JPS63166454A - Rotary atomizing electrostatic painting apparatus - Google Patents

Abstract

PURPOSE:To wash a spray head over the entire area thereof, by providing a washing thinner jet nozzle capable of injecting a washing thinner toward the arbitrary area of the inner surface of the cup-shaped spray head. CONSTITUTION:When painting is finished, the number of rotations of a cup- shaped spray head 26 is lowered to the number of rotations for washing and, at the same time, air is injected from the inside and outside chambers of the housing 27 of an air injector 25. The air from the outside chamber having an outer diameter larger than that of the spray head 26 flows as the outer peripheral air of the spray head 26 as shown by an arrow D. In this state, a washing thinner jet nozzle 43 is set in a predetermined direction with respect to the inner surface of the spray head 26 through a piston rod 39a to start washing. By this constitution, the area to which paint particles are adhered on the central part of a usual cup-shaped spray head 3 other than the inner peripheral surface thereof can be perfectly and automatically washed with the washing thinner and washing air from the washing thinner jet nozzle 43.

Description

[Detailed description of the invention] (Field of use of Yutojo) The present uA relates to an electronic device.

(Prior Art) A rotary electrostatic pulsating device, known as a m-loading device for fixing a vehicle body, supplies violet by applying a negative voltage to a cup-lowering jet that rotates once. Particularly, the charge on jiL' is loaded by ejecting it onto the am object in which the value grains calculated by Teiden are inserted.

By the way, when cleaning with such a device, the paint scatters from the cup-shaped spray tin head, so spraying @OR8 is performed using a Sierra Loud (for example, Fi Utility Model Publication No. 57-90745) , Utsukai Showa 40-11236
No. 4 Publication No. 61-104!42).

However, when using Sierra Loud in this way, there are some disadvantages, so Sierra Loud should not be used.
It has already been proposed to prevent paint scattering by blowing air around C% open 58-1044.
Publication No. 34 λ This woodcutter's device t - Explained using Figure 4 0 An air motor 2 and a cup-shaped nozzle head 3 are attached to an injected support $ 1 attached to a top machine (not shown). Further, an air jet 1fIA4 is attached to the rear of the jet head 5, that is, above the jet head 5. The air-fi spout 4 has inner and outer air chambers, and air hoses 5.6 are connected to each chamber and introduced! Qi is blown out from the bottom of each chamber. 7 stile manifold, and BK has 8 cleaning sinker pulps and 8 cleaning air pulps! However, a pair of color pulps 10 and 11 are interposed in the lower part, and a hose 12 is connected to the lower part of the manifold 7, and a trigger plate ν (pulp 1s is interposed in the lower part of the manifold 7). Yes. Hose 12
The lower end S of is connected to a feed chain 14 connected to a cup-shaped spray @S.

Next, the effect of the above i&direct will be described. *When loading is finished and 1 cleaning starts, tf! ! Air is ejected from the inner and outer shaft chambers of the air ejector 4, and the washing sinker pulp 8 and the washing air pulp 9 are opened alternately, and the sinker or Fi air passes through the hose 12, the trigger damper pulp 13, and the tweed chain 14. It is ejected from the spray head 5 rotating at the rotation speed for eIr and #. The ejected expelled particles try to scatter radially from the injection casting WR3, but their direction is changed by the air ejected from the inner and outer chambers mentioned above.
It erupts in front of Jtm head 5.

(Problems to be Solved by the Invention) In the conventional example as described above, the area where the paint in the cup-shaped spray head 3 comes into contact with the liquid, and this area is also the area where the cleaning sinker comes into contact with the liquid. However, as shown in Figure 5, the paint sink in the middle part of the spray head 5 is usually a part where the cleaning sink does not come in contact with the liquid, and the paint is atomized during painting. The part BK to which the particles adhere is not cleaned because no cleaning sinker is supplied, which causes the following problem.

■ Paint particles accumulate in the area BK where the cleaning sinker does not come into contact with the liquid, but this accumulation causes 7+2. Because paint particles are attracted by static electricity during painting and adhere to the object being painted,
Painting defects with colored spots occur on the surface of the object being painted.

■ Because paint particles accumulate in the screw hole of the fixing screw in the center of the spray head 3 for attaching the spray head 5 to the air motor 2, do not insert the tool into the screw hole (or replace the spray head 3). become unable.

The present invention has been made to solve these problems, and an object of the present invention is to provide a rotary atomizing electrostatic coating device that is capable of cleaning all parts of the spray head.

(Means for Solving the Problems) The present invention provides an air injector having a jetting diameter larger than the outer diameter of the spray head behind the cup-shaped spray head, and furthermore, an air injector having a jet diameter larger than the outer diameter of the spray head is provided behind the cup-shaped spray head. A cleaning sinker ejection nozzle that can spray a cleaning sinker is installed at the site.

(Function) When cleaning starts, air is ejected from the air injector, and washing sinker is further ejected from the washing sinker ejection nozzle. The cleaning sinker jetting nozzle can spray the cleaning sinker to any part of the inner surface of the spray head, thus making it possible to clean parts that are not in contact with the paint or the cleaning sinker.

(Example) Examples of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an insulated support 22 is attached to the top machine 20 via a bracket 21, an air motor 24 is attached to the insulated support 22 with a bracket 25, and the air motor 24
An air injector 25 and a cup-shaped spray head 26 are attached to the holder.

The air injector 25 has a circular housing 27t whose diameter is larger than the maximum outer diameter of the cup-shaped injector 26.

This housing 27 consists of an inner and outer double chamber.
Furthermore, a plurality of ejection holes are formed in the bottom surface of the housing 27.

Air supply hoses 28, 29 are connected to each of these chambers.

The cup-shaped spray head 26 is located in front of the air injector 25, below in the drawing, and its axis approximately coincides with the axis of the housing 27.

30 is a cleaning 7-hole valve and 31 is #1a cleaning F-pulp, which are attached to a manifold 32.

Additionally, manifold 32 includes a pair of force 2-valve 55.
54 is located and attached below the cleaning pulp 30, 31.

and pulp of each of these 30. ! ! '1,33゜54 includes sinker supply hose 30a and air supply hose 3.
1a, and paint supply hoses 33a and 34a are connected.

A first supply hose 55 is connected to the lower end of the manifold 32, and a trigger damper pulp 5 is connected to the first supply hose 35.
6 is connected to the trigger damper pulp 56, a second supply hose 37 is connected to the second supply hose 37, and a feed tube 58 is connected to the second supply hose 37. Then, paint, cleaning air, and cleaning sinker are supplied to the cup-shaped spray head 26 from the feed tube 3B.

An air cylinder 39 is fixed to the plaquette 25 via a stay 40, and its piston rod 39a is rotated by a rotary actuator 41 fixed to the cylinder body. Piston rod 59! A bracket 42 is fixed to the tip of the bracket 42, and a cleaning sinker jet nozzle 43 is fixed to the bracket 42.

The tip of this nozzle 45 faces into the cup-shaped spray head 26. 44 is a washing sinker supply hose connected to the nozzle 45.

Next, the operation of the rotary atomizing electrostatic coating apparatus having the above configuration will be explained with reference to FIG. When the painting is completed, the rotation speed of the cup-shaped spray head 26 reaches the cleaning rotation speed (approximately 6
00 Orpm), and at the same time air is ejected from the inner and outer chambers in the housing 27 of the air injector 25. The air from the inner chamber becomes quaping air along the outer circumferential surface of the spray head 26 as shown by arrow C9.
Air from the outer chamber is directed to the spray head 2 as shown by the arrow.
This becomes external air flowing around the outer circumference of 6.

In this state, the piston rod 3 of the air cylinder 59 is
9a is lowered and then the rotary actuator 41 rotates the piston rod 39a, the cleaning sinker jet nozzle 4s also rotates the piston rod 39at
- Rotate around the center. And nozzle 45 is l! The rotary actuator 41 is stopped when the Xg head 26 faces a predetermined position with respect to the inside 6 of the head.

On the other hand, at the same time as the cleaning starts, the cleaning thinner valve 50 and the cleaning air pulp 51 are opened alternately, and the cleaning air is supplied to the manifold 52, the first supply hose s5, the trigger valve in the open state, the pulp 56, and the second supply. It is fed into the spray head 26 through the hose 37 and feed tube 58, thereby cleaning the AwS location shown in FIG. Cleaning with cleaning air and a cleaning sinker is performed according to the set dead time, and these are performed alternately as described above, and finally, cleaning air is flowed.

When cleaning of the A8B position of the spray head 26 is completed in this way, by jetting a cleaning sinker from the cleaning sinker jet nozzle 43, the normal cleaning at the center of the spray head 26 is performed.
Cleaning by this nozzle 4s, which cleans the area B where the paint or the cleaning sinker does not come into contact with, is also carried out within a predetermined period of time.

When the cleaning by the nozzle 4'5 is completed in this way, G!
-7177 The cleaning sinker ejection nozzle 45 is rotated by the cutter 41, and then the piston rod 39a is raised, so that the nozzle 43 is retracted from the front side of the spray head 26 so as not to become an obstacle during painting.

Note that the air injection device 25 continues to operate even during cleaning with the cleaning sinker jetting nozzle 45, and blows off and dries the cleaning sinker dripping from the spray head 26, and the nozzle 43 continues to operate as described above from the spray head 26. At the time of retreat, the operation of the air injection device 25 is stopped and all cleaning operations are completed. When cleaning is completed in this way, one of the two pulps 55, 54 is opened and paint of a different color than before cleaning is supplied to the spray head 26 to prepare for the next color coating. During this time, air is ejected from the air injector 25 to prevent paint from scattering.

(Effects of the Invention) As explained above, the present invention is equipped with a cleaning sinker ejection nozzle capable of injecting a cleaning sinker to any part on the inner surface of the cup-shaped spray head. This makes it possible to clean areas that could not be cleaned beforehand, and thus prevents color splatter, color spots, etc. from occurring on the object to be coated.

In addition, since the spray head can be completely cleaned every time it is cleaned, there is no need to manually clean parts that are incompletely cleaned, as in the past, and the man-hours required for maintenance and inspection are greatly reduced. can.

[Brief explanation of the drawing]

Fig. 1 is a front view of the rotary branching Seiden coating device according to the present invention, Fig. 2 is a working process diagram of the device shown in Fig. 1, and Fig. #I5 is a part that can be cleaned by the device shown in Fig. 1. Fig. 4 is a front view of a conventional rotary atomizing device, and Fig. 5 is a plan view of the spray head showing the parts that can be cleaned by the device shown in Fig. 4. . 25.-Air injection machine 26...Cup-shaped spray head 45...Cleaning 7-hole spray nozzle Fig. 1 25-9. qkiyui 荊鴇26 -, 77,. 7'l, 1 (Ell 1 [43...
Figure 4, Figure 5

Claims (1)

[Scope of Claims] An air injector having a jetting diameter larger than the outer diameter of the spray head is provided behind a cup-shaped spray head that sprays paint, and a cleaning thinner is further provided at any part of the inner surface of the cup-shaped spray head. A rotary atomizing electrostatic coating device characterized by being equipped with a cleaning thinner jetting nozzle capable of spraying cleaning thinner.