JP2000317357A - Coating device and coating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the sticking of charged coating particles to an electrostatic coating gun and a robot and at the same time, reduce the length of a coating equipment by providing a mobile robot equipped with an electrostatic coating gun and a barlike electrode which is arranged on both sides of the orbit of the electrostatic coating gun and repels the charged coating particles to be discharged from the gun. SOLUTION: An electrostatic coating gun 11 applies high voltage generated by a high voltage generator 14 to a bell head 11a through a rotating shaft. A robot 12 to which the electrostatic coating gun 11 can be fitted is equipped with a traveling shaft 12a extending in the linear direction A, an arm 12b which is fitted to the traveling shaft 12a and has the gun 11 mounted on the tip and a drive device which moves the arm 12b along the traveling shaft 12a. The barlike electrode 13 is provided on the side of the gun 11 and receives the high voltage from a high voltage generator 16 to repel charged coating particles. In addition, the barlike electrode 13 is movable by a cylinder 17, so that it is possible to avoid a coating mist scattered around the barlike electrode 13 even when the gun 11 is moved forward/backward B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a coating apparatus and a coating facility.

[0002]

2. Description of the Related Art Coating particles discharged from a bell type electrostatic gun are
For example, there has been known an electrostatic coating method in which a negatively charged object is charged and a charged coating particle is efficiently applied to a grounded object to be coated. However, in the electrostatic coating, the charged coating particles may adhere to a grounded coating booth wall surface, and thereafter, the coating material may fall from the coating booth wall surface to the object to be coated, resulting in defective coating. Therefore, the actual opening 61-40166
As shown in FIG. 6, the coating booth wall surface 61 is covered with a negatively charged charging plate 62, as shown in FIG. 6, to prevent the negatively charged coating particles from scattering toward the coating booth wall surface. However, a coating apparatus capable of preventing the coating particles from adhering to the wall of the coating booth is disclosed.

[0003]

However, in the conventional apparatus, the adhesion of the charged coating particles to the bell-shaped electrostatic gun and the robot having the bell-shaped electrostatic gun is not suppressed, and the bell-shaped electrostatic gun and the bell-shaped electrostatic gun are not controlled. The paint adhered to the robot equipped with the electrostatic gun may drip on the object to be coated, resulting in defective coating.
Therefore, when a plurality of robots equipped with bell-shaped electrostatic guns are arranged side by side, the distance between adjacent robots is reduced in order to reduce the adhesion of paint mist to adjacent bell-shaped electrostatic guns and robots. Needs to be large. From the viewpoint of equipment cost, it is desired that the coating equipment be as small as possible. However, in the conventional apparatus, the distance between the robots is large, so that the coating equipment becomes long.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a coating apparatus capable of suppressing the adhesion of charged coating particles to an electrostatic coating gun and a robot, and a coating apparatus which can be shorter than conventional coating equipment.

[0004]

The present invention that achieves the above object is as follows. (1) An electrostatic coating gun, a robot equipped with the electrostatic coating gun and moving in a linear direction, and discharged from the electrostatic coating gun disposed on both sides of the trajectory along the trajectory of the electrostatic coating gun. And a rod-shaped electrode for repelling charged coating particles. (2) an electrostatic coating gun, a robot having the electrostatic coating gun and moving in a linear direction, and discharging from the electrostatic coating gun disposed on both sides of the trajectory along the trajectory of the electrostatic coating gun. Coating equipment, comprising: a plurality of coating apparatuses each including a rod-shaped electrode for repelling charged coating particles.

[0005] In the coating apparatus of the above (1), the rod-shaped electrodes are arranged on both sides of the locus along the locus of the electrostatic coating gun provided in the robot and moved by the robot.
Therefore, when the electrostatic coating gun ejects the coating particles while moving in a linear direction by the robot, the charged coating particles are suppressed from being scattered to both sides and the rear of the trajectory of the electrostatic coating gun by the rod-shaped electrodes, Adhesion of the charged coating particles to the electrostatic coating gun and the robot is suppressed. In the coating equipment of the above (2), a plurality of coating apparatuses in which rod-shaped electrodes are arranged on both sides of the trajectory are arranged along the trajectory of the electrostatic coating gun provided in the robot and moved by the robot. The charged coating particles discharged from the electrostatic coating gun are
Since the scattering of the trajectory of the electrostatic coating gun to both sides and the rear is suppressed, and the adhesion of the charged coating particles to the electrostatic coating gun and the robot is suppressed, each coating device can be arranged close to each other. This makes it possible to shorten the coating equipment as compared with a conventional coating equipment in which a plurality of coating devices are arranged side by side.

[0006]

1 is a side view of a coating apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the coating apparatus according to the embodiment of the present invention, and FIG. 3 is a rod-shaped electrode of the coating apparatus according to the embodiment of the present invention. FIG. 4 is a schematic view of a coating facility in which the coating apparatus of the embodiment of the present invention is arranged, and FIG. 5 is a front view of the coating facility of FIG.

First, a coating apparatus included in a coating facility according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1 and FIG.
And a robot 12 to which the electrostatic coating gun 11 is attached
And a rod-shaped electrode 13.

The electrostatic coating gun 11 is, for example, a rotary atomizing electrostatic coating gun or an air electrostatic coating gun. In the embodiment of the present invention, a bell type electrostatic gun which is a rotary atomizing electrostatic coating gun will be described as an example. The bell-type electrostatic gun 11 is connected to a bell head 11a and a bell head 11a.
1a is provided. A high voltage generator 14 is provided inside or outside the bell type electrostatic gun. The high voltage generated by the high voltage generator 14 is applied to the bell head 11a via a rotating shaft. Therefore, at the time of coating, the coating particles scattered from the bell head 11a are charged.

The robot 12 to which the electrostatic coating gun 11 can be attached includes a reciprocating type painting robot, an articulated type painting robot, and the like. In the embodiment of the present invention, an example of the reciprocating type painting robot will be described. The reciprocating type painting robot 12
As shown in FIG. 1, a traveling shaft 12a extending in a linear direction,
A bell-shaped electrostatic gun 11 attached to the traveling shaft 12a
The arm 12b has a detachable arm 12b, and a drive device (not shown) for moving the arm 12b along the traveling axis 12a. When the arm 12b attaches the bell-shaped electrostatic gun 11 and moves in a linear direction along the traveling axis 12a, the bell-shaped electrostatic gun 11 moves in a linear direction, and in FIG. The traveling shaft 12a and the driving device are arranged in a case 12c provided outside the outer wall 15a of the painting booth 15 where painting is performed. Arm 12b
The tip portion on the bell-shaped electrostatic gun mounting side is located in the coating booth 15. Since the arm 12b is movable in the linear direction, the outer wall 15a of the painting booth 15 is provided with a hole extending in the linear direction for the arm 12b to move freely.

In addition to driving the arm 12b in a linear direction, the arm 12b may be driven in an advancing / retreating direction (a direction approaching / separating from the surface to be coated) B. Thereby, the movement of the bell type electrostatic gun 11 in the reciprocating direction becomes possible.

Further, the front end of the arm 12b may be pivotable about the axis O with respect to the rear end attached to the traveling shaft 12a. Thereby, the bell type electrostatic gun 1
1 can be swung.

The rod-shaped electrode 13 is a bell-shaped electrostatic gun 11 which is moved in a linear direction by a reciprocating type painting robot 12.
Are provided on the sides of the bell-shaped electrostatic gun 11 on both sides of the locus, as shown in FIG. The rod-shaped electrodes 13 are arranged in a single row or in a plurality of rows such as two rows as shown in FIG. The rod-shaped electrode 13 is supplied with a high voltage from the high voltage generator 16 and has a characteristic of repelling the charged coating particles. The voltage supplied to the rod-shaped electrode 13 is equal to or higher than the voltage (for example, −40 to −90 KV) supplied to the bell-type electrostatic coating gun 11. The rod-shaped electrode 13 is made of a semiconductive resin (PEEK, nylon, or the like) having a resistance of 10 MΩ to 1 GΩ. Alternatively, as shown in FIG. 3, the central portion 13a is made of an insulating material, for example, a ceramic material or a resin material, and the surface 13b is covered with a semiconductive resin.

When the arm 12b is driven in the forward / backward direction B, the rod-shaped electrode 13 can also be driven in the forward / backward direction B. For example, as shown in FIGS.
Are supported by the cylinder 17 and the cylinder 17 is driven in the forward / backward direction B, so that the rod-shaped electrode 13 is driven in the forward / backward direction B.

In order to prevent the paint from flowing out of the holes provided in the outer wall 15a of the coating booth 15, as shown in FIG. Is provided between the bell-shaped electrostatic gun 11 and a hole in the painting booth outer wall 15a.

The coating apparatus 10 according to the embodiment of the present invention includes rod-shaped electrodes 13 on both sides of the locus of movement of the bell-shaped electrostatic gun 11 in the linear direction A, and the rod-shaped electrodes 13 are supplied to the bell-shaped electrostatic gun 11. Thus, even if the bell-shaped electrostatic gun 11 moves in a linear direction, the paint mist can always be suppressed from scattering in the left-right direction and behind the bell-shaped electrostatic gun 11. Further, since the rod-shaped electrode 13 is moved by the cylinder 17, even if the bell-shaped electrostatic gun 11 moves in the reciprocating direction B, it is possible to always suppress the scattering of the paint mist in the left-right direction and the rear of the bell-shaped electrostatic gun. . Further, the coating efficiency is increased, the coating cost is reduced, and the amount of organic solvent discharged is reduced. Further, since the rod-shaped electrode has a semiconductive material at least on its surface, even if an earthing object approaches, the discharge energy is small, and safety is ensured.

Next, with reference to FIGS. 4 and 5, the configuration of a coating facility in which the coating apparatus of the embodiment of the present invention is disposed will be described.
explain. The coating equipment shown in FIGS. 4 and 5 is an example of the coating equipment for coating the automobile 50. The car 50
It is transported by the carriage 51. The cart 51 is the painting booth 1
5 is grounded. The painting equipment 20 is a car 50
In the transport direction C. In the coating equipment 20, a zone X where the inner and outer plate surfaces of the door of the automobile are coated with a metallic paint and a zone Y where a clear paint is coated are arranged in the transport direction.

Both the zone X where the metallic paint is applied and the zone Y where the clear paint is applied are provided with a traveling shaft for coating the door inner plate portion at a position facing each other in a direction perpendicular to the conveying direction from the upstream side. Articulated robot 30
The above-mentioned coating apparatus 1 for coating both sides of the outer plate one by one
Coating equipment 4 for painting the upper surface of the outer plate with three units on each side
0 are arranged in order.

The articulated robot 30 with a traveling axis includes a base 31, a vertical arm (not shown) extending from the base 31, and a horizontal arm 32 attached to the vertical arm, and a bell-shaped electrostatic gun is attached to the tip of the horizontal arm 32. . The base 31 is movable along a rail extending in the transport direction. Since the base 31 and the vertical arm are arranged outside the outer wall 15a of the painting booth 15, the horizontal arm 32 and the bell-shaped electrostatic gun are located in the painting booth.

As shown in FIG. 5, the coating apparatus 40 for coating the upper surface of the outer panel includes an arm 41 extending from a side wall of the coating booth into the coating booth in a direction perpendicular to the conveying direction, and a case 42 containing a driving device. A reciprocating type painting robot, a bell type electrostatic gun unit 43 having a plurality (three in FIG. 5) of bell type electrostatic guns attached to the arm 41 movably along the direction in which the arm 41 extends, A rod-shaped electrode 44 extending in parallel with the direction in which the arm 41 extends. The bell type electrostatic gun unit 43 moves right and left along the arm 41. Further, the arm 41 can be driven up and down by a driving device, and the bell type electrostatic gun unit 43 can be moved up and down. Note that the bell-shaped electrostatic gun unit 43 may be configured such that each of the bell-shaped electrostatic guns is independently driven instead of being driven integrally with a plurality of bell-shaped electrostatic guns. The rod-shaped electrode 44 is
1 and a single row or a plurality of rows are arranged on both sides of the arm 41 (on the front side and the rear side of the arm).
Accordingly, the rod-shaped electrode 44 moves up and down with the up and down driving of the arm 41.

A coating apparatus 1 for coating both side surfaces of an automobile outer panel.
0 is provided with the rod-shaped electrode 13 so that the paint mist can be prevented from scattering in the left-right direction and the rear of the bell-shaped electrostatic gun 11,
When the coating apparatuses 10 are arranged side by side, the distance between the adjacent coating apparatuses 10 can be shortened. Therefore, the length of the coating equipment 20 in the transport direction C can be shortened. Further, the coating device 40 for coating the upper surface of the automobile outer panel also includes the rod-shaped electrode 44 and suppresses the dispersion of the paint mist, so that the coating device 10 located on the upstream side of the coating device 40 and the coating device 10 located on the downstream side The distance from the joint type painting robot 30 can be shortened. Therefore, the coating apparatuses 10 and 40 and the coating robot 30 can be arranged close to each other, and the length of the coating equipment 20 in the transport direction C can be further reduced. Since the coating equipment 20 can be shortened (smaller), effects such as reduction in equipment cost and energy required for air conditioning can be obtained. In addition, since dirt on the outer wall, floor, robot, and coating gun of the coating booth is reduced, the frequency of cleaning can be significantly reduced.

[0021]

According to the first aspect of the present invention, the rod electrodes are arranged on both sides of the locus along the locus of the electrostatic coating gun provided in the robot and moved by the robot. For this reason, the charged coating particles discharged from the electrostatic coating gun that moves in a linear direction by the robot are repelled by the rod-shaped electrodes and scattered behind the rod-shaped electrodes, and the charged coating particles discharged to the electrostatic coating gun and the robot are repelled. Is suppressed. According to the coating equipment of the second aspect, a plurality of coating apparatuses having rod-shaped electrodes arranged on both sides of the trajectory are arranged along the trajectory of the electrostatic coating gun provided on the robot and moved by the robot. The charged coating particles discharged from the electrostatic coating gun are suppressed from scattering behind the rod-shaped electrode,
Since the paint mist is prevented from scattering to the left, right, and rear of the electrostatic coating gun, each coating device can be arranged close to each other. Thereby, the coating equipment can be shortened as compared with a coating equipment in which a plurality of conventional coating apparatuses are arranged side by side.

[Brief description of the drawings]

FIG. 1 is a side view of a coating apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the coating apparatus according to the embodiment of the present invention.

FIG. 3 is a side view of a rod-shaped electrode of the coating apparatus according to the embodiment of the present invention.

FIG. 4 is a schematic diagram of a coating facility in which a coating apparatus according to an embodiment of the present invention is arranged.

FIG. 5 is a front view of the coating equipment of FIG.

FIG. 6 is a front view of a conventional coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coating apparatus 11 Electrostatic coating gun 12 Robot 13 Rod electrode 20 Coating equipment

Claims (2)

[Claims] 1. An electrostatic coating gun, a robot including the electrostatic coating gun, and moving in a linear direction, and an electrostatic coating gun disposed on both sides of the trajectory along the trajectory of the electrostatic coating gun. A rod-shaped electrode for repelling the discharged charged coating particles. 2. An electrostatic coating gun, a robot having the electrostatic coating gun and moving in a linear direction, and an electrostatic coating gun disposed on both sides of the trajectory along the trajectory of the electrostatic coating gun. Coating equipment comprising a plurality of coating devices each including a rod-shaped electrode for repelling discharged charged coating particles.