The invention relates to the technical field of
agriculture, and discloses a
pest control device for agricultural
crop protection, which comprises a
machine body, a plurality of connecting arms are mounted on the outer side of the
machine body, an adjusting box is detachably connected to the bottom of the
machine body, a storage box is mounted at the bottom of the adjusting box, and a driving motor is mounted on the outer side of the adjusting box. A driving screw rod is fixedly connected to the output end of the driving motor, a threaded sleeve is in threaded connection to the exterior of the driving screw rod, a movable
piston is fixedly connected to the exterior of the threaded sleeve, and a first rotating shaft is movably connected to the upper side of the interior of the adjusting box through a bearing. The adjusting box is arranged on the unmanned aerial vehicle, and the adjusting box adopts a unique double-cavity design and is matched with the movable
piston, so that the concentration of the
pesticide liquid in the storage box can be adjusted according to the change of the flight condition of the unmanned aerial vehicle and the
crop insect pest condition, and the spraying concentration of the
pesticide liquid is accurately controlled; the
pesticide liquid can cover target crops more effectively, and waste of pesticide is reduced.