Metal nuclear radiation intelligent detection equipment and detection method for seafood materials

Abstract

The invention relates to the technical field of seafood material safety detection, and particularly discloses a seafood material metal nuclear radiation intelligent detection device and a seafood material metal nuclear radiation intelligent detection method, comprising a conveying unit for conveying seafood materials, a grading detection unit, a shunting unit, a sample detection unit and an intelligent control unit, the grading detection unit is used for carrying out grading detection on metal foreign matters and nuclear radiation pollution on the seafood materials on the conveying unit, and the distribution unit distributes unqualified seafood materials according to a detection result of the grading detection unit; the sample detection unit is used for carrying out content analysis on metal foreign matters and nuclear radiation elements on the seafood samples on the sampling conveying unit and the shunting unit, and the intelligent control unit is electrically connected with each unit. Through cooperation of multiple units, graded detection of seafood material metal and nuclear radiation pollution, automatic distribution of unqualified products and accurate sampling analysis are realized, and the detection efficiency and coverage are improved; the intelligent control unit guarantees linkage of all links, and the misjudgment rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seafood safety detection, and discloses a seafood metal and nuclear radiation intelligent detection device and method. BACKGROUND

[0002] In the current seafood detection field, the traditional equipment often faces the problem that efficiency and precision are difficult to balance: under a single detection speed, high speed is easy to cause missed detection of fine metal foreign matter or low-dose nuclear radiation, and low speed reduces the overall detection efficiency; unqualified products are mixed and collected, it is difficult to trace the source of pollution, and during the conveying process, food materials are easy to fall and accumulate due to the lack of adaptive protection structure; the detection module is often uniformly configured, and it is difficult to optimize the detection module according to the different needs of preliminary screening and precision confirmation, and the recognition ability of non-ferromagnetic small components or low-dose radiation is insufficient; sampling often relies on manual operation, and there are problems such as poor sample representativeness and easy pollution, and there is a lack of real-time data feedback mechanism, so it is difficult to adjust in time when the equipment parameters drift, resulting in poor long-term detection stability, which is difficult to meet the comprehensive needs of high efficiency, precision and stability for seafood safety detection. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a seafood metal and nuclear radiation intelligent detection device and method.

[0004] To achieve the above-mentioned purpose, the seafood metal and nuclear radiation intelligent detection device of the present application comprises a conveying unit for conveying seafood, a hierarchical detection unit, a shunt unit, a sample detection unit and an intelligent control unit, the hierarchical detection unit is used for hierarchical detection of metal foreign matter and nuclear radiation pollution of the seafood on the conveying unit, the shunt unit is used for shunting unqualified seafood according to the detection result of the hierarchical detection unit, and the sample detection unit is used for sampling seafood samples on the conveying unit and the shunt unit to analyze the content of metal foreign matter and nuclear radiation elements.

[0005] The conveying unit comprises a first detection conveying line and a second detection conveying line arranged in sequence, the conveying speed of the first detection conveying line is higher than that of the second detection conveying line, the hierarchical detection unit comprises a first detection module arranged on the first detection conveying line and a second detection module arranged on the second detection conveying line, the detection sensitivity of the first detection module is lower than a preset high sensitivity threshold, the detection sensitivity of the second detection module is not lower than the preset high sensitivity threshold, and the intelligent control unit is electrically connected with each unit to receive online detection data of the first detection module and the second detection module and sample detection data of the sample detection unit, calculate the false detection rate and the missed detection rate of the two detection modules, and adjust the detection parameters of the first detection module or the second detection module when the missed detection rate or the false detection rate exceeds a preset threshold.

[0006] The device ensures the overall detection efficiency and the detection accuracy through the hierarchical detection mode of "high-speed preliminary detection + low-speed accurate detection". The first detection conveying line is high-speed conveying and is matched with low-sensitivity detection, which can quickly screen out obvious unqualified seafood and reduce the workload of subsequent accurate detection; the second detection conveying line is low-speed conveying and is matched with high-sensitivity detection, which can accurately identify fine metal foreign matters and low-dose nuclear radiation pollution and reduce the risk of missed detection. At the same time, the intelligent control unit analyzes the detection data in real time, calculates the false detection rate and the missed detection rate, adjusts the detection parameters in a timely manner, dynamically optimizes the detection effect, avoids the inaccurate detection results caused by the drift of the device parameters, greatly improves the reliability and stability of the seafood detection, and provides a strong guarantee for food safety.

[0007] Further, the shunting unit comprises a first NG conveying line connected with the first detection conveying line and a second NG conveying line connected with the second detection conveying line, the first NG conveying line is used for receiving the unqualified seafood detected by the first detection module, and the second NG conveying line is used for receiving the unqualified seafood detected by the second detection module; the first NG conveying line comprises an NG base frame, a transmission belt rotatably arranged on the NG base frame, and an NG driver for driving the transmission belt to rotate, and the NG base frame is provided with a strip-shaped blocking edge and an adjuster for adjusting the position of the strip-shaped blocking edge in the width direction of the transmission belt.

[0008] The shunting unit adopts double NG conveying lines to receive the unqualified seafood in different detection stages, realizes the classified collection and processing of unqualified products, avoids the mixing of seafood with different unqualified reasons, facilitates the subsequent tracing of unqualified sources, and also provides convenience for targeted processing of unqualified products, such as directly destroying the seafood unqualified in preliminary detection and further analyzing the pollution degree of the seafood unqualified in accurate detection. In addition, the strip-shaped blocking edge and the adjuster of the first NG conveying line can adjust the position of the blocking edge according to the size and shape of the seafood, prevent the unqualified seafood from falling or deviating during conveying, ensure the stable conveying of the unqualified products to the specified area, improve the practicability and adaptability of the shunting unit, and meet the detection and shunting needs of seafood of different specifications.

[0009] Further, the conveying unit further comprises a first climbing conveying line arranged at the front end of the first detection conveying line and a second climbing conveying line arranged at the rear end of the second detection conveying line, the first climbing conveying line is used for conveying the seafood to be detected to the first detection conveying line, and the second climbing conveying line is used for conveying the seafood detected qualified by the second detection conveying line to the next process; the first climbing conveying line comprises a climbing base frame, a conveying belt rotatably arranged on the climbing base frame, and a climbing driver for driving the conveying belt to rotate, and the conveying belt is arranged obliquely on the climbing base frame, and the inclination angle of the conveying belt is 15°-30°.

[0010] The setup of the first and second inclined conveyor lines optimizes the overall conveying process, automating the loading of ingredients for testing and the unloading of qualified ingredients. This reduces manual handling, lowers labor costs, and avoids the risk of food contamination from human contact. The 15°-30° conveyor belt inclination angle is rationally designed to ensure stable transport of seafood during the incline, preventing slippage due to excessive angle, while also effectively utilizing vertical space for a more compact layout and saving workshop floor space. Furthermore, the automated inclined conveyor system ensures a stable food transport speed, matching the speed of subsequent testing conveyors and preventing impacts on testing efficiency due to food accumulation or transport interruptions, thus guaranteeing the smooth operation of the entire testing process.

[0011] Furthermore, the first detection module includes a first metal detector and a first nuclear radiation detector, and the second detection module includes a second metal detector and a second nuclear radiation detector. The first nuclear radiation detector is a Geiger counter detector, and the second nuclear radiation detector is a NaI(Tl) scintillator detector. The first metal detector is a single-frequency electromagnetic induction coil and its detection sensitivity is corresponding to the ability to detect ferromagnetic metal foreign objects of Φ1.0mm and above. The second metal detector is a multi-frequency digital coil and its detection sensitivity is corresponding to the ability to detect non-ferromagnetic metal foreign objects of Φ0.3mm and above.

[0012] To address the needs of different detection stages, differentiated detectors are paired with the detection modules, significantly improving the targeting and accuracy of detection. The Geiger counter detector in the first detection module has a fast response speed, suitable for quickly identifying obvious nuclear radiation contamination in high-speed initial inspections; the single-frequency electromagnetic induction coil can efficiently detect larger-sized ferromagnetic metals, meeting the needs of rapid initial screening. The NaI(Tl) scintillator detector in the second detection module has high energy resolution, enabling accurate measurement of low-dose nuclear radiation, adapting to the high-precision requirements of low-speed fine inspections; the multi-frequency digital coil can detect finer non-ferromagnetic metals, avoiding missed detections due to metal type or small size. This differentiated configuration ensures both the efficiency of initial inspections and the accuracy of fine inspections, comprehensively covering possible metallic foreign objects and types of nuclear radiation contamination in seafood, improving the overall performance of the detection equipment.

[0013] Furthermore, the sample detection unit includes a sampling robotic arm and an XRF spectrometer disposed between the conveying unit and the diversion unit. The working range of the sampling robotic arm partially covers the first detection conveying line, the second detection conveying line, the first NG conveying line, and the second NG conveying line. It can randomly grab seafood samples on the sample conveying paths of the four conveying lines according to a preset program. The sampling robotic arm transfers the grabbed seafood samples to the sample detection position of the XRF spectrometer. The XRF spectrometer is used to detect the content of metallic foreign objects and nuclear radiation elements in the sample.

[0014] The sample testing unit utilizes a robotic arm to randomly sample from multiple transport lines, comprehensively acquiring samples of seafood at different testing stages and in varying states of compliance. This ensures sample representativeness and provides reliable data support for subsequent analysis. The XRF spectrometer, characterized by rapid and non-destructive testing, accurately analyzes the specific content of metallic foreign objects and radioactive elements in samples. This not only verifies the accuracy of online testing results but also provides a deeper understanding of the contamination level of seafood, offering quantitative evidence for determining whether the food meets safety standards. Furthermore, the combination of random sampling and precise analysis promptly identifies potential deviations in online testing, assisting the intelligent control unit in adjusting testing parameters. Simultaneously, it provides detailed testing data for food safety supervision, enhancing the credibility and authority of the test results.

[0015] Furthermore, both the first and second detection conveyor lines are equipped with a pushing mechanism, which is used to push the unqualified seafood ingredients to the diversion unit. The pushing mechanism includes a pushing cylinder set on the detection conveyor line and a pusher plate set on the output end of the pushing cylinder.

[0016] The pushing mechanism employs a design combining a pushing cylinder and a pusher plate, featuring rapid response and stable pushing force. It can quickly and accurately push substandard seafood to the sorting unit upon detection, preventing substandard items from entering the next stage along with qualified items, ensuring synchronization between detection and sorting, and reducing the risk of missed sorting. Simultaneously, the cylinder-driven pushing method is simple in structure, easy to maintain, and has a low failure rate, adapting to the humid and dusty environments of seafood testing, ensuring long-term stable operation of the equipment. Furthermore, the pusher plate design increases the contact area with the seafood, preventing damage during pushing, especially for fragile seafood, reducing unnecessary losses and balancing detection accuracy with food integrity.

[0017] Furthermore, the climbing frame is equipped with baffles and rotating support rollers. The baffles are located at the feeding end of the climbing frame and above the conveyor belt to prevent seafood from flowing back. The conveyor belt has annular sidewalls along its length and multiple dividing strips. The annular sidewalls are located at both ends of the width direction of the conveyor belt. The annular sidewalls on both sides and the multiple dividing strips together form multiple square units for physically separating seafood to achieve graded and orderly conveying. There are multiple support rollers, which roll and abut against the conveyor belt surface at both ends of the square units.

[0018] The baffles on the ramp frame effectively prevent seafood from flowing back during the initial ramping process due to conveyor belt startup or food accumulation, ensuring smooth loading. The grid units formed by the conveyor belt's annular sidewalls and separators physically separate the seafood, preventing collisions and stacking during ramping transport and ensuring orderly delivery. This not only prevents food damage but also ensures that each piece passes through the detection module individually during subsequent testing, avoiding blind spots caused by overlapping food and improving detection accuracy. The support rollers reduce belt deformation under load, ensuring smooth operation, extending belt lifespan, reducing noise during transport, improving the workshop working environment, and enhancing the overall operational stability and practicality of the equipment.

[0019] Furthermore, the sampling robotic arm has a base, a sampling robot rotatably mounted on the base, and a sampling driver for driving the sampling robot to rotate. The sampling robot has a sampling drive assembly rotatably mounted on the base and a sampling component connected to the drive end of the sampling drive assembly. The sampling driver drives the sampling robot to move the sampling component to sample seafood samples on the sampling delivery unit and the diversion unit.

[0020] The sampling robotic arm employs a multi-joint rotation design. Driven by a sampling actuator, the robot can rotate flexibly. Combined with the driving action of the sampling drive assembly, it can move the sampling components within a wide range, ensuring that the working area covers multiple conveyor lines and meets the sampling needs of different locations. This flexible structural design allows the sampling robotic arm to adapt to the layout of conveyor lines of different specifications, completing sampling without frequent adjustments to the equipment position, thus improving the equipment's adaptability. Simultaneously, mechanized sampling, replacing manual sampling, not only improves sampling efficiency but also avoids problems such as sample contamination and non-standard sampling that may occur during manual sampling. This ensures the objectivity and representativeness of the samples, providing a reliable basis for subsequent sample analysis and further guaranteeing the accuracy of the test results.

[0021] Furthermore, the sampling assembly has a sampling plate connected to the driving end of the sampling drive assembly. The sampling plate is provided with a reciprocating suction plate, a sampling cylinder for driving the reciprocating motion of the suction plate, a rotating gripper assembly, and a gripper driver for driving the gripper assembly to rotate. The gripper assembly has multiple L-shaped claw teeth arranged linearly. The gripper driver drives the gripper assembly to clamp the seafood sample, and the sampling cylinder drives the suction plate to cooperate with the gripper assembly to perform contact suction on the glass piece.

[0022] The sampling assembly's gripper component works in conjunction with the suction plate to achieve dual fixation of seafood samples. The linear arrangement of the L-shaped gripper teeth stably holds seafood of different shapes and sizes, preventing samples from falling during sampling. Driven by the sampling cylinder, the suction plate further aspirates the sample, especially effective for smooth or slippery seafood, enhancing the fixation and ensuring smooth sample transfer to the detection position. This dual fixation structure is highly adaptable and can handle various seafood such as shrimp, crab, and shellfish, solving the problem of easy sample drop with single-grip methods. Simultaneously, the precise drive of the gripper actuator and sampling cylinder controls the sampling force, preventing damage to the seafood sample due to excessive force, ensuring sample integrity, providing qualified samples for subsequent XRF spectral analysis, and improving the reliability and stability of the sampling process.

[0023] A smart detection method for metal nuclear radiation in seafood ingredients includes the following steps:

[0024] S1. Graded detection: Seafood ingredients are transported at high speed through the first detection conveyor line, and the first detection module is used to perform primary detection of metallic foreign objects and nuclear radiation contamination. The sensitivity of the primary detection is lower than the preset high sensitivity threshold.

[0025] S2. Secondary fine inspection: The seafood ingredients that have passed the primary inspection are transferred to the second inspection conveyor line, conveyed at low speed and subjected to high-sensitivity inspection by the second inspection module. The sensitivity of the high-sensitivity inspection is not lower than the preset high-sensitivity threshold.

[0026] S3. Dynamic diversion: Based on the real-time detection results of the first detection module and the second detection module, the unqualified seafood ingredients are introduced into the first NG conveyor line or the second NG conveyor line through the diversion unit;

[0027] S4. Random sampling analysis: Seafood samples are randomly picked up from the conveying and diversion units by a sampling robotic arm, and the content of metallic foreign matter and nuclear radiation elements in the samples is detected by an XRF spectrometer.

[0028] S5. Intelligent feedback adjustment: The intelligent control unit receives online detection data from the first detection module and the second detection module, as well as sample data from the XRF spectrometer in real time, and calculates the false detection rate and the false negative rate. If any indicator exceeds the preset threshold, the detection parameters of the first detection module or the second detection module are dynamically adjusted. The detection parameters are sensitivity, delivery speed and / or detection frequency.

[0029] This testing method achieves high efficiency, accuracy, and dynamic optimization in seafood testing through a closed-loop process of "graded testing - dynamic diversion - sampling verification - intelligent adjustment." In the graded testing stage, high-speed initial screening quickly filters out substandard products, while low-speed precision testing accurately identifies potential risks, balancing efficiency and accuracy. Dynamic diversion ensures timely separation of substandard products, avoiding cross-contamination. Random sampling analysis verifies the accuracy of online testing through quantitative data, providing double assurance for the reliability of results. Intelligent feedback adjustment optimizes testing parameters in real time based on data, solving parameter drift problems during long-term equipment operation and maintaining stable testing results. The entire method is highly automated, reducing manual intervention and human error, while comprehensively covering key aspects of the testing process. It effectively prevents the risks of metallic foreign objects and nuclear radiation contamination, providing a systematic testing solution for seafood food safety.

[0030] The beneficial effects of this invention are as follows: The equipment employs a tiered mode of high-speed initial inspection and low-speed fine inspection, ensuring both detection efficiency and accuracy; dual NG conveyor lines collect non-conforming products separately, facilitating traceability and processing; the inclined conveyor line enables automated loading and unloading, saving space and improving process smoothness; the initial inspection uses a Geiger counter detector and a single-frequency coil, while the fine inspection uses a NaI scintillator detector and a multi-frequency digital coil, balancing efficiency and accuracy; the sampling robotic arm performs multi-line random sampling combined with XRF spectral analysis to verify online detection and quantify the degree of contamination; the pushing mechanism quickly and accurately diverts non-conforming products; the grid unit and supporting rollers ensure stable and orderly conveying; the sampling component's clamping and suction combination ensures sample stability and integrity; the intelligent control unit calculates the false detection rate and false negative rate in real time, dynamically adjusts parameters, and forms a closed-loop optimization, comprehensively improving the reliability, stability, and automation level of seafood metal and nuclear radiation detection. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an intelligent metal nuclear radiation detection device and detection method for seafood ingredients according to the present invention. Figure One ;

[0032] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure Two ;

[0033] Figure 3 This is a schematic diagram of the detection conveyor line of the present invention;

[0034] Figure 4 This is a schematic diagram of the NG conveyor line of the present invention;

[0035] Figure 5 This is a schematic diagram of the inclined conveyor line of the present invention. Figure One ;

[0036] Figure 6 This is a schematic diagram of the inclined conveyor line of the present invention.Figure Two ;

[0037] Figure 7 This is a schematic diagram of the sampling robotic arm of the present invention;

[0038] Figure 8 This is a schematic diagram of the sampling component of the present invention;

[0039] Figure 9 This is a schematic diagram of the XRF spectrometer of the present invention.

[0040] The reference numerals in the attached drawings include: 1. Conveying unit; 2. Grading and detection unit; 3. Diversion unit; 4. Sample detection unit; 5. Intelligent control unit; 6. First detection conveyor line; 7. Second detection conveyor line; 8. First detection module; 9. Second detection module; 11. First NG conveyor line; 12. Second NG conveyor line; 13. NG base frame; 14. Drive belt; 15. NG driver; 16. Strip sidewall; 17. Regulator; 18. First inclined conveyor line; 19. Second inclined conveyor line; 21. Inclined base frame; 22. Conveyor belt; 23. Inclined driver; 24. First metal detector; 25. First nuclear radiation detector; 26. Second metal detector; 27. Second nuclear radiation detector; 28. Sampling robotic arm; 29. ​​XRF spectrometer; 31. Pushing mechanism; 32. Pushing cylinder; 33. Push plate; 34. Baffle; 35. Support roller; 36. Annular flange; 37. Separator; 38. Base; 39. Sampling robot; 41. Sampling driver; 42. Sampling drive assembly; 43. Sampling assembly; 44. Sampling plate; 45. Suction plate; 46. Suction cylinder; 47. Gripper assembly; 48. Gripper driver; 49. Gripper teeth; 51. Analytical rack; 52. Analytical interface; 53. X-ray emitting component; 54. X-ray detection component; 55. Sample storage chamber; 56. Sample support stage. Detailed Implementation

[0041] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0042] Please see Figures 1 to 9As shown, the present invention discloses an intelligent detection device for metal and nuclear radiation in seafood ingredients, comprising a conveying unit 1 for conveying seafood ingredients, a grading detection unit 2, a diversion unit 3, a sample detection unit 4, and an intelligent control unit 5. The grading detection unit 2 is used to grade and detect metal foreign objects and nuclear radiation contamination in the seafood ingredients on the conveying unit 1. The diversion unit 3, based on the detection results of the grading detection unit 2, diverts unqualified seafood ingredients. The sample detection unit 4 is used to sample seafood samples from the conveying unit 1 and the diversion unit 3 for analysis of metal foreign object and nuclear radiation element content. The conveying unit 1 includes a first detection conveying line 6 and a second detection conveying line 7 arranged sequentially, wherein the conveying speed of the first detection conveying line 6 is higher than that of the second detection conveying line 7. The conveying speed of the detection conveyor line 7 is monitored. The graded detection unit 2 includes a first detection module 8 disposed on the first detection conveyor line 6 and a second detection module 9 disposed on the second detection conveyor line 7. The detection sensitivity of the first detection module 8 is lower than a preset high sensitivity threshold, and the detection sensitivity of the second detection module 9 is not lower than the preset high sensitivity threshold. The intelligent control unit 5 is electrically connected to each unit to receive online detection data from the first detection module 8 and the second detection module 9, as well as sample detection data from the sample detection unit 4. The unit calculates the false detection rate and false detection rate of the two detection modules and adjusts the detection parameters of the first detection module 8 or the second detection module 9 when the false detection rate or false detection rate exceeds the preset threshold.

[0043] When the equipment is in operation, the intelligent control unit 5 first initializes the parameters of each unit, setting the first detection conveyor line 6 to high speed (e.g., 1.5 m / s) and the second detection conveyor line 7 to low speed (e.g., 0.5 m / s). When the seafood to be tested is conveyed through the first detection conveyor line 6, the first detection module 8 performs rapid screening with low sensitivity, achieving preliminary filtration of a large amount of food. After qualified food enters the second detection conveyor line 7, the second detection module 9 performs fine detection with high sensitivity, ensuring that no contaminants are missed. The intelligent control unit 5 collects online data from the two detection modules in real time, and simultaneously receives laboratory-level analysis data from the sample detection unit 4. It calculates the false detection rate (e.g., the proportion of qualified samples that are mistakenly judged as unqualified) and the missed detection rate (e.g., the proportion of unqualified samples that are not detected) through algorithms. When the missed detection rate exceeds the preset value (e.g., 0.5%), the sensitivity of the first detection module 8 can be increased or its conveying speed can be decreased; when the false detection rate exceeds the standard (e.g., 2%), the sensitivity of the second detection module 9 can be decreased or the conveyor line parameters can be adjusted, forming a closed-loop detection process of "coarse detection - fine detection - intelligent calibration".

[0044] Specifically, the diversion unit 3 includes a first NG conveyor line 11 connected to the first detection conveyor line 6 and a second NG conveyor line 12 connected to the second detection conveyor line 7. The first NG conveyor line 11 is used to receive seafood that fails the detection by the first detection module 8, and the second NG conveyor line 12 is used to receive seafood that fails the detection by the second detection module 9. The first NG conveyor line 11 includes an NG base frame 13, a transmission belt 14 rotatably mounted on the NG base frame 13, and an NG driver 15 that drives the transmission belt 14 to rotate. The NG base frame 13 is provided with a strip-shaped guard 16 and an adjuster 17 that adjusts the position of the strip-shaped guard 16 along the width direction of the transmission belt 14.

[0045] The diversion unit 3 achieves precise diversion based on the signal from the graded detection unit 2. When the first detection module 8 detects a defective product, the intelligent control unit 5 immediately sends a command to the pushing mechanism 31 of the first detection conveyor line 6 to push the defective product to the first NG conveyor line 11. The NG driver 15 of the first NG conveyor line 11 drives the transmission belt 14 to rotate, and the strip guard 16 acts as a guide to prevent the food from deviating from the conveying path. For seafood of different sizes, the strip guard 16 can be moved along the width direction of the transmission belt 14 by the adjuster 17 to adjust the width of the conveying channel (e.g., from 10cm to 15cm) to ensure stable conveying of the food. Similarly, defective products detected by the second detection module 9 are pushed to the second NG conveyor line 12. The two NG conveyor lines operate independently to avoid confusion between defective products of different detection levels, facilitate subsequent separate processing, and improve diversion efficiency and accuracy.

[0046] Specifically, the conveying unit 1 further includes a first inclined conveyor line 18 disposed at the front end of the first detection conveyor line 6 and a second inclined conveyor line 19 disposed at the rear end of the second detection conveyor line 7. The first inclined conveyor line 18 is used to convey the seafood ingredients to be tested to the first detection conveyor line 6, and the second inclined conveyor line 19 is used to convey the seafood ingredients that have passed the test by the second detection conveyor line 7 to the next process. The first inclined conveyor line 18 includes an inclined base frame 21, a conveyor belt 22 rotatably disposed on the inclined base frame 21, and an inclined driver 23 for driving the conveyor belt 22 to rotate. The conveyor belt 22 is inclinedly disposed on the inclined base frame 21, and the inclination angle of the conveyor belt 22 is 15°-30°.

[0047] The first inclined conveyor line 18 serves as the feeding end. Its inclined driver 23 drives the conveyor belt 22 to operate, with the inclination angle set between 15° and 30° (e.g., 20°). This angle allows the food to be transported to the higher first inspection conveyor line 6 while preventing it from sliding down due to gravity. The seafood to be inspected is placed on the conveyor belt 22 of the first inclined conveyor line 18 via a feeding device. The friction of the conveyor belt 22 overcomes the weight of the food, smoothly transporting it to the entrance of the first inspection conveyor line 6. The second inclined conveyor line 19 is located at the end of the inspection process. Seafood that has passed the second inspection module 9 enters the second inclined conveyor line 19, where the conveyor belt 22 transports it to the next process (such as cleaning or packaging). The inclined design achieves seamless connection between different processes, reduces manual transfer links, and improves the continuity of the automated production line.

[0048] Specifically, the first detection module 8 includes a first metal detector 24 and a first nuclear radiation detector 25, and the second detection module 9 includes a second metal detector 26 and a second nuclear radiation detector 27. The first nuclear radiation detector 25 is a Geiger counter detector, and the second nuclear radiation detector 27 is a NaI(Tl) scintillator detector. The first metal detector 24 is a single-frequency electromagnetic induction coil and its detection sensitivity is corresponding to the ability to detect ferromagnetic metal foreign objects of Φ1.0mm and above. The second metal detector 26 is a multi-frequency digital coil and its detection sensitivity is corresponding to the ability to detect non-ferromagnetic metal foreign objects of Φ0.3mm and above.

[0049] In the first detection module 8, the first metal detector 24 of the single-frequency electromagnetic induction coil generates an alternating magnetic field. When ferromagnetic metals of Φ1.0mm or larger are present in the seafood, the magnetic field is distorted, and the detector converts the magnetic signal into an electrical signal, which is then transmitted to the intelligent control unit 5 to achieve primary metal detection. The Geiger counter detector detects gamma rays through the gas ionization effect. When the radiation intensity exceeds the first threshold, it immediately issues a non-compliance signal. The multi-frequency digital coil metal detector of the second detection module 9 uses multiple frequencies (such as 100kHz and 500kHz) for detection and can identify non-ferromagnetic metals of Φ0.3mm or larger (such as copper and aluminum). The multi-frequency technology reduces the interference of the seafood's moisture and salt content on the detection results. The NaI(Tl) scintillator detector receives nuclear radiation particles and generates fluorescence, which is converted into an electrical signal by a photomultiplier tube. It can analyze the type of nuclide (such as Cs-137 and Co-60) and its radioactivity. When the level exceeds the second threshold, it is judged as non-compliance, achieving high-precision nuclear radiation detection.

[0050] Specifically, the sample detection unit 4 includes a sampling robotic arm 28 and an XRF spectrometer 29 disposed between the conveying unit 1 and the diversion unit 3. The working range of the sampling robotic arm 28 partially covers the first detection conveying line 6, the second detection conveying line 7, the first NG conveying line 11, and the second NG conveying line 12. It can randomly grab seafood samples on the sample conveying paths of the four conveying lines according to a preset program. The sampling robotic arm 28 transfers the grabbed seafood samples to the sample detection position of the XRF spectrometer 29. The XRF spectrometer 29 is used to detect the content of metallic foreign matter and nuclear radiation elements in the sample.

[0051] Sample detection unit 4 initiates sampling according to a preset cycle (e.g., every 30 minutes) or sampling ratio (e.g., 1 sample per 100 samples). Intelligent control unit 5 sends instructions to sampling robotic arm 28, which randomly selects sampling points on the four conveyor lines according to the program. For example, it prioritizes suspicious areas on the first detection conveyor line 6, non-conforming products on the second NG conveyor line 12, or qualified batch intervals on the second detection conveyor line 7. After the sampling robotic arm 28 grasps the seafood sample using gripper assembly 47, it transfers it to the sample carrier stage 56 of the XRF spectrometer 29. The XRF spectrometer 29 emits X-rays to excite the sample. Metallic foreign objects (such as mercury and lead) and nuclear radiation elements in the sample produce characteristic fluorescent X-rays. The detection component receives these and converts them into electrical signals, which are then processed by the analysis interface 52 to obtain elemental content data. This data serves as the basis for calibrating the online detection module, ensuring the accuracy of the overall detection results.

[0052] Specifically, both the first detection conveyor line 6 and the second detection conveyor line 7 are equipped with a pushing mechanism 31. The pushing mechanism 31 is used to push the unqualified seafood ingredients to the diversion unit 3. The pushing mechanism 31 includes a pushing cylinder 32 set on the detection conveyor line and a pusher plate 33 set on the output end of the pushing cylinder 32.

[0053] The pushing mechanism 31 works in conjunction with the grading detection unit 2 and the intelligent control unit 5. When the first detection module 8 detects a defective product, the intelligent control unit 5 immediately sends an electrical signal to the pushing cylinder 32 of the first detection conveyor line 6. The pushing cylinder 32 quickly extends its piston rod, driving the push plate 33 to move in a direction perpendicular to the conveyor line (e.g., a stroke of 5 cm), pushing the defective seafood from the conveyor line to the corresponding first NG conveyor line 11. After pushing is completed, the piston rod of the pushing cylinder 32 retracts, and the push plate 33 returns to its initial position, waiting for the next instruction. The pushing mechanism 31 on the second detection conveyor line 7 works on the same principle, pushing defective products detected by the second detection module 9. The push plate 33 is made of a flexible material (e.g., silicone) to avoid physical damage to the seafood. At the same time, the pushing cylinder 32 has a fast response speed (e.g., starting within 0.1 seconds), ensuring accurate diversion of defective products and not affecting the subsequent conveying and detection of food.

[0054] Specifically, the climbing frame 21 is provided with baffles 34 and rotating support rollers 35. The baffles 34 are located at the feeding end of the climbing frame 21 and above the conveyor belt 22 to prevent seafood ingredients from flowing back. The conveyor belt 22 is provided with annular sidewalls 36 along its length and multiple separators 37 are arranged thereon. The annular sidewalls 36 are located at both ends of the width direction of the conveyor belt 22. The annular sidewalls 36 on both sides and the multiple separators 37 together form multiple square units, which are used to physically separate seafood ingredients to achieve graded and orderly conveying. There are multiple support rollers 35, which roll and abut against the belt surface of the conveyor belt 22 at both ends of the square units.

[0055] The baffle 34 of the ramp frame 21 is located above the conveyor belt 22 at the loading end (e.g., 8cm high). When seafood is placed on the conveyor belt 22, the baffle 34 prevents the food from flowing back due to the inertia or gravity of the conveyor belt 22, ensuring smooth upward transport. The annular sidewall 36 (5cm high) of the conveyor belt 22 restricts the food in the width direction, preventing it from falling from both sides. The separator strips 37 are evenly arranged along the length direction (e.g., 10cm spacing), forming square units (e.g., 10cm × 15cm) with the annular sidewall 36. Each square unit can hold a certain amount of seafood, achieving physical separation of the food and avoiding stacking that could lead to blind spots in detection. The support rollers 35 roll against the conveyor belt 22 at both ends of the square unit, supporting the conveyor belt 22 to prevent it from sagging and deforming due to the weight of the food, and reducing the friction of the conveyor belt 22 during operation, thus reducing the load on the ramp driver 23, extending the service life of the equipment, and ensuring smooth transport.

[0056] Specifically, the sampling robotic arm 28 has a base 38, a sampling robot 39 rotatably mounted on the base 38, and a sampling driver 41 for driving the sampling robot 39 to rotate. The sampling robot 39 has a sampling drive assembly 42 rotatably mounted on the base 38 and a sampling assembly 43 connected to the drive end of the sampling drive assembly 42. The sampling driver 41 drives the sampling robot 39 to move the sampling assembly 43 to sample the seafood samples on the conveying unit 1 and the diversion unit 3.

[0057] During sampling, the intelligent control unit 5 sends a command to the sampling driver 41, which drives the sampling robot 39 to rotate on the base 38 (e.g., 360° rotation), adjusting the horizontal position of the sampling component 43. The sampling drive component 42 (e.g., a multi-joint robotic arm) drives each joint to rotate via motors, moving the sampling component 43 vertically and horizontally to achieve precise positioning of sampling points on different conveyor lines. Once the sampling component 43 reaches the designated position, the sampling drive component 42 fine-tunes its height to bring it close to the seafood sample, and then the sample is grasped by the gripper component 47 or the suction plate 45. After sampling, the sampling drive component 42 drives the sampling component 43 to reset, and the sampling robot 39 rotates to the direction of the XRF spectrometer 29, transferring the sample to the detection position. The entire process is controlled by a servo motor, achieving a positioning accuracy of ±0.5mm, ensuring accurate and efficient sampling.

[0058] Specifically, the sampling component 43 has a sampling plate 44 connected to the driving end of the sampling driving component 42. The sampling plate 44 is provided with a reciprocating suction plate 45, a sampling cylinder for driving the suction plate 45 to reciprocate, a rotating gripper assembly 47, and a gripper driver 48 for driving the gripper assembly 47 to rotate. The gripper assembly 47 has a plurality of linearly arranged L-shaped claw teeth 49. The gripper driver 48 drives the gripper assembly 47 to clamp the seafood sample. The sampling cylinder drives the suction plate 45 to cooperate with the gripper assembly 47 to abut and suck up the glass piece.

[0059] The sampling component 43 selects the clamping or aspiration method according to the shape of the seafood sample (e.g., block or sheet). For block seafood (e.g., scallops, shrimp), the gripper actuator 48 drives the gripper assembly 47 to rotate to a suitable angle, and multiple L-shaped teeth 49 (e.g., 3-5) open, adhere to the sample surface, and then close, using the friction between the teeth 49 to firmly clamp the sample and prevent it from falling. For thinner or more fragile seafood samples (e.g., fish fillets), the sampling cylinder drives the aspiration plate 45 to extend forward, adhere to the sample surface, and aspirate the sample through negative pressure adsorption (e.g., vacuum degree -0.08MPa). At the same time, the gripper assembly 47 slightly closes to assist in fixation and prevent the sample from shifting during transport. After sampling, the gripper assembly 47 opens, the aspiration plate 45 releases the negative pressure, and the sample is placed on the sample support stage 56 of the XRF spectrometer 29. The two sampling methods are used in combination to adapt to different types of seafood samples, improving the versatility and reliability of sampling.

[0060] A smart detection method for metal nuclear radiation in seafood ingredients includes the following steps:

[0061] S1. Graded detection: Seafood ingredients are transported at high speed through the first detection conveyor line 6, and the first detection module 8 is used to perform primary detection of metallic foreign objects and nuclear radiation contamination. The sensitivity of the primary detection is lower than the preset high sensitivity threshold.

[0062] S2. Secondary fine inspection: The seafood ingredients that have passed the primary inspection are transferred to the second inspection conveyor line 7, conveyed at low speed and subjected to high-sensitivity inspection by the second inspection module 9. The sensitivity of the high-sensitivity inspection is not lower than the preset high-sensitivity threshold.

[0063] S3. Dynamic diversion: Based on the real-time detection results of the first detection module 8 and the second detection module 9, the unqualified seafood ingredients are respectively introduced into the first NG conveyor line 11 or the second NG conveyor line 12 through the diversion unit 3;

[0064] S4. Random Sampling Analysis: The sampling robotic arm 28 randomly grabs seafood samples from the conveying unit 1 and the diversion unit 3, and the XRF spectrometer 29 is used to detect the content of metallic foreign objects and nuclear radiation elements in the samples; S5. Intelligent Feedback Adjustment: The intelligent control unit 5 receives online detection data from the first detection module 8 and the second detection module 9 and sample data from the XRF spectrometer 29 in real time, calculates the false detection rate and the false negative rate, and dynamically adjusts the detection parameters of the first detection module 8 or the second detection module 9 if any index exceeds the preset threshold. The detection parameters are sensitivity, conveying speed and / or detection frequency.

[0065] The testing method proceeds step-by step according to the process. In S1, the first testing conveyor line 6 transports materials at high speed (e.g., 1.2 m / s), and the first testing module 8 quickly screens for large metal particles and high-dose radiation, achieving preliminary filtration. In S2, qualified ingredients are transferred to the second testing conveyor line 7 and transported at low speed (e.g., 0.4 m / s). The second testing module 9 detects small metal particles and low-dose radiation with high sensitivity, ensuring testing accuracy. In S3, the diversion unit 3 operates in real time based on the test results, and unqualified products are sent to their corresponding NG conveyor lines. In S4, random sampling is performed according to preset rules, and the XRF spectrometer 29 provides accurate elemental content data as a calibration basis. In S5, the intelligent control unit 5 calculates the false detection rate and the missed detection rate by comparing online detection data with sample analysis data. If the missed detection rate exceeds 0.5%, the sensitivity of the first detection module 8 is increased (e.g., the lower limit of metal detection is adjusted from Φ1.0mm to Φ0.8mm) or its conveying speed is reduced. If the false detection rate exceeds 2%, the sensitivity of the second detection module 9 is reduced or the spacing of the conveyor line separator 37 is increased. Through dynamic adjustment, the detection performance is continuously optimized, taking into account both efficiency and accuracy.

[0066] In this embodiment, the primary detection of the first detection module 8 in S1 includes detecting ferromagnetic metals of Φ1.0mm and above using a single-frequency electromagnetic induction coil, and detecting whether the gamma-ray radiation intensity exceeds a first threshold using a Geiger counter detector; the high-sensitivity detection of the second detection module 9 in S2 includes detecting non-ferromagnetic metals of Φ0.3mm and above using a multi-frequency digital coil, and analyzing whether the nuclide type and radioactivity exceed a second threshold using a NaI(Tl) scintillator detector; in S4, the sampling robotic arm 28 randomly grabs seafood samples from the conveying unit 1 and the diversion unit 3, prioritizing suspicious areas on the first detection conveying line 6 that are not identified by the first detection module 8, samples judged as unqualified on the second NG conveying line 12, or interval sampling points in the continuously qualified batches on the second detection conveying line 7, and uses an XRF spectrometer 29 to detect the content of metallic foreign matter and nuclear radiation elements in the samples;

[0067] In S5, the intelligent control unit 5 receives online detection data from the first detection module 8 and the second detection module 9, as well as sample data from the XRF spectrometer 29 in real time, and calculates the false detection rate and the missed detection rate. If the missed detection rate exceeds the standard, the sensitivity of the first detection module 8 is increased or the speed of the first detection conveyor line 6 is reduced. If the false detection rate exceeds the standard, the sensitivity of the second detection module 9 is reduced or the spacing of the separator strips 37 of the second detection conveyor line 7 is increased. S6, post-processing: The seafood diverted to the first NG conveyor line 11 is manually re-inspected. If the re-inspection is qualified, it is put back into the second detection conveyor line 7. The seafood diverted to the second NG conveyor line 12 is subjected to radionuclide half-life analysis. If the radioactivity is lower than the safety standard, it is marked as a processable product.

[0068] In the S1 primary detection, a single-frequency electromagnetic induction coil generates a fixed-frequency magnetic field. Ferromagnetic metals with a diameter of 1.0 mm or larger will cause changes in the magnetic field. A Geiger counter detector counts gamma-ray pulses, and if the pulse exceeds the first threshold (e.g., 0.2 μSv / h), the sample is deemed unqualified. In the S2 high-sensitivity detection, a multi-frequency digital coil switches between different frequencies to detect non-ferromagnetic metals with a diameter of 0.3 mm or larger. A NaI(Tl) scintillator detector analyzes the type and activity of nuclides through fluorescence intensity and wavelength. If the pulse exceeds the second threshold (e.g., 0.1 μSv / h), the sample is deemed unqualified. In the S4 sampling process, priority is given to suspicious areas (e.g., food ingredients at the edge of the conveyor line), unqualified products, and intervals between qualified batches to ensure sample representativeness. An XRF spectrometer 29 quantitatively analyzes the content of metallic foreign matter (e.g., mercury ≤ 0.5 mg / kg) and nuclear radiation elements through characteristic fluorescence spectra.

[0069] When the false negative rate exceeds the standard in S5, the sensitivity of the first detection module 8 is increased or the conveying speed is reduced (e.g., from 1.5m / s to 1.0m / s); when the false positive rate exceeds the standard, the sensitivity of the second detection module 9 is reduced or the spacing of the separators 37 is increased (e.g., from 10cm to 12cm). In the post-processing of S6, non-conforming products from the first NG conveyor line 11 are manually re-inspected, and those that pass are returned to the second detection line; non-conforming products from the second NG conveyor line 12 are analyzed by radionuclide half-life analysis, and if the activity meets the standard, they are marked as reprocessable, thus avoiding resource waste and ensuring food safety.

[0070] In this embodiment, the XRF spectrometer 29 has an analysis frame 51, an analysis interface 52 disposed on the analysis frame 51, an X-ray emitting component 53, an X-ray detection component 54, a sample storage chamber 55, and a sample support stage 56. The X-ray emitting component 53 and the X-ray detection component 54 are both electrically connected to the analysis interface 52. The X-ray emitting component 53 is used to emit X-rays to excite the seafood sample located on the sample support stage 56 to generate characteristic fluorescent X-rays. The X-ray detection component 54 is used to receive the characteristic fluorescent X-rays, convert them into electrical signals, and transmit them to the analysis interface 52.

[0071] When the XRF spectrometer 29 is working, the operator sets the detection parameters (e.g., detection time 20s) through the analysis interface 52. The X-ray emitting component 53 (e.g., an X-ray tube) emits high-energy X-rays to irradiate the seafood sample on the sample support stage 56. Atoms in the sample are excited, and inner-shell electron transitions produce characteristic fluorescent X-rays. Different elements produce characteristic fluorescent X-rays with different wavelengths and energies. The X-ray detection component 54 (e.g., a Si-PIN detector) receives these characteristic fluorescent X-rays, converts them into electrical signals, and transmits the amplified and filtered signals to the analysis interface 52. The analysis interface 52 has a built-in elemental analysis algorithm that calculates the content of various metallic foreign matter (e.g., lead, cadmium) and nuclear radiation elements (e.g., Cs-137) in the sample based on the energy and intensity of the electrical signals. The detection results are displayed on the interface, and the data is simultaneously uploaded to the intelligent control unit 5, providing an accurate basis for adjusting the parameters of the detection module. The sample storage cavity 55 can temporarily store samples to be detected or already detected, facilitating batch processing.

[0072] The working principle of this invention is as follows: Highly efficient and accurate detection is achieved through a core process of "graded detection - dynamic diversion". Seafood ingredients to be tested are first smoothly conveyed to the first detection conveyor line 6 via the first inclined conveyor line 18. They undergo primary screening at high speed (e.g., 1.5 m / s) through the first detection module 8. A single-frequency electromagnetic induction coil detects ferromagnetic metals of Φ1.0 mm and above, and a Geiger counter detector monitors gamma-ray radiation intensity, quickly filtering out obviously unqualified products. Ingredients that pass the primary detection are transferred to the second detection conveyor line 7, where they undergo high-sensitivity fine inspection at low speed (e.g., 0.5 m / s) through the second detection module 9. A multi-frequency digital coil identifies non-ferromagnetic metals of Φ0.3 mm and above, and a NaI(Tl) scintillator detector analyzes the type of nuclide and its radioactivity. Based on the results of the two-stage detection, the diversion unit 3, through the pushing mechanism 31, guides unqualified products to their corresponding NG conveyor lines, while qualified products are conveyed to the next process via the second inclined conveyor line 19, forming a fully automated detection chain from feeding to diversion.

[0073] The coordinated operation of each unit of the equipment forms a multi-layered protection system. The sampling robotic arm 28 randomly samples from the conveying unit 1 and the diversion unit 3 according to preset rules, prioritizing suspicious areas, non-conforming products, and intervals between qualified batches. Using a combination of grippers and suction plates 45, it adapts to different shapes of seafood and transfers the samples to the XRF spectrometer 29. The XRF spectrometer 29 emits X-rays to excite the samples, generating characteristic fluorescent X-rays that accurately detect metallic foreign objects and the content of nuclear radiation elements, providing laboratory-level calibration data for the online detection module. Meanwhile, the grid unit design of the inclined conveyor line and the adjustable sidewalls of the NG conveyor line ensure that there is no stacking or offset during the food transport process. The flexible push plate 33 and the rapid-response cylinder of the pushing mechanism 31 ensure accurate diversion without damaging the food. The various components work together in terms of mechanical structure and function to improve the stability and reliability of the detection.

[0074] The intelligent control unit 5 acts as the core hub, implementing a dynamic optimization closed loop. It receives real-time online detection data from the first and second detection modules 9 and sample analysis data from the XRF spectrometer 29, calculating the false detection rate and false negative rate using algorithms. When the false negative rate exceeds a preset threshold (e.g., 0.5%), it automatically increases the sensitivity of the first detection module 8 or reduces its conveying speed; if the false negative rate exceeds the standard (e.g., 2%), it reduces the sensitivity of the second detection module 9 or adjusts the spacing of the conveyor line separators 37. Simultaneously, the post-processing stage manually re-inspects non-conforming products from the first NG conveyor line 11, returning qualified products to the detection process. For non-conforming products from the second NG conveyor line 12, it performs radionuclide half-life analysis, marking qualified products as processable. Through this "detection-sampling-analysis-adjustment" cyclical mechanism, the equipment continuously optimizes detection parameters, balancing detection efficiency and accuracy to ensure the safety and quality of seafood.

[0075] In this embodiment, the conveyor belts 22 of the first detection conveyor line 6, the second detection conveyor line 7, and the inclined conveyor line adopt a stainless steel mesh structure, with a sealed water tank (10-15cm deep) at the bottom. The lower half of the conveyor belt is immersed in low-temperature (4-8℃) circulating water, while the upper half is exposed to air, keeping the seafood moist during the detection process. A refrigeration unit is integrated into the water tank, and an oxygen tank integrates a refrigeration unit, an oxygen pump (dissolved oxygen ≥6mg / L), and a filtration system to maintain water cleanliness and low temperature. Transparent baffles (20cm high) are installed on both sides of the conveyor belt to prevent water splashing, and observation windows are provided at the top of the baffles for easy access to the detection module. The metal detector is sealed with epoxy resin, and the nuclear radiation detector is also sealed with resin. The nuclear radiation detector is adapted for underwater detection through a waterproof probe and a sapphire window to reduce false alarms.

[0076] In this embodiment, the tanks of the first NG conveyor line 11 and the second NG conveyor line 12 are equipped with compartmentalized temporary holding areas (20cm×20cm / compartment) and independent oxygen supply pipes, allowing substandard seafood to be temporarily held for 24-48 hours. The pushing mechanism uses a silicone-coated pusher plate 33, driven by a servo motor (speed 0.1-0.5m / s), reducing damage to live seafood. The intelligent control unit 5 integrates water temperature and dissolved oxygen sensors to dynamically adjust cooling and oxygen supply. When a decrease in seafood activity is detected (such as sluggish movement), the conveying speed is automatically reduced or an oxygenation spray is triggered. The end of the second NG conveyor line 12 is connected to a lead-shielded treatment tank. Seafood with excessive radioactivity is transferred to the tank via a robotic arm, and ion exchange resin is added to the tank water to adsorb radionuclides, achieving safe disposal.

[0077] The two implementation methods work together to achieve a closed loop of "detection-temporary holding-re-detection", which ensures the accuracy of detection and increases the survival rate of seafood to ≥98%, and is especially suitable for high-value live products (such as lobster and abalone).

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A smart metal nuclear radiation detection device for seafood ingredients, characterized in that: The system includes a conveying unit (1) for conveying seafood ingredients, a grading and detection unit (2), a diversion unit (3), a sample detection unit (4), and an intelligent control unit (5). The grading and detection unit (2) is used to grade and detect the seafood ingredients on the conveying unit (1) for metal foreign matter and nuclear radiation contamination. The diversion unit (3) diverts unqualified seafood ingredients according to the detection results of the grading and detection unit (2). The sample detection unit (4) is used to sample seafood samples on the conveying unit (1) and the diversion unit (3) for metal foreign matter and nuclear radiation element content analysis. The conveying unit (1) includes a first detection conveying line (6) and a second detection conveying line (7) arranged in sequence. The conveying speed of the first detection conveying line (6) is higher than that of the second detection conveying line (7). The graded detection unit (2) includes a first detection module (8) disposed on the first detection conveying line (6) and a second detection module (9) disposed on the second detection conveying line (7). The detection sensitivity of the first detection module (8) is lower than a preset high sensitivity threshold, and the detection sensitivity of the second detection module (9) is not lower than the preset high sensitivity threshold. The intelligent control unit (5) is electrically connected to each unit to receive online detection data from the first detection module (8) and the second detection module (9) and sample detection data from the sample detection unit (4), calculate the false detection rate and false detection rate of the two detection modules, and adjust the detection parameters of the first detection module (8) or the second detection module (9) when the false detection rate or false detection rate exceeds the preset threshold.

2. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 1, characterized in that: The diversion unit (3) includes a first NG conveyor line (11) connected to the first detection conveyor line (6) and a second NG conveyor line (12) connected to the second detection conveyor line (7). The first NG conveyor line (11) is used to receive seafood that fails the detection of the first detection module (8), and the second NG conveyor line (12) is used to receive seafood that fails the detection of the second detection module (9). The first NG conveyor line (11) includes an NG base frame (13), a transmission belt (14) rotatably disposed on the NG base frame (13), and an NG driver (15) for driving the transmission belt (14) to rotate. The NG base frame (13) is provided with a strip-shaped guard (16) and an adjuster (17) for adjusting the position of the strip-shaped guard (16) along the width direction of the transmission belt (14).

3. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 1, characterized in that: The conveying unit (1) further includes a first ramp conveyor line (18) located at the front end of the first detection conveyor line (6) and a second ramp conveyor line (19) located at the rear end of the second detection conveyor line (7). The first ramp conveyor line (18) is used to convey the seafood ingredients to be tested to the first detection conveyor line (6), and the second ramp conveyor line (19) is used to convey the seafood ingredients that have passed the test by the second detection conveyor line (7) to the next process. The first ramp conveyor line (18) includes a ramp base frame (21), a conveyor belt (22) rotatably mounted on the ramp base frame (21), and a ramp driver (23) for driving the conveyor belt (22) to rotate. The conveyor belt (22) is inclined on the ramp base frame (21), and the inclination angle of the conveyor belt (22) is 15°-30°.

4. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 1, characterized in that: The first detection module (8) includes a first metal detector (24) and a first nuclear radiation detector (25), and the second detection module (9) includes a second metal detector (26) and a second nuclear radiation detector (27). The first nuclear radiation detector (25) is a Geiger counter detector, and the second nuclear radiation detector (27) is a NaI(Tl) scintillator detector. The first metal detector (24) is a single-frequency electromagnetic induction coil and its detection sensitivity is corresponding to the ability to detect ferromagnetic metal foreign objects of Φ1.0mm and above. The second metal detector (26) is a multi-frequency digital coil and its detection sensitivity is corresponding to the ability to detect non-ferromagnetic metal foreign objects of Φ0.3mm and above.

5. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 1, characterized in that: The sample detection unit (4) includes a sampling robotic arm (28) and an XRF spectrometer (29) disposed between the conveying unit (1) and the diversion unit (3). The working range of the sampling robotic arm (28) partially covers the first detection conveying line (6), the second detection conveying line (7), the first NG conveying line (11) and the second NG conveying line (12). It can randomly grab seafood samples on the sample conveying paths of the four conveying lines according to a preset program. The sampling robotic arm (28) transfers the grabbed seafood samples to the sample detection position of the XRF spectrometer (29). The XRF spectrometer (29) is used to detect the content of metallic foreign matter and nuclear radiation elements in the sample.

6. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 1, characterized in that: The first detection conveyor line (6) and the second detection conveyor line (7) are both equipped with a pushing mechanism (31). The pushing mechanism (31) is used to push the unqualified seafood ingredients to the diversion unit (3). The pushing mechanism (31) includes a pushing cylinder (32) set on the detection conveyor line and a push plate (33) set on the output end of the pushing cylinder (32).

7. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 3, characterized in that: The climbing frame (21) is provided with a baffle (34) and rotating support rollers (35). The baffle (34) is located at the feeding end of the climbing frame (21) and above the conveyor belt (22) to prevent seafood ingredients from flowing back. The conveyor belt (22) is provided with annular sidewalls (36) along its length and multiple separators (37) are arranged. The annular sidewalls (36) are located at both ends of the width direction of the conveyor belt (22). The annular sidewalls (36) on both sides and the multiple separators (37) together form multiple square units for physically separating seafood ingredients to achieve graded and orderly conveying. There are multiple support rollers (35). The multiple support rollers (35) roll and abut against the belt surface of the conveyor belt (22) at both ends of the square unit.

8. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 5, characterized in that: The sampling robotic arm (28) has a base (38), a sampling robot (39) rotatably mounted on the base (38), and a sampling driver (41) for driving the sampling robot (39) to rotate. The sampling robot (39) has a sampling drive assembly (42) rotatably mounted on the base (38) and a sampling assembly (43) connected to the drive end of the sampling drive assembly (42). The sampling driver (41) drives the sampling robot (39) to take seafood samples from the sampling conveying unit (1) and the diversion unit (3) of the sampling assembly (43).

9. The intelligent detection device for metal nuclear radiation in seafood ingredients according to claim 8, characterized in that: The sampling assembly (43) has a sampling plate (44) connected to the driving end of the sampling drive assembly (42). The sampling plate (44) is provided with a reciprocating suction plate (45), a sampling cylinder for driving the suction plate (45) to reciprocate, a rotating gripper assembly (47), and a gripper driver (48) for driving the gripper assembly (47) to rotate. The gripper assembly (47) has multiple L-shaped claw teeth (49) arranged linearly. The gripper driver (48) drives the gripper assembly (47) to hold the seafood sample. The sampling cylinder drives the suction plate (45) to cooperate with the gripper assembly (47) to abut and suck up the glass piece.

10. The intelligent detection method for metal nuclear radiation in seafood ingredients according to claim 1, characterized in that: Includes the intelligent metal nuclear radiation detection device for seafood ingredients according to any one of claims 1-9 and the following steps: S1. Graded detection: Seafood ingredients are transported at high speed through the first detection conveyor line (6), and the first detection module (8) is used to perform primary detection of metal foreign objects and nuclear radiation contamination. The sensitivity of the primary detection is lower than the preset high sensitivity threshold. S2. Secondary fine inspection: The seafood ingredients that pass the primary inspection are transferred to the second inspection conveyor line (7), conveyed at low speed and subjected to high-sensitivity inspection by the second inspection module (9), the sensitivity of which is not lower than the preset high-sensitivity threshold; S3. Dynamic diversion: According to the real-time detection results of the first inspection module (8) and the second inspection module (9), the unqualified seafood ingredients are introduced into the first NG conveyor line (11) or the second NG conveyor line (12) respectively through the diversion unit (3); S4. Random sampling analysis: Seafood samples are randomly picked up from the conveying unit (1) and the diversion unit (3) by the sampling robotic arm (28), and the content of metallic foreign matter and nuclear radiation elements in the samples is detected by the XRF spectrometer (29); S5. Intelligent feedback adjustment: The intelligent control unit (5) receives the online detection data of the first detection module (8) and the second detection module (9) and the sample data of the XRF spectrometer (29) in real time, calculates the false detection rate and the missed detection rate, and dynamically adjusts the detection parameters of the first detection module (8) or the second detection module (9) if any index exceeds the preset threshold. The detection parameters are sensitivity, delivery speed and / or detection frequency.

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