Kiwi fruit sugar degree grading device and grading method based on near infrared spectrum

Abstract

The invention relates to the technical field of kiwi fruit grading, and discloses a kiwi fruit sugar degree grading device and method based on near infrared spectrums.The kiwi fruit sugar degree grading device comprises a bottom plate, three fruit bodies are arranged above the bottom plate, a light leakage preventing mechanism and a driving mechanism are arranged above the bottom plate, and a grading mechanism is arranged below the bottom plate; the light leakage prevention mechanism comprises a near-infrared spectrometer, the detection end of the near-infrared spectrometer is fixedly connected with a fixing cylinder, and the outer surface of the fixing cylinder is fixedly connected with two fixing plates. According to the kiwi fruit sugar degree grading device based on the near-infrared spectrum and the grading method, a gap between the fixing barrel and kiwi fruits can be closed, near-infrared light irradiated on the kiwi fruits by a near-infrared spectrometer is prevented from being excessively diffused outwards, and the kiwi fruit sugar degree grading effect is achieved while kiwi fruit bodies are not crushed. The near-infrared spectrometer can adapt to sugar degree detection work of kiwi fruit bodies with different sizes, and the problem that due to the fact that the sizes of the kiwi fruit bodies are different, light leakage is different, and the sugar degree grading detection precision is poor is avoided.

Description

Technical Field

[0001] This invention relates to the field of kiwifruit grading technology, specifically to a kiwifruit sugar content grading device and grading method based on near-infrared spectroscopy. Background Technology

[0002] Kiwifruit, also known as Yangtao, is a large deciduous vine belonging to the genus Actinidia in the family Actinidiaceae. Kiwifruit has a soft texture, a unique sweet and sour flavor, and is rich in vitamin C, carotene, and amino acids—essential nutrients for the human body. After harvesting, to differentiate between kiwifruit with varying sugar levels and remove unripe ones, kiwifruit needs to be graded based on sugar content. To increase the efficiency of sugar content analysis without damaging the kiwifruit, near-infrared spectroscopy is typically used. This technique utilizes the different spectra reflected by kiwifruit with varying sugar levels to perform sugar content grading.

[0003] Existing near-infrared spectroscopy-based kiwifruit sugar content grading devices cannot accurately adapt to the size of kiwifruit, causing light leakage due to gaps between the near-infrared spectrometer and the kiwifruit, thus affecting the accuracy of sugar content grading. Summary of the Invention

[0004] The purpose of this invention is to provide a kiwifruit sugar content grading device and grading method based on near-infrared spectroscopy, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A kiwifruit sugar content grading device based on near-infrared spectroscopy includes a base plate, three fruits are placed on the top of the base plate, two drive mechanisms are symmetrically arranged on the top of the base plate, and the fruits are located between and in contact with the two drive mechanisms. A light-proof mechanism is provided on the top of the base plate, and the light-proof mechanism spans the base plate and is located directly above the fruits. A grading mechanism is provided below the base plate. The light leakage prevention mechanism includes a near-infrared spectrometer. A fixed cylinder is fixedly connected to the detection end of the near-infrared spectrometer. Two fixed plates are fixedly connected to the outer surface of the fixed cylinder. A first electric push rod is fixedly connected to the bottom surface of each of the two fixed plates. The telescopic ends of the two first electric push rods are fixedly connected to a movable frame. A rubber cylinder is fixedly connected to the bottom surface of the movable frame. A rubber ring is fixedly connected to the bottom surface of the rubber cylinder. The movable frame, the rubber cylinder, and the rubber ring are all slidably connected to the outside of the fixed cylinder. Several return springs are fixedly connected to the upper surface of the rubber ring. The top end of each return spring is fixedly connected to the bottom surface of the movable frame.

[0006] Furthermore, the outer surface of the near-infrared spectrometer is fixedly connected to two mounting brackets, the bottom surfaces of which are fixedly connected to the upper surface of the base plate.

[0007] Furthermore, each return spring is equipped with a sliding rod inside, each sliding rod is slidably connected inside the movable frame, and the bottom end of each sliding rod is fixedly connected to the upper surface of the rubber ring.

[0008] Furthermore, the drive mechanism includes four rotating columns, which are rectangularly distributed on the base plate. A rubber conveyor belt is fitted between the outer surfaces of two rotating columns distributed along the length direction. Buffer grooves are provided inside the two rubber conveyor belts. Two shields are fixedly connected to the bottom surface of the base plate. Rotating rods are rotatably connected inside the two shields. A first bevel gear is fixedly connected to the bottom end of each rotating column. Two second bevel gears are fixedly connected to the outer surfaces of the two rotating rods. Each second bevel gear meshes with a first bevel gear. A third bevel gear is fixedly connected to one end of each rotating rod. A fourth bevel gear meshes with the outer surfaces of the two third bevel gears. A connecting rod is fixedly connected to the inner walls of the two fourth bevel gears. A servo motor is fixedly connected to one side of one of the shields. The output end of the servo motor is fixedly connected to one end of the connecting rod. An infrared generator and an infrared receiver are fixedly connected to the upper surface of the base plate. The infrared receiver is electrically connected to the servo motor via wires.

[0009] Furthermore, two limiting rings are fixedly connected to the outer surface of each rotating column, and one side of each limiting ring is in contact with the outer surface of the rubber conveyor belt.

[0010] Furthermore, two positioning plates are rotatably connected to the outer surfaces of the two rotating rods, and the outer surface of each positioning plate is fixedly connected to the inner wall of the shield; a protective cover is fixedly connected to one side of the two shields, and the connecting rod is rotatably connected inside the protective cover.

[0011] Furthermore, guide plates are provided on one side of both rubber conveyor belts, and the bottom surfaces of both guide plates are fixedly connected to the upper surface of the base plate. Both guide plates are inclined, and four support legs are fixedly connected to the outer surface of the base plate.

[0012] Furthermore, the grading mechanism includes a silicone cylinder, the upper surface of which is fixedly connected to the bottom surface of the base plate. The upper surface of the base plate has a discharge port located above the silicone cylinder. A connecting ring is fixedly connected to the bottom end of the silicone cylinder, and a connecting frame is fixedly connected to the outer surface of the connecting ring. One side of the connecting frame is fixedly connected to the outer surface of the connecting ring. Three grading baskets are provided below the base plate.

[0013] Furthermore, a limit cover is fixedly connected to the upper surface of the base plate, and the limit cover is positioned above the discharge port; a stabilizing seat is fixedly connected to the outer surface of the second electric push rod, and the upper surface of the stabilizing seat is fixedly connected to the bottom surface of the base plate.

[0014] A grading method for kiwifruit sugar content based on near-infrared spectroscopy includes the following steps: S1. Place the kiwi fruit on the base plate and move it to the detection position below the near-infrared spectrometer through the drive mechanism; when the kiwi fruit moves to block the infrared light emitted by the infrared generator, the infrared receiver will not receive the infrared light and will generate an electrical signal to control the drive mechanism to stop running. S2. The infrared receiver simultaneously controls the first electric push rod to start, pushing the movable frame to move downwards, causing the rubber cylinder and rubber ring to come into contact with the surface of the kiwi fruit. The elasticity of the return spring adapts to different sizes of fruit, forming a closed detection space to prevent near-infrared light leakage. S3. The near-infrared spectrometer detects the sugar content of the kiwifruit. After the detection is completed, the first electric push rod is reset and the drive mechanism is restarted to transport the fruit to the discharge port. The near-infrared spectrometer, in conjunction with the external controller, controls the second electric push rod to move the connecting ring and the lower end of the silicone tube to the grading basket above the corresponding sugar content level, so that the kiwifruit falls into the corresponding grading basket through the discharge port, thus completing the grading.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: First, this invention, by setting up a light-leakage prevention mechanism in conjunction with a drive mechanism, can move the kiwi fruit to a position below the near-infrared spectrometer for sugar content detection. At the same time, the up-and-down movement of the rubber cylinder, combined with the elasticity of the rubber cylinder itself and the elastic force provided by the return spring, can seal the gap between the fixing cylinder and the kiwi fruit, preventing excessive diffusion of the near-infrared light used for detection on the kiwi fruit by the near-infrared spectrometer. This allows the near-infrared spectrometer to adapt to sugar content detection of kiwi fruit of different sizes without damaging the kiwi fruit, avoiding the problem of different light leakage due to different fruit sizes, which leads to poor accuracy in sugar content grading detection.

[0016] Secondly, by setting up a grading mechanism, this invention can work in conjunction with a driving mechanism and a light-leakage prevention mechanism to divide the kiwifruit into three grades according to their sugar content after the sugar content test is completed. The three grades of kiwifruit are then guided to three grading baskets for temporary storage, thus ensuring the smooth progress of the near-infrared spectral sugar content grading of kiwifruit. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a three-dimensional structural schematic diagram of the near-infrared spectrometer of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the fixed cylinder and rubber cylinder of the present invention in cross-section; Figure 4This is a three-dimensional structural diagram of the grading basket and bottom plate of the present invention; Figure 5 This is a three-dimensional structural diagram of the rotating column and the shielding cover of the present invention; Figure 6 This is a three-dimensional structural diagram of the rotating rod and connecting rod of the present invention; Figure 7 This is a three-dimensional structural diagram of the limiting cover and the base plate of the present invention; Figure 8 This is a three-dimensional structural diagram of the silicone tube and connecting ring of the present invention.

[0018] The components include: 1. Base plate; 2. Light leakage prevention mechanism; 201. Near-infrared spectrometer; 202. Fixed cylinder; 203. Fixed plate; 204. First electric push rod; 205. Movable frame; 206. Rubber cylinder; 207. Rubber ring; 208. Return spring; 209. Fixed frame; 210. Sliding rod; 3. Drive mechanism; 301. Rotating column; 302. Rubber conveyor belt; 303. Buffer groove; 304. Shield; 305. Rotating rod; 306. First bevel gear; 307. Second bevel gear; 30 8. Third bevel gear; 309. Fourth bevel gear; 310. Connecting rod; 311. Servo motor; 312. Limiting ring; 313. Positioning plate; 314. Protective cover; 315. Guide plate; 316. Support leg; 317. Infrared generator; 318. Infrared receiver; 4. Grading mechanism; 401. Silicone cylinder; 402. Discharge port; 403. Connecting ring; 404. Second electric push rod; 405. Connecting frame; 406. Grading basket; 407. Limiting cover; 408. Stabilizing seat; 5. Fruit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 Please see Figure 1-3 A kiwifruit sugar content grading device based on near-infrared spectroscopy includes a base plate 1, three fruit pieces 5 placed on top of the base plate 1, a light-blocking mechanism 2 and two driving mechanisms 3 respectively arranged on top of the base plate 1, with the light-blocking mechanism 2 spanning across the base plate 1 and located directly above the fruit pieces 5, the two driving mechanisms 3 symmetrically arranged on the base plate 1, and the three fruit pieces 5 located between and in contact with the two driving mechanisms 3, and a grading mechanism 4 arranged below the base plate 1.

[0022] The light leakage prevention mechanism 2 includes a near-infrared spectrometer 201. A fixed cylinder 202 is fixedly connected to the detection end of the near-infrared spectrometer 201. Two fixed plates 203 are symmetrically arranged on the outer surface of the fixed cylinder 202. A first electric push rod 204 is fixedly connected to the bottom surface of each of the two fixed plates 203. A movable frame 205 is fixedly connected to the telescopic ends of the two first electric push rods 204. A stretchable or compressible rubber cylinder 206 is fixedly connected to the bottom surface of the movable frame 205. A rubber ring 207 is fixedly connected to the bottom surface of the rubber cylinder 206. The movable frame 205, rubber cylinder 206, and rubber ring 207 are all slidably connected to the outer surface of the fixed cylinder 202. Several return springs 208, evenly distributed around the circumference of the rubber cylinder 206, are fixedly connected to the upper surface of the rubber ring 207. The top end of each return spring 208 is fixedly connected to the bottom surface of the movable frame 205.

[0023] Two mounting brackets 209 are fixedly connected to the outer surface of the near-infrared spectrometer 201, and the two mounting brackets 209 are symmetrically arranged. The bottom surface of both mounting brackets 209 is fixedly connected to the upper surface of the base plate 1. The mounting brackets 209 can fix the near-infrared spectrometer 201, so that the near-infrared spectrometer 201 and the base plate 1 are kept at a suitable distance, ensuring the smooth operation of the near-infrared spectrometer 201 in detecting the sugar content of kiwifruit fruit 5.

[0024] Each return spring 208 has a sliding rod 210 inside. The top end of each sliding rod 210 is slidably connected to the movable frame 205, and the bottom end of each sliding rod 210 is fixedly connected to the upper surface of the rubber ring 207. The sliding rod 210 can prevent the return spring 208 from being excessively twisted without affecting the extension and retraction of the return spring 208, and at the same time prevent the rubber cylinder 206 from being deviated, thereby improving the stability of the return spring 208 and the rubber cylinder 206.

[0025] The specific implementation method of this embodiment is as follows: In use, firstly, the near-infrared spectrometer 201 and the first electric push rod 204 are connected to an external power supply and a controller. When it is necessary to grade the sugar content of the kiwi fruit 5, the kiwi fruit 5 is first placed on the base plate 1. When the kiwi fruit 5 is located below the near-infrared spectrometer 201, the power provided by the first electric push rod 204, in conjunction with the fixed plate 203 and the fixed cylinder 202, pushes the movable frame 205 to slide outside the fixed cylinder 202, which can drive the rubber cylinder 206 and the rubber ring 207 to move downwards until the rubber ring 207 contacts the kiwi fruit 5. At this time, the rubber ring 207 is used to make the kiwi fruit 5 more hydrated. The elasticity of the cylinder 206 and the rubber ring 207, along with the contraction of the return spring 208, can cover kiwifruit bodies 5 of different sizes. At the same time, the deformation of the rubber ring 207 makes it fit the detection surface of the kiwifruit body 5 more closely, thereby preventing excessive leakage of near-infrared detection light emitted downwards by the near-infrared spectrometer 201 through the fixed cylinder 202 from the gap. Thus, without damaging the kiwifruit body 5, the near-infrared spectrometer 201 can adapt to the sugar content detection of kiwifruit bodies 5 of different sizes, avoiding poor sugar content grading accuracy due to different light leakage caused by different sizes of kiwifruit bodies 5.

[0026] Please see Figure 4-7 The drive mechanism 3 includes four rotating columns 301, which are rectangularly distributed on the base plate 1. A rubber conveyor belt 302 is fitted between the outer surfaces of two rotating columns 301 distributed along the length direction. The rubber conveyor belt 302 has several evenly distributed circumferential buffer grooves 303 inside. The bottom end of each rotating column 301 passes through the base plate 1 and is rotatably connected to the base plate 1. A first bevel gear 306 is fixedly connected to the bottom end of each rotating column 301. Two symmetrically arranged shields 304 are fixedly connected to the bottom surface of the base plate 1 along the length direction. Rotating rods 305 are rotatably connected inside the two shields 304. Two second bevel gears 307 are fixedly connected to each rotating rod 305. Each second bevel gear 307 meshes with the first bevel gear 306. A third bevel gear 308 is fixedly connected to one end of each of the two rotating rods 305. The surface of each part is meshed with a fourth bevel gear 309. Two fourth bevel gears 309 are symmetrically arranged on the connecting rod 310. A servo motor 311 is fixedly connected to one side of one of the shields 304. The output end of the servo motor 311 is fixedly connected to one end of the connecting rod 310. An infrared generator 317 and an infrared receiver 318 are fixedly connected to the upper surface of the base plate 1, and the infrared generator 317 and the infrared receiver 318 are symmetrically arranged with respect to the fruit body 5. The infrared receiver 318 is electrically connected to the servo motor 311 and the two first electric push rods 204 through wires. The bottom end of the rotating column 301 is located inside the shield 304.

[0027] Each rotating column 301 has a limiting ring 312 fixedly connected to both its upper and lower ends. One side of each limiting ring 312 is in contact with the outer surface of the rubber conveyor belt 302. The limiting ring 312 can restrict the position of the rubber conveyor belt 302 on the rotating column 301 and prevent the rubber conveyor belt 302 from becoming loose from the rotating column 301.

[0028] Two positioning plates 313 are rotatably connected to the outer surface of the rotating rod 305. The outer surface of each positioning plate 313 is fixedly connected to the inner wall of the shield 304. The positioning plates 313 can accurately position the rotating rod 305 inside the shield 304, making the rotating rod 305 more precise and reliable in use.

[0029] The two shields 304 are fixedly connected to a protective cover 314 on one side. The connecting rod 310 is rotatably connected inside the protective cover 314. The protective cover 314 can increase the rotational stability of the connecting rod 310 and improve the reliability of the power transmission of the connecting rod 310.

[0030] Guide plates 315 are provided on one side of each of the two rubber conveyor belts 302. The bottom surfaces of the two guide plates 315 are fixedly connected to the upper surface of the base plate 1. The two guide plates 315 are inclined. Four support legs 316 are fixedly connected to the bottom surface of the base plate 1. The guide plates 315 make it convenient for workers to place kiwis that need to be graded for sugar content on the base plate 1. The support legs 316 can support and increase the stability of the device.

[0031] The specific implementation of this embodiment is as follows: The servo motor 311 provides power to connect the connecting rod 310 and the fourth bevel gear 309, which in turn drives the two third bevel gears 308 to rotate in opposite directions. This, in turn, drives the two rotating rods 305 to rotate in opposite directions with the assistance of the shield 304. At this time, the meshing of the second bevel gear 307 and the first bevel gear 306 with the rotating column 301 drives the two rubber conveyor belts 302 to rotate simultaneously in opposite directions. The two rubber conveyor belts 302 are in contact with the kiwi fruit 5 and are located between the two rubber conveyor belts 302. The friction between the rubber conveyor belts 302 and the side of the fruit 5 drives the fruit to move, thereby moving the kiwi fruit 5 from left to right to below the rubber cylinder 206. The rubber conveyor belts 302 themselves are made of rubber, possessing elasticity and a high coefficient of friction, providing sufficient friction without harshly scratching the fruit peel. The buffer groove 303 further increases the elasticity of the contact surface between the rubber conveyor belt 302 and the kiwi fruit 5, allowing kiwi fruit 5 of different sizes to be moved without being damaged. When the kiwi fruit 5 moves to below the rubber cylinder 206, it blocks the infrared light emitted by the infrared generator 317, preventing the infrared receiver 318 from receiving the infrared light. Consequently, the infrared receiver 318 generates an electrical signal, which controls the servo motor 311 to stop working via a wire. At the same time, the first electric push rod 204 starts working, ensuring that the kiwi fruit 5 remains stationary during the sugar content grading test, allowing the sugar content grading test to proceed smoothly. After the near-infrared spectrometer 201 completes the test, the first electric push rod 204 can be reset via an external controller and wires, while the servo motor 311 continues to rotate to perform the next sugar content grading test on the kiwi fruit 5.

[0032] Please see Figure 7 and Figure 8 The grading mechanism 4 includes a silicone cylinder 401, the upper surface of which is fixedly connected to the bottom surface of the base plate 1. The upper surface of the base plate 1 is provided with a discharge port 402, which is located above the silicone cylinder 401. A connecting ring 403 is fixedly connected to the bottom end of the silicone cylinder 401. A connecting frame 405 is fixedly connected to the outer surface of the connecting ring 403. The connecting frame 405 is fixedly connected to the telescopic end of the second electric push rod 404. The second electric push rod 404 is electrically connected to the near-infrared spectrometer 201 through a wire. Three grading baskets 406 are provided below the base plate 1.

[0033] A limiting cover 407 is fixedly connected to the upper surface of the base plate 1. The limiting cover 407 is set above the discharge port 402. The limiting cover 407 can ensure that the kiwi fruit 5 after the sugar content test is completed can smoothly enter the discharge port 402, and prevent the kiwi fruit 5 from rolling down and being damaged.

[0034] The second electric push rod 404 is fixedly connected to a stabilizing base 408. The upper surface of the stabilizing base 408 is fixedly connected to the bottom surface of the base plate 1 and is located on one side of the silicone barrel 401. The stabilizing base 408 can increase the stability of the second electric push rod 404 and ensure that the second electric push rod 404 can drive the connecting frame 405 to move.

[0035] The specific implementation method of this embodiment is as follows: After the near-infrared spectrometer 201 detects the sugar content level of the kiwi fruit 5, the near-infrared spectrometer 201, in conjunction with the external controller, controls the second electric push rod 404 to start working. The power of the second electric push rod 404, in conjunction with the stabilizing seat 408 and the connecting frame 405, pushes the connecting ring 403 to move above the grading basket 406 of the corresponding sugar content level. At this time, the kiwi fruit 5, whose sugar content grading has been completed, is moved from left to right by the rubber conveyor belt 302 from below the rubber cylinder 206 to below the discharge port 402. The kiwi fruit 5 can fall into the silicone cylinder 401 through the discharge port 402. Due to the elasticity of the silicone cylinder 401, the connecting ring 403 can move smoothly while the discharge port 402 remains connected to the connecting ring 403. Thus, the kiwi fruit 5 can fall into the corresponding grading basket 406 under the guidance of the silicone cylinder 401 and the connecting ring 403, ensuring the smooth progress of the sugar content grading of the kiwi fruit 5.

[0036] A grading method for kiwifruit sugar content based on near-infrared spectroscopy includes the following steps: S1: In use, first connect the near-infrared spectrometer 201, the first electric push rod 204, the servo motor 311, the infrared generator 317, the infrared receiver 318, and the second electric push rod 404 to the external power supply and controller. When it is necessary to grade the sugar content of the kiwi fruit 5, first place the kiwi fruit 5 on the base plate 1. The power provided by the servo motor 311, in conjunction with the connecting rod 310 and the fourth bevel gear 309, can drive the two third bevel gears 308 to rotate in opposite directions. This, in turn, can drive the two rotating rods 305 to rotate in opposite directions with the assistance of the shield 304. At this time, the meshing of the second bevel gear 307 and the first bevel gear 306 with the rotating column 301 can drive the two rubber conveyor belts. Simultaneously, 302 rotates in the opposite direction, thereby moving the kiwi fruit 5 from left to right to below the rubber cylinder 206. The buffer groove 303 further increases the elasticity of the contact surface between the rubber conveyor belt 302 and the kiwi fruit 5, allowing kiwi fruit 5 of different sizes to be moved without being damaged. When the kiwi fruit 5 moves to below the rubber cylinder 206, it can block the infrared light emitted by the infrared generator 317, preventing the infrared receiver 318 from receiving the infrared light. The infrared receiver 318 then generates an electrical signal, which controls the servo motor 311 to stop working through the wire, ensuring that the kiwi fruit 5 remains stationary during the sugar content grading test, thus allowing the sugar content grading test to proceed smoothly. S2: Simultaneously, the first electric push rod 204 can also receive the electrical signal from the infrared receiver 318 and start working. The power provided by the first electric push rod 204, together with the fixed plate 203 and the fixed cylinder 202, pushes the movable frame 205 to slide outside the fixed cylinder 202, which can drive the rubber cylinder 206 and the rubber ring 207 to move downward until the rubber ring 207 contacts the kiwi fruit 5. At this time, by utilizing the elasticity of the rubber cylinder 206 and the rubber ring 207 themselves and the contraction of the return spring 208, it can cover kiwi fruit 5 of different sizes. At the same time, the deformation of the rubber ring 207 makes the rubber ring 207 fit the kiwi fruit more closely. The near-infrared spectrometer 201 detects the sugar content of kiwifruit 5 by using a fixed cylinder 202 to prevent excessive leakage of near-infrared detection light emitted downwards through the cylinder. This allows the near-infrared spectrometer 201 to adapt to sugar content detection of kiwifruit 5 of different sizes without damaging the fruit. It also avoids poor sugar content grading accuracy due to different light leakage caused by different sizes of kiwifruit 5. After the near-infrared spectrometer 201 completes the detection, the first electric push rod 204 can be reset by an external controller and wires, while the servo motor 311 continues to rotate to perform the sugar content grading detection of the next kiwifruit 5. S3: After the near-infrared spectrometer 201 detects the sugar content level of the kiwi fruit 5, the near-infrared spectrometer 201, in conjunction with the external controller, controls the second electric push rod 404 to start working. The power of the second electric push rod 404, in conjunction with the stabilizing seat 408 and the connecting frame 405, pushes the connecting ring 403 to move above the grading basket 406 of the corresponding sugar content level. At this time, the kiwi fruit 5, whose sugar content grading has been completed, is moved from left to right by the rubber conveyor belt 302 from below the rubber cylinder 206 to below the discharge port 402. The kiwi fruit 5 can fall into the silicone cylinder 401 through the discharge port 402. Due to the elasticity of the silicone cylinder 401, the connecting ring 403 can move smoothly while the discharge port 402 remains connected to the connecting ring 403. Thus, the kiwi fruit 5 can fall into the corresponding grading basket 406 under the guidance of the silicone cylinder 401 and the connecting ring 403, ensuring the smooth progress of the sugar content grading of the kiwi fruit 5.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are 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 kiwifruit sugar content grading device based on near-infrared spectroscopy, comprising a base plate (1), characterized in that: Three fruits (5) are placed on the top of the base plate (1). Two drive mechanisms (3) are symmetrically arranged on the top of the base plate (1), and the fruits (5) are located between the two drive mechanisms (3) and in contact with the two drive mechanisms (3). A light-proof mechanism (2) is provided on the top of the base plate (1), and the light-proof mechanism (2) spans across the base plate (1) and is located directly above the fruits (5). A grading mechanism (4) is provided below the base plate (1). The light leakage prevention mechanism (2) includes a near-infrared spectrometer (201). The detection end of the near-infrared spectrometer (201) is fixedly connected to a fixed cylinder (202). Two fixed plates (203) are fixedly connected to the outer surface of the fixed cylinder (202). The bottom surfaces of the two fixed plates (203) are fixedly connected to a first electric push rod (204). The telescopic ends of the two first electric push rods (204) are fixedly connected to a movable frame (205). The bottom surface of the movable frame (205) is fixedly connected to a rubber cylinder (206). The bottom surface of the rubber cylinder (206) is fixedly connected to a rubber ring (207). The movable frame (205), the rubber cylinder (206) and the rubber ring (207) are all slidably connected to the outside of the fixed cylinder (202). Several return springs (208) are fixedly connected to the upper surface of the rubber ring (207). The top end of each return spring (208) is fixedly connected to the bottom surface of the movable frame (205).

2. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 1, characterized in that: Two mounting brackets (209) are fixedly connected to the outer surface of the near-infrared spectrometer (201), and the bottom surfaces of the two mounting brackets (209) are fixedly connected to the upper surface of the base plate (1).

3. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 1, characterized in that: Each return spring (208) has a sliding rod (210) inside, and each sliding rod (210) is slidably connected inside the movable frame (205). The bottom end of each sliding rod (210) is fixedly connected to the upper surface of the rubber ring (207).

4. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 1, characterized in that: The drive mechanism (3) includes four rotating columns (301), which are rectangularly distributed on the base plate (1). A rubber conveyor belt (302) is fitted between the outer surfaces of two rotating columns (301) distributed along the length direction. A buffer groove (303) is opened inside the two rubber conveyor belts (302). Two shields (304) are fixedly connected to the bottom surface of the base plate (1). A rotating rod (305) is rotatably connected inside the two shields (304). A first bevel gear (306) is fixedly connected to the bottom end of each rotating column (301). Two second bevel gears (307) are fixedly connected to the outer surfaces of the two rotating rods (305). Each second bevel gear (307) The first bevel gear (306) is meshed with the second bevel gear (308). The two rotating rods (305) are fixedly connected to one end of the third bevel gear (308). The outer surfaces of the two third bevel gears (308) are meshed with the fourth bevel gear (309). The inner walls of the two fourth bevel gears (309) are fixedly connected to the connecting rod (310). One side of one of the shields (304) is fixedly connected to the servo motor (311). The output end of the servo motor (311) is fixedly connected to one end of the connecting rod (310). The upper surface of the base plate (1) is fixedly connected to the infrared generator (317) and the infrared receiver (318). The infrared receiver (318) is electrically connected to the servo motor (311) through a wire.

5. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 4, characterized in that: Two limiting rings (312) are fixedly connected to the outer surface of each rotating column (301), and one side of each limiting ring (312) is in contact with the outer surface of the rubber conveyor belt (302).

6. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 5, characterized in that: Two positioning plates (313) are rotatably connected to the outer surfaces of the two rotating rods (305), and the outer surface of each positioning plate (313) is fixedly connected to the inner wall of the shield (304); a protective cover (314) is fixedly connected to one side of the two shields (304), and the connecting rod (310) is rotatably connected to the inside of the protective cover (314).

7. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 4, characterized in that: Guide plates (315) are provided on one side of both rubber conveyor belts (302). The bottom surfaces of both guide plates (315) are fixedly connected to the upper surface of the base plate (1). Both guide plates (315) are inclined. Four support legs (316) are fixedly connected to the outer surface of the base plate (1).

8. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 1, characterized in that: The grading mechanism (4) includes a silicone cylinder (401), the upper surface of which is fixedly connected to the bottom surface of the base plate (1), and the upper surface of the base plate (1) is provided with a discharge port (402). The discharge port (402) is located above the silicone cylinder (401). A connecting ring (403) is fixedly connected to the bottom end of the silicone cylinder (401). A connecting frame (405) is fixedly connected to the outer surface of the connecting ring (403). The connecting frame (405) is fixedly connected to the telescopic end of the second electric push rod (404). The second electric push rod (404) is electrically connected to the near-infrared spectrometer (201) through a wire. Three grading baskets (406) are provided below the base plate (1).

9. The kiwifruit sugar content grading device based on near-infrared spectroscopy according to claim 8, characterized in that: A limit cover (407) is fixedly connected to the upper surface of the base plate (1), and the limit cover (407) is located above the discharge port (402); a stabilizing seat (408) is fixedly connected to the outer surface of the second electric push rod (404), and the upper surface of the stabilizing seat (408) is fixedly connected to the bottom surface of the base plate (1).

10. The grading method of the kiwifruit sugar content grading device based on near-infrared spectroscopy according to any one of claims 1-9, characterized in that: Specifically, the following steps are included: S1. Place the kiwi fruit (5) on the base plate (1) and drive it to the detection position below the near-infrared spectrometer (201) through the drive mechanism (3); when the kiwi fruit (5) moves to block the infrared light emitted by the infrared generator (317), the infrared receiver (318) cannot receive the infrared light and generates an electrical signal, controlling the drive mechanism (3) to stop running. S2. The infrared receiver (318) simultaneously controls the first electric push rod (204) to start, pushing the movable frame (205) to move downward, causing the rubber cylinder (206) and rubber ring (207) to adhere downward to the surface of the kiwi fruit (5), and adapting to different sizes of fruit through the elasticity of the reset spring (208) to form a closed detection space to avoid near-infrared light leakage. S3. The near-infrared spectrometer (201) detects the sugar content of the kiwi fruit (5). After the detection is completed, the first electric push rod (204) is reset and the drive mechanism (3) is restarted to transport the fruit to the discharge port (402). The near-infrared spectrometer (201) and the external controller control the second electric push rod (404) to move the connecting ring (403) and the lower end of the silicone tube (401) to the grading basket (406) above the corresponding sugar content level, so that the kiwi fruit (5) falls into the corresponding grading basket (406) through the discharge port (402) to complete the grading.

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