Working state analysis and hydraulic system design for excavator

Excavator is a kind of multifunctional build-construction machine, which is widely used. Its working condition is bad and its working state is complicated. Hydraulic system is its kernel parts, which plays a very important role to the capability of an excavator. On the basis of analysis excavator's usual working state, we made a detailed analysis about some particular working states and hydraulic systems, after that, we make a comprehensive conclusion about the design requirements of an excavator. According to the analysis of the design requirements for the hydraulic system, this thesis integrates loading sensing and electric control and any other technologies, designs a new kind hydraulic system of excavator, promotes the function of energy-saving and manipulative characteristics more.