JPS6133630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray gun for powder coating.

Generally, a powder coating spray gun is provided with a buffle in front of the opening of the ejection port to disperse the ejected powder airflow and adjust the ejection pattern.

However, the ejected powder paint particles adhere to the front surface and the collision surface of the baffle, and the amount of adhered powder increases and accumulates over time. The accumulated powder paint particles are separated from the baffle by vibrations and ejected powder air flow during the painting operation, and adhere to the surface of the object to be painted, causing an adverse effect called spitting on the painted surface.

In addition, in the conventional buttful method, the jetting pattern was adjusted by sliding the buttfull position or changing the buttfull diameter, but the pattern had to be adjusted every time the object to be coated changed. This was a hassle and reduced work efficiency.

The present invention has been made in view of the above circumstances.
That is, the present invention provides a spray gun for powder coating in which compressed air for preventing adhesion is ejected toward the periphery of the baffle so that powder paint particles do not adhere to and accumulate on the baffle, and the compressed air The structure is such that the amount of water can be adjusted, and at the same time, the jetting pattern can also be adjusted.

Hereinafter, the present invention will be explained with reference to drawings of embodiments.

In FIG. 1, reference numeral 1 denotes a streamlined baffle installed in the center of the powder passage 4 of the muzzle part 3 disposed at the tip of the spray gun body 2, and an air passage is provided in the center of the wide-divergent front surface 1a of the buffful 1. A spit prevention nozzle 6 connected to the baffle 1 is attached, and the spout 7 of the nozzle 6 is directed in the circumferential direction of the baffle 1.

Next, to explain this effect, first, the muzzle portion 3
Powder particles force-fed through the powder passage 4 are dispersed along the streamline section 1b of the buttful 1 from the powder spout 8, and the dispersed powder particles advance toward the object to be coated. , some of the powder particles try to turn into a vortex and go around the wide-diverging front part 1a of the Batsuful 1,
Compressed air is ejected toward the periphery of the baffle 1 from the jet port 7 of the nozzle 6 disposed in the center of the wide front face 1a, so that the flow of powder is changed to an outward flow, and the flow of the powder is changed to an outward flow. This can prevent powder particles from adhering to the surface.

FIG. 2 shows another embodiment of the baffle part. In this case, the spit prevention nozzle 6 disposed in the center of the buffle 1 has a conical part 6a at its base, and a slit 9 along the conical part 6a is inserted between the baffle 1. The jetting direction of the compressed air is controlled by the contact flange portion 6b which is interposed between the baffle 1 and disposed in front of the diverging front surface 1a of the buffful 1.
The base end of the slit 9 is connected to the air passage 5. Further, a flap opening 10 is provided at the center of the spit prevention nozzle 6 to blow out compressed air to open the pattern, and the base end of the flap opening 10 communicates with the air passage 5.

Further, an inclined slit 11 is bored at the base of the streamlined portion 1b of the baffle 1 to communicate with the air passage 5,
Compressed air is blown out from the slit 11.

In this case, when the powder particles are ejected from the powder ejection port 8, they are accelerated by the compressed air ejected from the slit 11 and flow toward the front of the baffle 1 along the streamline section 1b. In this case, the adhesion of powder particles to the front surface of the baffle 1 is similarly prevented by jetting out compressed air from the slit 9 in the nozzle 6 disposed at the center of the buffle 1.

Furthermore, by changing the pressure of the compressed air introduced into the air passage 5 or changing the width of the slit 9 to adjust the compressed air force, the size of the donut-shaped spray pattern can be adjusted. It is possible.

As described above, by providing the spit prevention nozzle in the center of the baffle with a slit that opens toward the periphery, it is possible to wipe out the adhesion and accumulation of powder particles on the front surface of the baffle, and in turn, to prevent the particles from being deposited on the object to be coated. There is no risk of spitting on the surface, and the pattern can be adjusted freely by adjusting the amount of compressed air ejected, and the coating conditions can be selected to suit the size and shape of the object to be coated. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view of a main part, and FIG. 2 is a longitudinal sectional side view of another embodiment of the baffle portion. 1...Batsuful, 2...Spray gun body, 3
...muzzle part, 4 ... powder passage, 5 ... air passage, 6 ... spitting prevention nozzle, 7 ... spout,
8...Powder spout, 9...Slit, 10...Rump opening, 11...Slit.

Claims (1)

[Scope of Claims] 1. In a powder coating spray gun in which a buttful is provided in front of the opening of the powder spout, the spout opening toward the periphery of the buttful is provided in a circumferential manner, and A powder coating spray gun configured to blow out compressed air. 2. The spray gun for powder coating according to claim 1, wherein the spout has a circumferential slit. 3. The spray gun for powder coating according to claim 1, wherein the amount of compressed air ejected from the ejection port can be adjusted.