JP2003038988A - Automatic spray gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a dense and uniform silver mirror surface having excellent brightness by increasing the mixing precision of a first liquid with a second liquid which cause the silver mirror reaction. SOLUTION: A first discharge part 2 having a coating material nozzle 6 to be opened/closed with a needle valve 5 and an air nozzle 7 surrounding the front end and second discharge part 3 having a coating material nozzle 11 to be opened/closed with a needle valve 10 and an air nozzle 12 surrounding the front end are arranged side by side in the front surface of a gun body 4. The first liquid discharged as fog and the second liquid discharged as fog are capable of intersecting each other at the front side of the gun body 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sprayer for simultaneously spraying a first liquid, which is a metal salt-containing solution, and a second liquid, which is a reducing agent-containing solution, to form a silver mirror surface on a surface to be coated by the silver mirror reaction. Regarding cancer.

[0002]

2. Description of the Related Art Recently, a technique of forming a silver mirror surface on various coated surfaces of metal, synthetic resin, rubber, wood, etc. by a spray method instead of a plating bath has been disclosed in JP-A-11-335585.
It is proposed in Japanese Patent Publication No. 8 and the like.

In this method, a first liquid, which is a metal salt-containing solution, and a second liquid, which is a reducing agent-containing solution, are simultaneously sprayed, and the first liquid and the second liquid are brought into contact with each other and reacted on the surface to be coated. Since a silver mirror surface is obtained, compared to the one that is immersed in a conventional plating bath, large-scale equipment is not required, the equipment cost and equipment space can be significantly reduced, and the work is easy and easy. It has many advantages such as a reduction in time.

[0004]

However, in order to efficiently form a dense and uniform silver mirror surface excellent in glossiness, the first liquid and the second liquid ejected in the form of mist are applied to the surface to be coated. It is necessary to mix as uniformly and stably as possible above. To this end, a dedicated automatic spray gun capable of ejecting the first liquid and the second liquid in a mist state so as to intersect in front of the gun body is used, and the surface to be coated is positioned at the intersecting position.
It is important to spray the liquid and the second liquid.

Therefore, according to the present invention, the first liquid and the second liquid can be discharged in the form of mist so that they can intersect in front of the gun body.
It is an object of the present invention to provide an automatic spray gun capable of enhancing the mixing accuracy with a liquid and efficiently forming a dense and uniform silver mirror surface having excellent gloss.

[0006]

In order to achieve the above object, the invention of claim 1 of the present application is a solution containing a metal salt.
Spraying the liquid and the second liquid, which is the reducing agent-containing solution,
An automatic spray gun for forming a silver mirror surface on a surface to be coated by the silver mirror reaction, which has a paint nozzle opened and closed by a needle valve and an air nozzle surrounding the front end thereof to discharge the first liquid in a mist state. A second discharge part for discharging the second liquid in a mist state having one discharge part, a paint nozzle opened and closed by a needle valve, and an air nozzle surrounding the front end thereof is arranged in parallel on the front surface of the gun body. A first liquid from the first discharge part,
It is characterized in that the second liquid from the second discharge portion is discharged so as to intersect with the front of the gun body.

According to the invention of claim 2, the axis of each needle valve is parallel to each other, and the rear end of each needle valve slides back and forth in the cylinder chamber by turning on and off the working air. Square holes that are connected to two pistons and open on both outer sides sandwiching the first and second discharge portions are formed on the front surface of the gun body, and the pattern air discharged from the square holes allows It is characterized in that the first liquid from the first discharge portion and the second liquid from the second discharge portion are crossed in front of the gun body.

According to the invention of claim 3, the needle valves are inclined so that their axial centers intersect with each other, whereby the first liquid from the first discharge portion and the second liquid from the second discharge portion are discharged. Second
The liquid is made to intersect with the front of the gun body, and the rear end of each needle valve is connected to a piston that slides back and forth independently in the cylinder chamber by turning on and off the working air.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described together with the illustrated example. FIG. 1 is a front view of the automatic spray gun of the present invention, FIG. 2 is a bottom view thereof, and FIG. 3 is I-I of FIG.
It is a line sectional view. 1 to 3, an automatic spray gun 1 sprays a first liquid, which is a metal salt-containing solution, and a second liquid, which is a reducing agent-containing solution, onto a surface to be coated at the same time, and the silver mirror reaction causes the same to spray onto the surface to be coated. It is an automatic spray gun that forms a silver mirror surface and is remotely controlled by being attached to a computer-controlled painting robot.

As the metal salt-containing solution which is the first liquid, an ammoniacal silver nitrate solution prepared by adding ammonia and an aqueous solution of sodium hydroxide to an aqueous solution of silver nitrate is generally known. As the second solution containing a reducing agent, an aqueous solution containing a reducing agent such as sodium gluconate, glucitol, glucose, tartaric acid and formaldehyde and a strong alkaline component such as sodium hydroxide and potassium hydroxide is generally known. ing.

Further, the automatic spray gun 1 includes a first discharge part 2 for discharging the first liquid in a mist state, and a second discharge part 3 for discharging the second liquid in a mist state. 4 side by side. Then, the first liquid from the first discharge part 2 and the second liquid from the second discharge part 3 are discharged so as to intersect with each other, so that the first liquid and the second liquid are uniformly mixed. It is possible to efficiently form a dense and uniform silver mirror surface having excellent gloss.

As shown in FIG. 3, the first discharge part 2 comprises a paint nozzle 6 which is opened and closed by a needle valve 5 and an air nozzle 7 which surrounds the front end thereof.
The first paint flow path 9 extending from the first liquid inlet A1 connected to the first liquid supply source Q1 is in conduction.

The second discharge part 3 has substantially the same structure as the first discharge part 2 and comprises a paint nozzle 11 which is opened and closed by a needle valve 10 and an air nozzle 12 which surrounds the front end thereof. . The paint nozzle 11 has a second paint flow passage 1 extending from a second liquid intake A2 connected to a second liquid supply source Q2.
3 is conducting.

The air nozzles 7 and 12 are connected to a common blowing air passage 14 extending from an air intake B1 connected to a blowing air supply source P1.

In more detail, the gun body 4
Includes, for example, a rectangular block-shaped case body 15 and an air cap 16 attached to the front end thereof.
Is composed of a front case 15F in which the first and second paint flow paths 9 and 13 and the blowing air flow path 14 are formed, and a rear case 15R bolted to the front case 15F.

As shown in FIG. 4, the front case 15F has a large-diameter first boss portion 19 having an external thread and a small-diameter second boss portion 20 having an external screw at the front end of the rectangular base portion 17. And a nozzle housing hole 2 for housing the paint nozzles 6 and 11 at the front end of the second boss portion 19.
1, 21 are arranged side by side. Further, each nozzle housing hole 21 is connected to a lateral hole-shaped hole portion 22 extending rearward from the bottom surface thereof, and one hole portion 22 is connected to a vertical hole-shaped hole portion 23 extending from the first liquid intake port A1. . The other hole 2
2 is a vertical hole-shaped hole portion 2 extending from the second liquid inlet A2.
3 becomes conductive.

Therefore, in this example, the first liquid intake A1
The first paint flow passage 9 is formed by the hole portions 23, 22 extending from the second paint flow path 13, and the second paint flow passage 13 is formed by the hole portions 23, 22 extending from the second liquid intake port A2.

Next, each of the paint nozzles 6 and 11 has a tapered cone-shaped nozzle portion 24 having a coating liquid discharge port 25 opened at the front end.
A has an A, and an insertion portion 24C that is connected in a stepped manner via a body portion 24B and is inserted and held in the nozzle housing hole 21 is integrally formed on the rear end side thereof.

The paint nozzles 6 and 11 are prevented from coming off by a disc-shaped fixing plate 27 arranged at the front end of the second boss portion 20. The fixing plate 27 has an insertion hole 27A through which the body portion 24B passes, and the rear surface of the fixing plate 27 engages with the stepped portion 24S of the coating material nozzle 6, so that the coating material nozzle 6, 1
Fix 1 and fix it. Further, the fixing plate 27 is attached by being sandwiched between the ring-shaped collar portion 26A at the front end of the cap nut 26 screwed to the second boss portion 20 and the front end of the second boss portion 20.

The needle valves 5 and 10 for opening and closing the paint nozzles 6 and 11 are provided with a nozzle hole 29 and a hole portion 2, respectively.
2 concentrically and extends rearward, and each rear end is, in this example, a cylinder chamber 30 (shown in FIG. 5) due to turning on and off of working air.
It is connected to one piston 31 which slides back and forth inside.
That is, the needle valves 5 and 10 interlock with each other, and the paint nozzles 6 and 1
1 can be opened and closed at the same time. At this time, the axes of the needle valves 5 and 10 are arranged parallel to each other.

Here, in order to mix the first liquid and the second liquid as evenly and smoothly as possible, the central distance L between the paint nozzles 6 and 11, that is, the coating liquid discharge ports 25 and 25.
It is preferable to set the center distance L between them as small as possible. For this reason, as described above, a compact structure in which the paint nozzles 6 and 11 are fixed by using the fixing plate 27 and the cap nut 26 is adopted. Thereby, the center distance L is 10.0 mm or less, 6.5 mm in this example.
Can be reduced to a degree. Further, the structure in which the needle valves 5 and 10 are pulled by one piston 31 is also compact and can be suitably used in the present application.

Next, the air cap 16 is connected to the first cap.
A cap nut 32 (shown in FIG. 3) screwed to the boss portion 19 attaches the inner flange 16A to the front surface of the boss portion 19 in abutment.

The air cap 16 has, on its front surface, air nozzles 7 and 12 which are annular holes surrounding the front ends of the paint nozzles 6 and 11, and the air nozzles 7 and 12 are located inside the air cap 16. Is connected to the air reservoir 33 formed in the above. The air reservoir 33 is the air intake B.
1 is connected to the guide hole 34. Therefore, in this example, the blower air flow path 14 is formed by the guide hole 34 and the air reservoir 33.

Further, in this example, since the axes of the needle valves 5 and 10 are parallel to each other, the first liquid and the second liquid are discharged from the first and second discharge portions 2 and 3 in parallel to each other. To be done. Therefore, in this example, on the front surface of the air cap 16, the first,
2 which protrudes to the front on both outsides sandwiching the second discharge parts 2 and 3
The corner portions 35 of the book are formed, and at each corner portion 35, a square hole 35A extending diagonally forward is formed.
The square hole 35A communicates with the air reservoir 33 and discharges pattern air.

Therefore, the mist-like first liquid and the second liquid discharged from the first and second discharge portions 2 and 3 are bent under the influence of the pattern air and cross each other in front of the gun body 4. You can. The term “intersect” means that the center lines of the atomized bodies ejected from the respective ejection parts 2 and 3 intersect. At this intersecting position, the first and second liquids can be mixed most uniformly. Therefore, by positioning the surface to be coated at this intersecting position and spraying, a fine and uniform silver mirror surface with excellent glossiness can be obtained. Can be formed efficiently.

Next, as shown in FIG. 5, the rear case 15R has a rectangular base portion 40, and the rear end thereof has the cylinder chamber 30 in which the piston 31 can slide back and forth due to turning on and off of working air. Is formed. The rear end of the cylinder chamber 30 is closed by a lid 41, and a spring piece 42 for urging the piston 31 forward is arranged between the lid 41 and the piston 31.

An air inlet B2 connected to the working air supply source P2 is opened on one surface of the base 40, and the working air passage 36 extending from the air inlet B2 is
Conduction is made at the front end of the cylinder chamber 30.

Reference numeral 44 in FIG. 5 is a mounting member for mounting the automatic spray gun 1 to the painting robot, and reference numeral 45R is fitted with a locking projection 45F projecting at the rear end of the front case 15F. This is the locking recess positioned by the above.

Usually, the first liquid exhibits a strong acidity, while the second liquid exhibits a strong alkalinity. Therefore, in this example, the case body 15 is divided into a front case 15F and a rear case 15R, and the front case 15F is formed by using a synthetic resin, such as trifluoroethylene chloride resin, which has excellent corrosion resistance to acids and alkalis. There is. Further, in this example, the air cap 16 and the cap nuts 26 and 32 are also made of the corrosion-resistant synthetic resin.

Next, referring to FIG. 6, the automatic spray gun 1 of the present application.
Another embodiment will be described. In this example, the needle valves 5 and 10 are
The axes are inclined so that they intersect each other. Accordingly, the paint nozzles 6 and 1 that are concentric with the needle valves 5 and 10.
1 and the air nozzles 7 and 12 are also inclined in the intersecting direction. As a result, the first liquid and the second liquid from the first discharge part 2
The second liquid from the discharge part 3 of the above crosses with each other in front of the gun body 4 by the spraying as it is and is mixed uniformly.
In this case, the square hole 35A can be removed from the air cap 16.

Further, pistons 31L and 31R that slide independently in the front and rear directions in the cylinder chambers 30L and 30R are connected to the rear ends of the needle valves 5 and 10 by turning on and off the working air. Also at this time, since the pistons 31L and 31R slide by the common working air, the needle valves 5 and 10 are substantially interlocked and the paint nozzles 6 and 11 can be simultaneously opened and closed.

Although a particularly preferred embodiment of the present invention has been described above in detail, the present invention is not limited to the illustrated embodiment, and various modifications can be made and implemented.

[0033]

Since the present invention is constructed as described above,
The first liquid and the second liquid can be ejected in a mist form so that they can intersect in front of the gun body, the mixing accuracy of the first liquid and the second liquid can be increased, and a dense and uniform silver mirror surface with excellent gloss can be efficiently obtained. Can be formed.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an automatic spray gun of the present invention.

FIG. 2 is a bottom view thereof.

3 is a cross-sectional view taken along line I-I of FIG.

FIG. 4 is an exploded perspective view showing the front half of the automatic spray gun.

FIG. 5 is an exploded perspective view showing the rear half of the automatic spray gun.

FIG. 6 is a sectional view showing another embodiment of the automatic spray gun.

[Explanation of symbols]

2 First discharge part 3 Second discharge part 4 gun body 5, 10 needle valve 6, 11 paint nozzle 7, 12 Air nozzle 30 cylinder chamber 31 pistons 35A square hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takanori Yoshida             2-3-14 Tagawa, Yodogawa-ku, Osaka-shi, Osaka             Meiji Machine Works Co., Ltd. (72) Inventor Kazuyoshi Fuchida             2-3-14 Tagawa, Yodogawa-ku, Osaka-shi, Osaka             Meiji Machine Works Co., Ltd. F-term (reference) 4F033 QA01 QB02Y QB03X QB12Y                       QB17 QD02 QD21 QD25 QE09                       QE16 QE21 QE22 QF21X                       QK22X QK27X QK27Y

Claims (3)

[Claims] 1. An automatic spray gun for spraying simultaneously a first liquid, which is a solution containing a metal salt, and a second liquid, which is a solution containing a reducing agent, to form a silver mirror surface on a surface to be coated by the silver mirror reaction, which is a needle. A first discharge part having a paint nozzle opened and closed by a valve and an air nozzle surrounding the front end thereof, and discharging the first liquid in a mist state, and a paint nozzle opened and closed by a needle valve and an air nozzle surrounding the front end. And a second discharge part for discharging the second liquid in a mist state are arranged side by side on the front surface of the gun body, and the first liquid from the first discharge part and the second discharge part from the second discharge part An automatic spray gun that discharges the second liquid so that it can intersect with the front of the gun body. 2. The needle valves have their axes parallel to each other, and the rear end of each needle valve is connected to one piston that slides back and forth in the cylinder chamber by turning on and off the working air. At the same time, on the front surface of the gun body, square holes that open on both outer sides sandwiching the first and second discharge parts are provided, and the pattern air discharged from the square holes causes the pattern air to be discharged from the first discharge part. The automatic spray gun according to claim 1, wherein the first liquid and the second liquid from the second discharge portion are made to intersect each other in front of the gun body. 3. Each of the needle valves is inclined in a direction in which its axis intersects with each other so that the first liquid from the first discharge part and the second liquid from the second discharge part are 2. The automatic machine according to claim 1, wherein the needle valve intersects with the front of the gun body, and the rear end of each needle valve is connected to a piston that independently slides back and forth in the cylinder chamber by turning on and off the working air. Spray gun.