JP2008155149A - Cup gun for powder coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cup gun for powder coating which can keep fluidity of a powder coating material A even if slanted and discharge a stable amount of a powder coating material without causing a breathing phenomenon. <P>SOLUTION: A lower part of a coating material cup 12 is tapered to be narrower downward and an intake port for fluidizing air for fluidizing a powder coating material in the coating material cup 12 is formed at the tip end of the tapered shape and a porous pad 15 is set in the intake port to cover the porous pad 15 at the tip end of the tapered coating material cup 12 with the powder coating material even if the gun is slanted. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  In this invention, a paint cup is installed at the bottom of the gun, a suction pipe is inserted into the paint cup, and the powder paint in the paint cup is sucked from the suction pipe by the suction force of the air discharged from the gun. The present invention relates to a powder coating gun with a hand-held paint cup that discharges powder paint together with discharge air.

  Powder coating is expected as an environmentally friendly coating that does not contain organic solvents, as well as aqueous coating.

  By the way, when performing small lot powder coating or creating a powder coating test piece, a normal powder coating apparatus that supplies powder coating from a coating tank to a gun via a powder hose is used. In each small lot color change, it is necessary to frequently perform color change procedures such as cleaning the paint tank, cleaning or replacing the powder hose, and cleaning the gun.

  For this reason, a powder coating gun with a hand-held paint cup with a paint cup attached directly to the bottom of the gun is used for small lot powder coating or when creating a powder coating test piece. Often done. This powder coating gun with a paint cup, that is, a powder coating cup gun, does not have a powder hose and is easy to change colors. Conveniently used when creating pieces.

  As shown in FIG. 4, a conventional powder coating cup gun has a paint cup 2 installed under the gun 1, a suction pipe 3 is inserted into the paint cup 2, and air is discharged into the gun 1 by an injector 4. The powder paint A in the paint cup 2 is sucked from the suction pipe 3 by the suction force of the air discharged from the gun 1, and the powder paint is discharged together with the discharge air from the gun tip.

  The bottom surface of the paint cup 2 is formed by a porous plate 5 in order to take in fluid air that causes the powder paint in the paint cup 2 to flow. The porous plate 5 of the paint cup 2 is installed on the entire flat surface of the lower surface of the body portion of the cylindrical paint cup 2.

  By the way, when a hand-held type powder coating cup gun is used to coat the back surface of an object to be coated, as shown in FIG.

  However, when the gun is inclined, the powder paint A in the paint cup 2 flows as if it were in a water-like state, so that the upper surface of the porous plate 5 on the bottom surface of the paint cup 2 slides and the gun is inclined. When it becomes larger, as shown in FIG. 5, there is a portion where the porous plate 5 is exposed without the powder coating material A at the end portion of the porous plate 5.

  When an exposed portion where the powder coating material A is not placed is formed on a part of the porous plate 5 in this way, air flows without resistance from this portion, and air flows from the portion where the powder coating material A is placed. Since it becomes difficult to flow in, the powder coating A does not flow, and there is a problem that the discharge of the powder coating from the gun causes a breathing phenomenon, the discharge amount becomes unstable, and the coating is squeezed. .

  Accordingly, the present invention is to provide a powder coating cup gun that maintains the fluidity of the powder coating material even when the gun is inclined, does not cause the breathing phenomenon of the powder coating material from the gun, and has a stable discharge rate. It is what.

  In order to solve the above-mentioned problems, the present invention has a paint cup installed in the lower part of the gun, a suction pipe is inserted into the paint cup, and the suction pipe is inserted into the paint cup by the suction force of the air discharged from the gun. In a powder coating cup gun that sucks powder paint and discharges powder paint together with air discharged from the tip of the gun, the lower part of the paint cup is tapered downward, and the tip of the taper shape In addition, an intake port for flowing air for flowing the powder paint in the paint cup was provided, and a porous pad was installed in the intake port.

  As described above, when the lower part of the paint cup is tapered downward, the powder paint collects at the lower part of the paint cup along the tapered shape, so even if the gun is tilted, the tip of the tapered paint cup The porous pad is covered with the powder paint, the porous pad is not exposed, and the powder paint in the paint cup flows by the air flowing in from the porous pad.

  According to the present invention, as described above, even when the gun is tilted, the porous pad installed at the tip of the tapered paint cup into which the flowing air flows is covered with the powder paint. The fluidity of the body paint can be maintained, and a stable discharge amount can be obtained without causing the breathing phenomenon of the powder paint from the gun.

FIG. 1 shows a first embodiment of a powder coating cup gun according to the present invention.
In the powder coating cup gun according to the present invention, as shown in FIG. 1, a paint cup 12 is installed at the lower part of the gun 11, a suction pipe 13 is inserted into the paint cup 12, and the gun 11 is inserted by an injector 14. The structure is such that the discharge air is supplied, the powder paint A in the paint cup 12 is sucked from the suction tube 13 by the suction force of the air discharged from the gun 11, and the powder paint is discharged from the gun tip together with the discharge air. Yes.

  The lower part of the paint cup 12 is formed in a tapered shape downward. At the lower end of the taper-shaped paint cup 12, an intake port for flowing air for allowing the powder paint in the paint cup 12 to flow is provided, and a porous pad 15 is installed at the intake port.

  Since the lower part of the paint cup 12 has a tapered shape, the powder paint A gathers at the lower part of the paint cup 12, and the tip of the suction pipe 13 inserted into the paint cup 12 is the powder paint A at the lower part of the paint cup 12. Located in.

  When the powder paint A in the paint cup 12 is sucked from the suction pipe 13 by the suction force of the air discharged from the gun 11, the air is applied from the porous pad 15 at the lower end of the paint cup 12 according to the suction amount. The powder paint A flows into the cup 12, and the powder paint A below the paint cup 12 flows due to the inflow air. In FIG. 1, the state of the inflow air is indicated by an arrow B, and the flow state of the powder coating material A is indicated by an arrow C.

As described above, natural air may be introduced from the porous pad 15 to cause the powder paint A in the paint cup 12 to flow naturally. For better performance, forced air 16 may be caused to flow from below the porous pad 15 in conjunction with the ON / OFF of the trigger of the gun.
The forced air 16 generally uses compressor compressed air dehumidified and deoiled. For example, in the case of powder coatings that are sensitive to temperature and humidity, or when test pieces are made at a paint manufacturer and the performance test is performed, in order to avoid powder coating containing as much external air as possible, Forced air is preferred.

  Next, the suction action of the powder paint A from the suction pipe 13 is performed by the injector 14 (main air 17) by the venturi effect provided below the grip of the gun 11 by the discharge amount of the powder paint and the carrier air. And the carrier air (sub air 18) provided in the injector 14 or separately. In the embodiment of FIG. 1, the sub air 18 is installed at the gun body inlet so as to enter substantially parallel to the flow of the powder coating material. In this embodiment, in addition to the injector 14, the discharge amount can be set by the air pressure and the amount of the forced air 16 from the porous pad 15. When the pressure and amount in the paint cup 12 are larger than the suction pressure and amount of the injector 14, the inside of the paint cup 12 becomes pressurized (plus pressure), and the discharge amount can be increased. That is, the powder coating material A can be pushed out from the coating material cup 12.

  Further, as shown in FIG. 3, by attaching an air regulating valve 19 for air in / out at the top of the paint cup 12, the adjustment of the discharge amount can finely control the air pressure in the paint cup 12. Therefore, the setting range of the discharge amount becomes easy.

  As another method, it is possible to provide a large discharge amount by increasing the pressure in the paint cup 12 by introducing pressurized air from the air regulating valve 19.

  In the powder coating cup gun according to the present invention, the lower part of the paint cup 12 is tapered, and the porous pad 15 is installed at the tip thereof. Is possible. In addition, since the inside of the paint cup 12 is inclined in a tapered shape, even if the amount of the powder paint is reduced, as shown in FIG. Even in the case of the powder coating A having a large angle of repose, that is, poor fluidity, a stable fluidization phenomenon can be obtained and stable coating can be performed.

It is a partially cutaway side view showing an embodiment of a powder coating cup gun according to the present invention. It is a side view which shows the state which inclined the powder coating cup gun of FIG. It is a partially cutaway side view showing another embodiment of a powder coating cup gun according to the present invention. It is a partially cutaway side view showing a conventional powder coating cup gun. It is a side view which shows the state which inclined the powder coating cup gun of FIG.

Explanation of symbols

11 Gun 12 Paint cup 13 Suction pipe 14 Injector 15 Porous pad 16 Forced air 17 Main air 18 Sub air 19 Air regulating valve

Claims (4)

  Install a paint cup at the bottom of the gun, insert a suction pipe into this paint cup, suck the powder paint in the paint cup from the suction pipe by the suction force of the air discharged from the gun, and discharge air from the tip of the gun In addition, in a powder coating cup gun that discharges powder paint, the lower part of the paint cup is formed in a tapered shape downward, and the flowing air that causes the powder paint in the paint cup to flow at the tapered tip A powder coating cup gun, characterized by the fact that it is provided with an intake port and a porous pad is installed at the intake port.   2. The powder coating cup gun according to claim 1, wherein natural air is allowed to flow into the paint cup from the fluid air intake.   2. The powder coating cup gun according to claim 1, wherein forced air is allowed to flow into the paint cup from the fluid air intake.   The powder coating cup gun according to any one of claims 1 to 3, wherein an adjustment port for adjusting an air pressure in the paint cup is provided in the paint cup.

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