Optimization on Control Time Sequence of Double-pump Hydraulic System of Concrete Pump

This research mainly investigates the control time sequence in the open circuit double-pump hydraulic system of the concrete pump. The control time sequence is the electrical signals given to the two pumps and the pilot valves of the two main valves. Under the signals' control, the valves are switched and the flowrate of the two pumps becomes low during the valve switch in order to save energy and reduce the impact pressure. According to the actual hydraulic components, the simulation models about two main hydraulic circuits which are pumping circuit and distributing circuit including directional valves, the pump with the function of constant power control with pressure cut-off and electrical stroke limiter, the two pumping cylinders with cushion structure and distributing structure are developed with software AMESim. On the basis of the two circuits model, an integrated simulation model is developed. Having been validated by the pumping water experiment, the simulation model is used to simulate different control time sequence. Based on the analysis of these simulation results, a proper control time sequence which ensures the pumping system has higher pumping efficiency and longer cylinder stroke is achieved.