Excavator with long arm and rod, can install a variety of working devices excavator, can walk, can rotate, can achieve multi-degree-of-freedom action, can not only cut high vertical wall, but also can excavate deep foundation pit and ditch, is a universal construction machinery, so it has been developed very quickly.
Excavators and hydraulic drives are closely linked. The so-called excavator mainly refers to hydraulic excavator in modern times, hydraulic technology is the technical foundation of excavator, in turn, because of the high requirement of hydraulic technology of excavator, it greatly promotes the development of hydraulic technology. The development of excavator promotes the high pressure, miniaturization and large scale of hydraulic components. Its hydraulic system is the most complex in the hydraulic system of construction machinery. Many advanced technologies of hydraulic transmission are embodied in excavators.
The modern hydraulic excavator has complex operation and complete function, which requires multi-function multi-way valve and complex control hydraulic pump. The pump, valve and motor should be controlled electronically. The development of excavator makes the initial individual control of each hydraulic element develop to intelligent integrated control. Advanced hydraulic excavators are called civil mechanics and are representatives of construction robots.