Improved powder spray booth and powder recovery system

摘要

A spray booth is disclosed for applying powder coating to substrates. There is a self contained recovery/filter system associated with the booth, which recovery/filter system is so constructed that there are no restrictions in the air flow passages between the booth and the recovery/filter system, with the result that there are no confined areas wherein fires may cause explosions. Powder is collected in air slides located in the bottom of the recovery/filter system. The air slides transfer the collected powder via a sloping fluidized bed to air transfer pumps which are operative to convey the collected powder back to a recycle system. In order to expose a maximum surface area of a complex shaped workpiece to powder coverage with a minimum number of spray guns, the workpieces are rotated during the course of passage through the booth. Rotation of the workpiece is effected by supporting the workpieces upon the top of rotatable conveyorized shafts which extend upwardly through seals located in the floor of the booth.