Full-automatic plate thickness measuring and sorting device

Abstract

The application discloses a kind of full-automatic plate thickness measuring sorting devices, it is related to plate automation detection technical field.The device includes the conveying mechanism, thickness measuring mechanism, sorting mechanism and controller sequentially arranged along the conveying direction;Thickness measuring mechanism uses laser displacement sensor to carry out non-contact thickness detection, and sorting mechanism includes main conveying belt and multiple sorting conveying belts on both sides of main conveying belt, and lateral conveying carrier roller is arranged in main conveying belt.System is integrated in controller, including data acquisition module, data processing module and execution control module, and multiple-point sampling unit and mean value calculation unit are built-in in data processing module, realize multi-position thickness acquisition and comprehensive grade determination.The application realizes the full-process automation of plate from conveying, thickness measuring to multi-grade sorting, with the advantages of high detection accuracy, high sorting efficiency, reliable operation and the like.

Description

Technical Field

[0001] This invention relates to the field of automated inspection and sorting technology for sheet materials, specifically to a fully automated sheet material thickness measuring and sorting device. Background Technology

[0002] Sheet thickness is a key indicator of sheet quality, directly affecting subsequent processing and product performance. Traditional methods rely heavily on manual measurement and marking of each sheet using handheld tools, followed by transport to a designated area. This is not only labor-intensive and inefficient, but manual measurement also only captures localized edge data, failing to reflect the overall thickness distribution of the sheet, resulting in poor accuracy and consistency, and failing to meet the quality control requirements of modern production lines. In recent years, some companies have begun to introduce automated testing or sorting equipment; however, most of this equipment separates testing and sorting functions, resulting in low integration. Furthermore, it suffers from problems such as contact measurement easily damaging the sheet surface, slow response of the sorting mechanism, and control systems that can only perform simple logical judgments. It lacks support for intelligent functions such as multi-level fine sorting, in-depth data processing, and closed-loop feedback correction. Overall, the technical level still cannot effectively address the practical production needs that demand both efficiency and accuracy.

[0003] Therefore, this solution proposes a fully automatic sheet metal thickness measurement and sorting device to solve the above problems. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the purpose of this invention is to provide a fully automatic plate thickness measurement and sorting device.

[0005] To achieve the aforementioned objective, the technical solution of the present invention is implemented as follows: a fully automatic sheet metal thickness measuring and sorting device, comprising: A conveying mechanism, a thickness measuring mechanism, and a sorting mechanism are arranged sequentially along the conveying direction of the sheet metal, and a controller is electrically connected to the conveying mechanism, the thickness measuring mechanism, and the sorting mechanism respectively; The conveying mechanism includes a main conveyor belt, which is used to transport the plates to be tested sequentially to the thickness measurement station and the sorting station; The controller includes a control host, which has a built-in processor module and a storage module for storing thickness grading standards; The thickness measuring mechanism is set at the thickness measuring station to measure the thickness of the passing sheet metal and generate a thickness measurement signal. The sorting mechanism is set at the sorting station and includes several sorting conveyor belts distributed on both sides of the main conveyor belt. Each sorting conveyor belt corresponds to a different thickness grade output channel. Side conveyor rollers are installed inside the main conveyor belt. These side conveyor rollers are used to convey the sheet material to the side onto the corresponding sorting conveyor belt when the sheet material reaches a specific position. The controller receives the thickness detection signal generated by the thickness measuring mechanism, calls the thickness grading standard stored in the storage module, generates sorting control instructions through the processor module, and outputs them to the sorting mechanism to control the sorting conveyor belt corresponding to the current plate thickness grade to receive the plate conveyed by the lateral conveying rollers and push the plate along the conveying direction to the corresponding output channel.

[0006] Furthermore, the thickness measuring mechanism includes at least one set of laser displacement sensors disposed above and below the sheet material conveying path. The laser displacement sensors are used to non-contactly measure the distance between the upper and lower surfaces of the sheet material to obtain the sheet material thickness value.

[0007] Furthermore, the emission beams of the two sets of laser displacement sensors are coaxially arranged. By measuring the distances from the sensors to the upper and lower surfaces of the material using the two coaxially arranged laser displacement sensors, the actual thickness of the material can be calculated by subtracting the two measured distances from the known sensor spacing. The laser displacement sensor employs the principle of laser triangulation. The laser beam emitted by the semiconductor laser is reflected from the surface of the object being measured, then projected onto the terminal CCD through a lens. The distance from the sensor to the surface of the object is obtained by calculating the position of the light spot.

[0008] Furthermore, the sorting conveyor belt is equipped with active roller sets along the conveying direction. The active roller sets are used to push the plates received on the sorting conveyor belt to the corresponding output channels along the conveying direction.

[0009] A fully automatic sheet metal thickness measurement and sorting system is applied to the aforementioned fully automatic sheet metal thickness measurement and sorting device. The sorting system is integrated into the controller and includes: The data acquisition module is used to receive the plate thickness detection signal collected by the thickness measuring mechanism, and to perform signal conditioning and analog-to-digital conversion on the thickness detection signal to generate a digital signal of plate thickness. The data processing module is connected to the data acquisition module and is used to receive digital signals of the board thickness, determine the thickness grade of the current board according to the preset thickness grading standard, and generate a sorting and judgment result containing the board thickness grade information. The execution control module is connected to the data processing module to receive the sorting judgment result, generate the corresponding sorting execution command based on the thickness grade information in the sorting judgment result, and output the sorting execution command to the sorting mechanism to control the sorting conveyor belt corresponding to the current plate thickness grade to receive the plate conveyed by the lateral conveying roller and convey the plate to the output channel corresponding to the thickness grade.

[0010] Furthermore, the data processing module includes: The thickness calculation unit is used to calculate the actual thickness value of the current plate based on the digital signal of the plate thickness. The standard storage unit is used to store the preset thickness grading standard, which includes multiple thickness grade ranges and their corresponding sorting channel information. The grade determination unit is connected to the thickness calculation unit and the standard storage unit respectively. It is used to compare the actual thickness value with the thickness grading standard, determine the thickness grade of the current board, and generate the sorting determination result.

[0011] Furthermore, the data processing module also includes: A multi-point sampling unit is used to collect thickness data at multiple measurement locations on a single sheet material, generating a multi-point thickness dataset; The mean calculation unit, connected to the multi-point sampling unit, is used to perform statistical calculations on the multi-point thickness dataset to generate the average thickness value and thickness uniformity index of the current plate. The grade determination unit makes a comprehensive thickness grade determination based on the average thickness value and the thickness uniformity index.

[0012] Furthermore, the fully automated sheet metal thickness measurement and sorting system also includes: The feedback correction module is connected to the data processing module and the execution control module respectively. It is used to obtain the actual sorting result after the sorting mechanism performs the sorting action, compare the actual sorting result with the sorting judgment result, and generate a correction signal when the two are inconsistent and feed it back to the execution control module. The execution control module corrects the subsequent plate sorting execution instructions according to the correction signal.

[0013] Furthermore, the fully automated sheet metal thickness measurement and sorting system also includes: The human-computer interaction module, connected to the data processing module, provides an interface for setting and modifying thickness grading standards, displays the current thickness detection data and sorting results of the board in real time, and outputs statistical reports of historical detection data.

[0014] Furthermore, the fully automated sheet metal thickness measurement and sorting system also includes: The abnormal alarm module is connected to the data processing module. When the data processing module determines that the thickness of the current board exceeds the preset thickness threshold range, it generates an alarm signal and triggers an alarm prompt.

[0015] Furthermore, the data acquisition module, data processing module, and execution control module are integrated into the controller. The data acquisition module is connected to the thickness measuring mechanism through an analog input interface or a digital communication interface, and the execution control module is connected to the sorting mechanism through a digital output interface or a fieldbus.

[0016] The beneficial effects of this invention are reflected in: This invention achieves full automation of the entire process of sheet metal conveying, non-contact laser thickness measurement, and multi-level automatic sorting, significantly reducing manual intervention and greatly improving production efficiency and sorting consistency. It employs a laser displacement sensor for non-contact measurement, avoiding scratches on the sheet surface while offering high measurement accuracy and fast response. Combined with multi-point sampling and mean calculation, it effectively eliminates random errors, making thickness determination more accurate. The structural design of the main conveyor belt, along with side rollers and multiple independent sorting conveyor belts, allows for flexible configuration of multiple thickness level output channels as needed, achieving fine grading. The system has a built-in feedback correction module that can compare and correct actual sorting results in real time, forming a closed-loop control system with high long-term operational reliability. Simultaneously, the human-machine interface supports flexible setting of grading standards, real-time data display, and historical report output. An anomaly alarm function can promptly warn of out-of-tolerance products, significantly improving the overall intelligence level of the equipment and the convenience of production management. Attached Figure Description

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the fully automatic sheet metal thickness measuring and sorting device of the present invention; Figure 2 This is a block diagram of the overall sorting system structure of the present invention; Figure 3 This is a flowchart of the sorting method control of the present invention.

[0018] The markings in the diagram are explained as follows: 10—Conveying mechanism; 20—Thickness measuring mechanism; 21—Laser displacement sensor; 30—Sorting mechanism; 40—Controller; 50—Side conveying roller. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] Please refer to the instruction manual appendix. Figures 1-3 The present invention provides a fully automatic plate thickness measurement and sorting device, which includes a conveying mechanism 10, a thickness measuring mechanism 20, a sorting mechanism 30 arranged sequentially along the plate conveying direction, and a controller 40 electrically connected to the conveying mechanism 10, the thickness measuring mechanism 20 and the sorting mechanism 30 respectively.

[0021] The conveying mechanism 10 includes a main conveyor belt, which consists of a drive motor, a drive roller, a driven roller, and the conveyor belt body. It is used to sequentially convey the plates to be tested to the thickness measurement station and the sorting station. The conveying speed of the main conveyor belt is adjusted by the controller 40 according to the production cycle.

[0022] The controller 40 includes a control host, which has a built-in processor module and a storage module for storing thickness grading standards. The processor module can be an ARM series microcontroller, a DSP digital signal processor, or an industrial-grade PLC programmable controller. The storage module can be a non-volatile storage medium such as EEPROM, Flash memory, or SD card.

[0023] The thickness measuring mechanism 20 is located at the thickness measuring station and includes at least one set of laser displacement sensors 21 positioned above and below the sheet material conveying path. In this embodiment, the thickness measuring mechanism 20 includes two sets of laser displacement sensors 21, one above the other, with the emitted beams of the two sets of laser displacement sensors 21 arranged coaxially.

[0024] The laser displacement sensor 21 operates on the principle of laser triangulation: a laser beam emitted from a semiconductor laser illuminates the surface of the substrate, and after reflection from the substrate surface, the reflected light is projected onto the terminal CCD or CMOS image sensor through a lens. When the thickness of the substrate changes, the position of the upper or lower surface of the substrate changes accordingly, causing the position of the light spot on the CCD to shift. The distance from the sensor to the substrate surface can be calculated using trigonometric functions.

[0025] During thickness measurement, the upper laser displacement sensor 21 measures the distance h1 from it to the upper surface of the plate, and the lower laser displacement sensor 21 measures the distance h2 from it to the lower surface of the plate. Given that the fixed distance between the two sets of laser displacement sensors 21 is H, the actual thickness T of the plate is T = H - h1 - h2.

[0026] The laser displacement sensor 21 converts the detected distance signal into an analog voltage signal or a digital signal, which is then transmitted to the controller 40 via a signal line.

[0027] The sorting mechanism 30 is located at the sorting station and includes several sorting conveyor belts distributed on both sides of the main conveyor belt. Each sorting conveyor belt corresponds to a different thickness grade output channel.

[0028] Side conveyor rollers 50 are installed inside the main conveyor belt. These side conveyor rollers 50 can rotate around a vertical axis. When the sheet material reaches a specific position, the side conveyor rollers 50 activate and push the sheet material to the side away from the main conveyor belt, allowing it to enter the corresponding sorting conveyor belt. The activation timing and rotation direction of the side conveyor rollers 50 are controlled by the controller 40 based on the sheet material thickness grade determination result.

[0029] The sorting conveyor belts are equipped with active roller sets along the conveying direction. These active roller sets are driven by motors and are used to push the plates received on the sorting conveyor belts to the corresponding output channels along the conveying direction. Each sorting conveyor belt can operate independently without interfering with the others.

[0030] In this embodiment, the sorting mechanism 30 includes four sorting conveyor belts, corresponding to four thickness grades: "ultra-thin plate," "thin plate," "standard plate," and "thick plate." In practical applications, the number of sorting conveyor belts and the corresponding thickness grades can be flexibly configured according to production needs.

[0031] The fully automatic plate thickness measurement and sorting system provided by the present invention is integrated into the controller 40, including a data acquisition module, a data processing module and an execution control module.

[0032] The data acquisition module is connected to the thickness measuring mechanism 20 via an analog input interface or a digital communication interface. The data acquisition module receives the thickness detection signal output from the laser displacement sensor 21, performs filtering, amplification, and other conditioning processing on the signal, and then converts the analog signal into a digital signal via an analog-to-digital converter (ADC) to generate a digital signal of the plate thickness. For the laser displacement sensor 21, which itself outputs a digital signal, the data acquisition module directly reads the thickness data via a digital communication interface (such as RS-485, CAN bus, etc.).

[0033] The data processing module is communicatively connected to the data acquisition module and includes a thickness calculation unit, a standard storage unit, and a grade determination unit. The thickness calculation unit calculates the actual thickness value of the current board material based on the digital signal of the board thickness. The standard storage unit stores preset thickness grading standards, which include multiple thickness grade ranges and their corresponding sorting channel information. The grade determination unit compares the actual thickness value with the thickness grading standards to determine the thickness grade to which the current board material belongs and generates a sorting determination result.

[0034] In this embodiment, the thickness grading criteria are as follows: Ultra-thin sheet: thickness < 3.0mm, corresponding to sorting conveyor belt No. 1; Thin plates: 3.0mm ≤ thickness < 5.0mm, corresponding to sorting conveyor belt No. 2; Standard plate: 5.0mm ≤ thickness ≤ 8.0mm, corresponding to sorting conveyor belt No. 3; Thick plates: Thickness > 8.0mm, corresponding to No. 4 sorting conveyor belt.

[0035] The above grading standards are for illustrative purposes only. In practical applications, they can be flexibly set and modified through the human-computer interaction module.

[0036] The execution control module communicates with the data processing module via a digital output interface or fieldbus (such as PROFIBUS, Modbus, etc.) and connects to the sorting mechanism 30. The execution control module receives the sorting judgment results, generates corresponding sorting execution commands based on the thickness grade information in the judgment results, and outputs them to the sorting mechanism 30. The sorting execution commands include the start timing and rotation direction of the lateral conveyor roller 50, and the start signal of the corresponding sorting conveyor belt.

[0037] As a further improvement to the present invention, the data processing module also includes a multi-point sampling unit and a mean calculation unit.

[0038] The multi-point sampling unit collects thickness data at multiple measurement locations on a single sheet of material during the process of passing through the thickness measurement station (such as the four corners and center of the sheet, or multiple cross-sectional locations along the conveying direction of the sheet) to generate a multi-point thickness dataset.

[0039] The mean calculation unit performs statistical calculations on the multi-point thickness dataset to generate the average thickness value and thickness uniformity index of the current plate. The thickness uniformity index can be characterized by statistical parameters such as standard deviation and range.

[0040] The grading unit determines the thickness grade based on a comprehensive assessment of the average thickness and thickness uniformity index. For example, if the average thickness of the board falls within a certain grade range but the thickness uniformity index exceeds a preset range, the grading unit can downgrade the board or classify it as a non-conforming product. This comprehensive grading method effectively avoids random errors caused by single-point measurements, improving the accuracy and reliability of sorting.

[0041] As a further improvement to the present invention, the fully automatic plate thickness measurement and sorting system also includes a feedback correction module.

[0042] The feedback correction module is connected to the data processing module and the execution control module respectively. After the sorting mechanism 30 performs the sorting action, the feedback correction module obtains the actual sorting result through the sensor (such as photoelectric sensor, proximity switch, etc.) set at the output end of the sorting conveyor belt, and compares the actual sorting result with the sorting judgment result.

[0043] When both are consistent, it indicates that the sorting execution is correct and the system is operating normally. When they are inconsistent, the feedback correction module generates a correction signal and feeds it back to the execution control module. The execution control module then corrects the subsequent sorting execution instructions based on the correction signal. For example, if a certain thickness grade of board material is repeatedly incorrectly sorted into the output channel of an adjacent grade, the feedback correction module can determine that there is a systematic deviation in the sorting execution. It can then adjust the starting timing of the lateral conveyor roller 50 or the starting delay of the sorting conveyor belt through the correction signal to eliminate the deviation.

[0044] The feedback correction module forms a closed-loop control system, which can effectively improve the long-term stability and accuracy of sorting.

[0045] As a further improvement to the present invention, the fully automatic plate thickness measurement and sorting system also includes a human-machine interaction module and an abnormal alarm module.

[0046] The human-machine interface (HMI) module connects to the data processing module and includes a touchscreen display and button input devices. The HMI module provides an interface for setting and modifying thickness grading standards, allowing operators to flexibly adjust the boundary values ​​and corresponding sorting channels for each thickness grade range according to actual production needs. Simultaneously, the HMI module can display the current sheet thickness detection data and sorting results in real time, and output statistical reports of historical detection data in chart form, facilitating quality traceability and production management for operators.

[0047] The anomaly alarm module is connected to the data processing module. When the data processing module determines that the thickness of the current board exceeds the preset thickness threshold range (e.g., severely out of tolerance), the anomaly alarm module generates an alarm signal and triggers an alarm notification. Alarm methods include audible and visual alarms (buzzer, alarm light), on-screen pop-up notifications, and remote SMS / email notifications. The anomaly alarm module can promptly remind operators to handle abnormal situations, preventing defective products from flowing into subsequent processes and ensuring production quality and safety.

[0048] The working process of the fully automatic sheet metal thickness measuring and sorting device and system of the present invention is as follows: Step S1: Loading and conveying. The sheet material to be tested is carried by the main conveyor belt of the conveying mechanism 10 and conveyed sequentially to the thickness measurement station and the sorting station along the conveying direction.

[0049] Step S2: Thickness Detection. When the sheet material reaches the thickness measurement station, the laser displacement sensor 21 of the thickness measurement mechanism 20 performs non-contact thickness detection on the sheet material. The upper laser displacement sensor 21 measures its distance to the upper surface of the sheet material, and the lower laser displacement sensor 21 measures its distance to the lower surface of the sheet material. Both sets of measurement data are transmitted to the controller 40.

[0050] Step S3: Signal Processing and Thickness Calculation. The data acquisition module in controller 40 receives the thickness detection signal, performs signal conditioning and analog-to-digital conversion, and generates a digital signal of the plate thickness. The thickness calculation unit of the data processing module calculates the actual thickness value of the current plate based on the digital signal.

[0051] Step S4: Multi-point sampling and grade determination. The multi-point sampling unit collects thickness data at multiple measurement locations on a single board. The mean calculation unit generates an average thickness value and a thickness uniformity index. The grade determination unit compares the average thickness value with the thickness grading standards stored in the storage module, and combines this with the thickness uniformity index to make a comprehensive judgment, generating a sorting and determination result that includes the board thickness grade information.

[0052] Step S5: Sorting Execution. The execution control module receives the sorting judgment result, generates the corresponding sorting execution command based on the thickness grade information, and outputs it to the sorting mechanism 30. When the sheet material reaches a specific position in the sorting station, the lateral conveying roller 50 starts, conveying the sheet material laterally onto the sorting conveyor belt corresponding to the current sheet material thickness grade. The sorting conveyor belt pushes the sheet material along the conveying direction to the corresponding output channel through the active roller group.

[0053] Step S6: Feedback Correction. The feedback correction module obtains the actual sorting result after the sorting mechanism 30 performs the sorting action, and compares the actual sorting result with the sorting judgment result. When the two are inconsistent, a correction signal is generated and fed back to the execution control module. The execution control module corrects the subsequent sorting execution instructions of the plates according to the correction signal.

[0054] Step S7: Human-Machine Interaction and Anomaly Alarm. Throughout the entire process, the human-machine interaction module displays the current board thickness detection data and sorting results in real time. When the board thickness is detected to exceed the preset thickness threshold range, the anomaly alarm module triggers an alarm notification.

[0055] The above steps S1 to S7 are executed cyclically, realizing fully automated continuous operation of the entire process of sheet material from conveying, thickness measurement to grading and sorting.

Claims

1. A fully automatic sheet metal thickness measuring and sorting device, characterized in that, include: A conveying mechanism (10), a thickness measuring mechanism (20), and a sorting mechanism (30) are arranged sequentially along the conveying direction of the sheet metal, and a controller (40) is electrically connected to the conveying mechanism (10), the thickness measuring mechanism (20), and the sorting mechanism (30) respectively. The conveying mechanism (10) includes a main conveyor belt, which is used to convey the plate to be tested sequentially to the thickness measurement station and the sorting station; The controller (40) includes a control host, which has a built-in processor module and a storage module for storing thickness grading standards; The thickness measuring mechanism (20) is located at the thickness measuring station and is used to detect the thickness of the plate passing through and generate a thickness detection signal. The sorting mechanism (30) is located at the sorting station and includes several sorting conveyor belts distributed on both sides of the main conveyor belt, each sorting conveyor belt corresponding to a different thickness grade output channel. The main conveyor belt is equipped with a side conveying roller (50), which is used to convey the plate to the side onto the corresponding sorting conveyor belt when the plate moves to a specific position; The controller (40) receives the thickness detection signal generated by the thickness measuring mechanism (20), calls the thickness grading standard stored in the storage module, generates a sorting control instruction through the processor module, and outputs it to the sorting mechanism (30) to control the sorting conveyor belt corresponding to the current plate thickness grade to receive the plate conveyed by the lateral conveying roller (50) and push the plate to the corresponding output channel along the conveying direction.

2. The fully automatic sheet metal thickness measuring and sorting device according to claim 1, characterized in that, The thickness measuring mechanism (20) includes at least one set of laser displacement sensors (21) disposed above and below the plate conveying path. The laser displacement sensors (21) are used to non-contactly measure the distance between the upper and lower surfaces of the plate to obtain the plate thickness value.

3. The fully automatic sheet metal thickness measuring and sorting device according to claim 1, characterized in that, The sorting conveyor belt is equipped with an active roller group along the conveying direction. The active roller group is used to push the plates received on the sorting conveyor belt to the corresponding output channel along the conveying direction.

4. A fully automatic sheet metal thickness measurement and sorting system, applied to the fully automatic sheet metal thickness measurement and sorting device according to any one of claims 1 to 3, characterized in that, The sorting system is integrated into the controller (40), and the sorting system includes: The data acquisition module is used to receive the plate thickness detection signal collected by the thickness measuring mechanism (20), and to perform signal conditioning and analog-to-digital conversion processing on the thickness detection signal to generate a digital signal of plate thickness; The data processing module is communicatively connected to the data acquisition module and is used to receive the digital signal of the plate thickness, determine the thickness grade of the current plate according to the preset thickness grading standard, and generate a sorting and determination result containing the plate thickness grade information. The execution control module is connected in communication with the data processing module. It is used to receive the sorting judgment result, generate the corresponding sorting execution instruction according to the thickness grade information in the sorting judgment result, and output the sorting execution instruction to the sorting mechanism (30) to control the sorting conveyor belt corresponding to the current plate thickness grade to receive the plate conveyed by the side conveying roller (50) and convey the plate to the output channel corresponding to the thickness grade.

5. The fully automatic sheet metal thickness measurement and sorting system according to claim 4, characterized in that, The data processing module includes: A thickness calculation unit is used to calculate the actual thickness value of the current plate based on the digital signal of the plate thickness. A standard storage unit is used to store a preset thickness grading standard, which includes multiple thickness grade ranges and their corresponding sorting channel information; The grade determination unit is connected to the thickness calculation unit and the standard storage unit respectively, and is used to compare the actual thickness value with the thickness grading standard, determine the thickness grade to which the current board belongs, and generate the sorting determination result.

6. The fully automatic sheet metal thickness measurement and sorting system according to claim 4, characterized in that, The data processing module further includes: A multi-point sampling unit is used to collect thickness data at multiple measurement locations on a single sheet material, generating a multi-point thickness dataset; The mean calculation unit, connected to the multi-point sampling unit, is used to perform statistical calculations on the multi-point thickness dataset to generate the average thickness value and thickness uniformity index of the current plate. The grade determination unit makes a comprehensive thickness grade determination based on the average thickness value and the thickness uniformity index.

7. The fully automatic sheet metal thickness measurement and sorting system according to claim 4, characterized in that, Also includes: The feedback correction module is connected to the data processing module and the execution control module respectively. It is used to obtain the actual sorting result after the sorting mechanism (30) performs the sorting action, compare the actual sorting result with the sorting judgment result, and generate a correction signal when the two are inconsistent and feed it back to the execution control module. The execution control module corrects the subsequent plate sorting execution instructions according to the correction signal.

8. The fully automatic sheet metal thickness measurement and sorting system according to claim 4, characterized in that, Also includes: The human-computer interaction module, connected to the data processing module, is used to provide an interface for setting and modifying thickness grading standards, display the current thickness detection data and sorting results of the board in real time, and output statistical reports of historical detection data.

9. The fully automatic sheet metal thickness measurement and sorting system according to claim 4, characterized in that, Also includes: An abnormal alarm module, connected to the data processing module, is used to generate an alarm signal and trigger an alarm prompt when the data processing module determines that the thickness of the current board exceeds a preset thickness threshold range.

10. The fully automatic sheet metal thickness measurement and sorting system according to claim 4, characterized in that, The data acquisition module, the data processing module and the execution control module are integrated in the controller (40). The data acquisition module is connected to the thickness measuring mechanism (20) through an analog input interface or a digital communication interface. The execution control module is connected to the sorting mechanism (30) through a digital output interface or a fieldbus.

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