RU211676U1 - Re-threshing device of a grain harvester - Google Patents

Abstract

The claimed utility model relates to agricultural engineering and can be used in combine harvesters for final threshing of the heap coming from the cleaning of the combine.

Re-threshing device of a grain harvester, containing a casing of a return auger, a return drum with whips, transport sectors and a chute, as well as a return elevator, characterized in that a distribution drum with scourges, transport sectors and a chute is inserted into the re-threshing device, moreover, in the upper part of the chute of each drum in the area where the scourges exit from it, a recess with a stripping protrusion is formed, the gap between the protrusion and the scourge is 6 mm with the possibility of passing grain without damage, and the chute of the distribution drum is perforated with holes passing through for grains. The utility model improves the quality of threshing grain crops by intensifying the process, which leads to a reduction in crop losses. 1 ill.

Description

The claimed utility model relates to agricultural engineering and can be used in combine harvesters for final threshing of the heap coming from the cleaning of the combine.

It is known a device for final threshing of a return auger, containing a casing of the return auger, a return elevator, a distribution auger and an auger drum installed in the casing of the return auger and pivotally fixed at one end on a flange fixed on the casing of the return auger, and at the other end - on the support of the return auger, while on the auger drum, brackets with fixed corrugated whips are screw-shaped, and between the brackets, helical sectors are installed that move the threshed heap into the receiving window of the return elevator (RF patent for utility model No. 153225 A01F 12/18). The task of the authors of this model was to simplify the design, reduce grain damage and increase the reliability of the process. These problems are solved by the authors, however, there is a drawback in the design.

A disadvantage of the well-known utility model is the high probability of under-threshing of a heap of ears, especially slightly moistened. The replacement of a standard re-threshing drum with a screw drum proposed by the authors is far from being complete, and if additional devices are not introduced, then the grain heap will remain under-threshed. A standard re-threshing drum hits the ears with its whips at a speed of 28 m/s, in addition, there are fixed protrusions of the deck under the whips that slow down the movement of the ears in order to increase the impact. The screw drum proposed by the authors is mounted on the basis of a standard return screw, which has a rotation speed of 3.3 m/s. Under the auger, the bottom of the trough is smooth, there are no braking protrusions, that is, there will be no impact or wiping of grains from the ears. This will lead to inflated yield losses.

The technical result of the utility model is to improve the quality of work of the re-threshing device of a grain harvester.

The technical result is achieved by the fact that in the after-threshing device of the combine harvester, containing the casing of the return auger, the return drum with whips, transporting sectors and a chute, as well as the return elevator, a distribution drum is introduced with whips, transporting sectors and a chute, and in the upper part of the chute of each drum in the area where the scourges exit from it, a recess with a stripping protrusion is formed, the gap between the protrusion and the scourge is 6 mm with the possibility of passing grain without damage, and the chute of the distribution drum is perforated with holes passing through for grains.

In FIG. 1 shows the re-threshing device of a combine harvester.

The after-threshing device of the grain harvester contains a casing 1 of the return auger, an auger drum 2, a return elevator 3 and a distribution drum 4. The casing 1 of the return auger includes sidewalls 5 and 6, as well as a chute 7. The base part of the return drum 2 is its pipe 2, on which the screws scourges 8 are fixed. Sectors 9, which are fragments of a spiral auger belt, are attached to the side surfaces of the scourges with 8 screws. The whips have a corrugated working surface. In the upper part of the chute 7, in the zone where the scourges exit the chute, a recess 10 with a combing protrusion 11 is formed. The chute 12 of the distribution drum 4 is perforated with holes 13 passing through for grains. Like the spit drum, the distribution drum is equipped with interchangeable flails and sectors, and also has a recess and a combing ledge similar to positions 10 and 11.

The pre-threshing device of the combine harvester works as follows. The return heap enters the casing of the return auger 1 from the sieve cleaning unit (not shown). The spike drum 2 drags the ears into rotation with its whips, and centrifugal force presses them to the chute 7. Approaching the recess 10 in the chute 7, the ears hit the stripping ledge 11. The gap between the ledge and the whip is 6 mm, that is, the grains pass without damage, but the ears do not pass, they are destroyed, and the grains fall out of them. Partially, the ears are also destroyed by dragging them with whips through a mass of other ears and from friction along the bottom and sides of the trough. Sector 9 moves the grain heap to the grain elevator 3 and, having the same diameter of the rotation trajectory as the whips, also participate in pinching the ears in the area of the combing protrusion 11. The grain elevator 3 feeds the grain heap into the chute 12 of the distribution drum 4. The distribution drum works in the same and spike, with the only difference that the grains released from the ears fall onto the shaker board (not shown) from the chute 12 through the holes 13 to reduce damage. At the end of the chute 12, the outlet is open to the remaining grains.

Thus, the final threshing of the heap is significantly intensified, which will reduce grain losses during combine harvesting.

Claims (1)

The after-threshing device of the grain harvester, containing the casing of the return auger, the return drum with whips, transport sectors and a chute, as well as the return elevator, characterized in that a distribution drum with whips, transport sectors and a chute is inserted into the re-threshing device, moreover, in the upper part of the chute of each drum in the area where the scourges exit from it, a recess with a stripping protrusion is formed, the gap between the protrusion and the scourge is 6 mm with the possibility of passing grain without damage, and the chute of the distribution drum is perforated with holes passing through for grains.

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