It is a kind of heavy engineering machinery widely used in construction, mining, road construction and other fields. It is mainly used for digging soil, sand, coal and other bulk materials, and can also be used for crushing, grabbing and carrying heavy objects. It is composed of key components such as power system, working device, slewing mechanism, walking mechanism and operating system. The working device includes a boom, an arm and a bucket, which is driven by a hydraulic system to realize various functions such as digging, loading, and leveling. Usually equipped with high-performance diesel engines to provide strong power, while using advanced hydraulic systems and electronic control systems to improve work efficiency and operating comfort.