Double-roller threshing device for white radish seed harvesting

Abstract

The application provides a double-roller threshing device for white radish seed harvesting, which comprises two left and right opposite side plates, two upper and lower threshing roller assemblies arranged between the two opposite side plates, and an upper threshing roller assembly comprising a first threshing roller and a second threshing roller. A separable transmission structure is arranged between the first threshing roller and the second threshing roller, and the separable transmission structure can make the first threshing roller and the second threshing roller engage or separate when rotating in a forward direction or a reverse direction. Three driving assemblies can make the first threshing roller, the second threshing roller and a lower threshing roller assembly rotate independently. The distance between the two threshing roller assemblies can be adjusted through a lifting mechanism. The upper threshing roller assembly in the application is a sectional threshing roller, and the rotating speed and direction of the two threshing rollers can be controlled independently. When the rollers are blocked, the situation can be solved by independently controlling the rotating speed and direction of the two sectional threshing rollers.

Description

Technical Field

[0001] This invention relates to the field of drum threshing technology, specifically a double-drum threshing device for harvesting white radish seeds. Background Technology

[0002] White radish is a biennial plant belonging to the Brassicaceae family. At harvest time, the pods are long and silique-shaped, and the seeds are nearly conical with high firmness. Currently, most regions in my country still use traditional manual threshing methods for white radish seeds, which is labor-intensive, time-consuming, and prone to seed breakage during the threshing process. White radish seeds mature asynchronously, specifically, the upper part of the pod matures first, followed by the lower part. After manual harvesting and drying, centralized threshing can begin. Therefore, it is necessary to utilize threshing equipment for this task.

[0003] Current threshing devices mainly consist of a threshing drum, a concave sieve, and a top cover. When threshing, radish stalks are fed into the device. Under the high-speed impact of the threshing drum, the stalks are squeezed, kneaded, combed, and collided with the concave sieve to achieve threshing. Simultaneously, the stalks undergo axial movement under the action of the concave sieve and the top cover. The threshed seeds separate from the concave sieve holes and proceed to subsequent cleaning, while a large amount of intact stalks are discharged from the machine. During harvesting, the load on the threshing drum varies depending on the feed amount, which can lead to a decrease in threshing performance and, in severe cases, even blockage and shutdown.

[0004] Therefore, it is necessary to propose a threshing device that can not only solve the problem of clogging and shorten the threshing time, but also reduce the damage to the grains. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a double-drum threshing device for harvesting white radish seeds. The upper threshing drum assembly in this invention is a segmented threshing drum, and the rotation speed and direction of the two threshing drums can be controlled independently. This allows the blockage to be resolved by individually controlling the rotation speed and direction of the two threshing drums when the drums become clogged.

[0006] To achieve the above objectives, the specific solution adopted by the present invention is as follows:

[0007] A double-drum threshing device for harvesting white radish seeds includes:

[0008] The housing provides installation and threshing space, and the housing includes two side panels arranged opposite to each other on the left and right sides;

[0009] Two threshing roller assemblies are distributed vertically between two opposite side plates and can rotate independently. The two threshing roller assemblies cooperate to squeeze the radish stalks and thresh the radish. The upper threshing roller assembly includes a mounting shaft with its two ends passing through the corresponding side plates, and a first threshing roller and a second threshing roller that are distributed horizontally on the mounting shaft. A separable transmission structure is provided between the first threshing roller and the second threshing roller. When the separable transmission structure rotates in the forward direction, it can make the first threshing roller and the second threshing roller mesh together, and when it rotates in the reverse direction, it can make the first threshing roller and the second threshing roller separate.

[0010] The drive mechanism includes a first drive assembly for controlling the rotation of the first threshing drum, a second drive assembly for controlling the rotation of the second threshing drum, and a third drive assembly for controlling the rotation of the lower threshing drum assembly; the three drive assemblies enable the first threshing drum, the second threshing drum, and the lower threshing drum assembly to rotate independently.

[0011] The lifting mechanism is used to adjust the distance between the two threshing drum assemblies.

[0012] Furthermore, both the first threshing drum and the second threshing drum include an inner cylinder, an outer cylinder coaxially fitted outside the inner cylinder, and two arc-shaped plates arranged opposite each other to seal the space between the inner and outer cylinders. The end of the inner cylinder near the side plate extends to the outside of the side plate. A separable transmission structure is provided between the arc-shaped plates arranged opposite each other in the first threshing drum and the second threshing drum, including a first ratchet tooth and a second ratchet tooth. The first ratchet tooth is circumferentially distributed on the right end face of the inner cylinder in the first threshing drum, and the second ratchet tooth is circumferentially distributed on the left end face of the inner cylinder in the second threshing drum.

[0013] Furthermore, springs are also installed on the inner cylinders of the first and second threshing drums, with the two ends of the springs abutting against the arc-shaped plate and the adjacent side plate, respectively.

[0014] Furthermore, the outer cylinder of the first threshing drum has a plurality of spirally distributed first plate teeth on its circumferential surface, the outer cylinder of the second threshing drum has a plurality of first rod teeth on its circumferential surface, and the lower threshing drum assembly has spiral blades, spirally distributed second plate teeth, and a plurality of second rod teeth, wherein the spiral blades and the second plate teeth are both located on the left section.

[0015] Furthermore, both opposite side plates are provided with waist-shaped holes, through which the inner cylinders of the first and second threshing rollers extend to the outside of the box body.

[0016] Furthermore, the lifting mechanism includes a seated bearing, a hydraulic cylinder, a controller, and several thin-film pressure sensors. The seated bearing is mounted on the portion of the inner cylinder extending to the outside of the housing. The hydraulic cylinder is mounted on the side plate, and its piston rod is connected to the seated bearing. The thin-film pressure sensors are located on the outer circumferential surface of the first threshing drum and the outer circumferential surface of the left section of the lower threshing drum assembly. The controller receives pressure values ​​collected by the several thin-film pressure sensors, calculates the average pressure value based on the pressure values, and analyzes whether the average pressure value falls within the set pressure range. When the average pressure value exceeds the set pressure range, the controller can control the hydraulic cylinder electrically connected to it to operate. The hydraulic cylinder can control the lifting and lowering of the upper threshing drum assembly, thereby adjusting the distance between the two threshing drum assemblies.

[0017] Furthermore, a U-shaped limiting plate is provided on the outer surface of the side plate. The free ends of the two parallel side walls of the U-shaped limiting plate are fixedly connected to the outer surface of the side plate. The inner wall of the U-shaped limiting plate is in clearance fit with the outer circumference of the bearing with seat, thereby limiting the front and rear displacement of the inner cylinder. A through groove is provided on the bottom wall of the U-shaped limiting plate for the inner cylinder to pass through.

[0018] Furthermore, the lower threshing drum assembly includes an inner cylinder, an outer cylinder coaxially fitted outside the inner cylinder, and two arc-shaped plates arranged opposite each other to seal the space between the inner and outer cylinders. The first drive assembly, the second drive assembly, and the third drive assembly each include a motor located on the front or rear side of the housing, and a belt drive unit connected to the motor and the inner cylinder. One of the pulleys in the belt drive unit is mounted on the inner cylinder and located on the side of the U-shaped limiting plate away from the belt bearing.

[0019] Furthermore, in addition to two side plates distributed on the left and right, the box also includes two baffles distributed in the front and back, a guide plate located above and a concave screen located below. The baffles are provided with material inlets for straw to enter or exit; the guide plate has an outwardly convex arc-shaped structure and blades on its inner side to realize the rightward conveying of straw; the concave screen has an inwardly concave arc-shaped structure and adopts a grid screen.

[0020] Beneficial effects:

[0021] (1) The upper threshing drum assembly in this invention is a segmented threshing drum, and the rotation speed and direction of the two threshing drums can be controlled separately. When the drum is blocked, the blockage can be resolved by controlling the rotation speed and direction of the two threshing drums separately.

[0022] (2) The controller in the threshing device of the present invention receives pressure values ​​collected by several thin-film pressure sensors, calculates the average pressure value based on several pressure values, and compares the average pressure value with the pressure threshold. When the average pressure value exceeds the pressure threshold, the controller can control the hydraulic cylinder electrically connected to it to move up and down, thereby adjusting the gap between the two threshing drum assemblies, greatly reducing the possibility of crop clogging the drum, and enabling the threshing of straw under various conditions.

[0023] (3) The front end threshing element of the first threshing drum in this invention is a spirally distributed plate tooth, which can not only realize the backward conveying of straw, but also improve the threshing effect of crop seeds, and greatly improve the threshing efficiency of the threshing device. Attached Figure Description

[0024] Figure 1 This is one of the schematic diagrams of the threshing device in this invention.

[0025] Figure 2 This is a second schematic diagram of the threshing device in this invention (without baffles, guide plates, and concave sieves).

[0026] Figure 3 for Figure 2 The front view.

[0027] Figure 4 This is a schematic diagram of the upper threshing drum assembly in this invention.

[0028] Figure 5 This is a cross-sectional view of the upper threshing drum assembly in this invention.

[0029] Figure 6 This is the third schematic diagram of the threshing device in this invention (without baffles, guide plates, and concave sieves).

[0030] Figure 7 This is a schematic diagram of a separable transmission structure.

[0031] Figure 8 This is a schematic diagram of the guide plate in this invention.

[0032] Figure 9 This is a schematic diagram of the concave plate sieve in this invention.

[0033] Illustration markings: 1. Side plate, 2. Guide plate, 201. Blade, 3. Baffle, 301. Feed port, 4. Concave screen, 5. Upper threshing drum assembly, 501. First threshing drum, 5011. First plate tooth, 502. Second threshing drum, 5021. First rod tooth, 6. Pulley, 7. U-shaped limit plate, 8. Hydraulic cylinder, 9. Lower threshing drum assembly, 901. Spiral blade, 902. Second plate tooth, 903. Second rod tooth, 10. Bearing with seat, 11. Thin-film pressure sensor, 12. Spring, 13. Mounting shaft, 14. Inner cylinder, 15. Arc plate, 16. Outer cylinder, 17. First ratchet tooth, 18. Second ratchet tooth. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0035] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0036] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] This invention provides a double-drum threshing device for harvesting white radish seeds. Please refer to [link / reference]. Figure 1 and Figure 2The device includes a housing, two threshing roller assemblies housed within the housing, a drive mechanism for rotating the two threshing roller assemblies, and a lifting mechanism for adjusting the distance between the two threshing roller assemblies. Through the cooperation of these mechanisms, the radish stalks can be threshed. The specific structure of each mechanism is described in detail below.

[0038] <Box>

[0039] Please refer to Figure 1 The box body is an enclosed structure, including two side plates 1 arranged opposite each other on the left and right, two baffles 3 arranged opposite each other on the front and back, a guide plate 2 located above, and a concave sieve 4 located below. The two side plates 1, the two baffles 3, the guide plate 2, and the concave sieve 4 together form the box body. The baffles 3 are provided with material inlets 301 for straw to enter or exit, and the box body is provided with a threshing chamber.

[0040] Specifically, both opposite side plates 1 are provided with waist-shaped holes on the upper part and through holes on the lower part. The first threshing roller 501 and the second threshing roller 502 can extend to the outside of the box through the waist-shaped holes, and the lower threshing roller assembly 9 can extend to the outside of the box through the through holes.

[0041] It should be noted that a U-shaped limiting plate 7 is provided on the opposite end face of the two opposite side plates 1. The free ends of the two parallel side walls of the U-shaped limiting plate 7 are fixedly connected to the outer surface of the side plate 1. A through groove is provided on the bottom wall of the U-shaped limiting plate 7.

[0042] Please refer to Figure 8 The guide plate 2 has an outwardly convex arc-shaped structure, and its inner side is provided with blades 201. The blades 201 are at a certain tilt angle, which not only assists in threshing but also realizes the function of transporting crops backward.

[0043] Please refer to Figure 9 The concave plate screen 4 has an inwardly concave arc-shaped structure and uses a grid screen.

[0044] <Two threshing drum assemblies>

[0045] Please refer to Figures 3 to 7 Two threshing roller assemblies are distributed vertically between two opposite side plates 1 and can rotate independently. The two threshing roller assemblies work together to squeeze the radish stalks and thresh them.

[0046] The upper threshing drum assembly 5 located at the top includes mounting shafts 13 extending from corresponding side plates 1 at both ends, and a first threshing drum 501 and a second threshing drum 502 that are mounted on the mounting shafts 13 and distributed left and right. The lower threshing drum assembly 9 located at the bottom has an integral structure, including an inner cylinder 14, an outer cylinder 16 coaxially fitted outside the inner cylinder 14, and two arc-shaped plates 15 arranged left and right opposite each other to seal the space between the inner and outer cylinders 16.

[0047] Specifically, the outer cylinder 16 of the first threshing drum 501 has several spirally distributed first toothed plates 5011 on its circumferential surface, and the outer cylinder 16 of the second threshing drum 502 has several first rod teeth 5021 on its circumferential surface. The outer cylinder 16 of the lower threshing drum assembly 9 has spiral blades 901, second toothed plates 902, and several second rod teeth 903 on its circumferential surface. The spiral blades 901 and second toothed plates 902 are located on the left section, while the second rod teeth 903 are located on the right section. The spirally distributed first toothed plates 5011 and second toothed plates 902 not only perform the initial threshing of the straw but also convey the crop backward. The spiral blades 901 on the lower threshing drum assembly 9 not only assist in feeding and conveying the straw backward but also perform the first threshing of the crop, removing most of the easily detached white radish seeds from the pods. The threshing is then carried out by the plate teeth and rod teeth at the rear of the upper and lower threshing drum assemblies. The plate teeth can remove the difficult-to-remove white radish seeds from the pods through rubbing, and the crop can be threshed a second time. Then the rod teeth perform a third threshing, at which time a small number of remaining seeds inside the crop can be removed. As the lower threshing drum assembly 9 drives the second rod teeth 903 to rotate, it also plays a role in conveying the crop backward and throwing out the crop straw.

[0048] Springs 12 are also installed on the inner cylinders 14 of the first threshing drum 501 and the second threshing drum 502. The two ends of the springs 12 abut against the arc-shaped plate 15 and the adjacent side plate 1, respectively. The springs 12 enable the segmented threshing drums to move a certain distance in the opposite direction.

[0049] It should be noted that a separable transmission structure is provided between the first threshing drum 501 and the second threshing drum 502. This separable transmission structure is located between the opposing arc-shaped plates 15 within the first and second threshing drums 501 and 502, and includes a first ratchet tooth 17 and a second ratchet tooth 18. The first ratchet tooth 17 is circumferentially distributed on the right end face of the inner cylinder 14 in the first threshing drum 501, and the second ratchet tooth 18 is circumferentially distributed on the left end face of the inner cylinder 14 in the second threshing drum 502. When the separable transmission structure rotates in the forward direction, it enables the first threshing drum 501 and the second threshing drum 502 to mesh; when it rotates in the reverse direction, it enables the first threshing drum 501 and the second threshing drum 502 to separate. Due to the action of the springs 12 at both ends, the first threshing drum 501 and the second threshing drum 502 can operate independently.

[0050] Specifically, the inner cylinders 14 of the first threshing drum 501 and the second threshing drum 502 extend to the outside of the box body through the waist-shaped hole, and the inner cylinder 14 of the lower threshing drum assembly 9 extends to the outside of the box body through the through hole. For ease of description, the part of the inner cylinder 14 that extends to the outside of the box body is referred to as the exposed part.

[0051] <Lifting Mechanism>

[0052] Please refer to Figures 2 to 6 The lifting mechanism includes a seated bearing 10, a hydraulic cylinder 8, a controller, and several thin-film pressure sensors 11. The seated bearing 10 is mounted on the exposed part of the inner cylinder 14. The hydraulic cylinder 8 is mounted on the side plate 1, and its piston rod is connected to the seated bearing 10. The thin-film pressure sensors 11 are located on the outer circumferential surface of the first threshing drum 501 and the left section of the outer circumferential surface of the lower threshing drum assembly 9. The controller receives the pressure values ​​collected by the several thin-film pressure sensors 11, calculates the average pressure value based on the several pressure values, and analyzes whether the average pressure value falls within the set pressure range. When the average pressure value exceeds the set pressure range, the controller can control the hydraulic cylinder 8, which is electrically connected to it, to operate. The hydraulic cylinder 8 can control the lifting and lowering of the upper threshing drum assembly 5, thereby adjusting the distance between the two threshing drum assemblies.

[0053] Specifically, several thin-film pressure sensors 11 are fixed to the front section of the upper and lower threshing drum assemblies 9 of the first threshing drum 501 by pressure plates, and are evenly distributed.

[0054] The thin-film pressure sensor 11 works in conjunction with the controller to select the range of extrusion pressure on radish seeds under different conditions, thereby enabling threshing of radish seeds under various conditions.

[0055] The seated bearing 10 is disposed in the U-shaped hole of the U-shaped limiting plate 7. The inner wall of the U-shaped limiting plate 7 is in clearance fit with the outer circumference of the seated bearing 10, thereby limiting the front and rear displacement of the inner cylinder 14.

[0056] <Drive mechanism>

[0057] The drive mechanism includes a first drive assembly for controlling the rotation of the first threshing drum 501, a second drive assembly for controlling the rotation of the second threshing drum 502, and a third drive assembly for controlling the rotation of the lower threshing drum assembly 9; the three drive assemblies enable the first threshing drum 501, the second threshing drum 502, and the lower threshing drum assembly 9 to rotate independently.

[0058] Each of the three drive components includes a motor (not shown in the figure) and a belt drive unit. The motor is mounted on one side of the housing. The belt drive unit includes two pulleys and a belt. A pulley 6 is installed on the exposed part of the inner cylinder 14 of the first threshing drum 501, the second threshing drum 502, and the lower threshing drum assembly 9. Each belt drive unit is individually controlled by three motors, and its speed and direction can also be adjusted independently. By achieving differential rotation, it is easier to separate the radish seeds from the pods, improving the threshing effect. By achieving forward and reverse rotation, it is possible to prevent crop straw in the threshing chamber from being ejected from the feeding inlet when the drum is blocked, greatly improving the efficiency of the operation.

[0059] It should be noted that the pulley 6 installed on the inner cylinder 14 is located on the outside of the U-shaped limiting plate 7 to avoid interference with the lifting mechanism when the drive assembly is running.

[0060] When the threshing effect is unsatisfactory or the crop feed is too large, the rotational speed of the first threshing drum 501 can be increased by controlling the first drive component, thereby increasing the speed difference between the first threshing drum 501 and the lower threshing drum assembly 9, thus achieving a better threshing effect. When the amount of crop fed is too large, causing blockage of the threshing device, the first drive component can also be controlled to reverse the first threshing drum 501 independently, causing the crop to be ejected from the feed inlet, which can effectively solve the blockage problem in the threshing chamber. The operation is simple and convenient, greatly improving the threshing efficiency.

[0061] Radish stalks are fed into the threshing chamber of the device through the feed inlet 301 of the front baffle 3. Threshing is then achieved through the cooperation of the two threshing drum assemblies. The stalks are then expelled from the feed inlet 301 of the rear baffle 3, completing the threshing process. When the two threshing drum assemblies are working, the first drive assembly first drives the first threshing drum 501 to rotate, and the third drive assembly drives the lower threshing drum assembly 9 to rotate. The rotation of the first threshing drum 501 drives the second threshing drum 502 to rotate, achieving opposite rotations of the two threshing drum assemblies. When the radish plant is fed into the threshing chamber through the baffle 3, the membrane pressure sensor 11 experiences the pressure exerted by the crop on the rollers. The controller receives the pressure value collected by the membrane pressure sensor 11 and calculates the average pressure. When the average pressure exceeds the maximum value of the set pressure range, the controller controls the hydraulic cylinder 8 to move, ultimately lifting the first threshing roller 501 and the second threshing roller 502, increasing the threshing gap between the two threshing roller assemblies, until the pressure value collected by the membrane pressure sensor 11 is within the set pressure range, at which point the hydraulic cylinder 8 stops lifting. Conversely, when the average pressure is lower than the minimum value of the set pressure range, the controller controls the hydraulic cylinder 8 to move, ultimately lowering the first threshing roller 501 and the second threshing roller 502, reducing the threshing gap between the two threshing roller assemblies, until the pressure value collected by the membrane pressure sensor 11 is within the set pressure range, at which point the hydraulic cylinder 8 stops contracting.

[0062] The threshing device features two threshing drum assemblies arranged vertically. These assemblies work in tandem, facilitating smooth feeding of radish stalks and effectively reducing the workload of individual drum assemblies, thus minimizing threshing losses. Furthermore, the gap between the two drum assemblies is adaptively adjustable, allowing for real-time adjustments based on the feed rate and crop moisture level. The first threshing drum 501 can also operate independently. This device effectively avoids problems such as drum clogging, incomplete threshing, and seed damage, thereby improving operational efficiency and adapting to the harvesting needs of radish seeds under various conditions.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention in any way. All equivalent transformations or modifications made in accordance with the essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A double-drum threshing device for harvesting white radish seeds, characterized in that, include: The housing provides installation and threshing space, and the housing includes two side panels arranged opposite to each other on the left and right sides; Two threshing roller assemblies are positioned vertically between two opposing side plates and can rotate independently. The two threshing roller assemblies work together to compress the radish stalks and thresh the radish. The upper threshing roller assembly includes mounting shafts extending from the corresponding side plates at both ends, and a first and second threshing roller positioned horizontally on the mounting shafts. Both the first and second threshing rollers include an inner cylinder, an outer cylinder coaxially fitted around the inner cylinder, and two opposing arc-shaped plates for sealing the space between the inner and outer cylinders. One end of the cylinder near the side plate extends to the outside of the side plate; a separable transmission structure is provided between the arc-shaped plates opposite to the first threshing drum and the second threshing drum. When the separable transmission structure rotates in the forward direction, it can make the first threshing drum and the second threshing drum mesh together, and when it rotates in the reverse direction, it can make the first threshing drum and the second threshing drum separate; the separable transmission structure includes a first ratchet tooth and a second ratchet tooth, wherein the first ratchet tooth is distributed circumferentially on the right end face of the inner cylinder of the first threshing drum, and the second ratchet tooth is distributed circumferentially on the left end face of the inner cylinder of the second threshing drum; The drive mechanism includes a first drive assembly for controlling the rotation of the first threshing drum, a second drive assembly for controlling the rotation of the second threshing drum, and a third drive assembly for controlling the rotation of the lower threshing drum assembly; the three drive assemblies enable the first threshing drum, the second threshing drum, and the lower threshing drum assembly to rotate independently. The lifting mechanism is used to adjust the distance between the two threshing drum assemblies in real time according to the amount of crop fed during the threshing process.

2. The double-drum threshing device for harvesting white radish seeds according to claim 1, characterized in that, Springs are also installed on the inner cylinders of the first and second threshing drums, with the two ends of the springs abutting against the arc-shaped plate and the adjacent side plate, respectively.

3. The double-drum threshing device for harvesting white radish seeds according to claim 1, characterized in that, The first threshing drum has a plurality of spirally distributed first plate teeth on the circumferential surface of the outer cylinder, and the second threshing drum has a plurality of first rod teeth on the circumferential surface of the outer cylinder. The lower threshing drum assembly has spiral blades, spirally distributed second plate teeth, and a plurality of second rod teeth, wherein the spiral blades and second plate teeth are both located on the left section.

4. The double-drum threshing device for harvesting white radish seeds according to claim 1, characterized in that, Both opposite side plates are provided with waist-shaped holes, and the inner cylinders of the first and second threshing rollers extend through the waist-shaped holes to the outside of the box.

5. The double-drum threshing device for harvesting white radish seeds according to claim 4, characterized in that, The lifting mechanism includes a seated bearing, a hydraulic cylinder, a controller, and several thin-film pressure sensors. The seated bearing is mounted on the portion of the inner cylinder extending to the outside of the housing. The hydraulic cylinder is mounted on the side plate, and its piston rod is connected to the seated bearing. The thin-film pressure sensors are located on the outer circumferential surface of the first threshing drum and the outer circumferential surface of the left section of the lower threshing drum assembly. The controller receives pressure values ​​collected by the several thin-film pressure sensors, calculates the average pressure value based on the pressure values, and analyzes whether the average pressure value falls within a set pressure range. When the average pressure value exceeds the set pressure range, the controller can control the hydraulic cylinder electrically connected to it to operate. The hydraulic cylinder can control the lifting and lowering of the upper threshing drum assembly, thereby adjusting the distance between the two threshing drum assemblies.

6. The double-drum threshing device for harvesting white radish seeds according to claim 5, characterized in that, A U-shaped limiting plate is provided on the outer surface of the side plate. The free ends of the two parallel side walls of the U-shaped limiting plate are fixedly connected to the outer surface of the side plate. The inner wall of the U-shaped limiting plate is clearance-fitted with the outer circumference of the bearing with seat, thereby limiting the front and rear displacement of the inner cylinder. A through groove is provided on the bottom wall of the U-shaped limiting plate for the inner cylinder to pass through.

7. The double-drum threshing device for harvesting white radish seeds according to claim 6, characterized in that, The lower threshing drum assembly includes an inner cylinder, an outer cylinder coaxially fitted outside the inner cylinder, and two arc-shaped plates arranged opposite each other to seal the space between the inner and outer cylinders. The first drive assembly, the second drive assembly, and the third drive assembly each include a motor located on the front or rear side of the housing, and a belt drive unit connected to the motor and the inner cylinder. One of the pulleys in the belt drive unit is mounted on the inner cylinder and located on the side of the U-shaped limiting plate away from the belt bearing.

8. The double-drum threshing device for harvesting white radish seeds according to claim 1, characterized in that, In addition to two side plates distributed on the left and right, the box also includes two baffles distributed in the front and back, a guide plate located above and a concave screen located below. The baffles are provided with material inlets for straw to enter or exit; the guide plate has an outwardly convex arc-shaped structure and blades on its inner side to realize the rightward conveying of straw; the concave screen has an inwardly concave arc-shaped structure and adopts a grid screen.

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