拌胶机控制系统PLC设计-毕业论文（设计）.doc

拌胶机控制系统PLC设计 摘 要 随着我国基础设施建设及国家与地方对高速公路、铁路、及县乡公路、城市建设的投资力度进一步加大，随着通乡达村公路的大规模修建、小城镇建设大规模改造，各型混凝土搅拌机必将有广阔的市场前景，为此作为设备制造单位如何提供质优价廉性能可靠，节能环保，维护方便的混凝土搅拌机，应用了西门子S7-300系列PLC完成该系统的控制。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，用电磁流量计检测胶流量；刨花和胶要按一定的比率送到搅拌机内搅拌，然后将混料供给下一道工序蒸压成型。刨花量和胶流量恒定，并有一定的比例关系。双轴搅拌机采用双轴对向搅拌，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。调胶系统采用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，可以避免胶的浪费。因此，为企业及国家节省了大量的资金和生产原料。 关键词：PLC；PID；S7-300；变频器 Mix the Gum Machine Control System Design Besed on PLC ABSTRACT With China's infrastructure construction and the national and local to the highway, railway, highway, city and county and township government investment in the construction of the township to increase, with the large-scale construction of village highway construction of small towns, large scale transformation, each concrete mixer will have broad market prospect, and therefore as equipment manufacturing unit how to provide high quality and reasonable price reliable performance, energy conservation and environmental protection, maintenance convenient the concrete mixer, the Siemens PLC application series s7-300 series to complete the system control PC. Mixer control system by two-stage spiral feeder supply 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 adhesive glue is an hazy spray into the particle. The rubber mixing system equipped with the machine can make curing agent and the rubber in the mix of, rather than the curing agent added to the glue tank. This system has a stir well, glue low quantity function. Adjustable glue system USES PLC centralized control, PLC according to