基于PLC自动配料控制系统设计.doc

基于PLC自动配料控制系统设计 摘 要 自动配料系统是集输送、计量、配料、定量等功能于一体的动态计量系统,在建材、化工、冶金、矿山、电力、食品、饲料加工等行业中得到广泛应用。随着科学技术的发展，工业化程度的提高，常需要对自动配料系统中输送的流量进行调节、控制达到准确的配比。 本论文主要针对自动配料系统恒流量控制达到配比的控制要求，设计一套基于PLC的自动配料系统，并使用上位机开发运行管理界面。自动配料控制系统有以下部分组成：PLC(控制中心)、变频器（驱动中心）、皮带驱动电机。用于称重的传感器。系统在运行过程中，需要采用顺序启动，使用变频器对三台电机进行驱动并调速。在物料称重方面，使用传感器进行称重并计量。可编程控制器通过设定的物料流量和反馈回来的物料流量进行比较计算差值，经过PID调节输出控制变频器的速度。实现物料的恒定流量调节。采用组态王软件对控制系统进行监控和仿真。 【关键词】 ： 自动配料 变频调速 PID调节 PLC Abstract The auto-dispensation system is widely used in industrial, such as Building Materials industry, Metallurgical industry, food processing industry. According to the prescription, this system can transport the needed materials and calculate it. With the development of science and the improvement of the industrialization, it’s necessary to adjust the flow that the auto-dispensation transports and controls to the accurate ratio. This paper mainly aimed at the automatic batching system of constant ratio of flow control to control requirements, design a set of automatic batching system based on PLC, and use configuration software development operation management interface. Automatic batching system is constitute by programmable controller (PLC), inverter, belt drive motor, weighing sensor, computer, etc. System contains three belt drive motor, which in turn according to need order started. Frequency converter, is adopted to realize frequency control of motor speed of three-phase motor. Weighing sensors for weighing and real-time measurement for the material, PLC calculates the real-time flow and cumulative flow, more set value and the actual flow deviations by the PID adjustment to change output signal to control the frequency converter speed adjustment of belt drive motor, so as to realize constant flow control, and communication 【KEY WORD】: the auto-dispensation system, variable frequency speed control, PID control, PLC 目 录 第一章 自动配料系统的基本构成 - 1 - 1.1 电子皮带秤 - 1 - 1.2 可编程控制器 - 1 - 1.3 变频器 - 6 - 1.4 本课题主要研究内容 - 7 - 第二章 自动配料系统的总体设计 - 8 - 2.1 自动配料系