The Research Of Synchronous Control In The Multi-cylinder System Of Step-by-step Scaffold

Hydraulic step-by-step scaffold is a new type of construction equipment. With the rapid development of China's economy, the scale of our city is expanding. And there are more and more high-rise buildings around us. So the amount of auto-lifting scaffold was increasing demanded. The former synchronization system of the hydraulic step-by-step scaffold was a simple synchronous cylinder, the synchronization accuracy of which was low and the expansibility was not yet enough.On the basis of consulting a vast amount of document and material of scaffold, the paper makes a deep analysis of traditional scaffold system and improves original hydraulic synchronization system, combined with the projects of scaffold transform by Wuhan Mingzheng Outer Scaffold Engineering Limited Corporation. Specifically the paper designed an electro-hydraulic proportional control system with position feedback function. The system used a fuzzy adaptive PID controller, and which plays a significant role of improving the synchronization accuracy. So the synchronous lifting can meet the different load cases.This paper includes four aspects:In chapter 1, the development course and research actuality of the hydraulic synchronization system home and abroad are summarized. The significance is referred and the main research subjects are outlined.In chapter 2, the hydraulic system is designed. The principle project's selection and design of hydraulic system are made at length. Hydraulic structural design, component's selection are presented. Analyses the work process of hydraulic system, such as the electromagnetism valve action sequence, process of scaffold climbing and etc.In chapter 3, simulative models of hydraulic system and load are set up by using AMESim. According to simulation result and experimental data, lifting displace can be controlled effectively.In chapter 4, control system is designed. In order to solve that the load of scaffold is time-varying, a fuzzy adaptive PID controller is selected. The principle and the impact on the control system are summarized, and then the control system simulation model is established by using AMESim and MATLAB/Simulink. According to the results, fuzzy adaptive PID control has good control characteristics and has precise synchronization accuracy.The synchronous control system we designed has better synchronization and Scalability. The performance can meet the needs of the scaffold construction in new times, and it will has a broad market prospect.