Research on Optimization Design of Stereoscopic Rice Seedling Cultivation Device

To address the issues of extensive land occupation, inadequate utilization of space resources, and the hardship in manually replacing seedling trays in traditional rice seedling cultivation, this study put forward a seedling cultivation device and carried out its optimization. In contrast to traditional seedling cultivation equipment, this seedling cultivation device employs a rotary axis structure in combination with an eccentric wheel disc mechanism, relying on synchronous belt transmission to drive the main shaft's rotation. There are two rotating discs on the left and right sides of the device, with an eccentric wheel disc added on one side. A number of seedling cultivation trays are evenly coordinated with the rotating discs on the surface, enabling the stable rotation of the trays. This three-dimensional seedling cultivation significantly enhances seedling cultivation efficiency and fully exploits the resources within the space. The seedling cultivation tray serves as the main load-bearing component of the device, and its structure and load-bearing capacity exert a significant influence on the entire device. The seedling cultivation tray remains parallel to the ground and rotates around the central axis while rotating along with the rotating plate, achieving the balanced utilization of light, temperature, and moisture resources in the space and enhancing the utilization rate of seedling cultivation resources. The synchronous belt drive employed possesses advantages such as a suitable working environment, guaranteed transmission efficiency, and improved transmission stability. This study designed different types of tray structures and analyzed the load conditions of each tray through finite element analysis, static mechanical stress analysis, and experimental verification, and selected the optimal tray structure. The designed tray has undergone improvements in ribs and drainage holes, and the most favorable tray structure was obtained. The experimental results demonstrate that the strength and stiffness of the device proposed in this study meet the requirements.