Furnace bottom roller of heating furnace

The utility model relates to a heating furnace bottom roller and belongs to the technical field of heating furnaces in the metallurgical industry. According to the technical scheme, a furnace wall (3) is anchored on a furnace shell (2) through anchoring nails, a furnace roller (4) penetrates through the furnace shell (2) and the furnace wall (3), the two ends of the furnace roller (4) are exposed out of the furnace shell (2), the two ends of the furnace roller (4) are supported on a bearing seat (1), the bearing seat (1) is fixed to a support (7), and the support (7) is fixed to the furnace shell (2); the expansion joint (6) with the flange is sleeved on the furnace roller (4) outside the furnace shell (2), two ends of the expansion joint (6) with the flange are respectively connected with the bearing seat (1) and the furnace shell flange (8), the furnace shell flange (8) is fixed on the furnace shell (2), the fire-resistant sleeve (5) is sleeved on the furnace roller (4) in the furnace shell (2), and the fir