混凝土湿喷机泵送液压控制系统特性研究

【作者】 周现奇；

【导师】 吴万荣；

【作者基本信息】 中南大学 ， 机械电子工程， 2011， 硕士

【摘要】 混凝土湿喷机是一种广泛应用于喷锚支护工程领域的工程设备,泵送液压控制系统是决定混凝土湿喷机性能的关键因素之一,现有的湿喷机泵送液压系统不能满足泵送油缸换向时的流量要求,同时存在泵送油缸换向液压冲击过大的问题。本文在设计了湿喷机泵送液压系统的基础上,对泵送控制液压系统进行了详细的液压回路分析、系统数学建模、仿真分析和实验验证。首先,文章在设计了混凝土湿喷机闭式泵送液压系统的基础上,就如何匹配泵送换向时泵送油缸所需的流量进行了详细的液压回路分析,针对泵送液压系统换向液压冲击问题,提出了减小换向液压冲击的“SN”控制方法。其次,建立了混凝土湿喷机泵送液压控制系统的数学模型,通过Matlab/Simulink的仿真,分析了液压系统开环传递函数的稳定性并进行了Ziegler-Nichols参数整定；利用AMEsim仿真软件搭建了混凝土湿喷机泵送液压控制系统仿真模型、泵送混凝土负载模型,对整个液压系统进行仿真,研究了不同液压系统参数和系统采用“SN”控制对泵送油缸换向液压冲击压力的影响,提出了减小泵送换向液压冲击的方法。最后,在混凝土湿喷机实验样机上进行了实验研究,通过对比泵送液压系统在不带“SN”和带有“SN”控制的实验结果,验证了设计的湿喷机泵送混凝土时能够满足其流量要求,而且采用“SN”控制能够明显减小泵送换向时的液压冲击。更多还原

【Abstract】 Concrete wet spraying machine is one kind of widely engineering equipment used in anchoring engineering field. The hydraulic pump control system is one of the key points of concrete wet spraying machine. However, the concrete wet spraying machine exists the problems of how to match the flow requirement and the excessive hydraulic shock in the construction process when the pump cylinders turning the direction. On the basis of designing the pump hydraulic system of wet spraying machine, the paper did a detailed circuit analysis on the hydraulic pump control system, system mathematical modeling, AMEsim simulation analysis and experimental demonstration.Firstly, on the bases of designing the closed hydraulic system of concrete wet spraying machine, the paper did a detailed circuit analysis on how to match the pumping cylinders flow requirement when the pump turning the direction; for the problem of excessive hydraulic shock, the paper proposed the "SN" control method to reduce the impact of hydraulic shocks.Secondly, establishing the mathematical model of pump hydraulic control system of wet concrete spraying machine, by Matlab/Simulink simulation, it did analysis of the stability of the open-loop transfer function of the hydraulic system and Ziegler-Nichols tuning; the AMEsim simulation software has been used to build the simulation model of the concrete pumping hydraulic control system and the pumping concrete load simulation model, it did the simulation of the entire hydraulic system. The simulation results verify the hydraulic pumping system can meets the changing requirements of the flow of hydraulic pumping cylinders, while comparing the simulation results, it did the analysis of impacts of different system parameters and the system using "SN" Control method to the excessive hydraulic shock, and the paper proposed methods to reduce the hydraulic shock.Finally, it carried out experimental study in the wet concrete spraying machine, by comparing the experiment results of two different experimental conditions of hydraulic pumping system without the "SN" and with "SN" control, it verifies the wet spraying machine can meet the flow requirements of the pumping cylinders, and the use of "SN" control can significantly reduce the hydraulic shock.更多还原