Workpiece appearance detection equipment and detection method thereof

Abstract

The invention relates to workpiece appearance detection equipment and a detection method thereof.The workpiece appearance detection equipment comprises a rack, a transparent bearing disc rotationally borne on the rack, a feeding mechanism and a discharging mechanism, the feeding mechanism and the discharging mechanism are connected to the transparent bearing disc, and a size detection mechanism, a surface defect detection mechanism and a removing mechanism are sequentially arranged on the rack; the surface defect detection mechanism comprises an axial surface detection assembly and a radial end face detection assembly, and the size detection mechanism is used for detecting the size of a workpiece on the transparent bearing disc. The first surface image, the second surface image, the third surface image, the fourth surface image and the two end face images in the radial direction of a workpiece are collected through cooperation of the axial surface detection assembly and the radial end face detection assembly, the collected image information is processed through the controller, and the unqualified workpiece is removed through the removing mechanism. According to the invention, the surface of the workpiece in the circumferential direction can be completely detected, and the efficiency of comprehensive detection of workpieces produced in batches can be improved.

Description

Technical Field

[0001] This application relates to the field of workpiece appearance inspection technology, and in particular to a workpiece appearance inspection device and its inspection method. Background Technology

[0002] After the batch manufacturing of workpieces is completed, a comprehensive inspection process must be carried out to ensure that their appearance quality meets the standards (design standards and usage specifications). This inspection identifies workpieces with defects such as cracks and flaws (non-conforming products), and then sorts them from conforming products to prevent non-conforming products from entering subsequent production processes or being used in applications.

[0003] For example, consider a ceramic workpiece with a cylindrical outer contour that needs to be mass-produced. Due to factors such as material properties, production processes, and transportation, some defective workpieces, including fragments, axial cracks, dents, and nail-shaped cracks, may be mixed in after mass production, depending on the process requirements and application scenarios. To facilitate the separation of qualified and defective workpieces, dimensional inspection equipment is used to inspect the dimensions of the workpieces after production, and workpieces that do not meet the dimensional requirements are removed. Workpieces that pass the dimensional inspection are then transferred to visual inspection equipment, where a scanning camera captures images of the workpiece surface, and a controller determines whether the workpiece is qualified.

[0004] For cylindrical workpieces, due to their shape and contour characteristics, after the workpiece is placed on the appearance inspection equipment, a portion of the workpiece is in contact with the equipment, creating a blind spot for the scanning camera. If we define the total circumferential surface area of ​​the workpiece as 1, the scanning camera cannot capture a complete circumferential surface image of the workpiece in a single scan (the area is between 66% and 80% of the total workpiece area). In other words, the surface image of the part of the workpiece in contact with the appearance inspection equipment cannot be captured. In scenarios where some workpieces have high appearance requirements, a secondary inspection is still necessary. Furthermore, after the workpiece passes dimensional inspection, it needs to be transferred to the appearance inspection equipment. During this transfer, the workpiece is subjected to vibration or pressure, which can still cause bumps or damage. Summary of the Invention

[0005] The purpose of this invention is to provide a workpiece appearance inspection device and method to perform complete inspection of the circumferential surface of a workpiece and improve the efficiency of comprehensive inspection of workpieces produced in batches.

[0006] First aspect

[0007] The workpiece appearance inspection device provided in this application adopts the following technical solution:

[0008] A workpiece appearance inspection device includes a frame and a transparent support plate rotatably supported on the frame, as well as a loading mechanism and a unloading mechanism disposed on the frame and connected to the transparent support plate. A dimension inspection mechanism, a surface defect inspection mechanism, and a rejection mechanism are sequentially arranged on the frame between the loading mechanism and the unloading mechanism. The surface defect inspection mechanism includes an axial surface inspection component and a radial end face inspection component. The axial surface inspection component includes a first camera, a second camera, a third camera, and a fourth camera. The first and second cameras are used to acquire images of a first and a second surface of the workpiece, and the third and fourth cameras are used to acquire images of a third and a fourth surface of the workpiece. The radial end face inspection component includes a fifth camera and a sixth camera, which acquire images of the end face of the workpiece.

[0009] Preferably, the transparent support plate has a circumferential groove on its surface.

[0010] Preferably, the frame is provided with a main adjustment frame, the first camera and the second camera slide and cooperate with the main adjustment frame along the height direction of the main adjustment frame, the detection ends of the first camera and the second camera are arranged opposite to each other, the third camera and the fourth camera are movably connected to the main adjustment frame along the horizontal direction, and the detection ends of the third camera and the fourth camera are arranged opposite to each other, and the detection ends of the first camera, the second camera, the third camera and the fourth camera all face the transparent support plate.

[0011] Preferably, the transparent carrier plate is made of optical glass.

[0012] Preferably, sub-adjustment frames are provided on the racks located on both sides of the main adjustment frame, and the fifth camera and the sixth camera are respectively installed on the sub-adjustment frames located on both sides of the main adjustment frame.

[0013] Preferably, the rejection mechanism includes an adjustment component and a high-frequency solenoid valve. The adjustment component is disposed on the frame between the sixth camera and the unloading mechanism, and the high-frequency solenoid valve is disposed on the adjustment component, with the output end of the high-frequency solenoid valve facing the transparent support plate.

[0014] Preferably, a connecting seat is movably connected to the sub-adjustment frame, and the connecting seat is provided with bolt holes. The fifth camera is fixed to the connecting seat with bolts through the bolt holes. The connecting seat has an arc-shaped waist-shaped groove with the center point of the bolt holes as the base point, and a scale is provided on the arc-shaped waist-shaped groove.

[0015] Preferably, it further includes a cleaning mechanism, which is disposed on the frame near the unloading mechanism and located between the unloading mechanism and the loading mechanism. The cleaning mechanism includes a cleaning component and a protective cover. The cleaning component is rotatably supported within the protective cover. The protective cover is mounted above the transparent support plate. A negative pressure pipeline is connected to the protective cover, and a rotation gap is provided between the surface of the protective cover facing the transparent support plate and the surface of the transparent support plate facing the protective cover.

[0016] Second aspect

[0017] This application also proposes a detection method for workpiece appearance inspection equipment, including the following steps:

[0018] S1. The workpiece is fed onto the transparent support plate that rotates along the frame by the feeding mechanism;

[0019] S2. When the workpiece arrives at the dimension detection mechanism, the dimension of the workpiece is detected by the dimension detection mechanism, the current position information and motion information of the workpiece are recorded and sent to the controller;

[0020] S3. When the workpiece reaches the fifth camera, the fifth camera captures an image of the workpiece's end face and sends it to the controller;

[0021] S4. When the workpiece reaches below the detection end of the first camera, the first camera and the second camera acquire images of the first and second surfaces of the workpiece. At the same time, the third camera and the fourth camera acquire images of the third and fourth surfaces of the workpiece. The acquired images of the first surface, the second surface, the third surface, and the fourth surface are synchronously sent to the controller.

[0022] S5. When the workpiece reaches the sixth camera, the image of the other end face of the workpiece after step S3 is acquired by the sixth camera and the acquired image is sent to the controller.

[0023] S6. The controller processes the images acquired in steps S2-S5 to determine whether the workpiece is qualified.

[0024] Compared with the prior art, the present invention provides a workpiece appearance inspection device and its inspection method, which has the following beneficial effects:

[0025] 1. The size of the workpiece located on the transparent support plate is detected by the size detection mechanism, and the images of the two end faces of the workpiece along the radial direction are collected by the fifth and sixth cameras. The images of the first, second, third and fourth surfaces of the workpiece are collected simultaneously by the first, second, third and fourth cameras, so as to achieve the purpose of all-round acquisition of the axial surface images of the workpiece, so as to avoid the situation of missing axial surface images of the workpiece. Since the frame is also equipped with a rejection mechanism, unqualified workpieces are directly rejected by the rejection mechanism, which plays a positive guiding role in improving the efficiency of comprehensive inspection of workpieces in batch production.

[0026] 2. The workpiece is supported by the limiting groove, so that the workpieces fed to the transparent support plate by the feeding mechanism can be arranged regularly along the surface of the transparent support plate, which is convenient for image acquisition and rejection mechanism. At the same time, the limiting groove helps to improve the adaptability of the transparent support plate, meet the support requirements of workpieces of different diameters, and has high flexibility.

[0027] 3. The cleaning mechanism removes foreign objects from the transparent carrier plate, reducing the probability of interference caused by foreign objects during image acquisition by the dimensional inspection and surface defect inspection mechanisms. This plays a positive guiding role in maintaining the accuracy of the inspection results of the dimensional inspection and surface defect inspection mechanisms. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a workpiece appearance inspection device according to an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the surface defect detection mechanism in a workpiece appearance inspection device according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the dimensional detection mechanism in a workpiece appearance inspection device according to an embodiment of this application.

[0031] Figure 4 yes Figure 1 A magnified structural diagram of part A in the middle.

[0032] Figure 5 This is a schematic diagram of the axial surface inspection component in a workpiece appearance inspection device according to an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the cleaning mechanism in a workpiece appearance inspection device according to an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the rejection mechanism in a workpiece appearance inspection device according to an embodiment of this application.

[0035] Figure 8 This is a flowchart of the detection method steps applied to a workpiece appearance inspection device according to this application.

[0036] Figure 9 This is a schematic diagram of the controller display interface of a workpiece appearance inspection device during workpiece inspection, as described in this embodiment of the application.

[0037] Figure 10 This is a schematic diagram of the partitioning of the first, second, third, and fourth surfaces formed by dividing the workpiece to be inspected along its length direction through transverse and longitudinal sections via an axis, as described in this application embodiment.

[0038] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Transparent support plate; 21. Limiting groove; 3. Loading mechanism; 31. Conveyor frame; 32. Feeding belt; 4. Unloading mechanism; 41. Unloading frame; 42. Unloading belt; 5. Dimension detection mechanism; 51. Seventh camera; 52. Support sliding seat; 53. Lateral sliding assembly; 531. First lateral sliding seat; 532. First lateral slider; 54. Longitudinal sliding assembly; 541. First longitudinal slider; 542. Support plate; 543. Second locking bolt; 6. Surface defect detection mechanism; 61. Axial surface detection assembly; 611. First camera Camera; 612, Second camera; 613, Third camera; 614, Fourth camera; 62, Radial end face detection assembly; 621, Fifth camera; 622, Sixth camera; 7, Rejection mechanism; 71, Adjustment assembly; 711, Main frame; 712, Lateral support rod; 7121, Adjustment waist groove; 72, High-frequency solenoid valve; 8, Main adjustment frame; 81, Second lateral sliding seat; 82, Second lateral slider; 9, Sub-adjustment frame; 91, Longitudinal sliding block; 911, Fourth handle bolt; 912, Fixing seat; 9121, Annular waist groove; 10, Connecting seat; 1 01. Arc-shaped waist-shaped groove; 1011. Scale; 11. Cleaning mechanism; 112. Protective cover; 1121. Negative pressure pipeline; 113. Mounting bracket; 114. Drive motor; 115. Coupling; 116. Main shaft; 12. Adjustment assembly; 121. Main stop bar; 122. Adjusting plate; 13. Material passage; 14. Adjusting component; 141. First waist-shaped groove; 15. Limiting assembly; 151. First limiting baffle; 152. Second limiting baffle; 16. Discharge channel; 17. First adjustment module; 171. First slider; 172. First handle bolt; 173. First... 18. Connecting plate; 18. Second adjustment module; 181. Second slider; 182. Second handle bolt; 183. Second connecting plate; 1831. Cross fixing plate; 18311. Adjustment groove; 18312. Clearance position; 18313. First supplementary light; 18314. Second supplementary light; 19. Third adjustment module; 191. Third slider; 192. Third handle bolt; 193. Third connecting plate; 20. First adjustment seat; 201. Second adjustment seat; 202. Mounting plate; 203. Rotating shaft; 204. Collection assembly; 2041. Weighing device; 2042. Collection box. Detailed Implementation

[0039] It should be noted that the controller mentioned in this manual is a host computer, which consists of hardware, software, and monitoring configuration software. It enables interaction between electrical equipment and realizes the centralization and intelligence of the system. It is an existing controller, and its specific composition and working principle will not be described in detail here.

[0040] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0041] First, refer to Figure 10 When a workpiece is placed horizontally, the areas formed by the transverse cross-section along the length of the workpiece and the axis are defined as the first surface and the second surface, respectively, and the areas formed by the longitudinal cross-section along the length of the workpiece and the axis are defined as the third surface and the fourth surface, respectively. The total surface area of ​​the first surface, the second surface, the third surface and the fourth surface is 1.

[0042] Firstly, embodiments of this application disclose a workpiece appearance inspection device. (Refer to...) Figure 1 and Figure 2 A workpiece appearance inspection device includes a frame 1 and a transparent support plate 2 rotatably supported on the frame 1, as well as a loading mechanism 3 and a unloading mechanism 4 disposed on the frame 1 and connected to the transparent support plate 2. A size inspection mechanism 5, a surface defect inspection mechanism 6, and a rejection mechanism 7 are sequentially arranged on the frame 1 between the loading mechanism 3 and the unloading mechanism 4. The surface defect inspection mechanism 6 includes an axial surface inspection component 61 and a radial end face inspection component 62. The axial surface inspection component 61 includes a first camera 611, a second camera 612, a third camera 613, and a fourth camera 614. The first camera 611 and the second camera 612 are used to acquire images of the first and second surfaces of the workpiece, and the third camera 613 and the fourth camera 614 are used to acquire images of the third and fourth surfaces. The radial end face inspection component 62 includes a fifth camera 621 and a sixth camera 622. The fifth camera 621 and the sixth camera 622 acquire images of the end face of the workpiece.

[0043] Specifically, a servo motor (not shown in the figure) is installed on the frame 1. The output shaft of the servo motor is coaxially fixed with the transparent bearing plate 2, and the servo motor is electrically connected to the controller. When the output shaft of the servo motor is rotated by the controller, the transparent bearing plate 2 rotates synchronously with the output shaft of the servo motor. Taking advantage of the servo motor's ability to precisely control the rotation speed, rotation angle, and torque, the controller can monitor the position and speed of the workpiece on the transparent bearing plate 2 in real time. This is an existing drive component, and its specific composition and working principle will not be described in detail here.

[0044] Correspondingly, the transparent carrier plate 2 is made of optical glass, so that the light transmittance of the transparent carrier plate 2 reaches 97%, and the thickness is 4.5mm-5.5mm (SI unit, millimeter). When the transparent carrier plate 2 rotates along the frame 1, its rotation plane runout is <0.02mm, so that the workpiece can follow the transparent carrier plate 2 to move stably along the frame 1.

[0045] Meanwhile, a limiting groove 21 is formed on the surface of the transparent support plate 2 along the circumferential direction. The limiting groove 21 is formed by recessing the transparent support plate 2 along the thickness direction, and the cross-sectional shape of the limiting groove 21 is set in a V shape. When the workpiece is placed in the limiting groove 21, the limiting groove 21 supports the workpiece to meet the transportation needs of workpieces of different diameters. The limiting groove 21 limits the placement position of the workpiece along the transparent support plate 2 to avoid displacement or shaking of the workpiece during the movement of the transparent support plate 2.

[0046] Furthermore, the feeding mechanism 3 includes a conveyor frame 31 and a feeding belt 32 rotatably supported on the conveyor frame 31. The conveyor frame 31 is mounted on the frame 1 along the tangential direction of the rotation of the transparent support plate 2. An adjustment assembly 12 is mounted on the conveyor frame 31 above the feeding belt 32. The adjustment assembly 12 includes a main baffle 121 and an adjustment plate 122. The main baffle 121 and the adjustment plate 122 are mounted on the conveyor frame 31 in the same direction as the feeding belt 32, and a material passage 13 for the workpiece to pass through is formed between the main baffle 121 and the adjustment plate 122. The material passage 13 is connected to the limiting groove 21 of the transparent bearing plate 2 along the tangential direction of the rotation of the transparent bearing plate 2, so that the workpiece located in the material passage 13 can accurately fall into the limiting groove 21 when it is transported to the transparent bearing plate 2 by the feeding belt 32. The main baffle 121 is fixed to the frame 1 by bolts. At the same time, several adjusting parts 14 are installed in sequence along the length of the conveyor frame 31. The shape of the several adjusting parts 14 and the cooperation method with the conveyor frame 31 are the same. The following will describe one of the adjusting parts 14 in detail.

[0047] One end of the adjusting component 14 is fixedly connected to the conveyor frame 31 by bolts. The end of the adjusting component 14 away from the conveyor frame 31 is provided with a first waist-shaped groove 141. The adjusting plate 122 and the adjusting component 14 are fixedly connected by bolts through the first waist-shaped groove 141. Thus, when it is necessary to adjust the width of the material passage 13, it is only necessary to loosen the bolts located in the first waist-shaped groove 141 to adjust the width of the adjusting plate 122 and the main baffle 121 bracket to adapt to the transportation needs of workpieces of different diameters, which is simple to operate.

[0048] At the same time, refer to Figure 1 and Figure 4The feeding mechanism 4 includes a feeding frame 41 arranged on the frame 1 along the tangential direction when the transparent support plate 2 rotates, and a feeding belt 42 rotatably supported on the feeding frame 41. The feeding frame 41 and the conveyor frame 31 are arranged perpendicular to each other in spatial position. A limiting component 15 is installed on the feeding frame 41 located above the feeding belt 42. The limiting component 15 includes a first limiting baffle 151 and a second limiting baffle 152. The first limiting baffle 151 and the second limiting baffle 152 are installed on the feeding frame 41 along the conveying direction of the feeding belt 42. A feeding channel 16 is formed between the first limiting baffle 151 and the second limiting baffle 152. A clearance gap is provided between the end of the first limiting baffle 151 and the second limiting baffle 152 near the transparent support plate 2 and the feeding belt 42. The clearance gap is formed by the first limiting baffle 151 and the second limiting baffle 152 being recessed in the thickness direction towards the end of the transparent support plate 2. The transparent support plate 2 rotates along the clearance gap.

[0049] When the transparent support plate 2 carries the workpiece to the unloading belt 42, at the instant the workpiece comes into contact with the first limiting baffle 151 or the second limiting baffle 152, the workpiece's transport path on the limiting groove 21 is forcibly changed through the cooperation of the first limiting baffle 151 and the second limiting baffle 152. This forces the workpiece on the limiting groove 21 to separate from the transparent support plate 2. The workpiece separated along the transparent support plate 2 is subjected to inertial force and the thrust exerted by the workpiece adjacent to the current workpiece, so that the workpiece quickly reaches the unloading channel 16. This reduces the probability that the workpiece cannot reach the unloading channel 16 due to the excessive gap at the connection between the unloading channel 16 and the transparent support plate 2.

[0050] Both the feeding belt 32 and the unloading belt 42 are driven by independent servo motor drive modules (conventional drive components in the mechanical field, which will not be described in detail here), so that the feeding belt 32 can rotate stably along the conveyor frame 31 and the unloading belt 42 can rotate stably along the unloading frame 41.

[0051] Reference Figure 1 and Figure 3 The size detection mechanism 5 includes a seventh camera 51, a support sliding seat 52, a lateral sliding assembly 53 and a longitudinal sliding assembly 54. The lateral sliding assembly 53 includes a first lateral sliding seat 531, a first lateral slider 532 and a first locking bolt.

[0052] Specifically, the first transverse sliding seat 531 is fixed to the frame 1 near the material passage 13 of the transparent bearing plate 2 by bolts, and the first transverse sliding seat 531 is located on one side of the transparent bearing plate 2. The first transverse slider 532 slides and engages with the first transverse sliding seat 531. The first locking bolt is threaded through the first transverse slider 532 and abuts against the first transverse sliding seat 531. The support sliding seat 52 is fixed to the first transverse slider 532 by bolts. The spatial position relationship between the support sliding seat 52 and the first transverse slider 532 is perpendicular to each other.

[0053] Furthermore, the longitudinal sliding assembly 54 includes a first longitudinal slider 541, a support plate 542, and a second locking bolt 543. The first longitudinal slider 541 slides and engages with the support sliding seat 52 along the height direction of the support sliding seat 52. The second locking bolt 543 is threaded through the first longitudinal slider 541 and abuts against the support sliding seat 52. The support plate 542 is fixedly connected to the first longitudinal slider 541. The seventh camera 51 is mounted on the support plate 542, and the detection end of the seventh camera 51 faces the limiting groove 21 located on the transparent bearing plate 2.

[0054] Therefore, when it is necessary to adjust the relative position between the seventh camera 51 and the limiting groove 21, the first locking bolt is first loosened along the first transverse slider 532, so that the first transverse slider 532 can support the sliding seat 52 and slide along the first transverse sliding seat 531, thereby achieving the purpose of adjusting the horizontal distance between the seventh camera 51 and the transparent support plate 2.

[0055] Correspondingly, when it is necessary to adjust the distance between the seventh camera 51 and the limiting groove 21, the second locking bolt 543 can be loosened, so that the first longitudinal slider 541 can be adjusted along the height of the support slide seat 52 by supporting the seventh camera 51 via the support plate 542. By adjusting the transverse sliding assembly 53 and / or the longitudinal sliding assembly 54, the detection end of the seventh camera 51 can always face the limiting groove 21, so as to collect the workpiece image directly below the seventh camera 51.

[0056] Reference Figure 2 and Figure 5A main adjustment frame 8 is provided on the frame 1. The main adjustment frame 8 is set on the frame 1 along the rotation direction of the transparent support plate 2. The first camera 611 and the second camera 612 slide and cooperate with the main adjustment frame 8 along the height direction of the main adjustment frame 8. The detection end of the first camera 611 and the detection end of the second camera 612 are set opposite to each other. The third camera 613 and the fourth camera 614 are movably connected to the main adjustment frame 8 in the horizontal direction, and the detection ends of the third camera 613 and the fourth camera 614 are set opposite to each other. The detection ends of the first camera 611, the second camera 612, the third camera 613 and the fourth camera 614 all face the transparent support plate 2.

[0057] Specifically, a main adjustment frame 8 is provided on the frame 1, and the main adjustment frame 8 is located at the end of the support sliding seat 52 away from the material passage 13. A second transverse sliding seat 81, a second transverse slider 82, and a third locking bolt are installed on the end of the main adjustment frame 8 facing the frame 1. The second transverse sliding seat 81 is fixed to the frame 1 by bolts. The second transverse slider 82 slides and engages with the second transverse sliding seat 81. The main adjustment frame 8 and the second transverse slider 82 are fixedly connected, and the spatial positional relationship between the main adjustment frame 8 and the second transverse slider 82 is perpendicular to each other. The third locking bolt is threaded through the second transverse slider 82 and abuts against the second transverse sliding seat 81.

[0058] Furthermore, a first adjustment module 17, a second adjustment module 18, and a third adjustment module 19 are sequentially arranged along the height direction of the main adjustment frame 8. The first adjustment module 17 includes a first slider 171, a first handle bolt 172, and a first connecting plate 173; the second adjustment module 18 includes a second slider 181, a second handle bolt 182, and a second connecting plate 183; and the third adjustment module 19 includes a third slider 191, a third handle bolt 192, and a third connecting plate 193.

[0059] Among them, the first slider 171, the second slider 181 and the third slider 191 slide and cooperate with the main adjustment frame 8 in sequence along the height direction of the main adjustment frame 8.

[0060] Furthermore, the first handle bolt 172 is threaded through the first slider 171 and abuts against the main adjustment frame 8; the second handle bolt 182 is threaded through the second slider 181 and abuts against the main adjustment frame 8; the third handle bolt 192 is threaded through the third slider 191 and abuts against the main adjustment frame 8.

[0061] Furthermore, the first connecting plate 173 is fixedly connected to the first slider 171, the second connecting plate 183 is fixedly connected to the second slider 181, and the third connecting plate 193 is fixedly connected to the third slider 191.

[0062] Reference Figure 1 and Figure 2A clearance groove is provided through the surface of the frame 1 located below the first connecting plate 173 along the thickness direction to improve the space utilization between the frame 1 and the transparent support plate 2. The second camera 612 is installed on the first connecting plate 173 with the detection end of the second camera 612 facing the transparent support plate 2. When the first slider 171 carries the first connecting plate 173 on which the second camera 612 is installed and slides along the height direction of the main adjustment frame 8, the first connecting plate 173 carries the second camera 612 and moves up and down synchronously along the main adjustment frame 8 along the clearance groove, so as to achieve the purpose of adjusting the distance between the detection end of the second camera 612 and the transparent support plate 2.

[0063] Meanwhile, the first camera 611 is mounted on the third connecting plate 193, with the detection end of the first camera 611 facing the transparent carrier plate 2. When the first camera 611 is mounted on the third connecting plate 193, the detection end of the first camera 611 is directly opposite the detection end of the second camera 612. When the workpiece reaches below the detection end of the first camera 611, the first camera 611 and the second camera 612 work synchronously. At this time, the first camera 611 captures images of the first surface of the workpiece, and the second camera 612 captures images of the second surface of the workpiece.

[0064] Correspondingly, refer to Figure 2 A cross-shaped fixing plate 1831 is installed on the surface of the second connecting plate 183. The cross-shaped fixing plate 1831 has adjustment grooves 18311 extending along the center line of the length direction to the edges of both ends of the cross-shaped fixing plate 1831 with the center line of the length direction as the axis of symmetry. A first adjustment seat 20 and a second adjustment seat 201 are respectively installed at both ends of the cross-shaped fixing plate 1831 along the length direction. The first adjustment seat 20 is fixed to the cross-shaped fixing plate 1831 with bolts through the adjustment grooves 18311.

[0065] Meanwhile, the second adjustment seat 201 is fixed to the cross fixing plate 1831 with bolts through the adjustment groove 18311 away from the first adjustment seat 20. The third camera 613 is installed on the first adjustment seat 20, and the fourth camera 614 is installed on the second adjustment seat 201. The third camera 613 and the fourth camera 614 are symmetrically arranged about the center line of the cross fixing plate 1831 along the length direction. The detection end of the third camera 613 and the detection end of the fourth camera 614 both face the limiting groove 21.

[0066] In addition, a clearance 18312 is provided through the surface of the cross-shaped fixing plate 1831 along the geometric center. The detection end of the first camera 611 is directly opposite the clearance 18312. The diameter of the clearance 18312 is larger than the diameter of the first camera 611, so as to reduce the probability of the cross-shaped fixing plate 1831 affecting the operation of the first camera 611 when the detection end of the first camera 611 is collecting data on the first surface.

[0067] Therefore, when the workpiece reaches directly below the clearance position 18312, the first camera 611, the second camera 612, the third camera 613, and the fourth camera 614 work synchronously, enabling the simultaneous acquisition of all images of the first, second, third, and fourth surfaces of the workpiece along the axial direction, which is beneficial to improving the efficiency of image acquisition along the axial surface of the workpiece.

[0068] Correspondingly, the cross-shaped fixing plate 1831 is symmetrically equipped with a first supplementary light 18313 and a second supplementary light 18314 along the center line to both ends of the width direction. Both the first supplementary light 18313 and the second supplementary light 18314 are LED light sources (Light Emitting Diodes). When the workpiece reaches between the first supplementary light 18313 and the second supplementary light 18314, the brightness of the workpiece surface is improved by the cooperation of the first supplementary light 18313 and the second supplementary light 18314. This reduces the probability of light spots or shadows in the image acquired during image acquisition, thereby preventing interference or misjudgment by the controller when processing the acquired image.

[0069] Reference Figure 1 and Figure 5 Sub-adjustment frames 9 are provided on the racks 1 located on both sides of the main adjustment frame 8. The fifth camera 621 and the sixth camera 622 are respectively installed on the sub-adjustment frames 9 located on both sides of the main adjustment frame 8.

[0070] Specifically, one set of sub-adjustment frames 9 is located between the support sliding seat 52 and the main adjustment frame 8, and another set of sub-adjustment frames 9 is located on the frame 1 on the side of the support sliding seat 52 away from the seventh camera 51. The fifth camera 621 is installed on the sub-adjustment frame 9 located between the main adjustment frame 8 and the support sliding seat 52, and the sixth camera 622 is installed on the sub-adjustment frame 9 on the side of the main adjustment frame 8 away from the seventh camera 51. Since the components of the two sets of sub-adjustment frames 9 and their cooperation with the frame 1 are the same, the sub-adjustment frame 9 located between the seventh camera 51 and the main adjustment frame 8 will be described in detail below.

[0071] The sub-adjustment frame 9 and the frame 1 are arranged perpendicularly to each other in terms of spatial position. The sub-adjustment frame 9 is provided with a longitudinal sliding block 91. The longitudinal sliding block 91 slides and cooperates with the sub-adjustment frame 9 along the height direction of the sub-adjustment frame 9. The longitudinal sliding block 91 is threadedly connected with a fourth handle bolt 911. The fourth handle bolt 911 is threaded through the longitudinal sliding block 91 and abuts against the sub-adjustment frame 9.

[0072] Furthermore, a fixed seat 912 is mounted on the longitudinal sliding block 91, and a mounting plate 202 is rotatably connected to the fixed seat 912. A rotating shaft 203 is mounted on the fixed seat 912, and a rotating hole is formed through the mounting plate 202 along its thickness direction. The diameter of the rotating hole and the outer diameter of the rotating shaft 203 are in a clearance fit, allowing the mounting plate 202 to rotate along the rotating shaft 203 via the rotating hole.

[0073] Meanwhile, three fixing holes are evenly distributed circumferentially along the surface of the fixing seat 912 with the axis of the rotating shaft 203 as the reference. Correspondingly, an annular waist-shaped groove 9121 is formed circumferentially along the surface of the fixing seat 912 with the rotating hole as the center. The center distance between the center point of the annular waist-shaped groove 9121 and the center of the rotating hole is the same as the center distance between the center of the fixing hole and the axis of the rotating shaft 203. When the mounting plate 202 is installed on the fixing seat 912, the fixing holes correspond to the annular waist-shaped groove 9121, and the mounting plate 202 can be fixed on the fixing seat 912 with bolts. When it is necessary to adjust the angle between the mounting plate 202 and the fixing seat 912, simply loosen the fourth handle bolt 911 and drive the mounting plate 202 to rotate along the fixing seat 912. After the adjustment is completed, the fourth handle bolt 911 can be used to fix it again.

[0074] Correspondingly, refer to Figure 5 A connecting seat 10 is movably connected to the sub-adjustment frame 9. The connecting seat 10 has bolt holes, and the fifth camera 621 is fixed to the connecting seat 10 via bolts through these holes. The detection end of the fifth camera 621 faces the limiting groove 21 on the transparent support plate 2. The connecting seat 10 has an arc-shaped waist-shaped groove 101 with the center point of the bolt holes as a reference, and a scale 1011 is provided on the arc-shaped waist-shaped groove 101. The connecting seat 10 is fixedly connected to the fixing plate by bolts, and the spatial positional relationship between the connecting seat 10 and the fixing plate is perpendicular to each other. Therefore, when it is necessary to adjust the angle between the fifth camera 621 and the transparent support plate 2, the bolts are loosened, and the fifth camera 621 is rotated along the connecting seat 10. The scale 1011 on the arc-shaped waist-shaped groove 101 allows real-time monitoring of the included angle between the fifth camera 621 and the transparent support plate 2, ensuring that the detection end of the fifth camera 621 always faces the radial end face of the workpiece located on the limiting groove 21.

[0075] Therefore, when acquiring images of the two radial end faces of the workpiece, the fifth camera 621 first acquires an image of one radial end face. When the workpiece reaches the sixth camera 622, the sixth camera 622 acquires an image of the other radial end face of the workpiece. During this process, the images of the two radial end faces of the workpiece are acquired in a distributed manner, so that the detection ends of the fifth camera 621 and the sixth camera 622 are in a parallel spatial relationship with the radial end faces of the workpiece. This reduces the probability of distortion or warping of the acquired images due to the deviation of the angle between the detection ends of the fifth camera 621 and / or the sixth camera 622 and the radial end faces of the workpiece.

[0076] Therefore, it should also be noted that the fifth camera 621 and the sixth camera 622 mentioned in this embodiment are both 5-megapixel area scan cameras with a frame rate ≥ 50fps and a target area ≥ The camera has a single pixel size ≤3.45μm, a lens field of view of 10mm*10mm, and a depth of field >2mm, to improve the accuracy and completeness of acquiring images of the two radial end faces of the workpiece. Meanwhile, the first camera 611, second camera 612, third camera 613, and fourth camera 614 have TDI (Time Delay & Integration) line scanning function, a camera resolution of 4096*64, a maximum line frequency of 125kHz, a pixel size ≤7μm, a lens field of view of 12mm*12mm, and a depth of field >1mm. This is existing technology, and its specific composition and working principle will not be elaborated here.

[0077] Reference Figure 1 and Figure 7 The rejection mechanism 7 includes an adjustment component 71 and a high-frequency solenoid valve 72. The adjustment component 71 is mounted on the frame 1 between the sixth camera 622 and the unloading mechanism 4. The high-frequency solenoid valve 72 is mounted on the adjustment component 71, and the output end of the high-frequency solenoid valve 72 faces the transparent support plate 2.

[0078] Specifically, the adjustment assembly 71 includes a main frame 711 and a transverse support rod 712. The main frame 711 is fixed to the frame 1 by bolts. The main frame 711 and the frame 1 are arranged perpendicular to each other in spatial position. Meanwhile, the transverse support rod 712 has an adjustment slot 7121 along its length. The transverse support rod 712 is fixed to the main frame 711 by bolts through the adjustment slot 7121. When the bolts are loosened, the transverse support rod 712 can be adjusted along the relative position of the main frame 711 through the adjustment slot 7121.

[0079] Furthermore, the high-frequency solenoid valve 72 is bolted to one end of the transverse support rod 712 facing the transparent support plate 2, and the output end of the high-frequency solenoid valve 72 faces the limiting groove 21. Adjusting the relative position of the transverse support rod 712 and the main frame 711 allows for adjustment of the relative position between the high-frequency solenoid valve 72 and the limiting groove 21. The high-frequency solenoid valve 72 is externally connected to a compressed air source (e.g., an air compressor) and is electrically connected to a controller. The controller controls the operating state of the high-frequency solenoid valve 72. When the high-frequency solenoid valve 72 is turned on, compressed air is output along its output end, thereby removing the workpiece located in the limiting groove 21 along the transparent support plate 2.

[0080] Meanwhile, a collection assembly 204 is also installed on the frame 1 near the output end of the high-frequency solenoid valve 72. The collection assembly 204 includes a weighing device 2041 and a collection box 2042. The weighing device 2041 can be a weighing sensor. In this embodiment, preferably, the weighing device 2041 is an electronic scale. The electronic scale is electrically connected to the controller. The collection box 2042 is placed on the weighing device 2041. The workpieces rejected along the transparent support plate 2 are collected through the collection box 2042. The total weight of the collection box 2042 and the workpieces located in the collection box 2042 is detected by the weighing device 2041. When the detection value of the weighing device 2041 exceeds the set threshold, it indicates that the total amount of workpieces that can be collected in the collection box 2042 has reached the maximum value. At this time, the controller will issue an alarm so that the workpieces located in the collection box 2042 can be processed in time.

[0081] On the other hand, refer to Figure 1 and Figure 6 It also includes a cleaning mechanism 11, which is mounted on the frame 1 near the unloading mechanism 4 and located between the unloading mechanism 4 and the loading mechanism 3. The cleaning mechanism 11 includes a cleaning component (not shown in the figure) and a protective cover 112. The cleaning component is rotatably supported inside the protective cover 112. The cleaning component can be a cleaning brush or a silicone soft brush to facilitate cleaning the surface of the transparent support plate 2. The protective cover 112 is mounted above the transparent support plate 2 and is connected to a negative pressure pipeline 1121. The negative pressure pipeline 1121 is externally connected to a negative pressure generator. A rotation gap is provided between the surface of the protective cover 112 facing the transparent support plate 2 and the surface of the transparent support plate 2 facing the protective cover 112.

[0082] Specifically, the cleaning mechanism 11 also includes a mounting bracket 113, a drive motor 114, a coupling 115, and a main shaft 116. The drive motor 114 is mounted on the mounting bracket 113 to improve the stability of the drive motor 114 during operation. The drive shaft of the coupling 115 is coaxially fixed with the output shaft of the drive motor 114, and the driven shaft of the coupling 115 is coaxially fixed with the main shaft 116. The drive shaft and driven shaft of the coupling 115 are locked together.

[0083] Furthermore, the outer contour of the protective cover 112 is cylindrical and is fixedly connected to the mounting bracket 113. The interior of the protective cover 112 is hollow to form a space for the cleaning component to rotate along the protective cover 112.

[0084] During installation, the protective cover 112 is first installed on the mounting bracket 113. Then, the cleaning component is inserted into the protective cover 112 and fixed coaxially with the main shaft 116 away from the driven shaft of the coupling 115. When the drive motor 114 is working, the output shaft of the drive motor 114 drives the drive shaft of the coupling 115 to rotate synchronously with the output shaft of the drive motor 114, so as to drive the driven bearing main shaft 116, which is locked with the drive shaft of the coupling 115, to rotate along the mounting bracket 113. At this time, the cleaning component and the transparent bearing plate 2 are in abutting state, so as to achieve the purpose of cleaning the surface of the transparent bearing plate 2.

[0085] Meanwhile, a rotation gap is provided between the surface of the protective cover 112 facing the transparent carrier plate 2 and the surface of the transparent carrier plate 2 facing the protective cover 112. This rotation gap is between 0.25mm and 1.00mm to avoid friction between the protective cover 112 and the transparent carrier plate 2 when the transparent carrier plate 2 rotates along the frame 1.

[0086] Therefore, when the output shaft of the drive motor 114 rotates, it will drive the cleaning component to rotate along the surface of the transparent support plate 2, thereby achieving the purpose of cleaning the surface of the transparent support plate 2. After cleaning, the particles move randomly along the inside of the protective cover 112, and the inside of the protective cover 112 is in a negative pressure state through the negative pressure pipe 1121. The particles are subjected to negative pressure and will be drawn out along the negative pressure pipe 1121, thereby achieving the purpose of cleaning the particles on the surface of the transparent support plate 2, reducing the probability of the operation of the size detection mechanism 5 and the surface defect detection mechanism 6 being affected by the excessive amount of particles accumulating on the surface of the transparent support plate 2.

[0087] Secondly, embodiments of this application also disclose a detection method for the workpiece appearance inspection equipment, referring to... Figure 8 and Figure 9 This includes the following steps:

[0088] S1. The workpiece is fed onto the transparent support plate 2 that rotates along the frame 1 by the feeding mechanism 3; and the movement speed of the feeding belt 32 and the unloading belt 42 is collected by the controller.

[0089] S2. When the workpiece reaches the size detection mechanism 5, the size of the workpiece is detected by the size detection mechanism 5, the current position information and motion information of the workpiece are recorded and sent to the controller. The first point is defined when the workpiece reaches the position directly below the seventh camera 51, and the second point is defined when the workpiece reaches the radial end face of the workpiece collected by the fifth camera 621. The controller calculates the time when the workpiece reaches the second point based on the position information and motion information of the workpiece and the time when the workpiece reaches the first point, and sends the time when the workpiece reaches the second point to the fifth camera 621.

[0090] When the workpiece reaches the first point, the workpiece surface image is captured by the seventh camera 51 and sent to the controller. The controller then determines whether the diameter and length of the current workpiece are within the set value range.

[0091] S3. When the workpiece reaches the fifth camera 621, the fifth camera 621 acquires the end face image of the workpiece and sends it to the controller. The position where the workpiece reaches the first camera 611 directly after the radial end face image is acquired by the fifth camera 621 is defined as the third position. The controller calculates the time when the workpiece reaches the third position based on the time when the workpiece reaches the second position and the rotation information of the transparent bearing plate 2, and sends it to the controller.

[0092] S4. When the workpiece reaches below the detection end of the first camera 611, the first camera 611 and the second camera 612 acquire images of the first and second surfaces of the workpiece. At the same time, the third camera 613 and the fourth camera 614 acquire images of the third and fourth surfaces of the workpiece. The acquired images of the first, second, third, and fourth surfaces are synchronously sent to the controller. The position of the workpiece when it reaches the sixth camera 622 is defined as the fourth point, and the position of the workpiece when it reaches the high-frequency solenoid valve 72 is defined as the fifth point. The time for the workpiece to reach the fourth point is calculated and sent to the sixth camera 622. The time for the workpiece to reach the fifth point is also calculated and sent to the high-frequency solenoid valve 72.

[0093] S5. When the workpiece reaches the sixth camera 622, the image of the other end face of the workpiece after step S3 is acquired through the sixth camera 622, and the acquired image is sent to the controller.

[0094] S6. The images acquired in steps S2-S5 are processed by the controller to determine whether the workpiece is qualified.

[0095] If the current workpiece is in a qualified state, when the workpiece reaches the fifth position, the controller controls the high-frequency solenoid valve 72 to stop working, so that the workpiece can continue to follow the transparent carrier plate 2 until it reaches the unloading channel 16, and the qualified workpiece is transported by the unloading belt 42.

[0096] If the current workpiece is in an unqualified state, when the workpiece reaches the fifth position, the controller controls the high-frequency solenoid valve 72 to be turned on, so that the output end of the high-frequency solenoid valve 72 outputs compressed air to remove the current workpiece along the transparent carrier plate 2 into the collection box 2042.

[0097] In another embodiment, if a defect exists at any point on the axial or radial surface of the workpiece, the workpiece is considered unqualified.

[0098] For example, when a workpiece reaches the first point, the image is captured by the seventh camera 51 and sent to the controller. The controller processes the image captured by the seventh camera 51 and determines whether there is a defect on the end face of the workpiece. If there is a defect, the controller will directly send the time for the workpiece to reach the fifth point to the high-frequency solenoid valve 72. Subsequently, when the workpiece passes through the second, third and fourth points, the fifth camera 621, the first camera 611, the second camera 612, the third camera 613, the fourth camera 614 and the sixth camera 622 will no longer capture images of the workpiece surface, and when the workpiece reaches the fifth point, it will be directly rejected by the high-frequency solenoid valve 72.

[0099] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A workpiece appearance inspection device, comprising a frame (1) and a transparent support plate (2) rotatably supported on the frame (1), and a loading mechanism (3) and a unloading mechanism (4) disposed on the frame (1) and connected to the transparent support plate (2), characterized in that: A size detection mechanism (5), a surface defect detection mechanism (6), and a rejection mechanism (7) are sequentially arranged on the frame (1) located between the loading mechanism (3) and the unloading mechanism (4). The surface defect detection mechanism (6) includes an axial surface detection component (61) and a radial end face detection component (62). The axial surface detection component (61) includes a first camera (611), a second camera (612), a third camera (613), and a fourth camera (614). The first camera (611) and the second camera (612) are used to acquire images of the first and second surfaces of the workpiece. The third camera (613) and the fourth camera (614) are used to acquire images of the third and fourth surfaces of the workpiece. The radial end face detection component (62) includes a fifth camera (621) and a sixth camera (622). The fifth camera (621) and the sixth camera (622) acquire images of the end face of the workpiece.

2. The workpiece appearance inspection device according to claim 1, characterized in that: The transparent carrier plate (2) has a circumferential groove (21) on its surface.

3. The workpiece appearance inspection device according to claim 2, characterized in that: A main adjustment frame (8) is provided on the frame (1). The first camera (611) and the second camera (612) slide and cooperate with the main adjustment frame (8) along the height direction of the main adjustment frame (8). The detection end of the first camera (611) and the detection end of the second camera (612) are set opposite to each other. The third camera (613) and the fourth camera (614) are movably connected to the main adjustment frame (8) in the horizontal direction. The detection ends of the third camera (613) and the fourth camera (614) are set opposite to each other. The detection ends of the first camera (611), the second camera (612), the third camera (613) and the fourth camera (614) all face the transparent support plate (2).

4. The workpiece appearance inspection device according to claim 3, characterized in that: The transparent carrier plate (2) is made of optical glass.

5. The workpiece appearance inspection device according to claim 3, characterized in that: Sub-adjustment frames (9) are provided on the racks (1) located on both sides of the main adjustment frame (8). The fifth camera (621) and the sixth camera (622) are respectively installed on the sub-adjustment frames (9) located on both sides of the main adjustment frame (8).

6. The workpiece appearance inspection device according to claim 1, characterized in that: The rejection mechanism (7) includes an adjustment component (71) and a high-frequency solenoid valve (72). The adjustment component (71) is disposed on the frame (1) between the sixth camera (622) and the unloading mechanism (4). The high-frequency solenoid valve (72) is disposed on the adjustment component (71), and the output end of the high-frequency solenoid valve (72) faces the transparent carrier plate (2).

7. The workpiece appearance inspection device according to claim 5, characterized in that: The sub-adjustment frame (9) is movably connected to a connecting seat (10), and the connecting seat (10) is provided with bolt holes. The fifth camera (621) is fixed to the connecting seat (10) with bolts through the bolt holes. The connecting seat (10) has an arc-shaped waist-shaped groove (101) with the center point of the bolt hole as the base point. The arc-shaped waist-shaped groove (101) is provided with a scale (1011).

8. The workpiece appearance inspection device according to claim 1, characterized in that: It also includes a cleaning mechanism (11), which is disposed on the frame (1) near the unloading mechanism (4) and is located between the unloading mechanism (4) and the loading mechanism (3). The cleaning mechanism (11) includes a cleaning component (111) and a protective cover (112). The cleaning component (111) is rotatably supported inside the protective cover (112). The protective cover (112) is mounted above the transparent support plate (2). A negative pressure pipeline (1121) is connected to the protective cover (112), and a rotation gap is provided between the surface of the protective cover (112) facing the transparent support plate (2) and the surface of the transparent support plate (2) facing the protective cover (112).

9. A method for inspecting the appearance of a workpiece, applied to the workpiece appearance inspection equipment according to any one of claims 1-8, characterized in that, Includes the following steps: S1. The workpiece is fed onto the transparent support plate (2) that rotates along the frame (1) by the feeding mechanism (3); S2. When the workpiece arrives at the dimension detection mechanism (5), the dimension of the workpiece is detected by the dimension detection mechanism (5), the current position information and motion information of the workpiece are recorded and sent to the controller; S3. When the workpiece reaches the fifth camera (621), the fifth camera (621) acquires an image of the end face of the workpiece and sends it to the controller; S4. When the workpiece reaches below the detection end of the first camera (611), the first camera (611) and the second camera (612) acquire images of the first and second surfaces of the workpiece. At the same time, the third camera (613) and the fourth camera (614) acquire images of the third and fourth surfaces of the workpiece. The acquired images of the first surface, the second surface, the third surface, and the fourth surface are simultaneously sent to the controller. S5. When the workpiece reaches the sixth camera (622), the image of the other end face of the workpiece after step S3 is acquired by the sixth camera (622), and the acquired image is sent to the controller. S6. The controller processes the images acquired in steps S2-S5 to determine whether the workpiece is qualified.

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