PNEUMATIC SOWING APPARATUS FOR SOWING SMALL-SEED CROPS Russian patent published in 2016 - IPC A01C7/16 

FIELD: agriculture.

SUBSTANCE: sowing apparatus includes a seed hopper 1 with a base 2 which is provided with sowing windows which are linked to a seed tube 4. A seed disc 6 is mounted on a vertical shaft 5 over the base 2, the said disc having, arranged uniformly on concentric circles with a radius R_n, equal to where n is the number of the circle from the centre of the seed disc and l is the distance between rows of the sowed seeds of small-seed crops in mm, identical cells and a system for compressed air supply 8. The number of cells increases on each next circle in proportion to the length of the radii of the next and previous circles. All the cells are in the form of a funnel, the opening of which is equal to the size of the sowed seeds. The base 2 of the hopper 1 has an identical cylindrical shape and diameter, greater than the diameter of the cell of the seed disc 6, sowing windows arranged on the same number of concentric circles with the same radii. The number of the sowing windows is equal to the number of rows of the sowed seeds. Each circle has the same number of sowing windows which are built into the row on two mutually perpendicular diameters of the base 2, one of which makes an angle of 45° with the axis of symmetry of the base clockwise. Each sowing window is provided with the seed tube 4 situated below the base and made in the form of two interfaced cylinders, the upper one of which is arranged perpendicular to the base 2 and the lower one at an acute angle to the base with a diameter which increases in the direction from the sowing window, while enabling the supply of compressed air into each lower cylinder of the seed tube 4, where the jet of the compressed air is directed along the edge of the lower cylinder. The hopper 1 is in the form of a cylinder which is interfaced with the base of a truncated cone, the edge of which makes an angle of less than 34° with its base.

EFFECT: high operational reliability and high efficiency of the sowing apparatus which provides quality sowing of seeds of small-seed crops.

4 dwg