Screening device and screening method for golden cypress seedling seeds

Abstract

The invention provides a golden cypress seedling seed screening device and method, and relates to the technical field of golden cypress seedling. The golden cypress seedling seed screening device comprises a screening box, a computer, a negative pressure pump, a vibration disc and a driving motor. According to the method, the multi-angle visual detection and the intelligent algorithm are combined, the surface texture and the three-dimensional shape of the seeds are comprehensively judged, the defects of worm-eaten holes, local mildew, local wizened, color difference abnormity and the like which cannot be detected through traditional mechanical screening can be effectively recognized, the problem of missing detection caused by screening only depending on weight or size is solved, and the screening efficiency is improved. According to the golden cypress seedling culture seed screening device, quality grade data of each seed is recorded based on an automatic sorting process, a traceable screening result is provided for a subsequent seedling culture link, key indexes such as germination rates and growth differences of different grades of seeds can be conveniently counted, a seedling culture strategy is optimized, and the screening efficiency is improved. And the standardized requirement of precision agriculture on seed quality management is met.

Description

Technical Field

[0001] The invention relates to the technical field of Phellodendron amurense seedling cultivation, in particular to a Phellodendron amurense seedling cultivation seed screening device and a screening method. Background Art

[0002] Phellodendron amurense, also known as Huangbo, is a deciduous tree belonging to the genus Phellodendron in the Rutaceae family. Its bark is used as a medicinal herb, known for its heat-clearing, detoxifying, dampness-relieving, and dysentery-relieving properties. It is widely used in Traditional Chinese Medicine (TCM). In recent years, with the increasing demand for traditional Chinese medicine, the cultivation of Phellodendron amurense has gradually attracted attention.

[0003] The yield per mu of Phellodendron amurense is affected by many factors, such as planting techniques, management level, and climatic conditions. Generally, if planted and managed properly, the yield per mu of Phellodendron amurense can reach 300-500 kilograms. To achieve higher yields and income, the quality of Phellodendron amurense seedlings must be optimized. When growing Phellodendron amurense seedlings, choose plump, pest-free, and mold-free seeds. After drying in the sun, soak the seeds to increase the germination rate. Then, in the appropriate season, choose fertile, well-drained soil for sowing. Keep the soil moist, weed and loosen the soil regularly, and transplant the seedlings when they reach a certain height.

[0004] In the existing technology, the seed screening method of Phellodendron amurense has developed from early manual visual screening to mechanical screening. The most common mechanical screening methods are air flotation, water flotation and filter screen. Although mechanical screening reduces the labor intensity compared to manual screening, the most common mechanical screening methods on the market can only perform coarse screening based on seed size, weight or density, and cannot accurately identify quality defects such as seed fullness, insect infestation or mold infection. For example, insect-infested seeds may be mixed with qualified products because their weight is close to that of healthy seeds, and moldy seeds cannot be screened out because their volume is not destroyed. In addition, the screening process does not record the seed sorting grade data, which cannot provide quality traceability and optimization basis for subsequent seedling management, making it difficult to achieve the requirements of precision agriculture. In summary, it is necessary to optimize and improve the Phellodendron amurense seedling seed screening device and screening method to solve the above problems. Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present invention provides a Phellodendron amurense seedling screening device and screening method, which solves the problems of imperfect screening mechanism and lack of record of screening process in the prior art Phellodendron amurense seedling screening device.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a Cortex Phellodendri seedling screening device, comprising a screening box, a computer, a negative pressure pump, a vibrating plate and a driving motor, wherein the lower wall of the screening box is fixedly connected to a plurality of groups of base feet for support, the screening box is composed of a first box body, a second box body and a third box body connected in sequence from left to right, the inner side wall of the first box body and the inner side wall of the third box body are fixedly connected to a feeding rack, the inner sides of the two groups of the feeding racks are rotatably connected to feeding wheels, the outer walls of the two groups of the feeding wheels are jointly sheathed with a feeding belt, the feeding belt is made of a thin transparent material and passes through the first box body, the second box body and the third box body, A seed transmission path is provided at the front and rear center position of the surface of the feeding belt, and the width of the seed transmission path is two to three times the width of the seed. A guide baffle is provided on the upper end of the left group of the two groups of feeding racks for guiding the seeds to move to the seed transmission path. Four groups of industrial cameras are provided on the inner wall of the second box body. The four groups of industrial cameras are fixedly connected to the inner upper wall and the inner lower wall of the second box body in pairs through a group of fixing frames. A sorting mechanism for adsorption and sorting according to seed grade is provided inside the third box body. The computer is used to control the industrial camera to perform image acquisition, grade judgment and sorting actions of the sorting mechanism.

[0007] Preferably, the inner lower wall of the second box body is fixedly connected to the first base frame, and the inner upper wall, inner front wall, inner rear wall and upper wall of the first base frame of the second box body are fixedly connected to fill lights. The illumination direction of the four groups of fill lights is focused on the seed transmission path of the feed belt. The light-emitting end of each group of fill lights is rotatably connected to a filter, and the filter is driven to rotate by a motor. The rotation angle of the filter is controlled by a computer to adjust the spectral wavelength.

[0008] Preferably, the installation angle of the industrial camera satisfies the complementary field of view angles of the front upper camera and the rear lower camera to cover the top and bottom of the seed, and the complementary field of view angles of the front lower camera and the rear upper camera to cover the left and right sides of the seed; each frame image captured by the industrial camera contains the seed position code, and the computer matches multi-angle images through coding to synthesize three-dimensional features.

[0009] Preferably, the sorting mechanism includes four groups of aggregate tanks, the front wall of the third box body is fixedly connected to an upper support plate near the upper side, the lower wall of the upper support plate is distributed on the left and right and fixedly connected to four groups of connecting seats in sequence, the four groups of aggregate tanks are respectively threadedly connected to the lower wall of one group of connecting seats, the upper end of the connecting seat passes through the upper support plate and extends to the upper side of the upper support plate, the upper end of the connecting seat and the center position are fixedly connected to a negative pressure sensor, the upper end of the connecting seat is connected to the negative pressure pump through a first negative pressure pipe, and the upper end of the connecting seat is connected to the upper end of the third box body through two groups of second negative pressure pipes. The third box body is connected to the wall, one end of the second negative pressure tube away from the connecting seat passes through the upper wall of the third box body and extends into the interior of the third box body, the one end of the second negative pressure tube extending into the interior of the third box body is fixedly connected to a suction pipe, and the suction pipe is fixedly connected to the lower wall of the third box body through the second base frame, and the one end of the suction pipe away from the second negative pressure tube is fixedly connected to a suction head, and the one end of the suction head away from the suction pipe extends to the upper surface of the feeding belt, and the adsorption area of ​​the suction head is aligned with the seed transmission path up and down, and each group of the collecting tanks corresponds to two groups of suction heads to form a double adsorption channel.

[0010] Preferably, the outer walls of the second negative pressure tube and the first negative pressure tube are both fixedly connected with solenoid valves.

[0011] Preferably, a group of grading labels are fixedly connected to the front wall of each group of aggregate tanks, and the grading labels include premium grade, excellent grade, good grade and qualified grade.

[0012] Preferably, the inner wall of the connecting seat is rotatably connected to a valve plate through a rotating shaft, the outer wall of the valve plate is covered with a sealing ring, the front end of the rotating shaft passes through the front wall of the connecting seat and fixes the first wrench, and the valve plate is rotated to be parallel or perpendicular to the horizontal plane by pulling the first wrench to achieve sealing or opening of the connecting seat.

[0013] Preferably, a lower support plate is fixedly connected to the front wall of the third box body near the lower side, and four groups of support plates are provided on the upper wall of the lower support plate. The four groups of support plates are respectively opposite to a group of aggregate tanks above and below. A screw is fixedly connected to the lower wall of the support plate, and the lower end of the screw passes through the inner wall of the lower support plate and is threadedly connected thereto. The screw passes through the end portion of the lower side of the lower support plate and is rotatably connected to a second wrench.

[0014] Preferably, the left side of the two groups of feeding wheels is driven to rotate by a driving motor.

[0015] The screening method of the Phellodendron amurense seedling screening device is as follows: S1. Model establishment: Manual screening of seed samples containing insect holes, shriveling, mildew, and color differences. Four sets of industrial cameras simultaneously capture images of the upper front, lower front, lower back, and upper back. A computer extracts the surface texture, shape, and light transmittance characteristics of the seeds, and a convolutional neural network is trained to generate a five-class classification model. The five classes are: excellent, good, qualified, and unqualified. S2, seed conveying: The seeds are evenly spaced and delivered to the left end of the feed belt through the vibrating plate and kept in the center. The drive motor drives the seeds to move right at a constant speed, and the guide block restricts the seeds from moving along the conveying path. S3, Image Acquisition and Processing: When the seeds enter the second box, four sets of industrial cameras simultaneously capture multi-angle images. The computer extracts features and compares them with the model to determine the seed grade. The computer generates sorting instructions based on the determination results and records the seed position code. S4. Sorting is performed. After the seeds enter the third box, the computer controls the corresponding solenoid valve to open, and the seeds are adsorbed to the designated collection tank by the suction head of the dual adsorption channel. If the first adsorption fails, the same group of suction heads will adsorb the seeds again to ensure the success rate of sorting. Unqualified seeds move to the right along the feeding belt and are sent out from the right side of the third box. S5. Aggregate tank replacement: When the aggregate tank is fully loaded, pull the first wrench to close the valve plate, rotate and remove the aggregate tank, place an empty aggregate tank on the support plate, and drive the screw upward by rotating the second wrench to make the aggregate tank on the support plate rise to align with the lower end of the connecting seat. After alignment, rotate the aggregate tank to complete the threaded connection with the connecting seat. After fixing is completed, reset the support plate and further reset the valve plate.

[0016] The present invention provides a device and method for screening seeds for Phellodendron amurense seedlings. The device and method have the following beneficial effects: Compared with the existing technology, the Cortex Phellodendri seed screening device combines multi-angle visual detection with intelligent algorithms to comprehensively judge the surface texture and three-dimensional morphology of seeds. It can effectively identify defects such as insect holes, local mildew, local shrinkage, and color abnormalities that cannot be detected by traditional mechanical screening, avoid the problem of missed detection caused by relying solely on weight or size screening, and significantly improve the screening accuracy of high-quality seeds.

[0017] Compared with the existing technology, the Cortex Phellodendri seedling screening device records the quality grade data of each seed based on an automated sorting process, providing traceable screening results for subsequent seedling cultivation, facilitating the statistics of key indicators such as germination rate and growth differences of seeds of different grades, optimizing seedling cultivation strategies, and meeting the standardized requirements of precision agriculture for seed quality management. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 A partial enlarged view of point A in the middle; Figure 3 For the present invention Figure 1 A partial enlarged view of point B in the middle; Figure 4 It is a partial side cross-sectional view of the internal structure of the second box body of the present invention; Figure 5 This is a partial cross-sectional view of the internal structure of the third box body of the present invention; Figure 6 For the present invention Figure 5 A partial enlarged view of point C in the middle; Figure 7 This is a side view of the connection structure of the suction pipe and the suction head of the present invention; Figure 8 A partial side cross-sectional view of the internal structure of the connecting seat of the present invention; Figure 9 It is a partial side sectional view of the third box body, lower support plate and support plate connection structure of the present invention.

[0019] Among them, 1. screening box; 101. first box body; 102. second box body; 103. third box body; 2. base; 3. feed rack; 4. feed wheel; 5. feed belt; 6. drive motor; 7. lower support plate; 8. upper support plate; 9. connecting seat; 10. collecting tank; 11. first wrench; 12. negative pressure sensor; 13. first negative pressure pipe; 14. second negative pressure pipe; 15. solenoid valve; 16. grading label; 17. first base frame; 18. fill light; 19. filter; 20. fixing frame; 21. industrial camera; 22. second base frame; 23. suction pipe; 24. suction head; 25. valve plate; 26. sealing ring; 27. screw; 28. second wrench; 29. ​​support plate. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example: like Figures 1 to 9 As shown, an embodiment of the present invention provides a Cortex Phellodendri seedling screening device, comprising a screening box 1, a computer, a negative pressure pump, a vibrating plate, and a drive motor 6. The lower wall of the screening box 1 is fixedly connected to a plurality of sets of supporting feet 2. The screening box 1 is composed of a first box body 101, a second box body 102, and a third box body 103 connected in sequence from left to right. In order to achieve directional transmission of seeds and prevent deviation, the inner wall of the first box body 101 and the inner wall of the third box body 103 are fixedly connected with a feeding rack 3, and the inner sides of the two groups of feeding racks 3 are rotatably connected with feeding wheels 4. The outer walls of the two groups of feeding wheels 4 are jointly sleeved with a feeding belt 5. The left group of the two groups of feeding wheels 4 is driven to rotate by a driving motor 6. The feeding belt 5 is made of a thin transparent material and passes through the first box body 101, the second box body 102 and the third box body 103. A seed transmission path is provided at the front and back center position of the surface of the feeding belt 5. The width of the seed transmission path is two to three times the width of the seed. A guide baffle for guiding the seeds to move to the seed transmission path is provided on the upper end of the left group of the two groups of feeding racks 3; The seeds move at a constant speed along a fixed path on the feeding belt 5 to avoid deviation due to vibration or inertia, ensuring that the seeds are always located in the center of the field of view when the subsequent industrial camera 21 captures images, thus solving the problem of missed detection caused by seed position deviation in traditional mechanical screening; In order to accurately identify surface defects and fullness of seeds, four groups of industrial cameras 21 are installed on the inner wall of the second box 102. The four groups of industrial cameras 21 are fixedly connected to the upper inner wall and the lower inner wall of the second box 102 in pairs through a group of fixing brackets 20. The installation angles of the industrial cameras 21 meet the complementary field of view of the front upper camera and the rear lower camera to cover the top and bottom of the seeds, and the field of view of the front lower camera and the rear upper camera to cover the left and right sides of the seeds. Each frame of image captured by the industrial camera 21 contains the seed position code, and the computer uses the code to match the multi-angle images to synthesize three-dimensional features. The feed belt 5 is made of polyester film with a light transmittance of ≥90% and a thickness of ≤0.5mm. The surface is matte-finished to reduce reflection interference. Four sets of industrial cameras 21 form multi-angle complementary imaging to fully capture the surface texture and three-dimensional morphology of the seeds. This solves the problem of traditional screening that relies on only a single perspective and causes missed detection of insect damage, mildew, and shriveling, improves the accuracy of defect recognition, and can also identify seed color differences. In order to efficiently sort by seed grade and avoid leakage, a sorting mechanism for adsorption sorting by seed grade is provided inside the third box 103. The computer is used to control the industrial camera 21 to perform image acquisition, grade judgment and sorting actions of the sorting mechanism. The sorting mechanism includes four groups of aggregate tanks 10. The front wall of the third box 103 and near the upper side are fixedly connected to the upper support plate 8. The lower wall of the upper support plate 8 is distributed on the left and right and fixedly connected to four groups of connecting seats 9 in sequence. The four groups of aggregate tanks 10 are respectively threadedly connected to the lower wall of a group of connecting seats 9. The upper end of the connecting seat 9 passes through the upper support plate 8 and extends to the upper side of the upper support plate 8. A negative pressure sensor 12 is fixedly connected to the upper end and center position of the connecting seat 9. The upper end of the connecting seat 9 is connected to the negative pressure pump through the first negative pressure pipe 13. The upper end of the connecting seat 9 is connected to the negative pressure pump through two groups The second negative pressure pipe 14 is connected to the upper wall of the third box body 103, and the end of the second negative pressure pipe 14 away from the connecting seat 9 passes through the upper wall of the third box body 103 and extends into the interior of the third box body 103. The end of the second negative pressure pipe 14 extending into the interior of the third box body 103 is fixedly connected to the suction pipe 23, and the suction pipe 23 is fixedly connected to the lower wall of the third box body 103 through the second base frame 22. The end of the suction pipe 23 away from the second negative pressure pipe 14 is fixedly connected to the suction head 24, and the end of the suction head 24 away from the suction pipe 23 extends to the upper surface of the feeding belt 5. The adsorption area of ​​the suction head 24 is aligned with the seed transmission path up and down. Each group of collecting tanks 10 corresponds to two groups of suction heads 24 to form a double adsorption channel. The outer walls of the second negative pressure pipe 14 and the first negative pressure pipe 13 are fixedly connected to the solenoid valve 15; After the computer determines the seed grade, the corresponding solenoid valve 15 opens, and the dual suction heads 24 simultaneously absorb the target seeds. If the first suction fails (due to airflow disturbance or abnormal seed posture), the second set of suction heads 24 will absorb again. This structure greatly improves the sorting success rate and avoids the problem of missed suction in single-channel suction. In order to achieve seed quality traceability and grading management, a set of grading labels 16 are fixedly connected to the front wall of each set of aggregate tanks 10. The grading labels 16 include the following content: superb grade, excellent grade, good grade and qualified grade; Operators can quickly obtain seed batch information by scanning the grading label 16, providing data support for germination rate statistics and growth difference analysis in the subsequent seedling raising process, solving the problem of lack of quality traceability in traditional screening; In order to achieve rapid replacement of the aggregate tank 10 when it is fully loaded, the inner wall of the connecting seat 9 is rotatably connected to the valve plate 25 through a rotating shaft, and the outer wall of the valve plate 25 is covered with a sealing ring 26. The front end of the rotating shaft passes through the front wall of the connecting seat 9 and fixes the first wrench 11. The valve plate 25 is rotated to be parallel or vertical to the horizontal plane by pulling the first wrench 11 to achieve the sealing or opening of the connecting seat 9. The front wall of the third box body 103 is fixedly connected to the lower support plate 7 near the lower side. Four groups of supporting plates 29 are provided on the upper wall of the lower support plate 7. The four groups of supporting plates 29 are respectively opposite to a group of aggregate tanks 10. The lower wall of the supporting plate 29 is fixedly connected to a screw 27. The lower end of the screw 27 passes through the inner wall of the lower support plate 7 and is threadedly connected thereto. The screw 27 passes through the end portion of the lower side of the lower support plate 7 and is rotatably connected to the second wrench 28. When the aggregate tank 10 needs to be replaced: the operator pulls the first wrench 11 to close the valve plate 25, rotates and removes the aggregate tank 10, and aligns the new tank with the support plate 29 on the lower support plate 7. This structure prevents seeds from being scattered due to negative pressure leakage during replacement, ensuring the continuous operation of the sorting process; In order to adapt to different ambient light conditions and enhance defect characteristics, the inner lower wall of the second box body 102 is fixedly connected to the first base frame 17. The inner upper wall, inner front wall, inner rear wall of the second box body 102 and the upper wall of the first base frame 17 are all fixedly connected to fill lights 18. The illumination direction of the four groups of fill lights 18 is focused on the seed transmission path of the feeding belt 5. The light-emitting end of each group of fill lights 18 is rotatably connected to a filter 19. The filter 19 is driven to rotate by a motor. The rotation angle of the filter 19 is controlled by a computer to adjust the spectral wavelength. Dynamically adjusting the fill light spectrum can enhance the image features of the defective area and avoid misjudgment caused by reflections or shadows of fixed light sources.

[0022] The embodiment of the present invention also provides a screening method of the Phellodendron amurense seedling screening device, and the screening is performed using the Phellodendron amurense seedling screening device. The screening method is as follows: S1. Model establishment: Manually screen seed samples containing insect holes, shriveling, mold spots, and color differences. Four sets of industrial cameras 21 simultaneously capture the upper front, lower front, lower back, and upper back images. A computer extracts the surface texture, shape, and light transmittance characteristics of the seeds, and generates a five-level classification model through convolutional neural network training. The five levels are respectively excellent, excellent, good, qualified, and unqualified. S2, seed delivery: The seeds are evenly spaced and delivered to the left end of the feeding belt 5 by the vibrating plate, and kept in the middle position. The driving motor 6 drives the seeds to move right at a constant speed, and the guide block constrains the seeds to move along the transmission path; S3. Image acquisition and processing: When the seeds enter the second box 102, four sets of industrial cameras 21 synchronously capture multi-angle images. The computer extracts features and compares them with the model to determine the seed grade. The computer generates sorting instructions based on the determination results and records the seed position code. S4. Sorting is performed. After the seeds enter the third box 103, the computer controls the corresponding solenoid valve 15 to open, and the seeds are adsorbed to the designated collection tank 10 by the suction head 24 of the dual adsorption channel. If the first adsorption fails, the second suction head 24 of the same group adsorbs the seeds again to ensure the success rate of sorting. Unqualified seeds move right along the feeding belt 5 and are sent out from the right side of the third box 103. S5. Replacement of aggregate tank 10. When aggregate tank 10 is fully loaded, pull the first wrench 11 to close valve plate 25, rotate to remove aggregate tank 10, place empty aggregate tank 10 on support plate 29, and drive screw 27 upward by rotating the second wrench 28 to make aggregate tank 10 on support plate 29 rise to align with the lower end of connecting seat 9. After alignment, rotate aggregate tank 10 to complete threaded connection with connecting seat 9. After fixing is completed, reset support plate 29 and further reset valve plate 25.

[0023] Working principle: The seeds move at a constant speed along a fixed path on the feeding belt 5 to avoid deviation due to vibration or inertia, ensuring that the seeds are always located in the center of the field of view when the subsequent industrial camera 21 collects images, solving the problem of missed detection caused by seed position deviation in traditional mechanical screening; the feeding belt 5 uses a polyester film with a transmittance of ≥90% and a thickness of ≤0.5mm, and the surface is matte treated to reduce reflection interference. The four groups of industrial cameras 21 form multi-angle complementary imaging to fully capture the surface texture and three-dimensional shape of the seeds, solving the problem of missed detection of insect infestation, mildew and shriveling caused by traditional screening relying on only a single perspective, improving the accuracy of defect recognition, and also identifying seed color difference. When the computer determines the seed grade: the corresponding solenoid valve 15 is opened, and the double suction heads 24 simultaneously adsorb the target seeds. If the first adsorption If the seed fails (due to air flow disturbance or abnormal seed posture), the second set of suction heads 24 will adsorb again. This structure will greatly improve the sorting success rate and avoid the problem of single-channel adsorption that is prone to leakage. The operator can quickly obtain seed batch information by scanning the grading label 16, providing data support for the germination rate statistics and growth difference analysis in the subsequent seedling raising stage, and solving the problem of lack of quality traceability in traditional screening. When the aggregate tank 10 needs to be replaced: the operator pulls the first wrench 11 to close the valve plate 25, and after rotating and removing the aggregate tank 10, the new tank is aligned and installed through the support plate 29 on the lower support plate 7. This structure avoids seeds from being scattered due to negative pressure leakage during replacement, ensuring the continuous operation of the sorting process. Dynamic adjustment of the fill light spectrum can enhance the image features of the defective area and avoid misjudgment caused by reflection or shadow of the fixed light source.

[0024] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for screening Phellodendron chinense seedlings, characterized by: The invention comprises a screening box (1), a computer, a negative pressure pump, a vibration plate and a driving motor (6), wherein the lower wall of the screening box (1) is fixedly connected with a plurality of base feet (2) for support, and the screening box (1) is composed of a first box body (101), a second box body (102) and a third box body (103) connected in sequence from left to right, wherein the inner wall of the first box body (101) and the inner wall of the third box body (103) are fixedly connected with a feeding rack (3), the inner sides of the two groups of the feeding racks (3) are rotatably connected with a feeding wheel (4), and the outer walls of the two groups of the feeding wheels (4) are jointly sleeved with a feeding belt (5), and the feeding belt (5) is made of a thin transparent material and passes through the interior of the first box body (101), the second box body (102) and the third box body (103), and the feeding belt (5) is provided on the outer wall of the two groups of the feeding wheels (4). A seed transmission path is provided at the front and rear center position of the surface of the material belt (5), and the width of the seed transmission path is two to three times the width of the seed. A guide baffle is provided on the upper end of the left side group of the two groups of feeding racks (3) for guiding the seeds to move to the seed transmission path. Four groups of industrial cameras (21) are provided on the inner wall of the second box (102). The four groups of industrial cameras (21) are fixedly connected to the inner upper wall of the second box (102) and the inner lower wall of the second box (102) in pairs through a group of fixing frames (20). A sorting mechanism for adsorption and sorting according to seed grade is provided inside the third box (103). The computer is used to control the industrial cameras (21) to perform image acquisition, grade determination and sorting actions of the sorting mechanism.

2. The Cortex Phellodendri seedling screening device according to claim 1, characterized in that: The inner lower wall of the second box body (102) is fixedly connected to the first base frame (17), and the inner upper wall, the inner front wall, the inner rear wall of the second box body (102) and the upper wall of the first base frame (17) are fixedly connected to fill-in lights (18). The irradiation direction of the four groups of fill-in lights (18) is focused on the seed transmission path of the feeding belt (5). The light-emitting end of each group of the fill-in lights (18) is rotatably connected to a filter (19). The filter (19) is driven to rotate by a motor, and the rotation angle of the filter (19) is controlled by a computer to adjust the spectral wavelength.

3. The Cortex Phellodendri seedling screening device according to claim 2, characterized in that: The installation angle of the industrial camera (21) satisfies the complementary field angles of the front upper camera and the rear lower camera to cover the top and bottom of the seed, and the complementary field angles of the front lower camera and the rear upper camera to cover the left and right sides of the seed; each frame of image captured by the industrial camera (21) contains a seed position code, and the computer matches multi-angle images through the code to synthesize three-dimensional features.

4. The Cortex Phellodendri seedling screening device according to claim 3, characterized in that: The sorting mechanism comprises four groups of aggregate tanks (10), the front wall of the third box body (103) and the upper side thereof are fixedly connected with an upper support plate (8), the lower wall of the upper support plate (8) is distributed on the left and right sides and fixedly connected with four groups of connecting seats (9) in sequence, the four groups of aggregate tanks (10) are respectively threadedly connected to the lower wall of one group of connecting seats (9), the upper end of the connecting seat (9) passes through the upper support plate (8) and extends to the upper side of the upper support plate (8), the upper end of the connecting seat (9) and the center thereof are fixedly connected with a negative pressure sensor (12), the upper end of the connecting seat (9) is connected to the negative pressure pump through a first negative pressure pipe (13), the upper end of the connecting seat (9) is connected to the upper wall of the third box body (103) through two groups of second negative pressure pipes (14), the second negative pressure pipes (15) and the upper end of the connecting seat (9) are connected to the upper wall of the third box body (10 ... One end of the second negative pressure pipe (14) away from the connecting seat (9) passes through the upper wall of the third box (103) and extends into the interior of the third box (103); one end of the second negative pressure pipe (14) extending into the interior of the third box (103) is fixedly connected to a suction pipe (23); the suction pipe (23) is fixedly connected to the lower wall of the third box (103) through the second base frame (22); one end of the suction pipe (23) away from the second negative pressure pipe (14) is fixedly connected to a suction head (24); one end of the suction head (24) away from the suction pipe (23) extends to the upper surface of the feeding belt (5); the adsorption area of ​​the suction head (24) is aligned with the seed transmission path up and down, and each group of the collecting tanks (10) corresponds to two groups of suction heads (24) to form a double adsorption channel.

5. The Cortex Phellodendri seedling screening device according to claim 4, characterized in that: The outer walls of the second negative pressure tube (14) and the first negative pressure tube (13) are both fixedly connected with electromagnetic valves (15).

6. The Cortex Phellodendri seedling screening device according to claim 5, characterized in that: A group of grading labels (16) are fixedly connected to the front wall of each group of aggregate tanks (10), and the grading labels (16) include the following contents: superb grade, excellent grade, good grade and qualified grade.

7. The Cortex Phellodendri seedling screening device according to claim 6, characterized in that: The inner wall of the connecting seat (9) is rotatably connected to a valve plate (25) via a rotating shaft, and the outer wall of the valve plate (25) is covered with a sealing ring (26). The front end of the rotating shaft passes through the front wall of the connecting seat (9) and fixes the first wrench (11). The valve plate (25) is rotated to be parallel or vertical to the horizontal plane by pulling the first wrench (11) to achieve the sealing or opening of the connecting seat (9).

8. The Cortex Phellodendri seedling screening device according to claim 7, characterized in that: A lower support plate (7) is fixedly connected to the front wall of the third box body (103) and near the lower side. Four groups of supporting plates (29) are provided on the upper wall of the lower support plate (7). The four groups of supporting plates (29) are respectively opposite to a group of aggregate tanks (10) in upper and lower positions. A screw rod (27) is fixedly connected to the lower wall of the supporting plate (29). The lower end of the screw rod (27) passes through the inner wall of the lower support plate (7) and is threadedly connected thereto. The screw rod (27) passes through the end portion of the lower side of the lower support plate (7) and is rotatably connected to a second wrench (28).

9. The Cortex Phellodendri seedling screening device according to claim 8, characterized in that: Of the two groups of feeding wheels (4), the group on the left side is driven to rotate by a driving motor (6).

10. The screening method of the Cortex Phellodendri seedling screening device according to claim 9, characterized in that: The screening method is as follows: S1. Model establishment: Manually screen seed samples with insect holes, shriveling, mildew spots, and color difference, and use four sets of industrial cameras (21) to synchronously capture the front upper, front lower, back lower, and back upper images; the computer extracts the seed surface texture, shape, and transmittance characteristics, and generates a five-level classification model through convolutional neural network training. The five levels are respectively excellent, excellent, good, qualified, and unqualified. S2, seed transport, the seeds are evenly spaced and sent to the left end of the feeding belt (5) through the vibrating plate, and kept in the middle position, and the seeds are driven by the driving motor (6) to move to the right at a uniform speed, and the guide block constrains the seeds to move along the transmission path; S3, image acquisition and processing, when the seeds enter the second box (102), four sets of industrial cameras (21) synchronously capture multi-angle images, and the computer extracts features and compares them with the model to determine the seed grade; the computer generates a sorting instruction based on the determination result and records the seed position code; S4, sorting execution, after the seeds enter the third box (103), the computer controls the corresponding electromagnetic valve (15) to open, and the seeds are adsorbed to the designated collection tank (10) through the suction head (24) of the double adsorption channel; if the first adsorption fails, the same group of suction heads (24) adsorb again to ensure the success rate of sorting, and the unqualified seeds are moved to the right along the feeding belt (5) and sent out from the right side of the third box (103); S5. Replacement of the aggregate tank (10). When the aggregate tank (10) is fully loaded, pull the first wrench (11) to close the valve plate (25), rotate and remove the aggregate tank (10), place an empty aggregate tank (10) on the support plate (29), and drive the screw (27) to rise by rotating the second wrench (28), so that the aggregate tank (10) on the support plate (29) rises to align with the lower end of the connecting seat (9). After alignment, the aggregate tank (10) is rotated to complete the threaded connection with the connecting seat (9). After the fixing is completed, the support plate (29) is reset, and the valve plate (25) is further reset.

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