CN114532053B

CN114532053B - Soybean combine harvester

Info

Publication number: CN114532053B
Application number: CN202210375897.0A
Authority: CN
Inventors: 金诚谦; 倪有亮; 王廷恩; 陈满; 袁文胜; 刘政; 徐金山; 杨腾祥; 张光跃; 钱震杰; 冯玉岗; 刘岗微
Original assignee: Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
Current assignee: Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-12-09
Anticipated expiration: 2042-04-11
Also published as: CN114532053A

Abstract

The invention relates to a soybean combine harvester, and belongs to the technical field of agricultural machinery. The machine comprises a walking chassis, a header, a threshing and separating device, a grain tank, a cleaning device and a seed conveying auger seed cleaning mechanism; the bottom of a conveying auger outer cover of the seed conveying auger seed cleaning mechanism is hinged with an openable circular hole arc-shaped sieve plate; the hinged end of the round hole arc-shaped sieve plate is fixedly connected with one end of the fixed block, the other end of the fixed block is hinged with one end of the driving connecting rod, the other end of the driving connecting rod is hinged with one end of the connecting lever, the other end of the connecting lever is hinged on a hinged fulcrum shaft supported below the other side of the round hole arc-shaped sieve plate, the hinged end of the hinged fulcrum shaft is fixedly connected with one end of the crank lever, and the other end of the crank lever is connected with the adjusting handle. The soybean grain harvester can realize the opening of the circular arc sieve plate, so that soybean grains accumulated in the outer cover of the conveying auger and the grain conveying auger can be cleaned and released, and the harvesting loss is further reduced.

Description

Soybean combine harvester

Technical Field

The invention relates to a harvester, in particular to a soybean combine harvester, and belongs to the technical field of agricultural machinery.

Background

The main problems of the existing mechanized harvesting of soybeans are large loss, high breakage rate and serious clay (commonly called mud flower face) on the surfaces of bean grains. Therefore, chinese patent documents with application numbers 03260510.2, 201510505965.0 and 201910670669.4 respectively disclose innovations on soybean combine harvesters from various angles, but the applicant finds that retention and aggregation phenomena of soybean seeds are common in the conveying link after threshing in the prior art in continuous practice. Research and analysis show that the soybean grain residue in the threshing conveying system not only increases the loss after harvesting, but also influences the smooth conveying of the threshed grains in serious cases, and as a result, vicious circle is caused, so that the crushing rate after harvesting is high.

Secondly, the cleaning system in the existing soybean combine harvester is difficult to be suitable for the soybean harvesting of different varieties, planting modes and working conditions, for example, the threshing cleaning test bed disclosed in the Chinese patent document with the application number of 201910051798.5 adopts a motor to realize the rotation speed adjustment of a fan, but the adjustment of the inclination angle of a vibrating screen is not considered, so that the cleaning efficiency and the quality of the soybean harvesting are improved, and the cleaning loss is reduced.

In addition, the threshing and separating device of the soybean combine harvester in the prior art has poor adaptability, and when the feeding amount is different and even the water content is different, the problems of incomplete threshing, roller blockage and the like are inevitable, and the high-quality and high-efficiency soybean harvesting cannot be ensured.

Disclosure of Invention

The primary objects of the present invention are: aiming at the defects existing in the prior art, the soybean combine harvester which properly solves the problem of soybean seed residue is provided through structural improvement, so that the harvesting loss and the damage rate are more effectively reduced, and the harvesting efficiency and the quality of soybeans are ensured.

Further objects of the invention are: the soybean combine harvester with the cleaning device suitable for different varieties, planting modes and operation conditions is provided, and the harvesting loss is further reduced by improving the cleaning efficiency and quality of soybean harvesting.

Further objects of the invention are: provides a soybean combine harvester with a threshing and separating device with ideal adaptability, thereby further ensuring high-quality and high-efficiency soybean harvesting.

In order to achieve the above primary purpose, the invention discloses a basic technical scheme of a soybean combine harvester: the threshing and separating device comprises a walking chassis with a driving control platform on one side, a header with a reel positioned in front of the walking chassis, a threshing and separating device positioned on the walking chassis, a grain tank positioned at the rear of the driving control platform and on one side of the threshing and separating device, a cleaning device positioned below the threshing and separating device, and a seed conveying auger seed cleaning mechanism connected below the cleaning device;

the output end of the header is connected with the input end of the threshing and separating device through a middle conveying groove, and the output end of the seed conveying auger seed cleaning mechanism is connected with the inlet of the grain tank through a seed elevator;

the seed cleaning mechanism of the seed conveying auger comprises a conveying auger outer cover with a groove-shaped cross section extending towards the conveying direction, and an openable circular arc-shaped sieve plate is hinged at the bottom of the conveying auger outer cover; the hinge end of the round hole arc-shaped sieve plate is fixedly connected with one end of the fixed block, the other end of the fixed block is hinged with one end of the driving connecting rod, the other end of the driving connecting rod is hinged with one end of the connecting lever, the other end of the connecting lever is hinged on a hinge fulcrum shaft supported below the other side of the round hole arc-shaped sieve plate, the hinge fulcrum end of the hinge fulcrum shaft is fixedly connected with one end of the crank lever, and the other end of the crank lever is connected with the adjusting handle.

When the soybean harvester of the invention is harvesting, soybean plants cut by the header are shifted into the header by the reel, and then are conveyed to the threshing separation device by the middle conveying groove, after threshing operation, soybean seeds and sundries fall on the screen surface of the cleaning device, the cleaned sundries and straws are separated out of the harvester, and the soybean seeds fall into the horizontal seed conveying auger and are conveyed to the grain tank by the seed elevator. In the process, when soybean seeds retained at the seed conveying auger seed cleaning mechanism need to be cleaned, the adjusting handle is lifted, the connecting lever is driven by the crank lever, and the circular hole arc-shaped sieve plate is driven by the connecting rod and the fixing block to rotate around the hinged end of the circular hole arc-shaped sieve plate, so that the circular hole arc-shaped sieve plate can be opened, soybean seeds accumulated in the conveying auger outer cover and the seed conveying auger can be cleaned and released, and the harvesting loss is further reduced; then the adjusting handle is operated to reset, so that the circular hole arc-shaped sieve plate can continue to work normally after being closed and reset.

The invention is further perfected in that the cleaning device is provided with a front round hole sieve and a rear tail sieve, and a horizontal seed conveying auger seed cleaning mechanism and a sundry residue conveying auger seed cleaning mechanism are arranged below the round hole sieve and the tail sieve;

the miscellaneous residue conveying auger seed cleaning mechanism comprises a groove-shaped cross-section conveying auger cover extending towards the conveying direction, and an openable circular hole arc-shaped sieve is hinged at the bottom of the conveying auger cover; the hinged end of the circular hole arc-shaped sieve is fixedly connected with one end of a fixed connecting rod, the other end of the fixed connecting rod is hinged with one end of an actuating connecting rod, the other end of the actuating connecting rod is hinged with one end of an intermediate lever, the other end of the intermediate lever is hinged to a hinged shaft supported below the other side of the circular hole arc-shaped sieve, and the hinged end of the hinged shaft is connected with a regulation and control handle.

Further, the output end of the impurity conveying auger seed cleaning mechanism is connected with the input end of the threshing and separating device through a re-threshing elevator.

Therefore, the part of the unpicked pods separated by the tail sieve after the threshing operation are conveyed to the threshing and separating device again for secondary threshing through the impurity conveying auger and the re-threshing elevator, and the harvesting loss is further reduced. In the process, when soybean seeds staying in the impurity conveying auger seed cleaning mechanism are found, the circular hole arc-shaped sieve can be opened only by lifting the regulating and controlling handle, so that the residual soybean seeds are released and gathered, and the harvesting loss is further reduced; and then the regulation and control handle is reset, so that the normal work can be recovered.

The invention not only reasonably arranges the seed cleaning mechanism, but also is convenient to operate and control, can timely clean the residue of the soybean seeds in the threshing and conveying system and ensure the smooth conveying, thereby reducing the harvesting loss and effectively reducing the crushing rate.

In order to achieve a further object, the cleaning device comprises a front grid screen and a rear grid screen which are arranged on the upper part of a screen frame; the front and rear grid sieves respectively comprise a frame which is formed by an upward inclined front plate, side plates at two sides and a rear plate, and sieve sheets which are arranged in the frame and distributed at intervals; the side plate is provided with an upper row of hinged holes which are uniformly distributed at intervals and a lower row of abdicating holes which are correspondingly distributed at intervals; hinge pins extend from the upper end side and the lower end side of the sieve sheet respectively; the hinge pins on the two sides of the upper end are respectively hinged with the corresponding hinge mounting holes, and the hinge pins on the two sides of the lower end respectively extend out of the corresponding abdicating holes and then are hinged with the corresponding holes of the outer connecting rod, so that a multiple parallel four-bar mechanism is formed.

Furthermore, the upper end of the first sieve sheet is fixedly connected with the upper end hole of the adjusting handle, and the middle hole of the adjusting handle is movably connected with the lower end of the first sieve sheet; the pull-down hole of the adjusting handle extends to the driver control console through a pull wire.

Therefore, the driving control platform can be controlled as required to realize the regulation and control of the inclination angle of the sieve sheet so as to be suitable for soybean harvesting and cleaning of various practical conditions, and the harvesting loss caused by cleaning is further reduced while the cleaning efficiency and the cleaning quality are improved.

In order to achieve a further purpose, the threshing and separating device comprises a threshing chamber frame with an upper cover, a left circular hole concave sieve and a right circular hole concave sieve which are oppositely combined, a threshing cylinder supported on the threshing chamber frame and a transmission system;

the lower part of the cover plate of the upper cover is hinged with the middle hinged support holes of a group of guide plates which are distributed along the axial direction of the threshing cylinder at intervals through a hinged strip; one end of each guide plate is hinged through a connecting rod to form a parallel connecting rod mechanism.

Furthermore, the guide plate at one end is fixedly connected with one end of the guide adjusting rod through a hinge fulcrum shaft fixedly connected with a hinge hole in the middle of the guide plate and a connecting block; the cover plate is fixedly provided with a scale plate for limiting the gears of the diversion adjusting rod; the scale plate is provided with stop grooves with upward openings and distributed at intervals, and two sides and the upper part of the scale plate are semi-surrounded by the limiting frame.

Therefore, in the threshing operation process, the angle of the guide plate can be regulated and controlled according to the increase of the harvesting feeding amount or the moisture content of plants, so that the soybean combine harvester has better adaptability, and the harvesting loss caused by blockage is avoided.

Drawings

The invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of an embodiment of the present invention with its side cover open.

Fig. 2 is a schematic bottom perspective view of the embodiment of fig. 1 with the reel removed.

Fig. 3 is a perspective view of the embodiment of fig. 1 with the header and chassis removed.

Fig. 4 is a schematic perspective structure of the cleaning device of the embodiment of fig. 1.

Fig. 5 is a perspective view of the rear grid screen of fig. 4.

Fig. 6 is a schematic perspective exploded view of the rear grid screen of fig. 4.

Fig. 7 is a schematic perspective view of the seed conveying auger seed cleaning mechanism of the embodiment of fig. 1.

Fig. 8 is a simplified view of the seed conveying auger seed cleaning mechanism of the embodiment of fig. 1.

Fig. 9 is a schematic perspective view of the opened seed cleaning mechanism of the seed conveying auger in the embodiment of fig. 1.

Fig. 10 is a schematic perspective view of the miscellaneous conveying auger seed cleaning mechanism of the embodiment of fig. 1.

FIG. 11 is a simplified diagram of a mechanism for cleaning seeds of the trash conveying auger of the embodiment of FIG. 1.

FIG. 12 is a perspective view of the opening state of the miscellaneous conveying auger seed cleaning mechanism of the embodiment of FIG. 1.

Fig. 13 is a schematic perspective view of the engagement between the tailing conveyor seed cleaning mechanism 10 and the re-threshing elevator in the embodiment of fig. 1.

Fig. 14 is a schematic perspective view of the threshing and separating device of fig. 1.

Fig. 15 is a schematic perspective view of an upper cover of the threshing and separating device in the embodiment of fig. 1.

Fig. 16 is a schematic view of the structure in perspective from the direction a of fig. 15 (i.e., a top view of fig. 15 after being turned by 90 °).

Fig. 17 is a schematic perspective view of a baffle adjusting mechanism of the threshing-separating device in the embodiment of fig. 1.

Detailed Description

Example one

The soybean combine harvester of the embodiment is basically configured as shown in fig. 1, fig. 2 and fig. 3, a header 3 with a reel 1 is mounted at the front part of a walking chassis D, a driving console 8 is positioned on the walking chassis at one side of the header 3, a threshing and separating device 6 is positioned on the walking chassis at the rear part of the header 3, and a grain tank 7 is positioned at the rear part of the driving console 8 and one side of the threshing and separating device. The threshing and separating device 6 is provided with a threshing cylinder 5, and a cleaning device 4 is arranged below the threshing and separating device. Fig. 2 and 3 show a kernel transporting auger at 11 and a tailing transporting auger at 12.

The specific structure of the cleaning device 4 is shown in figure 4, and comprises a front grid screen 4-10-2 and a rear grid screen 4-10-5 which are arranged at the upper part of a screen frame 4-10-1, a round hole screen 4-10-3 positioned at the front lower part and a tail screen 10-4 positioned at the rear upper part of the round hole screen 4-10-3.

The rear grid screen 4-10-5 has a specific structure as shown in fig. 5 and 6, and comprises a frame mainly defined by an inclined front plate A1, side plates A4 at both sides and a rear plate A6, and screen plates A5 arranged in the frame at intervals. The side plate A4 is provided with hinged holes A4.1 which are uniformly distributed at intervals in the upper row and abdication holes A4.2 which are correspondingly distributed at intervals in the lower row; the upper and lower ends of each sieve sheet A5 extend out of a hinge pin A5.1 respectively, so that the two sides of the upper end are hinged with the corresponding hinge holes A4.1 respectively, and the two sides of the lower end extend out of the corresponding abdicating holes A4.2 respectively and then are hinged with the corresponding holes of the outer connecting rod A3, thereby forming a multiple parallel four-bar mechanism. The upper end of the first sieve sheet is fixedly connected with the upper end hole A2.1 of the rear adjusting handle A2, and the middle hole A2.2 of the rear adjusting handle A2 is movably connected with the lower end of the sieve sheet. The lower pull-down hole A2.3 of the rear adjusting handle A2 extends to the driving console 8 through a pull wire and a pull wire fixing frame. Therefore, the sieve sheet can be adjusted to rotate synchronously around the upper hinge point on the driving console, so that the inclination angle is adjusted and controlled, and when the harvesting loss is too large and the impurity content is not high, the inclination angle of the sieve sheet is adjusted to be small; when the loss is not large and the impurity content is high, the inclination angle of the sieve sheet is adjusted to be large, so that the soybean cleaning machine is suitable for soybean harvesting cleaning of different varieties, planting modes and operation working conditions, the cleaning efficiency and quality of soybean harvesting can be improved, and the cleaning loss can be reduced. The structure of the front grid screen 4-10-2 is similar to that of the rear grid screen 4-10-5, and detailed description is not provided.

The lower parts of the front round hole sieve 4-10-3 and the rear tail sieve 4-10-4 in the cleaning device 4 are respectively provided with a grain collecting frame 4-10-6 fixed on the sieve frame 4-10-1, and the lower parts of the two grain collecting frames 4-10-6 are respectively provided with a horizontal seed conveying screw conveyor seed cleaning mechanism 9 and a residual conveying screw conveyor seed cleaning mechanism 10.

The output end of the header 3 is connected with the input end of the threshing and separating device 6 through a middle conveying trough D3, the output end of the seed conveying auger seed cleaning mechanism 9 is connected with the inlet of the grain tank 7 through a seed lifting conveyor D1 (in the embodiment, a chain conveyor for a spoon produced by Linyixin Hui agricultural machinery Co., ltd.), and the output end of the impurity conveying auger seed cleaning mechanism 10 is connected with the input end of the threshing and separating device 6 through a re-threshing and lifting conveyor D3.

The specific structure of the seed cleaning mechanism 9 of the seed conveying auger is shown in fig. 7 and 8, and comprises a conveying auger outer cover 9-1 with a groove-shaped cross section extending towards the conveying direction, and an openable circular hole arc-shaped sieve plate 9-2 hinged to the bottom of the conveying auger outer cover; the hinged end of the round hole arc-shaped sieve plate 9-2 is fixedly connected with one end of a fixed block 9-3, the other end of the fixed block 9-3 is hinged with one end of a driving connecting rod 9-4, the other end of the driving connecting rod 9-4 is hinged with one end of a connecting lever 9-5, the other end of the connecting lever 9-5 is hinged on a hinged fulcrum shaft 9-8 supported below the other side of the round hole arc-shaped sieve plate 9-3, the hinged end of the hinged fulcrum shaft 9-8 is fixedly connected with one end of a crank lever 9-6, and the other end of the crank lever 9-6 is connected with an adjusting handle 9-7. When soybean seeds staying at the seed conveying auger seed cleaning mechanism are required to be cleaned, the adjusting handle is controlled, the circular hole arc-shaped sieve plate can be opened, so that the accumulated residual soybean seeds are cleaned and released as shown in fig. 9, the harvesting loss is further effectively reduced, and the normal work can be continued by resetting the hands.

The detailed structure of the miscellaneous transporting auger seed cleaning mechanism 10 is shown in fig. 10 and fig. 11, and comprises a transporting auger cover 10-1 with a groove-shaped cross section extending towards the transporting direction, an openable round hole arc-shaped sieve 10-2 is hinged at the bottom of the transporting auger cover, the hinged end of the round hole arc-shaped sieve 10-2 is fixedly connected with one end of a fixed connecting rod 10-3, the other end of the fixed connecting rod 10-2 is hinged with one end of an actuating connecting rod 10-4, the other end of the actuating connecting rod 10-4 is hinged with one end of an intermediate lever 10-5, the other end of the intermediate lever 10-6 is hinged on a hinged shaft 10-8 supported below the other side of the round hole arc-shaped sieve 10-2, and the hinged end of the hinged shaft 10-8 is connected with a regulating handle 10-7.

As shown in fig. 13 and with reference to fig. 1, the output end of the trash conveying auger 12 in the trash conveying auger seed cleaning mechanism 10 is connected to the input end of the threshing and separating device through a re-threshing elevator D2 (in this embodiment, a scraper conveyor produced by linyi xin hui agricultural machinery limited company) so that the part of the beans separated by the tail sieve after threshing operation without threshing is conveyed to the re-threshing elevator by the trash conveying auger and returned to the threshing and separating device for secondary threshing, thereby sufficiently reducing the harvest loss.

In addition, the threshing and separating device 6 of the present embodiment includes a threshing chamber frame 6-5 with an upper cover 6-1, a left circular hole concave sieve 6-2 and a right circular hole concave sieve 6-4 which are oppositely arranged, a threshing cylinder 6-3 supported on the threshing chamber frame 6-5, and a belt wheel transmission system 6-6, as shown in fig. 14. Considering that for a certain threshing chamber space of the shedding and separating device, when the harvesting feeding amount is increased due to the high and large varieties of soybeans, the improvement of the harvesting speed and the like in the harvesting process, if the diversion control cannot be carried out, the stalks are difficult to be discharged in time, the internal blockage is easily caused, and the fault is caused, so the improvement is needed.

As shown in figures 15 to 17, the lower part of the cover plate 6-1-1 of the upper cover 6-1 is hinged with a group of middle hinge holes of the guide plates 6-1-7 which are distributed at intervals along the axial direction of the flexible threshing cylinder 6-3 through the hinge strips 6-1-6. One end of each guide plate 6-1-7 is hinged through a connecting rod 6-1-8 to form a parallel connecting rod mechanism. The guide plate 6-1-7 at one end is fixedly connected with one end of the guide adjusting rod 6-1-3 through a hinge fulcrum shaft fixedly connected with a hinge hole in the middle of the guide plate and a connecting block 6-1-5. The cover plate 6-1-1 of the upper cover 6-1 is fixedly provided with a scale plate 6-1-2 for limiting the gear of the diversion adjusting rod 6-1-3. The scale plate 6-1-2 is provided with stop grooves which are opened upwards and distributed at intervals, and two sides and the upper part of the scale plate are semi-surrounded by the limit frames 6-1-4. The flow guide adjusting rod 6-1-3 is made of a metal lath with the thickness matched with the width of the gear groove, and the end, adjacent to the scale plate, of the flow guide adjusting rod is formed by twisting a horizontal right angle at the end fixedly connected with the connecting block. Thus, when the threshing and separating device works, soybean plants are fed into the threshing chamber from the front end of the threshing cylinder, threshing is carried out under the action of the threshing cylinder and the concave plate sieve, and when the harvest feeding amount is increased or the water content of the plants is larger, the angle of the guide plate is properly adjusted and increased, so that the movement efficiency and the trafficability of the crop flow are improved; when the harvest feeding amount is small and the plant water content is low, the angle of the guide plate is properly adjusted and reduced. When the guide plate is adjusted, the rotation of one guide plate drives other guide plates to synchronously rotate, and the adjustment of the integral angles of all the guide plates is realized.

When the harvester of the embodiment is used for harvesting, soybean plants cut by the cutter are poked into the header through the reel, conveyed to the middle conveying groove through the feeding auger of the header and conveyed to the threshing and separating device. After threshing operation by a flexible low-loss threshing cylinder, soybean grains and sundries fall on a screen surface of a cleaning device, most of cleaned sundries and straws are separated, the soybean grains fall into a grain conveying auger, and partial residual sundries and unpurified pods enter a sundries conveying auger. The soybean seeds are conveyed to the grain tank through the vertical seed elevator, and the bean pods with impurities and unpurified are conveyed to the front section of the roller again through the vertical re-threshing elevator for secondary threshing.

Because many places are improved and designed, experiments show that compared with the prior art, the soybean combine harvester of the embodiment has the following remarkable advantages:

1. on the basis of the cleaning device which is reasonably arranged on the front round hole sieve and the rear tail sieve, the seed grain conveying auger seed cleaning mechanism and the impurity conveying auger seed cleaning mechanism which are convenient to control are correspondingly equipped, so that the soybean seed grain residue in two threshing conveying systems can be timely removed, the conveying is smooth, the harvesting loss is reduced, and the crushing rate is effectively reduced.

2. The part of the unpinned bean pods separated by the threshing operation tail sieve are conveyed to the threshing and separating device again through the impurity conveying auger and the re-threshing elevator for secondary threshing, so that the harvesting loss is further reduced.

3. The inclination angle of the screen pieces of the rear grid screen can be changed, so that the rotating speed of the fan and the rear grid screen can be adjusted as required, the soybean harvester is suitable for harvesting and cleaning soybeans of different varieties, planting modes and operation conditions, the cleaning efficiency and quality of soybean harvesting are obviously improved, and the cleaning loss is reduced.

4. The inclination angle of each guide plate relative to the threshing cylinder can be conveniently and synchronously adjusted through the guide adjusting rod according to different harvesting operation conditions such as large feeding amount, the efficient matching harvesting operation is realized, the fault is obviously reduced, the difficult problem that the large feeding amount is easy to block is solved, and the loss of the unpurified rate and the soybean carried in the stalks can be effectively reduced.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. A soybean combine harvester is characterized in that: comprises a traveling chassis with a driving console (8) on one side, a header (3) with a reel (1) positioned at the front part of the traveling chassis, a threshing and separating device (6) positioned on the traveling chassis, a grain tank (7) positioned at the rear part of the driving console and one side of the threshing and separating device, a cleaning device (4) positioned under the threshing and separating device (6), and a grain conveying auger seed cleaning mechanism (9) connected under the cleaning device;

the output end of the header is connected with the input end of the threshing and separating device through a middle conveying groove, and the output end of the seed conveying auger seed cleaning mechanism (9) is connected with the inlet of the grain tank through a seed elevator;

the seed cleaning mechanism (9) of the seed conveying auger comprises a conveying auger outer cover (9-1) with a groove-shaped cross section extending towards the conveying direction, and the bottom of the conveying auger outer cover is hinged with an openable circular hole arc-shaped sieve plate (9-2); the hinged end of the round hole arc-shaped sieve plate is fixedly connected with one end of a fixed block (9-3), the other end of the fixed block is hinged with one end of a driving connecting rod (9-4), the other end of the driving connecting rod is hinged with one end of a connecting lever (9-5), the other end of the connecting lever is hinged on a hinged fulcrum shaft (9-8) supported below the other side of the round hole arc-shaped sieve plate, the hinged end of the hinged fulcrum shaft is fixedly connected with one end of a crank lever (9-6), and the other end of the crank lever is connected with an adjusting handle (9-7).

2. The soybean combine harvester of claim 1, wherein: the cleaning device (4) is provided with a round hole screen (4-10-3) in front and a tail screen (4-10-4) behind, and a horizontal seed conveying auger seed cleaning mechanism (9) and a sundry residue conveying auger seed cleaning mechanism (10) are arranged below the round hole screen and the tail screen;

the miscellaneous residue conveying auger seed cleaning mechanism (10) comprises a groove-shaped cross-section conveying auger cover (10-1) extending towards the conveying direction, and the bottom of the conveying auger cover is hinged with an openable circular hole arc-shaped sieve (10-2); the hinged end of the circular hole arc-shaped screen is fixedly connected with one end of a fixed connecting rod (10-3), the other end of the fixed connecting rod is hinged with one end of an actuating connecting rod (10-4), the other end of the actuating connecting rod is hinged with one end of an intermediate lever (10-5), the other end of the intermediate lever is hinged to a hinged shaft (10-8) supported below the other side of the circular hole arc-shaped screen, and the hinged end of the hinged shaft is connected with a regulating and controlling handle (10-7).

3. A combined soybean harvester according to claim 2, wherein: the output end of the impurity conveying auger seed cleaning mechanism is connected with the input end of the threshing and separating device through a re-threshing elevator.

4. A combined soybean harvester according to claim 1, 2 or 3, wherein: the cleaning device comprises a front grid screen and a rear grid screen which are arranged on the upper part of the screen frame; the front and rear grid sieves respectively comprise a frame which is formed by an upward inclined front plate, side plates at two sides and a rear plate, and sieve sheets which are arranged in the frame and distributed at intervals; the side plate is provided with an upper row of hinged holes which are uniformly distributed at intervals and a lower row of abdicating holes which are correspondingly distributed at intervals; hinge pins extend from the upper end side and the lower end side of the sieve sheet respectively; the hinge pins on the two sides of the upper end are respectively hinged with the corresponding hinge holes, and the hinge pins on the two sides of the lower end are respectively hinged with the corresponding holes of the outer connecting rod after extending out of the corresponding abdicating holes, so that a multiple parallel four-bar mechanism is formed.

5. The soybean combine harvester of claim 4, wherein: the upper end of a first sieve sheet in the sieve sheets is fixedly connected with the upper end of the first sieve sheet through an upper end hole of an adjusting handle, and a middle hole of the adjusting handle is movably connected with the lower end of the first sieve sheet; the pull-down hole of the adjusting handle extends to the driver control console through a pull wire.

6. The soybean combine harvester of claim 5, wherein: the threshing separation device comprises a threshing chamber frame with an upper cover, a left circular hole concave sieve and a right circular hole concave sieve which are combined, a threshing cylinder supported on the threshing chamber frame and a transmission system;

the lower part of the cover plate of the upper cover is hinged with the middle hinge holes of a group of guide plates which are distributed at intervals along the axial direction of the threshing cylinder through hinge strips; one end of each guide plate is hinged through a connecting rod to form a parallel connecting rod mechanism.

7. The soybean combine harvester of claim 6, wherein: the guide plate at one end is fixedly connected with one end of the guide adjusting rod through a hinge fulcrum shaft fixedly connected with a hinge hole in the middle of the guide plate and a connecting block; the cover plate is fixedly provided with a scale plate for limiting the gears of the diversion adjusting rod, the scale plate is provided with stop grooves with upward openings and distributed at intervals, and two sides and the upper part of the scale plate are semi-surrounded by the limiting frame.