Concrete Wet Spraying Machine Pumping The Hydraulic Control System Features

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.