POWDER COATING DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent well in advance a coating applied on a work from qualitatively deteriorating by providing a monitoring means which issues a signal when the level of a fluidized powder decreases below a previously set desired value or a complete extinguishment occurs in the powder feed line of a coating unit. SOLUTION: The coating device equipped with spray guns arranged perpendicularly in the lifting direction causes each of the spray guns 24 to jet powder all at once to form a coating on a work while the work is moved through a coating cabin. In this case, part of a powder feed line 30 to be connected to each of the spray guns 24, is formed as a metallic sleeve made up of a material which generates tribovoltage or frictional voltage as soon as a powder particle is conveyed through the line 30. Further, the generated tribovoltage is detected using an ammeter 34. That is, since the tribovoltage depends upon the level of a fluidized powder, it is possible to detect the level of the fluidized powder based on the measurements of the tribovoltage and interpret whether the level of the fluidized powder is abnormal.