目录 摘要 Abstract 第一章绪论1 1.1课题研究的现状1 1.1.1包装机简述1 1.1.2国内外发展现状的分析2 1.2本次设计的内容及目的2 1.2.1本次设计的内容2 1.2.2本次设计的目的3 1.3系统控制的选择比较3 1.4 PLC定义及简述4 1.5 PLC的基本结构组成5 1.6 PLC的发展趋势分析7 第二章控制系统硬件的设计7 2.1包装机控制系统控制的要求7 2.2包装机控制的系统组成8 2.3硬件选型9 2.3.1 PLC选型9 2.3.2限位开关的选型11 2.3.2电子称重装置的选型11 2.4本次系统设计的主要硬件清单12 3包装机控制系统PLC程序的编写12 3.1包装机的控制简述12 3.2绘制控制流程图13 3.3配置I/O表14 3.4接线图14 3.5程序编写15 3.5.1梯形图编写15 3.5.2语句表18 4程序仿真21 4.1环境要求21 4.2程序调式21 致谢24 参考文献25 摘要 随着我国自动化进程的逐步提高，在各行各业的加工过程中逐渐由自动化程度比较高的流水线的作业方式替代传统的人工作业的方式，实现了高度的自动化集成，节约了人力物力成本。在我们的生活中离不开诸如豆奶粉、各类袋装小零食、小袋的颗粒物品等，这类产品在传统的包装作业时，需要大量的物力人力通过工人单一工序完成后搬运到下道工序生产，通常要经过称量、填装、封口等工序，由于人的主观作用的影响下不能完全保证每次包装的质量和数量，而且由于过多的工人参与导致卫生条件不达标，尤其是食用物品的包装，经过与人的接触和作业环境的复杂程度完全不能保证无尘无菌的操作环境，大大降低了包装产品的健康性。本次设计就是针对这一现象设计了一种自动化的包装机，避免过多的人工参与，并大大提高了劳动生产效率。 本次设计了一种针对于粉状或者颗粒状物品的包装机控制系统，采用西门子S7-200小型PLC作为主要的控制元件，通过起保停电路和顺序控制的方式对程序进行编程，模拟包装产品流水化作业的工作原理。通过对硬件和软件的设计，满足现今控制行业对包装机的使用要求。最后对程序进行模拟调试，在不断的调试和修改过程中，使程序更加完美，达到最佳的工作状态。 关键词：包装机控制系统可编程序逻辑控制器自动化包装线 Abstract With the gradual improveme
nt of Chi
na's automatio
n process, i
n the processi
ng of various i
ndustries, the operatio
n mode of the pipeli
ne with higher degree of automatio
n has gradually replaced the traditio
nal ma
nual operatio
n method, achievi
ng a high degree of automatio
n i
ntegratio
n a
nd savi
ng ma
npower a
nd material costs. I
n our lives, we ca
n't leave such thi
ngs as soy milk powder, all ki
nds of small s
nacks i
n bags, small bags of gra
nules, etc. These products require a lot of material a
nd ma
npower to be tra
nsported to the
next road through the si
ngle process of the workers i
n the traditio
nal packagi
ng operatio
n. Process productio
n, usually through weighi
ng, filli
ng, seali
ng a
nd other processes, due to the subjective role of people ca
n
not fully guara
ntee the quality a
nd qua
ntity of each package, a
nd due to excessive worker participatio
n, the sa
nitary co
nditio
ns are
not up to sta
ndard, especially The packagi
ng of edible articles, through the co
ntact with people a
nd the complexity of the worki
ng e
nviro
nme
nt, ca
n
not guara
ntee the dust-free a
nd sterile operati
ng e
nviro
nme
nt, greatly reduci
ng the health of the packaged products. This desig
n is desig
ned to automate the packagi
ng machi
ne for this phe
nome
no
n, avoidi
ng excessive huma
n participatio
n a
nd greatly improvi
ng labor productivity. This desig
n uses Sieme
ns S7-200 small PLC as the mai
n co
ntrol compo
ne
nt, a
nd programs the program by mea
ns of the stop-stop circuit a
nd seque
ntial co
ntrol to simulate the worki
ng pri
nciple of the packagi
ng product flow-through operatio
n. Through the desig
n of hardware a
nd software, it meets the requireme
nts of the packagi
ng machi
ne i
n today's co
ntrol i
ndustry. Fi
nally, the program is simulated a
nd debugged, a
nd the program is perfected a
nd the best worki
ng state is achieved duri
ng the co
nti
nuous debuggi
ng a
nd modificatio
n process. Keywords: packagi
ng machi
ne co
ntrol system programmable logic co
ntroller automated packagi
ng li
ne 第一章绪论 1.1课题研究的现状 1.1.1包装机简述 现今人们对包装行业的需求中对于食用物品的包装要求十分严格，确保食品卫生质量安全可靠，在人们心目中是不可替代的，特别是随着中国居民收入的增加和人民生活的逐步提高，促使包装的发展，包装食品行业也增加了对包装机的要求。食品工业的发展在我国占很大比例，并且每年都在增长。随着食品工业的快速发展，必将推动包装行业的发展，因此包装机械的转型和创新是非常必要的。 包装机目前应用广泛，普遍适用于