Simulation Design of Gear Shifting Mechanism of Reeds Harvester

The key parts of reed harvester are teeth and transmission device.How to harvest effectively is the key problem of reed harvesting，and the key of effective harvesting is plan of teeth path.Based on research of reed harvester's tooth shifting and movement mechanism，crank connecting rod mechanism with quick return characteristics were selected to realize arc movement track of tooth shifting.According to harvesting demand，and with calculation of theoretical relationship，it was obtained that length of the crank was 250 mm，length of rocker was 330 mm，length of connecting rod was 690 mm，and length of frame was 650 mm.Then，driving device of crank connecting rod mechanism was determined.Considering linkage requirements that cranks of left and right shift geared turn in opposite directions，rotated at the same speed，and also two cranks always maintained 180 ° angle difference，chain drive and primary gear drive were determined to achieve the linkage.According to requirements，key dimensions of chain and gear were determined.With size of crank connecting rod，gear，sprocket and gear，the parts were drawn and assembled with Pro/E software，and then carrying out motion simulation of design mechanism.Through parameter adjustment，position of the gear on connecting rod was offset by 75 degrees could meet good harvest effect，and motion trajectory of designed gear shifting mechanism also met design requirements.The design and simulation ideas could be a reference for design of related harvesters.