机械5

基于PLC的液压混凝土输送泵电气控制系统设计 摘要 混凝土泵是通过专用管道依靠压力输送符合施工和泵送条件的混凝土到施工现场的建筑施工机械，它能一次连续地完成水平输送和垂直输送，具有高效的工作效率和方便的移动功能。本文在深入地分析和研究混凝土泵控制系统的功能和要求后，采用PLC对混凝土输送泵电气控制系统进行设计，控制三台异步电动机分别实现混凝土输送泵的主油泵电机和风冷电机启停控制以及系统的润滑工作；通过控制其液压系统中的电磁换向阀的通断，实现使液压系统驱动泵的正泵、反泵运行；主油缸前进、后退控制及点动等控制。在实现近程、远程控制的同时，并对控制系统实现了一种S管的摆动和主油缸的动作实行“步步到位”的新型控制模式。实践证明，基于PLC的混凝土输送泵电气控制系统提高了系统工作效率，具有良好的工程应用价值。 关键词：PLC；混凝土泵；程序控制 Desig
n of Electrical Co
ntrol System For Hydraulic Crete Delivery Pump Based o
n PLC ABSTRACT The co
ncrete pump is a buildi
ng co
nstructio
n machi
nery through a dedicated pipeli
ne to tra
nsmissio
n co
ncrete meet the co
nstructio
n a
nd pumpi
ng co
nditio
ns to the co
nstructio
n site rely o
n pressure, it ca
n tra
nsport the co
ncrete with horizo
ntal a
nd vertical co
nti
nuously, with high efficie
ncy a
nd co
nve
nie
nt mobility features. This paper u
nder detailed a
nalysis a
nd research of fu
nctio
ns a
nd requireme
nts of the co
ncrete pump co
ntrol system, use PLC to desig
n the co
ncrete pump electrical co
ntrol system, co
ntrol three asy
nchro
nous motor to respectively realize o
n off co
ntrol of the oil pump motor a
nd air-cooled motor of co
ncrete pump a
nd the lubricatio
n of system; By co
ntrolli
ng the electromag
netic valve o
n-off of hydraulic system, realize to maki
ng the drive pump of hydraulic system positive pump a
nd
negative pump ru
n; forward co
ntrol a
nd back co
ntrol of the master cyli
nder, a
nd jog a
nd other co
ntrols. While short-ra
nge a
nd remote co
ntrolli
ng, realize a
new co
ntrol mode to the co
ntrol system that a
n S pipe swi
ng a
nd master cyli
nder moves to impleme
nt step by step i
n place. It is proved that the desig
n of hydraulic co
ncrete pump electrical co
ntrol system based o
n PLC improve the efficie
ncy of the system, it has a good value of e
ngi
neeri
ng applicatio
ns. Key words PLC; Co
ncrete pump; Program co
ntrol 目录 1绪论1 1.1课题意义及目的1 1.2国内外研究现状1 2控制系统设计方案及论证3 2.1继电器控制系统3 2.2单片机控制系统3 2.3 PLC控制系统4 3系统硬件设计5 3.1混凝土输送泵原理5 3.2 PLC工作原理6 3.2.1 PLC的基本概念6 3.2.2 PLC的基本结构7 3.2.3 PLC的工作原理8 3.3总控制线路及IO地址分配9 4系统软件设计12 4.1 PLC程序设计12 4.1.1电机Y-△换接启动及停机控制12 4.1.2正泵运行和反泵运行控制13 4.1.3主油缸前进点动、后退点动控制14 4.1.4搅拌轴液压马达正反转的自动控制14 4.1.5主油缸液压系统的加载和卸载控制15 4.1.6 S管摆阀“步步到位”的控制15 4.1.7远控急停控制16 4.2系统调试17 5总结与展望18 参考文献19 致谢20 附录A程序梯形图21 附录B语句表23