SU368825A1 - DEVICE FOR SURFACE SEEDING BULK MATERIALS TO PNEUMATIC SEEDS - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to agricultural machinery, in particular, to slavers for the surface sifting of bulk materials: grass seeds, fertilizers, pre-chemicals H, etc.

Pneumatic seeding machines and other machines are known in which flat expanding nozzles with installed inside their channel on axes or fixedly fixed plates are used for surface sifting of bulk materials, which serve to evenly distribute the seed. However, they have a small strip of sieving and are clogged with the material being sown. Attempts to increase the width of the material sieving strip by significantly increasing the opening angle of the nozzle lead to separation of the air flow from the sides of the nozzle, sedimentation of the material in it and, as a result, to a violation of the sieving uniformity of the material.

The described device is characterized in that the nozzle in it is made with a gradually decreasing height to the output slit, the sidewalls of the nozzle are double bent at angles, and the flow divider has a wedge shape, the height of which is less than the distance between the nozzle channel surfaces at the site of the wedge. This ensures a uniform sieving of the material across the width of the grip.

The drawing shows the described device, top view.

It has two surfaces - the top 1 and bottom 2, sidewall 3 and the divider 4, mounted on the bottom surface.

The height of the divider in the place of its slope is less than the height of the channel; this ensures the movement of air with the transported material along the central part of the nozzle channel.

To eliminate the delay of the long particles of the material being transported, the divider is fixed at such a distance from the sidewalls that ensures the free movement of the material transported by the air. At the same time, the divider parameters and the place of its fastening on the lower surface of the device are chosen so that the air flow velocity along the edges of the output channel is sufficient to provide a given string of nolosy

sieving material. For the same purpose, the sidewalls are double-curved by the angles ai and from the axis of symmetry of the channel, and their height is nostenno decreased from the entrance channel to the exit slit. Due to this, the nozzle channel gradually expands narrowing simultaneously at the height.

Thus, the air flow gradually expands and, in the zone of maximum opening, acquires the necessary speed, aligns with the width of the slit and uniformly scatters across the surface of the floor at a considerable width, and tucks away with unilateral impurities.

Subject matter

The device for the surface sieving of bulk materials to the pneumatic sections, made in the form of a flat expanding nozzle with a divider, is arranged inside

nozzles, characterized in that, for the purpose of more uniform sifting of materials across the width of the grip, the nozzle is made with a step-by-step reduction to the exit slit height, the sides of the nozzle in the part opposite the exit ridge are spruce bent twice, and the divider has the shape of a climax to the bottom surface, the height of which is less than the distance between the surfaces in place of the wedge.