Fin type gypsum calcining machine

A finned gesso calcining machine has the substantial conformation that an inclining furnace cavity is inwardly provided with a heating tube of peripheral spiral fins, and a material inlet of the furnace is provided with an inlet material blending mechanism and a material sealing mechanism. A material outlet connects with a steam chamber which is fixed with an opening of the heating tube and connects with one end of a large terminal canister which is inwardly provided with a small terminal canister with spiral lifting flights equipped between the two. The small terminal canister is inwardly provided with steam inlet tubes connecting with the steam chamber, and the other end of the water discharging tube connecting with the small terminal canister connects with the water discharging holes on a water leading slot. The other end of the large terminal canister of the steam chamber is inserted in a feed-through on a side wall of the material outlet box which has air holes on the upper portion and material outlet holes on the lower portion, and the end of the small terminal canister of the steam chamber penetrates the material outlet box and is inserted in the feed-through on the other side wall. The top of the terminal butt-joining with a steam shaft whose rear is provided with a steam inlet feed-through corresponding to the steam inlet, and a water discharging feed-through corresponding to a condensed water outlet on the steam shaft outside a steam inlet cavity. This utility model has the advantages of heat exchanging area, high productivity and heat efficiency, adequate heating and products quality.