Excavator Hydraulic Vibration Energy Recovery System And Piezoelectric Conversion Structure Design

With the large number of applications of hydraulic excavators in engineering construction,the energy waste and environmental pollution problems caused by the high hydraulic fuel consumption and poor discharge characteristics of hydraulic excavators have become increasingly prominent,which makes that the issue of energy saving and loss of hydraulic excavators a hot topic of research.The waste of energy generated by the boom and rotary system of the hydraulic excavator occupies more than half of the entire energy loss and has great potential for reuse.At present,the energy-saving research of excavators is mainly focused on energy recovery and utilization and the improvement of hydraulic systems.There are many links in recycling and reuse,and the process is complex.Therefore,this paper based on the combination application of piezoelectric technology and hydraulic technology,whose proposes a new energy recovery method combines the accumulator and the piezoelectric transducer.The design of energy recovery system scheme of hydraulic excavator was studied.Different piezoelectric structure types were designed which determine that the circular piezoelectric conversion structure device and connection method.The working condition characteristics and energy loss of the hydraulic excavator are analyzed,which is established that the hydraulic excavator boom lowering and rotating system brake is used as the hydraulic energy recovery object.On the basis of comparing the energy recovery methods of existing hydraulic systems,a new energy recovery conversion method is proposed,which combines the potential energy of the boom and the inertial energy of the rotary device with the piezoelectric.The efficiency of the brake energy recovery of the boom lowering and rotating system of the hydraulic excavator is studied.A mathematical model of the hydraulic components in the oil recovery hydraulic system was established.The parameters of the hydraulic components were determined by combining the working conditions of the system and the working pressure.The energy recovery hydraulic model of the boom energy and the rotational inertia energy was established by AMESIM and the component parameters in the model were selected.The simulation of the system model is performed.The simulation results show that the hydraulic energy system of the boom can achieve energy recovery of 87.7%,and the energy loss of the rotary device achieves recovery of 36.47%.The study shows that the hydraulic recovery system scheme is feasible.The structure optimization design of the piezoelectric conversion structure device built in the hydraulic system is studied.Through the simulation and analysis of the structural model parameters in ANSYS,it is found that the electric energy generated by the piezoelectric vibrator is different under different radius ratios and thickness ratios.With the increase of the radius ratio?thickness ratio?,the electric energy has gradually increased.When the parameters are selected differently,it will affect the optimal power.By studying the variation rule of electric energy under different radius ratio?thickness ratio?,the maximum electric energy can be obtained,which is 3.625?10^-5J,with the optimal radius ratio and thickness ratio of the piezoelectric vibrator under the back pressure of a certain system.It shows that the piezoelectric transformation structure can achieve the rapid recovery and transformation of hydraulic vibration energy in the hydraulic recovery system.