What imported equipment do shipyards usually use?

The main facilities and equipment of the shipyard include portal crane, dock pump house, dock door, cold working equipment, machining equipment, transportation equipment and shaft rudder drilling equipment. The equipment on board includes main engine, auxiliary engine, oil separator, air conditioning and refrigeration equipment and hydraulic equipment. The above-mentioned equipment used to be mainly imported, but now it can be manufactured by itself or with foreign patents; The large three-star plate bender, multi-head plasma CNC cutting machine, large hydraulic lifting flat car and aerial work car are basically imported; Diesel generator set, refrigeration compressor set, hatch cover, steering gear and other ship equipment are basically imported, and cranes are mostly imported. The mainframe is mainly made in China and patented abroad.