A peanut harvesting wind screening device

Abstract

The present invention provides a peanut harvesting wind screening device, which includes an upper screen body, a lower screen body, a positive pressure crossflow fan, a first negative pressure crushing fan, and a second negative pressure crushing fan; the upper screen body is a hollow box-shaped structure; the area near the tail of the bottom plate of the upper screen body is a grid plate; the top plate of the upper screen body is a front shaking plate, a front picker, a rear shaking plate, and a rear picker from the head to the tail of the upper screen body; the head of the upper screen body is connected to the crossflow fan that generates positive pressure; a light impurity outlet is arranged between the rear edge of the rear picker and the tail end plate of the upper screen body; a first negative pressure crushing fan is arranged above the tail of the upper screen body, which is aligned with the light impurity outlet and the rear edge of the rear picker. A second negative pressure crushing fan is arranged above the tail of the lower screen body. The present invention realizes positive and negative pressure multi-wind system series wind selection, four-stage three-dimensional multi-screen surface screening, and wind selection and screening combination for large feed volume and complex material composition, which greatly improves the screening efficiency.

Description

Technical Field

[0001] The invention relates to the field of agricultural machinery, and in particular to a peanut harvesting wind screening device. Background Art

[0002] Peanut is the most internationally competitive high-quality oil crop in my country, with an annual planting area of ​​more than 70 million mu. With the rapid growth of peanut planting area in Xinjiang and Northeast China and the development of large-scale production in traditional production areas, the domestic demand for efficient peanut mechanized harvesting technology and equipment is becoming increasingly urgent. The wind screening device of the present invention is mainly equipped with a self-propelled full-feed peanut combine harvester. The full-feed combine harvester can complete the combined harvesting operations such as peanut picking, fruit picking, cleaning, transportation, and fruit collection at one time. It has high efficiency, low loss, and good adaptability, representing the current development direction of efficient peanut combine harvesting technology. When the combine harvester is operating, a large amount of material mixture is formed after picking and fruit picking operations, and a cleaning device is required to screen the peanut pods from the material mixture. Full-feed combine harvesting is mainly dry picking, and the amount of cleaning materials is large, with many long impurities, short impurities, and light impurities. The floating critical speed of peanut pods and impurities is similar, which is the main reason for the poor operation quality of the cleaning link of the full-feed combine harvester. At present, the existing domestic fully-fed combined harvester cleaning mechanisms generally have problems with operation quality, such as unclear separation of fruits and impurities, high wind and screen losses, cleaning efficiency problems with small batch cleaning processing volume, and operation smoothness problems such as film wrapping and hanging seedlings, and screen surface blockage. Due to the existence of the above problems, most equipment has added a re-cleaning device for secondary cleaning, which increases the cost of the whole machine.

[0003] Since the cleaning materials generated by the full-feed combine harvester are quite large, and the amount of cleaning materials will also increase with the increase of the forward speed of the harvester, the cleaning device is required to have more efficient cleaning efficiency and cleaning quality. In order to improve the cleaning efficiency and cleaning quality under the condition of large material volume, the current peanut picking machine operating on the field generally increases the spatial configuration height of the cleaning device, and increases the wind selection efficiency and cleaning quality by increasing the height difference of the material mixture falling. However, as a self-propelled full-feed combine harvester, due to the limited space configuration of the whole machine, it is impossible to leave enough space for the cleaning device to configure the height alone. In addition, the cleaning mechanism problems of the current self-propelled full-feed combine harvester in the market are as follows: 1. They are mainly based on wind selection, and the cleaning quality is improved by increasing the wind speed in the wind field. The increase in wind speed will blow the effective pods out of the machine, increasing the blowing loss of the whole machine. In addition, in order to cover up the blowing loss, they are equipped with a crushing device to crush the effective pods blown out of the machine and send them into the grass box, so it is difficult for farmers to find the lost pods. 2. As the existing cleaning mechanism mainly uses wind selection, the wind speed is very high, causing increasingly serious dust pollution and causing great pollution to the village environment. 3. As the forward speed increases, the amount of materials to be cleaned increases rapidly, and the cleaning quality decreases significantly. The existing models have to be equipped with a re-selection device to perform a second cleaning of the materials, which increases power loss and the cost of the whole machine. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides a peanut harvesting wind screening device, which adopts "multi-wind system, positive and negative pressure combination" wind selection and "multi-stage three-dimensional, longitudinal combination" screening to achieve wind selection and screening combination, solving the problems of low cleaning quality, low efficiency and poor smoothness in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides a peanut harvesting wind screening device, which is arranged on a frame and comprises an upper screen body and a lower screen body; wherein:

[0006] The upper screen body is a hollow box-shaped structure, and the two sides of its head are rotatably connected to the bottom ends of the two front swing arms respectively, and the top ends of the front swing arms are rotatably connected to the frame; the two sides of the tail of the upper screen body are rotatably connected to the top ends of the two driving arms; the middle part of the driving arm is rotatably connected to the frame; the area near the tail of the bottom plate of the upper screen body is a grid plate;

[0007] The front part of the lower screen body is located below the grid plate to receive the leaked material of the grid plate, and the bottom ends of the two driving arms are rotatably connected to the two sides of the lower screen body respectively; the two sides of the rear part of the lower screen body are rotatably connected to the frame through two rear swing arms, and at least one of the driving arms is rotatably connected to the non-center area of ​​a flywheel through a rod; the driving arm is used to drive the upper screen body and the lower screen body to vibrate;

[0008] The top plate of the upper sieve body is composed of a front shaking plate, a front pick-driving device, a rear shaking plate, and a rear pick-driving device in order from the head to the tail of the upper sieve body; the front shaking plate and the rear shaking plate are provided with a corrugated structure, the front pick-driving device and the rear pick-driving device are in a grid shape, and a plurality of sawtooth structures inclined toward the tail of the upper sieve body are provided on the upper surface thereof; the grid mesh of the front pick-driving device is larger than the grid mesh of the rear pick-driving device;

[0009] The head of the upper sieve body is connected to a cross-flow fan that generates positive pressure; a light impurity outlet opening upward is provided between the rear edge of the rear remover and the tail end plate of the upper sieve body; a first negative pressure crushing fan aligned with the light impurity outlet and the rear edge of the rear remover is provided above the tail of the upper sieve body; a second negative pressure crushing fan is provided above the rear of the lower sieve body;

[0010] The rear edge of the grid plate adjacent to the tail of the upper screen body is higher than its opposite front edge, so that a wedge-shaped airflow channel with a thick front end and a thin rear end is formed between the grid plate and the top plate of the upper screen body; the grid plate includes a plurality of blade plates arranged along the transverse direction of the upper screen body, and the front edge of the blade plate facing the head of the upper screen body is lower than its rear edge; there is a gap for material dropping between adjacent blade plates.

[0011] A further improvement of the present invention is that the lower screen body is a round hole screen, a discharge collection port is arranged at the rear of the lower screen body, the height of the front of the lower screen body is higher than the height of the rear of the lower screen body, and the longitudinal length of the lower screen body is greater than 2.7 m.

[0012] A further improvement of the present invention is that the front pick-removing device and the rear pick-removing device include a plurality of strip-shaped sawtooth plates arranged longitudinally along the upper screen body and a plurality of strip-shaped connecting plates arranged transversely along the upper screen body; the sawtooth structure is arranged at the top edge of the strip-shaped sawtooth plates; the strip-shaped connecting plates sequentially pass through each of the strip-shaped sawtooth plates, and the top edge thereof is bent toward the tail direction of the upper screen body to form a guide structure;

[0013] In the front pickaxe, the spacing between adjacent strip-shaped connecting plates is 59-61 mm, and the spacing between adjacent strip-shaped serrated plates is 69-71 mm;

[0014] In the rear picker, the spacing between adjacent strip-shaped connecting plates is 34-36 mm, and the spacing between adjacent strip-shaped serrated plates is 39-42 mm.

[0015] A further improvement of the present invention is that the height of the middle part of the bottom plate of the upper screen body is lower than the height of the front part of the bottom plate.

[0016] A further improvement of the present invention is that the width of the air outlet of the cross-flow fan and the width of the air inlet of the first negative pressure pulverizing fan are the same as the width of the upper sieve body; the cross-section of the air inlet of the first negative pressure pulverizing fan is parallel to the top plate plane of the upper sieve body.

[0017] A further improvement of the present invention is that the air inlet of the second negative pressure pulverizing fan is the same width as the lower sieve body; the cross section of the air inlet of the second negative pressure pulverizing fan is parallel to the screen surface of the lower sieve body, and the distance between the two is 8cm to 15cm.

[0018] A further improvement of the present invention is that the flywheel is connected to the power device via a drive shaft.

[0019] The beneficial technical effects of the present invention are:

[0020] (1) Two types of front and rear draft shakers are designed for different material quantities and different material compositions to achieve two-level longitudinal screening of materials on the upper screen surface. A rear shaking plate is configured between the front and rear draft shakers to achieve re-mixing, breaking up and stratification of materials, greatly improving screening efficiency.

[0021] (2) It contains 4 types of screen surfaces (front draft remover, rear draft remover, grid plate, and round hole screen), and the 4 types of screen surfaces are arranged in three layers: upper, middle, and lower, to achieve four-level three-dimensional screening of materials.

[0022] (3) The material is screened four times in succession, and the long impurities, short impurities, light impurities, and soil impurities are screened out of the machine in different screening stages. Among them, most of the soil impurities are screened out of the machine through the lower screen body, rather than being blown out by air selection as in existing models, so the dust caused is very small.

[0023] (4) Three fans form a positive and negative pressure multi-wind system in series for air separation, including two negative pressure fans and one positive pressure fan. Different fans are configured at different screening stages to achieve air separation of different material components and improve air separation efficiency. The three fans perform their respective duties and share the load, so the wind speed of each fan does not need to be too high.

[0024] (5) The upper screen body and the lower screen body are driven by the same drive shaft. The two screen bodies vibrate in opposite directions. The vibration of the double screen bodies is self-balanced, which effectively reduces the impact of the double screen bodies on the vibration of the whole machine.

[0025] (6) The product has ingenious design, compact structure, simple construction, convenient assembly, easy cleaning, and smooth operation, and is suitable for material cleaning of mobile combine harvesting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a peanut harvesting wind screening device;

[0027] Figure 2is a cross-sectional view of the upper screen body;

[0028] Figure 3 It is a three-dimensional view of the upper screen body and the lower screen body.

[0029] The accompanying drawings are marked as follows:

[0030] Upper screen body 1, front shaking plate 11, front remover 12, rear shaking plate 13, rear remover 14, light impurity outlet 15, strip serrated plate 16, strip connecting plate 17, lower screen body 3, front swing arm 4, driving arm 5, grid plate 6, blade plate 61, rear swing arm 7, crossflow fan 8, first negative pressure pulverizing fan 9a, second negative pressure pulverizing fan 9b. DETAILED DESCRIPTION

[0031] The following is based on the attached Figure 1 , give the preferred embodiments of the present invention, and describe them in detail so that the functions and features of the present invention can be better understood.

[0032] See also Figures 1 to 3 As shown, an embodiment of the present invention includes a peanut harvesting wind screening device, which is arranged on a frame and includes an upper screen body 1 and a lower screen body 3. Specifically:

[0033] The upper screen body 1 is a hollow box-shaped structure, and the two sides of its head are rotatably connected to the bottom ends of the two front swing arms 4, and the top ends of the front swing arms 4 are rotatably connected to the frame; the two sides of the tail of the upper screen body 1 are rotatably connected to the top ends of the two driving arms 5; the middle of the driving arms 5 is rotatably connected to the frame; the area near the tail of the bottom plate of the upper screen body 1 is a grid plate 6;

[0034] The front part of the lower screen body 3 is located below the grid plate 6 to receive the leaked material of the grid plate 6, and the bottom ends of the two driving arms 5 are rotatably connected to the two sides of the lower screen body 3 respectively; the two sides of the rear part of the lower screen body 3 are rotatably connected to the frame through two rear swing arms 7, and at least one driving arm 5 is rotatably connected to the non-center area of ​​a flywheel through a rod; the driving arm 5 is used to drive the upper screen body 1 and the lower screen body 3 to vibrate.

[0035] During operation, the flywheel is connected to the power device through the drive shaft, so that the drive arm 5 swings, thereby causing the upper screen body 1 and the lower screen body 3 to vibrate synchronously in opposite directions. The double screen body vibration is self-balanced, which effectively reduces the impact of the double screen body on the vibration of the whole machine.

[0036] The top plate of the upper sieve body 1 is composed of a front shaking plate 11, a front picker 12, a rear shaking plate 13, and a rear picker 14 from the head to the tail of the upper sieve body 1; the front shaking plate 11 and the rear shaking plate 13 are provided with a corrugated structure, the front picker 12 and the rear picker 14 are in a grid shape, and a plurality of sawtooth structures inclined toward the tail of the upper sieve body 1 are provided on the upper surface; the grid mesh of the front picker 11 is larger than the grid mesh of the rear picker 14. The top edges of the four side walls of the upper sieve body 1 are higher than the height of its top plate to prevent peanut pods from falling from the edge of the top plate of the upper sieve body 1.

[0037] The front shaking plate 11 is used to receive the mixture of peanut pods and impurities output by the fruit picking device, and the impurities include soil impurities and long and short impurities of peanut vines. During the shaking process of the upper sieve body 1, the peanut pods and impurities gradually move from front to back on the upper sieve body 1. The front edge of the front picker 12 is welded to the rear edge of the front shaking plate 11. The front picker 12 is mainly used to break up the material (a mixture of peanut pods and impurities), and screen out the long impurities and push them to the rear shaking plate 13, and some short impurities, peanut pods, and soil impurities are discharged by the front picker 12. The front picker 12 has a large amount of material, and a larger mesh size should be used to allow more pods to be discharged as quickly as possible.

[0038] During the shaking process of the upper screen body 1, the function of the rear shaking plate 13 is to re-mix, break up, and layer the materials on the rear shaking plate and push them backwards. The pods that are not missed by the front ejector 12 will be layered on the rear shaking plate 13, that is, long impurities and short impurities are in the upper layer, and pods are in the lower layer, which greatly improves the efficiency of the re-screening by the rear ejector 14.

[0039] The front edge of the rear picker 14 is welded to the rear edge of the rear shaking plate 13. The material pushed by the rear shaking plate 13 directly enters the rear picker 14. The rear picker 14 screens out the long impurities and short impurities and pushes them to the tail of the upper screen body 1. After the first material screening by the front picker 12, the amount of material pushed to the rear picker 14 is significantly reduced, including a small amount of pods, most of the long impurities and short impurities. In order to prevent the long impurities and short impurities from being leaked by the rear picker 14, a smaller mesh size should be used while ensuring that the pods are leaked.

[0040] like Figure 2 As shown ( Figure 2 The front pick-up device 12 and the rear pick-up device 14 are partially enlarged in the figure, the front pick-up device 12 and the rear pick-up device 14 include a plurality of strip-shaped sawtooth plates 16 arranged longitudinally along the upper screen body 1 and a plurality of strip-shaped connecting plates 17 arranged transversely along the upper screen body 1; the sawtooth structure is arranged on the top edge of the strip-shaped sawtooth plates 16; the strip-shaped connecting plates 17 pass through each strip-shaped sawtooth plate 16 in sequence, and the top edge thereof is bent toward the tail of the upper screen body 1 to form a guide structure;

[0041] In the front pick-evicting device 12, the spacing between adjacent strip-shaped connecting plates 17 is 59-61 mm, and the spacing between adjacent strip-shaped sawtooth plates 16 is 69-71 mm. In this embodiment, the grid size of the front pick-evicting device 12 is 70 mm (horizontally) × 60 (vertically) mm.

[0042] In the rear pick-removing device 14, the spacing between adjacent strip-shaped connecting plates 17 is 34-36 mm, and the spacing between adjacent strip-shaped sawtooth plates 16 is 39-42 mm. In this embodiment, the grid size of the rear pick-removing device 14 is 40 mm (transverse) × 35 (vertical) mm.

[0043] In this embodiment, the head of the upper sieve body 1 is connected to the crossflow fan 8 that generates positive pressure; a light impurity outlet 15 opening upward is provided between the rear edge of the rear remover 14 and the tail end plate of the upper sieve body 1; a first negative pressure crushing fan 9a is provided above the tail of the upper sieve body 1, which is aligned with the light impurity outlet 15 and the rear edge of the rear remover 14. The crossflow fan 8 and the first negative pressure crushing fan 9a cooperate with each other to form a uniform wind field from front to back inside the upper sieve body 1, and the wind field can directly act on the materials leaked by the front and rear removers. Usually, the fans used in the cleaning part of the peanut combine harvester are axial flow fans. When the fan shaft is longer, the wind speed of the axial flow fan outlet is large at both ends and small in the middle, resulting in serious unevenness of the wind field. The use of the crossflow fan 8 can completely avoid the above phenomenon, and the wind pressure generated by the crossflow fan is greater under the same power.

[0044] In this embodiment, the positive pressure and negative pressure of the crossflow fan 8 and the first negative pressure pulverizing fan 9a complement each other, and the airflow blown out by the crossflow fan 8 passes through the cavity inside the upper sieve body 1 and is finally absorbed by the first negative pressure pulverizing fan 9a, so that a uniform wind field can be formed in the relatively closed upper sieve body 1. In this process, since the airflow is absorbed by the first negative pressure pulverizing fan 9a, it can be avoided that the airflow passes through the front pick 12 and flows upward to hinder the falling of materials.

[0045] The height of the middle part of the bottom plate of the upper sieve body 1 is lower than the height of the front part of the bottom plate, so that the airflow channel in the front half of the upper sieve body 1 is a wedge-shaped channel with a small front cross-section and a large rear cross-section. In addition, the rear edge of the grid plate 6 near the tail of the upper sieve body 1 is higher than its opposite front edge, which forms a wedge-shaped airflow channel with a thick front end and a thin rear end between the grid plate 6 and the top plate of the upper sieve body 1. During operation, the front and rear wedge-shaped channels make the wind field at the front and rear ends of the upper sieve body 1 faster, while the airflow in the middle is relatively gentle. This allows the material to be better stratified in the middle of the upper sieve body 1. During the stratification process, the heavier peanut pods are at the bottom, and the light and short impurities are at the top, which makes the light and short impurities easier to be carried by the wind field.

[0046] The materials dropped by the front and rear pickers will roll backwards continuously under the action of the wind field inside the upper screen body 1 and the vibration of the upper screen body 1. The rolling can further break up the materials, and the pods wrapped by short and light impurities will be separated from them during the rolling process. Compared with piled materials, scattered materials are more conducive to the wind field carrying short and light impurities.

[0047] The grid plate 6 is in the shape of a shutter, and includes a plurality of blade plates 61 arranged transversely along the upper sieve body 1, and the front edge of the blade plate 61 facing the head of the upper sieve body 1 is lower than its rear edge; there is a gap for dropping materials between adjacent blade plates 61. In this embodiment, the horizontal spacing of the blade plates 61 is 150 mm, and the angle between each blade plate 61 and the top surface of the upper sieve body 1 is 30°. Under the action of the wind field and vibration, the peanut pods inside the upper sieve body 1 fall from the gaps between the blade plates 61.

[0048] Other functions of the grid plate 6 are: ① It can serve as a wind guide plate to guide the wind field generated by the cross-flow fan to flow to the air inlet of the first negative pressure crushing fan 9a, so that light impurities and short impurities are discharged from the light impurity outlet 15 at the tail of the upper screen body 1; ② As the screen body vibrates, the material is broken up, long impurities are screened out and pushed backwards and discharged from the light impurity outlet 15 at the tail of the upper screen body 1.

[0049] The width of the air outlet of the cross-flow fan 8 and the width of the air inlet of the first negative pressure crushing fan 9a are the same as the width of the upper sieve body 1; the cross section of the air inlet of the first negative pressure crushing fan 9a is parallel to the top plate plane of the upper sieve body 1. The first negative pressure crushing fan 9a is used not only to absorb the light impurities and short impurities discharged from the light impurity outlet 15, but also to absorb the long impurities that cannot fall down and are pushed by the rear ejector 14.

[0050] The lower screen body 3 is a round hole screen, with a material discharging and collecting port at its rear, a front part thereof having a higher height than the rear part thereof, an angle of 3° with the horizontal direction, and a longitudinal length greater than 2.7 m, so as to ensure that a large amount of material mixture can be effectively dispersed during the backward shaking and conveying process. A second negative pressure crushing fan 9b is arranged above the rear part of the lower screen body 3.

[0051] The pods discharged from the grid plate 6 are mixed with a small amount of soil and light impurities. During the vibration of the lower sieve body 3, the pod mixture moves backward, soil and impurities fall from the sieve holes of the round hole sieve, and the pods finally fall from the discharge collection port at the tail of the lower sieve body 3. Some light impurities are sucked away by the second negative pressure pulverizing fan 9b. The air inlet of the second negative pressure pulverizing fan 9b is the same width as the lower sieve body 3; the air inlet section of the second negative pressure pulverizing fan 9b is parallel to the sieve surface of the lower sieve body 3, and the distance between the two is 8cm to 15cm.

[0052] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A peanut harvesting wind screening device, arranged on a frame, characterized in that: It comprises an upper sieve body (1) and a lower sieve body (3); wherein: The upper screen body (1) is a hollow box-shaped structure, and the two sides of the head are respectively rotatably connected to the bottom ends of two front swing arms (4), and the top ends of the front swing arms (4) are rotatably connected to the frame; the two sides of the tail of the upper screen body (1) are rotatably connected to the top ends of two driving arms (5); the middle part of the driving arm (5) is rotatably connected to the frame; the area of ​​the bottom plate of the upper screen body (1) near the tail is a grid plate (6); The front part of the lower screen body (3) is located below the grid plate (6) to receive the material leaking from the grid plate (6); the bottom ends of the two driving arms (5) are rotatably connected to the two sides of the lower screen body (3); the two sides of the rear part of the lower screen body (3) are rotatably connected to the frame through two rear swing arms (7); at least one of the driving arms (5) is rotatably connected to a non-center area of ​​a flywheel through a rod; the driving arm (5) is used to drive the upper screen body (1) and the lower screen body (3) to vibrate; The top plate of the upper sieve body (1) is composed of a front shaking plate (11), a front expelling pick (12), a rear shaking plate (13), and a rear expelling pick (14) from the head to the tail of the upper sieve body (1); the front shaking plate (11) and the rear shaking plate (13) are provided with a corrugated structure, the front expelling pick (12) and the rear expelling pick (14) are in a grid shape, and a plurality of sawtooth structures inclined toward the tail of the upper sieve body (1) are provided on their upper surfaces; the grid mesh of the front expelling pick (11) is larger than the grid mesh of the rear expelling pick (14); The head of the upper sieve body (1) is connected to a cross-flow fan (8) that generates positive pressure; a light impurity outlet (15) opening upward is provided between the rear edge of the rear expelling device (14) and the rear end plate of the upper sieve body (1); a first negative pressure crushing fan (9a) is provided above the rear of the upper sieve body (1) and is aligned with the light impurity outlet (15) and the rear edge of the rear expelling device (14); a second negative pressure crushing fan (9b) is provided above the rear of the lower sieve body (3); The rear edge of the grid plate (6) adjacent to the tail of the upper sieve body (1) is higher than its opposite front edge, so that a wedge-shaped airflow channel with a thick front end and a thin rear end is formed between the grid plate (6) and the top plate of the upper sieve body (1); the grid plate (6) comprises a plurality of blade plates (61) arranged in a transverse direction of the upper sieve body (1), and the front edge of the blade plate (61) facing the head of the upper sieve body (1) is lower than its rear edge; and gaps for material dropping are formed between adjacent blade plates (61); The front pick-up device (12) and the rear pick-up device (14) comprise a plurality of strip-shaped sawtooth plates (16) arranged longitudinally along the upper sieve body (1) and a plurality of strip-shaped connecting plates (17) arranged transversely along the upper sieve body (1); the sawtooth structure is arranged on the top edge of the strip-shaped sawtooth plates (16); the strip-shaped connecting plates (17) pass through each of the strip-shaped sawtooth plates (16) in sequence, and the top edge thereof is bent toward the tail of the upper sieve body (1) to form a flow guide structure; In the front pick-up device (12), the spacing between adjacent strip-shaped connecting plates (17) is 59-61 mm, and the spacing between adjacent strip-shaped sawtooth plates (16) is 69-71 mm; In the rear picker (14), the spacing between adjacent strip-shaped connecting plates (17) is 34-36 mm, and the spacing between adjacent strip-shaped sawtooth plates (16) is 39-42 mm; The width of the air outlet of the cross-flow fan (8) and the width of the air inlet of the first negative pressure pulverizing fan (9a) are the same as the width of the upper sieve body (1); the cross section of the air inlet of the first negative pressure pulverizing fan (9a) is parallel to the top plate plane of the upper sieve body (1).

2. A peanut harvesting wind screening device according to claim 1, characterized in that: The lower screen body (3) is a round hole screen, a material discharging and collecting port is arranged at the rear part thereof, the height of the front part thereof is higher than the height of the rear part thereof, and the longitudinal length thereof is greater than 2.7 m.

3. The peanut harvesting wind screening device according to claim 1, characterized in that: The height of the middle part of the bottom plate of the upper screen body (1) is lower than the height of the front part of the bottom plate.

4. The peanut harvesting wind screening device according to claim 1, characterized in that: The air inlet of the second negative pressure pulverizing fan (9b) is the same width as the lower sieve body (3); the cross section of the air inlet of the second negative pressure pulverizing fan (9b) is parallel to the screen surface of the lower sieve body (3), and the distance between the two is 8cm to 15cm.

5. The peanut harvesting wind screening device according to claim 1, characterized in that: The flywheel is connected to the power device through a driving shaft.

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