Design And Experiment Of A Constant Temperature And Humidity Control System For A Three-Dimensional Shelf Type Seed Warehouse

The scale of China’s crop seed market continues to grow,and the number of seed production,processing,and cross regional sales is increasing.Realizing real-time monitoring and control of the storage environment of seed warehouses,improving their automation level,and making them develop towards intelligence have become the development trend of the future seed storage industry.Aiming at the problems of low ventilation efficiency,high labor intensity,and poor timeliness of ventilation control during manual inspection,a method of combining the control system with the Internet of Things is proposed.A seed warehouse is designed and installed with an automatic temperature and humidity control system.Users can use computers or mobile phone software to remotely monitor and adjust the internal environment of the warehouse.The system is mainly used to control the temperature and relative humidity in the seed warehouse environment.The control system is connected to the Internet of Things cloud server to achieve cloud data storage and transmission.Users can view and control the system operation status on their mobile phones and computers.The main research contents and conclusions are as follows:(1)Design the overall scheme of the control system.The system adopts a modular assembly design,including a power supply module,environmental data collection module,central control module,visual human-computer interaction module,Internet of Things cloud service platform and mobile software,and environmental regulation equipment.(2)Develop a system control cabinet design plan.The circuit design of the control cabinet is equipped with protective devices to ensure the safety,reliability,and stability of the system operation.Analyze the working principle and type selection design of the main electrical devices in the control cabinet of the control system.(3)Design the software for the control system.The system can automatically regulate the temperature and humidity inside the seed warehouse,ensuring data accuracy and system operation stability;Establish a connection between the controller and the cloud server through the Modbus protocol to achieve data and instruction transmission on the cloud service platform of the control system;Visualize touch screen interface configuration and design multiple system operation mode configuration screens.(4)Develop the OneNet cloud service platform and mobile software to achieve remote monitoring of the system.Create a device product in the cloud service platform,complete login and data transmission,and test operation stability;Relying on the MIT APP Inventor platform to develop mobile software,complete login connections,data storage calls,and data instruction transmission between mobile clients and cloud service platforms.Through the above research work,the design and installation of a constant temperature and humidity control system for a seed warehouse was ultimately completed.Field testing and application in the warehouse have proven that the control system can operate stably,achieve data transmission with cloud service platforms,and achieve remote monitoring on computers or mobile phones.The internal storage environment temperature of the warehouse is maintained at about 17℃,and the relative humidity is maintained at about 28%,meeting the storage requirements of the seed warehouse.