With the rapid development of social infrastructure, excavator plays an increasingly important role in earthwork construction. Because in the working process, the excavator boom is reciprocating motion, which needs frequent braking and lifting, and it is a work device with more energy consumption, so the recovery of boom energy is an important direction of excavator energy saving. Most hybrid excavators with energy recovery system take the recovery of boom potential energy.
The boom energy recovery system needs a lot of experimental research before it can be used in practice. However, in the experimental process of the boom energy recovery system, there are some problems that are difficult to implement. For example, the boom hydraulic cylinder is difficult to install in the laboratory due to its long length and heavy quality. In the process of telescopic work, the boom needs a large three-dimensional space. Because the load is too large, it is difficult to load the load, and there is a big security problem.
Due to the heavy weight and large inertia of the front-end working device of the hydraulic excavator, in the process of lowering the boom, the gravitational potential energy and most of the kinetic energy of the working device are converted into heat energy at the throttle of the main valve, which not only causes a huge waste of energy, but also increases the oil temperature and accelerates the damage of the hydraulic parts. Through the energy recovery in the process of lowering the boom, these problems can be effectively solved, and the stable and efficient operation of the hydraulic system can be ensured.
