JP2000005664A - Hood body for coating gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hood body which is of a simple structure and is low- priced and can be easily manufactured by combining a collared inner ring body having a center protrusion and a ringlike collar with an outer ring body having an annular ring body and installing the combination on the outer periphery of a nozzle body of an air spray gun coating device. SOLUTION: The hood body 10 is formed of a collared inner ring body 10a combined with an outer ring body 10b. The collared inner ring body 10a has a slant wall (m) spreading outward conically on the outlet side of an inner hole 12 in a center protrusion 11. In addition, a plurality of outer air inflow holes 13 are perforated circumferentially in the slant wall (m). Besides a compressed air guide-in hole 16 is perforated in a ringlike collar 15 formed in the outer peripheral direction to receive an introduction pipe to be connected. On the other hand, the outer ring body 10b has a female thread to be screwed to a male thread 14 of the center protrusion 11, nicked in the center inner hole 19 of an annular ring body 18 and an annular recess chamber is formed on the inner face side. At the same time, a plurality of projections 23 each of which has jet holes 22 perforated are provided jutting out on the outer peripheral face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hood for a coating gun used in an air spray gun coating apparatus.

[0002]

2. Description of the Related Art It is known to attach a hood to a coating spray gun device, and FIG. 4 shows a conventional device. 1 is a spray gun main body, 2 is an injection nozzle body at the tip of the main body, 3 is a hood mounted around the injection nozzle body, 4 is an injection nozzle body tightening nut, and the hood 3
Is fixed by using the bolt 5, and the coating liquid 6 atomized by the operation of the lever 1 a of the main body 1 is sprayed onto the workpiece 7 as a thin line.

[0003]

Although the coating liquid 6 atomized as described above has its radiation direction determined by the hood 3, the coating liquid 6 is scattered randomly by the influence of the wind. This causes uneven coating and a reduction in coating efficiency. That is, in outdoor painting at a shipyard or the like, the adhesion ratio of the paint to the painted surface is 50% or less, which causes not only the problem of the uneconomical property of the paint but also the environmental problem around the factory due to the scattering of the paint. Current measures to solve this problem, considering the wind direction, stop the painting work or use a splash prevention net. The present inventor has already proposed some appliances and devices to solve the above problems, but the present invention relates to a hood body of these appliances and devices, and a hood body product which has a simple configuration and is inexpensive and easy to manufacture. Is not proposed.

[0004]

According to the present invention, an inner hole exit side of a central projection is formed on an inclined wall which expands outward in a mortar-like shape, and several males are formed on the outer peripheral surface of the central projection. A flanged inner ring body formed by engraving a screw, forming a ring-shaped flange body having a constant width in an outer peripheral direction perpendicular to the screw, and forming a hole for introducing compressed air on a surface of the flange body; A female screw to be screwed with the outer male screw of the central projection is formed in the central inner hole, and the inner surface side is formed in the keyed cavity, and a plurality of compressed air jets are formed in the circumferential direction of the cavity. The outer ring body having the hole is combined with the outer ring body, and this is attached to the outer periphery of the nozzle body of the air spray gun coating apparatus. At this time, a wart-like projection is provided at a corresponding portion on the outer surface of the ring body in which a plurality of compressed air ejection holes are formed, and each projection is provided on the outlet side of the compressed air ejection hole. May have an inclination angle of 1 ° to 15 ° on the outlet side.

[0005]

FIG. 1 is a partially cutaway perspective view of a coating gun hood body 10 according to the present invention, and FIG. 2 is an exploded perspective view of the same. The coating gun hood body 10 of the present invention has a flanged inner ring body 10a as shown in FIG. 2A and an outer ring body 10b as shown in FIG.
It consists of two people.

As shown in the figure, the flanged inner ring body 10a is formed on a sloped wall m which expands outwardly from the exit side of the inner hole 12 of the central projection 11 having a convex shape. , The inclined wall m
A plurality of outside air inflow holes 13 are formed in the circumferential direction. Thus, several male threads 14 are engraved on the outer peripheral surface of the outlet-side inclined wall m of the central projection 11. Reference numeral 15 denotes a ring-shaped collar body having a constant width formed in an outer circumferential direction orthogonal to the ring-shaped body, and a compressed air introduction hole 16 is formed in one place serving as a flat plate body, and is introduced outside. A pipe 17 is provided to connect a compressed air pipe described later.

On the other hand, the outer ring body 10B is formed by engraving a female screw 20 to be screwed with the outer male screw 14 of the central projection 11 in the central inner hole 19 of the ring body 18, and the inner surface is keyed. An annular cavity 21 having a step k (see FIG. 1) is to be formed, and a plurality of compressed air ejection holes 22 are to be formed at equal intervals.

Reference numeral 23 denotes a wart-like projection formed at a corresponding location on the opposite outer surface side where the above-mentioned ejection hole 22 is formed. The outlet of the compressed air ejection hole 22 is opened at the center of each wart-like projection 23. It has become something. At this time, the compressed air ejection holes 22
Can be formed so as to be on the same parallel line as the direction O in which the coating liquid is ejected from the nozzle body, but 1 ° to 15 °
Or to have an angle of inclination of °. This is to cause a swirling flow to be described later.

In order to provide the inclination angle of the compressed air ejection hole 22, a jet nozzle tip having a separate through hole may be attached to a slightly larger hole so as to have a constant inclination angle. Good and it can be directly drilled to have a certain inclination angle. In this case, the exit surface n of the compressed air ejection hole which has become a wart-like projection in the latter case
Should preferably be a plane perpendicular to the inclination angle, so that the back pressure around the outlet of the compressed air ejection hole can be made uniform.

FIG. 3 is a view showing the state of use of the coating apparatus for an airless spray gun. The inner hole 12 of the center projection 11 of the hood body is fitted into the outer periphery of the spray nozzle body 2 for the coating liquid, and the set screw 24 is set. Use and fix. Thus, when the coating liquid 6 is sprayed from the spray nozzle body 2, at the same time, air from a compressed air generating device (including air blowing from a blower) (not shown) is introduced into the compressed air of the hood by using a hose. By connecting to the pipe 17, the air curtain 23 is ejected in a horizontal direction from the ejection holes 22 so that the air curtain 23 is formed. In this case, each ejection hole 22 is fixed at a fixed inclination angle θ (1 ° to 15 °). ) Will form a cylindrical swirling flow. The illustrated example is an example in which it is used by attaching it to an airless spray gun coating device.In the case of an air spray gun coating device, the air branched by using a branch pipe to the air introduction pipe on the main body side of the apparatus is used for the hose. In use, it is connected to the introduction pipe 17.

The compressed air is injected so that the coating liquid injected from the injection nozzle body 2 is surrounded from the outer periphery so as to prevent the peripheral from being unexpectedly diffused by the influence of the outside air. Under the influence of the swirling flow energy, the flow of the spray paint involves the mist of the spray paint and the thrust is applied to the spray paint, thereby further improving the adhesion rate. The swirl flow is a right swirl flow,
Although it can be formed in any of the left swirling flow, from the experimental results of the present inventor, it can be formed to be a left swirling flow when viewed from the outlet side of the spray paint, which is more effective in relation to the earth's magnetic field. It has been obtained.

When the compressed air is blown out, the outside air flows into the outside through the outside air inflow hole 13 formed in the inclined wall m, which is injected from the nozzle body 2. In addition to contributing to the miniaturization of the paint spray liquid, the flow velocity can be increased to significantly improve the adhesion of the paint liquid.

The fact that the outlet surface of the compressed air ejection hole 22 is formed in the wart-like projection 23 in the present invention is excellent in preventing eddies from being generated behind the compressed air ejection. And the compressed air outlet 22 and the outside air inlet 13
In the case where the relative position is set so as to be on the same line as the radiation direction, the inflow of outside air is performed in a stronger concentration than in the case where the position is shifted. It is weakly averaged. This is excellent in performing a suitable work corresponding to a change in various coating conditions such as a base coat and a finish coat.

[0014]

As described above, the hood body of the present invention has a structure in which the two members of the inner ring body with the flange and the outer ring body are combined and integrated, and is easy to make and assemble. If several holes and holes with different numbers and arrangements of outside air introduction holes are prepared, it is possible to easily, quickly, economically and inexpensively respond to changes in various coating conditions without changing the flanged inner ring. . Also, maintenance management is extremely easy. It should be noted that in the painting operation, the same excellent effects as described below can be obtained as in the case of the previously proposed one. The air curtain by compressed air surrounds the outer periphery of the spray liquid to be sprayed and makes the paint mist go straight, so that it is not affected by the cross wind (even if there is no wind, the cross wind is generated by the hand movement operation) Become. The outside air flowing from the outside air inflow hole accelerates the speed of the coating mist and improves the adhesion efficiency. When the compressed air jets are formed at a fixed angle, the jetted compressed air forms a spiral air curtain. As a result, the effect of the cross wind can be more effectively prevented. When the wind blows, for example, when there is a wind of about several meters, the spray liquid is greatly diffused to the surroundings to cause environmental pollution, and the paint adhesion rate is reduced to 50% or less. It is surely prevented. The pattern shape of the coated surface has a uniform particle velocity distribution from the center to the edge, so the outline is clear, the film pressure distribution is uniform, and coating spots and sagging phenomena are prevented. Good finish can be obtained. The coating liquid adhesion loss is eliminated, and the coating efficiency and economy are improved at the same time.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a coating gun hood body according to the present invention.

FIG. 2 is a perspective view of the disassembled component.

FIG. 3 is a use state diagram.

FIG. 4 is a view showing a conventional coating gun device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spray gun main body 2 Injection nozzle body 3 Hood 6 Coating liquid 10 Hood body for coating gun 10a Inner ring body with flange 10b Outer ring body 11 Central projection body 12 Inner hole 13 Outside air inflow hole 15 Ring-shaped collar body 16 Compressed air introduction hole 18 Ring ring Body 21 Circular fossa 22 Compressed air outlet 23 Wart m Inclined wall

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[Procedure amendment]

[Submission date] July 23, 1999 (1999.7.2)
3)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (6)

[Claims] 1. An inner hole exit side of a central projection is formed on an inclined wall which expands outward in a mortar shape, and several male threads are engraved on an outer peripheral surface of the central projection. A flanged inner ring body formed by forming a ring-shaped collar body with a constant width in the outer circumferential direction orthogonal to this and having a hole for introducing compressed air formed on the flange body surface; An outer ring in which a female screw to be screwed with an outer male screw of the projection is engraved, an inner surface side is formed in a keyed cavity, and a plurality of compressed air ejection holes are formed in a circumferential direction of the cavity. A hood body for a coating gun, characterized in that it has a configuration in which the body and the body are combined, and is attached to an outer periphery of a nozzle body of an airless spray gun or an air spray gun coating apparatus. 2. An inclined wall of a flanged inner ring body which is formed by expanding an inner hole exit side of a central projection body outward in a mortar-like shape, and a plurality of circumferentially equidistantly spaced positions are provided. The hood body for a coating gun according to claim 1, wherein an outside air inflow hole is formed. 3. A ring-shaped body provided with a compressed air ejection hole, wherein a wart-like projection is provided at a corresponding portion on the outer surface, and each projection serves as an outlet of the compressed air ejection hole. Or a hood body for a coating gun according to 2. 4. The compressed air ejection hole of the outer race is set at 1 ° on the outlet side.
4. The hood body for a coating gun according to claim 1, wherein the hood body has an inclination angle of about 15 [deg.]. 5. The coating according to claim 2, wherein the positional relationship between the compressed air ejection hole in the outer race and the outside air inflow hole in the flanged inner race is arranged on the same radiation. Hood for gun. 6. The coating according to claim 4, wherein the outlet surface of the compressed air ejection hole having an inclination angle of 1 ° to 15 ° is formed on a plane orthogonal to the inclination angle of the ejection hole. Hood for gun.