JPH0121012Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a bell-type rotary atomizing coating machine. More specifically, the present invention relates to a bell-shaped rotary atomizing coating machine (hereinafter referred to as a bell-shaped coating machine) configured to prevent the occurrence of colored spots.

[Prior Art] Bell-type atomizers, which atomize paint using a bell cup that rotates at high speed, have been widely used for painting automobile bodies and the like.

The bell-shaped paint sprayer is equipped with a cleaning device that sprays cleaning thinner from a cleaning nozzle to wash off the paint that adheres to the bell cup before the color change. During the painting process, this prevents paint from being sprayed together with the paint before the color change.

[Problems that the invention aims to solve] However, when using a conventional bell-type paint sprayer, it still causes colored spots due to poor cleaning (uncured paint and hardened paint pieces adhere to the coated surface in spots). (condition) may occur.

The cause of this is that the cleaning fluid containing the paint that was scattered when cleaning the bell cup adhered to the cylindrical flange that prevents the cleaning fluid from scattering, and then dripped into the air hole of the shaping air ring, leaving the paint in a half-dried state. This is thought to be due to the fact that when air is blown out from the air hole during painting after replacement, it is also sprayed with the air.

In view of the above-mentioned circumstances, an object of the present invention is to provide a bell-shaped paint machine that prevents paint from adhering to the surface of the shaping air ring when cleaning the bell cup.

[Means for Solving the Problems] The bell-shaped atomizer of the present invention has a shaping air ring attached to the rear of the bell cup, a cleaning nozzle for the bell cup attached to the shroud base, and an inner periphery of the shroud base. In a bell-shaped rotary atomizing paint sprayer having a cylindrical flange for preventing the cleaning liquid from scattering, the air nozzle is configured to blow air along the inner periphery of the cylindrical flange at a position below the cleaning nozzle. A characteristic feature of the structure is that

[Function] In the bell-shaped atomizer of the present invention, a curtain (hereinafter referred to as an air curtain) is formed by compressed air blown from an air nozzle along the inner circumference of a cylindrical flange for preventing scattering of cleaning liquid. Therefore, even if the cleaning liquid containing paint tries to scatter onto the inner circumferential surface of the cylindrical flange when cleaning the bell cup, the air curtain prevents the cleaning liquid from spraying onto the inner peripheral surface of the cylindrical flange. Furthermore, even if the paint adheres to the inner circumferential surface of the cylindrical flange, it will be blown off by the air curtain as it drips down from there, and as a result, the paint before color change will not remain on the surface of the shaping air ring. .

[Example] Next, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional side view of a main part of a bell-type atomizer according to an embodiment of the present invention, and shows the state during cleaning.

The bell-shaped atomizer shown in FIG. 1 is used as a side gun for painting automobile bodies.
1 is a bell cup, and 2 is a shaping air ring placed behind it. bell cup 1
is equipped with a rotating disk inside, which rotates at high speed to atomize and spray the paint supplied from the paint supply nozzle. The shaping air ring 2 is provided with a large number of air holes 3.
Compressed air is blown out from there to form a conical air curtain, thereby regulating the paint spray pattern. 4
is a shroud body, the base of which is attached to the outer periphery of the shroud base 5. Further, a cylindrical flange 6 is attached to the inner circumference of the shroud base 5. A cleaning nozzle 7 is attached to the shroud base 5 above the bell cup 1 between the shroud body 4 and the cylindrical flange 6.

In the cleaning state shown by the solid line, the cleaning nozzle 7 has its tip directed toward the inner surface of the bell cup 1, and by spraying cleaning thinner from there, the cleaning nozzle 7 cleans the bell cup 1 before changing the color. I try to wash off the paint. The cylindrical flange 6 serves to prevent the cleaning liquid containing paint from scattering onto the shroud base 5 in the above-mentioned cleaning state.

An air nozzle 8 is installed below the cleaning nozzle 7 and along the inner circumference of the cylindrical flange 6. When compressed air is blown forward from this air nozzle 8, the bell cup 1
An air curtain is formed between the inner peripheral surface of the cylindrical flange 6 and the inner peripheral surface of the cylindrical flange 6.

Note that during the painting work, the shroud body 4 and the like are retreated to the rear of the bell cup 1, as shown by chain lines.

In the bell-shaped paint sprayer with the above configuration, when cleaning thinner is sprayed from the cleaning nozzle 7 onto the inner surface of the bell cup 1, the cleaning liquid containing the washed-off paint bounces off the surface of the bell cup 1, and the cylindrical flange It also tries to scatter on the inner surface of 6. However, the cleaning liquid does not adhere to the inner surface of the cylindrical flange 6 because it is blown away forward by the air curtain injected from the air nozzle 8 before it adheres to the inner surface of the cylindrical flange 6. Further, even if it adheres, the air curtain prevents it from dripping from the surface of the cylindrical flange 6.

In this way, the shaping air ring 2
The cleaning solution containing paint is prevented from adhering to the surface of the

The paint that has been washed away with the cleaning liquid is discharged from the discharge port 9 provided at the bottom of the shroud body 4.

[Effects of the invention] The bell-shaped paint sprayer of the present invention prevents the cleaning liquid containing paint from adhering to the surface of the shaping air ring when cleaning the bell cup, so the paint before color change is not sprayed along with it. The generation of colored spots is effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a main part of a bell-shaped atomizer according to an embodiment of the present invention during cleaning operation. Main symbols in the drawings: 1... Bell cup, 2... Air ring for shaping, 4... Shroud body, 5... Shroud base, 6... Cylindrical ring, 7... Cleaning nozzle, 8... Air nozzle.

Claims (1)

[Scope of utility model registration request] A bell-shaped rotating mist having a shaping air ring attached to the rear of the bell cup, a cleaning nozzle for the bell cup attached to the shroud base, and a cylindrical flange attached to the inner circumference of the shroud base to prevent cleaning liquid from scattering. 1. A bell-type rotary atomizing atomizer, characterized in that an air nozzle is arranged below the cleaning nozzle to blow out air along the inner periphery of the cylindrical flange.