Fluid sprinkling – spraying – and diffusing – Electrostatic type – Pressurized spray material
Patent
1994-11-15
1997-05-20
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Electrostatic type
Pressurized spray material
239112, 251240, B05B 5025
Patent
active
056305524
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is related to a paint dosage device adapted for mounting in close proximity to a spray gun in a program controlled spray painting installation, for dosed paint supply to the spray gun, in particular in the case the spray gun is provided with high tension electrode for electrical atomizing of the supplied electrically conductive paint.
As dosage means for paint supply to spray guns, cogwheel pumps, dosage by pressurized air or the like are used. Such means often have a narrow regulation range, are highly viscosity dependent and cumbersome to clean when shifting paint color. Furthermore the mounting of such device in close proximity to the spray gun has been difficult, and long connection hoses, possibly subjected to vibration, make accurate and rapid adjustable paint dosage, which at all times is adapted to the program controlled painting process in operation, difficult to achieve. With use of spray gun with high tension atomizing, insulation of the paint dosage of the gun from the remaining part of the painting istallation has been found difficult.
SUMMARY OF THE INVENTION
It is then an object of the present invention to provide a paint dosage device of the type indicated above, and by which the indicated disadvantages of the prior art dosage means are overcome.
The unique inventive feature of this paint dosage device according to the invention is that it comprises at least two dosage cylinders, each having a regulating piston connected to regulation means for setting the paint filling amount of the associated cylinder by controlled adjustment of the departure position of the regulating piston in the cylinder, as well as the dosage rate of the paint supply to the spray gun by program controlling the displacement velocity of the regulating piston in the cylinder, a valve assembly being arranged for connecting the cylinders alternately to the spray gun and putting the cylinder disconnected from the gun in connection with means for cleansing and paint filling.
Such a device is particularly suitable to the purpose in the case the spray gun is provided with high tension electrode for electrostatically charged atomizing of the supplied electrically conductive paint, and the regulating pistons of the cylinders are then according to the invention connected with the regulation means by means of an electrically insulating motion-transferring connection.
The valve assembly comprises preferably four valves in a rectangularly shaped arrangement wherein the valves which are associated with the cylinder outlets and the paint inlet of the spray gun are arranged along the same side while the two sides adjacent to this one side house the valves that connect between the cylinder outlet and the sump of spent cleansing liquid from the cleansing of the cylinders. This arrangement is referred to in the art as a bridge connection. In case the spray gun is furnished with high tension electrode and electrically conductive paint is used, each valve in the valve assembly is made electrically insulating by manufacturing both the stationary valve housing and the moveable valve member in insulating material.
Further, each regulating piston comprises internal flow channels for cleansing the inside of the dosage cylinder by supplying cleansing liquid to and retracting such liquid from the contact surface of the piston against the cylinder wall. These internal flow channels then preferably lead into circumferential grooves in said contact surface of the regulating piston.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be further explained by means of an exemplary embodiment and with reference to the accompanying drawings, on which:
FIG. 1 shows schematically a robot controlled painting installation having a paint dosage device according to the invention for paint supply to a spray gun provided with high tension electrode.
FIG. 2 shows an enlarged section through a dosage cylinder provided with a regulating piston which is furnished with internal cleansing channels.
FIG. 3 s
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patent: 5255856 (1993-10-01), Ishibashi et al.
Anfindsen Ole A.
Sunde Alf
ABB Flexible Automation AS
Morris Lesley D.
LandOfFree
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