自装式混凝土搅拌车液压传动及控制系统研究与仿真
[Abstract]:Concrete plays an important role in the development of the national economy and has been attached great importance to by the government construction department, thus promoting the development of concrete production technology to a fairly mature stage. And the transportation of concrete has also made great progress. The self-loading concrete mixer has been introduced into China only in recent years as an engineering building equipment, and has a broad prospect of development. In this paper, the characteristics, application and development trend of self-loading concrete mixer at home and abroad are studied in detail, and the research background and significance of self-loading concrete mixer are expounded. According to the application and working requirements of the hydraulic system, the hydraulic transmission system design, hydraulic control system research, modeling and simulation of the hydraulic transmission system of the self-loading concrete mixer are carried out in this paper. The design of hydraulic transmission system is based on the basic structure and basic operation principle of self-loading concrete mixer, according to the requirements of actual working condition, the reason of hydraulic impact and the preventive measures. The operating principle diagram of self-loading concrete mixer is analyzed. A closed loop is used in the stirring system, an open loop is used in the bucket part and an open loop is used in the rotary part. In order to enhance and ensure the performance of the system, electro-hydraulic proportional valve is used in the mixing system. Then, according to the working pressure of all kinds of systems in the actual work, the working pressure of this subject is chosen, and then the flow rate and power of the system are calculated from the driving power of the mixing drum, and according to the conventional formula of calculating the hydraulic system, The selection of each component in the system is checked and calculated. The hydraulic control system of self-loading concrete mixer mainly includes constant speed control and rotary limit control. According to the control target requirement of hydraulic transmission system, the whole control flow diagram is finalised, then the control circuit of solenoid commutation valve is analyzed and studied, secondly, the displacement control system of hydraulic pump is analyzed and discussed. The mathematical model of the control system is established. On the basis of hydraulic system design, according to the established mathematical model of speed control system, The hydraulic system simulation software AMESim is used to model and simulate the rotary drive system and the stirring drive system of the self-loading concrete mixer, and the curves of the operating parameters of each part of the working elements under various working conditions are obtained. According to the calculation and hydraulic simulation analysis, the operation of hydraulic system is relatively stable and reliable. The hydraulic impact in the system is larger when the working conditions are switched, which is more common in the hydraulic system. Selecting the appropriate hydraulic components can effectively alleviate the hydraulic impact. The hydraulic transmission and control system is an important part of the self-loading concrete mixer. The analysis of each part of the system can provide parameters for the optimization of the whole vehicle and improve the service life of the vehicle. Finally, the paper summarizes the research work of this paper, and points out the shortcomings of the paper and the next step of the research.
【学位授予单位】:济南大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:TU642
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