挖沙船挖掘臂分為整體式和分體式兩種，整體式是直接跟動力主架驅動四角輪鏈接的，分體式是動力主架與船體以45°支撐點鏈接的。一般情況下水下采挖深度達到12米以下才會使用分體式挖掘臂。

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點1.水下沙石料有土層 2.沙石料板結 3.水下挖掘臂設計不合理。