盘育秧精密播种流水线PLC控制系统设计

超级稻每穴1～2株的栽植农艺给机械插秧的盘育秧播种提出了低播量、高均匀性的严格要求，为满足超级稻少本稀植的农艺要求，研发了振动气吸式盘育秧精密播种流水线。设计了以PLC为核心，集自编程序、传感器、步进电机加减速驱动脉冲控制等技术为一体的自动控制系统。在GX-Developer-C V8的环境下采用梯形图方法编制程序实现播种作业的协调动作和部件运动的精确定位，并可接入PC机实现播种作业的在线监控。试验和检测结果表明，播量精确到每穴1～2粒（格），均匀度合格率93.8%，空穴率5.6%，盘播种量一致性变异系数为2.5%，作业效率达每小时490盘，能满足超级稻及常规稻盘育秧精量播种要求。

Design of PLC controll system of precise seeding assembly line for rice seedling nursing

Agronomic techniques require 1or 2 seedlings in one cavity during the super-rice transplanting. It requested low quantity sowing and high uniformity machine transplantation. A high precision seeding assembly with vibration and air-suction for rice seedling nursing was developed to meet the requiements of precision and small quangtity in super-rice transplanting. An automatic control system based on PLC (programmable logic controller) was designed. Automatic programming techniques, sensor technology, and acceleration and deceleration control of step-motor were integrated into the system. System controlling software was programmed in the form of ladder diagram by GX-Developer-C V8, realizing accurate positioning of act device and coordinated of the action, and it can connect to PC to realize a real-time monitoring to the process of the sowing. The experiment and test of the seedling assembly indicated that seedling accuracy reached about 1-2 seeds per grid, passing rate of uniformity was 93.8%, space rate was 5.6%, unevenness of feeding rate between plates was 2.5%, operation efficiency reached 490 plates per hour. The automatic control system completely meets the requirements of seedling nursing precise sowing and transplanting for super-rice and conventional rice.