HEATING FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a heating furnace with which a large-diameter annular material to be heated can uniformly be heated. SOLUTION: The heating furnace 1 is provided with: a furnace hearth 2 in which the annular material W to be heated is placed on the upper surface; a cylindrical furnace wall 3 which surrounds the circumference of the furnace hearth 2d and in which rod heaters 3a for heating the material W are arranged on the inner circumferential side; and an upper cover 4 which covers the upper end opening hole part of the furnace wall 3 to be freely openable/closable. The furnace hearth 2 is provided with: an annular rotating hearth part 6 to be rotatingly drived around the center of a cylindrical shaft on the furnace wall 3; a centrifugal fan 8 which is arranged on the inner circumferential side of the rotating hearth part 6 and stirs the atmosphere in the furnace; and a supporting member 20 which is arranged to be integratedly rotatable on the upper surface of the rotating hearth part 6 and supports the material W and through which the blasting air by the centrifugal fan 8 can be passed. COPYRIGHT: (C)2010,JPO&INPIT