Agricultural material sorting machine

Abstract

The utility model relates to the technical field of agricultural material sorting equipment, in particular to an agricultural material sorting machine which comprises a first-stage screening barrel, a second-stage screening barrel and an outer sleeve. End covers are arranged at the two ends of the outer sleeve, first-stage screening holes are formed in the first-stage screening barrel, second-stage screening holes are formed in the second-stage screening barrel, the hole diameter of the second-stage screening holes is smaller than that of the first-stage screening holes, third-stage screening holes are formed in the bottom of the outer sleeve, the hole diameter of the third-stage screening holes is smaller than that of the second-stage screening holes, and the first-stage screening barrel and the second-stage screening barrel are arranged in the outer sleeve. Supporting legs are further arranged at the bottom of the outer sleeve, the first-stage screening barrel, the second-stage screening barrel and the outer sleeve are coaxially arranged, the axes of the first-stage screening barrel, the second-stage screening barrel and the outer sleeve are parallel to the horizontal direction, the first-stage screening barrel is sleeved with the second-stage screening barrel, the second-stage screening barrel is sleeved with the outer sleeve, and the first-stage screening barrel and the second-stage screening barrel are coaxially arranged. The first-stage screening barrel and the second-stage screening barrel can be connected with the outer sleeve in the mode of rotating around the axes of the first-stage screening barrel and the second-stage screening barrel. The multi-stage screening device has the effects that the occupied area is reduced, energy consumption is reduced, and multi-stage screening is achieved.

Description

Technical Field

[0001] This application relates to the technical field of agricultural material sorting equipment, and in particular to an agricultural material sorting machine. Background Technology

[0002] Agricultural material sorting machines are widely used in agriculture for screening and grading materials such as grains and seeds. With the development of modern agricultural technology, efficient material sorting equipment not only significantly improves production efficiency but also ensures the quality and purity of materials, thereby enhancing the market competitiveness of agricultural products. In agricultural production, material sorting machines have become indispensable equipment, and their performance directly affects the efficiency and quality of agricultural product processing.

[0003] Currently, the commonly used methods for sorting agricultural materials in the industry mainly include single-screen vibrating screening or multi-device series screening. Single-screen vibrating screening uses a vibrating device to move the material on the screen to separate particles of different sizes. However, the single-layer screen structure is prone to material accumulation, and the separation of fine particles is incomplete. Although multi-device series screening can screen materials step by step to achieve grading, multi-stage screening requires multiple devices connected in series, which occupies a large area and consumes a lot of energy. It is also prone to material accumulation. Utility Model Content

[0004] In order to reduce land occupation and energy consumption while achieving multi-stage screening, this application provides an agricultural material sorting machine.

[0005] The agricultural material sorting machine provided in this application adopts the following technical solution:

[0006] An agricultural material sorting machine includes a primary screening cylinder, a secondary screening cylinder, and an outer sleeve. The outer sleeve has end caps at both ends. The primary screening cylinder has primary screening holes, and the secondary screening cylinder has secondary screening holes, the diameter of which is smaller than that of the primary screening holes. The bottom of the outer sleeve has tertiary screening holes, the diameter of which is smaller than that of the secondary screening holes. The bottom of the outer sleeve also has support legs. The primary, secondary, and outer sleeves are all coaxially arranged with their axes parallel to the horizontal direction. The secondary screening cylinder is fitted outside the primary screening cylinder, and the outer sleeve is fitted outside the secondary screening cylinder. Both the primary and secondary screening cylinders are rotatably connected to the outer sleeve around their own axes.

[0007] By adopting the above technical solution, the agricultural material sorting machine can achieve multi-stage screening of agricultural materials of different sizes. The primary and secondary screening cylinders, with different screen aperture designs, screen larger and smaller materials respectively, while the tertiary screen aperture at the bottom of the outer cylinder further screens the smallest materials. This multi-stage screening structure significantly improves screening efficiency and accuracy, while the coaxial arrangement and horizontal axis design ensure the flowability of materials during the screening process, effectively avoiding clogging.

[0008] Optionally, it also includes a primary transmission mechanism, which includes an input shaft, a primary external gear ring, a primary sun gear, multiple primary planetary gears, and a primary planetary carrier. The primary sun gear is coaxially and fixedly connected to the primary screening cylinder. The input shaft is fixedly connected to the primary sun gear via a connecting rod. The primary external gear ring is coaxially and fixedly connected to the secondary screening cylinder. The primary planetary carrier has carrier legs and carrier rings. The primary planetary carrier is fixedly connected to the end cover via carrier legs. The primary planetary gears are rotatably connected to the carrier legs of the primary planetary carrier via bearings, and the primary planetary gears mesh with the primary external gear ring and the primary sun gear, respectively.

[0009] By adopting the above technical solution, the input shaft receives external power input and is fixedly connected to the primary sun gear via a connecting rod. As the input shaft rotates, the primary sun gear rotates accordingly. The primary sun gear is coaxially and fixedly connected to the primary screening cylinder, so the primary screening cylinder also rotates with the primary sun gear, thereby achieving the screening of materials within the primary screening cylinder. The primary planetary gears mesh with both the primary external gear ring and the primary sun gear. Because the primary planetary carrier is fixedly connected to the end cover, when the primary sun gear rotates, the primary planetary gears only rotate around their own axes. The primary external gear ring is coaxially and fixedly connected to the secondary screening cylinder. Because the primary planetary gears mesh with the primary external gear ring, as the primary planetary gears rotate, the primary external gear ring and the secondary screening cylinder fixed to it also rotate under driving force, thereby achieving the screening of materials within the secondary screening cylinder.

[0010] Optionally, a secondary transmission mechanism is also included. The secondary transmission mechanism includes a secondary external gear ring, a secondary sun gear, multiple secondary planetary gears, and a secondary planetary carrier. The secondary sun gear is sleeved outside the primary external gear ring and is integrally formed with the primary external gear ring. The secondary external gear ring is coaxially and fixedly connected to the outer sleeve. The secondary planetary carrier has carrier feet and carrier rings. The secondary planetary gears are rotatably connected to the carrier feet of the secondary planetary carrier through bearings around their own axes. The secondary planetary gears mesh with the secondary external gear ring and the secondary sun gear respectively.

[0011] By adopting the above technical solution, power is input from the secondary sun gear, which then begins to rotate. Since the secondary external gear ring is coaxially and fixedly connected to the outer sleeve, it remains stationary. The secondary planetary gears mesh with both the secondary sun gear and the secondary external gear ring. When the secondary sun gear rotates, it drives the secondary planetary gears to rotate on their own axes while simultaneously revolving around the center of the secondary sun gear, maintaining their meshing relationship with the secondary external gear ring. The revolution of the secondary planetary gears is transmitted to the secondary planetary carrier via the carrier legs; therefore, when the secondary planetary gears revolve, they drive the secondary planetary carrier to rotate as well. This secondary transmission mechanism ensures more stable rotation of the secondary screening cylinder, guaranteeing reliable power transmission, and also lays the foundation for the subsequent installation of external brush rods.

[0012] Optionally, there are two primary transmission mechanisms and two secondary transmission mechanisms, which are located at opposite ends of the outer sleeve.

[0013] By adopting the above technical solutions, agricultural material sorting machines can achieve more uniform power transmission. This layout effectively improves the stability of the transmission system, reduces equipment wear caused by uneven force on one side, and thus extends the service life of the equipment. At the same time, the design of setting transmission mechanisms at both ends enhances the smoothness of the screening cylinder's rotation, further improving the effect and efficiency of material screening.

[0014] Optionally, it also includes an outer brush rod and an inner brush rod. The two ends of the outer brush rod are fixedly connected to the ring of the secondary planetary carrier, and the two ends of the inner brush rod are fixedly connected to the ring of the primary planetary carrier. The outer brush rod has bristles on both sides for abutting against the outer wall of the secondary screening cylinder and the inner wall of the outer sleeve, and the inner brush rod has bristles on both sides for abutting against the outer wall of the primary screening cylinder and the inner wall of the secondary screening cylinder.

[0015] By adopting the above technical solution, the outer and inner brush rods effectively remove material residue between the primary screening cylinder, the secondary screening cylinder, and the outer casing. Specifically, the bristles on the outer brush rod abut against the outer wall of the secondary screening cylinder and the inner wall of the outer casing, cleaning the material adhering between them; the bristles on the inner brush rod abut against the outer wall of the primary screening cylinder and the inner wall of the secondary screening cylinder, cleaning material residue on the surface and inside of the primary screening cylinder. This design significantly improves the cleaning efficiency of the equipment, reduces clogging, extends the service life of the equipment, and ensures the continuity and stability of the sorting process.

[0016] Optionally, it also includes a motor, which is located outside the outer sleeve and fixedly connected to the end cover, and the output end of the motor passes through the end cover and is driven by the input shaft.

[0017] By adopting the above technical solution, the motor is mounted outside the outer sleeve and fixedly connected to the end cover, making the overall structure more compact and facilitating motor installation and maintenance. The motor's output end is driven by the input shaft, achieving effective power transmission and ensuring stable rotation of the primary and secondary screening cylinders.

[0018] Optionally, one of the end caps not connected to the motor is provided with a feed inlet that communicates with the inside of the primary screening cylinder.

[0019] By adopting the above technical solution, a feed inlet connected to the inside of the primary screening cylinder is set on the end cover, so that the material can directly enter the primary screening cylinder for screening.

[0020] Optionally, the bottom of the outer sleeve is provided with a first compartment door, and all three levels of sieve holes are located in the first compartment door.

[0021] By adopting the above technical solution, the three-stage screen holes are concentrated in the first chamber door area, which facilitates the third-stage screening and centralized discharge of the remaining material after the second-stage screening. At the same time, the setting of the first chamber door also facilitates the maintenance and cleaning of the equipment. After collecting the material after the third-stage screening, the material that has passed the second-stage screening and remains between the outer casing and the second-stage screening cylinder can be collected by opening the first chamber door.

[0022] Optionally, the secondary screening cylinder is provided with a second compartment door.

[0023] By adopting the above technical solution, the setting of the second chamber door also facilitates the maintenance and cleaning of the equipment. After opening the first chamber door to collect the material after two-stage screening, opening the second chamber door can collect the material that has passed the first screening and remains between the first and second screening cylinders. The remaining material in the first screening cylinder can be removed by removing the end cover.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By setting up a primary screening cylinder, a secondary screening cylinder, and an outer sleeve, and making the three coaxial with successively decreasing apertures, multi-stage screening of materials can be achieved, significantly improving screening accuracy and efficiency, and effectively solving the problems of insufficient screening accuracy, large footprint, and high energy consumption in related technologies.

[0026] 2. Both the primary and secondary screening cylinders can rotate around their own axes. Combined with the design of multi-stage screen holes, the centrifugal force and gravity can be used during rotation to ensure more uniform material grading and meet the needs of multi-stage screening.

[0027] 3. The first and second compartment doors improve the material classification and collection function and enhance the ease of operation of the equipment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the agricultural material sorting machine provided in the embodiments of this application.

[0029] Figure 2 This is a schematic diagram of the structure of the agricultural material sorting machine provided in the embodiments of this application, wherein the end cover is not shown.

[0030] Figure 3 This is a schematic diagram of the internal structure of the agricultural material sorting machine provided in the embodiments of this application.

[0031] Explanation of reference numerals in the attached diagram: 1-First-stage screening cylinder; 101-First-stage sieve hole; 2-Second-stage screening cylinder; 201-Second-stage sieve hole; 202-Second chamber door; 3-Outer sleeve; 301-Third-stage sieve hole; 302-End cover; 303-Feed inlet; 304-First chamber door; 4-Support leg; 5-Input shaft; 6-First-stage external gear ring; 7-First-stage sun gear; 8-First-stage planetary gear; 9-First-stage planetary carrier; 10-Connecting rod; 11-Second-stage external gear ring; 12-Second-stage sun gear; 13-Second-stage planetary gear; 14-Second-stage planetary carrier; 15-Outer brush rod; 16-Inner brush rod; 17-Motor. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0033] This application discloses an agricultural material sorting machine.

[0034] like Figures 1-3 As shown, the agricultural material sorting machine includes a primary screening cylinder 1, a secondary screening cylinder 2, and an outer sleeve 3. The outer sleeve 3 has end caps 302 at both ends. The primary screening cylinder 1 is provided with primary screening holes 101, and the secondary screening cylinder 2 is provided with secondary screening holes 201. The diameter of the secondary screening holes 201 is smaller than that of the primary screening holes 101. The bottom of the outer sleeve 3 is provided with tertiary screening holes 301. The diameter of the tertiary screening holes 301 is smaller than that of the secondary screening holes 201. The bottom of the outer sleeve 3 is also provided with support legs 4. The primary screening cylinder 1, the secondary screening cylinder 2, and the outer sleeve 3 are all coaxially arranged, and the axis is parallel to the horizontal direction. The secondary screening cylinder 2 is sleeved outside the primary screening cylinder 1, and the outer sleeve 3 is sleeved outside the secondary screening cylinder 2. The primary screening cylinder 1 and the secondary screening cylinder 2 can be rotatably connected to the outer sleeve 3 around their own axes.

[0035] This agricultural material sorting machine is capable of performing multi-stage screening of agricultural materials of different sizes. The primary screening cylinder 1 and the secondary screening cylinder 2, with their different screen aperture designs, screen larger and smaller materials respectively, while the tertiary screen aperture 301 at the bottom of the outer cylinder 3 further screens the smallest materials. This multi-stage screening structure significantly improves screening efficiency and accuracy. Simultaneously, the coaxial arrangement and horizontal axis design ensure the flowability of materials during the screening process, effectively preventing clogging.

[0036] like Figure 2 As shown, specifically, it also includes a primary transmission mechanism, which includes an input shaft 5, a primary external gear ring 6, a primary sun gear 7, multiple primary planetary gears 8, and a primary planetary carrier 9. The primary sun gear 7 is coaxially and fixedly connected to the primary screening cylinder 1. The input shaft 5 is fixedly connected to the primary sun gear 7 through a connecting rod 10. The primary external gear ring 6 is coaxially and fixedly connected to the secondary screening cylinder 2. The primary planetary carrier 9 has carrier feet and carrier rings. The primary planetary carrier 9 is fixedly connected to the end cover 302 through the carrier feet. The primary planetary gears 8 can rotate around their own axes and are rotatably connected to the carrier feet of the primary planetary carrier 9 through bearings. The primary planetary gears 8 mesh with the primary external gear ring 6 and the primary sun gear 7 respectively.

[0037] Input shaft 5, serving as the component receiving external power, is fixedly connected to the primary sun gear 7 via connecting rod 10. As input shaft 5 rotates, primary sun gear 7 rotates accordingly. Since primary sun gear 7 is coaxially fixed to primary screening cylinder 1, primary screening cylinder 1 also rotates with primary sun gear 7, thus completing the screening of materials within primary screening cylinder 1 through its rotation. Primary planetary gears 8 mesh with primary external gear ring 6 and primary sun gear 7 respectively. Due to the fixed connection between primary planetary carrier 9 and end cover 302, when primary sun gear 7 rotates, primary planetary gears 8 can only rotate around their own axes. Primary external gear ring 6 is coaxially fixed to secondary screening cylinder 2. The meshing of primary planetary gears 8 and primary external gear ring 6 causes primary external gear ring 6 and the coaxially fixed secondary screening cylinder 2 to rotate under driving force as primary planetary gear 8 rotates, thereby achieving the screening of materials within secondary screening cylinder 2.

[0038] like Figure 2 As shown, it also includes a secondary transmission mechanism, which includes a secondary external gear ring 11, a secondary sun gear 12, multiple secondary planetary gears 13, and a secondary planetary carrier 14. The secondary sun gear 12 is sleeved outside the primary external gear ring 6 and is integrally formed with the primary external gear ring 6. The secondary external gear ring 11 is coaxially and fixedly connected to the outer sleeve 3. The secondary planetary carrier 14 has carrier feet and carrier rings. The secondary planetary gears 13 are rotatably connected to the carrier feet of the secondary planetary carrier 14 through bearings around their own axes, and the secondary planetary gears 13 mesh with the secondary external gear ring 11 and the secondary sun gear 12 respectively.

[0039] Power is input from the secondary sun gear 12, which begins to rotate. Since the secondary external gear ring 11 is coaxially and fixedly connected to the outer sleeve 3, it remains stationary. The secondary planetary gear 13 meshes with both the secondary sun gear 12 and the secondary external gear ring 11. When the secondary sun gear 12 rotates, it drives the secondary planetary gear 13 to rotate on its own axis while simultaneously revolving around the center of the secondary sun gear 12, maintaining its meshing relationship with the secondary external gear ring 11. The revolution of the secondary planetary gear 13 is transmitted to the secondary planetary carrier 14 via the carrier legs; therefore, when the secondary planetary gear 13 revolves, it drives the secondary planetary carrier 14 to rotate as well. This secondary transmission mechanism ensures more stable rotation of the secondary screening cylinder 2, guaranteeing reliable power transmission, and also lays the foundation for the subsequent installation of the outer brush rod 15.

[0040] To ensure more uniform power transmission in the agricultural material sorting machine, two primary and two secondary transmission mechanisms are used, located at opposite ends within the outer sleeve 3. This layout effectively improves the stability of the transmission system, reduces equipment wear caused by uneven force distribution on one side, and thus extends the equipment's service life. Furthermore, the dual-end transmission mechanism design enhances the smoothness of the screening cylinder's rotation, further improving the material screening effect and efficiency.

[0041] like Figure 3 As shown, it also includes an outer brush rod 15 and an inner brush rod 16. The two ends of the outer brush rod 15 are fixedly connected to the rings of the secondary planetary carrier 14, and the two ends of the inner brush rod 16 are fixedly connected to the rings of the primary planetary carrier 9. The outer brush rod 15 has bristles on both sides for abutting against the outer wall of the secondary screening cylinder 2 and the inner wall of the outer sleeve 3, and the inner brush rod 16 has bristles on both sides for abutting against the outer wall of the primary screening cylinder 1 and the inner wall of the secondary screening cylinder 2.

[0042] The bristles on the outer brush rod 15 fit closely against the outer wall of the secondary screening cylinder 2 and the inner wall of the outer sleeve cylinder 3, effectively cleaning the material adhering between them. The bristles on the inner brush rod 16 contact the outer wall of the primary screening cylinder 1 and the inner wall of the secondary screening cylinder 2, removing any remaining material between them. The outer brush rod 15 and inner brush rod 16 not only significantly improve the cleaning efficiency of the equipment and reduce clogging, but also ensure the continuity and stability of the sorting process.

[0043] like Figure 1 As shown, in order to provide power to the primary transmission mechanism, the agricultural material sorting machine also includes a motor 17. The motor 17 is located outside the outer sleeve 3 and is fixedly connected to the end cover 302. The output end of the motor 17 passes through the end cover 302 and is driven by the input shaft 5.

[0044] The motor 17 is mounted outside the outer sleeve 3 and fixedly connected to the end cover 302, making the overall structure more compact and facilitating the installation and maintenance of the motor 17. The output end of the motor 17 is driven by the input shaft 5, realizing the effective transmission of power and ensuring the stable rotation of the primary screening cylinder 1 and the secondary screening cylinder 2.

[0045] like Figure 1 As shown, in order to feed the material to be screened into the agricultural material sorting machine, the end cover 302, which is not connected to the motor 17, is provided with a feed inlet 303 that communicates with the inside of the primary screening cylinder 1. The feed inlet 303 on the end cover 302, which communicates with the inside of the primary screening cylinder 1, allows the material to directly enter the primary screening cylinder 1 for screening.

[0046] like Figure 1 and Figure 2 As shown, the bottom of the outer sleeve 3 is provided with a first compartment door 304, the secondary screening cylinder 2 is provided with a second compartment door 202, and the tertiary screen holes 301 are all located at the first compartment door 304.

[0047] The three-stage sieve openings 301 are concentrated in the area of ​​the first chamber door 304, facilitating the third-stage screening and centralized discharge of the material remaining after the second-stage screening. The first chamber door 304 also facilitates equipment maintenance and cleaning. After collecting the material after the third-stage screening, opening the first chamber door 304 allows collection of the material that has undergone two stages of screening and remains between the outer casing 3 and the secondary screening casing 2. Similarly, the second chamber door 202 also facilitates equipment maintenance and cleaning. After collecting the material after two stages of screening by opening the first chamber door 304, opening the second chamber door 202 allows collection of the material that has undergone the first-stage screening and remains between the primary screening casing 1 and the secondary screening casing 2. The remaining material in the primary screening casing 1 can be removed by removing the end cover 302.

[0048] The implementation principle of an agricultural material sorting machine according to an embodiment of this application is as follows: Motor 17 starts, and its output end is connected to input shaft 5 via end cover 302, providing power to the entire transmission system. Input shaft 5 drives the primary sun gear 7 to rotate. Since the primary sun gear 7 is coaxially and fixedly connected to the primary screening cylinder 1, the primary screening cylinder 1 also rotates accordingly. The screen holes on the primary screening cylinder 1 are designed to screen larger-sized materials, which fall through the screen holes into the secondary screening cylinder 2 below during rotation.

[0049] Simultaneously, the primary planetary gear 8 meshes with the primary sun gear 7 and the primary external gear ring 6. The primary external gear ring 6 is coaxially and fixedly connected to the secondary screening cylinder 2. Therefore, as the primary planetary gear 8 rotates, the primary external gear ring 6 and the secondary screening cylinder 2 are also driven to rotate. The screen aperture on the secondary screening cylinder 2 is smaller than that of the primary screen aperture 101, and is used for further screening of smaller-sized materials.

[0050] Next, power is transmitted to the secondary transmission mechanism. The secondary sun gear 12 is fitted around the primary external gear ring 6 and is integrally formed with it, thus rotating along with it. The secondary external gear ring 11 is coaxially and fixedly connected to the outer sleeve 3, remaining stationary. The secondary planetary gear 13 meshes with both the secondary sun gear 12 and the secondary external gear ring 11. When the secondary sun gear 12 rotates, it drives the secondary planetary gear 13 to rotate on its own axis while simultaneously revolving around the center of the secondary sun gear 12. The revolution of the secondary planetary gear 13 is transmitted to the secondary planetary carrier 14 through the support legs, causing the secondary planetary carrier 14 to rotate as well, thereby enhancing the stability of the rotation of the secondary screening cylinder 2.

[0051] During the screening process, the outer brush rod 15 and the inner brush rod 16 serve a cleaning function. The bristles on the outer brush rod 15 closely adhere to the outer wall of the secondary screening cylinder 2 and the inner wall of the outer sleeve 3, removing adhering material. The bristles on the inner brush rod 16 contact the outer wall of the primary screening cylinder 1 and the inner wall of the secondary screening cylinder 2, removing material residue. This greatly improves the cleaning efficiency of the equipment and reduces the occurrence of clogging.

[0052] After three-stage screening, the material is divided into four parts of different sizes. The three-stage screen openings 301 are concentrated in the first compartment door 304 area at the bottom of the outer sleeve 3, facilitating the centralized discharge of the smallest sized material after screening. The first compartment door 304 facilitates the collection and cleaning of material remaining between the secondary screening cylinder 2 and the outer sleeve 3 after secondary screening. Simultaneously, the second compartment door 202 is located on the secondary screening cylinder 2, facilitating the collection and cleaning of material remaining between the primary screening cylinder 1 and the secondary screening cylinder 2 after primary screening. The remaining material in the primary screening cylinder 1 can be removed by removing the end cap 302.

[0053] The entire screening process is continuous and stable, and the multi-stage screening structure significantly improves screening efficiency and accuracy. Meanwhile, the coaxial arrangement and horizontal axis design ensure the flowability of materials during screening, effectively preventing clogging.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An agricultural material sorting machine, characterized in that, include: Primary screening cylinder (1), secondary screening cylinder (2), and outer casing (3); The outer sleeve (3) is provided with end caps (302) at both ends. The primary screening cylinder (1) is provided with primary screening holes (101), the secondary screening cylinder (2) is provided with secondary screening holes (201), the aperture of the secondary screening holes (201) is smaller than that of the primary screening holes (101), the bottom of the outer sleeve (3) is provided with tertiary screening holes (301), the aperture of the tertiary screening holes (301) is smaller than that of the secondary screening holes (201), and the bottom of the outer sleeve (3) is also provided with support legs (4). The primary screening cylinder (1), the secondary screening cylinder (2), and the outer sleeve (3) are all coaxially arranged, and their axes are parallel to the horizontal direction. The secondary screening cylinder (2) is sleeved outside the primary screening cylinder (1), and the outer sleeve (3) is sleeved outside the secondary screening cylinder (2). The primary screening cylinder (1) and the secondary screening cylinder (2) can both be rotatably connected to the outer sleeve (3) around their own axes.

2. The agricultural material sorting machine according to claim 1, characterized in that, It also includes a primary transmission mechanism, which comprises an input shaft (5), a primary external gear ring (6), a primary sun gear (7), multiple primary planetary gears (8), and a primary planet carrier (9). The primary sun gear (7) is coaxially and fixedly connected to the primary screening cylinder (1). The input shaft (5) is fixedly connected to the first-stage sun gear (7) via a connecting rod (10). The primary external gear ring (6) is coaxially and fixedly connected to the secondary screening cylinder (2). The first-stage planetary carrier (9) has a carrier foot and a carrier ring. The first-stage planetary carrier (9) is fixedly connected to the end cover (302) through the carrier foot. The first-stage planetary gear (8) is rotatably connected to the carrier foot of the first-stage planetary carrier (9) through a bearing around its own axis. The first-stage planetary gear (8) meshes with the first-stage external gear ring (6) and the first-stage sun gear (7) respectively.

3. The agricultural material sorting machine according to claim 2, characterized in that, It also includes a secondary transmission mechanism, which comprises a secondary external gear ring (11), a secondary sun gear (12), multiple secondary planetary gears (13), and a secondary planet carrier (14). The secondary sun gear (12) is fitted around the primary external gear ring (6) and is integrally formed with the primary external gear ring (6). The secondary external gear ring (11) is coaxially and fixedly connected to the outer sleeve (3). The secondary planetary carrier (14) has carrier legs and carrier rings. The secondary planetary gear (13) is rotatably connected to the carrier legs of the secondary planetary carrier (14) via bearings around its own axis. The secondary planetary gear (13) meshes with the secondary external gear ring (11) and the secondary sun gear (12) respectively.

4. The agricultural material sorting machine according to claim 3, characterized in that, There are two primary transmission mechanisms and two secondary transmission mechanisms, which are located at opposite ends of the outer sleeve (3).

5. The agricultural material sorting machine according to claim 4, characterized in that, It also includes an outer brush rod (15) and an inner brush rod (16). The two ends of the outer brush rod (15) are fixedly connected to the ring of the secondary planetary carrier (14), and the two ends of the inner brush rod (16) are fixedly connected to the ring of the primary planetary carrier (9). The outer brush rod (15) has bristles on both sides for abutting against the outer wall of the secondary screening cylinder (2) and the inner wall of the outer sleeve (3). The inner brush rod (16) has bristles on both sides for abutting against the outer wall of the primary screening cylinder (1) and the inner wall of the secondary screening cylinder (2).

6. The agricultural material sorting machine according to claim 5, characterized in that, It also includes a motor (17), which is located outside the outer sleeve (3) and fixedly connected to the end cover (302). The output end of the motor (17) passes through the end cover (302) and is driven to connect to the input shaft (5).

7. The agricultural material sorting machine according to claim 6, characterized in that, The end cap (302) not connected to the motor (17) is provided with a feed inlet (303) that communicates with the inside of the primary screening cylinder (1).

8. The agricultural material sorting machine according to claim 1, characterized in that, The bottom of the outer sleeve (3) is provided with a first door (304), and the three-stage sieve holes (301) are all located in the first door (304).

9. The agricultural material sorting machine according to claim 8, characterized in that, The secondary screening cylinder (2) is equipped with a second compartment door (202).

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