Abstract:
The present invention is directed to an electrostatic powder coating apparatus comprising a spray gun (101) and a powder supply unit (100), said apparatus being adapted to form a coating film by spraying electrostatically charged powder toward the surface of an electrically grounded product to be coated, wherein a nozzle tip of said spray gun (101) includes powder adhesion preventing means.
Abstract:
Sprühvorrichtung und Sprühverfahren zum Beschichten von Gegenständen mit Beschichtungsmaterial, insbesondere mit Beschichtungspulver. Es wird nur eine einzige Hochspannungs-Elektrode (26) auf nur einer Seite des Beschichtungsmaterialstromes verwendet, um das Beschichtungsmaterial elektrisch aufzuladen. Dadurch wird ein besserer Wirkungsgrad (weniger Verlust an versprühtem Pulver) erreicht als mit beidseitig des Beschichtungsmaterialstromes angeordneten Elektroden.
Abstract:
A mounting assembly for adjustably mounting a spray gun onto a mounting bar comprises a ball-and-socket joint attached at one end to the bar and attached at the other end to the gun, and an adjustment sleeve extending along the exterior of the bar. The sleeve is attached to the ball-and-socket joint and adapted to tighten the socket around the ball when the sleeve is turned to retain the gun securely in a desired position with respect to the bar. The mounting assembly allows for positioning the spray gun in an almost limitless range of possible orientations, and allows the securing mechanism to be easily tightened and loosened by the operator by turning the adjustment sleeve. An anti-back-ionization probe is attached to the gun and extends externally to the gun along the top or side of the gun. The probe comprising an elongated rod, which is easily removable and easily adjustable in length.
Abstract:
Apparatus for mounting and moving coating dispensers within the interior of a spray booth, and particularly the coating dispensers located above an object moving through the booth. A first embodiment comprises a dispenser housing having an aerodynamically shaped outer surface formed with a leading edge, a trailing edge and opposed generally curved sides. A second embodiment includes a dispenser housing an outer surface with a convexly curved leading edge, flat side walls and a flat bottom wall. A pair of support assemblies isolated from the booth interior mount the dispenser housings within the booth interior such that the leading edge of each dispenser housing faces the top of the spray booth and the trailing edge faces the objects moving through the booth. One or more coating dispensers are mounted at the trailing edge of the dispenser housings in a position to discharge coating material downwardly onto the object. Each support assembly carries one side of a dispenser housing and structure is provided for moving the dispenser housings and dispensers vertically, and the dispenser housings side-to-side and pivotally with respect to objects moving through the booth. A collision detector is also provided to shut the system down in the event of a collision between the apparatus and an object within the booth.
Abstract:
Means for pulverizing and dispersing the aggregated powder and powder adhesion preventing means are provided in a nozzle tip of a spray gun (101) of an electrostatic powder coating apparatus. Temperature/humidity control means (13) for adjusting a temperature and humidity of compressed air (A) supplied to an air chamber (1b) of a powder supply unit (100) is also provided.
Abstract:
Die Erfindung bezieht sich auf ein Verfahren und eine Einrichtung zum Pulversprühen, beispielsweise anwendbar zur elektrostatischen Lackierung. Mit dem Ziel eine gut regelbare hohe Pulverausstoßrate zu erreichen, wird vorgeschlagen, Pulver (8) in einem geschlossenen Behälter (2) zu fluidisieren, im Fluidbettbereich zu entnehmen und durch eine Düse (11) am Behälter (2) austreten zu lassen. Der Behälter (2) ist durch eine Fritte (6) unterteilt in eine erste Kammer (3), der Luft (7) zugeführt wird, und eine zweite Kammer (4), die das Pulver (8) enthält und aus der über ein Ventil (19) Luft abgeführt wird. Die Pulverausstoßrate läßt sich über die Regelung von Luftdrücken (p 1 und p 4 ) regeln.
Abstract:
Methods and apparatus are disclosed for spraying powder into the interior of welded hollow can bodies from a spray gun mounted to the welding arm of a can forming machine. The spray gun can either apply a stripe of highly charged powder on the welded seam areas of hollow can bodies, or can simultaneously apply a coating of powder having a first thickness on the longitudinally welded seam areas and a second thickness less than the first thickness on the remainder of the interior surface. Air is vented off from the powder flow being transported through the welding arm so that the powder to air ratio is increased. Air is introduced at the downstream end of the welding arm to provide a suction force to help draw the powder flow through the welding arm and to increase the velocity of the powder flow for better tribo charging of the powder in the gun and to improve spray pattern stability. A flow of cleaning air through the powder spray gun prevents powder from collecting on the front surface of an offset nozzle secured to the spray gun. The gun assembly is affectively grounded to prevent arcing, and has an exterior shape which has been geometrically configured to improve powder coating of the can.
Abstract:
Apparatus and methods for pumping a uniform flow of air entrained powder at low flow settings to a diffuser of an electrostatic spray gun which disperses the powder and cools the spray gun. A single or double stage pump with a bleed port design draws powder into the pump from a powder container when compressed air directed into the pump is above a predetermined pressure. In another embodiment, a pump delivers a constant velocity of air entrained powder to the spray gun.
Abstract:
An apparatus for mounting and moving coating dispensers (36) within the interior of a spray booth (10) and particularly the coating dispensers (36) located above an object (30) moving through the booth (10), comprises a dispenser housing (38,38A) having an aerodynamically shaped outer surface (58) formed with a leading edge (60), a trailing edge (62) and opposed generally curved sides (64,66). A pair of support assemblies (40,42) isolated from the booth interior (24) mount the dispenser housing (38,38A) in the path of a downward flow of air within the booth interior (24) within which oversprayed coating material is entrained for collection such that the leading edge (60) of the dispenser housing (38,38A) faces the top or ceiling (12) of the spray booth (10) and its trailing edge (62) faces the objects (30) moving through the booth (10). One or more coating dispensers (36) are mounted at the trailing edge (62) of the dispenser housing (38,38A) in a position to discharge powder coating material downwardly onto the object (30), such as the hood, roof (32) and trunk (34) of a vehicle body (30). Each support assembly (40,42) carries one side of the dispenser housing (38,38A) and structure is provided on at least one of the support assemblies (40,42) for moving the dispenser housing (38,38A) vertically, side-to-side and pivotally with respect to objects (30) moving through the booth (10).
Abstract:
An apparatus (10) for spraying powder coating material includes a rotatable turret (14) which moves articles (12) to and from a work station (16). A powder spray gun (18) is operable to spray an annular pattern onto each of the articles (12) in turn while the article (12) is at the work station (16). The powder flows through the spray gun (18) as a series of pulses. An excess powder collector draws a flow of powder away from the work station (16). The powder spray gun (18) is mounted on a three axis adjustment assembly to enable the powder spray gun nozzle (52) to be accurately positioned relative to an article (12) at the work station (16).