JPH07265758A - Automatic coating machine - Google Patents

Abstract

PURPOSE:To treat pipes simply by reducing the number of pipes for supplying compressed air from an air supply source and to downsize the entire coating machine by saving a piping space. CONSTITUTION:In an automatic coating machine in which a color changing apparatus 6 equipped with color changing valves V1-Vn for supplying a paint of selected color supplied from a paint supply source to a coating machine 5 is installed in a vertically movable body 3 which supports the coating machine 5 to be able to move vertically, controlling air supply pipes P1-Pn for supplying controlling air for turning on or off the color changing valves V1-Vn branch off from a main supply pipe 14 for supplying compressed air corresponding to the number of the color changing valves V1-Vn to be connected to the color changing valves V1-Vn through solenoid valves E1-En. The solenoid valves E1-En are placed in a positively pressurized explosion-proof box 18 which maintains pressure higher than the atmospheric pressure to be installed in the vertically movable body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color changing device provided with a color changing valve for selectively selecting each color paint supplied from a paint supply source and supplying it to a coating machine, which enables the coating machine to move up and down. The present invention relates to an automatic coating device attached to a supporting lifting body.

[0002]

2. Description of the Related Art For example, an automatic coating apparatus for coating a roof surface of an automobile body or the like is equipped with an elevator cradle arranged so as to traverse a conveyor for transporting an automobile body to be coated.
An electrostatic coating machine is attached at a predetermined interval, and the lifting platform is moved up and down according to the height of the object to be coated so that the distance from the surface to be coated is kept constant. In this case, since car bodies of different paint colors are mixed and conveyed on the same conveyor, a color changing device is provided for each coater, and the paint color specified for each object to be coated is provided. The paint is selected by a color changing device to apply the paint.

[0003]

However, for example, when changing the color of 10 colors of paint, the color changing device requires at least 10 colors of color changing valves, a cleaning solvent valve and a cleaning air valve. Since each valve is opened and closed by supplying control air for explosion protection,
At least twelve hoses for supplying control air are required, and there is a problem that a wasteful piping space must be secured and the entire coating apparatus becomes large.

Moreover, the hose for supplying the control air is
The pipe was cumbersome because it could not be bent with a small radius because it was made quite sturdy so that it would not collapse when bent. Further, when a large number of hoses are bundled together for piping, the hoses may be rubbed against each other and pulled, or an external force may be applied as the elevating body moves up and down to break and break. Therefore, according to the present invention, the number of air supply pipes for supplying compressed air from an air supply source can be reduced, and the pipe processing can be performed extremely easily, and at the same time, the pipe space can be saved and the entire coating apparatus can be downsized. Is a technical issue.

[0005]

In order to solve this problem, the present invention relates to a color provided with a color change valve which selectively selects each color paint supplied from a paint supply source and supplies it to a coating machine. In the automatic painting apparatus, in which the changing device is attached to an elevating body that supports the painting machine so that the painting machine can move up and down, a control air supply pipe that supplies control air that turns on and off each of the color changing valves is a main supply pipe that supplies compressed air. Connected to each color change valve via a solenoid valve, and each solenoid valve is housed in a positive pressure explosion-proof box maintained at a pressure higher than the outside and distributed to the lifting body. It is characterized by being set up.

[0006]

According to the present invention, the control air supply pipe for supplying the control air for turning on / off each color change valve is formed by branching from the main supply pipe supplying the high pressure air from the air supply source by the number of color change valves. Therefore, compressed air is supplied to the vicinity of the coating machine with only one main supply pipe, the air supply hose does not become bulky, the piping process is simple, and the entire coating apparatus is downsized. In addition, it is configured to open and close any solenoid valve interposed in each control air supply pipe,
Since it is only necessary to connect wires that are easy to wire,
Connecting these wires does not cause any inconvenience in wiring. Further, since each of the solenoid valves is housed in the positive pressure explosion-proof box, even if the solenoid valve is arranged in an organic solvent atmosphere, legal explosion-proof measures are taken and there is no problem in safety. Furthermore, the positive pressure explosion-proof box does not have to be so sturdy, it can be made small and lightweight, and an opening such as a lid can be provided, so that maintenance can be performed easily.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a flow sheet showing a main part of an automatic coating device according to the present invention, and FIG. 2 is a front view showing the whole thereof.

In the figure, reference numeral 1 denotes an automatic painting apparatus called a top machine for painting a roof surface of an automobile body.
Both ends of an elevating platform (elevating body) 3 arranged so as to traverse the conveyor 2 that conveys the article to be coated W are supported by columns 4R and 4L that are erected on the left and right, and the height of the article W to be coated is It is configured to be moved up and down accordingly. Further, for example, three coating machines 5 are arranged at predetermined intervals along the longitudinal direction on the elevating stand 3, and each color paint supplied from a paint supply source is selectively supplied to each paint machine 5. The color changing device 6 for selecting is connected.

The coating machine 5 at the center has a base 8 screwed onto a ball screw 7 arranged along the longitudinal direction of the lift base 3.
The coating machines 5 and 5 on both the left and right sides are mounted on a, so that the positions of the coating machines 5 and 5 on the left and right can be adjusted to the left and right by the cylinders 9 arranged on the 8b and 8c that slide integrally with the base. The base 8 is driven by forward and reverse rotation.
Is moved to reciprocate all the coating machines at a predetermined stroke all at once, and the cylinders 9 are expanded and contracted so that the intervals between the coating machines 5 can be adjusted. Further, the color changing device 6 is attached at a predetermined position in the elevating stand 3, and a manifold 11 having a plurality of color changing valves V _{1 to} Vn, a washing solvent valve Vt, and a washing air valve Va is coated via a flexible pipe 12. Connected to machine 5.

P _{1 to} Pn, Pt and Pa are control air supply pipes for supplying control air for turning on / off the valves V _{1 to} Vn, Vt and Va, and supply high pressure air from an air supply source 13. The main supply pipe 14 is branched by the number of valves and connected to the respective valves V _{1 to} Vn, Vt, Va via electromagnetic valves E _{1 to} En, Et, Ea. Each solenoid valve E
_{1 ~En,} Et, power cable 15 for supplying power to on-off operation of Ea is connected via a remote switch 16 each of the solenoid valves E _{1 ~En,} Et, the Ea.

In addition to the power cable 15, the remote switch 16 includes solenoid valves E ₁ to
A signal line 17 for supplying an electric signal for specifying En, Et, Ea is connected, and for example, when the color change valve V ₁ is to be opened, the solenoid valve E ₁ is supplied with power and opened to supply control air. Control air is supplied from the pipe P ₁ to the color change valve V ₁ .

Reference numeral 18 denotes a positive pressure explosion-proof box arranged on the lifting platform 3, in which the main supply pipe 14 is provided.
Branches and the electromagnetic valves E ₁ ~En, Et, Ea, is formed so as to accommodate the remote switch 16. Further, the main supply pipe 14 is formed with a branch pipe 19 for leaking compressed air into the box 18, so that the atmospheric pressure in the box 18 is maintained higher than the outside, so that the organic solvent in the outside atmosphere, etc. Highly flammable gas does not enter inside.

The above is an example of the configuration of the present invention, and its operation will be described below. For example, the case of coating with white paint supplied from the color change valve V ₁ will be described.
First, each cylinder 9 is expanded and contracted to adjust the interval of the coating machine 5 according to the width of the object W to be coated, and the ball screw 7 is rotated by the motor 10.
To drive the coating machines 5 back and forth with a predetermined stroke.

Then, the signal line 1 is connected to the remote switch 16.
When the electrical signal to the effect that opening the solenoid valve E ₁ is supplied through the 7, since the electromagnetic valve E ₁ from the remote switch 16 is supplied power to the solenoid valve E ₁ is opened, the compressed air supply source 13
Compressed air supplied from the main supply pipe 14 to the color change valve V ₁ via the control air supply pipe P ₁ opens the color change valve V ₁ . Therefore, the white paint is discharged from the coating machine 5 and the article W is painted white.

Next, the solenoid valve E is attached to the remote switch 16.
_When the signal for closing ₁ is supplied, the power supplied from the remote switch 16 to the solenoid valve E ₁ is shut off and the solenoid valve E ₁ is closed, so that the color change is performed via the control air supply pipe P _1. The air supplied to the valve V ₁ is also shut off,
The color change valve V ₁ is closed.

When the red paint supplied from the color changing valve V ₂ is used for coating, the cleaning air valve Va and the cleaning solvent valve Vt are alternately opened to remove the paint remaining in the color changing device 6 and the coating machine 5. After washing, the color change valve V ₂ is opened and painted with red paint. In this way, the compressed air supplied from the single main supply pipe 14 is supplied to each of the control air supply pipes P ₁ to P ₁ .
Since it is branched into Pn, Pt, and Pa, the piping is extremely simple and the entire coating apparatus can be downsized.

In the above embodiment, the positive pressure explosion-proof box 18 includes the branch portion of the main supply pipe 14 and the solenoid valves E _{1 to} E.
The case where it is formed so as to cover the n, Et, Ea, and the remote switch 16 has been described, but as shown in FIG.
The main supply pipe 14 is connected to the box 18 itself, a control air supply pipe connection port 20 is formed in the box bottom portion 18a, and each solenoid valve solenoid valve E ₁ to
En, Et, and Ea may be arranged. Further, the present invention is not limited to the case of being applied to a top machine, but can also be applied to a so-called side machine in which coating is performed while vertically reciprocating the coating machine along the side surface of the object to be coated. Further, the remote switch 16 is connected to each solenoid valve E _{1 to} En, E.
Although the case where the remote switch 16 is arranged in the positive pressure explosion-proof box 18 together with t and Ea has been described, the remote switch 16 is arranged on a control panel or the like installed apart from the automatic coating apparatus 1 and the electromagnetic switch is installed from the control panel. You may connect an electric wire according to the number of valves. In this case, the number of electric wires is increased, but the wiring is extremely simple compared to connecting an air hose.

[0018]

As described above, according to the present invention, compressed air for performing the on / off operation of the color changing valve can be supplied from the air supply source to the vicinity of the color changing device through one main supply pipe. As a result, the piping process can be performed extremely easily, and at the same time, there is no need to secure a piping space, and the entire coating apparatus can be miniaturized, which is a very excellent effect. In addition, a control air supply pipe that performs on / off operation of each color change valve is branched from the main supply pipe and is connected to the color change valve via a solenoid valve. Since the switch is housed in a positive pressure explosion-proof box, it has the effect of being legally safe and having excellent safety.
Furthermore, the positive pressure explosion-proof box does not have to be so sturdy, can be formed to be small and lightweight, and since an opening such as a lid can be provided, maintenance can be performed easily.

[Brief description of drawings]

FIG. 1 is a flow sheet showing a main part of an automatic coating device according to the present invention.

FIG. 2 is a front view showing the whole thereof.

FIG. 3 is a flow sheet showing a main part of another embodiment.

[Explanation of symbols]

1 ・ ・ Automatic coating device W ・ ・ ・ ・ ・ ・ ・ ・ Coating object 2 ・ ・ ・ ・ ・ ・ Conveyor 3 ・ ・ ・ ・ ・ ・ Elevating platform (elevating body) 5 ・ ・ ・ ・ ・ ・ Coating machine 6 ・ ・ Color changing device V _{1 to} Vn ・ ・ Color changing valve Vt ・ ・ ・ Washing solvent valve Va ・ ・ ・ Washing air valve P _{1 to} Pn, Pt, Pa ・ ・ Control air supply pipe E ₁ ~ En, Et, Ea ··· Solenoid valve 15 ··· Power cable 16 ··· Remote switch 17 ··· Signal line 18 ··· Positive pressure explosion-proof box

Claims (1)

[Claims] 1. A color change valve (V ₁ ) for selectively selecting each color paint supplied from a paint supply source and supplying it to a coating machine (5).
Color change device having a to Vn) (6) is, in the automatic coating apparatus which is mounted on the vertically movable body for vertically supporting the sprayer (5) (3), wherein each of color change valve (V ₁ to Vn) Control air supply pipe (P _{1 to} Pn) that supplies control air to turn on and off
But the color change valve main supply pipe from (14) supplying compressed air (V ₁ to Vn) as many branches to solenoid valve (E ₁ ~En) through each color change valve (V ₁ to Vn) The electromagnetic valves (E _{1 to} En) that are connected to each other are housed in a positive pressure explosion-proof box (18) maintained at a pressure higher than the outside and disposed on the lifting body (3). Automatic coating equipment.