valve 15 is opened to pump an appropriate amount of thinner to the first path 5 (step A). As a result, the paint in the manifold 17 is expelled, and the thinner is filled in the manifold 17.

Next, the four-way switching valve 4 is switched so that the paint valve device 2 side is communicated with the second path 6 and the first washing valve device 3 side is communicated with the first path 5 through which the first color has flowed through. . At this time, at the same time, the second thinner valve 29 of the first cleaning valve device 3 is opened to feed the thinner to the first path 5 (step B). In parallel with this, the first air valve 16 and the first thinner valve 15 are alternately operated to clean the inside of the manifold 17 and the inside of the four-way switching valve 4. This cleaning liquid is discharged via the second path 6.

Subsequently, the first trigger valve 7 communicating with the third passage 11 via the manifold 24 is switched to the first dump valve 9 side, and the first dump valve 9 is opened according to the flow of the thinner (step C). At this time, the second trigger valve 8 is the second dump valve.
The second dump valve 10 communicates with the 10 side and the second dump valve 10 is open, that is, the second path 6 communicates with the drain Dr.

In this state, the second thinner valve 28 of the first cleaning valve device 3 and the second thinner valve 28
The air valve 29 is alternately operated to clean the inside of the first path 5. This cleaning liquid is discharged from the first dump valve 9 to the drain Dr. This operation is performed for a while, and the first trigger valve 7
And the inside of the 1st path | route 5 containing the 1st dump valve 9 is completely cleaned (process C or subsequent ones).

On the other hand, in parallel with the above operation, the third thinner valve 30 and the third air valve 31 on the side of the second cleaning valve device 25 are alternately operated to change the third
Clean route 11. At the same time, the third trigger valve in the coating machine 12
26 and the third dump valve 27 are operated to clean the inside of both valves 26, 27 and the nozzle 13.

The second color valve P2 is opened at an appropriate timing between these operations (step D), and the second color is pressure-fed to the second path 6 that has been cleaned in the same manner as above. At this time, since the second path 6 communicates with the drain Dr as described above, the filling of the paint in the second path 6 is completely achieved while the air is being removed.

Since the third path 11 is relatively short, the cleaning is completed relatively early. Then, when the filling of the second color into the second path 6 is completed, the second trigger valve 8 is switched to the manifold 24 side, and when the third path 11 is filled with the coating material, the spraying of the second color is immediately started. It becomes possible (step E). Further, at this time, since the first path 5 is unrelated to the spray of paint, the cleaning operation can be continuously performed.

By repeating this operation alternately thereafter, the color changing step can be performed with extremely high efficiency.

<Effects of the Invention> As described above, according to the present invention, the color conversion valve device and the cleaning valve device are provided in parallel, and two paths communicating with them are provided. It is possible to perform the cleaning in parallel, and it is possible to minimize the loss time due to the color change. Moreover, since it is not necessary to increase the color conversion valve device itself, productivity can be improved without significantly increasing the scale of the conventional equipment, and the effect is extremely large.

[Brief description of drawings]

FIG. 1 is an overall system diagram of a coating apparatus according to the present invention. FIG. 2 is a time chart showing the operation sequence of the device. DESCRIPTION OF SYMBOLS 1 ... Coating device, 2 ... Color conversion valve device 3 ... First cleaning valve device, 4 ... 4-way switching valve 5 ... First path, 6 ... Second path 7 ... First trigger valve, 8 ...... Second trigger valve 9 ...... First dump valve, 10 ...... Second dump valve 11 ...... Third path, 12 ...... Coating machine 13 ...... Nozzle, 14 ...... Painting object 15 ...... First thinner Valve, 16 ... First air valve 17 ... Manifold, 18 ... First input port 19 ... Second input port, 20 ... First output port 21 ... Second output port 22,23 ... Paint regulator 24 …… Manifold, 25 …… Second flush valve device 26 …… Third trigger valve, 27 …… Third dump valve 28 …… Second thinner valve, 29 …… Second air valve 30 …… Third thinner valve , 31 …… Third air valve Dr …… Drain, P1 ～ Pn …… Paint valve

Claims (2)

[Claims] 1. A color changing valve device comprising a coating machine for spraying a coating material onto an object to be coated, an air valve, a thinner valve and a plurality of coating valves, and a passage from each of these valves being collected in a manifold. And a coating device configured to switch and spray a plurality of colors of paint, wherein the position for communicating with the coating machine and the position for communicating with the outside of the device can be selectively switched individually. Two paths each provided with a switching valve device at the downstream end and both of which are connected to the coating machine; a cleaning valve device having an air valve and a thinner valve; one path of the two paths and the color. A state in which the valve switching device communicates with each other and the other path communicates with the cleaning valve device; and the one path communicates with the cleaning valve device,
And, in order to selectively switch between the other path and the state in which the color conversion valve device is in communication, a four-way switching that connects the color conversion valve device and the cleaning valve device to each upstream end of the two paths. A coating device having a valve. 2. The second path comprises a thinner valve and an air valve at a confluence portion of the two paths, which are connected to the coating machine by merging immediately downstream of the switching valve device. The coating device according to claim 1, wherein the cleaning valve device is connected.