Alfalfa seed preliminary cleaning and shelling processing device

Abstract

The invention discloses an alfalfa seed preliminary cleaning and shelling processing device in the technical field of alfalfa seed processing, which comprises a preliminary cleaning and shelling module and a dust suction module mounted on the preliminary cleaning and shelling module, and further comprises a suspension type screening unit arranged below a discharge port of the preliminary cleaning and shelling module, the suspension type screening unit is used for bearing alfalfa materials subjected to preliminary cleaning and conducting secondary screening, swing supporting assemblies are symmetrically arranged on the two sides of the suspension type screening unit, and the swing supporting assemblies are used for movably suspending the suspension type screening unit on the equipment frame; the eccentric linkage module is in transmission connection with a driving shaft of the preliminary cleaning shelling module, and the eccentric linkage module is used for driving the suspension type screening unit to do reciprocating arc swing with the swing supporting assembly as a support; the problems that according to an existing alfalfa preliminary cleaning device, due to the fact that screen holes are fixed, fibers are wound and blocked, shelling is not thorough due to the fact that a kneading effect is lacked, and the seed loss rate is high due to unclear material layering are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alfalfa seed processing, and particularly relates to an alfalfa seed primary cleaning and shelling processing device. BACKGROUND

[0002] Alfalfa is the king of forage grass, and the production and processing of alfalfa seeds are the core link in the chain of animal husbandry. In the process of primary cleaning and shelling of alfalfa seeds, the alfalfa seed particles are small, and are often accompanied by a large amount of long fibrous straw, dry husks and light dust.

[0003] In actual application, the existing cleaning and shelling device has the problems that the long fibers of alfalfa straw are strong and have a large length span, the screen mesh of the traditional vibrating screen is usually fixed in size, the long fibers are easy to cross the screen holes or embed into the gaps, the primary cleaning and screening efficiency is low, and manual cleaning is required frequently; and the primary cleaning and shelling processing equipment usually adopts a single vibration mode or a wind selection structure, and it is difficult to realize efficient self-layering of seed sinking and impurity floating in the cleaning process, and it is also difficult to provide an effective physical rubbing action on the alfalfa pods adhered to the husks, which may cause the fine seeds to be wrapped in long impurities and discharged, and the raw material loss is large, and the actual primary cleaning effect is poor. Therefore, the technical personnel in the field provide an alfalfa seed primary cleaning and shelling processing device to solve the problems in the background art. SUMMARY

[0004] The alfalfa seed primary cleaning and shelling processing device is provided to solve the problems of fiber entanglement and blockage caused by fixed screen holes, incomplete shelling caused by lack of rubbing action, and high seed loss rate caused by unclear material layering.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: an alfalfa seed primary cleaning and shelling processing device, comprising a primary cleaning and shelling module and a dust extraction module installed on the primary cleaning and shelling module, and further comprising: A suspension type screening unit is arranged below the discharge port of the primary cleaning and shelling module, and is used for receiving the alfalfa material after primary cleaning and performing secondary screening. The suspension type screening unit is symmetrically provided with swing support assemblies on both sides, and the swing support assemblies are used for movably suspending the suspension type screening unit on the equipment frame. An eccentric linkage module is in transmission connection with the drive shaft of the primary cleaning and shelling module, and is used for driving the suspension type screening unit to swing in a reciprocating arc line with the swing support assemblies as the support. The kneading grid assembly, mounted on the suspended screening unit, includes fixed strips and movable strips arranged in a horizontally staggered pattern. The equipment frame is provided with a linkage push-pull mechanism whose actuator is connected to the movable strips, so that when the suspended screening unit swings, the relative displacement between the unit and the equipment frame drives the movable strips to reciprocate laterally.

[0006] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: Multiple sets of parallel longitudinal grids are fixedly installed above both the movable and fixed strip groups. The longitudinal grids connected to the movable strip group slide synchronously, and the longitudinal grids that slide with the movable strip group are staggered with the longitudinal grids connected to the fixed strip group.

[0007] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The suspended screening unit includes a retainer that connects to the swing support assembly. Two sets of symmetrically arranged side baffles are fixedly installed on the retainer. The movable strip group and the fixed strip group connected to the top of the two sets of side baffles are arranged at a certain angle in the longitudinal direction, and the bottom of the side baffles is connected to a screen plate that is inclined in the opposite direction to the movable strip group and the fixed strip group.

[0008] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The movable strip group includes a transverse grid strip disposed between two sets of side baffles. Both ends of the transverse grid strip are fixedly installed with sliding rods that slide through the adjacent side baffles. The end of the sliding rod on one side is equipped with a push-pull plate that connects to the linkage push-pull mechanism.

[0009] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The transverse grids of both the movable and fixed grids are trapezoidal in shape, creating a screening gap that is wider at the top and narrower at the bottom between adjacent transverse grids. The longitudinal grids are circular or elliptical in shape.

[0010] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: A flexible curtain embedded in the screening gap is fixedly installed on the longitudinal grid strip, and the flexible curtain is in contact with the surface of the transverse grid strip.

[0011] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The linkage push-pull mechanism includes a positioning bracket that can be detachably installed on the equipment frame. Two sets of first connecting rods are rotatably installed on the positioning bracket. Vertical rods are provided at the ends of the two sets of first connecting rods. Sliding seats are slidably installed on the surface of the vertical rods. Second connecting rods are rotatably installed on the sliding seats. A mounting seat that is hinged to the end of the second connecting rod is detachably installed on the push-pull plate.

[0012] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The swing support assembly includes a rotating rod rotatably mounted on the equipment frame, a support screw detachably mounted on the rotating rod, and a connecting seat at the bottom end of the support screw. The connecting seat is detachably connected to the retainer by a long bolt.

[0013] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The eccentric linkage module includes a rotating shaft rotatably mounted on the equipment frame, an eccentric wheel fixedly mounted at the end of the rotating shaft, the eccentric wheel being connected to the retainer via a third connecting rod, and a transmission wheel connected to the drive shaft of the initial cleaning and descrambling module, the transmission wheel and the eccentric wheel being coupled together via a rubber strip.

[0014] As a further description of the above-mentioned alfalfa seed primary cleaning and dehulling processing device: The dust extraction module is connected to a dust extraction box that extends from the bottom to above the sieve plate. The dust extraction box has multiple sets of dust extraction openings on the side facing the kneading grid assembly.

[0015] In summary, due to the use of the above-mentioned alfalfa seed primary cleaning and dehulling processing device, the beneficial effects of this invention are: A dynamically changing three-dimensional grid is constructed above the screen surface through transverse trapezoidal grids and synchronously interlaced longitudinal grids. The continuous kneading and pushing force generated by this interlaced displacement, and the washboard effect generated by the transverse sliding of the moving strips, not only crush the shells but also periodically cut off the supporting force of long fiber impurities. While performing efficient dehulling, it can also effectively prevent impurities from clogging the mesh. The fixed and moving strip structures used for screening are simultaneously kneaded by the linkage push-pull mechanism during the oscillating screening process, which can efficiently achieve the upper and lower stratification of the material to be screened, reduce material loss, and achieve absolute synchronization between the oscillation frequency and the kneading frequency. The trapezoidal cross-section V-shaped gap combined with the embedded flexible curtain can achieve efficient and non-destructive dehulling of fine materials. The flexible curtain performs scraper-like cleaning on the inclined surface of the gap, forcibly pushing away impurities of critical size. This active self-cleaning ensures that the screen surface always remains fully open under heavy load processing, without the need for frequent shutdowns. Attached Figure Description

[0016] Figure 1 This is a first schematic diagram of the overall structure of the present invention; Figure 2 This is a second schematic diagram of the overall structure of the present invention; Figure 3 This is a side view of the overall structure of the present invention; Figure 4 This is a first sectional view of the overall structure of the present invention; Figure 5 This is a second sectional view of the overall structure of the present invention; Figure 6 for Figure 4 Enlarged view of the A-structure in the middle; Figure 7 for Figure 4 Enlarged view of the B-structure; Figure 8 for Figure 5 Enlarged view of the C-structure.

[0017] Legend: 10. Initial cleaning and shelling module; 11. Dust extraction module; 12. Equipment frame; 14. Longitudinal grid strips; 15. Flexible curtain; 16. Dust collection box; 17. Dust collection opening; 20. Suspended screening unit; 201. Holder; 202. Side baffle; 203. Screen plate; 30. Swing support assembly; 301. Rotating rod; 302. Support screw; 303. Connecting seat; 304. Long bolt; 40. Eccentric linkage module; 401. Rotating shaft; 402. Eccentric wheel; 403. Third link; 404. Transmission wheel; 405. Rubber strip; 50. Twisted grid assembly; 501. Fixed strip assembly; 502. Movable strip assembly; 5021. Transverse grid strip; 5022. Slide bar; 5023. Push-pull plate; 60. Linkage push-pull mechanism; 601. Positioning bracket; 602. First link; 603. Vertical rod; 604. Sliding seat; 605. Second link; 606. Mounting seat. Detailed Implementation

[0018] The following will describe, with reference to the accompanying drawings of the embodiments of the present invention, a clear and complete alfalfa seed primary cleaning and dehulling processing device of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-8As shown, the present invention provides an alfalfa seed primary cleaning and dehulling processing device, comprising a primary cleaning and dehulling module 10 and a dust extraction module 11 installed on the primary cleaning and dehulling module 10. It can be directly used for the preliminary cleaning and processing of alfalfa seeds with a large amount of straw after harvest. The material to be processed is fed into the primary cleaning and dehulling module 10 through its inlet. The rotating structure inside the primary cleaning and dehulling module 10, in conjunction with a fixed inner mesh, can initially separate the seeds from the pods. This is a mature existing technology and will not be elaborated further here. After primary cleaning, the material is output from the outlet for subsequent primary cleaning and dehulling processing. The dust extraction module 11, which communicates with the inner cavity of the primary cleaning and dehulling module 10, operates synchronously with the primary cleaning and dehulling module 10, allowing for centralized treatment of the dust generated during processing.

[0020] To ensure alfalfa seeds are fully separated from their pods and to effectively prevent fiber entanglement during processing, the processing device also includes a suspended screening unit 20, an eccentric linkage module 40, and a twisting grid assembly 50. The suspended screening unit 20 is positioned below the discharge port of the primary cleaning and dehulling module 10, receiving the primary cleaned alfalfa material for secondary screening. Symmetrical swing support assemblies 30 are arranged on both sides of the suspended screening unit 20, suspending it movably on the equipment frame 12. The eccentric linkage module 40 and... The drive shaft of the initial cleaning and dehulling module 10 is connected to the eccentric linkage module 40, which drives the suspended screening unit 20 to swing back and forth in an arc with the swing support assembly 30 as support. The kneading grid assembly 50 is set on the suspended screening unit 20 and includes fixed strips 501 and movable strips 502 that are distributed laterally. The equipment frame 12 is provided with a linkage push-pull mechanism 60 whose execution end is connected to the movable strips 502. When the suspended screening unit 20 swings, the relative displacement between it and the equipment frame 12 drives the movable strips 502 to slide back and forth in the lateral direction.

[0021] The primary cleaning and dehulling module 10 and the dust extraction module 11 can be directly fixedly assembled onto the equipment frame 12. In actual use, when the alfalfa seed primary cleaning and dehulling processing device is conveyed downwards to the kneading grid assembly 50 after being processed by the primary cleaning and dehulling module 10, the suspended screening unit 20 and its connected kneading grid assembly 50 can reciprocate in an arc under the control of the eccentric linkage module 40. The swing support assembly 30 provides support and limits for the reciprocating swing of the suspended screening unit 20. The material on the screen surface not only has forward momentum but also generates reciprocating jumping motions. Alfalfa seeds have a higher density, while the lighter pods and short stalks have a lower density. During frequent jumping, heavy particles quickly pass through the impurity layer, sink downwards, and contact the kneading grid assembly 50, while light impurities float on the surface. This results in a good spontaneous stratification effect, effectively separating alfalfa seeds from light impurities.

[0022] In this process, the movable strips 502 of the twisting grid assembly 50, while swinging along with the suspended screening unit 20, are guided and restricted by the linkage push-pull mechanism 60, allowing them to move laterally relative to the fixed strips 501. The gap between the movable strips 502 and the fixed strips 501 is used for screening materials. After the alfalfa pods enter the gap, they are no longer statically compressed, but are subjected to a high-frequency shearing force similar to a "washboard." This force can precisely tear the pod shells without crushing the tiny seeds inside, greatly improving the initial cleaning and dehulling rate. Moreover, the screen gaps will produce a certain opening and closing sensation during the movement. Impurities such as straw stuck in the gaps will be laterally moved by the movable strips 502 and have their supporting force cut off. Then, they will be thrown out by the swinging inertia, realizing the active anti-clogging of the screening structure.

[0023] like Figures 1-6 As shown, furthermore, multiple sets of parallel longitudinal grid bars 14 are fixedly installed above both the movable bar group 502 and the fixed bar group 501. The longitudinal grid bars 14 connected to the movable bar group 502 slide synchronously, and the longitudinal grid bars 14 that slide with the movable bar group 502 are staggered with the longitudinal grid bars 14 connected to the fixed bar group 501. The material impurities screened out move longitudinally on the suspended screening unit 20, and the width direction perpendicular to it is transverse. The periodic change in spacing between the moving longitudinal grid strips 14 and the stationary longitudinal grid strips 14 forms a dynamically changing three-dimensional grid above the screen surface. The material is not only kneaded at the bottom layer, but also undergoes preliminary sorting through this dynamic grid strip before entering the bottom layer. The moving longitudinal grid strips 14 exert a continuous pushing force on the long fibers, preventing them from accumulating at the screen holes. Instead, they remain loose and move towards the rear end along the grid strip direction under the swing inertia, effectively and thoroughly solving problems such as fiber clogging. Furthermore, the moving longitudinal grid strips 14 can also evenly push the sinking alfalfa seeds into the kneading gap between the moving strip group 502 and the fixed strip group 501, thereby significantly improving the uniformity of the sieving process.

[0024] In one embodiment, such as Figures 1-7As shown, specifically, the suspended screening unit 20 includes a retainer 201 connected to the swing support assembly 30. Two sets of symmetrically arranged side baffles 202 are fixedly installed on the retainer 201. The movable strip group 502 and the fixed strip group 501 connected to the top of the two sets of side baffles 202 are arranged at a certain angle in the longitudinal direction. The bottom of the side baffles 202 is connected to a screen plate 203 that is inclined in the opposite direction to the movable strip group 502 and the fixed strip group 501. The retainer 201 is used to fix the side baffles 202, the screen plate 203 and the fixed strip group 501, and to provide sliding support for the movable strip group 502. The material after being screened by the movable strip group 502 and the fixed strip group 501 can be further finely screened through the screen plate 203. During the process of the material falling from the upper layer to the lower layer, due to the height difference and the sudden change in the direction of travel, a complete physical flip will occur. The powder and fine pod skins that were originally covering the surface of the seeds are loosened as they fall; at this time, with the help of the precision sieve holes on the reverse inclined surface, the fine impurities can be quickly separated, achieving true secondary fine sieving.

[0025] like Figures 4-8 As shown, specifically, the movable strip group 502 includes transverse grid strips 5021 disposed between two sets of side baffles 202. Both ends of the transverse grid strips 5021 are fixedly equipped with sliding rods 5022 that slide through adjacent side baffles 202. A push-pull plate 5023 connected to a linkage push-pull mechanism 60 is installed at the end of one of the sliding rods 5022. When the transverse grid strips 5021 of the movable strip group 502 swing, they can slide between the two sets of side baffles 202, restricted by the linkage push-pull mechanism 60. The material in the gap between the moving transverse grid strips 5021 and the stationary transverse grid strips 5021 no longer experiences a unidirectional force, but rather a composite force vector. This differential friction can quickly rub open the outer shell of alfalfa seeds, like "kneading with your fingers," with almost no squeezing damage to the kernel, achieving high-quality dehulling.

[0026] Correspondingly, the cross-sectional shape of the transverse grids 5021 of both the movable grid group 502 and the fixed grid group 501 is trapezoidal, creating a screening gap that is wider at the top and narrower at the bottom between adjacent transverse grids 5021. The cross-sectional shape of the longitudinal grids 14 is circular or elliptical, which reduces the carrying force on long fiber impurities. Because the transverse grids 5021 have trapezoidal cross-sections, a V-shaped tapered gap, wider at the top and narrower at the bottom, is formed between adjacent transverse grids 5021. As the material sinks, the transverse compressive force increases linearly with depth, providing the necessary physical pressure gradient for dehulling, quickly peeling away even the smallest, tightly adhered pods. A flexible curtain 15 is fixedly installed on the longitudinal grids 14, embedded in the screening gaps, and the flexible curtain 15 adheres to the surface of the transverse grids 5021. The longitudinal grid 14 slides synchronously with the movable transverse grid 5021, and the flexible curtain 15 at its bottom can sweep across the inclined surface of the V-shaped gap like a scraper. Critical impurities or broken stems whose size is exactly the same as the gap width will be strongly pushed or pushed out of the gap by the flexible curtain 15. This active flexible gap clearing reduces clogging in the screening process and maintains long-term processing efficiency.

[0027] Based on the above embodiments, such as Figures 4-8 As shown, specifically, the linkage push-pull mechanism 60 includes a positioning bracket 601 that can be detachably installed on the equipment frame 12. Two sets of first connecting rods 602 are rotatably installed on the positioning bracket 601. Vertical rods 603 are provided at the ends of the two sets of first connecting rods 602. Sliding seats 604 are slidably installed on the surface of the vertical rods 603. Second connecting rods 605 are rotatably installed on the sliding seats 604. A mounting seat 606 that is hinged to the end of the second connecting rod 605 is detachably installed on the push-pull plate 5023. The swing of the movable transverse grid 5021 can synchronously drive the sliding rod 5022 and the push-pull plate 5023 to swing. During the swing, the push-pull plate 5023 can pull the sliding seat 604 to slide on the surface of the vertical rod 603 through the mounting base 606 and the second connecting rod 605. The sliding seat 604 pulls the vertical rod 603 and the first connecting rod 602 to rotate with the positioning bracket 601 as support. The rotation of the vertical rod 603 and the first connecting rod 602 can cause the sliding seat 604, the second connecting rod 605 and the mounting base 606 to push the push-pull plate 5023 to slide laterally. The entire sliding process is driven by the residual energy of the screen body swing, without the need for an additional power source. Its overall operation is reliable and stable, and the easy-to-disassemble structure is also conducive to the subsequent maintenance and repair of the device.

[0028] In one embodiment, such as Figures 1-7As shown, specifically, the swing support assembly 30 includes a rotating rod 301 rotatably mounted on the equipment frame 12. The rotational connection between the components can be achieved through a bearing seat. A support screw 302 is detachably mounted on the rotating rod 301. A connecting seat 303 is provided at the bottom end of the support screw 302. The connecting seat 303 is detachably connected to the retainer 201 through a long bolt 304. Correspondingly, the eccentric linkage module 40 includes a rotating shaft 401 rotatably mounted on the equipment frame 12. An eccentric wheel 402 is fixedly mounted at the end of the rotating shaft 401. The eccentric wheel 402 is connected to the retainer 201 through a third connecting rod 403. The drive shaft of the initial cleaning and descrambling module 10 is connected to a transmission wheel 404. The transmission wheel 404 and the eccentric wheel 402 are coupled together through a rubber strip 405.

[0029] When the rotating components inside the initial cleaning and shelling module 10 are running, their drive shaft can drive the transmission wheel 404 to rotate. The transmission wheel 404 can drive the eccentric wheel 402 and the rotating shaft 401 to rotate through the torsion rubber strip 405. The rotation of the eccentric wheel 402 can drive the cage 201 to move through the hinged third connecting rod 403. The cage 201 can swing through the long bolt 304 and the connecting seat 303. The connecting seat 303 can drive the support screw 302 and the rotating rod 301 to rotate. Through the multi-point support screw 302, the stable swing of the cage 201 and its connecting structure can be achieved.

[0030] In one embodiment, such as Figures 1-5 As shown, the dust extraction module 11 is connected to a dust collection box 16 extending from its bottom end above the sieve plate 203. The dust collection box 16 has multiple sets of suction openings 17 on the side facing the twisting grid assembly 50. The dust extraction module 11 can collect and clean the dust generated during processing by the suspended screening unit 20 through the dust collection box 16. Heavier alfalfa seeds fall quickly into the lower sieve plate 203 due to gravity, while lighter dust is drawn upwards by the negative pressure of the openings. This reverse hydrodynamic sorting adds an aerodynamic sorting step to the physical screening, greatly enhancing the impurity separation effect.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the alfalfa seed pre-cleaning and dehulling processing device and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. An alfalfa seed primary cleaning and dehulling processing device, comprising a primary cleaning and dehulling module (10) and a dust extraction module (11) installed on the primary cleaning and dehulling module (10), characterized in that, Also includes: The suspended screening unit (20) is located below the discharge port of the primary cleaning and dehulling module (10) and is used to receive the alfalfa material after primary cleaning and perform secondary screening. The suspended screening unit (20) is symmetrically provided with swing support components (30) on both sides. The swing support components (30) are used to suspend the suspended screening unit (20) on the equipment frame (12). The eccentric linkage module (40) is connected to the drive shaft of the primary cleaning and desquamation module (10). The eccentric linkage module (40) is used to drive the suspended screening unit (20) to swing back and forth in an arc with the swing support assembly (30) as support. The kneading grid assembly (50) is disposed on the suspended screening unit (20) and includes a fixed strip group (501) and a movable strip group (502) arranged in a horizontally staggered manner. The equipment frame (12) is provided with a linkage push-pull mechanism (60) whose execution end is connected to the movable strip group (502), so as to drive the movable strip group (502) to reciprocate in the horizontal direction by utilizing the relative displacement between the suspended screening unit (20) and the equipment frame (12) when the suspended screening unit (20) swings.

2. The alfalfa seed primary cleaning and dehulling processing device according to claim 1, characterized in that: Multiple sets of parallel longitudinal grid strips (14) are fixedly installed above both the movable strip group (502) and the fixed strip group (501). The longitudinal grid strips (14) connected to the movable strip group (502) slide synchronously, and the longitudinal grid strips (14) that slide with the movable strip group (502) are staggered with the longitudinal grid strips (14) connected to the fixed strip group (501).

3. The alfalfa seed primary cleaning and dehulling processing device according to claim 2, characterized in that: The suspended screening unit (20) includes a retainer (201) that connects to the swing support assembly (30). Two sets of symmetrically arranged side baffles (202) are fixedly installed on the retainer (201). The movable strip group (502) and the fixed strip group (501) connected to the top of the two sets of side baffles (202) are arranged at a certain angle in the longitudinal direction. The bottom of the side baffles (202) is connected to a screen plate (203) that is inclined in the opposite direction to the movable strip group (502) and the fixed strip group (501).

4. The alfalfa seed primary cleaning and dehulling processing device according to claim 3, characterized in that: The movable strip group (502) includes a transverse grid strip (5021) disposed between two sets of side baffles (202). Both ends of the transverse grid strip (5021) are fixedly installed with slide rods (5022) that slide through the adjacent side baffles (202). The end of the slide rod (5022) on one side is equipped with a push-pull plate (5023) that connects to the linkage push-pull mechanism (60).

5. The alfalfa seed primary cleaning and dehulling processing device according to claim 4, characterized in that: The cross-sectional shape of the transverse grids (5021) of the movable strip group (502) and the fixed strip group (501) is trapezoidal, so that a screening gap with a wider top and a narrower bottom is formed between adjacent transverse grids (5021), and the cross-sectional shape of the longitudinal grids (14) is circular or elliptical.

6. The alfalfa seed primary cleaning and dehulling processing device according to claim 5, characterized in that: A flexible curtain (15) is fixedly installed on the longitudinal grid strip (14) and embedded in the screening gap. The flexible curtain (15) is in contact with the surface of the transverse grid strip (5021).

7. The alfalfa seed primary cleaning and dehulling processing device according to claim 4, characterized in that: The linkage push-pull mechanism (60) includes a positioning bracket (601) that can be detachably installed on the equipment frame (12). Two sets of first connecting rods (602) are rotatably installed on the positioning bracket (601). Vertical rods (603) are provided at the ends of the two sets of first connecting rods (602). Sliding seats (604) are slidably installed on the surface of the vertical rods (603). A second connecting rod (605) is rotatably installed on the sliding seat (604). A mounting seat (606) that is hinged to the end of the second connecting rod (605) is detachably installed on the push-pull plate (5023).

8. The alfalfa seed primary cleaning and dehulling processing device according to claim 3, characterized in that: The swing support assembly (30) includes a rotating rod (301) rotatably mounted on the equipment frame (12), a support screw (302) detachably mounted on the rotating rod (301), a connecting seat (303) provided at the bottom end of the support screw (302), and the connecting seat (303) detachably connected to the retainer (201) by a long bolt (304).

9. The alfalfa seed primary cleaning and dehulling processing device according to claim 3, characterized in that: The eccentric linkage module (40) includes a rotating shaft (401) rotatably mounted on the equipment frame (12). An eccentric wheel (402) is fixedly mounted at the end of the rotating shaft (401). The eccentric wheel (402) is connected to the retainer (201) through a third connecting rod (403). The drive shaft of the primary cleaning and shelling module (10) is connected to a transmission wheel (404). The transmission wheel (404) and the eccentric wheel (402) are coupled together by a rubber strip (405).

10. An alfalfa seed primary cleaning and dehulling processing device according to any one of claims 1-9, characterized in that: The dust extraction module (11) is connected to a dust extraction box (16) extending from the bottom to above the sieve plate (203), and the dust extraction box (16) has multiple sets of dust extraction openings (17) on the side facing the kneading grid assembly (50).

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