A heavy-duty anti-wear H-series right angle gearbox is used to drive a vertical long shaft semi submersible turbine return water pump, which solves the core pain points of traditional direct drive in high slag content, strong impact, and multi dust mining conditions, such as limited space, rapid component wear, and axial thrust overload. It achieves long-term continuous and stable operation of the tailings pond return water system and completely avoids the major safety risks of dam failure caused by tailings pond drainage failure.