挖沙船挖掘臂分为整体式和分体式两种，整体式是直接跟动力主架驱动四角轮链接的，分体式是动力主架与船体以45°支撑点链接的。一般情况下水下采挖深度达到12米以下才会使用分体式挖掘臂。

The dredging mining arm is divided into integrated and separated two kinds of integral is directly with the power of the main drive wheel frame four angle link, split power is the main frame and the hull with 45 degree support link. In general, the sub - type mining arm will be used when the depth of underwater mining is below 12 meters.

挖沙船水下挖掘臂挖不下去的主要原因有三点1.水下沙石料有土层 2.沙石料板结 3.水下挖掘臂设计不合理。