Abstract:
Electrostatic liquid spray coating apparatus in- cluding a frusto-conical rotary atomizing cup of insulative material driven by an air turbine, is provided with a ring-shaped semiconductive charging electrode embedded in the inner surface thereof for contact charging liquid coating material supplied to the rear of the cup as it flows forwardly and outwardly over the rotating cup interior and contacts the electrode prior to atomization at the forward edge of the cup. A generally cylindrical insulative support oody, housing a turbine and its associated air bearing and cup drive shaft, has a reduced diameter intermediate section which provides an annular cavity in which are located liquid coating and solvent valves for controlling the flow of liquid coating and solvent to the cup. The support body is mounted to a rear bracket by several parallel spaced apart insulative columns, one of which is hollow to accommodate a high voltage insulated cable for energizing the charging electrode in the cup via a stationary conductor which terminates in closely spaced proximity to a semiconductive ring on the cup exterior which is electrically connected to the ring-shaped charging electrode on the cup interior via a series of semiconductive pins extending through the wall of the cup between the ring-shaped conductor and charging electrode. A dump valve is mounted on the bracket between the columns. Secured to the forward portion of the support body of an alternate embodiment is a cap having a generally convex contoured outer face into which the rotary atomizer cup is at least partially recessed. The aerodynamic shape of the contour helps to avoid eddys which would tend to draw the spray pattern back toward the apparatus. A ring of jets surrounding the cup provide a projecting and shaping air flow while a repulsion ring embedded in the contoured face helps to further avoid buildup of coating material on the apparatus.
Abstract:
A rapidly cleanable rotary atomizer is characterized by a passageway extending between a rearward coating material cup of the atomizer and a forward coating material feed surface, from an edge of which atomization occurs. The passageway initiates in the material cup at a non-zero radius from the atomizer axis and terminates on the material feed surface at the axis. During changes of coating material, the passageway enables flushing media to be introduced from the material cup onto the material feed surface immediately at the axis of rotation of the atomizer for quickly and thoroughly cleaning the entirety of the material feed surface.
Abstract:
Eine elektrostatische Sprühvorrichtung zum Aufbrin gen eines flüssigen Überzugsmaterials auf ein Werkstück, mit einem rotierenden, glocken- oder scheibenartigen Zer stäuberkopf und einem zum Zerstäuberkopf koaxialen, an eine Druckluftquelle angeschlossenen Ringspalt wird derart weiter ausgebildet, daß ein weiterer an eine Druckluftquelle angeschlossener Ringspalt vorgesehen ist, der als äußerer Ringspalt den ersten, inneren Ringspalt koaxial umgibt, und daß die Spaltbreite zumindest des einen der beiden Ring spalte verstellbar ist.
Abstract:
A rotaty type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a singlethrust magnetic bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.
Abstract:
A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a singlethrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft. Each of the radial air bearings comprises a plurality of pads cooperating with the rotary shaft, and a bearing support frame supporting the pads via support pins. The bearing support frame is mounted on the outer wall of the housing via 0 rings. The bearing support frame and the housing are interconnected to each other by a bolt for preventing relative rotation therebetween.
Abstract:
A method of painting an automobile body 20 utilises a robot painting system 10 for electrostatically painting the automobile body, the system including a paint module 12 adapted to maintain the automobile body in a stationary position relative to at least two painting robots 26 to 30, each of which carries a rotary bell-type atomizing device 74 and provides programmed movement thereof about five control axes 46, 50, 54, 58, 61 at a speed which prevents the cone-shaped pattern 84 of atomized paint particles from being distorted due to any gyroscopic effect developed by the atomizing device as it is moved about the control axes.
Abstract:
A sprayer, particularly for hand-held or vehicle-borne agricultural use, has a rotatable sprayhead having a liquid dispersing surface in the form of disc, dish or cup, a rotatable electrode spaced from the outer edge of said surface by a gap, means for supplying liquid to the liquid dispersing surface, connections for the poles of a source of electrostatic potential to apply one pole of the source to the electrode and to apply the other pole of the source to at least the outer edge of the surface to apply the potential of the source across the gap, and means to rotate the surface and the electrode to disperse liquid supplied to the surface as a charged spray. The potential may be applied to the outer edge via the liquid if conductive or via a suitable conductive path in the sprayhead.