A corn ear threshing device with segmented and orderly feeding

Abstract

The invention discloses a corn cob threshing device with segmented and orderly feeding, which relates to the field of corn harvesting machinery. The device comprises a main beam, a drum support, a drum top cover, a threshing drum, a feeding head lower cover, a corrugated concave plate screen, a convex concave plate screen, a separating concave plate screen, a debris removal plate and a concave plate screen adjustment mechanism. The main beam is mounted on both sides of the drum top cover, the drum top cover is mounted directly above the threshing drum, the threshing drum is mounted on the drum supports on both sides, the corrugated concave plate screen, the convex concave plate screen and the separating concave plate screen are sequentially arranged directly below the threshing drum, respectively constituting a corrugated threshing section, a convex threshing section and a separating section, the debris removal plate is mounted at the rear end of the threshing drum, and the concave plate screen adjustment mechanism is mounted on the main beam. The threshing posture of corn cobs and the concave plate gap can be adjusted in segments by adopting the present invention, so as to enhance the rubbing area of ​​the rib rod and the friction between the cobs, effectively improve the threshing efficiency and reduce the grain breakage rate.

Description

Technical Field

[0001] The invention relates to the field of corn harvesting machinery, and in particular to a corn ear threshing device with segmented and orderly feeding. Background Art

[0002] As a staple food crop, corn ranks first in both planting area and total production. The corn grain combine harvester can realize the integrated operations of picking ears, threshing and cleaning, significantly improving the efficiency and quality of harvesting operations. It is of strategic significance to promoting the high-quality development of the corn industry and ensuring food security. In the direct corn kernel harvesting operation, corn kernel damage caused by the threshing process has become a major bottleneck problem restricting the improvement of corn harvest quality. During the threshing process, corn ears are transported into the threshing drum by the action of the spiral auger. Under the kneading and squeezing action of the rib rod, the kernels are separated from the core shaft and pass through the concave plate screen to complete the threshing process. However, when threshing with the existing threshing device, the posture of the corn ears is disordered, resulting in a reduction in the effective contact area between the threshing elements and the ears, which increases the impact on each ear and increases the kernel breakage rate. In addition, the randomly distributed ear materials weaken the kneading and friction between the ears, resulting in reduced threshing efficiency, prolonged kernel residence time in the threshing chamber, and further aggravated kernel breakage. To optimize the threshing posture of corn ears in the threshing chamber, a non-balanced corn pre-threshing device with sequential feeding of corn ears is disclosed in Chinese invention patent CN 117730688A. The device uses a posture correction pipe to adjust the forward direction of the corn ears, thereby achieving axial feeding of the corn ears into the threshing drum; Chinese invention patent CN 117769987A A multi-channel, orderly kneading threshing device for mechanized corn harvesting with low loss and high efficiency is being developed. This device uses a star wheel and a pressure roller to adjust the corn cob's posture. However, the aforementioned technology is complex to implement, making it difficult to directly apply to the longitudinal axial flow threshing drum system of a corn harvester. Therefore, the development of a segmented, orderly feeding corn cob threshing device is crucial for improving threshing efficiency and reducing kernel breakage. This device optimizes the corn cob's threshing posture, enhances the kneading area of ​​the ribs, and increases the friction between the cobs. Summary of the Invention

[0003] The object of the present invention is to provide a corn cob threshing device with segmented and orderly feeding, which can adjust the threshing posture of corn cobs through the joint action of segmented concave plate screens, enhance the rubbing area of ​​the ribs and the friction between the cobs, so as to solve the problems of low threshing efficiency and high breakage rate caused by the disordered posture of corn cobs in the existing threshing process, and effectively improve the quality of corn harvesting operations.

[0004] A corn cob threshing device with segmented and orderly feeding comprises a main beam, a drum support, a drum top cover, a threshing drum, a feeding head lower cover, a corrugated concave plate screen, a convex concave plate screen, a separating concave plate screen, a debris removal plate and a concave plate screen adjusting mechanism. The two drum supports are fixedly arranged on a harvester frame, the main beam is welded on both sides of the drum top cover, the drum top cover is detachably arranged on the drum support by bolts, the threshing drum is rotatably arranged between the two drum supports, the feeding head lower cover is arranged at the front end of the drum top cover and connected to the main beam, the corrugated concave plate screen is arranged below the drum top cover and located at the rear of the feeding head lower cover, the corrugated concave plate screen is connected to the main beam through the concave plate screen adjusting mechanism, the convex concave plate screen is arranged below the drum top cover and located at the rear of the corrugated concave plate screen, the convex concave plate screen is connected to the main beam through the concave plate screen adjusting mechanism, the separating concave plate screen is arranged below the drum top cover and located at the rear of the convex concave plate screen, the separating concave plate screen is connected to the main beam, and the debris removal plate is arranged at the tail of the separating concave plate screen.

[0005] The threshing drum includes a drum spline shaft, a feeding head, a drum body, a threshing rod, threshing spikes, a discharge plate and a drum shaft. The feeding head is composed of a conical shell and a spiral blade welded to the shell. The feeding head is arranged at the front end of the drum body, the drum spline shaft is arranged at the front end of the feeding head, the threshing rod is axially spirally arranged in the front middle section of the drum body, the threshing spikes are axially spirally arranged in the rear section of the drum body, the discharge plate is circumferentially distributed at the rear end of the drum body, the drum shaft is arranged at the rear end of the drum body, and the threshing drum is rotatably arranged between two drum brackets through the drum spline shaft and the drum shaft.

[0006] The drum top cover includes a top cover shell, a feed port shell and a top cover side plate. The drum top cover is arranged directly above the threshing drum, the feed port shell is arranged directly above the feed head, and the top cover side plates are arranged on both sides of the top cover shell and are connected to the drum bracket by bolts.

[0007] The corrugated concave plate screen includes a corrugated concave plate, a first concave plate long beam and a corrugated concave plate grid. The corrugated concave plate is arranged on both sides of the first concave plate long beam. The corrugated concave plate grid is rotatably arranged in the arc groove of the corrugated concave plate. The first concave plate long beam is connected to the main beam through the concave plate screen adjustment mechanism. The corrugated concave plate screen and the threshing rods axially spirally arranged on the cylinder constitute a corrugated threshing section.

[0008] The convex hull concave plate screen includes a convex hull concave plate, a second concave plate long beam and a convex hull concave plate grid bar. The convex hull concave plate is arranged on both sides of the second concave plate long beam. The convex hull concave plate grid bar is arranged in the arc groove of the convex hull concave plate. The second concave plate long beam is connected to the main beam through the concave plate screen adjustment mechanism. The convex hull concave plate screen and the threshing rods axially spirally arranged on the cylinder constitute a convex hull threshing section.

[0009] The separation concave screen comprises a separation concave plate, a concave plate short beam and short round tube bars, wherein the separation concave plate is arranged on both sides of the concave plate short beam, the short round tube bars are arranged in the arc groove of the separation concave plate, and the separation concave screen and the threshing nail teeth axially spirally arranged on the cylinder constitute a separation section;

[0010] The tail end of the impurity removal plate separation concave plate screen is connected to the separation concave plate, and the impurity removal plate and the discharge plate circumferentially distributed at the tail end of the cylinder constitute an impurity removal section;

[0011] A first long beam lug is welded on one side of the first concave plate long beam, and the first long beam lug is connected to the main beam through the concave plate screen adjustment structure; the corrugated concave plate grating includes corrugated gratings and first long round tube gratings, and the two gratings are welded alternately and parallel to the grooves of the corrugated concave plate. The corrugated gratings are hexagonal prisms, and the edges are spirally twisted along the axial direction of the drum. The twisting direction is consistent with the rotation direction of the drum, and the edges are rounded.

[0012] A second long beam ear is welded on one side of the second concave plate long beam, and the second long beam ear is connected to the main beam through the concave plate screen adjustment structure; the convex hull concave plate bars include dense convex hull bars, second long round tube bars and sparse convex hull bars, and the three bars are welded in parallel at the convex hull concave plate groove in a combination of dense convex hulls, long round tubes, sparse convex hulls and long round tubes. A convex hull structure is welded on the surface of the dense convex hull bars, and every three convex hulls constitute a group of functional units. The length of each unit group matches the length of the corn ear, and each group of convex hulls is evenly distributed on the surface of the bar, and the convex hulls are all oriented towards the axis of the threshing drum. The sparse convex hull bars are welded with the same convex hulls, and every three convex hulls constitute a group of functional units. The length of each unit group matches the length of the corn ear, and each group of convex hulls is evenly distributed on the surface of the bar, and the convex hulls are all oriented towards the axis of the threshing drum. The distribution position corresponds to the spacing area of ​​each unit group of the dense convex hull bars to form a spatial complementary structure.

[0013] The concave plate screen adjustment mechanism includes a push rod fixing frame and an electric push rod. The push rod fixing frame is fixed to the main beam by bolts, and the electric push rod is fixed to the hanging ear of the push rod fixing frame by bolts. The connection mode of the electric push rod extension rod and the first long beam hanging ear and the second long beam hanging ear is hinged.

[0014] Beneficial effects of the present invention:

[0015] The present invention adopts a segmented concave plate screen. Through the concave plate screen adjustment mechanism arranged on the main beam, the concave plate gap can be adjusted in sections, so that the threshing chamber can adaptively match the optimal concave plate gap according to the thickness of the corn material flow, increase the effective contact area between the corn ears and the threshing elements, and reduce the impact per unit area on the ears. In addition, the concave plate gap adjustment mechanism based on the electric push rod realizes online regulation without the need for shutdown intervention, thereby improving operating efficiency.

[0016] The corrugated concave plate screen of this device adopts corrugated bars, and its edge corrugated structure can effectively guide the corn ears to adjust to the threshing posture in the axial direction of the drum, increase the contact area between the threshing rod and the ear, disperse the impact per unit area, and reduce the grain breakage rate. At the same time, the corrugated concave plate screen adopts a combination of corrugated bars and long round tube bars to avoid the problem of reduced grain screening efficiency due to excessively dense corrugated bars. It is suitable for working conditions with a large material flow thickness in the initial threshing stage, and effectively improves the threshing quality and efficiency.

[0017] The convex hull concave plate screen of this device adopts convex hull bars. Its convex hull structure can not only effectively adjust the posture of corn ears, making it more suitable for threshing operations, but also has an auxiliary threshing function, thereby significantly improving threshing efficiency and quality. The screen body uses a combined structure of "dense convex hull-circular tube-sparse convex hull-circular tube" to ensure the effect of adjusting the posture of the ears while avoiding the phenomenon of material accumulation caused by excessive convex hull resistance, ensuring that the material flow can pass quickly, and further improving the threshing quality and efficiency.

[0018] The present invention can be directly applied to the longitudinal axial flow threshing system of a corn grain harvester, greatly reducing the cost of technology conversion, and has high economic benefits and good promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the drum top cover after half-section processing according to the present invention;

[0020] Figure 2 This is a partial enlarged view of the concave plate screen adjustment mechanism of the present invention;

[0021] Figure 3 This is a schematic structural diagram of the drum top cover of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the threshing drum of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the segmented concave plate screen of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the corrugated concave plate screen bars of the present invention;

[0025] Figure 7 It is a schematic structural diagram of the convex and concave plate screen bars of the present invention.

[0026] The accompanying drawings are denoted as follows:

[0027] 1. Main beam; 2. Drum bracket; 3. Drum top cover; 301. Top cover shell; 302. Feed port shell; 303. Top cover side panels; 4. Threshing drum; 401. Drum spline shaft; 402. Feed head; 403. Drum body; 404. Threshing rod; 405. Threshing spikes; 406. Discharge plate; 407. Drum shaft; 5. Feed head lower cover; 6. Corrugated concave plate screen; 601. Corrugated concave plate; 602. First concave plate long beam; 6021. First long beam lifting lug; 603. Corrugated concave plate bars; 6031. Corrugated bars; 6032. First long round tube bar; 7, convex concave plate screen; 701, convex concave plate; 702, second concave plate long beam; 7021; second long beam lifting ear; 703, convex concave plate bar; 7031, dense convex bar bar; 7032, second long round tube bar; 7033, sparse convex bar bar; 8, separation concave plate screen; 801, separation concave plate; 802, concave plate short beam; 8021, short beam lifting ear; 8022, lifting eye bolt; 803, short round tube bar; 9, debris removal plate; 10, concave plate screen adjustment mechanism; 1001, push rod fixing bracket; 1002, electric push rod. DETAILED DESCRIPTION

[0028] See also Figures 1 to 7 As shown, a corn cob threshing device with segmented and orderly feeding includes a main beam 1, a drum bracket 2, a drum top cover 3, a threshing drum 4, a feeding head lower cover 5, a corrugated concave plate screen 6, a convex concave plate screen 7, a separation concave plate screen 8, a dust removal plate 9 and a concave plate screen adjustment mechanism 10. The main beam 1 is welded to both sides of the drum top cover 3, and the two drum brackets 2 are fixedly arranged on the harvester frame and connected to the drum top cover 3 by bolts, and support the drum spline shaft 401 and the drum shaft 407 through the bearings in the brackets. The drum top cover 3 is arranged directly above the threshing drum 4, the feeding head lower cover 5 is arranged below the feeding head 402, and is connected to the main beam 1 by bolts. The dust removal plate 9 is arranged at the tail end of the threshing drum 4 and is connected to the setting hole of the separation concave plate 801 by bolts. The concave plate screen adjustment mechanism 10 is arranged on the main beam 1 and is hinged to the corrugated first concave plate long beam 602 and the convex second concave plate long beam 702 by pins.

[0029] The concave plate screen adjustment mechanism 10 includes a push rod fixing frame 1001 and an electric push rod 1002. The push rod fixing frame 1001 is fixed to the main beam 1 by bolts, and the electric push rod 1002 is fixed to the hanging ear of the push rod fixing frame 1001 by bolts. A second long beam lifting ear 7021 is welded on one side of the second concave plate long beam 702. The extension rod of the electric push rod 1002 is hinged to the second long beam lifting ear 7021 through a pin shaft. The concave plate gap is adjusted by adjusting the extension length of the electric push rod 1002 extension rod. The electric push rod 1002 is electrically connected to the harvester battery. The control button of the electric push rod 1002 is set in the harvester cab. Short beam lifting ears 8021 are welded on both sides of the concave plate short beam 802. The short beam lifting ear 8021 and the main beam 1 are hinged by eye bolts 8022 and pin shafts. The concave plate gap is adjusted by adjusting the extension length of the eye bolt 8022 thread.

[0030] The drum top cover 3 includes a top cover shell 301, a feed inlet shell 302 and a top cover side plate 303. Ribs are welded at both ends of the top cover shell 301 and are connected to the top cover side plates 303 at the rib connection holes by bolts. The feed inlet shell 302 is arranged directly above the feeding head 402 and is welded into one with the top cover shell 301. The top cover side plates 303 are welded with side flanges and are connected to the drum bracket 2 at the side flange connection holes by bolts.

[0031] The threshing drum 4 includes a drum spline shaft 401, a feeding head 402, a cylinder 403, a threshing rod 404, threshing spikes 405, a discharge plate 406 and a drum shaft 407. The feeding head 402 is arranged at the front end of the cylinder 403, the drum spline shaft 401 is arranged at the front end of the feeding head 402, the threshing rod 404 is axially spirally arranged in the front middle section of the cylinder 403, the threshing spikes 405 are axially spirally arranged in the rear section of the cylinder 403, the discharge plate 406 is circumferentially distributed at the tail end of the cylinder 403, and the drum shaft 407 is arranged at the tail end of the cylinder 403;

[0032] The feeding head 402 consists of a conical outer shell and spiral blades welded to the outer shell. The roller spline shaft 401 is fixed to the front end face of the feeding head 402 through a flange. The roller shaft 407 is fixed to the rear end face of the cylinder 403 through a flange. The threshing rod 404 is welded to the outside of the cylinder 403 to form a threshing section. The threshing spikes 405 are welded to the outside of the cylinder 403 to form a separation section. The discharge plate 406 is welded to the outside of the cylinder 403 to form a debris discharge section.

[0033] The corrugated concave plate screen 6 includes a corrugated concave plate 601, a first concave plate long beam 602 and a corrugated concave plate grid 603. The corrugated concave plate 601 is symmetrically welded on both sides of the first concave plate long beam 602, and the corrugated concave plate grid 603 is arranged in the arc groove of the corrugated concave plate 601. The convex concave plate screen 7 includes a convex concave plate 701, a second concave plate long beam 702 and a convex concave plate grid 703. The convex concave plate 701 is symmetrically welded on both sides of the second concave plate long beam 702, and the convex concave plate grid 703 is arranged in the arc groove of the convex concave plate 701. The separation concave plate screen 8 includes a separation concave plate 801, a concave plate short beam 802 and a short circular tube grid 803. The separation concave plate 801 is symmetrically welded on both sides of the concave plate short beam 802, and the short circular tube grid 803 is arranged in the arc groove of the separation concave plate 801.

[0034] The corrugated concave plate grating 603 includes corrugated bars 6031 and first elongated tube bars 6032. The two kinds of bars are welded alternately and in parallel at the grooves of the corrugated concave plate 601 to form a corrugated threshing section. The convex concave plate grating 703 includes dense convex bars 7031, second elongated tube bars 7032 and sparse convex bars 7033. The three kinds of bars are welded in parallel at the grooves of the convex concave plate 701 in a combination of dense convex bars-elongated tubes-sparse convex bars-elongated tubes to form a convex threshing section. The short elongated tube bars 803 are welded in parallel at the grooves of the separation concave plate 801 to form a separation section.

[0035] The corrugated bars 6031 are hexagonal prism structures, and their edges are spirally twisted along the axial direction of the drum. The twisting direction is consistent with the rotation direction of the drum, which can effectively guide the corn ears to adjust to the threshing posture parallel to the axial direction of the drum. The edges are rounded to avoid excessive contact stress on the corn ears and cause grain breakage. The corrugated bars 6031 and the first long circular tube bars 6032 are alternately parallel to form corrugated concave plate bars 603, which avoids the corrugated bars being too dense and resulting in a decrease in grain screening efficiency, which is beneficial to improving the threshing quality and efficiency under conditions where the material flow thickness is large in the initial threshing stage.

[0036] The surface of the dense convex hull grid bar 7031 is welded with a convex hull structure, and every three convex hulls constitute a group of functional units. The length of each group is close to the length of the corn ear. The convex hulls of each group are evenly distributed on the surface of the grid bar, and the convex hulls are all oriented toward the axis direction of the threshing drum 4. The sparse convex hull grid bar 7033 is welded with the same convex hull, and every three convex hulls constitute a group of functional units. The length of each unit is close to the length of the corn ear. Each group of convex hulls is evenly distributed on the surface of the grid bar, and the convex hulls are all oriented toward the axis direction of the threshing drum 4. The distribution position corresponds to the interval area of ​​each group of units of the dense convex hull grid bar 7032 to form a spatial complementary structure. In this complementary convex hull structure, Under the present invention, the posture of the corn ear is gradually adjusted toward the axial direction of the drum during the backward movement, which effectively increases the contact area between the threshing rod 404 and the ear, thereby reducing the impact stress per unit area on the ear and effectively reducing the grain breakage rate. At the same time, the collision and friction between the corn ear and the convex hull structure causes some grains to fall off in advance, which significantly improves the threshing efficiency; the convex hull grid 703 effectively avoids the material accumulation caused by excessive convex hull resistance during the backward transportation of the material through the combined structure of "dense convex hull-circular tube-sparse convex hull-circular tube", ensures that the material moves quickly toward the tail end, and further improves the threshing quality and efficiency.

[0037] Working principle and process of the present invention:

[0038] See also Figures 1 to 7As shown, when in use, the corn ears enter the threshing device through the feed port shell 302, the threshing drum 4 is connected to the external power source through the drum spline shaft 401, and under the action of the external power source, the threshing drum 4 rotates, and the feeding head 402 transports the corn ears entering the threshing device backward, and first enters the corrugated threshing section composed of the threshing rod 404 and the corrugated concave plate screen 6, the corrugated concave plate screen 6 adopts corrugated bars 6031, and the edges of the corrugated bars 6031 are corrugated. The structure can effectively guide the corn ears to adjust to the threshing posture in the axial direction of the threshing drum 4, increase the contact area between the threshing rod 404 and the corn ears, disperse the impact per unit area, and reduce the grain breakage rate. At the same time, the corrugated concave plate screen 6 adopts a combination of corrugated bars 6031 and the first long round tube bars 6032 to avoid the corrugated bars being too dense and causing the grain screening efficiency to decrease. The ears continue to move backward and enter the convex hull threshing section composed of the threshing rod 404 and the convex hull concave plate screen 7. The concave plate screen 7 adopts convex hull bars, and its convex hull structure can effectively adjust the posture of corn ears, making it more suitable for threshing operations, and also has an auxiliary threshing function, thereby significantly improving the threshing efficiency and quality. The screen body uses a combination structure of "dense convex hull-circular tube-sparse convex hull-circular tube" to ensure the effect of adjusting the posture of the ears while avoiding the phenomenon of material accumulation caused by excessive convex hull resistance, ensuring that the material flow can pass quickly, further improving the threshing quality and efficiency. The ears continue to move backward and enter the separation section composed of threshing spikes 405 and the separation concave plate screen 8. During the threshing process, some corn kernels will be entrained into the bracts. When the bracts containing corn kernels are transported to the separation section, the threshing spikes 405 stir and separate the bracts containing corn kernels, so that the corn kernels are separated from the bracts. The corn kernels enter the collection device from the separation concave plate screen 8, and finally the bracts and the core shaft enter the impurity discharge section composed of the discharge plate 406 and the impurity discharge plate 9, and are quickly discharged to avoid material blockage.

[0039] The above embodiments are exemplary and should not be construed as limiting 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.

Claims

1. A corn ear threshing device with segmented and orderly feeding, characterized by: The present invention comprises a main beam (1), a roller bracket (2), a roller top cover (3), a threshing roller (4), a feeding head lower cover (5), a corrugated concave plate screen (6), a convex concave plate screen (7), a separation concave plate screen (8), a debris removal plate (9) and a concave plate screen adjustment mechanism (10), wherein two roller brackets (2) are fixedly arranged on a harvester frame, the main beam (1) is welded to both sides of the roller top cover (3), the roller top cover (3) is detachably arranged on the roller bracket (2) by bolts, the threshing roller (4) is rotatably arranged between the two roller brackets (2), and the feeding head lower cover (5) is arranged at the front end of the roller top cover (3) and the main beam (1). The corrugated concave plate screen (6) is arranged below the drum top cover (3) and is located at the rear of the feeding head lower cover (5). The corrugated concave plate screen (6) is connected to the main beam (1) through the concave plate screen adjustment mechanism (10). The convex concave plate screen (7) is arranged below the drum top cover (3) and is located at the rear of the corrugated concave plate screen (6). The convex concave plate screen (7) is connected to the main beam (1) through the concave plate screen adjustment mechanism (10). The separation concave plate screen (8) is arranged below the drum top cover (3) and is located at the rear of the convex concave plate screen (7). The separation concave plate screen (8) is connected to the main beam (1). The impurity removal plate (9) is arranged at the tail of the separation concave plate screen (8); The threshing drum (4) comprises a drum spline shaft (401), a feeding head (402), a drum body (403), a threshing rod (404), threshing spikes (405), a discharge plate (406) and a drum shaft (407). The feeding head (402) is composed of a conical outer shell and spiral blades welded to the outer shell. The feeding head (402) is arranged at the front end of the drum body (403). The drum spline shaft (401) is arranged at the feeding head (402). At the front end, the threshing rod (404) is axially and spirally arranged in the front middle section of the cylinder (403), the threshing spikes (405) are axially and spirally arranged in the rear section of the cylinder (403), the discharge plate (406) is circumferentially distributed at the rear end of the cylinder (403), the roller shaft (407) is arranged at the rear end of the cylinder (403), and the threshing roller (4) is rotatably arranged between the two roller brackets (2) through the roller spline shaft (401) and the roller shaft (407); The corrugated concave plate screen (6) comprises a corrugated concave plate (601), a first concave plate long beam (602) and a corrugated concave plate grid bar (603), wherein the corrugated concave plate (601) is arranged on both sides of the first concave plate long beam (602), and the corrugated concave plate grid bar (603) is rotatably arranged in the arc groove of the corrugated concave plate (601), and the first concave plate long beam (602) is connected to the main beam (1) via the concave plate screen adjustment mechanism (10). The corrugated concave plate screen (6) and the threshing rods (404) axially spirally arranged on the cylinder (403) constitute a corrugated threshing section; The convex hull concave plate screen (7) comprises a convex hull concave plate (701), a second concave plate long beam (702) and a convex hull concave plate grating (703); the convex hull concave plate (701) is arranged on both sides of the second concave plate long beam (702); the convex hull concave plate grating (703) is arranged in the arc groove of the convex hull concave plate (701); the second concave plate long beam (702) is connected to the main beam (1) via the concave plate screen adjustment mechanism (10); the convex hull concave plate screen (7) and the threshing rods (404) axially spirally arranged on the cylinder (403) constitute a convex hull threshing section; A first long beam lug (6021) is welded to one side of the first concave plate long beam (602), and the first long beam lug (6021) is connected to the main beam (1) via the concave plate screen adjustment mechanism (10); the corrugated concave plate grating (603) comprises a corrugated grating (6031) and a first long round tube grating (6032), and the two gratings are welded alternately and in parallel at the groove of the corrugated concave plate (601); the corrugated grating (6031) is a hexagonal prism, and the edges are twisted spirally along the axial direction of the drum, and the twisting direction is consistent with the rotation direction of the drum, and the edges are rounded; A second long beam lug (7021) is welded on one side of the second concave plate long beam (702), and the second long beam lug (7021) is connected to the main beam (1) through the concave plate screen adjustment structure (10); the convex concave plate grid bar (703) includes a dense convex grid bar (7031), a second long round tube grid bar (7032) and a sparse convex grid bar (7033), and the three grid bars are parallel welded in the groove of the convex concave plate (701) in the form of a combination of dense convex, long round tube, sparse convex and long round tube. The surface of the dense convex grid bar (7031) is welded with a convex structure, and every three The convex hulls form a group of functional units, the length of each group of units matches the length of the corn ear, each group of convex hulls is evenly distributed on the surface of the bars, and the convex hulls are all oriented toward the axis direction of the threshing drum (4). The sparse convex hull bars (7033) are welded with the same convex hulls, and every three convex hulls form a group of functional units, the length of each group of units matches the length of the corn ear, each group of convex hulls is evenly distributed on the surface of the bars, and the convex hulls are all oriented toward the axis direction of the threshing drum (4). The distribution position corresponds to the interval area of ​​each group of units of the dense convex hull bars (7031) to form a spatial complementary structure.

2. A corn ear threshing device with segmented and orderly feeding according to claim 1, characterized in that: The drum top cover (3) comprises a top cover shell (301), a feed inlet shell (302) and top cover side plates (303); the drum top cover (3) is arranged directly above the threshing drum (4); the feed inlet shell (302) is arranged directly above the feed head (402); and the top cover side plates (303) are arranged on both sides of the top cover shell (301) and are connected to the drum bracket (2) via bolts.

3. The corn ear threshing device with segmented and orderly feeding according to claim 2 is characterized in that: The separation concave plate screen (8) comprises a separation concave plate (801), a concave plate short beam (802) and short circular tube bars (803); the separation concave plate (801) is arranged on both sides of the concave plate short beam (802); the short circular tube bars (803) are arranged in the arc groove of the separation concave plate (801); the separation concave plate screen (8) and the threshing spikes (405) axially spirally arranged on the cylinder (403) constitute a separation section.

4. The corn ear threshing device with segmented and orderly feeding according to claim 3 is characterized in that: The impurity removal plate (9) separates the tail end of the concave plate screen (8) and is connected to the separation concave plate (801). The impurity removal plate (9) and the discharge plate (406) circumferentially distributed at the tail end of the cylinder (403) form an impurity removal section.

5. The corn ear threshing device with segmented and orderly feeding according to claim 4 is characterized in that: The concave plate screen adjustment mechanism (10) comprises a push rod fixing frame (1001) and an electric push rod (1002), wherein the push rod fixing frame (1001) is fixed to the main beam (1) by means of bolts, and the electric push rod (1002) is fixed to the hanging ears of the push rod fixing frame (1001) by means of bolts, and the extension rod of the electric push rod (1002) is connected to the first long beam hanging ear (6021) and the second long beam hanging ear (7021) in a hinged manner.

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