DOUBLE-ROLLER DUAL GEAR TRANSMISSION BOX AND DOUBLE-LONGITUDINAL AXIAL FLOW HARVESTER

Some embodiments of the disclosure provide a double-roller dual-gear transmission box and a double-longitudinal axial flow harvester. According to the double-roller dual-gear transmission box, an input shaft is mounted in an input dual-gear box assembly, a first-gear driving gear and a second-gear driving gear are mounted on the input shaft, and a shift fork shaft is mounted in the input dual-gear box assembly; a shift fork is mounted on the shift fork shaft, and the shift fork is connected with an engagement sleeve; a first end of the second shaft is rotatably mounted in the input dual-gear box assembly, and a second end of the second shaft is rotatably mounted in the output box assembly; the engagement sleeve, a first-gear driven gear, and a second-gear driven gear are mounted on a first shaft section portion of the second shaft.