Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Nozzle cleaner – flusher or drainer
Patent
1998-05-28
1999-04-20
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Nozzle cleaner, flusher or drainer
239223, B05B 1502, F23D 1134
Patent
active
058949933
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a rotary atomizing head assembly particularly suitable for use on a-coating machine with color changing functions
Generally speaking, electrostatic coating machines with a rotary atomizing head assembly are largely constituted by; a coating machine body; a rotational shaft which is axially extended and rotatably supported on the coating machine body; an air motor which is mounted on the coating machine body for driving the rotational shaft; a rotary atomizing head assembly which is mounted in a fore distal end portion of the rotational shaft and driven from the air motor for rotation on the front side of the coating machine body; and a feed nozzle which is received in the rotational shaft with its fore end portion extended into the rotary atomizing head assembly The feed nozzle which serves for spurting a paint or a thinner as a washing solvent into the rotary atomizing head assembly, is connected to a color changing valve device and a thinner source through pipings.
The rotary atomizing head assembly is formed in a bell- or cup-like shape, including; a bell cup providing a paint spreading surface for spreading a paint into a-thin filmy form and a paint receiving surface in fore and rear portions of its inner peripheral surface, respectively; a hub member mounted on the inner peripheral side of the bell cup between the paint spreading surface and the paint receiving surface; a paint reservoir formed between the rear surface of the hub member and the paint receiving surface of the bell cup for temporarily holding a paint or solvent which is supplied to the paint receiving surface from a feed nozzle provided on the coating machine body; and a plural number of paint outlet holes provided in the hub member, for letting the paint or solvent in the paint reservoir flow out therethrough onto the paint spreading surface of the bell cup.
In a paint coating operation by a prior art electrostatic coating machine of this sort, compressed air is supplied to the air motor in the first place to put the rotational shaft and rotary atomizing head assembly in high speed rotation. Thereafter, a paint is spurted into the rotary atomizing head assembly through the feed nozzle, whereupon the supplied paint is spread into a thin filmy form on the paint forming surface on the inner peripheral side of the bell cup and then released in the form of charged particles from at marginal edge of the rotary atomizing head assembly. At this time, the charged paint particles, which are released from the rotary atomizing head assembly, are urged to fly toward and deposit on a coating object, by traveling along lines of electric force in electrostatic field which is formed between the electrostatic coating machine and the coating object.
During a paint coating operation by an electrostatic coating machine as described above, paint inevitably deposits on the paint spreading surface as well as on the paint receiving surface of the bell cup. In order to wash paint deposits off the paint spreading surface, it is the usual practice to spurt a thinner onto the bell cup through a feed nozzle while keeping the rotational shaft and the rotary atomizing head assembly in rotation by the air motor. Consequently, the thinner is spread over inner peripheral surface of the bell cup and urged to flow toward the paint releasing edge through the paint spreading surface, washing away paint deposits therefrom
With a prior art electrostatic coating machine of this type, paint particles which are released from the paint releasing edge at the fore end of a bell cup are mostly put on a flight toward a coating object along lines of electric force to deposit on the coating object However, it is often the case that part of released paint particles tend to flow in a reverse direction toward the outer peripheral side of the bell cup and deposit on outer peripheral surface of the bell cup.
Namely, when the rotary atomizing head assembly is put in high speed rotation, it is known in the art that inverse air flows are induced by th
REFERENCES:
patent: 5078321 (1992-01-01), Davis et al.
patent: 5106025 (1992-04-01), Giroux et al.
patent: 5163625 (1992-11-01), Takayama et al.
patent: 5765762 (1998-06-01), Lee et al.
patent: 5775598 (1998-07-01), Takayama et al.
Ikeda Shogo
Kon Masatoshi
Takayama Shinichi
ABB Industry K.K.
Bocanegra Jorge S.
Kashnikow Andres
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