机电一体化毕业论文设计精要.doc

三明职业技术学院 毕业作业 作业形式： 毕 业 设 计 作业题目：SY-4Γφ660X2300压延技改 姓 名： X X X 学 号： 1411080019 所 在 系： 机 械 电 子 系 专 业： 机电一体化技术 年(班)级： 2017届函授班 学 制： 三 年 制 指导教师： 张 琳 芳 完成日期： 2016年12月10日 摘 要 压延机的发展历史可以追溯到1830年，那时的压延机是用于橡胶制品加工的，塑料PVC压延机是从橡胶压延机逐渐演变过来的。塑料PVC压延机在塑料机械产品中重型高精度产品，是塑料PVC制品加工过程中的基本设备，主要用于胶料压膜、纺织物贴胶、胶膜帖合等关键工艺。公司的第一条四辊压延生产线为十四年前2002年3月生产的设备2003年6月投入使用。该产品技术含量低，四辊调速器采用模拟量直流调速器，调速系统反应慢，该压延机的操作速度速比完全是靠主操作手凭经验观察产品的松紧来调整速度，升降速速度要很慢才能控制好产品的厚薄度。压延控制系统PLC已经过时，故障率高，维修配件要到国外购买并且很耗时间维修成本也高。因此压延机的改造对提高产品质量、降低成本是非常重要和必要的。具体的改造内容为：1、对压延四辊模拟量直流调速器改为变频器调速系统，变频器调速系统结构简单，调速平滑稳定，性能好、效率高、节能性好，易于实现自动化操作。2、把该生产线的给定控制板改成西门子PLC，来提高设备的稳定性和运行水平，降低备件成本。 关键词：压延机；直流调速器；S7300PL 目 录 前言·······················································································3页 绪论·············································································4页 1.1压延机的发展现状································································4页 1.2本设计要完成的工作及要求····················································4页 第二章 调速器的改造·································································5页 2.1直流电机控制······································································5页 2.2直流电机转速调节原理和实现方案···········································6页 2.3 励磁回路的改造··································································7页 2.4 报警回路的改造··································································8页 2.5调试··················································································8页 第三章 给定系统的改造····························································10页 3.15S和S7输入输出的连接·······················································10页 3.2全线给定的形成和张力控制··················································10页 3.2.1压延张力控制的改造························································10页 3.2.2卷绕控制··································································