DE2706759A1 - CONVEYOR TRANSFER ON A CONVEYOR ARRANGED UNDER A THRESHING DRUM OF A COMBINE - Google Patents

Description

Klöckner-Humboldt-Deutz AG branch in Fahr 7702 Gottmadingen

Threshing concave transition to a concave arranged below a threshing drum of a combine harvester

The invention relates to a combine harvester in which the Threshing organs, formed from a threshing drum and a threshing concave, a rotating one opposite to the axis of rotation of the threshing drum an elevated, straw collector is connected downstream, which exits the threshing organs and a rake-like designed, Directional concave transition diverts the straw-grain mixture to a shaker.

Concave transitions serve the purpose of conveying the straw-grain mixture emerging from the threshing elements either directly to the downstream shaker or to an additional guide element, e.g. a rotating straw collector, from where it is transferred to the

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Shaker arrives to feed.

This concave transition exists in the simplest version from a sheet of metal that rises obliquely backwards at the end of the concave is attached.

The concave transition according to US-PS 2 79 ^ ^ 58 is like a rake formed so that when the straw-grain mixture passes the transition, grains contained in the lowest straw layer as a result fall under the action of gravity, that is, are fed directly to the cleaning organs.

This "pre-separation" in the area of the concave transition is desirable because it relieves the shaker. The shaker, which reacts sensitively to some influencing variables, represents the performance limit of a combine harvester. This performance limit is practically reached with large combine harvesters, since the dimensions of the machine are also determined by the shaker dimensions. In the concave transitions of the type appreciated above, an attempt is made to place the maximum separation in the front area of the shaker, so that additional devices known under the term "shaker aids ¹¹ " and those in

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primarily serve the purpose of the deposition on the shaker in the middle or rear areas to more intensive, can be dispensed with.

Another concave transition is from DT-AS 1 127 652 become known, in which a pre-separation is to be achieved in that the straw-grain mixture over grid strips that are formed with webs and baffles running in the discharge direction. On the one hand, this arrangement sets a certain position of the conveying channel in relation to the threshing organs or the Threshing concave ahead of the threshing drum, as the straw-grain mixture emerging tangentially at the end of the threshing organ-e is a certain Direction, which is given within relatively narrow limits, must take in order to get to the following shaker. In order to be able to meet this requirement, the concave is roughly in the third Quadrants of the threshing drum enveloping circle - seen in a side view, which requires an elevated arrangement of the conveyor channel. the end For reasons of better material flow, however, the harvested crop should be fed to the threshing elements from below so that the Concave would have to assume a correspondingly higher position counterclockwise. In such an installation position, however, the proposed concave transition cannot be used. A

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Another disadvantage of the proposed arrangement is that To achieve the impact process provided there, a certain assignment of the concave transition to the crop flow is observed must be, which requires complex adjustment means. This setting also varies depending on the type of crop to be processed. Furthermore, other influences such as carried soil, moisture of the harvested crop and the considerable braking effect of the Transition very detrimental to the function.

The object of the present invention is therefore to provide a threshing

To create basket transition in which an additional and intensive

Separation can also be achieved through the use of the straw guide goose.

The object is achieved according to the invention in that the rake-like concave transition is divided into two sections, the first section in the discharge direction of the straw-grain mixture on the concave or at an angle to it runs inclined backwards and merges into the second section, which lies below the straw collector and approximately horizontally is arranged. With the design of the concave transition according to the invention, structurally and structurally simple

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Art essentially achieve two very beneficial effects. Of the The first section of the concave transition takes to the exit direction of the crop at the concave end or to the envelope circle Threshing drum an approximately wedge-shaped or funnel-shaped layer, so that in this area the straw-grain mixture is fanned out. The very advantageous consequence of this is that a first separation process in the thin straw carpet at a high speed, due to the centrifugal acceleration that is still effective here on the residual grains contained. The further effect can be seen in the fact that the straw-grain mixture is diverted through the straw guide element impinges on the horizontally lying section of the concave transition, so that also during this process a separation takes place through the linear acceleration forces acting here. The concave transition formed like a rake ensures that the grains can actually pass through the straw carpet and not "rebound" into it .

In the dependent claims 2 and 3, structural features are a Exemplary embodiment of a concave transition according to the invention is given.

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It has been found here that the deposition in area B can also be influenced by the shape of the upper edges of the panes. A sawtooth-shaped course proved to be particularly favorable, which does not hinder the positive of the threshed crop, but in the zones of the upper edges of the Disc brakes. Thus a loosening and partly also a rearrangement of the straw carpet is achievable, which for the separation process, especially when the crop is moist, is very beneficial (dependent claim 7).

Those listed in the subclaims 4 to 6 and 8 to 10 Features or dimensions reflect the structural design in which an optimal result of the separation process was determined.

Further features essential to the invention, as well as the advantages resulting therefrom, can be found in the following description of an exemplary embodiment with reference to the drawings.

Here show:

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Pig. 1: a longitudinal section through the front area of a combine harvester in a schematic representation;

Fig. 2: the transition zone from the threshing organs to a downstream shaker.

In Figure 1, the front area of a combine harvester, within which the threshing members 1, a straw collector 2 and the front part of a shaker 5 are shown.

Below the threshing members 1, the straw pickup 2 and the shaker 3, a return floor 4 is arranged, which, together with swinging the sieve box (not shown), the grain, short straw, etc. separated by the threshing and separating devices to the other cleaning facilities.

The threshing members 1 formed via an elevated conveyor 5 from a threshing drum 6 and an underlying, adjustable distance. Concave 7 »harvested crop is threshed out and arrives via a concave transition 8

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in cooperation with the straw collector 2 on the shaker J.

In Figure 2, the transition zone from the threshing members 1 to the downstream shaker 3 is enlarged compared to Figure 1, schematic representation reproduced.

The concave transition 8 is made up of a large number of spaced apart over the vehicle transverse direction, thin-walled disks 9 formed. The disks 9 are attached to a common, strip-shaped base body 10. The connection between the concave 7 and the base body 10 is via screw connections (not shown) performed. The concave transition 8 is divided into two sections A and B.

The portion A is of the straw-grain-batch, in this case inclined relative to the vertical, in the flow direction arranged at an angle "a" which is preferably 50 ⁰ with respect to the outlet direction. In the illustrated embodiment, the length of section A is approximately 90 to 120 mm.

The straw-grain mixture emerging from the threshing organs becomes

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fanned out in the area of section A, which is favored in an advantageous manner by the wedge-shaped inclination of this section to the exit direction or by the funnel-shaped position to the enveloping circle of the threshing drum (seen in the longitudinal cross-section). Furthermore, a slight setback of the base body 10 by the dimension "b" in the direction of flow promotes separation. In the ^{example shown, the dimension n} b ^N is approximately 5 mm.

The section A merges into a section B, which runs approximately horizontally below the straw pickup 2. the Upper edges of the disks 9 are designed in a sawtooth shape in the area of section B. The length of the section B is dimensioned such that the distance from the exit point of the threshed crop on the threshing members 1 to the front edge 12 of the Shaker 3 is just bridged when it is reversed to the rear.

For the flow of material, it has proven to be beneficial if the distance "c" of the enveloping circle 13 of the straw collector 2 to the exit point 11 on the concave 7 is in the range of approximately 150 to 200 mm lies.

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The function of the device described is as follows:

The straw-grain mixture emerging from the threshing organs 1 is fanned out in section A and by the counterclockwise rotational movement of the threshing drum 6 in the direction promoted to the straw buyer 2. In this area is the centrifugal acceleration on the grains contained in the straw carpet effective, so that a first separation process occurs.

The straw-grain mixture diverted by the straw collector 2 then arrives at a relatively high speed in the section B of the disks 9, from where it, represented by arrows 14, reaches the foremost steep step 15 of the shaker 13.

When the straw hits the upper edges of the disks 9, a second separation process takes place in such a way that Although the straw is deflected, a substantial part of the residual grains contained in it is removed from it by their kinetic energy Straw carpet emerges. It should be noted that the Disks 9 have a mutual distance from one another, so are permeable. The direction of movement of these residual grains is represented by the solid arrows 14.

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Claims (11)

2VÜ67b9 -μ- Patent claims ΓΙ.) Combine, in which the threshing organs, formed from a The threshing drum and a threshing concave are followed by a rotating straw pickup, which is located at an elevated level in relation to the axis of rotation of the threshing drum and which is produced by the threshing organs straw-grain mixture emerging and passing through a rake-like, directional concave transition diverts to a shaker, characterized in that the rake-like concave transition (8) is divided into two sections (A and B), the first section (A) runs in the discharge direction of the straw-grain mixture on the concave (7) or inclined obliquely to the rear and merges into the second section (b), which is arranged below the straw pickup (2) and lying approximately horizontally. 2. concave transition according to claim 1, characterized in that it consists of a plurality of thin-walled disks (9) with front and upper length dimensions, which the sections (A and B ) correspond, formed 1st. - 12 - 809834/0078 ORIGINAL INSPECTED a- 3. concave extension according to claim 2, characterized in that the discs (9) are attached to a base body (10). 4. concave extension according to claims 1 to j5, characterized characterized in that the section (A) is preferably inclined at an angle of zero to about 150 ° with respect to the exit direction of the straw-grain mixture at the concave in the flow direction. 5. concave extension according to claim 1, characterized in that the - seen in side view - the front and lower corner points of the discs (9) relative to the inner radius of the Concave (7) are set back slightly (dimension "b") in the direction of flow. 6. concave extension according to claim 5 *, characterized in that the amount of offset "b ^N in the range greater than zero mm is less than 30 mm, preferably 5 mm. 7. concave extension according to claims 1 and 2, characterized in that the overhead edges of the discs (9) are designed in the shape of teeth. - 13 -809834/0078 8. concave extension according to claims 1 and 2, characterized characterized in that the distance between the enveloping circle (13) of the straw collector (2) and the exit point (ll) of the concave is about 150 to 200 ram. 9. concave extension according to claims 1 and 2, and 8, characterized in that the length of the section (A) is about 90 to 120 mm. 10. concave extension according to claims 1 and 8, characterized characterized in that the distance from the center of the axis of the straw collector (2) to the exit point (ll) of the concave (7) Does not fall below 300 mm. 11. concave extension according to claim 1, characterized in that the section (B) is chosen to be at least as large as that the distance from the exit point (ll) of the concave (7) to the front edge (12) of the shaker (3) is still bridged when it is reversed to the rear. Efm 713/76 8.2.1977 Zw / gr 809834/0078