Hydraulic excavator is the main type of construction machinery, which is widely used in various fields, with large energy consumption. Due to the global energy crisis and the improvement of environmental protection requirements, the energy saving research of hydraulic excavator has become a very urgent topic.
When the excavator is working, the boom carries out frequent lifting movement, in which most of the potential energy is consumed in the form of heat energy in the multi-channel valve port in the process of lowering, which not only wastes energy, but also easily causes the temperature rise of the hydraulic system and reduces the service life of vulnerable parts. The recoverable energy in the process of lowering the boom accounts for about 70% of the recoverable energy of the system, so the research on its energy saving is the energy saving research of the excavator It's an important breakthrough in the development of science and technology.
At present, a lot of research has been done on the energy-saving technology of excavator boom at home and abroad, and some achievements have been achieved. Generally speaking, it can be attributed to two schemes: flow regeneration and potential energy recovery. At present, most of the hydraulic excavator upper boom adopts the flow regeneration circuit to improve the working speed of the working device, improve the composite handling performance, and reduce the energy consumption of the hydraulic system. However, this circuit has large energy loss at the throttle port and low energy utilization rate. With the development of hybrid excavator, the potential energy recovery technology of boom is gradually mature, and potential energy recovery has become an important direction of excavator energy saving development.
