毕业论文设计《S7-200_PLC在薄钢板自动剪切控制系统中的应用》.doc

PAGE S7-200 PLC在薄钢板自动剪切控制系统中的应用 摘要 针对普通剪切机或传统自动剪切机存在的不足，为满足中小企业对普通剪切机进行技术改造和升级的需求，提出一种基于可编程逻辑控制器S7-200PLC 的薄钢板自动剪切控制系统方案并实现。当系统传送薄钢板过来时，采用光电编码器检测系统对钢板的尺寸自动计数，当与设定值（要求用拨码盘设定）一致时启动冲压系统对薄钢板进行剪切，如果大于设定值时,电机反转,直至与设定值一致。本课题的设计关键是薄钢板的剪切精度控制。本设计内容主要包括系统总体设计，系统硬件设计，系统软件设计，具体介绍了薄钢板自动剪切控制系统结构组成，确定相关电路参数，选择器件型号，给出系统的硬件连线图，软件流程图和程序清单。 本设计的薄钢板剪切自动控制系统，剪切精度较高，提高了生产效率，安装方便，具有一定的应用和经济价值。 关键词：S7-200 PLC；自动剪切；光电编码器；变频调速 S7-200 PLC IN THE AUTOMATIC SHEET CUTTING CONTROL SYSTEM ABSTRACT According to the insufficient of ordinary shear machine or conventional automatic cutting machine,in oder to meet the SMEstechnological transformation and upgrade needs of ordinary shearing machine ,the design shows a project of automatic control system for thin steel plate shear,and to make it work.When it transmitting over the thin plate,the system adopts photoelectrical encoder detection system to automaticly count steel size.If steel counting size(required with a dial disc set) and setting size are the same,system starts stamping system to cut the plate,and if more than the set value, the motor reversal,until consistent with set up.The key is the design of precision control of thin steel plate shear.This design mainly includes system design, hardware design, system software design,describes details of structure for thin plate automatic cutting system,identifys the circuit parameters,and choose device type, gives the system hardware and software flow chart and even programming list. The design of automatic control system of cutting thin plate,improves the precision of shearing,improves the production efficiency,offers convenient installation,has certain application and economic value. Key words: S7-200 PLC；automatic shear; photoelectric encoder；frequency 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc264812993 1 绪论 PAGEREF _Toc264812993 \h 1 HYPERLINK \l _Toc264812994 1.1 课题背景和目的意义 PAGEREF _Toc264812994 \h 1 HYPERLINK \l _Toc264812995 1.2 设计的现状和发展趋势 PAGEREF _Toc264812995 \h 1 HYPERLINK \l _Toc