Hydraulic Excavator Arm Potential Energy Recovery System Design

Energy recovery is an effective method to save energy for hydraulic excavator. Based on the analysis of current energy recovery, a system of the boom potential recovery has been proposed in this paper. The system scheme has been designed, and the parameter matching method has been studied. A simulation model has been established using AMESim software. A simulation research about the system of the boom potential recovery has been carried out. The main work of this paper is summarized in the following:1. A system of the hydraulic excavator boom potential recovery is proposed. The system scheme is designed, and the system working principle is analyzed. The accumulator of the system stores potential energy from construction of boom hydraulic cylinder through energy recovery. Then the generator generates electricity by driving the hydraulic motor using the energy saved in the accumulator. Hydraulic excavator boom potential recovery is accomplished. The system control method is designed and the principle diagram of the hydraulic system is sketched.2. The match of parameter in the hydraulic system of energy recovery has been analyzed and discussed in this text. A hydraulic excavator working simulation model is established and simulated under AMESim by using the hydraulic component library and the planar mechanism library. The simulation result shows that the model simulated hydraulic excavator cycling process efficiently and provides standard for the system of boom potential recovery. According to the simulation to obtain the working conditions of hydraulic excavators, combined with the characteristics of various parts of the system, the energy recovery system parameters match goal is determined. The parameter matching methods of the accumulator, the hydraulic motor and proportional control valve have been established and the specific parameters and model have been selected. Parameter matching meets the needs of the system condition, achieve the match of energy recovery system and the external load, and improve the efficiency of the system.3. According to the energy simulation model and the pressure of boom hydraulic cylinder by simulation research of excavator, the energy recovery system is simulated. The effect of accumulator volume, accumulator inflation pressure, the flow rate of proportional control valve, and the displacement of hydraulic motor are analyzed. A method of using PID controller to control the displacement of hydraulic motor is proposed. By PID controlling, the output speed of the motor is consistent in high efficiency domain of the generator, so the entire efficiency of system energy recycle is improved. According to the simulation results, all causations of energy wasting are analyzed.4. The process of accumulator energy recovery is test, in order to review the process of hydraulic cylinder piston rod pressing hydraulic fluid into the accumulator under different pressure. The experimental data and the simulation results are compared, and the accuracy and reliability of the method of building simulation model is verified.