JP2001245526A - Sieve case structure for threshing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sieve case structure enabling the minimal aperture of a weight-sensing chaff sieve to be set easily in consideration of the kind and/or wet condition of a crop to be harvested. SOLUTION: This sieve case structure has such a shame that, a chaff sieve 17 equipped on a sieve case 6 is connected with the group of chaff lip plates 17A collocated longitudinally at specified intervals so as to be interlockingly swingable about the transverse axes P3 set on the respective upper ends so as to be controllable in the aperture of the chaff sieve 4, an aperture control spring 31 is provided to function to elastically urge the group of chaff lip plates 17A toward closing-side so as to change the aperture according to the weight of a to-be-treated object on the chaff sieve 17, and a control lever 35 for setting the minimal aperture of the chaff sieve 17 is furnished on a steering section F.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chaff sheave configured to be adjustable in degree of opening, and elastically biases a group of chaff flip plates toward a closed side so that the degree of opening changes according to the weight of the processed material on the chaff sheave. The present invention relates to a sheave case structure of a threshing device in which an opening degree adjusting spring is provided and a chaff sheave is configured to be of a weight sensing type.

[0002]

2. Description of the Related Art Conventionally, in a sheave case structure of a threshing apparatus as described above, for example, as disclosed in Japanese Patent Application Laid-Open No. H11-75512, an operating lever disposed on the left lateral outer side of a sheave case. By operating, the minimum opening of the chaff sheave can be set in consideration of the type of crop to be harvested and the degree of wetness.

[0003]

However, according to the above-mentioned prior art, in order to change the setting of the minimum opening of the chaff sheave, it is necessary to get down from the boarding operation section and go to the left side of the threshing apparatus, and to change the makeup cover on the left side. After removing the throat, it is necessary to remove the inspection lid that closes the inspection port formed on the left side wall of the threshing device, so the minimum opening of the chaff sheave is set in consideration of the type of crop to be harvested and the degree of wetting. Was annoying.

An object of the present invention is to make it possible to easily set the minimum opening of a weight-sensitive chaff sieve in consideration of the type of crop to be harvested, the degree of wetting, and the like.

[0005]

[Means for Solving the Problems] [Structure] In order to achieve the above object, in the invention according to claim 1 of the present invention, a chaff sheave mounted on a sheave case is arranged at predetermined intervals in the front-rear direction. The group of chaff flip plates provided is connected so as to be swingable around the horizontal axis set at each upper end so as to be able to adjust the opening degree of the chaff sheave, and the opening degree of the processing object on the chaff sheave is adjusted. An opening adjustment spring that elastically urges the chaff flip plate group toward the closing side so as to change in accordance with the weight is provided, and an operation lever for setting the minimum opening of the chaff sheave is provided in the boarding operation unit.

According to the first aspect of the present invention, the larger the amount of processed material that accumulates on the chaff sheave and the heavier the weight of the processed material that acts on the chaff sheave due to the fact that the crop to be harvested is slightly wet, the greater the amount of the processed material. Since the weight of the group of chaff flip plates lowers and swings to the opening side against the urging force of the opening adjustment spring, the degree of opening of the chaff sheave is increased in a state substantially proportional to the weight of the processed material on the chaff sheave. On the other hand, the smaller the weight of the processed material that acts on the chaff sheave due to the reduced amount of processed material deposited on the chaff sheave and the fact that the harvested crop tends to be dry, the more the urging force of the opening adjustment spring As a result, the group of chaff flip plates rises and swings to the closing side, so that the chaff sheave is opened in a state substantially proportional to the weight of the processed material on the chaff sheave. So it can be reduced.

[0007] That is, despite the simple configuration in which only the opening adjustment spring for elastically biasing the chaff sheave toward the closing side is provided, the amount of processed material deposited on the chaff sheave increases and the crop to be harvested tends to be wet. When it is difficult for the grains on the chaff sheave to leak from the chaff sheave, the opening degree of the chaff sheave can be automatically increased in a state substantially proportional to the weight of the processed material on the chaff sheave at that time, Since it is possible to promote the leakage of the kernel having a high specific gravity from the chaff sheave toward the first material recovery unit for recovering the kernel, the sorting efficiency can be improved. or,
If the amount of material to be deposited on the chaff sheave is reduced or the crops to be harvested tend to dry out, the straw on the chaff sheave is likely to leak from the chaff sheave, and the treatment on the chaff sheave at that time The degree of opening of the chaff sheave can be automatically reduced in a state that is substantially proportional to the weight of the material, and the leakage of the straw with a low specific gravity from the chaff sheave toward the No. 1 material recovery part can be suppressed. Thus, the sorting accuracy can be improved.

Further, since the minimum opening of the chaff sheave can be set in consideration of the type of crop to be harvested and the degree of wetness by operating the operation lever, for example, the type of crop to be harvested can be a stem like a rice plant. In the case where it is supple and hard to generate broken straw during threshing treatment, most of the processed material deposited on the chaff sheave becomes grains, so that the processed material on the chaff sheave easily leaks from the chaff sheave. By setting the minimum opening of the chaff sheave to a large value, it is possible to promote the leakage of the grain from the chaff sheave toward the first product recovery unit side, and it is possible to further improve the sorting efficiency . Conversely, if the type of crop to be harvested is not supple in the stem like wheat, and it is easy to produce straw when threshing,
Since the processed material deposited on the chaff sheave contains many broken straws, etc., by setting the minimum opening of the chaff sheave small so that the processed material on the chaff sheave does not easily leak from the chaff sheave In addition, it is possible to suppress the leakage of broken straws and the like from the chaff sheave toward the first object recovery unit side, and it is possible to further improve the sorting accuracy.

Further, for example, when the crop to be harvested is wet and the processed material on the chaff sieve is hard to leak from the chaff sieve, the minimum of the chaff sieve is set so that the processed material easily leaks from the chaff sieve. By setting the opening to a large value, it is possible to suppress the occurrence of clogging of the processed material in the chaff sieve, and to further improve the sorting efficiency. If the processed material of the chaff sheave easily leaks from the chaff sheave, the minimum opening of the chaff sheave is set small so that the processed material on the chaff sheave hardly leaks from the chaff sheave. It is possible to suppress the leakage from the chaff sheave of the included straw and the like toward the No. 1 item recovery section side, and further improve the sorting accuracy. To become.

[0010] In addition, since the operating lever for setting the minimum opening of the chaff sheave is provided in the boarding operation section, the operating lever is provided on the left lateral outer side of the sheave case. Getting off from the boarding operation unit and going to the left side of the threshing device, which was done when changing the minimum opening of the chaff sheave in consideration of
There is no need to perform such troublesome work as removing the left-hand makeup cover and inspection cover from the left-side wall of the threshing device.

Furthermore, since the setting of the minimum opening of the chaff sheave can be changed while being in the boarding operation section, the mowing work is temporarily interrupted during the work traveling, for example, at the time of headland turning, so that the chaff sheave can be changed. If the amount of material to be treated is significantly reduced, the minimum opening of the chaff sheave can be temporarily reduced in consideration of this, so that a temporary reduction in sorting accuracy due to headland turning, etc. is also avoided. Will be able to do it.

[Effect] Therefore, the opening degree adjusting spring for elastically urging the chaff sheave toward the closing side is provided, and the operation lever for setting the minimum opening degree of the chaff sheave is simply provided in the boarding operation section. In addition to automatically adjusting the opening of the chaff sheave in accordance with the amount of material deposited on the chaff sheave and the degree of wetting of the crop, the minimum opening of the chaff sheave in consideration of the type of crop to be harvested and the degree of wetting, etc. Can be easily set while in the on-board driving section, so that sorting efficiency and sorting accuracy can be effectively improved, and operability when setting the minimum opening of the chaff sheave can be improved. became.

[Structure] According to a second aspect of the present invention, in the first aspect of the present invention, the operation lever is provided with an air volume adjusting plate for adjusting a selection air volume from Karamin to the sheave case. It is linked so that the smaller the minimum opening degree of the chaff sheave is set, the smaller the amount of the selected air becomes.

According to the second aspect of the present invention, for example, when the type of crop to be harvested is a processed product deposited on a chaff sieve such as wheat, and a lot of broken straws are included, When the crop to be harvested is dry and the processed material on the chaff sieve is likely to leak from the chaff sieve, in order to improve the sorting accuracy,
By operating the operation lever and reducing the minimum opening of the chaff sheave so that the processed material on the chaff sheave is unlikely to leak from the chaff sheave, the air volume is adjusted so that the sorting air flow from Karamin to the sheave case decreases proportionally Influence of sorting wind passing through the sheave case on the leakage of heavier kernels of the treated material, which is difficult to leak by reducing the minimum opening of the chaff sieve, because the plates are operated in conjunction with each other And effectively reduce the leakage of broken straw, etc. with a low specific gravity while minimizing as much as possible, so that it can be reduced to the extent that a suitable wind power can be obtained according to the setting of the minimum opening of the chaff sheave at that time .

Conversely, for example, when the type of crop to be harvested is such that most of the processed material deposited on the chaff sieve like rice is grain, or when the harvested crop is wet and the processed material on the chaff sieve is wet. In order to improve the sorting efficiency in the case where it is difficult to leak from the chaff sheave, the minimum opening of the chaff sheave is controlled by operating the operation lever so that the processed material on the chaff sheave can easily leak from the chaff sheave. When the air flow rate is increased, the air flow rate adjustment plate is operated in conjunction with the air flow from Karino to the sieve case in proportion to the air flow.Therefore, the minimum opening of the chaff sheave must be increased for the wind that passes through the sieve case. Effectively suppresses the leakage of lightly cut straw, etc. without adversely affecting the leakage of heavier specific grains from the processed material that has become easier to leak I went, it is possible to enhance a suitable extent that wind can be obtained in accordance with the setting of the minimum opening of the chaff sieve at that time.

[Effect] Therefore, it is easy to adjust the selection air volume appropriately in consideration of the type of crop to be harvested and the degree of wetness, etc. by setting the minimum opening of the chaff sheave and a single operation while staying in the boarding operation unit. In order to improve the sorting efficiency and the sorting accuracy more effectively, it is possible to further improve the operability when setting the minimum opening of the chaff sheave and adjusting the sorting air volume. became.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall side view of a combine. This combine makes it possible to move up and down a mowing part C at a front part of a traveling body B traveling by a pair of right and left crawler traveling units A. In connection with the traveling machine B, a threshing device D and a grain tank E are mounted on the traveling body B, and a boarding operation section F is formed at a position ahead of the grain tank E.

As shown in FIG. 2, the threshing apparatus D is a threshing unit D1 for threshing the ears of the culm culm which is pinched and conveyed in a horizontal position by a feed chain 1 arranged on the left side thereof. A sorting unit D2 that performs a sorting process on the processed material from the threshing unit D1, and a collecting unit D that collects the first and second products among the processed materials selected by the sorting unit D2.
3, etc.

The threshing section D1 is formed on the handling cylinder 2 which is driven to rotate around the horizontal axis P1 in the front-rear direction, the receiving net 3 provided on the lower side of the handling cylinder 2, and the rear of the receiving net 3. The handling cylinder 2 separates and separates grains from the harvested culm which is clamped and conveyed by the feed chain 1 to form a single grain. The sediment is allowed to leak from the receiving net 3 to the sorting unit D2, and kernels and broken straw not leaked from the receiving net 3 are sorted from the dust outlet 4 to the sorting unit D2.
To be discharged.

The sorting section D2 is a sheave disposed below the receiving net 3 in a state where the left and right sides on the front side are suspended and supported by a support arm 5 which can swing back and forth around a horizontal axis P2 facing left and right. The sheave case 6 is constituted by a case 6, a karano 7 disposed below the front of the sheave case 6, and the like. The sheave case 6 is oscillated by the operation of an eccentric drive mechanism 8 disposed at the rear of the case 6. As a result, the processed material from the threshing unit D1 is subjected to sieving and sorting, and the mining machine 7 supplies the sorting wind toward the sieve case 6 so that the processed material sieved and sorted by the sieve case 6 is removed. And wind power sorting. By these sorting operations, the processed material from the threshing unit D1 is converted into a grain as the first product, a mixture of the grain as the second product and the straw, and a straw as the third product. And so on.

The collecting section D3 includes a first article collecting section 9 formed below the front of the sheave case 6, a second article collecting section 10 formed below the rear of the sheave case 6, and the like. I have. The first product recovery unit 9 recovers the first product among the processed products sorted by the separation unit D2, and transfers the recovered first product to the bottom of the first screw disposed left and right. By 11, it is configured to be conveyed toward a lifting screw 12 (see FIG. 1) connected to the right end thereof. The second product recovery unit 10 recovers the second product among the processed products sorted by the sorting unit D2, and transfers the recovered second product to the bottom of the second screw disposed to the left and right. By 13, it is configured to be conveyed toward a second reduction screw 14 connected to the right end thereof.

The lifting screw 12 lifts the first product conveyed by the first screw 11 and supplies it from above to a grain tank E arranged side by side on the right side of the threshing device D. It is configured as follows. Also, the second reduction screw 14
The second screw 13 is configured to lift the second product conveyed by the second screw 13 and return it to the sheave case 6.

As shown in FIG. 2, the sheave case 6 includes a first Glen pan 1 provided at an upper front end of the sheave case 6.
5. A plurality of first sieve lines 16 extending rearward in a state of being connected to the rear end of the first grain pan 15, and arranged in a state extending rearward from below the first sieve line 16. A first chaff sheave (chaff sheave according to the claims) 17, a second Glen pan 18 disposed above the rear half of the first chaff Sheave 17, a first straw rack 19 extending rearward from the second Glen pan 18; Plural second sieve lines 20, first
The second provided in a state of being connected to the rear end of the chaff sheave 17
The second straw rack 22 arranged in a state of being connected to the rear end of the second chaff sheave 21, and the third Glen pan 2 arranged below the front of the first chaff sheave 16.
3, and a Glen sheave 24 arranged in a state of being connected to the rear end of the third Glen pan 23, etc., and supplied to the front part of the first chaff sheave 17 through the first air passage 25. A first opening 6A through which the sorting wind from the nozzle 7 flows toward the first sieve line 16, and a second air passage 26
And a second opening 6 </ b> B through which the sorting wind supplied from the Karamin 7 is supplied to the first chaff sheave 17.

The first Glen pan 15 receives the processed material leaked from the first half of the receiving net 3 and transports the processed material rearward while sorting the specific gravity difference. Multiple first sieve lines 1
6 is a method of roughly sorting out the grains having a high specific gravity from among the processed material leaked from the front and rear intermediate portions of the receiving net 3 and the processed material transferred by the first Glen pan 15 and causing the remaining processed material to leak. Is transported backward. The first chaff sheave 17 coarsely sorts grains and the like out of the processed material leaked from the rear part of the receiving net 3 and the processed material passed through the plurality of first sieve lines 16 and leaks the remaining processed material. Is transported backward. 1st straw rack 19
The sifting means screens and separates grains and the like from the processed material discharged from the dust outlet 4, and transfers the remaining processed material backward. 2nd Glen bread 1
Reference numeral 8 is such that the processed material leaking from the first straw rack 19 is transported rearward while being sorted by specific gravity. The plurality of second sieve lines 20 coarsely sort grains and the like out of the processed material transferred by the second Glen pan 18 and the processed material passed through the first straw rack 19, while allowing them to leak,
The remaining processed material is transported rearward and upward. The second chaff sieve 21 roughly sorts grains and the like from the processed material transferred by the first chief sieve 17 and the processed material leaked from the plurality of second sieve lines 20, and collects the second product 1
0, and the remaining processed material is transported rearward. 2nd straw rack 22
Is used to sieve and sort out grains and the like from the processed material transferred by the plurality of second sieve lines 20 and the second chaff sheaves 21.
In addition to leaking to the item collection unit 10, the remaining straw with a small specific gravity is transported backward and discharged outside the machine. The third Glen pan 23 transports the processed material leaked from the front of the first chaff sheave 17 rearward while sorting the specific gravity difference. The grain sieve 24 selectively sorts the kernels from the processed material transported by the third Glen pan 23 and the processed material leaked from the rear side of the first chaff sheave 17 and leaks the kernels to the first product recovery unit 9, while remaining the remaining grains. The processed material is transported backward and supplied to the second product recovery unit 10.

Reference numeral 27 shown in FIG. 2 denotes an outflow prevention plate for preventing the processed material leaked from the plurality of second sieve lines 20 from flowing out of the first opening 6A, and reference numeral 28 denotes a first chaff sheave. 17 is a perforated plate that allows the flow of the sorting wind toward 17 and prevents the processed material leaked from the front end of the first chaff sheave 17 from flowing out of the second opening 6B.

As shown in FIGS. 3 to 6, the first chaff sheave 17 includes a group of chaff flip plates 17A arranged side by side at predetermined intervals in the front-rear direction, around a horizontal axis P3 set at each upper end thereof. The first connecting member 29 is pivotally connected to the left and right side walls 6C via the first connecting member 29, and their lower ends are connected to the second connecting member 30.
The opening can be adjusted by interlocking connection at. Further, the first chaff sheave 17 is provided with a tension spring 31 for elastically biasing the group of the chaff flip plates 17A to the closing side.
As the weight of the processed material acting on the first chaff sheave 17 increases due to the increase in the amount of the processed material deposited on the top and the fact that the crop to be harvested is slightly wet, the group of the chaff flip plates 17A is attached to the extension spring 31 by the weight. Since the first chief sheave 17 swings downward to the opening side against the force, the opening degree of the first chief sheave 17 can be increased in a state substantially proportional to the weight of the processed material on the first chief sheave 17, and conversely. ,
The smaller the weight of the processed material that acts on the first chaff sheave 17 due to the reduced amount of the processed material deposited on the first chaff sheave 17 and the fact that the crop to be harvested tends to be dry, the smaller the amount of the processed material acting on the first chaff sheave 17, and the more the tension force of the tension spring 31 causes the chaff flip plate 17A.
Since the group rises and swings toward the closing side, the opening degree of the first chief sheave 17 can be reduced in a state in which it is substantially proportional to the weight of the processed material on the first chief sheave 17.

That is, the tension spring 31 is an opening degree adjusting spring for configuring the first chief sheave 17 in a weight sensing type in which the opening degree changes according to the weight of the processed material on the first chief sheave 17. With a simple configuration in which only the opening adjustment spring 31 is provided on the first chief sheave 17 that is adjustable in degree,
When it is difficult for the processed material to leak from the first chaff sheave 17 due to an increased amount of the processed material deposited on the first chaff sheave 17 or the processed material being slightly wet, the weight of the processed material accompanying the processing is reduced. The increase in the opening degree of the first chaff sheave 17 can be increased, and the third chaff sieve 17 which is a selective sorting unit from the first chaff sheave 17 of the grain having a high specific gravity among the processed products can be obtained.
Leakage toward the Glen pan 23 and the Glen sheave 24 can be promoted, and conversely, the first amount of material to be deposited on the first chaff sheave 17 decreases and the In the case where the processed material easily leaks from the chaff sheave 17, the opening degree of the first chaff sheave 17 can be reduced due to the decrease in the weight of the processed material accompanying the processed material. 3rd Glen bread 23 which is the selection section from 1st chaff sieve 17
And the leakage toward the grain sheave 24 can be suppressed, so that the sorting efficiency and the sorting accuracy can be improved while simplifying the configuration and reducing the manufacturing cost.

In addition, by directly adjusting the opening of the first chief sheave 17 with the weight of the processed material on the first chief sheave 17, the opening of the first chief sheave 17 is adjusted on the first chief sheave 17 at that time. Since it can be performed promptly according to the state of the processed material, the first chief sieve 17 can be used.
The difference between the actual opening of the first chief sheave 17 and the optimal opening of the first chief sheave 17 in accordance with the state of the workpiece on the first chief sheave 17 can be made very small.

In the second connecting member 30, a pin 32 connected to the left end of the free end of the predetermined chaflip plate 17A has a left end portion extending from the second connecting member 30 to the left outside. The thing of the length is adopted. On the other hand, the left wall 6C of the sheave case 6 is formed with a long hole 6a that allows the movement of the pin 32 in accordance with the opening / closing operation of the first chief sheave 17. The long hole 6a is formed in an arc shape centering on the horizontal axis P3 which is a swing fulcrum of the chaflip plate 17A on which the long pin 32 is mounted.
2, the first chief sheave 17 has the limit minimum opening (substantially fully closed state), and when the pin 32 contacts the lower end thereof, the first chief sheave 17 has the limit maximum opening (full open state). ), The movement of the pin 32 accompanying the opening / closing operation of the first chief sheave 17 is restricted. On the lateral outer side of the left side wall 6C of the sheave case 6,
An operation arm 33 for setting the minimum opening of the first chaff sheave 17 is provided.

A predetermined position on the left side wall 6C of the sheave case 6 between the support shaft 34 of the first connecting member 29 for swingably supporting the predetermined chaflip plate 17A around the horizontal axis P3 and the elongated hole 6a. The operation arm 33 is connected to the horizontal axis P4.
A fulcrum pin 6b that protrudes around the swinging operation is provided. An elongated hole 33a is formed at a position on the pivot point of the operation arm 33 to allow the movement of the pin 32 in accordance with the opening / closing operation of the first chief sheave 17. A support piece 33 bent at the upper part of the operation arm 33 at the pivot point side
An opening adjustment spring 31 is stretched over A and a left pin 32 of a predetermined chaflip plate 17A.
That is, the operation arm 33 allows the movement of the pin 32 in accordance with the opening / closing operation of the first chief sheave 17, and the horizontal axis P
When the swing operation is performed around 4, the minimum opening of the first chief sheave 17 is changed, and the opening adjustment range of the first chief sheave 17 depending on the weight of the processed material is changed. Incidentally, when the operation arm 33 is swung toward the front upper side, the minimum opening degree of the first chaff sheave 17 can be reduced, and when the operation arm 33 is swung toward the rear lower side, the first chaff sheave 17 is swung. 17 can be increased.

The free end of the operating arm 33 has a boarding operation section F
An operation lever 35 arranged to be swingable back and forth around the horizontal axis P5 is linked via an operation wire 36. When the operation lever 35 is operated to swing forward, the operation arm 33 is moved.
The operation arm 33 can be swung toward the lower rear side by the action of the tension spring 37 that urges the arm toward the rear lower side, and the minimum opening of the first chaff sheave 17 can be increased. Conversely, when the operation lever 35 is pivoted rearward, the operation arm 33 can be pivoted forward and upward against the urging force of the tension spring 37, and the first chief sheave 17 can be opened minimum. The degree can be reduced.

As shown in FIG. 3, the operation lever 35
A guide plate 38 for guiding the operation lever 35 in the front-rear direction
Is provided with an engagement protrusion 35a which can be selectively engaged with a plurality of engagement recesses 38a formed at a predetermined pitch. When this engagement protrusion 35a is engaged with any one of the engagement recesses 38a, Operating arm 33 in a swinging posture corresponding to the operating position.
The first chaff sheave 1
7 can be set, and the degree of overlap between the long hole 6a of the sheave case 6 and the long hole 33a of the operation arm 33 corresponding to the operation position appears, and the predetermined channel is set. Since the moving range of the left pin 32 in the flip plate 17A is restricted, the opening adjustment range of the first chaff sheave 17 can be set by the weight of the processed material.

An exhaust port 39A through which a part of the sorting wind generated by the rotation of the Karamin 7 flows out is formed in the Karamin cover section 39 which covers the front of the Karamin 7, and the exhaust port 39A can be opened and closed freely. An opening / closing cover 40 is provided so as to be capable of opening and closing around a horizontal axis P6 facing left and right. The opening / closing cover 40 is linked to the operating lever 35 via an operating wire 41, and when the operating lever 35 is swung forward, a tension spring 42 that urges the opening / closing cover 40 toward the exhaust port 39A. , The opening / closing cover 40 can be swung to the side that closes the exhaust port 39A, so that the amount of sorting air flowing from the Karamin 7 to the sheave case 6 can be increased, and conversely, the operation lever 35 can be moved rearward. When the swing operation is performed, the exhaust port 3 is pressed against the urging force of the tension spring 42.
The opening / closing cover 40 can be swung to the side where 9A is opened, so that the amount of sorting air flowing from the Karamin 7 to the sheave case 6 can be reduced.

In other words, the opening / closing cover 40 is an air volume adjusting plate for adjusting the amount of air to be sorted from the carving 7 to the sheave case 6. The first chief sheave 17 and the air volume adjusting plate 40 are connected to each other by operating the operation lever 35. 17 is linked so that the smaller the minimum opening degree of 17 is, the smaller the selected air volume is.

With the above configuration, for example, when the type of crop to be harvested is such as rice, which is unlikely to produce broken straws during threshing, most of the processed material deposited on the first chaff sheave 17 is removed. When the crop is to be harvested and the treated material on the first chaff sieve 17 is less likely to leak from the first chaff sieve 17 because the crop to be harvested is slightly wet, the treated material in the first chaff sieve 17 When the minimum opening of the first chief sheave 17 is set to a large value by operating the operation lever 35 so that the processed material on the first chief sheave 17 easily leaks from the first chief sheave 17 because there is a risk of clogging, the interlocking operation is performed. By the swinging operation of the air volume adjusting plate 40, the air volume to be selected from the Karamin 7 to the sheave case 6 is increased, and the air volume to be passed through the first chaff sheave 17 is increased. From this, it is possible to effectively suppress the leakage of the grain having a high specific gravity from the first chaff sheave 17 while promoting the leakage of the kernel having a high specific gravity from the first chaff sheave 17. I have.

Conversely, when the type of crop to be harvested is such as wheat, which tends to produce broken straws during threshing, a large number of broken straws and the like are deposited on the first chaff sieve 17. When the crop to be harvested tends to be dry and the processed material on the first chaff sieve 17 is likely to leak from the first chaff sieve 17, many broken straws and the like Since the processed material on the first chief sieve 17 is liable to leak from the first chief sieve 17 together with the kernel, the operating lever 35 is operated so that the processed material on the first chief sieve 17 is hard to leak from the first chief sieve 17 and the minimum opening of the first chief sieve 17 is performed. When the degree is set to a small degree, the swinging operation of the air volume adjusting plate 40 in conjunction therewith reduces the amount of sorted air flowing from the Karin 7 to the sheave case 6 and reduces the amount of air that passes through the first chaff sheave 17. Since the wind is in a weakened state, the influence of the sorted wind on the leakage of the kernel having a high specific gravity in the treated material which has become difficult to leak due to the opening adjustment is minimized as much as possible. While promoting the leakage from the chaff sheave 17, the synergistic effect of the minimum opening degree and the selection air volume set at this time effectively suppresses the leakage from the first chaff sheave 17 such as a straw with a small specific gravity. I can do it.

In short, the operating lever 3 in the boarding operation section F
By operating 5, the setting of the minimum opening and the opening adjustment range of the first chaff sheave 17 and the setting of the sorting air volume in consideration of the type of crop to be harvested and the degree of wetting can be easily performed. It is possible to more effectively improve the sorting efficiency and the sorting accuracy.

Further, since the setting of the minimum opening of the first chaff sheave 17 can be changed while staying in the boarding operation section F, the mowing work is temporarily interrupted during the work traveling, for example, at the time of headland turning. When the amount of the processed material on the first chief sheave 17 is greatly reduced due to this, the minimum opening of the first chief sheave 17 can be temporarily reduced in consideration of this, so that the temporary opening caused by headland turning and the like can be made. In addition, it is possible to avoid a drop in the sorting accuracy.

Further, as described above, since the first chief sheave 17 is urged to the side where the minimum opening is increased by the tension spring 37, the operation wire 36 for linking the operation arm 33 and the operation lever 35 is provided. When the operation wire 36 is extended, the operation wire 36 is operated to the side where the minimum opening degree is increased by the action of the tension spring 37 to promote the leakage of the processing object. When the tension spring 37 is configured to reduce the minimum opening of the first chief sheave 17, the processed material greatly exceeding an appropriate amount on the first chief sheave 17 due to the extension of the operation wire 36 may occur. Thus, it is possible to prevent a reduction in sorting efficiency due to stagnation and a clogging of the processed material on the first chaff sheave 17 beforehand.

On the other hand, the air volume adjusting plate 40 is
2, the exhaust port 39 </ b> A is urged to close the exhaust port 39 </ b> A. Therefore, when the operation wire 41 that links the operation lever 35 and the air volume adjustment plate 40 is extended, the tension spring 42
The swinging operation is performed to the side that closes the exhaust port 39A by the action of to increase the amount of sorting air flowing from the Karamin 7 to the sheave case 6 so as to suppress the leakage of the straw with a low specific gravity from the first chaff sheave 17 or the like. When the operation wire 41 is extended, the tension spring 4
When the air flow adjusting plate 40 is configured to swing the air flow adjusting plate 40 to the open side of the exhaust port 39A, the selection air flow from the Karamin 7 to the sheave case 6 due to the extension of the operation wire 42 may be increased. The number of straws with reduced specific gravity is the first
It is possible to avoid a drop in the sorting accuracy due to the fact that it easily leaks from the chaff sheave 17 or the like.

As shown in FIGS. 3 to 5, on the left outer side of the sheave case 6, a predetermined chaflip plate 17A is connected via a left pin 32 and protrudes from a left side wall 6C of the sheave case 6. A predetermined chafflip plate 1 is supported by the fulcrum pin 6b so as to be swingable about the horizontal axis P4.
A counter weight 43 extending in a direction opposite to the extension direction of the 7A is provided. By the action of the counter weight 43, a light operating force due to a change in the weight of the processed material on the first chief sheave 17 is provided. When the sheave case 6 is driven to swing, the first chief sheave 17 whose opening is adjusted can be prevented from opening and closing by its own weight.

[Other Embodiments] Hereinafter, other embodiments of the present invention will be listed. The operation lever 35 may be configured to be able to be frictionally held at an arbitrary operation position, or may be configured to be able to be held by an operation of a detent mechanism. The air volume adjusting plate 40 may not be linked to the operation lever 35.

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine.

FIG. 2 is a longitudinal side view of the threshing apparatus.

FIG. 3 is an association diagram showing an interlocking operation structure of a first chaff sheave and an air volume adjusting plate by an operation lever.

FIG. 4 is a developed longitudinal sectional side view showing a configuration of a first chaff sheave.

FIG. 5 is a cross-sectional plan view of a main part showing a configuration of a first chaff sheave.

FIG. 6 is a longitudinal sectional front view of a main part showing a configuration of a first chaff sheave.

[Explanation of symbols]

 6 Sheave case 7 Karamin 17 Chaf sheave 17A Cha flip plate 31 Opening adjustment spring 35 Operation lever 40 Air flow adjustment plate F Boarding operation part P3 Horizontal axis core

Claims (2)

[Claims] 1. A group of chaff flip plates, which are arranged side by side at predetermined intervals in the front-rear direction, are connected to a chaff sheave provided in a sheave case in such a manner that they can swing freely around a horizontal axis set at each upper end. An opening adjustment spring configured to adjust the opening of the chaff sheave and to elastically urge the chaff flip plate group toward the closing side so that the opening changes according to the weight of the processed material on the chaff sheave. And a sheave case structure of a threshing device in which an operation lever for setting the minimum opening of the chaff sheave is provided in the boarding operation section. 2. The operation lever is provided with an air flow adjusting plate for adjusting the air flow rate from Karamin to the sheave case such that the smaller the minimum opening of the chaff sheave, the smaller the air flow rate. A sheave case structure for the threshing apparatus according to claim 1.