JPWO2006067983A1 - Electrostatic coating equipment - Google Patents

Abstract

The high voltage circuit breaker (11) includes a conductive paint filling side cover (12) at an earth potential, an insulating paint discharge side cover (13), an insulating cartridge housing cylinder (14), In the cartridge moving hole (14A, 14B) of the cartridge housing cylinder (14), there is a gap between the filling side where the paint is filled and the discharge side where the paint is discharged to the coating machine (2). A movable cartridge (15, 16) is provided. Therefore, even if a high voltage is applied to the coating machine (2) by the high voltage generator (4), the paint filling side cartridge is electrically disconnected from the coating machine (2) and the coating material discharge side cartridge. Can do. Moreover, by alternately moving the cartridges (15, 16), the two cartridges (15, 16) can be applied alternately.

Description

  The present invention relates to an electrostatic coating apparatus that performs coating by directly applying a high voltage to, for example, water-based paints, solvent-based metallic paints containing metal pigments, and the like.

Generally, an electrostatic coating apparatus that coats an object to be coated is roughly composed of a coating machine that sprays a charged paint to which a high voltage is applied by direct charging, and a paint supply apparatus that supplies the paint to the coating machine. Yes. In a directly charged electrostatic coating apparatus that directly applies a high voltage to the paint, it is necessary to prevent the high voltage applied to the paint from leaking to the ground potential. For this reason, in this kind of electrostatic coating apparatus, it is set as the structure which interrupts | blocks the intermediate part of a coating machine and a coating material supply apparatus with respect to earth potential.
Here, in the electrostatic coating apparatus according to the prior art, a part of the paint supply device is formed as two liquid reservoirs having a tube shape, and these two liquid reservoirs are respectively connected to the paint source side and the coating machine side via hoses. Connected. When painting, the liquid reservoir is filled with the paint via the hose on the paint source side, and then the paint in the hose is discharged and washed. Thereby, a space is formed in the hose on the paint source side, and the coating machine is cut off from the ground potential by the space formed in the hose. In this state, by supplying air pressure to the liquid reservoir, the liquid reservoir can supply the filled paint to the coating machine via the hose on the coating machine side. And a coating machine sprays this coating material toward a to-be-coated object, applying a high voltage to the coating material supplied from a liquid reservoir (for example, refer to Unexamined-Japanese-Patent No. 2-2885).
In another electrostatic coating apparatus according to the prior art, a plurality of paint tanks attached to a rotating pedestal are connected to a coating position or a color changing device connected to the electrostatic coating machine by rotating the rotating pedestal. It is set as the structure switched to a filling position. Here, the paint tank arranged at the painting position is cut off from the ground potential by being separated from the color changing device, and is covered with an insulating cover. This prevents a high voltage applied to the paint from leaking to the ground potential during the painting operation (see, for example, Japanese Patent Application Laid-Open No. 9-234397).
In the electrostatic coating apparatus, when the paint tank is filled with the paint from the color changing device at the filling position, the paint tank is moved to the painting position by the rotating base and connected to the electrostatic coating machine. In this state, a working fluid such as air or hydraulic oil is supplied to the paint tank, and the filled paint is pushed out to the electrostatic coating machine side. Thus, the coating machine sprays the charged paint toward the object to be coated while applying a high voltage to the paint. On the other hand, at the time of this painting work, another paint tank used for the next painting work is arranged at the filling position, and the paint filling work is performed.
Further, in another electrostatic coating apparatus according to the prior art, one cylinder container constituting the paint supply apparatus is provided, and the paint chamber defined in the cylinder container is connected to a paint source through a supply line. It is configured to be connected to a coating machine via a discharge pipe line. When coating is performed, the paint in the cylinder container is filled with the paint through the supply pipe, and then the paint in the supply pipe is discharged and washed. As a result, the coating machine is in a state where it is cut off from the ground potential by the space in the supply pipeline, and in this state, the insulating oil is supplied to the insulating oil chamber of the cylinder container. Thus, the coating machine sprays the paint toward the object to be coated while applying a high voltage to the paint supplied from the paint chamber of the cylinder container (see, for example, JP-A-3-262558).
By the way, the electrostatic coating apparatus according to the above-mentioned Japanese Patent Application Laid-Open No. 2-2885 is configured to extrude a paint filled in a liquid reservoir using an extrusion fluid. In this case, air (gas) having compressibility is used as a fluid for extruding the coating material in the liquid reservoir. As a result, the pressure of the air changes when the paint in the liquid reservoir is pushed out, so that the paint cannot be stably supplied to the coating machine by a certain amount, and the coating quality deteriorates. There is.
Moreover, in the electrostatic coating apparatus according to Japanese Patent Application Laid-Open No. 9-23497, since a coating machine is integrally provided for a plurality of paint tanks and the like, the coating apparatus including the coating machine is increased in size and weight. turn into. For this reason, when a painting device is attached to the tip of an arm of a painting robot, for example, a large load acts on the arm, etc., so a large painting robot with a large output is required to operate the arm quickly. become. In addition, there is a problem that a large coating apparatus cannot be used when painting in a narrow and complicated place such as in an automobile.
In addition, the electrostatic coating apparatus according to Japanese Patent Laid-Open No. 3-262558 is filled with paint through a supply pipe in one cylinder container when painting, and is applied after the paint in the supply pipe is discharged and washed. It is set as the structure which performs. For this reason, since coating cannot be performed while the paint is being filled and the supply pipe is being cleaned, there is a problem in that the coating cannot be performed continuously and the productivity is low.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to improve the coating quality by stably supplying the paint while preventing the high voltage applied to the paint from leaking to the ground potential. Another object of the present invention is to provide an electrostatic coating apparatus that can improve the reliability and productivity by increasing the number of cartridges that can be alternately applied.
Another object of the present invention is to provide an electrostatic coating apparatus that can reduce the size and weight of a coating machine, thereby reducing the size of, for example, a painting robot for attaching a coating machine, and can also paint a narrow place. There is to do.
(1). The electrostatic coating apparatus according to the present invention can be moved to a coating machine for spraying a charged paint to which a high voltage is applied by direct charging, a filling side for filling the paint, and a discharge side for discharging the paint to the coating machine. Two cartridges, and among these cartridges, a high voltage shut-off means for shutting off the paint discharge side cartridge and the coating machine from the ground potential, and the paint filling side cartridge in the high voltage shut-off means Filling the paint discharge side cartridge by supplying the extrusion liquid to the paint discharge side cartridge in the high voltage blocking means and the color changing means for filling the next color paint after washing the remaining previous color paint with the cleaning fluid Paint extruding means for extruding the supplied next color paint and supplying it to the coating machine; and the two cartridges constituting the high voltage shut-off means at the paint filling side position It lies in the arrangement by the cartridge moving means for moving alternately and charge discharge side position.
Thus, according to the present invention, in the color changing process of cleaning the previous color paint and filling the next color paint, the cartridge moving means moves one cartridge that has finished the painting process to the paint filling side position. When one of the cartridges is disposed at the paint filling side position, the color changing unit fills the next color paint after washing the previous color paint remaining in the paint filling side cartridge with the washing fluid.
When one of the cartridges is moved to the paint filling side position and the next color paint is filled, the cartridge moving means finishes the color changing process and moves the other cartridge filled with the next color paint to the paint discharge side. Move to position. When the other cartridge is disposed at the paint discharge side position, the paint extruding means supplies the extrusion liquid to the paint discharge side cartridge. Thereby, the next color paint filled in the paint discharge side cartridge is extruded by a certain amount and discharged toward the coating machine. Therefore, the coating machine directly applies a high voltage to the next color paint supplied from the paint discharge side cartridge and sprays the charged paint toward the object to be coated.
At this time, since the paint discharge side cartridge is separated from the color changing means, the cartridge and the coating machine are electrically disconnected from the ground potential. For this reason, even if a high voltage is applied to the paint with a coating machine, the high voltage applied to the paint can be prevented from leaking to the ground potential.
Further, the color changing process by the color changing means and the coating process by the paint pushing means can be carried out alternately in parallel. Thus, the cartridge moving means can alternately perform the coating by moving the two cartridges alternately to the paint discharge side position, thereby improving the productivity.
Further, the high voltage blocking means and the coating machine may be connected by a paint hose or the like and can be disposed apart from the coating machine, so that the coating machine can be reduced in size and weight. Thereby, for example, even when a painting robot with a small output is used, the painting machine can be operated quickly. In addition, it is possible to efficiently paint in a narrow place such as the inside of an automobile.
Furthermore, since the paint extruding means uses an incompressible extruding liquid to extrude the paint from the inside of the paint discharge side cartridge, the extruding liquid can supply the paint to the coating machine by a certain amount. Thereby, the spray pattern of a coating material can be stabilized, coating quality can be improved and reliability can be improved.
(2). In the present invention, the high-voltage blocking means includes a paint filling side lid formed of a conductive material, a paint discharge side lid formed of an insulating material or a conductive material, and the paint filling side lid. Cartridge housing cylinder made of an insulating material provided with two cartridge moving holes provided between the body and the paint discharge side lid body and extending in parallel between the lid bodies, and each cartridge of the cartridge housing cylinder body The two cartridges movably provided in the moving holes, each of the cartridges is provided with a paint containing chamber filled with the next color paint from the color changing means by a movable partition and the paint pusher It is good also as a structure defined to the extrusion liquid storage chamber to which extrusion liquid is supplied from a means.
Thereby, according to this invention, the high voltage interruption | blocking means forms the coating material filling side cover body with an electroconductive material, and forms the cartridge accommodation cylinder body with an insulating material. Therefore, when the cartridge is moved to the paint discharge side position, a high voltage can be cut off between the paint discharge side cartridge and the paint filling side cover.
Further, when the cartridge charged with a high voltage moves to the paint filling side position, the high voltage of the cartridge can be released to the ground potential via the paint filling side cover made of a conductive material. Furthermore, since the high voltage cutoff means is composed of the paint filling side cover, the paint discharge side cover, the cartridge housing cylinder, and the two cartridges, it can be reduced in size and weight, and the installation location can be freely set. The degree can be increased.
(3). In the present invention, the high voltage cut-off means may be provided with a cartridge selection valve for selecting a cartridge located on the paint discharge side from the two cartridges and connecting to the coating machine.
Thereby, according to this invention, the cartridge selection valve can select the cartridge located in the coating material discharge side among two cartridges, and can connect with a coating machine. Therefore, the cartridge selection valve can alternately supply the paint from two cartridges to one coating machine, and the configuration can be simplified.
(4). In the present invention, the high voltage shut-off means is provided with a coating machine cleaning means for cleaning the pre-colored paint adhering to the coating machine by supplying a cleaning fluid toward the coating machine after completion of painting. Also good.
Thus, according to the present invention, when the coating process is completed, the coating machine cleaning means supplies the cleaning fluid to the coating machine, so that the previous color paint adhering to the coating machine is cleaned and the next coating is performed. It can prepare for a process.
(5). In the present invention, the color changing means is constituted by a color changing valve device for supplying a plurality of colors of paint and cleaning fluid, and the two cartridges are provided between the color changing valve device and the high voltage cutoff means. Among them, a color change direction selection valve for circulating the paint and the cleaning fluid toward the cartridge located on the paint filling side may be provided.
Thus, according to the present invention, when the color change valve device supplies the paint or the cleaning fluid, the color change direction selection valve applies the paint or the cleaning fluid toward the cartridge located on the paint filling side of the two cartridges. Circulate. Thus, the paint and the cleaning fluid can be supplied to the two cartridges using one color change valve device. As a result, the configuration of the color changing means can be simplified, and the installation space can be reduced and the cost can be reduced.
(6). In the present invention, the paint extruding means is constituted by an extruding liquid supply device for supplying an extruding liquid, and the paint discharge side of the two cartridges is interposed between the extruding liquid supply device and the high voltage cutoff means. It is good also as a structure which provides the extrusion liquid direction selection valve which distribute | circulates extrusion liquid toward the cartridge located in this.
Thereby, according to this invention, when an extrusion liquid supply apparatus supplies extrusion liquid, an extrusion liquid direction selection valve distribute | circulates extrusion liquid toward the cartridge located in the coating material discharge side among two cartridges. Thus, the extrusion liquid can be supplied to the two cartridges by using one extrusion liquid supply device. As a result, the configuration of the paint extruding means can be simplified, and the installation space can be reduced and the cost can be reduced.
(7). In the present invention, the coating material extruding means is constituted by two extruding liquid supply devices for supplying extruding liquid, and the two extruding liquid supply devices are arranged in the two cartridges constituting the high voltage shut-off means. It is good also as a structure which supplies an extrusion liquid separately.
Thus, according to the present invention, since the dedicated extrusion liquid supply device can be provided for each of the two cartridges, the extrusion liquid is supplied to the cartridge located on the paint discharge side using one of the extrusion liquid supply devices. During the supply, the other extrusion liquid supply device can be used to supply the extrusion liquid to the cartridge located on the paint filling side. Thereby, even when the previous color paint remains in the cartridge moved to the paint filling side, the remaining paint can be discharged during the painting operation, and the cartridge can be efficiently cleaned.
(8). In the present invention, the high voltage shut-off means defines air chambers on both sides in the moving direction of the two cartridges, and the cartridge moving means includes a drive air supply device that supplies drive air, and the drive You may comprise by the drive air switching valve which flows the drive air supplied from an air supply apparatus into the said air chamber corresponding to the moving direction of the said cartridge.
Thus, according to the present invention, the drive air switching valve can supply drive air from the drive air supply device to the air chamber corresponding to the moving direction of the cartridge. Thus, the cartridge moving means can move the two cartridges alternately between the paint filling side position and the paint discharge side position by simply switching the drive air switching valve.

FIG. 1 is an overall configuration diagram showing an electrostatic coating apparatus according to a first embodiment of the present invention in a state where a first cartridge is disposed on a paint filling side and a second cartridge is disposed on a paint discharge side.
FIG. 2 is an overall configuration diagram showing the electrostatic coating apparatus of FIG. 1 in a state where the first cartridge is arranged on the paint discharge side and the second cartridge is arranged on the paint filling side.
FIG. 3 is an enlarged cross-sectional view of a main part showing the connection switching valve, the return side connection valve, the disposal side connection valve and the like in FIG. 1 in an enlarged manner.
FIG. 4 is an enlarged cross-sectional view of the main part showing a state in which the check valve of the cartridge is connected to the connection switching valve, the return side connection valve, and the disposal side connection valve.
FIG. 5 is an enlarged cross-sectional view of a main part showing the supply side connection valve and the like in FIG. 1 in an enlarged manner.
FIG. 6 is an enlarged cross-sectional view of a main part showing an enlarged view of the cartridge selection valve, the cleaning fluid valve for the coating machine, etc. in FIG.
FIG. 7 is an enlarged cross-sectional view of a main part showing a state in which the check valve of the cartridge is connected to the paint supply valve of the cartridge selection valve in FIG.
FIG. 8 is an enlarged cross-sectional view of a main portion showing each check valve provided on the paint filling side end plate of the cartridge in an enlarged manner.
FIG. 9 is an enlarged cross-sectional view of a main part showing each check valve provided on the paint discharge side end plate of the cartridge in an enlarged manner.
FIG. 10 is an enlarged cross-sectional view of a main part showing the color change direction selection valve and the extrusion liquid direction selection valve in FIG. 1 in an enlarged manner.
FIG. 11 is a block diagram showing the cartridge moving device according to the first embodiment of the present invention.
FIG. 12 is a time chart showing the relationship between the moving position of the cartridge, the color changing process, and the painting process according to the first embodiment of the present invention.
FIG. 13 is a time chart showing the color changing process.
FIG. 14 is a time chart showing the painting process.
FIG. 15 is an overall configuration diagram showing an electrostatic coating apparatus provided with an extrusion liquid supply apparatus and the like according to the second embodiment of the present invention.
FIG. 16 is a block diagram showing a cartridge moving device according to a modification of the present invention.

Hereinafter, an electrostatic coating apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 14 show a first embodiment of the present invention. 1 and 2, reference numeral 1 denotes a direct charging type electrostatic coating apparatus according to the first embodiment. The electrostatic coating apparatus 1 is directly applied to, for example, water-based paints, solvent-based metallic paints containing metal pigments, and the like. A high voltage is applied to the coating. The electrostatic coating apparatus 1 is disposed in the vicinity of, for example, a painting robot, a reciprocator, and the like (not shown), and will be described later with a coating machine 2, a high-voltage circuit breaker 11, a color change valve device 60, and an extrusion liquid supply. The apparatus 64, the cartridge selection valve 30, the cartridge moving device 74, and the like are roughly configured.
Reference numeral 2 denotes a coating machine constituting the electrostatic coating apparatus 1. The coating machine 2 is configured as, for example, a rotary atomizing head type coating machine including a rotary atomizing head 2A, and is attached to, for example, an arm tip of a painting robot, a reciprocator, or the like. In addition, the coating machine 2 is provided with a paint discharge passage 2B for supplying a paint or the like to the rotary atomizing head 2A, and the paint discharge passage 2B is provided with a paint valve 2C for controlling the discharge timing of the paint or the like. It has been. Further, the paint discharge flow path 2B is connected to a merging path 33 of a cartridge selection valve 30 described later via a paint flow path 3 such as a paint hose. Further, a high voltage generator 4 is connected to the coating machine 2, whereby the coating machine 2 can apply a high voltage to the paint flowing through the paint discharge flow path 2B by direct charging.
Next, a description will be given of a high voltage blocking means for blocking the coating machine 2 and the cartridge connected to the coating machine 2 for supplying the coating with respect to the ground potential.
Reference numeral 11 denotes a high voltage circuit breaker provided as a high voltage circuit breaker connected to the coating machine 2. The high-voltage circuit breaker 11 is roughly constituted by a paint filling side cover 12, a paint discharge side cover 13, a cartridge housing cylinder 14, two cartridges 15 and 16, which will be described later. The high voltage circuit breaker 11 includes a cartridge disposed on the discharge side (paint discharge side lid 13 side) of the two cartridges 15 and 16 on which the paint is discharged to the coating machine 2 and the coating machine 2. It intercepts against earth potential.
A paint filling side cover 12 is provided on the filling side where the paint is filled. The paint filling side cover 12 is formed using a conductive material such as a metal material or a conductive resin material. The paint filling side lid 12 closes the paint filling side end face of each cartridge moving hole 14A, 14B provided in the cartridge housing cylinder 14 described later. Further, the paint filling side cover 12 is connected to the ground potential, and thus, when it comes into contact with the cartridges 15 and 16, the high voltage charged in the cartridges 15 and 16 can be released to the ground potential.
On the other hand, 13 is a paint discharge side cover provided on the discharge side from which the paint is discharged to the coating machine 2 with a space from the paint filling side cover 12, and the paint discharge side cover 13 has cartridge movement holes which will be described later. The end surfaces on the paint discharge side of 14A and 14B are closed. Moreover, the coating material discharge side cover 13 is formed using insulating materials, such as glass material and an insulating resin material, for example.
As a result, when the high voltage circuit breaker 11 is attached to the painting robot or the like, the paint discharge side lid 13 leaks the high voltage applied to the paint to the painting robot through the paint discharge side lid 13. Can be prevented. In addition, when an insulation process is performed between the paint discharge side lid 13 and the painting robot, the paint discharge side lid 13 is formed using a conductive material such as a metal material or a conductive resin material. You can also.
These lid bodies 12 and 13 are formed, for example, in a thick oval shape. The lid bodies 12 and 13 are attached to the end surface of the cartridge housing cylinder 14 using, for example, a plurality of bolts (not shown) so as to airtightly close the cartridge moving holes 14A and 14B.
Reference numeral 14 denotes a cartridge housing cylinder provided between the paint filling side lid 12 and the paint discharge side lid 13. The cartridge housing cylinder 14 is formed as a cylinder having an oval cross section, for example. Further, the cartridge housing cylinder 14 has a first cartridge moving hole 14A and a second cartridge moving hole 14B extending between the paint filling side cover 12 and the paint discharge side cover 13 so as to be arranged substantially in parallel. Is provided. In these cartridge movement holes 14A and 14B, cartridges 15 and 16, which will be described later, are inserted so as to be movable in the axial direction.
Here, the cartridge housing cylinder 14 is formed using an insulating material such as a glass material or an insulating resin material, similarly to the coating material discharge side lid 13. Thus, the cartridge housing cylinder 14 electrically separates the cartridge disposed on the paint discharge side on the coating machine 2 side from the respective cartridges 15 and 16 from the paint filling side lid body 12, and the coating machine 2 The high voltage applied to is prevented from leaking to the ground potential.
Reference numeral 15 denotes a first cartridge which is inserted into the first cartridge moving hole 14A of the cartridge housing cylinder 14 so as to be movable in the axial direction. The first cartridge 15 includes a disc-shaped paint filling side end plate 15A located on the paint filling side lid 12 side and a disk-like paint ejection side end plate 15B located on the paint ejection side lid 13 side. And a cylindrical cylinder portion 15C provided between the end plates 15A and 15B, and a piston 15D fitted into the cylinder portion 15C so as to be movable in the axial direction. The piston 15D defines the inside of the cylinder portion 15C into a paint storage chamber 15E on the paint discharge side end plate 15B side and an extruded liquid storage chamber 15F on the paint filling side end plate 15A side. Further, a seal ring 15G that hermetically seals between the end plates 15A and 15B and the first cartridge moving hole 14A is mounted on each of the end plates 15A and 15B.
Reference numeral 16 denotes a second cartridge that is inserted into the second cartridge moving hole 14B of the cartridge housing cylinder 14 so as to be movable in the axial direction. The second cartridge 16 includes a paint filling side end plate 16A, a paint discharge side end plate 16B, a cylinder part 16C, and a piston 16D as a movable partition wall, in substantially the same manner as the first cartridge 15 described above. The inside of the cylinder part 16C is defined by a piston 16D into a paint storage chamber 16E and an extruded liquid storage chamber 16F. Further, seal rings 16G are mounted on the outer peripheral sides of the end plates 16A and 16B, respectively.
Reference numeral 17 denotes a first paint filling side air chamber which is located in the first cartridge moving hole 14A of the cartridge housing cylinder 14 and is defined between the paint filling side cover 12 and the first cartridge 15. ing. Reference numeral 18 denotes a first paint discharge-side air chamber that is located in the first cartridge moving hole 14B and defined between the paint discharge-side cover 13 and the first cartridge 15.
The air chambers 17 and 18 are supplied with driving air from a cartridge moving device 74 described later. Then, the first paint filling side air chamber 17 moves the first cartridge 15 to the paint discharge side lid 13 side as shown in FIG. On the other hand, the first paint discharge-side air chamber 18 moves the first cartridge 15 toward the paint filling-side lid 12 as shown in FIG.
Reference numeral 19 denotes a second paint filling side air chamber located in the second cartridge moving hole 14B of the cartridge housing cylinder 14 and defined between the paint filling side cover 12 and the second cartridge 16. Is shown. Reference numeral 20 denotes a second paint discharge-side air chamber which is located in the second cartridge moving hole 14B and defined between the paint discharge-side lid 13 and the second cartridge 16.
Then, the second paint filling side air chamber 19 moves the second cartridge 16 to the paint discharge side lid 13 side as shown in FIG. On the other hand, the second paint discharge side air chamber 20 moves the second cartridge 16 toward the paint filling side lid 12 as shown in FIG.
Reference numeral 21 denotes guide rods that extend through the cartridge moving holes 14A and 14B of the cartridge housing cylinder 14 (shown in FIG. 11). Both ends of each guide rod 21 are supported by the lid bodies 12 and 13. The guide rods 21 are inserted into the cartridges 15 and 16 so as to be movable in the axial direction, thereby restricting the cartridges 15 and 16 from moving in the rotation direction.
Here, in the high voltage circuit breaker 11, the paint filling side cover 12 is formed of a conductive material, and the paint discharge side cover 13 and the cartridge housing cylinder 14 are formed of an insulating material. As a result, when the cartridges 15 and 16 are separated from the paint filling side cover 12 and arranged on the paint discharge side cover 13 side, that is, the discharge side from which the paint is discharged to the coating machine 2, these cartridges 15 and 16 are arranged. The cartridge located on the coating machine 2 side of 16 can be blocked from the ground potential. In addition, the conductive paint filling side cover 12 connected to the ground potential contacts the cartridges 15 and 16 moved to the filling side (paint filling side cover 12 side) filled with the paint. , 16 can be discharged to the ground potential.
Next, a valve device that is disposed in the high voltage circuit breaker 11 and performs filling, discharging, supply of extrusion liquid, supply of cleaning fluid, and the like will be described.
First, the paint filling side cover 12 constituting the high-voltage circuit breaker 11 includes a first connection switching valve 22, a first return side connection valve 23, located in a circle of the first cartridge moving hole 14 </ b> A, A first disposal side connection valve 24 is provided. These valves 22, 23, and 24 are respectively disposed so as to correspond to check valves 45, 46, and 47 described later provided in the first cartridge 15.
Here, as shown in FIG. 3, the first connection switching valve 22 has three passages 22B, 22C, and 22D in the valve casing 22A, and an air drive is provided at the junction of the passages 22B, 22C, and 22D. The valve body 22F operated by the operation part 22E of a type | formula is provided. The passage 22B can be connected to a first cartridge-side paint inflow passage 41 described later, the passage 22C is connected to the first flow passage 61B of the branch flow passage 61, and the passage 22D is connected to the first discharge flow passage 61C. ing.
As a result, the first connection switching valve 22 normally connects the first flow path 61B with the first discharge flow path 61C, and discharges the paint, cleaning thinner, and cleaning air to the waste liquid tank 62 described later. On the other hand, when the valve element 22F is displaced by the operation portion 22E, the first flow path 61B is communicated with the first cartridge-side paint inflow path 41, and the paint, cleaning thinner, and cleaning air are circulated to the first cartridge 15 side. Let
The first return side connection valve 23 has a passage 23B bent in an L shape in the valve casing 23A, and a valve body 23D operated by an air-driven operation portion 23C in the middle of the passage 23B. It has. The first return side connection valve 23 is normally in a closed state, and is opened when the extruded liquid in the extruded liquid storage chamber 15F of the first cartridge 15 is discharged.
Further, like the first return side connection valve 23, the first disposal side connection valve 24 is configured by a valve casing 24A, a passage 24B, an operation unit 24C, and a valve body 24D. The first disposal side connection valve 24 is normally in a closed state, and is opened when the paint and the cleaning fluid in the paint storage chamber 15E of the first cartridge 15 are discharged.
On the other hand, the paint filling side lid 12 is located within the circle of the second cartridge moving hole 14B, and is connected to the second connection switching valve 25, the second return side connection valve 26, and the second disposal side connection valve 27. Is provided. These valves 25, 26, and 27 are disposed so as to correspond to check valves 54, 55, and 56 described later provided in the second cartridge 16, respectively.
The second connection switching valve 25, the second return side connection valve 26, and the second discard side connection valve 27 are the first connection switching valve 22, the first return side connection valve 23, and the first Since these are configured in the same manner as the waste side connection valve 24, these valves 25, 26 and 27 are described with parentheses in FIG.
That is, the second connection switching valve 25 is roughly configured by a valve casing 25A, passages 25B, 25C, and 25D, an operation unit 25E, and a valve body 25F. The second return side connection valve 26 is roughly constituted by a valve casing 26A, a passage 26B, an operation portion 26C, and a valve body 26D. Further, the second disposal side connection valve 27 is roughly constituted by a valve casing 27A, a passage 27B, an operation portion 27C, and a valve body 27D.
Next, the coating material discharge side lid 13 constituting the high voltage circuit breaker 11 is provided with a first supply side connection valve 28 located in the circle of the first cartridge moving hole 14A, and the second cartridge A second supply side connection valve 29 is provided in the circle of the moving hole 14B. These supply side connection valves 28 and 29 are respectively arranged so as to correspond to extruded liquid inflow side check valves 48 and 57 described later provided in the first cartridge 15. Further, a cartridge selection valve 30 described later is provided at a substantially central portion of the paint discharge side lid 13.
Here, as shown in FIG. 5, the first supply side connection valve 28 is configured by a valve casing 28A, a passage 28B, an operation portion 28C, and a valve body 28D in the same manner as the first return side connection valve 23 described above. ing. The first supply side connection valve 28 is normally in a closed state, and is opened when supplying the extrusion liquid to the extrusion liquid storage chamber 15F of the first cartridge 15.
The second supply side connection valve 29 is configured in the same manner as the first supply side connection valve 28 by a valve casing 29A, a passage 29B, an operation portion 29C, and a valve body 29D, as shown in parentheses in FIG. Has been.
Reference numeral 30 denotes a cartridge selection valve provided at a substantially central portion of the paint discharge side lid 13. The cartridge selection valve 30 selects a cartridge located on the paint discharge side lid 13 side from the two cartridges 15 and 16 when painting, and connects the paint storage chamber to the coating machine 2. It is. Further, the cartridge selection valve 30 communicates a later-described cleaning valve device 72 and the coating machine 2 when cleaning the coating machine 2.
The cartridge selection valve 30 includes a first paint supply path 31 connected to the first cartridge 15 and a second paint supply path connected to the second cartridge 16 as shown in FIGS. 32, the first paint supply path 31 and the second paint supply path 32 merge to connect to the paint flow path 3 of the coating machine 2, and the coating machine cleaning fluid valve 59 is connected to the first paint supply path 31. A cleaning fluid passage 34 connected to the paint supply passage 31 and the second paint supply passage 32; a first paint supply valve 35 provided between the first paint supply passage 31 and the cleaning fluid passage 34; A first paint passage opening / closing valve 36 provided between the first paint supply passage 31 and the merging passage 33, and a first fluid passage 34 provided in the vicinity of the first paint supply valve 35 and provided in the cleaning fluid passage 34. 1 cleaning passage opening / closing valve 37, between the second paint supply passage 32 and the cleaning fluid passage 34. In the vicinity of the second paint supply valve 38 provided, the second paint passage opening / closing valve 39 provided between the second paint supply passage 32 and the merge passage 33, and the second paint supply valve 38. The second cleaning passage opening / closing valve 40 is located and provided in the cleaning fluid passage 34. The paint supply valves 35 and 38 are arranged at positions corresponding to paint outlet check valves 49 and 58 (described later) provided in the cartridges 15 and 16.
Here, the first paint supply valve 35 includes a valve casing 35A, passages 35B, 35C, and 35D, an operation unit 35E, and a valve body 35F, and the passages 35C and 35D are always in communication. The first paint supply valve 35 is normally kept open, and a first cartridge-side paint outflow path 43 and a first paint supply path 31 (described later) provided in the first cartridge 15 are connected to each other. Communicate. On the other hand, when cleaning the coating machine 2, the valve is closed to prevent the cleaning fluid from flowing out toward the passage 35B.
The first paint passage opening / closing valve 36 opens and closes the first paint supply passage 31 and the merging passage 33, and includes a valve casing 36A, a passage 36B, an operation portion 36C, and a valve body 36D. Has been.
Further, the first cleaning passage opening / closing valve 37 is opened when the coating machine 2 is cleaned. Like the first paint passage opening / closing valve 36, the valve casing 37A, the passage 37B, the operation portion 37C, It is comprised by the valve body 37D.
On the other hand, similarly to the first paint supply valve 35, the second paint supply valve 38 includes a valve casing 38A, passages 38B, 38C, and 38D, an operation unit 38E, and a valve body 38F. Similarly to the first paint passage opening / closing valve 36, the second paint passage opening / closing valve 39 includes a valve casing 39A, a passage 39B, an operation portion 39C, and a valve body 39D. Further, the second cleaning passage opening / closing valve 40 is configured by a valve casing 40A, a passage 40B, an operating portion 40C, and a valve body 40D, similarly to the first cleaning passage opening / closing valve 37.
Next, the paint, the cleaning thinner, the flow path of the cleaning air, the flow path of the extruded liquid, and the valve device that opens and closes these will be described.
First, the first cartridge 15 is provided with a paint inflow passage 41, an extrusion liquid passage 42, a paint outflow passage 43, and a paint disposal passage 44.
The first cartridge side paint inflow passage 41 extends from the paint filling side end plate 15A to the paint discharge side end plate 15B through the cylinder portion 15C, and its tip is bent to communicate with the paint containing chamber 15E. As shown in FIGS. 1 and 4, the paint inflow passage 41 is provided with a first flow path 61 </ b> B of a branch flow path 61, which will be described later, when the first cartridge 15 is disposed on the paint filling side lid 12 side. The paint, cleaning thinner, and cleaning air are caused to flow from the color change valve device 60 into the paint storage chamber 15E of the first cartridge 15.
The first cartridge side extruding liquid flow path 42 extends from the paint discharge side end plate 15B to the paint filling side end plate 15A through the cylinder portion 15C, and a midway portion branches to communicate with the extruding liquid storage chamber 15F. is doing. As shown in FIG. 2, when the first cartridge 15 is disposed on the paint discharge side lid 13 side (discharge side), the cartridge side extruding liquid channel 42 has an extruding liquid branch channel 66 described later. To the first internal flow path 66C. As a result, the cartridge-side extruded liquid channel 42 can cause the extruded liquid supplied from the extruded liquid supply device 64 to flow into the extruded liquid storage chamber 15 </ b> F of the first cartridge 15.
Further, the first cartridge side extruded liquid channel 42 is connected to an extruded liquid return channel 68 described later when the first cartridge 15 is disposed on the coating material filling side lid 12 (filling side). . As a result, the cartridge-side extruded liquid flow path 42 can cause the extruded liquid in the extruded liquid storage chamber 15 </ b> F of the first cartridge 15 to flow into the extruded liquid tank 65 described later.
Further, the first cartridge side paint outflow passage 43 includes a paint containing chamber 15E of the first cartridge 15 and a first paint outflow side check valve 49 described later provided on the other end face of the paint discharge side end plate 15B. Connected.
The first cartridge-side paint disposal flow path 44 extends from the cartridge-side paint outflow path 43 through the cylinder portion 15C and is connected to a first paint disposal-side check valve 47 provided on the paint filling side end plate 15A. Yes.
Next, a paint inflow side check valve 45, an extruded liquid outflow side check valve 46, and a paint disposal side check valve 47 are provided on the paint filling side end plate 15 </ b> A of the first cartridge 15. These check valves 45, 46, 47 are provided at positions corresponding to the valves 22, 23, 24 provided on the paint filling side lid 12 as shown in FIGS. 1 and 4.
The first paint inflow side check valve 45 is provided at the end of the paint inflow passage 41 and has a valve body 45B in a valve casing 45A as shown in FIG. 8, and the valve body 45B is provided by a valve spring 45C. The configuration is such that the valve is energized in the valve closing direction. In the state where the first cartridge 15 is separated from the paint filling side cover 12 and only in the state where the first cartridge 15 is only fitted to the first connection switching valve 22, the paint inflow check valve 45 is applied by the urging force of the valve spring 45C. The valve body 45B is kept in a closed state to prevent the paint from leaking from the first cartridge side paint inflow passage 41.
On the other hand, the first paint inflow side check valve 45 is in a state of being fitted to the first connection switching valve 22 and the valve body 22F of the first connection switching valve 22 is opened to communicate the passages 22B and 22C. When the valve opens. Accordingly, the check valve 45 allows the paint, cleaning thinner, and cleaning air supplied from the color change valve device 60 described later to flow into the paint containing chamber 15E of the first cartridge 15.
Further, the first extruded liquid outflow side check valve 46 is provided at the end of the extruded liquid flow path 42, and similarly to the above-described first paint inflow side check valve 45, the valve casing 46 </ b> A, the valve body 46 </ b> B, The spring 46C is generally configured. The first extruded liquid outflow side check valve 46 is normally closed. On the other hand, the check valve 46 is connected to the first return side connection valve 23 and opens together when the connection valve 23 is opened, so that the extruded liquid of the first cartridge 15 is contained. The extrusion liquid in the chamber 15F is allowed to flow out.
Further, the first paint disposal side check valve 47 is provided at the end of the paint disposal flow path 44, and similarly to the first paint inflow side check valve 45 described above, the valve casing 47A, the valve body 47B, the valve spring. This is roughly constituted by 47C. The first paint disposal side check valve 47 is normally closed. On the other hand, the check valve 47 opens together with the first disposal side connection valve 24 and when the connection valve 24 is opened. As a result, the check valve 47 discards (discharges) the paint and the like in the paint storage chamber 15E of the first cartridge 15 and the first cartridge-side paint disposal flow path 44.
Next, an extrusion liquid inflow side check valve 48 and a paint outflow side check valve 49 are provided on the paint discharge side end plate 15 </ b> B of the first cartridge 15. These check valves 48 and 49 are provided at positions corresponding to the supply side connection valve 28 provided on the paint discharge side lid 13 and the paint supply valve 35 of the cartridge selection valve 30 as shown in FIGS. ing.
The first extruding liquid inflow side check valve 48 is provided at the end of the extruding liquid flow path 42 as shown in FIG. 9 and the like, and like the first paint inflow side check valve 45 described above, the valve casing 48A, The valve body 48B and the valve spring 48C are generally configured. The first extruded liquid inflow side check valve 48 is normally closed. On the other hand, the check valve 48 is connected to the first supply side connection valve 28 and opens together when the connection valve 28 is opened. Thereby, the check valve 48 allows the extruded liquid supplied from the extruded liquid supply device 64 described later to flow into the extruded liquid storage chamber 15 </ b> F of the first cartridge 15.
Further, the first paint outflow side check valve 49 is provided at the end of the paint outflow passage 43, and similarly to the first paint inflow side check valve 45 described above, the valve casing 49A, the valve body 49B, and the valve spring 49C. It is roughly constituted by. The first paint outflow side check valve 49 is normally closed. On the other hand, the check valve 49 is opened by being connected to the first paint supply valve 35, and causes the paint to flow out from the paint storage chamber 15 </ b> E of the first cartridge 15 toward the coating machine 2.
Next, the paint, the cleaning thinner, the flow path of the cleaning air, the flow path of the extruded liquid, and the valve device that opens and closes these are provided in the second cartridge 16.
The second cartridge 16 is provided with a second paint inflow passage 50, a second extrusion liquid passage 51, a second paint outflow passage 52, and a second paint disposal passage 53. The configuration of the second cartridge 16 is the same as that of the paint inflow passage 41, the extrusion liquid passage 42, the paint outflow passage 43, and the paint disposal passage 44 of the first cartridge 15.
A paint inflow side check valve 54, an extruded liquid outflow side check valve 55, and a paint disposal side check valve 56 are provided on the paint filling side end plate 16 </ b> A side of the second cartridge 16.
The second paint inflow side check valve 54 includes a valve casing 54A, a valve body 54B, and a valve spring 54C, as in the case of the first paint inflow side check valve 45, as shown in parentheses in FIG. Yes. The second extruded liquid outflow side check valve 55 includes a valve casing 55A, a valve body 55B, and a valve spring 55C in the same manner as the first extruded liquid outflow side check valve 46 described above. Further, the second paint disposal side check valve 56 is configured by a valve casing 56A, a valve body 56B, and a valve spring 56C in the same manner as the first paint disposal side check valve 47 described above.
Further, an extruded liquid inflow side check valve 57 and a paint outflow side check valve 58 are provided on the paint discharge side end plate 16B side of the second cartridge 16.
As shown in parentheses in FIG. 9, the second extruded liquid inflow side check valve 57 has a valve casing 57A, a valve body 57B, and a valve spring 57C, similar to the first extruded liquid inflow side check valve 48 described above. It is comprised by. Similarly to the first paint outflow side check valve 49 described above, the second paint outflow side check valve 58 includes a valve casing 58A, a valve body 58B, and a valve spring 58C.
Reference numeral 59 denotes a cleaning fluid valve for a coating machine which is located in the vicinity of the cartridge selection valve 30 and is provided in, for example, the cartridge housing cylinder 14. The coating machine cleaning fluid valve 59 switches the flow direction of the cleaning thinner and cleaning air supplied from the cleaning valve device 72 to the paint discharge side or the waste liquid tank 62 side. Further, as shown in FIG. 6 and the like, the cleaning fluid valve 59 for the coating machine is similar to the first connection switching valve 22 described above, in the valve casing 59A, the passages 59B, 59C, 59D, the operation portion 59E, and the valve body 59F. It is roughly constituted by. The passage 59B is connected to the cleaning fluid passage 34 of the cartridge selection valve 30, the passage 59C is connected to the supply side passage 73A, and the passage 59D is connected to the discharge side passage 73B.
Thus, the coating machine cleaning fluid valve 59 is always in communication with a supply side channel 73A and a discharge side channel 73B of a cleaning fluid channel 73, which will be described later, and discharges cleaning thinner and cleaning air to the waste liquid tank 62 side. . On the other hand, when the valve body 59F is displaced by the operation unit 59E, the supply side flow path 73A is communicated with the cleaning fluid passage 34, and the cleaning thinner and the cleaning air are circulated to the coating machine 2 side.
Next, a configuration for supplying paint, cleaning thinner, and cleaning air to the cartridges 15 and 16 will be described.
Reference numeral 60 denotes a color change valve device as a color change means. The color change valve device 60 has a state before it remains on the cartridge 15 or 16 connected to the paint filling side, that is, the paint filling side lid 12 side. After the color paint is washed with washing thinner and washing air, the next color paint is filled. The color change valve device 60 is connected to the ground potential in the same manner as the paint filling side cover 12.
Here, the color change valve device 60 is composed of A color, B color,... N color paint valves 60A, 60B,... 60N, a cleaning thinner valve 60Th, and a cleaning air valve 60Ar. The paint valves 60A, 60B,... 60N are connected to the A, B,... N color paint sources, the cleaning thinner valve 60Th is connected to the cleaning thinner source, and the cleaning air valve 60Ar is the cleaning air source (both (Not shown). The color changing valve device 60 selectively supplies A, B,..., N colors of paint, cleaning thinner, and cleaning air to the first cartridge 15 or the second cartridge 16. .
Reference numeral 61 denotes a branch flow path provided between the color change valve device 60 and the high voltage circuit breaker 11. The branch flow path 61 includes a common flow path 61A that connects the color change valve device 60 and a color change direction selection valve 63 described later, and a color change direction selection valve 63 and a first portion provided in the paint filling side lid body 12. A first flow path 61B that connects the first connection switching valve 22, a first discharge flow path 61C that connects the first connection switching valve 22 and the waste liquid tank 62, the color change direction selection valve 63, and the paint. A second flow path 61D for connecting the second connection switching valve 25 provided in the filling side lid 12, and a second discharge flow path 61E for connecting the second connection switching valve 25 and the waste liquid tank 62; It is comprised by. Here, the waste liquid tank 62 is connected to the ground potential.
Reference numeral 63 denotes a color change direction selection valve provided between the color change valve device 60 and the high voltage circuit breaker 11 and provided in the branch flow path 61. The color change direction selection valve 63 distributes the paint, cleaning thinner, and cleaning air supplied from the color change valve device 60 to the cartridge 15 or 16 disposed on the paint filling side lid 12 side. Further, as shown in FIG. 10, the color change direction selection valve 63 has three passages 63B, 63C, 63D in the valve casing 63A, and an air-driven type is provided at the junction of the passages 63B, 63C, 63D. The valve body 63F operated by the operation part 63E is provided. The passage 63B is connected to the common flow passage 61A of the branch flow passage 61, the passage 63C is connected to the first flow passage 61B, and the passage 63D is connected to the second flow passage 61D.
As a result, the color change direction selection valve 63 normally causes the common flow path 61A to communicate with the first flow path 61B and causes the paint from the color change valve device 60 to flow to the first cartridge 15 side. On the other hand, the color change direction selection valve 63 operates the valve body 63F by the operation portion 63E to connect the common flow path 61A to the second flow path 61D, and to apply the paint from the color change valve device 60 to the second flow path. Distribute to the cartridge 16 side.
Next, a configuration for supplying the extrusion liquid to the cartridges 15 and 16 and extruding the filled paint will be described.
Reference numeral 64 denotes an extruding liquid supply device as a paint extruding means. The extrusion liquid supply device 64, when discharging the paint toward the coating machine 2, out of the cartridges 15 and 16, the extrusion liquid storage chamber 15F of the cartridges 15 and 16 disposed on the paint discharge side lid 13 side. The extrusion liquid is supplied to 16F. Further, the extrusion liquid supply device 64 is connected to the ground potential in the same manner as the paint filling side lid 12.
The extrusion liquid supply device 64 includes a positive displacement pump, for example, a gear type or piston type pump 64A, capable of maintaining a constant flow rate in accordance with the coating conditions such as the type of paint and the finished state. The suction side of the pump 64A is connected to an extruded liquid tank 65 in which the extruded liquid is stored via a suction pipe 64B. The extruded liquid tank 65 is also connected to the ground potential.
As the extrusion liquid, in order to prevent a high voltage applied to the paint from the high voltage generator 4 from leaking to the ground potential through the extrusion liquid, a solvent having a high insulation or electrical resistance value is used. ing.
Reference numeral 66 denotes an extruding liquid branch flow path provided between the extruding liquid supply device 64 and the high voltage circuit breaker 11. The extruding liquid branching channel 66 includes a common channel 66A that connects the discharge side of the pump 64A of the extruding liquid supply device 64 and an extruding liquid direction selection valve 67 described later, the extruding liquid direction selection valve 67, and the paint filling side. A first external flow path 66B for connecting the lid body 12, a first supply side connection valve 28 provided in the high voltage circuit breaker 11 and provided in the first external flow path 66B and the paint discharge side lid body 13; A first internal flow path 66C for connecting the extrusion liquid direction selection valve 67 and the paint filling side lid body 12, and the second external flow path provided in the high voltage circuit breaker 11. It is comprised by the 2nd internal flow path 66E which connects the path | route 66D and the 2nd supply side connection valve 29 provided in the coating material discharge side cover body 13. As shown in FIG.
Reference numeral 67 denotes an extruded liquid direction selection valve provided in the extruded liquid branch channel 66 located between the extruded liquid supply device 64 and the high voltage circuit breaker 11. Since the configuration of the extrusion liquid direction selection valve 67 is the same as that of the color change direction selection valve 63 described above, the code of the extrusion liquid direction selection valve 67 in FIG. In parentheses. That is, the extruded liquid direction selection valve 67 is roughly constituted by a valve casing 67A, passages 67B, 67C, 67D, an operation portion 67E, and a valve body 67F.
Here, the passage 67B is connected to the common flow passage 66A of the extruded liquid branch flow passage 66, the passage 67C is connected to the first external flow passage 66B, and the passage 67D is connected to the second external flow passage 66D. Thereby, the extrusion liquid direction selection valve 67 normally communicates the common flow path 66A with the first external flow path 66B, and distributes the extrusion liquid from the extrusion liquid supply device 64 to the first cartridge 15 side. On the other hand, the extrusion liquid direction selection valve 67 causes the common flow channel 66A to communicate with the second external flow channel 66D by operating the valve body 67F by the operation portion 67E, and allows the extrusion liquid from the extrusion liquid supply device 64 to be second. To the cartridge 16 side.
Reference numeral 68 denotes a first extruded liquid return flow path, and the extruded liquid return flow path 68 connects the first return side connection valve 23 and the extruded liquid tank 65. Reference numeral 69 denotes a second extruded liquid return flow path, and the extruded liquid return flow path 69 connects the second return side connection valve 26 and the extruded liquid tank 65.
Reference numeral 70 denotes a first waste flow path, and the waste flow path 70 connects the first waste side connection valve 24 and the waste liquid tank 62. Reference numeral 71 denotes a second waste flow path, and the waste flow path 71 connects the second waste side connection valve 27 and the waste liquid tank 62.
Next, a configuration in which cleaning thinner and cleaning air are supplied to the coating machine 2 in order to clean the fore-color paint staying and adhering to the coating machine 2 will be described.
Reference numeral 72 denotes a cleaning valve device as a coating machine cleaning means. The cleaning valve device 72 supplies cleaning thinner and cleaning air to the coating machine 2 after the coating is finished, and the forecolor paint that remains and adheres to the rotary atomizing head 2A, the paint discharge flow path 2B, etc. of the coating machine 2 Is to wash. Further, the cleaning valve device 72 is connected to the ground potential in the same manner as the paint filling side cover 12 and the like. The cleaning valve device 72 includes a cleaning thinner valve 72Th and a cleaning air valve 72Ar.
Reference numeral 73 denotes a cleaning fluid flow path provided in connection with the cleaning fluid valve 59 for the coating machine. The cleaning fluid flow path 73 includes a supply side flow path 73A through which cleaning thinner and cleaning air flow from the cleaning valve device 72 toward the coating machine cleaning fluid valve 59, and a waste liquid tank 62 from the coating machine cleaning fluid valve 59. And a discharge-side flow path 73B for discharging cleaning thinner and the like.
Next, a configuration for moving the two cartridges 15 and 16 alternately between the paint filling side position and the paint discharge side position will be described with reference to FIG.
In FIG. 11, reference numeral 74 denotes a cartridge moving device as cartridge moving means for moving the cartridges 15 and 16 in the cartridge moving holes 14A and 14B of the cartridge housing cylinder 14. The cartridge moving device 74 is configured to move the two cartridges 15 and 16 alternately to the paint filling side and the paint discharge side. The cartridge moving device 74 is connected to the ground potential in the same manner as the paint filling side cover 12.
That is, as shown in FIG. 1, the cartridge moving device 74 supplies the second cartridge 16 to the coating machine 2 when the first cartridge 15 is moved to the paint filling side lid 12 side where the paint is filled. Moved to the paint discharge side lid 13 side. Alternatively, as shown in FIG. 2, when the first cartridge 15 is moved to the paint discharge side lid 13 side, the second cartridge 16 is moved to the paint filling side lid 12 side. The cartridge moving device 74 is roughly constituted by a driving air supply device 75, air flow paths 76, 77, 78, 82, 83, driving air switching valves 79, 84, and flow rate adjusting valves 80, 81 to be described later.
Reference numeral 75 denotes a drive air supply device that supplies drive air serving as a power source for the cartridge moving device 74. The drive air supply device 75 includes an air source 75A, a pressure adjustment valve 75B, and the like. In addition, a branch air flow path 76 that is branched into a first flow path 76A and a second flow path 76B is connected to the pressure adjustment valve 75B.
Reference numeral 77 denotes a first filling-side air flow path that can communicate with the tip of the first flow path 76A of the branch air flow path 76 via a first drive air switching valve 79 described later. The first filling side air flow path 77 branches into a main flow path 77A and a sub flow path 77B, and the main flow path 77A extends from the paint filling side lid 12 to the first paint filling side air chamber 17. Communicate. On the other hand, the sub flow path 77B is positioned at a predetermined distance from the paint filling side lid 12, more specifically, when the first cartridge 15 moves to the paint filling side, the cartridge 15 moves to the paint discharge side lid 13 side. The cartridge opening 14 opens from the cartridge housing cylinder 14 to the inner surface of the first cartridge moving hole 14A at a position closed by the seal ring 15G just before it collides with the cartridge.
Similarly to the first filling-side air flow path 77, the first discharge-side air that can communicate with the tip of the first flow path 76A of the branch air flow path 76 via a first drive air switching valve 79 described later. The flow path is shown. The first discharge-side air flow path 78 branches into a main flow path 78A and a sub-flow path 78B, and the main flow path 78A extends from the paint discharge-side lid 13 to the first paint discharge-side air chamber 18. Communicate. On the other hand, the sub flow path 78B is opened from the cartridge housing cylinder 14 to the inner surface of the first cartridge moving hole 14A at a position separated from the coating material discharge side lid 13 by a predetermined dimension, in substantially the same manner as the sub flow path 77B described above. Yes.
Reference numeral 79 denotes a first drive air switching valve. The switching valve 79 is a first filling side air flow path 77 and a first discharge side air flow path with respect to the first flow path 76A of the branch air flow path 76. 78 is switchably connected. Thus, the drive air switching valve 79 switches the flow direction of the drive air supplied from the drive air supply device 75 to the first paint filling side air chamber 17 or the first paint discharge side air chamber 18. is there.
Reference numeral 80 denotes a main flow rate adjusting valve provided in each of the main channel 77A of the first filling side air channel 77 and the main channel 78A of the first discharge side air channel 78. These main flow rate adjusting valves 80 are for restricting the flow rate of the drive air by the throttle portion 80A when the drive air is discharged, and adjusting the moving speed of the first cartridge 15.
Reference numeral 81 denotes a sub flow rate adjusting valve provided in each of the sub flow path 77B of the first filling side air flow path 77 and the sub flow path 78B of the first discharge side air flow path 78. These sub flow rate adjusting valves 81 limit the flow rate of the driving air by the throttle portion 81A when discharging the driving air, and adjust the moving speed of the first cartridge 15. Here, the passage area of the throttle portion 81 </ b> A of the sub flow rate adjustment valve 81 is formed larger than the passage area of the throttle portion 80 </ b> A of the main flow rate adjustment valve 80.
Reference numeral 82 denotes a second filling-side air flow path that can communicate with the tip of the second flow path 76B of the branch air flow path 76 via a second drive air switching valve 84 described later. Similarly to the first filling side air flow path 77, the second filling side air flow path 82 branches into a main flow path 82A and a sub flow path 82B, and a main flow rate adjustment is provided in the main flow path 82A. A valve 80 is provided, and a sub flow rate adjusting valve 81 is provided in the sub flow path 82B.
Reference numeral 83 denotes a second discharge-side air flow path that can communicate with the distal end of the second flow path 76B of the branch air flow path 76 via a second drive air switching valve 84 described later. Similarly to the first discharge-side air flow path 78, the second discharge-side air flow path 83 branches into a main flow path 83A and a sub flow path 83B, and the main flow rate 83A has a main flow rate adjustment. A valve 80 is provided, and a sub flow rate adjusting valve 81 is provided in the sub flow path 83B.
In addition, in order to prevent the high voltage applied to the paint from leaking to the ground potential, the above-described air flow paths 77, 78, 82, and 83 use insulating pipes, hoses, and the like.
Reference numeral 84 denotes a second drive air switching valve. The switching valve 84 has a second filling side air flow path 82 and a second discharge side air flow path with respect to the second flow path 76B of the branch air flow path 76. 83 is switchably connected. Thereby, the drive air switching valve 84 switches the flow direction of the drive air from the drive air supply device 75 to the second paint filling side air chamber 19 or the second paint discharge side air chamber 20.
Here, the sub-flow channels 77B and 82B of the filling-side air flow channels 77 and 82 open to the inner peripheral surfaces of the cartridge moving holes 14A and 14B at positions spaced apart from the coating material-filling-side lid 12 by a predetermined dimension. Similarly, the sub-flow channels 78B and 83B of the discharge-side air flow channels 78 and 83 open to the inner peripheral surfaces of the cartridge moving holes 14A and 14B at positions spaced apart from the coating material discharge-side lid 13 by a predetermined dimension. Further, the flow passage area of the throttle portion 81A of the sub flow rate adjusting valve 81 provided in the sub flow channels 77B, 82B, 78B, 83B is formed larger than the passage area of the throttle portion 80A of the main flow rate adjusting valve 80. .
Thereby, in the cartridge moving device 74, the cartridges 15 and 16 move between the sub-flow paths 77B and 82B of the filling-side air flow paths 77 and 82 and the sub-flow paths 78B and 83B of the discharge-side air flow paths 78 and 83. When doing so, the cartridges 15 and 16 can be moved at high speed by the large flow rate of driving air passing through the two flow rate adjusting valves 80 and 81.
On the other hand, when the cartridges 15 and 16 approach the lids 12 and 13 and the seal rings 15G and 16G reach the openings of the sub flow paths 77B, 82B, 78B, and 83B, the drive air passes only through the main flow rate adjusting valve 80. become. Therefore, it is possible to prevent the cartridges 15 and 16 from moving at a low speed by the small flow rate of driving air and colliding with the lids 12 and 13.
Reference numeral 85 denotes a pressure detector, and the pressure detector 85 is connected to the air chambers 17, 18, 19, and 20 in the cartridge moving holes 14A and 14B. The pressure detector 85 outputs an abnormal signal to a control device (not shown) when the pressure in each of the air chambers 17, 18, 19, 20 exceeds the set allowable pressure range. Operates the alarm and stops painting work.
The electrostatic coating apparatus 1 according to the first embodiment has the above-described configuration. Next, the time shown in FIGS. 12 to 14 for the color changing work, the cleaning work, and the painting work by the electrostatic coating apparatus 1. This will be described with reference to the chart.
First, a cartridge moving process of moving the first cartridge 15 to the paint filling side lid 12 that is the filling side filled with the paint will be described. In this case, for example, when the N color painting process using the first cartridge 15 is completed, the first cartridge 15 is moved from the driving air supply device 75 of the cartridge moving device 74 to the first paint as shown in FIG. The inside of the first cartridge moving hole 14 </ b> A is moved toward the paint filling side lid 12 by the driving air (air pressure) flowing into the discharge side air chamber 18. And the 1st cartridge 15 is the state arrange | positioned at the coating material filling side cover body 12 side, and is filled with a coating material at the color change process mentioned later.
On the other hand, in the cartridge moving step, the second cartridge 16 is moved to the discharge side where the paint is discharged to the coating machine 2 in place of the first cartridge 15. That is, the second cartridge 16 is moved in the second cartridge moving hole 14B to the paint discharge side lid 13 by the drive air (air pressure) flowing from the drive air supply device 75 into the second paint filling side air chamber 19. Moved to. And the 2nd cartridge 16 discharges a coating material toward the coating machine 2 in the coating process mentioned later in the state arrange | positioned at the coating material discharge side cover body 13 side.
Next, a color change process for changing the color of the paint filling the first cartridge 15 will be described. The color changing process of the first cartridge 15 is performed in parallel with the painting process of the second cartridge 16.
First, in the color changing process, as shown in FIG. 13, the previous color (N color) paint remaining and adhering to the paint storage chamber 15E of the first cartridge 15, the first cartridge side paint inflow passage 41, and the like is washed. . In this cleaning process, the color change direction selection valve 63 connects the common flow path 61A of the branch flow path 61 to the first flow path 61B, and the first connection switching valve 22 connects the first flow path 61B to the first flow path 61B. Connected to the cartridge-side paint inflow passage 41. In addition, the first paint inflow side check valve 45, the first paint disposal side check valve 47, and the first disposal side connection valve 24 are opened.
In this state, by alternately opening the cleaning air valve 60Ar and the cleaning thinner valve 60Th of the color change valve device 60, the common flow path 61A of the branch flow path 61, the first flow path 61B, the first cartridge-side paint Cleaning air and cleaning thinner are supplied to the coating material storage chamber 15E of the first cartridge 15 through the inflow path 41 to clean the previous color (N color) coating material. Further, the cleaned paint and cleaning thinner are discharged to the waste liquid tank 62 through the first cartridge side paint outflow passage 43, the first cartridge side paint waste passage 44, and the first waste passage 70.
Next, when the cleaning process of the first cartridge 15 is completed, the process proceeds to an A color paint filling process in which, for example, A color paint is filled. In this A color paint filling process, the first extruded liquid outflow side check valve 46 and the first return side connection valve 23 are opened in order to freely move the piston 15D provided in the first cartridge 15. To do. In this state, the A color paint valve 60A of the color change valve device 60 is opened to fill the paint storage chamber 15E of the first cartridge 15 with the A color paint.
Here, in the A color paint filling process, the first paint waste side check valve 47 and the first waste side connection valve 24 are opened for a short time after the A color paint valve 60A is opened. . As a result, the A-color paint is filled up to the first cartridge-side paint disposal flow path 44, and bubbles and thinner remaining in the paint storage chamber 15E, the first cartridge-side paint outflow path 43, etc. during cleaning are discharged, and the painting work This prevents the paint containing air bubbles and thinner from being supplied to the paint discharge side.
When a predetermined amount of the A color paint is filled in the paint storage chamber 15E of the first cartridge 15, an A color paint washing process for washing the A color paint remaining in the branch flow path 61, the color change direction selection valve 63 and the like is performed. Do. In this A color paint cleaning process, the first connection switching valve 22 connects the first flow path 61B of the branch flow path 61 to the first discharge flow path 61C. In this state, by alternately opening the cleaning air valve 60Ar and the cleaning thinner valve 60Th of the color change valve device 60, the common channel 61A and the first channel of the branch channel 61 using the cleaning air and the cleaning thinner are used. The A color paint remaining on 61B, the color change direction selection valve 63, the first connection switching valve 22, etc. is discharged and washed. Thereby, the color changing process of the first cartridge 15 can be completed.
Here, when supplying cleaning air and cleaning thinner in the cleaning process of the N-color paint remaining in the first cartridge 15 and the cleaning process of the A-color paint remaining in the branch flow path 61, the cleaning is performed first and last. Supply air. This allows the initial cleaning air to extrude most paint. Further, the last cleaning air can prevent the cleaning thinner from remaining.
When the color changing process of the first cartridge 15 is completed in this way, the first cartridge 15 is moved to the paint discharge side lid 13 side as shown in FIG. On the other hand, the second cartridge 16 that has completed the painting process moves to the paint filling side lid 12 side.
Next, a coating process in which the A color paint filled in the first cartridge 15 is supplied to the coating machine 2 to perform coating will be described. The painting process of the first cartridge 15 is performed in parallel with the color changing process of the second cartridge 16.
First, in the painting process of the first cartridge 15, as shown in FIG. 14, a painting preparation process for filling the paint path with the A color paint is performed. In this coating preparation process, the extrusion liquid direction selection valve 67 connects the common flow path 66A of the extrusion liquid branch flow path 66 to the first external flow path 66B, and the first supply side connection valve 28 and the first extrusion liquid. The inflow side check valve 48, the first paint outflow side check valve 49, and the first paint supply valve 35 are opened.
In this state, by driving the extruded liquid supply device 64, the common flow channel 66A, the first external flow channel 66B, the first internal flow channel 66C, and the first cartridge side extruded liquid flow channel of the extruded liquid branch flow channel 66 are driven. A fixed amount of the extruded liquid is supplied to the extruded liquid storage chamber 15 </ b> F of the first cartridge 15 via 42. As a result, the piston 15D shrinks the paint storage chamber 15E, so that the A color paint in the paint storage chamber 15E flows into the first cartridge-side paint outflow passage 43 and the first paint supply passage 31 of the cartridge selection valve 30. Discharged.
At the end of the painting preparation process, the first paint passage opening / closing valve 36 and the paint valve 2C of the painting machine 2 are opened, so that the junction passage 33, the paint flow path 3 to the tip of the paint discharge flow path 2B. Can be filled with A color paint. And if a coating preparation process is complete | finished, it will be in a standby state until a to-be-coated article is conveyed.
Next, the coating material discharge process which performs coating using A color coating material is demonstrated. In this A color paint discharge process, the extrusion liquid direction selection valve 67 connects the common flow channel 66A of the extrusion liquid branch flow channel 66 to the first external flow channel 66B, and the first supply side connection valve 28, the first The extrusion liquid inflow side check valve 48, the first paint outflow side check valve 49, the first paint supply valve 35, the first paint passage opening / closing valve 36, and the paint valve 2C of the coating machine 2 are opened. Further, since a high voltage is applied to the coating machine 2 by the high voltage generator 4, a high voltage is applied to the A color paint flowing through the paint discharge flow path 2B of the coating machine 2 by direct charging. The
Here, the operation of the high voltage circuit breaker 11 will be described. The first cartridge 15 disposed on the paint discharge side lid 13 side for use in painting is applied to the coating machine 2 via the first paint supply path 31, the merge path 33, and the paint path 3 of the cartridge selection valve 30. It is connected to the. For this reason, the first cartridge 15 is charged to a high voltage via the paint filled in the aforementioned path.
On the other hand, the second cartridge 16 is disposed on the paint filling side lid 12 side when the A color paint filled in the first cartridge 15 is applied, and the whole is interposed via the paint filling side lid 12 and the like. Connected to earth potential. And the high voltage circuit breaker 11 forms the coating material discharge side cover body 13 and the cartridge accommodation cylinder 14 using an insulating material, and uses the solvent etc. which have insulation or a high electrical resistance value as extrusion liquid.
For this reason, the high voltage circuit breaker 11 can electrically separate the second cartridge 16 from the first cartridge 15 and the paint filling side lid body 12. Thereby, the high voltage circuit breaker 11 can prevent the high voltage applied to the A color paint from leaking to the ground potential through the paint.
Thus, by driving the extruding liquid supply device 64 in a state where high voltage leakage is prevented, the extruding liquid is quantitatively supplied to the extruding liquid storage chamber 15F of the first cartridge 15, and the A in the coating material storage chamber 15E is supplied. The color paint is discharged toward the coating machine 2.
Thereby, since the coating machine 2 discharges the A color paint from the paint discharge flow path 2B toward the rotary atomizing head 2A, the rotary atomizing head 2A The coating particles can be made to fly along the electric lines of force formed between the two to coat the object to be coated.
Next, when the coating of the object to be coated is completed, the process proceeds to a cleaning process for the A color paint remaining and adhered to the coating machine 2 and the like. In this coating machine cleaning step, the first cleaning passage opening / closing valve 37, the first paint passage opening / closing valve 36, and the coating material valve 2C are opened. The coating machine cleaning fluid valve 59 connects the supply-side channel 73 </ b> A of the cleaning fluid channel 73 to the cleaning fluid channel 34.
In this state, the cleaning air valve 72Ar and the cleaning thinner valve 72Th of the cleaning valve device 72 are alternately opened to supply the cleaning air and the cleaning thinner to the cleaning fluid valve 59 for the coating machine. 35, the first paint passage opening / closing valve 36, the first paint supply passage 31, the merging passage 33, the paint passage 3, the paint discharge passage 2B, and the A color paint remaining in the paint valve 2C by washing air and washing thinner. Wash.
In this coating machine cleaning process, for example, the cleaning paint is supplied to the first paint supply passage 31, the first paint supply valve 35, and the first paint passage opening / closing valve 36 by supplying the cleaning thinner last. . As a result, even if the A paint is left in the first paint supply passage 31, the first paint supply valve 35, and the first paint passage opening / closing valve 36, the filled cleaning thinner is not removed by the paint. The second cartridge 16 is used to prevent the cartridge 16 from being dried and fixed while performing the painting operation.
Next, when the coating machine cleaning process is completed, the process proceeds to a residual cleaning fluid discharge process. In this residual cleaning fluid discharging step, the coating machine cleaning fluid valve 59 connects the supply side channel 73A of the cleaning fluid channel 73 to the discharge side channel 73B. In this state, the cleaning air valve 72Ar of the cleaning valve device 72 is opened to discharge the cleaning thinner in the supply side flow path 73A and the discharge side flow path 73B to the waste liquid tank 62. As a result, the cleaning thinner is removed from the supply-side flow path 73A, and a high voltage is prevented from leaking to the ground potential through the cleaning thinner.
Thus, according to the first embodiment, the high-voltage circuit breaker 11 includes a cartridge housing cylinder having two cartridge moving holes 14A and 14B between the paint filling side lid 12 and the paint discharge side lid 13. 14 is provided in each of the cartridge moving holes 14A and 14B so that the cartridges 15 and 16 are movable between a filling side where the paint is filled and a discharge side where the paint is discharged to the coating machine 2. The paint filling side lid 12 is formed using a conductive material and connected to the ground potential. On the other hand, the coating material discharge side lid 13 and the cartridge housing cylinder 14 are made of an insulating material.
Thereby, among the cartridges 15 and 16, the cartridge disposed on the paint discharge side can electrically cut off a sufficient insulation distance from the paint filling side cover 12 connected to the ground potential.
As a result, the cartridge located on the paint filling side can be grounded and electrically insulated from the cartridge located on the paint discharge side, so that the high voltage applied to the paint is prevented from leaking to the ground potential. can do. Thereby, since a high voltage can be reliably applied to the paint, the paint can be efficiently applied to the object to be coated, and the coating quality, reliability, and the like can be improved.
In addition, the electrostatic coating apparatus 1 includes, for example, a cleaning operation of the first cartridge 15 by the color change valve device 60, a paint filling operation, a coating operation using the second cartridge 16 by the extrusion liquid supply device 64, and a cleaning valve device. The cleaning operation of the coating machine 2 by 72 can be performed in parallel.
Therefore, by alternately moving the two cartridges 15 and 16 by the cartridge moving device 74, it is possible to perform coating simultaneously even when the color of the paint is changed. Thereby, since the electrostatic coating apparatus 1 can perform a painting operation continuously alternately, it can improve productivity. Moreover, since a plurality of colors of paint can be continuously applied with only the two cartridges 15 and 16, it is not necessary to prepare a cartridge for each color, and the configuration can be simplified and the cost can be reduced.
Further, since the extrusion liquid supply device 64 uses an incompressible extrusion liquid to extrude the paint in the cartridges 15 and 16, it can supply the paint by a certain amount. Thereby, the spray pattern of a coating material can be stabilized, coating quality can be improved and reliability can be improved.
On the other hand, since the high voltage circuit breaker 11 can be provided separately from the coating machine 2, the coating machine 2 can be reduced in size and weight. Thereby, for example, even when a painting robot with a small output is used, the small coating machine 2 can be operated quickly. Further, the coating machine 2 that is reduced in size and weight can efficiently coat a narrow place such as the inside of an automobile.
Further, the color change valve device 60 and the extrusion liquid supply device 64 are configured to be used by switching to the two cartridges 15 and 16. As a result, since it is not necessary to prepare two color change valve devices 60 and extrusion liquid supply devices 64 corresponding to the two cartridges 15 and 16, the configuration can be simplified and the installation space can be reduced. Cost reduction can be achieved.
Next, FIG. 15 shows a second embodiment of the present invention. The feature of the present embodiment is that the paint extruding means is constituted by two extruding liquid supply devices for supplying extruding liquid, and these two extruding liquid supply devices are two cartridges constituting high voltage blocking means. The extrusion liquid is supplied separately. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
Reference numeral 91 denotes a first extrusion liquid supply device as a paint extrusion means. The extrusion liquid supply device 91 is provided exclusively for the first cartridge 15. Moreover, the 1st extrusion liquid supply apparatus 91 is comprised by the pump 91A and the suction pipe 91B similarly to the extrusion liquid supply apparatus 64 by 1st Embodiment.
Reference numeral 92 denotes a first extruded liquid supply flow path for connecting the pump 91A of the first extruded liquid supply apparatus 91 and the first supply side connection valve 28. A first branch channel 93 is provided in the middle of the extruded liquid supply channel 92. Reference numeral 94 denotes a first extruded liquid supply / discharge flow path connected to the first return side connection valve 23, and 95 denotes a first extruded liquid return flow connecting the extruded liquid supply / discharge flow path 94 to the extruded liquid tank 65. Each flow path is shown.
Reference numeral 96 denotes a first extruded liquid supply / discharge switching valve. The extruded liquid supply / discharge switching valve 96 is connected to the branch flow path 93, the extruded liquid supply / discharge flow path 94, and the extruded liquid return flow path 95. The extrusion liquid supply / discharge switching valve 96 is configured in the same manner as the extrusion liquid direction selection valve 67 according to the first embodiment. The first extruded liquid supply / discharge switching valve 96 connects the extruded liquid supply / discharge flow path 94 to the branch flow path 93 or the extruded liquid return flow path 95.
Here, when the first cartridge 15 is disposed on the discharge side from which the paint is discharged to the coating machine 2, the first supply side connection valve 28 and the first extruded liquid inflow side check valve 48 are connected. Open the valve. Thus, the first extruded liquid supply channel 92 communicates with the extruded liquid storage chamber 15F via the cartridge side extruded liquid channel 42 of the first cartridge 15. In addition, the first extruded liquid supply / discharge switching valve 96 passes through the first extruded liquid supply flow path 92 (first branch flow path 93) through the first extruded liquid supply / discharge flow path 94 and the first extruded liquid return. The flow path 95 is blocked. As a result, the extrusion liquid supplied from the first extrusion liquid supply device 91 flows into the extrusion liquid storage chamber 15F of the first cartridge 15 via the first extrusion liquid supply flow path 92. The coating material filled in 15E can be discharged toward the coating machine 2.
On the other hand, when the first cartridge 15 is disposed on the filling side where the paint is filled, the first extruded liquid supply / discharge switching valve 96 is connected to the first extruded liquid supply / discharge flow path 94 and the first branch flow path. 93 is connected. Thereby, the extruded liquid supplied from the first extruded liquid supply device 91 is stored in the first cartridge 15 via the extruded liquid supply channel 92, the branch channel 93, and the extruded liquid supply / discharge channel 94. It can flow into the chamber 15F. Accordingly, even when the first cartridge 15 is disposed on the filling side, the extruding liquid can flow into the extruding liquid storage chamber 15F to displace the piston 15D, and the fore-color paint remaining in the coating material storage chamber 15E can be removed. Can be discharged.
Reference numeral 97 denotes a second extruding liquid supply device as a paint extruding means, and the extruding liquid supply device 97 is provided exclusively for the second cartridge 16. Similarly to the first extruded liquid supply device 91, the second extruded liquid supply device 97 includes a pump 97A and a suction pipe 97B.
Further, the second extruded liquid supply flow path 98, the second branch flow path 99, the second extruded liquid supply / discharge flow path 100, the second extruded liquid return flow path 101, the second extruded liquid supply / discharge switching valve. Reference numeral 102 denotes a first extruded liquid supply channel 92, a first branch channel 93, a first extruded liquid supply / discharge channel 94, a first extruded liquid return channel 95, and a first extruded liquid supply / discharge switching. The configuration is the same as that of the valve 96. Since the switching operation using the second extrusion liquid supply / discharge switching valve 102 is the same as the switching operation using the first extrusion liquid supply / discharge switching valve 96, the description thereof will be omitted.
Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, according to the second embodiment, dedicated extrusion liquid supply devices 91 and 97 are provided for the two cartridges 15 and 16, respectively.
Thereby, the extrusion liquid is supplied from the extrusion liquid supply devices 91 and 97 to the extrusion liquid storage chambers 15F and 16F even in the color changing process in which the cartridges 15 and 16 are arranged on the paint filling side lid 12 side as the filling side. Thus, the previous color paint remaining in the paint chambers 15E and 16E can be discharged. As a result, when cleaning the previous color paint, the volume of the paint chambers 15E and 16E can be reduced, so that the amount of cleaning fluid used can be reduced and the cleaning operation can be performed efficiently in a short time. Workability can be improved.
In the first embodiment, the air flow paths 77, 78, 82, 83 constituting the cartridge moving device 74 are the main flow paths 77A, 78A, 82A, 83A and the sub flow paths 77B, 78B, 82B, 83B. For example, the main flow rate adjusting valve 80 is provided in each of the main flow paths 77A, 78A, 82A, and 83A, and the sub flow rate adjustment valve 81 is provided in each of the sub flow paths 77B, 78B, 82B, and 83B. And explained.
However, the present invention is not limited to this. For example, as in the modification shown in FIG. 16, the cartridge moving device 111 as the cartridge moving means has one air flow path 112, 113, 114, 115, respectively. It is good also as a structure which provides the flow regulating valve 116. In this case, the configuration can be further simplified to further reduce the cost. This configuration can be similarly applied to the second embodiment.
In the first embodiment, the cartridge moving device 74 includes a first driving air switching valve 79 for the first cartridge 15 and a second driving air switching valve 84 for the second cartridge 16. The case where was provided was illustrated. However, the present invention is not limited to this. For example, the first cartridge 15 and the second cartridge 16 may be alternately moved by one drive air switching valve. This configuration can be similarly applied to the second embodiment.
Moreover, in each embodiment, the color change valve device 60 and the color change direction selection valve 63 were described as an example in which the color change valve device 60 and the color change direction selection valve 63 are connected via the common flow path 61A of the branch flow path 61. However, the present invention is not limited to this. For example, the common flow path 61A may be omitted and the color change valve device 60 and the color change direction selection valve 63 may be integrally provided.
In each embodiment, the case where two cartridge moving holes 14A and 14B are provided in one cartridge housing cylinder has been described as an example. However, the present invention is not limited to this. For example, the cartridge housing cylinder may be constituted by two cartridge moving cylinders provided separately, and a cartridge moving hole may be provided in each cartridge moving cylinder.
Furthermore, in each embodiment, the case where the coating machine 2 is configured as a rotary atomizing head type coating machine including the rotary atomizing head 2A has been described as an example. However, the present invention is not limited to this. For example, another coating machine such as an air atomizing type coating machine or a hydraulic atomizing type coating machine may be provided.

Claims (8)

A coating machine (2) for spraying a charged paint to which a high voltage is applied by direct charging;
Two cartridges (15, 16) are provided which are movable on the filling side where the paint is filled and on the discharge side where the paint is discharged to the coating machine (2). Of these cartridges (15, 16), A high voltage blocking means (11) for blocking the coating material discharge side cartridge and the coating machine (2) from the ground potential;
Color changing means (60) for filling the next color paint after washing the previous color paint remaining in the paint filling side cartridge in the high voltage cut-off means (11) with a washing fluid;
Paint extrusion for supplying the extrusion liquid to the coating material discharge side cartridge in the high voltage cut-off means (11) to extrude the next color coating material filled in the coating material discharge side cartridge and supply it to the coating machine (2) Means (64, 91, 97);
It comprises cartridge moving means (74, 111) for alternately moving the two cartridges (15, 16) constituting the high voltage cutoff means (11) to the paint filling side position and the paint discharge side position. An electrostatic coating device. The high voltage cut-off means (11) includes a paint filling side cover (12) formed of a conductive material, a paint discharge side cover (13) formed of an insulating material or a conductive material, Two cartridge moving holes (14A, 14B) provided between the paint filling side lid (12) and the paint discharge side lid (13) and extending in parallel between the lids (12, 13) are provided. The cartridge housing cylinder (14) made of an insulating material and the two cartridges (15) provided movably in the cartridge movement holes (14A, 14B) of the cartridge housing cylinder (14). 16), and each of the cartridges (15, 16) has a paint chamber (15E, 16D) filled with the next color paint from the color changing means (60) by a movable partition wall (15D, 16D). 16E It said hydraulic means (64,91,97) extruding liquid chamber which is extruding liquid is supplied from (15F, 16F) and the electrostatic coating apparatus according to claim 1 comprising a structure defining. The high voltage cutoff means (11) includes a cartridge selection valve (30) for selecting a cartridge located on the paint discharge side from the two cartridges (15, 16) and connecting the cartridge to the coating machine (2). The electrostatic coating apparatus according to claim 1, wherein the electrostatic coating apparatus is configured to provide. The high voltage shut-off means (11) is a washing machine for washing the front color paint adhering to the painting machine (2) by supplying a washing fluid to the painting machine (2) after the painting is finished. The electrostatic coating apparatus according to claim 1, wherein the means (72) is provided. The color changing means (60) is constituted by a color changing valve device (60) for supplying a plurality of colors of paint and cleaning fluid, and between the color changing valve device (60) and the high voltage blocking means (11). The color change direction selection valve (63) which distribute | circulates a coating material and a washing | cleaning fluid toward the cartridge located in the coating material filling side among the two cartridges (15, 16) is provided. Electrostatic coating equipment. The paint extruding means (64) is constituted by an extruding liquid supply device (64) for supplying an extruding liquid. Between the extruding liquid supply device (64) and the high voltage shut-off means (11), the 2 The electrostatic coating apparatus according to claim 1, wherein an extruding liquid direction selection valve (67) that circulates the extruding liquid toward a cartridge located on the paint discharge side among the cartridges (15, 16) is provided. The paint extruding means (91, 97) is constituted by two extruding liquid supply devices (91, 97) for supplying extruding liquid, and the two extruding liquid supply devices (91, 97) 2. The electrostatic coating apparatus according to claim 1, wherein the extrusion liquid is separately supplied to the two cartridges (15, 16) constituting the blocking means (11). The high voltage shut-off means (11) defines air chambers (17 to 20) on both sides in the moving direction of the two cartridges (15, 16), and the cartridge moving means (74, 111) , A drive air supply device (75) for supplying drive air, and drive air supplied from the drive air supply device (75) to the air chamber (17-20) corresponding to the moving direction of the cartridge (15, 16). The electrostatic coating apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, comprising a drive air switching valve (79, 84) that flows into the air.

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