JPS6211903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic spray coating apparatus for electrostatic spray coating, for example, a narrow, elongated, meandering passage or an elongated tube.

Generally, an air spray gun of an internal mixing type (one that atomizes and mixes paint inside a spray nozzle member) is used for painting inside narrow, long and narrow meandering passages or long and narrow tubes.

However, the above-mentioned method of painting using a spray gun not only requires high air pressure for atomization, but also because the atomized paint is applied only to the area directly sprayed onto the object to be painted. It is difficult to evenly coat uneven, meandering passages and the inside of curved thin tubes (shadow areas that hit the back of the object to be coated), and the atomization pressure of air pressure is high. Therefore, the atomizing pressure air is
During disposal, the atomized particles of the paint that have been produced are peeled off and scattered, reducing the painting efficiency, using the paint uneconomically, and contaminating the atmosphere in the workplace. be.

On the other hand, in some countries and regions salt is sprayed on roads to eliminate snow damage caused by snow accumulation on roads. Therefore,
As a means of preventing car body corrosion when driving on roads that have been sprayed with salt, after the car body has been painted, atomized wax can be applied to the inner ribs and meandering gaps of the car body. Proposed.

However, with the above-mentioned painting means using an air spray gun, it is difficult to uniformly apply atomized wax inside narrow, narrow, and long meandering passages and pipes. Although it is possible to apply the liquid wax by dipping it, this method is not only uneconomical but also inconvenient for the completed vehicle body.

In view of the above-mentioned points, the present invention provides a spray nozzle member of an electrostatic coating machine with a connecting cylinder that forms a mixing chamber in a detachable manner, and connects a shield pipe that also serves as a gripping part to the connecting cylinder via a flexible tube. A nozzle member is removably attached to the tip opening of the shield pipe, and a discharge electrode connected to the injection nozzle member is extended through the joint body and the flexible pipe to the shield pipe. This generates an electrostatic atomized paint and paints the inside of a narrow narrow passage or the inner peripheral wall of a narrow tube body with an electrically charged atomized paint or electrostatically atomized wax. An object of the present invention is to provide an electrostatic spray coating device that is economical to use and also aims to improve coating efficiency.

Hereinafter, an embodiment of the present invention will be described in which wax is used as the coating material (paint).

In the figure, reference numeral 1 denotes a main body of an electrostatic coating machine, and a wax injection hole 2 is provided at the tip 1a of the main body 1. A valve) 3 is provided so as to be openable and closable. Further, a pressurized air supply hole 4 is bored in the tip portion 1a of the main body 1 in parallel with the injection hole 2, and this supply hole 4 communicates with a compression device of the electrostatic atomizer. Further, an injection nozzle member 5 made of a conductive material is removably provided at the tip portion 1a of the main body 1 with a locking nut 6, and this injection nozzle member 5 is connected to a wax flow path 7 having an ejection port 7a. The wax flow path 7 is connected to the injection hole 2, and the wax flow path 7 is connected to the injection hole 2. Furthermore, the air flow path 8 communicates with the supply port 4 .

Therefore, the needle valve 3 in the electrostatic coating machine
By opening the valve, wax passes from the injection hole 2 through the wax flow path 7 and is ejected from the ejection port 7a, and at the same time, compressed air passes from the supply port 4 through the air flow path 8 and is injected from the injection ports 8a and 8b. Here, the wax is atomized into fine particles by means of compressed air. Note that such a paint mixing method is called an external mixing method.

On the other hand, a joint cylinder 10 forming a mixing chamber 9 is removably attached to a locking nut 6 integral with the injection nozzle member 5 so as to enclose the injection nozzle member 5 from the outside. Moreover, the above-mentioned joint cylinder body 10
A hose joint 11 is attached to the tip opening 10a of the hose joint 11 with a cap nut 12, and one end 14a of a flexible tube 14 equipped with a sleeve 13 is connected to the hose joint 11 to ensure airtightness with a cap nut 15. Keep it connected. Furthermore, the other end 14b of the flexible tube 14 is connected to a hose joint 1 provided with a sleeve 16.
The hose joint 17 is connected to the hose joint 17 by a cap nut 18, and a shield pipe 19 made of an insulating material such as synthetic resin is provided by a cap nut 20. Further, an outer cylinder 19a that is integral with this shield pipe 19 also serves as a grip, and a hand switch 2 is attached to this outer cylinder 19a.
1 is attached.

On the other hand, the tip opening 1 of the shield pipe 19
A nozzle member 22 having a large number of injection holes 22a is removably attached to the nozzle 9b using a cap nut 23, and the nozzle member 22 is made of an insulating material such as synthetic resin. Furthermore, the discharge electrode 24 connected to a part of the injection nozzle member 5 is connected by a pin terminal 25, and is passed through the joint cylinder body 10 and the flexible tube 14 to the tip opening 19b of the shield pipe 19.
It has been extended to Therefore, this discharge electrode 2
The tip portion 24a of No. 4 is approximately
A discharge electrode of about 60 KV is constituted, and the fine particles of the atomized wax are charged with static electricity by the discharge phenomenon from the tip 24a of the discharge electrode 24, and are injected from each injection hole 22a of the nozzle member 22. , the object to be coated is electrostatically coated. Note that the tip portion 24a of the discharge electrode 24 is
When an electrostatic coating device is brought close to the object to be coated, it is separated by a distance that does not cause discharge (sparking).

Therefore, by inserting the injection hole 22a of the nozzle member 22 into the narrow, elongated, meandering passage or tube and turning on the hand switch 21, a high voltage is simultaneously applied to the discharge electrode 24. Since the needle valve 3 is opened, the wax is atomized into fine particles by the compressed air by the injection nozzle member 5, and these are uniformly mixed in the mixing chamber 9, as described above. However, flexible tube 1
The fine particle wax transferred through the shield pipe 19 is electrostatically charged by the discharging action from the tip 24a of the discharge electrode 24 extending to the shield pipe 19, and is injected from each injection hole 22a of the nozzle member 22 to the target. The painted body is electrostatically coated. In particular, since the wax is electrostatically charged, the wax will be applied to the back side (shadow area) of the object to be coated.

Incidentally, although the above-described embodiment has been described using wax, it goes without saying that liquid paint may be used instead of wax.

As described above, according to the present invention, the joint cylinder 10 forming the mixing chamber 9 is detachably provided in the injection nozzle member 5 of the electrostatic coating machine, and the joint cylinder 10 is connected to the injection nozzle member 5 through the flexible tube 14. Shield pipe 19 that also serves as a gripping part
A nozzle member 22 is detachably attached to the tip opening 19b of the shield pipe 19, and a discharge electrode 24 is connected to the injection nozzle member 5.
is extended to the shield pipe 19 through the joint body 10 and the flexible tube 14, so that the wax or paint that has been atomized into fine particles is charged with static electricity, and this is electrostatically applied to the object to be painted. Since the coating is applied by adsorption to the surface, it is not only possible to apply paint or wax economically and evenly, but also to cover the shadow areas on the back of the object to be coated using the adsorption force of static electricity. It has excellent effects such as being able to

[Brief explanation of the drawing]

The figure is a side view showing a half section of an electrostatic spray coating apparatus according to the present invention. DESCRIPTION OF SYMBOLS 1...Main body, 3...Needle valve, 5...Injection nozzle member, 9...Mixing chamber, 10...Joint cylinder body, 11
... hose joint, 14 ... flexible tube, 17 ... hose joint, 19 ... shield pipe, 21 ... hand switch, 22 ... nozzle member, 24 ... discharge electrode.

Claims (1)

[Scope of Claims] 1. A joint cylinder forming a mixing chamber is detachably provided in a spray nozzle member of an electrostatic sprayer, and a shield pipe which also serves as a gripping part is connected to this joint cylinder via a flexible tube. A nozzle member is detachably attached to the tip opening of the shield pipe, and a discharge electrode connected to the injection nozzle member is extended to the shield pipe through the joint body and the flexible tube to generate a discharge. An electrostatic spray coating device characterized by: 2. The electrostatic spray coating apparatus according to claim 1, wherein the shield pipe and the nozzle member are made of an insulating material.