JPH1199341A - Coating machine with ion generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form high-quality coating films on the coating surface of an object to be coated by disposing ion generators of positive and negative ion discrete systems or positive and negative ion composite systems which radiate respective positive and negative ions entrained in compressed air toward the inside of the spraying range of a coating material near a coating machine for executing coating by spraying the coating material. SOLUTION: A main body 1 of the coating machine is provided with pattern air blow-off nozzles 2, 2 above and below an injection nozzle 3 in the central part of a head 1H. The coating material sprayed from the injection nozzle 3 through a hose 3R for the coating material is entrained in the pattern air blown off from the respective blow-off nozzles 2 and are applied on the object HT to be coated. In such a case, the positive ion generator 4 and negative ion generator 5 of a single electrode type are disposed near the coating machine. The positive ions PT and negative ions MT radiated to entrain in the compressed air of the heads 4H, 5H of the respective generators 4, 5 are blown into the spraying range TR of the coating material sprayed from the injection nozzle 3 and are uniformly mixed with the coating material particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of spray coating various products and parts (hereinafter simply referred to as "objects to be coated") so as to form a more advanced coating film. The present invention relates to a coating machine provided with a generator.

[0002]

2. Description of the Related Art Usually, an object (non-conductive material) in the air
Is charged by static electricity, the surface of the object to be coated is charged in a state in which positive and negative charges are arranged irregularly, and this static electricity attracts dust (floating dust) in the air to be coated. It was attached to the surface of the object.

If the object to be coated in the charged state is spray-coated as it is in a normal atmosphere, dust attached to the object causes a coating failure. Debris was removed by air blowing or brushing the surface of the object.However, when air blowing or brushing was performed, the power charged on the surface of the object increased on the contrary due to air friction and the opposite effect was caused. There was a problem.

[0004] Therefore, the surface of the object to be coated is removed by a corona discharge air blow in a pre-coating process, or
It has been considered that the entire work space for painting is humidified (generally 70% humidity and a temperature of about 20 ° C.) by applying forced air to make it electrostatic-free, and then painting is performed.

[0005]

However, the dust removal countermeasure by the corona discharge air blow is effective during the air blow process, but at the end of the process, the object to be coated starts to take on static electricity again, and the painting operation is started. At this point, the charged state is restored to the original state, so that the problem of dust adhesion could not be fundamentally solved.

[0006] In addition, the antistatic measures by humidification result in an atmosphere where mold is most likely to occur when environmental considerations are taken into account. There was a problem that the mold floating inside had a bad effect on the health of workers.

On the other hand, regarding the finished state of the spray coating, the atomized paint particles which are spray-atomized potentially have a positive charge, and are unstable by a single charge. However, most of the paint particles reach the object to be coated, before and after neutralization, due to the speed of the spray air, before and after neutralization of particles having positive and negative charges. Since it combines with the negative charge on the painted object side and repels the positive charge, there has been a problem that this phenomenon forms unevenness of the coating film (yuzu skin, scale, etc.) based on the unevenness of the coating film.

In addition, the above-mentioned paint particles repelled by the positive charges may be combined with the negative charge particles in the air as described above, but the number is small and sufficient. However, since the binder paint particles are repeatedly applied to the coating film surface, there is a problem that the coating surface becomes uneven and the finish becomes extremely poor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spray coating of various objects to be formed, whereby a high quality coating film can be formed on the surface of the object to be coated without any unevenness. It is to provide a coating machine devised as described above.

[0010]

Means taken by the present invention to solve the above-mentioned technical problems are as follows.

(1) A pneumatic atomization type, hydraulic atomization type, or rotary atomization type coating machine which sprays paint to perform coating, and puts compressed air near the coating machine. An ion generator of a positive / negative ion individual type or a positive / negative ion composite type that emits each positive / negative ion toward the spraying range of the paint is provided. (Claim 1)

(2) The inside of the head of the ion generator is formed as an air chamber to which compressed air is supplied, and an orifice for blowing out the carrier air is provided in front of the air chamber, and the ions provided in the air chamber are provided. The needle electrode of the generator is projected from the orifice to the front side. (Claim 2)

(3) The connection between the coating machine and the ion generator using a connection fitting configured so that both can be moved integrally and the angle and distance between the two can be freely adjusted. (Claim 3)

According to the first aspect of the present invention, the corona discharge based on the emission of positive and negative ions causes
Decompose molecules in the air to generate neutralizing ions sharing a positive charge and a negative charge, and further charge the neutralized ions uniformly to the sprayed paint particles,
In addition, the sprayed air can reach the coated surface of the object to be coated, and the charged surface can be attracted by the oppositely charged ions to bring the coated surface into a state of “0”, so that dust adheres to the coated surface. Can be prevented.

Further, according to the means described in the above (1), since the spray coating is carried out while the above neutralizing ions are mixed with the paint particles, the unstable positive charges of the paint particles are stable by the ions due to the ions. In the stage where the coating film is wet and the coating film showing fluidity is formed, the coating is performed in the wet state. The result is that the grains are attracted to each other and aligned, and since this state is continued during coating, it is necessary to form a coating film with no unevenness on the coated surface, high density and adhesion, and good quality. to enable.

According to the means of the second aspect described in the above (2), the ions radiated from the needle-shaped electrode of the ion generator are converted into compressed air which is vigorously jetted from the air chamber through a narrow orifice. Since it can be charged by sending it into the spraying range of the paint, it can be surely mixed with paint ions sprayed from the coating machine to prevent dust from adhering to the painted surface, It is possible to form a high quality coating film.

According to the third aspect of the present invention, before the ions radiated from the needle electrode of the ion generator disappear in the air, the ions are sprayed from the coating machine. The ion emission angle and distance can be freely adjusted to ensure mixing with the paint, and the ion generator can be moved integrally with the coating machine while maintaining the adjustment angle and distance. In addition, it is possible to obtain a high-quality coating film by performing a coating operation while always maintaining ion irradiation conditions in an optimum state.

As described above, the above (1) to (1)
By solving the above technical problem by means of (3),
The problem of the conventional technique can be solved.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a coating machine provided with an ion generator according to the present invention. FIG. In the drawings, 1 is a body (body) of a pneumatic atomizing type, a hydraulic atomizing type, or a rotary atomizing type coating machine, 1H is its head,
Is a paint spray nozzle provided at the center of the head, and 2 and 2 are pattern air blow nozzles provided above and below the spray nozzle 3, which are supplied under pressure through a paint hose 3R and sprayed from the spray nozzle 3. The paint to be sprayed is atomized air sprayed from around the spray nozzle 3 through the compressed air hose 2R, or the pattern air blown out from each of the pattern air blow nozzles 2 and 2, and further, a bell cup type coating. In the case of a machine (not shown), it is configured to fly on the rotary air of a bell cup and fly toward the object to be coated HT to apply the coating.

Also, reference numerals 4 and 5 shown in FIG. 1 denote a single-electrode type (individual type) positive ion generator and negative ion generator, and the heads 4H and 5H of the generators 4 and 5 supply compressed air. Positive ion PT and negative ion MT radiated by riding
Before each ion disappears in the air, the spraying range TR of the paint sprayed and sprayed from the spray nozzle 3 of the coating machine.
(Spray pattern) so as to be uniformly mixed with the paint particles.

In FIG. 2, reference numeral 6 denotes a composite electrode type ion generator for generating positive ions and negative ions simultaneously by applying positive and negative voltages. The mixed positive and negative ions PM radiated on the compressed air are also sprayed from the spray nozzle 3 of the coating machine and blown into the spraying range TR of the flying paint before disappearing in the air, and the paint PM It is configured to mix uniformly.

FIGS. 3A and 3B are a front view and a side sectional view, respectively, illustrating the structure of each of the heads 4H, 5H of the single-electrode ion generators 4, 5 described above. 5H
Is formed into an air chamber 8 for accommodating pressurized air supplied through a hose 8H and a passage 8A,
An orifice 7X for blowing out compressed air is formed on the front surface of the air cap 7.

In FIG. 3, reference numeral 9 denotes a positive ion or negative ion generator mounted inside the air chamber 8, 9K denotes a high voltage cable, and the needle-like electrode 9A of the ion generator 9 has the above-mentioned structure. The positive ions or negative ions radiated from the needle-shaped electrode 9A are projected forward through the orifice 7X on the compressed air blown vigorously from the orifice 7X as shown in FIG. It is configured to fly toward the spray range TR.

FIGS. 4A and 4B are a front view and a side sectional view illustrating the structure of the head 6H of the composite electrode type positive / negative ion generator 6 described above. The two air chambers 10 are separated by the partition plate 10A.
E, 10F, and the orifice in which the needle-shaped electrodes 11A, 12A of the positive ion generator 11 and the negative ion generator 12 attached to these air chambers 10E, 10F are opened on the front surface of the air cap 10. 10X, 10
Each of the electrodes 11A, 1
Positive ions and negative ions radiated from 2A are put on compressed air blown vigorously from each of the orifices 10X and 10Y, and as shown in FIG.
It is configured to fly inward.

FIGS. 5A and 5B show the integral movement between the main body 1 of the coating machine, the positive ion generator 4, the negative ion generator 5, and the positive / negative ion generator 6 described above. It is a side view and a plan view illustrating the structure of a connecting fixture XT that freely and freely adjusts an angle and a distance between the two.
Reference numeral 13A denotes a holder to which the holders 5 and 6 can be attached so that they can be moved back and forth.

Reference numeral 14 denotes a left-right swinging rotary shaft provided on the holder 13, 15 denotes a holder attached to the rotary shaft 14 so as to be adjustable in height, 15A denotes a tightening bolt thereof, and 16 denotes this holder. A holder 16A for the machine output shaft 17 integrally formed with 15 is a tightening bolt, and the holder 16 can swing up and down with respect to the machine output shaft 17 and can move in the axial direction (lateral direction). The machine output shaft 17 is attached to the main body 20 and moved up and down by a motor (not shown). The machine output shaft 17 is formed by a guide groove 21 having a length (L) formed in the machine main body 20 as shown in FIG. , And the main body 1 of the coating machine described above and the ion generators 4, 5,
6 are mounted so as to be able to operate integrally.

Accordingly, each ion generator 4, 5 or 6
By rotating or moving each of the holders 13, 15, 16 to freely adjust the mounting position, angle, or distance with respect to the main body 1 of the coating machine, each ion is air. It is configured such that each ion can be accurately emitted and mixed into the spraying range TR of the paint sprayed from the spray nozzle 3 of the coating machine before disappearing in the inside.

In FIG. 6, CV is a conveyor for moving the object to be coated HT by suspending it on a hanger HN.
The above-described coating machine and each of the ion generators 4, 5, and 6 can form a high-quality coating film by spraying paint and radiating positive and negative ions on the surface of the moving object to be coated HT. However, the structure of the connecting fixture XT described above is an example of the embodiment, and the structure of the connecting fixture described in claim 3 of the present invention is not limited to the illustrated one.

[0029]

The coating machine provided with the ion generator according to the present invention is as described above. The coating film spray-formed using the coating machine while radiating and mixing ions from the ion generator is as follows. Unlike coatings formed by general coating, there are no particles with positively and negatively biased charges, which makes it possible to form extremely stable, high-quality coatings. It has the advantage of being able to exhibit excellent characteristics without delamination due to oxidation phenomenon and no trace of air bubble state, and has the advantage that it can be used for coating objects to be coated of all properties such as metal, plastic, woodworking and enamel. ing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an entire coating machine according to the present invention including a single-electrode type ion generator.

FIG. 2 is a configuration diagram illustrating an entire coating machine according to the present invention including a composite electrode type ion generator.

3A is a front view illustrating the configuration of a head of the single-electrode ion generator shown in FIG. 1, and FIG. 3B is a side sectional view thereof.

4A is a front view illustrating the configuration of the head of the composite electrode type ion generator shown in FIG. 2, and FIG. 4B is a side sectional view thereof.

FIG. 5A is a side view showing an example of the connecting fixture used in the present invention, and FIG. 5B is a plan view thereof.

FIG. 6 is an overall configuration diagram illustrating a state where spray coating is performed using the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Painter main body 3 Paint spray nozzle 4 Positive ion generator 5 Negative ion generator 6 Positive / negative ion generator TR Spray range of paint XT Connection fixture HT Object to be coated

Claims (3)

[Claims] 1. A pneumatic atomizing type, a hydraulic atomizing type, or a rotary atomizing type coating machine for spraying paint to perform coating,
In the vicinity of the coating machine, a positive / negative ion individual type that emits positive and negative ions toward the spraying range of the paint by putting on compressed air, or a positive / negative ion combined type ion generator is provided. Coating machine equipped with an ion generator. 2. The inside of a head of an ion generator is formed as an air chamber to which compressed air is supplied, and an orifice for blowing out a carrier air is provided in front of the air chamber, and an ion generator provided in the air chamber is provided. 2. A coating machine provided with an ion generator according to claim 1, wherein a needle-like electrode of the vessel protrudes forward from said orifice. 3. The connection between the coating machine and the ion generator by using a connection fitting configured so that both can be moved integrally and the angle and distance between the two can be adjusted freely. A coating machine comprising the ion generator according to claim 1.