JP3048747U - Painting gun equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable efficient spray coating by preventing a decrease in adhesion rate due to paint scattering in outdoor coating, and at the same time, to prevent environmental pollution. SOLUTION: A hood which surrounds and is attached to an injection nozzle body is provided with a recessed air reservoir chamber having a fixed volume,
In addition, 4-16 holes having a diameter of 0.5 mmφ to 2.0 mmφ are formed concentrically with respect to approximately the middle or the edge of the inclined wall surface which is expanded in a trumpet shape outward from the edge for the chamber. Compressed air outlets are provided. At this time, the compressed air ejection hole is provided parallel to the axis of the coating tube and at an inclination angle of 1 ° to 5 °, or a plurality of outside air inflow holes are formed around the air chamber.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a coating gun device for spray-coating an object to be coated.

[0002]

[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 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 bolted to the outer periphery thereof. The coating liquid 6 atomized by the operation of the lever 1a on the side of the main body 1 is sprayed onto the workpiece 7 as a thin line.

[0003]

[Problems to be solved by the invention]

 Although the radiation direction of the coating liquid 6 is determined by the hood 3 in the above, it is scattered inadvertently under the influence of the wind, which causes uneven coating and a reduction in coating efficiency. It has become. That is, in outdoor painting in shipyards, etc., the adhesion rate of the paint to the painted surface is 50% or less, which causes not only the problem of uneconomical paint but also the problem of environmental pollution around the factory due to the scattering of the paint. The current countermeasures to solve this problem are to stop the painting work and use a shatterproof net, considering the wind direction. The present invention is to simply solve the above problems.

[0004]

[Means for Solving the Problems]

 According to the present invention, there is provided a recessed air chamber having a constant volume surrounding the injection nozzle body, and is approximately in the middle of a sloped wall which is expanded in a trumpet shape outward from the peripheral edge of the chamber. The end portion is provided with 4 to 16 concentrically formed compressed air ejection holes having a hole diameter of 0.5 mmφ to 2.0 mmφ. At this time, the compressed air ejection hole may be provided in a state parallel to the coating tube axis and at an angle of 1 to 5 degrees with respect to the coating tube axis, or a plurality of compressed air injection holes may be provided around the air reservoir cavity. Perforating the outside air inlet.

[0005]

[Embodiment of the invention]

 FIG. 1 is a partial perspective view of the vicinity of a hood of the coating gun device, and FIG. 2 is a central sectional view. In the drawing, 1b is a paint tube, 2 is a paint spray nozzle body, 3 is a hood, 4 is a spray nozzle body tightening nut, and 5 is a screw bolt, which is the same as that of the conventional device. Has an improved configuration as follows.

In the present invention, a concave cavity 3a having a constant volume is formed around the periphery where the injection nozzle body 2 is located, and the volume of the cavity 3a is appropriately accumulated in the chamber. Is formed, the size of which is approximately 1.5r to 2r of the inner diameter R of the nozzle body outer diameter r, and the depth s is the same as the size of 1.5r to 2r. Done.

Reference numeral 8 denotes four to sixteen concentrically drilled holes (approximately eight in the illustrated example) approximately at the middle or near the edge (near the middle part in the illustrated example) of the inclined wall 3b that is expanded in a trumpet shape. ) Compressed air ejection holes, the diameter of which is 0.5 mmφ to 2.0φ. At this time, the ejection hole may be directly formed in the inclined wall 3b, but a configuration in which the nozzle tip 9 is fitted as in the illustrated example can be adopted.

FIG. 3 is an enlarged partial detailed view of the compressed air injection unit. Reference numeral 10 denotes a casing which is provided so as to surround the rear part of the through hole, which is attached with a screw bolt 11, and which is compressed to the casing 10. An air introduction pipe 12 and an adjustment valve 13 are provided.

In the above embodiment, the compressed air is ejected in the jetting direction of the compressed air jetting hole 8 in the same parallel state as the coating pipe axis p. This is an example in which it is provided in a state of being parallel to the axis p and swinging left and right so as to have an inclination angle θ of 1 ° to 5 ° with respect to the coating pipe axis p. (The example shown is swung to the left.)

Reference numeral 14 denotes a through hole for inflow of outside air formed in the outer peripheral surface of the recessed cavity 3a for storing air, and a plurality of holes are formed preferably in a point or line symmetric relationship.

FIG. 5 is a diagram showing the state of use of the device of the present invention. As shown in the drawing, when the coating liquid 6 is injected from the injection nozzle body 2, compressed air is injected from the injection hole 8 to about the middle of the hood 3, The air curtain 15 is ejected in the horizontal direction from the peripheral portion so that the air curtain 15 is formed. The outer periphery of the coating liquid ejected from the ejection nozzle body 2 is surrounded by the air curtain 15 and unexpectedly reaches the periphery. Avoid spreading.

At this time, a cylindrical swirling flow m is formed in a case where each of the jet holes 8 is formed so as to be parallel to the coating pipe axis p and to have an inclination angle θ of 1 ° to 5 ° with respect to the coating pipe axis p. When the swirling flow m is a left swirling flow viewed from the outlet side of the spray coating, the effect of accelerating the spray paint or increasing the thrust can be achieved. In particular, it was confirmed from the experiment results of the present inventor that, in particular, the one that makes the left swirling flow when viewed from the outlet side of the spray paint is more effective in relation to the global magnetic field.

In addition, in the cavity 3a formed around the outer periphery of the injection nozzle body 2, a negative pressure is generated in the chamber 3a during the injection of the coating liquid from the injection nozzle body 2, and this is generated on the outer circumference. Auxiliary action to force the outside air to flow vigorously from the perforated outside air inflow hole 14 to strongly push out the coating liquid sprayed from the spray nozzle body 2 from back to front, and to promote atomization and diffusion action of the spray coating liquid. Will be performed.

[0014]

[Effect of the invention]

 The present invention is configured as described above, and the coating liquid is not affected or diffused by the outside air by the air curtain formed from the injection hole on the inclined wall of the hood, and the spray coating liquid is applied. On the other hand, further thrust and atomization promotion are added, and very efficient coating work can be achieved. According to the experimental results of the present inventor, it is more than 40% compared to the conventional one. The adhesion rate has been improved, and a quick and beautiful painting operation has been performed.

[Brief description of the drawings]

FIG. 1 is a partial perspective view near a hood of a coating gun device.

FIG. 2 is a central sectional view of FIG.

FIG. 3 is an enlarged partial detailed view of a compressed air injection unit.

FIG. 4 is an explanatory partial sectional view showing another example of the above.

FIG. 5 is a use state diagram.

FIG. 6 is a partially sectional explanatory view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spray gun main body 2 Injection nozzle body 3 Hood 3a Foam chamber 6 Coating liquid 8 Compressed air ejection hole 12 Compressed air introduction pipe 14 Through hole 15 Air curtain

Claims (4)

[Utility model registration claims] 1. A hood, which surrounds and is attached to an injection nozzle body, is provided with a recessed air reservoir cavity having a constant volume,
In addition, 4-16 holes having a diameter of 0.5 mmφ to 2.0 mmφ are formed concentrically with respect to approximately the middle or the edge of the inclined wall surface which is expanded in a trumpet shape outward from the edge for the chamber. A coating gun device provided with a compressed air outlet. 2. Concentrically provided 4 to 16 compressed air outlets are provided in a state parallel to the axis of the coating pipe and at an angle of inclination of 1 ° to 5 ° with respect to the axis of the coating pipe. The coating gun device according to claim 1, wherein 3. The coating gun device according to claim 2, wherein the ejection port of the compressed air is swung leftward at an angle of 1 ° to 5 ° when viewed from the outlet side of the compressed air. 4. A plurality of outside air inflow holes are formed around an air reservoir cavity.
The coating gun device as described.