机械5

基于FX1N的液体混料罐控制系统设计 摘要 随着科技的发展，PLC的开发与应用把各国的工业推向自动化、智能化。强大的抗干扰能力使它在工业方面取代了微型计算机，方便的软件编程使他代替了继电器的繁杂连线，灵活、方便，效率高。 本次设计主要是对两种液体混合搅拌机PLC控制系统的设计，在设计中针对控制对象：三只传感器监视容器高、中、低液位，设三电磁阀控制液体A、B输入与混合液体C输出，设搅拌电机M。搅拌机是一种将两种或多种以上材料搅拌混合的系统，对搅拌机的控制，关系到产品的质量，工艺流程是：启动后开阀放出混合液体C，低液位后延时20S放空后关阀，放入液体A经低液位再注入至中液位，关A，放液体B至高液位，关B，启动搅拌电机M，搅60S后停，开阀放出混合液体C，低液位后延时20S放空后关阀，又重复上述过程，要求工作过程中按下停止按纽后搅拌器不立即停止工作，对当前混合操作处理完毕后才停止搅拌器。本设计采用日本三菱公司的FX1N系列PLC以液体混料控制系统为中心，从控制系统的硬件系统组成，软件选用到系统的设计过程（包括设计方案、设计流程、设计要求、梯形图设计、外部连接通信等），旨在对其中的设计及制作过程做简单的介绍和说明。 关键词：液体混料装置，自动控制，PLC，电动机，传感器 LIQUID MIXING TANK FX1N BASED CONTROL SYSTE DESIGN ABSTRACT With the developme
nt of tech
nology, PLC developme
nt a
nd applicatio
n of the i
ndustrial cou
ntries i
nto the automatio
n a
nd i
ntellige
nce.Stro
ng a
nti-i
nterfere
nce ability to make it i
n the i
ndustry replaced the micro-computer to facilitate software programmi
ng to e
nable him to replace the relay of complex co
n
nectio
ns, flexible, co
nve
nie
nt a
nd efficie
nt. The system is mai
nly of two liquids mixi
ng a
nd ble
ndi
ng machi
ne PLC co
ntrol system, for co
ntrolli
ng the object i
n the desig
n: three se
nsors Jia
nshiro
ngqi high, medium a
nd low level, She three sole
noid co
ntrol liquid A, B i
nput a
nd the mixed liquid C output, set stirri
ng motor M. Mixer is a two or more above the mixi
ng material system, o
n the mixer co
ntrol, related to the quality of the product, process is: A post placed i
n the liquid to be i
njected by the low level of liquid level, the releva
nt.A up to high level of liquid B, Gua
n B, start stirri
ng motor M, after mixi
ng 60S stop, ope
n mixed liquid releasevalve C, the low level off after the delay after 20S emptyi
ngvalve, the
n repeat the process, the coursework required.Press the Stop butto
n to stopworki
ng immediately after the mixer is
not o
n the curre
nt operatio
ns have bee
n disposed of to stop mixi
ng ble
nder. This desig
n uses the Japa
nese Mitsubishi compa
ny to liquid mixture FX1N series PLC co
ntrol system for the ce
nter, from the co
ntrol system hardware system compo
ne
nts, software used to the system desig
n process(i
ncludi
ng desig
n, desig
n process, desig
n requireme
nts, ladder desig
n, exter
nal Co
n
nect Commu
nicatio
ns, etc.), aims to desig
n a
nd ma
nufacturi
ng processwhich prese
nts a brief i
ntroductio
n a
nd expla
natio
n. KEY WORDS: liquid mixi
ng equipme
nt, automatic co
ntrol, PLC, motor, se
nsor 目录 前言1 第1章混料罐控制系统方案设计3 1.1方案设计原则3 1.2系统的总体设计要求3 1.3总体结构设计方案4 1.4控制对象分析4 第2章混料罐控制系统的硬件设计6 2.1选择PLC 6 2.2选择接触器7 2.2.1用途8 2.2.2工作条件8 2.2.3结构特征9 2.3选择搅拌电机9 2.3.1功率选择9 2.3.2种类和型式的选择10 2.3.3电压和转速的选择10 2.4小型三极断路器的选择11 2.5液位传感器的选择11 2.6选择电磁阀12 2.6.1入罐液体的选用13 2.6.2出罐液体的选用13 2.7选择热继电器14 2.8 PLC I/O点分配15 2.8.1输入和输出设备及I/O点分配16 2.8.2 PLC的I/O接线图16 2.9主电路的设计16 第3章混料罐控制系统的软件设计18 3.1分析控制要求18 3.2系统状态转移图18 3.3液体混料罐装置状态转移图19 3.4梯形图执行原理分析20 3.4.1初始状态梯形图分析23 3.4.2进液体梯形图分析24 3.4.3混合液体梯形图分析24 3.5系统指令表26 第4章系统常见故障分析及维护27 4.1系统常见故障分析及维护27 4.2系统故障分析及处理27 4.2.1 PLC主机系统故障分析及处理27 4.2.2 PLC的I/O端口系统故障分析及处理28 4.2.3现场控制设备故障分析及处理28 4.3系统抗干扰性的分析和维护29 结论30 谢辞31 参考文献32 外文资料翻译34