SU1464957A1 - Cleaning unit for grain combine harvester - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to agricultural machinery. The purpose of the invention is to reduce cleaning losses. Cleaning a combine harvester contains upper and lower 2 louvre sieves, a centrifugal fan 3, an aerodynamic duct 4. The louvre sieves contain louvers 6 and 7 of different widths fixed on the axles 5. The louvre sieves 1 and 2 are driven and blown by air flow from fan 3. The heap on the surface of the sieves is exposed to alternating intensity of air flow, which contributes to the intensification of the release of grain. 1 h. apt. 3 il. (ABOUT

Description

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FIELD OF THE INVENTION The invention relates to agricultural machinery, for example, a device for cleaning a combine harvester.

The aim of the invention is to reduce cleaning losses.

FIG. G schematically shows the cleaning of the combine harvester, the cut; in fig. 2 — node I in FIG. one; in fig. 3 is a view A of FIG. 2

Cleaning combine harvester contains the top 1 and bottom 2 louvered sieves, centrifugal fan 3, aerodynamic box 4.

Louvers of the sieve 1, 2 are placed in the aerodynamic duct 4 one above the other, and the fan 3, designed to blow them, is installed in front of the sieves, its discharge nozzle is angled to these sieves. The louvre sieve contains blinds 6 and 7 installed alternately on the rotary axes x 5, including the teeth 8, the finned surface 9 and the helix 10 of air, with the finned surfaces of the blinds 6 and 7 and their air guides made of various widths: b; Lg, d; di.

Air guides 10 together with the aerodynamic box 4 serve to distribute the air flow along the length of the sieve.

The surfaces b and bi are made with teeth, and the lower working surface of the louver is in the form of air guides d and di, which, together with the aerodynamic duct, are used to distribute the air flow along the length of the sieve.

The louvers with a larger width of the air guide () are made with an upper ribbed surface of a smaller width, and their upper edges of the teeth are located below the corresponding edge of the louvres alternating with it.

The described cleaning of the combine harvester works as follows.

The louvres sieves 1 and 2 are oscillating and are blown from below by inclined air flow of the fan 3, which is distributed along the sieve with the help of the aerodynamic duct 4 and louvre air guides, and its distribution occurs with alternating intensity flows blowing through the inter-channel zones. The heap entering the cage under the action of the oscillatory motion of the sieve moves along it, being simultaneously subjected to alternating intensity of the air flow. At the same time, flows with increased speed are used for more jigging of grain through reduced finned jalousie surfaces with an increased area of interdental spaces into inter-channel spaces with a reduced flow rate. There is a facilitated selection of grain and in large quantities from the enriched heap, ensuring the constant purity of the grain.

In addition, the likelihood of multiple high-angle reflections of grains in the direction of movement of the product from the upper working surface of the louver is reduced.

Claims (2)

1. Cleaning a combine harvester containing a louvered adjustable sieve blown by inclined air flow, and part of the louver has air guides of greater width than the rest of the fan, characterized in that, in order to reduce cleaning losses, the upper surface of the louver having greater the width of the air guide is smaller than that of the louver with a smaller width of the air guide, while the louvers with a larger width of the air guides are installed between the louvers with a smaller width of the air guides a. 2. Cleaning according to claim 1, characterized in that the upper edge of the teeth of the louver with a greater width direct the air below the upper edge of the teeth of the louver with the air guide. dzig.g Compiled by K. Tsallagov Editor A. Makovska Tehred I. VeresKorrektor M. Maksnmishynets Order 847/3 Circulation 618 Subscription VNIIPI State Committee for Inventions and Discoveries of the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing combine “Patent, Uzhgorod, ul. Gagarin, 101 Buff A .