JP3412088B2 - Painting gun equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating gun device for spray-painting an object to be coated.

[0002]

2. Description of the Prior Art It is known to attach a hood to a coating spray gun device, and FIG. 6 shows a conventional device. 1 '
Is a spray gun body, 2'is a jet nozzle body at the tip of the body,
3'is a hood mounted around the injection nozzle body,
Reference numeral 4'denotes an injection nozzle body tightening nut, which has a structure in which the hood 3'is fixed to the outer periphery thereof by using a bolt 5 ', and which is atomized by operating the lever 1'a on the main body 1 side. 6'is sprayed on the object 7'to be coated as a fine line. When the liquid pressure of the above apparatus is set to 40 atm to 250 atm, the best coating distribution can be obtained when the spray distance is 30 cm to 35 cm away from the coated surface. As a result, at a distant position, the sprayed paint loses its penetrating power and most of the paint is scattered around.

In the above, although the coating liquid 6'has its radiation direction determined by the hood 3 ', it is scattered randomly under the influence of the wind. This means uneven coating and coating. It causes the decrease in efficiency.
That is, in outdoor painting at a shipyard or the like, the adhesion rate of the paint to the painted surface is 50% or less, which causes not only the uneconomical problem of the paint but also the environmental problem around the factory due to the scattering of the paint. The current measures to solve this problem are to consider the wind direction and stop the painting work or use a scattering net.

As a solution to the above problems, the present inventor intends to increase the particle velocity of the coating liquid at the stage of use, and to reduce the particle velocity even when the facing distance to the object to be coated is large. No. 10-48848 was previously proposed as a device which is uniform and prevents dust from scattering, which was registered as a patent No. 2917013.

[0005]

The above patented invention is shown in FIG.
Compressed air 8'on the cone or disk hood 7'as shown in
Is introduced into the hood 7 ', and outside air is also introduced from a large number of ventilation holes 10' formed in the hood 7 '. Is accelerated and the adhesion efficiency is improved (in the conventional product, the particle velocity decreases due to the contact resistance between the paint and air, and the particles become ultra-fine particles and scatter). It is understood that the resistance of the hood body affects the work efficiency of the worker, and this becomes a serious problem as the tip of the handle of the spray gun body becomes longer and the work becomes longer. In view of the above points, the present invention has been devised to reduce the outer diameter of the hood body to reduce the resistance.

[0006]

According to the present invention, a coating liquid jet nozzle body is provided in a central portion, and a hood body is detachably attached around the jet nozzle body in the hood body. A ring-shaped fossa is formed, and a plurality of main through holes are formed on the front surface of the hood body at equal intervals, and the main through holes and the fossa are inserted, and the fossa is externally inserted into the fossa. in addition to connecting the inlet pipe for blowing compressed air, evenly spaced a predetermined magnitude outside air inlet of the outside air flows between the mounting in the circumferential surface and the injection nozzle body outer circumferential surface of the at injection nozzle body to the hood body It is assumed that multiple items are formed in.

At this time, the outer diameter of the hood body is about 5c.
m, and the outside air inflow hole is formed in an arc chord shape between the outer periphery and the injection nozzle body. Further, a part or the whole of the front wall of the hood body may be formed into an inclined wall surface that expands outwardly toward the front, and the main through hole formed in the hood body is the center of the injection nozzle body. The angle of inclination is 1 ° to 15 ° with respect to the straight line passing through, and at a position slightly outside of these main through holes,
In addition, another sub-through hole is bored so as not to overlap with the main through-hole, and the sub-through hole is formed with an inclination angle of 10 ° to 25 ° with respect to a straight line and a parallel line passing through the center of the injection nozzle body. Shall be.

[0008]

1 is a perspective view of a hood body according to the present invention, and FIG. 2 is a longitudinal sectional view of the same. In the present invention, the hood body 1 is composed of a base body 1A having a convex cross-section and a lid body 1B having a concave cross-section, and a male screw m is formed on the outer peripheral surface of the central projection body 2 of the basic body 1A. A plurality of notches k are formed on the inner peripheral surface of the cavity 2 so that a hexagon bolt for fastening a jet nozzle body, which will be described later, can be locked, and the corner portions of the hexagon bolt are engaged and fixed to the notches k. A plurality of outside air inflow holes 3 having an arc chord shape are formed at equal intervals between the inner peripheral surface of the hollow and the hollow.

Reference numeral 4 is a set screw for fixing the base body 1A to the outer peripheral hexagon bolt of the injection nozzle body, and 5 is the base body 1.
A compressed air introduction pipe port provided on the rear surface side of A, and the compressed air introduced through the pipe port is jetted to the outer peripheral step portion g of the protrusion 2 on the front surface side of the base body 1A. .

On the other hand, a ring-shaped lid 1 having a concave cross section
B is provided with a female screw n for screwing with a male screw m engraved on the outer peripheral surface of the projection 2 of the base 1A on the inner peripheral surface of the inner hole, and is formed near the peripheral edge on the back surface side. The recess 6 forms a fossa s for accumulating the compressed air together with the step portion g of the base body 1A by screwing. In addition,
A large number of through holes 7 (main through holes) are formed at equal intervals from the fossa s toward the front surface side of the lid body 1B. In each of the main through holes 7, the hood body is an injection nozzle body. When mounted on the outer periphery of the, 1 ° to 1 with respect to the line parallel to the line passing through the center nozzle hole
A tilt angle θ of 5 ° is formed.

On the other hand, 8 is another through hole (sub through hole) formed at a 1/4 minute position on the circumference slightly outside the position where the main through hole 7 is formed. In the illustrated example, the former through holes 7 are provided in the middle of two jumping locations. Thus, each of the sub through holes 8 is formed with an inclination angle θ ′ of 15 ° to 20 ° with respect to a line parallel to the line passing through the central nozzle hole of the jet nozzle body. The sub-through holes 8 are not limited to the above four holes, and two, six, and eight even holes can be provided symmetrically.

FIG. 3 is a front view when the hood body having the above-described structure is attached to the injection nozzle body 2 ', and FIG. 4 is a longitudinal sectional view of the same, wherein the hexagon bolt is different from the hexagon bolt 9 on the outer periphery of the injection nozzle body. 9 and the notch k on the inner peripheral surface of the nozzle body are fitted so as to engage with each other, and the set screw 4 is tightened to fix the nozzle. At this time, the arc-shaped outside air inflow holes 3 are formed at equal intervals between the outer circumference of the hexagon bolt 9 and the inner circumference of the hood body 1, as shown in FIG.

FIG. 5 is a use state diagram, and a compressed air pipe 10 from a compressor device (not shown) is connected to the compressed air introduction port 5. Then, the coating solution is sprayed from the spray nozzle of the coating gun device. At this time, the coating solution 11 is surrounded by the nozzle hole. Compressed air is ejected from the main through hole 7 and the sub through hole 8. That is, the compressed air introduced from the compressed air introduction port 5 in the hood body enters the fossa s and is stored in the chamber s, and the hood passes through the main through hole 7 and the sub through hole 8. This is to prevent the spray coating liquid from the spray nozzle body from being sprayed toward the front of the body 1 and being accidentally diffused to the periphery.

At this time, the outside air inflow hole 10 formed between the outer peripheral surface of the hexagonal bolt 9 of the injection nozzle body and the inner peripheral surface of the hood body 1 is exposed to the outside air from the back side of the hood body as the compressed air is injected. Is made to flow toward the front side,
This contributes not only to the atomization of the paint spray liquid sprayed from the spray nozzle body but also to the increase of the flow speed of the spray liquid to contribute to the improvement of the adhesive force of the coating liquid.

By injecting the compressed air in the above, inclining the main through hole 7 to the inclination angle θ of 1 ° to 15 °, the outer periphery of the paint spray liquid ejected from the central hole is compressed by the compressed air. This is to prevent the spray liquid from being dusted and scattered by being wrapped in the swirl flow 12 and to perform a uniform and non-density coating work. That is, when the inclination angle is θ, the most preferable swirl flow 12 is formed due to the relationship of the rotation of the earth by many experiments by the present inventor, and further, a little outside the position where the main through hole 7 is located. In addition to the above-mentioned effects, the compressed air similarly jetted from the sub-through holes 8 formed in one of the locations contributes to the improvement of the uniformity of the special coating film thickness. The best results were obtained when the inclination angle θ ′ was 15 ° to 20 °.

[0016]

The present invention is constructed as described above, and the injection nozzle is provided with the ventilation hole formed in the hood body in Japanese Patent No. 291701 without directly forming the ventilation hole in the hood body. Since it is formed around the hexagonal bolt that is attached to the body, the size of the hood body 1 can be relatively small, that is, the outer dimensions can be up to about 5 cm. The resistance of the worker who swings the coating gun can be reduced, which makes the work easier and contributes to the improvement of work efficiency. This effect becomes more remarkable as the pattern of the painting gun becomes larger.

[Brief description of drawings]

FIG. 1 is a perspective view of a hood body according to the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a front view in which the hood body is attached to an injection nozzle body.

FIG. 4 is a vertical sectional view of FIG.

FIG. 5 is a usage state diagram.

FIG. 6 is a general conventional device.

FIG. 7 is a proposal by the present inventor.

[Explanation of symbols]

1 hood body 1A base 1B lid 2 protrusion 3 Outside air inflow body 4 set screw 5 Compressed air inlet port 6 recess 7 main holes 8 Sub-hole 9 Hexagon bolt 11 Spray liquid 12 swirling flow

Claims (2)

(57) [Claims] 1. A coating liquid injection nozzle body is provided in a central portion,
A hood body is detachably attached around the injection nozzle body to form a ring-shaped cavity in the hood body, and a plurality of main through holes are equidistantly formed on the front surface of the hood body. To connect each main through hole to the fossa chamber, and to connect an introduction pipe for blowing compressed air from the outside into the fossa chamber, and to attach the injection nozzle body to the hood body. A coating gun device, characterized in that a plurality of outside air inflow holes of a certain size for inflowing outside air are formed at equal intervals between the inner peripheral surface and the outer peripheral surface of the injection nozzle body. 2. The coating gun apparatus according to claim 1, wherein the outer diameter of the hood body is about 5 cm, and the outside air inflow hole is formed in an arc chord shape between the outer periphery of the hood body and the injection nozzle body.