SU1256706A1 - Pneumatic sowing apparatus - Google Patents

Description

The invention relates to agricultural machinery, in particular to pneumatic precision seeding machines, which can be used on seeding machines.

A pneumatic sowing apparatus is known, comprising a housing, an air injection system, adjacent to the housing of the seed bunker and a sowing element with cells, above which the receiving windows of the ejection pipes 1 are located.

The disadvantage of this pneumatic apparatus is that, at elevated speeds of the aggregate, it does not provide for large seeding rates and degrades the quality and accuracy of seeding due to the presence of unfilled cells.

The purpose of the invention is to improve the quality of seeding by improving single grain seed selection.

This goal is achieved by the fact that in a pneumatic seeding apparatus, including a housing, an air injection system, a seed bunker adjacent to the hull, and a sowing element with cells above which the ejection branch pipes are located, in the housing there is an annular chamber with a partition installed in the transportation zone seed over the cells that divide the chamber into the lower and upper cavities, with the latter being connected to the injection system and ejection pipes.

In addition, in the upper cavity of the chamber, between the filling area and the seed transportation area, a retaining grid is installed.

FIG. 1 shows a pneumatic sowing unit, general view; in fig. 2A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. 4 shows a section B-B in FIG. one.

The pneumatic sowing apparatus includes a housing 1., a seed bin 2 and a sowing element in the form of a disk 3 with conical cells 4. The cells have through holes 5. An annular chamber 6 is made in the housing, divided by a partition 7 into

upper 8 and lower 9 cavities. The lower cavity 9 is formed by a septum and a sowing disk 3. On the opposite side of the sowing disk, a pressure chamber 10 is installed, connected to an overpressure source (not shown). The upper cavity 8 is in communication with an overpressure source and ejection pipes 11. A discharge grid 12 is installed between the filling area G for the transportation zone of the seeds D to the channels 13 to which these wires 14 are connected.

Sowing machine operates as follows.

Seeds by gravity flow from the hopper 2 into the housing 1 of the metering unit and are captured by the cells 4 of the seed disc 3. Air blown into the upper cavity 8 of the annular chamber 6 is divided into two streams. Part of the air rushes into the ejection nozzles 11, and part through the spraying grid 12 enters the filling zone and passes into the atmosphere through the through holes of 5 cells 4, thereby keeping the seeds in them when transported by the sowing disk 3 to the removal zone. Spraying grate 12 levels the air flow, which also prevents seeds from being caught by the surface of the rotating seed disc 3. Partition 7 prevents the seeds transported in the cells from the dynamic impact of the air stream and blowing them out of the cells. At the moment of passage of the cells with seeds under the receiving windows of the ejection pipes 11, the seeds are removed from the cells, which is carried out by the combined effect of ejection and blowing the seeds out of the cells with an air jet from the chamber 9. Seeds are transported through channels 13 and further along these wires 14 to the sealing working bodies.

Compared with the base object - 12-rand sekopy SKPP-12 - the use of the proposed sowing apparatus will allow to increase labor productivity and reduce specific consumption of materials.

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Editor M. Tsitkina Order 4852/1

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

1rig.4 Compiler 3. Sidorov

Tehred I. Veres Corrector A. Zimokosov

Circulation 679 Subscription

Claims (2)

1. PNEUMATIC SOWING UNIT, comprising a housing, an air injection system, a seed hopper adjacent to the housing and a metering element with cells, above which there are receiving windows of ejection nozzles, characterized in that, in order to improve the quality of sowing by improving single-grain seed selection, in the housing an annular chamber is made with a partition installed in the zone of transporting seeds above the cells and dividing the chamber into lower and upper cavities, the latter being in communication with the injection and ejection system ny branch pipes. 2. The apparatus by π. 1, characterized in that in the upper cavity of the annular chamber between the filling zone and the seed transporting zone with cells, a straightening grid is installed. FIG. ί