| 摘要 |
PURPOSE:To heat uniformly an object to be heated with good thermal efficiency by projecting hearth rolls in a roll hearth type heating furnace like a cantilever from both side walls of a furnace body into the furnace and riding the trays across both rolls. CONSTITUTION:Rolls 5L, 5R are inserted at a specified space through both side walls 1L, 1R of a heating furnace from both sides and are attached freely rotatably by means of bearings 4L, 4R provided to supporting bases 3L, 3R at the outside of the furnace. A tray 11 which is combined with a heat resistant steel material like a grating into the state of avoiding shutting off of heat is placed on the top ends of said rolls across the same by means of notches 12L, 12R provided at both ends. A material 10 to be heated, such as a billet, is placed on the tray 11 and while the tray is heated by upper and lower radiant tubes 2, the tray is moved. Since the rolls for supporting the tray are supported by the cantilever type, the material is uniformly heated without the interference of the heating from the bottom surface and since the rolls are short, the loss of the heat dissipating to the outside of the furnace through the rolls is decreased. |
