(完整版)小方坯连铸拉矫机控制系统设计毕业设计

毕业设计（论文）

题目小方坯连铸拉矫机

控制系统设计

专业自动化

班级电气101

学生沙玉楠

指导教师李好文

2014 年

小方坯连铸拉矫机控制系统设计

专业：电气工程及其自动化

班级：电气101

作者：

指导老师：职称：

答辩日期：

摘要

近年来，板坯连铸机成为大型钢铁公司的主要设备，它提高了钢铁的综合成材率，降低了能源消耗，并且更容易实现机械自动化。而小方坯连铸机则以其良好的投资回报，赢得了国营中小钢铁公司和私营钢铁企业的青睐。拉矫机作为连铸机的核心设备，它是连铸机的指挥中心，其他设备的工作状态都必须与拉矫机相协调。

本设计的内容是通过PLC对拉矫机进行控制，完成连铸过程中送引锭、拉坯、拉尾坯三个工作流程。其中用到两台电动机，其速度控制由变频器完成；拉矫辊的压下和抬起动作由电磁阀控制。由S7-300PLC 模块构建控制系统，采用西门子公司的STEP7编程软件完成拉矫机控制系统梯形图的程序编制。

变频器既可以实现电机速度连续可调，也可以控制电机以固定速度运转：PLC通过0-10V或4-20M A的模拟量信号来控制变频器频率输出为0-50Hz，即可完成电机速度连续可调的控制；用几个数字量输出点控制变频器的高、中、低速，电机即可按所需的固定速度运转。

关键词：连铸拉矫机、PLC控制、梯形图、变频器

Abstract

In recent years, the slab casting machine equipment of a large Steel Corp, it improves the steel finished product rate, reducing energy consumption, and easier to realize mechanical automation. While the small billet continuous casting machine with its good investment returns, won the state and Steel Corp and private iron and steel enterprises. Straightening machine as the core equipment of continuous casting machine, it is the continuous casting machine command center, other equipment working state must be coordinated with the straightening machine.

The contents of this design is through the PLC to control the tension leveller, completed in the process of continuous casting, casting, feeding dummy ingots pull tail billet three working process.

Which uses two motors, its speed is controlled by the inverter; pulling straightening roller pressure and lift the action is controlled

by electromagnetic valve. Construction control system is composed

of S7-300PLC module, the Siemens company STEP7 programming software to complete the withdrawal straightener control system trapezoidal chart programming.

Frequency converter can realize a continuous and adjustable speed motor, can control the machine running at a fixed speed: PLC through the analog signal 0-10V or 4-20MA to control the inverter output frequency is 0-50Hz, to complete the control of motor speed adjustable; several digital output control frequency converter, motor, speed, can according to fixed speed required for the operation. Keywords: continuous casting machine, plc control, ladder diagram

目录

前言 (1)

第1章绪论 (3)

1.1 连铸机研究的意义 (3)

1.2 国外连铸技术的发展近况 (3)

1.3 我国连铸技术的发展近况 (4)

1.4 小方坯连铸的发展近况 (5)

第2章连铸拉矫机主要设备简介 (7)

2.1 S7-300系列PLC系统特性及硬件构成 (7)

2.1.1 S7-300系列PLC硬件系统 (7)

2.1.2 S7-300系列PLC模块性能简介 (9)

2.2 变频器简介 (10)

2.2.1 概述 (10)

2.2.2 基本组成 (11)

2.2.3 工作原