JP3013734B2 - Rotary atomizing electrostatic coating device, method of mounting paint tank unit on coating gun body of rotary atomizing electrostatic coating device, and paint tank unit of rotary atomizing electrostatic coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cleaning thinner when changing colors, wash amount of less able rotary atomizing electrostatic coating apparatus of the paint, and the paint to the rotary atomizing coating gun body of the electrostatic coating apparatus
The present invention relates to a method of mounting a paint tank unit and a paint tank unit of a rotary atomizing electrostatic coating device.

[0002]

2. Description of the Related Art In an automobile production plant, a body, a bumper, and the like are painted using a painting robot. In this case, one painting robot holds one painting gun, and every time the paint color of the body or bumper changes, the painting gun and the inside of the paint path are washed to prevent color mixing. Therefore, the amount of the cleaning thinner and the amount of the paint remaining in the paint path to be washed away are large, which is uneconomical. As a countermeasure, JP-A-6-134354 discloses that a coating gun is provided with a plurality of paint nozzles, paint is supplied to a bell head through a dedicated route for each paint color, and the paint route is not washed for each color change. We have proposed a rotary atomizing electrostatic coating device that reduces the amount of cleaning thinner and the amount of paint to be washed away.

[0003]

However, the above prior art has a problem in that the number of paint supply nozzles that can be arranged in one painting gun is limited, and it is not possible to cope with an increase in the number of paint colors. there were. In addition, paint sprayed from the paint supply nozzle located radially away from the axis of the paint gun does not hit the center of the nozzle-facing wall of the bell head. There were also problems such as becoming. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary atomizing electrostatic coating apparatus and a rotary atomizing electrostatic coating apparatus which can reduce the amount of cleaning thinner and wash-off paint at the time of color change and can cope with an increase in the number of coating colors. An object of the present invention is to provide a method of mounting a paint tank unit on a gun body and a paint tank unit of a rotary atomizing electrostatic coating device.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, a rotary atomizing electrostatic coating apparatus of the present invention, a method of mounting a paint tank unit on a coating gun body of the rotary atomizing electrostatic coating apparatus, and a rotary atomizing apparatus. The paint tank unit of the electrostatic coating device is as follows. (1) A paint gun body having a bell head and a washing nozzle, a paint tank containing a paint constant supply means, and a paint nozzle extending from the paint tank toward the bell head are configured to be separable from the paint gun body. A rotary atomizing electrostatic coating apparatus comprising: a paint tank unit detachably mounted on a coating gun body. (2) an axis of the paint nozzle of the paint tank unit is located on an extension of an axis of the bell head;
The rotary atomizing electrostatic coating apparatus according to (1). (3) There is provided a placement table for placing the paint tank unit detached from the coating gun body, and a paint circulation pipe for supplying paint to the paint tank unit placed on the placement table (1) or (2). ). (4) A paint tank unit which is detachable from the coating gun body and has a paint nozzle in a paint tank having a built-in paint quantitative supply means, such that the paint nozzle is positioned on an extension of the axis of a bell head of the coating gun body. A method for mounting a paint tank unit on a coating gun body of a rotary atomizing electrostatic coating apparatus, wherein the coating tank unit is mounted on the coating gun body from behind. (5) A paint tank having a built-in paint quantitative supply means, and a paint provided in the paint tank so as to extend toward the bell head of the coating gun body and to have the axis located on the extension of the axis of the bell head. A coating tank unit for a rotary atomizing electrostatic coating device, comprising: a nozzle;

[0005]

According to the present invention, there is provided a rotary atomizing electrostatic coating apparatus of the present invention and a coating tank unit to the coating gun body of the rotary atomizing electrostatic coating apparatus.
In the method of attaching the paint tank and the paint tank unit of the rotary atomizing electrostatic coating device, the color is changed together with the paint tank unit. Therefore, the remaining paint in the paint supply path including the paint nozzle is not washed off and not washed by the thinner, and the amount of the washed-out paint and the thinner are drastically reduced. In addition, one paint tank unit is installed in one paint gun, and one paint tank unit has only one paint nozzle. Therefore, the number of paint colors is limited by the arrangement space of paint nozzles. However, the number of paint colors can be freely increased. Furthermore, the paint nozzle of the paint tank unit mounted on the paint gun can be arranged on the paint gun axis, and the trouble that occurs when the paint nozzle is displaced from the axis does not occur.

[0006]

1 to 9 show a preferred embodiment of the present invention. As shown in FIG. 1, a rotary atomizing electrostatic coating apparatus according to an embodiment of the present invention includes a coating gun 1, a coating robot 2 for holding and moving the coating gun 1, a thinner for the coating gun 1, and an air supply hose. , Electric wires and cables. Painting gun 1
Is attached to the wrist 34 ′ of the painting robot 2. As shown in FIGS. 1 and 2, the coating gun 1 is composed of two parts that can be separated from each other. One of the two parts is a bell head 5 and a cleaning nozzle 1
0 is a paint gun body 3 with the other one being a paint nozzle 1
1 and a paint tank unit 4 (a unit shown in FIG. 2) including a paint tank 12. The coating gun 1 is held by the coating robot 2 at the site of the coating gun body 3, and the coating tank unit 4 is configured as a cartridge type and is detachably mounted on the coating gun body 3. A paint tank unit 4 is prepared for each paint color, and the paint tank unit 4 is replaced when the color is changed. One paint tank unit 4 has one paint nozzle 11 and one paint tank 12. One paint nozzle 11 is provided in the paint tank unit such that when the paint tank unit 4 is attached to the coating gun body 3, the paint nozzle axis is positioned on an extension of the axis of the bell head 5. The paint tank 12 of the paint tank unit 4 has a paint constant supply means 13.

The coating gun body 3 has a built-in air motor 35, and a bell head 5 is screwed to the tip of the air motor 35 to atomize the paint. The paint pattern of the atomized paint is controlled by the shaping air injection unit 6. The shaping air injection unit 6 and the bell head 5
In order to prevent the occurrence of electrostatic spark even at the time of malfunction, a semiconductive material (having a resistance of 10 to 1000
(Approximately MΩ). The air motor 35 includes a rotating shaft 14, a radial air bearing portion 15 that rotatably supports the rotating shaft 14, a thrust air bearing portion 16, a turbine portion 17 that drives the rotating shaft 14 to rotate, and the like. The outer peripheral portion 7 of the air motor 35 of the coating gun body 3 is made of an electrically insulating resin, has a T-shaped structure, and has a robot wrist portion 34 '.
Is held in. A high voltage generator 8 is built in the outer peripheral portion 7 of the insulating resin, and a high voltage of about 30 to 100 KV is applied to the air motor 35 and the bell head 5 via a high voltage cable 9. The high voltage generator 8 includes a low voltage power supply (0
-24V) 27 via a low voltage cable 28.

[0008] Inside the air motor 35, a cleaning thinner having a double pipe structure and a cleaning nozzle 1 for supplying cleaning air.
0 is provided. As shown in FIG. 4, the cleaning nozzle 10 has a structure in which the paint nozzle 11 of the paint tank unit 4 is inserted from behind the insulating resin part 7, and a thinner between the inner and outer tubes of the cleaning nozzle 10. And air are supplied. When the paint nozzle 11 is inserted into the washing nozzle 10, the tip of the paint nozzle 11 protrudes from the tip of the washing nozzle 10 so that the thinner does not enter the paint nozzle 11. Cleaning nozzle 10
The thinner and the air are alternately supplied from the thinner and the air passage 31 between the double pipes. The thinner and the air are supplied to the passage 31 from the thinner hose 32 and the air hose 33 via the valve 39 and the hose 30. Supplied.

The paint tank 12 of the paint tank unit 4
As shown in FIG. 2, a paint chamber 18 having a predetermined volume is provided, and a paint quantitative supply means 13 for pushing out paint in the paint chamber 18 to a paint nozzle 11 by a spool valve is provided. As shown in FIG. 7, the paint constant supply means 13 'also
It may be made of a structure that can be pushed out by the balloon in FIG. The paint tank unit 4 has a high-voltage insulating portion 24 made of a resin material, and is held by the positioning cylinder 25 with respect to the paint gun body 3 at that portion. Positioning cylinder 2
5 has a piston 37 and a spring 38 'as shown in FIG. At the tip of the paint nozzle 11, as shown in FIG.
A check valve 26 made of a spring and a steel ball is provided to prevent the thinner from entering the paint nozzle 11. FIG.
As shown in (1), the paint chamber 18 has a paint supply port 21, and the paint supply port 21 is provided with a check valve comprising a ball 22 and a spring 23.

The paint gun body 3 and the paint tank unit 4 are provided with a paint suction air path 19 and a paint pushing air path 20. When the compressed air is supplied from the paint suction air path 19 and the spool valve is moved in the direction in which the paint chamber 18 expands, the paint is sucked into the paint chamber 18 through the paint supply port 21, and the compressed air is discharged from the paint extrusion air path 20. When the supply and the spool valve are moved in a direction in which the paint chamber 18 is reduced, the paint nozzle 11 is moved from the paint chamber 18.
Is extruded and supplied to the bell head 5. However, the paint is sucked into the paint chamber 18 by removing the paint tank unit 4 from the paint gun body 3 as described later. As shown in FIG. 6, the joint between the paint gun body 3 and the paint tank unit 4 in the paint suction air path 19 and the paint push-out air path 20 has a structure in which airtightness is maintained by a rubber packing 36. .

The paint tank unit 4 removed from the paint gun body 3 is erected on a placement table 34 as shown in FIG. The paint tank units 4a to 4d have different paint colors. In this state, as shown in FIG. 8, the paint tank units 4a to 4d are filled with paint of each color from the paint circulation pipe 37 via the quick joint 38. FIG. 9 shows a paint circulation pipe 37 of any one color.
Shows a paint tank 39 and a pump 40 for supplying paint to the air conditioner. The quick joint 38 is lowered by an air cylinder 41, the quick joint 38 is fitted to the paint supply port 21, and the paint is supplied into the paint chamber 18. .

Next, the operation will be described. Painting robot 2
The paint gun 1 attached to the paint supply tank placement table 3
The robot is moved to the fourth section, and one of the paint tank units 4a, 4b,... (For example, 4a) in the painting order is inserted from behind the painting gun body 3, and the air cylinder 25 is operated and fixed. Next, the painting robot 2 is operated,
The coating gun 1 is moved to the coating site, the spool valve 13 is advanced at a constant speed to push out the coating material, and the coating is performed by spraying from the rotating bell head 5. After painting, double pipe washing nozzle 10
The cleaning head and the paint nozzle 11 are washed by alternately spraying a cleaning thinner and air. After that, the paint gun 1 is transferred to the paint tank unit placement table 34 again.
, The used paint tank unit 4a is returned to the placement table 34, the next paint color paint tank unit 4b is taken, and the same operation as above is repeated. In the above cleaning, it is not necessary to clean the inside of the paint nozzle 11 only by replacing the paint tank unit 4 of the cartridge type.
Further, since there is no need to wash away the paint remaining inside the paint nozzle 11 at the time of the color change, the amount of the thinner to be washed at the time of the color change is small, and there is no paint loss.

[0013]

According to the present invention, a rotary atomizing electrostatic coating apparatus has a coating gun main body and a coating tank unit detachable from the coating gun main body and detachable from the coating gun main body. Therefore, it is not necessary to wash the inside of the paint supply path including the paint nozzle at the time of color change, and it is not necessary to wash away the paint remaining in the paint nozzle. Therefore, it is possible to reduce the amount of the cleaning thinner and the amount of the wash-off paint. In addition, since the entire paint tank unit is replaced, there is no need to provide multiple paint nozzles on the paint gun, and even if the number of paint colors increases, there is no restriction on the space where paint nozzles can be placed. Can freely respond to the increase.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary atomizing electrostatic coating apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a paint tank unit in FIG.

FIG. 3 is a front view of a case where a plurality of paint tank units are arranged on an arrangement table.

FIG. 4 is a sectional view when a paint tank unit is inserted into a cleaning nozzle.

FIG. 5 is a sectional view of a cylinder for fixing a paint tank unit to a paint gun body.

FIG. 6 is a sectional view of a connection portion of an air passage for operating a paint tank unit.

FIG. 7 is a sectional view showing another example of the paint supply means of the paint tank unit.

FIG. 8 is a system diagram of a system for filling a paint tank unit with paint.

FIG. 9 is a system diagram showing one color system in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Painting gun 2 Painting robot 3 Painting gun main body 4 Paint tank unit 5 Bell head 8 High voltage generator 10 Cleaning nozzle 11 Paint nozzle 12 Paint tank 13 Paint quantitative supply means 18 Paint room

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isamu Yamazaki 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Kengo 1 Toyota City Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation ( 58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 5/04 B05B 5/16

Claims (5)

(57) [Claims] 1. A paint gun main body having a bell head and a cleaning nozzle, a paint tank having a paint quantitative supply means built therein, and a paint nozzle extending from the paint tank toward the bell head, being separable from the paint gun body. And a paint tank unit detachably mounted on the coating gun body. 2. The rotary atomizing electrostatic coating apparatus according to claim 1, wherein an axis of said coating nozzle of said coating tank unit is located on an extension of an axis of said bell head. 3. The apparatus according to claim 1, further comprising: a placement table on which the paint tank unit detached from the coating gun main body is placed, and a paint circulation pipe for supplying paint to the paint tank unit placed on the placement table. The rotary atomizing electrostatic coating apparatus according to claim 2. 4. A paint tank unit having a paint nozzle which is detachable from a paint gun main body and has a built-in paint quantitative supply means, and a paint tank unit is provided on an extension of an axis of a bell head of the paint gun body. The spray tank is attached to the coating gun main body of the rotary atomizing electrostatic coating apparatus characterized by being inserted from behind the coating gun main body.
How to attach a knit . 5. A paint tank having a built-in paint constant supply means, provided in the paint tank so as to extend toward the bell head of the coating gun body and to have the axis located on an extension of the axis of the bell head. Which is detachably mounted on the coating gun body.
Paint tank unit for rotary atomizing electrostatic coating equipment.