JP2871878B2 - Electrostatic coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic coating device for applying a high voltage directly to a conductive paint to perform electrostatic coating.

[0002]

2. Description of the Related Art Conventionally, an electrostatic coating apparatus for applying a high voltage to a conductive paint to apply an electrostatic coating to an object to be coated such as an automobile body includes a color changing valve mechanism as a paint supply source and an intermediate storage. An insulating mechanism is provided to electrically insulate the tank from the tank. For example, a technique disclosed in US Pat. No. 4,771,729 is known.

As shown in FIG. 3, in this prior art, an insulating mechanism 6 is disposed between the color changing valve mechanism 2 and the intermediate storage tank 4, and the insulating mechanism 6 is electrically connected to the paint gun 8 by a conductive material. When the paint is supplied to the object to be coated, the color changing valve mechanism 2 and the intermediate storage tank 4 are electrically insulated. The insulating mechanism 6 includes an insulating tube 10 and the insulating tube 1.
0 two-way switching valves 12 for paint inlet and paint outlet respectively.
a and 12b are arranged. The two-way switching valves 14a and 14b for introducing and discharging the cleaning liquid and the two-way switching valves 1 for introducing and discharging the air are provided at the upper end and the lower end of the insulating tube 10.
6a and 16b are connected.

[0004]

However, in the above-mentioned prior art, the insulating mechanism 6 has six two-way switching valves 12a, 1b.
2b, 14a, 14b, 16a, and 16b, and the two-way switching valve 14
A tube for placing a, 14b, 16a and 16b is connected. Therefore, the two-way switching valves 12a, 12
b, two-way switching valves 12b and 14b, 1
6b, it is necessary to ensure insulation, and in addition to the large number of switching valves (two-way switching valves) used, the insulating mechanism 6
In addition, there is a problem that the structure of the entire electrostatic coating apparatus incorporating the insulating mechanism 6 becomes considerably large and complicated. Further, between the two-way switching valves 12a and 14a and the two-way switching valve 12
Between the points b and 16b, cleaning is difficult, and liquid pools are liable to occur, so that it takes a long time to dry and the insulating state becomes unstable.

The present invention solves this kind of problem and provides an electrostatic coating apparatus which can reduce the number of switching valves to be used, simplify the configuration easily and have excellent cleaning properties. The purpose is to provide.

[0006]

To achieve the above object, the present invention provides a color changing valve mechanism for selectively supplying a conductive paint, a cleaning liquid and air, and a selective supply of a cleaning liquid and air. A cleaning valve mechanism, a first directional control valve having an inlet side connected to each supply path extending from the color changing valve mechanism and the cleaning valve mechanism, and an outlet side of the first directional control valve,
A block path made of an insulating material having one end connected thereto, a second directional control valve having an inlet connected to the other end of the block path, and a supply path connected to an outlet side of the second directional control valve. The intermediate storage tank, and the other outlet side of the second directional control valve, a waste liquid tank connected via a discharge path, and the intermediate storage tank, connected via a delivery path ,
A painting gun for high voltage application means is connected, characterized in that it comprises a.

[0007]

In the above-described electrostatic coating apparatus according to the present invention, a desired conductive paint is temporarily filled in the intermediate storage tank from the color changing valve mechanism through the first directional control valve, the block path and the second directional control valve. After that, the block path is cleaned through the cleaning valve mechanism, and the color changing valve mechanism and the intermediate storage tank are electrically insulated from each other. The paint is supplied to the work and the work is performed. At this time, the color change valve mechanism and the washing valve mechanism are selectively connected to the block path under the switching action of the first directional control valve, and the block path is switched under the switching action of the second directional control valve. It is selectively connected to the intermediate storage tank and the waste liquid tank.
For this reason, the number of switching valves can be reduced as compared with the case where a two-way switching valve is used, the cleaning properties are excellent, and the entire configuration of the electrostatic coating apparatus can be easily simplified.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electrostatic coating apparatus according to the present invention.

In FIG. 1 and FIG.
Shows an electrostatic coating apparatus according to the present embodiment. The electrostatic coating device 20 includes a color changing valve mechanism 22, air (A), water (W)
Valve mechanism 2 for selectively supplying cleaning fluid (S) and the like
4, a first three-way switching valve (directional control valve) 30 having an inlet connected to respective supply paths 26 and 28 extending from the color changing valve mechanism 22 and the washing valve mechanism 24, and the first three-way switching valve. At the outlet side of 30, a block path 32 made of an insulating material having one end connected thereto, and at the other end of the block path 32,
Second three-way switching valve (directional control valve) 34 connected to the inlet side
And a supply path 36 on the outlet side of the second three-way switching valve 34.
, A waste liquid tank 42 connected to the other outlet side of the second three-way switching valve 34 via a discharge path 40, and a delivery path 44 to the intermediate storage tank 38.
Are connected via a Rutotomoni, high voltage hands not shown
And a painting gun 46 connected to the stage.

The color changing valve mechanism 22 includes a cleaning valve 4 for controlling the supply of air (A), water (W), cleaning liquid (S), and the like.
8 and a plurality of paint valves 50a to 50e capable of supplying different paints. This color changing valve mechanism 22
A block valve mechanism 52 is constituted by the first three-way switching valve 30, the block path 32, and the second three-way switching valve 34 disposed between the first storage valve 38 and the intermediate storage tank 38.

The intermediate storage tank 38 is provided with a first cylinder chamber 56 for injecting paint and cleaning liquid and the like, which is divided via a piston 54, and a second cylinder chamber 58 for supplying air. , The air supply source 60 is the flow control valve 6
2. It communicates via the on-off valve 64. This air supply source 60
Is connected via a booster 66 to a paint flow rate regulator 68 for adjusting the air pressure, and the flow rate regulator 68 controls the discharge amount of the paint. This flow controller 6
8 is provided on the transmission path 44.

The coating gun 46 includes a dump valve 70 and a trigger valve 72, and is connected to a known high voltage applying means (not shown).

Next, the operation of the electrostatic coating apparatus 20 configured as described above will be described.

First, when a predetermined color paint derived from the paint valve 50a of the color changing valve mechanism 22 is supplied to the block valve mechanism 52 through the supply path 26, as shown in FIG. The first cylinder chamber 56 of the intermediate storage tank 38 is filled through the first three-way switching valve 30, the block path 32, the second three-way switching valve 34, and the supply path 36. The paint filled in the first cylinder chamber 56 is filled through the delivery path 44 to the coating gun 46, and at the time of this filling, the trigger valve 72 is closed, while the dump valve 70 is opened, and after the filling, This dump valve 70 is closed.

Therefore, the switching operation of the first and second three-way switching valves 30 and 34 constituting the block valve mechanism 52 is performed, and the supply path 28 extending from the cleaning valve mechanism 24 communicates with one end of the block path 32. The other end of the block path 32 communicates with the waste liquid tank 42 via the discharge path 40 (see FIG. 2). In this state, the cleaning liquid is supplied to the first three-way switching valve 30 under the driving action of the cleaning valve mechanism 24, and this cleaning liquid cleans the block path 32 and discharges the discharge path 40.
From the waste liquid tank 42. Then, the block valve mechanism 52 is dried, so that the color changing valve mechanism 22 and the intermediate storage tank 38 are electrically insulated.

Next, a flow control valve 62 is supplied from an air supply source 60.
Driving air is supplied to the second cylinder chamber 58 of the intermediate storage tank 38 via the opening / closing valve 64 and the piston 54
The paint is displaced toward the cylinder chamber 56 and is supplied to a work (not shown) under the action of opening the trigger valve 72 in a state where a high voltage is applied.

In this case, in this embodiment, the color changing valve mechanism 22
Block valve mechanism 5 disposed between the storage tank 38 and the intermediate storage tank 38
2 includes a block path 32 and first and second three-way switching valves 30 and 34 disposed at both ends of the block path 32. For this reason, the number of switching valves can be reduced at once, as compared with a conventional insulating mechanism in which a large number of two-way switching valves (for example, six switching valves) are arranged.

Moreover, unlike the conventional two-way switching valve, there is no need to branch off the path of the block path 32, so that it is not necessary to consider insulation or the like in the branched pipe. Therefore, it is possible to reliably ensure the insulation state, and it is possible to obtain an effect that the configuration of the block valve mechanism 52 is easily simplified.

Further, the color changing valve mechanism 22 and the washing valve mechanism 24
Are directly connected to the first three-way switching valve 30 via the respective supply paths 26 and 28, and the second storage valve 38 is connected to the second three-way switching valve 34 via the supply path 36 and the discharge path 40. , The waste liquid tank 42 is directly connected. For this reason, there is an advantage that the entire configuration of the electrostatic coating device 20 is simplified at a stroke.

[0020]

According to the electrostatic coating apparatus of the present invention, the following effects can be obtained.

The color change valve mechanism and the washing valve mechanism are selectively connected to a block path under the switching action of the first directional control valve, and this block path is connected to the intermediate section under the switching action of the second directional control valve. Since it is selectively connected to the storage tank and the waste liquid tank, the number of switching valves can be reduced as compared with the case of using a two-way switching valve, the cleaning performance is excellent, and the overall configuration of the electrostatic coating device is easy. Can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an electrostatic coating apparatus according to the present invention.

FIG. 2 is an operation explanatory view of the electrostatic coating device.

FIG. 3 is a schematic explanatory view of an electrostatic coating apparatus incorporating a conventional insulating mechanism.

[Explanation of symbols]

 Reference Signs List 20 coating device 22 color changing valve mechanism 24 washing valve mechanism 26, 28 supply path 30 three-way switching valve 32 block path 34 three-way switching valve 36 supply path 38 intermediate storage tank 40 discharge path 44 Delivery path 46 ... Coating gun 52 ... Block valve mechanism

Claims (1)

(57) [Claims] 1. A color changing valve mechanism for selectively supplying a conductive paint, a cleaning liquid and air, a cleaning valve mechanism for selectively supplying a cleaning liquid and air, and extending from the color changing valve mechanism and the cleaning valve mechanism. A first directional control valve having an inlet connected to each of the supply paths, an outlet side of the first directional control valve, a block path made of an insulating material having one end connected thereto, and another end of the block path, A second directional control valve to which an inlet side is connected; an intermediate storage tank connected via a supply path to an outlet side of the second directional control valve; and a discharge to another outlet side of the second directional control valve. a waste liquid tank connected via a path, said the intermediate reservoir and is connected via a transmission path together
, The electrostatic coating apparatus, comprising a spray gun which is a high voltage application means is connected, the.