High-precision standard plate thickness fixed-point measurement and compensation system and method

Abstract

The invention provides a high-precision standard plate thickness fixed-point measurement and compensation system and method. The system comprises a base; the two-dimensional object carrying movement module is mounted on the base; the concentric-square-shaped support is fixed to the base and spans the two-dimensional object carrying movement module; the net-shaped precise object carrying platform is arranged on the two-dimensional object carrying motion module and is used for carrying a to-be-measured workpiece and accurately positioning the position of a measuring point; the first laser sensor and the second laser sensor are arranged on the upper side and the lower side of the concentric-square-shaped support; and the control system is in communication connection with the two-dimensional loading motion module, the first laser sensor and the second laser sensor, and is used for controlling the two-dimensional loading motion module to move, accurately positioning the position of the measuring point and calculating the thickness of the workpiece to be measured. A high-precision standard plate thickness fixed-point measurement and compensation system is formed through the high-precision laser sensor, the net-shaped precise object carrying platform and the control system, and the contour of a workpiece to be measured can be described.

Description

Technical Field

[0001] This application relates to the field of non-contact measurement technology, specifically to a high-precision standard plate thickness fixed-point measurement and compensation system and method. Background Technology

[0002] With the continuous development of materials and advanced manufacturing processes, special steel plates are widely used in high-end precision equipment, covering many fields such as marine, agriculture, aerospace, and national defense. During the manufacturing process of special steel plates, deformation caused by internal structural compression results in a certain deviation between the thickness and the ideal value. Therefore, performing micron- or even sub-micron-level precision measurements on special steel plates, especially thickness standard plates, is a crucial step in improving their production quality.

[0003] Existing methods for measuring steel plate thickness mainly include direct contact measurement, ultrasonic measurement, and laser measurement. Patents CN209820351U and CN209259519U use direct contact to measure steel plates of different sizes and thicknesses. While flexible mechanical structure design makes measurement more convenient, contact measurement inevitably introduces contact deformation, leading to measurement errors. Patent 209840988U uses an ultrasonic measuring probe for steel plate thickness measurement. Compared to contact measurement, this method avoids measurement errors caused by contact deformation; however, the accuracy of ultrasonic measurement still cannot meet the requirements of ultra-high precision measurements.

[0004] Laser measurement, as the most accurate non-contact measurement method, has been increasingly popularized and promoted in recent years. However, existing solutions still have significant shortcomings. For example, the solution disclosed in patent number CN110732569A calculates thickness by collecting distance differences using paired laser rangefinders. However, its system is fragmented: the rangefinders, PLC control module, signal acquisition unit, and human-machine interface are arranged independently. This not only results in complex wiring and a large space occupation but also fails to achieve integrated sensing, signal processing, and control. Furthermore, it does not consider the influence of ambient temperature on the laser path, making it difficult to consistently achieve micron-level measurement accuracy. More importantly, this type of solution lacks a precise positioning structure for fixed-point measurement and does not include specific compensation functions for factors such as the unevenness of the loading platform, thus failing to meet the high-precision calibration requirements of thickness standard plates for specific measurement points. Summary of the Invention

[0005] In view of the shortcomings of existing technologies, such as lack of fixed-point measurement capability, lack of dedicated compensation mechanism, reliance on constant temperature environment and insufficient measurement accuracy, the purpose of this application is to provide a system and method with high-precision fixed-point measurement of standard plate thickness, non-flatness compensation, temperature self-compensation and contour drawing functions.

[0006] A first aspect of this application provides a high-precision standard plate thickness positioning measurement and compensation system, comprising: Base; a two-dimensional object-carrying motion module, mounted on the base; A U-shaped bracket is fixed on the base and spans the two-dimensional load-carrying motion module; A mesh precision loading platform is mounted on the two-dimensional loading motion module to support the workpiece to be measured and to accurately position the measuring points. The first laser sensor and the second laser sensor are disposed on the upper and lower sides of the U-shaped bracket; The control system is communicatively connected to the two-dimensional object motion module, the first laser sensor, and the second laser sensor, and is used to control the movement of the two-dimensional object motion module, accurately locate the measuring point, and calculate the thickness of the workpiece to be measured.

[0007] Optionally, the control system is specifically configured to: complete the laser sensor calibration using the measurement results of the standard gauge block at the center of the upper edge of the mesh precision carrier platform, and use it as the in-situ positioning reference; perform real-time compensation for the non-flatness deviation of the mesh precision carrier platform for the measurement results at other positions; and drive the mesh precision carrier platform to scan the workpiece to be tested to form the contour curve of the workpiece to be tested.

[0008] Optionally, the first laser sensor and the second laser sensor are equipped with a temperature self-compensation module, which contains a compensation algorithm to offset the impact of ambient temperature changes on measurement accuracy.

[0009] Optionally, the mesh precision loading platform has a mesh or grid structure, and adopts a distribution design of hollow mesh nodes and non-hollow support nodes; The hollowed-out mesh nodes are used to ensure unobstructed beam transmission between the first laser and the second laser; the non-hollowed-out support nodes are the bearing areas for preset measurement points. The central positioning point of the upper edge is a physical reference position and is marked with a positioning mark.

[0010] Optionally, the mesh precision carrier platform is provided with a template cover plate and a magnetic clamp that match the placement slot of the workpiece to be tested; The magnetic clamp is mounted on the template cover plate and is used to fix the standard gauge block at the positioning origin during in-situ measurement. In conjunction with the measurement of the standard gauge block at the positioning origin, the calibration and in-situ reference of the first laser sensor and the second laser sensor are established, and the position of the fixed-point measurement is calibrated.

[0011] Optionally, the specific logic for the non-flatness deviation compensation of the loading platform is as follows: the control system first controls the two-dimensional loading motion module to move the positioning origin to the measurement area of ​​the first laser sensor and the second laser sensor, and completes the calibration and obtains the measurement reference value through the standard gauge block fixed at this position; during subsequent measurements, according to the coordinate offset of the measuring point relative to the positioning origin, the corresponding parameters in the pre-established non-flatness error map are retrieved, and the thickness measurement value of the measuring point is corrected in real time in combination with the reference value.

[0012] Optionally, the first adjustment mechanism includes a first Z-axis adjustment mechanism and a first Y-axis adjustment mechanism, and the second adjustment mechanism includes a second Z-axis adjustment mechanism and a second Y-axis adjustment mechanism; the upper and lower sides of the U-shaped bracket are provided with a first back plate and a second back plate, the first Z-axis and first Y-axis adjustment mechanisms and the first laser sensor are fixed on the first back plate, the second Z-axis and second Y-axis adjustment mechanisms and the second laser sensor are fixed on the second back plate, and the two laser sensors are symmetrically arranged on the U-shaped bracket through the back plate. The adjustment mechanism is used to control the corresponding laser sensor to make fine adjustments in the Z-axis and Y-axis to ensure that the optical path is coaxial.

[0013] Optionally, the two-dimensional object motion module includes an X-axis lead screw and a Y-axis grating linear guide, which are connected to the mesh precision object platform to achieve high-precision movement in the X and Y directions and ensure the coordinate accuracy of the measuring point relative to the positioning origin.

[0014] Optionally, the contour curve of the workpiece to be measured is achieved by the following method: the control system presets a scanning range, drives the two-dimensional object motion module to drive the mesh precision object platform to move point by point, collects the accurate thickness value of each measuring point and the coordinate information relative to the positioning origin, and fits to form the complete contour curve of the object to be measured.

[0015] A second aspect of this application provides a measurement method based on the high-precision standard plate thickness fixed-point measurement and compensation system, comprising: Place the workpiece to be tested into the template cover plate placement slot; The two laser sensors are adjusted to be symmetrical and coaxial in optical path by a fine-tuning mechanism; The standard gauge block is placed at the center of the edge of the mesh precision carrier platform and fixed by a magnetic clamp. It is then moved to the measurement area of ​​the laser sensor, and the measured value of the standard gauge block is calculated. The measured value is compared with the actual value of the standard gauge block to obtain the calibration compensation value, which is used to correct the thickness calculation result of the subsequent workpiece to be measured. The two-dimensional object motion module drives the mesh precision object platform to move the target measurement point to the laser sensor measurement area to achieve fixed-point measurement. The measurement values ​​x1 and x2 of the two sensors are read, and the initial thickness d0 = L-(x1+x2) is calculated by combining the fixed distance L after calibration. The error parameters and reference values ​​are called based on the offset of the measuring point coordinates, and the accurate thickness value d is obtained after compensation; the fixed-point measurement and compensation steps are repeated, or the scanning range is set to perform a full-area scan, and the collected data is fitted to form a contour curve.

[0016] The high-precision standard plate thickness positioning measurement and compensation system provided in this application integrates a patented temperature self-compensation module within the first and second laser sensors, eliminating temperature drift errors in real time without a constant temperature environment and ensuring measurement stability under non-constant temperature conditions. Combined with a mesh precision platform, using the center of the upper edge as a reference, it achieves precise positioning of measurement points and fixed spacing calibration of the laser sensors. Simultaneously, the control system, combined with the measurement point coordinate offset and non-flatness error map, performs targeted compensation to eliminate measurement errors introduced by the non-flatness of the platform. The integrated design of the U-shaped bracket and base enhances mechanical rigidity and suppresses vibration and temperature-induced deformation. The two-dimensional motion module composed of an X-axis lead screw and a Y-axis linear guide further ensures movement and positioning accuracy. The control system can also drive the platform to move within a preset range, simultaneously collecting data to fit contour curves, adapting to various scenario requirements. The entire system, through component collaboration, integrates temperature stability, positioning accuracy, error compensation, and anti-interference capabilities to achieve high-precision calibration measurements at the micron and even sub-micron levels, providing a reliable and flexible solution for quality control of special steel plates and thickness standard plates.

[0017] Other technical effects resulting from the additional features will be further illustrated in the corresponding embodiments. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the structure of a high-precision standard plate thickness fixed-point measurement and compensation system according to an exemplary embodiment; Figure 2 This is a cross-sectional view illustrating a high-precision standard plate thickness fixed-point measurement and compensation system according to an exemplary embodiment; Figure 3 This is a diagram of a precision platform for a high-precision standard plate thickness fixed-point measurement and compensation system, according to an exemplary embodiment. Figure 4 This is a flowchart illustrating a measurement method for a high-precision standard plate thickness fixed-point measurement and compensation system according to an exemplary embodiment.

[0019] In the diagram: 1. Base; 2. Two-dimensional object-carrying motion module; 3. U-shaped bracket; 4. Mesh precision object-carrying platform; 5. Template cover plate; 6. Magnetic clamp; 7. Workpiece to be tested; 8. First back plate; 9. Second back plate; 10. First laser sensor; 11. Second laser sensor; 12. First Z-axis adjustment mechanism; 13. First Y-axis adjustment mechanism; 14. Second Z-axis adjustment mechanism; 15. Second Y-axis adjustment mechanism; 16. X-axis lead screw; 17. Y-axis grating linear guide; 18. Control system; 19. Fine-tuning mechanism; 20. First adjustment mechanism; 21. Second adjustment mechanism. Detailed Implementation

[0020] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application. Parts not described in detail in the following embodiments can be implemented using existing technology.

[0021] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0023] In the description of the embodiments in this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.

[0025] In existing technologies, laser thickness measurement systems mostly employ a non-integrated design, exhibiting core defects such as dispersed mechanical structures and poor component coordination. Furthermore, they lack precise positioning structures for fixed-point measurement and dedicated compensation functions for unevenness of the loading platform, resulting in measurement errors typically remaining between 3-5 μm, which is insufficient to meet the high-precision calibration requirements of thickness measurement standard plates. This type of error primarily stems from multiple factors: in non-integrated designs, the laser sensor support is separated from the loading platform, allowing external vibrations to be easily transmitted to the sensor through the base, causing laser path deviation; for example, a 10Hz vibration can introduce approximately 3 μm of instantaneous error. Manual realignment is required when changing the measured component, resulting in approximately 5 μm of manual adjustment error. Different materials exhibit varying degrees of expansion under temperature changes, easily leading to sensor relative position drift. Simultaneously, temperature variations directly affect the measurement accuracy of the laser sensor itself. Based on these issues, this application provides a high-precision standard plate thickness fixed-point measurement and compensation system to specifically address the shortcomings of existing technologies.

[0026] Reference Figure 1 As shown in one embodiment of this application, a calibration system for high-precision standard plate thickness fixed-point measurement and compensation includes: a base 1, a two-dimensional load motion module 2, a U-shaped bracket 3, a mesh precision load platform 4, a first laser sensor 10, a second laser sensor 11, and a control system 18.

[0027] A two-dimensional motion module 2 is mounted on a base 1; a U-shaped bracket 3 is fixed on the base 1 and spans the two-dimensional motion module 2; a mesh precision platform 4 is set on the two-dimensional motion module 2 to support the workpiece 7 to be measured; a first laser sensor 10 and a second laser sensor 11 are set on the upper and lower sides of the U-shaped bracket 3; a control system 18 is communicatively connected to the two-dimensional motion module 2, the first laser sensor 10, and the second laser sensor 11 to control the movement of the two-dimensional motion module 2, accurately locate the measuring point, and calculate the thickness of the workpiece 7 to be measured.

[0028] It should be noted that the base 1 is a highly stable granite base 1, which, combined with the integrated design of the U-shaped bracket 3, improves mechanical rigidity while effectively suppressing deformation caused by external vibration and temperature difference.

[0029] Specifically, the two-dimensional motion module 2 is installed on a highly stable granite base 1, the U-shaped bracket 3 is fixed to the base 1 and spans the two-dimensional motion module 2, and the mesh precision platform 4 is placed on the two-dimensional motion module 2 to support the workpiece 7 to be measured, while simultaneously positioning the measuring point. The first laser sensor 10 and the second laser sensor 11 are symmetrically arranged on the upper and lower sides of the U-shaped bracket 3, each equipped with a fine-tuning mechanism 19 consisting of a first adjustment mechanism 20 and a second adjustment mechanism 21, used to adjust the position of the sensors in different directions to ensure that the optical path is coaxial. Finally, the control system 18 is connected to each component for communication, and through it, the two-dimensional motion module 2 is moved. The thickness of the workpiece 7 to be measured is calculated using the data obtained from the two laser sensors, and deviation compensation and contour drawing are completed.

[0030] In the embodiments described above, a differential overall layout structure is adopted, with a laser sensor arranged on each of the upper and lower sides of the workpiece to be measured. The distance from the laser sensor to the upper and lower surfaces of the template is measured simultaneously, and the thickness of the steel plate is calculated. The mesh precision loading platform 4 is fixed to the two-dimensional loading motion module 2. With the laser sensor probe position fixed, the two-dimensional motion module moves the workpiece 7 to be measured to achieve multi-point dynamic measurement and fixed-point measurement. For steel plates of different thicknesses, relative measurement is achieved by calibrating with customized high-precision gauge blocks of different specifications to ensure absolute measurement accuracy.

[0031] In some specific embodiments of this application, the control system 18 is specifically configured to: complete the laser sensor calibration using the measurement results of the standard gauge block at the center of the upper edge of the mesh precision carrier platform 4 as the in-situ positioning reference; compensate for the non-flatness deviation of the mesh precision carrier platform 4 in real time for the measurement results at other positions; and drive the mesh precision carrier platform 4 to scan the workpiece to be measured to form the contour curve of the workpiece to be measured.

[0032] Among them, the mesh precision loading platform 4 is driven by the two-dimensional loading motion module 2.

[0033] Specifically, the control system 18 executes a precise calibration and compensation process. First, the system precisely places the standard gauge block on the mesh precision platform 4 at a preset "positioning origin" (usually the middle of the upper edge), and drives the laser sensor to perform measurements at this position to complete the calibration. The measurement result at this position is established as the "in-situ positioning reference" for the entire measurement space. Subsequently, when measuring other positions of the workpiece, the system will call this reference data in real time. Since the mesh precision platform 4 itself may have slight deformation or non-flatness deviations, when the platform moves the workpiece to different coordinates through the two-dimensional motion module 2, the system will dynamically calculate and correct the measurement deviation caused by the platform surface error based on this "in-situ positioning reference" and the platform's motion position information, thereby achieving real-time compensation. At the same time, the control system can drive the mesh precision platform 4 to perform scanning motion along a predetermined trajectory, so that the laser sensor continuously acquires a series of measurement points on the workpiece surface and outputs the contour curve of the workpiece to be measured.

[0034] In the above embodiments of this application, a measurement benchmark is established by "in-situ calibration" fixed at the physical origin of the mesh precision carrier platform 4, which improves the consistency and absolute accuracy of the system measurements at different positions and enhances the repeatability of the measurements. The real-time compensation mechanism eliminates error sources caused by the unevenness of the mesh precision carrier platform 4 itself or the external environment, so that the measurement results more realistically reflect the thickness and shape of the workpiece itself, rather than the superposition of platform errors and workpiece features. At the same time, combined with the two-dimensional carrier motion module 2, the measurement is extended from a single point to a line and even a surface, realizing efficient and intuitive evaluation of the workpiece thickness distribution, flatness or specific contours, improving the detection efficiency and the dimensions of data analysis, so that the system can not only perform thickness calibration, but also perform contour scanning and shape analysis.

[0035] In some specific embodiments of this application, the first laser sensor 10 and the second laser sensor 11 are provided with a temperature self-compensation module. The temperature self-compensation module is provided with a compensation algorithm to offset the influence of ambient temperature changes on measurement accuracy.

[0036] Both the first laser sensor 10 and the second laser sensor 11 are provided with a fine-tuning mechanism 19. The fine-tuning mechanism 19 includes a first adjustment mechanism 20 and a second adjustment mechanism 21, which are used to adjust the positions of the first laser sensor 10 and the second laser sensor 11 respectively.

[0037] The temperature self-compensation process of the first laser sensor 10 and the second laser sensor 11 is automatically completed by the internal module. The ambient temperature data is collected through the built-in temperature monitoring unit, and the existing temperature compensation algorithm is called to correct the measured value in real time, thereby eliminating the influence of temperature drift on the measurement accuracy.

[0038] In some specific embodiments of this application, the mesh precision loading platform 4 has a mesh or grid structure, and adopts a distribution design of hollow mesh nodes and non-hollow support nodes; wherein, the hollow mesh nodes are used for unobstructed beams from the first laser 10 and the second laser 11; the non-hollow support nodes are the bearing areas of the preset measurement points; the positioning origin in the middle of the upper edge is the physical reference position and is marked with a positioning mark.

[0039] Specifically, refer to Figure 3 As shown, the mesh precision loading platform 4 has multiple hollowed-out mesh nodes. The hollowed-out mesh nodes include first and second openings of different sizes. The first and second openings are arranged alternately in the length direction of the mesh precision loading platform 4, and the first and second openings are arranged in parallel in the width direction of the mesh precision loading platform 4 to form hollowed-out mesh nodes. Non-hollowed-out support nodes are formed between the first and second openings.

[0040] In the embodiments described above, the platform is constructed as a grid or lattice structure, and the distribution of hollow and non-hollow nodes is precisely planned. The hollow grid nodes ensure that the measuring beams of the upper first laser displacement sensor 10 and the lower second laser displacement sensor 11 can pass through each other without obstruction, achieving high-precision, non-contact thickness measurement. At the same time, the non-hollow support nodes serve as preset measurement point bearing areas, providing a stable support surface for the workpiece to be measured, preventing deformation of the thin plate workpiece due to local suspension, and achieving stable measurement status. Combined with the physical reference position with positioning mark set in the middle of the upper edge, a constant and accurate physical reference origin is provided for the system's sensor calibration, platform error mapping, and the establishment of the measurement coordinate system, improving the convenience of system calibration, the repeatability of measurement results, and the consistency of the reference when compensating for data at different positions.

[0041] In some specific embodiments of this application, the mesh precision platform 4 is provided with a template cover plate 5 that matches the placement slot of the workpiece to be tested and a magnetic clamp 6. The magnetic clamp 6 is set on the template cover plate 5 and is used to fix the standard gauge block at the positioning origin during in-situ measurement. In conjunction with the measurement of the standard gauge block at the positioning origin, the calibration and in-situ reference of the first laser sensor 10 and the second laser sensor 11 are established, and the position of the fixed-point measurement is calibrated.

[0042] Specifically, a template cover plate 5 is first set on the mesh precision loading platform 4, and then set on the two-dimensional loading motion module through the template cover plate 5; at the same time, in order to adapt to the loading and measurement needs of templates of different sizes, template cover plates 5 of different specifications and shapes will be equipped; in addition, a magnetic clamp 6 is set on the mesh precision loading platform 4. When calibrating by obtaining the measurement reference value, the standard gauge block is placed at the positioning origin in the middle of the upper edge, and the standard gauge block is fixed by the magnetic adsorption of the magnetic clamp 6 to prevent it from shifting.

[0043] In the above embodiments of this application, by setting a template cover plate 5 with a matching placement groove, the workpiece 7 to be measured can be accurately positioned, ensuring the accuracy of the measurement start state; by equipping template cover plates 5 of different specifications, the loading and measurement of templates of different sizes can be flexibly handled, expanding the applicability of the system; by setting a magnetic clamp 6, which is specifically used to fix standard gauge blocks, the stability of the benchmark value acquisition and calibration process is ensured, further improving the measurement accuracy.

[0044] In some specific embodiments of this application, the specific logic of non-flatness deviation compensation of the mesh precision loading platform 4 is as follows: the control system 18 first controls the two-dimensional loading motion module 2 to move the positioning origin to the measurement area of ​​the first laser sensor 10 and the second laser sensor 11, and completes the calibration and obtains the measurement reference value through the standard gauge block fixed at this position; during subsequent measurement, according to the coordinate offset of the measuring point relative to the positioning origin, the corresponding parameters in the pre-established non-flatness error map are retrieved, and the thickness measurement value of the measuring point is corrected in real time in combination with the reference value.

[0045] Specifically, firstly, during system initialization, the control system 18 drives the motion module to precisely move the physical positioning origin at the center of the upper edge of the platform 2 to the area of ​​the photoelectric measurement of the first laser sensor 10 and the second laser sensor 11. The sensor is calibrated using a standard gauge block fixed at this point, and the measurement value at this position is recorded as a unified reference value for the entire platform. In actual measurement, when the motion module moves the platform 2 and the workpiece to any point to be measured, the control system 18 will calculate the coordinate offset of the measuring point relative to the positioning origin in real time. Combined with the reference value and the pre-prepared non-flatness error map, the original thickness measurement value of the current measuring point is corrected.

[0046] The embodiments described above in this application transform unavoidable physical platform manufacturing errors (flatness) into quantifiable and traceable digital compensation models. By combining in-situ benchmark calibration with error mapping, the interference of platform surface errors on the results of each measurement point can be proactively and predictively eliminated. This ensures that regardless of the location of the measurement point, the measurement results can be effectively traced back to the same high-precision benchmark, achieving consistency and accuracy across the entire range in complex two-dimensional scanning measurements. This improves the system's repeatability and overall evaluation of complex surface workpieces.

[0047] In some specific embodiments of this application, the first adjustment mechanism 20 includes a first Z-axis adjustment mechanism 12 and a second Z-axis adjustment mechanism 14; the second adjustment mechanism 21 includes a first Y-axis adjustment mechanism 13 and a second Y-axis adjustment mechanism 15.

[0048] The first Z-axis adjustment mechanism 12 and the first Y-axis adjustment mechanism 13 are connected to the first laser sensor 10 and are used to control the first laser sensor 10 to make fine adjustments in the Z and Y directions; the second Z-axis adjustment mechanism 14 and the second Y-axis adjustment mechanism 15 are connected to the second laser sensor 11 and are used to control the second laser sensor 11 to make fine adjustments in the Z and Y directions.

[0049] Specifically, the first adjustment mechanism 20 includes a first Z-axis adjustment mechanism 12 and a second Z-axis adjustment mechanism 14, and the second adjustment mechanism 21 includes a first Y-axis adjustment mechanism 13 and a second Y-axis adjustment mechanism 15. During installation and debugging, the first Z-axis adjustment mechanism 12 and the first Y-axis adjustment mechanism 13 are connected to the first laser sensor 10 to control the first laser sensor 10 to make precise fine-tuning movements in the Z-axis (vertical direction) and the Y-axis (one of the horizontal directions). Similarly, the second Z-axis adjustment mechanism 14 and the second Y-axis adjustment mechanism 15 are connected to the second laser sensor 11 to control the second laser sensor 11 to make precise fine-tuning operations in the Z-axis and Y-axis. During the detection process, the first adjustment mechanism 20 and the second adjustment mechanism 21 ensure that the upper and lower first laser sensors 10 and the second laser sensor 11 are aligned with each other.

[0050] It should be noted that, in specific embodiments, the first adjustment mechanism 20 and the second adjustment mechanism 21 can be adjusted by means of a precision threaded knob combined with a spring or by means of a dovetail groove.

[0051] In the embodiments described above, by equipping the first laser sensor 10 and the second laser sensor 11 with independent Z-axis and Y-axis adjustment mechanisms respectively, the position adjustment of the two laser sensors becomes more flexible and precise. In application, each laser sensor can be independently and meticulously adjusted in the Z-axis and Y-axis according to the actual situation of the workpiece 7 under test and the measurement requirements, ensuring that the two laser sensors can be accurately aligned with the measurement area of ​​the workpiece 7 under test. This effectively reduces measurement errors, improves the accuracy and reliability of thickness measurement, and thus enhances the performance and quality of the entire high-precision standard plate thickness positioning measurement and compensation system.

[0052] In some specific embodiments of this application, a first back plate 8 and a second back plate 9 are provided on the upper and lower sides of the U-shaped bracket 3.

[0053] The first Z-axis adjustment mechanism 12 and the first Y-axis adjustment mechanism 13 are fixed on the first back plate 8, and the second Z-axis adjustment mechanism 14 and the second Y-axis adjustment mechanism 15 are fixed on the second back plate 9.

[0054] It should be noted that the first back plate 8 and the second back plate 9 can be fixed to the U-shaped bracket 3 by bolts or positioning pins.

[0055] In the above embodiments of this application, a first back plate 8 and a second back plate 9 are respectively provided on the upper and lower sides of the U-shaped bracket 3. The first Z-axis adjustment mechanism 12 and the first Y-axis adjustment mechanism 13 are firmly fixedly installed on the first back plate 8, while the second Z-axis adjustment mechanism 14 and the second Y-axis adjustment mechanism 15 are firmly fixedly installed on the second back plate 9. By providing back plates on the upper and lower sides of the U-shaped bracket 3 and fixing the adjustment mechanisms in different directions to the corresponding back plates, the adjustment mechanisms have a stable and independent installation foundation, which can ensure that the adjustment mechanisms do not interfere with each other during operation, thus ensuring the accuracy and stability of adjustment. At the same time, the spatial structure of the U-shaped bracket 3 is reasonably utilized, making the overall device structure more compact and orderly, which is convenient for subsequent debugging and maintenance.

[0056] In some specific embodiments of this application, the first laser sensor 10 is mounted on the first back plate 8, and the second laser sensor 11 is mounted on the second back plate 9; the first laser sensor 10 and the second laser sensor 11 are symmetrically arranged on the U-shaped bracket 3 through the first back plate 8 and the second back plate 9; the first adjustment mechanism 20 and the second adjustment mechanism 21 are respectively used to control the first laser sensor 10 and the second laser sensor 11 to make fine adjustments relative to the U-shaped bracket 3.

[0057] Specifically, before use, the first laser sensor 10 is installed and fixed on the first back plate 8, and the second laser sensor 11 is installed on the second back plate 9. The first laser sensor 10 and the second laser sensor 11 are symmetrically arranged on the U-shaped bracket 3 through the first back plate 8 and the second back plate 9. At the same time, the first adjustment mechanism 20 and the second adjustment mechanism 21 are set and connected to the first laser sensor 10 and the second laser sensor 11 respectively. Through the two adjustment mechanisms, the corresponding laser sensors are controlled to make precise fine-tuning movements relative to the U-shaped bracket 3.

[0058] In the above embodiments of this application, the laser sensors are symmetrically arranged on the U-shaped bracket 3 through the first back plate 8 and the second back plate 9, achieving symmetry in the laser sensor layout and ensuring consistency in data acquisition and analysis. The first adjustment mechanism 20 and the second adjustment mechanism 21 are set up to finely adjust the movement of the two laser sensors relative to the U-shaped bracket 3, which can flexibly and accurately adjust the position of the laser sensors according to actual usage needs, improve the accuracy and reliability of laser sensor measurements, and thus better meet the accuracy requirements of laser measurement in different scenarios.

[0059] In some specific embodiments of this application, the two-dimensional loading motion module 2 includes: an X-axis lead screw 16 and a Y-axis grating linear guide 17, which are connected to the mesh precision loading platform 4 and used to control the high-precision movement of the mesh precision loading platform 4 in the X and Y directions.

[0060] Specifically, a combined design method of "lead screw guide rail" and "grating linear guide rail" is adopted. The lead screw guide rail, i.e., the X-direction lead screw 16, is connected to the base 1 and fixed on the base 1. The grating linear guide rail, i.e., the Y-direction grating linear guide rail 17, is mounted on the base 16. The Y-direction grating linear guide rail 17 can drive the Y-direction grating linear guide rail 17 to move in the X direction. The mesh precision carrying platform 4 is mounted on the Y-direction grating linear guide rail 17. The Y-direction grating linear guide rail can drive the mesh precision carrying platform 4 to move in the Y direction. By adjusting the movement of the Y-direction grating linear guide rail 17 through the X-direction lead screw 16, and adjusting the movement of the mesh precision carrying platform 4 in the Y direction through the Y-direction grating linear guide rail 17, high-precision control of the mesh precision carrying platform 4 in the X and Y directions is achieved, ensuring the coordinate accuracy of the measuring point relative to the positioning origin at the middle of the upper edge.

[0061] It should be noted that the transmission method of the two-dimensional loading motion module 2 can be controlled by a motor and a guide rail. For example, the guide rail of the X-axis lead screw 16 is fixed on the base 1, and the lead screw of the X-axis lead screw 16 is slidably set on the guide rail. Under the control of the motor, the lead screw slides along the guide rail. At the same time, the Y-axis grating linear guide rail 17 is connected to the lead screw and can slide with the lead screw. Secondly, the slide rail of the Y-axis grating linear guide rail 17 is fixed on the lead screw, and the whole can slide with the lead screw in the X direction to realize the adjustment of the mesh precision loading platform 4 in the X direction. The sliding block of the Y-axis grating linear guide rail 17 is fixed on the bottom of the mesh precision loading platform 4, and the sliding block can slide on the slide rail to realize the adjustment of the mesh precision loading platform 4 in the Y direction.

[0062] In the embodiments described above, the measurement module based on a differential layout serves as the main body of the measurement system, comprising a base 1, a mesh precision loading platform 4, a first laser sensor 10 and a second laser sensor 11, a fine-tuning mechanism 19, a U-shaped bracket 3, and a two-dimensional loading motion module 2. The U-shaped bracket 3 reliably fixes the first laser sensor 10 and the second laser sensor 11, offering better rigidity and stability compared to traditional gantry structures. The fine-tuning mechanism 19 can precisely adjust the first laser sensor 10 and the second laser sensor 11 in two directions within the plane and in the rotational dimension around the plane, ensuring that the two lasers are aligned and on the same straight line. The mesh precision loading platform 4 is equipped with template cover plates 5 of different sizes to ensure the loading and measurement accuracy of standard templates of different specifications. The two-dimensional loading motion module 2 moves the workpiece 7 to be measured in the XY direction, achieving multi-point precise measurement and fixed-point measurement. Based on a relative measurement system calibration method, a high-precision gauge block is used as a reference before measurement, and the data from the gauge block is read to calibrate the sensor, ensuring the accuracy of the output thickness value.

[0063] In some specific embodiments of this application, the contour curve of the workpiece to be measured is achieved in the following way: the control system 18 presets the scanning range, drives the two-dimensional object motion module 2 to drive the mesh precision object platform 4 to move point by point, collects the accurate thickness value of each measuring point and the coordinate information relative to the positioning origin, and fits to form the complete contour curve of the object to be measured.

[0064] The embodiments described above in this application upgrade the system from single-point thickness measurement to two-dimensional contour analysis through preset range and point-by-point driven automated scanning. The control system 18 drives the two-dimensional object motion module 2 to ensure that the spatial coordinate information of each measuring point strictly corresponds to the high-precision thickness value obtained through real-time compensation. Based on precise and discrete data points, curve fitting can generate a complete contour curve that reflects the continuous changes in the overall shape and thickness of the workpiece being measured. This improves the detection efficiency, realizes the quantitative evaluation of the workpiece's flatness, slope, and specific contour shape, and provides a digital basis.

[0065] Using the same inventive concept as the above-mentioned technical solution, the second aspect of this application provides a measurement method for a high-precision standard plate thickness fixed-point measurement and compensation system, comprising: S1. Place the workpiece 7 to be tested in the template cover plate 5 placement groove of the mesh precision carrier platform 4; S2. Adjust the positions of the first laser sensor 10 and the second laser sensor 11 through the fine-tuning mechanism 19 so that the two are symmetrical and their optical paths are coaxial. S3. Control the two-dimensional carrier motion module 2 through the control system 18 to move the positioning origin in the middle of the upper edge of the mesh precision carrier platform 4 to the laser sensor measurement area, place the standard gauge block at the positioning origin and fix it with the magnetic clamp 6 to complete the laser sensor fixed spacing calibration. S4. According to the preset measurement point position, control the two-dimensional carrier motion module 2 to drive the mesh precision carrier platform 4 to move to the target measurement point to realize fixed-point measurement; read the measurement value x1 of the first laser sensor 10 and the measurement value x2 of the second laser sensor 11, and combine the fixed distance L after the two are calibrated to calculate the initial thickness d0 of the workpiece 7 to be measured = L-(x1+x2). S5. The control system 18, based on the coordinate offset of the measuring point relative to the positioning origin in the middle of the upper edge, calls the corresponding error parameters and measurement reference values ​​in the pre-established non-flatness error map of the loading platform to compensate for the initial thickness d0 and obtain the accurate thickness value d of the measuring point. S6. Repeat the above fixed-point measurement and compensation steps, or set the scanning range through the control system 18, drive the mesh precision carrier platform 4 to move to achieve fixed-point scanning of the set area, and simultaneously collect the accurate thickness value and coordinate information of each measuring point to fit and form the complete contour curve of the measured object.

[0066] In the embodiments described above, the workpiece to be measured is first fixed on a dedicated platform, and the dual laser sensors are precisely calibrated by placing standard gauge blocks in situ. Then, the platform is driven to a preset measurement point, and the initial thickness is calculated based on the dual-sensor differential measurement principle. A pre-stored platform error map is called in real time, and the initial thickness is dynamically compensated based on the current measurement point coordinates. Spatial coordinates and the compensated thickness value are simultaneously acquired, and a complete contour curve is finally fitted. Through the in-situ calibration-error map compensation logic, the physical deformation error of the platform is eliminated, ensuring the same high-precision benchmark for thickness measurement results at any measurement point, thus improving the accuracy and consistency of the entire measurement range. Simultaneously, combined with high-precision two-dimensional motion control, efficient and multifunctional integration from single-point calibration measurement to automatic scanning contour analysis is achieved, enhancing the system's practicality and reliability in precision industrial inspection.

[0067] In some specific embodiments of this application, a calibration step is included after step S3: The standard gauge block is placed at the origin point in the middle of the upper edge of the mesh precision platform 4 and fixed by the magnetic clamp 6. It is then moved to the measurement area of ​​the laser sensor, and the measured value of the standard gauge block is calculated. The measured value is compared with the actual value of the standard gauge block to obtain the calibration compensation value, which is used to correct the thickness calculation result of the subsequent workpiece 7 to be measured.

[0068] It should be noted that the temperature self-compensation process of the first laser sensor 10 and the second laser sensor 11 is automatically completed by their internally integrated temperature self-compensation module and algorithm, which uses a publicly disclosed patent. No additional operation is required, and the measured value can be corrected in real time when the ambient temperature changes.

[0069] like Figure 2As shown, workpieces 7 of different specifications and sizes are placed in a template cover plate 5 with matching dimensions. The template cover plate 5 is positioned on a mesh precision loading platform 4. The upper laser rangefinder, i.e., the first laser sensor 10, and the lower laser rangefinder, i.e., the second laser sensor 11, are respectively mounted and fixed on the U-shaped bracket 3 through the first back plate 8 and the second back plate 9. The two laser sensors are adjusted to be symmetrical and have coaxial optical paths through the first Z-axis adjustment mechanism 12, the first Y-axis adjustment mechanism 13, the second Z-axis adjustment mechanism 14, and the second Y-axis adjustment mechanism 15. After the system is started, the temperature self-compensation modules of the first laser sensor 10 and the second laser sensor 11 automatically run to offset the influence of ambient temperature in real time; the control system 18 controls the two-dimensional object motion module 2 to move the positioning origin of the upper edge of the mesh precision object platform 4 to the laser sensor measurement area, and places the standard gauge block at the positioning origin and fixes it with the magnetic clamp 6 to calibrate the fixed spacing of the laser sensor. The Y-axis linear guide rail 17 and the X-axis lead screw 16 drive the mesh precision carrier platform 4 to move, so that the target measuring points of the workpiece 7 to be measured enter the measurement area in sequence. The first laser sensor 10 outputs the measured value x1, and the second laser sensor 11 outputs the measured value x2. The initial thickness d0 = L - (x1 + x2) is calculated. The control system 18 calls the reference value and the non-flatness error parameter of the position to compensate for the initial thickness d0 based on the coordinate offset of the measuring point relative to the positioning origin of the upper edge, so as to obtain the accurate thickness value d. Repeat the above steps to complete multi-point measurement, or set the scanning range to perform full-area scanning, and simultaneously collect the accurate thickness value and coordinate information of each measuring point to fit and form the complete contour curve of the object being measured. In the calibration process, the standard gauge block is placed at the center of the upper edge of the mesh precision platform 4 and fixed by the magnetic clamp 6. It is then moved to the laser sensor measurement area, and the measured value of the standard gauge block is calculated. The measured value is compared with the actual value of the standard gauge block to obtain the calibration compensation value, which is used to correct the thickness calculation result of the subsequent workpiece 7 to be measured.

[0070] The high-precision standard plate thickness positioning measurement and compensation system described in the above embodiments of this application achieves a measurement accuracy of 0.3 μm for special standard plate thicknesses. This application utilizes a differential mechanical measurement structure combined with a micro-motion guide rail to achieve laser alignment, improving vibration resistance while eliminating measurement errors caused by steel plate tilting. The laser sensor integrates mature temperature self-compensation technology, eliminating reliance on a constant temperature environment. A non-flatness compensation mechanism effectively offsets platform errors. A relative measurement method overcomes environmental interference and sensor drift, ensuring the accuracy of high-precision standard plate thickness positioning measurement and compensation. This application exhibits excellent adaptability and flexibility, showing broad application prospects in industrial scenarios and easily enabling automated measurement.

[0071] The preferred features in the above embodiments can be used individually in any embodiment, or in any combination thereof, provided they do not conflict with each other. Furthermore, parts not described in detail in the embodiments can be implemented using existing technologies.

[0072] The foregoing has described some specific embodiments of this application. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this application. The above-described preferred features can be used in any combination without conflict.

Claims

1. A high-precision standard plate thickness fixed-point measurement and compensation system, characterized in that, include: Base; a two-dimensional object-carrying motion module, mounted on the base; A U-shaped bracket is fixed on the base and spans the two-dimensional load-carrying motion module; A mesh precision loading platform is mounted on the two-dimensional loading motion module to support the workpiece to be measured and to accurately position the measuring points. The first laser sensor and the second laser sensor are disposed on the upper and lower sides of the U-shaped bracket; The control system is communicatively connected to the two-dimensional object motion module, the first laser sensor, and the second laser sensor, and is used to control the movement of the two-dimensional object motion module, accurately locate the measuring point, and calculate the thickness of the workpiece to be measured.

2. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 1, characterized in that, The control system is specifically configured as follows: the laser sensor is calibrated using the measurement results of the standard gauge block at the center of the upper edge of the mesh precision carrier platform, which serves as the in-situ positioning reference; the non-flatness deviation of the mesh precision carrier platform is compensated in real time for the measurement results at other positions; and the workpiece to be tested is scanned by driving the mesh precision carrier platform to form the contour curve of the workpiece to be tested.

3. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 1, characterized in that, Both the first and second laser sensors are equipped with a temperature self-compensation module, which contains a compensation algorithm to offset the impact of ambient temperature changes on measurement accuracy.

4. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 2, characterized in that, The mesh precision loading platform has a mesh or grid structure and adopts a design that combines hollow mesh nodes with non-hollow support nodes. The hollowed-out mesh nodes are used to ensure unobstructed beam transmission between the first laser and the second laser; the non-hollowed-out support nodes are the bearing areas for preset measurement points. The central positioning point of the upper edge is a physical reference position and is marked with a positioning mark.

5. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 4, characterized in that, The mesh precision carrier platform is equipped with a template cover plate and a magnetic clamp that match the placement slot of the workpiece to be tested. The magnetic clamp is mounted on the template cover plate and is used to fix the standard gauge block at the positioning origin during in-situ measurement. In conjunction with the measurement of the standard gauge block at the positioning origin, the calibration and in-situ reference of the first laser sensor and the second laser sensor are established, and the position of the fixed-point measurement is calibrated.

6. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 2, characterized in that, The specific logic for non-flatness deviation compensation of the mesh precision loading platform is as follows: The control system first controls the two-dimensional loading motion module to move the positioning origin to the measurement area of ​​the first laser sensor and the second laser sensor, and completes the calibration and obtains the measurement reference value through the standard gauge block fixed at this position; during subsequent measurement, according to the coordinate offset of the measuring point relative to the positioning origin, the corresponding parameters in the pre-established non-flatness error map are retrieved, and the thickness measurement value of the measuring point is corrected in real time in combination with the reference value.

7. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 1, characterized in that, The first adjustment mechanism includes a first Z-axis adjustment mechanism and a first Y-axis adjustment mechanism, and the second adjustment mechanism includes a second Z-axis adjustment mechanism and a second Y-axis adjustment mechanism. The upper and lower sides of the U-shaped bracket are provided with a first back plate and a second back plate. The first Z-axis and first Y-axis adjustment mechanisms and the first laser sensor are fixed on the first back plate, and the second Z-axis and second Y-axis adjustment mechanisms and the second laser sensor are fixed on the second back plate. The two laser sensors are symmetrically arranged on the U-shaped bracket through the back plates. The adjustment mechanism is used to control the corresponding laser sensors to make fine adjustments in the Z and Y directions to ensure that the optical path is coaxial.

8. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 1, characterized in that, The two-dimensional object motion module includes an X-axis lead screw and a Y-axis optical grating linear guide, which are connected to the mesh precision object platform to achieve high-precision movement in the X and Y directions and ensure the coordinate accuracy of the measuring point relative to the positioning origin.

9. The high-precision standard plate thickness fixed-point measurement and compensation system according to claim 2, characterized in that, The contour curve of the workpiece to be measured is achieved in the following way: the control system presets the scanning range, drives the two-dimensional object motion module to drive the mesh precision object platform to move point by point, collects the accurate thickness value of each measuring point and the coordinate information relative to the positioning origin, and fits to form the complete contour curve of the object to be measured.

10. A measurement method based on the high-precision standard plate thickness fixed-point measurement and compensation system according to any one of claims 1-9, characterized in that, include: Place the workpiece to be tested into the template cover plate placement slot; The two laser sensors are adjusted to be symmetrical and coaxial in optical path by a fine-tuning mechanism; The standard gauge block is placed at the center of the edge of the mesh precision carrier platform and fixed by a magnetic clamp. It is then moved to the measurement area of ​​the laser sensor, and the measured value of the standard gauge block is calculated. The measured value is compared with the actual value of the standard gauge block to obtain the calibration compensation value, which is used to correct the thickness calculation result of the subsequent workpiece to be measured. The two-dimensional object motion module drives the mesh precision object platform to move the target measurement point to the laser sensor measurement area to achieve fixed-point measurement. The measurement values ​​x1 and x2 of the two sensors are read, and the initial thickness d0 = L-(x1+x2) is calculated by combining the fixed distance L after calibration. The error parameters and reference values ​​are called based on the offset of the measuring point coordinates, and the accurate thickness value d is obtained after compensation; the fixed-point measurement and compensation steps are repeated, or the scanning range is set to perform a full-area scan, and the collected data is fitted to form a contour curve.

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