Transverse cutting steel plate laser marking system

Abstract

The invention relates to the technical field of laser marking in laser processing, in particular to a transverse cutting steel plate laser marking system, and aims at solving the problem that in the prior art, the marking quality is degraded due to the fact that plate jumping cannot be restrained in the continuous conveying process. The state sensing module collects transmission roller rotation parameters and steel plate double-sided images; the state analysis module judges plate deformation based on jump position contour curvature abrupt change characteristics or judges transmission roller synchronization abnormity based on inter-roller phase difference time sequence overrun; the marking positioning module avoids outside a first distance when responding to different causes of dynamic offset marking area deformation, and contracts to the front section of a steel plate within a second distance when a roller system is abnormal; and the laser marking module finally focuses on the selected area to perform marking. Jumping source isolation and precise positioning are realized through control logic innovation, and the industrial problem that efficiency and precision cannot be achieved at the same time is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser marking in laser processing, in particular to a cross-cutting steel plate laser marking system. Background Art

[0002] In the prior art, cross-cut sheets, such as steel plates, are often conveyed horizontally across multiple drive rollers. The rotation of these rollers drives the sheet. However, due to manufacturing and installation errors, bearing clearances, wear and foreign matter on the roller surfaces, and slight deformation or unevenness of the sheet itself, the sheet inevitably experiences runout or vibration in the vertical direction (Z-axis) and / or in the horizontal plane (X / Y-axis runout) during conveyance.

[0003] For example, in the prior art, Chinese patent publication number CN118808924BA discloses an automatic measuring and marking device in a feeding system, including a feeding area, a measuring component is provided on the feeding area, and a plurality of marking streamline components are arranged on the side of the feeding area, and a plurality of laser marking machines are distributed in each of the marking streamline components, and a confirmation scanning device is provided at the rear end of each of the marking streamline components; a horizontal guide rail is provided above the feeding area to cross each marking streamline component, and a manipulator is slidably provided in the horizontal guide rail; a positioning scanning device is provided between the measuring component and the manipulator; it has shown significant progress in improving production efficiency, enhancing measurement accuracy, flexibly adapting to plates of different specifications, optimizing marking efficiency and quality, improving production safety and operation convenience, and reducing production costs and resource consumption.

[0004] However, traditional laser marking control logic typically assumes the workpiece is stationary or performs simple speed synchronization in a state of uniform linear motion. When the plate exhibits significant jitter, this simple synchronization can lead to the following problems: the laser focus position changes with the plate jitter, resulting in blurred marking, inconsistent depth, or even ineffective marking. Jitter can also cause the plate to slightly deflect or shift horizontally, causing the marking pattern to shift and deform relative to its intended position. This ultimately results in uneven marking and poor precision, failing to meet high-quality requirements. This demonstrates that existing technologies cannot effectively avoid degradation of marking quality due to minor plate movement while maintaining marking efficiency. Summary of the Invention

[0005] To this end, the present invention provides a cross-cutting steel plate laser marking system to solve the problem that the existing technology cannot effectively avoid the phenomenon of marking quality degradation caused by micro-displacement of the plate while ensuring marking efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides a laser marking system for cross-cut steel plates, comprising a zoning module, a state sensing module, a state analysis module, a marking positioning module and a laser marking module. The zoning module divides a plurality of transmission rollers for transmitting the cross-cut steel plates into a run-out analysis zone and a laser marking zone in sequence from front to back along the process; the state sensing module is used to collect the rotation parameters of each transmission roller, as well as the upper surface image and the lower surface image of the cross-cut steel plate; the state analysis module is configured to obtain, before the cross-cut steel plate is transmitted to the marking verification zone, the following information during the transmission process of the cross-cut steel plate in the run-out analysis zone: the run-out position with the largest elevation fluctuation, the run-out phenomenon of the run-out position with the largest elevation fluctuation, and the run-out parameters of each transmission roller at the stage when the run-out phenomenon occurs. The state analysis module determines that the beating is caused by the unevenness of the lower surface of the horizontal plate and / or the abnormal synchronization of the transmission roller based on the acquired parameters; the marking positioning module is configured to execute the following process after the state analysis module completes the determination: in response to the state analysis module determining that the beating is caused by the unevenness of the lower surface of the horizontal plate, a marking area is selected based on the upper surface image of the horizontal plate outside the first distance from the beating position; in response to the state analysis module determining that the beating is caused by the abnormal synchronization of the transmission roller, a marking area is selected within a second distance from the front section of the horizontal plate along the process; the laser marking module is used to focus on the marking area and mark.

[0007] As the preferred technical solution for the cross-cutting steel plate laser marking system, the state analysis module analyzes the surface image below the beating position:

[0008] Extract the surface profile data of the area directly below the runout position and calculate the local curvature radius distribution of the area in the transmission direction;

[0009] In response to identifying that the curvature radius of at least one continuous contour point is smaller than a preset threshold and there is a sudden change in height in the area, it is determined that the jump is caused by the unevenness of the lower surface of the horizontal plate; conversely, the rotation parameters of each transmission roller are analyzed at the jumping position with the largest elevation fluctuation and the stage when the jumping phenomenon occurs at the jumping position with the largest elevation fluctuation.

[0010] As an optimal technical solution for the cross-cutting steel plate laser marking system, the state acquisition module obtains rotation parameters through the angle Hall sensors installed on each transmission roller. The rotation parameters include the angular velocity and rotation angle of the transmission roller.

[0011] As the preferred technical solution for the cross-cut steel plate laser marking system, the specific process of the state analysis module analyzing the rotation parameters of each transmission roller at the stage of the beating position with the largest elevation fluctuation and the beating phenomenon of the beating position with the largest elevation fluctuation includes:

[0012] Extracting the real-time rotation angle sequence of each transmission roller during the duration of the beating phenomenon;

[0013] Calculate the rotation angle difference between adjacent transmission rollers at the same time and generate the phase difference time series curve between rollers;

[0014] The inter-roller phase difference timing curve is compared with a preset tolerance threshold range. If the continuous exceeding limit sections in the curve cover more than a preset proportion of the duration of the beating phenomenon, it is determined that the beating is caused by abnormal transmission roller synchronization.

[0015] As a preferred technical solution of the cross-cutting steel plate laser marking system, the marking module is further configured to determine the first distance, specifically including:

[0016] Extract the surface profile data of the area directly below the beating position and obtain the minimum curvature radius and maximum height mutation value of the area;

[0017] Selecting the first distance within an optional range based on the minimum curvature radius value and the maximum height mutation value;

[0018] The first distance is negatively correlated with the minimum curvature radius value and positively correlated with the maximum height mutation value.

[0019] As a preferred technical solution of the cross-cutting steel plate laser marking system, the marking configuration module is further configured to determine the second distance, specifically including: extracting a timing curve of the phase difference between rollers corresponding to the jump caused by the transmission roller synchronization abnormality determined by the state analysis module;

[0020] Dynamically selecting a second distance from a preset distance mapping table based on a ratio of a continuous overrun section in the inter-roller phase difference timing curve covering a duration of a beating phenomenon;

[0021] The value of the second distance is negatively correlated with the ratio value.

[0022] As a preferred technical solution for the cross-cut steel plate laser marking system, the specific process of the marking positioning module selecting the marking area based on the upper surface image of the cross-cut steel plate includes:

[0023] In the candidate area determined outside the first distance and / or within the second distance, grayscale processing and edge detection are performed on the upper surface image to segment the effective area of the plate;

[0024] Perform gridding and block processing on the effective area and calculate the grayscale variance value of each grid cell;

[0025] The continuous grid cell cluster with the smallest grayscale variance value is selected as the marking area.

[0026] As a preferred technical solution for the cross-cut steel plate laser marking system, the device for collecting the upper surface image and the lower surface image of the cross-cut steel plate in the state perception module is a high-speed linear array CCD camera.

[0027] As an optimal technical solution for the cross-cutting steel plate laser marking system, the laser marking module includes a laser head and a focusing lens, and the focusing lens is equipped with a Z-axis automatic focusing actuator.

[0028] As an optimal technical solution for the cross-cutting steel plate laser marking system, the surface of the transmission roller is covered with a polyurethane anti-slip layer.

[0029] Compared with the existing technology, the beneficial effect of the present invention is that, through the three-level collaborative control architecture of intelligent diagnosis of beating causes-dynamic partition positioning-precise marking execution, it creatively solves the problem of laser marking quality degradation caused by plate beating in high-speed transmission scenarios. Different from traditional static or simple speed synchronization solutions, the system first captures the sudden change position of the plate elevation in real time in the beating analysis area and synchronously associates the state of the transmission roller to accurately distinguish the root cause of the beating (plate deformation / roller system abnormality); then, according to the diagnosis results, it dynamically generates an avoidance strategy in the marking area (expansion of the deformation area / contraction of the edge of the abnormal area); finally, combined with surface image analysis, it locks the micro-flat area to perform adaptive focus marking. This closed-loop mechanism significantly improves the marking clarity, position accuracy and depth consistency while maintaining the continuous operation of the production line, breaking through the bottleneck of the existing technology that efficiency and quality cannot be achieved at the same time.

[0030] Furthermore, the present invention, based on the dual-source inducement judgment mechanism of the beating analysis area, accurately locks the root cause of the beating by synchronously analyzing the sudden change characteristics of the deformation profile curvature and the excessive timing of the phase difference between the rollers; combined with the differentiated avoidance strategy of the marking and positioning module: a "curvature / sudden change intensity-safety distance" positive correlation model is adopted for plate deformation to ensure that the marking point is away from the stress concentration area; a "synchronous abnormality degree-edge distance" negative correlation model is adopted for roller system abnormalities to shrink the marking area to the front section of the plate where the transmission disturbance is the smallest; the core inducements of defocus and position offset are avoided from a physical level, so that the laser landing point is always in the deformation influence attenuation zone or the transmission disturbance shielding zone, fundamentally ensuring the clarity, positioning accuracy and depth uniformity of the marking pattern.

[0031] Furthermore, the present invention's state perception module uses a non-contact, high-speed linear array CCD camera to capture real-time images of both sides of the sheet. The state analysis module processes contour data and roller parameters in parallel, enabling millisecond-level online diagnosis of runout causes. The marking positioning module uses gridded grayscale variance analysis to quickly locate the optimal flatness point within a candidate area without interrupting the production line's conveyor flow. This eliminates the production capacity losses associated with traditional solutions caused by downtime for stabilization, manual adjustments, or the intervention of complex follower mechanisms. Instead, the present invention directly outputs stable marking results under continuous, high-speed conveyor conditions, improving processing efficiency per unit time by orders of magnitude.

[0032] Furthermore, the present invention makes full use of the existing transmission roller angle sensors and standard industrial vision components of the production line, and realizes vibration compensation through innovative control logic rather than superimposing high-precision mechanical stabilization devices; the Z-axis automatic focusing actuator of the marking module only requires a slight dynamic response, greatly reducing the dependence on high-specification actuators. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural block diagram of a transverse steel plate laser marking system according to an embodiment of the present invention;

[0034] Figure 2 This is a working schematic diagram of a transverse steel plate laser marking system according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the marking area selection according to an embodiment of the present invention.

[0036] In the figure, 1. Upper image acquisition position; 2. Laser marking layout position; 3. Cross-cutting steel plate; 4. Transmission roller; 5. Lower image acquisition position; 6. First distance corresponding to dotted line; 7. Second distance corresponding to dotted line; 8. Candidate area. DETAILED DESCRIPTION

[0037] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0038] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0040] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] See also Figure 1 and Figure 2 As shown, the laser marking system for cross-cut steel plates includes a zoning module, a state sensing module, a state analysis module, a marking positioning module and a laser marking module. The zoning module divides the plurality of transmission rollers for transmitting the cross-cut steel plates into a run-out analysis zone and a laser marking zone in sequence from the front to the back of the process; the state sensing module is used to collect the rotation parameters of each transmission roller, as well as the upper surface image and the lower surface image of the cross-cut steel plate; the state analysis module is configured to obtain, before the cross-cut steel plate is transmitted to the marking verification zone, the following information: the run-out position with the largest elevation fluctuation, the rotation parameters of each transmission roller at the stage when the run-out phenomenon of the run-out position with the largest elevation fluctuation occurs, during the transmission process of the cross-cut steel plate in the run-out analysis zone. and, the lower surface image of the jumping position, the state analysis module determines that the jumping is caused by the unevenness of the lower surface of the horizontal plate based on the acquired parameters, and / or the jumping is caused by abnormal synchronization of the transmission roller; the marking positioning module is configured to execute the following process after the state analysis module completes the judgment: in response to the state analysis module determining that the jumping is caused by the unevenness of the lower surface of the horizontal plate, a marking area is selected based on the upper surface image of the horizontal plate outside the first distance from the jumping position; in response to the state analysis module determining that the jumping is caused by abnormal synchronization of the transmission roller, a marking area is selected within a second distance from the front section of the horizontal plate along the process; the laser marking module is used to focus on the marking area and mark.

[0042] In the above embodiment, the three-level collaborative control architecture of intelligent diagnosis of jitter inducement - dynamic partition positioning - precise marking execution has creatively solved the problem of laser marking quality degradation caused by plate jitter in high-speed transmission scenarios. Different from traditional static or simple speed synchronization solutions, the system first captures the sudden change position of the plate elevation in real time in the jitter analysis area and synchronously associates the state of the transmission roller to accurately distinguish the root cause of the jitter (plate deformation / roller system abnormality); then, based on the diagnosis results, it dynamically generates an avoidance strategy in the marking area (expansion of the deformation area / contraction of the edge of the abnormal area); finally, combined with surface image analysis, it locks the micro-flat area to perform adaptive focus marking. This closed-loop mechanism significantly improves the clarity, position accuracy and depth consistency of the mark while maintaining the continuous operation of the production line, breaking through the bottleneck of the existing technology that cannot achieve both efficiency and quality.

[0043] For more details, see Figure 2 As shown, industrial cameras located at upper and lower image acquisition positions 1 and 5 capture surface images of the cross-cut steel plate 3. The cross-cut steel plate 3 is conveyed by the synchronous rotation of several drive rollers 4. Focusing and laser marking are performed by a laser head and focusing lens located at laser marking position 2. The state perception module captures images of the upper and lower surfaces of the cross-cut steel plate using a high-speed linear array CCD camera, and the focusing lens is equipped with a Z-axis autofocus actuator. The drive rollers are covered with a polyurethane anti-slip layer to reduce vibration.

[0044] Specifically, the state analysis module analyzes the surface image below the beating position:

[0045] Extract the surface profile data of the area directly below the runout position and calculate the local curvature radius distribution of the area in the transmission direction;

[0046] In response to identifying that the curvature radius of at least one continuous contour point is less than a preset threshold and that there is a sudden change in height in the area, the runout is determined to be caused by an uneven surface under the horizontal plate. Conversely, the rotation parameters of each transmission roller are analyzed for the runout position with the largest elevation fluctuation and the stage when the runout phenomenon occurs at the runout position with the largest elevation fluctuation. Specifically, the state perception module collects the surface image below the runout position (acquired by a linear array CCD camera installed under the conveyor belt); uses the Canny edge detection algorithm to extract the contour line of the lower surface of the steel plate; samples the coordinates of the contour points at intervals of 0.5mm along the conveying direction and constructs a contour point sequence. For each contour point Pi, two adjacent points (Pi-2 to Pi+2) are taken to form a local contour segment; the arc is fitted using the least squares method to solve the curvature radius Ri of the local segment; and the curvature radius sequence {R1, R2, ..., Rn} is output along the conveying direction.

[0047] Specifically, the state acquisition module obtains rotation parameters through an angle Hall sensor installed on each transmission roller. The rotation parameters include the angular velocity and rotation angle of the transmission roller.

[0048] Specifically, the specific process of the state analysis module analyzing the rotation parameters of each transmission roller at the jumping position with the largest elevation fluctuation and the jumping phenomenon stage of the jumping position with the largest elevation fluctuation includes:

[0049] Extracting the real-time rotation angle sequence of each transmission roller during the duration of the beating phenomenon;

[0050] Calculate the rotation angle difference between adjacent transmission rollers at the same time and generate the phase difference time series curve between rollers;

[0051] The inter-roller phase difference timing curve is compared with a preset tolerance threshold range. If the continuous exceeding limit sections in the curve cover more than a preset proportion of the duration of the beating phenomenon, it is determined that the beating is caused by abnormal transmission roller synchronization.

[0052] Specifically, the marking module is further configured to determine the first distance, specifically including:

[0053] Extract the surface profile data of the area directly below the beating position and obtain the minimum curvature radius and maximum height mutation value of the area;

[0054] Selecting the first distance within an optional range based on the minimum curvature radius value and the maximum height mutation value;

[0055] Among them, the first distance is negatively correlated with the minimum curvature radius value and positively correlated with the maximum height mutation value. In detail, after determining that the jump is caused by the unevenness of the lower surface of the plate, the minimum safe avoidance distance between the marking area and the deformation area is scientifically quantified to avoid the radiation effect of the deformation stress field on the marking quality. The minimum curvature radius value reflects the degree of stress concentration in the deformation area. The smaller its value, the sharper the local bending, the higher the risk of plastic deformation, and the larger the disturbance radiation range; the maximum height mutation value represents the vertical disturbance intensity of the deformation. The larger its value, the greater the bounce amplitude when passing through the transmission roller, and a larger buffer distance is required; the first distance is dynamically expanded accordingly to form a positive feedback isolation mechanism of deformation intensity and safety distance.

[0056] Specifically, the marking configuration module is further configured to determine the second distance, specifically including: extracting a timing curve of the phase difference between rollers corresponding to the beating caused by the transmission roller synchronization abnormality determined by the state analysis module;

[0057] Dynamically selecting a second distance from a preset distance mapping table based on a ratio of a continuous overrun section in the inter-roller phase difference timing curve covering a duration of a beating phenomenon;

[0058] The value of the second distance is negatively correlated with the ratio value.

[0059] See also Figure 3 As shown, the specific process of the marking positioning module selecting the marking area based on the upper surface image of the horizontal plate includes:

[0060] Within the candidate area determined outside the first distance (the first distance in the figure corresponds to the dotted line 6) and / or within the second distance (the second distance in the figure corresponds to the dotted line 7), if the candidate area is determined based only on the first distance, then it is a combination of the candidate area 8 in the figure and the area delineated by the second distance; if it is determined based only on the second distance or based on the first distance and the second distance, then the candidate area is the area delineated by the second distance. After determining the candidate area, grayscale processing and edge detection are performed on the surface image above the candidate area to segment the effective area of the plate;

[0061] Perform gridding and block processing on the effective area and calculate the grayscale variance value of each grid cell;

[0062] The continuous grid cell cluster with the smallest grayscale variance value is selected as the marking area.

[0063] The flowchart or block diagram in the accompanying drawings illustrates the possible implementation architecture, functions and operations of the device, method and computer program product according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0064] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cross-cutting steel plate laser marking system, characterized in that: include: The zone division module divides the transmission rollers that convey the cross-cut steel plates into the runout analysis zone and the laser marking zone from the front to the back of the process; A state sensing module is used to collect the rotation parameters of each transmission roller, as well as the upper surface image and the lower surface image of the cross-cutting steel plate; The state analysis module is configured to obtain, before the cross-cut steel plate is conveyed to the marking verification area, the following information during the conveyance of the cross-cut steel plate in the runout analysis area: the runout position with the largest elevation fluctuation, the rotation parameters of each transmission roller during the runout phenomenon at the runout position with the largest elevation fluctuation, and the surface image below the runout position. Based on the obtained parameters, the state analysis module determines whether the runout is caused by unevenness of the lower surface of the cross-cut plate and / or whether the runout is caused by abnormal synchronization of the transmission rollers. The marking positioning module is configured to execute the following process after the state analysis module has made a determination: in response to the state analysis module determining that the beating is caused by the unevenness of the lower surface of the horizontal plate, select a marking area based on the upper surface image of the horizontal plate at a first distance from the beating position; in response to the state analysis module determining that the beating is caused by the abnormal synchronization of the transmission roller, select a marking area within a second distance from the front section of the horizontal plate along the process; The laser marking module is used to focus on the marking area and mark it.

2. The cross-cutting steel plate laser marking system according to claim 1 is characterized in that: The state analysis module analyzes the surface image below the beating position: Extract the surface profile data of the area directly below the runout position and calculate the local curvature radius distribution of the area in the transmission direction; In response to identifying that the curvature radius of at least one continuous contour point is smaller than a preset threshold and there is a sudden change in height in the area, it is determined that the jump is caused by the unevenness of the lower surface of the horizontal plate; conversely, the rotation parameters of each transmission roller are analyzed at the jumping position with the largest elevation fluctuation and the stage when the jumping phenomenon occurs at the jumping position with the largest elevation fluctuation.

3. The cross-cutting steel plate laser marking system according to claim 2, characterized in that: The state acquisition module obtains rotation parameters through the angle Hall sensors installed on each transmission roller. The rotation parameters include the angular velocity and rotation angle of the transmission roller.

4. The cross-cutting steel plate laser marking system according to claim 3, characterized in that: The specific process of the state analysis module analyzing the rotation parameters of each transmission roller at the jumping position with the largest elevation fluctuation and the jumping phenomenon stage of the jumping position with the largest elevation fluctuation includes: Extracting the real-time rotation angle sequence of each transmission roller during the duration of the beating phenomenon; Calculate the rotation angle difference between adjacent transmission rollers at the same time and generate the phase difference time series curve between rollers; The inter-roller phase difference timing curve is compared with a preset tolerance threshold range. If the continuous exceeding limit sections in the curve cover more than a preset proportion of the duration of the beating phenomenon, it is determined that the beating is caused by abnormal transmission roller synchronization.

5. The cross-cutting steel plate laser marking system according to claim 4, characterized in that: The marking module is further configured to determine the first distance, specifically comprising: Extract the surface profile data of the area directly below the beating position and obtain the minimum curvature radius and maximum height mutation value of the area; Selecting the first distance within an optional range based on the minimum curvature radius value and the maximum height mutation value; The first distance is negatively correlated with the minimum curvature radius value and positively correlated with the maximum height mutation value.

6. The cross-cut steel plate laser marking system according to claim 5, characterized in that: The marking configuration module is further configured to determine the second distance, specifically including: extracting a timing curve of the phase difference between rollers corresponding to the beating caused by the transmission roller synchronization abnormality determined by the state analysis module; Dynamically selecting a second distance from a preset distance mapping table based on a ratio of a continuous overrun section in the inter-roller phase difference timing curve covering a duration of a beating phenomenon; The value of the second distance is negatively correlated with the ratio value.

7. The cross-cutting steel plate laser marking system according to any one of claims 5 or 6, characterized in that: The specific process of the marking positioning module selecting the marking area based on the upper surface image of the horizontal plate includes: In the candidate area determined outside the first distance and / or within the second distance, grayscale processing and edge detection are performed on the upper surface image to segment the effective area of the plate; Perform gridding and block processing on the effective area and calculate the grayscale variance value of each grid cell; The continuous grid cell cluster with the smallest grayscale variance value is selected as the marking area.

8. The cross-cut steel plate laser marking system according to claim 1, characterized in that: The device for collecting the upper surface image and the lower surface image of the cross-cutting steel plate in the state perception module is a high-speed linear array CCD camera.

9. The cross-cutting steel plate laser marking system according to claim 1, characterized in that: The laser marking module includes a laser head and a focusing lens, and the focusing lens is equipped with a Z-axis automatic focusing actuator.

10. The cross-cut steel plate laser marking system according to claim 1, characterized in that: The surface of the transmission roller is covered with a polyurethane anti-skid layer.

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