Automatic Metal Spray Machine for Capacitors

The machine is designed for electric arc spraying of Zinc metal layers on the top of capacitor elements wound with metallized film. Due to the metal spray, the capacitor plates (within the element) are short-circuited on each side, hence, the capacitor is made non-inductive. Further, the Zinc deposit serves as a base for connecting the leads. Prior to spraying, the capacitor elements must be assembled into a reel of max. 600mm diameter. The capacitor elements are placed on the net support which rotates during metal spray process. The machine has three electric arc guns mounted on the shaft driven by the servo motor system for moving in radial direction of the rotating net. With three guns, it is possible e.g. to spray the first fine layer of zinc, then the second & third rough layer of zinc building the apt thickness of metal spray. The time interval between the different spraying operations is kept minimum to prevent oxidation and assures perfect cohesion of the layers. The spraying plant design assures a uniform thickness of the metal layer. The machine is controlled by PLC and fully automatic. The only manual job requested are loading capacitor elements, reverse side and unloading.