CN113841515A - Harvester and threshing device - Google Patents

Abstract

The invention relates to a harvester and a threshing device. The invention provides a harvester capable of efficiently recovering primary treatment objects from treatment objects after threshing treatment. A sorting unit in a threshing device is provided with a screen box (21A) having an upper screen (34) that allows processed objects to leak through gaps between a plurality of screen plates (34A). The screen box is provided with: a primary treated matter recovery unit (23) for recovering a primary treated matter; a secondary treatment material recovery unit (24) for recovering a secondary treatment material; and an inclined surface part (37) which extends in the front-rear direction from a position corresponding to the rear end part of the upper screen (34) to the primary processed object recovery part (23) in a front-low and rear-high state and guides the primary processed object to the primary processed object recovery part (23). The interval between the second screen plates positioned on the downstream side among the plurality of screen plates is configured to be wider than the interval between the first screen plates positioned on the upstream side of the second screen plates among the plurality of screen plates.

Description

Harvester and threshing device

Technical Field

The invention relates to a harvester and also relates to a threshing device.

Background

In relation to a first aspect of the present invention, for example, a harvester disclosed in patent document 1 includes a threshing device, and a sieve box for sorting processed objects after threshing is provided below the threshing device. The screen box is provided with an upper screen, and a primary treatment material recovery part and a secondary treatment material recovery part are respectively arranged below the screen box. The primary treated matter recovery unit recovers the treated matter leaked from the screen box as primary treated matter. The secondary processed matter collecting unit is provided downstream of the primary processed matter collecting unit in the conveying direction, and collects processed matter that has leaked from the rear portion of the screen box as secondary processed matter. The treated matter that has leaked from the upper screen is collected as a primary treated matter by a primary treated matter collecting unit.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2020 and 61971

Problems to be solved by the invention

However, when the treated matter after the threshing process is increased in size, the treated matter is likely to be accumulated on the sieve box and become lumps. Therefore, if the processed object is conveyed in a state of being stacked on the upper screen, it is considered that the processed object that should originally leak downward from the upper screen does not leak downward, and a large amount of the processed object leaks downward from the rear portion of the screen box. The processed matter that does not leak downward from the upper screen is not collected in the primary processed matter collecting unit, and the processed matter that leaks downward from the rear portion of the screen box is often collected in the secondary processed matter collecting unit. In general, the amount of the secondary processed matter that can be collected by the secondary processed matter collecting unit is smaller than the amount of the primary processed matter that can be collected by the primary processed matter collecting unit, and therefore, if a large amount of the processed matter leaks from the rear portion of the screen box, the secondary processed matter collecting unit may overflow the processed matter. Further, if the processed matter that should be recovered by the primary processed matter recovery unit is recovered by the secondary processed matter recovery unit, the processed matter is returned to the screen box again and is deposited on the upper screen or the like as the object to be sorted, and therefore, the sorting efficiency is deteriorated.

As for the second aspect of the present invention, conventionally, as a threshing device, for example, a threshing device described in patent document 2 is known. The threshing device described in patent document 2 includes: a threshing part for threshing the input crops; a sorting unit disposed below the threshing unit for sorting the threshed objects from the threshing unit; and left and right threshing side wall parts located on the left and right sides of the threshing part and the sorting part. The sorting unit is provided with a screen box for swinging sorting while conveying the threshed objects backward by swinging drive. A side cover for covering the space between the lateral side part of the screen box and the threshing side wall part is arranged at the outer side part of the screen box in the left-right direction. In order to prevent the threshed objects which are placed on the side covers and roll backwards from leaking out of the rear end parts of the screen boxes, the rear end parts of the left and right side covers are bent inwards in the left and right directions.

Documents of the prior art

Patent document

Patent document 2: japanese patent laid-open No. 2020 and 43778

Problems to be solved by the invention

However, in the threshing device described in patent document 2, the portions of the left and right side covers that are bent inward in the left-right direction are rear end portions of the left and right sieve boxes. Therefore, the threshed object moving backward between the lateral side portion and the threshing side wall portion of the screen box may leak to the outside from the rear end portion of the screen box without falling into the screen box.

Disclosure of Invention

A first aspect of the present invention is to provide a harvester capable of efficiently recovering a primary processed material from a processed material after threshing.

Means for solving the problems

In a first aspect of the present invention, there is provided a harvester including a threshing device having a threshing section that threshes a crop and a sorting section that sorts the threshed processed material while conveying it rearward, the sorting section including a screen box having an upper screen that allows the processed material to leak through gaps between a plurality of screen plates arranged in a conveying direction of the processed material, the harvester including, below the screen box: a primary treated matter recovery unit that recovers the treated matter leaked from the screen box as a primary treated matter; a secondary processed matter recovery portion that is provided downstream of the primary processed matter recovery portion in the conveying direction and that recovers the processed matter that leaks from the rear portion of the screen box as a secondary processed matter; and a slope portion extending in a front-rear direction from a position corresponding to a rear end portion of the upper screen toward the primary processed object collecting portion in a front-lower and rear-higher state, and guiding the primary processed object to the primary processed object collecting portion, wherein a gap between second screen plates located on a downstream side among the plurality of screen plates is configured to be wider than a gap between first screen plates located on an upstream side than the second screen plates among the plurality of screen plates.

According to the present invention, the screen deck in the upper screen is divided into the first screen deck and the second screen deck on the downstream side of the first screen deck. Further, since the second screen plates are spaced wider than the first screen plates, the processed material is likely to leak from the gaps between the second screen plates. Therefore, even when the processed object after the threshing process is large and the processed object is deposited on the sieve plate, it is possible to make the processed object leak through the second sieve plate as much as possible. In other words, even if the processed object is deposited on the screen plates, if the processed object that should originally leak downward on the screen plates does not leak downward on the first screen plate, the possibility of leaking downward on the second screen plate becomes high. The second screen plate is located on the downstream side of the plurality of screen plates, and the slant portion extends from a position corresponding to the rear end portion of the upper screen toward the primary processed object collecting portion in a front-low and rear-high state. In this case, compared to a configuration in which the interval between the second screen decks is the same as the interval between the first screen decks, most of the processed material to be collected by the primary processed material collection unit is efficiently collected by the primary processed material collection unit, and the possibility of the processed material overflowing from the secondary processed material collection unit can be reduced. Further, according to the configuration of the present invention, since the possibility that the processed material which should be recovered by the primary processed material recovery unit is recovered by the secondary processed material recovery unit can be reduced, the amount of the processed material which is returned from the secondary processed material recovery unit to the screen box is reduced, and the sorting efficiency is improved. Thus, a harvester capable of efficiently recovering a primary processed material from a processed material after threshing can be realized.

In the present invention, it is preferable that each of the plurality of screen plates is configured to be rotatable about a horizontal axis to change an opening degree of the gap and to be rotatable in synchronization with the whole screen plate.

In this configuration, the plurality of screen plates including the first screen plate and the second screen plate rotate integrally and simultaneously. Therefore, even if the opening degree of the gap is changed, the structure of "the interval between the second screen plates is wider than the interval between the first screen plates" is maintained. Thus, the processed object to be collected by the primary processed object collecting unit is efficiently collected by the primary processed object collecting unit, as compared with a configuration in which the plurality of sieve plates are rotated in synchronization with each other as a whole.

In the present invention, it is preferable that the plurality of screen plates are linked to each other by a link mechanism.

According to this structure, a structure in which the plurality of screen plates integrally rotate in synchronization can be easily realized.

In the present invention, it is preferable that the sieve box includes: a first vibrating plate which is provided at a conveyance start end portion and which conveys the processed object rearward; and a second vibrating plate that is provided above the upper screen and on a downstream side of the first vibrating plate in the conveying direction, and that conveys the processed object rearward, wherein the plurality of second screen plates overlap the second vibrating plate in the conveying direction.

In this configuration, the second screen plate and the second vibrating plate are overlapped with each other in the conveying direction, and therefore, among the processed objects supplied from the second vibrating plate to the upper screen, the processed object to be collected by the primary processed object collecting unit actively leaks downward from the second screen plate.

In the present invention, it is preferable that the second screen decks are respectively provided on a downstream side of a region directly above the primary processed object collecting unit in the conveying direction.

The primary treated matter to be recovered by the primary treated matter recovery unit has a high specific gravity among the treated matters. Therefore, in the conveyance starting end region in the upper screen, the primary processed matter is likely to be concentrated on the lower side in the processed matter, and the primary processed matter actively leaks down from the gaps between the respective screen plates. On the other hand, the closer to the conveyance terminal side in the upper screen, the smaller the proportion of the primary processed object in the processed objects. In this case, in the conveyance end region of the upper screen, for example, the primary processed object is buried in the cut straw, and the primary processed object is less likely to leak through the gaps between the screen plates. In this configuration, the gap between the second screen plates is formed to be wider than the gap between the first screen plates at a position downstream of the region directly above the primary processed object collecting unit in the conveying direction. Therefore, the processed material can be actively leaked from the gaps between the second screen plates, and the possibility that the primary processed material buried in the cut straws, for example, is collected by the primary processed material collecting unit is increased.

In view of the above-described problems, a second aspect of the present invention is directed to a threshing device capable of preventing threshed objects located between lateral side portions and a threshing side wall portion of a screen box from leaking to the outside from a rear end portion of the screen box.

Means for solving the problems

A threshing device according to a second aspect of the present invention includes: a threshing unit that threshes the input crop; a sorting unit disposed below the threshing unit and configured to sort the threshing processed object obtained from the threshing unit; and left and right threshing side wall portions located on left and right sides of the threshing portion and the sorting portion, the sorting portion including a sieve box that performs swing sorting while transferring a threshing processed object backward by swing driving, the sieve box including a guide portion above a lateral side portion thereof, the guide portion guiding the threshing processed object located between the lateral side portion and the threshing side wall portion toward a left and right center portion side of the sieve box.

According to this configuration, the threshed object moving rearward between the lateral side portion and the threshing side wall portion of the screen box is guided by the guide portion toward the center portion side in the left-right direction of the screen box, and falls into the screen box. As a result, the threshed objects located between the lateral side portions and the threshing side wall portions of the screen box can be prevented from leaking to the outside from the rear end portion of the screen box.

In the present invention, it is preferable that the threshing unit includes a threshing cylinder that threshes the crop by rotational driving and a receiving net provided on an outer periphery of a lower portion of the threshing cylinder, and the guide unit is provided on a rear side of a rear end portion of the receiving net in a front-rear direction.

According to this configuration, even if the threshing object that has leaked from the receiving net does not fall into the sieve box but moves rearward between the lateral side portions and the threshing side wall portions of the sieve box, the threshing object is guided by the guide portion toward the center portion side in the left-right direction of the sieve box and falls into the sieve box. Therefore, the threshed objects leaking from the receiving net can be prevented from leaking to the outside from the rear end of the screen box.

In the present invention, it is preferable that the threshing cylinder extends to a position rearward of a rear end portion of the receiving net, and the guide portion is provided rearward of a terminal end portion of the threshing cylinder in a front-rear direction.

According to this configuration, even if the threshing object threshed by the threshing cylinder does not fall into the sieve box but moves rearward between the lateral side portions and the threshing side wall portions of the sieve box, the threshing object is guided by the guide portion toward the center portion side in the left-right direction of the sieve box and falls into the sieve box. Therefore, the threshed objects threshed by the threshing cylinder can be prevented from leaking to the outside from the rear end of the screen box.

In the present invention, it is preferable that a separation drum for separating straw chips and grains while diffusing a threshing object is provided above the sieve box behind the threshing cylinder, and the guide portion is provided at a position rearward of the separation drum in the front-rear direction.

According to this configuration, even if the grains separated from the straw chips by the separation drum do not fall into the sieve box but move rearward between the lateral side portions and the threshing side wall portions of the sieve box, the grains are guided by the guide portion toward the center portion side in the left-right direction of the sieve box and fall into the sieve box. Therefore, the grains separated from the straw chips by the separating drum can be prevented from leaking to the rear of the screen box.

In the present invention, it is preferable that the threshing device includes a dust discharge port for discharging the straw conveyed by the sieve box to the outside of the device, a baffle portion for adjusting an opening degree of the dust discharge port by swinging is provided above a rear end portion of the sieve box, and the guide portion is provided at a position on a front side of the baffle portion in a state where the opening degree of the dust discharge port is minimized in a front-rear direction.

According to this configuration, the guide portion can be prevented from interfering with the shutter portion in a state in which the opening degree of the dust discharge port is minimized.

In the present invention, it is preferable that the sieve box includes, below the sieve box: a spiral primary processed object recovery part for recovering the sorted primary processed objects; and a spiral secondary processed object recovery unit that is provided at a position on the rear side of the primary processed object recovery unit and recovers the sorted secondary processed object, wherein the spiral secondary processed object recovery unit includes inclined portions having a downward narrowing shape that sets the secondary processed object recovery unit to the lowermost end in a side view, in front of and behind the secondary processed object recovery unit, and the guide portion is provided at a position within an existing range of the inclined portions in the front-rear direction.

According to this configuration, the threshed processed matter located between the lateral side portion and the threshing side wall portion of the sieve box is guided by the guide portion toward the center portion side in the left-right direction of the sieve box, and falls from the inside of the sieve box to the secondary processed matter collecting portion. Therefore, the threshed processed matter located between the lateral side portion and the threshing side wall portion of the screen box can be collected in the secondary processed matter collecting portion.

In the present invention, it is preferable that the threshing device includes a gap filling member having flexibility for filling a gap between an upper end portion of the lateral side portion and the threshing side wall portion, and the guide portion is provided on the gap filling member.

According to this configuration, the gap-filling member can prevent the threshed objects from leaking through the gap between the upper end portion of the lateral side portion of the screen box and the threshing side wall portion. The guide portion can guide the threshed object on the gap burying member toward the center portion side in the left-right direction of the screen box, and the threshed object can be dropped into the screen box.

In the present invention, it is preferable that the guide portion includes an extension portion that extends toward a center portion side in a left-right direction of the screen box with respect to the lateral side portions and extends downward with respect to upper end portions of the lateral side portions.

According to this configuration, the threshed processed material moving rearward between the lateral side portions and the threshing side wall portions of the screen box is guided by the extension portion toward the center portion side in the left-right direction of the screen box with respect to the lateral side portions, and is guided toward the lower side with respect to the upper end portions of the lateral side portions. This makes it possible to reliably guide the threshed objects moving rearward between the lateral side portions and the threshing side wall portions of the screen box toward the center portion side in the left-right direction of the screen box, and reliably drop the threshed objects into the screen box.

In the present invention, it is preferable that the guide portion is provided at a plurality of positions in the front-rear direction.

According to this configuration, since the plurality of guide portions are provided on the movement path of the threshing processed object moving rearward between the lateral side portions and the threshing side wall portions of the sieve box, the threshing processed object can be reliably guided toward the center portion side in the left-right direction of the sieve box.

In the present invention, it is preferable that the guide surface of the guide portion is formed in an inclined shape that is positioned more rearward toward a center portion in the left-right direction of the screen box.

According to this configuration, the threshed object moving rearward between the lateral side portions and the threshing side wall portions of the screen box can be guided toward the center portion side in the left-right direction of the screen box without obstructing the flow.

Drawings

First embodiment

Fig. 1 is an overall side view of a combine harvester.

Fig. 2 is a schematic view of a threshing device.

Fig. 3 is a longitudinal sectional view showing the swing sorting apparatus.

Fig. 4 is a graph showing the width of the space between the screen decks in each position of the screen decks.

Fig. 5 is a front view showing a rotating body, a cover, and an opening provided in a front wall of the threshing device.

Fig. 6 is a cross-sectional view VI-VI of fig. 5 showing the rotating body, the cover, and the opening provided in the front wall of the threshing device.

Fig. 7 is a VII-VII cross-sectional view of fig. 5 showing the rotating body, the cover, and the opening provided on the front wall of the threshing device.

Fig. 8 is a graph showing another embodiment of the width of the space between the screen decks per each position of the screen decks.

Second embodiment

Fig. 9 is a left side view showing the half-feed combine.

Fig. 10 is a left side sectional view showing the threshing device.

Fig. 11 is a plan view showing the structure of the screen box.

Fig. 12 is a front sectional view showing the structure of the screen box.

Fig. 13 is a front sectional view showing the structure of a sieve box of another embodiment.

Description of the reference numerals

First embodiment

6: threshing device

10: threshing part

11: sorting section

21A: screen box

23: first processed material recovery part

24: recovery part of secondary processed material

32: first vibrating plate

33: second vibrating plate

34: an upper sieve 34A: screen decks (first screen deck, second screen deck) 34B: connecting rod (connecting rod mechanism)

37: inclined plane part

L1: area of the first screen deck

L2: area of the second screen deck

d 1: gaps between the first screen plates

d 2: gaps between the second screen plates

Second embodiment

9: threshing device

20: threshing part

21: sorting section

23: threshing side wall part

25: threshing cylinder

26: receiving net

30: screen box

30 a: lateral side part

43: separating drum

45: first processed material recovery part

46: recovery part of secondary processed material

48: second inclined part (inclined part)

52: dust exhaust port

53: baffle part

54: gap filling member

56: guide part

56 a: guide surface

57: extension setting part

Detailed Description

First embodiment

Hereinafter, an embodiment as an example of the present invention will be described based on a combine harvester as an example of a harvester. In the following description, the travel machine body 1 of the combine harvester is defined as "machine body front" in the direction of arrow "F" shown in fig. 1 and 2 and "machine body rear" in the direction of arrow "B". In fig. 1 and 2, the direction on the near side of the paper is referred to as the "left side of the machine body", and the direction on the far side of the paper is referred to as the "right side of the machine body". The direction of arrow "L" shown in fig. 4 is referred to as "left side of the machine body", and the direction of arrow "R" is referred to as "right side of the machine body".

[ concerning the entirety of the combine ]

As shown in fig. 1, a travel machine body 1 of a combine harvester includes a frame 2, and the frame 2 is formed by connecting a plurality of steel members such as square pipes. A pair of left and right crawler type traveling devices 3 is provided at a lower portion of the frame 2. A driver section 5 is provided on a right lateral side portion of the front portion of the traveling machine body 1. The boarding space of the cab 5 is covered by a cab. An engine E is disposed below the driver unit 5. A harvesting unit 4 is provided at the front of the travel machine body 1 so as to be able to move up and down. The harvesting part 4 harvests upright grain stalks (crops) of rice and wheat of a plurality of planting strips while lifting up the upright grain stalks in front of the traveling machine body 1, and conveys the harvested grain stalks toward the rear of the machine body. A threshing device 6 and a grain storage box 8 are supported in a horizontal arrangement at the rear of the frame 2. The threshing device 6 is disposed behind the harvesting part 4, and the grain storage box 8 is disposed behind the driving part 5. A supply chain 7 is provided at the left side of the threshing device 6, and the supply chain 7 holds and conveys the harvested grain stalks harvested by the harvesting unit 4 rearward. The threshing device 6 performs a threshing process of the input harvested grain stalks, and performs a sorting process of sorting the grains and dust obtained by the threshing process. The grain storage box 8 stores grains fed from the threshing device 6. A grain discharging device 9 for taking out grains from the grain storage box 8 is connected to the rear part of the grain storage box 8.

[ threshing device ]

Fig. 2 shows a threshing device 6. The threshing device 6 includes a threshing unit 10 and a sorting unit 11. The threshing section 10 threshes the crop, and the sorting section 11 sorts the threshed processed crop while conveying it backward. The threshing unit 10 includes a threshing cylinder 12, a receiving net 14, a separation drum 15, and a dust exhaust fan 16. The threshing unit 10 is provided with a threshing chamber 13, and the threshing chamber 13 accommodates a threshing cylinder 12. The threshing cylinder 12 is provided in the threshing chamber 13 in a state of extending in the front-rear direction of the machine body, and the threshing cylinder 12 can rotate around a rotation axis Y1 extending in the front-rear direction of the machine body.

The threshing cylinder 12 includes a threshing cylinder 17, a plurality of threshing teeth 18, and a support shaft 19. The support shaft 19 has a longitudinal direction along the rotating shaft core Y1, and the threshing cylinder 17 rotates integrally with the support shaft 19. Threshing teeth 18 are mounted to the circumferential surface of the threshing cylinder 17. The front end of the support shaft 19 of the threshing cylinder 12 penetrates the front wall 41 of the threshing device 6. The support shaft 19 includes a rotating body 43 for inputting power to the threshing cylinder 12, at a portion thereof that protrudes outward from the threshing device 6 with respect to the front wall portion 41. The rotating body 43 is a pulley.

A belt 44 (see fig. 5 to 8) for transmission is wound around the rotating body 43 and an output pulley (not shown), and the power from the engine E is input to the rotating body 43 via the output pulley. The rotating body 43 and the belt 44 are "driving portions" in the present invention. That is, the belt 44 for transmission and the rotating body 43 around which the belt 44 is wound constitute a "driving portion" in the present invention.

A threshing opening for the reaped grain stalks to pass through is formed at the left side part of the threshing device 6. An inlet portion 42 (see fig. 5 and 6) that enters the threshing chamber 13 is formed in a region below a portion of the front wall portion 41 of the threshing device 6 that is covered with the cover portion 45. The harvested straw harvested by the harvesting unit 4 and fed backward by the feeding chain 7 is fed from the inlet 42 into the threshing chamber 13. The supply chain 7 conveys the harvested straw from the harvesting unit 4 in a state where the tip of the harvested straw is thrown into the threshing chamber 13.

The threshing cylinder 12 is rotationally driven in conjunction with the rotational drive of the rotating body 43 to perform threshing processing on the harvested grain stalks. The harvested straws fed backward by the feeding chain 7 are subjected to beating and combing action by the rotation of the threshing cylinder 12 in the threshing chamber 13, and are threshed. A receiving net 14 is arranged below the threshing cylinder 12. A separation roller 15 is arranged behind the threshing cylinder 12. The separation drum 15 is a diffuser that spreads the objects to be sorted and promotes the flow-down of the singulated grains and the like contained therein. A dust exhaust fan 16 for exhausting dust to the outside is provided behind the separation drum 15.

A cover 45 is attached to the front wall 41 of the threshing device 6 so as to cover the rotating body 43 and the belt 44. In addition, an elastically deformable sheet member 49 is provided to cover the inlet portion 42. The sheet member 49 is, for example, a flexible rubber member, and is fixed to the lower portion of the cover portion 45 by bolts. The sheet member 49 hangs down from the lower portion of the cover portion 45 and covers the inlet portion 42 from the front. The upper end of the sheet member 49 is pressed by the pressing member 47 and fixed to the lower portion of the cover 45.

The sorting unit 11 is provided below the threshing unit 10, i.e., below the threshing device 6. The sorting unit 11 includes: the swing sorting device 21, the main air separator 22A, the first sub air separator 22B, the second sub air separator 22C, the primary processed object collecting unit 23, the secondary processed object collecting unit 24, and the inclined surface unit 37. The swing sorting device 21 has a screen box 21A formed in a rectangular frame shape in a plan view, and performs swing sorting of objects to be sorted by the swing of the screen box 21A. The main air separator 22A blows the separation air to a lower separation region (fine separation region) in the swing separation device 21. The first sub air separator 22B blows the separation air to the upper separation region (rough separation region) in the swing separation device 21. The second sub-air separator 22C blows the separation air to the rear separation region in the swing separation device 21.

The primary processed material recovery portion 23 and the secondary processed material recovery portion 24 are provided below the sieve box 21A. The primary processed matter collecting unit 23 collects the processed matter leaked from the screen box 21A as grains (e.g., singulated grains) of the primary processed matter. The secondary processed material collecting unit 24 is provided behind the primary processed material collecting unit 23, and collects processed materials that have leaked from the rear portion of the screen box 21A as grains (branched grains, etc.) of secondary processed materials. The primary processed material collecting unit 23 is provided with a primary screw 25, and grains of the primary processed material are conveyed to the right by the primary screw 25. A vertical grain feeder 26 is linked to the right end of the primary screw 25, and the vertical grain feeder 26 feeds grains of the primary processed product vertically to the grain bin 8. The secondary processed material collecting unit 24 is provided with a secondary screw 27, and the secondary screw 27 conveys grains of the secondary processed material to the right. A secondary reduction device 28 is connected to the right end of the secondary screw device 27 in an interlocking manner, and the secondary reduction device 28 reduces the grains of the secondary processed product to the screen box 21A.

The swing sorting device 21 includes a first vibrating plate 32, a second vibrating plate 33, an upper screen 34, a lower screen 35, and a document sorter 36. The first vibrating plate 32, the second vibrating plate 33, the upper screen 34, the lower screen 35, and the document jogger 36 are supported by the screen box 21A. An eccentric cam type drive mechanism 31 is provided at the rear of the screen box 21A, and when the drive mechanism 31 is driven, the entire screen box 21A swings.

The first vibrating plate 32 is provided at the conveyance starting end portion of the screen box 21A, and performs specific gravity sorting while conveying the processed object rearward. The second vibrating plate 33 is provided behind the first vibrating plate 32, and performs specific gravity sorting while conveying the processed object leaked from the rear of the receiving net 14 rearward.

The second vibrating plate 33 is provided on the side of the first vibrating plate 32 where the secondary reducing device 28 is located, and most of the grains of the secondary processed product discharged from the secondary reducing device 28 are received by the second vibrating plate 33 and subjected to specific gravity separation by the second vibrating plate 33. The upper screen 34 is disposed below the first vibrating plate 32 and the second vibrating plate 33. The lower screen 35 is disposed below the upper screen 34.

A screen line 33a is attached to the rear of the second vibration plate 33. The screen lines 33a extend rearward from the rear portion of the second vibrating plate 33 and are provided at intervals in the right-left direction of the machine body. A rear portion of the upper screen 34 and a document sorter 36 are disposed below the screen line 33 a. The screen line 33a allows the processed object to leak downward while scattering the processed object from the second vibrating plate 33.

As shown in fig. 3, a weld bolt 21B is fixed to an edge portion of the screen box 21A below the upper screen 34, and the lower screen 35 is engaged with the weld bolt 21B from below and fixed by a nut 21N. That is, the lower screen 35 is fastened and fixed to the lower edge portion of the screen box 21A.

As shown in fig. 2 and 3, the inclined surface portion 37 is provided below the screen box 21A and is connected to a portion of the screen box 21A that is located rearward in the front-rear direction relative to the rear end portion of the lower screen 35. The inclined surface portion 37 is formed in a shape inclined toward the primary processed object collecting portion 23. In other words, the inclined surface portion 37 extends in the front-rear direction from a position corresponding to the rear end portion of the upper screen 34 toward the primary processed object collecting portion 23 in a front-lower and rear-higher state. The extending end of the slope 37 is located in the region of the primary processed object collecting unit 23. Among the processed objects that have leaked from the upper screen 34, the processed objects that have leaked downward from the lower screen 35 fall down toward the primary processed object collecting unit 23 or the inclined surface portion 37. The processed material falling down to the primary processed material collecting unit 23 or the slope portion 37 is collected as grains of the primary processed material by the primary processed material collecting unit 23.

The document sorter 36 is disposed behind the upper screen 34. Of the processed objects conveyed to the document jogger 36, grains, which are processed objects leaked from the document jogger 36 as secondary processed objects, are collected by the secondary processed object collecting unit 24.

[ Structure of the upper screen ]

As shown in fig. 3, the upper screen 34 is configured to be adjustable in opening degree. The upper screen 34 includes a plurality of screen plates 34A, and the screen plates 34A extend to the left and right of the screen box 21A. The plurality of screen plates 34A are arranged at predetermined intervals in the front-rear direction (conveying direction), and the processed object can be dropped through the gaps d1 and d2 between the screen plates 34A. The respective long side directions of the screen plates 34A are transverse to the machine body. The screen plates 34A are respectively configured to be rotatable about a horizontal axis in the transverse direction of the machine body, and are linked to each other by a link lever 34B (link mechanism). Therefore, the plurality of screen plates 34A rotate integrally in synchronization. The opening degree of the gaps d1 and d2 between the sieve plates 34A can be changed by the turning mechanism of the sieve plates 34A. The screen plates 34A are inclined so as to have the same rotation angle. The sieve plates 34A are always parallel regardless of the rotation angle.

In the present embodiment, the gaps d1, d2 between the screen decks 34A are separation distances between the lower surface portions (rear surface portions) of the front screen decks 34A and the upper surface portions (rear surface portions) of the rear screen decks 34A in the front and rear adjacent screen decks 34A. Although each screen deck 34A has a wall thickness, the gaps d1, d2 between the screen decks 34A are separation distances other than the respective thick wall portions of the screen decks 34A.

In the present embodiment, the gap between the screen plates 34A is set in two stages in the front and rear, and as shown in fig. 3 and 4, the gap d1 is set in the front portion L1, and the gap d2 is set in the rear portion L2. The gaps d1 and d2 shown in fig. 3 and 4 are shown as gaps at an arbitrary rotation angle of the screen plate 34A. Since the gaps d1, d2 are proportional to the rotation angle of the screen deck 34A, the ratio of (d1/d2) is always constant for each screen deck 34A regardless of the rotation angle.

The screen plates 34A are arranged such that the intervals between the screen plates 34A positioned in the rear portion L2 in the upper screen 34 are wider than the intervals between the screen plates 34A positioned in the front portion L1. The gap d2 between the sieve plates 34A located in the rear portion L2 is configured to be wider than the gap d1 between the sieve plates 34A located in the front portion L1. In the present embodiment, the screen decks 34A located in the front portion L1 are referred to as "first screen decks", respectively. In the present embodiment, the screen decks 34A located in the rear portion L2 are each referred to as "second screen decks". The screen plates 34A located in the rear portion L2 are respectively provided in the upper screen 34 at positions rearward of the region directly above the primary processed matter collecting portion 23. In fig. 3, a portion where the rear end portion of the net 14 is received in the front-rear direction is indicated by 14F, and the screen plates 34A located in the rear portion L2 are located behind the portion indicated by 14F.

A second vibrating plate 33 is disposed above the upper screen 34. The second vibration plate 33 overlaps with a boundary area of the front portion L1 and the rear portion L2 in the front-rear direction (conveying direction). The plurality of screen plates 34A located in the rear portion L2 overlap with the second vibration plate 33 in the conveying direction. The area where the second vibration plate 33 is located in the conveying direction is indicated by an area L3 in fig. 3. The area L3 where the second vibrating plate 33 is located overlaps with the area of the rear portion L2 where the second screen deck is located in the conveying direction. In addition, directly below the screen line 33a, there is an area of the rear portion L2 where the second screen deck is located.

[ cover section for cover tape ]

As described above with reference to fig. 2, the support shaft 19 protrudes forward from the front wall 41 of the threshing device 6, and the rotating body 43 is provided at the front end of the support shaft 19. A cover 45 that covers the rotating body 43 and the belt 44 is attached to the front wall 41 of the threshing device 6.

As shown in fig. 5 and 6, two stays 51 and 51 for supporting the upper portion of cover 45 protrude from front wall 41 toward the front side of the body, and support frame 52 spans across the two stays 51 and 51. The engaging portion 53 that engages with the buckle 45B of the cover portion 45 is provided so as to protrude from the right end of the front wall portion 41 toward the front side of the body.

The cover portion 45 includes a pair of cover hooks 45H, 45H for engaging with the support frame 52. A pair of flat plate- like stays 45S, 45S are welded and fixed to left and right portions of an upper end portion of the cover 45. Cover hooks 45H and 45H are welded and fixed to the pair of stays 45S and 45S, respectively.

A pair of engaging holes are formed at both left and right end portions of the support frame 52, and the pair of engaging holes face the pair of cover hooks 45H, 45H. The pair of cover hooks 45H and 45H are engaged with the pair of engagement holes, and the pair of cover hooks 45H and 45H are thereby engaged with the support frame 52.

The worker releases the engagement of the buckle 45B with the engagement portion 53, swings the cover 45 toward the front side of the machine body, and thereafter slides the cover 45 upward, thereby disengaging the cover hook 45H from the support frame 52. This allows the operator to detach cover 45 from the body. The operator slides the cover 45 downward with respect to the support frame 52 to hook the cover hooks 45H and 45H to the pair of engagement holes of the support frame 52. Thereafter, the operator swings the cover 45 toward the rear side of the machine body, and engages the buckle 45B with the engagement portion 53. This enables the operator to attach cover 45 to the machine body.

The front end of the cover portion 45 is formed in a vertically extending flat shape, and this portion is referred to as a vertical surface portion 45a of the cover portion 45. A left inclined surface 45c and a right inclined surface 45d are formed at the lower portion of the cover 45. The left inclined surface 45c and the right inclined surface 45d are inclined so as to be located more rearward than the lower side of the machine body when viewed from the side of the machine body. The left inclined surface portion 45c is formed in a left-raised shape so as to be located further upward toward the left side of the machine body (right side in the paper plane of fig. 5) as viewed in the machine body front-rear direction. The right inclined surface portion 45d is formed in a right-rising shape so as to be located on the upper side as viewed in the front-rear direction of the machine body, the right side (left side in the paper surface of fig. 5) of the machine body is closer to the right side. The left inclined surface portion 45c is inclined upward relative to the right inclined surface portion 45 d. In this way, the cover portion 45 is formed in a downwardly tapered shape so as to have a narrower width toward the lower side in the transverse direction of the machine body.

A plate-shaped lower wall portion 48 is provided across the left and right inclined surface portions 45c and 45d and the front wall portion 41. The lower wall portion 48 is formed in a V-shape along the inclination of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-rear direction.

[ opening part of cover part ]

As shown in fig. 5 to 7, an opening 60 is formed in a lower portion of the cover 45 formed in a downwardly narrowed shape. A region of the left inclined surface portion 45c indicated by a range L11 from the lower end portion to the left side of the body and a region of the right inclined surface portion 45d indicated by a range L12 from the lower end portion to the right side of the body are recessed forward and upward of the body, and this recessed portion is an opening portion 60. Further, the region indicated by L11 and L12 in the lower wall portion 48, that is, the lower region of the rotating body 43 is recessed rearward of the machine body, and this recessed portion is the opening 60. That is, the opening portion 60 is formed by the concave portions of the left and right inclined surface portions 45c and 45d and the concave portion of the lower wall portion 48. The opening 60 allows foreign matter that has entered the space between the front wall 41 and the cover 45 to fall.

As described above, the cover 45 is formed in a downwardly tapered shape so as to have a narrower width toward the lower side, and the opening 60 is formed to include the lower end portion of the cover 45. The opening 60 is formed in a central region in the width direction of the threshing device 6 in the lower portion of the cover 45. In addition, opening 60 is formed in a portion of the lower portion of cover 45 that is located below the range in which rotor 43 is present.

As shown in fig. 5, the opening 60 overlaps with the lower portion of the rotating body 43 when viewed in the front-rear direction. The opening 60 overlaps the rotary body 43 with a width larger than half the lateral width of the rotary body 43 in the transverse direction of the machine body. The opening 60 is formed in a portion of the lower portion of the cover 45 close to the belt 44. By forming the opening 60 below the rotating body 43, dust and the like do not accumulate in the lower region of the rotating body 43.

As shown in fig. 5 to 7, the opening 60 is provided with a lattice-shaped regulating member 46. The restriction member 46 restricts entry of foreign matter from the opening 60 into the space between the front wall portion 41 and the cover 45. A pressing member 47 is fixed with a bolt directly above the opening 60. The pressing member 47 is formed in a V shape along the inclination of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-rear direction. A welding bolt 47B is attached to the pressing member 47. A plurality of insertion holes are formed in the lower edge portion of the vertical surface portion 45a, and a plurality of insertion holes are formed in the lower edge portion of the vertical surface portion 45a at positions corresponding to the welding bolts 47B.

As shown in fig. 7, the regulating member 46 includes a base portion 46A and a body portion 46B. The base portion 46A is formed in a V shape along the inclination of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-rear direction, similarly to the pressing member 47. The base portion 46A is supported by a lower edge portion of the vertical surface portion 45a, and the body portion 46B is positioned at the opening 60. The base portion 46A and the body portion 46B are welded and fixed to each other, and the body portion 46B extends downward from the base portion 46A. The body 46B is formed in an L shape when viewed from the side of the body, and an extending end of the body 46B extends rearward of the body. The extending end of the body 46B abuts against the lower wall 48, and in this state, the extending end of the body 46B is positioned below the lower wall 48.

The sheet member 49, the base 46A, and the pressing member 47 are fastened and fixed to the lower portion of the cover 45 by a weld bolt 47B and a nut Nu. The weld bolt 47B and the nut Nu are "fasteners" of the present invention.

A plurality of insertion holes are formed in the upper edge portion of the sheet member 49, similarly to the plurality of insertion holes formed in the lower edge portion of the vertical surface portion 45 a. The plurality of insertion holes of the sheet member 49 are opened at positions corresponding to the welding bolts 47B and the plurality of insertion holes opened at the lower edge portion of the vertical surface portion 45 a. Further, the base portion 46A is opened with a plurality of insertion holes. The insertion holes of the base portion 46A are formed at positions corresponding to the welding bolts 47B and a plurality of insertion holes formed in the lower edge portion of the vertical surface portion 45 a.

The welding bolt 47B of the pressing member 47 is inserted through the plurality of insertion holes of the sheet member 49, the plurality of insertion holes of the lower edge portion of the vertical surface portion 45a, and the insertion holes of the base portion 46A in a state of being overlapped in the front-rear direction. Thereafter, the welding bolt 47B is fastened with the nut Nu. In this state, the base portion 46A of the regulating member 46 is sandwiched between the lower portion of the vertical surface portion 45a and the nut Nu of the welding bolt 47B fastened to the pressing member 47. The sheet member 49 is sandwiched between the pressing member 47 and the lower portion of the vertical surface portion 45 a. The sheet member 49 is positioned in front of the regulating member 46.

In a state where the base portion 46A is fastened and fixed to the vertical surface portion 45a, the body portion 46B covers the opening portion 60 over the entire surface. Since the main body 46B is formed in a lattice shape, the opening 60 is divided into a plurality of openings 60a by the main body 46B of the regulating member 46. This reduces one opening 60a of the opening 60, which is a gap formed in the body portion 46B, and makes it difficult for crops to enter the internal space of the cover portion 45 through the opening 60.

[ other embodiments ]

The present invention is not limited to the configurations exemplified in the above embodiments, and other representative embodiments of the present invention are exemplified below.

(1) In the above embodiment, the gap between the screen plates 34A is set to the gap d1 in the front portion L1 and to the gap d2 in the rear portion L2, but the present invention is not limited to this embodiment. For example, the gap between the screen plates 34A may be set to three stages or more in the front and rear. As shown in fig. 8, the gap between the screen plates 34A may be configured to be stepless, and for example, the following structure may be adopted: in the rear portion L2, the more downstream the screen plates 34A are located, the wider the gap between the screen plates 34A is. Further, the following structure is also possible: similarly, in the front portion L1, the more downstream the screen plates 34A are located, the wider the gap between the screen plates 34A.

(2) In the above embodiment, the sieve plate 34A is configured to rotate in synchronization with the whole, but the sieve plate 34A may not be rotated in synchronization with the whole. For example, the following structure is also possible: the first sieve plate rotates integrally and synchronously, and the second sieve plate rotates integrally and synchronously, and the first sieve plate and the second sieve plate rotate respectively.

(3) In the above embodiment, the plurality of screen plates 34A located in the rear portion L2 overlap with the second vibrating plate 33 in the conveying direction, but the present invention is not limited to this embodiment. The following structure is also possible: the plurality of screen plates 34A located in the rear portion L2 do not overlap with the second vibration plate 33 in the conveying direction. The second diaphragm 33 may not be provided.

(4) In the above embodiment, the plurality of screen decks 34A located closer to the rear portion L2 are provided respectively at positions downstream of the region immediately above the primary processed matter collecting portion 23 in the conveying direction, but the present invention is not limited to this embodiment. For example, the following structure is also possible: the plurality of screen plates 34A located in the rear portion L2 are provided from a region directly above the primary processed matter collecting portion 23 to the conveying terminal end portion of the upper screen 34 in the conveying direction, respectively.

(5) In fig. 3, the number of the screen decks 34A located in the front portion L1 is 22, and the number of the screen decks 34A located in the rear portion L2 is 8, but the present invention is not limited thereto. The number of the screen decks 34A positioned in the front portion L1 and the number of the screen decks 34A positioned in the rear portion L2 may be changed as appropriate. In addition, the length of the range of the front portion L1 and the length of the range of the rear portion L2 can be appropriately changed.

Note that the configuration disclosed in the above embodiment (including other embodiments, the same applies hereinafter) can be applied in combination with the configuration disclosed in the other embodiments as long as no contradiction occurs. The embodiments disclosed in the present specification are illustrative, and the embodiments of the present invention are not limited thereto, and may be appropriately modified within a range not departing from the object of the present invention.

Industrial applicability

The invention may be used in a combine harvester (e.g., a full-feed combine harvester, a semi-feed combine harvester). In addition, the present invention can be applied to a harvester such as a bean harvester, in addition to a combine harvester.

Second embodiment

Hereinafter, a case where an embodiment of the threshing device according to the present invention is applied to a half-feed combine harvester will be described with reference to the drawings. In this embodiment, when the front-rear direction of the travel machine body of the combine harvester is defined, the travel direction of the machine body in the working state is defined, and when the left-right direction of the machine body is defined, the left-right direction is defined in a state viewed from the travel direction of the machine body. That is, in fig. 9 and the like, the direction indicated by reference numeral (F) is the front side of the body, the direction indicated by reference numeral (B) is the rear side of the body, the direction indicated by reference numeral (L) is the left side of the body, and the direction indicated by reference numeral (R) is the right side of the body.

[ concerning the overall structure ]

As shown in fig. 9, the half-feed combine harvester includes a frame 1 and a traveling device 2 supporting the frame 1. A cab 3 is provided on the right side of the front of the machine body. The cab 3 includes an operator's part 4 on which an operator gets. An engine (not shown) is provided below driver unit 4.

A harvesting part 5 for harvesting the vertical grain stalk is arranged in front of the cab 3. The harvesting portion 5 is configured to a multi-row harvesting format (e.g., a six-row harvesting format). A grain storage box 6 for storing grains is provided behind the cab 3. A grain discharging device 7 for discharging grains in the grain storage box 6 is provided. A threshing device 9 for threshing the harvested grain stalks conveyed by the clamping conveying mechanism 8 is arranged at the left adjacent position of the grain storage box 6. The rear side of the threshing device 9 is connected with a straw conveying mechanism 11. The straw conveying mechanism 11 receives the threshed straws from the clamping and conveying mechanism 8 and clamps and conveys the threshed straws to the rear. A straw cutting device 12 for cutting the straw conveyed by the straw conveying mechanism 11 is provided below the conveying end side portion of the straw conveying mechanism 11.

[ concerning threshing devices ]

As shown in fig. 10, the threshing device 9 includes: a threshing unit 20 for threshing the crop fed from the harvesting unit 5; and a sorting unit 21 disposed below the threshing unit 20 and configured to perform sorting while conveying the threshed objects obtained from the threshing unit 20. The threshing device 9 includes left and right threshing side wall portions 23 (see fig. 11) located on both left and right sides of the threshing unit 20 and the sorting unit 21.

The threshing unit 20 includes: a pinching and conveying mechanism 8, the pinching and conveying mechanism 8 having a supply chain 8a composed of an endless rotating chain with a projection for pinching and conveying the reaped straw conveyed from the reaping part 5 toward the rear; and a drum-type threshing cylinder 25 that is rotationally driven around a rotation axis Y along the front-rear direction to perform threshing processing by processing the ear tip side of the harvested straw clamped and conveyed by the clamping and conveying mechanism 8. Further, a receiving net 26 for receiving the threshed objects processed by the threshing cylinder 25 and allowing them to fall is provided on the outer periphery of the lower part of the threshing cylinder 25. The threshing cylinder 25 extends to the rear side of the rear end of the receiving net 26.

The threshed product separated from the harvested straw by the threshing cylinder 25 is dropped onto the receiving net 26 and supplied to the sorting unit 21. On the other hand, the harvested straw from which the threshed product has been separated is delivered from the holding and conveying mechanism 8 to the straw conveying mechanism 11 that conveys the threshed straw by the threshing cylinder 25 and discharged to the outside of the machine.

The sorting unit 21 includes: a swing sorting device 27 for performing swing sorting of the threshed processed object supplied from the threshing part 20; a main air separator 28 disposed in front of and below the swing sorting device 27; an auxiliary air separator 29 disposed in front of and above the main air separator 28; a spiral primary processed material recovery unit 45 provided below the screen box 30 and recovering the primary processed material flowing down from the lower screen 38 of the sorting unit 21; a spiral secondary processed material collecting unit 46 provided below the lower screen 38 and behind the primary processed material collecting unit 45 for collecting the secondary processed material sorted by the lower screen 38 of the sorting unit 21.

The main air separator 28 supplies separation air to a fine separation area on the lower side of the swing separation device 27. The sub-air separator 29 supplies separation air to the upper rough separation region of the swing separator 27.

In the oscillating separator 27, the screen box 30 formed in a rectangular frame shape in a plan view includes a first vibrating plate 31 for rough separation, a plurality of first screen wires 32, a second vibrating plate 33 for rough separation, a plurality of second screen wires 34, an upper screen 35 for rough separation, a document sorter 36 for rough separation, a guide plate 37 in a rear-lower inclined posture, and a lower screen 38 for fine separation. An eccentric cam type driving portion 39 that swings and drives the screen box 30 is provided at the rear portion of the screen box 30. A dust discharge port 52 for discharging the straw conveyed by the screen box 30 to the outside of the apparatus is provided above the rear end portion of the screen box 30.

The first vibrating plate 31 is disposed on the front side of the rough separation area in the sieve box 30. The first vibrating plate 31 conveys the threshed objects that have leaked from the front side of the receiving net 26 rearward while performing specific gravity difference sorting.

The plurality of first screen lines 32 extend rearward and upward from the rear end portion of the first vibration plate 31 with a certain interval in the left-right direction. The plurality of first screen lines 32 are supplied to the front end portion of the upper screen 35 below while scattering the threshed objects from the first vibrating plate 31.

The second vibrating plate 33 is disposed below the dust feed port 51 on the rear side of the rough separation region in the screen box 30. The second vibrating plate 33 conveys the threshed product from the dust feeding port 51 to the rear side while performing specific gravity difference sorting.

The plurality of second screen lines 34 extend rearward from the rear end of the second vibrating plate 33 at regular intervals in the left-right direction. The plurality of second screen lines 34 are supplied to the rear end portion of the upper screen 35 and the document feeder 36 below while scattering the threshed objects from the second vibrating plate 33.

The upper screen 35 is disposed below the first vibrating plate 31 on the rear side (downstream side in the conveying direction) in the coarse separation region of the screen box 30. The upper screen 35 conveys the threshed products from the plurality of first screen lines 32, the threshed products that have leaked from the rear side of the receiving net 26, and the threshed products from the plurality of second screen lines 34 rearward while screening them.

The upper screen 35 is configured to be adjustable in opening degree. The upper screen 35 includes a plurality of screen plates 42, and the screen plates 42 are arranged in a row at predetermined intervals in the front-rear direction (conveying direction) in a state of being swingable in the front-rear direction, and are integrally swung to change the posture.

The document jogger 36 is disposed on the rear side of the upper screen 35 in the coarse sorting area of the screen box 30 in a state of being provided in connection with the upper screen 35. The straw sorter 36 conveys the threshed products from the plurality of second screen lines 34 and the threshed products from the upper screen 35 to the rear side while screening them, and discharges long torn straws (stalks) that have not leaked out to the outside of the machine through a dust discharge port 52 provided at the rear of the swing sorting device 27.

A flow distribution member 41 is disposed in a portion immediately before the upper screen 35 below the first vibrating plate 31 in the conveying direction, and the flow distribution member 41 vertically distributes the sorted air from the sub air separator 29 into a first sorted air flowing in an air passage between the first vibrating plate 31 and the upper screen 35 and a second sorted air flowing in an air passage between the upper screen 35 and the guide plate 37.

The guide plate 37 is disposed on the front side of the fine classification region in the screen box 30. The guide plate 37 guides the threshed processed products that have leaked from the front side of the upper screen 35 to flow down toward the rear side.

The lower screen 38 is disposed on the rear side of the fine sorting area in the screen box 30. The lower screen 38 conveys the threshed objects that have leaked from the rear side of the upper screen 35 and the threshed objects that have flowed down and guided by the guide plate 37 rearward while screening them.

The separation drum 43 is rotatably disposed above the screen box 30 behind the threshing cylinder 25 with a drum axis oriented in the left-right direction of the machine body as a center. The separation drum 43 separates straw chips and grains while diffusing the threshed product discharged from the dust feed port 51.

A dust exhaust fan 44 for exhausting dust to the outside is provided behind the separation drum 43. The dust exhaust fan 44 sucks and exhausts straw chips and the like, which are conveyed by the wind force from the main winnowing machine 28 and the auxiliary winnowing machine 29 in the rear-upper direction.

According to the above configuration, the sorting unit 21 can sort the threshed processed matter from the threshing unit 20 into the primary processed matter (singulated grains) flowing down from the lower screen 38, the secondary processed matter (attached branches, branched grains, etc.) supplied to the rear of the lower screen 38, and the tertiary processed matter (torn straw, straw chips, etc.) discharged from the dust discharge port 52 to the outside of the machine with high accuracy.

A first inclined portion 47 having a downwardly narrowed shape with the primary treatment object collection portion 45 at the lowermost end in a side view is provided in front of and behind the primary treatment object collection portion 45. A primary lift conveyor 61 for lifting the primary processed matter conveyed by the primary processed matter collecting unit 45 and supplying the lifted primary processed matter to the grain storage box 6 by interlocking with the primary processed matter collecting unit 45 is connected to the right end of the primary processed matter collecting unit 45. The primary processed object collecting unit 45 conveys the collected primary processed object to the right.

A second inclined portion 48 (an "inclined portion" according to the present invention) having a downwardly narrowed shape with the secondary processed material collecting portion 46 at the lowermost end in a side view is provided before and after the secondary processed material collecting portion 46. The secondary processed object collecting section 46 conveys the collected secondary processed object to the right. A secondary reducing device 62 for reducing the secondary processed material after the crushing processing by the secondary processing drum to the sorting section 21 by interlocking with the secondary processed material collecting section 46 is connected to the right end portion of the secondary processed material collecting section 46.

The dust discharge port 52 is provided with a shutter portion 53 for adjusting the opening degree of the dust discharge port 52. The baffle portion 53 is configured as a swing type cover, and swings according to the amount of straw. The baffle part 53 is pressed by straw to increase the opening degree when the discharge processing amount is large, and the opening degree is decreased to prevent the grain from leaking outside when the straw processing amount is small.

[ concerning gap-filling members ]

As shown in fig. 10 and 11, a gap-filling member 54 is provided on the outer side in the left-right direction of the screen box 30. The gap filling member 54 is formed of a flexible resin plate-like member. The gap burying member 54 is provided to bury a gap between the upper end portion of the lateral side portion 30a of the sieve box 30 and the threshing side wall portion 23 from the front end to the rear end of the sieve box 30, extending in the front-rear direction. Gap-filling members 54 are attached to the left and right lateral side portions 30a of the screen box 30.

As shown in fig. 12, the gap filling member 54 is attached to the upper end of the lateral side portion 30a of the screen box 30 by bolts and nuts via stays 55. The gap filling member 54 protrudes outward in the left-right direction from the lateral side portion 30a, and contacts the threshing side wall portion 23.

[ about the guide part ]

As shown in fig. 11 and 12, a guide portion 56 is provided on the left and right gap-filling members 54, and the guide portion 56 guides the threshed object positioned between the lateral side portion 30a of the sieve box 30 and the threshing side wall portion 23 toward the center side in the left-right direction of the sieve box 30. The guide portions 56 are provided one for each of the left and right gap-filling members 54.

In the present embodiment, the guide portion 56 is formed of a plate-like member. The guide portion 56 is provided between the upper edge portion of the lateral side portion 30a of the sieve box 30 and the threshing side wall portion 23. An edge portion of the guide portion 56 facing the gap filling member 54 is formed in a shape (substantially arc shape) along the upper surface of the gap filling member 54. The upper end of the guide portion 56 does not protrude upward beyond the upper end of the gap filling member 54. The laterally inner end of the guide portion 56 does not protrude toward the center side in the left-right direction of the screen box 30 than the laterally inner end of the stay 55.

As shown in fig. 11, the guide portion 56 is welded and fixed to the stay 55 in a state inclined so as to be positioned more rearward toward the center portion side in the left-right direction of the screen box 30. As shown in fig. 10, the guide portion 56 is provided at a position rearward of the rear end portion of the receiving net 26 in the front-rear direction. Specifically, the guide portion 56 is provided at a position rearward of the terminal end portion of the threshing cylinder 25 and rearward of the rear end portion of the second wire 34 in the front-rear direction. The guide portion 56 is provided at a position rearward of the separation drum 43 and rearward of the rear end portion of the second inclined portion 48 in the front-rear direction. The guide portion 56 is provided at a position within the existence range of the document jogger 36 in the front-rear direction. The guide portion 56 is provided at a position forward of the shutter portion 53 in a state where the opening degree of the dust discharge port 52 is minimized in the front-rear direction.

The guide surface 56a of the guide portion 56 that guides the threshed objects toward the center side in the left-right direction of the screen box 30 is formed in an inclined shape that is positioned more rearward toward the center side in the left-right direction of the screen box 30.

According to this configuration, the threshed objects located between the lateral side portions 30a of the screen box 30 and the threshing side wall portions 23 can be prevented from leaking to the outside from the rear end portion of the screen box 30.

[ other embodiments ]

Hereinafter, another embodiment in which the above embodiment is modified will be described as an example. A plurality of other embodiments described below may be combined and applied to the above embodiments as long as no contradiction occurs. The scope of the present invention is not limited to the contents of the embodiments.

(1) In the above embodiment, the description has been given taking the configuration in which the separation drum 43 is provided as an example, but the separation drum 43 may not be provided.

(2) In the above embodiment, the description has been given of the case where the guide portion 56 is provided in the front-rear direction from the position behind the separation drum 43 to the position in front of the shutter portion 53 in the state where the opening degree of the dust discharge port 52 is minimized, but the present invention is not limited to the above embodiment. For example, the guide portion 56 may be provided in the front-rear direction from a position behind the separation drum 43 to a position behind the shutter portion 53 in a state where the opening degree of the dust discharge port 52 is minimized.

(3) In the above embodiment, the description has been given taking the example in which the guide portion 56 is provided at the position rearward of the rear end portion of the second inclined portion 48, but the present invention is not limited to the above embodiment. For example, the guide portion 56 may be provided at a position within the range of the second inclined portion 48 in the front-rear direction.

(4) As shown in fig. 13, the guide portion 56 may be configured as follows: an extension portion 57 is provided, and the extension portion 57 extends toward the center portion side in the left-right direction of the screen box 30 with respect to the lateral side portions 30a of the screen box 30 and extends downward with respect to the upper end portions of the lateral side portions 30 a.

(5) In the above embodiment, the description has been given taking as an example the configuration in which the guide portions 56 are provided at one position in the front-rear direction above the respective lateral both side portions of the screen box 30, but the present invention is not limited to the above embodiment. For example, the following structure may be adopted: the guide portions 56 are provided at a plurality of positions in the front-rear direction above the respective lateral side portions of the screen box 30.

(6) In the above embodiment, the description has been given based on the example in which the guide surface 56a is formed in the inclined shape that is located more rearward toward the center portion side in the left-right direction of the screen box 30, but the present invention is not limited to the above embodiment. For example, the guide surface 56a may extend in a direction orthogonal to the surface of the lateral side portion 30a of the screen box 30.

Industrial applicability

The present invention can be applied to a harvester that travels while harvesting standing crops, and can be applied to a full-feed combine harvester, etc., in addition to a half-feed combine harvester.

Claims (15)

1. A harvester, wherein the harvesting machine is provided with a harvester,

the harvester is provided with a threshing device which is provided with a threshing part for threshing crops and a sorting part for sorting the threshed processed objects while conveying the threshed processed objects backwards,

the sorting unit includes a screen box having an upper screen for allowing the processed object to leak through a gap between each of a plurality of screen plates arranged in a conveying direction of the processed object,

the screen box is provided with: a primary treated matter recovery unit that recovers the treated matter leaked from the screen box as a primary treated matter; a secondary processed matter recovery portion that is provided downstream of the primary processed matter recovery portion in the conveying direction and that recovers the processed matter that leaks from the rear portion of the screen box as a secondary processed matter; and a slant surface portion extending in a front-rear direction from a position corresponding to a rear end portion of the upper screen toward the primary processed object collecting portion in a front-low and rear-high state to guide the primary processed object to the primary processed object collecting portion,

the interval between the second screen plates positioned on the downstream side among the plurality of screen plates is configured to be wider than the interval between the first screen plates positioned on the upstream side than the second screen plates among the plurality of screen plates.

2. A harvester according to claim 1,

the plurality of screen plates are configured to be rotatable about a horizontal axis to change the opening degree of the gap, and are configured to be rotatable in synchronization with each other as a whole.

3. A harvester according to claim 2,

the plurality of screen plates are linked to each other by link mechanisms.

4. A harvester according to any one of claims 1 to 3,

the sieve box is provided with: a first vibrating plate which is provided at a conveyance start end portion and which conveys the processed object rearward; and a second vibrating plate which is provided on the upper screen at a position downstream of the first vibrating plate in the conveying direction and which conveys the processed object rearward,

the plurality of second screen decks overlap with the second vibrating plate in the conveying direction.

5. A harvester according to any one of claims 1 to 4,

the second screen plates are respectively provided on the downstream side of a region directly above the primary processed object collecting unit in the conveying direction.

6. A threshing device, wherein the threshing device is provided with:

a threshing unit that threshes the input crop;

a sorting unit disposed below the threshing unit and configured to sort the threshing processed object obtained from the threshing unit; and

left and right threshing side wall parts located on left and right sides of the threshing part and the sorting part,

the sorting part is provided with a screen box which can swing and sort the threshed objects while transferring the threshed objects backwards through swing driving,

the screen box includes a guide portion above a lateral side portion thereof, and the guide portion guides the threshed object positioned between the lateral side portion and the threshing side wall portion toward a center portion side in a left-right direction of the screen box.

7. The threshing apparatus of claim 6,

the threshing part is provided with a threshing cylinder for threshing crops by rotary driving and a receiving net arranged on the periphery of the lower part of the threshing cylinder,

the guide portion is provided at a position rearward of a rear end portion of the receiving net in the front-rear direction.

8. The threshing apparatus of claim 7,

the threshing cylinder extends to a position which is closer to the rear side than the rear end part of the receiving net,

the guide portion is provided at a position rearward of a terminal end portion of the threshing cylinder in the front-rear direction.

9. The threshing apparatus of claim 8,

a separation drum is provided above the screen box at the rear of the threshing cylinder, the separation drum separates straw chips and grains while diffusing the threshing object,

the guide portion is disposed at a position rearward of the separation drum in the front-rear direction.

10. Threshing apparatus according to any one of claims 6 to 9,

the threshing device is provided with a dust discharging port for discharging the straw conveyed by the screen box to the outside of the device,

a baffle part for adjusting the opening degree of the dust discharge port by swinging is arranged above the rear end part of the screen box,

the guide portion is provided at a position on the front side of the baffle portion in a state where the opening degree of the dust discharge port is minimized in the front-rear direction.

11. Threshing apparatus according to any one of claims 6 to 10,

the screen box is provided with: a spiral primary processed object recovery part for recovering the sorted primary processed objects; and a spiral secondary processed object recovery part which is arranged at the rear side of the primary processed object recovery part and recovers the sorted secondary processed objects,

a slope part having a downward narrowing shape which sets the secondary processed object recovery part at the lowest end in a side view is provided in front of and behind the secondary processed object recovery part,

the guide portion is provided at a position within the existence range of the inclined portion in the front-rear direction.

12. Threshing apparatus according to any one of claims 6 to 11,

the threshing device is provided with a gap filling member which has flexibility and fills a gap between the upper end of the lateral side portion and the threshing side wall portion,

the guide portion is disposed above the gap burying member.

13. The threshing apparatus of any one of claims 6 to 12,

the guide portion includes an extension portion that extends toward a center portion side in the left-right direction of the screen box than the lateral side portions and extends downward than upper end portions of the lateral side portions.

14. The threshing apparatus of any one of claims 6 to 13,

the guide portion is provided at a plurality of positions in the front-rear direction.

15. The threshing apparatus of any one of claims 6 to 14,

the guide surface of the guide portion is formed in an inclined shape that is positioned more rearward toward the center portion of the screen box in the lateral direction.

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