Fluid sprinkling – spraying – and diffusing – Electrostatic type – With impeller
Patent
1996-12-03
1998-07-07
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Electrostatic type
With impeller
239707, B05B 1700
Patent
active
057755981
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a rotary atomizing head type coating machine with an indirect charging system, which is particularly suitable for use with low resistance paints such as water-base paints and metallic paints.
2. Discussion of the Background
Generally, in a rotary atomizing head type coating machine, while a rotary atomizing head is put in high speed rotation, a high voltage is applied across the atomizing head and an object to be coated, and a paint is supplied to the rotary atomizing head to undergo atomization and charging there. Atomized and charged paint particles are caused to fly along an electrostatic field toward a coating object, which is located axially forward of the atomizing head, and deposit on the coating object.
In this regard, illustrated in FIG. 11 is a prior art rotary atomizing head type coating machine employing an indirect charging system.
In that figure, indicated at 1 is a coating machine body which is mounted on a reciprocator (not shown). Provided internally of the coating machine body 1 is an air motor 2 of metallic material consisting of an air bearing 2A and a drive section 2B, along with valve devices (not shown) including a paint valve and a dump valve. Circumferentially, the coating machine body 1 is enshrouded under a synthetic resin cover 3. The air motor 2 is grounded through a cable 2C. The above-mentioned synthetic resin cover 3 is formed of an insulating synthetic resin material such as polyethylene terephthalate (PET), polyacetal (POM), polyamide (PA), polyethylene (PE), polypropyrene (PP) or the like.
Indicated at 4 is a rotational shaft of metallic material, which is rotatably supported in the air bearing 2A of the air motor 2. The fore end of the rotational shaft 4 is projected out of the coating machine body 1, while its base end is coupled with the drive section 2B of the air motor 2, thereby driving for high speed rotation.
Denoted at 5 is a bell type rotary atomizing head of metallic material which is provided at the fore end of the rotational shaft 4, the rotary atomizing head 5 having a cup-shaped circumferential surface 5A, an inner paint smoothing surface 5B and a paint releasing edge 5C.
Indicated at 6 is a center feed type paint supply pipe which is passed internally of the rotational shaft 4, the paint supply pipe 6 having its fore end extended into the rotary atomizing head 5 and connected at its base end to a paint valve which is in communication with a paint tank through a paint pipe (both not shown).
The reference numeral 7 indicates a shaping air ring which is threaded on a fore end portion of the synthetic resin cover 3 on the front side of the coating machine body 1. This shaping air ring 7 is located at the fore end of the coating machine body 1 in a position on the rear side of the rotary atomizing head 5 in such a way as to circumvent the circumferential surfaces 5A of the atomizing head 5.
In this instance, the shaping air ring 7 is constituted by an inner ring 8 which is formed of an insulating synthetic resin material, and an outer ring 9 likewise of an insulating synthetic resin material which is positioned around the outer periphery of the inner ring 8. Formed between the inner and outer rings is an air outlet 10 in the form of an annular gap through which shaping air is spurted out as indicated by arrow A to generate air flows. By attaching the outer ring 9 to the synthetic resin cover 3, the inner ring 8 can be fixed in position and electrically in contact with the air motor 2. For example, the inner ring 8 and outer ring 9 are formed of insulating synthetic resin material such as polyether sulfone (PES), polyphenylene sulfide (PPS), polyether imide (PEI), polyether ether ketone (PEEK) or the like.
Indicated at 11 are six external electrodes (only two electrodes are shown in the drawings) which are located in equidistant spaced positions, radially outward of the synthetic resin cover 3 and rearward of the paint releasing edges 5C of the rotary atomizing head 5. These externa
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Katsunuma Takehito
Takayama Shinichi
ABB Industry K.K.
Ganey Steven J.
Kashnikow Andres
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