基于plc搅拌机控制系统的设计-学位论文

基于 PLC 搅拌机控制系统的设计摘 要随着我国十二五规划的进一步推动，国家对各项基础设施投资力度的进一步加大，市场对优质刨花板的需求将进一步提高。为此，如何提供优质、廉价、性能可靠、节能环保、维护方便的刨花板生产设备，已成了设备厂商急需解决的问题。本文应用了西门子 S7-300 系列 PLC 完成该系统刨花拌胶、搅拌控制。搅拌机控制系统的刨花由螺旋给料机供给，压力传感器检测刨花量。胶由胶泵抽给，电磁流量计检测胶流量；刨花和胶按一定的比例送到搅拌机内搅拌，然后将混合料供给下一道工序蒸压成型。要求刨花量和胶流量恒定，并有一定的比例关系。双轴搅拌机采纳双轴对向搅拌，搅拌机的喷胶器使胶呈雾状喷射到刨花中。该系统配备的混胶器可以使固化剂与胶在其中混合，而不是把固化剂加到调胶罐中。本系统具有搅拌均匀、施胶量低等功能。调胶系统采纳 PLC 集中控制，PLC 根据各部传感器得到刨花的重量、含水率，来调整施胶量的固体含量。使施胶后的刨花含水率控制在理想的状态上。这样的优点是在生产线临时停机时，可以避开胶的浪费。因此，为企业及国家节约了大量的资金和生产原料。关键词：PLC；PID；S7-300；变频器The Design Of the Mixer Control System Based on PLCABSTRACTAs the 12th five-year plan is further on, the state goes on increasing the infrastructure investment ,and the market will need the more high-class particleboard . So how to provide cheap ,reliable performance, energy saving and easy maintenance particleboard production equipment needs to be resolved . Siemens PLC application series s7-300 series is to complete the system control. PC. Mixer control system by two-stage spiral feeder supplies pressure sensor detection processes, quantity. By glue pumps to glue, glue with electromagnetic flowmeter test flow; Particle and glue to at a certain rate to stir the mixer, and then will mixing supply a process under autoclave to shape. Paring quantity and plastic flow, and a certain constant relationship of scale. Dual axle mixer used for mixing, blender to further the spray adhesiv...