JP2001245525A - Sieve case structure for threshing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sieve case structure designed to more effectively improving the sorting efficiency or accuracy through making a simple improvement on a counterweight. SOLUTION: This sieve case structure has such a scheme that, an aperture- controllable chaff sieve 17 is furnished with an aperture control spring 31 functioning to elastically urging the group of chaff lip plates 17A toward closing- side so as to change the aperture of the chaff sieve 17 according to the weight of a to-be-treated object thereon, the chaff lip plates 17A are furnished with a counterweight 35 functioning to hinder the own weight swing of the chaff lip plates 17A accompanying the swing of a sieve case 6, the counterweight 35 is designed so as to align nearly in a straight line the respective junctions P5 to the chaff lip plates 17A, support P4 and center of gravity P6 thereof, and the resultant straight line L is set to be in an inclined posture nearly along the swing locus K of a support arm 5 swingably supporting the front portion of the sieve case 6 when the aperture of the chaff sieve 17 is large.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chaff sheave provided in a sheave case, wherein a group of chaff flip plates arranged side by side at predetermined intervals in the front-rear direction is interlockingly oscillated around a horizontal fulcrum set at each upper end. The chief sheaves are configured to be freely connected to each other so that the opening of the chief sheave can be adjusted, and the chief shelves are elastically biased toward the closing side so that the opening varies according to the weight of the processed material on the chief sheave. The present invention relates to a sheave case structure of a threshing device provided with a degree adjusting spring.

[0002]

2. Description of the Related Art Conventionally, in the above-described sheave case structure of a threshing apparatus, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Unexamined Patent Application Publication No. 8-108, a counterweight for imparting the same swinging power to the chaff flip plate group in a direction opposite to the swinging direction due to their own weights at the time of swinging drive of the chaff sheave is provided with a predetermined weight. The sheave case is driven to swing downward from the horizontal fulcrum, which is the swing fulcrum of the chaff flip plate, in a direction opposite to the direction in which the chaff flip plate extends, so as to fit within the height of the side wall of the sheave case. Occasionally, the chaff sheave chaflip plate group is prevented from opening and closing by its own weight.

[0003]

However, according to the above-mentioned prior art, since the counterweight extends downward, the swing trajectory of the support arm that swingably supports the front portion of the sheave case can be obtained. The extension direction of the counterweight is substantially orthogonal to the counterweight itself, and the counterweight itself, which suppresses the opening / closing operation of the group of chaflip plates due to its own weight, moves around the lateral fulcrum with the swing drive of the sheave case. Due to the vibration, the inconvenience of the opening / closing operation of the chaflip plate group due to the vibration of the counterweight has been caused. As a result, the degree of opening of the chaff sheave in accordance with the weight of the processed material on the chaff sheave becomes difficult to accurately appear, which causes a decrease in the sorting efficiency and the sorting accuracy. There was room for improvement for more effective improvement.

An object of the present invention is to improve the sorting efficiency and the sorting accuracy more effectively by adding a simple improvement to the counterweight.

[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 chaflip plates to be installed is connected so as to swing freely around the horizontal fulcrum set at each upper end,
While configuring the chaff sheave to be adjustable in opening,
In the sheave case structure of a threshing device provided with an opening adjustment spring that elastically urges the chaff flip plate group toward the closing side so that the opening varies according to the weight of the processed material on the chaff sheave, the chaff flip plate A counter weight that is connected so as to extend in a direction opposite to the extending direction to prevent the self-flunging of the group of chaflip plates caused by the swing of the sheave case; The weight is formed such that each of the connection points with the chaflip plate, the fulcrum, and the center of gravity are arranged substantially on a straight line, and a line connecting the connection points, the fulcrum, and the center of gravity is
When the opening degree of the chaff sheave is large, it is set so as to be inclined substantially along the swing trajectory of the support arm that swingably supports the front portion of the sheave case.

According to the first aspect of the present invention, when the sheave case is driven to swing, the counter weight prevents the opening and closing operation of the group of chaflip plates due to its own weight due to the swing of the sheave case. When the opening degree of the chaff sheave is large, in other words, when a large amount of processed material is supplied on the chaff sheave by the normal cutting and traveling, the cereal stalks cut by the cutting unit are continuously transported to the threshing device. The support arm that supports the front part of the case so that it can swing freely has an inclined posture that is approximately along the swing trajectory, which effectively shakes itself around the horizontal fulcrum with the sheave case swing drive. Will be suppressed. In other words, the opening and closing operation of the group of chaff flip plates due to their own weight can be prevented, and the opening and closing operation of the group of chaff flip plates due to the vibration of the counter weight can be effectively suppressed. The degree can be more accurately expressed, so that the sorting efficiency and the sorting accuracy can be improved more effectively.

[Effect] Accordingly, by improving the shape and the mounting posture of the counter weight in consideration of the swing direction of the sheave case and the opening state of the chaff sheave, it is possible to further improve the sorting efficiency and the sorting accuracy. You can now work effectively.

According to a second aspect of the present invention, in the first aspect of the present invention, the distance from the fulcrum to the connection point on the counter weight is set to be equal to the horizontal direction on the chaff flip plate. The distance was set to be shorter than the distance from the fulcrum to the connection point.

According to the second aspect of the present invention, the distance from the fulcrum of the counter weight to the connection point with the chaflip plate is equal to the distance from the upper horizontal support point of the chaff flip plate to the connection point with the counter weight. Since the opening and closing movement (vibration) of the self-flip plate group during the swing driving of the sheave case is less likely to be transmitted to the counter weight by the distance shorter than the distance, the effect of suppressing the self-weight opening and closing of the chaflip plate group by the counter weight is improved. As a result, the opening degree of the chaff sheave in accordance with the weight of the processed material on the chaff sheave can be more accurately expressed, so that the sorting efficiency and the sorting accuracy can be more effectively improved.

Further, since the total length of the counterweight extending upward from the connection point with the chaflip plate in the direction opposite to the direction in which the chaflip plate extends can be shortened.
The counter weight is connected to the point of connection with the
The fulcrum and the center of gravity can be accommodated within the height of the side wall of the sheave case while being formed such that each of the fulcrum and the center of gravity is substantially aligned.

[Effects] Accordingly, the sorting efficiency and the sorting accuracy can be more effectively improved while saving space in mounting the counterweight.

[0012]

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, a threshing unit D is a threshing unit D1 for threshing the ears of a harvested grain 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 handle cylinder 2 which is driven to rotate around the horizontal axis P1 in the front-rear direction, the receiving net 3 provided below the handling cylinder 2, and the rear side 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 that have 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 is constituted by 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 the first product from above to a grain tank E juxtaposed on the right side of the threshing apparatus 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 FIGS. 2 and 3, the sheave case 6 extends rearward in a state where the sheave case 6 is connected to a first Glen pan 15 provided at an upper front end of the sheave case 6 and a rear end of the first Glen pan 15. The plurality of first sieve lines 16, and the first chaff sheave (chaff sheave according to the claims) 1 arranged so as to extend rearward from below the first sieve line 16.
7, a second grain pan 18 disposed above the rear half of the first chaff sheave 17, a first straw rack 19 extending rearward from the second grain pan 18, a plurality of second sieve lines 20, and a first chaff sheave. 17, the second chaff sheave 21 arranged in a state of being connected to the rear end of the second straw chunk, and the second straw rack 2 provided in a state of being connected to the rear end of the second chaff sheave 21
2. The third deployed below the front of the first chaff sheave 16
It is configured by a Glen pan 23, a Glen sheave 24 arranged in a state of being connected to the rear end of the third Glen pan 23, and the like, and is supplied to a front portion of the first chaff sheave 17 through a first air passage 25. A first opening 6A through which the sorting wind from Karino 7 flows toward the first sieve line 16,
The second opening 6 </ b> B through which the sorting wind from the Karamin 7 supplied through the second air passage 26 flows toward the first chaff sheave 17.
Are formed.

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 selecting 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 FIGS. 2 and 3 is an outflow prevention plate for preventing the processed material leaked from the plurality of second sieve lines 20 from flowing out from the first opening 6A. First
This is a perforated plate that prevents the processed material leaked from the front end of the first chaff sheave 17 from flowing out from the second opening 6B while allowing the flow of the sorting wind toward the chaff sheave 17.

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 core 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.

In other words, the tension spring 31 is an opening adjustment spring for configuring the first chief sheave 17 in a weight-sensitive manner in which the opening changes in accordance with 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, the pin 32 connected to the left end of the free end of the predetermined chaflip plate 17 A 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 lever 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 lever 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 swing fulcrum side of the operation lever 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 portion of the operation lever 33 on the side of the swing fulcrum
An opening adjustment spring 31 is stretched over A and a left pin 32 of a predetermined chaflip plate 17A.
The operation lever 33 is fixedly held at a desired operation position on the left side wall 6C of the sheave case 6 by engaging with an engagement hole 33b formed at a free end of the operation lever 33 which can be elastically deformed laterally outward. The six engaging projections 6c are provided at a predetermined pitch.

With this configuration, the engagement hole 3 of the operation lever 33
When the engagement 3b is engaged with any of the engagement projections 6c, the overlapping state of the long hole 6a of the sheave case 6 and the long hole 33a of the operation lever 33 corresponding to the operation position appears, and a predetermined channel is formed. When the range of movement of the left pin 32 in the flip plate 17A is restricted, and the engagement holes 33b of the operation lever 33 are engaged with the three engagement projections 6c on the front upper side, the front upper side is reduced. The support piece 33A of the operation lever 33 and the predetermined chaflip plate 17A
Since the distance from the left pin 32 in FIG. 3 increases and the urging force of the opening adjustment spring 31 becomes stronger, the minimum opening of the first chaff sheave 17 in consideration of the type of crop to be harvested and the degree of wetting, The opening degree adjustment range of the first chaff sheave 17 depending on the weight of the processed material and the degree of difficulty in the operation of adjusting the opening degree of the first chaff sheave 17 based on the weight of the processed material can be set.

Incidentally, when the kind of crop to be harvested is such that rice is hardly cut during threshing like rice, and most of the processed material deposited on the first chaff sieve 17 is grain, If the processed product on the first chief sieve 17 is less likely to leak from the first chief sieve 17 and may become clogged because the crop to be wet is slightly wet, the operating lever 33 is operated to minimize the size of the first chief sieve 17. By setting so that the opening degree becomes large and the opening degree adjustment operation of the first chief sieve 17 by the weight of the processed material is easily performed, the fine sorting unit from the first chief sieve 17 of the kernel having a high specific gravity is used. It is possible to promote leakage toward a certain third grain pan 23 or a grain sieve 24,
Since the clogging of the processed material in the first chaff sheave 17 can be avoided, the sorting efficiency can be more effectively improved.

Conversely, when the type of crop to be harvested is wheat, such as wheat, cut straws are apt to occur during threshing, and the processed material deposited on the first chaff sieve 17 contains many cut straws. If the harvested crop is a little dry and many crop straws and the like are likely to leak from the first chaff sieve 17 together with the grains, the operation lever 33 is operated. By setting the minimum opening degree of the first chief sheave 17 to be small and making it difficult for the opening degree adjustment operation of the first chief sheave 17 to be performed by the weight of the processed material, it is possible to reduce the likelihood of cutting straw having a small specific gravity. Leakage from one chaff sheave 17 to the third glen pan 23 or glen sieve 24, which is a selective sorting section, can be suppressed, so that sorting accuracy can be more effectively improved. It has become way.

The minimum opening of the first chaff sheave 17 is
The engagement hole 33b of the operation lever 33 is connected to the engagement protrusion 6 on the front upper side.
b can be set to a smaller opening degree so as to engage with b.
Further, the opening can be set to be larger as the engagement hole 33b of the operation lever 33 is engaged with the engagement projection 6b on the lower rear side.

As shown in FIGS. 3 to 5, on the left outside of the sheave case 6, it is connected to a predetermined chaflip plate 17A via a left pin 32 and protrudes from a left 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 35 is provided, which extends in the direction opposite to the direction in which the sheave case 6 extends, and prevents the self-flip swing of the group of chaflip plates 17A caused by the swing of the sheave case 6.

The counterweight 35 is formed such that the pin 32 serving as a connection point P5 with the predetermined chaflip plate 17A, the fulcrum pin 6b serving as a fulcrum P4, and the center of gravity P6 are aligned. A line L connecting the connection point P5, the fulcrum P4, and the center of gravity P6 is
When the opening of the chief sheave 17 is large, it is set so as to be inclined substantially along the swing trajectory K of the support arm 5 that swingably supports the front portion of the sheave case 6 (see FIG. 3). .

With this configuration, the counter weight 35
When the sheave case 6 is driven to swing, the opening / closing operation of the group of chaff flip plates 17A due to its own weight due to the swing of the sheave case 6 is prevented, and when the opening degree of the first chaff sheave 17 is large, that is, during normal mowing travel. When a large amount of processed material is supplied onto the first chaff sheave 17 by continuously transporting the grain stalks cut by the cutting unit C to the threshing apparatus D, the front part of the sheave case 6 can swing freely. By setting the supporting arm 5 to be supported in an inclined posture substantially along the swing locus K, it becomes possible to effectively suppress itself from vibrating around the fulcrum P4 due to the swing drive of the sheave case 6. And thereby the chaflip plate 17
The opening and closing operation of the group A due to its own weight can be prevented, and the chaflip plate 17 caused by the vibration of the counterweight 35 can be prevented.
Since the opening / closing operation of the group A can be effectively suppressed, the first
The degree of opening of the first chaff sheave 17 in accordance with the weight of the processed material on the chaff sheave 17 can be more accurately expressed, thereby improving the sorting efficiency and the sorting accuracy more effectively.

The distance R1 from the fulcrum P4 to the connection point P5 of the counter weight 35 is the same as that of the chaflip plate 17A.
Is set so as to be approximately half of the distance R2 from the horizontal fulcrum P3 to the connection point P5, and the self-weight opening / closing movement (vibration) of the group of chaflip plates 17A during the swing driving of the sheave case 6 is correspondingly increased. Since it is difficult for the weight to be transmitted to the weight 35, the effect of the counterweight 35 for suppressing the opening and closing of the self-weight of the group of the flip plates 17A is improved,
As a result, the degree of opening of the first chaff sheave 17 according to the weight of the processed material on the first chaff sheave 17 can be more accurately expressed, so that the sorting efficiency and the sorting accuracy can be more effectively improved. ing.

Further, the total length of the counterweight 35 extending upward from the connection point P5 with the predetermined chaflip plate 17A in the direction opposite to the direction in which the chaflip plate 17A extends can be shortened. Counter weight 35,
The connection point P5 with the chaflip plate 17A, the fulcrum P4,
The center of gravity P6 and the center of gravity P6 are formed so as to be substantially aligned with each other, but can be accommodated within the height of the side wall 6C of the sheave case 6.

Reference numeral 35a shown in FIG. 4 and FIG. 5 indicates that a predetermined chafflip plate 17A having a different fulcrum position and a counter weight 35 are interlocked with each other as the opening of the first chaff sheave 17 is changed. It is a long hole formed along the line L at a connection portion of the counter weight 35 with a predetermined chaflip plate 17A so as to allow displacement of the pin 32 connecting them to the counter weight 35 when moving. .

As shown in FIG. 3, the operation lever 33 and each engaging projection 6c face an inspection port 36 formed on the left side wall of the threshing device D. The operation of changing the engagement position of the operation lever 33 with each of the engagement protrusions 6c for setting the minimum opening of the first chaff sheave 17 according to the type and the degree of wetting can be easily performed.

[Other Embodiments] Hereinafter, other embodiments of the present invention will be listed. As the counter weight 35, its connection point P5,
As the line L connecting the fulcrum P4 and the center of gravity P6 becomes larger, the opening degree of the first chief sheave 17 increases, and the inclination posture substantially follows the swing locus K of the support arm 5 that swingably supports the front part of the sheave case 6. The posture may be set so that The distance R1 from the fulcrum P4 to the connection point P5 in the counter weight 35 can be variously changed according to the height of the side wall 6C of the sheave case 6, the processing area of the first chief sheave 17, and the like. The distance R1 from P4 to the connection point P5 may be set to be about ／ of the distance R2 from the lateral support point P3 of the chaff flip plate 17A to the connection point P5.

[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 a longitudinal sectional side view of a main part showing a relationship between a swing locus of a support arm and a posture of a counterweight.

FIG. 4 is a developed longitudinal side view showing a configuration of a first chaff sheave and a mounting structure of a counterweight.

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

FIG. 6 is a longitudinal sectional front view of a main part showing a configuration of a first chaff sheave and a mounting structure of a counter weight.

[Explanation of symbols]

Reference Signs List 5 Support arm 6 Sheave case 17 Chaff sheave 17A Chaflip plate 31 Opening adjustment spring 35 Counterweight K Swing locus L Line (line connecting a connection point, a fulcrum and the center of gravity) P3 Lateral fulcrum P4 Supporting point P5 Connection point P6 Center of gravity R1 Distance (Distance from fulcrum to connection point in counterweight) R2 distance (distance from lateral fulcrum on the chaflip plate to connection point)

Claims (2)

[Claims] 1. A chaff sheave provided in a sheave case is connected to a group of chaff flip plates arranged side by side at a predetermined interval in a front-rear direction so as to be swingable interlockingly around a lateral fulcrum set at each upper end. The chaff sheave is configured to be adjustable in opening, and an opening adjustment spring is provided to elastically urge the chaff flip plate group toward the closing side so that the opening varies according to the weight of the processed material on the chaff sheave. A sheave case structure of the threshing device, wherein the chaff flip plate is connected to the chaff flip plate so as to extend in a direction opposite to the direction in which the chaff flip plate extends. A counterweight for preventing the weight from oscillating is provided, and the counterweight is formed such that each of the connection point, the fulcrum, and the center of gravity with the chaflip plate is substantially aligned. And,
When the opening of the chaff sheave is large, the line connecting the connection point, the fulcrum, and the center of gravity has an inclined posture substantially along the swing trajectory of the support arm that swingably supports the front part of the sheave case. Sheave case structure of threshing equipment set as follows. 2. The counter weight according to claim 1, wherein a distance from the fulcrum to the connection point in the counterweight is set shorter than a distance from the lateral fulcrum to the connection point on the chaff flip plate. Sheave case structure for threshing equipment.