Cereal appearance detection device and method based on visual detection

Abstract

The invention discloses a grain appearance detection device and method based on visual inspection, and relates to the technical field of visual inspection.The grain appearance detection device comprises a detection box, a grain conveying device is arranged on one side of the detection box, and an auxiliary adjusting mechanism is arranged in the middle of the upper end of the detection box; and a screening mechanism for placing seeds for detection is arranged on the outer surface of the auxiliary adjusting mechanism. According to the electrical resistivity detection mechanism, grain quality evaluation and automatic grading are achieved, grains are soaked by spraying and surface moisture is removed before entering a detection process, seeds are in a uniform wet state, the electrical resistivity detection accuracy is improved, errors caused by drying are reduced, and the detection accuracy is improved. And then the resistivity detection mechanism is matched with the auxiliary adjustment mechanism to adopt a non-destructive detection mode, so that the health condition of the seeds can be evaluated on the premise of not damaging the seeds, and the incompleteness and size of the grains can be quickly and preliminarily graded according to the resistivity difference.

Description

Technical Field

[0001] The present invention relates to the technical field of visual inspection, and in particular to a grain appearance inspection device and method based on visual inspection. Background Art

[0002] For example, publication number CN107328681A, titled "A Machine Vision-Based Cereal and Legume Thousand-Kernel Weight and Moisture Content Detection System," is accurate and reliable, boasts a simple structure, and is highly versatile. It also reduces seed sticking and stacking, easing the difficulty of post-processing image processing and enabling detection of thousand-kernel weight and moisture content.

[0003] During the grain inspection process, if there are cavities, defects or size differences inside the grain, directly entering the visual inspection link without preliminary screening will lead to a decrease in image recognition accuracy, affecting 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 grain appearance detection device and method based on visual inspection, which can effectively solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a grain appearance inspection device based on visual inspection, comprising an inspection box, a grain conveying device is provided on one side of the inspection box, an auxiliary adjustment mechanism is provided in the middle of the upper end of the inspection box, a screening mechanism for placing seeds for inspection is provided on the outer surface of the auxiliary adjustment mechanism, a resistivity detection mechanism is provided on the upper end side of the inspection box to cooperate with the auxiliary adjustment mechanism to grade the seeds inside the screening mechanism, a grading visual inspection mechanism is provided on the upper end side of the inspection box to adopt different visual inspection methods for seeds of different grades inside the screening mechanism, an inspection camera is provided on the upper end side of the inspection box, a grain position adjustment mechanism is provided on the upper end of the auxiliary adjustment mechanism and the lower part of the grading visual inspection mechanism to adjust the position of the seeds inside the screening mechanism to assist the inspection camera for inspection, the grain position adjustment mechanism is located between the grading visual inspection mechanism and the inspection camera, a plurality of grain boxes are provided on the upper end side of the inspection box, and an air jet is provided on the upper end of the grain box; The resistivity detection mechanism includes a contact piece in the shape of the symbol "Ω" and a spring is arranged inside the contact piece.

[0006] Among them, the resistivity detection mechanism also includes a support seat, which is installed at the upper end of the detection box. A support rod is provided at the bottom of the support seat, and shaft rings are provided on both sides of the electric shock sheet, and the shaft rings are sleeved on the outer surface of the support rod.

[0007] Among them, the auxiliary adjustment mechanism includes a bracket tube and a middle support assembly installed at the upper end of the detection box, the upper end of the bracket tube is provided with a ring, the upper end of the ring is provided with a plastic ring and a metal gasket, the upper end of the middle support assembly is provided with an air jet pipe, and the interior of the middle support assembly is provided with a drive motor.

[0008] Among them, the screening mechanism includes a mounting plate, which is rotatably mounted on the outer surface of the middle support assembly through bearings and gears. A plurality of grain placement boxes distributed in a circular array are provided on the upper end of the mounting plate. A superior seed slot and an inferior seed slot are provided inside the grain placement box. A connecting pipe communicating with the interior of the superior seed slot is provided on one side of the grain placement box.

[0009] Wherein, a partition groove is provided in the middle of the upper end of the grain placement box, a guide groove is provided at the bottom of the grain placement box, and a bottom hole is provided on the bottom wall of the superior seed groove.

[0010] Among them, the grain position adjustment mechanism includes a support frame and a cover plate, the support frame is installed at the upper end of the middle support assembly, and the lower end of the support frame is provided with a ventilation pipe, and the ventilation pipe is located on both sides of the lower part of the detection camera.

[0011] Among them, the upper end of the cover is provided with a hole and two exhaust holes, the exhaust holes are connected to the inside of the ventilation pipe, the bottom of the cover is provided with a support rib, and the length of the support rib is two-thirds of the length of the cover, and the support rib is located inside the partition groove.

[0012] Among them, the graded visual inspection mechanism includes a camera frame, which is installed at the upper end of the inspection box, a reflective cover is provided at the bottom of the camera frame, 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 complementary color lamp is provided on the inner wall of the reflective cover and on one side of the partition, and a color adjustment cone is provided on the inner wall of the reflective sleeve and at the bottom of the complementary color lamp.

[0013] The inner wall of the reflective sleeve is provided with a fill light and a fill light plate, the bottom of the reflective sleeve is symmetrically provided with two reflective sheets, the bottoms of the two reflective sheets are jointly provided with a mounting tube, and the mounting tube is installed inside the hole.

[0014] The present invention also provides a method for detecting the appearance of grains, and the specific detection method is as follows: S1. After being spray-moistened and surface moisture removed, the grain is fed into the grain conveying device. The grain conveying device pushes the grains onto the screening mechanism, while the drive motor inside the auxiliary adjustment mechanism drives the screening mechanism to rotate slowly through the transmission assembly. When the screening mechanism rotates the grains to the bottom of the resistivity detection mechanism, the resistivity detection mechanism cooperates with the auxiliary adjustment mechanism to perform resistivity detection on the grain particles. S2. After the grains are tested for resistivity 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 through air jets, thereby achieving seed grading. S3. The graded seeds will be moved to the bottom of the grading visual inspection mechanism, and two different types of visual inspection equipment are set inside the grading visual inspection mechanism. One is to use the grading visual inspection mechanism to provide surface mildew and color inspection for the high-quality seeds after grading inside the screening mechanism, and the other is to use the grading visual inspection mechanism to provide seed defect inspection for the seeds after grading processing inside the screening mechanism. When the seeds inspected by the grading visual inspection mechanism move to the bottom of the inspection camera, the grain position adjustment mechanism changes the placement of the seeds inside the screening mechanism. By moving the seed storage position, the inspection camera can conduct a comprehensive inspection of the seeds.

[0015] In summary, the technical effects and advantages of the present invention are: 1. The resistivity detection mechanism of the present invention realizes the assessment and automatic grading of grain quality. Before entering the testing process, the grain is sprayed and soaked to remove surface moisture, so that the seeds are in a uniformly moist state, improving the accuracy of resistivity detection and reducing errors caused by drying. Then, the resistivity detection mechanism cooperates with the auxiliary adjustment mechanism to adopt a non-destructive detection method. It can evaluate the health status of the seeds without damaging them, and quickly perform preliminary grading of the grain defects and size based on resistivity differences.

[0016] 2. In the present invention, after preliminary grading, the seeds enter the visual inspection stage. The grading visual inspection mechanism is equipped with two different types of detection equipment. One is used for mildew and color detection of high-quality seeds, which can effectively identify seeds with surface diseases or discoloration. The other is used to detect defects in secondary seeds to determine whether they are suitable for further processing or planting. It comprehensively evaluates seed integrity from multiple angles and improves detection accuracy and classification reliability.

[0017] 3. The grain position adjustment mechanism provided in the present invention cooperates with the auxiliary detection camera to ensure the comprehensiveness of the detection, and dynamically adjusts the seed placement position below the detection camera to avoid missed detection due to occlusion or viewing angle limitation, thereby realizing all-round image acquisition of each seed, significantly improving the image acquisition coverage and detection consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the first-person perspective stereoscopic structure of a grain appearance inspection device based on visual inspection; Figure 2 It is a schematic diagram of the second perspective stereoscopic structure of a grain appearance detection device based on visual detection; Figure 3 A schematic diagram of the third-perspective stereoscopic structure of a grain appearance inspection device based on visual inspection; Figure 4 Schematic diagram of the local first-person perspective stereo connection structure based on visual detection; Figure 5 Schematic diagram of the local second-view stereo connection structure based on visual detection; Figure 6 Schematic diagram of the local third-perspective stereo connection structure based on visual detection; Figure 7 A schematic diagram of the first-person perspective three-dimensional connection structure of the auxiliary adjustment mechanism; Figure 8 A schematic diagram of the second perspective three-dimensional connection structure of the auxiliary adjustment mechanism; Figure 9 A schematic diagram of the three-dimensional connection structure of the auxiliary adjustment mechanism and the screening mechanism; Figure 10 A schematic diagram of the first-person perspective three-dimensional connection structure of the grain position adjustment mechanism; Figure 11 A schematic diagram of the second perspective three-dimensional connection structure of the grain position adjustment mechanism; Figure 12 A schematic diagram of the first-person perspective three-dimensional connection structure of the screening mechanism; Figure 13 A schematic diagram of the second perspective three-dimensional connection structure of the screening mechanism; Figure 14 It is a schematic diagram of the local three-dimensional connection structure of the screening mechanism; Figure 15 This is a schematic diagram of the three-dimensional connection structure of the grain display box; Figure 16 It is a schematic diagram of the three-dimensional connection structure of the superior seed tank and the inferior seed tank; Figure 17 It is a schematic diagram of the three-dimensional connection structure of the resistivity detection mechanism; Figure 18 It is a schematic diagram of the local three-dimensional connection structure of the resistivity detection mechanism; Figure 19 It is a schematic diagram of the three-dimensional connection structure of the electric contact piece and the spring; Figure 20 A schematic diagram of the first-person perspective stereoscopic connection structure of a graded visual inspection mechanism; Figure 21 A schematic diagram of the second-view stereoscopic connection structure of the graded visual inspection mechanism; Figure 22 It is a schematic diagram of the three-dimensional connection structure of the reflective cover and the partition; Figure 23 It is a schematic diagram of the three-dimensional connection structure of the reflective sleeve and the reflective sheet; Figure 24 This is a schematic diagram of the three-dimensional connection structure of the color-adjusting cone and the reflective sleeve; Figure 25 This is a distribution diagram of the positions of the color adjustment cone and the fill light plate inside the reflective sleeve.

[0020] In the figure: 1. Grain conveying device; 2. Detection box; 3. Screening mechanism; 31. Mounting plate; 32. Grain placing box; 33. Connecting pipe; 34. Guide groove; 35. Bottom hole; 36. Separation groove; 37. Inferior seed groove; 38. Superior seed groove; 4. Resistivity detection mechanism; 41. Support seat; 42. Electric shock plate; 43. Support rod; 44. Shaft ring; 45. Spring; 5. Grading visual detection mechanism; 51. Camera frame; 52. Reflective cover; 53. Reflective sleeve; 54. Reflective sheet; 55. 5. Mounting tube; 56. Partition; 57. Complementary color lamp; 58. Complementary light; 59. Complementary light board; 50. Color adjustment cone; 6. Grain position adjustment mechanism; 61. Support frame; 62. Cover; 63. Support rib; 64. Hole; 65. Exhaust hole; 66. Vent pipe; 7. Grain box; 8. Jet port; 9. Auxiliary adjustment mechanism; 91. Bracket tube; 92. Middle support assembly; 93. Jet pipe; 94. Metal gasket; 95. Plastic ring; 96. Ring; 10. Detection camera. DETAILED DESCRIPTION

[0021] 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.

[0022] Example 1, Reference Figures 1 to 25The device and method for grain appearance inspection based on visual inspection are shown, comprising an inspection box 2, a grain conveying device 1 being provided on one side of the inspection box 2, an auxiliary adjustment mechanism 9 being provided on the middle part of the upper end of the inspection box 2, a screening mechanism 3 for placing seeds for inspection being provided on the outer surface of the auxiliary adjustment mechanism 9, a resistivity detection mechanism 4 being provided on the upper end side of the inspection box 2 for cooperating with the auxiliary adjustment mechanism 9 to grade the seeds inside the screening mechanism 3, a grading visual inspection mechanism 5 being provided on the upper end side of the inspection box 2 for adopting different visual inspection methods for seeds of different grades inside the screening mechanism 3, an inspection camera 10 being provided on the upper end side of the inspection box 2, a grain position adjustment mechanism 6 for adjusting the position of the seeds inside the screening mechanism 3 to assist the inspection camera 10 for inspection being provided on the upper end of the auxiliary adjustment mechanism 9 and the lower part of the grading visual inspection mechanism 5, the grain position adjustment mechanism 6 being located between the grading visual inspection mechanism 5 and the inspection camera 10, a plurality of grain boxes 7 being provided on the upper end side of the inspection box 2, and an air jet 8 being provided on the upper end of the grain box 7.

[0023] It is worth noting that after the grains are spray-moistened and their surface moisture is removed, they are fed into the grain conveying device 1. The grain conveying device 1 pushes the grains onto the screening mechanism 3, and the drive motor inside the auxiliary adjustment mechanism 9 drives the screening mechanism 3 to rotate slowly through the transmission assembly. When the screening mechanism 3 rotates the grains to the bottom of the resistivity detection mechanism 4, the resistivity detection mechanism 4 cooperates with the auxiliary adjustment mechanism 9 to perform resistivity detection on the grain particles. After the grains are tested for resistivity by the resistivity detection mechanism 4, the seeds are pre-selected and graded according to the different resistivities of the grains, and the auxiliary adjustment mechanism 9 changes the position of the seeds inside the screening mechanism 3 by air jets to achieve seed grading. Among them, spray soaking can make the surface of the grain evenly moist, which helps to measure its resistivity more accurately. The moistened grain can conduct electricity better, thereby reducing the high resistance error caused by drying. The resistivity detection mechanism 4 is a non-destructive detection method that can evaluate the health status of the seeds without damaging them. Based on the difference in resistivity, the grains can be quickly divided into different grades, providing a basis for subsequent processing. The resistivity data of each seed can be recorded in real time to facilitate subsequent statistical analysis and quality traceability.

[0024] The graded seeds will be moved to the bottom of the grading visual inspection mechanism 5, and two different types of visual inspection equipment are set inside the grading visual inspection mechanism 5. One is to use the grading visual inspection mechanism 5 to provide surface mildew and color detection for the high-quality seeds after grading inside the screening mechanism 3, and the other is to use the grading visual inspection mechanism 5 to provide seed defect detection for the seeds after grading processing inside the screening mechanism 3. When the seeds inspected by the grading visual inspection mechanism 5 move to the bottom of the detection 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 detection camera 10 can perform a comprehensive inspection of the seeds.

[0025] Among them, the grading visual inspection agency 5 can effectively screen out seeds with surface diseases or discoloration by inspecting the surface mildew and color of high-quality seeds, ensuring that only healthy seeds enter the subsequent processing or planting stages. The use of specially designed visual inspection equipment can capture subtle color changes and surface defects, providing higher detection accuracy.

[0026] For secondary seeds, the focus is on detecting whether they have cracks, damage or other internal structural defects, so as to determine whether they are suitable for further processing or planting. Combining various visual inspection technologies such as texture analysis and morphological operations, the integrity of the seeds can be comprehensively evaluated from different angles, and the test results of each seed can be recorded and analyzed to provide a scientific basis for subsequent processing.

[0027] The grain position adjustment mechanism 6 changes the placement of the seeds to ensure that each seed can be photographed from multiple angles by the detection camera, avoiding missed detection due to occlusion or limited viewing angle. The dynamic adjustment of the seed position enables the detection camera to fully cover all surfaces of the seeds, thereby improving the accuracy and reliability of the detection.

[0028] Embodiment 2: Based on the auxiliary adjustment mechanism 9, screening mechanism 3 and resistivity detection mechanism 4 proposed in embodiment 1, this embodiment provides a further technical solution for the auxiliary adjustment mechanism 9, screening mechanism 3 and resistivity detection mechanism 4.

[0029] The screening mechanism 3 includes a mounting plate 31, which is rotatably mounted on the outer surface of the middle support assembly 92 through bearings and gears. A plurality of grain placement boxes 32 distributed in a circular array are provided on the upper end of the mounting plate 31. The interior of the grain placement box 32 is provided with a superior seed slot 38 and an inferior seed slot 37. A connecting pipe 33 communicating with the interior of the superior seed slot 38 is provided on one side of the grain placement box 32.

[0030] A partition groove 36 is provided at the middle of the upper end of the grain placement box 32 , a guide groove 34 is provided at the bottom of the grain placement box 32 , and a bottom hole 35 is provided on the bottom wall of the superior seed groove 38 .

[0031] The auxiliary adjustment mechanism 9 includes a bracket tube 91 and a middle support assembly 92 installed at the upper end of the detection box 2. The upper end of the bracket tube 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 injection pipe 93, and a drive motor is provided inside the middle support assembly 92.

[0032] It is worth noting that the grains first fall into the superior seed trough 38 through the grain conveying device 1, and further fall into the bottom hole 35. At this time, the driving motor inside the middle support assembly 92 drives the mounting plate 31 to rotate through gears and bearings, and 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 clamped on the surface of the ring 96 to ensure its stable operation.

[0033] During the rotation process, the grains in the superior seed slot 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, so that the grains change their positions as the grain placement box 32 rotates, so that the grains in the superior seed slot 38 can follow the rotation to achieve posture adjustment, which is convenient for the subsequent grading visual inspection mechanism 5 to perform multi-angle and all-round inspection on them.

[0034] Among them, the mounting plate 31 and the grain placement box 32 are driven to rotate by a driving motor, so that the grains in the superior seed slot 38 can automatically adjust their posture under the combined action of centrifugal force and friction force. The guide groove 34 at the bottom of the grain placement box 32 and the surface of the ring 96 are snap-fitted to ensure the smooth operation during the rotation process. The grains change position together with the superior seed slot 38 during the rotation process, so that the grading visual inspection mechanism 5 can perform all-round inspection of each grain from multiple angles, thereby significantly improving the detection accuracy and recognition rate.

[0035] The resistivity detection mechanism 4 includes a contact plate 42, which is in the shape of the symbol "Ω" and a spring 45 is provided inside the contact plate 42. The resistivity detection mechanism 4 also includes a support seat 41, which is installed at the upper end of the detection box 2. A support rod 43 is provided at the bottom of the support seat 41, and shaft rings 44 are provided on both sides of the contact plate 42. The shaft rings 44 are sleeved on the outer surface of the support rod 43.

[0036] Among them, when the grain moves to the position of the metal gasket 94 along with the grain display box 32, the set electric shock piece 42 is in the shape of the symbol "Ω", so that the electric shock piece 42 can be engaged in the interior of the superior seed slot 38, and when the electric shock piece 42 is located inside the superior seed slot 38, the set electric shock piece 42 squeezes the grain inside the superior seed slot 38, and the electric shock piece 42 contacts the grain inside the superior seed slot 38, and the grain will also contact the metal gasket 94 through the bottom hole 35. The resistivity of the grain is detected by the combination of the electric shock piece 42 and the metal gasket 94, and the grain is screened and graded by detecting the resistivity of different grain particles. When the grain passes the resistivity test, the air jet 93 jets into the interior of the connecting pipe 33, blowing the inferior seeds inside the superior seed slot 38 into the interior of the inferior seed slot 37, and the high-quality seeds will remain inside the superior seed slot 38. Because the resistivity of the incomplete seeds and the seeds with smaller seed particles is different from that of the high-quality seeds, the seeds can be pre-screened according to the different resistivities.

[0037] Among them, the rotation of the grain placement box 32 drives the grain into the detection area, realizing the orderly transportation and positioning of the seeds, and the electric shock sheet 42 is "Ω" shaped and inserted into the interior of the superior seed slot 38, contacting and squeezing the grain to form a stable electrode contact, and the metal gasket 94 and the electric shock sheet 42 together constitute a complete current path. Through the resistivity detection mechanism, the grain is clamped between the electric shock sheet 42 and the metal gasket 94 to form a resistance measurement circuit, thereby realizing a preliminary judgment on the seed quality. After the detection is completed, the air jet tube 93 is linked with the connecting tube 33 to identify inferior seeds according to the resistivity results, and blow them into the inferior seed slot 37 by air jet to complete automatic grading.

[0038] Among them, the design of the electric shock sheet 42 can effectively resist the grains, enhance contact stability, and improve detection consistency. At the same time, it has elastic adaptability and can adapt to seeds of different particle sizes to avoid poor contact due to size differences. The resistivity detection method formed by the combination of the electric shock sheet 42 and the metal gasket 94 is a non-destructive detection method that retains seed activity and is suitable for a variety of grains such as wheat, corn, and rice. It has good versatility and broad application prospects. The resistivity difference can be used to quickly identify incomplete, shriveled or moldy seeds. These seeds usually exhibit lower resistivity due to damaged cell membranes or abnormal moisture content, thereby providing an efficient basis for subsequent screening.

[0039] Embodiment 3: Based on the grain position adjustment mechanism 6 and the grading visual detection mechanism 5 proposed in embodiment 1, this embodiment provides a further technical solution for the grain position adjustment mechanism 6 and the grading visual detection mechanism 5.

[0040] The graded visual inspection mechanism 5 includes a camera frame 51, which is installed at the upper end of the inspection box 2. A reflective cover 52 is provided at the bottom of the camera frame 51, and a reflective sleeve 53 is provided at the bottom of the reflective cover 52. A partition 56 is provided in the middle of the inner wall of the reflective cover 52 and the reflective sleeve 53. A complementary color lamp 57 is provided on the inner wall of the reflective cover 52 and on one side of the partition 56. A color adjustment cone 50 is provided on the inner wall of the reflective sleeve 53 and at the bottom of the complementary color lamp 57.

[0041] The inner wall of the reflective sleeve 53 is provided with a fill light 58 and a fill light plate 59. Two reflective sheets 54 are symmetrically provided at the bottom of the reflective sleeve 53. The bottom of the two reflective sheets 54 is jointly provided with a mounting tube 55. The mounting tube 55 is installed inside the hole 64. The reflective sheets 54 and the mounting tube 55 are used to isolate the influence of external light on visual detection, and 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 detection effect when detecting seeds inside the superior seed slot 38 and the inferior seed slot 37.

[0042] It is worth noting that after the grains in the grain placement box 32 are graded and screened, the grains will be moved to the bottom of the mounting cylinder 55 as the grain placement box 32 moves. The grain placement box 32 is arranged in an array in the shape of a ring. The high-quality seeds in the so-called high-quality seed slot 38 are located at the inner diameter of the ring, while the seeds in the low-quality seed slot 37 are located at the outer diameter of the ring. The seeds inside the superior seed slot 38 will move to the bottom of the color-adjusting cone 50, and the complementary color light 57 will provide fill-in light according to the degree of color of different grains, so that the camera above the complementary color light 57 can be illuminated by the fill-in light of the complementary color light 57, and then the color of the light is adjusted by the color-adjusting cone 50 to detect the mold spots on the surface of the grain and the maturity of the grain. The seeds inside the inferior seed slot 37 will move to the bottom of the fill-in light 58. Through the cooperation of the fill-in light 58 and the fill-in light board 59, the grain inside the inferior seed slot 37 is in a strong light state, and then the camera above the fill-in light board 59 can clearly detect the damage of the grain.

[0043] Among them, the color-compensating lamp 57 adjusts the color temperature or spectral composition of the light source according to the color of the grains in the superior seed trough 38, and the color-adjusting cone 50 further optimizes the light direction and color uniformity, and cooperates with the camera to capture high-quality images, thereby significantly enhancing the ability to identify moldy spots, and can accurately judge the maturity of seeds, and reduce ambient light interference through precise light control.

[0044] For the detection of grains in the inferior seed trough 37, strong light irradiation combined with a fill light plate 59 is used to form a uniform background light or contour light, so that the camera can obtain high-contrast images, thereby efficiently identifying defective seeds with irregular edges or problems such as damage or cracks. Even inferior seeds with rough surfaces or uneven colors can obtain clear contour images through backlighting.

[0045] The grain position adjustment mechanism 6 includes a support frame 61 and a cover plate 62 . The support frame 61 is installed at the upper end of the middle support assembly 92 . A ventilation pipe 66 is provided at the lower end of the support frame 61 . The ventilation pipe 66 is located on both sides of the lower part of the detection camera 10 .

[0046] A hole 64 and two exhaust holes 65 are provided at the upper end of the cover 62. The exhaust holes 65 are communicated with the interior of the ventilation pipe 66. A support rib 63 is provided at the bottom of the cover 62, and the length of the support rib 63 is two-thirds of the length of the cover 62. This design can prevent grain from falling into the inferior seed groove 37 when the air jet pipe 93 blows air into the interior of the connecting pipe 33. The support rib 63 is located inside the partition groove 36.

[0047] Among them, after the grain is inspected by the grading visual inspection mechanism 5, the grain inspected by the grading visual inspection mechanism 5 is moved to the bottom of the inspection camera 10 as the screening mechanism 3 rotates. In order to allow the inspection camera 10 to detect grains at multiple angles inside the superior seed slot 38 and the inferior seed slot 37, air is sprayed to the exhaust hole 65 through the vent pipe 66, and the cover 62 covers the surface of the grain placement box 32, and the support ribs 63 are stuck inside the partition slot 36, so that the space inside the superior seed slot 38 and the inferior seed slot 37 is closed, preventing the grain from being blown out from the inside of the grain placement box 32 when the exhaust hole 65 blows air into the superior seed slot 38 and the inferior seed slot 37, and the inspection camera 10 is used to finally perform a full-scale inspection of the grain. The grain after inspection by the inspection camera 10 will move to different grain box 7 positions as the screening mechanism 3 rotates, and then the grain is blown into the interior of the grain box 7 through the air jet 8 for screening.

[0048] Among them, the ventilation pipe 66 sprays air to the exhaust hole 65 to regulate the posture of the grain, and the directional air jet ensures that the airflow only acts on a specific area and does not affect other parts. At the same time, the air jet operation is performed in the closed space formed by the cover 62 and the support rib 63, which can effectively adjust the position of the grain without causing it to fly out of the grain placement box 32. The detection camera 10 is used to perform the final all-round detection of the grain after the airflow posture is adjusted. The multi-angle imaging technology enables the camera to capture images from different perspectives and comprehensively identify seed surface features such as mold spots, cracks, etc., significantly improving the detection accuracy. The high-resolution industrial camera can obtain clear images.

[0049] Finally, it should be noted that the above 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A grain appearance inspection device based on visual inspection, comprising an inspection box (2), a grain conveying device (1) being provided on one side of the inspection box (2), characterized in that: An auxiliary adjustment mechanism (9) is provided at the middle of the upper end of the detection box (2), and 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) for grading the seeds inside the screening mechanism (3) in cooperation with the auxiliary adjustment mechanism (9) is provided on one side of the upper end of the detection box (2). A grading visual detection mechanism (5) for adopting different visual detection methods for seeds of different grades inside the screening mechanism (3) is provided on one side of the upper end of the detection box (2). A detection camera (10) is provided on one side of the upper end of the detection box (2). A grain position adjustment mechanism (6) for adjusting the position of the seeds inside the screening mechanism (3) for the auxiliary detection camera (10) to detect is provided at the upper end of the auxiliary adjustment mechanism (9) and the lower part of the grading visual detection mechanism (5). The grain position adjustment mechanism (6) is located between the grading visual detection mechanism (5) and the detection camera (10). A plurality of grain boxes (7) are provided on one side of the upper end of the detection box (2), and an air jet (8) is provided at the upper end of the grain box (7). The resistivity detection mechanism (4) comprises a contact plate (42), the contact plate (42) is in the shape of the symbol "Ω", and a spring (45) is provided inside the contact plate (42).

2. The grain appearance detection device based on visual inspection according to claim 1, characterized in that: The resistivity detection mechanism (4) further comprises a support base (41), the support base (41) being mounted on the upper end of the detection box (2), a support rod (43) being provided at the bottom of the support base (41), and shaft rings (44) being provided on both sides of the electric shock sheet (42), the shaft rings (44) being sleeved on the outer surface of the support rod (43).

3. The grain appearance detection device based on visual inspection according to claim 1, characterized in that: The auxiliary adjustment mechanism (9) comprises a support tube (91) and a middle support assembly (92) mounted on the upper end of the detection box (2); a ring (96) is provided at the upper end of the support tube (91); a plastic ring (95) and a metal gasket (94) are provided at the upper end of the ring (96); an air jet tube (93) is provided at the upper end of the middle support assembly (92); and a driving motor is provided inside the middle support assembly (92).

4. The grain appearance detection device based on visual inspection according to claim 1, characterized in that: The screening mechanism (3) includes a mounting plate (31), the mounting plate (31) being rotatably mounted on the outer surface of the middle support assembly (92) via bearings and gears, a plurality of grain placement boxes (32) distributed in a circular array being provided at the upper end of the mounting plate (31), a superior seed trough (38) and an inferior seed trough (37) being provided inside the grain placement box (32), and a connecting pipe (33) communicating with the interior of the superior seed trough (38) being provided on one side of the grain placement box (32).

5. The grain appearance detection device based on visual inspection according to claim 4, characterized in that: A separation groove (36) is provided at the middle of the upper end of the grain placement box (32), a guide groove (34) is provided at the bottom of the grain placement box (32), and a bottom hole (35) is provided at the bottom wall of the superior seed groove (38).

6. The grain appearance detection device based on visual inspection according to claim 1, characterized in that: The grain position adjustment mechanism (6) comprises a support frame (61) and a cover plate (62), wherein the support frame (61) is mounted on the upper end of the middle support assembly (92), and a ventilation pipe (66) is provided at the lower end of the support frame (61), and the ventilation pipe (66) is located on both sides of the lower part of the detection camera (10).

7. The grain appearance detection device based on visual inspection according to claim 6, characterized in that: The upper end of the cover plate (62) is provided with a hole (64) and two exhaust holes (65), and the exhaust holes (65) are communicated with 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) accounts for two-thirds of the length of the cover plate (62). The support rib (63) is located inside the partition groove (36).

8. The grain appearance detection device based on visual inspection according to claim 7, characterized in that: The grading visual inspection mechanism (5) comprises a camera frame (51), the camera frame (51) being mounted on the upper end of the inspection box (2), a reflective cover (52) being provided at the bottom of the camera frame (51), a reflective sleeve (53) being provided at the bottom of the reflective cover (52), a partition (56) being provided in the middle of the inner walls of the reflective cover (52) and the reflective sleeve (53), a complementary color lamp (57) being provided on the inner wall of the reflective cover (52) and located on one side of the partition (56), and a color adjustment cone (50) being provided on the inner wall of the reflective sleeve (53) and located at the bottom of the complementary color lamp (57).

9. The grain appearance detection device based on visual inspection according to claim 8, characterized in that: The inner wall of the reflective sleeve (53) is provided with a fill light (58) and a fill light plate (59), and the bottom of the reflective sleeve (53) is symmetrically provided with two reflective sheets (54), and the bottoms of the two reflective sheets (54) are jointly provided with a mounting tube (55), and the mounting tube (55) is installed inside the hole (64).

10. A method for detecting grain appearance based on visual inspection, using a grain appearance detection device based on visual inspection according to any one of claims 1 to 9, characterized in that: The specific detection methods are as follows: S1. After the grains are spray-moistened and their surface moisture is removed, they are fed into the interior of the grain conveying device (1). The grain conveying device (1) pushes the grains onto the screening mechanism (3), and the driving motor inside the auxiliary adjustment mechanism (9) drives the screening mechanism (3) to rotate slowly through the transmission assembly. When the screening mechanism (3) rotates the grains to the bottom of the resistivity detection mechanism (4), the resistivity detection mechanism (4) cooperates with the auxiliary adjustment mechanism (9) to perform resistivity detection on the grain particles. S2. After the grains are tested for resistivity by the resistivity detection mechanism (4), the seeds are pre-selected and graded according to the different resistivities of the grains, and the auxiliary adjustment mechanism (9) changes the position of the seeds inside the screening mechanism (3) by air jets, thereby achieving seed grading; S3. The seeds after grading will be moved to the bottom of the grading visual inspection mechanism (5), and two different types of visual inspection equipment are set inside the grading visual inspection mechanism (5). One is to use the grading visual inspection mechanism (5) to provide surface mildew and color detection for the high-quality seeds after grading inside the screening mechanism (3), and the other is to use the grading visual inspection mechanism (5) to provide seed defect detection for the seeds after grading treatment inside the screening mechanism (3). When the seeds after inspection by the grading visual inspection mechanism (5) move to the bottom of the inspection camera (10), the grain position adjustment mechanism (6) changes the placement position 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.

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