Retractable spring swing wing thrust increasing device for ship and design method

The invention relates to the technical field of ship energy conservation, in particular to a retractable spring swing wing thrust increasing device for a ship and a design method.The swing wing thrust increasing device comprises a barrel, a driving motor, a hydrofoil assembly and a transmission system, and the hydrofoil assembly comprises a supporting frame, a swing wing and a spring; the transmission system comprises a driving gear, a driven gear, counter-rotating shafts, counter-rotating gears and bearings, the lower end of the interior of the barrel is rotationally connected with the two vertical counter-rotating shafts through the bearings, the lower portions of the two counter-rotating shafts are fixedly connected with the counter-rotating gears respectively, the counter-rotating shaft above one counter-rotating gear is connected with the driven gear, and the counter-rotating shaft above the other counter-rotating gear is connected with the bearing. The driven gear is meshed with a driving gear in the ba