Research On Energy Regeneration Of Excavator Boom Based On Constant Pressure Accumulator

Construction machinery has the problems of high fuel consumption,low energy efficiency and heavy load.With the proposal of China’s "13th Five-Year Plan" and "Made in China 2025" action program,energy conservation and emission reduction have become the primary goal of the construction machinery industry,and the production and development of green,efficient,low consumption and low carbon engineering equipment has become an industry trend.Construction machinery because of its working characteristics,hydraulic system has a large amount of energy waste.Storage and reuse of recoverable energy is an important means to save energy and reduce consumption of construction machinery,which helps to promote the green and sustainable development of the industry.Aiming at the potential energy of lifting mechanism of construction machinery,the boom of hydraulic excavator is chosen as the research target.A method of "pump-controlled drive + energy regeneration" is proposed,which uses the secondary component--four distribution window axial piston motor and variable area constant pressure accumulator.Firstly,mathematical modeling of the proposed hydraulic pump-controlled energy regeneration system is completed,and the design idea and derivation process of the variable area constant pressure accumulator are emphasized.Secondly,a certain type of hydraulic excavator is taken as an example,its energy consumption characteristics are obtained through mechanical-hydraulic co-simulation.Thirdly,to highlight the contrast of the study,the energy storage element of the pump control system was changed to the air bag hydraulic accumulator,and the modified pump control system was defined as the air bag group and the original pump control system as the constant pressure group.According to the structure and parameters of the sample,the parameter design and optimization of the two groups of pumps are completed.Fourthly,the AMESim simulation model of the hydraulic system is established,and the working parameters are set.The simulation results show that the model is reasonable.Under the set working conditions,the energy storage density of the variable area constant pressure accumulator is 5.048 k J/L,the energy storage efficiency is75.99%,and the energy regeneration efficiency of the system is 58.54%.The energy storage density and energy storage efficiency of the air bag hydraulic accumulator is 2.169 k J/L and 55.56%,and the energy regeneration efficiency of the system is 31.69%.The energy storage density of the constant pressure accumulator is 2.327 times that of the air bag hydraulic accumulator,the energy storage efficiency is increased by 20.43%,and the working efficiency of the system is increased by 26.85%.In conclusion,the system proposed in this paper can effectively recover the boom potential energy of the hydraulic excavator,reduce the working energy consumption of the whole machine,and the energy storage capacity of the variable area constant pressure accumulator is significantly better than that of the air bag accumulator.