Surface defect detection device and automatic surface defect detection equipment thereof

Abstract

The surface defect detection device comprises a vertical placement plate, a vertical annular light source is attached to one end of the vertical placement plate, a lower mounting frame is mounted on one side of the bottom of the vertical annular light source, an upper mounting frame is mounted on one side of the top of the vertical annular light source, and a to-be-detected object station is arranged between the upper mounting frame and the lower mounting frame; a first lower reflective mirror is arranged on one side in the lower mounting frame, a second lower reflective mirror is arranged on the other side in the lower mounting frame, a first upper reflective mirror matched with the first lower reflective mirror is arranged on one side in the upper mounting frame, a second upper reflective mirror is arranged on the other side in the upper mounting frame, and a bisection reflective mirror is arranged in the middle between the first upper reflective mirror and the second upper reflective mirror. The upper mounting frame is provided with a detection window, and a camera is arranged above the detection window; 2, the automatic surface defect detection equipment comprises a rack, a lifting driving module, a connecting frame and a rotary driving module, the rotary driving module is provided with a surface defect detection device, and the bottom of the rotary driving module is provided with a placement plate.

Description

Technical Field

[0001] This invention relates to the technical field of surface defect detection, and in particular to a surface defect detection device and its automated surface defect detection equipment. Background Technology

[0002] In industrial inspection, the detection of surface defects is a crucial aspect of quality control. Currently, a common method for surface defect detection involves placing a coaxial or ring light source on the side of the object under test, along with a camera to capture images. Simultaneously, a rotational drive mechanism rotates the object a full circle, allowing the camera to acquire images of the entire side of the object. (That is, detection is performed via the camera -> the axial direction of the coaxial or ring light source -> the side of the object.) This method can acquire side images of the object under bright field illumination and has good detection capabilities for macroscopic appearance features such as contamination and color differences on the surface, and is widely used in actual production.

[0003] However, the aforementioned existing technical solutions have significant shortcomings. Because these solutions can only achieve bright-field illumination, the camera can only acquire bright-field images of the side of the object under test. This results in low sensitivity for detecting microscopic defects such as fine scratches, dents, and protrusions on the surface of the object, easily leading to missed detections. Dark-field illumination, on the other hand, can precisely compensate for this deficiency. It is more sensitive to subtle changes in surface morphology and can effectively detect defects that are difficult to detect under bright-field illumination.

[0004] Therefore, the existing technical solutions mentioned above have the technical defect of not being able to achieve both bright field illumination and dark field illumination in a single inspection process. As a result, in industrial inspection, if it is necessary to detect both types of defects, different optical devices need to be replaced for separate inspections. This makes the operation cumbersome and the inspection efficiency low, making it difficult to meet the requirements of inspection efficiency and comprehensiveness in the industrial inspection field. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a surface defect detection device and its automated surface defect detection equipment, which can simultaneously realize bright field illumination detection and dark field illumination detection of the side of the object to be tested.

[0006] To achieve the above objectives, the present invention provides a solution through the following two aspects:

[0007] In a first aspect, the present invention provides a surface defect detection device, comprising a vertical placement plate, a vertical annular light source attached to one end of the vertical placement plate, a lower mounting frame mounted on one side of the bottom of the vertical annular light source, an upper mounting frame mounted on one side of the top of the vertical annular light source, a test object station between the upper and lower mounting frames, a first lower reflector mounted on one side of the lower mounting frame, and a second lower reflector mounted on the other side, a first upper reflector cooperating with the first lower reflector mounted on one side of the upper mounting frame, and a second upper reflector cooperating with the second lower reflector mounted on the other side, a bipartite reflector respectively cooperating with the first and second upper reflectors in the middle between the first and second upper reflectors, and a detection window corresponding to the position of the bipartite reflector opened on the upper mounting frame, and a camera mounted above the detection window.

[0008] Preferably, the vertical placement plate has horizontal adjustment slots on both sides and a vertical adjustment slot on the upper side. The vertical annular light source is fixed to the two horizontal adjustment slots on both sides by bolts, and the upper side of the vertical annular light source is fixed to the vertical adjustment slot by bolts.

[0009] Preferably, the vertical ring light source includes a perimeter, a ring-shaped LED bead installed inside the perimeter, and a ring-shaped diffuser plate installed on one side of the ring-shaped LED bead. The perimeter is connected to a power line electrically connected to the ring-shaped LED bead.

[0010] Preferably, the lower mounting frame has at least one first horizontal movement adjustment groove on one side and at least one second horizontal movement adjustment groove on the other side. The first lower reflector is fixed to the first horizontal movement adjustment groove by bolts, and the second lower reflector is fixed to the second horizontal movement adjustment groove by bolts.

[0011] Preferably, a first linear movement adjustment groove is provided on one side of the upper mounting frame, and a plurality of parallel first arc adjustment grooves are provided above the first linear movement adjustment groove. A second linear movement adjustment groove is provided on the other side of the upper mounting frame, and a plurality of parallel second arc adjustment grooves are provided above the second linear movement adjustment groove. The first upper reflector is fixed to the first linear movement adjustment groove and one of the first arc adjustment grooves by bolts, and the second upper reflector is fixed to the second linear movement adjustment groove and one of the second arc adjustment grooves by bolts.

[0012] Preferably, the top of the vertical placement plate is equipped with a suspension bracket, and the camera is mounted on the suspension bracket.

[0013] Preferably, the suspension bracket includes a vertical bracket mounted on the top of the vertical placement plate and a horizontal bracket mounted on the vertical bracket. The vertical bracket has a height adjustment groove, and the horizontal bracket is fixed to the height adjustment groove by bolts.

[0014] In a second aspect, the present invention provides an automated surface defect detection device, including a frame, a lifting drive module mounted on the frame, a connecting frame mounted on the lifting drive module, a rotation drive module mounted on the connecting frame, a surface defect detection device as described in the first aspect mounted on the rotation drive module, and a placement plate for placing the object to be tested mounted at the bottom of the rotation drive module.

[0015] Preferably, the vertical placement plate of the surface defect detection device is mounted on the rotary drive module.

[0016] Preferably, the lifting drive module is a lifting slide module or a guide rod cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. A surface defect detection device of the present invention can perform bright field illumination detection and dark field illumination detection on the test object respectively:

[0019] Bright field illumination detection: The diffused light from the vertical ring light source shines on the upper side of the object under test and into the camera, thus forming bright field illumination. Under bright field illumination, the camera performs bright field illumination detection on both sides of the upper side of the object under test (separated by a bipartite mirror).

[0020] Dark-field illumination detection: The diffused light from the vertical ring light source shines on the lower side of the object under test. One side of the lower side of the object under test reflects light onto the first lower mirror, which refracts it onto the first upper mirror. The first upper mirror refracts it onto one side of the split mirror. Similarly, the other side of the lower side of the object under test reflects light onto the second lower mirror, which refracts it onto the second upper mirror. The second upper mirror refracts it onto the other side of the split mirror. At this time, the split mirror presents the dark-field illumination images of both sides of the lower side of the object under test. The camera performs dark-field illumination detection on both sides of the lower side of the object under test through the split mirror.

[0021] 2. The automated surface defect detection equipment of the present invention, through the cooperation of the above-mentioned surface defect detection device with the lifting drive module, the connecting frame, the rotating drive module and the placement plate, realizes bright field illumination detection and dark field illumination detection of the side of the object to be tested.

[0022] 3. In summary, the surface defect detection device and its automated surface defect detection equipment provided by the present invention are used to realize bright field illumination detection and dark field illumination detection of the surface of the object to be tested, thereby facilitating the detection operation, effectively improving the detection efficiency, and ensuring the comprehensiveness of the detection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 These are schematic diagrams of the surface defect detection device provided in Embodiments 1 and 2 of the present invention;

[0025] Figure 2 This is a schematic diagram of the surface defect detection device provided in Embodiments 1 and 2 of the present invention, omitting the front plate of the upper and lower mounting frames;

[0026] Figure 3 These are exploded structural diagrams of a surface defect detection device provided in Embodiments 1 and 2 of the present invention;

[0027] Figure 4 These are schematic diagrams of the vertical ring light source provided in Embodiments 1 and 2 of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of an automated surface defect detection device provided in Embodiment 2 of the present invention.

[0029] The diagram includes:

[0030] 1. Frame; 2. Lifting drive module; 3. Connecting frame; 4. Rotation drive module; 5. A surface defect detection device; 51. Vertical placement plate; 511. Horizontal adjustment groove; 512. Vertical adjustment groove; 52. Vertical annular light source; 521. Perimeter; 523. Annular diffuser plate; 524. Power cord; 53. Lower mounting frame; 531. First lower reflector; 532. Second lower reflector; 536. First horizontal movement adjustment groove; 537. Second horizontal movement adjustment groove. 54. Adjustment slot; 55. Test object station; 56. Upper mounting frame; 57. First upper reflector; 58. Second upper reflector; 59. Dividing reflector; 50. Detection window; 51. First linear movement adjustment slot; 52. First arc adjustment slot; 53. Second linear movement adjustment slot; 54. Second arc adjustment slot; 55. Suspension bracket; 56. Vertical bracket; 57. Horizontal bracket; 58. Height adjustment slot; 59. Camera; 6. Placement plate. Detailed Implementation

[0031] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] Please see Figures 1 to 4 Embodiment 1 of the present invention provides a surface defect detection device. The surface defect detection device includes a vertical placement plate 51, with a vertical annular light source 52 attached to one end of the vertical placement plate 51. A lower mounting frame 53 is installed on one side of the bottom of the vertical annular light source 52, and an upper mounting frame 55 is installed on one side of the top of the vertical annular light source 52. A test object station 54 is provided between the upper mounting frame 55 and the lower mounting frame 53. A first lower reflector 531 is installed on one side of the lower mounting frame 53, and a second lower reflector 532 is installed on the other side. Inside the mounting frame 55, a first upper reflector 551 is installed on one side to cooperate with the first lower reflector 531, and a second upper reflector 552 is installed on the other side to cooperate with the second lower reflector 532. A bipartite reflector 553 is provided in the middle between the first upper reflector 551 and the second upper reflector 552 to cooperate with the first upper reflector 551 and the second upper reflector 552 respectively. A detection window 555 corresponding to the position of the bipartite reflector 553 is opened on the upper mounting frame 55, and a camera 57 is installed above the detection window 555.

[0034] The vertical placement plate 51 has horizontal adjustment slots 511 on both sides and a vertical adjustment slot 512 on the top side. The vertical ring light source 52 is fixed to the two horizontal adjustment slots 511 on both sides by bolts, and the top side of the vertical ring light source 52 is fixed to the vertical adjustment slot 512 by bolts. The horizontal adjustment slots 511 and vertical adjustment slots 512 facilitate the horizontal and vertical position adjustment of the vertical ring light source 52, and also allow for the replacement of the specifications of the vertical ring light source 52, thus flexibly adapting to test objects of different sizes and specifications. This improves the versatility and applicability of the surface defect detection device in this embodiment, and is convenient to adjust and simple to operate.

[0035] The vertical ring light source 52 includes a perimeter 521, a ring-shaped LED bead (a prior art technology, not shown in the accompanying drawings) installed inside the perimeter 521, and a ring-shaped diffuser plate 523 installed on one side of the ring-shaped LED bead. A power line 524 electrically connected to the ring-shaped LED bead is connected to the perimeter 521. The perimeter 521 facilitates the installation and fixation of the ring-shaped LED bead, and the ring-shaped diffuser plate 523 diffuses the light emitted by the ring-shaped LED bead into scattered, diffused light.

[0036] The lower mounting frame 53 has at least one first horizontal adjustment slot 536 on one side and at least one second horizontal adjustment slot 537 on the other side. A first lower reflector 531 is fixed to the first horizontal adjustment slot 536 with bolts, and a second lower reflector 532 is fixed to the second horizontal adjustment slot 537 with bolts. By providing the first horizontal adjustment slot 536 and the second horizontal adjustment slot 537 on both sides of the lower mounting frame 53, the first lower reflector 531 and the second lower reflector 532 can be adjusted in the horizontal direction. This allows for flexible adjustment of the positions of the two lower reflectors 531 and 532 according to the size of the object under test and the requirements of the reflection path, ensuring accurate correspondence of the reflected light path and thus guaranteeing the imaging quality of the dark field illumination. It also enhances the adaptability of the surface defect detection device of this embodiment to objects of different specifications.

[0037] A first linear movement adjustment groove 556 is provided on one side of the upper mounting frame 55. Several parallel first arc adjustment grooves 557 are provided above the first linear movement adjustment groove 556. A second linear movement adjustment groove 558 is provided on the other side of the upper mounting frame 55. Several parallel second arc adjustment grooves 559 are provided above the second linear movement adjustment groove 558. A first upper reflector 551 is fixed to the first linear movement adjustment groove 556 and one of the first arc adjustment grooves 557 by bolts. A second upper reflector 552 is fixed to the second linear movement adjustment groove 558 and one of the second arc adjustment grooves 559 by bolts. By setting linear movement adjustment slots and multiple parallel arc adjustment slots on both sides of the upper mounting frame 55, the first upper reflector 551 and the second upper reflector 552 can be moved and adjusted in a straight line, and the angles of the first upper reflector 551 and the second upper reflector 552 can be changed by selecting different arc adjustment slots. This achieves dual adjustment of the optical path angle and position, thereby enabling precise matching of the reflected optical path when different sizes of the objects to be measured and different positions of the first lower reflector 531 and the second lower reflector 532 are used, ensuring that the dark field illumination image is clearly and accurately detected by the camera 57.

[0038] A suspension bracket 56 is mounted on the top of the vertical placement plate 51, and the camera 57 is mounted on the suspension bracket 56.

[0039] The suspension bracket 56 includes a vertical bracket 561 mounted on the top of the vertical placement plate 51 and a horizontal bracket 562 mounted on the vertical bracket 561. The vertical bracket 561 has a height adjustment slot 563, and the horizontal bracket 562 is fixed to the height adjustment slot 563 by bolts. The horizontal bracket 562 can be adjusted vertically via bolts in the height adjustment slot 563, thereby flexibly adjusting the height of the camera 57 to accommodate objects of different thicknesses or different focal length requirements, ensuring that the camera 57 can always clearly capture the image at the detection window 555, thus improving the applicability of the detection.

[0040] The working principle and advantages of the surface defect detection device of Embodiment 1 of the present invention are described in Embodiment 2 below.

[0041] Example 2:

[0042] Please see Figures 1 to 5 Embodiment 2 of the present invention provides an automated surface defect detection device, including a frame 1, a lifting drive module 2 mounted on the frame 1, a connecting frame 3 mounted on the lifting drive module 2, a rotation drive module 4 mounted on the connecting frame 3, a surface defect detection device as described in the embodiment mounted on the rotation drive module 4, and a placement plate 6 for placing the object to be tested mounted at the bottom of the rotation drive module 4.

[0043] A vertical placement plate 51 of a surface defect detection device is mounted on a rotary drive module 4.

[0044] The lifting drive module 2 is a ball screw module, a lifting slide module, a guide rod cylinder, or other mechanical drive components driven by linear drive.

[0045] Rotary drive module 4 is an electric rotary table.

[0046] An automated surface defect detection device according to Embodiment 2 of the present invention has the following working principle:

[0047] S1: Fix the object to be tested on the placement plate 6;

[0048] S2: The lifting drive module 2 drives a surface defect detection device to descend, so that the object to be tested extends into the object to be tested station 54 between the upper mounting frame 55 and the lower mounting frame 53.

[0049] S3: Vertical ring light source 52 emits light;

[0050] S4: A portion of the diffused light from the vertical ring light source 52 hits the upper side of the object under test and the camera 57, thus forming a bright field illumination; the camera 57 illuminates the upper side of the object under test on both sides of the detection window 555 (at this time, the middle of the camera 57 is blocked by the bipartite mirror 553).

[0051] S5: A portion of the diffused light from the vertical ring light source 52 falls on the lower side of the object under test, including:

[0052] The light from one side of the lower side of the object under test is reflected onto the first lower reflector 531, which is then refracted onto the first upper reflector 551. The first upper reflector 551 is then refracted onto one side of the bipartite reflector 553, which is observed by the camera 57. The light from the bipartite reflector 553 is dark field illumination.

[0053] The light from the other side of the lower side of the object under test is reflected onto the second lower mirror 532, which is then refracted onto the second upper mirror 552. The second upper mirror 552 is then refracted onto the other side of the bipartite mirror 553, which is observed by the camera 57. The light from the other side of the bipartite mirror 553 is dark field illumination.

[0054] S6: The rotary drive module 4 drives a surface defect detection device to rotate one revolution, allowing the camera 57 to observe both the bright-field illumination and dark-field illumination of the side surface of the object under test in one revolution. Imaging of the bright-field illumination of this side surface can be achieved using existing optical processing techniques, as can imaging of the dark-field illumination. Furthermore, existing optical processing techniques can also perform comparative fusion analysis of the bright and dark illumination, facilitating richer comparative analysis of the side surface of the object under test and reducing the false negative and false positive rates.

[0055] An automated surface defect detection device according to Embodiment 2 of the present invention has the following advantages:

[0056] First: A surface defect detection device can achieve one full rotation of bright field illumination and dark field illumination on the side surface of the object to be tested;

[0057] The advantage of bright field illumination is that it can effectively detect the appearance and macroscopic features of the side surface of the object to be tested, such as surface contamination and color.

[0058] The advantage of dark field illumination is that it is more sensitive and accurate in detecting depressions, scratches, and protrusions on the surface of the object being tested.

[0059] Second: A set of automated surface defect detection equipment can provide both bright field illumination and dark field illumination for the object under test, thereby facilitating the detection operation, effectively improving detection efficiency, and ensuring the comprehensiveness of the detection.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface defect detection device, characterized in that, The device includes a vertical placement plate (51), one end of which is attached to a vertical ring light source (52). A lower mounting frame (53) is installed on one side of the bottom of the vertical ring light source (52), and an upper mounting frame (55) is installed on one side of the top of the vertical ring light source (52). A test object station (54) is provided between the upper mounting frame (55) and the lower mounting frame (53). A first lower reflector (531) is installed on one side of the lower mounting frame (53), and a second lower reflector (532) is installed on the other side. A device connected to the first lower reflector (531) is installed on one side of the upper mounting frame (55). A first upper mirror (551) is fitted with a lower mirror (531), and a second upper mirror (552) is fitted with a second lower mirror (532) on the other side. A bipartite mirror (553) is provided in the middle between the first upper mirror (551) and the second upper mirror (552), respectively fitted with the first upper mirror (551) and the second upper mirror (552). A detection window (555) corresponding to the position of the bipartite mirror (553) is opened on the upper mounting frame (55), and a camera (57) is installed above the detection window (555).

2. The surface defect detection device according to claim 1, characterized in that, The vertical placement plate (51) has horizontal adjustment grooves (511) on both sides, and a vertical adjustment groove (512) is provided on the upper side of the vertical placement plate (51). The vertical ring light source (52) is fixed to the two horizontal adjustment grooves (511) on both sides by bolts, and the upper side of the vertical ring light source (52) is fixed to the vertical adjustment groove (512) by bolts.

3. The surface defect detection device according to claim 1, characterized in that, The vertical ring light source (52) includes a perimeter (521), a ring LED bead installed inside the perimeter (521), and a ring diffuser plate (523) installed on one side of the ring LED bead. The perimeter (521) is connected to a power line (524) that is electrically connected to the ring LED bead.

4. The surface defect detection device according to claim 1, characterized in that, The lower mounting frame (53) has at least one first horizontal movement adjustment groove (536) on one side and at least one second horizontal movement adjustment groove (537) on the other side. The first lower reflector (531) is fixed to the first horizontal movement adjustment groove (536) by bolts, and the second lower reflector (532) is fixed to the second horizontal movement adjustment groove (537) by bolts.

5. The surface defect detection device according to claim 1, characterized in that, The upper mounting frame (55) has a first linear movement adjustment groove (556) on one side, and several parallel first arc adjustment grooves (557) are provided above the first linear movement adjustment groove (556). The upper mounting frame (55) has a second linear movement adjustment groove (558) on the other side, and several parallel second arc adjustment grooves (559) are provided above the second linear movement adjustment groove (558). The first upper reflector (551) is fixed to the first linear movement adjustment groove (556) and one of the first arc adjustment grooves (557) by bolts. The second upper reflector (552) is fixed to the second linear movement adjustment groove (558) and one of the second arc adjustment grooves (559) by bolts.

6. The surface defect detection device according to claim 1, characterized in that, The vertical placement plate (51) is equipped with a suspension bracket (56) on top, and the camera (57) is mounted on the suspension bracket (56).

7. A surface defect detection device according to claim 6, characterized in that, The suspension bracket (56) includes a vertical bracket (561) installed on the top of the vertical placement plate (51) and a horizontal bracket (562) installed on the vertical bracket (561). The vertical bracket (561) is provided with a height adjustment groove (563), and the horizontal bracket (562) is fixed to the height adjustment groove (563) by bolts.

8. An automated surface defect detection device, comprising a frame (1), characterized in that, The frame (1) is equipped with a lifting drive module (2), the lifting drive module (2) is equipped with a connecting frame (3), the connecting frame (3) is equipped with a rotation drive module (4), the rotation drive module (4) is equipped with a surface defect detection device as described in any one of claims 1-7, and the bottom of the rotation drive module (4) is equipped with a placement plate (6) for placing the object to be tested.

9. An automated surface defect detection device according to claim 8, characterized in that, The vertical placement plate (51) of the surface defect detection device is mounted on the rotary drive module (4).

10. An automated surface defect detection device according to claim 8, characterized in that, The lifting drive module (2) is a ball screw module, a lifting slide module, or a guide rod cylinder.

Images