JP7399039B2 - threshing equipment - Google Patents

Description

The present invention relates to a threshing device.

For example, in the threshing device disclosed in Patent Document 1, a handling drum is housed in a handling chamber, a receiving net is provided on the outer circumference of the handling drum, and the upper part of the handling drum is covered by a top plate (referred to as a "handling chamber cover" in the literature). covered. In addition, a dust valve is provided on the inner circumference of the top plate, and a cutting blade (called a "straw cutting blade" in the literature) is installed between the terminal end of the receiving net and the starting end of the dust valve in the rotational direction of the handling cylinder. It is equipped. The cutting blade is provided so as to protrude toward the center of the handling drum, and cuts the crops that are rotated by the handling drum.

JP2020-48420A

By the way, in a configuration in which a cutting blade and a dust-feeding valve are provided in the handling chamber, the threshing load tends to increase due to the cutting process by the cutting blade and the conveying process by the dust-feeding valve. In other words, if the amount of threshing increases temporarily in the handling room, there is a risk that the handling room will become clogged. Therefore, in a configuration in which a cutting blade and a dust-feeding valve are provided in the handling chamber, measures are required to suppress an increase in the threshing load and prevent clogging of the threshing material.

An object of the present invention is to provide a threshing device that can perform a smooth threshing process.

The present invention is a threshing device for threshing input crops, and the present invention provides a threshing device that threshes input crops, including a handling drum that is driven to rotate to thresh the crops, a handling chamber that accommodates the handling drum, and a top plate that covers the handling chamber from above. an arc-shaped receiving net provided on the outer circumferential side of the handling drum for leaking and sorting the processed material threshed by the handling drum; and an arc-shaped receiving net provided on the inner surface of the top plate and rotated by the handling drum. a dust feeding valve that guides the crops to the rear, and a state in which the dust feeding valve protrudes toward the center of the handling drum between the terminal end of the receiving net and the starting end of the dust feeding valve in the rotational direction of the handling drum; and a first cutting blade for cutting the crops that are rotated by the handling cylinder, between a terminal end of the first cutting blade and a starting end of the dust feeding valve in the rotation direction. is provided with an expansion space that extends in the radial direction of the handling cylinder to a position farther from the handling cylinder than the proximal end of the first cutting blade , and a recessed wall portion forming the expansion space, It is characterized in that it extends from the terminal end of the first cutting blade so that the upper side thereof is located on the opposite side to the side where the dust feeding valve is located .

According to the present invention, an expansion space is provided between the first cutting blade and the starting end of the dust feeding valve in the rotation direction. The crops cut by the first cutting blade are temporarily dispersed in the expanded space before being subjected to the conveyance action by the dust feeding valve. Therefore, even if the amount of threshed crops temporarily increases, most of the crops that have been cut by the first cutting blade can be temporarily evacuated to the expanded space. As a result, an excessive amount of crops does not enter the dust feeding valve, and an increase in the threshing load is suppressed. The dust valve can then guide the appropriate amount of crops backwards. Thereby, clogging of the threshing material is less likely to occur, and a threshing device capable of smooth threshing processing is realized.

In the present invention, the distance between the first cutting blade and the starting end of the dust feeding valve in the rotational direction is set longer than the distance between the terminal end of the receiving net and the first cutting blade in the rotational direction. It is preferable if

If the distance between the first cutting blade and the dust-feeding valve is short, the crops carried around by the handling drum will be continuously subjected to the cutting process by the first cutting blade and the conveyance process by the dust-feeding valve. , the threshing load tends to increase. According to this configuration, the distance between the first cutting blade and the starting end of the dust feeding valve in the rotation direction is set shorter than the distance between the terminal end of the receiving net and the first cutting blade. Since the distance between the cutting blade and the dust feeding valve is large, a configuration with a wide expansion space is possible. This suppresses an increase in threshing load.

In the present invention, a portion of the peripheral wall of the handling chamber between the first cutting blade and the starting end of the dust feeding valve in the rotational direction is recessed toward the outside in the radial direction of the handling barrel. It is preferable that the expansion space is formed.

With this configuration, an expansion space that extends to a position farther from the handling barrel than the base end of the first cutting blade in the radial direction of the handling barrel can be easily realized.

In the present invention, it is preferable that the inner surface portion is provided with a flat portion extending in the horizontal direction, and the flat portion extends to a downstream side in the rotational direction than a terminal end of the dust sending valve. be.

According to this configuration, the flat part extends in the horizontal direction to the downstream side in the rotational direction from the terminal end of the dust sending valve, so that the flat part becomes farther away from the handling cylinder as it goes downstream in the rotational direction in the radial direction of the handling cylinder. . For this reason, a space different from the above-mentioned expansion space is provided in the region on the lower side of the plane portion. As a result, most of the crops transported by the dust-feeding valve are guided to the space on the lower side of the flat section, and an increase in the threshing load is further suppressed.

In the present invention, the flat portion extends to the end portion of the top plate in the rotational direction, and a lateral side wall portion provided perpendicularly to a lateral side of the handling barrel is provided on a peripheral wall portion of the handling chamber. It is preferable that the flat part includes a planar inclined part extending between the rotational direction end part and the horizontal side wall part of the planar part.

According to this configuration, the inclined portion is provided between the end portion in the rotational direction of the flat portion and the horizontal side wall portion, and the inclined portion is formed in a flat shape. For this reason, compared to a configuration in which the inclined portion is formed in an arc shape along the rotational direction of the handling drum, a space away from the handling drum in the radial direction of the handling drum can be easily formed. As a result, the crops can be moved around by the handling barrel and evacuated to a space away from the handling barrel. As a result, the increase in threshing load is further suppressed.

In the present invention, it is preferable that the inclined portion is provided with a second cutting blade that is provided in a state of protruding toward the center of the handling drum and that cuts the crops that are rotated by the handling drum. .

With this configuration, the crops carried by the handling cylinder are cut on the upper side and the lower side of the rotation direction relative to the dust feed valve, so the cutting process of the crops is accelerated and the threshing load is increased. decreases toward the rear in the conveyance direction.

FIG. 2 is an overall side view of the combine harvester. FIG. 2 is a diagram schematically showing a threshing device. It is a cross-sectional view showing a handling room. It is a cross-sectional view of another embodiment showing a handling room.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which is an example of this invention is described based on drawing. In the following description, regarding the traveling body 1 of the combine harvester, the direction of the arrow "F" shown in FIGS. 1 and 2 will be referred to as "the front of the body", and the direction of the arrow "B" will be referred to as the "rear of the body". Further, in FIGS. 1 and 2, the direction toward the front of the paper is referred to as the "left side of the aircraft," and the direction toward the back of the paper is referred to as the "right side of the aircraft." The direction of the arrow "L" shown in FIGS. 3 and 4 is defined as "the left side of the aircraft," and the direction of the arrow "R" shown in FIGS. 3 and 4 is defined as the "right side of the aircraft."

[About the entire combine harvester]
As shown in FIG. 1, a traveling body 1 of a combine harvester includes a body frame 2, and the body frame 2 is constructed by connecting a plurality of steel materials such as square pipe materials. A pair of left and right crawler-type traveling devices 3 are installed at the bottom of the fuselage frame 2. A driving section 5 is provided on the right side of the front part of the traveling body 1. The boarding space of the driving section 5 is covered by a cabin. An engine E is arranged below the driving section 5. A reaping section 4 is provided at the front of the traveling body 1 so as to be movable up and down. The reaping section 4 reaps planted grain culms (crops) of rice and wheat in a plurality of planting rows in front of the traveling machine body 1 while raising them, and conveys the harvested grain culms toward the rear of the machine body. A threshing device 6 and a grain storage tank 8 are supported in a side-by-side manner at the rear of the body frame 2. The threshing device 6 is arranged at the rear of the reaping section 4, and the grain storage tank 8 is arranged at the rear of the driving section 5. A feed chain 7 is provided on the left side of the threshing device 6, and the feed chain 7 pinches and conveys the harvested grain culm cut by the reaping section 4 to the rear. In the threshing device 6, the input harvested grain culm is threshed, and a sorting process is performed to separate the grains obtained by the threshing process from dust. The grain storage tank 8 stores the grains conveyed from the threshing device 6. A grain discharge device 9 for taking out grains from the grain storage tank 8 is connected to the rear part of the grain storage tank 8 .

[Threshing device]
A threshing device 6 is shown in FIG. The threshing device 6 is equipped with a threshing section 10 and a sorting section 11. A threshing section 10 threshes crops, and a sorting section 11 sorts the threshed products while conveying them rearward. The threshing section 10 is equipped with a handling cylinder 12, a receiving net 14, a separating drum 15, and a dust exhaust fan 16. A handling chamber 13 is formed in the threshing section 10, and the handling chamber 13 accommodates the handling barrel 12. A handling barrel 12 is provided in the handling room 13 so as to extend in the longitudinal direction of the machine body, and the handling barrel 12 is rotatable around a rotation axis Y1 extending in the longitudinal direction of the machine body. The handling drum 12 is equipped with a handling drum drum 17, a plurality of handling teeth 18, and a support shaft 19. The longitudinal direction of the support shaft 19 is along the rotation axis Y1, and the handling drum 17 rotates integrally with the support shaft 19. The handling teeth 18 are mounted on the circumferential surface of the handling drum 17. The support shaft 19 is supported by front and rear side plates 30, 30, respectively.

A handling port 20 (see FIG. 3) is formed on the left side of the threshing device 6, through which the harvested grain culm passes. The harvested grain culms are harvested by the harvesting section 4 and conveyed rearward by the feed chain 7, and are fed into the handling chamber 13 from the handling port 20. Then, the feed chain 7 transports the harvested grain culm from the reaping section 4 with the tip of the harvested grain culm thrown into the handling chamber 13.

The handling cylinder 12 is rotationally driven to thresh the harvested grain culm. The harvested grain culm, which is held and conveyed rearward by the feed chain 7, is threshed in the handling chamber 13 by being hit and combed by the rotation of the handling cylinder 12. An arc-shaped receiving net 14 is provided below the handling cylinder 12. The receiving net 14 is provided on the outer circumferential side of the handling drum 12, and performs a leakage sorting process on the processed material threshed by the handling drum 12. A separation drum 15 is provided behind the handling cylinder 12. The separation drum 15 is a diffusion drum, and promotes the flow of single grains and the like contained therein through the object to be sorted. A dust exhaust fan 16 is provided behind the separation drum 15 to exhaust dust to the outside.

A top plate 33 that can be opened and closed and covers the handling barrel 12 from above is provided on the top of the threshing device 6. The top plate 33 extends rearward from the rear end of the handling cylinder 12. A plurality of dust feeding valves 34 are provided on the inner surface of the top plate 33, that is, on the surface portion on the side where the handling cylinder 12 is located. The plurality of dust feeding valves 34 are provided above the handling barrel 12 in a state in which they are lined up at intervals in a direction along the rotation axis Y1 of the handling barrel 12. Each of the dust feeding valves 34 is configured to be able to swing around the vertical axis and change the feeding angle for sending the harvested grain culms to the rear of the machine body. Further, an interlocking link (not shown) is connected in the front-rear direction on one end side of the plurality of dust feeding valves 34, and the respective dust feeding valves 34 swing while interlocking with each other via the interlocking link. With this configuration, the dust feed valve 34 guides the crops entrained by the handling barrel 12 rearward.

The sorting section 11 is provided below the threshing section 10, that is, at the bottom of the threshing device 6. The sorting section 11 is equipped with a swing sorting device 21, a winnowing machine 22, a first article collection section 23, and a second article collection section 24. The swinging sorting device 21 swings and sorts the objects to be sorted. The winch 22 blows sorting air to the swinging sorting device 21. The first product collection unit 23 collects the first grains (single grains, etc.). The second product collection unit 24 collects second product grains (kernels with stems, etc.). The first grain collecting section 23 is provided with a first screw 25, which conveys the first grain to the right. A grain lifting device 26 is interlocked and connected to the right end of the first screw 25, and the grain lifting device 26 transports the first grain to the grain storage tank 8. A second screw 27 is provided in the second grain collecting section 24, and the second screw 27 conveys the second grain to the right. A second reducing device 28 is interlocked and connected to the right end of the second screw 27, and the second reducing device 28 returns the second grain to the swing sorting device 21.

[About the handling room]
As shown in FIG. 3, the handling cylinder 12 includes a receiving net 14, a handling chamber guide 31, a top plate 33, an upper lip plate 35, a lower lip plate 36, and an inclined portion 38 in the circumferential direction. being surrounded. In this embodiment, the handling chamber guide 31, the top plate 33, the upper lip plate 35, the lower lip plate 36, and the inclined part 38 are included in the "peripheral wall part" of the present invention.

An upper lip plate 35 and a lower lip plate 36 are provided on the left side of the threshing device 6. A handling opening 20 is formed between the upper lip plate 35 and the lower lip plate 36, through which the harvested grain culm for threshing processing passes. The upper lip plate 35 is the "horizontal side wall part" of the present invention, and is provided vertically on the lateral side of the handling barrel 12. The upper lip plate 35 is supported by the front and rear side plates 30, respectively. The lower end portion of the lower lip plate 36 is connected to the receiving net 14 along the rotation direction R1 of the handling cylinder 12.

The receiving net 14 extends along the rotational direction R1 of the handling cylinder 12 to the lower end of the lower lip plate 36 and the handling chamber guide 31 on the upper right side of the handling cylinder 12. In FIG. 3, the end of the receiving net 14 on the side where the handling chamber guide 31 is located is shown as the terminal end 14f in the rotation direction R1 of the handling cylinder 12. A handling chamber guide 31 is provided on the upper right side of the handling cylinder 12 (upper left side in the plane of FIG. 3), and the lower end of the handling chamber guide 31 is connected to the terminal end 14f of the receiving net 14.

A plurality of cutting blades 32 are attached to the handling chamber guide 31 so as to be lined up in the front-rear direction. The cutting blade 32 is the "first cutting blade" of the present invention, and is located between the terminal end 14f of the receiving net 14 and the starting end 34s of the dust feeding valve 34 in the rotation direction R1 of the handling cylinder 12. It is provided so as to protrude toward the center of the The cutting blade 32 cuts the crop that is rotated by the handling cylinder 12.

An upper frame 37 that extends in the front-rear direction across the front and rear portions of the threshing device 6 is provided in the lateral outer region of the machine body at the top of the threshing device 6 (top right region in the paper plane of FIG. 3). The upper frame 37 is supported by the front and rear side plates 30, 30. The top plate 33 is swingably supported by the left upper frame 37 via a support member 37A. With this configuration, the top plate 33 is configured to be vertically swingable to open and close around the front-back swing axis Y3 located on the lateral outer side (left side) of the aircraft body.

The inner surface of the top plate 33 is provided with a flat part 33h that extends along the horizontal direction and faces the handling chamber 13. The flat portion 33h is formed in a flat shape in the rotational direction R1 of the handling cylinder 12, extending from the rotational direction start end 33s to the rotational direction terminal end 33f. A plurality of dust feeding valves 34 are supported on this plane portion 33h so as to be swingable around the vertical axis.

The starting end 33s of the flat portion 33h in the rotational direction is located laterally inside the body (on the left side of the paper in FIG. 3) than the starting end 34s of the dust feeding valve 34. Further, the rotational direction end portion 33f of the flat portion 33h is located on the outer side of the body (on the right side of the paper in FIG. 3) than the end portion 34f of the dust sending valve 34. For this reason, the flat portion 33h extends to the downstream side of the terminal end portion 34f of the dust feeding valve 34 in the rotational direction R1. That is, in the rotation direction R1 of the handling cylinder 12, the area of the flat portion 33h is configured to be wider than the area of the dust feeding valve 34. The greater the inclination of the dust feeding valve 34 in the longitudinal direction with respect to the lateral direction of the aircraft in plan view, the longer the separation distance L3 between the terminal end 34f of the dust feeding valve 34 and the rotational direction terminal end 33f of the flat portion 33h becomes longer. .

In addition, in FIG. 3, the rotational direction starting end 33s and the rotational direction terminal end 33f in the flat part 33h, and the starting end 34s and the terminal end 34f in the dust feeding valve 34 are shown as circles. The marks clearly indicate the starting end 33s in the rotating direction, the ending end 33f in the rotating direction, the starting end 34s, and the ending end 34f, and the circles themselves are not objects. The same applies to the circles at a rotational direction starting end 33s, a rotational direction terminal end 33f, a starting end 34s, and a terminal end 34f shown in FIG. 4, which will be described later.

A planar inclined portion 38 is provided between the upper lip plate 35 and the top plate 33. The flat portion 33h extends to the end portion 33f in the rotation direction of the top plate 33, and the inclined portion 38 and the top plate 33 come into contact in the region of the end portion 33f in the rotation direction. The inclined portion 38 is provided so as to extend between the rotational direction end portion 33f and the upper end portion of the upper lip plate 35.

The front and rear side plates 30, 30 support the handling trunk 12 and are vertically swingable around a swing axis Y2 located on the lateral inner side of the fuselage (the right side of the fuselage, the left side of the paper in FIG. 3). The handling barrel 12 integrally pivots up and down around the pivot axis Y2 with the side plate 30, the handling chamber guide 31, the cutting blade 32, the top plate 33, the dust feeding valve 34, the inclined part 38, the upper lip plate 35, and the upper frame 37. It is configured to be movable.

As shown in FIG. 3, in the rotation direction R1 of the handling cylinder 12, an expansion space S is provided between the cutting blade 32 and the starting end 34s of the dust feeding valve 34. The expansion space S is formed by a recessed wall portion 31a formed in the upper part of the handling room guide 31 and a region of the rotation direction starting end portion 33s of the top plate 33. In this way, the portion of the peripheral wall of the handling chamber 13 between the cutting blade 32 and the starting end 34s of the dust feeding valve 34 in the rotational direction R1 is recessed toward the outside in the radial direction of the handling barrel 12. , an expanded space S is formed. In the radial direction of the handling cylinder 12, the rotational direction starting end 33s is located radially outward from the protruding base end of the cutting blade 32 by H1. In other words, in the radial direction of the handling cylinder 12, the expansion space S extends to a position farther away from the handling cylinder 12 than the base end of the cutting blade 32.

In FIG. 3, the distance between the terminal end 14f of the receiving net 14 and the protruding tip of the cutting blade 32 in the rotation direction R1 is indicated by a first distance L1. Further, in the rotation direction R1, the distance between the protruding tip of the cutting blade 32 and the starting end 34s of the dust feeding valve 34 is indicated by a second distance L2. In this embodiment, the second distance L2 in the rotation direction R1 is set longer than the first distance L1. The second distance L2 becomes longer as the dust feeding valve 34 inclines more in the front-rear direction with respect to the lateral direction of the aircraft in plan view.

If the distance between the cutting blade 32 and the dust feeding valve 34 is short, the reaped grain culm carried around by the handling cylinder 12 can continuously undergo cutting processing by the cutting blade 32 and conveyance processing by the dust feeding valve 34. receive it. That is, the cutting resistance at the cutting blade 32 and the conveying resistance at the dust feeding valve 34 continuously act on the reaped grain culm that is carried around by the handling barrel 12. With this configuration, even if the amount of threshing increases temporarily in the handling chamber 13, the threshing load increases, and there is a risk that the handling chamber 13 will become clogged.

In this embodiment, since the expansion space S exists between the cutting blade 32 and the dust feeding valve 34, when the reaped grain culm is cut by the cutting blade 32, the reaped grain culm after the cutting process is placed in the expansion space S. to spread. With this configuration, even if the amount of threshing increases temporarily in the handling chamber 13, most of the reaped grain culms cut by the cutting blade 32 temporarily retreat to the expansion space S, and then, The dust is sent to the rear of the aircraft by the dust sending valve 34. This suppresses an increase in conveyance resistance in the dust feeding valve 34. In other words, the peak of the conveying resistance in the dust feeding valve 34 is cut. Thereby, even if the amount of threshing increases temporarily in the handling chamber 13, an increase in the threshing load is suppressed, and clogging in the handling chamber 13 is less likely to occur.

Further, in this embodiment, the flat portion 33h extending in the horizontal direction extends to the downstream side of the rotation direction R1 from the terminal end portion 34f of the dust sending valve 34. Therefore, the reaped grain culm that has been subjected to the conveyance process by the dust sending valve 34 is spread to the rotational direction end portion 33f of the flat portion 33h, that is, the corner between the top plate 33 and the inclined portion 38. In other words, even if the amount of threshing increases temporarily in the handling chamber 13, the reaped grain culm subjected to the conveying action by the dust sending valve 34 can temporarily retreat to the region of the rotational direction end portion 33f. As a result, an increase in the threshing load is suppressed, and clogging in the handling chamber 13 is less likely to occur.

[Another embodiment]
The present invention is not limited to the configurations illustrated in the above-described embodiments, and other representative embodiments of the present invention will be illustrated below.

(1) In the above-described embodiment, the plurality of cutting blades 32 are provided in the handling chamber guide 31 so as to be lined up in the front-rear direction, but the present invention is not limited to this embodiment. For example, as shown in FIG. 4, in addition to the cutting blade 32, the inclined portion 38 is provided with one or more cutting blades 40 as a "second cutting blade" in a state of protruding toward the center of the handling cylinder. It's okay to be beaten. When a plurality of cutting blades 40 are provided, the plurality of cutting blades 40 may be provided on the inclined portion 38 so as to be lined up in the front-rear direction. The cutting blade 40 cuts the crop that is rotated by the handling cylinder 12. The crops being carried around by the handling barrel 12 are cut between the cutting blade 32 on the upper side in the rotational direction R1 with respect to the dust feeding valve 34 and the cutting blade 40 on the lower side in the rotational direction R1 with respect to the dust feeding valve 34. The cutting process is performed separately. Therefore, the cutting process of the crops is promoted, and the threshing load decreases toward the rear in the conveyance direction.

(2) In the embodiment described above, the second distance L2 in the rotation direction R1 is set longer than the first distance L1, but the invention is not limited to this embodiment. As long as the expansion space S is provided between the cutting blade 32 and the starting end 34s of the dust sending valve 34, the first distance L1 and the second distance L2 in the rotation direction R1 may be the same.

(3) In the above-described embodiment, the recessed wall portion 31a formed in the upper part of the handling chamber guide 31 extends along the radial direction of the handling cylinder 12, but the present invention is not limited to this embodiment. For example, the recessed wall portion 31a may be configured to extend in the vertical direction and come into contact with the top plate 33.

(4) In the above-described embodiment, the planar inclined portion 38 is provided between the upper lip plate 35 and the top plate 33, but the present invention is not limited to this embodiment. For example, the configuration may be such that the inclined portion 38 is not provided. In this case, the upper end portion of the upper lip plate 35 extending vertically may be in contact with the flat portion 33h of the top plate 33.

(5) In the above-described embodiment, the threshing device 6 is configured to thresh the tip side portion of the harvested grain culm that is pinched and conveyed by the feed chain 7, but is not limited to this embodiment. For example, the threshing device 6 may be configured to throw all the harvested grain culms into the handling chamber 13.

Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as no contradiction occurs. Further, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the purpose of the present invention.

The present invention is applicable not only to a threshing device installed in a combine harvester, but also to a single threshing device.

6: Threshing device 12: Handling cylinder 13: Handling room 14: Reception net 14f: Terminal part 32: Cutting blade (first cutting blade)
33 : Top plate 33h : Plane part 33f : End part in rotation direction 34 : Dust feeding valve 34f : End part 34s : Starting end part 35 : Upper lip plate (lateral side wall part)
38: Inclined part 40: Cutting blade (second cutting blade)
L1: First distance (distance between the end of the receiving net and the first cutting blade)
L2: Second distance (distance between the first cutting blade and the starting end of the dust sending valve)
R: Rotation direction S: Expansion space

Claims (6)

A threshing device for threshing input crops,
A handling cylinder that is rotatably driven to thresh crops;
a handling room that accommodates the handling cylinder;
a top plate that covers the handling room from above;
an arc-shaped receiving net provided on the outer circumferential side of the handling drum for leaking and sorting the processed material threshed by the handling drum;
a dust-feeding valve provided on the inner surface of the top plate and configured to guide the crops being rotated by the handling barrel rearward;
Crops that are provided between the terminal end of the receiving net and the starting end of the dust feeding valve in the rotational direction of the handling cylinder in a state that protrudes toward the center of the handling cylinder, and are rotated by the handling cylinder. A first cutting blade is provided for cutting the
Between the terminal end of the first cutting blade in the rotational direction and the starting end of the dust sending valve, in the radial direction of the handling cylinder, the area is further away from the handling barrel than the base end of the first cutting blade. Equipped with an expansion space that extends to distant locations ,
A threshing device in which a recessed wall portion forming the expansion space extends from the terminal end portion of the first cutting blade so that the upper side thereof is located on a side opposite to the side where the dust feeding valve is located. A distance between the first cutting blade and a starting end of the dust feeding valve in the rotational direction is set to be longer than a distance between a terminal end of the receiving net and the first cutting blade in the rotational direction. 1. The threshing device according to 1. A portion of the peripheral wall of the handling chamber between the first cutting blade and the starting end of the dust feeding valve in the rotational direction is recessed toward the outside in the radial direction of the handling barrel, thereby causing the expansion. The threshing device according to claim 1 or 2, wherein a space is formed. The inner surface portion is provided with a flat portion extending along the horizontal direction,
The threshing device according to any one of claims 1 to 3, wherein the flat portion extends to a downstream side in the rotational direction from a terminal end of the dust feeding valve. The flat portion extends to a rotational end portion of the top plate,
A horizontal wall portion provided perpendicularly to the lateral side of the handling cylinder on a peripheral wall portion of the handling chamber, and a flat surface provided in a state extending between the rotational direction end portion of the flat portion and the horizontal side wall portion. The threshing device according to claim 4, further comprising a sloped portion having a shape. The threshing device according to claim 5, wherein the inclined portion is provided with a second cutting blade that is provided in a state of protruding toward the center of the handling drum and that cuts the crops that are rotated by the handling drum. .

Images