CN114731851A - Adjustable cleaning system of soybean harvester - Google Patents
Adjustable cleaning system of soybean harvester Download PDFInfo
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- CN114731851A CN114731851A CN202210175825.1A CN202210175825A CN114731851A CN 114731851 A CN114731851 A CN 114731851A CN 202210175825 A CN202210175825 A CN 202210175825A CN 114731851 A CN114731851 A CN 114731851A
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- screen
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- sieve
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/44—Grain cleaners; Grain separators
- A01F12/446—Sieving means
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D41/00—Combines, i.e. harvesters or mowers combined with threshing devices
- A01D41/12—Details of combines
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/44—Grain cleaners; Grain separators
- A01F12/442—Rotary cleaners
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/44—Grain cleaners; Grain separators
- A01F12/444—Fanning means
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/44—Grain cleaners; Grain separators
- A01F12/446—Sieving means
- A01F12/448—Sieve adjusting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
Abstract
The invention relates to an adjustable cleaning system of a soybean harvester, and belongs to the technical field of agricultural machinery. A main shaft of a uniform flow fan of the system is provided with a reducing belt wheel and is in transmission connection with a driving belt wheel through a transmission belt with a tension adjusting mechanism; the front grid sieve and the rear grid sieve in the system vibrating sieve respectively comprise sieve sheets which are arranged in a frame at intervals; the side plate of the back grid screen is provided with hinge holes and abdicating holes which are uniformly distributed at intervals; the upper ends of the screen pieces of the rear grid screens are respectively hinged with the corresponding hinging holes, and the lower ends of the screen pieces respectively extend out of the corresponding abdicating holes and then are hinged with the corresponding holes of the outer connecting rods to form a parallel four-connecting-rod mechanism; one of the screen pieces of the rear grid screen is fixedly connected and movably connected with the upper end and the lower end of the rear adjusting handle respectively. After the invention is adopted, the rotating speed of the fan and the rear grille screen can be adjusted according to requirements, thus the invention is suitable for harvesting, adjusting and cleaning soybeans with different varieties, planting modes and operation conditions, can obviously improve the cleaning efficiency and quality of soybean harvesting and reduce the cleaning loss.
Description
Technical Field
The invention relates to a cutting table of a harvester, in particular to an adjustable cleaning system of a soybean harvester, and belongs to the technical field of agricultural machinery.
Background
According to the knowledge of an applicant, the existing soybean harvesting basically adopts a rice and wheat combine harvester, and by means of a traditional fish-scale sieve structure, because the characteristics of soybean crops cannot be aimed at, the cleaning efficiency is low, the cleaning quality is poor, the straws and impurities are mixed, the cleaning loss is large, and the cleaning operation parameters cannot be adjusted, so that the soybean harvesting cleaning method cannot adapt to the soybean crops of different varieties, different planting modes and different operation working conditions. The applicants have concluded, through long-term research and experimentation, that: the most important parameters influencing the cleaning operation quality of the combine harvester are the rotating speed of a fan and the inclination angle of a vibrating screen.
The Chinese patent document with the application number of 201910051798.5 discloses a threshing and cleaning test bed suitable for crops with high water content such as corn, wheat and soybean, which comprises a simulation test bed for testing the operation conditions and the operation effects of working components such as a crop feeding system, a threshing system, a cleaning system, a chopping and throwing system and the like. Although the cleaning system of the technical scheme adopts the motor to realize the adjustment of the rotating speed of the fan, the adjustment of the inclination angle of the vibrating screen is not considered, so that the cleaning system is difficult to adapt to the soybean harvesting of different varieties, planting modes and operation working conditions, and has the defects of improving the cleaning efficiency and quality of the soybean harvesting and reducing the cleaning loss. And the combined harvester adopts a plurality of frequency converters and a plurality of motors, can only be used for an indoor test bed, and is not suitable for the combined harvester for field operation.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, the adjustable cleaning system of the soybean harvester, which is suitable for different varieties, planting modes and operation conditions, is provided to improve the cleaning efficiency and quality of soybean harvesting and reduce the cleaning loss.
In order to achieve the purposes, the invention discloses a basic technical scheme of an adjustable cleaning system of a soybean harvester, which comprises the following steps: comprises a cleaning room frame, a uniform flow fan arranged below the feeding end of the cleaning room frame and a vibrating screen arranged at the middle layer of the cleaning room frame;
the main shaft of the uniform flow fan is provided with a reducing belt wheel and is in transmission connection with a driving belt wheel through a transmission belt with a tension adjusting mechanism;
the vibrating screen comprises a front grid screen, a tail screen and a rear grid screen which are sequentially arranged on the upper part of the screen frame;
the front grid sieve and the rear grid sieve respectively comprise a frame which is mainly formed by a front plate, side plates at two sides and a rear plate in a surrounding mode, and sieve sheets which are arranged in the frame and distributed at intervals;
the side plate of the rear grid screen 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; the upper ends of the screen pieces of the rear grid screens are respectively hinged with the corresponding hinging holes, and the lower ends of the screen pieces respectively extend out of the corresponding abdicating holes and then are hinged with the corresponding holes of the outer connecting rods to form a parallel four-connecting-rod mechanism; the upper end of one of the screen pieces of the rear grid screen is fixedly connected with the upper end of a rear adjusting handle, and the middle part of the rear adjusting handle is movably connected with the lower end of one of the screen pieces of the rear grid screen.
The invention is further perfected in that the reducing belt wheel is composed of a pair of reducing wheels which have the axial approaching trend and opposite transmission conical surfaces under the action of the elastic part; the tensioning adjusting mechanism comprises a tensioning adjusting rod fixing frame which is provided with gears and fixed on the cleaning room frame, and a tensioning wheel connecting plate of which two ends respectively support a floating tensioning wheel and a fixed shaft tensioning wheel; the floating tension wheel and the fixed shaft tension wheel are respectively positioned on the inner side and the outer side of the transmission belt; the tensioning wheel connecting plate is fixedly connected with the lower end of a gear rod, and the upper end of the gear rod is connected with a compression rod sleeve which can axially and relatively stretch out and draw back; the lower end of the compression rod sleeve is provided with a structure clamped into the gear; when the gear of the compression rod sleeve clamped on the tension adjusting rod fixing frame is changed, the tensioning force of the transmission belt is changed through the floating tensioning wheel and the fixed shaft tensioning wheel, and the meshing radius of the reducing belt wheel and the reducing belt wheel is changed.
After the invention is adopted, in the threshing process, the transmission diameter of the reducing belt wheel can be changed conveniently by adjusting the tensioning adjusting mechanism, and simultaneously, the inclination angle of the sieve sheet of the rear grid sieve can be changed by means of the rear adjusting handle, so that the rotating speed of the fan and the rear grid sieve can be adjusted as required: when the loss is too large and the impurity content is not high, the rotating speed is reduced, and the inclination angle of the sieve sheet is reduced; when the loss is not large and the impurity content is high, the rotating speed is increased and the inclination angle of the sieve sheet is increased. Therefore, the soybean harvester is suitable for harvesting, adjusting and cleaning soybeans of different varieties, planting modes and operation conditions, is very suitable for a combine harvester operating in the field, can obviously improve the cleaning efficiency and quality of soybean harvesting, and reduces the cleaning loss.
The invention is further perfected in that the side plate of the front grid screen is provided with hinged holes which are uniformly distributed at intervals in the upper row and abdicating holes which are correspondingly distributed at intervals in the lower row; the upper ends of the screen pieces of the front grid screen are respectively hinged with the corresponding hinge holes, and the lower ends of the screen pieces respectively extend out of the corresponding abdicating holes and are hinged with the outer connecting rods to form a parallel four-bar mechanism; the upper end of one of the sieve plates of the front grid sieve is fixedly connected with the upper end of a front adjusting handle, and the middle of the front adjusting handle is movably connected with the lower end of one of the sieve plates of the front grid sieve and is in linkage connection with the rear adjusting handle. Therefore, the inclination angle of the sieve sheet of the front grid sieve can be adjusted as appropriate, which is more favorable for improving the cleaning efficiency and quality of soybean harvest and reducing the cleaning loss.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic perspective view of a first embodiment of the present invention.
Fig. 2 is a schematic perspective view of a portion of the vibrating screen of the embodiment of fig. 1.
Fig. 3 is a schematic perspective view of another view of the vibrating screen portion of the embodiment of fig. 1.
Fig. 4 is a schematic perspective view of the reducing pulley in the embodiment of fig. 1.
Fig. 5 is a perspective view of the tension adjusting mechanism in the embodiment of fig. 1.
Fig. 6 is a schematic perspective view of the tension adjusting rod fixing frame of the embodiment of fig. 1.
Fig. 7 is a schematic perspective view of the rear grid screen in the embodiment of fig. 1.
Fig. 8 is a schematic perspective exploded view of the rear grid screen in the embodiment of fig. 1.
Fig. 9 is a schematic perspective view of the tail screen in the embodiment of fig. 1.
Fig. 10 is a schematic perspective view of the grid screen of fig. 1 according to a second embodiment of the present invention.
Detailed Description
Example one
The adjustable cleaning system of the soybean harvester is applied to the soybean combine harvester, the basic structure of which is as shown in figure 1, a uniform flow fan 2 is arranged below the feeding end of a cleaning room frame 1, and a vibrating screen 10 is arranged on the middle layer. The main shaft of the uniform flow fan 2 is provided with a reducing belt wheel 3 which is in transmission connection with a driving belt wheel 8 through a transmission belt 6 with a tension adjusting mechanism 4.
As shown in figure 5, the reducing belt wheel 3 is characterized in that a pair of reducing wheels 3-1 with opposite transmission conical surfaces are connected together through a bolt nut 3-3 for axial limiting, and have an axial approaching trend under the action of an elastic piece 3-2 connected between the reducing wheels, and the maximum distance is limited by the length of a bolt. The tensioning adjusting mechanism 4 is shown in fig. 5 and 6 and comprises a tensioning adjusting rod fixing frame 5 fixed on the cleaning room frame 1 and a tensioning wheel connecting plate 4-4 of which two ends are respectively supported with a floating tensioning wheel 4-5 and a dead axle tensioning wheel 4-5' of which the rotating shaft is hinged on the cleaning room frame 1. The floating tension pulley 4-5 and the dead axle tension pulley 4-5' are respectively positioned at the inner side and the outer side of the trapezoidal section transmission belt 6 when being assembled. A horizontal shift plate 5-1 of the tension adjusting rod fixing frame 5 is provided with a plurality of shift holes 5-2 communicated with the middle sliding grooves. The tensioning wheel connecting plate 4-4 is fixedly connected with the lower end of the gear rod 4-3, the upper end of the gear rod 4-3 is sleeved with a compression rod sleeve 4-1 which can axially and relatively stretch out and draw back through a reducing section, and a spring 4-2 is arranged between the gear rod 4-3 and the compression rod sleeve 4-1. The outer diameter of the middle section of the compression rod sleeve 4-1 is smaller than the width of the middle sliding chute, and the two ends are respectively provided with a conical expanding section with the major diameter larger than the diameter of the gear hole 5-2, so that the conical expanding section at the lower end can be conveniently clamped into the selected gear hole 5-2 as required after the compression rod sleeve 4-1 is pressed downwards and the gear is shifted, and further the floating tension wheel 4-5 is shifted relative to the fixed shaft tension wheel 4-5', and the tension of the transmission belt is changed. More specifically, the compression rod sleeve 4-1 is pressed downwards to compress the compression spring, the compression rod sleeve 4-1 and the gear lever 4-3 move relatively to change the gear hole 5-2 of the tension adjusting rod fixing frame 5, and the tension of the tension wheel on the belt can be changed. When the radial acting force of the reducing wheel is increased, the distance is increased, so that the transmission diameter is reduced, and the rotating speed of the fan is increased; when the radial acting force is reduced, the distance is reduced under the action of the extension spring, so that the transmission diameter is increased, and the regulation and control of the rotating speed of the fan are realized.
The vibration starting mechanism of the vibrating screen 10 is very common and will not be described in detail, and the structure thereof is as shown in fig. 2 and 3, and includes a front grid screen 10-2, a rear grid screen 10-4, a rear grid screen 10-5, and a circular hole screen 10-3 located at the lower part, which are installed in sequence on the upper part of a screen frame 10-1. The middle lower part and the rear lower part of the screen frame 10-1 are respectively provided with a grain collecting frame 10-6.
The rear grid screen 10-5 has a specific structure as shown in fig. 7 and 8, and includes a frame mainly defined by an upwardly inclined front plate a1, side plates a4 at both sides, and a rear plate a6, and screen blades a5 arranged in the frame at intervals. The side plate A4 is provided with an upper row of hinge holes A4.1 which are uniformly distributed at intervals and a lower row of abdicating holes A4.2 which are correspondingly distributed at intervals; the upper and lower ends of each sieve sheet A5 extend out of a hinge pin A5.1, so the two sides of the upper end are hinged with the corresponding hinge holes A4.1, and the two sides of the lower end extend out of the corresponding abdicating holes A4.2 and 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 plate 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 P plate.
The structure of the front grid sieve 10-2 is similar to that of the grid sieve 10-5, details are not expanded, the corresponding front adjusting handle is in linkage connection with a pull-down hole A2.3 of a rear adjusting handle A2 through a pull wire 9, and the pull wire 9 extends to a cab of the soybean combine harvester through a pull wire fixing frame 7. Therefore, when the pull wire 9 is pulled in the cab, the screen sheet can be synchronously rotated around the upper hinge point by adjusting the handle, and the screen sheet inclination angle regulation of the front and rear grid screens is realized.
The tail screen 10-4 of the present embodiment is mainly composed of a plurality of parallel screen bars D2 and a screen bar mounting frame D1, as shown in fig. 9, and a plurality of screen bars D2 are uniformly mounted on the screen bar mounting frame D1, so that the screen bars are in a comb shape. The tail sieve 10-4 is mainly used for separating longer soybean straws and preventing the soybean straws from entering the grain collecting frame 10-6 along with soybean seeds.
The embodiment can ensure that after the soybean plants are threshed by the threshing cylinder above the cleaning system, soybean seeds, partial soybean straws, bean pods and the like fall on the screen surface of the vibrating screen. Under normal conditions, soybean seeds, small straws and bean pods at the front end of the vibrating screen are distributed more, and large straws at the rear end of the vibrating screen are distributed more. During cleaning operation, the four-blade uniform flow fan rotates to generate cross-flow wind to blow backwards, so that the soybean straws and bean pods move towards the rear end of the cleaning system, and soybean grains fall and are screened out through the front grid screen, the circular hole screen and the front grain collecting frame respectively; the straws and the bean pods move to the rear end of the cleaning system and are thrown out of the cleaning system gradually under the cleaning wind power and the vibration action of the vibrating screen, and soybean grains mixed in the straws and the bean pods fall from the rear grid screen and the rear grain collecting frame in the vibration process to be screened out. In the operation process of the soybean combine harvester, a driver can adjust the rotating speed of the fan and the inclination angles of the front and rear grid sieves as required according to the observed impurity content of soybeans in a grain tank and the field soybean seed loss condition. When the loss is too large, the compression rod sleeve is pressed to adjust the tensioning adjusting mechanism to be gradually positioned in a gear hole on the right side, the tensioning force of the tensioning wheel on the belt is reduced, the radial force and the effective diameter of the belt on the reducing belt wheel are further reduced, and the rotating speed of the fan is reduced; when the impurities are too high, the compression rod sleeve is pressed to adjust the tensioning adjusting mechanism to be gradually positioned in a gear hole on the left side, the tensioning force of the tensioning wheel on the belt is increased, the radial force and the effective diameter of the belt on the reducing belt wheel are increased, and the rotating speed of the fan is increased; on the other hand, the handle can be adjusted by pulling the pull wire as appropriate, so that the inclination angle of the grid screen sheet is reduced.
In a word, the embodiment creates the front and rear grid screen type vibrating screens and a simple and convenient fan rotating speed adjusting mechanism aiming at the attributes of soybean crops, so that the fan rotating speed, the inclination angle of the front grid screen and the inclination angle of the rear grid screen can be adjusted, the soybean harvester is suitable for adjusting soybean harvesting and cleaning operation parameters under different working conditions, the problems of large soybean cleaning loss and more impurities are effectively solved, and the soybean harvester can be practically applied to a combine harvester operating in fields.
Example two
The basic structure of the adjustable cleaning system of the soybean harvester of the embodiment is the same as that of the first embodiment, and the difference is as shown in fig. 10, hinge pins A5.1 extending from the upper end side and the lower end side of each screen sheet A5 of the rear grid screen are hinged with corresponding hinge pin holes of an upper connecting rod A3.1 and a lower connecting rod A3.2 respectively to form a rear screen assembly of a multiple parallel four-bar mechanism, and then the rear screen assembly is arranged in a frame formed by a front plate, side plates at two sides and a rear plate of the rear grid screen. The structure of the front grid screen can be analogized. Therefore, the assembly is more convenient, and the inclination angle adjustment is more stable and reliable.
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 (8)
1. An adjustable cleaning system of a soybean harvester comprises a cleaning room frame (1), a uniform flow fan (2) arranged below the feeding end of the cleaning room frame, and a vibrating screen (10) arranged at the middle layer of the cleaning room frame; the method is characterized in that:
a main shaft of the uniform flow fan (2) is provided with a reducing belt wheel (3) and is in transmission connection with a driving belt wheel (8) through a transmission belt with a tension adjusting mechanism (4);
the vibrating screen (10) comprises a front grid screen (10-2), a tail screen (10-4) and a rear grid screen (10-5) which are sequentially arranged on the upper part of a screen frame (10-1);
the front grid screen (10-2) and the rear grid screen (10-5) respectively comprise a frame which is mainly surrounded by a front plate (A1), side plates (A4) at two sides and a rear plate (A6), and screen pieces (A5) which are arranged in the frame and distributed at intervals;
the side plate of the rear grid screen 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; the upper ends of the screen pieces (A5) of each rear grid screen are respectively hinged with the corresponding hinged holes, and the lower ends of the screen pieces respectively extend out of the corresponding abdicating holes and are then hinged with the corresponding holes of the outer connecting rods (A3) to form a parallel four-bar mechanism; the upper end of one of the screen sheets of the rear grid screen is fixedly connected with the upper end of a rear adjusting handle (A2), and the middle part of the rear adjusting handle (A2) is movably connected with the lower end of one of the screen sheets of the rear grid screen.
2. The adjustable cleaning system of a soybean harvester according to claim 1, characterized in that: the reducing belt wheel (3) is composed of a pair of reducing wheels (3-1) which have the axial approaching trend under the action of the elastic part (3-2) and have opposite transmission conical surfaces; the tensioning adjusting mechanism (4) comprises a tensioning adjusting rod fixing frame (5) which is provided with gears and is fixed on the cleaning room frame (1), and tensioning wheel connecting plates (4-4) of which two ends respectively support a floating tensioning wheel (4-5) and a dead axle tensioning wheel; the floating tension wheel and the fixed shaft tension wheel are respectively positioned on the inner side and the outer side of the transmission belt; the tensioning wheel connecting plate (4-4) is fixedly connected with the lower end of a gear rod (4-3), and the upper end of the gear rod (4-3) is connected with a compression rod sleeve (4-1) which can axially and relatively stretch out and draw back; the lower end of the compression rod sleeve (4-1) is provided with a structure clamped into the gear; when the gear of the compression rod sleeve (4-1) clamped on the tension adjusting rod fixing frame (5) is changed, the engagement radius of the reducing belt wheel (3) and the reducing belt wheel (3) is changed by changing the tension of the transmission belt through the floating tension wheel and the fixed shaft tension wheel.
3. The adjustable cleaning system of a soybean harvester according to claim 2, characterized in that: the side plate of the front grid screen 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; the upper ends of the screen pieces of the front grid screen are respectively hinged with the corresponding hinging holes, and the lower ends of the screen pieces respectively extend out of the corresponding abdicating holes to be hinged with the outer connecting rod to form a parallel four-connecting-rod mechanism; the upper end of one of the sieve plates of the front grid sieve is fixedly connected with the upper end of a front adjusting handle, and the middle of the front adjusting handle is movably connected with the lower end of one of the sieve plates of the front grid sieve and is in linkage connection with the rear adjusting handle.
4. The adjustable cleaning system of a soybean harvester according to claim 3, characterized in that: a plurality of gear holes communicated with the middle sliding grooves are formed in the horizontal gear shifting plate of the tensioning adjusting rod fixing frame; the tensioning wheel connecting plate is fixedly connected with the lower end of the gear lever; the upper end of the gear rod is sleeved with a compression rod sleeve which can axially and relatively stretch out and draw back through a reducing section, and a spring is arranged between the gear rod and the compression rod sleeve.
5. A soybean harvester adjustable cleaning system as defined in claim 4, wherein: the outer diameter of the middle section of the compression rod sleeve is smaller than the width of the middle sliding chute, and two ends of the compression rod sleeve are respectively provided with a conical expanding section with the major diameter larger than the diameter of the gear hole.
6. The adjustable cleaning system of a soybean harvester according to claim 5, characterized in that: the front adjusting handle and the rear adjusting handle are connected in a linkage mode through pull wires, and the pull wires extend to the cab.
7. The adjustable cleaning system of a soybean harvester according to claim 6, characterized in that: the tail sieve is composed of a plurality of mutually parallel sieve bars and a sieve bar mounting rack and is in a comb shape.
8. A soybean harvester adjustable cleaning system according to any one of claims 3 to 7, characterized in that: hinge pins extending from the upper end and the lower end of each screen of the front grid screen and the rear grid screen are hinged with corresponding hinge pin holes of an upper connecting rod and a lower connecting rod of the front grid screen and the rear grid screen respectively to form a front screen assembly and a rear screen assembly of the multiple parallel four-connecting-rod mechanism, and then the front screen assembly and the rear screen assembly are respectively installed in frames of the front grid screen and the rear grid screen.
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| CN202210175825.1A CN114731851B (en) | 2022-02-25 | 2022-02-25 | Adjustable cleaning system of soybean harvester |
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| CN208490274U (en) * | 2018-07-10 | 2019-02-15 | 河北首丰农业机械科技有限公司 | A kind of shift drive mechanism of the impurity elimination blower for crop harvester |
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2022
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| JP2006094767A (en) * | 2004-09-29 | 2006-04-13 | Iseki & Co Ltd | Sorting device of threshing unit |
| CN103688684A (en) * | 2013-12-16 | 2014-04-02 | 江苏大学 | Adjusting device and adjusting method for grading sieve piece opening of combine harvester |
| CN203661659U (en) * | 2013-12-16 | 2014-06-25 | 江苏大学 | Device for adjusting sieve piece opening degree of cleaning sieve of combine harvester |
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