Detection device capable of efficiently and continuously detecting internal quality of agricultural products

Abstract

The invention relates to the technical field of agricultural product detection, in particular to a detection device capable of efficiently and continuously detecting the internal quality of agricultural products, which comprises a feeding unit, a detection unit, a shifting unit and a discharging unit. Wherein the detection unit comprises a detection table arranged at the discharging end of the feeding unit, a top light detection assembly arranged on the detection table, a side light detection assembly arranged on the detection table, a bottom light detection assembly arranged on the detection table, and a limiting air cylinder arranged between the detection table and the feeding unit, and the detection direction of the side light detection assembly is perpendicular to the top light detection assembly. By arranging the detection unit, the effect of comprehensively, efficiently and automatically detecting agricultural products of different specifications can be achieved, and by arranging the top light detection assembly, the bottom light detection assembly and the photometric detection assembly, all-directional rapid detection of samples is achieved within the limited unit sample detection time; the rapid and efficient detection requirements of an agricultural product production line are met.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural product detection, in particular to a device for detecting the internal quality of agricultural products efficiently and continuously. Background Art

[0002] Modern agricultural product production companies need to be equipped with equipment that can automate assembly line operations and quickly test the internal quality of agricultural products. Production companies need to use testing equipment to evaluate the internal quality of agricultural products, such as water content, sugar content, protein content, maturity, internal defects, etc.

[0003] Generally speaking, a more efficient detection method is to use optical means to test or analyze the samples to be tested. However, traditional testing and analysis instruments require manual light source adjustment, and the detection time for a single sample is long, which cannot meet the high-efficiency detection needs in agricultural product production workshops. The existing detection equipment cannot achieve comprehensive and rapid detection of different types of agricultural products when directly used on agricultural product transportation lines. Summary of the invention

[0004] In view of the problem that the existing detection equipment in the above or prior art cannot achieve comprehensive and rapid detection of different types of agricultural products when directly used on the agricultural product transportation line, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a device for detecting the internal quality of agricultural products efficiently and continuously.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for efficiently and continuously detecting the internal quality of agricultural products, characterized in that it includes a feeding unit, a detection unit, a shifting unit and a discharging unit.

[0007] Among them, the detection unit includes a detection platform arranged at the discharge end of the feeding unit, a top light detection component arranged on the detection platform, a side light detection component arranged on the detection platform and whose detection direction is perpendicular to the top light detection component, a bottom light detection component arranged on the detection platform, and a limit cylinder arranged between the detection platform and the feeding unit.

[0008] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, a reflector and a detection platform are arranged on the detection table; the detection platform is located at the intersection of the detection path of the top light detection component and the detection path of the side light detection component; the detection platform is located between the reflector and the top light detection component.

[0009] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, wherein: a group of fan-shaped bottom light penetration through holes and two groups of top light penetration through holes are provided on the detection platform; the reflector is located below the fan-shaped bottom light penetration through holes and the top light penetration through holes.

[0010] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the top light detection component includes a top light frame arranged on the detection table, a top light detection light source arranged on the top light frame, and a condenser arranged on the top light frame.

[0011] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the side light detection component includes a light source driver disposed on the detection platform and a side light detection light source disposed on the light source driver.

[0012] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the bottom light detection component includes a rotating frame arranged on the detection table, and a bottom light source arranged on the rotating frame.

[0013] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the feeding unit includes a feeding rack, a feeding conveyor belt arranged on the feeding rack, a material tray arranged on the feeding conveyor belt, and a limiting component arranged on the feeding rack and located on both sides of the feeding conveyor belt for limiting the material tray.

[0014] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the limit assembly includes a limit mounting seat arranged on the feeding rack, a limit pin arranged on the limit mounting seat, and a positioning strip arranged on the limit pin and located on both sides of the feeding conveyor belt and cooperating with the material tray.

[0015] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the shift unit comprises a shift frame, a linear motion servo assembly arranged on the shift frame, and a shift member arranged on the linear motion servo assembly and slidably connected to the shift frame; The displacement member includes a connecting rod, and a feeding displacement frame and a discharging displacement frame respectively arranged at both ends of the connecting rod; the discharging displacement frame is provided with a discharging claw, and the feeding displacement frame is provided with a feeding claw; the length of the connecting rod is equal to the distance between the feeding unit and the discharging unit.

[0016] As a preferred solution of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention, the discharging unit includes a discharging rack, a material guide slope arranged on the discharging rack, and a discharging conveyor belt arranged between the material guide slope and the detection unit; a screening plate is rotatably arranged on the material guide slope.

[0017] The beneficial effects of the device for efficiently and continuously detecting the internal quality of agricultural products of the present invention are as follows: by setting up the detection unit, it is possible to achieve the effect of comprehensive, efficient and automatic detection of agricultural products of different specifications; by setting up the top light detection component, the bottom light detection component and the photometric detection component, it is possible to achieve all-round rapid detection of samples within a limited unit sample detection time, thereby meeting the rapid and efficient detection requirements of the agricultural product production line; by setting up the limit component, the feeding limit is performed on agricultural products of different specifications, thereby expanding the scope of application of the present invention; by setting up the shift unit, the continuity of the overall work is improved, and the work efficiency of the assembly line operation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work. Figure 1 The overall structure of the device for efficiently and continuously testing the internal quality of agricultural products is shown in Fig. Figure 1 .

[0019] Figure 2 The overall structure of the device for efficiently and continuously testing the internal quality of agricultural products is shown in Fig. Figure 2 .

[0020] Figure 3 It is the main view of the detection unit of the detection device which can efficiently and continuously detect the internal quality of agricultural products.

[0021] Figure 4 It is a rear view of the detection unit of the detection device which can detect the internal quality of agricultural products efficiently and continuously.

[0022] Figure 5 It is an exploded view of the detection unit of the detection device which can detect the internal quality of agricultural products efficiently and continuously.

[0023] Figure 6 The present invention is a schematic diagram of the structure of a feeding unit of a device for detecting the internal quality of agricultural products efficiently and continuously.

[0024] Figure 7 The present invention is a schematic diagram of the structure of a displacement unit of a device for detecting the internal quality of agricultural products efficiently and continuously.

[0025] Figure 8 The present invention is a schematic diagram of the structure of the discharging unit of the device for detecting the internal quality of agricultural products efficiently and continuously.

[0026] In the figure: 100, feeding unit; 101, feeding rack; 102, feeding conveyor belt; 103, material tray; 104, limit assembly; 104a, limit mounting seat; 104b, limit pin; 200, detection unit; 201, detection table; 201a, reflector; 201b, detection platform; 201b-1, fan-shaped bottom light penetration hole; 201b-2, top light penetration hole; 202, top light detection assembly; 202a, top light rack; 202b, top light detection light source; 202c, condenser; 203, side light detection assembly; 203a, Light source driving part; 203b, side light detection light source; 204, bottom light detection component; 204a, rotating frame; 204b, bottom light source; 205, limiting cylinder; 300, shifting unit; 301, shifting frame; 302, linear motion servo component; 303, shifting part; 303a, connecting rod; 303b, discharging shifting frame; 303b-1, discharging claw; 303c, feeding shifting frame; 303c-1, feeding claw; 400, discharging unit; 401, discharging frame; 402, guiding slope; 402a, screening plate; 403, discharging conveyor belt. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] Example 1, reference Figure 1-2 , is the first embodiment of the present invention, which provides an efficient and continuous internal quality detection device for agricultural products, and can achieve the effect of comprehensive, efficient and automatic detection of agricultural products of different specifications, including an efficient and continuous internal quality detection device for agricultural products, characterized by: comprising a feeding unit 100, a detection unit 200, a shift unit 300 and a discharging unit 400. The detection unit 200 uses near-infrared spectroscopy technology to efficiently detect agricultural products, and uses multiple groups of different light sources to achieve comprehensive and rapid detection of agricultural products, thereby improving detection accuracy and detection efficiency.

[0029] The detection unit 200 includes a detection platform 201 disposed at the discharge end of the feeding unit 100, a top light detection component 202 disposed on the detection platform 201, a side light detection component 203 disposed on the detection platform 201 and having a detection direction perpendicular to the top light detection component 202, a bottom light detection component 204 disposed on the detection platform 201, and a limit cylinder 205 disposed between the detection platform 201 and the feeding unit 100. A reflector 201a for reflecting the light source is disposed on the detection platform 201. The setting of the reflector 201a increases the number of penetrations of the light source into the agricultural product detection sample within a limited time, thereby improving the detection accuracy. By arranging the top light detection component 202, the side light detection component 203 and the bottom light detection component 204, a comprehensive light source detection is performed on the agricultural products from different directions, thereby achieving the most comprehensive and efficient detection effect of the sample within a unit time. The setting of the limit cylinder 205 ensures that only one group of agricultural product samples to be monitored enters the detection unit 200 at a time, avoiding the mixing and stacking of multiple groups of samples, thereby improving the detection accuracy of a single sample, avoiding mutual collision and squeezing between agricultural products, and reducing the possibility of agricultural product damage during the detection process.

[0030] The process of internal quality inspection of agricultural products using near infrared spectroscopy technology adopted by the detection unit 200 is as follows: First, it is necessary to ensure that the agricultural product sample is in a state suitable for inspection. The pretreatment of agricultural products includes cleaning the surface of the sample and removing any impurities that may affect the spectral reading. The agricultural product sample is irradiated with a near infrared spectrometer. The light emitted by the spectrometer will be absorbed by the chemical components in the sample, and different components will absorb more light at specific wavelengths. The light reflected or transmitted by the sample is captured by the detector in the spectrometer, and the light intensity of each wavelength is recorded to form a spectrum. Due to the influence of environmental factors and instrument noise, the raw spectral data may need to be optimized through preprocessing steps, including noise removal, baseline drift correction, normalization, etc. Using chemometric methods, the near infrared spectral data is associated with the reference values ​​of the internal components of agricultural products obtained by traditional chemical analysis methods. This step requires the establishment of a calibration model that can convert the spectral data into specific quality parameters, such as protein content, fat content, moisture, sugar, etc. The accuracy of the model is tested by using an independent validation set to ensure that the model has good predictive ability and robustness. In practical applications, agricultural products are placed on the feeding unit 100 of the detection device, and the detection unit 200 collects spectral data in real time and uses the previously established model to predict internal quality parameters.

[0031] During use, agricultural products follow the feeding unit 100 and enter the bottom of the detection unit 200 one by one. In one working cycle of the shift unit 300, a single sample of the feeding unit 100 can be transferred to the detection station of the detection unit 200, and the sample detected by the detection unit 200 can also be transferred to the discharging unit 400, thereby improving the working efficiency of material transfer. The discharging unit 400 is provided with a screening structure, which can switch the discharging path for agricultural products that do not meet the standards detected by the detection unit 200, thereby realizing the need to directly screen the materials after the detection is completed.

[0032] Example 2, reference Figure 1 to Figure 5 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a detection unit 200 capable of efficiently and continuously detecting the internal quality detection device of agricultural products, and solves the technical problem of efficient and comprehensive quality inspection of agricultural products. A reflector 201a and a detection platform 201b are arranged on the detection platform 201; the detection platform 201b is located at the intersection of the detection path of the top light detection component 202 and the detection path of the side light detection component 203; the detection platform 201b is located between the reflector 201a and the top light detection component 202. The material is transferred to the detection platform 201b by the shift unit 300, and the material on the detection platform 201b directly receives the light source detection of the top light detection component 202 and the side light detection component 203. The bottom light detection component 204 can correct and compensate for the detection of the top light detection component 202 and the side light detection component 203, so as to realize the comprehensive detection of a single sample, find the missing position of the light source detection according to the data feedback model, and realize the complete detection of the sample by controlling the light source position of the bottom light detection component 204.

[0033] Furthermore, a group of fan-shaped bottom light penetration holes 201b-1 and two groups of top light penetration holes 201b-2 are provided on the detection platform 201b; the reflector 201a is located below the fan-shaped bottom light penetration holes 201b-1 and the top light penetration holes 201b-2. The fan-shaped bottom light penetration holes 201b-1 are provided, and the arc edge of the fan-shaped bottom light penetration holes 201b-1 is directly opposite to the light source position of the bottom light detection component 204, so as to facilitate the detection light source of the bottom light detection component 204 to penetrate the detection platform 201b. The bottom light penetration holes 201b-1 provided on the detection platform 201b can facilitate the light source of the top light detection component 202 that is not irradiated on the sample to reach the reflector 201a, and then the reflection direction of the reflector 201a is controlled according to the servo mechanism between the reflector 201a and the detection platform 201, so as to avoid the waste of the light source of the top light detection component 202.

[0034] Furthermore, the top light detection assembly 202 includes a top light frame 202a disposed on the detection platform 201, a top light detection light source 202b disposed on the top light frame 202a, and a condenser 202c disposed on the top light frame 202a. The top light detection light source 202b can penetrate the detection platform 201b through the bottom light penetration hole 201b-1, and most of the detection light source is irradiated to the sample surface. The condenser 202c reduces the scattering of the detection light source toward the outside world, thereby improving the concentration of the light source.

[0035] Furthermore, the side light detection assembly 203 includes a light source driver 203a disposed on the detection platform 201, and a side light detection light source 203b disposed on the light source driver 203a. The light source driver 203a can drive the side light detection light source 203b to change the irradiation angle relative to the sample, thereby achieving comprehensive detection of the sample.

[0036] Furthermore, the bottom light detection assembly 204 includes a rotating frame 204a disposed on the detection platform 201, and a bottom light source 204b disposed on the rotating frame 204a. The rotating frame 204a can be controlled by an operator of the central processing unit to drive the bottom light source 204b to change the irradiation angle relative to the sample, thereby achieving comprehensive detection of the sample.

[0037] During use, agricultural products follow the feeding unit 100 and enter the bottom of the detection unit 200 one by one. Within one working cycle of the shift unit 300, a single sample of the feeding unit 100 can be transferred to the detection station of the detection unit 200, and the sample detected by the detection unit 200 can also be transferred to the discharging unit 400, thereby improving the working efficiency of material transfer. A screening structure is provided in the discharging unit 400, which can switch the discharging path of agricultural products that do not meet the standards detected by the detection unit 200, thereby realizing the need to directly screen the materials after the detection is completed. The materials are transferred to the detection platform 201b by the shift unit 300, and the materials on the detection platform 201b are directly subjected to the light source detection of the top light detection component 202 and the side light detection component 203. The bottom light detection component 204 can correct and compensate for the detection of the top light detection component 202 and the side light detection component 203, thereby realizing comprehensive detection of a single sample, finding the missing position of the light source detection according to the data feedback model, and realizing complete detection of the sample by controlling the light source position of the bottom light detection component 204. A fan-shaped bottom light penetration hole 201b-1 is provided, and the arc edge of the fan-shaped bottom light penetration hole 201b-1 is directly opposite to the light source position of the bottom light detection component 204, so as to facilitate the detection light source of the bottom light detection component 204 to penetrate the detection platform 201b. The bottom light penetration hole 201b-1 provided on the detection platform 201b can facilitate the light source of the top light detection component 202 that is not irradiated on the sample to reach the reflector 201a, and then the reflection direction of the reflector 201a is controlled according to the servo mechanism between the reflector 201a and the detection platform 201, so as to avoid the waste of the light source of the top light detection component 202. The top light detection light source 202b can penetrate the detection platform 201b through the bottom light penetration hole 201b-1, and most of the detection light source is irradiated on the sample surface. The condenser 202c reduces the scattering of the detection light source toward the outside world, and improves the concentration of the light source.

[0038] The rest of the structure is the same as that of Example 1.

[0039] Example 3, reference Figures 1 to 8 , which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a feeding unit 100, a shifting unit 300 and a discharging unit 400 that can efficiently and continuously detect the internal quality of agricultural products, solving the problem of automated work of the efficient agricultural product detection line. The agricultural products follow the feeding unit 100 and enter the bottom of the detection unit 200 one by one. Within one working cycle of the shifting unit 300, a single sample of the feeding unit 100 can be transferred to the detection station of the detection unit 200, and the sample detected by the detection unit 200 can also be transferred to the discharging unit 400, thereby improving the working efficiency of material transfer.

[0040] The feeding unit 100 includes a feeding rack 101, a feeding conveyor belt 102 disposed on the feeding rack 101, a material tray 103 disposed on the feeding conveyor belt 102, and a limiting component 104 disposed on the feeding rack 101 and located on both sides of the feeding conveyor belt 102 for limiting the material tray 103. The material tray 103 is adjusted according to the specific production line product to meet the inspection requirements of agricultural products of different specifications.

[0041] Furthermore, the limiting assembly 104 includes a limiting mounting seat 104a disposed on the feeding rack 101, a limiting pin 104b disposed on the limiting mounting seat 104a, and a positioning bar 104c disposed on the limiting pin 104b and located on both sides of the feeding conveyor belt 102 and matched with the material tray 103. The limiting assembly 104 is provided, and the limiting pin 104b adjusts the distance between the positioning bars 104c located on both sides of the feeding conveyor belt 102. The distance between the positioning bars 104c is equal to the diameter of the material tray 103, which plays a role in limiting and guiding the transportation of the material tray 103.

[0042] Further, the shift unit 300 includes a shift frame 301, a linear motion servo assembly 302 disposed on the shift frame 301, and a shift member 303 disposed on the linear motion servo assembly 302 and slidably connected to the shift frame 301; the shift member 303 includes a connecting rod 303a, and a feeding shift frame 303c and a discharging shift frame 303b respectively disposed at both ends of the connecting rod 303a; a discharging claw 303b-1 is disposed on the discharging shift frame 303b, and a feeding claw 303c-1 is disposed on the feeding shift frame 303c; the length of the connecting rod 303a is equal to the distance between the feeding unit 100 and the discharging unit 400. In one working cycle of the shift unit 300, a single sample of the feeding unit 100 can be transferred to the detection station of the detection unit 200, and a sample detected by the detection unit 200 can also be transferred to the discharging unit 400, thereby improving the working efficiency of material transfer.

[0043] Furthermore, the discharging unit 400 includes a discharging frame 401, a guide slope 402 disposed on the discharging frame 401, and a discharging conveyor belt 403 disposed between the guide slope 402 and the detection unit 200; a screening plate 402a is rotatably disposed on the guide slope 402. The discharging unit 400 is provided with a rotatably controlled screening plate 402a, which can switch the discharging path of agricultural products that do not meet the standards detected by the detection unit 200, thereby realizing the need to screen the materials after the detection is completed.

[0044] During use, agricultural products follow the feeding unit 100 and enter the bottom of the detection unit 200 one by one. In one working cycle of the shift unit 300, a single sample of the feeding unit 100 can be transferred to the detection station of the detection unit 200, and the sample detected by the detection unit 200 can also be transferred to the discharging unit 400, thereby improving the working efficiency of material transfer. The discharging unit 400 is provided with a screening structure, which can switch the discharging path for agricultural products that do not meet the standards detected by the detection unit 200, thereby realizing the need to directly screen the materials after the detection is completed.

[0045] The rest of the structure is the same as that of Example 2.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A device for efficiently and continuously detecting the internal quality of agricultural products, characterized in that: include, Feeding unit (100); The detection unit (200) comprises a detection platform (201) arranged at the discharge end of the feeding unit (100), a top light detection component (202) arranged on the detection platform (201), a side light detection component (203) arranged on the detection platform (201) and having a detection direction perpendicular to the top light detection component (202), a bottom light detection component (204) arranged on the detection platform (201), and a limit cylinder (205) arranged between the detection platform (201) and the feeding unit (100); a shift unit (300) arranged in the direction of agricultural product detection operation; and A discharging unit (400) is arranged at the discharging end of the detection unit (200).

2. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 1, characterized in that: A reflector (201a) and a detection platform (201b) are provided on the detection table (201); the detection platform (201b) is located at the intersection of a detection path of the top light detection component (202) and a detection path of the side light detection component (203); and the detection platform (201b) is located between the reflector (201a) and the top light detection component (202).

3. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 2, characterized in that: The detection platform (201b) is provided with a group of fan-shaped bottom light penetration through holes (201b-1) and two groups of top light penetration through holes (201b-2); the reflector (201a) is located below the fan-shaped bottom light penetration through holes (201b-1) and the top light penetration through holes (201b-2).

4. The device for efficiently and continuously detecting the internal quality of agricultural products according to any one of claims 1 to 3, characterized in that: The top light detection component (202) comprises a top light frame (202a) arranged on the detection platform (201), a top light detection light source (202b) arranged on the top light frame (202a), and a condenser (202c) arranged on the top light frame (202a).

5. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 4, characterized in that: The side light detection component (203) comprises a light source driving component (203a) arranged on the detection platform (201), and a side light detection light source (203b) arranged on the light source driving component (203a).

6. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 5, characterized in that: The bottom light detection component (204) comprises a rotating frame (204a) arranged on the detection platform (201), and a bottom light source (204b) arranged on the rotating frame (204a).

7. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 5 or 6, characterized in that: The feeding unit (100) comprises a feeding rack (101), a feeding conveyor belt (102) arranged on the feeding rack (101), a material tray (103) arranged on the feeding conveyor belt (102), and a limiting component (104) arranged on the feeding rack (101) and located on both sides of the feeding conveyor belt (102) for limiting the material tray (103).

8. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 7, characterized in that: The limiting assembly (104) comprises a limiting mounting seat (104a) arranged on the feeding rack (101), a limiting pin (104b) arranged on the limiting mounting seat (104a), and a positioning strip (104c) arranged on the limiting pin (104b) and located on both sides of the feeding conveyor belt (102) and cooperating with the material tray (103).

9. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 8, characterized in that: The shift unit (300) comprises a shift frame (301), a linear motion servo assembly (302) arranged on the shift frame (301), and a shift member (303) arranged on the linear motion servo assembly (302) and slidably connected to the shift frame (301); The displacement member (303) comprises a connecting rod (303a), and a feeding displacement frame (303c) and a discharging displacement frame (303b) respectively arranged at two ends of the connecting rod (303a); a discharging claw (303b-1) is arranged on the discharging displacement frame (303b), and a feeding claw (303c-1) is arranged on the feeding displacement frame (303c); the length of the connecting rod (303a) is equal to the distance between the feeding unit (100) and the discharging unit (400).

10. The device for efficiently and continuously detecting the internal quality of agricultural products according to claim 9, characterized in that: The discharging unit (400) comprises a discharging frame (401), a material guiding slope (402) arranged on the discharging frame (401), and a discharging conveyor belt (403) arranged between the material guiding slope (402) and the detection unit (200); a screening plate (402a) is rotatably arranged on the material guiding slope (402).

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