Due to the wide working range of excavators, about 65 ~ 70% of the earthwork in the world is completed by excavators, which makes excavators widely used in all kinds of engineering construction. However, due to the large quality of the front-end working device of the excavator, when the boom drops, not only the energy loss will be caused, but also the lost energy will be converted into the internal energy of the hydraulic oil in the hydraulic system, resulting in the increase of the hydraulic oil temperature, which seriously affects the working efficiency and service life of the excavator. The high oil consumption and poor exhaust quality of excavators have aroused widespread concern in the industry.
The hydraulic system has a large space for energy saving. The common energy consumption of hydraulic system is analyzed in the following aspects
1. Overflow loss. Overflow phenomenon in large hydraulic excavator system generally occurs under overload condition, when the output pressure of the pump exceeds the set pressure of the safety valve, the hydraulic system will overflow.
2. Loss along the way. The pressure loss along the pipeline is mainly caused by viscous friction, which is inevitable. However, the pressure loss along the pipeline can be reduced by selecting appropriate materials and optimizing the design of pipeline.
3. Matching loss. Due to the rapid load change in the working process of excavator, especially in the case of small load and high speed, it is not easy to match, so we can only design a new type of fast response circuit, such as load sensing system.
4. Loss of kinetic energy and potential energy. The loss of kinetic energy and potential energy is mainly reflected in the working process of the boom and stick of the hydraulic excavator, especially the boom of the large hydraulic excavator has large mass and considerable energy saving effect.
