General-purpose combine thresher device

Abstract

To mitigate a thresher work load by reducing re-selection of the threshed object by equalizing the threshed object that drop from a threshing cylinder of a threshing chamber onto a selection shelf in an entire right-left of a swing selection device.SOLUTION: In a thresher device of a general-purpose combine in which the reaped grain culm by a reap pretreatment device 3 provided at a front part of a machine body is taken into a threshing chamber 10 of a thresher device 4, a grain is selected out from the grain culm between a threshing cylinder 11 and a receiving net 12 provided to a part of a periphery of the threshing cylinder 11, and dropped onto a swing selection device 21 on a lower side. The device is composed of: an arc-shaped cross-rail plate 12A that crosses the receiving net 12 in an axial direction of the threshing cylinder 11; and a vertical linear material 12B provided along an axial direction of the threshing cylinder 11 while penetrating through the cross-rail plate 12A. For the width from an inner peripheral edge 12A1 of the cross-rail plate 12A to the vertical linear member 12B, the bottom width L2 at the bottom part thereof is made larger than the side width L1 at a right-left side part of the receiving net 12.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a threshing device mounted on a general-purpose combine harvester. [Background technology]

[0002] As described in JP 2016-187327 A and JP 2014-14322 A, a general-purpose combine harvester uses a pre-harvesting processing device to harvest stalks growing in a field, then feeds the stalks into a threshing device to thresh and separate the grains, which are then stored in a grain tank, and the threshed waste stalks are discharged into the field.

[0003] The threshing device has a threshing drum with threshing teeth attached to its outer periphery, supported on a shaft within a threshing chamber. The grains are threshed from the stalks between the threshing drum and a threshing net attached to the lower half of the threshing drum, and the threshed grains drop from the threshing net into a oscillating sorting device below where they are sorted. The grains are then collected in a grain tank and harvested. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-187327 A [Patent Document 2] JP 2014-14322 A Summary of the Invention [Problem to be solved by the invention]

[0005] The amount of grain that leaked from the handling net onto the sorting shelf was greater on the left and right side walls of the handling room than in the center, so the amount on the sorting shelf was not uniform, resulting in insufficient sorting of grain.In other words, because the amount of grain that fell from the handling net was almost the same, there was inevitably a lot of grain on the left and right sides of the sorting shelf.

[0006] The present invention aims to reduce the load on threshing by equalizing the amount of threshed grain that leaks from the handling net in the handling chamber onto the sorting shelf across the entire left and right sides of the oscillating sorting device, thereby reducing the need for re-sorting of threshed grain. [Means for solving the problem]

[0007] The above-mentioned object of the present invention is achieved by the following technical means.

[0008] The invention of claim 1 is a threshing device for a general-purpose combine that takes in the stalks harvested by a pre-harvest processing device 3 installed at the front of the body into the threshing chamber 10 of the threshing device 4, and handles the grains from the stalks between the threshing drum 11 and a receiving net 12 installed around a part of the periphery of the threshing drum 11, causing them to leak onto the oscillating sorting device 21 below.The receiving net 12 is composed of an arc-shaped horizontal bar plate 12A that intersects with the axial direction of the threshing drum 11 and vertical wires 12B that penetrate the horizontal bar plate 12A and are installed along the axial direction of the threshing drum 11, and the engagement width from the inner peripheral edge 12A1 of the horizontal bar plate 12A to the vertical wires 12B is a bottom engagement width L2 at the bottom that is wider than the side engagement width L1 at the left and right sides of the receiving net 12.

[0009] The invention of claim 2 is a threshing device for a general-purpose combine described in claim 1, characterized in that the engagement width between the inner peripheral edge 12A1 of the horizontal bar plate 12A and the vertical wire 12B gradually widens from the side to the bottom of the threshing drum 11.

[0010] The invention of claim 3 is a threshing device for a general-purpose combine described in claim 1, characterized in that the expansion rate of the engagement width from the inner peripheral edge 12A1 of the horizontal bar plate 12A to the vertical wire 12B toward the bottom is larger at the entrance side of the handling chamber 10 and smaller at the exit side. [Effects of the Invention]

[0011] In the invention of claim 1, the stalks sent to the threshing chamber 10 of the threshing device 4 are spirally sent between the threshing drum 11 and the receiving net 12 by the rotation of the threshing drum 11, and are threshed by the horizontal slat plate 12A, and the grains are separated and pass through between the vertical wires 12B and drop onto the oscillating sorting device 21. However, while the stalks pass through the side of the receiving net 12, the threshing action is weak because the side contact width L1 from the inner peripheral edge 12A1 of the horizontal slat plate 12A to the vertical wires 12B is small, and the threshing action is weak, so the stalks are not threshed. Since there are few grains passing through the bottom of the receiving net 12, and the bottom engagement width L2 from the inner peripheral edge 12A1 of the horizontal bar plate 12A to the vertical wire 12B is larger than the side engagement width L1, the grain threshing action is strong, many grains are handled, and more threshed grains leak into the oscillating sorting device 21, and the threshed grains are uniform across the entire left and right sides of the handling chamber 10, so that the grains are sorted well and less threshed grains need to be re-sorted, thereby reducing the driving load of the threshing device 4.

[0012] In the invention of claim 2, the amount of grain straw handled by the cross-section plate 12A gradually increases from the left and right sides of the handling chamber 10 to the bottom, and the amount of removed grain leaking onto the oscillating sorting device 21 becomes more uniform across the entire left and right sides of the handling chamber 10.

[0013] In the invention of claim 3, the stalks containing many ripe grains are sent into the handling chamber 10 and are handled strongly at the entrance side by the large bottom engagement width L2 of the cross-bar plate 12A, and gently at the exit side by the small bottom engagement width L2, thereby averaging out the shed grains leaking from the entrance side to the exit side of the oscillating sorting device 21, thereby improving the sorting of the grains. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of a combine harvester according to an embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a longitudinal cross-sectional view of the threshing device of the combine harvester. [Figure 5] (A) and (B) are perspective views of the threshing drum of the same threshing device. [Figure 6] FIG. [Figure 7] FIG. 2 is an exploded perspective view of the threshing device; [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] As shown in Figures 1 to 3, a multi-purpose combine harvester has a traveling device 2 consisting of a pair of left and right crawlers that travels on the soil surface, mounted on the underside of a machine frame 1, a pre-harvesting device 3 that harvests and cuts stalks in the field, mounted on the front of the machine frame 1, a threshing device 4 that threshers and sorts the harvested stalks, mounted on the rear left side of the pre-harvesting device 3, and a control unit 5 on which an operator sits, mounted on the rear right side of the pre-harvesting device 3. A solar panel 60 is mounted on the top surface of a cabin 59 surrounding the control unit 5, and electricity generated from sunlight is used to charge a battery.

[0016] An engine room 6 that houses the engine is provided below the control unit 5, a grain tank 7 that stores threshed and sorted grain is provided behind the control unit 5, and a discharge auger 8 that can be raised and lowered behind the grain tank 7 to discharge the grain to the outside.

[0017] The pre-harvesting processing device 3 is composed of a conveying device 3A that transports the stalks in the field to the rear while standing them up, a cutting blade device 3B that cuts the base of the stalks transported to the rear lower part of the conveying device 3A, an auger device 3C that gathers the stalks transported to the rear side of the conveying device 3A to the left side, and a feeder house 3D that transports the gathered stalks to the threshing device 4.

[0018] As shown in FIG. 4, the threshing device 4 is formed of a threshing chamber 10 for threshing stalks and a sorting chamber 20 for sorting the threshed grains.

[0019] A threshing drum 11 for threshing the stalks transported from the feeder house 3D is installed on the front and rear walls of the threshing chamber 10, and a receiving net 12 formed in a semicircular arc along the lower outer periphery of the threshing drum 11 is installed on the underside of the threshing drum 11. The upper part of the threshing drum 11 is covered with an openable threshing drum cover 13 (Fig. 3), and a dust conveying plate (not shown) for guiding the stalks to the rear of the threshing chamber 10 is installed on the inner periphery of the threshing drum cover 13.

[0020] An oscillating sorting device 21 is provided above the sorting chamber 20 to sort grains leaking from the handling chamber 10. The lower part of the oscillating sorting device 21 is provided, in this order from the front, with a winnower 25 that blows sorting air into the oscillating sorting device 21, a wind divider 26 that changes the blowing direction of the sorting air behind the winnower 25, a first spiral 27 that transports grains leaking from the oscillating sorting device 21 to the grain tank 7, and a second spiral 28 that re-transports grains with rachis branches and the like attached that leak from the rear of the oscillating sorting device 21 to the sorting shelf at the front of the oscillating sorting device 21.

[0021] As shown in Figures 5 and 6, the handling drum 11 is formed from a rotating shaft 30 that is rotatably mounted on the front and rear walls of the handling chamber 10, and a truncated conical impeller 31 and rotor 32 supported at the front of the rotating shaft 30.

[0022] The impeller 31 is formed from a circular front plate 40, a circular rear plate 41 having a larger diameter than the front plate 40, and side plates 42 connecting the outer peripheries of the front plate 40 and the rear plate 41.

[0023] A pair of upper and lower conveying spirals 43 are provided on the outer peripheral surface of the side plate 42 to convey the stalks conveyed to the front part of the impeller 31 to the rear part of the impeller 31. This allows the stalks conveyed to the impeller 31 to be efficiently conveyed from the front part to the rear part of the impeller 31 and transferred to the rotor 32.

[0024] On the front surface of the conveying spiral 43, approximately triangular reinforcing ribs 44 are provided at a predetermined angle in the circumferential direction to connect the side plate 42 and the lower front surface of the conveying spiral 43. This increases the rigidity of the conveying spiral 43 and makes it possible to suppress deformation of the conveying spiral 43 due to the load applied to the conveying spiral 43 from the stalks.

[0025] The rotor 32 is divided into two parts in the front-rear direction and is formed of a front rotor 32A provided on the rear side of the impeller 31, and a rear rotor 32B provided on the rear side of the front rotor 32A. It is also possible to form the rotor 32 as a single unit without dividing it into two parts in the front-rear direction.

[0026] The front rotor 32A is provided between the rear plate 41 of the impeller 31 and an intermediate plate 35 provided in the middle of the rotary shaft 30, and the rear rotor 32B is provided between the intermediate plate 35 of the rotary shaft 30 and a rear plate 36 of the rotary shaft 30. The intermediate plate 35 stands on the outer peripheral surface of an intermediate support member 34 that is provided in the middle of the rotary shaft 30 in the front-rear direction and has a hexagonal vertical cross section in the left-right direction.

[0027] The front rotor 32A is formed from six bar frames 50 extending in the front-rear direction, three front-rear frames 51 extending in the front-rear direction, and an outer ring 52 supported at a predetermined interval in the front-rear direction by the front-rear frames 51. Fig. 5(A) shows an enlarged view of a portion of the outer ring 52.

[0028] Similarly, the rear rotor 32B is formed from six bar frames 50 extending in the fore-and-aft direction, three front-and-aft frames 51 extending in the fore-and-aft direction, and an outer ring 52 supported on the front-and-aft frames 51 at a predetermined interval in the fore-and-aft direction.

[0029] The receiving net 12 is a net that surrounds part of the periphery of the handling drum 11 in an arc shape, and as shown in Figure 7, is composed of left and right front nets 12F1, 12F2 and left and right rear nets 12R1, 12R2, each of which is formed into a net shape by connecting multiple horizontal bar plates 12A made of arc-shaped band iron within an enclosing frame 12W with vertical wire material 12B made of piano wire that runs along the axial direction of the handling drum 11, and is attached to surround the handling drum 11 so that it can be removed from the handling chamber 10 as needed for maintenance.

[0030] More specifically, a single net is shown in Figure 8. Three of these single nets are used to form the left front net 12F1, and so twelve single nets are used to form the left and right front nets 12F1, 12F2 and the left and right rear nets 12R1, 12R2, which make up the entire receiving net 12. This single net is formed in a net-like shape overall with many vertical wires 12B penetrating many horizontal bar plates 12A arranged at regular intervals, and at the positions where the vertical wires 12B penetrate the horizontal bar plates 12A, the engagement width L1 from the inner peripheral edge 12A1 to the vertical wires 12B is narrow on the left and right sides (Figure 9), and the engagement width L2 from the inner peripheral edge 12A1 to the vertical wires 12B is wide on the bottom side (Figure 10). As a result, when the grain stalks rotate on the handling drum 11, they are not handled much at the sides due to the side engagement width L1, and less of the culls fall between the vertical wires 12B, while at the bottom they are handled strongly due to the bottom engagement width L2 of the horizontal bar plate 12A, and more of the culls fall between the vertical wires 12B.This means that the culls on the oscillating sorting device 21 are leveled on the left and right sides of the handling chamber 10, resulting in better grain sorting.

[0031] This can be configured such that horizontal rib plates 12A are arranged in the circumferential direction of the threshing drum 11 and vertical wires 12B are arranged parallel to the axial direction of the threshing drum 11 (the embodiment in Figure 7), or such that vertical wires 12B are arranged in the circumferential direction of the threshing drum 11 and horizontal rib plates 12A are arranged parallel to the axial direction of the threshing drum 11 (the embodiment in Figure 8). In the embodiment in Figure 8, the grains are threshed mainly by colliding with the horizontal rib plates 12A, which increases the resistance to threshing. For this reason, this is suitable for varieties that are difficult to thresh.

[0032] The relationship between the engagement width L1 in FIG. 9 and the engagement width L2 in FIG. 10 can also be applied to the configuration in FIG. 8, and the same effect can be obtained.

[0033] Furthermore, if the narrow side engagement width L1 range is inclined 30 degrees from vertical and the wide bottom engagement width L2 is the remaining bottom range, or if the narrow side engagement width L1 gradually transitions to the wide bottom engagement width L2, the grain removed from the oscillating sorting device 21 will be more evenly distributed on the left and right sides of the handling chamber 10.

[0034] In addition, by increasing the bottom contact width L2 at the entrance side of the handling chamber 10 and decreasing the bottom contact width L2 at the exit side, the rearward discharge of the straws can be smoothed, which is expected to reduce the threshing load.

[0035] In another embodiment, if the distance between the inner peripheral edge 12A1 of the cross-section plate 12A of the receiving net 12 and the rotor 32 of the threshing drum 11 is narrower at the bottom than at the sides of the receiving net 12, a large discharge rod will be sent by the threshing drum 11 at the bottom, and many small grains such as cereal grains will leak out, improving the sorting of the grains. [Explanation of symbols]

[0036] L1 Side width L2 bottom width 3 Pre-harvest processing equipment 4. Threshing equipment 10 Handling room 11 Thrusting body 12 Receiving net 12A Crosspiece Plate 12A1 Inner edge 12B vertical wire 21. Shaking sorting device

Claims

1. This threshing device for a general-purpose combine harvester takes in stalks harvested by a pre-harvesting treatment device (3) installed at the front of the machine body and takes in the handling chamber (10) of the threshing device (4), where the grains are handled from the stalks between a threshing drum (11) and a receiving net (12) installed around a portion of the periphery of the threshing drum (11) and allowed to drip onto a swinging sorting device (21) below. The receiving net (12) is composed of an arc-shaped horizontal crossbar plate (12A) that intersects with the axial direction of the threshing drum (11) and vertical wires (12B) that penetrate the horizontal crossbar plate (12A) and are installed along the axial direction of the threshing drum (11). The threshing device for a general-purpose combine harvester is characterized in that the engagement width from the inner peripheral edge (12A1) of the horizontal crossbar plate (12A) to the vertical wires (12B) is set so that the bottom engagement width (L2) at the bottom of the receiving net (12) is wider than the side engagement width (L1) at the left and right sides.

2. 2. The threshing device of a general-purpose combine harvester according to claim 1, wherein the engagement width between the inner peripheral edge (12A1) of the horizontal plate (12A) and the vertical wire (12B) is gradually increased from the side to the bottom of the threshing body (11).

3. A threshing device for a general-purpose combine harvester as described in claim 1, characterized in that the expansion rate of the engagement width from the inner peripheral edge (12A1) of the horizontal bar plate (12A) to the vertical wire (12B) toward the bottom changes from a larger expansion rate at the entrance side of the handling chamber (10) to a smaller expansion rate at the exit side.

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