A marking defect analysis system and method based on laser light intensity detection

Abstract

The application belongs to the technical field of marking detection, and specifically provides a marking defect analysis system and method based on laser intensity detection. The system comprises a controller, a marking execution unit and a marking detection unit connected with the controller. The controller controls the marking execution unit to perform a marking action through an output logic control signal, and sends the output logic control signal to the marking detection unit. The marking execution unit is controlled to work or the result is directly output according to the result returned by the marking detection unit. The marking execution unit receives the marking logic control signal output by the controller to perform a marking action. The marking detection unit collects laser information emitted during the working process of the marking execution unit. The acquired logic control signal and the stored normal light intensity parameter are compared with the received laser information respectively, and the result is fed back to the controller. The system can detect the completeness of the marked characters and the good or bad of the marking effect. The implementation cost is low, the debugging and maintenance are simple, and time and labor are saved.

Description

Technical Field

[0001] This invention relates to the field of marking management technology, specifically to a marking defect analysis system and method based on laser light intensity detection. Background Technology

[0002] According to national regulations or corporate management needs, unique identifiers such as text and graphics are applied to products, including vehicle identification codes, engine codes, and serial numbers. This process is called marking. These identifiers are typically unique and serve as the product's identity ID throughout its entire lifecycle, requiring high accuracy and readability.

[0003] There are many types of marking defects, such as missing strokes or inconsistent depth. There are various inspection methods, such as the well-known machine vision-based inspection, which checks the marking results through image computation and analysis; and audio analysis-based inspection, which checks the marking results by analyzing the inherent sound frequencies generated by the equipment during the marking process.

[0004] Using existing technologies such as machine vision involves high costs for hardware and software, debugging, and subsequent maintenance, and has a long implementation cycle. It typically requires specialized technicians to complete. Furthermore, vision is greatly affected by factors such as light source, installation space, and environment (e.g., vibration, oil stains), making it unusable in some scenarios. It also requires high installation precision; any changes to the installation necessitate re-adjustment, which is time-consuming, labor-intensive, and expensive. Audio inspection, on the other hand, has limitations; its recognition accuracy is somewhat inaccurate in noisy environments. Summary of the Invention

[0005] To address the problems existing in current marking defect detection methods, this invention provides a marking defect analysis system and method based on laser light intensity detection.

[0006] In a first aspect, the present invention provides a marking defect analysis system based on laser light intensity detection, including a controller and a marking execution unit and a marking detection unit connected to the controller; The controller is used to control the marking execution unit to perform marking actions by outputting logic control signals; and to send the output logic control signals to the marking detection unit; it is also used to control the marking execution unit to work or directly output the results based on the results returned by the marking detection unit. The marking execution unit is used to receive the marking logic control signal output by the controller and execute the marking action; The marking detection unit is used to collect the laser information emitted by the marking execution unit during operation; it compares the acquired logic control signal and the stored normal light intensity parameters with the received laser information and feeds the results back to the controller.

[0007] As a preferred embodiment of the present invention, the system further includes a display connected to the controller, the display being used to display the marking system software and perform human-computer interaction.

[0008] As a preferred embodiment of the technical solution of the present invention, the marking detection unit includes a detection body and a communication cable; The detection unit is connected to the controller via a communication cable; The detection unit includes a detection sensor and a processor connected to the detection sensor; The detection sensor is used to collect the laser information emitted by the marking execution unit during operation and transmit it to the processor; the laser information includes information that characterizes whether the laser emits light and the light intensity. The processor compares the acquired control pulse signal from inside the controller with the laser information transmitted from the detection sensor indicating whether the laser is emitting light; at the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory; and transmits the results to the controller via a communication cable.

[0009] As a preferred embodiment of the technical solution of the present invention, the marking execution unit includes a laser and a galvanometer connected to the controller; The controller is used to control the trajectory movement of the galvanometer and the laser output during the entire marking process.

[0010] As a preferred embodiment of the technical solution of the present invention, the controller controls the laser to emit light by outputting control pulse signals, and transmits the control pulse signals to the processor synchronously through a communication cable; The processor stores the control pulse signals into the corresponding array.

[0011] As a preferred embodiment of the technical solution of the present invention, the detection sensor detects the laser information emitted by the laser to the outside and transmits it to the processor for processing; When the processor receives the laser information transmitted by the detection sensor, it compares the laser information with the corresponding control pulse signal in the array to determine whether each control pulse has a corresponding actual light output, thereby judging whether there are any missing marks in the marking. At the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to judge whether there are any inconsistencies in the marking depth, and transmits the judgment result to the controller through the communication cable.

[0012] As a preferred embodiment of the technical solution of the present invention, the processor is also connected to a memory; The processor is also used to store the light intensity information and the judgment result as comparison parameters for this type of workpiece in the memory; in the next marking process, it processes the laser information collected in the current marking process, and at the same time calls the comparison parameter information stored in the previous marking process for comparison and analysis.

[0013] As a preferred embodiment of the technical solution of the present invention, the processor is also used to output an NG signal to the controller when a missing stroke is detected; and to output an NG signal to the controller when the error between the light intensity information of the laser detected by the detection sensor and the normal light intensity parameter stored in the memory is greater than a set threshold. Secondly, the present invention provides a marking defect analysis method based on laser light intensity detection, comprising the following steps: The controller enables the laser and galvanometer to work and controls the trajectory movement of the galvanometer and the laser output during the entire marking process; at the same time, it transmits the control pulse signal for controlling the laser to the processor. The detection sensor collects the laser information emitted by the laser during its operation and transmits it to the processor; the laser information includes information that characterizes whether the laser is emitting light and the light intensity. The processor compares the control pulse signal obtained from the controller with the presence or absence information transmitted by the detection sensor to determine whether there are any missing strokes in the marking; at the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to determine whether there are any inconsistencies in the depth of the marking.

[0014] As a preferred embodiment of the technical solution of the present invention, the processor compares the control pulse signal obtained from the controller with the presence or absence information transmitted by the detection sensor to determine whether there are missing strokes in the marking; simultaneously, the processor compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to determine whether there are inconsistencies in the depth of the marking. The processor stores the control pulse signals in the corresponding array. When it receives the laser information transmitted by the detection sensor, it compares the laser information with the corresponding control pulse signals in the array to determine whether each control pulse has a corresponding actual light output. This is used to determine whether there are missing strokes in the marking. If there are missing strokes, an NG signal is output. At the same time, the light intensity information fed back by the detection sensor is compared with the normal light intensity parameters stored in the memory. If the error is greater than the set threshold, an NG signal is output to determine whether there is uneven marking depth. The judgment result is transmitted to the controller through the communication cable.

[0015] As can be seen from the above technical solutions, this invention has the following advantages: By detecting the presence and power intensity (light intensity information) of laser emission within a single switching optical cycle of the laser marking equipment, it effectively detects defective marking characters, prevents defective products from leaving the equipment, and improves the process control capability of the marking equipment. This system, through the detection, storage, comparison, and analysis of the presence and power intensity of laser emission within a single switching optical cycle during the operation of the marking equipment, can effectively detect the integrity of the marking characters and the quality of the marking effect. It has low implementation costs, simple debugging and maintenance, saves time and effort, does not require professional technicians, and its modular packaging design better adapts to the complex and ever-changing industrial environment, making it more closely aligned with industry application characteristics.

[0016] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects.

[0017] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the hardware composition of the system according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the detection process of the present invention.

[0021] Figure 3 This is a schematic flowchart of a method according to an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0023] like Figure 1 As shown, this embodiment of the invention provides a marking defect analysis system based on laser light intensity detection, including a controller 2 and a marking execution unit and a marking detection unit connected to the controller 2; Controller 2 is used to control the marking execution unit to perform marking actions by outputting logic control signals; and to send the output logic control signals to the marking detection unit; it is also used to control the marking execution unit to work or directly output the results based on the results returned by the marking detection unit. The marking execution unit is used to receive the marking logic control signal output by the controller and execute the marking action; The marking detection unit is used to collect the laser information emitted by the marking execution unit during operation; it compares the acquired logic control signal and the stored normal light intensity parameters with the received laser information and feeds the results back to the controller.

[0024] In some embodiments, the system further includes a display 1 connected to the controller, the display 1 being used to display the marking system software and perform human-computer interaction.

[0025] In some embodiments, the marking detection unit includes a detection body 50 and a communication cable; The detection unit 50 is connected to the controller 2 via a communication cable; The detection unit includes a detection sensor and a processor connected to the detection sensor; The detection sensor is used to collect the laser information emitted by the marking execution unit during operation and transmit it to the processor; the laser information includes information that characterizes whether the laser emits light and the light intensity. The processor compares the acquired control pulse signal from inside the controller with the laser information transmitted from the detection sensor indicating whether the laser is emitting light; at the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory; and transmits the results to the controller via a communication cable.

[0026] The marking execution unit includes a laser 3 and a galvanometer 4 connected to the controller 2; The controller is used to control the trajectory movement of the galvanometer and the laser output during the entire marking process.

[0027] In some embodiments, the detection body also includes a metal casing, in which the detection sensor and processor are enclosed.

[0028] In some embodiments, the controller controls the laser to emit light by outputting control pulse signals, and transmits the control pulse signals synchronously to the processor via a communication cable. The processor stores the control pulse signals into the corresponding array.

[0029] The detection sensor detects the laser information emitted by the laser and transmits it to the processor for processing. When the processor receives the laser information transmitted by the detection sensor, it compares the laser information with the corresponding control pulse signal in the array to determine whether each control pulse has a corresponding actual light output, thereby judging whether there are any missing marks in the marking. At the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to judge whether there are any inconsistencies in the marking depth, and transmits the judgment result to the controller through the communication cable.

[0030] The processor is also connected to memory; The processor is also used to store the light intensity information and the judgment result as comparison parameters for this type of workpiece in the memory; in the next marking process, it processes the laser information collected in the current marking process, and at the same time calls the comparison parameter information stored in the previous marking process for comparison and analysis.

[0031] The system controls the movement and marking of three lasers and four galvanometers; the three lasers and four galvanometers are the execution units; the marking detection unit is the final detection unit, which provides feedback to the system on whether any abnormalities occurred during the marking process.

[0032] The marking detection unit 50 includes a detection body and communication cable. The detection body is encased in a metal shell, containing detection sensors and a processor. The detection sensors collect information during the marking process and transmit it to the processor. The processor, acting as a lower-level system, stores data and performs logical processing, transmitting the final results to the controller in real time via the communication cable. The controller contains the marking system software, serving as the upper-level system.

[0033] like Figure 2 As shown, the main process includes: system startup, optical information acquisition, lower-level system processing, communication transmission, upper-level system processing, and result output.

[0034] System startup: After the marking equipment is powered on, it enables the laser and galvanometer through communication between the marking software and the controller, and starts the marking process.

[0035] Optical information acquisition: During the marking process, the detection sensor in the detection body will collect the laser information emitted by the laser during operation at a specific distance and within a specific range.

[0036] Lower-level system processing: The laser information collected by the detection sensors in the main detection unit is transmitted to the lower-level system for data processing, storage, and logical processing. During the initial normal operation of the device, the lower-level system first collects the logic control signals inside the controller via the communication cable, and simultaneously receives the laser information transmitted by the detection sensors. Through a series of calculations and comparisons, it calculates the result information, transmits it to the upper-level system via the communication cable, and simultaneously stores the information in its memory. After the initial operation of the device ends, upon resuming operation, the lower-level system reads the parameter information from the memory during the initial operation and adds it to the data comparison, increasing the accuracy of the results.

[0037] The specific processing procedure is as follows: The controller controls the trajectory movement of the galvanometer and the laser emission during the entire marking process. The control signal for laser emission is a set of pulse signals, which are synchronously transmitted to the lower-level system via a communication cable. The lower-level system stores the control pulse signals in a corresponding array. Simultaneously, the detection sensor transmits the laser information emitted by the laser to the lower-level system for preliminary processing. Then, the lower-level system compares the laser information (determining whether the laser actually emitted light) with the corresponding control pulse signals in the array and transmits the result to the upper-level system via the communication cable for further processing. Furthermore, the laser information and the judgment result are stored in the lower-level system as comparison parameters for this type of workpiece. In the next marking process, in addition to processing the light intensity information collected during the current marking process, the system will also call upon the parameter information stored in the previous marking process for further, more accurate comparisons for different marked workpieces. If the light intensity information detected by the detection sensor differs from the expected data, the lower-level system will output an NG signal to the upper-level system.

[0038] Communication transmission: The lower-level system inside the detection body will collect the calculation results in real time through the communication cable to acquire the logic control signals in the controller, and transmit the results to the software in the controller for further processing.

[0039] Upper-level system processing: After receiving data information through the communication cable, the upper-level system will integrate and process the information and feed the results back to the display interface in real time.

[0040] Output Results: In case of defects, users can choose to output the signal in real time or after accumulation to the user PLC, external audio-visual feedback, equipment emergency stop, etc., depending on their needs. It has output capabilities in multiple ways, including DIO, serial port, TCP / IP, Profinet, and OPC, and can seamlessly connect to various PCs, PLCs, and other terminals.

[0041] like Figure 3As shown in the figure, this embodiment of the invention also provides a marking defect analysis method based on laser light intensity detection, including the following steps: Step 1: The controller enables the laser and galvanometer to work and controls the trajectory movement of the galvanometer and the light output of the laser throughout the marking process; at the same time, it transmits the control pulse signal for controlling the laser to the processor. Step 2: The detection sensor collects the laser information emitted by the laser during operation and transmits it to the processor; the laser information includes whether the laser emits light and the light intensity information. Step 3: The processor compares the control pulse signal obtained from the controller with the laser information transmitted from the detection sensor indicating whether the laser emits light, to determine if there are any missing marks in the marking; at the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to determine if there are any inconsistencies in the depth of the marking.

[0042] The processor compares the control pulse signal acquired from the controller with the presence / absence information received from the detection sensor to determine if there are any missing strokes in the marking; simultaneously, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to determine if there are any inconsistencies in the marking depth. The processor stores the control pulse signals in the corresponding array. When it receives the laser information transmitted by the detection sensor, it compares the laser information with the corresponding control pulse signals in the array to determine whether each control pulse has a corresponding actual light output. This is used to determine whether there are missing strokes in the marking. If there are missing strokes, an NG signal is output. At the same time, the light intensity information fed back by the detection sensor is compared with the normal light intensity parameters stored in the memory. If the error is greater than the set threshold, an NG signal is output to determine whether there is uneven marking depth. The judgment result is transmitted to the controller through the communication cable.

[0043] In some embodiments, the method provided is based on the system provided in the above embodiments.

[0044] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0045] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A marking defect analysis system based on laser light intensity detection, characterized in that, Includes a controller and a marking execution unit and a marking detection unit connected to the controller; The controller is used to control the marking execution unit to perform marking actions by outputting logic control signals; and to send the output logic control signals to the marking detection unit; it is also used to control the marking execution unit to work or directly output the results based on the results returned by the marking detection unit. The marking execution unit is used to receive the marking logic control signal output by the controller and execute the marking action; The marking detection unit is used to collect the laser information emitted by the marking execution unit during operation; it compares the acquired logic control signal and the stored normal light intensity parameters with the received laser information and feeds the results back to the controller. The marking execution unit includes a laser and a galvanometer connected to the controller; The controller is used to control the trajectory movement of the galvanometer and the laser output during the entire marking process; The controller controls the laser to emit light by outputting control pulse signals, and synchronously transmits the control pulse signals to the processor via a communication cable. The processor stores the control pulse signals into the corresponding array; The detection sensor detects the laser information emitted by the laser and transmits it to the processor for processing. When the processor receives the laser information transmitted by the detection sensor, it compares the laser information with the corresponding control pulse signal in the array to determine whether each control pulse has a corresponding actual light output, thereby judging whether there are any missing marks in the marking; at the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to judge whether there are any inconsistencies in the marking depth, and transmits the judgment result to the controller through the communication cable. The processor is also connected to memory; The processor is also used to store the light intensity information and the judgment result as comparison parameters of the workpiece in the memory; in the next marking process, it processes the laser information collected in the current marking process, and at the same time calls the comparison parameter information stored in the previous marking process for comparison and analysis. The control signal for controlling the laser's light output is a set of pulse signals. These pulse signals are synchronously transmitted to the processor via a communication cable, and the processor stores the control pulse signals in a corresponding array. The detection sensor transmits the laser information emitted by the laser to the processor, which then processes it. The processor compares the laser information used to determine whether the laser has actually emitted light to the outside with the corresponding control pulse signal in the array, and transmits the comparison result to the controller for further processing via a communication cable. The laser information and the judgment result are stored in the memory as comparison parameters for the workpiece. In the next marking process, in addition to processing the light intensity information collected during the current marking process, the processor also calls up the parameter information stored during the previous marking process to compare different marked workpieces. When the light intensity information detected by the detection sensor differs from the actual data that should be achieved, the processor outputs an NG signal to the controller.

2. The marking defect analysis system based on laser light intensity detection according to claim 1, characterized in that, The system also includes a display connected to the controller, which is used to display the marking system software and facilitate human-computer interaction.

3. The marking defect analysis system based on laser light intensity detection according to claim 1 or 2, characterized in that, The marking and testing unit includes the testing body and communication cables; The detection unit is connected to the controller via a communication cable; The detection unit includes a detection sensor and a processor connected to the detection sensor; The detection sensor is used to collect the laser information emitted by the marking execution unit during operation and transmit it to the processor; the laser information includes information that characterizes whether the laser emits light and the light intensity. The processor is used to compare the control pulse signal acquired from the controller with the laser information transmitted from the detection sensor indicating whether the laser emits light; at the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory. The results are then transmitted to the controller via a communication cable.

4. The marking defect analysis system based on laser light intensity detection according to claim 1, characterized in that, The processor is also used to output an NG signal to the controller when a missing pen is detected; and to output an NG signal to the controller when the error between the light intensity information of the laser detected by the detection sensor and the normal light intensity parameter stored in the memory is greater than a set threshold.

5. A marking defect analysis method based on laser light intensity detection, applicable to the marking defect analysis system based on laser light intensity detection as described in any one of claims 1-4, characterized in that, Includes the following steps: The controller enables the laser and galvanometer to work and controls the trajectory movement of the galvanometer and the laser output during the entire marking process; at the same time, it transmits the control pulse signal for controlling the laser to the processor. The detection sensor collects the laser information emitted by the laser during its operation and transmits it to the processor; the laser information includes information that characterizes whether the laser is emitting light and the light intensity. The processor compares the control pulse signal obtained from the controller with the laser information transmitted from the detection sensor indicating whether the laser emits light, to determine if there are any missing strokes in the marking. At the same time, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to determine if there are any inconsistencies in the depth of the marking.

6. The marking defect analysis method based on laser light intensity detection according to claim 5, characterized in that, The processor compares the control pulse signal acquired from the controller with the presence / absence information received from the detection sensor to determine if there are any missing strokes in the marking; simultaneously, it compares the light intensity information fed back by the detection sensor with the normal light intensity parameters stored in the memory to determine if there are any inconsistencies in the marking depth. The processor stores the control pulse signals in the corresponding array. When it receives the laser information transmitted by the detection sensor, it compares the laser information with the corresponding control pulse signals in the array to determine whether each control pulse has a corresponding actual light output. This is used to determine whether there are missing strokes in the marking. If there are missing strokes, an NG signal is output. At the same time, the light intensity information fed back by the detection sensor is compared with the normal light intensity parameters stored in the memory. If the error is greater than the set threshold, an NG signal is output to determine whether there is uneven marking depth. The judgment result is transmitted to the controller through the communication cable.

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