Metal sheet laser drilling verification tool

Abstract

The present application relates to the technical field of laser drilling verification tool, particularly relates to a kind of metal sheet laser drilling verification tool, it can simultaneously detect aperture is too big, aperture is too small, hole position deviation, hole shape is not round, hole wall quality is bad and other multiple defect types by light ring form fine analysis, realize all-around quality verification, eliminate the subjective difference of artificial detection, guarantee the consistency and repeatability of detection result;It includes base, motorized conveyor belt and cover;Motorized conveyor belt and cover are respectively installed on base;It further includes moving device, cleaning device, conveying device, lifting device, magnetic support table, detection hole, visual camera, detection column and ring lamp;Magnetic support table is arranged in cover interior, and limit groove is arranged at the top end of magnetic support table;Multiple detection holes are arranged at limit groove, and the diameter of detection hole is same with the punching diameter of metal sheet, and the position of detection hole corresponds with the punching position of metal sheet.

Description

Technical Field

[0001] This invention relates to the technical field of laser drilling verification fixtures, and in particular to a laser drilling verification fixture for metal sheets. Background Technology

[0002] In actual laser drilling production, various process parameters of the laser equipment, including laser power, pulse frequency, pulse width, focal position, and auxiliary gas pressure, all have a significant impact on drilling quality. After maintenance, optical lens replacement, or long-term operation, laser parameters often drift, causing the actual drilling effect to deviate from the theoretical expectation. Therefore, before formal mass production, laser drilling tests are usually conducted on metal sheet specimens. By detecting and verifying the hole diameter, hole position, roundness, and hole wall quality, it is confirmed that the laser equipment is in normal working condition and that the various process parameters are set properly. This verification step is of great significance for ensuring the quality of mass production and avoiding batch defects.

[0003] Currently, in the verification and testing process of laser drilling of metal sheets, such as the existing technology announcement number CN220894156U, this invention belongs to the field of laser detection device technology, specifically a laser detection device for detecting multiple apertures, including a body; a support plate is rotatably connected to the body; multiple sets of laser head devices are fixed on the support plate, and the laser head devices are electrically connected to a distance sensing switch; a middle plate is fixed on the support plate, and one end of the laser head device penetrates through the interior of the middle plate.

[0004] Technical defects have been found in the existing device during use: Existing devices have difficulty performing precise quantitative analysis of the shape and positional accuracy of holes, and can only make rough judgments on the hole diameter, which reduces the effectiveness of detecting and verifying various defects such as hole position deviation, non-circular hole shape, and poor hole wall quality. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a metal sheet laser drilling verification fixture that can simultaneously detect multiple defect types, such as excessively large aperture, excessively small aperture, aperture position misalignment, non-circular aperture shape, and poor aperture wall quality, through precise analysis of the aperture morphology. This achieves comprehensive quality verification, eliminates the subjective differences inherent in manual inspection, and ensures the consistency and repeatability of the test results.

[0006] The metal sheet laser drilling verification fixture of the present invention includes a base, an electric conveyor belt and a cover; The electric conveyor belt and the cover are respectively mounted on the base; it also includes a moving device, a cleaning device, a conveying device, a lifting device, a magnetic support platform, a detection hole, a vision camera, a detection column, and a ring light; The magnetic support platform is located inside the cover, and a limiting groove is provided at the top of the magnetic support platform; Multiple sets of detection holes are set in the limiting groove, and the diameter of the detection holes is the same as the diameter of the hole in the metal sheet, and the position of the detection holes corresponds to the position of the hole in the metal sheet; The vision camera is installed inside the housing via a moving device. The moving device is used to move the vision camera to a different position. The vision camera is also connected to a verification system, which is used to verify the quality of the holes drilled on the metal sheet. The cleaning device is mounted on the base and is used to clean the inside of the holes in the metal sheet. A conveying device is mounted on the base and is used to transport the metal sheet. Multiple sets of detection columns and multiple sets of ring lights are respectively installed on the lifting device, which is used to drive the detection columns and ring lights to move up and down. The positions of multiple sets of detection columns correspond to the positional axes of multiple sets of detection holes, and the diameter of the detection columns is smaller than the diameter of the detection holes. The perforated metal sheet is placed on an electric conveyor belt, which moves it to a cleaning device. The cleaning device cleans the inside of the holes in the metal sheet. Then, a conveying device places the metal sheet on the electric conveyor belt into the limiting groove of the magnetic support platform. At this point, the position of the metal sheet is fixed by the limiting groove and magnetic attraction. A lifting device then moves the multiple sets of detection columns upwards, causing the upper parts of the detection columns to pass through the multiple detection holes and extend into the multiple holes of the metal sheet. Due to the position of the multiple sets of detection columns... Corresponding to the position axes of multiple sets of detection holes, when the drilling position of the metal sheet is standard, the detection post is positioned exactly at the center of the hole. Since the diameter of the detection post is smaller than the diameter of the detection hole, the diameter of the detection post is also smaller than the diameter of the hole in the metal sheet. Therefore, an annular gap is formed between the periphery of the detection post and the inner diameter of the hole. Then, multiple sets of ring lights are turned on to illuminate the bottom of multiple sets of detection holes. After the light passes through the annular gap, a halo is formed. At this time, the visual camera is moved to a different position by a moving device to capture the shape of the halo at different positions. The shape of the halo is analyzed by the verification system to verify the standardization of the holes on the metal sheet. This system achieves integrated automatic feeding, positioning, and inspection of metal sheets without manual intervention, significantly improving inspection efficiency. A vision camera is used to acquire high-resolution images of the halo, and a verification system precisely extracts and quantifies multi-dimensional features such as the halo's inner diameter, outer diameter, center position, edge roundness, and continuity. Inspection accuracy reaches the micrometer level, far exceeding manual visual inspection. Through detailed analysis of the halo's morphology, multiple defect types can be detected simultaneously, including excessively large apertures, excessively small apertures, aperture misalignment, non-circular apertures, and poor aperture wall quality. This comprehensive quality verification eliminates the subjective differences inherent in manual inspection, ensuring the consistency and repeatability of inspection results.

[0007] Preferably, the cleaning device includes a bracket, a first lifting platform, a first electric cylinder, brush bristles, a support plate, a first spring, and a vibration motor; The bracket is set at the top of the base; The first lifting platform is slidably mounted on the bracket. The fixed end of the first electric cylinder is mounted on the bracket, and the moving end of the first electric cylinder is connected to the first lifting platform. The bristles are located at the bottom of the support plate; The top of the support plate is mounted on the bottom of the first lifting platform via multiple sets of first springs. A vibration motor is installed on the outer wall of the first lifting platform. The metal sheet is transported to the area below the brush bristles by an electric conveyor belt. Then, the first electric cylinder drives the first lifting platform to move downwards, causing the brush bristles to move downwards as well. When the bottom of the brush bristles comes into contact with the metal sheet, the entire bristles bend and deform. At this time, the brush bristles corresponding to the holes in the metal sheet extend into the holes. Then, the vibration motor is turned on to drive the support plate to vibrate, which in turn causes the support plate to vibrate the brush bristles to clean the inside of the holes in the metal sheet. This prevents debris in the holes from affecting the accuracy of the verification and improves the reliability of the laser drilling verification of the metal sheet.

[0008] Preferably, the lifting device includes a telescopic rod, a second electric cylinder, a support plate, a sleeve, and a second spring; The telescopic rod and the second electric cylinder are both installed on the inner side wall of the base; The support plate is installed on the moving end of the telescopic rod and the second electric cylinder; The bottom ends of multiple sets of sleeves are connected to the top of the support plate, and the lower parts of multiple sets of detection columns are slidably installed on the multiple sets of sleeves. Multiple sets of second springs are respectively installed inside multiple sets of sleeves and provide elastic support for multiple sets of detection columns; Multiple sets of ring lights are mounted on the top of the support plate, surrounding multiple sets of sleeves. The support plate is moved upward by the second electric cylinder, which in turn moves the detection columns upward through the multiple sets of sleeves and multiple sets of second springs. This allows the multiple detection columns to extend into the multiple holes of the metal sheet. When the holes of the metal sheet are misaligned with the positions of the detection columns, the detection columns cannot extend into the holes of the metal sheet, causing the detection columns to slide downward and retract, thus preventing the detection columns from breaking or being damaged.

[0009] Preferably, the conveying device includes a guide frame, a rack, a conveying table, a second lifting platform, a suction cup, a third electric cylinder, and a drive motor; The guide frame is mounted on the outer wall of the base and passes through the inside of the housing; The rack is mounted on the outer wall of the guide frame; The conveyor table is horizontally slidably mounted on the guide frame; The second lifting platform is slidably mounted on the conveyor platform. The suction cup is installed at the bottom of the second lifting platform and is connected to the external suction equipment; The fixed end of the third electric cylinder is installed on the outer wall of the conveyor table, and the moving end of the third electric cylinder is connected to the second lifting platform. The drive motor is installed on the outer wall of the conveyor table. The output end of the drive motor meshes with the rack and pinion through a gear. The drive motor drives the gear to rotate, which in turn meshes with the rack and pinion to drive the conveyor table to slide horizontally. After the conveyor table moves, it drives the second lifting platform to move above the metal sheet. The third electric cylinder drives the second lifting platform to move up and down, which makes it easier for the suction cup to pick up or place the metal sheet, thus improving the convenience of automatic conveying and unloading of metal sheets.

[0010] Preferably, it also includes a purge pipeline; The purging pipeline is installed on the outer wall of the bracket; multiple sets of nozzles are connected to the outer wall of the purging pipeline, and the inlet end of the purging pipeline is connected to an external air supply device; air is supplied to the purging pipeline through the external air supply device, so that the purging pipeline blows and cleans the holes in the metal sheet through the nozzles, thereby improving the cleaning effect.

[0011] Preferably, it also includes a movable seat, a fourth electric cylinder, and guide rollers; Multiple sets of movable seats are slidably mounted on the bracket in opposite directions; Multiple sets of guide rollers are rotatably mounted on multiple sets of movable seats; Multiple sets of fourth electric cylinders are installed on the outer side wall of the bracket, and the moving ends of the multiple sets of fourth electric cylinders are connected to multiple sets of moving seats respectively; when the electric conveyor belt transports the metal sheet, the guide rollers on both sides guide and support the metal sheet, improving the convenience of centering the metal sheet's transport position.

[0012] Preferably, curtains are also included; Curtains are installed on both sides of the enclosure; by setting curtains, the amount of external light entering the enclosure is reduced, thus improving the recognition effect of the halo.

[0013] Preferably, the moving device includes a cross-shaped electric slide and a robotic arm; The cross-shaped electric slide is installed on the top of the inner wall of the enclosure; The robotic arm is mounted on the moving end of the cross-shaped electric slide, and the vision camera is mounted on the moving end of the robotic arm; the cooperation between the cross-shaped electric slide and the robotic arm improves the convenience of moving and storing the vision camera.

[0014] Preferably, the verification system includes an image processing and analysis unit, a control unit, a display and alarm unit, and a data recording unit; Image processing and analysis unit: used to preprocess, extract features and calculate parameters of halo images acquired by vision camera, and determine whether the aperture and aperture position are qualified; The control unit is electrically connected to the ring light, the vision camera, and the image processing and analysis unit, respectively, and is used to control the timing actions of each unit component. Display and alarm unit: used to display the test results and issue an alarm when a defective product is detected; Data recording unit: used to record the original image, detection parameters, judgment result and timestamp for each detection; The image processing and analysis unit includes: Image preprocessing module: used to perform grayscale conversion, filtering and noise reduction, and binarization on the acquired halo image; Halo feature extraction module: used to extract the inner diameter, outer diameter, center position, edge roundness, and halo continuity feature parameters of the halo; Judgment module: Used to compare the extracted feature parameters with preset standard thresholds and output qualified or unqualified judgment results.

[0015] Preferably, the determination logic of the determination module includes: When the aperture is a complete circle, the inner ring is concentric with the detection column, and the width of the aperture is within the standard tolerance range, the hole diameter and hole position are deemed to be qualified. When the offset of the inner ring of the aperture exceeds the allowable hole position deviation, the hole position offset is deemed unqualified. When the aperture is incomplete or the area of ​​the aperture is less than 80% of the standard threshold, it is determined that the aperture is too small and therefore unqualified. When the width of the halo exceeds the standard, the aperture is deemed too large and unqualified. When the edge of the halo is jagged or has breaks, the aperture shape is deemed unqualified. When the grayscale distribution of the aperture ring is uneven and the grayscale gradient variance exceeds the standard, the hole wall quality is deemed unqualified. Compared with the prior art, the beneficial effects of the present invention are as follows: through the detailed analysis of the halo morphology, multiple defect types such as excessively large aperture, excessively small aperture, aperture position offset, non-circular aperture shape, and poor aperture wall quality can be detected simultaneously, realizing comprehensive quality verification, eliminating the subjective differences of manual inspection, and ensuring the consistency and repeatability of the test results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the isometric structure of the present invention; Figure 2 This is a partial isometric structural diagram showing the connection between the base and the electric conveyor belt, etc. Figure 3 This is a partial isometric structural diagram of the connection between the sleeve and the support plate, etc. Figure 4 This is a partial isometric structural diagram showing the connection between the bracket and the first electric cylinder, etc. Figure 5This is a partial isometric structural diagram showing the connection between the second lifting platform and the third electric cylinder, etc. Figure 6 This is a partial isometric structural diagram showing the connection between the brush bristles and the support plate, etc. Figure 7 This is a partial isometric structural diagram of the connection between the vision camera and the robotic arm, etc. Figure 8 This is a partial isometric structural diagram of the connection between the cover and the curtain, etc. Figure 9 This is a schematic diagram of the structure of the verification system of this invention; Figure 10 This is a schematic diagram of the image processing and analysis unit.

[0017] In the attached diagram, the following components are labeled: 101, base; 102, electric conveyor belt; 103, cover; 104, magnetic support platform; 105, detection hole; 106, vision camera; 107, detection column; 108, ring light; 201, bracket; 202, first lifting platform; 203, first electric cylinder; 204, brush bristles; 205, support plate; 206, first spring; 207, vibration motor; 301, telescopic rod; 302. Second electric cylinder; 303, pallet; 304, sleeve; 305, second spring; 401, guide frame; 402, rack; 403, conveyor table; 404, second lifting platform; 405, suction cup; 406, third electric cylinder; 407, drive motor; 501, purging pipe; 601, moving seat; 602, fourth electric cylinder; 603, guide roller; 701, curtain; 801, cross electric slide table; 802, robotic arm. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0019] Example 1

[0020] like Figures 1 to 8 As shown, based on Embodiment 1, this embodiment provides a metal sheet laser drilling verification fixture, which includes a base 101, an electric conveyor belt 102, a cover 103, a moving device, a cleaning device, a conveying device, a lifting device, a magnetic support platform 104, a detection hole 105, a vision camera 106, a detection column 107, and a ring light 108. The electric conveyor belt 102 and the cover 103 are respectively installed on the base 101. The electric conveyor belt 102 is used to transport the metal sheet after drilling from the upstream station to the cleaning device and the magnetic support table 104. The cover 103 is placed on the outside of the magnetic support table 104 and the vision camera 106 to provide a dark field environment and reduce the interference of external stray light on the acquisition of the halo image. A magnetic support platform 104 is disposed inside the cover 103. A limiting groove is provided at the top of the magnetic support platform 104. The outline of the limiting groove is adapted to the outline of the metal sheet. The bottom surface of the limiting groove is a magnetic attraction surface, which is used to limit the metal sheet in the horizontal direction and fix it in the vertical direction, so that the metal sheet remains stable in position during the detection process. Multiple sets of detection holes 105 are set at the bottom surface of the limiting groove. The detection holes 105 penetrate the upper and lower ends of the magnetic support platform 104. The diameter of the detection holes 105 is the same as the drilling diameter of the standard metal sheet. The position of the detection holes 105 corresponds one-to-one with the drilling position of the standard metal sheet. The detection holes 105 are used for the detection column 107 to pass through and provide a backlight channel. The vision camera 106 is installed inside the housing 103 via a moving device. The moving device is used to move the vision camera 106 in the horizontal and vertical planes. The vision camera 106 is connected to the verification system, which is used to verify the drilling quality on the metal sheet. The cleaning device is mounted on the base 101 and located above the electric conveyor belt 102. The cleaning device is used to clean the holes in the metal sheet to remove metal debris or dust adhering to the hole walls. A conveying device is mounted on the base 101. The conveying device is used to pick up the metal sheet on the electric conveyor belt 102 and transport it to the limiting groove of the magnetic support platform 104. Multiple sets of detection columns 107 and multiple sets of ring lights 108 are respectively mounted on the lifting device. The lifting device is used to drive the detection columns 107 and ring lights 108 to move up and down synchronously. The detection columns 107 are located below the magnetic support platform 104, and the ring lights 108 are arranged around the detection columns 107 and located below the magnetic support platform 104. The positions of multiple sets of detection columns 107 correspond to the vertical axes of multiple sets of detection holes 105. The diameter of the detection column 107 is smaller than the diameter of the detection hole 105. The upper end of the detection column 107 can pass through the detection hole 105 and extend into the hole of the metal sheet under the drive of the lifting device. The diameter of the detection column 107 is smaller than the diameter of the hole of the metal sheet, thereby forming an annular gap between the outer wall of the detection column 107 and the inner wall of the hole of the metal sheet. The light emitted by the ring lamp 108 forms a halo above the metal sheet after passing through the detection hole 105 and the annular gap. The conveying device includes a guide frame 401, a rack 402, a conveying table 403, a second lifting table 404, a suction cup 405, a third electric cylinder 406, and a drive motor 407; The guide frame 401 is mounted on the outer wall of the base 101 and passes through the interior of the cover 103. The guide frame 401 extends horizontally to provide guidance for the horizontal sliding of the conveyor table 403. The rack 402 is disposed on the outer wall of the guide frame 401 and extends along the length of the guide frame 401. The conveyor table 403 is horizontally slidably mounted on the guide frame 401. The conveyor table 403 can reciprocate between the electric conveyor belt 102 and the magnetic support table 104 along the guide frame 401. The second lifting platform 404 is slidably mounted on the conveyor platform 403. The second lifting platform 404 can be raised and lowered in the vertical direction relative to the conveyor platform 403. The suction cup 405 is mounted on the bottom of the second lifting platform 404. The suction cup 405 is connected to an external suction device through a pipeline and is used to pick up metal sheets under negative pressure. The fixed end of the third electric cylinder 406 is installed on the outer side wall of the conveyor table 403, and the moving end of the third electric cylinder 406 is connected to the second lifting platform 404 to drive the second lifting platform 404 to rise and fall relative to the conveyor table 403. The drive motor 407 is mounted on the outer side wall of the conveyor table 403. The output end of the drive motor 407 is connected to a gear, which meshes with the rack 402. The drive motor 407 is used to drive the conveyor table 403 to move horizontally along the guide frame 401. As an alternative, the meshing transmission between the drive motor 407 and the rack 402 can be replaced by a synchronous belt drive or a ball screw drive, the suction cup 405 can be replaced by an electromagnet, and the external suction device is a vacuum generator or a vacuum pump.

[0021] In this embodiment, the working process of the conveying device is as follows: the drive motor 407 drives the gear to rotate, the gear meshes with the rack 402 to drive the conveyor table 403 to slide horizontally along the guide frame 401 to above the electric conveyor belt 102, the third electric cylinder 406 drives the second lifting platform 404 to move downward, so that the suction cup 405 approaches the metal sheet on the electric conveyor belt 102, the external suction device is activated to generate negative pressure in the suction cup 405 to hold the metal sheet, the third electric cylinder 406 drives the second lifting platform 404 to move upward so that the metal sheet leaves the electric conveyor belt 102, the drive motor 407 drives the conveyor table 403 to move along the guide frame 401 to above the magnetic support platform 104 in the opposite direction, the third electric cylinder 406 drives the second lifting platform 404 to move downward, the suction cup 405 releases negative pressure and places the metal sheet in the limiting groove, thereby realizing the automatic picking and placing of the metal sheet.

[0022] In this embodiment, through the coordinated operation of the guide frame 401, rack 402, conveying table 403, second lifting table 404, suction cup 405, third electric cylinder 406 and drive motor 407 of the conveying device, the automated transfer of the metal sheet from the electric conveyor belt 102 to the magnetic support table 104 is realized. The entire process does not require manual intervention, which greatly improves the detection efficiency. At the same time, the suction cup 405 picks up the metal sheet in a way that avoids scratches on the surface of the metal sheet caused by mechanical clamping, thus ensuring the appearance quality of the metal sheet.

[0023] like Figures 1 to 8 As shown, based on Embodiment 1, the lifting device includes a telescopic rod 301, a second electric cylinder 302, a support plate 303, a sleeve 304, and a second spring 305. The telescopic rod 301 and the second electric cylinder 302 are both mounted on the inner wall of the base 101. The telescopic rod 301 is a multi-stage telescopic sleeve structure, used to provide vertical guidance for the lifting and lowering movement of the support plate 303. The second electric cylinder 302 serves as an active drive source to drive the lifting and lowering of the support plate 303. The support plate 303 is mounted on the telescopic rod. On the moving end of the second electric cylinder 302, the support plate 303 is horizontally positioned below the magnetic support platform 104. The support plate 303 can move up and down in the vertical direction as the second electric cylinder 302 extends and retracts. The bottom ends of multiple sets of sleeves 304 are fixedly connected to the top ends of the support plate 303. The sleeves 304 are hollow cylinders with open top ends. The lower parts of multiple sets of detection columns 107 are slidably installed in the multiple sets of sleeves 304. The detection columns 107 can slide axially within the sleeves 304. Multiple sets of second springs 305 are respectively installed inside multiple sets of sleeves 304. The bottom end of the second spring 305 abuts against the inner bottom wall of the sleeve 304 and the top end abuts against the bottom end of the detection column 107. It is used to apply an upward elastic support force to the detection column 107 so that the detection column 107 maintains an upward extension tendency when it is not subjected to external force. Multiple sets of ring lights 108 are respectively mounted on the top of the support plate 303 around multiple sets of sleeves 304. The ring lights 108 are LED ring light sources with their light-emitting surfaces facing upwards, and are used to provide uniform backlight illumination from the bottom of the detection hole 105. As an alternative, the second electric cylinder 302 can be replaced by a hydraulic cylinder or a linear motor, and the ring light 108 can be replaced by fiber optic lighting or laser lighting.

[0024] In this embodiment, the lifting device operates as follows: After the conveying device places the metal sheet into the limiting groove of the magnetic support platform 104, the second electric cylinder 302 starts and drives the support plate 303 to move upward. The support plate 303 drives the sleeve 304, the second spring 305, the detection column 107, and the ring light 108 to rise synchronously. The upper end of the detection column 107 passes through the detection hole 105 and continues to rise and extend into the corresponding hole of the metal sheet. If the hole position of the metal sheet is consistent with the standard position, the detection column 107 is coaxial with the hole of the metal sheet. The detection column 107 remains extended under the elastic support of the second spring 305. The outer wall of the detection column 107 is parallel to the inner wall of the hole of the metal sheet. A uniform annular gap is formed between the metal sheet and the metal sheet. If the hole position of the metal sheet is too large, causing interference between the detection column 107 and the hole wall of the metal sheet, the upper end of the detection column 107 will be subjected to the downward pressure of the hole wall. The detection column 107 will overcome the elastic force of the second spring 305 and slide downward to retract into the sleeve 304, thereby avoiding the detection column 107 from being broken or damaged due to rigid collision. The second electric cylinder 302 continues to drive the support plate 303 to rise to the preset detection position and then stops. At this time, the ring light 108 is located at a suitable distance below the magnetic support platform 104. The ring light 108 is turned on and shines light upward from the bottom. After the light passes through the detection hole 105 and the annular gap, it forms a halo above the metal sheet.

[0025] In this embodiment, the smooth lifting and lowering of the pallet 303 is achieved through the cooperation of the telescopic rod 301 and the second electric cylinder 302. The elastic sliding support of the detection column 107 by the sleeve 304 and the second spring 305 enables the detection column 107 to adaptively retract when it interferes with the hole of the metal sheet, avoiding damage to the detection column 107 and the metal sheet caused by hard collisions, and improving the operational safety and reliability of the device.

[0026] like Figures 1 to 8As shown, based on Embodiment 1, the cleaning device includes a bracket 201, a first lifting platform 202, a first electric cylinder 203, brush bristles 204, a support plate 205, a first spring 206, and a vibration motor 207. The bracket 201 is located at the top of the base 101 and above the electric conveyor belt 102. The bracket 201 has a portal frame structure and is used to support the first lifting platform 202 and its auxiliary components. The first lifting platform 202 is slidably mounted on the bracket 201 and can rise and fall vertically along the vertical guide rod of the bracket 201. The fixed end of the first electric cylinder 203 is mounted on the top of the bracket 201. The moving end of an electric cylinder 203 passes through the top of the bracket 201 and is connected to the first lifting platform 202 to drive the first lifting platform 202 to rise and fall; bristles 204 are disposed at the bottom of the support plate 205, and the bristles 204 are multiple bundles of nylon bristles or metal bristles. The distribution area of ​​the bristles 204 covers all the holes on the metal sheet, and the ends of the bristles 204 are lower than the height of the holes on the metal sheet in the free state; the top of the support plate 205 is installed at the bottom of the first lifting platform 202 through multiple sets of first springs 206. The first springs 206 provide elastic suspension support for the support plate 205, so that the bristles 204 have a certain pressure buffer when they come into contact with the metal sheet; The vibration motor 207 is installed on the outer wall of the first lifting platform 202. When the eccentric oscillator of the vibration motor 207 rotates, it generates high-frequency vibration. This vibration is transmitted to the support plate 205 and the brush bristles 204 through the first lifting platform 202 and the first spring 206. As an alternative, the first electric cylinder 203 can be replaced by a pneumatic or hydraulic cylinder, the brush bristles 204 can be replaced by a sponge brush head or a rubber scraper, and the vibration motor 207 can be replaced by an ultrasonic transducer to achieve high-frequency micro-vibration. The sliding contact surface between the vertical guide rod of the support 201 and the first lifting platform 202 may experience wear and tear after long-term use, leading to a decrease in lifting accuracy. Preferably, a linear bearing is provided between the vertical guide rod of the support 201 and the first lifting platform 202 to reduce sliding friction and improve the guiding accuracy of the lifting motion. Long-term high-frequency vibration of the vibration motor 207 may cause the connection between the first lifting platform 202 and the support 201 to loosen. Preferably, a rubber shock-absorbing pad is provided at the top of the support 201, located between the fixed end of the first electric cylinder 203 and the support 201, to reduce the transmission of high-frequency vibration to the support 201 and the base 101.

[0027] In this embodiment, the cleaning device operates as follows: When the electric conveyor belt 102 transports the metal sheet to below the support 201 and directly below the brush bristles 204, the electric conveyor belt 102 stops operating, the first electric cylinder 203 starts and drives the first lifting platform 202 to move downwards, and the first lifting platform 202 drives the support plate 205 and the brush bristles 204 to move downwards synchronously; the ends of the brush bristles 204 first contact the upper surface of the metal sheet, and as the first lifting platform 202 continues to move downwards, the brush bristles 204 bend and deform, and the ends of the brush bristles 204 corresponding to the positions of the holes on the metal sheet extend into the corresponding holes after bending. Furthermore, the sidewalls of the brush bristles 204 are in close contact with the inner wall of the hole; then the vibration motor 207 starts, and the high-frequency vibration generated by it is transmitted to the support plate 205 and the brush bristles 204 through the first lifting platform 202 and the first spring 206. Under the action of vibration, the brush bristles 204 reciprocate to brush the inner wall of the hole, shaking off the metal debris and dust attached to the inner wall of the hole and carrying them out of the hole; after cleaning is completed, the vibration motor 207 stops, the first electric cylinder 203 drives the first lifting platform 202 to move upward and reset, the brush bristles 204 disengage from the hole of the metal sheet and leave the upper surface of the metal sheet, and the electric conveyor belt 102 restarts to transport the cleaned metal sheet to the next station.

[0028] In this embodiment, the brush bristles 204 and the vibration motor 207 work together to achieve efficient cleaning of the inner wall of the hole in the metal sheet, effectively removing the metal debris and dust remaining after laser drilling, avoiding interference of debris in the hole with the halo shape in subsequent optical inspection, and improving the accuracy and reliability of the inspection results. At the same time, the buffering effect of the first spring 206 avoids rigid impact between the brush bristles 204 and the metal sheet, reducing scratches on the surface of the metal sheet.

[0029] like Figures 1 to 8 As shown, based on Embodiment 1, this embodiment further includes a purge pipe 501; the purge pipe 501 is mounted on the bracket 201 and located on one side of the brush bristles 204. Multiple sets of nozzles are connected to the outer wall of the purge pipe 501, with the nozzles spraying towards the perforated area of ​​the metal sheet. The input end of the purge pipe 501 is connected to an external air supply device via a pipe. The external air supply device is a compressed air source or a blower, used to supply compressed air into the purge pipe 501. The compressed air is ejected at high speed through the nozzles and acts on the perforations of the metal sheet, blowing away the loosened debris and dust from the perforations and the surface of the metal sheet after being brushed by the brush bristles 204. Alternatively, the external air supply device can be a nitrogen source, used to provide inert gas protection to the metal sheet during the purge process, preventing oxidation of the metal sheet during cleaning. A universal joint can be installed at the connection between the purge pipe 501 and the bracket 201 to adjust the spray angle of the nozzles to adapt to the cleaning needs of metal sheets of different thicknesses and perforations.

[0030] In this embodiment, the working process of the blowing pipe 501 is as follows: while the vibration motor 207 is started to clean the inner wall of the hole by brushing the bristles 204, or after brushing is completed, the external air supply device is started and compressed air is delivered into the blowing pipe 501. The compressed air is sprayed out at high speed through multiple sets of nozzles and blown towards the hole area of ​​the metal sheet. The high-speed airflow blows away the debris and dust loosened by the brush bristles 204 from the hole and the surface of the metal sheet, so as to achieve a combined cleaning effect of brushing and blowing.

[0031] In this embodiment, by setting up the purging pipe 501 and the nozzle, an airflow purging function is added on the basis of mechanical brushing of the bristles 204. The mechanical brushing and airflow purging work together to significantly improve the thoroughness of cleaning inside the hole. At the same time, the high-speed airflow can blow away the debris adhering to the bristles 204, maintain the cleanliness of the bristles 204, and extend the effective service life of the bristles 204.

[0032] like Figures 1 to 8 As shown, based on Embodiment 1, this embodiment further includes a movable seat 601, a fourth electric cylinder 602, and a guide roller 603; multiple sets of movable seats 601 are slidably mounted on the bracket 201, with the movable seats 601 located on both sides of the width direction of the electric conveyor belt 102, and the movable seats 601 can slide opposite each other along the transverse slide rail of the bracket 201 relative to the width direction of the electric conveyor belt 102; multiple sets of guide rollers 603 are rotatably mounted on multiple sets of movable seats 601, with the axis of the guide rollers 603 set vertically, and the circumferential surface of the guide rollers 603 used for rolling contact with the side of the metal sheet to guide and limit the conveying direction of the metal sheet; multiple sets of fourth electric cylinders 602 are respectively mounted on the outer side wall of the bracket 201, and the moving ends of the multiple sets of fourth electric cylinders 602 are respectively connected to the multiple sets of movable seats 601, used to drive the movable seats 601 to slide along the transverse slide rail to adjust the distance between the guide rollers 603 on both sides; As an alternative, the fourth electric cylinder 602 can be replaced by a manual screw adjustment mechanism, and the guide roller 603 can be replaced by a fixed guide block; the sliding mating surface between the transverse slide rail and the moving seat 601 may develop gaps due to wear during long-term use. Preferably, the cross section of the transverse slide rail is V-shaped or dovetail-shaped to improve the sliding guidance accuracy and load-bearing stability of the moving seat 601.

[0033] In this embodiment, the working process of the guide roller 603 is as follows: Before the electric conveyor belt 102 conveys the metal sheet, according to the width of the metal sheet, the fourth electric cylinder 602 drives the moving seat 601 to slide along the transverse slide rail, adjusting the distance between the two guide rollers 603 so that the distance between the two guide rollers 603 is slightly larger than the width of the metal sheet; when the electric conveyor belt 102 drives the metal sheet forward, the two sides of the metal sheet roll into contact with the circumferential surface of the two guide rollers 603 respectively, and the guide rollers 603 passively rotate with the movement of the metal sheet, applying a limiting constraint along the width direction to the metal sheet, so that the metal sheet remains in the center position during the conveying process.

[0034] In this embodiment, the fourth electric cylinder 602 drives the moving seat 601 to move the guide roller 603 in opposite directions, thereby achieving the centering guidance of metal sheets of different widths and improving the consistency of the conveying position of the metal sheets on the electric conveyor belt 102. This ensures the alignment accuracy between the suction cup 405 and the metal sheet when the conveying device picks up the metal sheet. At the same time, the rolling contact method of the guide roller 603 reduces frictional resistance and avoids scratches on the side of the metal sheet.

[0035] like Figures 1 to 8 As shown, based on Embodiment 1, this embodiment further includes a curtain 701; the curtain 701 is installed on both sides of the cover 103, and the curtain 701 is a flexible light-blocking curtain. The upper end of the curtain 701 is connected to the top or side wall of the cover 103, and the lower end hangs freely. The curtain 701 is used to block the opening areas on both sides of the cover 103 to reduce the amount of external ambient light entering the interior of the cover 103; as an alternative, the curtain 701 can be replaced by a rigid light-blocking plate, which is installed on the side wall of the cover 103 by a hinge and can be flipped up and opened, or a roller shutter structure can be used instead; a gap is maintained between the lower end of the curtain 701 and the upper surface of the electric conveyor belt 102 to allow the metal sheet to pass through; a counterweight strip can be provided at the lower end of the curtain 701 to keep the curtain 701 in a natural hanging state and reduce the swaying caused by airflow disturbance.

[0036] In this embodiment, the curtain 701 creates a relatively enclosed dark environment inside the enclosure 103. The light emitted by the ring lamp 108, after passing through the ring gap, forms a halo that can be clearly captured by the vision camera 106. This reduces the interference of external ambient light on the halo image and improves the signal-to-noise ratio and detection accuracy of the image. At the same time, the flexible material of the curtain 701 ensures that the metal sheet is not rigidly blocked when entering and exiting the enclosure 103, thus guaranteeing smooth transport.

[0037] like Figures 1 to 8As shown, based on Embodiment 1, the moving device includes a cross-shaped electric slide table 801 and a robotic arm 802. The cross-shaped electric slide table 801 is installed on the top of the inner wall of the cover 103. The cross-shaped electric slide table 801 consists of two sets of orthogonally arranged linear slide table modules, which are used to drive the robotic arm 802 to move in the X-axis and Y-axis directions in the horizontal plane. The robotic arm 802 is installed on the moving end of the cross-shaped electric slide table 801. The robotic arm 802 is a multi-joint articulated robotic arm. The vision camera 106 is installed on the moving end of the robotic arm 802. The robotic arm 802 is used to drive the vision camera 106 to swing and rise and fall in the vertical plane to adjust the pitch angle and object distance of the vision camera 106. As an alternative, the cross slide table 801 can be replaced by a synchronous belt linear module or a linear motor module, and the robotic arm 802 can be replaced by a SCARA robotic arm or a six-axis robotic arm; the vision camera 106 is a high-resolution industrial CCD camera, and a polarizer can be set at the front end of its lens to reduce the interference of reflections on the metal sheet surface on the acquisition of the halo image; the sliding guide rail of the linear slide module of the cross slide table 801 is exposed inside the cover 103, and after long-term use, the sliding accuracy may decrease due to dust accumulation. Preferably, an accordion-style dust cover is provided on the outside of the sliding guide rail of the linear slide module of the cross slide table 801 to prevent dust from accumulating on the guide rail surface; the connecting cable between the vision camera 106 and the robotic arm 802 may become entangled or break due to fatigue during the movement of the robotic arm 802. Preferably, a drag chain is sleeved on the outside of the connecting cable, one end of which is connected to the fixed end of the robotic arm 802 and the other end is connected to the moving end of the robotic arm 802 to constrain and protect the connecting cable.

[0038] In this embodiment, the working process of the moving device is as follows: When the metal sheet is placed in the limiting groove of the magnetic support platform 104 and the detection column 107 rises to the position, the cross-shaped electric slide 801 drives the robotic arm 802 to move in the horizontal plane according to the preset detection path, so that the vision camera 106 moves sequentially to the position directly above each detection hole 105. At the same time, the robotic arm 802 drives the vision camera 106 to swing and rise and fall in the vertical plane to adjust the pitch angle and object distance of the vision camera 106, so that the optical axis of the vision camera 106 coincides with the axis of the detected hole and the focal length is clear. After moving to each detection position, the vision camera 106 acquires an image of the halo below and transmits the acquired halo image to the verification system. After the acquisition is completed, the cross-shaped electric slide 801 drives the vision camera 106 to move to the next detection position until all holes are detected.

[0039] In this embodiment, through the coordinated operation of the cross-shaped electric slide 801 and the robotic arm 802, the vision camera 106 can move flexibly inside the housing 103 to acquire images of the halo at different positions from multiple angles and at multiple heights. The cross-shaped electric slide 801 ensures high precision and high repeatability of positioning in the horizontal plane, while the robotic arm 802 provides degrees of freedom for pitch and elevation, enabling the vision camera 106 to image the halo in the best posture, thus improving the flexibility and adaptability of image acquisition.

[0040] like Figure 9 and Figure 10 As shown, based on Embodiment 1, the verification system includes an image processing and analysis unit, a control unit, a display and alarm unit, and a data recording unit. The image processing and analysis unit is used to preprocess, extract features, and calculate parameters of the halo image acquired by the vision camera 106, and to determine whether the aperture and aperture position are qualified. The control unit is electrically connected to the ring light 108, the vision camera 106, and the image processing and analysis unit, respectively, and is used to control the timing of each unit component, including the switching timing of the ring light 108, the trigger acquisition timing of the vision camera 106, the movement timing of the cross electric slide 801 and the robotic arm 802, and the coordinated action timing of the lifting device and the conveying device. The control unit is a PLC controller or an industrial computer. The display and alarm unit is used to display the detection results and issue an audible and visual alarm when a defective product is detected; the data recording unit is used to record the original image, detection parameters, judgment results and timestamps for each detection; the image processing and analysis unit includes an image preprocessing module, a halo feature extraction module and a judgment module; the image preprocessing module is used to perform grayscale, filtering and denoising and binarization processing on the acquired halo image, wherein the filtering and denoising uses median filtering or Gaussian filtering algorithms to eliminate random noise during the image acquisition process; The halo feature extraction module is used to extract the inner diameter, outer diameter, center position, edge roundness, and halo continuity feature parameters of the halo. The inner diameter is the diameter of the inner ring boundary, the outer diameter is the diameter of the outer ring boundary, the center position is the coordinate of the center of the inner or outer ring boundary, the edge roundness is the fitting degree between the halo boundary and the ideal circle, and the halo continuity is the continuous proportion of effective pixels on the halo boundary. The judgment module is used to compare the extracted feature parameters with the preset standard threshold and output the qualified or unqualified judgment result according to the comparison result. As an alternative, the image preprocessing module can use an FPGA hardware acceleration module to replace the software algorithm to improve the real-time performance of image processing, and the halo feature extraction module can use a deep learning-based image segmentation algorithm to replace the traditional edge detection algorithm to improve the robustness of feature extraction. When the connecting cables between the control unit and various electrical components are arranged inside the enclosure 103, there may be a risk of electromagnetic interference. Preferably, the signal cable between the control unit and the vision camera 106 is a shielded cable, and the shielding layer is grounded at one end on the control unit side to reduce the impact of electromagnetic interference on image signal transmission. The PLC controller or industrial computer of the control unit is equipped with a waterproof and dustproof control cabinet. The cabinet door is equipped with a sealing strip, and the bottom of the cabinet is equipped with a cooling fan and a dust filter to ensure the waterproof, dustproof and heat dissipation performance of the control unit in the industrial environment.

[0041] The judgment logic of the judgment module includes: when the halo is a complete circle, the inner ring is concentric with the detection column 107, and the width of the halo is within the standard tolerance range, the aperture and hole position are deemed qualified; when the offset of the inner ring of the halo exceeds the allowable hole position deviation, the hole position offset is deemed unqualified; when the halo is incomplete or the area of ​​the halo is less than 80% of the standard threshold, the aperture is deemed unqualified because it is too small; when the width of the halo exceeds the standard uniformity, i.e., the width of the halo is greater than the standard upper limit, the aperture is deemed unqualified because it is too large; when the edge of the halo is serrated or there are breaks, the hole shape is deemed unqualified; when the gray distribution of the halo is uneven and the gray gradient variance exceeds the standard, the hole wall quality is deemed unqualified. The standard thresholds and allowable deviations in this judgment logic are preset in the judgment module according to the specific drilling process requirements of the metal sheet, and can be adjusted through the human-machine interface of the control unit.

[0042] In this embodiment, the control unit of the verification system achieves fully automated control of the entire process, from metal sheet positioning, detection column insertion, ring light illumination, vision camera movement and image acquisition to image processing and analysis, by controlling the timing actions of each unit component. The image processing and analysis unit achieves simultaneous detection of various defect types, such as aperture, hole position, roundness, and hole wall quality, through multi-dimensional feature extraction and quantitative analysis of the ring image. The display and alarm unit and the data recording unit respectively realize the visualization of the detection results and the traceable storage of historical data, meeting the needs of industrial site quality management.

[0043] The overall working process of the metal sheet laser drilling verification fixture of the present invention is as follows: After drilling, the metal sheet is placed on the electric conveyor belt 102. The electric conveyor belt 102 is started and the metal sheet is transported towards the cleaning device. During the transport process, the two sides of the metal sheet roll into contact with the guide rollers 603 on both sides. The guide rollers 603 guide and limit the transport direction of the metal sheet, keeping the metal sheet in a centered position. When the metal sheet is transported to below the bristles 204, the electric conveyor belt 102 stops running. The first electric cylinder 203 drives the first lifting platform 202 to move downward so that the bristles 204 contact the upper surface of the metal sheet and the ends of the bristles 204 extend into the holes of the metal sheet. The vibration motor 207 is started to make the bristles 204 vibrate at high frequency. The inner wall of the hole is brushed and cleaned. Simultaneously, an external air supply device delivers compressed air to the purging pipe 501, which is then sprayed at high speed through the nozzle, blowing away the loosened debris and dust from inside the hole and onto the metal sheet surface. After cleaning, the vibration motor 207 and the external air supply device stop. The first electric cylinder 203 drives the first lifting platform 202 to move upwards and reset. The electric conveyor belt 102 restarts, transporting the cleaned metal sheet to the vicinity of the magnetic support platform 104. The drive motor 407 drives the conveyor platform 403 to move along the guide frame 401 above the electric conveyor belt 102. The third electric cylinder 406 drives the second lifting platform 404 downwards, causing the suction cup 405 to contact the upper surface of the metal sheet. The external suction device is activated, creating negative pressure in the suction cup 405 to suck up the metal sheet. The third electric cylinder 406 drives the second lifting platform 404 to rise, causing the metal sheet to leave the electric conveyor belt 102. The drive motor 407 drives the conveyor platform 403 to move above the magnetic support platform 104. The third electric cylinder 406 drives the second lifting platform 404 to descend, causing the metal sheet to enter the limiting groove. The suction cup 405 releases negative pressure to place the metal sheet in the limiting groove. The magnetic attraction of the magnetic support platform 104 attracts and fixes the metal sheet in the limiting groove. The second electric cylinder 302 drives the support plate 303 to move upward. The support plate 303 drives the sleeve 304, the detection column 107 and the ring light 108 to rise synchronously. The upper end of the detection column 107 passes through the detection hole 105 and extends into the corresponding hole of the metal sheet. For metal sheets with standard hole positions, the detection column 107... 7 is located at the center of the hole, and an annular gap is formed between the outer wall of the detection post 107 and the inner wall of the hole. For metal pieces with offset hole positions, the detection post 107 interferes with the hole wall and slides down to avoid breakage by overcoming the elastic force of the second spring 305. The second electric cylinder 302 drives the support plate 303 to rise to the preset detection position and then stops. The ring light 108 is turned on and shines light from the bottom. After the light passes through the detection hole 105 and the annular gap, it forms a halo above the metal piece. The cross electric slide 801 drives the robotic arm 802 to move horizontally. The robotic arm 802 drives the vision camera 106 to move to the top of each detection hole 105 in sequence and adjusts the pitch angle and object distance. The vision camera 106 collects each halo one by one and transmits the image to the verification system.The image preprocessing module of the verification system performs grayscale conversion, filtering and denoising, and binarization on the halo image. The halo feature extraction module extracts the inner diameter, outer diameter, center position, edge roundness, and halo continuity feature parameters of the halo. The judgment module compares the extracted feature parameters with preset standard thresholds and outputs a qualified or unqualified judgment result according to the judgment logic. The display and alarm unit displays the detection results. If a non-qualified product is detected, an audible and visual alarm is issued. The data recording unit records the original image, detection parameters, judgment result, and timestamp of this detection. After all hole positions are detected, the ring light 108 is turned off, and the second electric cylinder 302 drives the support plate 303 to move downwards and reset the detection column. 107 exits the hole and detection hole 105 of the metal sheet. Drive motor 407 drives conveyor 403 to move above magnetic support platform 104. Third electric cylinder 406 drives second lifting platform 404 to descend, causing suction cup 405 to contact the upper surface of the metal sheet. External suction equipment activates to hold the inspected metal sheet. Second electric cylinder 302 drives pallet 303 to continue moving downwards to reset. Third electric cylinder 406 drives second lifting platform 404 to rise, causing the metal sheet to leave magnetic support platform 104. Drive motor 407 drives conveyor 403 to move above the downstream station. Suction cup 405 releases negative pressure, placing the metal sheet on the downstream conveyor belt. This completes one inspection cycle.

[0044] The image preprocessing algorithm, halo feature extraction algorithm, and judgment logic involved in the above verification system are all existing image processing technologies known to those skilled in the art. Those skilled in the art can implement them simply by programming and setting parameters according to their known algorithm principles, without requiring any creative effort from those skilled in the art. The electric conveyor belt 102, vision camera 106, ring light 108, first electric cylinder 203, vibration motor 207, second electric cylinder 302, third electric cylinder 406, drive motor 407, fourth electric cylinder 602, cross electric slide 801, and robotic arm 802 are all standardized components purchased from the market. Those skilled in the art can install and operate them simply by following the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to the above embodiments without departing from the principles and spirit of the present invention. For example, the material of the detection column 107 can be stainless steel or ceramic depending on the material of the metal sheet; the light source color of the ring lamp 108 can be red, blue, or white depending on the different reflective characteristics of the metal sheet surface; and the number and arrangement of the detection holes 105 can be adaptively adjusted according to the different perforation patterns on the metal sheet. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal sheet laser drilling verification fixture, comprising a base (101), an electric conveyor belt (102), and a cover (103). The electric conveyor belt (102) and the cover (103) are respectively mounted on the base (101); characterized in that, It also includes a moving device, a cleaning device, a conveying device, a lifting device, a magnetic support platform (104), a detection hole (105), a vision camera (106), a detection column (107), and a ring light (108). A magnetic support platform (104) is set inside the cover (103), and a limiting groove is provided at the top of the magnetic support platform (104); Multiple sets of detection holes (105) are set at the limiting groove, and the diameter of the detection holes (105) is the same as the diameter of the hole in the metal sheet, and the position of the detection holes (105) corresponds to the position of the hole in the metal sheet. The visual camera (106) is installed inside the housing (103) via a moving device. The moving device is used to move the visual camera (106) to a different position. The visual camera (106) is connected to the verification system, which is used to verify the quality of the perforation on the metal sheet. The cleaning device is mounted on the base (101) and is used to clean the holes in the metal sheet. A conveying device is mounted on the base (101) and is used to transport metal sheets; Multiple sets of detection columns (107) and multiple sets of ring lights (108) are respectively installed on the lifting device, which is used to drive the detection columns (107) and ring lights (108) to move up and down; The positions of the multiple sets of detection columns (107) correspond to the position axes of the multiple sets of detection holes (105), and the diameter of the detection column (107) is smaller than the diameter of the detection hole (105).

2. The metal sheet laser drilling verification fixture as described in claim 1, characterized in that, The cleaning device includes a bracket (201), a first lifting platform (202), a first electric cylinder (203), bristles (204), a support plate (205), a first spring (206), and a vibration motor (207). The bracket (201) is set on top of the base (101); The first lifting platform (202) is slidably mounted on the bracket (201); The fixed end of the first electric cylinder (203) is mounted on the bracket (201), and the moving end of the first electric cylinder (203) is connected to the first lifting platform (202); The bristles (204) are set at the bottom of the support plate (205); The top of the support plate (205) is installed at the bottom of the first lifting platform (202) by multiple sets of first springs (206); The vibration motor (207) is installed on the outer wall of the first lifting platform (202).

3. The metal sheet laser drilling verification fixture as described in claim 1, characterized in that, The lifting device includes a telescopic rod (301), a second electric cylinder (302), a support plate (303), a sleeve (304), and a second spring (305); The telescopic rod (301) and the second electric cylinder (302) are both installed on the inner side wall of the base (101); The pallet (303) is installed on the moving end of the telescopic rod (301) and the second electric cylinder (302); The bottom ends of multiple sets of sleeves (304) are connected to the top end of the support plate (303), and the lower parts of multiple sets of detection columns (107) are slidably installed on the multiple sets of sleeves (304); Multiple sets of second springs (305) are respectively installed inside multiple sets of sleeves (304) and provide elastic support for multiple sets of detection columns (107); Multiple ring lights (108) are installed around multiple sleeves (304) on the top of the tray (303).

4. The metal sheet laser drilling verification fixture as described in claim 1, characterized in that, The conveying device includes a guide frame (401), a rack (402), a conveying table (403), a second lifting platform (404), a suction cup (405), a third electric cylinder (406), and a drive motor (407). The guide frame (401) is mounted on the outer wall of the base (101) and passes through the inside of the cover (103); The rack (402) is mounted on the outer wall of the guide frame (401); The conveyor table (403) is horizontally slidably mounted on the guide frame (401); The second lifting platform (404) is slidably mounted on the conveyor platform (403); The suction cup (405) is installed at the bottom of the second lifting platform (404) and is connected to the external suction device; The fixed end of the third electric cylinder (406) is installed on the outer wall of the conveyor table (403), and the moving end of the third electric cylinder (406) is connected to the second lifting table (404). The drive motor (407) is installed on the outer wall of the conveyor (403), and the output end of the drive motor (407) meshes with the rack (402) through a gear.

5. The metal sheet laser drilling verification fixture as described in claim 2, characterized in that, It also includes a purge line (501); the purge line (501) is installed on the outer wall of the bracket (201); Multiple nozzles are connected to the outer wall of the purging pipeline (501), and the inlet end of the purging pipeline (501) is connected to an external air supply device.

6. The metal sheet laser drilling verification fixture as described in claim 2, characterized in that, It also includes a movable seat (601), a fourth electric cylinder (602), and a guide roller (603); Multiple sets of movable seats (601) are slidably mounted on the bracket (201) in opposite directions; Multiple sets of guide rollers (603) are rotatably mounted on multiple sets of movable seats (601); Multiple sets of fourth electric cylinders (602) are respectively installed on the outer wall of the bracket (201), and the moving ends of the multiple sets of fourth electric cylinders (602) are respectively connected to multiple sets of moving seats (601).

7. The metal sheet laser drilling verification fixture as described in claim 1, characterized in that, It also includes curtains (701); The curtain (701) is installed on both sides of the cover (103).

8. The metal sheet laser drilling verification fixture as described in claim 1, characterized in that, The moving device includes a cross-shaped electric slide (801) and a robotic arm (802). The cross-shaped electric slide (801) is installed on the top of the inner wall of the enclosure (103); The robotic arm (802) is mounted on the moving end of the cross-shaped electric slide (801), and the vision camera (106) is mounted on the moving end of the robotic arm (802).

9. The metal sheet laser drilling verification fixture as described in claim 1, characterized in that, The verification system includes an image processing and analysis unit, a control unit, a display and alarm unit, and a data recording unit; Image processing and analysis unit: used to preprocess, extract features and calculate parameters of the halo image acquired by the vision camera (106), and determine whether the aperture and aperture position are qualified; The control unit is electrically connected to the ring light (108), the vision camera (106), and the image processing and analysis unit, respectively, and is used to control the timing actions of each unit component. Display and alarm unit: used to display the test results and issue an alarm when a defective product is detected; Data recording unit: used to record the original image, detection parameters, judgment result and timestamp for each detection; The image processing and analysis unit includes: Image preprocessing module: used to perform grayscale conversion, filtering and noise reduction, and binarization on the acquired halo image; Halo feature extraction module: used to extract the inner diameter, outer diameter, center position, edge roundness, and halo continuity feature parameters of the halo; Judgment module: Used to compare the extracted feature parameters with preset standard thresholds and output qualified or unqualified judgment results.

10. The metal sheet laser drilling verification fixture as described in claim 9, characterized in that, The determination logic of the determination module includes: When the aperture is a complete circle, the inner ring is concentric with the detection column (107), and the width of the aperture is within the standard tolerance range, the hole diameter and hole position are deemed to be qualified. When the offset of the inner ring of the aperture exceeds the allowable hole position deviation, the hole position offset is deemed unqualified. When the aperture is incomplete or the area of ​​the aperture is less than 80% of the standard threshold, it is determined that the aperture is too small and therefore unqualified. When the width of the halo exceeds the standard, the aperture is deemed too large and unqualified. When the edge of the halo is jagged or has breaks, the aperture shape is deemed unqualified. When the grayscale distribution of the halo is uneven and the grayscale gradient variance exceeds the standard, the hole wall quality is deemed unqualified.

Images