A screening type shaking drying device for seed production

Abstract

The application discloses a screening type shaking drying device for seed production and relates to the field of seed treatment.The screening type shaking drying device comprises a drying box, a plurality of electric heating plates are installed on the inner wall of the drying box, a drying cavity is arranged in the drying box, a feeding port communicating with the drying cavity is formed in the top of the drying box, a shaking type screening mechanism is arranged in the drying cavity, the shaking type screening mechanism comprises a screening frame, a screening shaft, a shaking rod and a deflection sleeve, the screening shaft is rotatably installed on the drying box, the deflection sleeve is fixedly sleeved on the screening shaft, the screening frame is slidably installed on the deflection sleeve, the screening frame has the freedom of moving along the axial direction of the screening shaft, the shaking rod is slidably installed on the drying box, the shaking rod is parallel to the screening shaft, the screening frame is located on the moving path of the shaking rod, and the artificial jolting action is simulated, so that the seeds at the bottom of the screening frame can move to the upper layer and then are subjected to vibration drying.

Description

Technical Field

[0001] This invention relates to the field of seed treatment, specifically to a sieving-type shaking drying device for seed production. Background Technology

[0002] As a core input in agricultural production, the quality of seeds directly determines crop yield and stress resistance. Drying and screening are key pretreatment steps in seed production and processing. After harvesting, seeds need to have excess moisture removed (typically requiring a moisture content of 8%–12%) to prevent mold growth and decreased germination rates during storage. Simultaneously, screening is necessary to separate impurities, broken seeds, and seeds of different sizes, ensuring seed purity and sowing uniformity. Therefore, the efficiency, uniformity, and preservation of seed integrity during drying and screening are core requirements for the development of seed processing equipment.

[0003] In existing seed processing procedures, drying and screening are often carried out in separate steps using independent equipment: first, moisture is removed using equipment such as static drying boxes and belt dryers, and then the seeds are transferred to devices such as vibrating screens and drum screens for grading. This model has significant drawbacks: on the one hand, the step-by-step operation leads to cumbersome procedures and time-consuming transportation, and the seeds are prone to absorbing environmental moisture during transportation, causing secondary moisture absorption and affecting the drying effect; on the other hand, the connection between independent equipment requires additional manual intervention, which not only increases labor intensity but may also cause seed damage due to mechanical collisions during transportation, especially for seeds with fragile skins such as beans and vegetables.

[0004] To address the drawbacks of step-by-step operations, integrated drying and screening devices have gradually emerged in the industry. However, existing integrated equipment still faces several technical bottlenecks: Firstly, insufficient drying uniformity: Most devices use fixed heating plates combined with a single shaking mechanism, causing seeds to easily accumulate in the screening area. This results in over-drying of surface seeds and residual moisture in the bottom seeds, with a drying temperature gradient difference of 5-8℃, severely affecting the consistency of seed germination rates. Although some devices have added stirring structures, the stirring blades easily scratch the seed coat, resulting in a breakage rate as high as 3%-5%. Secondly, a lack of screening accuracy and flexibility: The screening mechanisms of existing devices are mostly based on a single vibration mode, with fixed amplitude and frequency of the screening frame. This cannot adapt to the grading requirements of seeds with different particle sizes (such as wheat with a particle size of 2.5-3.5mm and rapeseed with a particle size of 1.5-2.0mm). Furthermore, during vibration, seeds easily slip along the edge of the screening frame, resulting in a screening pass rate of only 60%-70%, requiring repeated screening, which is inefficient. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sieving-type shaking drying device for seed production, thereby solving the deficiencies of the prior art.

[0006] The objective of this invention is achieved through the following technical solution: a sieving-type vibrating drying device for seed production, comprising a drying box, wherein a plurality of electric heating plates are installed on the inner wall of the drying box, a drying chamber is provided inside the drying box, and a feed inlet communicating with the drying chamber is opened at the top of the drying box. A vibrating sieving mechanism is provided inside the drying chamber, the vibrating sieving mechanism comprising a sieving frame, a sieving shaft, a vibrating rod, and a deflecting sleeve. The sieving shaft is rotatably mounted on the drying box, the deflecting sleeve is fixedly mounted on the sieving shaft, the sieving frame is slidably mounted on the deflecting sleeve, the sieving frame has a degree of freedom to move axially along the sieving shaft, the vibrating rod is slidably mounted on the drying box, the vibrating rod is parallel to the sieving shaft, and the sieving frame is located on the movement path of the vibrating rod.

[0007] Furthermore, the top surface of the deflection sleeve is provided with an inverted T-shaped groove, and the bottom of the screening frame is fixed with an inverted T-shaped slider, which slides and adapts to the inverted T-shaped groove.

[0008] Furthermore, a drive box is installed on the outer wall of the drying oven, two shaking rods are arranged opposite each other, the screening frame is located between the two shaking rods, the shaking rods are connected to L-shaped drive rods, the L-shaped drive rods slide into the drive box, the two L-shaped drive rods move in the same direction, a drive shaft is rotatably arranged inside the drive box, the drive shaft is connected to a gear, both L-shaped drive rods are connected to a first rack, and both first racks mesh with the gear.

[0009] Furthermore, a second rack is slidably disposed inside the drive box, the second rack meshing with a gear, a drive motor is mounted on the drive box, the output shaft of the drive motor is connected to a drive disk, a rocker arm is disposed inside the drive box, one end of the rocker arm is eccentrically rotatably mounted on the drive disk, and the other end is rotatably connected to the second rack.

[0010] Furthermore, the side wall of the drying chamber has a shaft hole for the screening shaft to pass through, and the outer wall of the drying chamber has a large-diameter hole with a diameter larger than that of the shaft hole. A hollow switching sleeve is installed inside the large-diameter hole and is rotatably mounted inside the large-diameter hole via a bearing. A torsion spring is fixedly fitted on the hollow switching sleeve. A foot hole is provided on the inner wall of the large-diameter hole, and the torsion foot of the torsion spring is inserted into the foot hole. A docking cone is provided on the inner wall of the hollow switching sleeve, and the docking cone has a degree of freedom to move radially along the hollow switching sleeve. A docking hole is provided on the outer wall of the screening shaft, and the docking cone is fitted into the docking hole.

[0011] Furthermore, a drive assembly is provided on the side wall of the drying oven. The drive assembly includes a base plate, a motor mounting plate, a motor, and a cylinder. The base plate is fixed to the outer wall of the drying oven. The motor mounting plate is slidably mounted on the base plate. The motor is mounted on the motor mounting plate. The output shaft of the motor is connected to a drive gear. The screening shaft is connected to a driven gear. The driven gear meshes with the drive gear. The cylinder is mounted on the base plate. The telescopic shaft of the cylinder is connected to the motor mounting plate.

[0012] Furthermore, the inner wall of the hollow switching sleeve is provided with an installation groove, an electromagnet is installed in the installation groove, one end of the docking cone is slidably adapted in the installation groove and a permanent magnet is installed thereon, the electromagnet generates a magnetic pole with a magnetic field opposite to that of the permanent magnet when energized, a switching spring is installed in the installation groove, and the two ends of the switching spring are respectively connected to the hollow switching sleeve and the docking cone.

[0013] Furthermore, a positioning mechanism is installed on the side wall of the drying chamber. The positioning mechanism includes a positioning block, a movable positioning block, and a positioning cylinder. The positioning block is fixed on the side wall of the drying chamber, and a movable positioning block is fixed on the side wall of the screening shaft. The positioning block is located on the rotation path of the movable positioning block. The cylinder body of the positioning cylinder is installed on the drying chamber, and the movable positioning block is located between the positioning block and the positioning cylinder. When the movable positioning block contacts the positioning block, the driving gear meshes with the driven gear.

[0014] Furthermore, the bottom of the drying box is provided with a first discharge port and a second discharge port, and a switching guide plate is provided below the shaking screening mechanism. A switching discharge shaft is fixed in the middle of the switching guide plate. The switching discharge shaft is rotatably connected to the drying box. A switching motor is installed on the outer wall of the drying box, and the output shaft of the switching motor is connected to the switching discharge shaft.

[0015] Furthermore, the drying chamber includes a small-diameter chamber and a large-diameter chamber connected sequentially from top to bottom, the screening frame is disposed in the large-diameter chamber, and the top opening of the screening frame covers the entire small-diameter chamber.

[0016] The beneficial effects of this invention are: 1. The drying and screening functions are integrated into the same drying chamber. After the seeds enter through the feed inlet, they undergo moisture removal and grading directly in the drying chamber, eliminating the need for intermediate transfer. On the one hand, this avoids the drying effect being compromised due to the seeds absorbing environmental moisture during transfer; on the other hand, it reduces mechanical collisions during transfer, and the screening frame uses a combination of sliding and shaking motion instead of a traditional stirring structure, eliminating rigid blades from contacting the seeds and reducing the seed breakage rate.

[0017] 2. The vibrating rod drives the screening frame to move back and forth in a linear motion, causing the screening frame to vibrate and increasing the intensity of seed movement. This makes the surface seeds heat more evenly. After vibrating for a period of time, the screening shaft drives the screening frame to deflect back and forth, simulating artificial shaking. This allows the seeds at the bottom of the screening frame to move to the upper layer, and then vibrate to dry. This process moves the seeds from the lower layer to the upper layer at regular intervals, and the linear vibration ensures that the seeds on the upper layer are fully dried. This effectively avoids the problem of poor drying effect caused by seed accumulation, improving both drying efficiency and drying quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a sieving-type shaking drying device for seed production according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the internal structure of the seed drying box of a sieving and shaking drying device for seed production according to the present invention. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the internal structure of the drive box in a sieving-type shaking dryer for seed production according to the present invention. Figure 5 This is a schematic diagram of the structure of a sieving-type shaking drying device for seed production according to the present invention. Figure 2 ; In the diagram, 1-drying box, 2-drying chamber, 3-feed inlet, 4-screening frame, 5-screening shaft, 6-vibrating rod, 7-deflecting sleeve, 8-electric heating plate, 9-inverted T-shaped chute, 10-inverted T-shaped slider, 11-drive box, 12-L-shaped drive rod, 13-drive shaft, 14-gear, 15-first rack, 16-second rack, 17-drive motor, 18-drive disc, 19-rocker, 20-shaft hole, 21-large diameter hole, 22-hollow switching sleeve, 2 3-Torsion spring, 24-Matching cone, 25-Matching hole, 26-Base plate, 27-Motor mounting plate, 28-Motor, 29-Cylinder, 30-Driving gear, 31-Driven gear, 32-Mounting groove, 33-Electromagnet, 34-Permanent magnet, 35-Switching spring, 36-Positioning block, 37-Modible positioning block, 38-Positioning cylinder, 39-First discharge port, 40-Second discharge port, 41-Switching guide plate, 42-Switching feed shaft, 43-Switching motor. Detailed Implementation

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0020] Example 1 like Figures 1 to 5As shown, a sieving-type vibrating drying device for seed production includes a drying box 1. Several electric heating plates 8 are installed on the inner wall of the drying box 1. A drying chamber 2 is provided inside the drying box 1. A feed inlet 3 communicating with the drying chamber 2 is opened at the top of the drying box 1. A vibrating sieving mechanism is installed inside the drying chamber 2. The vibrating sieving mechanism includes a sieving frame 4, a sieving shaft 5, a vibrating rod 6, and a deflecting sleeve 7. The sieving shaft 5 is rotatably mounted on the drying box 1, and the deflecting sleeve 7 is fixedly fitted onto the sieving shaft 5. The screening frame 4 is slidably mounted on the deflecting sleeve 7. The screening frame 4 has the freedom to move axially along the screening axis 5. The shaking rod 6 is slidably mounted on the drying chamber 1, parallel to the screening axis 5. The screening frame 4 is located on the moving path of the shaking rod 6. The seeds to be dried are fed into the drying chamber 1 through the feed inlet 3. The seeds fall into the screening frame 4 and are screened by the screening frame 4. At the same time, the seeds are dried by the electric heating plate 8. This integrates drying and screening, eliminating the need for intermediate transfer. On the one hand, it avoids the drying effect failure caused by the absorption of environmental moisture during seed transfer, ensuring that the moisture content is stably controlled within the target range of 8%-12%. On the other hand, it reduces mechanical collisions during transfer. The screening frame replaces the traditional stirring structure with a combination of sliding and shaking motion, and there are no rigid blades in contact with the seeds, reducing the seed breakage rate to below 0.5%. This is especially suitable for processing seeds with fragile skins, such as beans and vegetables. At the same time, it reduces the intensity of manual intervention and improves the process efficiency by more than 40%. During drying, the vibrating rod 6 first drives the screening frame 4 to move back and forth in a linear motion, causing the screening frame 4 to vibrate and increasing the intensity of seed movement. This ensures that the surface seeds are heated more evenly. After vibrating for a period of time, the screening shaft 5 drives the screening frame 4 to rotate back and forth, simulating a manual shaking motion. This allows the seeds at the bottom of the screening frame 4 to move to the upper layer, where they are then subjected to vibration drying. This process, which moves the lower layer of seeds to the upper layer at regular intervals, ensures that the upper layer of seeds is thoroughly dried through linear vibration. This effectively avoids the problem of poor drying results caused by seed accumulation, improving both drying efficiency and drying quality. After drying is complete, the screening shaft 5 drives the screening frame 4 to rotate 180°, so that the opening of the screening frame 4 faces downwards, allowing the seeds inside the screening frame 4 to fall out, thus completing the discharge operation.

[0021] Example 2 Based on Embodiment 1, the screening frame 4 includes a screening base plate and perforated side plates. The four sides of the top of the screening base plate are all fixed with perforated side plates, and the four perforated side plates are connected end to end. The bottom of the screening base plate is provided with several sieve holes for removing impurities and shriveled or unqualified seeds from the seeds. Hot air can enter the screening frame 4 through the perforated side plates to complete the drying operation of the seeds.

[0022] Example 3 Based on Example 2, such as Figure 1 and Figure 2As shown, the bottom of the drying chamber 1 has a first discharge port 39 and a second discharge port 40. A switching guide plate 41 is located below the vibrating screening mechanism. A switching feed shaft 42 is fixed in the middle of the switching guide plate 41. The switching feed shaft 42 is rotatably connected to the drying chamber 1. A switching motor 43 is installed on the outer wall of the drying chamber 1. The output shaft of the switching motor 43 is connected to the switching feed shaft 42. The drying chamber 2 includes a small-diameter chamber and a large-diameter chamber connected sequentially from top to bottom. The screening frame 4 is located in the large-diameter chamber, and the top opening of the screening frame 4 covers the entire small-diameter chamber, allowing the seeds fed into the drying chamber 1 to completely enter the screening frame 4. During screening, the switching guide plate 41... The lower end of the material plate 41 corresponds to the first discharge port 39, causing the screened impurities to fall onto the switching guide plate 41. The inclined surface of the switching guide plate 41 guides the impurities into the first discharge port 39, through which they are discharged. After drying, the switching motor 43 drives the switching guide plate 41 to rotate 180°, so that the lower end of the switching guide plate 41 corresponds to the second discharge port 40. Then, the screening shaft 5 drives the screening frame 4 to rotate 180°, causing the seeds in the screening frame 4 to fall onto the switching guide plate 41. The switching guide plate 41 guides the seeds into the second discharge port 40, through which the dried seeds are discharged. In specific implementation, a vibrator can be installed on the outer wall of the drying chamber 1 to cause the drying chamber 1 to vibrate, thus preventing impurities or seeds from remaining on the switching guide plate 41.

[0023] Example 4 Based on Example 3, such as Figures 1 to 4As shown, the top surface of the deflecting sleeve 7 is provided with an inverted T-shaped groove 9. The bottom of the screening frame 4 is fixed with an inverted T-shaped slider 10, which slides within the inverted T-shaped groove 9. A drive box 11 is installed on the outer wall of the drying chamber 1. Two shaking rods 6 are arranged opposite each other. The screening frame 4 is located between the two shaking rods 6. The shaking rods 6 are connected to L-shaped drive rods 12, which slide into the drive box 11. The two L-shaped drive rods 12 move in the same direction. A drive shaft 13 is rotatably arranged inside the drive box 11. A gear 14 is connected to the drive shaft 13. Both L-shaped drive rods 12 are connected to first racks 15, which mesh with the gear 14. A second rack 16 is slidably arranged inside the drive box 11, which meshes with the gear 14. A drive motor 17 is installed on the drive box 11. The output shaft of the drive motor 17 is connected to a drive motor 16. A rocker arm 19 is installed inside the drive box 11 and the drive disk 18. One end of the rocker arm 19 is eccentrically mounted on the drive disk 18, and the other end is rotatably connected to the second rack 16. The drive motor 17 drives the drive disk 18 to rotate. The drive disk 18 drives the second rack 16 to reciprocate linearly through the rocker arm 19. The second rack 16 drives the gear 14 to reciprocate. The gear 14 drives the first rack 15 to reciprocate linearly. The first rack 15 drives the vibrating rod 6 to reciprocate linearly through the L-shaped drive rod 12. Since the two L-shaped drive rods 12 move in the same direction and both vibrating rods 6 are in contact with the screening frame 4, the two vibrating rods 6 cooperate to push the screening frame 4 to reciprocate linearly, causing the screening frame 4 to vibrate, thereby improving the drying efficiency and drying effect. The cooperation between the inverted T-shaped groove 9 and the inverted T-shaped slider 10 can prevent the screening frame 4 from falling off.

[0024] Example 5 Based on Example 4, such as Figures 1 to 4As shown, the side wall of the drying chamber 1 has a shaft hole 20 for the screening shaft 5 to pass through. The outer wall of the drying chamber 1 has a large-diameter hole 21, the diameter of which is larger than the diameter of the shaft hole 20. A hollow switching sleeve 22 is installed inside the large-diameter hole 21. The hollow switching sleeve 22 is rotatably mounted inside the large-diameter hole 21 via a bearing. A torsion spring 23 is fixedly sleeved on the hollow switching sleeve 22. A foot hole is opened on the inner wall of the large-diameter hole 21, and the torsion foot of the torsion spring 23 is inserted into the foot hole. A docking cone 24 is provided on the inner wall of the hollow switching sleeve 22. The docking cone 24 has a degree of freedom to move radially along the hollow switching sleeve 22. A docking hole 25 is opened on the outer wall of the screening shaft 5, and the docking cone 24 is fitted into the docking hole 25. A drive assembly is provided on the side wall of the drying chamber 1. The drive assembly includes a base plate 26 and a motor mounting plate. Plate 27, motor 28, and cylinder 29 are mounted on the base plate 26, which is fixed to the outer wall of the drying oven 1. Motor mounting plate 27 is slidably mounted on base plate 26, and motor 28 is mounted on motor mounting plate 27. The output shaft of motor 28 is connected to a drive gear 30, and the screening shaft 5 is connected to a driven gear 31, which meshes with the drive gear 30. Cylinder 29 is mounted on base plate 26, and its telescopic shaft is connected to motor mounting plate 27. A mounting groove 32 is provided on the inner wall of hollow switching sleeve 22, and an electromagnet 33 is installed in the mounting groove 32. One end of the docking cone 24 is slidably fitted into the mounting groove 32 and a permanent magnet 34 is installed therein. When the electromagnet 33 is energized, it generates magnetic poles opposite to those of the permanent magnet 34. A switching spring 35 is installed in the mounting groove 32. The two ends are connected to the hollow switching sleeve 22 and the docking cone 24 respectively. When drying the seeds, the electromagnet 34 is de-energized, and the docking cone 24 is inserted into the docking hole 25 under the force of the switching spring 35, so that the hollow switching sleeve 22 is connected to the screening shaft 5. When it is necessary to shake the screening frame 4, the motor 28 drives the driven gear 31 to rotate through the drive gear 30. The driven gear 31 drives the screening shaft 5 to rotate, so that the screening shaft 5 drives the screening frame 4 to deflect at a certain angle. This angle is less than 45° to ensure that the seeds in the screening frame 4 will not overflow, and at the same time to avoid excessive deformation of the torsion spring 23. The screening shaft 5 drives the hollow switching sleeve 22 to deflect, and the hollow switching sleeve 22 causes the torsion spring 23 to deform. Then the cylinder 29 drives the motor 28 to move, so that the drive gear 30... Separating from the driven gear 31, the reaction force of the torsion spring 23 is immediately released. Under the action of the torsion spring 23, the screening frame 4 produces a reciprocating deflection motion with a gradually decreasing deflection amplitude. This flips the seeds at the bottom upwards, and then through linear motion, the upper layer of seeds moves frequently. At the same time, the reciprocating deflection causes the accumulated seeds to spread out, improving drying efficiency. When the screening frame is shaken again, the cylinder 29 drives the motor 28 to reset, causing the driving gear 30 to re-mesh the driven gear 31, repeating the above operation process to complete the reciprocating deflection motion of the screening frame 4. After the seeds are dried, the electromagnet 34 is energized to attract the permanent magnet 34, causing the docking cone 24 to disengage from the docking hole 25, and the hollow switching sleeve 22 to separate from the screening shaft 5.Then, the motor 28 drives the screening shaft 5 to rotate through the meshing of the driving gear 30 and the driven gear 31. The screening shaft 5 drives the screening frame 4 to rotate 180°, so that the opening of the screening frame 4 faces downward, allowing the screened seeds to fall. At this time, the screening shaft 5 will not drive the hollow switching sleeve 23 to deflect, preventing the torsion spring 23 from being over-affected and damaged, thus extending the service life of the torsion spring 23.

[0025] Example 6 Based on Example 5, such as Figures 1 to 5 As shown, a positioning mechanism is installed on the side wall of the drying chamber 1. The positioning mechanism includes a positioning block 36, a movable positioning block 37, and a positioning cylinder 38. The positioning block 36 is fixed on the side wall of the drying chamber 1, and the movable positioning block 37 is fixed on the side wall of the screening shaft 5. The positioning block 36 is located on the rotation path of the movable positioning block 37. The cylinder body of the positioning cylinder 38 is installed on the drying chamber 1. The movable positioning block 37 is located between the positioning block 36 and the positioning cylinder 38. When the movable positioning block 37 contacts the positioning block 36, the driving gear 30 meshes with the driven gear 31. When the driving gear 30 and the driven gear 31 separate, the screening frame 4, under the gravity of the seeds inside, causes the screening shaft 5 to compress the torsion spring 23 and slightly deflect at a certain angle, resulting in the main... Since the driving gear 30 cannot re-engage with the driven gear 31, when the driving gear 30 re-engages with the driven gear 31, the positioning cylinder 38 is activated first. The telescopic shaft of the positioning cylinder 38 extends and pushes the movable positioning block 37 to deflect. The movable positioning block 37 drives the screening shaft 5 and the screening frame 4 on it to deflect. When the movable positioning block 37 contacts the positioning block 36, the positioning cylinder 38 stops extending, thus completing the positioning of the screening shaft 5. Then, the cylinder 29 drives the motor mounting plate 27 to reset, so that the driving gear 30 re-engages with the driven gear 31, and the reciprocating deflection motion of the screening frame resumes. After the driving gear 30 engages with the driven gear 31, the positioning cylinder 38 resets, thus not affecting the deflection motion of the screening shaft 5.

Claims

1. A sieving-type shaking drying device for seed production, comprising a drying chamber (1), wherein a plurality of electric heating plates (8) are installed on the inner wall of the drying chamber (1), characterized in that, The drying box (1) is provided with a drying chamber (2). The top of the drying box (1) is provided with a feed inlet (3) that connects to the drying chamber (2). The drying chamber (2) is provided with a shaking screening mechanism. The shaking screening mechanism includes a screening frame (4), a screening shaft (5), a shaking rod (6), and a deflection sleeve (7). The screening shaft (5) is rotatably mounted on the drying box (1). The deflection sleeve (7) is fixedly mounted on the screening shaft (5). The screening frame (4) is slidably mounted on the deflection sleeve (7). The screening frame (4) has the freedom to move along the axial direction of the screening shaft (5). The shaking rod (6) is slidably mounted on the drying box (1). The shaking rod (6) is parallel to the screening shaft (5). The screening frame (4) is located on the moving path of the shaking rod (6).

2. The sieving-type shaking drying device for seed production according to claim 1, characterized in that, The top surface of the deflection sleeve (7) is provided with an inverted T-shaped groove (9), and the bottom of the screening frame (4) is fixed with an inverted T-shaped slider (10), which slides and adapts to the inverted T-shaped groove (9).

3. The sieving-type shaking drying device for seed production according to claim 1, characterized in that, The outer wall of the drying box (1) is equipped with a drive box (11). Two shaking rods (6) are arranged opposite each other. The screening frame (4) is located between the two shaking rods (6). The shaking rods (6) are connected to L-shaped drive rods (12). The L-shaped drive rods (12) slide into the drive box (11). The two L-shaped drive rods (12) move in the same direction. A drive shaft (13) is rotatably arranged inside the drive box (11). The drive shaft (13) is connected to a gear (14). Both L-shaped drive rods (12) are connected to a first rack (15). Both first racks (15) mesh with the gear (14).

4. A sieving-type shaking drying device for seed production according to claim 3, characterized in that, A second rack (16) is slidably disposed inside the drive box (11), and the second rack (16) meshes with a gear (14). A drive motor (17) is installed on the drive box (11), and the output shaft of the drive motor (17) is connected to a drive disk (18). A rocker arm (19) is disposed inside the drive box (11), one end of which is eccentrically mounted on the drive disk (18), and the other end is rotatably connected to the second rack (16).

5. A sieving-type shaking drying device for seed production according to claim 1, characterized in that, The drying box (1) has a shaft hole (20) on its side wall for the screening shaft (5) to pass through. The drying box (1) has a large diameter hole (21) on its outer wall. The diameter of the large diameter hole (21) is larger than the diameter of the shaft hole (20). A hollow switching sleeve (22) is provided in the large diameter hole (21). The hollow switching sleeve (22) is rotatably installed in the large diameter hole (21) by bearings. A torsion spring (23) is fixedly sleeved on the hollow switching sleeve (22). A foot hole is provided on the inner wall of the large diameter hole (21). The torsion foot of the torsion spring (23) is inserted into the foot hole. A docking cone (24) is provided on the inner wall of the hollow switching sleeve (22). The docking cone (24) has a degree of freedom to move radially along the hollow switching sleeve (22). A docking hole (25) is provided on the outer wall of the screening shaft (5). The docking cone (24) is adapted to the docking hole (25).

6. A sieving-type shaking drying device for seed production according to claim 5, characterized in that, The drying chamber (1) is provided with a drive assembly on its side wall. The drive assembly includes a base plate (26), a motor mounting plate (27), a motor (28), and a cylinder (29). The base plate (26) is fixed on the outer wall of the drying chamber (1). The motor mounting plate (27) is slidably mounted on the base plate (26). The motor (28) is mounted on the motor mounting plate (27). The output shaft of the motor (28) is connected to a drive gear (30). The screening shaft (5) is connected to a driven gear (31). The driven gear (31) meshes with the drive gear (30). The cylinder (29) is mounted on the base plate (26). The telescopic shaft of the cylinder (29) is connected to the motor mounting plate (27).

7. A sieving-type shaking drying device for seed production according to claim 5, characterized in that, The inner wall of the hollow switching sleeve (22) is provided with an installation groove (32), an electromagnet (33) is installed in the installation groove (32), one end of the docking cone (24) is slidably adapted in the installation groove (32) and a permanent magnet (34) is installed thereon. When the electromagnet (33) is energized, it generates a magnetic pole that is opposite to the magnetism of the permanent magnet (34). A switching spring (35) is installed in the installation groove (32), and the two ends of the switching spring (35) are respectively connected to the hollow switching sleeve (22) and the docking cone (24).

8. A sieving-type shaking drying device for seed production according to claim 6, characterized in that, The side wall of the drying box (1) is equipped with a positioning mechanism, which includes a positioning block (36), a movable positioning block (37) and a positioning cylinder (38). The positioning block (36) is fixed on the side wall of the drying box (1), and the side wall of the screening shaft (5) is fixed with a movable positioning block (37). The positioning block (36) is located on the rotation path of the movable positioning block (37). The cylinder body of the positioning cylinder (38) is installed on the drying box (1). The movable positioning block (37) is located between the positioning block (36) and the positioning cylinder (38). When the movable positioning block (37) contacts the positioning block (36), the driving gear (30) meshes with the driven gear (31).

9. A sieving-type shaking drying device for seed production according to claim 1, characterized in that, The bottom of the drying box (1) is provided with a first discharge port (39) and a second discharge port (40). A switching guide plate (41) is provided below the shaking screening mechanism. A switching feed shaft (42) is fixed in the middle of the switching guide plate (41). The switching feed shaft (42) is rotatably connected to the drying box (1). A switching motor (43) is installed on the outer wall of the drying box (1). The output shaft of the switching motor (43) is connected to the switching feed shaft (42).

10. A sieving-type shaking drying device for seed production according to claim 1, characterized in that, The drying chamber (2) includes a small-diameter chamber and a large-diameter chamber connected in sequence from top to bottom. The sieve frame (4) is set in the large-diameter chamber, and the top opening of the sieve frame (4) covers the entire small-diameter chamber.

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