JPS6349270A - Color changing and cleaning device for mini-bell type coater - Google Patents

Abstract

PURPOSE:To obviate the generation of painting defects such as color blobs and thinner splashes during painting work by executing cleaning while ejecting air from air ejection holes of an air ejector at the time of color changing and cleaning after the painting work. CONSTITUTION:The air ejector 20 which is larger in diameter than a bell cup 5 of a mini-bell type coater and has the plural air ejection holes 21 on the bell cup side surface is mounted to the rear part of the bell cup 5 and an air source is connected to said air ejector 20. More specifically, the cleaning is executed while the air is ejected from the air ejection holes of the air ejector at the time of color changing and cleaning after the painting work, by which the cleaning thinner and cleaning air are guided in the fixed direction without being splashed to the outside. The generation of the painting defects such as color blobs and thinner splashes during the painting work is, therefore, obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a color change cleaning device for a mini-bell type paint sprayer, which has an improved mechanism for preventing scattering of cleaning air and cleaning 7-na during color change cleaning. It is.

(Prior Art) A minibell type paint sprayer requires a mechanism to prevent cleaning air and cleaning thinner from scattering during color change cleaning.

A conventional mini-bell type coating machine equipped with this mechanism will be explained with reference to FIG. 4. 1 is a top machine, and 2 is an insulated support section. The insulation support part 2 is suspended from the top machine 1 by a mounting part 3.

An air motor 4 and a bell cup 5 are attached to the insulated support part 2, and a shroud 6 is provided on the outer periphery of the bell cup 5 so as to be movable up and down.

7.8d Manifold exit: Trigger dump pulp 9 is attached to manifold 7, color pulp 10.11 of different colors A and B, cleaning air pulp 12 and cleaning thinner bulb 13 are attached to manifold 8. . 14. 15 is the hose, 16 is the feed tube.
Ru. A thinner reservoir 17 is provided in the lower part of the sheroud 6, and this thinner reservoir 17 is communicated with a drain tank (not shown) via an ejector tube 18 and a hose 19.

In the conventional mini-bell type paint sprayer with such a configuration, when the painting work is finished and the color change cleaning is to be performed, the shracto 6 is first lowered to the position shown in the figure (it is raised during the painting work), and the bell cup 5 is lowered. It will be covered. In this state, the cleaning air valve 12 and the cleaning thinner valve 13 are opened alternately, and the trigger dump valve 9 is kept open. Then, the cleaning air and cleaning thinner alternately pass through the hoses f4, 15 and the feed tube 16, reach the bell cup 5 which is being rotated for cleaning, and are jetted radially from the bell cup 5 to the inside of the sheroud 6.

By flowing the cleaning air and cleaning thinner in this manner, the yarn path is cleaned. The cleaning air and cleaning thinner ejected radially from the bell cup 5 collide with the inner wall of the shroud 6, the cleaning air escapes upward, and the cleaning thinner accumulates in the thinner reservoir 17, after which it is sucked out from the ejector tube 18 by an ejector (not shown). The liquid is then sent through the hose 19 to a drainage tank (not shown). When cleaning is completed, the sheroud 6 is retreated to the rear of the bell cup 5.

(Problem to be solved by the invention) The conventional device as described above has the following problems.

In other words, ■ During cleaning, the shroud is moved forward and the bell cup is covered for cleaning, so the inner surface of the shroud becomes dirty and thinner adhering substances are attracted by the electrostatic force during painting and adhere to the object to be coated, causing discoloration and stains. Paint defects due to thinner removal occur.

■ Cleaning air and cleaning thinner are ejected radially onto the inner surface of the shroud, so the cleaning air and cleaning thinner that collide with the inner surface of the shroud and scatter adhere to the shaping air ring at the rear of the bell cup, the air motor body, the collar valve, etc.

■Similarly, when painting, it adheres to the object being painted due to the force of static electricity,
This will cause paint defects such as color spots and thinner splatters.

■ When installed on a top reciprocating machine, if the drained liquid thinner accumulated in the thinner reservoir of the shroud is not sufficiently suctioned, thinner will drop during reciprocating operation.

■ When using a Minibell sprayer to paint by following the shape of the object being coated, the sherroud, which is similar to the Minibell sprayer, must also be tilted. Due to dirt on the shroud and the inner surface of the shroud, ■Similarly, paint defects such as color spots and thinner removal occur during painting.The present invention eliminates the use of a shroud and uses a structure that replaces it. The above conventional technology has ■
This solution solves all of the problems.

(Means for Solving the Problems) The present invention, as a means for solving the above problems, provides a mini-bell type atomizer with a plurality of holes on the rear side of the bell cup, which have a diameter larger than that of the bell cup and on the surface on the bell cup side. An air blowing device having an air blowing hole is attached, and an air source is connected to the air blowing device.

(Function) With this configuration, when changing colors and cleaning after painting work,
By performing cleaning while blowing out air from the air blowing hole of the air blowing device, the cleaning thinner and cleaning air are not scattered outside the blowing air, but are guided in a fixed direction, so there are no problems like with conventional ones. This will not occur at all.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIG. 1, with the same members as in FIG. , is a circular container with a larger diameter than the bell cup 5, and is attached to the upper part of the bell cup 5. A plurality of air blowing holes (small holes) 21 are provided on the surface (lower surface) of the air blowing device 20 on the side of the bell cup 5 (see FIG. 2), and an air hose 2
Air is supplied from an air source (not shown) through the air outlet 20 and enters the air chamber 23, and is ejected downward from the air outlet 21. 7) An inner flQK shaving bit chamber 24 is provided, and a shaving air ejection hole 25 is provided on the lower surface (see FIG. 2) to form a shaping air ejection device 26.

27 is a hose that sends air to the shaping air chamber 24, 28 and 29 are hoses that supply paint to the color pulp 10 and 11, respectively, 50 is a cleaning air hose, and 31 is a cleaning thinner hose. For the octopus equipment, color change cleaning after painting work is done with Color Pulp 10.11 stopped.
The cleaning air pulp 12 and the cleaning thinner valve 13 are opened alternately to send air to the bell cup 5, from where it is ejected to the outside to clean the yarn path. At this time, when air is supplied from an air source (not shown) through the air hose 22 and the air is jetted downward from the air outlet 21 through the air chamber 23, the jetted air flows into a bell as shown at 32. Since it descends while surrounding the outer periphery of the cup 5, the shielding effect of the jetted air 32 prevents the cleaning air and cleaning thinner from scattering to the outside.

FIG. 5 shows the pattern width ( L)'! - It is plotted in relation to the peripheral air pressure. From this figure, the peripheral air pressure (blowout air 3
It can be seen that if the pressure (2) is increased, the pattern width becomes smaller.

Practically speaking, the pressure is preferably 5 ky/ad or more.

(Effects of the Invention) As explained above, the present invention uses the air blowing device according to the present invention in place of the conventionally used shroud. Everything will be resolved. Furthermore, the area around the bell cup can be cleaned up, and the distance between the feed tube and the trigger pulp can be shortened, so that the color change time can be shortened. In addition, even when the Minibell paint sprayer is tilted, there is no seal lactate, so there is no thinner falling or flying, and no paint defects occur. Furthermore, maintenance and inspection of shracto, which was necessary in the past and was rare, is no longer necessary, so the number of man-hours can be greatly reduced. There are advantages such as

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view of the main part of an embodiment of the present invention, Fig. 2 is a bottom view of the air blowing device in Fig. 1 seen from below, and Fig. The operation of the picture! ! ! The f-characteristic graph is a partial cross-sectional view of a conventional device. 5... Bell cup 20... Air blowing device 21
... Air outlet patent applicant Toyota Motor Corporation Trinity Industries Co., Ltd. (11 force 126) Figure 1 Figure 3 Outer air ff T) (kg/crn2) Figure 4

Claims (1)

[Claims] (1) At the rear of the bell cup in a mini-bell type paint sprayer,
A color change cleaning device for a mini-bell type paint sprayer, characterized in that an air blowing device having a diameter larger than the bell cup and having a plurality of air blowing holes is attached to the surface on the bell cup side, and an air source is connected to the air blowing device. .