PLC在注塑机控制系统中的应用

PLC在注塑机控制系统中的应用

摘要

注射成型（注塑）是加工塑料制品的主要方法之一，这种方法能制得外形复杂、尺寸精确和带有金属嵌件的制品，对各种聚合物加工的适应性强，易于实现全自动化生产，因此在塑料机械中占有很大比重。因此，开展基于PLC的注塑机的控制研究。必将推动注塑生产的长足进步和繁荣发展，不仅为社会提供高质量产品，还可排除安全隐患、保障生命和财产、节约资源、保护环境，提供更加重要的无形的社会财富。本设计在分析注塑机的工艺流程的基础上，首先确定了总体设计方案，采用西门子S7-200中的CPU226 PLC对注塑机的控制系统进行设计。接着，在硬件设计中，统计并分配了I/O点，绘制出I/O接线图，设计了主电路和液压回路。最后，在软件设计中，通过学习使用西门子STEP7编程软件进行编程和调试。通过使用PLC对注塑机控制系统的改造，不仅能够达到原有的控制功能，而且还提高了控制系统的精度，方便维修。

关键词：注塑机，西门子S7-200，控制系统，仿真

Application of the jinjection molding machine

control system of PLC

ABSTRACT

Injection molding processing plastic products ( injection ) is one of the main methods, this method can make the shape of complex, ruler.Inch precisely and with embedded metal parts products, for a variety of polymer processing adaptability, easy to realize automatic production, so in the plastic machinery occupies a large proportion of. Therefore, to carry out the injection molding machine based on PLC control research. Will promote the injection molding of the great progress and prosperity, not only for the community to provide high quality products, also can eliminate the hidden danger of safety, protect life and property, to save resources, protect environment, offer more important the incorporeal wealth of society.The design in the analysis of injection molding machine on the basis of technological process, first to determine the overall design plan, adopts Siemens S7-200CPU226PLC of the injection molding machine control system transformation. Then, in the hardware design, statistics and the distribution of I / O, I / O wiring diagram drawing, design of the main circuit and the hydraulic circuit. Finally, in the

software design, through the study of the use of Siemens STEP7 programming software programming and debugging. PLC through the use of injection molding machine control system, can not only achieve the original control functions, but also improves the precision of control system, convenient repair.

KEY WORDS: injection molding machine, Siemens S7-200, control system, simulation

目录

前言1

第1章课题总体设计方案2

1.1 注塑机构成2

1.2 主要研究任务2

1.3 注塑机工作流程2

第2章硬件设计5

2.1 PLC机型的选择5

2.2 I/0定义号分配8

2.3 I/O点接线图10

2.4 主电路设计11

2.5 液压控制回路设计13

2.5.1 基本回路的选择13

2.5.2注塑机液压系统工作原理15

第3章软件设计17

3.1 编程方法的确定17

3.2 绘制动作流程图17

3.3 梯形图程序的设计19

第4章组态设计30

4.1 组态王概述30

4.2 建立工程步骤30

4.3 组态设计31

4.3.1 建立文件31

4.3.2 设计外形32

4.3.3 组态王连接设备33

4.3.4 动画连接35

4.3.5命令语言36

结论38

辞39

参考文献40

外文资料翻译41