Threshing section gap adjustable double axial flow cylinder

Abstract

This invention discloses a double longitudinal axial flow drum with adjustable threshing section gap, including a threshing section gap adjustment mechanism, a concave sieve, a cover plate, a double longitudinal axial flow drum, and a frame. The threshing section gap adjustment mechanism includes a rotating fixed rod, a bevel gear system, a rotating main shaft bearing seat, a rotating fixed block, a bearing assembly, a cam storage box, a cam, a motor transmission gear, a rotating main shaft, and a cam top cover. The double longitudinal axial flow drum with adjustable threshing section gap uses a servo motor to drive the cam to perform circumferential motion, which is converted into the up-and-down motion of the grid-type concave plate. This changes the gap between the grid-type concave plate and the flexible short-grooved variable-diameter threshing drum, realizing accurate adjustment of the local threshing gap of the double longitudinal axial flow drum. It adapts to real-time changes in crops with different moisture contents, feed rates, and drum speeds, reducing the grain breakage rate.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery technology, and relates to low-loss and high-efficiency harvesting technology and equipment, specifically to a double longitudinal axial flow drum with adjustable gap between the threshing sections. Background Technology

[0002] After the crop is fed into the threshing drum, the threshing drum rotates at high speed. The threshing elements continuously strike and knead the material. Through the combined action of the high-speed rotating drum threshing elements and the guide plate, the crop moves axially spirally from the feeding inlet to the discharge outlet along the concave plate. The grains fall onto the vibrating screen surface through the concave plate screen, while the husks, stems, and other debris are thrown out through the discharge outlet and discharged from the threshing system.

[0003] Most existing threshing drums have a fixed threshing gap. Current methods for adjusting this gap typically involve manually adjusting shims or using a hydraulic system to move the concave plate, thus altering the relative position between the drum and the concave plate. However, this manual adjustment method is ill-suited to real-time changes in drum speed and feed rate during actual harvesting. The inability to automatically adjust the threshing gap leads to high breakage rates and makes it difficult to meet the demands of intelligent harvesting operations in complex farmland environments.

[0004] Most existing threshing gap adjustment devices are integrated, which has disadvantages such as low precision, high energy consumption, and high maintenance costs. Summary of the Invention

[0005] The first technical problem this invention aims to solve is that the threshing gap of most existing threshing drums is fixed. Existing methods for adjusting the threshing gap generally involve manually adjusting shims or using a hydraulic system to move the concave plate, thereby changing the relative position between the threshing drum and the concave plate. During harvesting, manual adjustment is difficult to adapt to real-time changes in drum speed and feed rate, is time-consuming and labor-intensive, and easily causes inconsistent variations in the concave plate gap along the drum's axial direction, resulting in high grain breakage rates, uneven threshing, and increased risk of blockage.

[0006] The second technical problem to be solved by the present invention is that the threshing gap of the current double longitudinal axial flow drum threshing section is difficult to adjust, and the adjustment accuracy of the integrated threshing gap adjustment device is low, which makes it impossible to accurately control the threshing gap, affecting the threshing effect and causing grain loss. Moreover, the integrated threshing gap adjustment device has high energy consumption and high maintenance cost.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0008] A double longitudinal axial flow drum with adjustable threshing section gap includes a threshing section gap adjustment mechanism, a double longitudinal axial flow drum, a concave sieve, a cover plate, and a frame.

[0009] The threshing section gap adjustment mechanism includes a rotating fixed rod, a bevel gear system, a rotating main shaft bearing seat, a rotating fixed block, a bearing assembly, a cam storage box, a cam, a motor drive gear, a rotating main shaft, and a cam top cover. The cam, motor drive gear, and the driving wheel in the bevel gear system are connected to the rotating main shaft by a key. The rotating fixed block and the rotating main shaft bearing seat are both welded to the frame below the grid-type concave plate. The cam top cover has a cam groove, and there is a line contact between the cam and the cam groove. There is a surface contact between the cam top cover push rod and the groove on the edge of the grid-type concave plate. The threshing section gap adjustment range of the threshing section gap adjustment mechanism is 5-45mm.

[0010] The concave sieve includes a feeding section concave plate, a grid-type concave plate, a separation section concave plate, and a waste discharge section concave plate. The feeding section concave plate, the separation section concave plate, and the waste discharge section concave plate are fixed to the frame by bolts. The threshing gap between the grid-type concave plate and the flexible short-ribbed variable-diameter threshing drum decreases sequentially from the small end to the large end of the drum.

[0011] The cover plate includes a spiral feed head cover plate, a variable diameter threshing drum cover plate, a separation section cover plate, and a waste discharge section cover plate; the spiral feed head cover plate, the separation section cover plate, the waste discharge section cover plate, and their corresponding concave plates are fixed to the frame by bolts; the fixing rod on the variable diameter threshing drum cover plate is fixed to the frame by bolts.

[0012] The dual longitudinal axial flow threshing drum includes a spiral feed head, a flexible short-grooved rod variable-diameter threshing drum, a spike-tooth threshing drum, and a waste removal section drum. The sections of the dual longitudinal axial flow threshing drum are connected by welding, and the threshing elements are spirally arranged on the drum. The spiral feed head has 2-3 spiral heads, a friction angle ranging from 20° to 40°, and a length ranging from 350-400 mm. The flexible short-grooved rod variable-diameter threshing drum has flexible short-grooved rod threshing elements installed by bolts, with a length ranging from 750-800 mm. The spike-tooth threshing drum has a length ranging from 900-1000 mm, and the spike-tooth threshing elements are welded onto the drum. The waste removal section drum has a welded straw removal plate with a length ranging from 200-250 mm.

[0013] The concave sieves corresponding to the two rollers on both sides of the double longitudinal axial flow roller are installed separately and arranged symmetrically. The concave plate connecting rod passes through the concave plate connecting hole to connect the concave plate sieves on both sides.

[0014] The feeding section concave plate is welded with a baffle; the outer diameter of the circular tube screen bar is designed to be 10-12mm, the thickness of the arc plate is 10-12mm, and the circular tube screen bar and the arc plate are welded alternately to form a separation section concave plate; the length of the concave plate screen is equal to the length of the corresponding section roller, and the wrap angle of the concave plate is 145°-180°.

[0015] The cover plate is designed as an integral piece, with a single-sided concave plate encircling angle ranging from 145° to 180°; a guide plate is welded onto the separation section cover plate, with a rise angle ranging from 20° to 50°.

[0016] The top of the rotating fixing rod is welded with a support plate, which is in surface contact with the grid-type concave plate and plays a supporting role. The lower end of the rotating fixing rod is connected to the rotating fixing block through a bearing, and the driven bevel gear is installed with an interference fit to the rotating fixing rod.

[0017] The diameter of the large end of the spiral feed head is 300-350mm, and its large end diameter is the same as the small end diameter of the flexible short-groove rod variable diameter threshing drum; the diameter of the flexible short-groove rod variable diameter threshing drum varies from 50-100mm; the diameter of the spike-tooth threshing drum is 350-450mm; and the diameter of the impurity discharge section drum is 350-450mm.

[0018] The length of the concave plate in the feeding section is 150-250mm longer than that of the spiral feed head.

[0019] The beneficial effects of this invention are mainly reflected in the following aspects:

[0020] 1. The threshing section gap adjustment mechanism uses a servo motor to drive the cam to achieve circular motion, which in turn drives the cam top cover to move up and down. The cam top cover supports the grid-type concave plate to move up and down, completing the gap adaptive adjustment. Compared with the traditional manual adjustment method or the overall threshing gap adjustment mechanism, it reduces the difficulty of adjusting the threshing gap in the threshing section and improves the threshing effect.

[0021] 2. The threshing section gap adjustment mechanism can independently adjust the threshing gap between the elastic short-groove variable diameter threshing drum and the grid-type concave plate, which is conducive to accurately controlling the threshing gap, enhancing the further striking and kneading effect of the threshing elements in the second half on the difficult-to-thresh grains, reducing the grain breakage rate. Moreover, compared with the overall threshing gap adjustment mechanism, the threshing section gap adjustment mechanism reduces the power consumption of the whole machine, and is easy to disassemble when the drum is blocked, making it convenient for maintenance. Attached Figure Description

[0022] Figure 1 This is an isometric view of the entire double longitudinal axial flow drum with adjustable gap in the threshing section.

[0023] Figure 2 This is an isometric drawing of the rackless assembly.

[0024] Figure 3 This is an isometric drawing of the entire assembly without a frame or cover.

[0025] Figure 4 This is a structural diagram of a double longitudinal axial flow drum.

[0026] Figure 5 This is a structural diagram of the cover plate.

[0027] Figure 6 This is a structural diagram of the spiral feed head cover.

[0028] Figure 7 This is a structural diagram of the variable diameter threshing drum cover.

[0029] Figure 8 This is a structural diagram of the separation section cover plate.

[0030] Figure 9 This is a structural diagram of the separation section cover plate.

[0031] Figure 10 This is a structural diagram of the waste removal section cover.

[0032] Figure 11 This is a structural diagram of the waste removal section cover.

[0033] Figure 12 This is an isometric view of the combination of the threshing section gap adjustment mechanism and the concave plate.

[0034] Figure 13 This is a structural diagram of the feed section concave plate.

[0035] Figure 14 This is a structural diagram of a grid-type concave plate.

[0036] Figure 15 This is a structural diagram of a grid-type concave plate.

[0037] Figure 16 This is a structural diagram of the concave plate of the separation section.

[0038] Figure 17 This is a structural diagram of the concave plate in the waste removal section.

[0039] Figure 18 This is an isometric view of the combination of the threshing section gap adjustment mechanism and the grid-type concave plate.

[0040] Figure 19 This is a structural diagram of the gap adjustment mechanism in the threshing section.

[0041] Figure 20 This is a structural diagram of the threshing section gap adjustment mechanism for removing the cam-type storage box.

[0042] Figure 21 This is a structural diagram of the cam top cover.

[0043] Figure 22 This is a structural diagram of the rotating fixed rod.

[0044] In the diagram, 1-Threshing section gap adjustment mechanism, 2-Frame, 3-Concave plate screen, 4-Cover plate, 5-Double longitudinal axial flow drum, 11-Rotating fixing rod, 111-Support plate, 112-Bearing end cover, 12-Bevel gear system, 121-Driving bevel gear, 122-Driven bevel gear, 13-Rotating main shaft bearing seat, 14-Rotating fixing block, 15-Bearing assembly, 16-Cam storage box, 17-Rotating main shaft, 18-Cam top cover, 181-Cam groove, 19-Cam, 20-Motor transmission gear, 31-Feeding section concave plate, 32-Grid-type concave plate, 3 21-Groove, 33-Separation section concave plate, 331-Circular tube screen bar, 332-Arc plate, 34-Impure discharge section concave plate, 35-Concave plate connecting rod, 36-Concave plate connecting hole, 41-Spiral feed head cover plate, 42-Variable diameter threshing drum cover plate, 421-Fixing rod, 43-Separation section cover plate, 431-Guide plate, 44-Impure discharge section cover plate, 51-Spiral feed head, 52-Elastic short-grooved rod variable diameter threshing drum, 521-Elastic short-grooved rod threshing element, 53-Spiked tooth threshing drum, 531-Spiked tooth threshing element, 54-Impure discharge section drum, 541-Grass discharge plate. Detailed Implementation

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. To avoid excessive and unnecessary detail, well-known structures or functions will not be described in detail in the following embodiments. The approximate language used in the following embodiments can be used for quantitative descriptions, indicating that a certain variation in quantity is permissible without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this invention pertains.

[0046] like Figure 1 As shown, the dual longitudinal axial flow drum partial threshing gap adjustment device includes a threshing section gap adjustment mechanism 1 and a frame 2. The base of the threshing section gap adjustment mechanism 1 is fixed to the frame 2 by welding.

[0047] like Figure 2 As shown, the frameless integrated device includes a threshing section gap adjustment mechanism 1, a concave sieve 3, a cover plate 4, and a double longitudinal axial flow drum 5.

[0048] like Figure 3 As shown, the dual longitudinal axial flow drum 5 includes a spiral feed head 51, an elastic short-grooved variable diameter threshing drum 52, a spike-tooth threshing drum 53, and a waste removal section drum 54, which are connected by welding.

[0049] like Figure 4 As shown, the elastic short-groove threshing drum 52 is equipped with an elastic short-groove threshing element 521; the nail-tooth threshing element 531 is directly welded to the nail-tooth threshing drum 53; the waste removal section drum 54 is composed of a cylindrical drum welded with a straw removal plate 541.

[0050] like Figure 5 As shown, the cover plate includes a spiral feed head cover plate 41, a variable diameter threshing drum cover plate 42, a separation section cover plate 43, and a waste discharge section cover plate 44.

[0051] like Figure 6 As shown, the spiral feed head cover plate 41 is an integral piece with a smooth inner surface. It is mainly used to block the material flow so that it can be fed backward with the spiral feed head.

[0052] like Figure 7 As shown, the variable diameter threshing drum cover plate 42 is an integral piece with a smooth inner surface, allowing the material flow to achieve flexible threshing within this area. The fixing rod 421 on the variable diameter threshing drum cover plate 42 is fixed to the frame 2 by bolts.

[0053] like Figure 8 As shown, the separating section cover plate 43 is matched with the toothed threshing drum 53, and the separating section cover plate 43 is an integral piece.

[0054] like Figure 9 As shown, since the spiked tooth threshing drum 53 does not have the effect of material flow conveying, as a preferred option, the separation section cover plate 43 is provided with a guide plate 431 to realize the function of guiding and conveying the material in this area. The rise angle of the guide plate is 20°-50°.

[0055] like Figure 10 As shown, the waste removal section cover plate 44 adopts a layered perforated structure.

[0056] like Figure 11 As shown, a baffle is welded to one side of the waste discharge section cover plate 44.

[0057] like Figure 12 As shown, the concave plate screen 3 adopts a combined concave plate form, including a feeding section concave plate 31, a grid-type concave plate 32, a separation section concave plate 33, and a waste removal section concave plate 34; the concave plate screen 3 is a standalone type with a symmetrical structure, and the concave plate connecting rod 35 passes through the concave plate connecting hole 36 to connect the concave plate screens 3 on both sides.

[0058] like Figure 13 As shown, the inner surface of the feeding section concave plate 31 is smooth. A baffle is welded to the front end of the concave plate, and the length of the concave plate is greater than the length of the spiral feed head 51. This facilitates the smooth feeding of material from the spiral feed head to the rear with a large feeding volume, avoiding blockage, and the material flow in the concave plate does not overflow from the front end.

[0059] like Figure 14 As shown, the grid-type concave plate 32 adopts a grid-type structure, mainly composed of side arc plates, horizontal grid plates, sieve bars, etc.

[0060] like Figure 15As shown, the edge of the grid-type concave plate 32 has a groove 321, and the top rod of the cam top cover 18 is in surface contact with the groove 321 on the edge of the grid-type concave plate 32.

[0061] like Figure 16 As shown, the separating section concave plate 33 is composed of circular tube screen bars 331 with an outer diameter of 10-12mm and arc plates 332 with a thickness of 10-12mm, which are staggered vertically. This avoids the horizontal grid plate from being higher than the screen bars, reduces the collision effect on the grains, reduces the breakage rate, and increases the gap between the screen bars, which is conducive to the separation of grains.

[0062] like Figure 17 As shown, the concave plate 34 of the debris discharge section adopts a layered perforated type. Its function is to act as a boundary to assist the grass discharge plate in discharging debris such as core rods, collect residual grains on the core rods, and the dislodged grains enter the cleaning device through the perforation, and finally enter the collection box through the grain conveying pipe.

[0063] The feeding section concave plate 31, the separating section concave plate 33, and the waste discharge section concave plate are respectively matched with the spiral feed head cover plate 41, the separating section cover plate 43, and the waste discharge section cover plate 44 and are fixed on the frame 2 by bolt connection. The gap between these concave plates and the cover plates is fixed.

[0064] The upper end of the variable diameter threshing drum cover plate 42 is fixed to the frame 2, and the lower end has no matching relationship with the grid-type concave plate 32, so it does not affect the adjustment of the threshing gap during operation.

[0065] like Figure 18 As shown, the threshing section gap adjustment mechanism 1 is located below the grid-type concave plate 32, and the top of the cam top cover 18 push rod is in surface contact with the groove 321 on the edge of the grid-type concave plate 32.

[0066] The rotating fixed block 14 of the threshing section gap adjustment mechanism 1 is welded to the rotating spindle bearing seat 13 on the frame 2 below the grid-type concave plate 32.

[0067] like Figure 19 As shown, the threshing section gap adjustment mechanism 1 includes a rotating fixed rod 11, a bevel gear system 12, a rotating main shaft bearing seat 13, a rotating fixed block 14, a bearing assembly 15, a cam storage box 16, a cam 19, a motor drive gear 20, a rotating main shaft 17, and a cam top cover 18; the cam 19, the motor drive gear 20, and the drive wheel in the bevel gear system 12 are connected to the rotating main shaft 17 by a key; the rotating fixed block 14 is welded to the rotating main shaft bearing seat 13 on the frame 2; the cam top cover 18 and the cam groove 181 are in line contact.

[0068] The threshing section gap adjustment mechanism 1 adjusts the threshing gap between the grid-type concave plate 32 and the elastic short-groove variable-diameter threshing drum 52 according to the material feeding amount in the variable-diameter threshing drum area, thereby achieving a better overall threshing effect.

[0069] The threshing gap adjustment distance is divided into two levels. Each level adjustment requires the servo motor to rotate by one rotation angle. The servo motor drives the motor transmission gear 20 to rotate in the cam storage box 16, which in turn drives the rotating main shaft 17 to rotate. The cam 19 and the drive wheel of the bevel gear system 12 are connected to the rotating main shaft 17. The rotation of the rotating main shaft 17 drives the cam 19 to rotate by the corresponding angle, which in turn pushes the cam top cover 18 to move up and down. The cam top cover 18 supports the grid-type concave plate 32 to complete the gap adjustment. At the same time, the bevel gear system 12 drives the rotating fixed rod 11 to rotate. The support plate 111 on the rotating fixed rod 11 fixes the adjusted grid-type concave plate 32.

[0070] The cam 19 and the cam groove 181 at the corresponding position of the cam top cover 18 are in line contact. The top cover rod contacts the groove 321 on the edge of the grid-type concave plate 32, converting the circumferential motion of the cam into the up-and-down motion of the top cover, thereby realizing the gap adjustment.

[0071] like Figure 21 As shown, a cam groove 181 is provided on the cam top cover 18.

[0072] like Figure 22 As shown, the rotating fixing rod 11 is the actuator for fixing the grid-type concave plate 32 after gap adjustment; a support plate 111 supporting the grid-type concave plate 32 is welded above the rotating fixing rod 11. During the process of the grid-type concave plate 32 rising or falling, the rotating main shaft 17 drives the rotating fixing rod 11 to move synchronously through the bevel gear system 12. At this time, the spiral support plate 111 will move synchronously with the movement trajectory of the grid-type concave plate 32, thereby achieving the fixing effect.

[0073] The working process of a double longitudinal axial flow drum with adjustable threshing section gap:

[0074] During operation, the spiral feed head 51 conveys the material backward in an orderly manner. When the feeding amount changes (increases or decreases), the servo motor drives the motor transmission gear 20 to rotate in the cam receiving box 16, which in turn drives the rotating main shaft 17 to rotate. The rotating main shaft 17 drives the cam 19 to rotate at the corresponding angle, which in turn pushes the cam top cover 18 to move up and down. The cam top cover 18 supports the grid-type concave plate 32 to move up and down, completing the local adjustment of the threshing gap. This achieves the function of increasing the threshing gap when the feeding amount is large and decreasing the threshing gap when the feeding amount is small. The crop is threshed and conveyed backward under the action of the elastic short-ribbed variable diameter threshing drum 52 and the grid-type concave plate 32. Subsequently, the material is impacted and separated under the action of the spike-tooth threshing drum 53 and the separation section concave plate 33, further removing the difficult-to-thresh grains. Finally, the impurities are discharged through the impurity removal section.

[0075] The embodiments of the present invention have been described in detail above. These embodiments are merely preferred implementations of the present invention, but the present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, or improvements made within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A double longitudinal axial flow drum with adjustable threshing section gap, comprising a threshing section gap adjustment mechanism (1), a double longitudinal axial flow drum (5), a concave sieve (3), a cover plate (4), and a frame (2), characterized in that: The threshing section gap adjustment mechanism (1) includes a rotating fixed rod (11), a bevel gear system (12), a rotating main shaft bearing seat (13), a rotating fixed block (14), a bearing assembly (15), a cam storage box (16), a cam (19), a motor drive gear (20), a rotating main shaft (17), and a cam top cover (18). The cam (19), the motor drive gear (20), and the active bevel gear (121) in the bevel gear system (12) are connected to the rotating main shaft (17) by a key. The rotating fixed block (14) and the rotating main shaft bearing seat (13) are both welded to the frame (2) below the grid-type concave plate (32). The cam top cover (18) has a cam groove (181), and there is a line contact between the cam (19) and the cam groove (181). There is a surface contact between the push rod of the cam top cover (18) and the groove (321) on the edge of the grid-type concave plate (32). The threshing section gap of the adjustment mechanism (1) is adjusted to be 5-45mm. The concave sieve (3) includes a feeding section concave plate (31), a grid-type concave plate (32), a separation section concave plate (33), and a waste discharge section concave plate (34); the feeding section concave plate (31), the separation section concave plate (33), and the waste discharge section concave plate (34) are fixed to the frame (2) by bolts; the threshing gap between the grid-type concave plate (32) and the elastic short-ribbed variable-diameter threshing drum (52) decreases sequentially from the small end to the large end of the drum; The cover plate (4) includes a spiral feed head cover plate (41), a variable diameter threshing drum cover plate (42), a separation section cover plate (43), and a waste discharge section cover plate (44); the spiral feed head cover plate (41), the separation section cover plate (43), the waste discharge section cover plate (44), and their corresponding concave plates are fixed to the frame (2) by bolts; the fixing rod (421) on the variable diameter threshing drum cover plate (42) is fixed to the frame (2) by bolts; The dual longitudinal axial flow drum (5) includes a spiral feed head (51), an elastic short-groove rod variable diameter threshing drum (52), a spike-tooth threshing drum (53), and a waste removal section drum (54). The sections of the dual longitudinal axial flow drum (5) are connected by welding, and the threshing elements are spirally arranged on the drum. The spiral feed head (51) has 2-3 spiral heads, a friction angle range of 20°-40°, and a length of 350-400mm. The elastic short-groove rod variable diameter threshing drum (52) is bolted to install the elastic short-groove rod threshing elements (521), with a length of 750-800mm. The spike-tooth threshing drum (53) has a length of 900-1000mm, and the spike-tooth threshing elements (531) are welded on the drum. The waste removal section drum (54) is welded with a straw removal plate (541), with a length of 200-250mm. The top of the rotating fixing rod (11) is welded with a support plate (111). The support plate (111) is in surface contact with the grid-type concave plate (32) and plays a supporting role. The lower end of the rotating fixing rod (11) is connected to the rotating fixing block (14) through a bearing. The driven bevel gear (122) is installed with an interference fit with the rotating fixing rod (11).

2. A threshing inter- segment gap adjustable dual axial flow cylinder as claimed in claim 1 wherein, The concave sieves (3) corresponding to the rollers on both sides of the double longitudinal axial flow roller (5) are installed separately and arranged symmetrically. The concave plate connecting rod (35) passes through the concave plate connecting hole (36) to connect the concave plate sieves (3) on both sides.

3. The threshing inter- segment gap adjustable dual axial flow cylinder as claimed in claim 1 wherein, The feeding section concave plate (31) is welded with a baffle; the outer diameter of the circular tube screen bar (331) is designed to be 10-12mm, and the thickness of the arc plate (332) is 10-12mm. The circular tube screen bar (331) and the arc plate (332) are welded alternately to form the separation section concave plate (33); the screen plate length of the concave plate screen (3) is equal to the length of the corresponding section roller, and the concave plate wrap angle range is 145°-180°.

4. The threshing inter- segment gap adjustable dual axial flow cylinder as claimed in claim 1 wherein, The cover plate (4) is designed as an integral piece, and the wrap angle of its single-sided concave plate is 145°-180°; the guide plate (431) is welded on the separation section cover plate (43), and the rise angle of the guide plate (431) is 20°-50°.

5. The threshing inter- segment gap adjustable dual axial flow cylinder as claimed in claim 1 wherein, The diameter of the large end of the spiral feed head (51) is 300-350mm, and its large end diameter is the same as the small end diameter of the elastic short-groove rod variable diameter threshing drum (52); the diameter of the elastic short-groove rod variable diameter threshing drum (52) varies from 50-100mm; the diameter of the nail-tooth threshing drum (53) is 350-450mm; and the diameter of the impurity discharge section drum is 350-450mm.

6. The threshing inter- segment gap adjustable dual axial flow cylinder as claimed in claim 1 wherein, The length of the feeding section concave plate (31) is 150-250 mm longer than that of the spiral feed head (51).

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