Abstract:
A device for dispensing coating material includes at least two electrodes (22) for coupling to at least one high-magnitude potential supply (24) so that the at least two electrodes (22) are maintained substantially at two different high-magnitude potentials so that an electric field exists between the at least two electrodes (22). At least one of the at least two electrodes • (22) includes a passageway extending therethrough to provide a flow of compressed gas through the at least one of the at least two electrodes (22).
Abstract:
A nozzle device (10) for forming a composite fluid generally includes a nozzle portion (12) connected to a main body (14). The main body (14) includes an inner axial bore (20), an annular wall (28) and an annulus (36). The annulus (36) and annular wall (28) define an annular chamber (38). A portal (40) fluidly communicates the bore (20) with the annular chamber (38). The nozzle portion (12) includes a converging nose section (52) having an internal axial bore (58). An annular collar (50) extends from the nose section (52) and disposes at least partially within the annular chamber (38). A first tube (70) for transporting a first fluid (74) disposes within axial bore (20) and axial bore (58) A second tube (72) for transporting a second fluid (80) disposes only within bore (20), terminating proximate the portal (40). A propellant fluid (78) introduced under pressure into the bore (20) directs the second fluid (80) into the annular chamber (38) through the portal (40). The propellant fluid (78) and the second fluid (80) pass about the annular collar (50) and travel along the converging nose section (52) toward the exit port (56). The propellant fluid (78) and the second fluid (80) admix with the first fluid (74) exiting the first tube (70) and exit port (56) to form the composite fluid (76) outside the nozzle (10).
Abstract:
A spray gun for powder electrostatic coating in which the pattern width can be regulated easily, a spray pattern having an appropriate spray speed and an appropriate spread is formed, a high charging effect is imparted to the particles by a charging electrode, and the coating efficiency is enhanced. Regulation air openings (31) for jetting compressed air toward a central spray flow are provided on both sides of a jet opening (22), and the pattern width can be regulated by regulating the flow rate of the compressed air. The jet opening (22) is provided with auxiliary air openings (23) for jetting compressed air along a powder spray flow arranged around a central opening (21) for jetting powder. The spray gun can be adapted to the shape and portion of the object to be coated under an optimal condition by imparting a straight drive force to the spray flow by the compressed air from the auxiliary air openings (23). Furthermore, a charging electrode (9) is arranged at the center of the jet opening (22), and the distal end of the electrode is located at or just before the colliding/scattering position of the jet air.
Abstract:
A material supply for a material application system such as a powder coating application system includes a feed hopper in the form of a duct. The duct is connectable to negative pressure during a color change process and is disconnected from the negative pressure during a spray application process. The negative pressure can be provided from a powder overspray recovery system such as an after filter blower. Dampers are provided to control air flow through the hopper duct and to allow the duct to be at ambient pressure during a supply mode of operation. The hopper duct also includes a suction interface for pumps, in the form of a siphon ring, as well as a fluidizing function. A removable sieve is provided with an optional vibration feature. Powder may be added to the duct via an access door or transfer pumps for new powder and/or reclaimed powder overspray.
Abstract:
The invention relates to a device for applying an atomizable material to a workpiece (12, 112), comprising: a feed for supplying an air stream that is charged with atomized material particles; an ionization device, which electrically charges the material particles and which comprises a conduit pipe (1, 101, 201) for conducting the air stream that is charged with material particles; a high-voltage electrode (6, 106, 206); a ground electrode (4, 104, 204) that is located upstream in relation to the direction of flow of the air stream that is charged with the material particles; and a delivery unit (3, 113) for delivering the electrically charged material particles in the direction of the grounded workpiece. The inventive device is characterized in that the ground electrode (4, 104, 204) is configured as an annular electrode, which at least partially surrounds the air stream that is charged with the material particles.
Abstract:
A powder spraying gun generates a desired pattern of electrostatically charged particles for coating a workpiece without rotating parts or particle deflectors. The powder pattern is generated with a funnel-shaped output in conjunction with air introduced into a powder charging chamer of the gun in a tangential swirling motion. The swirling air is additionally used to purge agglomerated powder particles from the charging electrodes in the charging chamber. The charging chamber surface is fashioned from material exhibiting low friction or high resistance to powder impact fusion.
Abstract:
Die Erfindung betrifft ein Verfahren zum Beschichten eines Werkstücks (26) mit einem pulverförmigen Beschichtungsmaterial, bei welchem das Beschichtungsmaterial durch einen ersten Luftstrom einer Ionisiervorrichtung (3) zugeführt wird, das Beschichtungsmaterial in der Ionisiervorrichtung (3) elektrostatisch aufgeladen wird und zusammen mit dem das Beschichtungsmaterial tragenden Luftstrom einen Materialluftstrom bildet, der durch wenigstens eine Austrittsöffnung (7) einer Pulverdüse (1), insbesondere in Richtung des elektrisch geerdeten Werkstücks (26), abgegeben wird. Das Verfahren wird dadurch weitergebildet, dass der aus der Austrittsöffnung (7) tretende Materialluftstrom durch einen weiteren Mantelluftstrom zumindest teilweise umschlossen wird. Ferner betrifft die Erfindung eine Pulverdüse (1) zum Beschichten eines Werkstücks (26) mit einem pulverförmigen Beschichtungsmaterial mit einer Eintrittsöffnung (2) zur Zufuhr eines ersten, das Beschichtungsmaterial tragenden Materialluftstrom und mit mindestens einer Austrittsöffnung (7) zur Abgabe des Materialluftstroms, insbesondere in Richtung des elektrisch geerdeten Werkstücks (26), sowie eine Beschichtungskabine (20) zum Beschichten eines Werkstücks (26) mit einem pulverförmigen Beschichtungsmaterial.
Abstract:
A gun mount for a spray gun includes a rigid bracket (100) that is installed on a rigid vertical support such as a gun mover. The bracket (100) securely mounts the guns (18) so as to reduce vibration and swaying during a spraying operation, even when the guns (18) are being vertically moved by an oscillator. A position label or other suitable indicia is provided on the bracket (100) so that the gun mount position can be recorded and thereby accurately repeated during subsequent installations. The bracket (100) in one embodiment includes a series of vertical and horizontal mounting holes (112) that permit a gun (18) body to be installed at a desired vertical and horizontal orientation. A gun blow off arrangement is also provided for mounting associated pairs of air nozzles in position to blow powder from gun exterior surfaces. The associated pairs of air nozzles are mounted on a common bracket that can be selectively and slideably positioned on a channel support. An air nozzle positioning indicating device is provided to accurate position and record the position of the air nozzles for particular gun positions.
Abstract:
A plurality of unconventional negative tribo-charging materials are described for use as the powder contact surfaces in tribocharging and corona powder spray guns, gun components, and powder delivery system components. The invention also provides a short barrel tribo-charging powder spray gun having an interchangeable powder contact inser and nozzle, with turbulence inducing air jets. The invention further provides novel tribocharging and corona gun designs. Improved powder coating systems are made possible wherein, for example, negative tribo guns can be utilized with negative corona guns to coat different parts of the same workpiece in a powder coating system. Also provided is an inside-out configuration in which pressurized air directs powder coating material outward towards a charging surface. Additional configurations provide air jet induced tribocharging and conventional tribocharging portions combined in a single gun.