JPS5952570A - Coating method - Google Patents

Abstract

PURPOSE:To make the thickness of a coating film uniform, while making a coating process automated, by sucking paint mist sprayed through a nozzle inserted into one opening of a tubular member by a evacuative suction means attached to the other opening. CONSTITUTION:In coating the inner surface of a sill as a part of an automobile body, when said body comes in a state stationarily supported with a lifter, a nozzle 7 is automatically inserted through an air cylinder into the vicinity of the opening of the sill 3 at its one opened end 3a, and a suction cup 10 is closely attached to the other opened end 3b. Thereafter, air and paint are individually supplied to a spray gun 8 and atomized in a mixed state through the nozzle 7, so that paint mist having permeated the interior of the sill 3 is sucked at the side of the suction cup 10 communicating to a cyclone 12. At this time, paint particles adhere onto the entire inner surface of the sill 3. Said sucked paint mist is separated from air and recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating method for forming a uniform and necessary thickness on the inner surface of a member forming a tubular structure.

Conventional methods for painting the inner surface of members that form a tubular structure include:
For example, there are those shown in FIGS. 1 to 3.

H (4 In Figure 1, it is a car body that has been moved to a processing position by a conveyor not shown in the figure, and is supported in a fixed position by a lifter 2. 3Fi is a part of the body l) The sill 4 is a reinforcing portion, and forms a tubular structure with a cross section as shown in FIG. 2, which is the II-11 curved surface of FIG. 1.

The □ member 5' shown in FIG. 3 includes the sill 3 and the reinforcing member 4.
' etc. are simplified for ease of explanation, and in reality, they are often irregularly curved in the longitudinal direction as well. Reference numeral 6 designates a nozzle pipe inserted from the opening 5a of the portion 445, which has a nozzle 7 at its tip for spraying paint, and is attached to a spray gun 8. 8a is air (compressed nitrogen, same below)
The blowing port 8b is a paint supply port.

Now, in order to paint the inner surface of the member 5, first insert the nozzle 7 of the nozzle pipe 6 from one opening 5a of the member 5 to the vicinity of the other opening 5b, and then use the spray gun 8.
The nozzle pipe 6 is pulled back in the direction of the arrow while a mixture of paint and air is sprayed from the nozzles 1 to 11 through the nozzle '16. Then, particles of the paint cyst filled in the member 5 adhere to the inner surface of the member 5 and are painted.

However, with such conventional painting methods,
In order to insert the nozzle pipe 6 into the inside of the member 5, the operator must manually insert the nozzle pipe 6, and when the member is complicatedly curved, it is necessary to There was a problem in that this internal painting process could not be automated.

The present invention was made by focusing on such conventional problems, and a nozzle is inserted into one opening of a tubular member, a vacuum suction device 8 is attached to the other opening, and a jet is emitted from the nozzle. The applied paint mist is sucked up by the vacuum suction device! The purpose of the present invention is to solve the above-mentioned problems by using a coating method of f″f17.

The present invention will be explained below based on the drawings.

2n l *4 FIG. 2 is a diagram showing an embodiment of the present invention. It should be noted that the tit is the same as the conventional example.
The explanation of adding the symbol iIl- and repeating it will be omitted.

First, to explain the configuration, lO is the other opening 5 of the member 5.
A suction cup made of an elastic abrasive material such as rubber so as to be in close contact with b, is connected to a cyclone 12 which is a paint recovery device via a suction pipe 11. P+瘉: Pump for discharging the air in the I cyclone 12, l'+r pump for circulating the collected paint to the paint tank 13, P3 pumps the paint 1 in the paint tank 13 to the spray gun 8 This is a pump for supplying

Also, in Figure 2131, 14t: t'7 noklever 1
Nozzle 1 attached to spray gaff 8 through i
An air cylinder 160 operates so as to be inserted into one opening end 8a of the sill 3 corresponding to section 4'' 5, and similarly the suction cup 10 No. 611 is inserted into the other opening i1A of the sill 3.
31) is an air cylinder that operates as if in close contact with the air cylinder.

In addition, the suction cup 10. Suction tube' I 1, pump P
Vacuum suction capacity 1 by cyclone 12 with 1fii
It consists of 19.

Next, the effect will be explained.

As already shown in the conventional example, when the body 1 is supported by the lifter 2, the air cylinder 1
4.16 is inserted into the opening end 3a of the sill 3 automatically when the nozzle 1/ri is inserted into the vicinity of the opening end 3a of the sill 3, and the suction cup 10Irj is inserted into the vicinity of the opening end 3a of the sill 3.
E) is secretly painted.

Next, spray gun 8. Air is blown into the tank [18a], and when the paint is supplied from the paint tank 13 and mixed with the paint and sprayed from the nozzle 7, it has already been exhausted by the pump P and becomes negative pressure. As a result of the cyclone 12, the paint mist that has filled up in the tank 5 or sill 3 is sucked from the cup 10.

In this way, the paint that was sprayed from nozzle 1 was mistaken.

While the paint fills the sill 3 and flows toward the other open end 3hK, the paint A'I adheres to the entire inside of the sill 3.

On the other hand, the paint mist sucked by the suction cup 10 is centrifuged outside by the cyclone 12, the air is discharged by the pump P1, and the paint is stored in the lower part of the cyclone 12 and pumped to the paint tank 13. It is designed to be refluxed by P2.

In this example, 1: Rust-preventing wax is used, but 1 is not necessarily applicable to other solvent-based paints, water-based paints, etc. in the same manner.

Furthermore, the coating method according to the present invention can also be applied when powder coating is performed using an electrostatic coating spray gun in place of the spray gun 8 of this embodiment.

As explained above and achieved, according to the present invention, in a method for painting the inner surface of a tubular structure, a nozzle is inserted into one opening of the member, and the other opening is opened. [Since the coating method is characterized in that a vacuum suction device 6 is attached to one part and the paint mist ejected from the nozzle is sucked by the vacuum suction device, the inner surface coating process of the tubular structural member is automated. I made it, it was a waste!
This method provides many benefits, such as being able to uniformly coat the p-film with a safe minimum thickness and increasing the recovery rate of excess paint.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an example of a member to be painted, Fig. 2 is a sectional view of Fig. Regarding the light, I! Example 41;'
It is a perspective view of tl$i. +3 s 4 e 5...11~ , l
/13 a, 5 a...... One open [
"Part 3 h, 51) Old...Other opening D f
ltl・・・・・・・・・Group・・・・・・River Nozzle 1st
Figure 2

Claims (1)

[Claims] In a method for painting the inner surface of a member forming a tubular structure, a nozzle is inserted into one opening of the member, a reduced pressure suction device is attached to the other opening, and the paint mist sprayed from the nozzle is applied to the reduced pressure. A painting method characterized by suction using a suction device.