A near-infrared spectrum-based three-plum brix sorting device and a control method thereof

Abstract

The application discloses a kind of based on near infrared spectrum's three huahua sugar content sorting device and control method thereof, it is related to fruit sugar content detection technical field, its device includes spectral acquisition device and fruit sorting device, spectral acquisition device is fixed at the top of fruit sorting device;The application acquires the spectral information of three huahua fruit by spectral acquisition device, and based on the spectral information collected, adopt the control strategy of combining near infrared spectrum technology and single-chip microcomputer, the rotation of first baffle and second baffle is controlled by controlling first motor and second motor, the sugar content sorting control of three huahua fruit is completed, can realize automatic sorting, realize fast, non-destructive, efficient analysis and identification, and reduce human intervention, guarantee the stability of sorting effect, compared with traditional sorting equipment, cost is lower, can improve production efficiency, and the structure of this technology is relatively simple, does not need complex mechanical structure and control system, easy to install and maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fruit sugar content detection, and particularly relates to a three-plum sugar content sorting device based on near-infrared spectroscopy and a control method thereof. BACKGROUND

[0002] Plums belong to the plant of the genus Prunus in the Rosaceae family, and are known for their juicy and delicious fruits. The fruits of plums are usually round or oval in shape, with colors ranging from yellow to deep red, and the flesh is yellow or light green. Three-plum is a kind of plum, belonging to the subfamily of Prunus in the Rosaceae family. It is a deciduous woody plant with single leaves, and the leaf base often has glands. Three-plum is loved by consumers because of its large fruit size, delicious flavor and high quality.

[0003] In the production process of three-plum, sugar content sorting is to ensure that consumers can obtain products with consistent taste. Sugar content is an important indicator of fruit sweetness. For three-plum, which is known for its sweetness, the level of sugar content directly affects the eating experience of consumers. Through corresponding sugar content sorting equipment, three-plums with similar sugar content can be classified into one category. This way, different sugar content levels can be priced when selling to meet the needs of different consumers.

[0004] Traditional sugar content sorting equipment for plums and other fruits is mostly complex in structure, difficult to install and maintain, and usually requires a large amount of manpower and time, making it difficult to meet the needs of large-scale production. Moreover, it is easily affected by human factors, resulting in unstable sorting results and low sorting accuracy for three-plum sugar content. At the same time, the cost of equipment and sorting is also relatively high, which cannot bring good economic benefits. Therefore, the present application proposes a three-plum sugar content sorting device based on near-infrared spectroscopy and a control method thereof to solve the problems existing in the prior art. SUMMARY

[0005] To solve the above problems, the present application proposes a three-plum sugar content sorting device based on near-infrared spectroscopy and a control method thereof, which solves the problem of traditional sugar content sorting equipment for plums and other fruits being complex in structure, requiring a large amount of manpower and time, and being difficult to meet the needs of large-scale production, and being easily affected by human factors, resulting in unstable sorting results.

[0006] In order to achieve the purpose of the present application, the present application realizes the following technical scheme: a three-plum sugar content sorting device based on near-infrared spectroscopy, comprising a spectrum acquisition device and a fruit sorting device, the spectrum acquisition device is fixed at the top end of the fruit sorting device, the spectrum acquisition device comprises a detection box and a photoelectric switch fixed symmetrically on the inner walls of both sides of the detection box, the detection box is square in shape and has a communication opening between the upper and lower parts, the other two inner walls of the detection box, which are not provided with photoelectric switches, are respectively provided with a light source port and a fiber port that are mutually adapted;

[0007] The fruit sorting device comprises a first sorting box fixed to the bottom end of the detection frame and communicated with the detection frame, and a first motor fixed to the outer wall of the first sorting box, the output shaft of the first motor penetrates into the first sorting box through a bearing and is fixed with a first baffle, the bottom end of the first sorting box is fixed with a second sorting box communicated with the first sorting box, the outer wall of the second sorting box is fixed with a second motor, the output shaft of the second motor penetrates into the second sorting box through a bearing and is fixed with a second baffle.

[0008] Further improvement lies in that light barriers are symmetrically fixed inside the detection frame, the light source port and the optical fiber port are located between the two groups of light barriers, and a through slot adapted to the photoelectric switch is formed in the light barrier.

[0009] Further improvement lies in that an incident light source is arranged on the side close to the outside of the detection frame, and the incident light source at the position of the light source port is a 100W incandescent lamp.

[0010] Further improvement lies in that a spectrometer is arranged on the side close to the outside of the detection frame, the spectrometer at the position of the optical fiber port adopts a hard trigger mode, when an external rising edge signal is transmitted to the spectrometer at the position of the optical fiber port, the spectrometer at the position of the optical fiber port starts to collect the spectrum of the current object.

[0011] Further improvement lies in that the two groups of photoelectric switches are opposite type photoelectric switches, when a three-wa li fruit passes between the two groups of photoelectric switches, the photoelectric switches detect the obstacle and generate a rising edge to the spectrometer at the position of the optical fiber port, and the spectrometer at the position of the optical fiber port collects the current spectrum information after receiving the signal.

[0012] Further improvement lies in that the speed of the first motor controlling the first baffle to rotate to the top end is greater than the falling speed of the three-wa li fruit, and the speed of the second motor controlling the second baffle to rotate to the top end is greater than the falling speed of the three-wa li fruit.

[0013] A control method of a three-plum sugar content sorting device based on near-infrared spectroscopy, comprising the following steps: the three-plum fruits to be sorted fall one after another in a free-falling manner into a spectrum collection device through an external feeding device, when the three-plum fruits fall to the center position inside the detection frame, the photoelectric switches on both sides are triggered, at this time, the photoelectric switches generate a rising edge signal to the spectrometer at the position of the optical fiber port, when there is an external rising edge signal transmitted to the spectrometer, the light rays incident into the detection frame through the light source port penetrate the three-plum fruits and transmit signals to the optical fiber port, after the spectrometer receives the signals through the optical fiber port, the spectrum information of the current three-plum fruits is collected, the sugar content of the three-plum fruits is obtained through the judgment and analysis of the spectrometer, the sugar content information is transmitted to the upper computer by the spectrometer, then the upper computer transmits the sugar content information to the single-chip microcomputer through serial communication, the single-chip microcomputer makes a judgment and controls the first motor and the second motor to drive the first baffle and the second baffle to rotate respectively, the first baffle and the second baffle are clamped at the top end and form a sorting channel respectively, the three-plum fruits fall along the sorting channel, and the sugar content sorting of the three-plum fruits is realized.

[0014] Further improvement lies in that the number of motors in the fruit sorting device is determined according to the number of sugar content sorting gradients of the three-plum fruits, and the number of sugar content sorting gradients of the three-plum fruits = the number of motors + 1.

[0015] The three-plum sugar content sorting device of the present application has the advantages that: the spectrum information of the three-plum fruits is collected by the spectrum collection device, and based on the collected spectrum information, the control strategy combining the near-infrared spectroscopy technology and the single-chip microcomputer is adopted, the rotation of the first baffle and the second baffle is controlled by the first motor and the second motor, the sugar content sorting control of the three-plum fruits is completed, the automatic sorting can be realized, the rapid, non-destructive and efficient analysis and identification can be realized, the human intervention is reduced, the stability of the sorting effect is ensured, compared with the traditional sorting equipment, the cost is lower, the production efficiency can be improved, and the structure of the technology is relatively simple, without complex mechanical structure and control system, easy to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a three-plum sugar content sorting device of the present application embodiment one;

[0017] Figure 2 is a spectrum collection device of the present application embodiment one;

[0018] Figure 3 is a fruit sorting device of the present application embodiment one;

[0019] Figure 4 is a fruit sorting device of the present application embodiment one;

[0020] Figure 5 is the original spectrum chart of the first batch of experiments of the first embodiment of the present application;

[0021] Figure 6 is the SG pretreatment spectrum chart of the first batch of experiments of the first embodiment of the present application;

[0022] Figure 7 is the SNV pretreatment spectrum chart of the first batch of experiments of the first embodiment of the present application;

[0023] Figure 8 is the scatter plot of the first batch of sugar content prediction values and actual values of the CARS-PLSR model of the first embodiment of the present application;

[0024] Figure 9 is the original spectrum chart of the second batch of experiments of the first embodiment of the present application;

[0025] Figure 10 is the SG pretreatment spectrum chart of the second batch of experiments of the first embodiment of the present application;

[0026] Figure 11 is the SNV pretreatment spectrum chart of the second batch of experiments of the first embodiment of the present application;

[0027] Figure 12 is the scatter plot of the second batch of sugar content prediction values and actual values of the CARS-PLSR model of the first embodiment of the present application;

[0028] Figure 13 is the control method flowchart of the second embodiment of the present application.

[0029] Wherein: 1, spectrum acquisition device; 101, detection block; 102, photoelectric switch; 103, light source port; 104, fiber port; 105, light barrier; 106, through slot; 2, fruit sorting device; 201, first sorting box; 202, first motor; 203, first baffle; 204, second sorting box; 205, second motor; 206, second baffle. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As a high-quality fruit, Sanhuali has good taste, high nutritional value, good planting benefits, and broad market prospects. With the improvement of planting technology and the change of market trends, the Sanhuali industry is expected to continue to maintain good development momentum.

[0032] The sugar content sorting of Prunus salicina helps to improve the overall quality and market competitiveness of Prunus salicina, and Prunus salicina with high sugar content is more popular because it is usually sweeter and more delicious. By sorting Prunus salicina with high sugar content, manufacturers can promote it as a high-end product on the market, thereby increasing the added value and profit space of the product. Therefore, sugar content sorting is very important in the production and processing of Prunus salicina.

[0033] In the sugar content sorting process of fruits such as plums, corresponding sugar content sorting equipment is needed for sorting processing, and the existing sugar content sorting equipment mostly has the problems of complex structure, low accuracy and stability of sugar content detection.

[0034] Embodiment one

[0035] In view of the problems existing in the prior art, see Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The embodiment provides a Prunus salicina sugar content sorting device based on near-infrared spectrum, which comprises a spectrum acquisition device 1 for Prunus salicina fruit spectrum information acquisition and a fruit sorting device 2 for Prunus salicina fruit sugar content sorting. The spectrum acquisition device 1 is fixed at the top of the fruit sorting device 2 and communicates with the fruit sorting device 2, so that the Prunus salicina fruit can fall from the spectrum acquisition device 1 into the fruit sorting device 2.

[0036] The spectrum acquisition device 1 comprises a detection box 101 and a photoelectric switch 102, wherein the detection box 101 is designed in a square shape and is in communication with the upper and lower parts, the photoelectric switch 102 is provided with two groups, the two groups of photoelectric switches 102 are symmetrically fixed to the inner walls on the left and right sides of the detection box 101 through screws, the front and rear sides of the detection box 101 are respectively provided with a light source port 103 and a fiber port 104, the light source port 103 and the fiber port 104 are on the same central axis and are matched with each other, the light source port 103 is used for external light source incidence, and the fiber port 104 is used as a spectrum sampling port provided by an external spectrometer.

[0037] The fruit sorting device 2 comprises a first sorting box 201 and a first motor 202, wherein the first sorting box 201 is fixed to the bottom end of the detection frame 101 and communicates with the detection frame 101, the second motor 202 is fixed to the outer side wall of the first sorting box 201 by bolts, the output shaft of the first motor 202 penetrates into the first sorting box 201 through a bearing and is fixed with a first baffle 203, the first baffle 203 is controlled to rotate by the first motor 202, so as to form a sorting channel in the first sorting box 201, the bottom end of the first sorting box 201 is fixed with a second sorting box 204 by bolts, and the second sorting box 204 communicates with the first sorting box 201, the outer side wall of the second sorting box 204 is fixed with a second motor 205 by bolts, the output shaft of the second motor 205 penetrates into the second sorting box 204 through a bearing and is fixed with a second baffle 206, the second baffle 206 is controlled to rotate by the second motor 205, so as to form a sorting channel in the second sorting box 204, and the front surface of the first sorting box 201 and the front surface of the second sorting box 204 are both provided with a discharge port, and a guide plate is fixed at the discharge port, which plays a guiding role for the sorted Sanhuali fruit.

[0038] In the embodiment, the Sanhuali fruit falls vertically one by one into the detection frame 101 through the feeding device, that is, free fall, when the Sanhuali fruit passes through the center of the detection frame 101, the photoelectric switch 102 on both sides is triggered, in the case of no obstacle (Sanhuali fruit), the light emitted by the emitter is directly detected by the receiver, and the photoelectric switch 102 is in the "ON" state, when there is an obstacle (Sanhuali fruit) passing through the light beam path, the light beam is blocked or reflected, so that the receiver cannot detect enough light, the photoelectric switch 102 switches to the "OFF" state, and an uplink signal is generated.

[0039] The detection frame 101 is fixed with light blocking plates 105 which are symmetrically distributed left and right, the light source port 103 and the optical fiber port 104 are located between the two groups of light blocking plates 105, the light blocking plates 105 are provided with through grooves 106 which are matched with the photoelectric switch 102, and the light blocking plates 105 block the influence of the light source on the photoelectric switch 102, so that the triggering of the photoelectric switch 102 is as fast as possible.

[0040] The light source port 103 is provided with an incident light source close to one side of the outside of the detection frame 101, through experimental test, 50W and 75W light sources cannot penetrate the Sanhuali fruit, so that the effective spectrum cannot be obtained, therefore, the incident light source at the position of the light source port 103 in the embodiment adopts a 100W incandescent lamp.

[0041] The optical fiber port 104 is provided with a spectrometer close to the outside of the detection block 101. The spectrometer at the position of the optical fiber port 104 adopts a hard trigger mode. When an external rising edge signal is transmitted to the spectrometer at the position of the optical fiber port 104, the spectrometer at the position of the optical fiber port 104 starts to collect the spectrum of the current object.

[0042] The two groups of photoelectric switches 102 are of a reflection type. Compared with a diffuse reflection type, the reflection type has better stability, faster reaction speed, and stronger anti-interference ability, and can realize longer distance detection. When a plum fruit passes between the two groups of photoelectric switches 102, the photoelectric switch 102 detects the plum fruit to generate an electrical signal, i.e., a rising edge signal. The rising edge signal refers to the moment when the signal changes from a low level (0 volt) to a high level (5 volts) quickly. This signal change can be used as a trigger event to make the spectrometer at the position of the optical fiber port 104 start to perform a spectrum collection operation to collect the spectrum information of the current plum fruit, thereby realizing the effect of collecting the spectrum of the plum fruit in the free fall process of the plum fruit.

[0043] The plum spectrum information obtained through the judgment and analysis of the spectrometer is first transmitted to the upper computer. Then, the upper computer analyzes the sugar content information of the plum through a CARS-PLSR sugar content model. The upper computer transmits the sugar content information to the single-chip microcomputer through serial communication. The single-chip microcomputer makes a judgment to control the forward and reverse rotation of the first motor 202 and the second motor 205, thereby respectively controlling the rotation of the first baffle 203 and the second baffle 206. The first baffle 203 and the second baffle 206 rotate to the top end to be clamped to form a channel, thereby completing the sorting of the plum fruit.

[0044] The speed of the first motor 202 in controlling the rotation of the first baffle 203 to the top end is greater than the falling speed of the plum fruit. The speed of the second motor 205 in controlling the rotation of the second baffle 206 to the top end is greater than the falling speed of the plum fruit, so as to ensure that a channel is formed when the plum fruit falls, thereby facilitating the sorting of the plum fruit.

[0045] The spectrum collection device 1 provided in the embodiment is used for spectrum collection experiments of plum fruits. In a first batch of experiments, 120 extra-large fruits are selected, with an average mass of 61.2 g and an average diameter of 4.91 cm. In a second batch of experiments, 110 large fruits are selected, with an average mass of 49.34 g and an average diameter of 4.33 cm.

[0046] The first batch of experiments mainly analyzes the integral time. Three gradients of the integral time are set. The spectrum data is collected at a unified height. The original spectrum diagram collected is as shown in FIG. 1. Figure 5 Figure 5 ​Part a is the 10ms+5cm group, part b is the 15ms+5cm group, and part c is the 20ms+5cm group). The first batch of experimental parameter changes are shown in Table 1 below:

[0047] Table 1 Changes in the first batch of experimental parameters

[0048]

[0049] The preprocessing used is SG smoothing algorithm and SNV (Standard Normal Variate) preprocessing. The spectrum after SG preprocessing is as follows Figure 6 As shown, the spectrum after SNV preprocessing is as follows Figure 7 As shown;

[0050] Then, CARS feature extraction is performed on the pre-processed spectral data, and the extracted features are used to establish a partial least squares regression model. The data obtained are as follows: Figure 8 As shown in Table 2 below:

[0051] Table 2 Data of the first batch of experiments CARS-PLSR model

[0052]

[0053] Among them, a is the test set and b is the prediction set;

[0054] In summary, for the large-sized Sanhua plum, an integration time of about 15ms is more reasonable. A larger integration time will collect too much invalid information, while a smaller integration time will result in missing the optimal collection interval, leading to poor model performance.

[0055] The second batch of experiments mainly analyzed the integration time and release height. The original spectra collected in the second batch of experiments are shown in the figure below. Figure 9 As shown ( Figure 9 Part a is the 8ms+2.5cm group, part b is the 10ms+2.5cm group, part c is the 8ms+5cm group, part d is the 10ms+5cm group, part e is the 8ms+7.5cm group, and part f is the 10ms+7.5cm group. The parameter changes for the second batch of experiments are shown in Table 3 below:

[0056] Table 3 Changes in experimental parameters for the second batch

[0057]

[0058] The same preprocessing method as the first batch of experiments was used, and the spectrum after SG preprocessing was as follows Figure 10 As shown, the spectrum after SNV preprocessing is as follows Figure 11 As shown;

[0059] The CARS feature extraction is performed on the pretreated spectral data, and a partial least squares regression model is established using the extracted features, and the obtained data is as follows Figure 12 and Table 4 below:

[0060] Table 4 CARS-PLSR model data table of the second batch of three Li experiments

[0061]

[0062]

[0063] Wherein, a is the test set, b is the prediction set;

[0064] In summary, for the large fruit of three Li, it is reasonable to take an integral time of about 8ms, and taking a larger integral time will collect too much invalid information, and taking a smaller integral time will miss the optimal collection interval, resulting in poor performance of the model.

[0065] Example two

[0066] Referring to Figure 13 , for example one, the embodiment provides a control method of a three Li sugar sorting device based on near-infrared spectroscopy, which comprises the following steps: the three Li fruits to be sorted fall into the spectral collection device 1 one by one in a free fall manner through the external feeding equipment, when the three Li fruits fall to the center position inside the detection frame 101, the photoelectric switch 102 on both sides is triggered, at this time the photoelectric switch 102 generates a rising edge signal to the spectrometer at the position of the optical fiber port 104, when the external rising edge signal is transmitted to the spectrometer, the light incident into the detection frame 101 through the light source port 103 penetrates the three Li fruits and transmits the signal to the optical fiber port 104, after the spectrometer receives the signal through the optical fiber port 104, it starts to collect the spectral information of the current three Li fruits, the sugar content of the three Li fruits is obtained through the judgment and analysis of the spectrometer, the sugar content information is transmitted to the upper computer by the spectrometer, then the upper computer transmits the sugar content information to the single-chip microcomputer through serial communication, the single-chip microcomputer makes a judgment and controls the first motor 202 and the second motor 205 to drive the first baffle 203 and the second baffle 206 to rotate respectively, the first baffle 203 and the second baffle 206 rotate to the top and are clamped to form a sorting channel respectively, the three Li fruits fall along the sorting channel, realizing the sugar sorting of the three Li fruits.

[0067] In this embodiment, the number of motors in the fruit sorting device 2 is determined according to the number of sugar sorting gradients of the three Li fruits, the number of sugar sorting gradients of the three Li fruits = the number of motors + 1, this embodiment has two groups of motors including the first motor 202 and the second motor 205, so the number of sugar sorting gradients of the three Li fruits is three, and the overall operation logic is as follows:

[0068] If the sugar content is the first gradient, the rotation flag bit of the first motor 202 and the second motor 205 is detected (1 represents having rotated, 0 represents not having rotated), if the first motor 202 is in the rotated state, it is not necessary to rotate, if it is in the unrotated state, the first motor 202 is rotated forward, and after rotating for a period of time, it is stopped and rotated to the flag bit position 1, which represents that it has rotated, if the second motor 205 is in the unrotated state, it is not necessary to rotate, if it is in the rotated state, the second motor 205 is rotated reversely, and after rotating for a period of time, it is stopped and returned to the initial position;

[0069] If the sugar content is the second gradient, the rotation flag bit of the first motor 202 and the second motor 205 is still detected (1 represents having rotated, 0 represents not having rotated), if the first motor 202 is in the rotated state, the first motor 202 is rotated reversely, and after rotating for a period of time, it is returned to the initial position, if it is in the unrotated state, it is not necessary to rotate, if the second motor 205 is in the unrotated state, the second motor 205 is rotated forward, and after rotating for a period of time, it is stopped and rotated to the flag bit position 1, which represents that it has rotated, if the second motor 205 is in the rotated state, the second motor 205 does not need to rotate;

[0070] If the sugar content is the third gradient, the rotation flag bit of the first motor 202 and the second motor 205 is detected, as long as the first motor 202 and the second motor 205 are in the rotated state, they are returned, if the first motor 202 and the second motor 205 are in the unrotated state, it is not necessary to rotate, in this way, the rotation control of the first baffle 203 and the second baffle 206 is completed, so that the plums (Sanhua plum fruits) are sorted.

[0071] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A Sanhua plum sugar content sorting device based on near-infrared spectroscopy, comprising a spectrum collection device (1) and a fruit sorting device (2), characterized in that: The spectrum collection device (1) is fixed to the top of the fruit sorting device (2), and comprises a detection frame (101) and photoelectric switches (102) symmetrically fixed to the inner walls of both sides of the detection frame (101). The detection frame (101) is arranged in a square shape and has upper and lower communicating openings. The inner walls of the detection frame (101) on both sides where the photoelectric switches (102) are not arranged are respectively provided with light source ports (103) and optical fiber ports (104) that are adapted to each other. The fruit sorting device (2) comprises a first sorting box (201) fixed to the bottom end of the detection frame (101) and in communication therewith, and a first motor (202) fixed to the outer wall of the first sorting box (201), wherein the output shaft of the first motor (202) passes through the first sorting box (201) via a bearing and is fixed with a first baffle (203), a second sorting box (204) in communication therewith is fixed to the bottom end of the first sorting box (201), a second motor (205) is fixed to the outer wall of the second sorting box (204), and the output shaft of the second motor (205) passes through the second sorting box (204) via a bearing and is fixed with a second baffle (206); A spectrometer is provided on one side of the optical fiber port (104) close to the outside of the detection box (101). The spectrometer at the optical fiber port (104) adopts a hard trigger mode. When an external rising edge signal is transmitted to the spectrometer at the optical fiber port (104), the spectrometer at the optical fiber port (104) starts to collect the spectrum of the current object. The two groups of photoelectric switches (102) are opposing photoelectric switches. When a Sanhua plum fruit passes between the two groups of photoelectric switches (102), the photoelectric switch (102) detects the obstacle and generates a rising edge to the spectrometer at the optical fiber port (104). After receiving the signal, the spectrometer at the optical fiber port (104) collects the current spectrum information. The first motor (202) controls the first baffle (203) to rotate to the top at a speed greater than the falling speed of the Sanhua plum fruit. The second motor (205) controls the second baffle (206) to rotate to the top at a speed greater than the falling speed of the Sanhua plum fruit.

2. The device for sorting the sugar content of Sanhua plums based on near infrared spectroscopy according to claim 1, characterized in that: Light blocking plates (105) are symmetrically fixed inside the detection frame (101), the light source port (103) and the optical fiber port (104) are located between two sets of light blocking plates (105), and a through slot (106) adapted to the photoelectric switch (102) is provided on the light blocking plate (105).

3. The device for sorting the sugar content of Sanhua plums based on near infrared spectroscopy according to claim 1, characterized in that: An incident light source is provided on a side of the light source port (103) close to the outside of the detection box (101), and the incident light source at the light source port (103) is a 100W incandescent lamp.

4. A control method for a Sanhua plum sugar content sorting device based on near infrared spectroscopy, as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: The Sanhua plum fruits to be sorted are dropped into the spectrum collection device (1) one by one in a free-fall manner through an external loading device. When the Sanhua plum fruits fall to the center position inside the detection box (101), the photoelectric switches (102) on both sides are triggered. At this time, the photoelectric switches (102) generate a rising edge signal to the spectrometer at the optical fiber port (104). When an external rising edge signal is transmitted to the spectrometer, the light incident into the detection box (101) through the light source port (103) penetrates the Sanhua plum fruits and transmits the signal to the optical fiber port (104). The spectrometer receives the signal through the optical fiber port (104). After the signal is received, the spectrum information of the current Sanhua plum fruit is collected, and the sugar content of the Sanhua plum fruit is obtained through judgment and analysis by the spectrometer. The sugar content information is then transmitted to the host computer by the spectrometer, and then the host computer transmits the sugar content information to the single-chip microcomputer through serial communication. The single-chip microcomputer makes a judgment and controls the first motor (202) and the second motor (205) to respectively drive the first baffle (203) and the second baffle (206) to rotate. After the first baffle (203) and the second baffle (206) rotate to the top, they are stuck and form a sorting channel respectively. The Sanhua plum fruit falls along the sorting channel, thereby realizing the sugar content sorting of the Sanhua plum fruit.

5. The control method of the Sanhua plum sugar content sorting device based on near infrared spectroscopy according to claim 4, characterized in that: The number of motors in the fruit sorting device (2) is determined according to the number of sugar content sorting gradients of the Sanhua plum fruit, and the number of sugar content sorting gradients of the Sanhua plum fruit = the number of motors + 1.

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