PNEUMATIC SEEDER Russian patent published in 2023 - IPC A01C7/04 

FIELD: agricultural engineering.

SUBSTANCE: precision drill machines for cultivated crop. Pneumatic feed contains a housing, seed and vacuum chambers. A seeding disc with suction holes of the same diameter evenly spaced around the circumference is installed vertically on the horizontal shaft with the possibility of its replacement for seeding discs with suction holes of a different diameter. The seeding disc has a lamellar rotary ejector of “excess” seeds with an elongated hole and sawtooth protrusions, the tops of which are located along an arc of a circle with a radius equal to the radius of the suction holes on the seeding disc. The working surface of the protrusions is turned towards the suction holes and is perpendicular to the end plane of the seeding disc. A cam, an axis of rotation and a guide axle are fixed on the housing of the seeding unit. The ejector is pivotally mounted with its upper end on the pivot axis, while the latter is fixed on the upper part of the body at a distance from the axis of the seeding disc, equal to its radius from the guide axle and with the possibility of being fixed in the programmed position by a torsion spring. The latter is installed at one end on the axis of rotation, and at the other end is fixed on the ejector of “excess” seeds, at the lower end of which there is a base for moving the cam of the involute profile along it with the radius of the main circle equal to the larger diameter of the suction hole. The cam is mounted on the shaft of the stepper motor, fixed on the seeder housing at a distance equal to the seeding disc radius from the guide axis of the elongated hole.

EFFECT: improving the accuracy of tuning pneumatic seeders for single-grain sowing of seeds of row crops due to the smooth automatic adjustment of the position of the “excess” seeds ejector and the reliability of its fixation in the desired position.

1 cl, 4 dwg