CN209845749U - Threshing machine - Google Patents

Abstract

The utility model relates to a threshing machine. Characterized in that the sorting chamber (17) is provided with: a winnower (15) which generates separation wind; and a swing sorting shelf (20) which is reciprocally swung in the front-rear direction, wherein the swing sorting shelf (20) is provided with: a transfer shelf part (22) which receives the processed object falling from the threshing chamber (11) and transfers the processed object to the rear; a 1 st sorting unit (F) which is disposed behind the transfer shelf section (22) and is configured by a plurality of 1 st sorting members spaced apart from each other in the front-rear direction; a 2 nd sorting unit (24) disposed behind the 1 st sorting unit (F) and configured by a plurality of 2 nd sorting members spaced apart from each other in the left-right direction; and a sorting net (30) disposed above the 1 st sorting unit (F), wherein the rear end of the sorting net (30) is located at the middle part of the 2 nd sorting unit (24) in the front-rear direction.

Description

Threshing machine

Technical Field

The utility model relates to a threshing machine.

Background

Conventionally, the following structures are known: a swing sorting device is provided below the threshing chamber, and a sieve for sorting out grains from falling objects from the threshing chamber is provided on a swing sorting shelf (see patent document 1).

Patent document 1: japanese patent laid-open publication No. 2016-59366

In the known example, there are problems as follows: since the structure is such that grains are sorted from a falling material by a sieve, when the sieve interval is made small to improve the sorting accuracy, loss and clogging are likely to occur, and when the sieve interval is made large, the sorting accuracy is lowered.

SUMMERY OF THE UTILITY MODEL

The utility model provides an improve the structure of swing separation shelf, aim at compromise the improvement of the sorting precision of mung bean and reduce the loss of threshing.

The utility model of the aspect 1 is a threshing machine having: a threshing chamber (11) having a threshing cylinder (10) for threshing the crop; and a separation chamber (17) disposed below the threshing chamber (11), wherein the threshing machine is characterized in that the separation chamber (17) has: a winnower (15) which generates separation wind; and a swing sorting shelf (20) that swings back and forth in the front-rear direction, the swing sorting shelf (20) having: a transfer shelf part (22) which receives the processed object falling from the threshing chamber (11) and transfers the processed object to the rear; a 1 st sorting unit (F) disposed behind the transfer shelf unit (22) and configured by a plurality of 1 st sorting members arranged at intervals in the front-rear direction; a 2 nd sorting unit (24) disposed behind the 1 st sorting unit (F) and configured by a plurality of 2 nd sorting members spaced apart from each other in the left-right direction; and a sorting net (30) disposed above the 1 st sorting unit (F), wherein a rear end portion of the sorting net (30) is located at a middle portion in the front-rear direction of the 2 nd sorting unit (24).

The utility model described in claim 2 is the threshing machine according to claim 1, wherein the threshing machine has a screen wire (35) above a middle portion in the front-rear direction of the separation net (30).

The utility model according to claim 3 is the threshing machine according to claim 1 or 2, wherein the 1 st sorting section (F) has a front side screen (23A) and a rear side screen (23B), the rear side screen (23B) is disposed behind the front side screen (23A), and the rear side screen (23B) has a sorting member whose inclination angle can be adjusted.

The utility model according to claim 4 is the threshing machine according to claim 3, wherein the rear side screen (23B) is disposed at a lower position than the front side screen (23A).

In the utility model described in claim 1, since the rear end portion of the sorting net (30) disposed above the 1 st sorting unit (F) is located at the middle portion in the front-rear direction of the 2 nd sorting unit (24), the foreign matter can be collected by the rear portion of the 2 nd sorting unit (24) while suppressing the dropping of the foreign matter into the 1 st sorting unit (F), and the loss due to the discharge of the collection target matter to the outside of the machine can be prevented.

In addition to the effects of the invention according to claim 1, according to the invention of claim 2, since the open part (H) where the sorting net (30) does not exist is formed at the rear part of the 2 nd sorting part (24), the object to be collected can be collected by the rear part of the 2 nd sorting part (24), and the loss due to the discharge of the object to the outside of the machine can be prevented.

In the utility model according to claim 3, in addition to the effect of the utility model according to claim 1, since the screen wire (35) is provided above the intermediate portion in the front-rear direction of the separation net (30), foreign matters falling down toward the separation net (30) are caught by the screen wire (35), thereby the separation efficiency of the separation net (30) and the 1 st separation part (F) therebelow can be improved, and the separation loss can be suppressed.

In the utility model according to claim 4, in addition to the effects of the utility model according to any one of claims 1 to 3, the rear side screen (23B) has a sorting member whose inclination angle with respect to the horizontal plane can be adjusted, and therefore the wind direction of the sorting wind is changed by changing the inclination angle of the sorting member of the rear side screen 23B, and the loss can be reduced.

In the utility model according to claim 5, in addition to the effect of the utility model according to claim 4, the rear side screen (23B) is disposed at a position lower than the front side screen (23A), and therefore the sorting accuracy and efficiency of the sorting wind blown upward can be improved by the rear side screen (23B).

Drawings

Fig. 1 is a side view of a harvester.

Fig. 2 is a longitudinal sectional side view of the threshing device (thresher).

Fig. 3 is a longitudinal sectional side view of the oscillating sorting shelf.

Fig. 4 is a top view of a swinging sorting shelf.

Fig. 5 is a side view of other embodiments of oscillating sorting shelves.

Fig. 6 is a top view of a swinging sorting shelf.

Fig. 7 is a partial side view of other embodiments of oscillating sorting shelves.

Description of the reference symbols

4: a harvesting device; 9: a conveying elevator; 10: a threshing cylinder; 11: a threshing chamber; 15: a winnower; 17: a sorting chamber; 20: swinging the sorting shelf; 22: a transfer shelf section; 23A: a front side screen; 23B: a rear side screen; 24: a manuscript-by-manuscript device; 30: coarse screening; 35: screening wires; f: sieving; k: an open portion.

Detailed Description

An embodiment of the present invention will be described with reference to the drawings, in which a harvester (combine) includes a body frame 1, a travel device 2, a hulling device (thresher) 3 provided above the body frame 1, a harvesting device 4 provided in front of the hulling device 3, a grain tank 5 provided in a side portion of the hulling device 3, an operation portion 6 provided in front of the grain tank 5, and the like (fig. 1).

The harvester of the present invention is used for harvesting seeds of crops (oil-bearing grains) such as sesame, vegetable seeds, and sunflowers, which are planted in a field, in addition to beans such as grains of rice and wheat, grains of buckwheat, soybeans, mung beans, or peas (peas), and the like, and although the description is made in a manner that generalized grains contain these seeds for convenience, the structure of the present invention is not limited thereto. Note that the directions are shown for convenience of understanding and the description has been made, but the configuration is not limited to these directions.

The harvesting apparatus 4 is constituted by arranging a gathering reel 8A and a cutter 8B on an auger carrier 8 having an auger 7 mounted on its shaft, and the front end of a conveying elevator 9 is mounted on the auger carrier 8, and the base of the conveying elevator 9 is connected to a threshing chamber of the threshing apparatus 3.

As shown in fig. 2, a threshing chamber 11 is provided at an upper portion of the threshing device 3, a threshing cylinder 10 is mounted on the threshing chamber 11 in a substantially horizontal manner, a lower side of the threshing cylinder 10 is mainly surrounded by a threshing net 12, and a winnower housing 16 of a winnower 15 is provided below the threshing net 12. A sorting chamber 17 is formed below the threshing chamber 11, the sorting chamber 17 is configured to perform winnowing of grains (including seeds of beans, flax, and rapeseed, and pods thereof) and foreign matter by the air blown from the winnower 15, and a swing sorting shelf 20 that swings back and forth along the air blowing direction (front-rear direction) of the winnower 15 is provided in the sorting chamber 17.

The swing sorting shelf 20 is formed with a transfer shelf portion 22 having a leading end portion (front end portion) positioned above the winnower 15. A screen (also referred to as "sorting section 1") F is provided on the downstream side of the transfer shelf section 22 in the transfer direction. There are a plurality of fins (also referred to as "sorting member 1") 32 at the screen F.

The sorting chamber 17 has therein: a document sorter (also referred to as "sorting section 2") 24 provided downstream of the screen F; a primary conveyor 25 disposed at a predetermined position below the swing sorting shelf 20; a secondary conveyor 26 provided on the rear side of the primary conveyor 25; and a secondary returning device 27 for returning the secondary screened material to the threshing chamber 11 and performing re-threshing treatment. In the document jogger 24, there are a plurality of rack plates (also referred to as "2 nd sorting means").

A coarse screen (also referred to as "sorting screen") 30 is provided above the screen F. The rough separation net 30 performs rough separation so that the stem/branch of mung bean (part of grain stalk in case of rice and wheat) does not fall onto the sieve F.

The coarse screen 30 has an arbitrary structure, and preferably has a mesh number such that grains and pods thereof fall but inclusions such as stems and leaves thereof do not fall. Alternatively, the rougher screen 30 may be constructed of a wire mesh, a plain screen or a perforated sheet.

Therefore, the drop of the harvested (recovered) seeds and foreign matter other than pods is suppressed, the drop of the seeds and pods of mung beans is promoted, and the sorting treatment efficiency is improved.

In the present embodiment, the front end of the rough-sizing screen 30 is located at the rear end of the transfer shelf portion 22, and the rear end of the rough-sizing screen 30 is located above the front end of the document sorter 24 (fig. 2).

Therefore, the rough-sizing net 30 covers the entire upper portion of the screen F in the front-rear direction in a side view, suppresses the dropping of the foreign matters onto the screen F, and is opened above the document sorter 24, so that the pods (not threshed) that have not broken are collected in the secondary conveyor 26, returned to the threshing chamber 11 by the secondary returning device 27, and re-threshed.

This prevents the pod not threshed from scattering and being discharged outside the machine, thereby preventing a discharge loss.

In other words, the roughing net 30 provided above the screen F is configured such that a part of the rear portion of the document collector 24 is opened, the document collector 24 is provided below the opened portion K, and the secondary chute 31 is provided below the document collector 24.

Therefore, the drop of the foreign matters due to the rough separation net 30 above is prevented at the leading end of the document sorter 24, the object to be processed including the ungranulated pod is dropped through the opening portion K at the distal end side of the document sorter 24, and the object to be processed and the foreign matters are sorted by the document sorter 24, so that the drop of the foreign matters to the secondary chute 31 is suppressed, and the secondary screen recovery efficiency and the secondary screen reprocessing efficiency can be improved.

In the screen F, a front screen 23A and a rear screen 23B are arranged in parallel in the front and rear directions, and at least the rear screen 23B is configured such that the inclination angle of a fin (also referred to as "sorting member 1") 32 can be freely adjusted (fig. 3).

Therefore, the separation air is blown upward between the front screens 23A at a predetermined inclination angle of the fins 32 of the front screen 23A, the separation action of grains and inclusions is performed on the front half portion of the swing separation shelf 20, and the grains and inclusions fall down to the primary conveyor 25 at an early stage, thereby reducing the loss.

Further, by changing the inclination angle of the rear screen 23B in accordance with conditions such as the amount of the object to be processed, the air volume of the sort air between the fins 32 of the rear screen 23B can be adjusted, and the sort processing according to the sort load can be performed.

A wire screen 35 is provided above the rougher screen 30 in the front and rear middle portions of the oscillating sorting shelf 20.

Therefore, the screen wire 35 catches the foreign matters falling onto the rough separation net 30, and the screen wire 35 promotes the separation treatment effect, promotes the entire separation, and suppresses the separation loss.

The fins 32 of the rear screen 23B are positioned lower than the fins 32 of the front screen 23A.

Therefore, an upward blowing effect of blowing upward the sorting wind flowing from the front side by the rear screen 23B can be expected, and sorting accuracy and efficiency can be improved.

Further, if the screen line 35 is provided above the leading end portion of the rear screen 23B, the sorting air is blown through the screen line 35 from below, and the sorting effect can be further improved.

In addition, the screen wire 35 is positioned substantially above the primary conveyor 25.

Therefore, the grains sorted by the screen line 35 can be promoted to enter the primary conveyor 25, and the recovery efficiency can be improved.

The screen wire 35 is attached to the main body 36 side of the oscillating sorting shelf 20 for each rough screen 30 from above the rough screen 30.

Therefore, the screen wire 35 can also serve as a fixing member for the coarse screen 30 as well as catch foreign matter before dropping onto the coarse screen 30.

As shown in fig. 7, a rear screen wire 35 may be provided above the roughing net 30 on the rear side in the front-rear direction of the swing sorting shelf 20.

Therefore, the separated foreign matters are not dropped onto the coarse separation net 30, but are easily discharged directly to the outside of the machine.

The grains separated by the rear screen 35 are dropped from the lower straw shaker (end screen 23C)24, caught by the secondary chute 31, and are collected by the secondary conveyor 26.

Therefore, sorting loss can be reduced.

The rear screen line 35 provided above the rougher screen 30 behind the swing sorting shelf 20 is inclined so as to be lower in front and higher in rear.

Therefore, the separated foreign matters are not dropped onto the coarse separation net 30, but are easily discharged directly to the outside of the machine.

The grains separated by the rear screen 35 are dropped from the lower straw shaker (end screen 23C)24, caught by the secondary chute 31, and collected by the secondary conveyor 26.

Therefore, sorting loss can be reduced.

Although not shown, a lever for fixing the rough separation net 30 is provided at a predetermined position above the rough separation net 30 provided on the swing separation shelf plate 20, and the tip of the lever may be bent upward.

The rod is cheaper than the screen wire 35, and the same operation and effect as the screen wire 35 can be expected.

The rods having the distal ends bent upward are provided at two positions, i.e., a front portion and a central portion, above the rougher screen 30 of the swinging sorting shelf 20.

Therefore, the rod of the secondary structure functions to jump the foreign matter like a jump table, and promotes separation of the processed object from the particles of the foreign matter.

A wave plate member (transfer shelf 22) having a wave plate shape in a side view is provided on the swing sorting shelf 20 at a position on the front side of the front-rear middle portion.

If the pitch of the wave portions (rack) of the wave plate member (transfer shelf 22) is set to be narrower in the front half and wider in the rear half, the transfer efficiency can be improved.

Although not shown, a baffle plate may be provided at the rearmost portion of the swing sorting shelf 20. The baffle is configured to be adjustable up and down. The baffle also serves as a fixing member for fixing the end of the coarse screen 30.

The baffle plate can increase the secondary return amount and reduce the loss by intercepting the transportation of the processed object.

Fig. 7 shows another embodiment, in which a terminal screen 23C is provided instead of the document jogger 24 at the terminal end portion of the swing sorting shelf 20, and a guide plate 45 for adjusting the wind direction is provided between the leading end portion of the terminal screen 23C and the terminal end portion of the screen F.

Therefore, the upward degree of the sorting air in the vicinity of the guide plate 45 can be adjusted, and the pellets can be prevented from being discharged to the outside of the machine, so that the recovery rate of the secondary conveyor 26 can be improved.

The second fan 49 blows air toward the end screen 23C, and the sorting efficiency of the end screen 23C can be improved.

The upper and lower intermediate portions of the guide plate 45 are rotatably attached to the swing sorting shelf 20 via a shaft 47, and the upper portion of the guide plate 45 is rotatably attached to a connecting plate 46 for adjusting the inclination angle of the fins 32 of the screen F via a pin 48.

Therefore, the guide plate 45 is adjusted in inclination angle in conjunction with the fins 32 of the screen F.

Therefore, when the fins 32 of the screen F are "closed", the guide plate 45 stands up so that the sort air is directed upward.

Further, the following structure can be adopted: when the flow rate is reduced in accordance with the layer thickness control of the screen F, the fins 32 of the screen F are "closed", and the guide plate 45 is raised so that the sort air is directed upward.

The guide plate 45 is located above the rear end portion of the rear first shelf 50 of the primary conveyor 25.

Therefore, the pellets separated by the screen F can be guided to the primary conveyor 25, and the recovery efficiency can be improved.

The guide plate 45 is configured to have a vertical width substantially equal to the height position of the upper ends of the fins 32 of the screen F and substantially equal to the height position of the lower ends of the fins 32 of the final screen 23C in a side view.

Therefore, the separation air can be guided above the upper ends of the fins 32 of the screen F compared to the lower ends of the fins 32 of the end screen 23C, and the separation efficiency can be improved.

The fins 32 at the leading end of the final screen 23C are provided at a lower position than the fins 32 at the trailing end of the screen F.

Therefore, the fins 32 of the end screen 23C guide the separation air flowing below the screen F upward, and the separation performance can be improved.

(effects of the embodiment)

The utility model relates to an above-mentioned structure, the stalk (cereal pole) that is cut off is threshed by rotatory threshing cylinder 10 in threshing chamber 11, and the thing that is handled after threshing leaks down from threshing net 12 and falls to the transfer shelf portion 22 of the starting end portion of swing separation shelf 20 on, transfers sieve F from transferring shelf portion 22, selects separately through the air supply that comes from winnower 15 and the sieve F that carries out reciprocal wobbling swing separation shelf 20 in sorting chamber 17.

Since the rough separation net 30 is provided above the screen F of the swing separation shelf 20, the rough separation net 30 performs rough separation so that impurities such as stems and branches of mung beans do not fall onto the screen F, the impurities such as stems and branches are caught by the rough separation net 30 and move backward by the swing of the rough separation net 30 (the swing separation shelf 20), and pods of mung beans fall onto the screen F from between the rough separation nets 30 arranged side by side on the left and right, fall between the fins 32 of the screen F, and are collected by the primary conveyor 25.

Therefore, the coarse screen 30 suppresses the foreign matter from falling onto the screen F, thereby improving the sorting efficiency.

Since the front end of the rough screen 30 is positioned at the rear end of the transfer shelf portion 22 and the rear end of the rough screen 30 is positioned above the front end of the document sorter 24, the rough screen 30 covers the entire upper portion of the screen F in the front-rear direction when viewed from the side, and foreign matter is prevented from falling onto the screen F.

The coarse sorting net 30 is provided above the screen F, so that the dropping of the harvested (recovered) seeds and foreign matter other than pods is suppressed, and the dropping of the seeds and pods of mung beans is promoted, thereby improving the sorting treatment efficiency.

In the present embodiment, since the front end of the rough-sizing net 30 is positioned at the rear end of the transfer shelf portion 22 and the rear end of the rough-sizing net 30 is positioned above the front end of the document sorter 24, the rough-sizing net 30 covers the entire upper portion of the screen F in the front-rear direction in a side view, and foreign matter is prevented from falling onto the screen F, and the rough-sizing net 30 is opened above the document sorter 24, and pods (not threshed) that have not broken are collected into the secondary conveyor 26 and returned to the threshing chamber 11 by the secondary returning device 27 to be subjected to the threshing process again.

Thus, the discharging loss due to the scattering and discharging of the ungranulated pod outside the machine can be prevented.

In other words, since the rear part of the rough separation net 30 provided on the screen F is open at a rear side part of a part of the document collector 24, the document collector (the end screen 23C)24 is provided below the open part K, and the secondary chute 31 is provided below the document collector 24, the falling of the foreign matters is prevented by the rough separation net 30 above at the start end part of the document collector 24, the object to be processed including the pod which is not threshed is caused to fall through the open part K at the end side of the document collector 24, and the object to be processed and the foreign matters are separated by the document collector 24, so that the falling of the foreign matters into the secondary chute 31 is suppressed, and the secondary screen recovery efficiency and the secondary screen reprocessing efficiency can be improved.

Since the front screen 23A and the rear screen 23B are arranged in parallel in the front and rear of the screen F and at least the rear screen 23B is configured such that the inclination angle of the fins 32 is freely adjustable, the separation air is blown upward between the front screens 23A at a predetermined inclination angle of the fins 32 of the front screen 23A, the separation action of grains and inclusions is performed on the front half of the swing separation shelf 20, and the grains and inclusions are allowed to fall down to the primary conveyor 25 at an early stage, thereby reducing the loss.

Further, by changing the inclination angle of the rear screen 23B in accordance with conditions such as the amount of the object to be processed, the air volume of the sorting air between the fins 32 of the rear screen 23B can be adjusted, and sorting processing according to the sorting load can be performed.

Since the screen wire 35 is provided above the rough separation net 30 in the front-rear middle portion of the swing separation shelf 20, the screen wire 35 receives foreign matters falling onto the rough separation net 30, thereby improving the separation processing effect by the screen wire 35, promoting the entire separation, and suppressing the separation loss.

Since the fins 32 of the rear screen 23B are positioned lower than the fins 32 of the front screen 23A, an effect of blowing upward the separation air flowing from the front direction through the rear screen 23B can be expected, and separation accuracy and efficiency can be improved.

Further, if the screen line 35 is provided above the leading end portion of the rear screen 23B, the sorting air blows through the screen line 35 from below, and the sorting effect can be further improved.

Further, since the screen line 35 is positioned substantially above the primary conveyor 25, the grains sorted by the screen line 35 can be promoted to enter the primary conveyor 25, and the recovery efficiency can be improved.

Since the screen wire 35 is attached to the main body 36 side of the swing sorting shelf 20 for each coarse screen 30 from above the coarse screen 30, the screen wire 35 can also serve as a fixing member for the coarse screen 30 as well as a holding member for foreign matter before falling onto the coarse screen 30.

Further, since the screen line 35 is provided above the rough screen 30 at the rear in the front-rear direction of the oscillating sorting shelf 20, the separated foreign matters are easily discharged directly to the outside of the machine without falling onto the rough screen 30.

Further, the grains separated by the rear screen 35 are dropped from the lower straw shaker 24, caught by the secondary chute 31, and subjected to the collection process by the secondary conveyor 26, so that the sorting loss can be reduced.

Since the rear screen wire 35 provided above the rough separation net 30 behind the swing separation shelf 20 is inclined so as to be lower in front and higher in rear, the separated foreign matters are easily discharged directly to the outside of the machine without falling onto the rough separation net 30.

Further, the grains separated by the screen line 35 are dropped from the lower straw shaker (end screen 23C)24, caught by the secondary chute 31, and subjected to the collection processing in the secondary conveyor 26, so that the sorting loss can be reduced.

Since the end screen 23C is provided at the end portion of the swing sorting shelf 20 instead of the document jogger 24 and the guide plate 45 for adjusting the wind direction is provided between the leading end portion of the end screen 23C and the end portion of the screen F, the degree of upward blowing of the sorting wind near the guide plate 45 can be adjusted, the discharge of the pellets outside the machine can be prevented, and the recovery rate of the secondary conveyor 26 can be improved.

Since the guide plate 45 is rotatably attached to the swing sorting shelf 20 and the vertically intermediate portion of the guide plate 45 is rotatably attached to the connecting plate 46 that adjusts the inclination angle of the fins 32 of the screen F, the guide plate 45 is adjusted in the inclination angle in conjunction with the fins 32 of the screen F. When the screen F is closed, the guide plate 45 stands up so that the sort air is directed upward.

Further, when the flow rate is reduced in accordance with the layer thickness control of the screen F, the guide plate 45 stands up so that the sorting air is directed upward, and therefore, the discharge of the pellets outside the machine is prevented, and the recovery rate of the secondary conveyor 26 can be improved.

Since the guide plate 45 is positioned above the rear end portion of the rear first shelf 50 of the primary conveyor 25, the pellets separated by the screen F can be guided to the primary conveyor 25, and the recovery efficiency can be improved.

The guide plate 45 is configured to have a vertical width substantially equal to the height position of the upper ends of the fins 32 of the screen F and substantially equal to the height position of the lower ends of the fins 32 of the final screen 23C in a side view, and therefore, the separation air can be guided upward above the upper ends of the fins 32 of the screen F compared to the lower ends of the fins 32 of the final screen 23C, and the separation efficiency can be improved.

Since the fins 32 at the leading end portion of the final screen 23C are provided at a position lower than the fins 32 at the trailing end portion of the screen F, the fins 32 of the final screen 23C guide the separation air flowing below the screen F upward, and the separation performance can be improved.

Claims (4)

1. A threshing machine having:

a threshing chamber (11) having a threshing cylinder (10) for threshing the crop; and

a sorting chamber (17) disposed below the threshing chamber (11),

it is characterized in that the preparation method is characterized in that,

in the sorting chamber (17) there are: a winnower (15) which generates separation wind; and

a swing sorting shelf (20) which is reciprocally swung in the front-rear direction,

on the oscillating sorting shelf (20) there are:

a transfer shelf part (22) which receives the processed object falling from the threshing chamber (11) and transfers the processed object to the rear;

a 1 st sorting unit (F) disposed behind the transfer shelf unit (22) and configured by a plurality of 1 st sorting members arranged at intervals in the front-rear direction;

a 2 nd sorting unit (24) disposed behind the 1 st sorting unit (F) and configured by a plurality of 2 nd sorting members spaced apart from each other in the left-right direction; and

a sorting net (30) disposed above the 1 st sorting section (F),

the rear end of the sorting net (30) is located at the middle part of the 2 nd sorting part (24) in the front-rear direction.

2. The thresher of claim 1,

the thresher has a screen line (35) above the middle part of the separation net (30) in the front-rear direction.

3. A threshing machine according to claim 1 or 2,

the 1 st sorting unit (F) has a front screen (23A) and a rear screen (23B), the rear screen (23B) being disposed behind the front screen (23A),

the rear screen (23B) has a sorting member whose inclination angle can be adjusted.

4. The thresher of claim 3,

the rear screen (23B) is disposed at a position lower than the front screen (23A).