The working device of hydraulic excavator is a construction tool directly used for excavation. It uses the hydraulic cylinder expansion to complete the boom lifting, stick push-pull and bucket rotation. Its action is close to the movement of human wrist, and has greater excavation force and better operation performance. The most commonly used working devices of hydraulic excavator are backhoe and front shovel. At the same time, they can also be replaced with lifting, grab, loading, loosening, drilling, crushing and other working devices.
