An aluminum material surface defect detection apparatus

Abstract

The application relates to the technical field of aluminum material processing quality detection, and provides an aluminum material surface defect detection equipment, which comprises a detection table and an illumination box; a first detection assembly and a placing base for fixing the aluminum material are arranged on the detection table; a touch probe capable of lifting relative to the placing base is arranged on the first detection assembly; the illumination box is arranged on the detection table; a second detection assembly is arranged at the top of the illumination box; a visual camera is arranged on the second detection assembly; illumination light sources are arranged on the inner side walls of the two sides of the bottom of the illumination box; the illumination directions of the illumination light sources are towards the placing base, and a light-shielding structure for adjusting the illumination uniformity is arranged in the illumination direction; and a light-reflecting film is attached to the inner wall surface of the illumination box; the application has compact structure, uniform illumination and no glare interference; through double detection of the contact type and the non-contact type, the detection rate and the detection stability of the aluminum material surface defects are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum processing quality inspection technology, and more specifically, to an aluminum surface defect detection device. Background Technology

[0002] Currently, aluminum is widely used in building decoration, transportation, aerospace, and electronic product casings due to its low density, high specific strength, corrosion resistance, and excellent processing performance. As downstream industries increasingly demand higher product appearance quality, the flatness, smoothness, and consistency of aluminum surfaces have become crucial indicators for evaluating their quality. However, during the rolling, shearing, heat treatment, and surface treatment processes of aluminum, various surface defects such as scratches, indentations, oxide spots, bubbles, roll marks, and oil stains are easily generated. In existing technologies, aluminum surface defect detection mainly relies on traditional optical inspection methods. Traditional optical inspection equipment often uses area array cameras or line array cameras with fixed light sources for imaging. However, when aluminum surfaces have reflections, curvature, or complex textures, uneven lighting, highlight overflow, or shadow obstruction often leads to insufficient image contrast, making it difficult to effectively identify small, shallow scratches and low-contrast defects. Summary of the Invention

[0003] In view of this, and in order to solve the problem, the present invention provides an aluminum surface defect detection device, the specific technical solution of which is as follows: An aluminum surface defect detection device includes a detection platform and a lighting box. The detection platform is provided with a first detection component and a placement base for fixing the aluminum material. The first detection component is provided with a touch probe that can be raised and lowered relative to the placement base. The lighting box is placed on the detection platform. The top of the lighting box is provided with a second detection component, which is provided with a vision camera. Lighting sources are installed on the inner sidewalls on both sides of the bottom of the lighting box. The illumination direction of the lighting sources is towards the placement base, and a light-shielding structure for adjusting the uniformity of illumination is provided in the illumination direction. A reflective film is attached to the inner wall surface of the lighting box.

[0004] The aforementioned aluminum surface defect detection equipment, by setting up a lighting box cover on the detection table and attaching a reflective film to the inner wall of the lighting box, and by setting up a light-shielding structure in the direction of the illumination source to adjust the uniformity of the illumination, can provide a uniform, soft and glare-free lighting environment for the aluminum surface. This effectively suppresses local overexposure and shadow interference caused by the high reflectivity of aluminum, thereby significantly improving the contrast and clarity of the images captured by the visual camera, enabling the accurate identification of shallow defects such as scratches, embossing, and oxide spots. In addition, by using a touch probe that can be raised and lowered relative to the base for contact detection, it realizes dual verification of non-contact optical detection and contact flaw detection, solving the problems of high missed detection rate and poor adaptability of existing technologies that rely on manual visual inspection or single optical inspection.

[0005] Furthermore, the testing platform is provided with a transverse guide rail, and the placement base is slidably mounted on the transverse guide rail.

[0006] Furthermore, a transmission plate is connected to the bottom of the placement base, and a drive cylinder is installed inside the detection platform. The output end of the drive cylinder extends to be connected to the transmission plate and is used to control the sliding state of the placement base on the transverse guide rail.

[0007] Furthermore, the top of the placement base is provided with a placement groove, and a support plate is installed in the placement groove. The support plate and each groove wall of the placement groove cooperate to form a fixed space that is compatible with the aluminum material.

[0008] Furthermore, the first detection component includes a first bracket, a lifting seat, and a first mounting component. The first bracket is fixed on the detection table, and a lifting guide rail is provided on the first bracket. The lifting seat is slidably mounted on the lifting guide rail. The first mounting component is detachably connected to the lifting seat, and the touch probe is mounted on the first mounting component.

[0009] Furthermore, the second detection component includes a second bracket and a second mounting component. The second bracket is threadedly fixed to the inner wall of the top of the lighting box, and the second mounting component is detachably connected to the second bracket. The vision camera is mounted on the second mounting component.

[0010] Furthermore, a diffuser plate for scattering light is also provided in the direction of illumination of the lighting source.

[0011] Furthermore, the light-shielding structure is a longitudinal light-shielding plate used to block the light from the center of the lighting source.

[0012] Furthermore, the reflective film completely covers the top wall and the inner surfaces of the opposite side walls of the lighting box. The reflective film includes a release film layer, an adhesive layer, a substrate layer and a reflective layer stacked in sequence. The reflective layer is an aluminum-plated layer or a silver-plated layer, and its surface has a microprism array structure or a metal plating particle structure.

[0013] Furthermore, an equipment cabinet is also provided on the testing platform, and the equipment cabinet is connected and fixed to the lighting box. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the aluminum surface defect detection device according to an embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the lighting box according to an embodiment of the present invention; Figure 3This is a partial structural schematic diagram of a lighting source according to an embodiment of the present invention; Figure 4 This is a partial structural schematic diagram of an aluminum surface defect detection device according to an embodiment of the present invention; Figure 5 This is a partial structural schematic diagram of the touch probe according to another embodiment of the present invention; Figure 6 This is one of the partial structural schematic diagrams of the second detection component according to another embodiment of the present invention; Figure 7 yes Figure 6 A magnified schematic diagram of the structure of part A in the diagram; Figure 8 This is a second partial structural schematic diagram of the second detection component according to another embodiment of the present invention; Figure 9 yes Figure 8 A magnified schematic diagram of part B.

[0015] Explanation of reference numerals in the attached figures: 1. Testing table; 11. Transverse guide rail; 2. Lighting box; 3. First testing component; 31. Touch probe; 311. Base; 3111. Encapsulation part; 3112. Connecting part; 312. Conducting part; 3121. Fixing part; 3122. Stress concentration part; 3123. Receiving part; 313. Mounting groove; 314. Piezoresistive element; 315. Needle tip; 4. Placement base; 41. Support plate; 5. Second testing component; 51. Vision camera; 52. Support shaft; 53. Mounting block; 531. Positioning plate; 532. Cavity 5321, Rectangular block; 5322, Base plate; 5323, Sleeve; 5324, Fixing rod; 5325, Baffle; 5326, First spring; 5327, Clamping tooth; 533, Sliding groove; 5331, Screw; 5332, Gear; 5333, Fixing bracket; 5334, Rack; 534, Groove; 535, Mounting rod; 5351, Locking block; 5352, Second spring; 54, Fixing assembly; 541, Long strip block; 6, Lighting source; 61, Light shielding structure; 62, Diffuser plate; 7, Equipment cabinet. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] In this invention, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0020] like Figures 1-4 As shown, an aluminum surface defect detection device according to an embodiment of the present invention includes a detection platform 1 and a lighting box 2. The detection platform 1 is provided with a first detection component 3 and a placement base 4 for fixing aluminum materials. The first detection component 3 is provided with a touch probe 31 that can be raised and lowered relative to the placement base 4. The lighting box 2 is covered on the detection platform 1. The top of the lighting box 2 is provided with a second detection component 5. The second detection component 5 is provided with a vision camera 51. Lighting sources 6 are installed on the inner sidewalls on both sides of the bottom of the lighting box 2. The illumination direction of the lighting sources 6 is towards the placement base 4, and a light-shielding structure 61 for adjusting the uniformity of illumination is provided in the illumination direction. A reflective film is attached to the inner wall surface of the lighting box 2.

[0021] The aforementioned aluminum surface defect detection equipment, by setting up a lighting box 2 enclosed on the detection table 1 and attaching a reflective film to the inner wall surface of the lighting box 2, and setting up a light-shielding structure 61 in the direction of illumination of the light source 6 to adjust the uniformity of illumination, can provide a uniform, soft and glare-free lighting environment for the aluminum surface, effectively suppressing local overexposure and shadow interference caused by the high reflectivity of aluminum, thereby significantly improving the contrast and clarity of the images acquired by the vision camera 51, so that shallow defects such as scratches, embossing, and oxide spots can be accurately identified; in addition, with the help of a touch probe 31 that can be raised and lowered relative to the base 4 for contact detection, it realizes dual verification of non-contact optical detection and contact flaw detection, solving the problems of high missed detection rate and poor adaptability of existing technologies that rely on manual visual inspection or single optical inspection.

[0022] Preferably, the touch probe 31 is the Harbin Pioneer EP40 inductive touch probe 31. The EP40 senses contact through the conductivity of the workpiece, is specially designed for conductive metals such as aluminum, has a repeatability accuracy of up to 2μm, and IP68 protection is suitable for industrial environments.

[0023] like Figure 5 As shown, in another embodiment of the above-mentioned touch probe, the touch probe includes a base 311, a piezoresistive element 314, and a needle 315. The base 311 includes a conductive part 312 and at least one mounting groove 313. The conductive part 312 extends along the height direction of the base 311, and the mounting groove 313 extends to the conductive part 312. There is at least one piezoresistive element 314, and at least one piezoresistive element 314 is correspondingly disposed in at least one mounting groove 313. The elastic modulus of the needle 315 is greater than the elastic modulus of the piezoresistive element 314. The needle 315 is connected to the conductive part 312 and squeezes the piezoresistive element 314 through the conductive part 312. By utilizing the difference in elastic modulus between the needle tip 315 and the piezoresistive element 314, the needle tip 315 can transmit the contact force to the piezoresistive element 314 through the transmission part 312 when it contacts the aluminum surface. The piezoresistive element 314 generates a stable electrical signal change after being subjected to force, thereby achieving accurate sensing of the contact state. At the same time, the mounting groove 313 reliably limits the piezoresistive element 314 to be located around the transmission part 312, preventing the piezoresistive element 314 from shifting or falling off during use, and improving the stability and repeatability of the probe signal output.

[0024] Specifically, the base 311 has a height of 8mm to 15mm, and the mounting groove 313 has a depth of 0.9mm to 1.2mm. This size range ensures that the piezoresistive element 314 obtains sufficient compression stroke within a limited space, while avoiding excessive overall probe height that would affect the compactness of the device.

[0025] like Figure 5 As shown, the second mounting component further includes multiple corresponding piezoresistive elements 314 and multiple mounting grooves 313. The conductive part 312 is disposed at the center of the base 311, and the multiple mounting grooves 313 are arranged around the conductive part 312. This allows the touch probe to simultaneously collect force signals from multiple directions when it contacts the aluminum surface, avoiding signal deviation or false triggering caused by unilateral force. The multiple piezoresistive elements 314 evenly distributed around the conductive part 312 can perform multi-point balanced detection of the contact force transmitted by the needle 315. Even if there is a slight tilt or local protrusion on the aluminum surface, the contact state can be accurately determined by the signal difference of each piezoresistive element 314, thereby improving the detection accuracy and anti-interference capability of the probe.

[0026] Specifically, two adjacent mounting slots 313 are interconnected. This creates a common accommodating space among the multiple mounting slots 313, facilitating the assembly and positioning of the pressure-resisting component 314 and reducing installation deviations caused by machining errors between multiple independent slots.

[0027] like Figure 5 As shown, in this embodiment, the conducting part 312 includes a fixing part 3121, a stress concentration part 3122, and a receiving part 3123 connected in sequence. The mounting groove 313 extends to the fixing part 3121, and the probe is connected to the receiving part 3123. The cross-sectional diameter of the stress concentration part 3122 is smaller than the cross-sectional diameters of the fixing part 3121 and the receiving part 3123, and the stress concentration part 3122 is located on the central axis of the conducting part 312. By utilizing the reduced diameter of the stress concentration part 3122, the contact force on the probe is concentrated in the central axis region during the conduction process, thereby efficiently transmitting the vertical load to the piezoresistive element 314 and reducing the interference of eccentric force or lateral force on signal acquisition. At the same time, the stress concentration part 3122 is located on the central axis, which can ensure the consistency of the force direction with the control path and avoid uneven signal or response delay of multiple piezoresistive elements 314 due to force transmission deviation.

[0028] like Figure 5 As shown, in this embodiment, the base 311 further includes an encapsulation portion 3111 and a connecting portion 3112 connected to each other. The encapsulation portion 3111 is connected to one side of the connecting portion 3112 and is in the horizontal direction. The edge of the encapsulation portion 3111 protrudes from the connecting portion 3112 to form a first stepped surface. The mounting groove 313 and the conductive portion 312 are both disposed on the connecting portion 3112. The first stepped surface formed by the encapsulation portion 3111 and the connecting portion 3112 provides a clear positioning reference for the overall installation of the probe, making it easy to accurately assemble the touch probe onto the first mounting component or the lifting seat, reducing installation errors. At the same time, the protruding edge design of the encapsulation portion 3111 can effectively protect the internal piezoresistive component 314 and the conductive portion 312, preventing damage to sensitive components from external debris or accidental collisions.

[0029] Specifically, the encapsulation part 3111 and the connecting part 3112 are concentrically arranged circular components, wherein the diameter of the encapsulation part 3111 is 40mm to 50mm, the diameter of the connecting part 3112 is 30mm to 35mm, and the height of the connecting part 3112 is 2mm to 3mm. The stepped structure formed within the above-mentioned size range ensures the overall structural strength of the base 311 and avoids the problems of occupying too much installation space due to excessive size or unstable positioning due to excessive size.

[0030] In this embodiment, the probe extends in the same direction as the conductive part 312, and includes a connecting end, a connecting rod, and a detection end connected in sequence, wherein the connecting end is connected to the conductive part 312. This ensures that the probe and the conductive part 312 are arranged coaxially, guaranteeing efficient transmission of contact force along the same axial direction and avoiding signal attenuation or distortion caused by bending or offset of the force transmission path. At the same time, the three-section design of the connecting end, connecting rod, and detection end facilitates stable connection with the conductive part 312, and allows for appropriate adjustment of the overall length of the probe via the connecting rod to meet the needs of different detection distances. The shape and size of the detection end can be customized according to the surface characteristics of the aluminum material, thereby improving the probe's adaptability to different defect types (such as scratches, pits, and bumps).

[0031] Preferably, the vision camera 51 is a Hikvision MV-CS050-10GC industrial camera. The global shutter can effectively eliminate image trailing when the aluminum material is moving at high speed; the high dynamic range can cope with strong reflective scenes on the aluminum surface and avoid overexposure; practical application cases show that this camera can detect metal scratch defects up to 8μm wide.

[0032] like Figure 1 and Figure 4 As shown, in one embodiment, the testing table 1 is provided with a transverse guide rail 11, and the placement base 4 is slidably mounted on the transverse guide rail 11.

[0033] Specifically, the transverse guide rail 11 is set in a horizontal direction.

[0034] In one embodiment, a transmission plate is connected to the bottom of the placement base 4, and a drive cylinder is installed inside the detection table 1. The output end of the drive cylinder extends to be connected to the transmission plate and is used to control the sliding state of the placement base 4 on the transverse guide rail 11. This achieves automatic and continuous feeding of the aluminum material after it is fixed, allowing the aluminum material to pass smoothly through the detection area of ​​the vision camera 51 and the touch probe 31 below the lighting box 2 without manual pushing or stopping for positioning. This not only reduces the labor intensity of the operators but also ensures the uniformity of the aluminum material's movement speed and the repeatability of its position during the detection process. It avoids image acquisition distortion or probe mis-triggering caused by speed fluctuations or skewness due to manual feeding, thereby further improving the stability and efficiency of defect detection.

[0035] like Figure 4 As shown, in one embodiment, the top of the placement base 4 has a placement groove, and a support plate 41 is installed in the placement groove. The support plate 41 and the groove walls cooperate to form a fixed space adapted to the aluminum material. This allows for rapid positioning and stable clamping of aluminum materials of different sizes or shapes, preventing the aluminum material from shifting or shaking during the detection process, thereby ensuring the accuracy of the contact point of the touch probe 31 and the stability of the imaging field of the vision camera 51.

[0036] like Figure 4 As shown, in one embodiment, the first detection component 3 includes a first bracket, a lifting seat, and a first mounting component. The first bracket is fixed on the detection table 1, and a lifting guide rail is provided on the first bracket. The lifting seat is slidably mounted on the lifting guide rail, and the first mounting component is detachably connected to the lifting seat. The touch probe 31 is mounted on the first mounting component. This allows for flexible adjustment and quick assembly / disassembly of the touch probe 31's height, adapting to the surface detection needs of aluminum materials with different thicknesses or placement postures. It avoids the problem of inaccurate contact with the surface to be tested due to a fixed probe position. Furthermore, the detachable connection method facilitates the replacement or maintenance of the touch probe 31, reducing the later operating costs of the equipment.

[0037] Specifically, the lifting guide rail is set in a vertical direction.

[0038] like Figure 4 As shown, in one embodiment, the second detection component 5 includes a second bracket and a second mounting component. The second bracket is threadedly fixed to the inner top wall of the illumination box 2, and the second mounting component is detachably connected to the second bracket. The vision camera 51 is mounted on the second mounting component. The threaded fixing method ensures the positional stability of the camera during operation, avoiding image shift due to vibration or impact. The detachable second mounting component facilitates the quick replacement of vision cameras 51 of different models or parameters according to detection accuracy requirements or differences in aluminum material specifications.

[0039] like Figures 6-9 As shown, in one embodiment, the second mounting component includes a support shaft 52, a mounting block 53, and a fixing assembly 54. The support shaft 52 is detachably connected to the second bracket. The mounting block 53 is disposed on the support shaft 52, and a vision camera 51 is movably mounted on the mounting block 53. The fixing assembly 54 is disposed on the mounting block 53 and is used to fix the vision camera to the mounting block 53. This allows the vision camera 51 to be flexibly adjusted in position or angle on the mounting block 53, facilitating on-site calibration and focusing according to the specifications, conveying speed, or detection accuracy requirements of the aluminum material. The fixing assembly 54 reliably locks the vision camera 51 in place after adjustment, preventing displacement of the vision camera 51 or blurring of images due to vibration during equipment operation.

[0040] like Figures 6-9As shown, a positioning plate 531 is further fixedly mounted on the mounting block 53, and the positioning plate 531 contacts the vision camera 51. The mounting block 53 has a cavity 532, two sliding grooves 533, and a groove 534 on its top. The positioning plate 531 provides a precise mounting reference for the vision camera 51, ensuring that the camera can quickly return to the standard detection position after each installation or adjustment, thus improving the repeatability of the device. The cavity 532 helps to reduce the overall weight of the mounting block 53 and the load on the support shaft 52, while also providing space for internal wiring or auxiliary components. The two sliding grooves 533 facilitate fine-tuning of the vision camera 51 in the horizontal or vertical direction to adapt to the field of view requirements of different specifications of aluminum materials. The top groove 534 can serve as a fitting part for limiting or fixing structures, enhancing the stability of the vision camera 51 after locking.

[0041] like Figures 6-9 As shown, specifically, the fixing component 54 includes two elongated blocks 541, which are slidably installed in two sliding grooves 533 respectively. The top of the elongated block 541 extends to the outside of the corresponding sliding groove 533 and is fixedly installed with a clamping plate. The clamping plate is provided with a rubber pad for cushioning, which is in contact with the vision camera 51. A rectangular block 5321 is slidably installed in the cavity 532. The top of the rectangular block 5321 extends into the groove 534 and is slidably connected to the inner wall of the groove 534. A base plate 5322 is fixedly installed on the top of the rectangular block 5321, and the base plate 5322 is movably connected to the inner wall of the groove 534. The cooperation between the double long strips 541 and the sliding groove 533 allows the clamping plate to be adjusted synchronously according to the actual width of the vision camera 51, ensuring that the rubber pad is evenly attached to both sides of the camera. This achieves flexible clamping to avoid damage to the camera shell from hard contact, and the cushioning effect of the rubber pad effectively absorbs minor vibrations during equipment operation, preventing image jitter. The sliding cooperation between the rectangular block 5321 and the cavity 532 and the groove 534, as well as the movable connection of the base plate 5322, further enhances the stability of the bottom support of the vision camera 51, allowing the camera to maintain a horizontal posture under multi-point clamping.

[0042] like Figures 6-9As shown, in this embodiment, a screw 5331 is rotatably installed in the sliding groove 533. The screw 5331 passes through the corresponding elongated block 541 and is threadedly connected to the corresponding elongated block 541. Through the threaded engagement between the screw 5331 and the elongated block 541, precise adjustment and self-locking of the clamping plate position are achieved. The operator only needs to rotate the screw 5331 to smoothly drive the elongated block 541 to move along the sliding groove 533, thereby controlling the clamping or loosening of the visual camera 51. The self-locking characteristic of the threaded connection ensures that the adjusted clamping plate position will not be accidentally displaced due to vibration or external force, thus maintaining the stability of the camera fixation for a long time. At the same time, the two screws 5331 control the elongated blocks 541 on both sides respectively, and the clamping position and pressure of each side clamping plate can be adjusted independently to adapt to visual cameras 51 with different widths or slightly different shapes, improving the flexibility and versatility of the fixing component 54.

[0043] like Figures 6-9 As shown, specifically, the ends of the two screws 5331 that are close to each other extend into the cavity 532 and are fixedly fitted with gears 5332. A fixing frame 5333 is provided on one side of the rectangular block 5321, and two racks 5334 are fixedly installed on the fixing frame 5333. The two racks 5334 mesh with the two gears 5332 respectively. Through the transmission cooperation between the racks 5334 and the gears 5332, the vertical lifting motion of the rectangular block 5321 is converted into the synchronous rotational motion of the two screws 5331, which in turn drives the two long blocks 541 and the clamping plates to clamp or release the vision camera 51 synchronously. This ensures the consistency and symmetry of the movement of the clamping plates on both sides and avoids the camera from tilting or being subjected to uneven force due to asynchronous clamping on both sides. At the same time, this linkage mechanism does not require separate operation of the two screws 5331. It only needs to drive the rectangular block 5321 to move up and down to complete the rapid clamping and release of the camera, which significantly improves the convenience of operation and clamping efficiency.

[0044] At the same time, such as Figures 6-9As shown, four sleeves 5323 are fixedly installed on the bottom of the base plate 5322. The bottom ends of the four sleeves 5323 extend into the cavity 532 and are slidably connected to the inner wall of the cavity 532. Four fixing rods 5324 are fixedly installed in the cavity 532. One end of the fixing rod 5324 extends into the corresponding sleeve 5323 and is slidably connected to the inner wall of the corresponding sleeve 5323. A baffle 5325 is fixedly sleeved on the sleeve 5323. A first spring 5326 is slidably sleeved on the fixing rod 5324. One end of the first spring 5326 is fixedly connected to the inner wall of the cavity 532, and the other end of the first spring 5326 is fixedly connected to the corresponding baffle 5325. Through the sliding engagement of the sleeve 5323 and the fixed rod 5324, and the elastic support of the first spring 5326, the base plate 5322 and the vision camera 51 are provided with vertical buffering and reset functions. When the camera is subjected to external impact or the equipment vibrates, the sleeve 5323 can slide up and down along the fixed rod 5324. The first spring 5326 absorbs vibration energy through compression and rebound, effectively attenuating the impact load transmitted to the camera and avoiding camera damage or image blurring caused by rigid connection. At the same time, the four sets of symmetrically distributed sleeve 5323-fixed rod 5324-spring structure ensure that the base plate 5322 is subjected to uniform force, so that the camera always maintains a horizontal posture during the buffering process.

[0045] like Figures 6-9 As shown, further, a plurality of locking teeth 5327 are fixedly arranged in an array on the rectangular block 5321. An installation rod 535 is slidably installed inside the cavity 532. A locking block 5351 is fixedly installed at one end of the installation rod 535, and the locking block 5351 is adapted to the locking teeth 5327. The other end of the installation rod 535 extends to the outside of the cavity 532 and is fixedly installed with a handle. A second spring 5352 is slidably sleeved on the installation rod 535. One end of the second spring 5352 is fixedly connected to the inner wall of the cavity 532, and the other end of the second spring 5352 is fixedly connected to the locking block 5351. Through the cooperation of the locking block 5351 and the array of locking teeth 5327 on the rectangular block 5321, the stepped locking and quick release of the lifting position of the rectangular block 5321 are realized. When the height of the vision camera 51 needs to be adjusted, the operator pulls the mounting rod 535 by the handle, causing the locking block 5351 to disengage from the locking teeth 5327, allowing the rectangular block 5321 to rise and fall freely. After adjustment, releasing the handle causes the elastic restoring force of the second spring 5352 to automatically engage the locking block 5351 with the corresponding locking teeth 5327, achieving self-locking without the need for additional tightening. The array of locking teeth 5327 provides multiple discrete locking positions, facilitating rapid reproduction of preset height positions and improving the efficiency and repeatability of camera focus adjustment.

[0046] Preferably, the lighting source 6 is an LED light panel.

[0047] like Figure 3As shown, in one embodiment, a diffuser plate 62 for scattering light is also provided in the illumination direction of the illumination source 6. This makes the light illuminating the aluminum surface softer and more uniform, effectively avoiding local light spots or strong reflected glare caused by the light source shining directly on the highly reflective surface of the aluminum material. This significantly reduces the phenomenon of highlight overflow during image acquisition and improves the contrast and detail clarity of the images acquired by the visual camera 51.

[0048] In one embodiment, the light-shielding structure 61 is a longitudinal light-shielding plate used to block the light from the center of the lighting source 6. It can specifically suppress the strong light directly hitting the aluminum surface from the central area of ​​the lighting source 6, avoiding the formation of a large central bright spot or specular reflection glare on the highly reflective surface of the aluminum material due to excessive light in the center, while retaining the uniform supplementary lighting effect of the light from both sides on the edges and surface texture of the aluminum material, thereby effectively improving the uniformity of the lighting field.

[0049] Specifically, the longitudinal light-shielding plate is a flat, thin sheet attached to the surface of the diffuser plate 62 above the lighting source 6.

[0050] Specifically, the diffuser is positioned on the light-emitting side of the lighting source, and the longitudinal light-shielding plate is attached to the light-emitting surface of the diffuser and extends along the length of the lighting source.

[0051] In one embodiment, the reflective film completely covers the top wall and the inner surfaces of the opposite side walls of the lighting box 2. The reflective film includes a release film layer, an adhesive layer, a substrate layer, and a reflective layer stacked sequentially. The reflective layer is an aluminum-plated layer or a silver-plated layer, and its surface has a microprism array structure or a metal-plated particle structure. The microprism array structure can achieve directional and efficient specular reflection, while the metal-plated particle structure can diffuse light. The two can be selected or combined according to actual needs to make the light irradiated on the aluminum surface more uniform and softer, effectively avoiding interference from local bright spots or glare on the imaging of the vision camera 51. At the same time, the reflective film completely covers the top wall and the side walls, reducing the light energy loss inside the lighting box 2 and improving the utilization rate of the light source.

[0052] In another embodiment, the reflective film is preferably a specular reflective film or a diffuse reflective film.

[0053] like Figure 1 and Figure 4 As shown, in one embodiment, the testing station 1 is also equipped with an equipment cabinet 7, which is connected and fixed to the lighting box 2. This reduces the space occupied by the dispersed arrangement of equipment, while improving the integrity and stability of the overall structure, and avoiding signal interference or testing errors caused by loose external cables or equipment vibration.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A surface defect detection device for aluminum materials, characterized in that, include: The testing platform is equipped with a first testing component and a placement base for fixing aluminum materials. The first testing component is equipped with a touch probe that can be raised and lowered relative to the placement base. The lighting box is mounted on the testing platform. A second testing component is provided on the top of the lighting box, and a vision camera is provided on the second testing component. Lighting sources are installed on the inner side walls on both sides of the bottom of the lighting box. The illumination direction of the lighting sources is towards the placement base, and a light-shielding structure for adjusting the uniformity of illumination is provided in the illumination direction. A reflective film is attached to the inner wall surface of the lighting box.

2. The aluminum surface defect detection equipment according to claim 1, characterized in that, The testing platform is equipped with a transverse guide rail, and the placement base is slidably mounted on the transverse guide rail.

3. The aluminum surface defect detection equipment according to claim 2, characterized in that, The bottom of the placement base is connected to a transmission plate, and a drive cylinder is installed inside the detection platform. The output end of the drive cylinder extends to be connected to the transmission plate and is used to control the sliding state of the placement base on the transverse guide rail.

4. The aluminum surface defect detection equipment according to claim 1, characterized in that, The top of the placement base has a placement groove, and a support plate is installed in the placement groove. The support plate and each groove wall of the placement groove cooperate to form a fixed space that is compatible with the aluminum material.

5. The aluminum surface defect detection equipment according to claim 1, characterized in that, The first detection component includes a first bracket, a lifting seat, and a first mounting component. The first bracket is fixed on the detection table, and a lifting guide rail is provided on the first bracket. The lifting seat is slidably mounted on the lifting guide rail. The first mounting component is detachably connected to the lifting seat, and the touch probe is mounted on the first mounting component.

6. The aluminum surface defect detection equipment according to claim 1, characterized in that, The second detection component includes a second bracket and a second mounting component. The second bracket is threadedly fixed to the inner wall of the top of the lighting box, and the second mounting component is detachably connected to the second bracket. The vision camera is mounted on the second mounting component.

7. The aluminum surface defect detection equipment according to claim 1, characterized in that, A diffuser plate for scattering light is also provided in the direction of illumination of the lighting source.

8. The aluminum surface defect detection equipment according to claim 1, characterized in that, The light-shielding structure is a longitudinal light-shielding plate used to block the light from the center of the lighting source.

9. The aluminum surface defect detection equipment according to claim 1, characterized in that, The reflective film completely covers the top wall and the inner surfaces of the opposite side walls of the lighting box. The reflective film includes a release film layer, an adhesive layer, a substrate layer and a reflective layer stacked in sequence. The reflective layer is an aluminum-plated layer or a silver-plated layer, and its surface has a microprism array structure or a metal plating particle structure.

10. The aluminum surface defect detection equipment according to claim 1, characterized in that, The testing platform is also equipped with an equipment cabinet, which is connected and fixed to the lighting box.

Images