RU180324U1 - Combine Harvester Cleaning - Google Patents

Abstract

Cleaning a combine harvester belongs to the field of agricultural engineering and can be used in the design of cleaning a combine harvester. Harvester cleaning includes a shaking board, an upper louvre sieve, an extension of the upper louvre sieve, a lower louvre sieve, longitudinal vertical air flow dividers of the lower and upper louvre sieves, a sectional fan, a grain elevator, and a grain elevator. Longitudinal vertical air flow dividers are installed under the lower and upper louvres, according to the operation of the fan sections. The use of this design allows to improve the quality of cleaning grain harvested culture. 2 ill.

Description

The utility model relates to agricultural engineering and can be used in the construction of combine harvesters.

Grain heap enters the upper louvre sieve along the transport board, grain, waking up, falls on the lower sieve. Under the sieve is directed a stream of air from the fan, which blows out light impurities. The peeled grain, passing through the lower sieve, enters the grain auger, and under-milled spikelets go immediately to the spike auger. The unfinished grain enters the extension of the upper sieve, from where it enters the spike auger. (V.M. Khalansky, I.V. Gorbachev, “Agricultural Machines” - Moscow: KolosS, 2004, 624 p.)

The disadvantage of the classical cleaning system is the inability to evenly distribute the air flow from the fan across the entire width of the combine cleaning sieves. This is caused by the redistribution of air flow into the zones of least resistance to its movement. It is impossible, during the operation of the combine harvester, to ensure uniform loading of sieves in width. With direct combining in the central part of the sieves, and with separate harvesting along their lateral sides, an enlarged layer of straw-grain heap is formed. This fact provides different resistance to the passage of air flow through the sieve along their width. Which ultimately leads to the redistribution of air in the cleaning system and the violation of its effective operation. This fact determines the increased contamination of the grain heap in the bunker of the combine and increases the loss of grain during cleaning.

As a prototype, the design of the combine cleaning system (patent number RU 2486744) was chosen, the design of which includes a shaking board, upper and lower louvres, upper and lower sieve mills, and a fan. The upper sieve mill has non-adjustable guide boards, and the lower sieve mill has adjustable guide boards. The width of the guide boards is equal to the distance between the longitudinal dividers of the upper and lower louvre sieves for cleaning the combine harvester.

The disadvantages of the prototype can be attributed to the fact that this cleaning design does not evenly distribute the air flow across the width of the sieves from the sectional fan. Which leads to the movement of air flow to the areas of least load. This leads to increased grain loss during cleaning of the combine, increased clogging of the grain heap in the bunker of the combine.

The objective of this utility model is to uniformly distribute the air flow from the sectional fan across the entire width of the cleaning of the combine harvester, by installing longitudinal vertical air flow dividers.

The task of cleaning the combine harvester consisting of a shaking board, an upper louvre sieve behind it with an extension cord mounted on it, a lower louvre sieve installed under them, a grain elevator installed under the lower sieve, an elevator elevator located under the upper louvre sieve extender and sectional fan is solved by installing under the upper and lower louvre sieves of vertical air flow dividers, according to the sectional division of the fan, which Will distribute airflow across the width of the combine harvester cleaning uniformly.

The claimed utility model is illustrated by drawings, which show the cleaning of a combine harvester (see Fig. 1 and Fig. 2).

The proposed device consists of a shaking board 1, an upper louvre sieve 2 located behind it with an extension cord 3 mounted on it, a lower louvre sieve 4 installed under them, a grain elevator 5 located under the lower sieve, an elevator 6 installed under the upper sieve extender, sectional fan 7, longitudinal vertical air flow dividers 8 and 9, located under the upper and lower louvres, according to sectional division of the fan.

The proposed device operates as follows. Depending on the method of combining, the harvested mass arrives at the shaking board 1 on its sides, with direct combining or in the center, with separate combining. Due to this, an uneven distribution of the air flow is observed, since it tends to the zones with the least resistance to its passage. This leads to the fact that the most loaded cleaning areas receive less air flow, which is not able to fully perform air cleaning of the grain heap. Further, from the shaking board, the grain heap enters the upper louvre cleaning sieve 2, where the bulk of the grain is released due to the influence of vibrational movements and the removal of large particles of weed impurities having a critical rate of soaring below the main crop, outside the combine due to the impact of the air stream, which thanks to the longitudinal vertical air dividers, 8 flows evenly according to the operation of the fan sections. Further, the selected grain and parts of the weedy impurities having a critical speed of rotation equal to or higher than the main crop are fed to the lower louvre cleaning sieve 4, where they are also exposed to oscillatory movements and air flow, which, thanks to the longitudinal vertical dividers of the air flow 9, flows uniformly, according to the work fan sections. The grain of the main crop extracted on the lower louvre sieve is fed to the grain elevator 5. Unmilled parts of the spikelets and undetected weed impurities are fed through the upper louvre sieve to the extension of the upper louvre sieve 3, waking through which they enter the spike elevator.

Output. The proposed design for cleaning the combine harvester with the installation of longitudinal vertical air flow dividers under the lower and upper louvre sieves according to the operation of the fan sections allows you to evenly distribute the air flow over the entire width of the cleaning of the combine harvester and improve the quality of grain cleaning.

Claims (1)

Cleaning the combine harvester, including a shaking board, an upper louvre sieve behind it with an extension cord attached to it, a lower louvre sieve located below them, a grain elevator installed under the lower sieve, an elevator located under the upper louvre extension, and a sectional fan the fact that under the lower and upper louvre sieves are fixed longitudinal vertical air flow dividers according to the sectional division of the fan.

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