Abstract:In order to overcome the shortcomings of traditional linear soil-bin test bed, a kind of rotary round soil-bin test bed was proposed. To compensate the processing and assembly errors of the large-size round soil-bin test bed and provide convenience for the following simulating field trials of agricultural machinery, a driving scheme of rotary round soilbin test bed driven by tire friction was optimized. Mechanical adjusting device for initial installation position of the rotary round soilbin test bed driven by tire friction was designed, and the soil-bin roundness compensation capability was calculated. The control system for the proposed rotary round soil-bin test bed was designed, and the closed-loop system was established with PLC as controlling unit and servomotor as executive device. All of these made the soil-bin test bed run at a steady speed; it was found that the test bed can compensate for roundness of soil-bin, it can smoothly run at the speed of 0~3.8r/min, the maximum standard deviation of speed fluctuation was 0.038r/min, the longest time required from the start to smooth running was 9.8s. Transplant experiment with planting mechanism was carried out; the spacing coefficient of variation was 4.46% which means good uniformity and can well meet the transplanting agronomic requirements.