A non-destructive testing and grading apparatus for strawberries

Abstract

A kind of strawberry nondestructive testing grading device, the input of conveying device is equipped with feeding device, the output of conveying device is equipped with quality grading device, conveying device is also equipped with shunt plate, size image acquisition device and size grading auxiliary device.Feeding device can transport strawberry to the conveying belt of conveying device, shunt strawberry through shunt plate, can make strawberry be divided into two rows and be sequentially conveyed to size image acquisition device, divide strawberry into defective and non-defective, then through the movement of the guide push plate of size grading auxiliary device, can make two rows of strawberry respectively enter guide channel, then be sent to non-defective conveying area and defective conveying area, the strawberry of defective conveying area can directly enter defective collection box, the strawberry of non-defective conveying area will enter grading channel between driven air-filled roller and screw conveying roller through non-defective chute, and fall to the corresponding grading collection box below, realize the grading storage of strawberry.

Description

Technical Field

[0001] This invention relates to the field of strawberry grading, and more particularly to a non-destructive testing and grading device for strawberries. Background Technology

[0002] Strawberries are perennial herbaceous plants belonging to the genus Fragaria of the Rosaceae family. They are known as the "Queen of Fruits" and the "First Fruit of Early Spring" because their berries are fragrant, juicy, and nutritious. Strawberries are rich in vitamins, calcium, phosphorus, iron, and other nutrients, and contain many active substances, giving them high nutritional, medicinal, and ecological value. In recent years, with the continuous improvement of people's living standards, the demand for this healthy food has been increasing.

[0003] Strawberry grading is a crucial step in the marketization of strawberries. Currently, there are two main problems in strawberry grading: First, grading efficiency is low. Because strawberries are delicate and lack protective tissue, they are easily damaged. The currently popular mechanical grading machines are not suitable for strawberry grading, resulting in low levels of mechanization and automation, with manual sorting being the primary method. Second, grading standards are inconsistent and grading quality is low. Since manual grading relies on observation, there are many subjective human factors involved. At the same time, long hours of repetitive work can lead to fatigue, affecting grading quality. Manual grading not only lacks scientific grading standards but also struggles to guarantee consistent quality. Commonly used grading methods such as drum screens, color sorters, and weighing machines have limited grading standards and cannot comprehensively evaluate strawberries, resulting in relatively low grading quality. Summary of the Invention

[0004] The purpose of this invention is to provide a non-destructive testing and grading device for strawberries, which can achieve efficient, low-damage real-time screening and classification of strawberries with a high degree of automation and high grading efficiency.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a strawberry non-destructive testing and grading device, including a conveying device, a feeding device at the input end of the conveying device, a quality grading device at the output end of the conveying device, a diverter plate, a size image acquisition device and a size grading auxiliary device on the conveying device, the conveying device including a conveying support, a conveying active roller and a conveying driven roller installed on the conveying support, a conveyor belt fitted on the conveying active roller and the conveying driven roller, and a conveying motor for driving the conveying active roller to rotate on the conveying support;

[0006] The feeding device includes a storage bin and a feeding support. The feeding support is equipped with a feeding driven roller and a feeding active roller. A feeding conveyor belt is fitted on the feeding driven roller and the feeding active roller. The lower end of the feeding conveyor belt extends into the storage bin, and the upper end of the feeding conveyor belt is located above the input end of the conveyor belt. Multiple feeding baffles are spaced apart on the surface of the feeding conveyor belt. The feeding baffles can drive the strawberries in the storage bin to move from the lower end to the upper end of the feeding conveyor belt, so that the strawberries can fall from the upper end of the feeding conveyor belt to the upper surface of the input end of the conveyor belt.

[0007] The diverter plate is located above the conveyor belt and close to the input end of the conveyor belt. The diverter plate has multiple inclined surfaces on the side facing the input end. These inclined surfaces can guide and divert the movement direction of multiple strawberries on the conveyor belt, so that multiple strawberries on the conveyor belt can move to both sides of the diverter plate in sequence, thereby dividing the multiple strawberries into two rows and conveying them in sequence on the conveyor belt.

[0008] The size image acquisition device includes a box covered above the conveyor belt. The top inner wall of the box is equipped with a light source and a high-speed industrial camera. The side wall of the box is also equipped with a photoelectric sensor. The photoelectric sensor can detect strawberries moving into the box. The computer controls the high-speed industrial camera to acquire images of the strawberries inside the box through the detection data of the photoelectric sensor. The computer can obtain the position of the strawberry on the conveyor belt, as well as the maximum transverse diameter and maximum length of the strawberry based on the image data acquired by the high-speed industrial camera. The computer classifies the strawberries as defective or non-defective based on the maximum transverse diameter and maximum length.

[0009] The size grading auxiliary device is located between the housing and the output end of the conveyor belt. The device includes one or more slide rails positioned above the conveyor belt. Both the slide rails and the upper surface of the conveyor belt are horizontally arranged, and the length direction of the slide rails is perpendicular to the length direction of the conveyor belt. When there are multiple slide rails, they are spaced apart along the length direction of the conveyor belt. Multiple sliding sleeves are fitted onto the slide rails, and guide motors are mounted on the sliding sleeves. Rollers are mounted on the output shafts of the guide motors, allowing the rollers to roll on the slide rails and drive the sliding sleeves to move along them. A sleeve bracket is connected to the bottom end of each sliding sleeve, and a guide push plate is connected to the bottom end of the sleeve bracket. The plate has a guide channel for strawberries to pass through. The length of the guide channel is parallel to the length of the conveyor belt. The computer can control the guide motor to drive the roller to rotate according to the position of the strawberry on the conveyor belt, so that the guide push plate moves with the sliding sleeve and the strawberry enters the guide channel. After the strawberry enters the guide channel, the computer can control the movement of the guide push plate according to whether the strawberry is non-defective or defective. This way, non-defective strawberries are sent out of the guide channel and are located in the non-defective conveying area near the two sides of the width direction of the conveyor belt, while defective strawberries are sent out of the guide channel and are located in the defective conveying area near the middle of the width direction of the conveyor belt.

[0010] The quality grading device includes a quality grading support frame. A defective product collection box is located on the side of the quality grading support frame near the output end of the conveyor belt. The opening of the defective product collection box faces the output end of the defective product conveying area, allowing defective strawberries to enter the defective product collection box from the defective product conveying area. Non-defective product chutes are opened on both sides of the defective product collection box. Both non-defective product chutes are inclined, and their top openings face the output ends of their respective non-defective product conveying areas, allowing non-defective strawberries to enter their respective non-defective product chutes from the non-defective product conveying areas. Two threaded conveying rollers and multiple driven air-inflating rollers are rotatably mounted on the quality grading support frame. Both the threaded conveying rollers and driven air-inflating rollers are horizontally arranged, and their length directions are parallel to the length direction of the conveyor belt. The multiple driven air-inflating rollers are divided into two equal groups, with the multiple driven air-inflating rollers in each group arranged axially and with their axes overlapping. An air storage tank is located on the quality grading support frame, and the air storage tank is connected to the multiple driven air-inflating rollers via air inflation / deflation pipes. Two sets of driven air rollers and two threaded conveyor rollers form two grading channels. The two grading channels open towards the bottom of the two non-defective chutes. When multiple driven air rollers in the same set are inflated, the grading channels can receive strawberries sent from the non-defective chutes. A quality grading motor is installed on the quality grading bracket to drive the threaded conveyor rollers to rotate. The threaded conveyor rollers can simultaneously drive the strawberries and the driven air rollers that receive the strawberries to rotate, and drive the strawberries to move along the length of the grading channels through the threaded structure on the surface of the threaded conveyor rollers.

[0011] Below the quality grading support are multiple open-topped grading collection boxes, spaced apart along the length of the grading channel. Below the multiple driven air rollers in the same group are different grading collection boxes. Two motion compensation cameras are mounted on the quality grading support, capable of capturing images of strawberries in the two grading channels. The computer can create a 3D model of the strawberries based on the image data and grade them according to the 3D model. Based on the grading results, the computer controls the quality grading motor to rotate the threaded conveyor rollers, moving the strawberries in the grading channel to the grading collection box corresponding to the grading result. The computer determines the strawberry's position based on the image data from the motion compensation cameras and, upon reaching the correct position, controls the driven air rollers above the corresponding grading collection box to deflate and retract, causing the strawberry to fall from the grading channel into the corresponding grading collection box.

[0012] Preferably, the feeding partition is a rectangular flat plate, and the feeding partition is perpendicular to the length direction of the feeding conveyor belt.

[0013] Preferably, the length direction of the feeding conveyor belt is parallel to the length direction of the conveyor belt.

[0014] Preferably, baffles are provided on both sides of the conveyor belt. The baffles on both sides can block the movement of strawberries from both sides of the diverter towards the edge of the conveyor belt, so that multiple strawberries are divided into two rows close to the baffles on both sides on the conveyor belt.

[0015] Preferably, when both the maximum transverse diameter and the maximum length reach the threshold, the computer classifies the strawberries as non-defective; otherwise, it classifies the strawberries as defective.

[0016] Preferably, the guide plate includes two rectangular clamps arranged opposite each other, the length direction of the rectangular clamps is parallel to the length direction of the conveyor belt, and the two rectangular clamps cooperate to form a guide channel.

[0017] Preferably, the size grading auxiliary device includes a slide rail with two sliding sleeves mounted on it.

[0018] Preferably, the computer is set on an operating table located on one side of the conveyor support, and the photoelectric sensor and the high-speed industrial camera are connected to the computer via data cables.

[0019] Preferably, the length direction of the non-defective chute is parallel to the length direction of the conveyor belt.

[0020] Preferably, the inflation / deflation pipe is equipped with a solenoid valve that can control multiple driven inflation rollers to inflate or deflate.

[0021] According to the above technical solution, the beneficial effects of the present invention are:

[0022] This invention utilizes multiple feeding baffles on the feeding conveyor belt of the feeding device to transport strawberries to the conveyor belt. A diverter plate separates the strawberries, allowing them to be transported in two columns to a size image acquisition device, thus classifying them as defective and non-defective. The movement of the guide plate in the size grading auxiliary device guides the two columns of strawberries into guide channels, from where they are sent to the non-defective and defective conveying areas. Strawberries in the defective conveying area directly enter the defective collection bin, while strawberries in the non-defective conveying area enter the grading channel between the driven air roller and the threaded conveying roller via a non-defective chute. The threaded conveying roller simultaneously rotates the strawberries and moves them along the grading channel, enabling a motion compensation camera to acquire multi-directional image information during the strawberry rotation. This allows the computer to perform 3D reconstruction of the strawberries and analyze their color, size, and volume based on the 3D model for grading. Finally, the deflation and contraction of the driven air roller causes the strawberries to fall through the gap between the driven air roller and the threaded conveying roller into the corresponding grading collection bin below, achieving graded storage of the strawberries. This invention first removes defective products by acquiring dimensional images, eliminating obviously substandard products, reducing the amount of data processing during quality grading, and accelerating grading efficiency. The diverting plate and guide pusher work together to orderly guide the strawberries to the preset track, thereby orderly acquiring images, which helps improve grading accuracy. The driven air roller and the threaded conveyor roller work together to drive the strawberries to rotate, realizing the acquisition of multi-directional image information of the strawberries. The grading basis information is more comprehensive, the grading is more accurate, and the grading quality is higher. Ultimately, it achieves efficient, low-loss, real-time screening and classification of strawberries with a high degree of automation and high grading efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the feeding device;

[0025] Figure 3 A schematic diagram of a conveying device, a dimensional image acquisition device, and a dimensional grading auxiliary device;

[0026] Figure 4 This is a schematic diagram of a size grading auxiliary device;

[0027] Figure 5 This is a schematic diagram of a quality grading device.

[0028] The diagram shows the following components: 1. Feeding device; 2. Conveying device; 3. Diverter plate; 4. Dimensional image acquisition device; 5. Computer; 6. Control panel; 7. Dimensional grading auxiliary device; 8. Quality grading device; 9. Storage bin; 10. Feeding conveyor belt; 11. Feeding partition; 12. Feeding support; 13. Feeding drive roller; 14. Feeding motor; 15. Feeding driven roller; 16. Conveying driven roller; 17. Conveying belt; 18. Conveying drive roller; 19. Conveying motor; 20. Conveying support; 21. Housing. 22. Light source; 23. High-speed industrial camera; 24. Photoelectric sensor; 25. Data cable; 26. Slide rail; 27. Guide push plate; 28. Guide motor; 29. ​​Roller; 30. Sliding sleeve; 31. Sleeve bracket; 32. Defective product collection box; 33. Non-defective product chute; 34. Quality grading bracket; 35. Motion compensation camera; 36. Driven air-filled roller; 37. Threaded conveyor roller; 38. Solenoid valve; 39. Air filling / deleting pipe; 40. Air storage tank; 41. Quality grading motor; 42. Grading collection box. Detailed Implementation

[0029] Referring to the attached diagram, the specific implementation method is as follows:

[0030] A non-destructive testing and grading device for strawberries includes a conveying device 2. The input end of the conveying device 2 is equipped with a feeding device 1, and the output end of the conveying device 2 is equipped with a quality grading device 8. The conveying device 2 is also equipped with a flow divider 3, a size image acquisition device 4, and a size grading auxiliary device 7. The conveying device 2 includes a conveying support 20. The conveying support 20 is equipped with a conveying drive roller 18 and a conveying driven roller 16. The conveying drive roller 18 and the conveying driven roller 16 are fitted with a conveyor belt 17. The conveying support 20 is also equipped with a conveying motor 19 for driving the conveying drive roller 18 to rotate.

[0031] like Figure 2 As shown, the feeding device 1 includes a storage box 9 and a feeding support 12. A feeding driven roller 15 and a feeding active roller 13 are installed on the feeding support 12. A feeding conveyor belt 10 is fitted on the feeding driven roller 15 and the feeding active roller 13. The lower end of the feeding conveyor belt 10 extends into the storage box 9, and the upper end of the feeding conveyor belt 10 is located above the input end of the conveyor belt 17. Multiple feeding partitions 11 are spaced apart on the surface of the feeding conveyor belt 10. The feeding partitions 11 are rectangular flat plates. The feeding partitions 11 are perpendicular to the length direction of the feeding conveyor belt 10, and the length direction of the feeding conveyor belt 10 is parallel to the length direction of the conveyor belt 17. When the feeding partitions 11 move to the lower end of the feeding conveyor belt 10, the feeding partitions 11 can drive the strawberries in the storage box 9 from the lower end to the upper end of the feeding conveyor belt 10, and then cause the strawberries to fall from the upper end of the feeding conveyor belt 10 to the upper surface of the input end of the conveyor belt 17.

[0032] Diverter plate 3 is located above conveyor belt 17 and close to the input end of conveyor belt 17. Diverter plate 3 has multiple inclined surfaces on the side facing the input end. The multiple inclined surfaces can guide and divert the movement direction of multiple strawberries on conveyor belt 17, so that multiple strawberries on conveyor belt 17 can move to both sides of diverter plate 3 in sequence, thereby dividing multiple strawberries into two rows and conveying them in sequence on conveyor belt 17.

[0033] Baffles (not shown in the figure) are provided on both sides of the conveyor belt 17. The baffles on both sides can prevent the strawberries from moving from both sides of the diverter plate 3 towards the edge of the conveyor belt 17, thus ensuring that multiple strawberries are divided into two rows close to the baffles on the conveyor belt 17 and do not roll off the edge of the conveyor belt 17. Whether or not baffles are provided depends on the width of the diverter plate 3 and the conveyor belt 17. When the diverter plate 3 is wider than the conveyor belt 17, baffles are usually required. When the diverter plate 3 is narrower than the conveyor belt 17, strawberries usually will not roll to the edge of the conveyor belt 17 even without baffles.

[0034] like Figure 3 As shown, the size image acquisition device 4 includes a housing 21 covering the conveyor belt 17. A light source 22 and a high-speed industrial camera 23 are provided on the inner top wall of the housing 21. A photoelectric sensor 24 is also provided on the side wall of the housing 21. The photoelectric sensor 24 can detect strawberries moving into the housing 21. The computer 5 controls the high-speed industrial camera 23 to acquire images of the strawberries inside the housing 21 based on the detection data from the photoelectric sensor 24. The computer 5 can determine the position of the strawberries on the conveyor belt 17, as well as the maximum transverse diameter and maximum length of the strawberries, based on the image data acquired by the high-speed industrial camera 23. The computer 5 classifies the strawberries as defective or non-defective based on the maximum transverse diameter and maximum length. If both the maximum transverse diameter and maximum length reach a threshold, the computer 5 classifies the strawberries as non-defective; otherwise, it classifies them as defective. In this embodiment, the computer 5 is mounted on an operating table 6 located on one side of the conveyor support 20. The photoelectric sensor 24 and the high-speed industrial camera 23 are connected to the computer 5 via data cables 25.

[0035] like Figure 3 , 4As shown, the size grading auxiliary device 7 is located between the housing 21 and the output end of the conveyor belt 17. The size grading auxiliary device 7 includes a slide rail 26 located above the conveyor belt 17. The slide rail 26 and the upper surface of the conveyor belt 17 are both horizontally arranged. The length direction of the slide rail 26 is perpendicular to the length direction of the conveyor belt 17. Two sliding sleeves 30 are sleeved on the slide rail 26. A guide motor 28 is installed on the sliding sleeve 30. A roller 29 is installed on the output shaft of the guide motor 28. The roller 29 can roll on the slide rail 26 and drive the sliding sleeve 30 to move along the slide rail 26. The bottom end of the sliding sleeve 30 is connected to a sleeve bracket 31. The bottom end of the sleeve bracket 31 is connected to a guide push plate 27. The guide push plate 27 includes two rectangular clamps arranged opposite each other. The length direction of the rectangular clamps is parallel to the length direction of the conveyor belt 17. The two rectangular clamps cooperate to form a guide channel. The length direction of the guide channel is parallel to the length direction of the conveyor belt 17.

[0036] Computer 5 can control the guide motor 28 to drive the roller 29 to rotate according to the position of the strawberry on the conveyor belt 17. This allows the guide push plate 27 to move with the sliding sleeve 30, so that the guide channel of one of the guide push plates 27 is aligned with the next strawberry transferred from the conveyor belt 17, thus allowing the strawberry to enter the guide channel. After the strawberry enters the guide channel, computer 5 can control the movement of the guide push plate 27 according to whether the strawberry is non-defective or defective, so that the guide push plate 27 changes the position of the strawberry on the conveyor belt 17 along the width direction. This allows non-defective strawberries to be sent out of the guide channel and placed in the non-defective conveying area near the two sides of the width direction of the conveyor belt 17, while defective strawberries are sent out of the guide channel and placed in the defective conveying area near the middle of the width direction of the conveyor belt 17.

[0037] The number of slide rails 26, the number of sliding sleeves 30 fitted on each slide rail 26, the dimensions of the guide push plate 27 and the guide channel along the length of the conveyor belt 17, and the spacing between two adjacent slide rails 26 along the length of the conveyor belt 17 are all set according to the speed at which the feeding device 1 conveys strawberries and the speed at which the conveyor belt 17 drives the strawberries to move. This ensures that when the feeding device 1 and the conveyor belt 17 are running continuously, all strawberries enter their respective guide channels and are pushed to their corresponding conveying areas.

[0038] like Figure 5As shown, the quality grading device 8 includes a quality grading bracket 34. A defective product collection box 32 is provided on one side of the quality grading bracket 34 near the output end of the conveyor belt 17. The opening end of the defective product collection box 32 faces the output end of the defective product conveying area, so that defective strawberries can enter the defective product collection box 32 from the defective product conveying area. Non-defective product chutes 33 are respectively opened on both sides of the defective product collection box 32. Both non-defective product chutes 33 are inclined. The length direction of the non-defective product chutes 33 is parallel to the length direction of the conveyor belt 17. The top openings of the two non-defective product chutes 33 face the output ends of the two non-defective product conveying areas, so that non-defective strawberries can enter the two non-defective product chutes 33 from the non-defective product conveying areas.

[0039] like Figure 5 As shown, two threaded conveyor rollers 37 and multiple driven air-filled rollers 36 are rotatably mounted on the quality grading bracket 34. Both the threaded conveyor rollers 37 and the driven air-filled rollers 36 are horizontally arranged, and their length directions are parallel to the length direction of the conveyor belt 17. The multiple driven air-filled rollers 36 are divided into two groups of the same number. The multiple driven air-filled rollers 36 in the same group are arranged sequentially along the axial direction and their axes coincide. The quality grading bracket 34 is provided with an air storage tank 40, which is connected to the multiple driven air-filled rollers 36 through an air filling and emptying pipe 39. The air filling and emptying pipe 39 is provided with a solenoid valve 38 that can control the multiple driven air-filled rollers 36 to fill or empty.

[0040] like Figure 5 As shown, two sets of driven air rollers 36 and two threaded conveying rollers 37 form two grading channels, which open towards the bottom of the two non-defective chutes 33. When multiple driven air rollers 36 in the same set are inflated, the strawberries fall into the gap between the driven air rollers 36 and the threaded conveying rollers 37. The width of this gap is smaller than the size of the strawberries. At this time, the grading channel can receive the strawberries sent out from the non-defective chutes 33. A quality grading motor 41 for driving the threaded conveying rollers 37 to rotate is installed on the quality grading bracket 34. The threaded conveying rollers 37 can simultaneously drive the strawberries and the driven air rollers 36 that receive the strawberries to rotate, and drive the strawberries to move along the length of the grading channel through the threaded structure on the surface of the threaded conveying rollers 37.

[0041] like Figure 5As shown, multiple open-top grading collection boxes 42 are provided below the quality grading bracket 34. The multiple grading collection boxes 42 are spaced apart along the length of the grading channel. Different grading collection boxes 42 are provided below the multiple driven air rollers 36 in the same group. Two motion compensation cameras 35 are installed on the quality grading bracket 34. The two motion compensation cameras 35 can respectively capture images of strawberries on the two grading channels. Since the strawberries on the grading channels are rotated by the threaded conveyor rollers 37, the motion compensation cameras 35 can capture multi-directional image information of the strawberry results. The computer 5 can perform three-dimensional modeling of the strawberries based on the image data captured by the motion compensation cameras 35, and analyze the size, volume, and color information of the strawberries based on the three-dimensional model, thereby grading the strawberries according to their quality.

[0042] Computer 5 can control the quality grading motor 41 to drive the threaded conveyor roller 37 to rotate according to the grading results of the strawberries, so that the strawberries move in the grading channel to the grading collection box 42 corresponding to the grading results. Computer 5 can determine that the strawberries have moved into position in the grading channel based on the image data collected by the motion compensation camera 35, and after the strawberries have moved into position, it controls the driven air roller 36 above the grading collection box 42 corresponding to the grading results to deflate and retract. At this time, the width of the gap between the driven air roller 36 and the threaded conveyor roller 37 is greater than the size of the strawberries, so that the strawberries fall from the grading channel into the corresponding grading collection box 42, realizing efficient, low-loss real-time screening and classification of strawberries with a high degree of automation and high grading efficiency.

Claims

1. A non-destructive testing and grading device for strawberries, characterized in that: The conveyor includes a conveying device (2), with a feeding device (1) at the input end and a quality grading device (8) at the output end. The conveyor also includes a diverter plate (3), a size image acquisition device (4), and a size grading auxiliary device (7). The conveyor includes a conveying support (20), with a conveying drive roller (18) and a conveying driven roller (16) installed on the conveying support (20). A conveyor belt (17) is provided on the conveying drive roller (18) and the conveying driven roller (16). A conveying motor (19) for driving the conveying drive roller (18) to rotate is also installed on the conveying support (20). The feeding device (1) includes a storage box (9) and a feeding bracket (12). The feeding bracket (12) is equipped with a feeding driven roller (15) and a feeding active roller (13). The feeding driven roller (15) and the feeding active roller (13) are equipped with a feeding conveyor belt (10). The lower end of the feeding conveyor belt (10) extends into the storage box (9), and the upper end of the feeding conveyor belt (10) is located above the input end of the conveyor belt (17). Multiple feeding partitions (11) are spaced apart on the surface of the feeding conveyor belt (10). The feeding partitions (11) can drive the strawberries in the storage box (9) to move from the lower end to the upper end of the feeding conveyor belt (10), so that the strawberries can fall from the upper end of the feeding conveyor belt (10) to the upper surface of the input end of the conveyor belt (17). The diverter plate (3) is located above the conveyor belt (17) and close to the input end of the conveyor belt (17). The diverter plate (3) has multiple inclined surfaces on the side facing the input end. The multiple inclined surfaces can guide and divert the movement direction of multiple strawberries on the conveyor belt (17) so that multiple strawberries on the conveyor belt (17) can move to both sides of the diverter plate (3) in sequence, thereby making multiple strawberries divided into two rows and conveyed in sequence on the conveyor belt (17). The size image acquisition device (4) includes a box (21) covering the conveyor belt (17). The inner wall of the top side of the box (21) is equipped with a light source (22) and a high-speed industrial camera (23). The side wall of the box (21) is also equipped with a photoelectric sensor (24). The photoelectric sensor (24) can detect the strawberries that have moved into the box (21). The computer (5) controls the high-speed industrial camera (23) to acquire images of the strawberries inside the box (21) through the detection data of the photoelectric sensor (24). The computer (5) can obtain the position of the strawberries on the conveyor belt (17) and the maximum transverse diameter and maximum length of the strawberries based on the image data acquired by the high-speed industrial camera (23). The computer (5) classifies the strawberries into defective or non-defective products based on the maximum transverse diameter and maximum length. The size grading auxiliary device (7) is located between the box (21) and the output end of the conveyor belt (17). The size grading auxiliary device (7) includes one or more slide rails (26) located above the conveyor belt (17). The upper surfaces of the slide rails (26) and the conveyor belt (17) are both horizontally arranged. The length direction of the slide rails (26) is perpendicular to the length direction of the conveyor belt (17). When there are multiple slide rails (26), they are spaced apart along the length direction of the conveyor belt (17). Multiple sliding sleeves (30) are sleeved on the slide rails (26). A guide motor (28) is installed on the sliding sleeve (30). A roller (29) is installed on the output shaft of the guide motor (28). The roller (29) can roll on the slide rail (26) and drive the sliding sleeve (30) to move along the slide rail (26). The bottom end of the sliding sleeve (30) is connected to a sleeve bracket (31). The bottom end of the sleeve bracket (31) is connected to a guide push plate (27). The guide push plate (27) has a guide channel that allows strawberries to pass through. The length direction of the guide channel is parallel to the length direction of the conveyor belt (17). The computer (5) can control the guide motor (28) to drive the roller (29) to rotate according to the position of the strawberry on the conveyor belt (17), so that the guide push plate (27) moves with the sliding sleeve (30) and the strawberry enters the guide channel. After the strawberry enters the guide channel, the computer (5) can control the guide push plate (27) to move according to whether the strawberry is non-defective or defective. This will cause non-defective strawberries to be sent out of the guide channel and located in the non-defective conveying area near the two sides of the width direction of the conveyor belt (17), and cause defective strawberries to be sent out of the guide channel and located in the defective conveying area near the middle of the width direction of the conveyor belt (17). The quality grading device (8) includes a quality grading bracket (34). A defective product collection box (32) is provided on one side of the quality grading bracket (34) near the output end of the conveyor belt (17). The opening end of the defective product collection box (32) faces the output end of the defective product conveying area, so that defective strawberries can enter the defective product collection box (32) from the defective product conveying area. Non-defective product chutes (33) are respectively opened on both sides of the defective product collection box (32). Both non-defective product chutes (33) are inclined. The top openings of the two non-defective product chutes (33) face the output ends of the two non-defective product conveying areas, so that non-defective strawberries can enter the two non-defective product chutes from the non-defective product conveying areas. The quality grading bracket (34) has two threaded conveyor rollers (37) and multiple driven air rollers (36) rotatably mounted on it. The threaded conveyor rollers (37) and the driven air rollers (36) are both horizontally arranged. The length direction of the threaded conveyor rollers (37) and the driven air rollers (36) is parallel to the length direction of the conveyor belt (17). The multiple driven air rollers (36) are divided into two groups of the same number. The multiple driven air rollers (36) in the same group are arranged sequentially along the axial direction and their axes coincide. The quality grading bracket (34) is provided with an air storage tank (40). The air storage tank (40) is connected to the multiple driven air rollers (36) respectively through an air filling and emptying pipe (39). Two sets of driven air rollers (36) and two threaded conveying rollers (37) form two grading channels respectively. The two grading channels open towards the bottom of the two non-defective chutes (33). When multiple driven air rollers (36) of the same set are inflated, the grading channels can receive strawberries sent from the non-defective chutes (33). A quality grading motor (41) for driving the threaded conveying rollers (37) to rotate is installed on the quality grading bracket (34). The threaded conveying rollers (37) can simultaneously drive the strawberries and the driven air rollers (36) that receive the strawberries to rotate, and drive the strawberries to move along the length of the grading channels through the threaded structure on the surface of the threaded conveying rollers (37). Below the quality grading bracket (34) are multiple open-top grading collection boxes (42), which are spaced apart along the length of the grading channel. Below the multiple driven air rollers (36) in the same group are different grading collection boxes (42). Two motion compensation cameras (35) are installed on the quality grading bracket (34). The two motion compensation cameras (35) can respectively acquire images of strawberries on the two grading channels. The computer (5) can perform three-dimensional modeling of strawberries based on the image data acquired by the motion compensation cameras (35), and perform three-dimensional modeling of strawberries based on the three-dimensional model. The strawberries are graded. The computer (5) can control the quality grading motor (41) to drive the threaded conveyor roller (37) to rotate according to the grading results of the strawberries, so that the strawberries move in the grading channel to the grading collection box (42) corresponding to the grading results. The computer (5) can determine that the strawberries have moved into position in the grading channel according to the image data collected by the motion compensation camera (35), and after the strawberries have moved into position, it controls the driven air roller (36) above the grading collection box (42) corresponding to the grading results to deflate and shrink, so that the strawberries fall from the grading channel into the corresponding grading collection box (42).

2. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: The feeding partition (11) is a rectangular flat plate, and the length direction of the feeding partition (11) is perpendicular to that of the feeding conveyor belt (10).

3. The strawberry non-destructive testing and grading device according to claim 2, characterized in that: The length direction of the feeding conveyor belt (10) is parallel to the length direction of the conveyor belt (17).

4. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: Baffles are provided on both sides of the conveyor belt (17). The baffles on both sides can block the movement of strawberries from both sides of the diverter plate (3) toward the edge of the conveyor belt (17), so that multiple strawberries can be divided into two rows close to the baffles on both sides of the conveyor belt (17).

5. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: When both the maximum transverse diameter and the maximum length reach the threshold, the computer (5) classifies the strawberries as non-defective; otherwise, it classifies them as defective.

6. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: The guide plate (27) includes two rectangular clamps arranged opposite each other. The length direction of the rectangular clamps is parallel to the length direction of the conveyor belt (17), and the two rectangular clamps cooperate to form a guide channel.

7. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: The size grading auxiliary device (7) includes a slide rail (26) on which two sliding sleeves (30) are fitted.

8. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: The computer (5) is set on the operating table (6) located on one side of the conveyor support (20), and the photoelectric sensor (24) and the high-speed industrial camera (23) are connected to the computer (5) via data cables (25).

9. The strawberry non-destructive testing and grading device according to claim 1, characterized in that: The length direction of the non-defective chute (33) is parallel to the length direction of the conveyor belt (17).

10. A strawberry non-destructive testing and grading device according to claim 1, characterized in that: The inflation / deflation pipe (39) is equipped with a solenoid valve (38) that can control multiple driven inflation rollers (36) to inflate or deflate.

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