Nozzle device for plant protection unmanned aerial vehicle and droplet diameter control method thereof

A nozzle device for a plant protection unmanned aerial vehicle, comprising a flexible nozzle body, a magnetostrictive sleeve, and a coil, wherein the flexible nozzle body is provided with a nozzle exit, a periphery of the flexible nozzle body is provided with a guide surface at a position corresponding to the nozzle exit, the magnetostrictive sleeve is sleeved on the periphery of the flexible nozzle body and abutted against the guide surface, the coil is wound around the periphery of the magnetostrictive sleeve;

• when the coil is supplied with a current, the magnetostrictive sleeve is movable relative to the guide surface to adjust a size of the nozzle exit of the flexible nozzle body;
• a free end of the magnetostrictive sleeve is abutted against the guide surface, when the free end of the magnetostrictive sleeve moves relative to the guide surface in a first direction, the size of the nozzle exit of the flexible nozzle body becomes smaller, and when the free end of the magnetostrictive sleeve moves relative to the guide surface in a second direction, the size of the nozzle exit of the flexible nozzle body becomes larger, and the first direction is opposite to the second direction;
• the magnetostrictive sleeve is a hollow cylinder, and an inner side edge of the hollow cylinder is abutted against the guide surface;
• a cross section of the guide surface is in a shape of right triangle, the magnetostrictive sleeve is abutted against a hypotenuse of the right triangle;
• the guide surface is arranged around the periphery of the flexible nozzle body;
• and
• the flexible nozzle body is made of a silica gel or latex material.