RU2690480C1 - Lipped screen - Google Patents

Abstract

FIELD: agriculture; machine building.SUBSTANCE: invention relates to agricultural machine building, in particular, to combine harvesters. Lipped screen comprises a frame with louvres that are sectionally arranged along the sieve width and have different mounting angles. Louvres are secured to the crankshaft rotary axes of their position adjustment mechanism. Lower shields of louvres are toothed. Teeth of lower shields, which stand one after another, are arranged in staggered order.EFFECT: use of this invention ensures reduction of grain losses at increased supply of grain-and-straw heap.1 cl, 2 dwg

Description

The invention relates to agricultural machinery, in particular to combine harvesters.

The purpose of the invention is to reduce the loss of grain by increasing the separation efficiency with an increased supply of grain - straw heap.

A louvered sieve of cleaning a combine (1) is known, containing a frame with sectioned louvres sectioned across the sieve width, having different angles, mounted on rotary axes and a louver adjustment mechanism.

The disadvantage of this device is the low efficiency of the separation of grain with an increased supply of grain - straw heap due to the fact that at the entrance between the lower flaps of the blinds formed turbulence. This reduces the speed of the air ceiling coming out of the sieve, which loses the ability to loosen a layer of grain - straw straw, which reduces the screening of grain through it, increasing losses.

A louvered sieve is known that contains a frame, sections with concave louvers fixed on rotary axes, and the radius of curvature of its working surface is larger than the radius of the non-working surface and sections with a large angle of inclination of the louver are installed on the sections of the sieve with a reduced air flow rate.

However, this design of the lower flap reduces the inlet between the louvered space, which is especially noticeable when the opening angle of the louver is reduced. In this case, the rectilinear edges of the lower flaps of the first louvers, cutting off portions of the air flow, change the direction of the main motion vector of air, making it parallel to the edges of the lower flaps of the louver.

Because of this, in subsequent blinds a smaller part of the air flow passes into the gap between the lower shields, which is not enough to loosen and maintain a thick layer of grain - the straw of heaps in a suspended state, and this leads to an increase in losses due to cleaning.

The technical result of the proposed technical solution is the reduction of grain losses with an increased supply of grain - a straw heap, which is achieved by the fact that the lower flaps of the louvers are jagged, while the teeth of the lower flaps of adjacent blinds standing next to each other.

Distinctive features of the invention: the bottom plates are jagged, with the teeth of the blinds standing behind each other arranged in a checkerboard pattern.

These features distinguish the invention from the prototype and ensure its compliance with the criterion of novelty. The analysis of the invention for compliance with the criterion of significant differences. The signs of the known technical solutions, similar to the essential features of the proposed device, together with the others do not allow to obtain a positive effect, similar to the one proposed. Therefore, the invention meets the criterion of significant differences.

FIG. 1 shows a schematic cross section of a louvered sieve; in fig. 2 - section of the louver section.

The louvre sieve contains a frame 1, louvre elements 2, sectioned along the sieve width and installed with a constant pitch and an adjusting mechanism 3. The lower flaps of the louvers are jagged. Such a design of the guards and the arrangement of the teeth of adjacent, one behind the other louvers in a staggered manner reduces the resistance to air flow at the entrance to the inter-louvered space, reduces turbulence, contributing to the active passage of air and loosening of the straw-heap.

A louvre sieve works as follows. Grain is a heap of straw entering the louvers 2, mounted on frame 1 and fixed to the crankshaft pivot axes of the mechanism for adjusting their position, is subjected to mechanical oscillatory action. When the working conditions change, the opening angle of the louver changes with the help of rotary axes, the regulating mechanism 3. At the same time, the straw heap undergoes active air flow through the sieve evenly along the entire length of the sieve due to the performance of the lower shields of the louvre and staggered.

USED SOURCES

1. Patent 1484323 USSR, IPC A01F 12/44. Jalousie sieve / Yashchenko EM, Meshcheryakov IK, Vodyannikova E.F. - №87 4268510; declare 06/26/1987.

2. Patent 1464957 USSR, IPC A01F 12/44. Cleaning a combine harvester / Yashchenko EM, Meshcheryakov IK, Vodyannikova EF - №87 4290269; declare 07.27.1987.

Claims (1)

A louvre sieve containing a frame with louvres sectioned across the sieve width, having different installation angles, fixed to the cranked rotary axes of the mechanism for adjusting their position, characterized in that the lower flaps of the louvers are serrated, with the teeth of the lower flaps facing each other located in staggered order.

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