Study On Mechanism Of Hydraulic Impact And Pulsation In Wet Spraying Machine

Wet spraying machine is a kind of construction machinery widely used in concrete construction, that can once finish competence transporting and vertical transportation in succession, with high efficiency, low workforce and expenses. The hydraulic pressure system is one of the most important components in the wet spraying machine, the design not merely having very great influence on technical feature of wet spraying machine, but also is essential to the security and dependability of working to the wet spraying machine complete machine. The directional shift system of the wet spraying machine must complete S tube's shift operation in very short time, which may cause hydraulic impact at the same time during the operation. The hydraulic impact not only results in noises and vibration but also reduces the equipment's life time. So speaking from this meaning, it is necessary to research the hydraulic impact in wet spraying machine and find method to reduce the hydraulic impact.On the basis of experiment with the sample of wet spraying machine, the hydraulic impact and pulsation in wet spraying machine is researched in this paper. Firstly, the paper expatiated the harm to wet spraying machine and influence on the quality of project, and put forward the modification scheme for hydraulic system. Pumping process and the course of electricity and liquid changes were analyzed in detail in this paper. The cause of hydraulic impact and pulsation (pumping rate and the response time of dividing system does not match) was found out. Furthermore, the paper analyzed the flowing state of concrete in conduit by rheology principle and dynamics of dividing system, and established the pumping load and switching load of wet spraying machine. Finally, it set up the complete mathematical model of pumping system and dividing system with the widely used software Matlab/Simulink. The displacement of the rod piston and the impact of hydraulic are analyzed in different input flow and different reversing time. And the reliability of theory analysis is further verified.