Apparatus for treating workpieces in a bed of particles

摘要

Apparatus for treating workpieces in a bed of particles, e.g. for heat treating workpieces in a fluidize bed, comprises a chamber which contains the bed, a conveyor for conveying workpieces through the chamber into contact with particles of the bed within the chamber, and transporting means for transporting back to the bed particles which fall from the conveyor or workpieces after the conveyor and workpieces have advanced from the bed. The conveyor may comprise a rotatable open work drum, having an internal helical formation for advancing workpieces through it and an external helical formation of opposite hand to that of the internal helical formation to constitute the transporting means.