NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH ON COMPACTION DEVICE OF SEEDBED LEVELING MACHINE

Currently, the compaction operations in rice seedling greenhouses are mostly performed manually or with simple machinery, resulting in significant discrepancies between the operational effects and requirements. Moreover, simple compaction machinery towed by small tractors cannot meet the dimensional requirements of rice seedling greenhouses. To address the issues of limited types of rice seedling compaction machinery and inability to meet the technical requirements for seedbed compaction quality, an eccentric compaction mechanism suitable for use in rice seedling greenhouses has been designed to reduce manual labor and improve soil firmness and evenness of seedbeds. Based on eccentric vibration theory, the motion equation of the leveling machine was established, and numerical simulations of the eccentric compaction mechanism were conducted using the RecurDyn-EDEM coupling method. Results indicate that the eccentric compaction mechanism effectively resolves the inability of traditional compaction devices to meet soil firmness requirements. Using a seedbed leveling machine independently developed by Heilongjiang Bayi Agricultural University, parameter optimization experiments were conducted using a second-order orthogonal rotational combination simulation method. The optimized parameter combination was: forward speed of 0.708 m/s, eccentric shaft rotation speed of 63.23 rad/s, and counterweight box mass of 50.99 kg, resulting in soil firmness of 3156.554 kPa and evenness of 0.02573 m. The experimental results were within 5% relative error of the simulation optimization results, indicating that the seedbed soil firmness and evenness meet agronomic requirements and have practical application value.