A grain appearance detection device and method based on visual detection

Abstract

The application discloses a kind of grain appearance detection device and method based on visual inspection, it is related to visual inspection technical field, including detection box, the one side of the detection box is provided with grain conveying device, the upper end of the detection box middle part is provided with auxiliary adjustment mechanism, the outer surface of the auxiliary adjustment mechanism is provided with screening mechanism for placing seed to detect.The resistivity detection mechanism in the application realizes the evaluation and automatic classification of grain quality, the grain is wetted by spraying and removes surface moisture before entering the detection process, so that the seed is in uniform wet state, improve the accuracy of resistivity detection, reduce the error caused by dryness, then the resistivity detection mechanism cooperates with auxiliary adjustment mechanism using non-destructive testing method, can evaluate its health condition without damaging the seed, and according to the difference of resistivity, preliminary classification of the grain is carried out according to the size and the size.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, and in particular to a device and method for inspecting the appearance of grains based on visual inspection. Background Technology

[0002] For example, the invention with publication number CN107328681A, entitled "A Machine Vision-Based System for Detecting Thousand-Grain Weight and Moisture Content of Grains and Legumes," is accurate, reliable, simple in structure, and highly versatile. It reduces seed adhesion and stacking, simplifies post-processing image processing, and enables the detection of thousand-grain weight and moisture content.

[0003] In the process of grain inspection, if there are problems such as cavities, defects or size differences inside the grain, and it enters the visual inspection stage directly without preliminary screening, it will lead to a decrease in image recognition accuracy and affect the overall inspection effect. In addition, if the same visual inspection mechanism is used for high-quality seeds and low-quality seeds after grading, targeted and accurate inspection cannot be achieved, reducing the applicability and accuracy of visual inspection. Therefore, this application provides a grain appearance inspection device and method based on visual inspection to meet the needs. Summary of the Invention

[0004] The purpose of this application is to provide a visual inspection device and method for grain appearance inspection, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a grain appearance inspection device based on visual inspection, comprising an inspection box, a grain conveying device on one side of the inspection box, an auxiliary adjustment mechanism in the upper middle of the inspection box, a screening mechanism for placing seeds for inspection on the outer surface of the auxiliary adjustment mechanism, a resistivity detection mechanism for grading the seeds inside the screening mechanism in conjunction with the auxiliary adjustment mechanism in the upper side of the inspection box, a grading visual inspection mechanism for using different visual inspection methods on different grades of seeds inside the screening mechanism in the upper side of the inspection box, an inspection camera in the upper side of the inspection box, a grain position adjustment mechanism in common at the upper end of the auxiliary adjustment mechanism and the lower part of the grading visual inspection mechanism, the grain position adjustment mechanism for adjusting the position of the seeds inside the screening mechanism so as to assist the inspection camera in inspection, the grain position adjustment mechanism being located between the grading visual inspection mechanism and the inspection camera, and multiple grain boxes in the upper side of the inspection box, with air jets in the upper part of the grain boxes;

[0006] The resistivity detection mechanism includes an electric contact piece, which is shaped like the symbol "Ω" and has a spring inside.

[0007] The resistivity detection mechanism further includes a support base, which is installed at the upper end of the detection box. A support rod is provided at the bottom of the support base, and collars are provided on both sides of the contact piece, with the collars sleeved on the outer surface of the support rod.

[0008] The auxiliary adjustment mechanism includes a support cylinder and a central support assembly installed on the upper end of the detection box. The upper end of the support cylinder is provided with a ring, and the upper end of the ring is provided with a plastic ring and a metal gasket. The upper end of the central support assembly is provided with an air jet pipe, and the interior of the central support assembly is provided with a drive motor.

[0009] The screening mechanism includes a mounting plate, which is rotatably mounted on the outer surface of the central support component via bearings and gears. The upper end of the mounting plate is provided with several grain placement boxes arranged in a circular array. The grain placement boxes have superior seed troughs and inferior seed troughs inside. A connecting pipe is provided on one side of the grain placement box, which communicates with the inside of the superior seed trough.

[0010] The grain placement box has a dividing groove at the top center, a guide groove at the bottom, and a bottom hole at the bottom wall of the seed trough.

[0011] The grain position adjustment mechanism includes a support frame and a cover plate. The support frame is installed on the upper end of the central support assembly, and a vent pipe is provided at the lower end of the support frame. The vent pipe is located on both sides of the lower part of the detection camera.

[0012] The cover has a hole and two vent holes at its upper end, which are connected to the inside of the vent pipe. The bottom of the cover has a support rib, and the length of the support rib is two-thirds of the length of the cover. The support rib is located inside the partition groove.

[0013] The graded visual inspection mechanism includes a camera frame, which is installed on the upper part of the inspection box. A reflective cover is provided at the bottom of the camera frame, and a reflective sleeve is provided at the bottom of the reflective cover. A partition is provided in the middle of the inner wall of the reflective cover and the reflective sleeve. A color-correcting lamp is provided on the inner wall of the reflective cover and on one side of the partition. A color-correcting cone is provided on the inner wall of the reflective sleeve and at the bottom of the color-correcting lamp.

[0014] The inner wall of the reflective sleeve is provided with a supplementary light and a supplementary light plate. Two reflective sheets are symmetrically arranged at the bottom of the reflective sleeve. The bottom of the two reflective sheets is provided with a mounting cylinder, which is installed inside the hole.

[0015] This invention also provides a method for detecting the appearance of grains, the specific detection method of which is as follows:

[0016] S1. After the grains are sprayed and moistened to remove surface moisture, they are fed into the grain conveying device. The grain conveying device pushes the grains to the screening mechanism, while the drive motor inside the auxiliary adjustment mechanism drives the screening mechanism to rotate slowly through the transmission component. When the screening mechanism rotates the grains to the underside of the resistivity detection mechanism, the resistivity detection mechanism works with the auxiliary adjustment mechanism to detect the resistivity of the grain particles.

[0017] S2. After the resistivity of the grain is detected by the resistivity detection mechanism, the seeds are pre-selected and graded according to their different resistivities. The auxiliary adjustment mechanism changes the position of the seeds inside the screening mechanism by air jet, thereby achieving the grading process of the seeds.

[0018] S3. The graded seeds will be moved to the bottom of the grading visual inspection mechanism. The grading visual inspection mechanism is equipped with two different types of visual inspection devices. One type is used to inspect the surface mold and color of the high-quality seeds after grading in the screening mechanism. The other type is used to inspect the seeds for defects after grading in the screening mechanism. When the seeds after inspection by the grading visual inspection mechanism are moved to the bottom of the inspection camera, the grain position adjustment mechanism changes the placement of the seeds in the screening mechanism. By moving the seed storage position, the inspection camera can perform a comprehensive inspection of the seeds.

[0019] In summary, the technical effects and advantages of this invention are as follows:

[0020] 1. The resistivity detection mechanism in this invention realizes the assessment and automatic grading of grain quality. Before entering the detection process, the grain is sprayed and moistened to remove surface moisture, so that the seeds are in a uniformly moist state, which improves the accuracy of resistivity detection and reduces errors caused by drying. Then, the resistivity detection mechanism, together with the auxiliary adjustment mechanism, adopts a non-destructive detection method to assess its health status without damaging the seeds, and quickly achieves preliminary grading of the grain defects and size based on resistivity differences.

[0021] 2. After initial grading, the seeds of this invention enter the visual inspection stage. The grading visual inspection mechanism is equipped with two different types of inspection devices. One is used for mold and color detection of high-quality seeds, which can effectively identify seeds with surface diseases or discoloration. The other is used for defect detection of secondary seeds to determine whether they are suitable for further processing or planting. The integrity of the seeds is comprehensively evaluated from multiple perspectives, which improves the detection accuracy and classification reliability.

[0022] 3. The grain position adjustment mechanism set in this invention works in conjunction with the auxiliary detection camera to ensure comprehensive detection. The seed placement position is dynamically adjusted below the detection camera to avoid missed detections caused by obstruction or limited viewing angle, thereby achieving all-round image acquisition of each seed and significantly improving image acquisition coverage and detection consistency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first-view three-dimensional structural diagram of a vision-based grain appearance inspection device.

[0025] Figure 2 This is a second-view stereoscopic structural diagram of a vision-based grain appearance inspection device.

[0026] Figure 3 This is a third-view stereoscopic structural diagram of a vision-based grain appearance inspection device.

[0027] Figure 4 This is a schematic diagram of a local first-person perspective stereo connection structure based on visual detection.

[0028] Figure 5 A schematic diagram of a local second-view stereo connection structure based on vision detection;

[0029] Figure 6 A schematic diagram of a local third-view stereo connection structure based on visual detection;

[0030] Figure 7 A first-person perspective three-dimensional connection structure diagram for the auxiliary adjustment mechanism;

[0031] Figure 8 A schematic diagram of the second-view three-dimensional connection structure for assisting the adjustment mechanism;

[0032] Figure 9 A schematic diagram of the three-dimensional connection structure for assisting in the adjustment and screening mechanisms;

[0033] Figure 10 A first-person perspective three-dimensional connection structure diagram of the grain position adjustment mechanism;

[0034] Figure 11 A second-view three-dimensional connection structure diagram of the grain position adjustment mechanism;

[0035] Figure 12 A first-person perspective three-dimensional connection structure diagram of the screening mechanism;

[0036] Figure 13 A schematic diagram of the two-dimensional connection structure of the screening mechanism from a second perspective;

[0037] Figure 14 A schematic diagram of the partial three-dimensional connection structure of the screening mechanism;

[0038] Figure 15 A schematic diagram of the three-dimensional connection structure of the grain storage box;

[0039] Figure 16 A schematic diagram of the three-dimensional connection structure between the superior seed tank and the inferior seed tank;

[0040] Figure 17 This is a schematic diagram of the three-dimensional connection structure of the resistivity detection mechanism;

[0041] Figure 18 This is a schematic diagram of a partial three-dimensional connection structure of the resistivity detection mechanism;

[0042] Figure 19 This is a schematic diagram of the three-dimensional connection structure between the contact plate and the spring;

[0043] Figure 20 A first-view stereoscopic connection structure diagram of a graded visual inspection mechanism;

[0044] Figure 21 A schematic diagram of the second-view stereo connection structure of a graded visual inspection mechanism;

[0045] Figure 22 This is a schematic diagram of the three-dimensional connection structure between the reflector cover and the partition.

[0046] Figure 23 A schematic diagram of the three-dimensional connection structure of the reflective sleeve and reflective sheet;

[0047] Figure 24 A schematic diagram of the three-dimensional connection structure between the color mixing cone and the reflective sleeve;

[0048] Figure 25 This is a diagram showing the distribution of the toning cone and filler plate inside the reflector sleeve.

[0049] In the diagram: 1. Grain conveying device; 2. Detection box; 3. Screening mechanism; 31. Mounting plate; 32. Grain placement box; 33. Connecting pipe; 34. Guide trough; 35. Bottom hole; 36. Separating trough; 37. Inferior seed trough; 38. Superior seed trough; 4. Resistivity detection mechanism; 41. Support base; 42. Contact plate; 43. Support rod; 44. Collar; 45. Spring; 5. Grading visual inspection mechanism; 51. Camera stand; 52. Reflector cover; 53. Reflector sleeve; 54. Reflector sheet; 5 5. Mounting cylinder; 56. Partition plate; 57. Color-correcting lamp; 58. Supplemental light; 59. Supplemental light plate; 50. Color-correcting cone; 6. Grain position adjustment mechanism; 61. Support frame; 62. Cover plate; 63. Support rib; 64. Hole; 65. Vent hole; 66. Vent pipe; 7. Grain bin; 8. Air nozzle; 9. Auxiliary adjustment mechanism; 91. Support cylinder; 92. Central support assembly; 93. Air nozzle; 94. Metal gasket; 95. Plastic ring; 96. Ring; 10. Detection camera. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0051] Example 1, Reference Figures 1 to 25 The invention discloses a vision-based grain appearance inspection device and method, comprising an inspection box 2, a grain conveying device 1 on one side of the inspection box 2, an auxiliary adjustment mechanism 9 in the upper middle part of the inspection box 2, a screening mechanism 3 for placing seeds for inspection on the outer surface of the auxiliary adjustment mechanism 9, a resistivity detection mechanism 4 for grading the seeds inside the screening mechanism 3 in conjunction with the auxiliary adjustment mechanism 9 in the upper side of the inspection box 2, a grading vision inspection mechanism 5 for using different vision inspection methods on different grades of seeds inside the screening mechanism 3 in the upper side of the inspection box 2, an inspection camera 10 in the upper side of the inspection box 2, a grain position adjustment mechanism 6 in the upper part of the auxiliary adjustment mechanism 9 and the lower part of the grading vision inspection mechanism 5, the grain position adjustment mechanism 6 for adjusting the position of the seeds inside the screening mechanism 3 so as to assist the inspection camera 10 in inspection, the grain position adjustment mechanism 6 being located between the grading vision inspection mechanism 5 and the inspection camera 10, and multiple grain boxes 7 in the upper side of the inspection box 2, with an air jet 8 in the upper part of the grain box 7.

[0052] It is worth noting that after the grains are sprayed and moistened to remove surface moisture, they are fed into the grain conveying device 1. The grain conveying device 1 pushes the grains to the screening mechanism 3, while the drive motor inside the auxiliary adjustment mechanism 9 drives the screening mechanism 3 to rotate slowly through the transmission component. When the screening mechanism 3 rotates the grains to the underside of the resistivity detection mechanism 4, the resistivity detection mechanism 4 works with the auxiliary adjustment mechanism 9 to detect the resistivity of the grain particles.

[0053] After the resistivity of the grain is detected by the resistivity detection mechanism 4, the seeds are pre-selected and graded according to their different resistivities. Meanwhile, the auxiliary adjustment mechanism 9 changes the position of the seeds inside the screening mechanism 3 by air jet, thereby achieving seed grading.

[0054] Spray wetting can evenly moisten the surface of the grain, which helps to measure its resistivity more accurately. The moistened grain can conduct electricity better, thereby reducing the high resistance error caused by dryness. The resistivity detection mechanism 4 is a non-destructive detection method that can assess the health status of the seeds without damaging them. Based on the difference in resistivity, the grains can be quickly classified into different grades, providing a basis for subsequent processing. The resistivity data of each seed can be recorded in real time, which is convenient for subsequent statistical analysis and quality traceability.

[0055] The graded seeds are then moved to the area below the grading visual inspection mechanism 5. Inside the grading visual inspection mechanism 5 are two different types of visual inspection devices. One type is used to inspect the surface mold and color of the high-quality seeds graded inside the screening mechanism 3. The other type is used to inspect the seeds for defects after grading inside the screening mechanism 3. When the seeds inspected by the grading visual inspection mechanism 5 are moved to the area below the inspection camera 10, the grain position adjustment mechanism 6 changes the placement of the seeds inside the screening mechanism 3. By moving the seed storage position, the inspection camera 10 can perform a comprehensive inspection of the seeds.

[0056] Among them, the grading visual inspection agency 5 can effectively screen out seeds with surface mold and color by detecting high-quality seeds, ensuring that only healthy seeds enter the subsequent processing or planting stage. Using specially designed visual inspection equipment, it can capture subtle color changes and surface defects, providing higher detection accuracy.

[0057] For secondary seeds, the focus is on detecting whether they have cracks, damage, or other internal structural defects to determine whether they are suitable for further processing or planting. By combining various visual inspection techniques such as texture analysis and morphological manipulation, the integrity of the seeds can be comprehensively evaluated from different angles. The inspection results of each seed can be recorded and analyzed to provide a scientific basis for subsequent processing.

[0058] The grain position adjustment mechanism 6 changes the placement of the seeds, ensuring that each seed can be photographed by the detection camera from multiple angles, avoiding missed detections due to obstruction or limited viewing angle. The dynamic adjustment of the seed position allows the detection camera to fully cover all surfaces of the seeds, improving the accuracy and reliability of the detection.

[0059] Example 2: Based on the auxiliary adjustment mechanism 9, screening mechanism 3 and resistivity detection mechanism 4 proposed in Example 1, this example provides a further technical solution for the auxiliary adjustment mechanism 9, screening mechanism 3 and resistivity detection mechanism 4.

[0060] The screening mechanism 3 includes a mounting plate 31, which is rotatably mounted on the outer surface of the central support component 92 via bearings and gears. Several grain placement boxes 32 arranged in a circular array are provided at the upper end of the mounting plate 31. The grain placement boxes 32 have superior seed troughs 38 and inferior seed troughs 37 inside. A connecting pipe 33 communicating with the inside of the superior seed troughs 38 is provided on one side of the grain placement boxes 32.

[0061] The upper middle part of the grain placement box 32 is provided with a dividing groove 36, the bottom of the grain placement box 32 is provided with a guide groove 34, and the bottom wall of the seed trough 38 is provided with a bottom hole 35.

[0062] The auxiliary adjustment mechanism 9 includes a support cylinder 91 and a middle support assembly 92 installed on the upper end of the detection box 2. The upper end of the support cylinder 91 is provided with a ring 96, and the upper end of the ring 96 is provided with a plastic ring 95 and a metal gasket 94. The upper end of the middle support assembly 92 is provided with an air jet pipe 93, and the middle support assembly 92 is provided with a drive motor inside.

[0063] It is worth noting that the grain first falls into the seed trough 38 through the grain conveying device 1, and then further falls into the bottom hole 35. At this time, the drive motor inside the middle support component 92 drives the mounting plate 31 to rotate through gears and bearings. The mounting plate 31 then drives the grain placement box 32 to rotate synchronously. The guide groove 34 at the bottom of the grain placement box 32 is engaged with the surface of the ring 96 to ensure its stable operation.

[0064] During the rotation, the grains in the seed trough 38 come into contact with the plastic ring 95 through the bottom hole 35. The surface of the plastic ring 95 is provided with anti-slip stripes, which can effectively enhance the friction and make the grains change position as the grain placement box 32 rotates. This allows the grains in the seed trough 38 to adjust their posture as they rotate, which is convenient for the subsequent grading visual inspection agency 5 to perform multi-angle and all-round inspection.

[0065] The drive motor rotates the mounting plate 31 and the grain placement box 32, causing the grains in the seed trough 38 to automatically adjust their posture under the combined action of centrifugal force and friction. The bottom guide groove 34 of the grain placement box 32 is engaged with the surface of the ring 96 to ensure smooth operation during rotation. The grains change position along with the seed trough 38 during rotation, allowing the grading visual inspection mechanism 5 to perform all-round inspection of each grain from multiple angles, thereby significantly improving the inspection accuracy and recognition rate.

[0066] The resistivity detection mechanism 4 includes a contact piece 42, which is shaped like the symbol "Ω". A spring 45 is installed inside the contact piece 42. The resistivity detection mechanism 4 also includes a support base 41, which is installed on the upper end of the detection box 2. A support rod 43 is provided at the bottom of the support base 41. A collar 44 is provided on both sides of the contact piece 42, and the collar 44 is sleeved on the outer surface of the support rod 43.

[0067] When the grains move with the grain placement box 32 to the position of the metal pad 94, the set contact piece 42 is shaped like the symbol "Ω", so that the contact piece 42 can be locked inside the superior seed trough 38. When the contact piece 42 is inside the superior seed trough 38, the contact piece 42 squeezes the grains inside the superior seed trough 38. The contact piece 42 contacts the grains inside the superior seed trough 38, and the grains will also contact the metal pad 94 through the bottom hole 35. The resistivity of the grains is detected by the combination of contact piece 42 and metal pad 94. The grains are screened and graded by detecting the resistivity of different grain particles. After the grains pass the resistivity detection, the jet pipe 93 jets into the connecting pipe 33, blowing the secondary seeds inside the superior seed trough 38 into the inferior seed trough 37, while the high-quality seeds will be retained inside the superior seed trough 38. Because the resistivity of the damaged and smaller seeds is different from that of the high-quality seeds, the seeds can be pre-screened according to the different resistivities.

[0068] The rotation of the grain placement box 32 drives the grain into the detection area, realizing the orderly delivery and positioning of the seeds. The contact plate 42, in an "Ω" shape, is inserted into the superior seed trough 38, contacting and squeezing the grain to form a stable electrode contact. The metal pad 94 and the contact plate 42 together form a complete current path. Through the resistivity detection mechanism, the grain is clamped between the contact plate 42 and the metal pad 94 to form a resistance measurement circuit, thereby realizing a preliminary judgment on the seed quality. After the detection is completed, the air jet pipe 93 and the connecting pipe 33 are linked to identify inferior seeds based on the resistivity results and blow them into the inferior seed trough 37 by air jet to complete the automatic grading.

[0069] The design of the contact pad 42 effectively contacts the grain, enhancing contact stability and improving detection consistency. It also has elastic adaptability, allowing it to adapt to seeds of different sizes and avoiding poor contact due to size differences. The resistivity detection method formed by the combination of the contact pad 42 and the metal pad 94 is a non-destructive detection method that preserves seed activity. It is applicable to various grains such as wheat, corn, and rice, and has good versatility and broad application prospects. By measuring resistivity differences, it can quickly identify damaged, shriveled, or moldy seeds. These seeds usually exhibit low resistivity due to cell membrane damage or abnormal moisture content, thus providing an efficient basis for subsequent screening.

[0070] Example 3: Based on the grain position adjustment mechanism 6 and grading visual inspection mechanism 5 proposed in Example 1, this example provides a further technical solution for the grain position adjustment mechanism 6 and grading visual inspection mechanism 5.

[0071] The graded visual inspection mechanism 5 includes a camera frame 51, which is installed on the upper part of the inspection box 2. A reflector cover 52 is provided at the bottom of the camera frame 51, and a reflector sleeve 53 is provided at the bottom of the reflector cover 52. A partition 56 is provided in the middle of the inner wall of the reflector cover 52 and the reflector sleeve 53. A color-correcting lamp 57 is provided on the inner wall of the reflector cover 52 and on one side of the partition 56. A color-correcting cone 50 is provided on the inner wall of the reflector sleeve 53 and at the bottom of the color-correcting lamp 57.

[0072] The inner wall of the reflective sleeve 53 is provided with a supplementary light 58 and a supplementary light plate 59. Two reflective sheets 54 are symmetrically arranged at the bottom of the reflective sleeve 53. The bottom of the two reflective sheets 54 is provided with a mounting cylinder 55. The mounting cylinder 55 is installed inside the hole 64. The reflective sheets 54 and the mounting cylinder 55 are used to isolate the influence of external light on visual inspection. The partition 56 is used to separate the space inside the reflective cover 52 and the reflective sleeve 53 to prevent the light source from mixing and affecting the inspection effect when inspecting the seeds inside the superior seed trough 38 and inferior seed trough 37.

[0073] It is worth noting that after the grains inside the grain placement box 32 are graded and screened, the grains will move to the bottom of the mounting cylinder 55 as the grain placement box 32 moves. The grain placement boxes 32 are arranged in a circular array. The high-quality seeds inside the superior seed trough 38 are located on the inner diameter of the ring, while the seeds inside the inferior seed trough 37 are located on the outer diameter of the ring.

[0074] The seeds inside the superior seed trough 38 are moved to the bottom of the color-matching cone 50, while the supplementary color lamp 57 provides supplementary lighting according to the color of different grains. This allows the camera above the supplementary color lamp 57 to be illuminated by the supplementary light, and then the color of the light is adjusted by the color-matching cone 50 to detect mold spots and the maturity of the grains. Meanwhile, the seeds inside the inferior seed trough 37 are moved to the bottom of the supplementary light lamp 58. With the cooperation of the supplementary light lamp 58 and the supplementary light plate 59, the grains inside the inferior seed trough 37 are under strong light, and then the camera above the supplementary light plate 59 can clearly detect the defects of the grains.

[0075] Among them, the complementary light 57 adjusts the color temperature or spectral composition of the light source according to the color of the grain in the seed trough 38, and the color adjusting cone 50 further optimizes the light direction and color uniformity. Combined with the camera to capture high-quality images, it significantly enhances the ability to identify mold spots and accurately judges the maturity of seeds. It also reduces the interference of ambient light through precise light control.

[0076] For grain detection in inferior seed trough 37, a strong light is used in combination with a supplementary light plate 59 to form a uniform background light or outline light, enabling the camera to acquire a high-contrast image. This allows for efficient identification of defective seeds with irregular edges or problems such as breakage or cracks. Even inferior seeds with rough surfaces or uneven colors can obtain a clear outline image through backlighting.

[0077] The grain position adjustment mechanism 6 includes a support frame 61 and a cover plate 62. The support frame 61 is installed on the upper end of the middle support assembly 92, and a vent pipe 66 is provided at the lower end of the support frame 61. The vent pipe 66 is located on both sides of the lower part of the detection camera 10.

[0078] The upper end of the cover plate 62 is provided with a hole 64 and two exhaust holes 65. The exhaust holes 65 are connected to the inside of the ventilation pipe 66. The bottom of the cover plate 62 is provided with a support rib 63, and the length of the support rib 63 is two-thirds of the length of the cover plate 62. This design can prevent the grain from falling into the inferior seed trough 37 when the jet pipe 93 blows air into the inside of the connecting pipe 33. The support rib 63 is located inside the partition trough 36.

[0079] In this process, after the grains are inspected by the grading visual inspection mechanism 5, the rotation of the screening mechanism 3 moves the grains inspected by the grading visual inspection mechanism 5 to the area below the inspection camera 10. In order for the inspection camera 10 to detect grains at multiple angles inside the superior seed trough 38 and inferior seed trough 37, air is sprayed through the vent pipe 66 to the exhaust port 65. The cover plate 62 covers the surface of the grain placement box 32, and the supporting ribs 63 are locked inside the partition groove 36, so that the space inside the superior seed trough 38 and inferior seed trough 37 is closed, preventing the grains from being blown out of the grain placement box 32 when the exhaust port 65 blows air into the superior seed trough 38 and inferior seed trough 37. The inspection camera 10 is used to perform a final all-round inspection of the grains. After being inspected by the inspection camera 10, the grains will move to different positions in the grain box 7 as the screening mechanism 3 rotates, and then the grains will be blown into the grain box 7 through the air nozzle 8 for screening.

[0080] The ventilation pipe 66 sprays air into the exhaust port 65 to regulate the posture of the grains. Directional airflow ensures that the airflow only acts on a specific area and does not affect other parts. At the same time, the airflow operation is carried out within the closed space formed by the cover plate 62 and the support rib 63, which can effectively adjust the position of the grains and prevent them from flying out of the grain placement box 32. The detection camera 10 is used to perform a final all-round inspection of the grains after the airflow posture adjustment. Multi-angle imaging technology allows the camera to capture images from different perspectives, comprehensively identify seed surface features such as mold spots and cracks, significantly improve the detection accuracy, and the high-resolution industrial camera can acquire clear images.

[0081] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grain appearance inspection device based on visual inspection, comprising an inspection box (2), wherein a grain conveying device (1) is provided on one side of the inspection box (2), characterized in that: An auxiliary adjustment mechanism (9) is provided at the upper middle part of the detection box (2). A screening mechanism (3) for placing seeds for detection is provided on the outer surface of the auxiliary adjustment mechanism (9). A resistivity detection mechanism (4) is provided on one side of the upper end of the detection box (2) to grade the seeds inside the screening mechanism (3) in conjunction with the auxiliary adjustment mechanism (9). A grading visual detection mechanism (5) is provided on one side of the upper end of the detection box (2) to use different visual detection methods for different grades of seeds inside the screening mechanism (3). There is a detection camera (10). The upper end of the auxiliary adjustment mechanism (9) and the lower part of the grading visual detection mechanism (5) are jointly provided with a grain position adjustment mechanism (6). The grain position adjustment mechanism (6) is used to adjust the position of the seeds inside the screening mechanism (3) so as to assist the detection camera (10) in detection. The grain position adjustment mechanism (6) is located between the grading visual detection mechanism (5) and the detection camera (10). Multiple grain boxes (7) are provided on one side of the upper end of the detection box (2), and an air jet (8) is provided on the upper end of the grain box (7). The resistivity detection mechanism (4) includes a contact piece (42), which is shaped like the symbol "Ω" and has a spring (45) inside. The resistivity detection mechanism (4) also includes a support base (41), which is installed on the upper end of the detection box (2). A support rod (43) is provided at the bottom of the support base (41). A collar (44) is provided on both sides of the contact piece (42), and the collar (44) is sleeved on the outer surface of the support rod (43). The auxiliary adjustment mechanism (9) includes a support tube (91) and a middle support assembly (92) installed on the upper end of the detection box (2). The upper end of the support tube (91) is provided with a ring (96), the upper end of the ring (96) is provided with a plastic ring (95) and a metal gasket (94), the upper end of the middle support assembly (92) is provided with a jet pipe (93), and the middle support assembly (92) is provided with a drive motor inside. The grain position adjustment mechanism (6) includes a support frame (61) and a cover plate (62). The support frame (61) is installed on the upper end of the middle support assembly (92). A vent pipe (66) is provided at the lower end of the support frame (61). The vent pipe (66) is located on both sides of the lower part of the detection camera (10). The upper end of the cover plate (62) is provided with a hole (64) and two exhaust holes (65). The exhaust holes (65) are connected to the interior of the vent pipe (66). The bottom of the cover plate (62) is provided with a support rib (63), and the length of the support rib (63) is two-thirds of the length of the cover plate (62). The support rib (63) is located inside the partition groove (36). The screening mechanism (3) includes a mounting plate (31), which is rotatably mounted on the outer surface of the central support component (92) via bearings and gears. The upper end of the mounting plate (31) is provided with a number of grain placement boxes (32) arranged in a circular array. The grain placement box (32) has a superior seed trough (38) and a inferior seed trough (37) inside. A connecting pipe (33) communicating with the inside of the superior seed trough (38) is provided on one side of the grain placement box (32). The upper middle part of the grain placement box (32) is provided with a dividing groove (36), the bottom of the grain placement box (32) is provided with a guide groove (34), and the bottom wall of the superior seed trough (38) is provided with a bottom hole (35).

2. The grain appearance inspection device based on vision inspection according to claim 1, characterized in that: The graded visual inspection mechanism (5) includes a camera frame (51), which is installed on the upper end of the inspection box (2). A reflector cover (52) is provided at the bottom of the camera frame (51), and a reflector sleeve (53) is provided at the bottom of the reflector cover (52). A partition (56) is provided in the middle of the inner wall of the reflector cover (52) and the reflector sleeve (53). A color-correcting lamp (57) is provided on the inner wall of the reflector cover (52) and on one side of the partition (56). A color-correcting cone (50) is provided on the inner wall of the reflector sleeve (53) and at the bottom of the color-correcting lamp (57).

3. The grain appearance inspection device based on vision inspection according to claim 2, characterized in that: The inner wall of the reflective sleeve (53) is provided with a supplementary light (58) and a supplementary light plate (59). Two reflective sheets (54) are symmetrically arranged at the bottom of the reflective sleeve (53). The bottom of the two reflective sheets (54) is provided with a mounting cylinder (55), which is installed inside the hole (64).

4. A method for grain appearance inspection based on vision detection, employing a grain appearance inspection device based on vision detection as described in any one of claims 1-3, characterized in that, The specific testing methods are as follows: S1. After the grain is sprayed and the surface moisture is removed, it is sent into the grain conveying device (1). The grain conveying device (1) pushes the grain into the screening mechanism (3). The drive motor inside the auxiliary adjustment mechanism (9) drives the screening mechanism (3) to rotate slowly through the transmission component. When the screening mechanism (3) rotates the grain to the underside of the resistivity detection mechanism (4), the resistivity detection mechanism (4) cooperates with the auxiliary adjustment mechanism (9) to detect the resistivity of the grain particles. S2. After the resistivity of the grain is detected by the resistivity detection mechanism (4), the seeds are pre-selected and graded according to the different resistivity of the grain. The auxiliary adjustment mechanism (9) changes the position of the seeds inside the screening mechanism (3) by air jet, thereby realizing the grading of the seeds. S3. The graded seeds will be moved to the bottom of the grading visual inspection mechanism (5). The grading visual inspection mechanism (5) is equipped with two different types of visual inspection devices. One type is to use the grading visual inspection mechanism (5) to detect surface mold and color of the high-quality seeds after grading in the screening mechanism (3). The other type is to use the grading visual inspection mechanism (5) to detect seed defects of the seeds after grading in the screening mechanism (3). When the seeds detected by the grading visual inspection mechanism (5) are moved to the bottom of the inspection camera (10), the grain position adjustment mechanism (6) changes the position of the seeds inside the screening mechanism (3). By moving the position of the seed storage, the inspection camera (10) can perform a comprehensive inspection of the seeds.

Images