毕业设计基于PLC包装码垛生产线控制系统设计.doc

摘要 传统的机械设备与产品，多是以机械为主，是电气、液压或气动控制的机械设备。随着工业水平的不断发展，机械设备己逐步地由手动操作改为自动控制，设备本身也发展成为机电一体化的综合体。可编程序控制器(PLC)是以微处理器为核心，综合计算机技术、自动化技术和通信技术发展起来的一种新型工业自动控制装置。经过30多年的发展，目前，可编程序控制器已成为工业自动化领域中最重要、应用最多的控制装置，己跃居工业生产自动化四大支柱(可编程序控制器、数控机床、机器人、计算机辅助设计与制造)的首位。其应用的深度和广度已成为衡量一个国家工业先进与自动化程度高低的标志。 包装码垛自动生产线适用于石油化工、化肥、粮食、港口等行业，可对PP、PE粒子、PVC、化肥、粮食等粉状、颗粒状物料进行全自动包装码垛作业，便于用户储存、运输和销售，全自动包装码垛生产线主要由自动定量包装机、自动上袋机组、封口系统、倒袋机、金属检测机、重量检验机、检选机、喷墨打印机、码垛机等单元组成。通过可编程序控制器、对整个生产线的工作过程进行自动控制，对运行过程中出现的故障或供料不足，供袋不及时、出垛不及时等，进行声光报警。该设备具有操作简单，运行可靠，维修方便等优点。 关键词:PLC，控制系统，包装码垛生产线 Abstract Most conventional mechanical facilities are machines. They are mechanical facilities in the control of electrics, hydraulic pressure and aerodynamic pressure. Automatic control of mechanical facility has replaced manual work step by step .PLC is a late-model automatic equipment. Its development is based on computer technology, automatization technology and communications. At the present, PLC has become the most important automatic equipment and been applied widely, after the development of 30 years. PLC has hold the primacy in the field of industry automatization(PLC,ROBOT,CADCAM). The degree and extent of PLC development are the symbols of automatic level in one country. Automatic bagging palletizing line is used in the industries of petrochemical, fertilizer, food processing, and transportation port etc. It can perform bagging and palletizing automatically for powder and granular materials such as chemical fertilizer, plastic granules (PP/PE/PVC) and grains etc. It is easy for customers to store, transport and sale their products. Automatic bagging palletizing line consists of auto-weighing bagging machine, auto-bag feed group, sealing system ,bag turn down machine, metal detector, sorting machine, jet printer and palletizing machine etc. units. Through programming controller, the whole system process can be automatic controlled. Any process operation troubles, not enough feeds, bag feedin