JPH0910638A - Automatic coating equipment - Google Patents

Abstract

(57) [Summary] [Purpose] A paint that did not adhere to the article to be painted by preventing the need for a skilled worker and preventing the contamination of the surrounding work area by painting in a space completely shielded from the outside. (EN) An automatic coating device capable of eliminating the labor of cleaning and maintenance of the device and the waste of paint by automatically collecting and reusing the product and obtaining a product of uniform coating quality. [Structure] A space surrounded by the trays 2, 9 and the rotary hood 6 and the top plate 7 constitutes a coating chamber 30, and in the coating chamber 30, a rotary table 1 on which an article G to be coated is placed, and an article to be coated An injection nozzle 4 for injecting paint is provided on G, the inner surface of the rotary hood 6 is covered with a non-adhesive material layer such as polyethylene resin, and the movable portion 9 of the tray and the rotary table 1 are lowered by the motor 12 to produce the article G. Can be replaced. The recovered paint is readjusted by the paint circulating unit 13 and supplied again from the supply pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic coating device.

[0002]

2. Description of the Related Art Heretofore, electrostatic coating has been known in which paint particles are attached to the surface of an article to be coated by utilizing a phenomenon of electrostatic attraction, but this method cannot be applied to a coating having a low electrostatic chargeability. .

Further, in the case of manual work in which the operator holds the spray gun by hand, the quality of the coated article varies depending on the skill of the operator, and a shield plate for preventing the scattering of paint particles is provided, and an exhaust system is provided. Even if it is provided, the work environment is polluted, the health of the worker is impaired, the paint adhered to the shield plate and the exhaust equipment is wasted, and further, the cleaning and removal of the adhered paint requires a large cost. There are drawbacks.

[0004]

SUMMARY OF THE INVENTION The present invention eliminates the need for a skilled worker by automating the process, and prevents the contamination of an adjacent work place by coating in a space completely shielded from the outside. By automatically collecting and reusing the paint that did not adhere to the article to be coated, it is possible to eliminate the labor of cleaning the equipment and waste of the paint, and to obtain a product with uniform coating quality with high efficiency. , Provides a new automatic coating device.

[0005]

SUMMARY OF THE INVENTION An automatic coating apparatus according to the present invention comprises a table on which an article to be coated is placed, a paint injection nozzle disposed above the table, and the upper and lateral sides of the nozzle. A substantially conical hood with a non-adhesive material provided on the inner surface to block it, a paint tray provided under the table to form a coating chamber in cooperation with the hood, and the table and the nozzle relative to each other. First rotating means for rotating the hood, second rotating means for rotating the hood, opening / closing means for relatively separating the table and the hood, and paint for circulating the paint in the paint tray to the nozzle. It is characterized by having a circulation part.

Further, the automatic coating apparatus of the present invention comprises a coating step of spraying the coating material from the coating material spray nozzle while rotating the table on which the article to be coated is placed by the first rotating means,
The paint and the solvent on the paint receiving pan that closes the lower edge opening surface of the hood while injecting the solvent from the top of the hood by rotating the substantially conical hood having the non-adhesive material on the inner surface by the second rotating means. It is characterized by having a program for automatically executing a paint collecting process for collecting the paint through a paint collecting pipe.

[0007]

The article to be coated is rotated together with the table by the first rotating means, and the atomized paint is evenly attached to the surface of the article to be coated from the spray nozzle. This mist-like paint floats in the space surrounded by the saucer and the hood, and there is no risk of leaking to the outside. Since the hood is rotated by the second rotating means and the non-adhesive material is provided on the inner surface of the hood, the paint adhered to the inner surface moves to the lower edge of the conical shape by centrifugal force and gravity and is collected on the saucer. . The paint collected in the pan is re-adjusted in composition and concentration by the paint circulating means, and then sent to the injection nozzle for reuse. When the coating process for a predetermined time is completed, for example, the tray and the table are lowered by the opening / closing means, so that the painted article is taken out and replaced by the article to be coated, and the opening / closing means operates in reverse to block the bottom edge of the hood. The same coating process is repeated.

[0008]

FIG. 1 shows an embodiment of the present invention. Article to be coated G
Is, for example, a parts storage container of a parts feeder,
It has a short cylindrical shape with a diameter of several tens of centimeters, and in particular, a smooth coating is required on the inner surface. Turntable 1
Is to rotate the article G to be coated, which is supported by a ball bearing provided in the center of the tray 2 and is rotationally driven by a first motor 3 with a reduction gear provided below the tray 2. Above the turntable 1, there is provided a nozzle 4 for spraying the paint in the form of fog droplets at a wide angle.
A cylinder 5 through which the paint supply pipe and the compressed air supply pipe pass is suspended from above to support the nozzle 4. The rotary hood 6 that forms the coating chamber 30 together with the tray 2 is a substantially conical hood whose lower edge is slidably supported by the outer periphery of the tray 2 and whose top is rotatably supported by the top plate 7. The top of the hood 6 is engaged with the second motor 8 with a reducer, and the inner surface of the hood 6 is covered with a coating of polyethylene resin, a fluorine resin, or the like, or a non-adhesive coating such as a thin plate of aluminum or stainless steel. A central portion of the tray 2, at least a portion 9 larger than the turntable 1 is supported by a pantograph mechanism 10 so as to be able to move up and down, and can be driven up and down by a rack and pinion mechanism 11 and a third motor 12 with a reduction gear. it can. Further, the height of the injection nozzle 4 can be automatically adjusted by the fourth motor 28.

The paint circulation section 13 has a paint supply pipe 14 for supplying the adjusted paint to the injection nozzle 4, a paint recovery pipe 15 for recovering the paint and the like not adhered to the article from the tray 2, and adheres to the article. The container 16 containing the main paint, the container 17 containing the curing agent, the container 18 containing the solvent, the mixing section 19 for mixing these, and the mixed and adjusted paint are supplied to replenish the consumed amount. A pump 20 for sending out to the pipe 14 and electromagnetic valves 21 and 22 are provided.

Further, in order to clean the inner surface of the rotary hood 6, there is provided a solvent supply pipe 24 for directly supplying the solvent to the nozzle 23 at the top of the rotary hood 6 through the control valve 22. Further, the containers 16, 17 and 18 are provided with a compressed air introduction pipe for sending out the stored items and opening / closing valves 25, 26 and 27 for controlling the compressed air introduction pipe. Furthermore, in order to completely discharge the residual paint at the end of painting and when changing colors,
A paint discharge pipe 32 and a valve 31 are provided.

FIG. 2 shows a block diagram of the process control system of the above embodiment. The process control unit 28 automatically controls the on / off control of the first motor 3, the second motor 8, the third motor 12, and the fourth motor 28, and the opening / closing control of various control valves. The process control unit 28 is a microcomputer including an electronic timepiece, a keyboard 29 for inputting programs written in a ROM, various set values and commands,
The output is output via the interface 30 to the first motor 3, the second motor 8, the third motor 12, the fourth motor 28, the solenoid valves 21 and 22, the pump 20, the solenoid valves 25 and 2.
Controls various controlled objects such as 6, 27.

FIG. 3 shows a flowchart of a program written in the process control unit 28. As the condition setting work before entering the coating process, the size (diameter, height, etc.) of the article to be coated G, the coating thickness, the rotation speed of the turntable 1, etc. are set from the keyboard. When the start button is pressed, the third motor is driven in step 1 and the central portions of the turntable 1 and the tray 2 are lowered to the lowest position,
The article G to be coated is placed on the turntable. After a predetermined time, the third motor is reversely driven to raise the turntable 1 and the tray 2, and the coating chamber 30 is sealed. Next, in step 2, the turntable 1 is rotated, the main coating material and the curing agent are mixed in a predetermined ratio and supplied to the spray nozzle 4, and coating is performed while the spray nozzle 4 moves up and down according to set conditions. The injection nozzle 4 may be stationary. When the predetermined time has passed, the spray of paint is stopped,
Turntable rotation stops. Next, returning to step 1, the center parts of the turntable 1 and the tray 2 are lowered, the coated article is taken out, a new article to be coated is placed, and the above-mentioned coating step is repeated. Each time a predetermined number of coatings are completed, the process proceeds to the paint recovery process of step 3, where the turntable 1 is empty and the coating chamber is sealed, and the rotary hood 6 is rotated while the solvent is supplied to the rotary hood 6.
The inner surface of the tray 2 and the tray 2 are cleaned, and collected with the solvent from the paint collecting pipe 15 for reuse.

When all the work is finished or when the color of the paint is changed, the cleaning process of step 4 proceeds, the valve is opened to discharge the residual paint, and the valve 22 is opened to supply the solvent to the entire coating system circuit to remain. The paint is washed and the washing liquid is drained 3
It is discharged from 2. After the cleaning is finished, the valve is closed.

The turntable 1 and rotary hood 6 of the present invention
The opening / closing means for relatively separating the can also be implemented by an air cylinder or a hydraulic cylinder.
It can also be carried out manually by a lever mechanism or the like. Similarly, the means for raising and lowering the support pipe 5 of the injection nozzle 4 can also be implemented by an air cylinder, a solenoid type electromagnetic actuator, or the like.

[0015]

EFFECTS OF THE INVENTION According to the present invention, the sprayed paint is sprayed from the nozzle in the coating room which is shielded from the outside world, so that the paint is not scattered to the surroundings and the working environment in the factory is improved. This keeps workers free from the health hazards of paint stains and solvent inhalation.

Further, since the paint that has not adhered to the article to be coated is collected and supplied for reuse, waste of the paint is eliminated, and at the same time, a paint collecting process in the painting chamber for collecting and a cleaning process such as color change. However, it eliminates the need for workers to clean the coating equipment.

Further, since the article to be coated is rotated at a set rotational speed for a predetermined time, the positional relationship between the injection nozzle and the article to be coated and the distance are automatically controlled according to the set conditions.
It eliminates the need for skilled workers and makes the coating quality uniform.

[Brief description of the drawings]

FIG. 1 is a diagram showing a mechanical configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control system according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a control program according to the embodiment of the present invention.

[Explanation of symbols]

 1 ... Turntable 2 ... Receiving tray 3 ... 1st motor 4 ... Injection nozzle 6 ... Rotating hood 7 ... Top plate 8 ... 2nd Motor 9 ・ ・ ・ ・ Movable part of pan 10 ・ ・ ・ ・ ・ ・ Pantograph mechanism 11 ・ ・ ・ ・ Rack and pinion mechanism 12 ・ ・ ・ ・ ・ ・ Third motor 13 ・ ・ ・ ・ ・ ・ Paint circulation part 14 ・ ・ ・ ・ ・ ・ Paint supply Pipe 15 ··· Paint recovery pipe 28 ··· Process control unit 30 ··· Painting room

Claims (2)

[Claims] 1. A table on which an article to be coated is placed, a paint spray nozzle arranged above the table, and a non-adhesive material provided on the inner surface for blocking the upper and lateral sides of the nozzle from the outside. A substantially conical hood, a paint pan provided under the table to cooperate with the hood to form a coating chamber, first rotating means for relatively rotating the table and the nozzle, An automatic coating device having a second rotating means for rotating a hood, an opening / closing means for relatively separating the table and the hood from each other, and a paint circulating portion for circulating the paint in the paint tray to the nozzle. 2. A paint process of spraying paint from a paint spraying nozzle while rotating the table on which the article to be coated is placed by the first rotating means, and a substantially conical hood having a non-adhesive agent on its inner surface. A paint collecting step of collecting the paint and the solvent on the paint receiving pan, which is rotated by the second rotating means and blocks the lower edge opening surface of the hood while injecting the solvent from the top of the hood, through the paint collecting pipe, automatically. An automatic painting machine with a program to run.