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Excavator, also known as excavation machinery, also known as excavator, is a bucket to dig above or below the bearing surface of the material, and loaded into transport vehicles or unloading to the stacking field of earthwork machinery. The materials excavated by the excavator are mainly soil, coal, sediment, and the pre-loosened soil and rock. From the development of construction machinery in recent years, the development of excavator is relatively fast, excavator has become one of the most important construction machinery in engineering construction. The three most important parameters of the excavator are: operating weight (mass), engine power and bucket capacity.