Research On Starting Characteristic And Energy-saving Of Large-sized Hydraulic Excavator Slew System

ABSTRACT:Slew system is one of the important sub-systems of hydraulic excavator, the performance of which directly affects property of the whole system. For large-sized hydraulic excavator, the slew system has typical characteristics of large inertia load system. With the high quality of the entire machine and high load, its starting characteristic tends to be bad. A deep study was made on the slew system of large-sized hydraulic excavator from the overflow when starting, and an effective method was provided to improve its energy-saving performance. The main works are as follows.The general law of slew platform motion, the loading characteristics of the slew system and the flow distribution characteristics of the slewing and boom hydraulic circuit were theoretically analyzed.The co-simulation model was built by hydraulic analysis software AMESim and dynamic analysis software ADAMS, and then was verified through experiments. Through co-simulation about slewing starting characteristics, the effect of slew platform’s moment of inertia, friction torque, motor displacement, gear ratio and the setting pressure of swing relief valve were analyzed, and the main cause of over-large overflow losses was founded.Optimization method of slewing cutting-off overflow control circuit was provided to reduce the starting overflow losses. The co-simulation model of optimization program was built to analyze the starting characteristics of180degree rotation single action, slewing and boom dropping compound action. Compared with the original program, the swing cutting-off overflow control circuit in the optimization method would not change the starting characteristic, and has a positive energy-saving effect.