基于PLC的集成式智能穴盘喷淋灌溉系统设计与实现OA

This study addresses the problems of insufficient water control accuracy,uneven spraying,and reliance on manual management in plug seedling irrigation for facility agriculture by designing and implementing a PLC-based integrated intelligent sprinkling irrigation system.The system adopts an S7-1200 PLC as the control core and establishes a closed-loop control model using photoelectric and flow sensors to achieve real-time monitoring and dynamic regulation of spraying flow.Dual-mode nozzles(fan-type and cone-type)are designed and optimized through CFD simulation to improve spray uniformity and droplet size distribution.In addition,the system integrates a water–fertilizer–pesticide proportional mixing unit and is equipped with a touch-screen human–machine interface(HMI)for parameter setting,operation monitoring,and on-site control.Experimental results show that under a working pressure of 0.2 MPa,the spray angle reaches 72°,the Sauter Mean Diameter(SMD)is 0.38 mm,and the coefficient of variation of spray uniformity is controlled within 10%.Compared with manual sprinkling,the proposed system achieves a water-saving rate of 25%–30%and improves the seedling survival rate by approximately 12%.The results indicate that the system effectively enhances irrigation precision and automation levels,providing a feasible path for water conservation and intelligent management in facility agriculture.