Patent ID: 8430640
Filing Date: 2013-04-30
Classification: B05B

Abstract:
1. A powder feed apparatus for a powder spraycoating equipment, said powder feed apparatus comprising: a dense phase powder pump including at least one feed chamber for discharging coating powder, a powder intake valve at a powder intake of said at least one feed chamber to aspirate the coating powder during a suction stage; a powder outlet valve at a powder outlet of said at least one feed chamber to discharge the coating powder during a discharge stage; control valves configured to operate the dense phase powder pump; and an electric control unit including at least one computer configured to drive the dense phase power pump by the control valves, and a powder adjusting element configured to control a rate of a powder stream to be moved by the dense phase powder pump, wherein the control unit stores a function t wherein the powder adjusting element has an adjustment range of 0 to 100%, said adjustment range being divided into corresponding 0 to 100% portions of a powder discharge rate of conveyed discharged powder of the dense phase powder pump, where wherein the control unit is configured to control the open time of the powder intake valve as the calculated t