JPH06343914A - Coating supply device - Google Patents

Abstract

PURPOSE:To reduce the loss of thinner for cleaning and loss of coating during the change of a color by shortening all the length of piping for coating supply and coating return, in the coating supply device which supplies the coating to each one of coating application provided on both sides of a coating line and recovers excess coating. CONSTITUTION:The downstream side end of coating supply piping 10 arranged at one end part of a coating booth 5 is allowed to communicate with the upstream side end of piping 11 for returning the coating arranged at the outer end part through an orifice 12. At the same time, bypass piping 16 for connecting the coating supply piping 10 to the piping 11 for returning the coating is provided, and the coating applicators 6, 7 are connected to this bypass piping 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint supply device for supplying and collecting paint to a plurality of coating devices arranged on both sides of a coating line.

[0002]

2. Description of the Related Art In a coating apparatus, when the coating material stays in the coating material supply pipe, the coating material solidifies. Therefore, for example, in Japanese Utility Model Laid-Open No. 62-130768, a surplus coating material not used for coating is coated. A technique has been disclosed in which a paint is constantly circulated between a paint tank and a coating device by providing a return pipe for collecting in the tank to prevent the above solidification.

By the way, when painting a vehicle body or the like, as shown in FIG.
As shown in Fig. 3, in order to apply undercoat, intermediate and top coats to each part such as the roof part and side parts of the vehicle body, a plurality of paint lines are provided on both sides and at the top of the paint booth 31 provided on the paint line. Coating equipment 32-3
2, 33-33 are provided. Therefore, the paint tank 3
4 and the coating devices 32 to 32, 33 to 33 are connected by the coating material supply pipes 35A and 35B, and the coating material in the coating material tank is supplied by the pressure feed pump 36, and the coating devices 32 to 32, 3 are supplied.
A paint supply device for collecting the excess paint from 3 to 33 into the paint tank 34 by the paint return pipes 37A and 37B is provided.

In that case, conventionally, the coating devices 32 to 32,
In order to supply the paint to 33 to 33, first, the paint supply pipe 35A is piped along one side of the coating booth 31, transferred to the other side at the coating line end, and then reversed along the other side. The paint supply pipe 35B is piped in the direction. In addition, the paint recovery pipes 37A and 37B are provided on both sides of the paint booth 31 to collect the paint.
A method of joining the A and 37B and returning the paint to the paint tank 34 via the back pressure valve 38 has been adopted.

Incidentally, FIG. 4 shows a paint piping line for one color of paint, and when it is necessary to change the paint color (color change) according to the vehicle type etc. at the paint station, the same number of paints as that color is applied. A pipe line is provided, and the coating devices 32 to 32, by the color change valves 39 to 39 provided in the coating devices 32 to 32 and 33 to 33, respectively.
The paint piping line is selectively switched for 33 to 33.

[0006]

By the way, at the time of the above color change, if the paint color that has been used up to now is no longer used due to a model change of the vehicle body, etc., the paint piping line for that paint color And paint tank 34
The paint must be extracted from the product and discarded, and the interior of the pipe and the like must be cleaned with thinner to prepare for the use of paint of a new paint color. However, in the conventional paint supply device shown in FIG. 4, since the paint supply pipes 35A and 35B and the paint return pipes 37A and 37B are provided on both sides of the paint booth 31, respectively, the pipe length is very long, and therefore the entire pipe length is small. Has a very large paint volume, and a large amount of paint must be discarded at the time of the above color change, resulting in increased paint loss and loss of thinner used for cleaning, as well as color change. It takes a long time and becomes inefficient.

When the pipe length increases as described above,
An upstream end of the paint supply pipe 35A and a paint return pipe 37A,
There is a problem in that the pressure loss with the downstream end of 37B becomes large, and it is necessary to increase the capacity of the pressure feed pump 36 or increase the diameter of the pipe.

Further, in the conventional paint supply device of FIG.
A regulator is provided on the outflow side of each of the coating devices 32-32, 33-33 by providing a pressure difference between the inflow side and the outflow side of the coating devices 32-32, 33-33 so that the coating flows at a predetermined flow velocity. 40 to 40 are provided, and the regulator 40 limits the outflow rate of the paint. However, if such a regulator 40 is provided, in the case of a metallic paint, the metallic pieces or pigments, such as aluminum in the paint, are deformed by the above-mentioned squeezing while repeatedly passing through the regulator 40, resulting in a tint when painted. There is a risk that the coating quality will deteriorate, such as when the value changes.

Therefore, an object of the present invention is to provide a paint supply device which can significantly reduce the length of a pipe used for supply and recovery of paint and which does not require a regulator.

[0010]

That is, the invention according to claim 1 of the present invention (hereinafter referred to as the first invention) is such that a plurality of coating devices are arranged on both sides of a coating line, respectively. A paint supply pipe for supplying paint to the coating device and a paint return pipe for collecting surplus paint from the paint supply pipe, wherein the paint supply pipe is on one side of the coating line. Part is provided along the line, the paint return pipe is provided on the other side along the line, and the downstream end of the paint supply pipe and the upstream end of the paint return pipe are At the end of the coating line, a bypass pipe is provided that is connected via an orifice and that connects the paint supply pipe and the paint return pipe across the coating line.The bypass pipe is connected to the coating devices on both sides of the coating line. Characterized in that it is.

The invention according to claim 2 (hereinafter referred to as the second
In the coating line, the coating lines are provided in two rows in parallel, and the paint supply pipes in each coating line are arranged on the opposite side parts. Each of the upstream side ends is branched from the main paint supply pipe.

Furthermore, the invention according to claim 3 (hereinafter referred to as the third invention) is characterized in that a top coating device for coating the upper surface of the object to be coated is connected to the bypass pipe.

[0013]

According to the first aspect of the present invention, since the coating device is provided in the bypass pipe connecting the paint supply pipe and the paint return pipe, it is necessary to dispose the paint supply pipe and the paint return pipe over both sides of the coating line. It is possible to reduce the total pipe length. In that case, the paint supply pipe and the paint return pipe are connected by an orifice, and the pressure in the paint supply pipe is reliably kept higher than the pressure in the paint return pipe,
This ensures that the paint will flow through each bypass passage, so that the paint can be applied without using a regulator.

According to the second aspect of the invention, it is not necessary to dispose the paint supply pipe and the paint return pipe over both sides of the coating line, the total length of the pipe can be shortened, and the coating lines arranged in parallel face each other. Since each paint supply pipe is provided on the side where the paint is supplied and the upstream ends of these are branched from the main paint supply pipe, each paint supply pipe is connected in parallel to the main paint supply pipe. The lengths of the paint supply pipes are almost the same, and the flow velocity of the paint flowing through both coating lines and other conditions are kept constant.

Further, according to the third aspect of the invention, since the bypass pipe is provided and the top coating device is provided therein, the routing of the paint pipe with respect to the top coating device is simplified.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. As shown in FIG. 2, a roof portion 3 of a vehicle body 2 conveyed by a carriage 1,
In order to apply coating to each part such as the side part 4, a plurality of coating devices 6 to 6 are arranged at predetermined intervals on both sides of a coating booth 5 provided in the coating line, and a top coating device is also provided. An appropriate number of 7 to 7 are arranged.

In that case, as shown in FIG. 2, at each coating work position of the coating booth 5, a gate-shaped column 8 is erected upright so as to straddle the coating line, and the vertical frame portion 8A of the column 8 supports the vehicle body. The above-mentioned coating devices 6 and 6 for coating the side portion 4 and the like of the vehicle body 2 are attached, and the roof portion 3 of the vehicle body 2 is attached to the upper frame portion 8B of the pillar 8.
The above-mentioned top coating device 7 for coating etc. is attached. The coating devices 6 and 7 are robot devices 9
~ 9 (not particularly limited),
The vehicle body 2 is painted.

On the other hand, on one side of the coating booth 5,
The paint supply pipe 10 is arranged in the length direction of the coating line, and the paint return pipe 11 is arranged on the other side part, and the downstream end of the paint supply pipe 10 is the paint return line end of the coating line. Orifice 1 at the upstream end of pipe 11
It is communicated via 2. The upstream end of the paint supply pipe 10 is connected to a pressure pump 14 that pumps the paint in the paint tank 13, and the downstream end of the paint return pipe 11 is connected to the paint tank 13 via a back pressure valve 15. .

The coating booth 5 is provided with bypass pipes 16 to 16 for connecting the paint supply pipe 10 and the paint return pipe 11 at the positions where the coating devices 6 to 6 and 7 to 7 are provided. Each of the bypass pipes 16 to 16 is attached to the column 8 of FIG. 2, and the coating devices 6 to 16 are attached to the bypass pipes 16 to 16.
6, 7 to 7 are connected to these bypass pipes 16 to 1
The paint is supplied from 6 to each of the coating devices 6 to 6 and 7 to 7.

Note that FIG. 1 shows a paint piping line for only one color, and when it is necessary to change the paint color (color change) according to the type of vehicle at the paint station,
The same number of coating piping lines as the colors are provided, and the coating piping lines are switched and selected by the color change valves 17 to 17 provided in the respective coating devices 6 to 6 and 7 to 7.

According to such a paint supply device, the paint discharged from the paint tank 13 flows through the paint supply pipe 10 by the pressure pump 14 and flows into the paint return pipe 11 through the orifice 12 and the respective bypass pipes. 16
Through 16 to the paint return pipe 11 to the paint return pipe 11
Paint also flows in. Therefore, each coating device 6-6,
7 to 7 is possible, and the excess paint not used for painting is collected from the paint return pipe 11 to the paint tank 13, and the paint is circulated by such movement.

Therefore, the piping line may have a line configuration in which one paint supply pipe 10 is arranged on one side of the coating booth 5 and one paint return pipe 11 is arranged on the other side. As a result, the total pipe length is greatly reduced compared to the conventional one shown in FIG. Therefore, the paint volume in all pipes is significantly reduced, and the paint loss at the time of color change when discarding the unused paint and the loss of thinner used for washing are reduced, and this color change is necessary. Working time is shortened and efficiency is increased.

Further, since the total pipe length is shortened, the pressure loss between the upstream end of the paint supply pipe 10 and the downstream end of the paint return pipe 11 is reduced, and therefore the capacity of the pressure feed pump 14 is increased. In addition, there is no need to increase the diameter of the pipe, and in particular because the diameter of the pipe can be shortened, the piping space for bundling the piping of the multicolor coating piping line is reduced and the piping becomes easier.

By the way, as described above, the paint supply pipe 10
Since the paint and the paint return pipe 11 are communicated with each other through the orifice 12, the flow velocity of the paint flowing into the paint return pipe 11 is narrowed by the orifice 12, and the pressure in the paint supply pipe 10 is reduced. Kept higher than the pressure inside. In other words, if the above-mentioned pressure difference is created by the orifice 12 so that the minimum flow velocity at which the metallic pieces of the paint do not precipitate in each pipe or a flow velocity higher than that is obtained, the pressure difference causes each bypass pipe 1
Since the paint will surely flow to 6 to 16, the paint can be applied without using a regulator as in the conventional case. Therefore, the problem of deformation of metallic pieces in the paint due to the use of the regulator does not occur, and good quality painting can be obtained.

Further, since the top coating device 7 for coating the roof portion 3 of the vehicle body 2 is connected to the bypass pipe 16 arranged so as to straddle the coating booth 5, this top coating device 17 is connected. The piping structure for supplying and returning the paint to and from will be simplified.

FIG. 3 shows a second embodiment of the present invention, in which two coating lines are provided and the same coating booths 5A and 5B as in FIG.
Are arranged in parallel.

In the case of this embodiment, each coating booth 5A,
5B paint supply pipes 10A and 10B are both coating booths 5.
A and 5B are arranged on opposite sides, paint return pipes 11A and 11B are arranged on the other side, respectively, and a main paint supply connected to the above-mentioned pressure feed pump 14 (see FIG. 1). From the pipe 18 to each paint supply pipe 10A, 10
B is branched and arranged. Also, the paint return pipe 1
The downstream ends of 1A and 11B are also joined and communicated with the main paint return pipe 19. The other construction of each coating booth is the same as that of the embodiment of FIG.

According to this, as in the first embodiment, the pipe length of the coating booths 5A and 5B is shortened, the paint loss and thinner loss at the time of color change are reduced, and the work time at the time of color change is shortened. Can be achieved.

In addition, according to the structure of FIG. 3, each series connection body of the paint supply pipe 10A and the paint return pipe 11A, and 10B and 11B in both the coating booths 5A and 5B,
Since the branch point P1 for the main paint supply pipe 18 and the confluence point P2 for the main paint return pipe 19 are connected in parallel, the pipe lengths of both coating booths 5A, 5B between both points P1, P2 are substantially the same. Therefore, the flow velocity and the pressure loss condition of the paint flowing in both coating booths 5A and 5B can be made the same, and both coating booths 5A and 5B can be obtained.
The coating conditions are the same.

[0031]

As apparent from the above description, according to the first aspect of the present invention, since the coating device is provided in the bypass pipe connecting the paint supply pipe and the paint return pipe, the paint supply pipe and the paint return pipe are provided. It is not necessary to arrange the pipes on both sides of the painting line, and the total pipe length can be shortened.
In that case, the paint supply pipe and the paint return pipe are connected by an orifice, and the pressure in the paint supply pipe is reliably kept higher than the pressure in the paint return pipe. It will flow and you can paint without using a regulator.

For this reason, it is possible to reduce the loss of the paint and the thinner for cleaning at the time of color change, shorten the color change work time to improve the efficiency, and to apply the coating due to the deformation of metallic pieces in the paint. The deterioration of the condition can be prevented.

Further, according to the second invention, the same effects as those of the first invention can be obtained, and the paint supply pipes are provided on the opposite side sides of the coating lines provided in parallel,
Since these upstream ends are merged, each paint supply pipe will be connected in parallel to the main paint supply pipe, and the lengths of both paint supply pipes will be almost the same and will flow to both paint lines. Since the flow velocity of the paint and other conditions are kept constant, it is possible to perform coating under the same conditions.

Further, according to the third aspect of the invention, since the top coating device is provided in the bypass pipe extending over the coating line, the routing of the paint pipe to the top coating device is simplified.

[Brief description of drawings]

FIG. 1 is a piping diagram of a paint supply device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a coating booth in the coating material supply device.

FIG. 3 is a piping diagram showing a second embodiment of the present invention.

FIG. 4 is a piping diagram showing a conventional example.

[Explanation of symbols]

 5,5A, 5B coating booth 6 coating device 7 top coating device 10,10A, 10B paint supply pipe 11,11A, 11B paint return pipe 12 orifice 16 bypass pipe 18 main paint supply pipe 19 main paint return pipe

Claims (3)

[Claims] 1. A plurality of coating devices are respectively arranged on both sides of a coating line, a paint supply pipe for supplying paint to these coating devices, and a paint return pipe for collecting surplus paint from the paint supply pipe. And a paint supply pipe is provided along one line on one side of the coating line, and the paint return pipe on the other side along the line. The downstream end of the paint supply pipe and the upstream end of the paint return pipe are connected via an orifice at the painting line end, and the paint supply pipe and the paint return pipe are straddled across the painting line. A paint supply device, characterized in that a bypass pipe is provided, and the above-mentioned coating devices on both sides of the coating line are connected to the bypass pipe. 2. The coating line is provided in two rows in parallel, and the coating material supply pipes of the respective coating lines are arranged on opposite side portions, and the upstream end of each of the coating material supply pipes is arranged. The coating apparatus according to claim 1, wherein the coating apparatus is branched from the main coating material supply pipe. 3. The paint supply device according to claim 1, wherein the bypass pipe is connected to a top coating device that coats the upper surface of the object to be coated.