基于PLC的沥青混凝土搅拌生产线控制系统毕业设计（论文）.docVIP

摘 要 沥青混凝土搅拌生产线是随着沥青混凝土的诞生而产生和发展的。它是建筑、桥梁、道路、大坝等工程施工中的必备生产线。随着电力电子技术及控制技术的发展，使得交流变频调速在工业电机拖动领域得到了广泛应用。由于PLC的功能强大、容易使用、高可靠性，常常被用来作为现场数据的采集和设备的控制。 本文针对PLC和配料控制器结合控制的搅拌生产线来设计其控制及监控程序，设计中主要完成的任务有系统构造、PLC的I/O分配、工作流程图及PLC程序的编写。本系统选用西门子S7-200 PLC做控制器，完成数据的采集和对变频器、电机等设备的控制任务。采用通用变频器三菱FR-A540，对4个电机进行转速调节。编程软件选用STEP7，采用顺序控制策略。利用组态软件良好的人机界面和通信能力，使工作人员可以在触摸屏上就可以方便的浏览现场的工业流程、实现变频器的参数设置、故障诊断及电机的启动和停止。 用PLC做控制器，完成对沥青混凝土搅拌生产线的自动控制，该沥青混凝土搅拌生产线是将两种石料、两种粉料和沥青三类材料，根据工程配方称重后放到搅拌缸中进行充分搅拌，搅拌后放入到小车并存放到储料罐中，系统周而复始地工作。 关键词：沥青混凝土搅拌生产线；变频器；可编程控制器（PLC）；自动控制 Abstract Asphalt concrete mix production lines were producted and developed with the birth of concrete with tar. It is the construction of the necessary equipment for buildings, bridges, roads, dams and other projects. With the development of electric power and electronic technology and control technology，AC frequency conversion velocity modulation technology is widely used in the industry motor dragging fields．Because of the characteristics with powerful function，easy operation and high dependability，PLC is usually used for the field of data gathering and equipment control. In this paper, the controller combines PLC and the control of mixing ingredients production line to design its control and monitoring process, the design of the main tasks in a systematic structure, PLCs I / O allocation, work flow and procedures for the preparation of PLC. The system uses Siemens S7-200 PLC controller to do to complete the data collection and on the drive, motor and other equipment of the control tasks. Using a common drive Mitsubishi FR-A540, on the 4 motor speed control. Programming software used STEP7, use sequential control strategies.By the virtue of HMI with nice configuration software and strong communication ability，the staff can conveniently browse the industry flowFig on the locale，set the parameter of the transducer, diagnose the fault，and start or stop the electromotor on the PC machine in the control-center room． To do with the PLC contr