JPH09225349A - Rotary atomizing coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in coating quality due to air discharged from a turbine chamber and to obtain high coating quality. SOLUTION: In a rotary atomizing coater 1 in which a rotary shaft 5 in which a rotary atomizing head 3 is fixed to one end side and a turbine 6 is fixed to the other end side is rotated by pressurized air, air discharge pipes 12a, 12 which discharge air which drive the turbine 6 are installed at positions which do not hinder the fluidization of coating atomized from the head 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing type coating apparatus mounted on the tip of a coating robot or the like, and a rotary atomizing apparatus in which a turbine rotated by pressurized air is used as a rotary drive source of a rotary atomizing head. Type improvement of coating equipment.

[0002]

2. Description of the Related Art Conventionally, as a rotary atomizing type coating apparatus mounted on the tip of a coating robot or the like, Japanese Patent Laid-Open No. 56-1156.
As seen in Japanese Patent Publication No. 52-52, a rotary atomizing head is fixed to one end side, and a turbine is equipped with a rotary shaft fixed to the other end side,
It is known that pressurized air is supplied into a turbine chamber in which the turbine is housed to rotate the rotary atomizing head. In this type of coating apparatus, the exhaust gas in the turbine chamber is directly exhausted to the outside of the apparatus through an exhaust port provided in the main body. Further, the coating work by this type of rotary atomization type coating device is performed in an environment in which the outside air is shut off in the booth. In the booth, for example, when coating a surface to be coated such as an automobile body, an airflow suitable for coating (from the upper side to the lower side) is formed in the booth.

However, when the coating apparatus is brought close to the surface to be coated in the booth, air is exhausted directly from the exhaust port of the coating apparatus to the outside of the apparatus, so that the air is formed around the surface to be coated. There is an inconvenience that disturbs the air flow.

Further, in the coating by the rotary atomizing type coating apparatus of this kind, the spray pattern of the coating is formed by using the pattern air, but when the coating around the door of the automobile body or the inside of the bonnet is performed, The air directly discharged from the exhaust port of the coating device to the outside of the device bounces off to the automobile body, and the spray pattern of the paint is disturbed and the coating film is sagged or scaled.

[0005]

SUMMARY OF THE INVENTION The present invention solves this inconvenience, and the present invention prevents the deterioration of the coating quality due to the influence of the air exhausted from the turbine chamber, and achieves high coating quality by rotary atomization. An object of the present invention is to provide a coating device.

[0006]

In order to achieve the above object, the present invention accommodates a rotary shaft having a rotary atomizing head fixed to one end side and a turbine fixed to the other end side, and the turbine. In the rotary atomizing coating device, the rotary atomizing head is provided with a turbine chamber, an air supply pipe for supplying pressurized air for rotationally driving the turbine into the turbine chamber, and an air discharge port for discharging air from the turbine chamber. An air discharge pipe for discharging the air in the turbine chamber is provided at a position that does not impede the flow of the paint sprayed from the air discharge pipe.

According to the present invention, the air in the turbine chamber is exhausted through the air exhaust pipe connected to the air exhaust port, so that the air in the turbine chamber is formed of the paint sprayed from the rotary atomizing head. It can be discharged to a position that does not impede the flow. Accordingly, for example, when painting around the door of the automobile body or the inside of the bonnet, the exhausted air can be prevented from splashing back to the automobile body.
Further, it is possible to perform the coating in the booth without disturbing the air flow around the surface to be coated, and thus it is possible to obtain high coating quality.

Further, in the present invention, it is preferable that the air discharge pipe is composed of a plurality of flexible tubes.

When increasing the rotational speed of the turbine, the amount of air supplied into the turbine chamber is increased. Along with this, the amount of air exhausted from the turbine chamber also increases.
In this way, in order to smoothly discharge the increased air,
It is conceivable to make the diameter of the air discharge pipe large.
However, this type of rotary atomization type coating device is attached to the tip of a coating robot or the like, and when the robot's wrist or the like is frequently bent during coating, or the robot's movable range is If it is set to be relatively wide, the air discharge pipe may have a large diameter and may be bent or broken.

Therefore, in the present invention, the air discharge pipe is composed of a plurality of flexible tubes. by this,
Even if it is a comparatively thin tube, by providing multiple tubes, it does not reduce the amount of air discharged from the turbine chamber, prevents bending and tearing, and does not hinder the flow of paint sprayed from the rotary atomizing head. Can be discharged into position.

[0011]

An embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory rear view of the present embodiment, FIG.
2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. 1, FIG. 4 is an exploded explanatory view of FIG. 2, and FIG.

A rotary atomizing type coating apparatus 1 according to this embodiment.
Although not shown, is provided in a painting robot in a painting booth for painting an automobile body or the like. As shown in FIGS. 1 and 2, the rotary atomization type coating apparatus 1 includes a joint portion Y at an arm tip portion X of a coating robot (not shown).
2, a cylindrical main body 2 having a rear end portion detachably connected thereto, a rotary atomizing head 3 rotatably exposed at a front end portion of the main body 2, and a main body 2 of the main body 2 as shown in FIG. A rotary atomizing head drive unit 4 that is housed inside and that rotationally drives the rotary atomizing head 3 is provided.

As shown in FIGS. 2 and 3, the rotary atomizing head drive unit 4 has a rotatable rotary shaft 5 to which the rotary atomizing head 3 is fixedly attached at its tip, and a rear end of the rotary shaft. The turbine 6 is provided on the outer circumference on the side, and the turbine chamber 7 is housed so that the turbine 6 is shielded from the outside air. The turbine chamber 7 is fixed to the inner wall of the main body 2 by support bolts 8.

Further, as shown in FIG. 3, an air supply passage 9 for supplying compressed air for supplying air to the turbine chamber 7 to rotationally drive the turbine 6 inside the main body 2 and rotation of the turbine 6. An air exhaust path 10 for exhausting pressurized air from the turbine chamber 7 during driving is provided toward the rear end of the main body 2. As shown in FIG. 1, at the rear end of the main body 2,
A port 11 communicating with the air supply passage 9 and an air exhaust passage 10
And a port 12 communicating with.

The rotary shaft 5 is formed in a hollow shape so as to penetrate therethrough in the axial direction thereof. Inside the rotary shaft 5, a paint supply pipe 14 having a tip opening into the rotary atomizing head 3 is rotated. It is inserted in the shaft 5 in a non-contact state. Further, as shown in FIG. 3, a cleaning liquid supply pipe 15 having a tip opening in the rotary atomizing head 3 in parallel with the paint supply pipe 14 is inserted in the rotary shaft 5 in a non-contact state. Further, as shown in FIGS. 2 and 3, a needle valve 16 for supplying and stopping the paint by the paint supply pipe 14 is inserted into the paint supply pipe 14 so as to be able to move forward and backward.

Paint supply pipe 14 and needle valve 1
6 and the cleaning liquid supply pipe 15 have their rear end portions supported by a block-shaped valve unit 18 which is detachably fixed to the rear end portion of the main body 2 by bolts 17 (see FIG. 1). There is. The valve unit 18 has a structure shown in FIG.
As shown in FIG. 3, a paint supply passage 19 communicating with the paint supply pipe 14 is provided, and a paint supply passage valve drive for switching the color and type of the paint supplied to the paint supply pipe 14 through the paint supply passage 19. A section 20 is provided.
Further, the valve unit 18 is provided with a needle valve drive unit 21 that drives the needle valve 16 to move back and forth.

Then, as shown in FIG. 4, the rotary atomizing head drive unit 4 removes the bracket 22 screwed from the main body 2 to the front end thereof, and further the main body 2 by the support bolts 8.
It can be separated from the front of the main body 2 by releasing the fixation to the main body 2. Similarly, the valve unit 18
Can be separated to the rear of the main body 2 by releasing the fixing of the bolt 17 to the main body 2. In this way, the rotary atomizing type coating apparatus 1 of the present embodiment is configured to be easily maintained.

The rotary atomizing type coating apparatus 1 of the present embodiment
Is an air exhaust passage 10 as shown in FIGS.
Port 12 has a pair of exhaust tubes 12a, 12b
There is provided a connecting member 13 which can be connected in parallel. As a result, the diameter of the exhaust tubes 12a and 12b can be made relatively thin without reducing the exhaust amount. Further, the exhaust tubes 12a and 12b are made of a flexible material, and although not shown, they are located at positions where they do not hinder the flow of the paint sprayed from the rotary atomizing head of the coating booth via the coating robot. It has been extended. This prevents the exhaust tubes 12a and 12b from being broken or broken even if the wrist of the painting robot is repeatedly bent. Further, the pressurized air exhausted from the turbine chamber 7 by the exhaust tubes 12a and 12b is exhausted to a position sufficiently away from the surface to be coated, and the flow of the paint sprayed from the rotary atomizing head 3 and The airflow around the surface to be coated formed by the coating booth is not disturbed by the discharged pressurized air.

[Brief description of drawings]

FIG. 1 is an explanatory rear view of an embodiment of the present invention.

2 is a cross-sectional explanatory view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an exploded explanatory view of FIG.

FIG. 5 is an explanatory sectional view of a main part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotation atomization type coating device, 3 ... Rotation atomization head, 5 ... Rotation shaft, 6 ... Turbine, 7 ... Turbine chamber, 9 ... Air supply path (air supply pipe) 10, 12 ... Air discharge port, 12a , 1
2b ... Exhaust tube (air exhaust tube).

Claims (2)

[Claims] 1. A rotary shaft having a rotary atomizing head fixed to one end side and a turbine fixed to the other end side, a turbine chamber accommodating the turbine, and a pressurization for rotationally driving the turbine in the turbine chamber. In a rotary atomizing coating device equipped with an air supply pipe that supplies air and an air outlet that discharges air from the turbine chamber, the air inside the turbine chamber is placed at a position that does not hinder the flow of paint sprayed from the rotary atomizing head. A rotary atomization type coating device, characterized in that an air discharge pipe for leading out is provided connected to the air discharge port. 2. The rotary atomizing type coating apparatus according to claim 1, wherein the air discharge pipe is composed of a plurality of flexible tubes.