Metal strip on-line visual inspection device

Abstract

The utility model provides a metal strip on-line visual inspection device which comprises a rack, a motion assembly, a line scanning camera assembly and a light source, the line scanning camera assembly can move left and right along the rack through the motion assembly, and the line scanning camera assembly comprises a mounting plate, a position adjusting mechanism and a line scanning camera, the line scanning camera is arranged on the mounting plate through the position adjusting mechanism, and the position adjusting mechanism is used for adjusting the up-down position, the left-right position and the pitching angle of the line scanning camera. According to the utility model, the line scanning camera assembly is adopted to detect the metal strip in real time, defects on the surface of the metal strip can be quickly and accurately found, and compared with a traditional manual detection mode, the device not only greatly improves the detection precision and efficiency, but also can timely adjust the previous procedure according to the detection result, thereby reducing the labor intensity of workers. Therefore, the quality and the qualified rate of products are improved.

Description

Technical Field

[0001] The utility model relates to the field of visual inspection of metal products, in particular to an on-line visual inspection device for metal strip. Background Art

[0002] During the production process of metal strip, various defects may appear on the metal surface, such as impurities, fibers, different colors, pits, scratches, etc. In mass continuous production, manual inspection of defects will cause visual fatigue, as well as problems such as inconsistent inspection standards and difficulty in detecting some defects. In terms of automatic inspection of metal strip, the line array camera can cover a wider field of view through its unique long-line array sensor, and realize non-contact continuous inspection of the moving metal strip. Compared with the traditional contact inspection, this method has higher real-time performance and reliability, and avoids the surface scratching problem that may be brought by the traditional contact inspection.

[0003] The effect of the line array camera in the inspection of metal strip depends to a great extent on the selection and configuration of the light source. An inappropriate light source may cause reflection or shadow in the image, thus affecting the accuracy of defect detection. For example, the reflection on the metal surface may cover up fine scratches or spots. In addition, the existing structure design of metal strip inspection equipment is relatively complex and not easy to install and maintain.

[0004] Therefore, it is necessary to design an on-line visual inspection device for metal strip to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an on-line visual inspection device for metal strip with high inspection efficiency and accuracy and convenient installation and maintenance.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: an on-line visual inspection device for metal strip, which comprises a frame, a motion component, a line scan camera component and a light source. The line scan camera component can move left and right along the frame through the motion component. The line scan camera component comprises a mounting plate, a position adjusting mechanism and a line scan camera. The line scan camera is arranged on the mounting plate through the position adjusting mechanism. The position adjusting mechanism is used to adjust the up and down position, left and right position and pitching angle of the line scan camera.

[0007] As a further improved technical scheme of the utility model, the motion component comprises a slider arranged on the mounting plate and a slide rail arranged on the frame.

[0008] As a further improved technical scheme of the utility model, a limiting plate is arranged on the mounting plate, and a baffle plate matched with the limiting plate is arranged on the frame. When the line scan camera component moves to a preset position, the limiting plate abuts against the baffle plate.

[0009] As a further improved technical solution of the present utility model, the motion assembly further includes a quick-lock member, the quick-lock member includes a handle indexing pin provided on the mounting plate, a lock block provided on the frame, and a pulley provided on the lock block. An opening is provided on the lock block to cooperate with the handle indexing pin to lock or unlock the line scan camera assembly and the frame. The handle indexing pin and the limit plate are respectively provided at both ends of the mounting plate.

[0010] As a further improved technical solution of the present utility model, the number of the line scan cameras is two, and the viewing ranges of the two line scan cameras partially overlap in the left-right direction, and the overlapping width is 30 - 50 mm.

[0011] As a further improved technical solution of the present utility model, the height of the line scan camera from the metal strip is 375 ± 10 mm, the height of the light source from the metal strip is 320 ± 10 mm, and the light source is a white cross-line light source.

[0012] As a further improved technical solution of the present utility model, the inclination angle of the central axis of the line scan camera relative to the vertical direction is 10 ± 5°, and the included angle between the incident direction of the light source and the vertical direction is 10 ± 5°.

[0013] As a further improved technical solution of the present utility model, the number of the line scan camera assemblies is two, and the two line scan camera assemblies are arranged in a horizontal row on the frame.

[0014] As a further improved technical solution of the present utility model, it further includes a color difference detection assembly, and the color difference detection assembly is provided on the side of the frame opposite to the line scan camera assembly.

[0015] As a further improved technical solution of the present utility model, the color difference detection assembly includes a color difference camera, a color difference light source, and a motion mechanism, and the motion mechanism drives the color difference camera and the color difference light source to move left and right along the frame.

[0016] As can be seen from the above technical solutions, the present utility model uses a line scan camera assembly to perform real-time detection on a metal strip, and can quickly and accurately detect defects on the surface of the metal strip. Compared with the traditional manual detection method, this device not only greatly improves the detection accuracy and efficiency, but also can adjust the previous process in a timely manner according to the detection results, thereby improving the product quality and qualification rate. In addition, by movably arranging the line scan camera assembly on the frame through the motion assembly, the detection range can be flexibly adjusted to adapt to metal strips of different widths; the position adjustment mechanism of the line scan camera can adjust the up-down position, left-right position, and pitch angle of the camera, further increasing the flexibility of the detection range. Description of the Drawings

[0017] Figure 1 Stereogram of an on-line visual inspection device for metal strip according to an embodiment of the present utility model.

[0018] Figure 2 is Figure 1 Another stereogram of the on-line visual inspection device for metal strip in

[0019] Figure 3 Schematic diagram of the cooperation relationship among the line scan camera assembly, the motion assembly and the frame.

[0020] Figure 4 is Figure 3 Partial enlarged view of the quick locking member in

[0021] Figure 5 Partial side view of the on-line visual inspection device for metal strip in Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0023] Please refer Figures 1 to 3 As shown, the present utility model provides an on-line visual inspection device for metal strip, which includes a frame 10, a first line scan camera assembly 20, a second line scan camera assembly 30, a light source 40, a color difference detection assembly 50 and a motion assembly 60.

[0024] The first line scan camera assembly 20 and the second line scan camera assembly 30 are arranged horizontally in a row on the frame 10. Please refer Figure 3 As shown, the first line scan camera assembly 20 includes a mounting plate 23, a position adjusting mechanism 22 and a line scan camera 21. The line scan camera 21 is arranged on the mounting plate 23 through the position adjusting mechanism 22. Specifically, the position adjusting mechanism 22 includes a vertically-displaceable plate 221, a horizontally-displaceable plate 222 and a pitch adjusting member 223 arranged in sequence, which are respectively used for adjusting the vertical position, the horizontal position and the pitch angle of the line scan camera 21. The pitch adjusting member 223 includes a fixed plate and a movable plate that can rotate relative to the fixed plate. The line scan camera 21 is fixed on the movable plate. An angle scale is provided on one side of the movable plate facing the fixed plate, and a pointer is provided on the fixed plate. The angle scale cooperates with the pointer so that the pitch angle of the line scan camera can be quantitatively adjusted. The number of the line scan cameras 21 is preferably 2. The field of view ranges of the two line scan cameras 21 partially overlap in the horizontal direction, and the overlapping width is 30-50 mm. The height of the line scan camera 21 from the metal strip is 375±10 mm, and the inclination angle of the central axis of the line scan camera 21 relative to the vertical direction is 10±5°, that is: the included angle a between the central axis of the line scan camera 21 and the surface of the metal strip is 80±5° ( Figure 5 as shown).

[0025] The first line scan camera assembly 20 moves left and right along the frame 10 through the motion assembly 60. The motion assembly 60 includes a slide rail 61, a slider 62, a stopper and a quick lock 65. The slider 62 is disposed on the mounting plate 23, the slide rail 61 is disposed on the frame 10, and the slider 62 moves along the slide rail 61. The stopper includes a stopper plate 63 disposed on the mounting plate 23 and a baffle plate 64 disposed on the frame 10 and matched with the stopper plate 63. When the first line scan camera assembly 20 moves to a preset position, the stopper plate 63 abuts against the baffle plate 64.

[0026] Please also refer to Figure 4 As shown, the quick lock member 65 includes a handle indexing pin 651 disposed on the mounting plate 23, a locking block 652 disposed on the frame 10, and a pulley 653 disposed on the locking block 652. The locking block 652 is provided with an opening that cooperates with the handle indexing pin 651 to lock or unlock the first line scan camera assembly 20 and the frame 10. The handle indexing pin 651 and the limit plate 63 are disposed at both ends of the mounting plate 23.

[0027] The structure of the second line scan camera assembly 30 is the same as that of the first line scan camera assembly 20, and the number of the motion assemblies is 2. The second line scan camera assembly 30 is movably arranged on the frame 10 through another motion assembly, and its installation method is the same as the installation method of the first line scan camera assembly 20 and the motion assembly 60. It should be noted that the handle indexing pins 651 of the two motion assemblies are respectively arranged at the ends of the two mounting plates that are away from each other, that is, the outer sides of the first line scan camera assembly 20 and the second line scan camera assembly 30, and the two limit plates are respectively arranged at the ends of the two mounting plates that are close to each other, that is, the inner sides of the first line scan camera assembly 20 and the second line scan camera assembly 30.

[0028] The light source 40 is preferably a white cross-line light source, and its length covers the entire width of the product. The white cross-line light source achieves cross-irradiation on both sides through a special optical design, so that the light can form a specific light and dark staggered pattern on the surface of the product, which helps to highlight the contour and concave-convex defects on the surface of the object. For a glossy metal surface, the white cross-line light source can clearly identify scratches and tiny surface defects. The angle between the incident direction of the light source 40 and the vertical direction is 10±5°, that is, the angle b between the incident direction of the light source 40 and the surface of the metal strip is 80±5°. The height of the light source from the metal strip is 320±10mm. The surface of the metal strip is smooth, and the bright field method can be used to capture impurities, fibers, discoloration, pits, scratches and other defects on the surface of the product.

[0029] The color difference detection assembly 50 is disposed on the side of the frame 10 opposite to the line scan camera assemblies 20 and 30. The color difference detection assembly 50 includes a color difference camera 51, a color difference light source 52 and a motion mechanism 53. The motion mechanism 53 drives the color difference camera 51 and the color difference light source 52 to move left and right along the frame 10.

[0030] Spatial relative position terms such as "upper", "lower", "front", "rear", "left", "right", etc. used in this text are for the purpose of facilitating description of the relationship of one feature relative to another as shown in the accompanying drawings. It can be understood that depending on the different placement positions of the product, the spatial relative position terms may be intended to include different orientations other than those shown in the figures, and should not be construed as a limitation on the claims.

[0031] In addition, the above embodiments are only used to illustrate the present utility model and do not limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although this specification has described the present utility model in detail with reference to the above embodiments, those skilled in the art should understand that those skilled in the art can still modify or equivalently replace the present utility model, and all technical solutions and their improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. An online visual inspection device for metal strips, characterized in that: The invention comprises a frame, a motion component, a line scan camera component and a light source. The line scan camera component can move left and right along the frame through the motion component. The line scan camera component comprises a mounting plate, a position adjustment mechanism and a line scan camera. The line scan camera is arranged on the mounting plate through the position adjustment mechanism. The position adjustment mechanism is used to adjust the up and down position, left and right position and pitch angle of the line scan camera.

2. The on-line visual inspection device for metal strip according to claim 1, characterized in that: The motion assembly comprises a sliding block arranged on the mounting plate and a sliding rail arranged on the frame.

3. The on-line visual inspection device for metal strip according to claim 1, characterized in that: A limit plate is disposed on the mounting plate, and a baffle matched with the limit plate is disposed on the frame. When the line scan camera assembly moves to a preset position, the limit plate abuts against the baffle.

4. The on-line visual inspection device for metal strip according to claim 3, characterized in that: The motion assembly also includes a quick-locking component, which includes a handle indexing pin arranged on the mounting plate, a locking block arranged on the frame, and a pulley arranged on the locking block. The locking block is provided with an opening that cooperates with the handle indexing pin to lock or unlock the line scan camera assembly and the frame. The handle indexing pin and the limit plate are respectively arranged at both ends of the mounting plate.

5. The on-line visual inspection device for metal strips according to claim 1, characterized in that: The number of the line scan cameras is two, and the field of view of the two line scan cameras partially overlaps in the left-right direction, with an overlapping width of 30-50 mm.

6. The on-line visual inspection device for metal strip according to claim 1, characterized in that: The height of the line scan camera from the metal strip is 375±10 mm, the height of the light source from the metal strip is 320±10 mm, and the light source is a white cross line light source.

7. The on-line visual inspection device for metal strips according to claim 1, characterized in that: The inclination angle of the central axis of the line scan camera relative to the vertical direction is 10±5°, and the angle between the incident direction of the light source and the vertical direction is 10±5°.

8. The metal strip online visual inspection device according to claim 1, characterized in that: The number of the line scan camera assemblies is two, and the two line scan camera assemblies are arranged in a horizontal row on the frame.

9. The on-line visual inspection device for metal strips according to claim 1, characterized in that: It also includes a color difference detection component, which is arranged on the side of the frame opposite to the line scan camera component.

10. The on-line visual inspection device for metal strips according to claim 9, characterized in that: The color difference detection component includes a color difference camera, a color difference light source and a motion mechanism, and the motion mechanism drives the color difference camera and the color difference light source to move left and right along the frame.

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