JPH105634A - Moiulticolor electrostatic coating machine and piping unit used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a multicolor electrostatic coating machine and to reduce the labor of piping work and connection work when a hose having a sufficient insulating distance is arranged in a housing even when a metallic coating material is supplied. SOLUTION: Since the rear end part of a machine body 6 to which high voltage is applied is covered with a bottomed cylindrical insulating barrier member 7, even if the machine body 6 and the barrier member 7 are allowed to approach the rear end part of a housing 3, both of them are held to an electrically insulated state and a multicolor electrostatic coating machine 1 can be miniaturized. A piping unit P is attached to the housing 3 and the both ends of the respective pipelines 9, 10 are connected to the respective color replacing valves (V) in the housing 3 and the respective connectors 15 arranged to the rear end part of the housing 3 to complete piping work and connection work to reduce the labor of those works. Since the pipeline 9 allowing a coating material to flow is spirally wound and fixed around the outer peripheral surface of the piping unit P, even if the housing 3 is made short, a sufficient insulating distance can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor electrostatic coating machine equipped with a color changing valve device for selectively supplying each color paint and a cleaning fluid to a rotary atomizing head, and more particularly to a conductive paint such as a metallic paint. It is suitable for performing electrostatic coating.

[0002]

2. Description of the Related Art In painting an automobile body, automobile hoods having different coating colors are conveyed on the same conveyor line, so that a multi-color electrostatic paint is applied so that each color paint can be separately applied by one painting machine. A painting machine is used.
FIG. 4 shows such a multicolor electrostatic coating machine 50 in which a rotary atomizing head 52 to which a high voltage of, for example, -120 kV is applied by a high voltage generator 51 is provided in a housing 53 at the tip. Air motor 54 for rotationally driving atomizing head 52
And a color changing valve device 55 having color changing valves V, V,... For selectively supplying each color paint and cleaning fluid to the rotary atomizing head 52. Further, at the rear end of the housing 53, there are formed connectors 57, 57,... For connecting hoses for supplying each color paint and the cleaning fluid from the paint supply source and the cleaning fluid supply source. Is connected to the replacement valve V via a hose 58,
The rear end of the housing 53 in which the connectors 57 are arranged and the rear end of the body 56 electrically connected to the rotary atomizing head 52 are separated by a predetermined insulation distance x.

When a metallic paint, in which metallic pieces are dispersed in the paint, is supplied to each color changing valve V through the hose 58 and painted, a high voltage is applied to the rotary atomizing head 52. In addition, the orientation of the metallic pieces dispersed in the paint tends to be uniform, and the bridging phenomenon in which the electric resistance decreases tends to occur. Once the bridging phenomenon occurs, the high voltage easily leaks through the metallic pieces. For this reason, the hose 58 through which the paint flows is spirally wound inside the housing 53 and is piped.
In this way, a sufficiently long insulation distance can be secured, so that the metallic paint in the hose 58 is unlikely to cause a bridging phenomenon over its entire length, and therefore, high voltage leakage can be prevented.

[0004]

However, the hoses 58 are required for the number of colors of the metallic paint supplied to the electrostatic coating machine 50, and must be wound in a spiral shape and housed in the housing 53. So the housing 5
There is a problem that it is difficult to handle the inside of the hose 3 and the piping work of the hoses 58, 58... Is troublesome.

The multicolor electrostatic coating machine 50 includes, in addition to the paints and cleaning fluids for each color, operating air for opening and closing each color changing valve V, turbine air for driving the air motor 54, brake air, shaping air, and bearings. Since a large number of fluids such as air are supplied, the connectors 57 for connecting these hoses are also formed for several minutes according to the type of the fluid. In order to reduce the size of the electrostatic coating machine 50, a large number of connectors 57 are placed in a narrow space.
The connection work between the connector 57 and the hose 58 housed in the housing 53 is extremely troublesome and troublesome.

On the other hand, in order to reduce the size of the electrostatic coating machine 50 and to reduce the work of piping and connecting hoses housed in the housing 53, as shown in FIG. Aircraft 56 electrically connected to 52
Is accommodated in a bottomed cylindrical insulating shield 60 provided with the opening 60a facing the rotary atomizing head 52, and along the inside of the cylindrical wall of the insulating shield 60. A paint pipe 61 is formed in the thick part of the cover, and connectors 57... For connecting hoses for supplying each color paint and the cleaning fluid from the paint supply source and the cleaning fluid supply source are formed at the rear end side. Since the paint pipe 61 is formed integrally with the connector 57, the paint pipe 61 is formed in the housing 53.
And the work of connecting the paint pipe 61 and the connector 57 is not required (Japanese Patent Application Laid-Open No. 7-232123,
No. 236839).

[0007] As shown in Japanese Patent Application Laid-Open No. 7-232123, if a paint pipe 61 composed of multiple pipes in which a plurality of insulating pipes having different diameters are arranged concentrically is used, one end of the multiple pipe is used. The paint that has flowed into the minimum diameter pipe from the side gradually flows toward the large diameter pipe while reversing the flow direction at both ends between the pipe walls, flows through the maximum diameter pipe, and flows out from the other end of the multiple pipe. Therefore, for example, if a triple pipe is used, the length of the flow path is three times the length of the paint pipe 61, and a sufficient insulation length can be secured even when painting with a metallic paint. .

However, when a paint pipe 61 composed of multiple pipes is used, the paint component tends to settle and harden at both ends where the flow of the paint reverses, and once the hardened paint component is peeled off and sprayed from the coating machine. A new problem arises in that cleaning work inside the paint pipe 61 must be frequently performed in order to cause a coating defect called "dust". Therefore, the present invention can reduce the size of the multicolor electrostatic coating machine, house hoses having a sufficient insulation distance even when performing coating with metallic paint, and simultaneously perform piping work for these hoses. Reduces connection work,
A technical problem is to make it possible to perform painting without causing defective painting such as dust.

[0009]

To solve this problem, the present invention provides an air motor for rotating a rotary atomizing head in a housing having a rotary atomizing head to which a high voltage is applied at the tip. And a color changing valve device for selectively supplying each color paint or cleaning fluid to the rotary atomizing head, a multi-color electrostatic coating machine provided with the rotary atomizing head. A bottomed cylindrical insulating shield that covers the rear end of the airframe conducted to the rear end of the airframe and maintains an electrical insulation state between the rear end of the airframe and the rear end of the housing has an opening formed in the bottom. Disposed toward the rotary atomizing head, and provided at the rear end of the housing are connectors for connecting hoses for supplying each color paint and a cleaning fluid from a paint supply source and a cleaning fluid supply source. Connector unit separated by a predetermined distance from the housing Each of the color change valves that are attached and constitute the color change valve device, and each of the connectors provided in the connector unit are connected via respective pipe lines formed in a pipe unit that is removably mounted in the housing. The pipe unit is formed such that each pipe is formed in the insulating shield, or each pipe is formed in an insulating cylindrical body loaded between the insulating shield and the housing. Is formed, and among the respective conduits, at least a conduit through which paint flows is spirally fixed in a circumferential direction along an outer peripheral surface of the insulating shield or the insulating tubular body. It is characterized by the following.

According to the present invention, the bottomed cylindrical insulating shield is disposed in the housing with its opening directed toward the rotary atomizing head, and is electrically connected to the rotary atomizing head. It is designed to cover the rear end of the fuselage.Even if the rear end of the fuselage and the rear end of the housing are brought close to each other, the two are electrically insulated by the insulating shield interposed therebetween. Maintained, and thus the overall length of the electrostatic coating machine can be reduced.

[0011] The piping in the housing is performed by using a piping unit having a pipe formed in the insulating shield or a piping unit having a pipe formed in an insulating tubular body inserted between the insulating shield and the housing. Both ends of each of the conduits are loaded into the housing, and both ends of each of the conduits are respectively connected to each of the color changing valves constituting the color changing valve device provided in the housing, and each connector of the connector unit provided at the rear end of the housing. Just connect. In this case, since the connector unit is attached at a predetermined distance from the housing, a working space for connecting the conduit to the connector is secured, and the connection work is extremely facilitated.

[0012] The pipe unit may be formed by forming each pipe in the insulating shield, or by forming each pipe in an insulating tubular body loaded between the insulating shield and the housing. Of these pipes, at least the pipes through which the paint is circulated are fixed in a spiral manner in the circumferential direction along the outer peripheral surface of the insulating shield or the insulating cylindrical body. It is housed between the body and the housing, or between the insulating tubular body and the housing, so that the winding is not unraveled in the housing and does not fall apart. Furthermore, since the conduit for flowing the paint is spirally wound, even if the length of the housing is short, the length of the conduit is set to a length sufficient to secure the insulation distance,
No bridging occurs when supplying the metallic paint, and therefore no high voltage leakage occurs. Furthermore, when the pipe is spirally wound, the flow of the paint does not stagnate in the pipe and the paint components do not settle, so that there is no coating defect such as dust.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a multicolor electrostatic coating machine according to the present invention, FIG. 2 is a partial sectional view showing a piping unit thereof, and FIG. 3 is a partial sectional view showing another example of a piping unit.

The multicolor electrostatic coating machine 1 of the present embodiment has a rotary atomizing head 2 to which a high voltage is applied, and a housing 3 having a tip disposed at a tip thereof.
A machine body 6 including an air motor 4 for rotatingly driving the rotary atomizing head 2 and a color changing valve device 5 for selectively supplying each color paint or cleaning fluid to the rotary atomizing head 2 is provided. Reference numeral 7 denotes a bottomed cylindrical insulating shield covering the rear end of the body 6 electrically connected to the rotary atomizing head 2, with its opening 7 a facing the rotary atomizing head 2. The housing 3 is disposed inside the housing 3 so as to maintain an electrically insulated state between the rear end of the body 6 and the rear end of the housing 3.

Here, when the color changing valve device 5 is provided at the rear end side of the body 6, the color changing valve device 5 is provided.
Fluid inflow channel 8 connected to each color changing valve V constituting
The connection piping unit 8 in which the in and the fluid outflow channel 8out are formed in a thick portion in the cylindrical wall of the cylindrical body 8a is connected to the color changing valve device 5.
And the insulating shield 7 covering the same, the flow path 8in, 8out connected to the color changing valve V is provided.
Extends to the opening 7 a of the insulating shield 7. In addition, connection ports 11in and 11out connected to respective pipes 9 and 10 formed in a piping unit P, which will be described later, are formed at the ends of the flow paths 8in and 8out.

The piping unit P of the present embodiment is formed by forming respective pipes 9 and 10 on an insulating tubular body 12 loaded between the insulating shield 7 and the housing 3. Among them, the pipe 9 through which the paint flows is spirally wound and fixed in the circumferential direction along the outer peripheral surface 12a of the insulating tubular body 12, and opens and closes other fluids, for example, the color changing valves V. Flow paths for operating air, turbine air for driving the air motor 4, brake air therefor, shaping air, bearing air, and the like are formed so as to linearly penetrate a thick portion in the cylindrical wall of the insulating cylindrical body 12. .

As shown in FIG. 2, the pipe unit P is provided with a guide groove 13 for winding the pipe 9 through which the paint flows on the outer peripheral surface 12a of the insulating tubular body 12. In a state where the pipe 9 is spirally formed along the guide groove 13 and is covered with a heat-shrinkable tube 14 in a non-shrink state, the heat-shrinkable tube 14 is thermally shrunk. Each pipe 9 is fixed to the insulating tubular body 12.

A connector unit is provided at the rear end of the housing 3 for connecting connectors 15, 15,... For connecting hoses for supplying each color paint and cleaning fluid from a paint supply source and a cleaning fluid supply source. C are mounted at predetermined intervals from the housing 3 via a rod 16, and each color change valve V constituting the color change valve device 5 and each connector 15, 15...
Are connected to each other through respective pipe lines 9 and 10 formed in a pipe unit P which is inserted into and detached from the housing 3. Here, since the connector unit C is attached away from the housing 3 by the length of the rod 16, the conduits 9, 10 of the piping unit P loaded in the housing 3 are pulled out from the housing 3, and the connector 15 When connecting to the rod 1
A work space corresponding to the length of 6 is secured. In addition, 1
Reference numeral 7 denotes a high-voltage generator molded in an insulating shield 7;
8 is the power cable.

The above is an example of the configuration of the present invention, and its operation will now be described. First, the connection pipe unit 8 having the flow paths 8in and 8out connected to the color change valves V is mounted on the color change valve device 5 located on the rear end side of the body 6 and housed in the insulating shield 7. Then, the piping unit P is mounted on the outside thereof. The front ends of the pipes 9 and 10 formed in the pipe unit P are connected to the connection ports 11 formed at the ends of the flow paths 8 in and 8 out of the connection pipe unit 8.
After connecting to in and 11out, the housing 3 is further covered from outside.

At this time, since the pipe 9 wound around the outer peripheral surface 12a of the insulating tubular body 12 is fixed to the insulating tubular body 12 by the heat-shrinkable tube 14, the pipe unit P The housing 3 can be smoothly covered without unwinding and falling apart. Further, even if the heat-shrinkable tube 14 is torn when the housing 3 is covered, since each pipe 9 is wound along the guide groove 13, it is difficult to come off from the guide groove 13, and the housing 3 is further covered. Even if the pipe 9 is later unwound, each pipe 9
Is housed between the housing 3 and the insulating tubular body 12, so that it does not fall apart or dance in the housing 3.

Next, by pulling out the rear ends of the conduits 9 and 10 formed in the piping unit P to the rear of the housing 3 and connecting them to the connectors 15 of the connector unit C, the piping work and the connection work are performed. Is completed. In this case, since the connector unit C is attached to the rear end of the housing 3 by a distance corresponding to the length of the rod 16, the pipes 9, 10 of the piping unit P are connected to the connector 15 by the connector 15.
When the connection is made, not only the work space is secured, but also the work can be performed while visually checking the connection state, so that the connection can be made easily and securely.

Then, hoses for supplying each color paint and the cleaning fluid from the paint supply source and the cleaning fluid supply source are connected to the respective connectors 15, 15,..., And the air motor 4 is driven to drive the rotary atomizing head 2. Rotating atomizing head 2 while rotating at high speed
When a high voltage is applied to the nozzle and the paint is supplied by opening an arbitrary color changing valve V, the paint is sprayed from the rotary atomizing head 2 via the color changing valve V through the spirally wound pipe 9. You.
At this time, a high voltage is applied to the rear end of the body 6 that is electrically connected to the rotary atomizing head 2, but the body 6 is housed in the insulating shield 7 and the rear end of the body 6 Section and the rear end of the housing 3 are maintained in an electrically insulated state, so that even when the rear end of the body 6 and the rear end of the housing 3 are brought close to each other, the rear end of the housing 3 is kept at the ground potential. Therefore, the total length of the electrostatic coating machine 1 can be shortened and the size can be reduced accordingly. Further, since the pipe 9 for flowing the paint of the piping unit P is spirally wound, the flow of the paint does not stagnate and the paint component does not settle in the pipe 9, and paint defects such as dust are found. Does not occur.

In the above description, a case has been described in which the pipes 9 and 10 are formed as the piping unit P in the insulating cylindrical body 12 loaded between the insulating shield 7 and the housing 3. A case where a pipe unit is formed by forming a pipe in the body 7 may be used. Further, the case where the pipe 9 is fixed to the insulating tubular body 12 by using the heat-shrinkable tube 14 has been described. However, the present invention is not limited to this, and may be fixed with an adhesive. obtain.

FIG. 3 is a perspective view showing another piping unit used in the multicolor electrostatic coating machine of the present invention. In this embodiment, of the pipes 9 and 10 formed in the piping unit P, At least a plurality of pipes 9, 9,... Through which the paint flows are formed by a composite pipe 21 bundled in a flat cable shape, and spirally wound in the circumferential direction along the outer peripheral surface 12a of the insulating tubular body 12. Each of the pipes 9, 9,... Is formed by the heat-shrinkable tube 14 coated on the outside thereof.
It is fixed to 2. In this case, the insulating tubular body 12 is also used.
Instead, it may be wound and fixed to the outer peripheral surface of the insulating shield 7. Further, the means for fixing the pipes 9, 9,... Is not limited to the case where the heat-shrinkable tube 14 is used, but may employ an adhesive or other arbitrary means.

[0025]

As described above, according to the present invention, the bottomed cylindrical insulating shield is disposed in the housing with its opening facing the rotary atomizing head, and Since the rear end of the fuselage electrically connected to the head is covered, even if the rear end of the fuselage is brought close to the rear end of the housing, the insulating shield interposed therebetween is provided. The body keeps both electrically insulated, so that the total length of the electrostatic coating machine can be shortened and downsized, and the piping work in the housing has formed a conduit in the insulating shield. A piping unit or a piping unit in which a pipe is formed in an insulating tubular body loaded between an insulating shield and a housing is loaded into the housing, and both ends of each of the pipes are disposed in the housing. Color change valve and housing that make up the color change valve device The connection is completed only by connecting to each connector of the connector unit disposed at the end, and in this case, since the connector unit is mounted at a predetermined distance from the housing, the pipe line is connected to the connector. In this case, a work space can be secured, and the pipe work and the associated pipe connection work can be extremely easily performed. Furthermore,
Since the pipe through which the paint of the piping unit flows is spirally wound, there is no stagnation of the paint flow or settling of the paint component in the pipe, and no coating defects such as bumps occur. There is also an effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a multicolor electrostatic coating machine according to the present invention.

FIG. 2 is a partial sectional view showing a piping unit used for this;

FIG. 3 is a partial sectional view showing another piping unit used for this.

FIG. 4 is a schematic configuration diagram showing a conventional device.

FIG. 5 is a schematic configuration diagram showing a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multi-color electrostatic coating machine 2 ... Rotary atomizing head 3 ... Housing 4 ... Air motor 5 ... Color changing valve device 6 ... Machine body 7 ... Insulation shield 7a.・ The opening V ・ ・ ・ Color change valve 8in ・ ・ Fluid inflow channel 8 ・ ・ ・ Connection piping unit P ・ ・ ・ Piping unit 9,10 ・ ・ Pipe line 11in 、 11out ・ ・ Connection port 12 ・ ・ ・ Insulation Cylindrical body 12a Outer peripheral surface 13 Guide groove 14 Heat shrink tube 15 Connector C Connector unit

Claims (7)

[Claims] An air motor (4) for rotating the rotary atomizing head (2) and a paint for each color are provided in a housing (3) having a rotary atomizing head (2) to which a high voltage is applied at an end thereof. In a multicolor electrostatic coating machine in which a body (6) including a color changing valve device (5) for selectively supplying a cleaning fluid to a rotary atomizing head (2) is provided, in the housing (3), While covering the rear end of the body (6) electrically connected to the rotary atomizing head (2),
A bottomed cylindrical insulating shield (7) for maintaining an electrically insulated state between the rear end of the body (6) and the rear end of the housing (3) has its opening (7a) closed. A hose for supplying each color paint and a cleaning fluid from a paint supply source and a cleaning fluid supply source is connected to a rear end of the housing (3). A connector unit (C) provided with each connector (15) is attached at a predetermined distance from the housing (3); each color change valve (V) constituting the color change valve device (5); and the connector unit Each connector (15) disposed in (C) is connected to each other via respective pipes (9, 10) formed in a piping unit (P) that is removably loaded into the housing (3). The piping unit (P) is connected to the insulating shield ( Each pipe (9, 10) is formed in 7), or each pipe (9, 10) is provided in the insulating tubular body (12) loaded between the insulating shield (7) and the housing (3). 10) is formed, and at least one of the pipes (9, 10) through which the paint flows is formed by the outer periphery of the insulating shield (7) or the insulating tubular body (12). A multicolor electrostatic coating machine characterized by being spirally wound and fixed in a circumferential direction along a surface. 2. The color change valves (V) constituting the color change valve device (5) are housed in the bottomed cylindrical insulating shield (7) and connected to the color change valves (V). Channels (8in, 8out) are extended to the opening (7a) of the insulating shield (7), and at the tip of the fluid inflow channels (8in, 8out), the pipe unit (P) is connected. Each formed conduit (9,
2. The multi-color electrostatic coating machine according to claim 1, wherein connection ports (11in, 11out) connected to (10) are formed. 3. A plurality of pipes (9) through which at least paint is circulated along the outer peripheral surface of the insulating shield (7) or the insulating tubular body (12) constituting the piping unit (P). 2. The multicolor electrostatic coating machine according to claim 1, wherein the winding guide groove (13) is formed in a spiral shape with a number of the number of the grooves. 4. The pipe unit (P), wherein at least a pipe line (9) through which paint flows is formed by the insulating shield (7).
Alternatively, the pipe (9) may be wound spirally in the circumferential direction along the outer peripheral surface of the insulating tubular body (12), and the pipe (9) may be in a contracted state outside the insulating pipe (7) or insulated. The multicolor electrostatic coating machine according to claim 1, wherein the heat-shrinkable tube (14) fixed to the tubular body (12) is covered. 5. In a state in which at least a plurality of pipes (9) for flowing paint among the pipes (9, 10) formed in the pipe unit (P) are bundled in a flat cable shape, Insulating shield (7) or said insulating tubular body (12)
2. The multicolor electrostatic coating machine according to claim 1, wherein the multicolor electrostatic coating machine is spirally wound and fixed in the circumferential direction along the outer peripheral surface of the multicolor electrostatic coating machine. 6. An air motor (4) for rotating and driving the rotary atomizing head (2) in a housing (3) having a rotary atomizing head (2) to which a high voltage is applied at its tip, and a paint for each color. And a color changing valve device (5) for selectively supplying a cleaning fluid to the rotary atomizing head (2). A paint supply source and a paint supply source are provided at the rear end of the housing (3). Connector unit (C) provided with connectors (15) for connecting hoses for supplying each color paint and cleaning fluid from the cleaning fluid supply source
Are mounted on a multicolor electrostatic coating machine (1) mounted at a predetermined distance from the housing (3), and each color changing valve (V) and the connector unit constituting the color changing valve device (5) are mounted. (C) a piping unit for connecting each of the connectors (15), wherein an electrical insulation state can be maintained between a rear end of the body (6) and a rear end of the housing (3). The opening (7a) is directed toward the rotary atomizing head (2) so as to cover the rear end of the body (6), or the bottomed cylindrical insulating shield (7) or the insulating shield ( Each pipe (9, 10) is formed in an insulating cylindrical body (12) loaded between the housing (3) and the insulating shield (7) or the insulating cylindrical body (12). ), A plurality of pipes (9) through which at least the paint flows among the pipes (9, 10) are wound around the outer circumference. The groove (13) is formed in a spiral shape with a number corresponding to the number of the grooves, and is formed by winding and fixing a pipe (9) through which paint flows along the guide groove (13). Piping unit. 7. An air motor (4) for rotating and driving the rotary atomizing head (2) in a housing (3) having a rotary atomizing head (2) to which a high voltage is applied at its tip, and a paint for each color. And a color changing valve device (5) for selectively supplying a cleaning fluid to the rotary atomizing head (2). A paint supply source and a paint supply source are provided at the rear end of the housing (3). Connector unit (C) provided with connectors (15) for connecting hoses for supplying each color paint and cleaning fluid from the cleaning fluid supply source
Are mounted on a multicolor electrostatic coating machine (1) mounted at a predetermined distance from the housing (3), and each color changing valve (V) and the connector unit constituting the color changing valve device (5) are mounted. (C) a piping unit for connecting each of the connectors (15), wherein an electrical insulation state can be maintained between a rear end of the body (6) and a rear end of the housing (3). The opening (7a) is directed toward the rotary atomizing head (2) so as to cover the rear end of the body (6), or the bottomed cylindrical insulating shield (7) or the insulating shield ( Each pipe (9, 10) is formed in an insulating tubular body (12) loaded between 7) and the housing (3), and at least paint is distributed among the pipes (9, 10). A pipe (9) to be made extends in the circumferential direction along the outer peripheral surface of the insulating shield (7) or the insulating tubular body (12). While being wound in a spiral shape, the outside thereof is covered with a heat-shrinkable tube (14) for fixing the pipe (9) to the insulating shield (7) or the insulating tubular body (12) in a contracted state. A piping unit characterized by the above-mentioned.