COMBINE HARVESTER

Description

Combine harvester

[0001] The invention relates to a combine harvester with a radial distributor, which has a housing and two throwing rotors in the housing, wherein the throwing rotors each have at least two paddles and are arranged in a ejection plane so as to be rotatable in opposite directions about two rotor axes perpendicular to the ejection plane, and wherein the housing has an inlet for straw in an upper side and partially encloses the paddles parallel to the ejection plane and in a direction of travel of the combine harvester and is open against the direction of travel for ejecting the straw in the ejection plane.

[0002] Such a combine harvester is known from EP 2 347 645 A1. On the known combine harvester, a lateral gap between the housing and one end of the paddles facing away from the rotor axis has bulges running parallel to the discharge plane, which prevent the straw from becoming trapped between the paddles and the housing.

[0003] In the known combine harvester, straw can become jammed in a gap between the top and the paddles at the inlet to the ejector rotors. Another combine harvester is known from US2018 / 007831. Task

[0004] The invention is based on the object of preventing straw from jamming at the inlet to the throwing rotors. Solution

[0005] Based on the known combine harvester, the invention proposes that an upper gap between the paddles and the upper side be at least twice as large, at least in some sections, as a lower gap between the paddles and a bottom of the housing. Combine harvesters are machines for continuously mowing grain from a field, threshing the grain, and separating grains and straw. The radial distributor serves to distribute the straw across the field. The significantly enlarged upper gap prevents straw from jamming at the inlet to the throwing rotors.

[0006] Preferably, on a combine harvester according to the invention, the upper gap widens in a wedge shape in the radial direction. Furthermore, on a combine harvester according to the invention, the upper gap has a constant width in a region facing the rotor axis. The region with a constant width and the adjoining wedge shape account for the risk of jamming, which increases with the distance from the rotor axis. As an alternative to the wedge shape, the gap can, for example, have a second region with a constantly increased width or a combination of both shapes.

[0007] Preferably, the paddles on a combine harvester according to the invention are made of cast steel. This material allows the paddles to be used for all types of crops.

[0008] Preferably, a combine harvester according to the invention has a chopper for chopping the straw above the radial distributor and an outlet for the chopped straw from the chopper into the inlet of the throwing rotors. The chopped straw can be better incorporated into the soil.

[0009] Preferably, in a combine harvester according to the invention, the upper gap, the lower gap, and a lateral gap between the paddles and a guide surface comprise 15 to 30% of the cross-section of the housing. The air cushion created by the paddles rotating around the distribution axis in the radial distributor then least impedes the introduction of straw into the radial distributor.

[0010] Preferably, the housing of a combine harvester according to the invention has a cylindrical shape. This cylindrical shape is particularly easy to manufacture from a technical perspective.

[0011] Preferably, on a combine harvester according to the invention, the paddles have bulges running parallel to the discharge plane on a face facing away from the rotor axis. The comb-like shape of the paddles prevents the straw from becoming trapped in the lateral gap between the face of the paddles and the guide surface of the housing.

[0012] Preferably, the protrusions on a combine harvester according to the invention are wedge-shaped. The wedge-shaped tips on the front side of the paddle thus exhibit particularly high mechanical stability. Example

[0013] The invention is explained below using an exemplary embodiment. The following are shown schematically in Figure 1 a rear of a combine harvester according to the invention, in Figure 2 a radial distributor in the rear and in Figure 3 a throwing rotor of the radial distributor.

[0014] A combine harvester according to the invention (not shown further) has a chopper 2 and a radial distributor 3 at the rear 1. The combine harvester travels across a field 5 in a direction of travel 4, mows grain from the field 5, threshes it, and thus separates the grains from straw and chaff. The grain, grains, straw, and chaff are not shown.

[0015] The chopper 2 has four rows of knives 7 in a cylindrical housing 6, which are rotatable about an axis 8 running horizontally transversely to the direction of travel 4 and in the process chop the straw and convey it through an outlet 9 out of the housing 6 and into the radial distributor 3.

[0016] The radial distributor 3 has two throwing rotors 10 next to each other, each with a housing 11, and in the housing 11 six paddles 13 rotatable in opposite directions about two rotor axes 12 running transversely to the axis 8 of the chopper 2. The housing 11 encloses the rotating paddles 13 of the throwing rotor 10 in a cylindrical shape in the direction of travel 4, has a guide surface 14 running parallel to the rotor axis 12 and on its upper side 15 an inlet 16 open to the chopper, and is open against the direction of travel 4 in an ejection plane 17 lying transversely to the rotor axis 12.

[0017] The paddles 13 are made of cast steel plates and are attached to the rotor axis 12 on a rotor core (not shown). The paddles 13 are designed in a comb-like manner with six wedge-shaped prongs 20 each, extending from the guide surface 14. The bulges 21 of the gap between the prongs 20 have an opening angle 22 of 24°.

[0018] The paddles 13 have an upper gap 24 to the top side 15 of the housing 11, a lower gap 26 with a width 27 to a bottom side 25, and a lateral gap 28 to the guide surface 14. The upper gap 24 is wedge-shaped with a wedge angle 31 of 8° adjacent to a region 30 facing the rotor axis 12. The upper gap 24, the lower gap 26, and the lateral gap 28 together comprise 15% of the cross-sectional area of ​​the housing 11, and the paddles 13 comprise 85%.

[0019] The radial distributor pivots around the chopper axis: In the "road travel" position, the discharge plane 17 is inclined upwards, in the "swath deposit" position it is steeply inclined downwards, and in the "chop" position it is less inclined downwards. The "road travel" and "swath deposit" positions are not shown.

[0020] In chopper mode, the crop flow of chopped straw and chaff from the chopper 2 is transferred directly into the inlet 16 of the radial distributor 3. The two throwing rotors 10 receive the crop flow of chopped straw and chaff and distribute it across the working width of the combine harvester. List of reference symbols

[0021] 1Tail 2Chopper 3Radial distributor 4Direction of travel 5Field 6Chopper housing 7Row of knives 8Axle 9Outlet 10Discharge rotor 11Housing 12Rotor axis 13Paddle 14Guide surface 15Top 16Inlet 17Discharge plane 20Tines 21Bulge 22Opening angle 24Upper gap 25Bottom 26Lower gap 27Width 28Side gap 30Area 31Wedge angle

Claims

1. A combine harvester with a radial distributor (3) which has a housing (11) and two discharge rotors (10) in the housing (11), wherein the discharge rotors (10) respectively have at least two paddles (13) and are disposed in a discharge plane (17) for opposing rotary movement about two rotor axes (12) disposed at right angles to the discharge plane (17), and wherein the housing (11) has an inlet (16) in an upper side (15) for straw and partially encloses the paddles (13) parallel to the discharge plane (17) and in a direction of travel (4) of the combine harvester and is open in the opposite direction to the direction of travel (4) for discharging the straw in the discharge plane (17), characterized in that at least in sections, an upper gap (24) between the paddles (13) and the upper side (15) is at least double the size of a lower gap (26) between the paddles (13) and a lower side (25) of the housing (11), wherein the upper gap (24) has a constant width (27) in a region (30) facing the rotor axis (12).

2. The combine harvester according to the preceding claim, characterized in that the upper gap (24) widens in a V-shape in the radial direction.

3. The combine harvester according to one of the preceding claims, characterized in that the paddles (13) are fabricated from cast steel.

4. The combine harvester according to one of the preceding claims, characterized by a chopper (2) above the radial distributor (3) for chopping the straw and an outlet (9) letting the chopped straw out of the chopper (2) into the inlet (16) of the discharge rotors (10).

5. The combine harvester according to one of the preceding claims, characterized in that the upper gap (24), the lower gap (26) and a lateral gap (28) between the paddles (13) and a guide surface (14) together comprise 15 to 30% of a cross section of the housing (11).

6. The combine harvester according to one of the preceding claims, characterized in that the housing (11) has a cylindrical shape.

7. The combine harvester according to one of the preceding claims, characterized in that on an end face facing away from the rotor axis (12), the paddles (13) have indentations (21) which extend parallel to the discharge plane (17).

8. The combine harvester according to the preceding claim, characterized in that the indentations (21) are V-shaped in configuration.