JP2000070770A - Coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coater capable of coping with both mass production and diversified small-quantity production and capable of decreasing the color change loss of paint and improving productivity. SOLUTION: This coater has a coating gun 10 provided with a spraying means for spraying paint, a fixed paint feeder 4 fixed and connected to the coating gun 10 and a cartridge paint feeder 5 detachably attached to the coating gun 10. The paint is supplied to the spraying means from either the fixed paint feeder 4 or the cartridge paint feeder 5. A double feed tube 2 is provided for the coating gun 10, a paint nozzle 51 is furnished at the tip of the coating paint feeder 5, the fixed paint feeder 5 is connected to an intermediate hole 31 in the feed tube 2, and an inner hole 32 is preferably arranged so that the paint nozzle 51 is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a coating apparatus suitable for both mass production and small quantity production.

[0002]

2. Description of the Related Art When a spray coating is performed on an automobile body or the like, a coating apparatus mainly including a coating gun mounted on a robot arm is generally used. Conventional coating equipment 9
As shown in FIG. 5, a paint supply device (not shown) is connected to a coating gun 90.

[0003] As shown in FIG.
It has a bell cup 11 for spraying paint, an air motor 92 for rotating the bell cup 11, and a feed tube 93 for sending paint to the bell cup 11. The feed tube 93 is connected to a pipe 98 communicating with the paint supply device.

The paint supply device has a plurality of paint tanks for storing paint, and is configured to switch the communication between the paint tanks and the pipe 98 by a color change valve. When the paint to be painted is changed (when the color is changed), the paint tank connected to the pipe 98 is switched by the color changing valve, and the pipe 98 and the like are washed.

[0005]

However, the conventional coating apparatus 9 has the following problems. That is, when performing color change using the conventional coating device 9, as described above,
It is necessary to clean the pipe 98 and the like. In the washing at the time of the color change, it is necessary to discard the paint remaining in the pipe 98. Therefore, the conventional coating device 9
Each time the color is changed, paint loss occurs. Therefore, the conventional coating device 9 is not suitable for small-quantity multi-product production.

On the other hand, conventionally, it has been proposed to supply a paint to a paint gun by using a paint tank unit of a cartridge type (Japanese Patent Laid-Open No. 8-229446). In this case, paint loss at the time of color change can be greatly reduced, so that it is suitable for small-quantity multi-product production. However, in this case, when one type (one color) of coating is applied in a large amount, the paint tank unit is frequently replaced, and the productivity is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and can cope with both large-volume production and small-volume, multi-product production, with the aim of reducing loss of color change paint and improving productivity. It is an object of the present invention to provide a coating apparatus capable of performing the above.

[0008]

According to a first aspect of the present invention, there is provided a paint gun having a spraying means for spraying paint, a fixed paint supply device fixedly connected to the paint gun, and a detachable paint gun. A cartridge-type paint supply device that is mounted so as to be mounted, and that the supply of the paint to the spraying means is performed from either the fixed paint supply device or the cartridge-type paint supply device. In the coating equipment.

What is most notable in the present invention is that two types of paint supply devices, the fixed paint supply device and the cartridge type paint supply device, are provided for the paint gun, and the paint supply source is provided. That is, it can be selected.

[0010] As the spraying means of the coating gun, for example, means for atomizing the paint by rotating a bell cup, means for atomizing the paint by using the force of compressed air, and the like can be applied. . The above-mentioned fixed paint supply device refers to a paint supply device in which a separately disposed paint tank is connected to a painting gun via piping or the like. In addition, the fixed type paint supply device includes a device provided with a conventional color change valve so that a plurality of paint tanks can be used properly.
The above-mentioned cartridge type paint supply device refers to a device in which the paint to be painted is built in and the paint is supplied directly to the painting gun without passing through piping or the like.

Next, the operation of the present invention will be described. In the present invention, the fixed paint supply device is connected to the coating gun, and the cartridge paint supply device is configured to be detachable. Therefore, two effects can be obtained, that is, an improvement in production efficiency in mass production and a reduction in loss of color change paint in mass production in small quantities.

That is, at the time of mass production, the supply source of the paint to the coating gun is the fixed paint supply device. Thus, the painting operation can be continued with high efficiency by continuously supplying a large amount of paint from the fixed paint supply device.

On the other hand, when frequent color changes are required for high-mix low-volume production, paint is supplied from the cartridge-type paint supply device. When the color is changed, the cartridge is replaced with a cartridge-type paint supply device that stores paints of different colors. This eliminates the need for cleaning long pipes, such as when changing colors in a fixed paint supply device.
Therefore, the color change paint loss can be significantly reduced, and the efficiency of the color change operation can be increased.

As described above, in the coating apparatus of the present invention, the supply source of the paint to be supplied to one coating gun can be selected according to the production situation, and as described above, the production efficiency and the paint loss reduction are reduced. Two effects can be easily obtained. In addition, since it is not necessary to have both a coating apparatus for mass production and a coating apparatus for small-quantity multi-products, it is possible to reduce equipment costs.

Next, as in the second aspect of the present invention, the coating gun is provided with a feed tube having a double pipe structure composed of an inner pipe and an outer pipe opened toward the spraying means. A paint nozzle for discharging paint is provided at the tip of the cartridge-type paint supply device, and the fixed paint is provided in an intermediate hole between the inner tube and the outer tube in the feed tube. It is preferable that a supply device is connected, while an inner hole in the inner pipe is provided so that the paint nozzle of the cartridge type paint supply device can be inserted and arranged.

In this case, while the paint supply path from the fixed paint supply device is secured by the intermediate hole, the paint supply route from the cartridge paint supply device is easily secured by the inner hole inside. And each paint supply path can be dedicated. for that reason,
The two paint supply sources can be selected at any time, and the cleaning work when switching between them can be eliminated.

The cartridge type paint supply device has the paint nozzle. Therefore, the cartridge-type paint supply device can be easily attached and detached by inserting the cartridge-type paint supply device into the inner hole. Further, the paint can be supplied directly to the spraying means from the paint nozzle. Therefore, it is not necessary to clean the feed tube when replacing the cartridge type paint supply device at the time of color change, and it is possible to further streamline the color change operation.

Further, it is preferable that the coating gun is provided with a mounting portion for mounting the cartridge type coating material supply device in the axial direction rearward of the feed tube. In this case, the cartridge-type paint supply device having a paint nozzle at the tip is advanced and retracted on the rear side of the feed tube on the axis.
This can be easily attached and detached.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment A coating apparatus according to an embodiment of the present invention will be described with reference to FIGS. The coating apparatus 1 of the present embodiment is an embodiment applied to a rotary atomizing electrostatic coating machine, and as shown in FIGS. 1 and 2, a coating gun 10 having a spraying means 11 for spraying a paint, It has a fixed paint supply device 4 (FIG. 2) fixedly connected to the coating gun 10 and a cartridge type paint supply device 5 which is detachably mounted on the coating gun 10. Further, the supply of the paint to the spraying means 11 is performed from either the fixed paint supply device 4 or the cartridge paint supply device 5.

Hereinafter, this will be described in detail. As shown in FIG. 1, the coating gun 10 is provided with a bell cup 11 which is rotated by an air motor 12 at the tip thereof as the spraying means, and the feed tube 2 is provided toward the bell cup 11.

As shown in FIG. 1, the air motor 12 has a rotating shaft 121 provided in a motor case 120 with a bearing 124 interposed therebetween. The motor case 12
The turbine 123 connected to the rear end of the rotating shaft portion 121 is disposed in the turbine chamber 125 of No. 0. An air supply path 129 for introducing air serving as a drive source of the turbine 123 is connected to the turbine chamber 125. The tip of the rotating shaft 121 is a bell cup 11.
To transmit the rotation of the turbine 123 to the bell cup 11.

The rotating shaft 121 has a cylindrical shape having a hollow portion. The feed tube 2 is provided in the hollow portion. As shown in FIGS. 2 and 3, the feed tube 2 has a double tube structure including an inner tube 21 and an outer tube 22 that open toward the bell cup 11 as a spraying unit.

The inner tube 21 and the outer tube 22 are connected to a donut-shaped paint reservoir 30 at their rear ends. The paint reservoir 30 is provided in communication with an intermediate hole 31 between the inner pipe 21 and the outer pipe 22, and
It is connected to the pipe 40 of the fixed paint supply device 4.

The inner tube 21 has an inner hole 32 having a diameter slightly larger than that of a paint nozzle 51 of a cartridge type paint supply device 5 described later, and is provided so that the paint nozzle 51 can be inserted smoothly. Further, as shown in FIG. 1, a mounting portion 15 for mounting the cartridge type paint supply device 5 is provided behind the feed tube 2 in the axial direction. The mounting portion 15 is provided with a fixing device 16 for fixing a cartridge type paint supply device 5 described later. The fixing device 16 uses the spring 16
It is of the type pressed by 2.

The coating gun 10 is provided with a high-voltage generator (not shown) for applying a charge to the paint in order to perform electrostatic coating.

As shown in FIG. 4, the cartridge type paint supply device 5 has a cylindrical main body 50 and a paint nozzle 51 provided at the end thereof. The main body 5
0, a hose 5 for supplying a thinner for generating a paint discharge pressure from a thinner supply source 58 (FIG. 2).
9 are provided.

At the tip of the paint nozzle 51, a check valve 52 is provided. The inside of the main body 50 is partitioned into a paint chamber 54 and a pressure chamber 55 by a partition plate 53. Paint is stored in the paint chamber 54, and thinner is supplied to the pressurized chamber 55 from the hose 59. Then, by supplying thinner to the pressurizing chamber 55, the partition plate 53 is pressurized and advanced, whereby the paint is discharged from the tip of the paint nozzle 51 against the check valve 52.

As shown in FIG. 2, the fixed paint supply device 4 connected to the intermediate hole 31 between the inner tube 21 and the outer tube 22 of the feed tube 2, that is, the paint reservoir 30, comprises a plurality of It has a color changing valve 41 connected to the paint tank 8. The color changing valve 41 is connected to the paint reservoir 30 by the pipe 40.

Next, the operation of the present embodiment will be described. When performing a coating operation using the coating apparatus 1 of this example, if the operation is mass production, the operation is performed by receiving the supply of the paint from the fixed paint supply apparatus 4. Specifically, a predetermined paint is sequentially supplied from the color changing valve 41 of the fixed paint supply device 4 to the paint reservoir 30, and is discharged from the intermediate hole 31 of the feed tube 2 toward the bell cup 11. . At this time, the paint supplied from the fixed paint supply device 4 is sprayed by rotating the bell cup 11 by the air motor 12. Thus, during mass production, by supplying the paint to the coating gun 10 from the fixed paint supply device 4, a large amount of paint can be continuously supplied, thereby continuing the painting work with high efficiency. be able to.

When frequent color change is required for multi-product small-quantity production, the paint supply from the cartridge type paint supply device 5 is performed. If the color needs to be changed, the cartridge is replaced with another cartridge-type paint supply device 5 that stores paints of different colors. As a result, the loss of color change paint can be greatly reduced as compared with the case where color change is performed in the fixed paint supply device 4.

Further, the feed tube 2 has a double pipe structure, the intermediate hole 31 is a paint supply path from the fixed paint supply device 4, and the inner hole 32 inside is a cartridge type paint supply. It becomes a paint supply route from the device 5,
Each paint supply path can be dedicated. Therefore, it is extremely easy to switch between the two paint supply sources, and at the time of switching from the fixed paint supply device 4 to the cartridge paint supply device 5 or vice versa, there is no need to clean the feed tube 2 at all. Becomes

The cartridge type paint supply device 5 of this embodiment has the paint nozzle 51 described above. For this reason, by allowing this to be inserted and arranged in the inner hole 32, the paint can be supplied directly from the paint nozzle 51 to the spraying means 11. Therefore, the cartridge type paint supply device 5
At the time of use, it is not necessary to clean the inner hole 32 of the feed tube 2 when replacing the cartridge type paint supply device 5, and the color change operation can be further streamlined.

As described above, in the coating apparatus 1 of this embodiment, the supply source of the paint to be supplied to one coating gun can be selected according to the production situation, and as described above, the production efficiency and the paint loss reduction are achieved. The two effects described above can be easily obtained. In addition, since it is not necessary to have both a coating apparatus for mass production and a coating apparatus for small-quantity multi-products, it is possible to reduce equipment costs.

[0034]

As described above, it is possible to provide a coating apparatus that can cope with both mass production and small-quantity multi-product production, and that can reduce the loss of color change paint and improve productivity.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a coating gun in an embodiment.

FIG. 2 is an explanatory diagram showing a configuration of a main part of a coating apparatus in the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram showing a configuration of a cartridge type paint supply device in the embodiment.

FIG. 5 is an explanatory view showing a configuration of a coating gun in a conventional example.

[Explanation of symbols]

 1. . . Coating equipment, 10. . . 10. paint gun, . . 11. spraying means (bell cup); . . Air motor, 2. . . Feed tube, 21. . . Inner tube, 22. . . Outer tube, 31. . . Middle hole 32. . . 3. inner hole, . . 40. fixed paint supply device, . . Plumbing, 5. . . Cartridge type paint supply device, 51. . . Paint nozzle,

Claims (3)

[Claims] 1. A paint gun having a spraying means for spraying paint, a fixed paint supply device fixedly connected to the paint gun, and a cartridge type paint supply device detachably mounted on the paint gun. And a supply of paint to the spraying means is performed from either the fixed paint supply device or the cartridge paint supply device. 2. The coating gun according to claim 1, wherein:
A feed tube having a double pipe structure comprising an inner pipe and an outer pipe opened toward the spraying means is provided, and a paint nozzle for discharging paint is provided at a tip of the cartridge type paint supply apparatus. The fixed paint supply device is connected to an intermediate hole in the feed tube between the inner tube and the outer tube, while the inner hole in the inner tube is connected to the cartridge type paint supply device. A coating apparatus, characterized in that the coating nozzle is provided so as to be insertable. 3. The coating gun according to claim 2, wherein:
A coating device, further comprising: a mounting portion for mounting the cartridge type coating material supply device at an axial rear side of the feed tube.