JP2010274250A - System for supplying multi-color coating of conductive coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the application of a predetermined high voltage becomes impossible because an electric current leaks toward earth from a coating route in a case that a conductive coating is used in electrostatic coating and the effect of electrostatic coating is not obtained, the problem that a coating supply route becomes complicated for the purpose of an insulation measure in a color changing system and it is difficult to shorten a color changing time or to reduce the waste amount of the coating and a thinner caused by the change of a color, or the like. <P>SOLUTION: The leak of an electric current to the earth from the coating supply route is prevented by forming the cylinder and valve connected to the coating supply route into an insulating structure and providing coupling between a coating resupply route and the coating supply route and the function for discharging the residual charge produced by forming the cylinder and the valve into the insulating structure is provided. The shortening of the color changing time and the reduction of the waste amount of the coating and the thinner at the time of color change are achieved by providing a cylinder pump at every coating color and providing a color change valve in the vicinity of an electrostatic gun in order to improve the color changing efficiency of a plurality of coating colors. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a coating material supply apparatus for a coating apparatus.

When a conductive paint typified by an aqueous paint or a metallic paint is used for electrostatic coating, when the electrostatic gun applies a high voltage, a high voltage is also applied to the paint supply path via the conductive paint. When the paint supply device is grounded, the current leaks from the paint path to the ground side and a predetermined high voltage cannot be applied, and the effect of electrostatic coating cannot be obtained. Therefore, in the conventional paint supply apparatus, a method of performing electrostatic coating by insulating the entire paint supply system from the ground has been adopted.
The present invention realizes the insulation measures in the paint supply apparatus for conductive paint by providing an insulating structure for the cylinder and the valve and providing an insulation function using a coupling in the paint path.
In addition, the present invention has been devised to shorten the color change time and reduce the amount of paint and thinner discharged by color change by installing a dedicated cylinder for each paint color so that multiple paints can be supplied It is.

Japanese Patent No. 4002795 Japanese Patent No. 3554090 Japanese Patent No. 3285661 JP 2003-236421 A JP 2003-236420 A JP 2000-312841 A Japanese Patent Application Laid-Open No. 9-94491 JP-A-6-320071 JP 2008-168232 A Japanese Utility Model Publication No. 6-57444 Japanese Utility Model Publication No. 6-60451

When a conductive paint is used for electrostatic coating, when the electrostatic gun applies a high voltage, a high voltage is also applied to the paint supply path via the conductive paint. When the paint supply device is grounded, a current leaks from the paint path to the ground side, so that a predetermined high voltage cannot be applied, and the effect of electrostatic coating cannot be obtained.

Also, in the conventional system that can change the color of a plurality of paint colors, the paint supply path becomes complicated due to insulation measures, and it is difficult to shorten the color change time and to reduce the waste amount of paint and thinner by color change.

Prevents current from leaking from the paint supply path to the ground side by providing an insulating structure for the cylinder and valve connected to the paint supply path and providing a coupling between the paint supply path and the paint supply path. Make the structure.
Further, since the residual charge is charged after applying a high voltage by making the cylinder and the valve insulative structure, a function of discharging the charge charged at the high voltage OFF is provided.

In order to improve the color change efficiency of multiple paint colors, a cylinder pump is provided for each paint color, and a color change valve is provided near the electrostatic gun to shorten the color change time and reduce the amount of paint and thinner discarded when changing colors. Let

According to the present invention, the mechanical structure can be simplified as compared with the conventional paint supply apparatus, and the color change time can be shortened and the amount of paint and thinner discarded at the time of color change can be reduced.
In particular, the fact that the amount of paint and thinner can be reduced can also reduce VOCs, thereby reducing the impact on the global environment.

Configuration conceptual diagram showing an initial state in an embodiment of the present invention FIG. 2 is a conceptual diagram showing the composition of paint color 1 during filling of an embodiment of the present invention. FIG. 1 is a conceptual diagram showing the construction of a paint color 1 in an embodiment of the present invention. Configuration conceptual diagram showing paint color 1 remaining paint being discharged in an embodiment of the present invention FIG. 2 is a conceptual diagram showing a configuration during color change cleaning in an embodiment of the present invention. FIG. 3 is a conceptual diagram showing the composition of paint color 2 during coating / paint color 1 during filling of an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The attached drawing shows the system configuration of the paint supply device for conductive paint, and shows an example in which the number of paint colors is two.
The insulation structure of the cylinders 13 and 63 and the air cylinders 17 and 67, the paint supply coupling female side 18 and 68, and the valves 41 to 45 is a device in which metal parts are covered with a non-conductive resin plate and connected to the ground. The structure prevents contact.

FIG. 1 shows an initial state of the paint supply apparatus.

FIG. 2 shows an operation state during filling of the paint of paint color 1.
Next, an explanation will be given of the operation when the paint is filled.
The paint is pumped by the paint circulation pump 20 and circulates through the paint hoses 28 and 29.
The paint color 1 paint supply coupling air cylinder 14 is moved forward, the paint color 1 paint supply coupling male side 15 is pressed against the paint 1 paint supply coupling female side 16 to open the paint path, and the paint color 1 color valve 21 Is opened, paint pressure is applied to the paint color 1 cylinder 13 via the paint hoses 30 and 31. Then, by reversing the servo motor 10, the actuator 11 moves backward to fill the cylinder 13 with paint.
When the paint filling amount reaches the set value, the servo motor 10 is stopped, the paint color 1 color valve 21 is closed, the paint color 1 paint path dump valve 24 is opened, and the residual pressure is released to the waste liquid tank side through the paint hose 27. Then, the paint color 1 paint supply coupling male cylinder 15 is separated from the paint color 1 paint supply coupling female side 16 by retracting the paint color 1 paint supply coupling air cylinder 14 and the paint filling operation is completed.

FIG. 3 shows an operating state during painting of paint color 1.
Next, an explanation will be given of the operation when the filled paint is applied.
Paint Color 1 Paint Supply Coupling Air Cylinder 17 is advanced, Paint Color 1 Paint Supply Coupling Female side 18 is pressed against Paint Color 1 Paint Supply Coupling Male side 19 to open the paint path, Paint Color 1 Color Change Valve Open 43.
When the electrostatic gun 1 is turned on to apply a high voltage, the charged charge release switches 90 to 94 are opened to disconnect the device having an insulating structure from the ground.
When painting is ON, the gun trigger valve 45 is opened, the servo motor 10 is rotated forward, and the paint color 1 actuator 13 moves forward, so that the paint is discharged from the electrostatic gun 1 through the paint hose 32, 33, 40. Is done.
When painting is OFF, the servo motor 10 is stopped, the gun trigger valve 45 is closed, and the discharge of paint is stopped.
When the electrostatic gun 1 is in the high voltage application OFF state, the charged charge discharge switches 90 to 94 are closed, and the insulated device is connected to the ground, and the charged charge is discharged.

FIG. 4 shows an operating state during discharge of the remaining paint of paint color 1.
Next, an explanation will be given of the operation when the remaining paint of paint color 1 is discharged.
The paint color 1 paint supply coupling air cylinder 14 is moved forward, the paint color 1 paint supply coupling male side 15 is pressed against the paint 1 paint supply coupling female side 16 to open the paint path, and the paint color 1 color valve 21 Is opened, paint pressure is applied to the paint color 1 cylinder 13 via the paint hoses 30 and 31. Then, by rotating the servo motor 10 forward, the actuator 11 moves forward and the paint is returned from the cylinder 13 to the paint circulation.
When the cylinder reaches a predetermined position, the servo motor 10 is stopped, the paint color 1 color valve 21 is closed, the paint color 1 paint path dump valve 24 is opened, and the residual pressure is released to the waste liquid tank side through the paint hose 27, The paint color 1 paint supply coupling air cylinder 14 moves backward to separate the male color 15 paint supply coupling male side 15 from the paint color 1 paint supply coupling female side 16, and the paint discharge operation is completed.

FIG. 5 shows the operating state during color change cleaning.
Next, the operation in the case of color change cleaning will be described.
The gun trigger valve 45 is opened, the gun tip cleaning air valve 41 or the gun tip cleaning thinner valve 42 is opened, and cleaning air or cleaning thinner is discharged from the electrostatic gun 1 through the paint hose 40. Then, the gun tip path is cleaned by cleaning air or cleaning thinner.

FIG. 6 shows an operation state when the paint color 1 is filled while the paint color 2 is being applied.
The explanation of the operation during painting is the same as [0013], and the explanation of the operation during filling of the paint is the same as [0012].

1 Electrostatic Gun 10 Paint Color 1 Servo Motor 11 Paint Color 1 Actuator 12 Paint Color 1 Drive Shaft 13 Paint Color 1 Cylinder 14 Paint Color 1 Paint Supply Coupling Air Cylinder 15 Paint Color 1 Paint Supply Coupling Male Side 16 Paint Color 1 Paint Supply Coupling Female Side 17 Paint Color 1 Paint Supply Coupling Air Cylinder 18 Paint Color 1 Paint Supply Coupling Female Side 19 Paint Color 1 Paint Supply Coupling Male Side 20 Paint Color 1 Paint Circulation Pump 21 Paint Color 1 Color Valve 22 Paint color 1 Path cleaning air valve 23 Paint color 1 Path cleaning thinner valve 24 Paint color 1 Paint path dump valve 27-34 Paint color 1 Paint hose 40 Mixed color Paint hose 41 Gun tip cleaning air valve 42 Gun tip cleaning thinner valve 43 Paint Color 1 Color Change Valve 44 Paint Color 2 Color Change Bar 45 Gun Trigger Valve 60 Paint Color 2 Servo Motor 61 Paint Color 2 Actuator 62 Paint Color 2 Drive Shaft 63 Paint Color 2 Cylinder 64 Paint Color 2 Paint Supply Coupling Air Cylinder 65 Paint Color 2 Paint Supply Coupling Male Side 66 Coating Color 2 Paint Supply Coupling Female Side 67 Paint Color 2 Paint Supply Coupling Air Cylinder 68 Paint Color 2 Paint Supply Coupling Female Side 69 Paint Color 2 Paint Supply Coupling Male Side 70 Paint Color 2 Paint Circulation Pump 71 Paint Color 2 Color valve 72 Paint color 2 Path cleaning air valve 73 Paint color 2 Path cleaning thinner valve 74 Paint color 2 Paint path dump valves 77 to 84 Paint color 1 Paint hose 90 to 94 Charged charge discharge switch

Claims (4)

In a paint supply device for conductive paint using an electrostatic gun that generates high voltage, the cylinder and valve have an insulating structure, and a coupling is provided in the paint supply path and paint supply path to provide an insulation function for the paint supply path. A device for supplying a plurality of coating materials for conductive paint, which has a function of preventing current leakage from the paint path to the ground side. Cylinders and valves have an insulating structure. When high voltage is ON, the insulating structure is released from the ground, and when high voltage is OFF, the insulating structure is grounded, and the charged charge on the insulating structure is discharged. The apparatus for supplying a plurality of paints of a conductive paint according to claim 1. In order to improve the color change efficiency of the paint, a color change valve is installed near the electrostatic gun, and the distance between the color change valve and the electrostatic gun is shortened, so the color change time and color change The apparatus for supplying a plurality of conductive paints for a conductive paint according to claim 1, further comprising a function of reducing the amount of paint and thinner discarded at the time. A servo motor, actuator, and cylinder pump are installed for each paint color so that multiple paints can be supplied. The multi-color paint supply apparatus for conductive paint according to claim 1, wherein:

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