螺旋桨是轮船的推进器,一旦被杂物缠绕,船就会越行越慢,甚至停滞不前。我想设计一种由安全罩和刀片组成的防缠绕安全装置。安全罩呈圆锥形,小的那端与船体后部固定,大的那端能罩住整个螺旋桨。刀片装 Propeller is a ship’s propeller, once the debris winding, the ship will be slower and slower, or even stagnant. I want to design an anti-wrap safety device consisting of a safety cover and a blade. The safety cover is conical, the smaller end is fixed to the rear of the hull, and the larger end covers the entire propeller. Blade installed