DESIGN AND EXPERIMENT OF AN INTEGRATED PRUNING, THRESHING AND BRANCH CHOPPING MACHINE FOR GREEN PRICKLY ASH

Aiming at the difficulty and low efficiency of threshing green prickly ash, a small-sized integrated pruning, threshing and branch chopping machine driven by a DC motor was designed and studied. The dynamic and static analyses of the tubular straight-cut threshing device and the clamping traction roller-cutting device were carried out respectively. The results show that the maximum shear stress on the green prickly ash branch during the cutting and separation process is 0.156 MPa. The maximum stress on the cutting blade of the clamping traction roller-cutting device is 333.99 MPa, and the maximum strain is 0.0017, which fully meets the usage requirements. The response surface analysis experiment was conducted with the moisture content of green prickly ash branches and the motor speed as the influencing factors and the undamaged threshing rate as the index. After optimization and solution, it was found that when the moisture content of green prickly ash branches was 43% and the motor speed was 1488 r/min, the undamaged threshing rate reached 95.9%, and the integrated pruning, threshing and branch chopping machine for green prickly ash reached the optimal working state.