Fluid sprinkling – spraying – and diffusing – Electrostatic type – With cyclical movable support
Patent
1995-09-28
1998-06-30
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Electrostatic type
With cyclical movable support
239708, 239112, 239750, 118302, 118322, B05B 500
Patent
active
057721254
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a machine for spraying a coating material electrostatically onto objects such as automotive vehicle bodies.
On a production line, the bodies are displaced by a conveyor and the installation for spraying the coating material comprises in general several machines called "lateral machines" intended to coat the sides of the bodies and a machine called a "roof machine" comprising a horizontal beam perpendicular to the path of travel of the bodies and intended to coat the horizontal surfaces such as the hood, the roof and the trunk lid of the bodies. Each lateral machine carries an automatic sprayer of the pneumatic or rotary type and the roof machine carries in general three sprayers of the same type.
The complexity of operating these machines resides principally in the feeding of a coating material to the sprayers while they are susceptible to large amplitude movements. Long tubing must be provided.
In the patent FR 2 609 252, the Applicant proposed a machine for spraying a coating material constituted by a multiaxis robot carrying a supply tank and an associated sprayer. During the spraying phases, the supply tank is uniquely in communication with the associated sprayer. When it is necessary to clean and fill the supply tank, the multiaxis robot approaches a stationary installation situated in the booth and connects the reservoir to appropriate fluid circulation circuits, with the aid of rapid connection means.
This installation has advantages but it is not always possible to utilize multiaxis robots, i.e. an elaborate and costly system in comparison with the "lateral machines" and "roof machines" most often utilized. In addition, the time available for carrying out the cleaning and filling operations is very short, less than 10 seconds on an automotive vehicle production line. Consequently, the time allowed for the robot to reach the cleaning-filling station is lost for other operations. The invention aims at resolving these problems.
BRIEF SUMMARY OF THE INVENTION
It concerns a machine for spraying a coating material, of the type supporting at least one sprayer and an on-board supply tank in proximity to said sprayer, characterized that it also supports a coating material changing assembly on board a mobile subassembly of said machine also supporting said sprayer and said supply tank.
What is meant by "coating material changing assembly" is a unit known per se which permits cleaning and filling the on-board supply tank with a predetermined color. This unit thus comprises gates connected to supply tubes for the coating material, to a solvent supply tube and to an air supply tube.
This construction thus permits retention of the advantages of the system described in the patent FR 2 609 252, while limiting the dead time since it is no longer necessary to displace, over a certain distance, the supply tank toward the coating material changing assembly. This latter is supported by the machine in proximity to the supply tank, whether it acts as a "lateral machine", a "roof machine" or even a multiaxis robot. The quantities of coating material engaged downstream of the coating material changing assembly are optimized. In effect, at each filling operation, the supply tank receives only the quantity necessary for coating an object and the volume of lost coating material at each change of color is thus minimized.
According to a variation of the invention, the coating product changing assembly is movable between a position where it is connected to the supply tank and a position where it is isolated. This configuration is particularly adequate in the case of the use of conductive coating materials such as water soluble paints. In effect, with such paints, if one wishes to spray electrostatically, it is imperative to isolate the sprayer placed at a high voltage from the coating product feeding circuits at ground potential. The connection between the supply tank and the coating material changing assembly permits such an isolation. It is sufficient to provide a sufficie
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Ehinger Pierre
Merabot Djamel
Douglas Lisa Ann
Kashnikow Andres
Sames S.A.
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