Shaft furnace by the angle, channel, steel plate welded into the cylindrical shell, inner shell for lightweight refractory brick layer, laying into the shaft-type furnace, the furnace heating elements placed in the brick wall resting on the outer ring in the furnace , including a layer of aluminosilicate refractory fiber as insulation, heat insulation layer and the insulation between the shell with powder, diatomaceous earth brick bandits fill insulation layer implementation, the middle of a cylindrical furnace loading basket, the processing of parts loading into the basket for heating, in order to ensure loading into the basket and hanging out in the safety, the heating element and loading baskets with a layer of protection between the basket, with a roof fan, as a mixing chamber in the heating process the air, so that the furnace temperature as even as possible, before the lid in the open, to be cut off the power. 

 Pit furnace http://www.dy-gyl.com