Study of control method based on hydromechanics for hydraulic impact of open hydraulic system in concrete pump

According to the working principle of open hydraulic system in concrete pump, and though the theoretical analysis on the phenomenon of hydraulic impact in direction changing process, it concluded that the impact pressure has a linear relation with the displacement of the main oil pump. To solve the hydraulic impact problem, a variable displacement method was proposed. Under the requirement of piston not striking the bottom of cylinder and piston stroke control accuracy, the authors optimized the pumping direction changing process time parameters and the displacement control time parameters. Though the AMESim modeling simulation and experimental study, the variable displacement control method is proved feasible on reducing the hydraulic impact in direction changing process.