Combine

Abstract

To provide an advantageous combine harvester.SOLUTION: A combine harvester 100 includes: a threshing device 3 for threshing crop plants; and an oscillation sorting device 41 for oscillating and sorting threshing objects which have been threshed by the threshing device 3. The oscillation sorting device 41 includes: a chaff sieve 412 for sieving threshing objects; and a grain sieve 416 (first sieve part) disposed downward the chaff sieve 412 and further sorting the threshing objects which have been sorted by the chaff sieve 412. The grain sieve 416 (first sieve part) is constituted of a front sieve part 4160 and a rear sieve part 4161.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a combine harvester.

Background Art

[0002] As shown in Patent Document 1, a conventional combine harvester includes a chaff sieve that roughly sorts threshed material by swinging back and forth, a grain sieve (Gurney sieve) disposed below the chaff sieve and finely sorting the threshed material by swinging, and a guide plate that guides the grains that have passed through the grain sieve to a screw conveyor for transporting the top grains. In a plan view, a gap is formed between the rear end of the grain sieve and the rear end of the guide plate.

[0003] When the object to be sorted is paddy rice, the chaff sieve can sort the grains and impurities, and most of the materials reaching the grain sieve are grains. Even if an impurity reaches the grain sieve, it can be blown away by the wind, so even if there is a gap between the rear end of the grain sieve and the rear end of the guide plate, sorting failure does not occur.

[0004] However, depending on the object to be sorted, sorting may not be possible in some cases.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present disclosure is to provide a useful combine harvester.

Means for Solving the Problems

[0007] The combine of the present disclosure includes a threshing device for threshing crops, and a swinging sorting device for swing-sorting the threshed product threshed by the threshing device. The swinging sorting device includes a first conveying unit for conveying the threshed product to the grain tank, a second conveying unit for returning the threshed product to the front end side of the threshing device or the swinging sorting device, a first sieve unit located above the first conveying unit for distributing the threshed product to the first conveying unit or the second conveying unit, and a guiding unit for guiding the threshed product passing through the first sieve unit to the first conveying unit. The rear end of the first sieve unit is located behind the rear end of the guiding unit.

[0008] According to this configuration, since the material falling from the rear end of the first sieve unit does not reach the guiding unit, it is possible to avoid a part of the crops that should not be conveyed to the grain tank from being guided to the first conveying unit, and it is possible to improve the sorting performance.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5A

Figure 5B

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0010] An example of the combine according to the present disclosure will be described.

[0011] [Overall Structure of Combine] First, the overall structure of the combine will be briefly described. FIGS. 1 to 3 show the left side, right side, and plan view of the combine 100 of the present embodiment, respectively. In the figures, the front-rear direction, left-right direction, and up-down direction of the combine 100 are indicated by arrows. The combine 100 includes a traveling device 1, a harvesting device 2, a threshing device 3, a sorting device 4, a storage device 5, and a power device 6.

[0012] The traveling device 1 is provided below the machine body frame 10. The traveling device 1 has a transmission 11 and a pair of left and right crawler devices 12. The transmission 11 transmits the power of the power device 6 mounted on the machine body frame 10 to the crawler device 12. The crawler device 12 travels the combine 100 in the front-rear direction or turns the combine 100 in the left-right direction.

[0013] The harvesting device 2 is provided in front of the traveling device 1. The harvesting device 2 has a reel 21, a cutter (harvesting blade) 22, an auger (lateral feed screw) 23, and a conveying conveyor 24. The reel 21 guides the cereal straw in the field to the cutter 22 by rotating. The cutter 22 cuts the cereal straw guided by the reel 21. The auger 23 gathers the cereal straw cut by the cutter 22 at a predetermined position (the cereal straw supply port of the conveying conveyor 24). The conveying conveyor 24 conveys the cereal straw gathered by the auger 23 to the front rotor 33 (see FIG. 4) of the threshing device 3.

[0014] The threshing device 3 is located behind the cutting device 2 and is arranged on one side in the left - right direction (the left side in this embodiment). The threshing device 3 has a handling cylinder 31 and a receiving net 32 provided below the handling cylinder 31. The handling cylinder 31 is housed in a handling chamber 30 (see FIG. 4). The handling cylinder 31 rotates to convey the cereal straws rearward while threshing them. The receiving net 32 supports the cereal straws conveyed by the handling cylinder 31 and drops the threshed product onto the sorting device 4. Below the handling cylinder 31, a first conveyor 143 and a second conveyor 144 (see FIG. 4), which are screw conveyors for conveying grains, are provided. Both of them convey the threshed product in the horizontal direction (left - right direction).

[0015] The sorting device 4 is provided below the threshing device 3. The sorting device 4 has a swing sorting device 41 that swings in the front - rear direction to swing - sort the threshed product that has leaked from the receiving net 32. The grains sorted by the swing sorting device 41 are conveyed by the first conveyor 143 and the elevating conveyor 151 and are put into the grain tank 51 through the inlet 153. Also, the sorting device 4 has a blower device 42 that blows air toward the swing sorting device 41. The blower device 42 blows away impurities such as straw debris contained in the threshed product. The impurities such as straw debris are discharged to the outside from a straw discharge port 45 provided behind the sorting device 4.

[0016] The storage device 5 is located behind the cutting device 2 and is arranged on the other side in the left - right direction (the right side in this embodiment). The storage device 5 is provided adjacent to the threshing device 3 in the left - right direction. The threshing device 3, the sorting device 4, and the storage device 5 are arranged in parallel left - right above the body frame 10. The storage device 5 includes a grain tank 51 for storing grains. The grain tank 51 stores the grains conveyed from the sorting device 4 via the first conveyor 143 and the elevating conveyor 151. The grain tank 51 is rotatably supported with respect to the body frame 10 around the vertical axis core 51p at its rear end. When discharging the grains in the grain tank 51, a discharge auger 52 is used. The discharge auger 52 is configured to be rotatable in the up - down, left - right directions and can discharge the grains to any place.

[0017] The power unit 6 is provided below the operation unit 13 and in front of the storage device 5. The power unit 6 is composed of an engine 61. The engine 61 in this embodiment is a diesel engine, which converts the thermal energy obtained by burning fuel into kinetic energy. More specifically, the engine 61 converts the thermal energy obtained by burning fuel into power for driving each part such as the traveling device 1. The power unit 6 may be an electric motor that generates power by electricity. Further, the power unit 6 may be provided with both the engine 61 and an electric motor.

[0018] The operation unit 13 is provided in the front right part of the body frame 10 in front of the grain tank 51. The operation unit 13 is covered by a cabin 14, and the grain tank 51 is provided behind the cabin 14. Although not shown in the drawings, inside the cabin 14, there are provided a driver's seat on which an operator sits and a steering wheel arranged in front of the driver's seat, and various operating tools such as a shift lever, a clutch lever, and switches are arranged around them.

[0019] [Threshing device] Next, the threshing device 3 will be described. As shown in FIG. 4, the threshing device 3 has a handling chamber 30, a handling cylinder 31, a receiving net 32, and a front rotor 33. The handling chamber 30 is partitioned and formed by the receiving net 32, the machine frame 300, etc. The machine frame 300 is attached with an upper cover 301 arranged above the handling cylinder 31, a front wall member 302 arranged in front of the handling cylinder 31, and a rear wall member 303 arranged behind the handling cylinder 31. The grain straw conveyed by the conveying conveyor 24 is sent into the handling chamber 30 by the front rotor 33. The front rotor 33 not only conveys the grain straw but also has a function of performing preliminary threshing (pre-threshing).

[0020] The handling cylinder 31 has a handling cylinder axis 311 extending along the front-rear direction, a scraping screw 312, and a two-tooth bar (handling tooth support member) 313. The handling cylinder 31 rotates about the handling cylinder axis 311. The handling cylinder axis 311 is rotatably supported by the front wall member 302 and the rear wall member 303. Rotational power from the engine 61 is transmitted to the handling cylinder axis 311. The handling cylinder axis 311 is a linearly formed structure that supports the scraping screw 312 and a plurality of two-tooth bars 313.

[0021] The scraping screw 312 is disposed at the front portion of the handling cylinder 31. The scraping screw 312 is a structure in which a spiral impeller (scraping blade) 312b is detachably formed. The scraping screw 312 scrapes the grain straw fed by the front rotor 33. That is, the scraping screw 312 rotates to take in the grain straw fed by the front rotor 33 and send it rearward. The scraping screw 312 is not limited to a structure in which a spiral impeller 312b is formed, and a structure in which a plurality of blades are formed may also be acceptable.

[0022] A plurality of two-tooth bars 313 are disposed around the handling cylinder axis 311 behind the scraping screw 312. The two-tooth bar 313 is a structure in which a plurality of handling teeth 313t are arranged in parallel with a predetermined interval therebetween. The two-tooth bar 313 threshes the grain straw sent out by the scraping screw 312. That is, the two-tooth bar 313 rotates to knead and strike the grain straw sent out by the scraping screw 312 to drop the threshed grains. The two-tooth bar 313 is not limited to a structure having a plurality of handling teeth 313t, and a structure having a spiral blade may also be acceptable. In the present embodiment, a rotating body having a cylindrical shape as a whole is configured by separating the internal space of the handling cylinder 31 and the external space of the handling cylinder 31 by a plurality of two-tooth bars 313 and a plurality of plate members 314 provided across the two-tooth bars 313. Instead of this, a structure in which a cylindrical rotating body is provided with a plurality of handling teeth 313t may also be acceptable.

[0023] The receiving net 32 is provided along the lower outer peripheral surface of the handling cylinder 31 and is formed in a substantially U shape when viewed from the front-rear direction. In the present embodiment, the receiving net 32 is arranged so as to cover the lower part of a rotating body constituted by a plurality of two-tooth bars 313. The receiving net 32 supports the cereal straws kneaded by the two-tooth bars 313. The receiving net 32 is mainly constituted by a net body 321. The net body 321 is a structure formed by stretching wires in parallel at a predetermined interval. The receiving net 32 allows the threshed product threshed by the handling cylinder 31 to leak through the gaps of the net body 321. The cereal straws that did not leak from the receiving net 32 are discharged as discharged straws from the rear end portion of the receiving net 32.

[0024] [Sorting device] Next, the sorting device 4 will be described. As shown in FIG. 4, the sorting device 4 includes a swing sorting device 41 and a blowing device 42. The swing sorting device 41 sorts the grains by sieving the threshed product. The blowing device 42 sorts the grains by blowing off impurities such as chaff contained in the threshed product.

[0025] The swing sorting device 41 has a feed pan 411, a chaff sieve 412, and a perforated rack 413. The feed pan 411, the chaff sieve 412, and the perforated rack 413 are attached and supported to a swing frame 415 as shown in FIG. 5A. In the present embodiment, the chaff sieve 412 is arranged behind the feed pan 411, and the perforated rack 413 is arranged behind the chaff sieve 412. Below the rear part of the swing sorting device 41, an eccentric cam type swing drive mechanism 410 that swings back and forth in conjunction with the rotation of a shaft 41a extending in the left-right direction is provided. The swing frame 415 is configured to be swingable back and forth by the swing drive mechanism 410.

[0026] The feed pan 411 is a structure formed wide and flat. The feed pan 411 receives the threshed product that has fallen from the receiving net 32. The feed pan 411 moves backward while leveling the threshed product on the feed pan 411 by swinging back and forth. At this time, the threshed product is evenly spread in the left-right direction by fins 411f attached obliquely.

[0027] The chaff sieve 412 has a plurality of sieve plates 412p arranged in parallel with each other at a predetermined interval. The plurality of sieve plates 412p are arranged side by side in the front-rear direction while extending along the left-right direction. The angle of the sieve plate 412p can be adjusted according to the amount of threshed material. The chaff sieve 412 sifts the threshed material sent from the feed pan 411 by swinging back and forth, floating the mixed impurities and separating them from the grains. The threshed material remaining on the chaff sieve 412 moves backward and is sent to the perforated rack 413. The threshed material (which has become grains and a small amount of impurities) selected by the chaff sieve 412 reaches the grain sieve 416 which is a screening section. The threshed material (the "most processed material" which is only grains) that has passed through the grain sieve 416 is guided by the first class grain plate 431 (guide part) and falls into the first trough 43, and is sent to the first conveyor 143 (first conveying section). The threshed material remaining on the grain sieve 416 moves backward and reaches the second class grain plate 441, falls into the second trough 44 under the guidance of the second class grain plate 441, and is reductively conveyed to the front end side of the shaking sorting device 41 by the second conveyor 144 (second conveying section) and is subjected to the sorting process again.

[0028] The perforated rack 413 is supported by the swing frame 415 and is positioned above the second conveyor 144 (second conveying section) as shown in FIGS. 4, 5A, and 5B, and distributes the threshed material to the second conveyor 144 or outside the machine. The perforated rack 413 has a flat plate portion 413a in which a plurality of circular leakage holes 413h are formed, and a crossbar 413b extending in the front-rear direction for reinforcing the flat plate portion 413a. As shown in FIG. 5B, leakage holes 413h penetrating both members are formed in the overlapping portion of the flat plate portion 413a and the crossbar 413b. Since leakage holes 413h are also formed in the crossbar 413b, it suppresses blocking the sorting air. By swinging back and forth, the perforated rack 413 sifts the threshed material sent from the chaff sieve 412, supports the relatively large contaminants mixed therein, and separates them from the grains. The threshed material (the "second processed material" which is grains and a small number of small contaminants) sorted by the perforated rack 413 is guided by the second grain chute 441 and falls into the second trough 44, and is conveyed back to the front end side of the swing sorting device 41 by the second conveyor 144 and is subjected to the sorting process again. The threshed material remaining on the perforated rack 413 moves backward and is discharged outside the machine.

[0029] The air blower 42 is disposed below the front part of the oscillating sorting device 41 and supplies sorting air toward the oscillating sorting device 41. The air blower 42 includes a fan 421 and a fan case 422. In the present embodiment, the fan 421 is disposed below the feed pan 411, and the fan case 422 is disposed so as to cover the fan 421. The fan 421 has a plurality of fan plates 421p attached at a predetermined angle. By rotating to send out air, the fan 421 blows away the impurities placed on the chaff sieve 412 and the perforated rack 413 and the impurities that have fallen from them. The fan case 422 is a structure formed by bending a plate material. The fan case 422 covers the fan 421 and guides the air sent out by the fan 421 in a predetermined direction. In addition, in order to supplement the air blowing by the first fan 421, a second fan 423 is provided behind the first fan 421. The air sent out from the second fan 423 is supplied to the perforated rack 413 and contributes to the sorting of the threshed product on the perforated rack 413.

[0030] [Grain Sieve and Peripheral Structure] The oscillating sorting device 41 includes a first conveyor 143 (first conveying unit) that conveys the threshed product to the grain tank 51, a second conveyor 144 (second conveying unit) that returns the threshed product to the front end side of the oscillating sorting device 41, a grain sieve 416 (first sieving unit), and a first grain guide plate 431 (guiding unit).

[0031] As shown in FIGS. 4 and 6, the grain sieve 416 is positioned above the first conveyor 143 (the first conveying unit), and distributes the threshed material to the first conveyor 143 or the second conveyor 144. A chaff sieve 412 is arranged above the grain sieve 416, and the grain sieve 416 further sorts the threshed material sorted by the rocking of the chaff sieve 412. The grain sieve 416 has a plate-shaped portion in which a plurality of leakage holes 416h (see FIGS. 8A, 8B, and 9) are formed to sort the two by allowing the grains to be stored in the grain tank 51 to pass through and not allowing foreign matters other than the grains (buds and immature fruits in the case of soybeans) to pass through. The shape and size of the leakage holes 416h are appropriately set according to the type of crop. The grain sieve 416 is supported by a rocking frame 415.

[0032] As shown in FIGS. 4 and 6, the rear end 416r of the grain sieve 416 is located behind the rear end 431r of the first grain guide plate 431 (the guiding portion). As a result, in plan view, the first grain guide plate 431 overlaps the grain sieve 416, and the threshed material falling from the rear end 416r of the grain sieve 416 does not reach the first grain guide plate 431 but reaches the second conveyor 144.

[0033] The grain sieve 416 has a front sieve portion 4160 and a rear sieve portion 4161 that is detachably attached to the rocking frame 415 and is continuous with the front sieve portion 4160. The rear end 416r of the rear sieve portion 4161 is located behind the rear end 431r of the first grain guide plate 431 (the guiding portion). The fact that the front sieve portion 4160 and the rear sieve portion 4161 are continuous means that they are in contact without a gap or overlap in plan view. By being continuous, the threshed material can be accurately transferred from the front sieve portion 4160 to the rear sieve portion 4161.

[0034] As shown in FIGS. 8A, 8B, and 9, sieve holes 416h are formed in the front sieve part 4160 and the rear sieve part 4161. The front sieve part 4160 has a flat plate part 4160a and a cross bar 4160b extending in the front-rear direction for reinforcing the flat plate part 4160a. Sieve holes 416h penetrating both members are formed at the overlapping part of the flat plate part 4160a and the cross bar 4160b. Since sieve holes 413h are also formed in the cross bar 4160b, it suppresses blocking the sorting air.

[0035] As shown in FIG. 9, the sieve holes 416h formed in the rear sieve part 4161 also serve to not block the air from the first fan 421. In the present embodiment, sieve holes 416h are formed in the rear sieve part 4161, but it is not limited thereto. For example, sieve holes 416h may not be formed in the rear sieve part 4161. Particularly in a combine having the second fan 423 constituting the blower 42 as in the present embodiment, by positioning the second fan 423 below the rear sieve part 4161 and in front of the rear end 416r of the rear sieve part 4161, the air of the second fan 423 is sent to the rear part (the perforated rack 413 and its vicinity) of the swing sorting device 41, so that the sorting ability can be ensured.

[0036] At the butting part of the front sieve part 4160 and the rear sieve part 4161, a rail part 4162 for guiding the movement along the left-right direction by contacting each other is provided. In the present embodiment, the cross-sectional L-shaped part extends in the left-right direction, but the shape is not limited thereto. The cross-sectional L-shaped part of the front sieve part 4160 is located above the cross-sectional L-shaped part of the rear sieve part 4161. By bringing the cross-sectional L-shaped parts (the rail parts 4162) into contact with each other, it functions as a rail part that enables the front sieve part 4160 to slide in the left-right direction with the rear sieve part 4161 as a support. Thereby, the attachment / detachment work of the front sieve part 4160 becomes easy.

[0037] As shown in FIG. 6, the rear sieving section 4161 rises upward as it extends rearward, forming a recess 4163 between it and the front sieving section 4160. By providing the recess 4163 in this way, impurities do not flow backward to the front sieving section 4160 and are temporarily retained, making it possible to improve the sorting performance. As shown in FIG. 6, the entire glen sieve 416 slopes upward toward the rear. Although it dips once in the rear sieving section 4161, the rear sieving section 4161 itself slopes upward toward the rear, so that the rear end 416r of the rear sieving section 4161 is positioned at the highest position in the entire glen sieve 416.

[0038] As shown in FIG. 6, the rear end 416r of the glen sieve 416 (the rear end 416r of the rear sieving section 4161) is positioned in front of the rear end 412r of the chaff sieve 412 and is also positioned in front of the front end 413f of the perforated rack 413. According to this configuration, even if the threshed product that has passed through the chaff sieve 412 falls through the gap between the chaff sieve 412 and the perforated rack 413, it does not reach the rear end 416r of the glen sieve 416 (the rear end 416r of the rear sieving section 4161), making it possible to prevent a large amount of threshed product from being supplied to the rear sieving section 4161.

[0039] In this embodiment, the glen sieve 416 is constituted by a plurality of sieving sections 4160 and 4161, but the glen sieve 416 may also be constituted by a single sieving section.

[0040] As shown in FIGS. 7 and 8A, the sieving section 4160 is detachably fixed to the swing frame 415 by bolts 72. As shown in FIGS. 7 and 9, the rear sieving section 4161 is fixed to the left and right fixing stays 4161a. A pair of swing side stays 417 are fixed to the swing frame 415 by welding. Bolt holes are formed in the fixing stays 4161a and the swing side stays 417, and the rear sieving section 4161, the fixing stays 4161a, and the swing side stays 417 are fixed to the swing frame 415 by bolts 73 inserted into these bolt holes.

[0041] As shown in FIGS. 7, 8A, and 9, the front sieving section 4160 and the rear sieving section 4161 are detachably configured via a maintenance opening 71 formed on the side of the machine cover 70 so as to be replaceable according to the type of crop to be sorted. The removal procedure is to remove a cover (not shown) that closes the maintenance openings 71 formed on the left and right sides of the machine cover 70. Next, as shown in FIG. 8A, remove the bolt 72 that fixes the front sieving section 4160 to the swing frame 415 via the maintenance opening 71. Then, if the front sieving section 4160 is slid laterally, it can be removed through the maintenance opening 71. Next, as shown in FIG. 9, remove the bolt 73 that fixes the swing side stay 417 and the fixing stay 4161a. Next, move the rear sieving section 4161 and the fixing stay 4161a forward so as not to interfere with the swing side stay 417, and then move them laterally, and they can be removed through the maintenance opening 71. Note that the first grain board 431 is fixed to the fixing stay 4161a, but since the first grain board 431 is a rubber board, it can be bent to pass through the maintenance opening 71.

[0042] The left photo in FIG. 11 shows the sorting result of a conventional combine without a rear sieving section. The right photo in FIG. 11 shows the sorting result of the combine of the present disclosure provided with a rear sieving section. It can be seen that the sorting result of the conventional combine includes buds and immature fruits and is not properly sorted. However, it can be seen that the sorting result of the combine of the present disclosure has almost no buds and immature fruits and is properly sorted.

[0043] <Modification example> In this embodiment, as shown in FIG. 7, since the swing-side stay 417 is fixed to the swing frame 415 by welding, in order to take out the rear sieving section 4161, the rear sieving section 4161 must be moved forward to avoid the swing-side stay 417. On the other hand, it may be configured as shown in FIG. 10. In the example of FIG. 10, the maintenance opening 71 is formed large so that the rear sieving section 4161 and the stay 4164 for fixing the rear sieving section 4161 to the swing frame 415 do not interfere with each other in the left-right direction. Further, the stay 4164 may be detachably fixed to the swing frame 415 by bolts 73. With this configuration, by simply removing the bolts 73, the rear sieving section 4161 and the swing-side stay 417 can be slid and removed along the left-right direction from the maintenance opening 71.

[0044] The butting portion between the front sieving section 4160 and the rear sieving section 4161 can be changed. For example, a downward T-shaped holding portion fixed to the swing frame 415 may be provided, and the front sieving section 4160 and the rear sieving section 4161 may be held by the holding portion. In this way, since the holding portion holds the front sieving section 4160 and the rear sieving section 4161, it is possible to pull out only the front sieving section 4160 or only the rear sieving section 4161.

[0045] In addition, in this embodiment, the second conveyor 144 (second conveying section) returns the threshed product to the front end side of the swing sorting device 41, but it is not limited to this. For example, the second conveyor 144 (second conveying section) may return it to the threshing device 3 (for example, the handling cylinder 31).

[0046] As described above, the combine of this embodiment includes a threshing device 3 for threshing crops, and a swing sorting device 41 for swing sorting the threshed product threshed by the threshing device 3. The swing sorting device 41 includes a first conveyor 143 (first conveying section) for conveying the threshed product to the grain tank 51, A second conveyor 144 (second conveying section) that returns the threshed product to the front end side of the threshing device 3 or the oscillating sorting device 41, A grain sieve 416 (first sieving section) that is located above the first conveyor 143 (first conveying section) and distributes the threshed product to the first conveyor 143 (first conveying section) or the second conveyor 144 (second conveying section), A first grain chute 431 (guiding section) that guides the threshed product that has passed through the grain sieve 416 (first sieving section) to the first conveyor 143 (first conveying section), and The rear end 416r of the grain sieve 416 (first sieving section) is located behind the rear end 431r of the first grain chute 431 (guiding section).

[0047] According to this configuration, since the material that has fallen from the rear end 416r of the grain sieve 416 (first sieving section) does not reach the first grain chute 431 (guiding section), it is possible to avoid a part of the crop that should not be conveyed to the grain tank 51 from being guided to the first conveyor 143 (first conveying section), and it becomes possible to improve the sorting performance.

[0048] In this embodiment, the oscillating sorting device 41 includes an oscillating frame 415 configured to be oscillatable back and forth, and a chaff sieve 412 disposed above the grain sieve 416 (first sieving section) and supported by the oscillating frame 415. The grain sieve 416 (first sieving section) further sorts the threshed product sorted by the oscillation of the chaff sieve 412.

[0049] The chaff sieve 412 is a sieving section for rough sorting, and the grain sieve 416 (first sieving section) is configured to precisely sort only the grains to be conveyed to the grain tank 51, making it possible to improve the sorting performance of the grain sieve 416 (first sieving section) for fine sorting.

[0050] In this embodiment, the grain sieve 416 (first sieving section) includes a front sieving section 4160 and a rear sieving section 4161 that is detachably attached to the oscillating frame 415 and is continuous with the front sieving section 4160. The rear end 416r of the rear sieving section 4161 is located behind the rear end 431r of the first grain chute 431 (guiding section).

[0051] According to this configuration, by detaching the rear sieve section 4161 according to the type of crop, appropriate sorting can be realized according to the type of crop, and sorting corresponding to multiple varieties becomes possible.

[0052] In the present embodiment, the oscillating sorting device 41 is located above the second conveyor 144 (second conveying section) and has a flat perforated rack 413 (second sieve section) that distributes the threshed material to the second conveyor 144 (second conveying section) or outside the machine. The perforated rack 413 (second sieve section) is formed with circular leakage holes 413h.

[0053] According to this configuration, the perforated rack 413 (second sieve section) does not have a horizontal bar type like a general straw rack, but has circular leakage holes 413h, which appropriately prevents straw waste such as fragments of grain straws from being distributed to the second conveyor 144 (second conveying section), and improves the sorting performance. It becomes possible to improve it.

[0054] In the embodiment shown in FIGS. 1 to 9, a maintenance opening 71 is provided so as to be accessible from outside the machine along the left-right direction with respect to the front sieve section 4160. At the butting portion of the front sieve section 4160 and the rear sieve section 4161, a rail portion 4162 that can guide the front sieve section along the left-right direction is provided. The front sieve section 4160 is configured to be detachable from the oscillating frame 415 by being inserted and removed from the maintenance opening 71 along the rail portion 4162.

[0055] In the embodiment shown in FIG. 10, a maintenance opening 71 is provided so as to be accessible from outside the machine along the left-right direction with respect to the front sieve section 4160 or the rear sieve section 4161. At the butting portion of the front sieve section 4160 and the rear sieve section 4161, a rail portion 4162 that can guide the front sieve section 4160 or the rear sieve section 4161 along the left-right direction is provided. The front sieving section 4160 or the rear sieving section 4161 is configured to be detachable from the rocking frame 415 by being inserted into and removed from the maintenance opening 71 along the rail section 4162.

[0056] According to this configuration, the front sieving section 4160 or the rear sieving section 4161 can be easily detached and attached, improving the maintainability. Also, it becomes possible to easily switch to an appropriate sieving section according to the crop.

[0057] In this embodiment, an example of a conventional combine is shown, but the present disclosure is not limited thereto, and the present disclosure may be a self - unloading combine.

[0058] The present disclosure is not limited to the above - described embodiments at all, and various improvements and modifications are possible without departing from the spirit of the present disclosure.

Explanation of Reference Numerals

[0059] 100 Combine 143 First conveyor (first conveying section) 144 Second conveyor (second conveying section) 3 Threshing device 41 Rocking sorting device 412 Chaff sieve 413 Perforated rack (second sieving section) 413h Leakage holes 415 Rocking frame 416 Grain sieve (first sieving section) 4160 Front sieving section 4161 Rear sieving section 4162 Rail section 431 First grain board (guide) 51 Grain tank 71 Maintenance opening

Claims

1. A threshing device for threshing crops, A swing sorting device for swing sorting the threshed product threshed by the threshing device, A grain tank, Comprising, The swing sorting device is, A chaff sieve for sieving the threshed product, A first sieve section disposed below the chaff sieve for further sorting the threshed product sorted by the chaff sieve, A first conveying section disposed below the first sieve section for conveying the threshed product to the grain tank, Having, The first sieve section is composed of a front sieve section and a rear sieve section, A first grain flow plate is provided for guiding the threshed product passing through the first sieve section to the first conveying section, The rear end of the rear sieve section is located behind the rear end of the first grain flow plate and in front of the rear end of the chaff sieve, and the combine is characterized in this.

2. The combine according to claim 1, characterized in that the first sieve section is composed of the front sieve section and the rear sieve section which is a separate member from the front sieve section.

3. The combine according to claim 2, characterized in that the front sieve section and the rear sieve section are connected so as to be continuous.

4. The combine according to any one of claims 1 to 3, characterized in that the first sieve section is configured to be detachable at least with respect to the swing sorting device.

5. The combine according to claim 4, characterized in that the first sieve section can be removed outside the machine through a maintenance opening provided in the machine cover.

Images