In the thesis, mainly introduced the boom, dipper, bucket hydraulic motion related hydraulic principle is introduced, including the hydraulic cylinder and the hydraulic valve design.
在论文当中，主要介绍了动臂、斗杆、铲斗的液压运动相关液压原理介绍，包括液压缸和液压阀的设计。
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It also analyzes stress condition of two important components of the device, dipper handle and boom, supplying load basis for subsequent static analysis.