Non-contact plate surface flatness detection equipment and detection method

Abstract

The invention discloses a non-contact plate surface flatness detection device and method, and belongs to the technical field of plate flatness detection. The device comprises a test board, a support frame, a detection assembly, a calibration assembly, a data processor and a controller, wherein a board conveying mechanism is mounted on the test board; the detection assembly comprises a sliding driving mechanism, a sliding frame and a working distance measuring instrument, the working distance measuring instrument is installed on the sliding frame, and the measuring end of the working distance measuring instrument corresponds to the test board; the calibration assembly comprises a reference plate and a reference range finder. The reference plate is detachably installed on the test bench. The reference range finder and the working range finder are arranged at an interval and are installed on the carriage, and the measuring ends of the reference range finder and the working range finder are arranged corresponding to the reference plate. Before measurement, the calibration assembly can be used for calibrating the working range finder, a measurement basis is provided for subsequent measurement work, and the situation that the measurement precision is affected due to the fact that installation is not in place or the connecting part of the sliding frame and the cross beam is abraded is avoided, so that the accuracy of plate flatness detection is improved.

Description

Technical Field

[0001] This invention relates to the field of sheet material flatness testing technology, and more specifically to a non-contact sheet material surface flatness testing device and testing method. Background Technology

[0002] Foam boards (such as polystyrene foam and polyurethane foam) are widely used in building insulation, packaging cushioning, and decorative materials. Their surface flatness directly affects the product assembly quality, aesthetics, and functionality. Currently, flatness testing technologies are mainly divided into two categories: contact and non-contact. However, both have significant limitations when applied to foam boards.

[0003] Contact inspection methods use probes or profilometers to directly contact the surface and measure height changes (such as contact profilometry). This method is commonly used in hard materials such as metals and ceramics, but foam boards are soft and easily deformed, and contact pressure can cause surface indentations or structural damage, introducing measurement errors. Furthermore, contact inspection is inefficient and unsuitable for mass production scenarios.

[0004] Non-contact inspection methods employ non-contact technologies (such as laser scanning, optical interferometry, and structured light projection) to acquire the three-dimensional morphology of a surface through optical or laser means, avoiding physical contact. Some existing inspection equipment improves inspection efficiency by mounting a laser scanner on a moving frame and scanning above the material. However, the moving connection parts are prone to wear during long-term operation, thus affecting the accuracy of the measurement results.

[0005] Therefore, how to provide an efficient and high-precision non-contact plate surface flatness testing device and method is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention aims to provide a non-contact plate surface flatness detection device and method to at least partially solve the technical problems of low detection efficiency and low detection accuracy in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A non-contact sheet metal surface flatness testing device includes: A test stand, on which a plate conveying mechanism is installed; The support frame includes uprights arranged on both sides of the test bench along the conveying direction perpendicular to the plate conveying mechanism and a crossbeam for connecting the uprights on both sides. The detection assembly includes a sliding drive mechanism, a carriage, and a working rangefinder. The sliding drive mechanism is fixed on the crossbeam. The carriage is slidably mounted on the crossbeam along the conveying direction perpendicular to the plate conveying mechanism and is connected to the output end of the sliding drive mechanism. The working rangefinder is mounted on the carriage, and its measuring end is arranged corresponding to the test platform. The calibration assembly includes a reference plate and a reference rangefinder. The reference plate is detachably mounted on the test bench. The reference rangefinder and the working rangefinder are arranged at intervals and mounted on the carriage, with their measuring ends corresponding to the reference plate. A data processor electrically connected to the reference rangefinder and the working rangefinder to analyze and process their measurement results; The controller is electrically connected to the sliding drive mechanism, the reference rangefinder, the working rangefinder, and the data processor.

[0008] The beneficial effects that this invention can achieve are: before measurement, the working rangefinder can be calibrated using the calibration component, providing a measurement basis for subsequent measurement work, avoiding the impact on measurement accuracy due to improper installation or wear at the connection between the carriage and the crossbeam, thereby improving the accuracy of plate flatness detection.

[0009] Furthermore, the reference rangefinder is a contact measuring instrument.

[0010] Furthermore, the working rangefinder is a laser rangefinder.

[0011] Furthermore, multiple working rangefinders are provided, and these multiple working rangefinders are evenly spaced on the slide along the length direction of the crossbeam.

[0012] Furthermore, the distance between adjacent working rangefinders is 10-12 mm.

[0013] Furthermore, a position sensor electrically connected to the controller is installed on the carriage to detect the relative position of the carriage and the crossbeam.

[0014] Furthermore, an alarm is also provided, which is electrically connected to the controller.

[0015] Furthermore, the column is a telescopic rod.

[0016] A non-contact method for detecting the surface flatness of sheet materials, using the aforementioned non-contact sheet material surface flatness detection equipment, includes the following steps: S1. Before the test, a reference plate with known flatness is installed on the test table, and the plane of the reference plate is measured using a reference rangefinder to obtain the reference flatness. S2. The controller is used to compare the flatness of the reference flatness with the actual flatness of the known reference plate. If the error is within the set range, the measurement begins. If the error exceeds the set range, the working setting value of the working rangefinder is readjusted according to the magnitude of the error to compensate for the error. S3. During measurement, remove the reference plate, place the material to be measured, and use the slide to drive the working rangefinder to reciprocate, thereby measuring the height of each point on the surface of the material to be measured. The measurement results are transmitted to the data processor, which analyzes and processes the data measured by the working rangefinder and compares it with the working set value to determine whether the measured flatness is within the set range, thereby determining whether the flatness of the material to be measured is qualified.

[0017] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a non-contact plate surface flatness detection device and detection method. Before measurement, calibration components can be used for calibration, providing a measurement basis for subsequent measurement work and avoiding the impact on measurement accuracy due to improper installation or wear at the connection between the carriage and the crossbeam, thereby improving the accuracy of plate flatness detection. During measurement, the height data transmitted by the laser rangefinder can be integrated and analyzed, and compared with the working set value to determine whether the flatness of the plate under test is qualified. Attached Figure Description

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

[0019] Figure 1 This is a schematic diagram of a non-contact plate surface flatness testing device provided by the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention. In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Please see Figure 1 This invention discloses a non-contact sheet material surface flatness testing device, comprising: Test bench 1, on which a plate conveying mechanism 11 is installed; Support frame 2, the support frame 2 includes columns 21 arranged on both sides of the test table 1 along the conveying direction of the vertical plate conveying mechanism 11 and crossbeams 22 for connecting the columns 21 on both sides; The detection component 3 includes a sliding drive mechanism 31, a carriage 32, and a working rangefinder 33. The sliding drive mechanism 31 is fixed on the crossbeam 22. The carriage 32 is slidably installed on the crossbeam 22 along the conveying direction of the vertical plate conveying mechanism 11 and is connected to the output end of the sliding drive mechanism 31. The working rangefinder 33 is installed on the carriage 32, and its measuring end is arranged corresponding to the test platform 1. The calibration assembly includes a reference plate and a reference rangefinder 4. The reference plate is detachably mounted on the test bench 1. The reference rangefinder 4 and the working rangefinder 33 are arranged at intervals and mounted on the carriage 32, and their measuring ends are arranged corresponding to the reference plate. A data processor is electrically connected to the reference rangefinder 4 and the working rangefinder 33 to analyze and process their measurement results; The controller is electrically connected to the sliding drive mechanism 31, the reference rangefinder 4, the working rangefinder 33, and the data processor.

[0023] Before measurement, calibration components can be used for calibration, providing a measurement basis for subsequent measurement work and avoiding situations such as improper installation or wear at the connection between the carriage 32 and the crossbeam 22 that could affect measurement accuracy, thereby improving the accuracy of plate flatness detection.

[0024] The reference plate is a rigid plate with a highly flat surface. The reference rangefinder 4 is a high-precision contact measuring instrument, mainly used for calibration work, not for actual measurement. Furthermore, the thickness of the reference plate is greater than the thickness of the foam board to be measured, ensuring a gap of approximately 180mm-200mm between the foam board and the reference rangefinder 4 during measurement to prevent collisions.

[0025] The working rangefinder 33 is a laser rangefinder. It uses a non-contact laser rangefinder to measure the flatness of the board material, avoiding affecting the quality of the foam board and improving the detection efficiency and accuracy.

[0026] Multiple working rangefinders 33 are provided, and they are evenly spaced along the length of the crossbeam 22 on the slide 32. The reference rangefinder is installed near the end of the slide 32. By using multiple working rangefinders 33, the plate material 5 to be measured can be scanned and measured simultaneously, improving measurement accuracy and avoiding errors caused by equipment failure or other reasons due to a single working rangefinder 33.

[0027] The distance between adjacent working rangefinders 33 is 10-12mm.

[0028] The test bench 1 is equipped with a sheet material conveying mechanism 11, and the conveying direction of the sheet material conveying mechanism 11 is arranged perpendicular to the sliding direction of the slide 32. The sheet material conveying mechanism 11 can be used to convey the sheet material to achieve continuous measurement of the entire sheet surface, thereby accelerating the measurement efficiency.

[0029] A position sensor is installed on the carriage 32 to detect the relative position of the carriage 32 and the crossbeam 22. The position sensor includes a start / stop switch, a left-position switch installed at the left end of the carriage 32, and a right-position switch installed at the right end of the carriage 32. Each switch can be a contact or non-contact switch as used in the prior art to indicate whether the carriage 32 has slid into position.

[0030] In some embodiments, an alarm is also provided, which is electrically connected to the controller. The alarm may be any form of alarm device, such as a buzzer alarm or an audible and visual alarm, to sound an alarm when a failure is detected.

[0031] In some embodiments, the column 21 is a telescopic rod that can adjust the height of the working rangefinder 33 to accommodate plates of different thicknesses.

[0032] S1. Before testing, adjust the height of the column 21 according to the thickness of the plate 5 to be tested, and then install the reference plate with known flatness on the test table 1. Use the reference rangefinder 4 to measure the plane of the reference plate to obtain the reference flatness. S2. The controller is used to compare the flatness of the reference flatness with the actual flatness of the known reference plate. If the error is within the set range, the measurement begins. If the error exceeds the set range, the working setting value of the working rangefinder 33 is readjusted according to the magnitude of the error to compensate for the error, and the measurement begins again. S3. During measurement, the reference plate is removed, the plate to be measured 5 is placed, and the slide 32 is used to drive the working rangefinder 33 to reciprocate, thereby reciprocating the height of each point on the surface of the plate to be measured 5 and transmitting the measurement results to the data processor. The data processor analyzes and processes the data measured by the working rangefinder 33 and compares it with the working set value to determine whether the measured flatness is within the set range, thereby determining whether the flatness of the plate to be measured 5 is qualified.

[0033] In both the initial and final states, the slide 32 is positioned in the middle of the crossbeam 22. During measurement, the position parameters at both ends of the slide 32 are determined by the distances from the leftmost laser measuring instrument to the leftmost side of the foam and the rightmost laser measuring instrument to the rightmost side of the foam. After setting the position parameters for the left and right movement of the slide 32 (measurable foam width range 905mm-2200mm), the laser rangefinders on the slide 32 will move left and right under the drive of the sliding drive mechanism 31, thereby reciprocating to measure the height of each point on the foam surface. For foams with different moving speeds, the left and right moving rate of the slide 32 can be set (maximum speed 100m / min) to ensure that the height of each point on the foam can be accurately measured during movement.

[0034] During data processing, the data processor integrates and analyzes height data from multiple laser rangefinders, plotting it into curves or bar charts. The height data for each measurement point is also displayed below, providing a visual representation of the results and facilitating understanding of the foam board's surface condition for staff. When a point is detected exceeding the height limit, the curve or bar chart for that point turns red and is accompanied by a buzzer alarm, alerting nearby staff to mark the non-compliant foam and ensure proper differentiation in the next process. The data processing unit's backend stores the locations of height-exceeding points and the detection time. If unmarked non-compliant foam is subsequently found, staff can easily review the stored data to determine if the laser rangefinder detected the non-compliant foam at that height.

[0035] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-contact sheet metal surface flatness testing device, characterized in that, include: Test bench (1), on which a plate conveying mechanism (11) is installed; Support frame (2), the support frame (2) includes columns (21) arranged on both sides of the test bench (1) along the conveying direction perpendicular to the plate conveying mechanism (11) and crossbeams (22) for connecting the two columns (21). The detection component (3) includes a sliding drive mechanism (31), a carriage (32), and a working rangefinder (33). The sliding drive mechanism (31) is fixed on the crossbeam (22). The carriage (32) is slidably mounted on the crossbeam (22) along the conveying direction perpendicular to the plate conveying mechanism (11) and is connected to the output end of the sliding drive mechanism (31). The working rangefinder (33) is mounted on the carriage (32), and its measuring end is arranged corresponding to the test platform (1). The calibration assembly includes a reference plate and a reference rangefinder (4). The reference plate is detachably mounted on the test bench (1). The reference rangefinder (4) and the working rangefinder (33) are arranged at intervals and mounted on the carriage (32), and their measuring ends are arranged corresponding to the reference plate. A data processor electrically connected to the reference rangefinder (4) and the working rangefinder (33) to analyze and process their measurement results; The controller is electrically connected to the sliding drive mechanism (31), the reference rangefinder (4), the working rangefinder (33), and the data processor.

2. The non-contact plate surface flatness testing device according to claim 1, characterized in that, The reference rangefinder (4) is a contact measuring instrument.

3. The non-contact sheet metal surface flatness testing device according to claim 1, characterized in that, The working rangefinder (33) is a laser rangefinder.

4. The non-contact sheet metal surface flatness testing device according to claim 1, characterized in that, The working rangefinder (33) is provided in multiple units, and the multiple working rangefinders (33) are evenly spaced on the slide (32) along the length direction of the crossbeam (22).

5. The non-contact plate surface flatness testing device according to claim 4, characterized in that, The distance between adjacent working rangefinders (33) is 10-12 mm.

6. The non-contact sheet metal surface flatness testing device according to claim 1, characterized in that, The slide (32) is equipped with a position sensor electrically connected to the controller to detect the relative position of the slide (32) and the crossbeam (22).

7. The non-contact plate surface flatness testing device according to claim 1, characterized in that, An alarm is also provided, which is electrically connected to the controller.

8. The non-contact sheet metal surface flatness testing device according to claim 1, characterized in that, The column (21) is a telescopic rod.

9. A non-contact method for detecting the surface flatness of sheet metal, using the non-contact sheet metal surface flatness detection equipment according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Before the test, a reference plate with known flatness is installed on the test bench (1), and the plane of the reference plate is measured by the reference rangefinder (4) to obtain the reference flatness. S2. The controller is used to compare the flatness of the reference flatness with the actual flatness of the known reference plate. If the error is within the set range, the measurement begins. If the error exceeds the set range, the working setting value of the working rangefinder (33) is readjusted according to the magnitude of the error to compensate for the error. S3. During measurement, remove the reference plate and place the plate to be measured (5). Use the slide (32) to drive the working distance measuring instrument (33) to reciprocate, so as to reciprocate the height of each point on the surface of the plate to be measured (5) and transmit the measurement results to the data processor. The data processor analyzes and processes the data measured by the working distance measuring instrument (33) and compares it with the working set value to determine whether the measured flatness is within the set range, so as to determine whether the flatness of the plate to be measured (5) is qualified.

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