A multi-layer segmented regenerated rice grain cleaning sieve

Abstract

The present invention provides a multi-layer segmented regenerated rice grain cleaning screen, comprising: a cleaning screen frame and a shaking plate, an upper woven screen, a middle louver screen, a tail fish scale screen and a lower woven screen installed on the cleaning screen frame; the front end of the upper woven screen is connected to the end of the shaking plate, the front end of the tail fish scale screen is connected to the end of the middle louver screen, and the tail fish scale screen is arranged to be inclined upward; the middle louver screen comprises a screen plate, a plurality of first draft strip groups and a plurality of second draft strip groups, the first draft strip group comprises two first draft strips, and the two first draft strips are distributed in an "eight" shape, the second draft strip group is arranged above the screen plate, and comprises a plurality of mutually parallel second draft strips, and the second draft strips are arranged in a front-to-back direction. The present invention can improve the grain screening rate and carry out layered diffusion of high-moisture content exudates.

Description

Technical Field

[0001] The present invention relates to the field of agricultural harvesting equipment, in particular to a multi-layer segmented regenerated rice grain cleaning screen. Background Art

[0002] Ratoon rice, a type of rice variety cultivated from dormant buds that survive harvest on rice stubble, allows them to mature again by heading. This variety offers numerous advantages over traditional rice. Rice yields have reached a plateau in recent years, but planting ratoon rice can effectively increase the multiple cropping index and boost yields. Compared to double-season rice, ratoon rice eliminates three production steps: seedling raising, tillage, and transplanting. This eliminates the bottleneck of double-season rice production, which often requires a tight production period. Furthermore, it offers significantly higher returns.

[0003] The cleaning device is a crucial component of a rice-wheat combine harvester, and its performance directly impacts the overall machine's performance. Fan-driven vibrating screen cleaning devices are widely used due to their high stability and adaptability. Harvesting the first crop of ratoon rice (the first season of the harvest) requires special technical requirements compared to conventional rice. Therefore, a ratoon rice cleaning device must provide the following:

[0004] The agronomic requirement for the first season of ratoon rice harvest is to retain a high stubble retention rate, meaning only the rice ear is harvested approximately 40 cm below the head, preserving dormant buds on the stubble for the second season. Consequently, the straw-to-grain ratio of the material entering the combine harvester is lower than that of ordinary rice, typically only around 1:1. The threshed material contains approximately 90% grain, with the remaining debris mostly consisting of short stems (stems less than 8 cm in length), leaves, long grass, and some light debris. Therefore, the cleaning screen must have a high seed penetration rate to accommodate the extremely high seed content in the threshed material and improve cleaning efficiency.

[0005] During the first-crop rice harvest, the crop has lush stems and green leaves, and a high moisture content. After passing through the threshing device, the material grows grass and leaves mixed with grains, which clump onto the cleaning screen surface. This reduces cleaning efficiency and increases grain contamination and loss. Therefore, the cleaning screen must be able to effectively stratify and disperse the regenerated rice material in conjunction with airflow, separating the grains from other debris.

[0006] When working in the field, ratoon rice combine harvesters inevitably crush the harvested rice piles, directly impacting the yield of the ratoon season. To minimize this loss, ratoon rice combine harvesters typically use wide-swath headers for harvesting, reducing the number of times the harvester travels back and forth across the field. Compared to conventional combine harvesters, ratoon rice combine harvesters require a higher feed rate, requiring a highly efficient cleaning device to prevent the accumulation of waste on the screen surface and to separate the various components of the waste in a very short time, thereby ensuring the harvester's speed in the field.

[0007] The cleaning screen commonly used for rice grains is mostly composed of a shaking plate, a fish scale screen (upper screen), a draft screen (tail screen) and a woven screen (lower screen). The fish scale screen has good air conduction performance and strong pushing ability. The tail draft screen can cooperate with the airflow to discharge large impurities such as stems out of the machine. However, the moisture separation capacity of the cleaning screen with this structure is weak. The regenerated rice extrudate is special. Its high moisture content material is easy to clog and accumulate on the screen surface of the fish scale screen, reducing the cleaning efficiency. The extrudate contains little stems, and the tail draft screen cannot fully play its role, but instead causes the effective area of ​​the cleaning screen to be reduced. Therefore, the cleaning effect of the traditional rice grain cleaning screen for regenerated rice extrudate is not ideal. Summary of the Invention

[0008] In response to the shortcomings of the existing technology, the present invention provides a multi-layer segmented regenerated rice grain cleaning screen, which improves the grain screening rate by using different screen pieces, and makes full use of the multi-layer screen structure and airflow to diffuse the high-moisture content exudate in layers.

[0009] The present invention achieves the above technical objectives through the following technical means.

[0010] A multi-layer segmented regenerated rice grain cleaning screen comprises: a cleaning screen frame, a shaking plate installed on the cleaning screen frame, an upper woven screen, a middle louver screen, a tail fish scale screen and a lower woven screen;

[0011] The upper woven screen, the middle louver screen and the lower woven screen are arranged in sequence from top to bottom, the front end of the upper woven screen is connected to the end of the shaking plate, the front end of the tail fish scale screen is connected to the end of the middle louver screen, and the tail fish scale screen is arranged upwardly inclined;

[0012] The middle-layer louver screen includes a screen plate, a plurality of first draft-scraping bar groups and a plurality of second draft-scraping bar groups. The first draft-scraping bar group includes two first draft-scraping bars installed on the cleaning screen frame, and the two first draft-scraping bars are distributed in an "eight" shape. The second draft-scraping bar group is arranged above the screen plate, and the second draft-scraping bar group includes a plurality of mutually parallel second draft-scraping bars, and the second draft-scraping bars are arranged in a front-to-back direction.

[0013] Furthermore, the mesh size of the upper woven screen is 50 mm×50 mm.

[0014] Furthermore, the shaking plate and the upper woven screen are located at the same height plane.

[0015] Furthermore, the sieve plate is a long rectangular flat steel plate that has not been punched, the thickness of the sieve plate is 3 mm, and the opening of the sieve plate is 15 mm to 35 mm.

[0016] Furthermore, the cleaning screen frame includes two opposite cleaning screen side panels, the middle louver screen is installed on the cleaning screen side panels, the angle α between the first draft strip and the cleaning screen side panels is 15°~30°, and the angle α is toward the tail fish scale screen.

[0017] Furthermore, the spacing between the second draft-deleting strips in the second draft-deleting strip group is 50 mm to 80 mm.

[0018] Furthermore, the mesh size of the lower woven screen is 20 mm×20 mm.

[0019] Furthermore, the angle between the tail fish scale screen and the horizontal plane is 5° to 10°

[0020] Furthermore, the opening of the tail fish scale screen is 15mm to 35mm.

[0021] Furthermore, it also includes an air guide plate, which is located below the shaking plate. The air guide plate divides the air duct below the shaking plate into an upper air duct and a lower air duct. The airflow in the upper air duct passes through the space between the shaking plate and the middle louver screen and blows to the space between the upper woven screen and the middle louver screen; the airflow in the lower air duct blows to the space between the middle louver screen and the lower woven screen.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention uses a louver screen as the middle screen, effectively exerting its advantages of strong air-guiding ability and high grain screening rate, which is suitable for the high grain content of regenerated rice extract, and is beneficial to improving the cleaning efficiency. By adding an upper woven screen above the louver screen, most of the stems in the regenerated rice extract can be effectively prevented from falling into the middle louver screen and the lower woven screen, thereby effectively reducing the cleaning load of the middle louver screen and the lower woven screen, and improving the grain cleaning rate.

[0024] 2. The second draft-cleaning bar group of the present invention is provided with a plurality of draft-cleaning bars distributed in the direction from front to back, which can effectively make up for the shortcoming of the poor pushing ability of the louver screen, and cooperate with the airflow to push the debris such as leaves and long grass with high moisture content to the tail of the screen, so as to avoid the accumulation of a large amount of material on the screen surface. According to the distribution of the grains of the off-gassing device of the longitudinal axial flow, the grain content gradually increases from the middle to the two sides. The draft-cleaning bars distributed in the shape of "eight" in the first draft-cleaning bar group can make the off-gassing falling on both sides of the middle louver screen surface gather to the middle of the screen surface, so that the material is evenly distributed on the screen surface, effectively utilizing the effective area of ​​the screen surface, reducing the local cleaning load, and improving the cleaning effect.

[0025] 3. The present invention uses a fish scale screen to replace the tail sieve of the traditional cleaning screen. In view of the fact that the stem content in the regenerated rice extract is extremely low, it avoids the space waste caused by the traditional sieve, effectively increases the effective cleaning area of ​​the cleaning screen, and effectively removes long grass and leaves from the machine.

[0026] 4. The present invention incorporates an air divider beneath the shaking plate, which divides the airflow from the cleaning blower's upper outlet into two upper and lower ducts. The upper duct flows between the upper woven screen and the middle louvered screen, where the vibration of the screen pushes large debris such as stems, long grass, and leaves to the screen tail and out of the machine. The lower duct flows between the middle louvered screen and the lower woven screen, where it removes light debris. The multi-layered screens and airflow combined with the present invention enable stratification and diffusion of high-moisture content materials within a limited space, improving cleaning quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The structure of a multi-layer segmented regenerated rice grain cleaning screen according to an embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 The structure of a multi-layer segmented regenerated rice grain cleaning screen according to an embodiment of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 3 for Figure 1 A side cross-sectional view of a medium-layer segmented regenerated rice grain cleaning sieve;

[0030] Figure 4 for Figure 1 Schematic diagram of the structure of the middle layer louver screen;

[0031] Figure 5 for Figure 1 A top view of the middle louver screen;

[0032] Figure 6 for Figure 1 The welding structure diagram of the beam assembly and the draft strip is shown in FIG.

[0033] Figure 7 for Figure 1 Airflow direction diagram of the multi-layer segmented regenerated rice grain cleaning screen during operation.

[0034] Figure 8 for Figure 1 Material flow diagram during the operation of the multi-layer segmented regenerated rice grain cleaning screen.

[0035] Reference numerals:

[0036] 1-shaking plate; 2-upper woven screen; 3-middle louver screen; 301-louver screen plate; 302-first draft strip; 303-second draft strip; 304-crossbeam assembly; 305-louver screen side; 4-tail fish scale screen; 5-lower woven screen; 6-air guide plate; 601-upper air duct; 602-lower air duct; 7-cleaning screen side plate; 8-cleaning fan; 801-upper air outlet; 802-lower air outlet; 9-grain augers; 10-miscellaneous augers. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] First, a multi-layer segmented regenerated rice grain cleaning screen according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] See also Figures 1 to 8According to an embodiment of the present invention, a multi-layer segmented regenerated rice grain cleaning screen includes a cleaning screen frame and a shaking plate 1 installed on the cleaning screen frame, an upper woven screen 2, a middle louver screen 3, a tail fish scale screen 4 and a lower woven screen 5.

[0042] Specifically, the upper woven screen 2, the middle louver screen 3 and the lower woven screen 5 are arranged in sequence from top to bottom, the front end of the upper woven screen 2 is connected to the end of the shaking plate 1, and the front end of the upper woven screen 2 and the shaking plate 1 are located at the same height plane. Preferably, the sieve hole size of the upper woven screen 2 is 50mm×50mm, so as to better adapt to the length characteristics of the stems in the regenerated rice extract. The sieve holes of this size can prevent most of the stems and some long grass from falling into the middle louver screen 3 and the lower woven screen 5, thereby effectively reducing the cleaning load of the middle louver screen 3 and the lower woven screen 5, and improving the grain cleaning rate, while smaller impurities such as grains and leaves can pass through the sieve holes of the upper woven screen 2.

[0043] The cleaning screen frame includes two opposite cleaning screen side panels 7, and the middle louver screen 3 is installed on the cleaning screen side panels 7. The middle louver screen 3 includes a screen plate 301, a plurality of first draft strip groups, a plurality of second draft strip groups and a beam assembly 304. The screen plate 301 is a long rectangular flat steel plate with a thickness of 3 mm and no stamping. The opening of the screen plate 301 can be adjusted between 15 mm and 35 mm. The plate makes the middle louver screen 3 have better air-guiding ability and high grain screening rate, which is suitable for the characteristics of high grain content of regenerated rice extract, and is conducive to improving the cleaning efficiency.

[0044] The first draft-cleaning bar group includes two first draft-cleaning bars 302 respectively installed on the two cleaning screen side plates 7. The two first draft-cleaning bars 302 are distributed in an "eight" shape. Preferably, the angle α between the first draft-cleaning bars 302 and the cleaning screen side plates 7 is 15°~30°, and the angle α is toward the tail fish scale screen 4, which can make the exudate falling on both sides of the screen surface gather to the middle of the screen surface, thereby making the material evenly distributed on the screen surface, reducing the local cleaning load and improving the cleaning effect.

[0045] like Figure 4 As shown, the crossbeam assembly 304 is connected to the side edge 305 of the middle louver screen by bolts and nuts, and is installed on the cleaning screen side plate 7 together with the middle louver screen 3. Figure 1 As shown, the distance between the beams in the beam assembly 304 is 4 times the distance between the louver screen plates 301, and each beam assembly is located directly above the upper edge of the louver screen plates 301, which does not affect the normal screening of the material.

[0046] The second draft-squeezing strip group includes a plurality of second draft-squeezing strips 303 parallel to each other. The second draft-squeezing strips 303 are arranged in a front-to-back direction. Preferably, the spacing between the second draft-squeezing strips 303 is 50 mm to 80 mm, which can effectively make up for the shortcoming of the poor pushing ability of the louver screen, and cooperate with the airflow to push the high-moisture content leaves and grass clippings and other debris to the tail of the screen, thereby avoiding the accumulation of a large amount of material on the screen surface.

[0047] The mesh size of the lower woven screen 5 is 20mm×20mm. The front end of the tail fish scale screen 4 is connected to the end of the middle louver screen 3. The tail fish scale screen 4 is tilted upward. Figure 2 As shown, the angle between the tail fish scale screen 4 and the horizontal plane is 5° to 10°, and the opening of the tail fish scale screen 4 can be adjusted between 15mm and 35mm. It is based on the characteristic that the stem content in the regenerated rice extract is extremely low, avoids the space waste caused by the traditional draft screen, and effectively increases the effective cleaning area of ​​the cleaning screen.

[0048] like Figure 3 and Figure 7 As shown, the wind guide plate 6 is located below the shaking plate 1, and the wind guide plate 6 divides the air duct below the shaking plate 1 into an upper air duct and a lower air duct. The airflow in the upper air duct passes through the gap between the shaking plate 1 and the middle louver screen 3 and blows to the space between the upper woven screen 2 and the middle louver screen 3; the airflow in the lower air duct blows to the space between the middle louver screen 3 and the lower woven screen 5.

[0049] The cleaning screen of the embodiment of the present invention is applied to a harvester, such as Figure 7 As shown, the air flow blown out from the lower air outlet of the cleaning fan 8 passes through the lower woven screen 802 and flows to the screen tail. Figure 8 As shown, the regenerated rice residue falls from the threshing drum, with a portion falling onto the shaking plate 1. The shaking plate 1 transports and gathers this portion of the residue backward, and then disperses it onto the upper woven screen 2, which is tightly connected to it. The other portion of the residue falls directly onto the upper woven screen 2. The upper woven screen 2 vibrates and cooperates with the airflow blown out from the upper air duct 601 to push the stems and long grass backward to the screen tail and outside the machine.

[0050] like Figure 8 As shown, the regenerated rice extract passes through the upper woven screen 2 and falls into the middle louver screen 3. The grains in the extract quickly pass through the middle louver screen 3. Under the combined action of the screen plate 301 and the downwind duct 602, the debris with a low floating coefficient, such as leaves and grass, is blown to the tail fish scale screen 4 by the air flow. After further cleaning, the unremoved materials in the debris will fall into the secondary debris auger 10 below the tail fish scale screen 4, and the remaining debris will be pushed out of the machine.

[0051] The grains pass through the middle louvered screen 3 and fall into the lower woven screen 5. The airflow from the lower air outlet 802 of the cleaning fan 8 blows the light impurities to the screen tail and outside the machine; the grains fall into the grain agitator 9 just below the cleaning screen.

[0052] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A multi-layer segmented regenerated rice grain cleaning sieve, characterized in that: include: A cleaning screen frame, a shaking plate (1) mounted on the cleaning screen frame, an upper woven screen (2), a middle louver screen (3), a tail fish scale screen (4), a lower woven screen (5), and an air guide plate (6); The upper woven screen (2), the middle louver screen (3) and the lower woven screen (5) are arranged in sequence from top to bottom, the front end of the upper woven screen (2) is connected to the end of the shaking plate (1), the front end of the tail fish scale screen (4) is connected to the end of the middle louver screen (3), and the tail fish scale screen (4) is arranged upwardly inclined; the middle louver screen (3) includes a screen plate (301), a plurality of first draft-clearing strip groups and a plurality of second draft-clearing strip groups, the first draft-clearing strip group includes two first draft-clearing strips (302) installed on the cleaning screen frame, the two first draft-clearing strips (302) are distributed in an "eight" shape, the second draft-clearing strip group is arranged above the screen plate (301), the second draft-clearing strip group includes a plurality of mutually parallel second draft-clearing strips (303), and the second draft-clearing strips (303) are arranged in a direction from front to back; The mesh size of the upper woven screen (2) is 50 mm × 50 mm, the shaking plate (1) and the upper woven screen (2) are located at the same height plane, the screen piece (301) is a long rectangular flat steel plate that has not been punched, the thickness of the screen piece (301) is 3 mm, and the opening of the screen piece (301) is 15 mm to 35 mm; The cleaning screen frame comprises two opposing cleaning screen side panels (7), the middle louver screen (3) is mounted on the cleaning screen side panels (7), the angle α between the first draft strip (302) and the cleaning screen side panels (7) is 15° to 30°, and the angle α is directed toward the tail fish scale screen (4); The spacing between the second draft strips (303) in the second draft strip group is 50 mm to 80 mm; The mesh size of the lower woven screen (5) is 20 mm × 20 mm; The angle between the tail fish scale screen (4) and the horizontal plane is 5° to 10°; The opening of the tail fish scale screen (4) is 15mm~35mm; The air guide plate (6) is located below the shaking plate (1), and the air guide plate (6) divides the air duct below the shaking plate (1) into an upper air duct and a lower air duct. The airflow of the upper air duct passes through the space between the shaking plate (1) and the middle louver screen (3) and blows toward the space between the upper woven screen (2) and the middle louver screen (3); the airflow of the lower air duct blows toward the space between the middle louver screen (3) and the lower woven screen (5).

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