JPH0333381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coating device that performs a color change on an object to be coated.

(Prior Art) A large number of painting guns are installed in a painting line for painting automobile bodies and the like. Upstream of each of these paint guns, paint regulators as many as the number of paint colors are installed, and color changing devices with color change valves as many as the number of paint colors are installed. An arbitrary paint is selected from among a large number of paints, and the paint is supplied to a paint gun under constant pressure. For example, in a device that uses two paints A and B of different colors and uses three paint guns, a painting line as shown in FIG. 3 has been used as a prior art. That is, as shown in FIG. 3, a manifold 23 of a color changing device 1 is connected to each of the three painting guns 2, 2, 2 through a pipe 15, and two color changing valves 1a, 1b are connected to the manifold 23. is set up. If we assume that the lower right side of FIG. 3 is the paint A line and the upper left side is the paint B line, then the paint A line is a branch pipe that passes through the paint regulator 9a and the color change valve 1a of the color change device 1. The same number of pipes 12 as the number of installed painting guns 2, that is, three, are connected in parallel to the main pipe 10 for supplying paint, and the paint from the A paint tank 4 is supplied to each branch pipe 9a.
A pressure pump 3 and a branch pipe 12 for pressure-feeding the
Header 13 that collects 12, 12 and paint A
A vacuum pump 5 is provided to adjust the back pressure of the pump. Similarly, regarding the paint B line, the paint regulator 9b is placed on the upstream side, and the paint regulator 9b and the color change valve 1b of the color change device 1 are connected to each other.
Three branch pipes 12 are provided in parallel, and these are connected to a main paint supply pipe 11 having a header 14, a back ram pump 8, a B paint tank 7, and a pressure pump 6.

(Problems with the conventional technology) In the above conventional technology, the paint regulator 9a,
9b is the number of installed paint guns 2 x the number of paint colors, that is, in the example of Fig. 3, 6 units are required, and
Since a plurality of branch pipes 12 are provided in parallel, the total pipe length becomes very long and the piping becomes complicated.Moreover, since the paint regulators 9a and 9b are located at a distance from the paint gun 2, it is difficult to adjust the pressure. There were problems such as delayed response.

The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the number of paint regulators and reduce and simplify the paint piping when a color changing device is installed on the object to be painted. to become
Another object of the present invention is to provide a coating device that can quickly adjust the pressure of the paint in response to changes in the pressure of the paint.

(Means for solving the problem) A means for solving the above problem is to install a plurality of paint guns, the number of color change valves corresponding to the paint guns, and the number of color change valves corresponding to the number of paint colors. A paint regulator having an outlet connected to a paint gun is connected downstream of the color changing device, and a circulating paint supply main pipe is provided with a paint pressure pump. The present invention has a coating device characterized in that a number of channels are provided as many as the colors of the paint, and color changing valves used for the same color in each color changing device are connected in series in the main channel.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a diagram showing a painting line that is an example of a coating device according to the present invention, and Fig. 2 is an enlarged view of a color changing device. In order to
The book is used. It should be noted that the same symbols as in the prior art shown in FIG. 3 indicate exactly the same parts in the present invention shown in FIG.

Now, the paint regulator 9 that controls the supply pressure of paint supplied to the paint gun 2 to a constant value is connected to the downstream side of the manifold 23 of each color changing device 1 corresponding to the paint gun 2, and its discharge side is connected to the pipe line 15.
It is connected to the painting gun 2 by. That is, only one paint regulator 9 is installed in each color changing device 1 regardless of the number of paint colors, and since it is installed closer to the painting gun 2 than the conventional one, it is difficult to adjust the paint supply pressure. Responsiveness has also improved significantly.

Further, each color changing device 1 is provided with two color changing valves 1a, 1b for the number of paint colors, that is, in this embodiment, two types of paints A and B are used. If the lower right side of Figure 1 is the paint A line, all color change valves 1a, 1 for the paint A line
a, 1a are connected in series through a main paint supply pipe 10, and all color change valves 1b, 1b, 1b are also connected in series with another paint supply main pipe 11 for the other paint B line on the upper left side in FIG. It is connected. Flow resistance is applied to the paint tanks 4 and 7 for paints A and B, the pressure pumps 3 and 6 for paints A and B, and the main pipes 10 and 11 to maintain the back pressure of paints A and B. Adjustable batch pumps 5 and 8 are arranged in series.

That is, in the case of the present invention, the branch pipe 12 is
... and headers 13 and 14 are unnecessary, making the pipe line simple and short.

The specific configuration of the color changing device 1 when there are two types of paint, A and B, is as shown in FIG. One color change valve 21 is connected to the manifold 23 regardless of the number of color change valves. The color change valves 1a, 1b and the valves 21, 22 each have a needle valve 25 that moves forward and backward within the valve chamber 24 and is connected to a piston 26 in an air cylinder 27 at the rear. By supplying and exhausting pressurized air, the piston 26 moves forward and backward together with the spring member 28 connected to the piston 26, and the needle valve 25
It opens and closes.

Furthermore, each painting gun 2 is provided with a discharge pipe 17 with an on-off valve 16, so that residual paint from the manifold 23 to the painting gun 2 can be removed efficiently and quickly during cleaning associated with color changes. It's summery.

In the embodiment, the number of painting guns 2 is three and the number of paint colors is two. However, the number of painting guns 2 and the number of paint colors are not particularly limited. Needless to say, paint regulators 9 and color changing devices 1 corresponding to the number of colors may be provided, and the number of color changing valves of the color changing device 12 may be provided corresponding to the number of colors.

The operation of this embodiment will be described below. First, if we consider the case where paint A is painted with paint guns 2, 2, 2, paint A supplied from paint A tank 4 and pressurized by pressure pump 3 is supplied to the main paint supply pipe. It is sent to the color change valves 1a, 1a, 1a of the three color change devices 1, 1, 1 through the line 10, and from the last color change valve 1a via the back dam pump 5, which is a line resistance, to A. The paint is returned to the paint tank 4 and circulated there.
Here, the paint A that has entered the color change valve 1a is sent to the paint regulator 9 through the needle valve 25 which is in an open state by supplying pressurized air, the pressure is adjusted, and the paint A is sent to the paint gun 2. be painted. In this case, the needle valves 25 of the other color change valves 1b and valves 21 and 22 are in a closed state.

When painting with paint A is completed, the needle valve 25 of each color change valve 1a is closed, and the needle valve 25 of the expulsion air valve 22 is opened to push out paint A with pressurized air supplied from the air line 31 and clean it. The needle valve 25 of the thinner valve 21 is opened, and the manifold 23, conduit 15, etc. are cleaned with thinner supplied from the thinner line 30. In this case, if the on-off valve 16 in the discharge pipe 17 is used, the pipe can be cleaned efficiently and quickly. When cleaning is completed, the needle valves 25, 25 of the valves 21, 22 are closed, and the needle valve 25 of the color change valve 1b is opened, and painting with paint B is carried out in exactly the same way as paint A.

(Effects of the Invention) As is clear from the above, according to the present invention, since the paint regulator is provided downstream of the color changing device, the number of expensive paint regulators can be minimized, and each color is connected to the main pipe for supplying the paint. Since all the color change valves of the same color of the change device are connected in series,
The pipe line can be shortened, and the structure of the pipe line can be simplified. Furthermore, since the paint regulator is located close to the paint gun, it can quickly respond to changes in paint pressure in the paint gun.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a painting line which is an example of a painting device according to the present invention, FIG. 2 is an enlarged view of a color changing device,
FIG. 3 is a diagram showing a coating line which is an example of a coating apparatus according to the prior art. Note that 1 is a color change device, 1a and 1b are color change valves, and 2
1 is a paint gun, 3 and 6 are pressure pumps, 9 is a paint regulator, and 10 and 11 are main pipes for supplying paint.

Claims (1)

[Claims] 1. In a painting equipment that has a plurality of painting guns and a color changing device installed in correspondence with the number of painting guns and provided with color changing valves as many as the number of colors of paint, a color changing device downstream of the color changing device A paint regulator is connected to the paint regulator whose outlet is connected to the paint gun, and a number of circulating paint supply main pipes each equipped with a paint pressure pump are provided for the number of paint colors. A painting device characterized by connecting color change valves in series.