Heat leakage prevention structure for shielding peripheral gap of transmission shaft

The utility model discloses a heat leakage prevention structure for shielding a peripheral gap of a transmission shaft, which comprises a plurality of heat insulation sheet groups, and each heat insulation sheet group comprises a pair of upper heat insulation sheet and lower heat insulation sheet; gaps are reserved between the outer side surfaces of the left and right ends of the transmission shaft and the bottom surfaces of the left and right side walls of the upper furnace body as well as between the outer side surfaces of the left and right ends of the transmission shaft and the top surfaces of the left and right side walls of the lower furnace body; in the running direction, the multiple upper heat insulation pieces are arranged in a row in a front-and-back connection mode and shield gaps between the outer side face of the transmission shaft and the bottom faces of the left side wall and the right side wall of the upper furnace body, and the multiple lower heat insulation pieces are arranged in the other