3 results about "Stern" patented technology

The invention discloses a full-revolving tugboat with a stern roller. The full-revolving tugboat with the stern roller comprises a boat body, a water distribution hammer, a full-revolving propeller, a crank arm telescopic crane and a towing engine, wherein the water distribution hammer is arranged at the center of the bottom of the boat body and is through longitudinally, the full-revolving propeller is positioned below a stern, the crank arm telescopic crane is arranged on a cabin of the boat body, the towing engine is arranged in the middle of a deck of the boat body, the stern roller is arranged in the middle of the stern, and rope blocking devices are arranged on two sides of the stern. When the full-revolving tugboat tows an oil platform or underwater anchor chain, one end of a steel wire rope on the towing engine is connected with the oil platform or underwater anchor chain under the guide of the stern roller. The stern roller having a guide function is additionally arranged in the middle of the stern, therefore, the structure is simple, the operation is convenient, and the application range of the full-revolving tugboat is enlarged. The stern roller is arranged on the inner side of a rubber fender of the stern, therefore, rigid collision between the stern roller and other objects is avoided, and the rope blocking devices can prevent the steel wire rope from sliding to the stern to damage the boat structure when the boat swerves.

The invention relates to a LNG gas ventilation mast for a ro-ro passenger ship, which comprises a barrel, a first ventilation pipe and a second ventilation pipe, and the barrel inclines towards the stern direction and is fixedly installed on an exposed deck and provided with a first channel and a second channel which are spaced from each other and extend in the length direction. The top of the first channel and the top of the second channel are provided with a ventilation net and a rainproof cover, the first channel is divided into a plurality of cavities which are separated from one another, the size of the cavities is in positive correlation with the caliber of the first ventilation pipe, the caliber of the second ventilation pipe is smaller than that of the first ventilation pipe, and the diameter of the second ventilation pipe is smaller than that of the second ventilation pipe. The first vent pipe penetrates out of the exposed deck and then extends by a preset length in the cavity, and the second vent pipe penetrates out of the exposed deck and then extends to the top in the second channel. The internal structure is reasonably divided, the structure is compact, the occupied space is small, and functionality and attractiveness are both considered.