In Plastic Spatial Blow Molding Machine Electro-hydraulic Proportion Position Control System Research

The plastic blow molding machine is the use crowds blows takes shape the craft to produce in the plastic the spatial vessel special-purpose,the highly effective equipment。The application which the plastic blow molding takes shape is day by day wide spread。Has become develops the quickest one kind of plastic to take shape the method,so that in the overwhelming majority the spatial plastic product all uses squeezes out the blow molding processing method toobtain。But squeezes out the blow molding to take shape the prominent shortcoming is squeezes out the blow molding to take shape the product wall thickness uniformity not to be easy to control,especially regarding large-scale shape complex product。For this reason, in the course of blowing molding in the plastics emptily, the base wall of the type controls one of the key technology that is the product quality of a relation thick。Its operation principle is to utilize electric liquid position control principle to change and push out of the opening degree of shaping interval of a mould,in order to the change law of the controlling type base thickness, the wall of the empty products is thick and even in making, save materials。This text, through analyzing the scheme of the empty shaping type base control system in the plastics, design adopt electric liquid proportion type base wall thick control system of position control and utilize Matlab-Simulink carry on systematic emulation and analyze, correct PID finally。This article mainly includes following several parts:Chapter1:Survey plastics empty shaping machine crowd technology of blowing, make an introduction to type base wall thick domestic and international research current situation and development trend that control. Have proposed the research meaning of the thesis and ground work of thesis on this basis。Chapter2:Introduce plastics empty method and simple introduction of shaping push empty shaping machine blow molding, out of blow molding。Chapter3:Propose in the course of blowing molding in the plastics emptily, the base wall of the type controls one of the key technology that is the product quality of a relation thick. And has analyzed the thick control system of base wall of the type。 Chapter4:Through the empty technological process of taking shape while analyzing large-scaly,have designed the hydraulic control system of the empty taking shape machine in the plastics。Utilize hydraulic pressure urge, realize automatic work cycle of complete machine convenient, reliable very。Chapter5:According to the position control system principle of the electric liquid proportion, have set up systematic mathematical model。Through setting up artificial model,utilize Matlab-Simulink to carry on systematic emulation and analysis。Chapter6:PID control and Correct analysis。...