JP3014884B2 - Electrostatic coating equipment for conductive paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-conductive coating machine such as a water-based paint, a slurry paint, a metallic paint, etc., while reciprocating an electrostatic coating machine to which a high voltage is applied in a direction perpendicular to a conveying direction of a workpiece. The present invention relates to an apparatus for electrostatically coating a conductive paint for applying a paint.

[0002]

2. Description of the Related Art When a conductive paint such as a water-based paint is applied by an electrostatic coating machine to which a high voltage has been applied, in order to prevent leakage of the high voltage applied to the electrostatic coating machine, the coating of the coating machine is performed. Since it is necessary to take measures to insulate the paint supply system (Japanese Patent Application Laid-Open Nos. 55-114366 and 56-141869), multicolor electrostatic coating for automotive coating is performed by changing the color of dozens of paints. In the apparatus, it is troublesome that the paint supply pipe, the paint tank, and the like must be insulated for each color paint. For this reason, in automotive painting, electrostatic painting using an insulating resin paint that consumes a large amount of harmful organic solvents is still predominant, and the fact is that the use of non-polluting water-based paint is forgotten. However, recently, the global environmental conservation movement has increased, and the coating industry has been calling for restrictions on the use of organic solvents that generate pollutants such as hydrocarbons.

[0003] For this reason, the applicant of the present invention does not need to take troublesome insulation measures for a paint supply system such as a paint supply pipe and a paint tank even when performing electrostatic coating with a conductive paint such as a water-based paint. Proposed electrostatic coating equipment (Japanese Utility Model No. 4-87)
756). This is because a pump for supplying the conductive paint to the electrostatic coating machine at a predetermined flow rate is installed in an electrically insulated state, and the paint inlet of the pump is connected to a paint supply pipe which is moved forward and backward with respect to the inlet. It is arranged at a position where it is detachably connected to the tip.

Therefore, when a high voltage is not applied to the electrostatic coating machine, the conductive paint is pumped into the pump by connecting the paint inlet of the pump and the paint supply pipe when the high voltage is not applied to the electrostatic coating machine. By keeping the insulation distance between the paint inlet and the paint supply pipe at the time of the applied paint, a high voltage is not applied to the paint supply pipe, etc., and the conductive paint can be painted without taking troublesome insulation measures. it can.

[0005]

[SUMMARY OF THE INVENTION However, for example in automotive coatings, etc., since the electrostatic coating machine performing coating while reciprocating, taking into account the distance of reciprocating movement of the electrostatic coating machine, an electrostatic coating machine Must be connected to the pump that supplies the conductive paint with a flexible and long paint hose, which increases the distance of the paint hose to the electrostatic coating machine. In addition to the time required for cleaning, there is a problem that a large amount of residual paint is wasted. Further, since the paint hose must be flexible, it is inferior in strength, and it is troublesome to regularly check the degree of fatigue caused by the reciprocating movement of the electrostatic coating machine.

Furthermore, a long insulation distance (at least 30 cm) is required to disengage the paint inlet from the paint supply pipe end.
As described above, a separate drive device such as a large cylinder that can be extended and contracted is required separately, which not only increases the equipment cost, but also makes it difficult to accurately position and disengage the distal end. Therefore, the present invention enables the electrostatic coating machine to reciprocate without using a flexible paint hose, shortens the piping to the electrostatic coating machine, reduces wasted residual paint, and reduces the cleaning time. It is a technical object to reduce the size of the device and to reduce the size of the entire device.

[0007]

SUMMARY OF THE INVENTION To solve this problem, the present invention relates to an electrostatic coating machine to which a high voltage is applied.
Guide to perform painting while reciprocating by attaching to the locator
Filling conductive paint in the electrostatic paint coating equipment
Pump to supply to the electrostatic coating machine
In addition to being provided integrally, conductive paint is applied to the pump.
A paint supply pipe for supplying is disposed on the reciprocator,
The tip of the paint inlet of the pump and the pipe end of the paint supply pipe
Form couplers that are detachably connected to each other
The coupler at the paint inlet is connected to the paint supply pipe.
In a position coaxial with the coupler of
Coaxial with the paint supply pipe coupler in the state of being tilted at an angle
And the coupler of the paint supply pipe is
When the electrostatic coating machine to which pressure is applied is reciprocating,
At a predetermined electrical insulation distance from the coupler at the inlet
It is characterized by being arranged in a place.

[0008]

According to the present invention , coating is performed on a reciprocating electrostatic coating machine.
The pump that supplies the material is integrated into the electrostatic painting machine.
The pump and the electrostatic coating machine
No need to connect with weak flexible paint hose,
The piping distance from the pump to the electrostatic coating machine is shortened
Therefore, waste of the remaining paint is reduced.

A paint for supplying a conductive paint to a pump.
A supply pipe is provided in the reciprocator, and the paint for the pump is provided.
At the tip of the inlet and the pipe end of the paint supply pipe, respectively,
A coupler that is removably connected is formed. Soshi
The coupler at the paint inlet is the same as the coupler at the paint supply pipe.
If it is located at an axial position, move the electrostatic painting machine
By connecting the couplers, the paint supply pipe
The required amount of conductive paint is filled into the pump. Also quiet
With the electric coating machine tilted at a predetermined angle,
Is located coaxially with the coupler in the paint supply pipe
If necessary, tilt the electrostatic sprayer by a specified angle to move it.
By connecting the couplers, the paint supply pipe
The required amount of conductive paint is filled into the pump. This and
High voltage has not yet been applied to the electrostatic coating machine
High power to the paint supply system for conductive paint composed of paint supply pipes
No pressure leaks. Also originally attached to electrostatic coating machine
Electrostatic coating using the tilting mechanism and reciprocating mechanism
By tilting the machine at a predetermined position and moving it,
Are connected to each other.
There is no need to provide a separate retraction mechanism.

Next, after the filling of the paint is completed, the electrostatic paint is applied.
Move the mounting machine to separate the couplers from each other, and
Apply a predetermined high voltage to the
Then, the conductive paint is extruded from the pump and turned into an electrostatic coating machine.
To start electrostatic coating with the conductive paint. Paint
The coupler of the feed pipe is charged with static electricity when high voltage is applied.
A predetermined distance away from the reciprocating range of the coating machine
A pump that is arranged and integrated with the electrostatic coating machine
Keeps electrical insulation distance for coupler at paint inlet
High voltage applied to the electrostatic coating machine
Leakage to the conductive paint supply system consisting of
Nor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments shown in the drawings. FIG. 1 is a flow sheet showing one embodiment of an electrostatic coating apparatus for a conductive paint according to the present invention, FIG. 2 is a perspective view showing its appearance, and FIG . 3 is a flowchart showing another embodiment.
It is a door.

[0012]

1 and 2 show an example in which the electrostatic coating apparatus shown in FIGS. 1 and 2 is applied to a coating apparatus for coating a side surface of an object W to be coated such as an automobile. An electrostatic coating machine 1 is insulated from a reciprocator 2. mounted in an electrically insulated state through the arms 3, painting sometimes high voltage generator with a high voltage 80~120kV (not shown) is applied, an insulating arm 3 moves vertically
Ri article to be coated W are round trip moved up and down along the side of, at the time of unpainted be moved for example to the cleaning position of the upper end.

A pump 4 for supplying a water-based paint to the electrostatic coating machine 1 is built in a case 1a of the electrostatic coating machine 1 and attached to a tip of a shaft 6 which is reciprocated by a driving device 5 such as an air servomotor. The water-based paint introduced into the cylinder 9 from the paint inlet 8 by the piston 7 is pressed out from the paint outlet 10 of the cylinder 9 at a predetermined flow rate corresponding to the paint discharge amount of the electrostatic coating machine 1 to electrostatically discharge the paint. The fixed amount is supplied to the coating machine 1. Further, the electrostatic coating machine 1 is mounted so as to be tiltable up and down by an air motor 11 disposed at the tip of the insulating arm 3 so that the electrostatic coating machine 1 can be directed in a horizontal direction at the time of painting and vertically downward at the time of non-painting. At the end, a male coupler 12 that opens and closes the paint inlet 8
Are formed.

The reciprocator 2 includes a color changing valve device 1
A paint supply pipe 14 connected to the paint supply port 3 is provided, and a female coupler 15 is formed at the end of the paint supply pipe 14 so as to be removably fitted to the male coupler 12 of the paint inlet 8. The electrostatic coating machine 1 is positioned coaxially with the male coupler 12 with the electrostatic coating machine 1 oriented vertically downward, and is connected to the paint inlet 8 when the electrostatic coating machine 1 is moved to the upper end position of the reciprocator 2. Installed in a position

The male coupler 12 and the female coupler 1
5 has a check valve structure that is opened when fitted together. Further, the color changing valve device 13 includes a plurality of color changing valves CV _{1 to} CV ₃ for selectively supplying conductive paint of each color,
A cleaning air supply valve CVa for supplying the cleaning air and a cleaning liquid supply valve CVw for supplying the cleaning liquid are provided, and each of them is opened and closed at a predetermined timing.

The above is an example of the configuration of the present invention, and its operation will now be described. First, before the start of coating in which a high voltage is not applied to the electrostatic coating machine 1, the electrostatic coating machine 1 is moved to the upper end of the reciprocator 2 with the air motor 11 being directed vertically downward. The male coupler 12 of the paint inlet 8 of the pump 3 formed in the above is fitted to the female coupler 15 of the paint supply pipe 14 arranged in the reciprocator 2, and the paint supply pipe 14 and the paint inlet 8 are connected. Connect to each other. In this case, the pipe end of the paint supply pipe 14 is disposed so as to be coaxial with the male coupler 12 of the paint inlet 8 with the electrostatic coating machine 1 facing vertically downward. The electrostatic coating machine 1 can be reliably connected by moving the electrostatic coating machine 1, and there is no need to separately provide a large-sized driving device for moving the couplers 12 and 15 forward and backward.
The entire device can be reduced in size.

Next, _{one of} the color change valves CV _{1 to} CV ₃ provided in the color change valve device 13 is opened, and a conductive paint of a desired color selected by the valve is supplied to the paint supply pipe. 14 to the cylinder 9 of the pump 4 through the paint inlet 8 and at the same time, the driving device 5 of the pump 4
Then, the piston 7 in the cylinder 9 is retracted, and the conductive paint is introduced into the cylinder 9.

Then, the electrostatic coating machine 1 is placed in the cylinder 9.
When the required amount of conductive paint required for painting is filled, the electrostatic painting machine 1 is moved downward to move the male coupler 12 of the paint inlet 8 from the female coupler 15 of the paint supply pipe 14. Let go. In this state, a predetermined high voltage is applied to the electrostatic coating machine 1 to start the reciprocating movement of the insulating arm 3 up and down, and at the same time, the driving device 5 of the pump 4 is started, and the insulating shaft 6 is connected to the driving device 5 The conductive paint filled in the cylinder 9 is supplied from the paint discharge port 10 to the electrostatic coating machine 1 by the piston 7 connected via the piston 7 to start the electrostatic coating of the conductive paint.

At this time, the paint inlet 8 of the pump 4 for supplying the conductive paint to the electrostatic coating machine 1 and the pipe end of the paint supply pipe 14 for supplying the conductive paint to the pump 4 are separated from each other . Since the predetermined electrical insulation distance is maintained, the high voltage applied to the electrostatic coating machine 1 does not leak to the paint supply pipe 14 or the color changing valve device 13. Therefore, there is no troublesome to apply the insulating protection throughout the paint supply system of the paint tanks and paints piping for supplying the conductive paint to the color change valve CV ₁ ~CV ₃ of these paint supply tube 14 and the color change valve device 13. Further, a pump 4 for supplying a conductive paint to the electrostatic coating machine 1 is built in the case body 1a of the electrostatic coating machine 1 and is integrated .
, It is not necessary to connect the pump 4 and the electrostatic coating machine 1 with a flexible paint hose, and therefore, there is no need to replace this.

Next, when the conductive paint filled in the cylinder 9 of the pump 4 is used up and the paint with the paint is completed, the application of the high voltage to the electrostatic coating machine 1 is stopped, and the electrostatic motor is stopped by the air motor 11. The coating machine 1 is moved to the retreat position at the upper end of the reciprocator 2 with the coating machine 1 directed vertically downward, and the male coupler 12 of the paint inlet 8 of the pump 3 formed in the electrostatic coating machine 1 and the reciprocator 2 The female coupler 15 of the supplied paint supply pipe 14 is fitted again, and the cleaning air supply valve CVa and the cleaning liquid supply valve CVw provided in the color changing valve device 13 are alternately opened and closed, and the cleaning air supplied by these valves is supplied. Then, the conductive paint remaining in the cylinder 9 of the pump 4 is washed and removed from the paint supply pipe 14 with the washing liquid, and is blown vertically downward from the electrostatic coating machine 1 to be discharged. In addition,
The electrostatic coating machine 1 and the pump 4 are integrally mounted,
Since the piping from the pump 4 to the electrostatic coating machine 1 is short, the waste of the paint is reduced and the cleaning time can be shortened.

When the washing is completed, the next color conductive paint is selected by the color change valves CV _{1 to} CV ₃ of the color change valve device 13 and filled into the cylinder 9 of the pump 4. To start electrostatic painting again.

FIG. 3 is a flow sheet showing another embodiment , and the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description is omitted. This example shows a case where the present invention is applied to a top reciprocating apparatus for painting a roof or a bonnet of an automobile, and the electrostatic coating machine 1 is attached to an elevating reciprocator 16 arranged in a direction orthogonal to a conveying direction of the workpiece W. On the side surface of the case body 1a of the electrostatic coating machine 1, a male coupler 12 of the paint inlet 8 is formed. Further, the female coupler 15 of the paint supply tube 14 is provided on the right end portion of the temperature descending reciprocator 16. This female coupler 15
It is disposed coaxially opposite the male coupler 12 and has a high
When the electrostatic coating machine 1 to which the voltage is applied reciprocates.
From the male coupler 12 at the paint inlet 8, a predetermined electrical
It is arranged to keep the insulation distance .

Therefore, if the electrostatic coating machine 1 is moved to the right end position of the lifting / lowering reciprocator 16 before the start of coating,
The male and female couplers 12 and 15 are connected to fill the cylinder 9 of the pump 4 with paint, and when the paint is completed, the electrostatic coating machine 1 is moved to the left to make the couplers 12 and 15 available.
Is removed, and a high voltage is applied to the electrostatic coating machine 1 to perform coating with a predetermined stroke S, the high voltage applied to the electrostatic coating machine 1 leaks to a paint supply system such as the paint supply pipe 14. Nothing. In the description of the embodiment, the male and female couplers 12 and 15 are only required to tilt or move the electrostatic coating machine 1.
Has been described, but after the electrostatic coating machine 1 is tilted or moved to a position immediately before the connection, the coupler 12 or 15 may be moved back and forth by a small distance. In this case, the coupler is moved back and forth. The mechanism to be used is small, and can be accurately positioned and securely connected.

[0024]

As described above, according to the present invention,
Since the pump is integrated with the electrostatic painting machine to be moved backward, there is no need to connect the pump and the electrostatic painting machine with a flexible paint hose. it is possible to shorten the piping leading up, can reduce the residual paint in the pipe, has a very excellent <br/> the effect that it is possible to reduce also the cleaning time at or painting end color change. Also, move the electrostatic coating machine,
Is moved by tilting and moving the electrostatic coating machine.
The paint supply pipe installed in the ciprocator and the electrostatic coating machine
The paint inlet of the integrated pump is connected via a coupler.
So that they can be connected
There is no need to provide a separate large drive unit to advance and retreat by the distance.
Has the effect that the entire device can be miniaturized.
I do.

[Brief description of the drawings]

[1] Kazumi electrostatic coating apparatus of the conductive coating material according to the present invention
5 is a flow sheet showing an example .

FIG. 2 is a perspective view showing its appearance.

[3] The present invention in engagement Ru conductive coating other electrostatic coating apparatus
5 is a flow sheet showing an example .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electrostatic coating machine 2 ... Reciprocator 4 ... Pump 8 ... Paint introduction port 12 ... Male coupler 14 ... Paint supply pipe 15 ... Female coupler 16 ...・ Reciprocator

Claims (1)

(57) [Claims] 1. An electrostatic coating machine (1) to which a high voltage is applied.
While attached to the reciprocator (2) and reciprocating
A conductive paint is applied to an electrostatic painting machine (1) in a conductive paint electrostatic painting apparatus for painting.
A pump (4) is provided integrally with the electrostatic coating machine (1).
And supply a conductive paint to the pump (4).
A paint supply pipe (14) is provided in the reciprocator (2).
It is the a tip of the coating material inlet (8) of the pump (4) Paint
Each of the pipe ends of the supply pipe (14) is detachably connected to each other.
The couplers (12, 15) are formed, and the coupler (12) at the paint inlet (8) is
At a position coaxial with the coupler (15) of the feed pipe (14), or
With the electrostatic coating machine (1) tilted at a predetermined angle, the paint
Arranged coaxially with the coupler (15) of the supply pipe (14)
Is, the coupler of the paint supply pipe (14) (15), marks a high voltage
When the applied electrostatic coating machine (1) is moving back and forth,
Prescribed electrical insulation from coupler (12) at inlet (8)
Conductive paint characterized by being located at a distance
Electrostatic coating device.