目前我国的大部分企业受到资金短缺，管理方面的限制，送料装置一般采用人工送料。但是人工送料劳动力大，效率低，而且容易造成事故。因此本文针对砂轮厂人工送料系统进行了自动化改造。
本着降低成本，提高效率，保障安全的原则，设计了以PLC为核心的砂轮自动控制送料系统,利用变频器实现变速送料,称重传感器完成自动称重和物料入模。先根据控制要求，选择了系统的主要硬件并完成电气线路的搭建。然后设置了变频器的参数和PLC的程序。通过模拟调试,该系统具有操作方便,工作可靠,提高生产效率,大大减少劳动率的问题.从而实现工业送料自动化成为“无人值班，少人值守”的控制系统，具有很高的推广价值。
关键词：PLC；变频器；砂轮送料；称重传感器
At present, most enterprises in China under the shortage of funds, management restrictions, feeding device generally uses the artificial feeding. But the artificial feeding labor, low efficiency, and easy to cause the accident. So according to the grinding wheel factory of artificial feeding system for the automatic transformation.
With lower costs, improve efficiency, safety principles, design of the grinding wheel to PLC as the core of the automatic feeding system, the realization of variable speed feed the use of inverter, the weighing sensor automatic weighing and material into the mold. According to control requirements, select the main hardware system and set up complete electrical circuit. And then set the parameter and PLC program. Through the simulation and debugging, the system has the advantages of convenient operation, reliable work, improve production efficiency, reduce labor rate. In order to achieve industrial feeding automation has become a “unattended, control system for unattended operation”, has the very high value of popularization.
Keywords: PLC; inverter; grinding wheel feeding; the weighing sensor
摘 要……………………………………………………………………………………………………………….. I
Abstract……………………………………………………………………………………………………….. II
目 录…………………………………………………………………………………………………………….. III
第一章 绪论……………………………………………………………………………………………………….. 1
1.1 概述………………………………………………………………………………………………………….. 1
1.2 设计任务与总体方案的确定……………………………………………………………………………….. 2
1.2.1设计任务………………………………………………………………………………………………… 2
1.2.2 控制要求……………………………………………………………………………………………….. 2
第二章 PLC基础知识……………………………………………………………………………………………. 2
2.1 PLC的基本结构及部分作用………………………………………………………………………………… 3
2.2 PLC的工作原理……………………………………………………………………………………………… 5
2.3 PLC控制系统的设计的原则………………………………………………………………………………… 6
2.4 PLC控制系统的设计步骤…………………………………………………………………………………… 8
2.5 PLC的编程语言及编程……………………………………………………………………………………. 10
2.6西门子S7-200PLC…………………………………………………………………………………………. 11
第三章 砂轮送料系统的介绍………………………………………………………………………………… 13
3.1 自动送料系统特点………………………………………………………………………………………… 13
3.2 砂轮送料系统组成………………………………………………………………………………………… 13
3.3 称重传感器………………………………………………………………………………………………… 15
第四章 砂轮送料硬件设计…………………………………………………………………………………… 18
4.1 PLC选定………………………………………………………………………………………………….. 18
4.2 变频器…………………………………………………………………………………………………….. 18
4.3 主电路电气原理图……………………………………………………………………………………….. 19
4.4 I/O地址分配表……………………………………………………………………………………………. 19
4.5 PLC硬件接线图………………………………………………………………………………………… 20
第五章 砂轮送料系统软件设计…………………………………………………………………………….. 21
5.1 PLC的软件设计………………………………………………………………………………………….. 21
5.1.1 砂轮送料顺序功能图………………………………………………………………………………… 21
5.1.2 梯形图………………………………………………………………………………………………… 22
5.2变频器参数设置……………………………………………………………………………………………. 24
5.2.1复位参数………………………………………………………………………………………………. 24
5.2.2电动机参数设置………………………………………………………………………………………. 24
5.2.3 控制参数设置……………………………………………………………………………………….. 24
第六章 总结与展望……………………………………………………………………………………………. 25
致 谢…………………………………………………………………………………………………………….. 26
