Shandong Junda Vocational Skills Training School. Shandong Junda Vocational Skills Training School, founded in 1999, has the advantages of convenient enrollment, good training effect and low price. Excavators, also known as excavators, are developed on the basis of mechanical transmission excavators. It uses a bucket to excavate materials above or below the bearing surface, and loads them into transport vehicles or unloads them to the stockyard. The excavated materials are mainly soil, coal, silt and pre-loosened rocks and minerals, which are mainly used for modern engineering construction.