In today's energy shortage, it is of great significance to reduce energy consumption, deal with the energy crisis and Research on energy saving. For the hydraulic system, the application of energy-saving technology can reduce the installed capacity and system operation cost, avoid the oil viscosity decline caused by high oil temperature, thermal expansion and affect the life and performance of hydraulic components. In the hydraulic system, energy recovery is one of the important ways to save energy, and with the help of auxiliary equipment to achieve energy reuse is one of the methods of energy recovery. Accumulator is an important auxiliary component of the hydraulic system, which can recover the excess energy in the hydraulic system and release it when needed, so as to achieve the effect of energy saving.
The energy consumption of hydraulic excavator is large, and the total utilization rate of energy is only about 20%. In all the working cycles of hydraulic excavator, the rotary motion accounts for 50% ~ 70% of the whole working cycle time of hydraulic excavator, the energy loss of rotary motion accounts for 25% ~ 40%, and the calorific value accounts for 35% ~ 40% of the total calorific value of the system. It can be seen that the research on energy recovery of rotary hydraulic system of hydraulic excavator is of great significance.
