Double-roller threshing device for harvesting white radish seeds

Abstract

The invention provides a double-roller threshing device for harvesting white radish seeds, the threshing device comprises two side plates which are oppositely arranged left and right, and two threshing roller assemblies which are vertically distributed between the two opposite side plates, the upper threshing roller assembly comprises a first threshing roller and a second threshing roller, and the lower threshing roller assembly comprises a second threshing roller and a third threshing roller. A separable transmission structure is arranged between the first threshing cylinder and the second threshing cylinder, and the first threshing cylinder and the second threshing cylinder can be meshed or separated when the separable transmission structure rotates in the forward direction or the reverse direction; the first threshing cylinder, the second threshing cylinder and the lower threshing cylinder assembly can independently rotate through the three driving assemblies; the distance between the two threshing cylinder assemblies can be adjusted through the lifting mechanism. The upper threshing cylinder assembly is a sectional type threshing cylinder, the rotating speed and the rotating direction of the two threshing cylinders can be independently controlled, and when the cylinders are blocked, the blocking condition can be solved by independently controlling the rotating speed and the rotating direction of the two sections of threshing cylinders.

Description

Technical Field

[0001] The invention relates to the technical field of roller threshing, in particular to a double-roller threshing device for harvesting white radish seeds. Background Art

[0002] White radish is a biennial plant of the cruciferous family. During the seed harvest period, the pods are silique-shaped, the seeds are nearly conical, and have a high hardness. At present, most areas in my country still use the traditional manual threshing method to process white radish seeds, which is labor-intensive, time-consuming, and easily leads to a high rate of seed and grain breakage during the threshing process. The maturation of white radish seeds has the characteristic of asynchronous maturity, which is specifically manifested in that the upper part of the plant pod matures first, and the lower part matures later. After manual harvesting and drying, centralized threshing operations can be carried out. Therefore, it is necessary to use threshing equipment for threshing work.

[0003] The current threshing device mainly includes a threshing drum, a concave screen and a top cover. When the threshing device is used for threshing, the white radish stalks are fed into the threshing device, and the threshing is achieved by squeezing, rubbing, combing and colliding with the concave screen under the high-speed impact of the threshing drum, and at the same time, axial movement is performed under the action of the concave screen and the top cover. The threshed seeds are separated from the concave screen holes and enter the subsequent cleaning, and a large number of intact stems are discharged from the machine. During harvesting, the load of the threshing drum will change with the different feeding amounts, which will not only reduce the threshing and separation performance, but even cause blockage and shutdown in severe cases.

[0004] Based on this, it is necessary to propose a threshing device that can not only solve the blockage and shorten the threshing time, but also reduce the damage to the grains. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a double-drum threshing device for harvesting white radish seeds. The upper threshing drum assembly in the present invention is a segmented threshing drum, and the rotational speed and direction of the two threshing drums can be independently controlled. When the drum is blocked, the blockage can be solved by independently controlling the rotational speed and direction of the two threshing drums.

[0006] In order to achieve the above object, the specific scheme adopted by the present invention is: A double-drum threshing device for harvesting white radish seeds, comprising: The box body provides installation space and threshing space, and the box body includes two side panels arranged opposite to each other; Two threshing drum assemblies are distributed up and down between two opposite side plates and can rotate independently. The two threshing drum assemblies cooperate to squeeze the white radish stalks and then thresh. Among them, the upper threshing drum assembly located at the top includes a mounting shaft with two ends respectively passing through the corresponding side plates, and a first threshing drum and a second threshing drum that are passed through the mounting shaft and are distributed left and right. A separable transmission structure is provided between the first threshing drum and the second threshing drum. When the separable transmission structure rotates in the forward direction, the first threshing drum and the second threshing drum can be meshed, and when it rotates in the reverse direction, the first threshing drum and the second threshing drum can be separated. The driving mechanism comprises a first driving assembly for controlling the rotation of the first threshing drum, a second driving assembly for controlling the rotation of the second threshing drum, and a third driving assembly for controlling the rotation of the lower threshing drum assembly; the first threshing drum, the second threshing drum and the lower threshing drum assembly can be independently rotated by the three driving assemblies; The lifting mechanism is used to adjust the distance between the two threshing drum assemblies.

[0007] Furthermore, the first threshing drum and the second threshing drum each include an inner cylinder, an outer cylinder coaxially mounted on the outside of the inner cylinder, and two arc-shaped plates relatively arranged on the left and right for sealing the space between the inner and outer cylinders, wherein one end of the inner cylinder close to the side plate extends to the outside of the side plate; a detachable transmission structure is arranged between the relatively arranged arc-shaped plates in the first threshing drum and the second threshing drum, including a first ratchet tooth and a second ratchet tooth, wherein the first ratchet teeth are circumferentially distributed on the right end surface of the inner cylinder in the first threshing drum, and the second ratchet teeth are circumferentially distributed on the left end surface of the inner cylinder in the second threshing drum.

[0008] Furthermore, a spring is also provided on the inner cylinders of the first threshing drum and the second threshing drum, and two ends of the spring are respectively abutted between the arc-shaped plate and the side plate adjacent thereto.

[0009] Furthermore, a plurality of first plate teeth distributed in a spiral manner are provided on the circumferential surface of the inner and outer cylinders of the first threshing drum, a plurality of first rod teeth are provided on the circumferential surface of the inner and outer cylinders of the second threshing drum, and a spiral blade, a spirally distributed second plate teeth, and a plurality of second rod teeth are provided on the lower threshing drum assembly, wherein the spiral blade and the second plate teeth are both provided on the left section.

[0010] Furthermore, waist-shaped holes are provided on the two opposite side plates, and the inner cylinders of the first threshing drum and the second threshing drum extend to the outside of the box body through the waist-shaped holes.

[0011] Furthermore, the lifting mechanism includes a seat bearing, a hydraulic cylinder, a controller and several film pressure sensors, the seat bearing is installed on the part of the inner cylinder extending to the outside of the box body, the hydraulic cylinder is installed on the side plate and its piston rod is connected to the seat bearing, the film pressure sensor is arranged 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 the pressure values ​​collected by several film pressure sensors, calculates the pressure average according to the several pressure values, and analyzes whether the pressure average falls into the set pressure range, when the pressure average exceeds the set pressure range, the controller can control the hydraulic cylinder electrically connected to it to move, and the lifting and lowering of the upper threshing drum assembly can be controlled by the hydraulic cylinder, thereby adjusting the distance between the two threshing drum assemblies.

[0012] Furthermore, a U-shaped limit plate is provided on the outer surface of the side plate, the free ends of the two parallel side walls of the U-shaped limit plate are fixedly connected to the outer surface of the side plate, the inner wall of the U-shaped limit plate is matched with the outer peripheral clearance of the seat bearing, thereby limiting the forward and backward deviation of the inner cylinder, and a through groove for the inner cylinder to pass through is provided on the bottom wall of the U-shaped limit plate.

[0013] Furthermore, the lower threshing drum assembly includes an inner cylinder, an outer cylinder coaxially mounted on the outside of the inner cylinder, and two arc-shaped plates arranged opposite to each other on the left and right for sealing the space between the inner and outer cylinders. The first drive assembly, the second drive assembly and the third drive assembly all include a motor arranged on the front or rear side of the casing, and a belt transmission unit connected to the motor and the inner cylinder. One of the pulleys in the belt transmission unit is installed on the inner cylinder and is located on the side of the U-shaped limit plate away from the seat bearing.

[0014] Furthermore, in addition to two side panels distributed on the left and right, the box body also includes two baffles distributed front and back, a guide plate located at the top and a concave screen located at the bottom. The baffle is provided with a material port for straw to enter or be spit out; the guide plate is an outwardly convex arc structure, and blades are provided on its inner side to realize the straw transportation to the right; the concave screen is an inwardly concave arc structure and adopts a grid screen.

[0015] Beneficial effects: (1) The upper threshing drum in the present invention is a segmented threshing drum, and the rotation speed and direction of the two threshing drums can be controlled independently. When the drum is blocked, the blockage can be solved by independently controlling the rotation speed and direction of the two segments of the threshing drum.

[0016] (2) The controller in the threshing device of the present invention receives pressure values ​​collected by a plurality of thin film pressure sensors, calculates a pressure average based on the plurality of pressure values, and compares the pressure average with a pressure threshold. When the pressure average exceeds the pressure threshold, the controller can control the hydraulic cylinder electrically connected thereto to move up and down, thereby adjusting the gap between the two threshing drum assemblies, greatly reducing the possibility of crops blocking the drums, and realizing straw threshing work under various conditions.

[0017] (3) The front end threshing element of the first threshing drum in the present invention is a spirally distributed plate tooth, which can not only realize the backward conveyance of straw, but also improve the threshing effect of crop seeds, thereby greatly improving the threshing efficiency of the threshing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is one of the schematic diagrams of the threshing device in the present invention.

[0019] Figure 2 This is the second schematic diagram of the threshing device in the present invention (without baffles, guide plates and concave screens).

[0020] Figure 3 for Figure 2 Front view of .

[0021] Figure 4 It is a schematic diagram of the upper threshing drum assembly in the present invention.

[0022] Figure 5 It is a cross-sectional view of the upper threshing drum assembly of the present invention.

[0023] Figure 6 This is the third schematic diagram of the threshing device in the present invention (without baffles, guide plates and concave screens).

[0024] Figure 7 A schematic diagram of a detachable transmission structure.

[0025] Figure 8 Schematic diagram of the guide plate in the present invention.

[0026] Fig. 9 It is a schematic diagram of the concave plate screen in the present invention.

[0027] Graphic markings: 1. Side plate, 2. Guide plate, 201. Blade, 3. Baffle, 301. Material port, 4. Concave plate 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. Seat bearing, 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 DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0031] The present invention provides a double-drum threshing device for harvesting white radish seeds. Figure 1 and Figure 2The device includes a box body, two threshing drum assemblies arranged in the box body, a driving mechanism for driving the two threshing drum assemblies to rotate, and a lifting mechanism for adjusting the distance between the two threshing drum assemblies. The various mechanisms cooperate with each other to thresh the white radish stalks. The specific structure of each mechanism is described in detail below.

[0032] <Box> Please refer to Figure 1 The box body is a closed structure as a whole, including two side plates 1 arranged opposite to each other, two baffles 3 arranged opposite to each other, a guide plate 2 located at the top and a concave screen 4 located at the bottom. The two side plates 1, the two baffles 3, the guide plate 2 and the concave screen 4 together form a box body. The baffle 3 is provided with a material port 301 for straw to enter or spit out, and a threshing chamber is provided in the box body.

[0033] Specifically, the upper parts of the two opposite side plates 1 are both provided with waist-shaped holes, and the lower parts are both provided with through holes. The first threshing drum 501 and the second threshing drum 502 can extend to the outside of the box through the waist-shaped holes, and the lower threshing drum assembly 9 can extend to the outside of the box through the through holes.

[0034] It should be noted that U-shaped limit plates 7 are provided on the end surfaces facing away from each other of the two opposite side plates 1 , the free ends of the two parallel side walls of the U-shaped limit plate 7 are fixedly connected to the outer surface of the side plate 1 , and a through groove is provided on the bottom wall of the U-shaped limit plate 7 .

[0035] Please refer to Figure 8 The guide plate 2 is an outwardly convex arc structure, and a blade 201 is arranged on its inner side. The blade 201 is inclined at a certain angle, which assists threshing and also realizes the function of transporting crops backwards.

[0036] Please refer to Fig. 9 The concave plate screen 4 is an inwardly concave arc structure and adopts a grid screen.

[0037] <Two threshing drum assemblies> Please refer to Figures 3 to 7 The two threshing drum assemblies are distributed up and down between the two opposite side plates 1 and can rotate independently. The two threshing drum assemblies cooperate to squeeze the white radish stalks and then thresh.

[0038] The upper threshing drum assembly 5 located at the top includes a mounting shaft 13 with two ends passing through the corresponding side plates 1, and a first threshing drum 501 and a second threshing drum 502 passing through the mounting shaft 13 and distributed on the left and right. The lower threshing drum assembly 9 located at the bottom is an integrated structure as a whole, including an inner cylinder 14, an outer cylinder 16 coaxially sleeved on the outside of the inner cylinder 14, and two arc plates 15 arranged opposite to each other on the left and right for sealing the space between the inner and outer cylinders 16.

[0039] Specifically, a plurality of first plate teeth 5011 distributed in a spiral manner are provided on the circumferential surface of the inner and outer cylinders 16 of the first threshing drum 501, and a plurality of first rod teeth 5021 are provided on the circumferential surface of the inner and outer cylinders 16 of the second threshing drum 502. A spiral blade 901, a second plate tooth 902, and a plurality of second rod teeth 903 are provided on the circumferential surface of the inner and outer cylinders 16 of the lower threshing drum assembly 9, wherein the spiral blade 901 and the second plate tooth 902 are both provided on the left section, and the second rod tooth 903 is provided on the right section. The first plate teeth 5011 and the second plate teeth 902 are distributed in a spiral manner, which not only play a role in preliminary threshing of the straw, but also play a role in conveying the crop backward. The spiral blade 901 on the lower threshing drum assembly 9 not only assists in feeding the straw and conveying the straw backward, but also realizes the first threshing of the crop, and can remove most of the white radish seeds that are easy to be removed from the fruit pods. Then the plate teeth and rod teeth at the rear part of the upper and lower threshing drum assemblies are used for threshing. The plate teeth can remove the white radish seeds that are difficult to remove from the fruit pods by rubbing, and the crops can be threshed for the second time. Then the rod teeth are threshed for the third time, and the small amount of grains remaining inside the crops can be removed. As the lower threshing drum assembly 9 drives the second rod teeth 903 to rotate, it also plays a role in transporting the crops backwards and throwing out the crop straw.

[0040] The inner cylinder 14 of the first threshing drum 501 and the second threshing drum 502 is also provided with a spring 12, and the two ends of the spring 12 are respectively abutted between the arc plate 15 and the adjacent side plate 1. The spring 12 can realize a certain moving distance for the reverse rotation of the segmented threshing drum.

[0041] It should be noted that a detachable transmission structure is provided between the first threshing drum 501 and the second threshing drum 502. The detachable transmission structure is provided between the arc-shaped plates 15 arranged opposite to each other in the first threshing drum 501 and the second threshing drum 502, and includes a first ratchet tooth 17 and a second ratchet tooth 18, wherein the first ratchet tooth 17 is circumferentially distributed on the right end surface of the inner cylinder 14 in the first threshing drum 501, and the second ratchet tooth 18 is circumferentially distributed on the left end surface of the inner cylinder 14 in the second threshing drum 502. The detachable transmission structure can mesh the first threshing drum 501 and the second threshing drum 502 when rotating in the forward direction, and can separate the first threshing drum 501 and the second threshing drum 502 when rotating in the reverse direction, and due to the action of the springs 12 at both ends, the first threshing drum 501 and the second threshing drum 502 can work independently.

[0042] Specifically, the inner cylinder 14 of the first threshing drum 501 and the second threshing drum 502 extends to the outside of the box through the waist-shaped hole, and the inner cylinder 14 in the lower threshing drum assembly 9 extends to the outside of the box through the through hole. For the convenience of description below, the part of the inner cylinder 14 extending to the outside of the box is referred to as the exposed part.

[0043] <Lifting mechanism> Please refer to Figures 2 to 6 The lifting mechanism includes a seat bearing 10, a hydraulic cylinder 8, a controller and a plurality of film pressure sensors 11. The seat bearing 10 is installed on the exposed part of the inner cylinder 14. The hydraulic cylinder 8 is installed on the side plate 1 and its piston rod is connected to the seat bearing 10. The film pressure sensor 11 is arranged on the outer circumference of the first threshing drum 501 and the outer circumference of the left section of the lower threshing drum assembly 9. The controller receives the pressure values ​​collected by the plurality of film pressure sensors 11, calculates the pressure average according to the plurality of pressure values, calculates the pressure average according to the plurality of pressure values, and analyzes whether the pressure average falls into the set pressure interval. When the pressure average exceeds the set pressure interval, the controller can control the hydraulic cylinder 8 electrically connected thereto to act, and 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.

[0044] Specifically, a plurality of thin film pressure sensors 11 are fixed to the first threshing drum 501 and the front section of the lower threshing drum assembly 9 respectively through pressing plates and are evenly distributed.

[0045] The film pressure sensor 11 cooperates with the controller to select the squeezing force range of the white radish seeds under different states, thereby realizing the threshing of the white radish seeds under various states.

[0046] The seat bearing 10 is arranged in the U-shaped hole of the U-shaped limiting plate 7 , and the inner wall of the U-shaped limiting plate 7 is in clearance with the outer periphery of the seat bearing 10 , thereby limiting the front-rear deviation of the inner cylinder 14 .

[0047] <Drive mechanism> The driving mechanism includes a first driving component for controlling the rotation of the first threshing drum 501, a second driving component for controlling the rotation of the second threshing drum 502, and a third driving component for controlling the rotation of the lower threshing drum assembly 9; the first threshing drum 501, the second threshing drum 502 and the lower threshing drum assembly 9 can be rotated independently through the three driving components.

[0048] The three driving components all include a motor (not shown in the figure) and a belt transmission unit, the motor is installed on one side of the motor, the belt transmission unit includes two pulleys and a belt, and a pulley 6 is installed on the exposed part of the inner cylinder 14 in the first threshing drum 501, the second threshing drum 502 and the lower threshing drum assembly 9. Each belt transmission unit is controlled separately by three motors, and its rotation speed and direction can also be adjusted separately. By realizing differential rotation, it is easier to remove the white radish seeds from the fruit pods, and the threshing effect is improved. By realizing forward and reverse rotation, it can prevent the crop straw in the threshing chamber from being spit out from the feeding port when the drum is blocked, which greatly improves the efficiency of the operation.

[0049] It should be noted that the pulley 6 mounted on the inner cylinder 14 is arranged on the outer side of the U-shaped limiting plate 7 to avoid interference with the lifting mechanism when the driving assembly is running.

[0050] When the threshing effect is not ideal or the crop feeding amount is large, the speed of the first threshing drum 501 can be increased by controlling the first driving component, so that the speed difference between the first threshing drum 501 and the lower threshing drum assembly 9 is increased, thereby achieving a better threshing effect. When the feeding amount of crops is large and causes the threshing device to be blocked, the first driving component can be controlled to reverse the first threshing drum 501 alone, so that the crops are spit out from the feeding port, which can effectively solve the blockage phenomenon in the threshing chamber. The operation is simple and convenient, and the threshing efficiency is greatly improved.

[0051] The white radish stalks are fed into the threshing chamber of the device from the feed opening 301 of the baffle plate 3 at the front, and then threshing is achieved under the cooperation of the two threshing drum assemblies, and the stalks are spit out from the feed opening 301 of the baffle plate 3 at the rear, completing the threshing work. When the two threshing drum assemblies are working, the first driving assembly first drives the first threshing drum 501 to rotate, the third driving assembly drives the lower threshing drum assembly 9 to rotate, and the first threshing drum 501 rotates to drive the second threshing drum 502 to rotate, so as to achieve the opposite rotation of the two threshing drum assemblies. When the white radish plants are fed into the threshing chamber through the baffle 3, the film pressure sensor 11 will be subjected to the squeezing force of the crops on the roller. The controller receives the pressure value collected by the film pressure sensor 11 and calculates the pressure average. When the pressure average exceeds the maximum value of the set squeezing pressure range, the controller controls the hydraulic cylinder 8 to operate, and finally completes the lifting of 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 film pressure sensor 11 is within the set pressure range, and the hydraulic cylinder 8 stops lifting. On the contrary, when the pressure average is lower than the minimum value of the set squeezing pressure range, the controller controls the hydraulic cylinder 8 to operate, and finally completes the descent of 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 film pressure sensor 11 is within the set pressure range, and the hydraulic cylinder 8 stops contracting.

[0052] The two threshing drum assemblies of the threshing device are distributed up and down. The two threshing drum assemblies work together, which is conducive to the smooth feeding of white radish straw on the one hand, and can effectively reduce the workload of a single threshing drum assembly and reduce threshing losses on the other hand. At the same time, the gap between the two threshing drum assemblies has an adaptive adjustment function, which can be adjusted in real time according to the drum feeding amount and the dryness and wetness of the crop, and the first threshing drum 501 can work alone. The device as a whole can effectively avoid problems such as drum blockage, insufficient threshing, and grain damage, thereby improving work efficiency, and can adapt to the harvesting operation needs of white radish seeds under various conditions.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any equivalent changes or modifications made according to the essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-drum threshing device for harvesting white radish seeds, characterized in that: include: The box body provides installation space and threshing space, and the box body includes two side panels arranged opposite to each other; Two threshing drum assemblies are distributed up and down between two opposite side plates and can rotate independently. The two threshing drum assemblies cooperate to squeeze the white radish stalks and then thresh. Among them, the upper threshing drum assembly located at the top includes a mounting shaft with two ends respectively passing through the corresponding side plates, and a first threshing drum and a second threshing drum that are passed through the mounting shaft and are distributed left and right. A separable transmission structure is provided between the first threshing drum and the second threshing drum. When the separable transmission structure rotates in the forward direction, the first threshing drum and the second threshing drum can be meshed, and when it rotates in the reverse direction, the first threshing drum and the second threshing drum can be separated. The driving mechanism comprises a first driving assembly for controlling the rotation of the first threshing drum, a second driving assembly for controlling the rotation of the second threshing drum, and a third driving assembly for controlling the rotation of the lower threshing drum assembly; the first threshing drum, the second threshing drum and the lower threshing drum assembly can be independently rotated by the three driving assemblies; The lifting mechanism is used to adjust the distance between the two threshing drum assemblies.

2. A double-drum threshing device for harvesting white radish seeds according to claim 1, characterized in that: The first threshing drum and the second threshing drum each include an inner cylinder, an outer cylinder coaxially mounted on the outside of the inner cylinder, and two arc-shaped plates relatively arranged on the left and right for sealing the space between the inner and outer cylinders, wherein one end of the inner cylinder close to the side plate extends to the outside of the side plate; a detachable transmission structure is arranged between the relatively arranged arc-shaped plates in the first threshing drum and the second threshing drum, including first ratchet teeth and second ratchet teeth, wherein the first ratchet teeth are circumferentially distributed on the right end surface of the inner cylinder in the first threshing drum, and the second ratchet teeth are circumferentially distributed on the left end surface of the inner cylinder in the second threshing drum.

3. A double-drum threshing device for harvesting white radish seeds according to claim 2, characterized in that: A spring is also provided on the inner cylinders of the first threshing drum and the second threshing drum, and two ends of the spring are respectively abutted between the arc-shaped plate and the side plate adjacent thereto.

4. A double-drum threshing device for harvesting white radish seeds according to claim 2, characterized in that: A plurality of first plate teeth distributed in a spiral manner are arranged on the circumferential surface of the inner and outer cylinders of the first threshing drum, a plurality of first rod teeth are arranged on the circumferential surface of the inner and outer cylinders of the second threshing drum, and a spiral blade, a spirally distributed second plate teeth, and a plurality of second rod teeth are arranged on the lower threshing drum assembly, wherein the spiral blade and the second plate teeth are both arranged on the left section.

5. The double-drum threshing device for harvesting white radish seeds according to claim 2, characterized in that: Both opposite side plates are provided with waist-shaped holes, and the inner cylinders of the first threshing drum and the second threshing drum extend to the outside of the box body through the waist-shaped holes.

6. A double-drum threshing device for harvesting white radish seeds according to claim 5, characterized in that: The lifting mechanism includes a seat bearing, a hydraulic cylinder, a controller and several film pressure sensors. The seat bearing is installed on the part of the inner cylinder extending to the outside of the box body. The hydraulic cylinder is installed on the side plate and its piston rod is connected to the seat bearing. The film pressure sensor is arranged 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 several film pressure sensors, calculates the pressure average according to the several pressure values, and analyzes whether the pressure average falls into the set pressure range. When the pressure average exceeds the set pressure range, the controller can control the hydraulic cylinder electrically connected to it to move, and the lifting and lowering of the upper threshing drum assembly can be controlled by the hydraulic cylinder, thereby adjusting the distance between the two threshing drum assemblies.

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

8. The double-drum threshing device for harvesting white radish seeds according to claim 7, characterized in that: The lower threshing drum assembly includes an inner cylinder, an outer cylinder coaxially mounted on the outside of the inner cylinder, and two arc-shaped plates arranged opposite to each other on the left and right for sealing the space between the inner and outer cylinders. The first drive assembly, the second drive assembly and the third drive assembly all include a motor arranged on the front or rear side of the box body, and a wheel belt transmission unit connected to the motor and the inner cylinder. One of the pulleys in the wheel belt transmission unit is installed on the inner cylinder and is located on the side of the U-shaped limit plate away from the seat bearing.

9. 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 body also includes two baffles distributed front and back, a guide plate located at the top and a concave screen located at the bottom. The baffle is provided with a material port for straw to enter or be spit out; the guide plate is an outwardly convex arc structure, and blades are provided on its inner side surface to realize the straw transportation to the right; the concave screen is an inwardly concave arc structure and adopts a grid screen.

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