Image acquisition device for label surface defect detection

Abstract

The utility model discloses an image acquisition device for label surface defect detection, which comprises a mounting seat and a shell, one end of the mounting seat in the length direction is detachably connected with a first connecting seat, one end of the shell is connected to the top end of the first connecting seat, the shell is positioned above the mounting seat, a transmission channel is arranged between the shell and the mounting seat, and a matching cavity is arranged in the shell. The matching cavity is matched with a camera assembly, the camera assembly is arranged in the matching cavity in the mode of inclining to the horizontal plane, the shooting end of the camera assembly faces the conveying channel, a connecting frame is arranged on the side, located at the inlet of the conveying channel, of the mounting base in a movable connection mode, and a correlation sensor is arranged in the connecting frame. The camera assembly shoots the label in the direction inclined to the surface of the label, the problem of image blurring caused by reflection of light on the surface of the label when the camera shoots the label with the silver surface in a perpendicular incidence mode can be solved, and the correlation sensor capable of adjusting the position has higher adaptability to induction of labels at different positions or with different sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of image recognition and processing, and particularly relates to an image acquisition device for detecting surface defects of labels. Background Technique

[0002] In order to avoid problems such as incomplete characters, stains, missing printing of characters, etc. in the product labels during industrial printing, people have designed a printing label defect detection method and device applied to industrial printing equipment disclosed in a Chinese invention patent document with the publication number CN112053802B. Through this device, the surface defects of product labels are detected on the industrial printing equipment to determine whether there are defects in the product labels, and in large-scale printing production, printed products with surface defect problems of labels can be screened out in a timely manner.

[0003] During the process of detecting surface defects of labels, it involves the process of acquiring images of printed labels. In this process, a camera device is needed to take pictures of the labels to obtain the images of the labels, which is convenient for subsequent detection steps for the label images. However, when taking pictures of labels with a silver color in a direct shooting manner, since the surface of the label is a smooth surface, the light irradiated on the surface of the label will be reflected in the direction of the camera due to specular reflection on the surface of the label, resulting in reflection during camera shooting and causing the label images obtained by the camera to be blurred.

[0004] In addition, since the printing specifications of labels involved in industrial printing equipment vary widely, and the positions of labels on different products also vary. If the sensors used for automatic camera shooting on industrial printing equipment do not have the function of position adjustment, then the detection of surface defects of labels has certain limitations on the size of the labels and the positions of the labels on the products, and it is impossible to take into account the surface defect detection of more labels with different positions and sizes. Summary of the Utility Model

[0005] Aiming at the above technical deficiencies, the utility model provides an image acquisition device that can solve the problem of image blurring caused by the reflection on the surface of the label when the camera shoots the label with a silver surface in a direct shooting manner, and has a stronger adaptability to sensing labels with different positions or sizes.

[0006] To achieve the above object, the utility model is realized through the following technical solutions:

[0007] The utility model discloses an image acquisition device for detecting surface defects of a label, which comprises a mounting base and a housing. One end of the mounting base in the length direction is detachably connected with a first connecting seat, one end of the housing is connected to the top end of the first connecting seat, the housing is located above the mounting base and there is a transmission channel between the two. The housing is internally provided with an unenclosed matching cavity, the matching cavity is matched with a camera assembly, the camera assembly is arranged in the matching cavity in a form inclined to the horizontal plane and its shooting end faces the transmission channel. One side of the mounting base located at the entrance of the transmission channel is provided with a first through hole, the first through hole is matched with a connecting frame, and a pair of photoelectric sensors is arranged in the connecting frame.

[0008] Further, the connecting frame is in a C shape, the end of the non-opening side of the connecting frame is fitted in the first through hole, the pair of photoelectric sensors is arranged at the upper and lower end parts of the opening side of the connecting frame, a waist-shaped hole is arranged at the lower end of the opening side of the connecting frame, and a matching hole facing the waist-shaped hole is arranged on the surface of the mounting base close to the lower end of the opening side of the connecting frame.

[0009] Further, the mounting base outside the first through hole is provided with a strip-shaped second through hole, and the pair of photoelectric sensors completes the opposite irradiation through the second through hole.

[0010] Further, the first through hole is composed of two grooves provided at the end of the mounting base and the end of the first connecting seat.

[0011] Further, wire grooves are arranged on the connecting frames outside the pair of photoelectric sensors.

[0012] Further, one end of the housing is connected to the end of the first connecting seat through a rotating shaft.

[0013] Further, the surface of the mounting base where the transmission channel is located is an inclined plane.

[0014] Further, one end of the mounting base in the length direction is detachably connected with a second connecting seat, an extension section is arranged at the end of the second connecting seat far from the mounting base, the extension section extends in a direction parallel to the transmission direction of the label in the transmission channel, and a mounting hole is arranged at the end of the extension section far from the second connecting seat.

[0015] The beneficial effects of the utility model are as follows:

[0016] When the camera component in the image acquisition device takes pictures of the label as it passes through the transmission channel in a direction inclined to the surface of the label, it can solve the problem of image blurring caused by the reflection on the surface of the label when the camera takes pictures of the label on the silver surface in a direct shooting manner, thereby obtaining a clear label image to ensure that the label image can be used normally in subsequent label surface defect detection. Moreover, by adjusting the position of the connecting frame in the transmission channel, the opposed sensors have stronger adaptability when sensing labels of different positions or sizes on the transmission channel, which is helpful for the image acquisition and splicing effect in the subsequent label surface defect detection process to meet the usage requirements for surface defect detection of labels of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the image acquisition device Figure 1 .

[0018] Figure 2 is a schematic structural diagram of the image acquisition device Figure 2 .

[0019] Figure 3 is a schematic structural diagram of the image acquisition device Figure 3 .

[0020] Figure 4 is a schematic diagram when the camera component takes pictures of the label at the transmission channel.

[0021] Figure 5 is a schematic diagram when the opposed sensors sense the label at the transmission channel.

[0022] Figure 6 is a schematic structural diagram of the image acquisition device after the housing rotates.

[0023] In the figure, 1, mounting base; 11, mating hole; 12, second through hole; 13, inclined surface; 2, housing; 21, mating cavity; 22, rotating shaft; 3, first connecting seat; 4, transmission channel; 5, camera component; 6, first through hole; 7, connecting frame; 71, waist-shaped hole; 72, wire groove; 8, opposed sensor; 9, groove; 10, second connecting seat; 101, extension section; 102, mounting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model discloses an image acquisition device for label surface defect detection, as Figures 1 to 5As shown in combination, it includes a mounting base 1 and a housing 2. One end of the mounting base 1 in the length direction is detachably connected to a first connecting base 3. One end of the housing 2 is connected to the top of the first connecting base 3. The housing 2 is located above the mounting base 1 and a transmission channel 4 is provided between them. An unenclosed fitting cavity 21 is provided in the housing 2. A camera assembly 5 is fitted in the fitting cavity 21. The camera assembly 5 is arranged in the fitting cavity 21 in a form inclined to the horizontal plane and its shooting end faces the transmission channel 4. A first through hole 6 is provided on one side of the mounting base 1 at the entrance of the transmission channel 4. The first through hole 6 is fitted with a connecting frame 7. A through-beam sensor 8 is provided in the connecting frame 7.

[0025] It should be noted that this image acquisition device is arranged on an industrial printing device. The transmission channel 4 in this image acquisition device is located on the path of the industrial printer for transmitting products with labels. When the product passes through the transmission channel 4 near the through-beam sensor 8, the through-beam sensor 8 senses the label on the product and sends a control instruction to the camera assembly 5. After the label passes through the through-beam sensor 8, the camera assembly 5 will take a picture of the label to obtain an image of the label. When taking pictures of labels with a silver surface, since the camera assembly 5 needs to use a flash to supplement light to the label during the shooting process to obtain a clear label image, when the light irradiates the label with a silver surface, specular reflection will be formed on the surface of the label. If the camera assembly 5 shoots the label in a direct way, the specular reflection formed on the surface of the label will concentrate and reflect the light to the position where the camera assembly 5 is located, resulting in too high light brightness in the shooting direction of the camera assembly 5, which will cause the obtained label image to be blurred and unable to be used in subsequent processing steps. Therefore, shooting the label in a direction inclined to the surface of the label can solve the problem of image blurring caused by specular reflection on the surface of the label when the camera shoots the label with a silver surface in a direct way, so as to obtain a clear label image to ensure that the label image can be used normally in subsequent label surface defect detection.

[0026] In addition, by adjusting the position of the connecting frame 7 in the first through hole 6, the position of the connecting frame 7 in the transmission channel 4 can be changed, so as to adjust the position where the through-beam sensor 8 senses on the transmission channel 4, making the through-beam sensor 8 have stronger adaptability when sensing labels at different positions or of different sizes on the transmission channel 4, which plays a certain role in helping the image splicing effect during subsequent label surface defect detection to meet the use requirements when detecting surface defects of different specifications of labels.

[0027] As a further preference of the above embodiment, such as Figure 1 and Figure 3As shown in combination, the connecting frame 7 is C-shaped. The end of the non-opening side of the connecting frame 7 is fitted into the first through hole 6. The opposed sensors 8 are arranged at the upper and lower ends of the opening side of the connecting frame 7. A waist-shaped hole 71 is provided at the lower end of the opening side of the connecting frame 7. A mating hole 11 facing the waist-shaped hole 71 is provided on the surface of the mounting seat 1 near the lower end of the opening side of the connecting frame 7.

[0028] Among them, by loading a connecting component into the waist-shaped hole 71 and the mating hole 11, the connecting frame 7 is fixed to the mounting seat 1 through the connecting component. However, different positions of the connecting component in the waist-shaped hole 71 will change the position of the connecting frame 7 on the transmission channel 4, and thus change the position of the opposed sensors 8 on the transmission channel 4. When products of different widths pass through the transmission channel 4, the opposed sensors 8 can make adaptive adjustments to their positions according to the labels at different positions on the products or labels of different sizes and specifications, so as to achieve the purpose that the opposed sensors 8 can sense the labels passing through different positions of the transmission channel 4.

[0029] As a further preference of the above embodiment, as Figure 1 and Figure 3 As shown in combination, a strip-shaped second through hole 12 is provided on the mounting seat 1 outside the first through hole 6. The opposed sensors 8 complete the opposed sensing through the second through hole 12.

[0030] Specifically, on the premise that the position of the connecting frame 7 can be adjusted, the position of the opposed sensors 8 for label sensing through opposed sensing also needs to be adjusted. Therefore, a second through hole 12 is provided on the mounting seat 1 to cooperate with the opposed sensors 8 to continue maintaining the opposed sensing after the position of the opposed sensors 8 is adjusted, so as to avoid the normal operation of the opposed sensors 8 after position adjustment being affected by the mounting seat 1.

[0031] As a further preference of the above embodiment, as Figure 1 and Figure 3 As shown in combination, the first through hole 6 is composed of two grooves 9 provided at the end of the mounting seat 1 and the end of the first connecting seat 3.

[0032] Among them, after the first connecting seat 3 is connected to the mounting seat 1, the first through hole 6 formed by the grooves 9 of the two provides space for the position adjustment of the connecting frame 7. When it is necessary to remove the opposed sensors 8 from the image acquisition device for replacement, after the first connecting seat 3 is removed from the mounting seat 1, the connecting frame 7 can be removed from the image acquisition device, which is convenient for operation.

[0033] As a further preference of the above embodiment, as Figure 1 and Figure 3 As shown in combination, wire grooves 72 are provided on the connecting frame 7 outside the opposed sensors 8.

[0034] Among them, the wire grooves 72 at the upper and lower ends of the connecting frame 7 can provide space for wiring the opposed sensors 8 on the connecting frame 7 after the opposed sensors 8 are installed on the connecting frame 7, facilitating the wiring operation of the opposed sensors 8 after being embedded in the connecting frame 7.

[0035] As a further preference of the above embodiment, as Figure 1 and Figure 6 shown in combination, one end of the housing 2 is connected to the end of the first connecting seat 3 through a rotating shaft 22.

[0036] Among them, since the housing 2 and the mounting seat 1 in the normal state are respectively located on the upper and lower sides of the transmission channel 4, and the opening position on the non-closed fitting cavity 21 faces the transmission channel 4, when it is necessary to remove the camera assembly 5 fitted in the fitting cavity 21, the housing 2 can be rotated with the rotating shaft 22 as the rotation center, and the fitting cavity 21 is in a position far from the transmission channel 4 after the housing 2 rotates, so that there is enough space for the operator to remove the camera assembly 5 from the fitting cavity 21, facilitating the operation during the maintenance of the camera assembly 5.

[0037] As a further preference of the above embodiment, as Figure 4 shown, the surface of the mounting seat 1 where the transmission channel 4 is located is an inclined surface 13.

[0038] Among them, by setting the surface of the mounting seat 1 where the transmission channel 4 is located as the inclined surface 13, the height difference formed by the inclined surface 13 can be utilized to adjust the tension of the product during the transmission of the product, so that the label on the surface of the product can be completely displayed and sensed by the opposed sensors 8 when the product passes through the opposed sensors 8, and at the same time, the label can also be completely photographed by the camera assembly 5, avoiding the situation that the label is wrinkled due to insufficient tension of the product during transmission, and preventing the problems that the label cannot be sensed by the opposed sensors 8 and the label image photographed by the camera assembly 5 is incomplete, ensuring that the label image can be used normally in the subsequent label surface defect detection.

[0039] As a further preference of the above embodiment, as Figure 2 shown, one end of the mounting seat 1 in the length direction is detachably connected with a second connecting seat 10. An extension section 101 is provided at the end of the second connecting seat 10 away from the mounting seat 1. The extension section extends in a direction parallel to the direction of label transmission of the transmission channel 4. A mounting hole 102 is provided at the end of the extension section 101 away from the second connecting seat 10.

[0040] Among them, the provision of the second connecting seat 10 can provide a connecting position for installing the image acquisition device to the industrial printing equipment. The connection between the second connecting seat 10 and the industrial printing equipment is realized by installing a connecting component into the mounting hole 102 at the end of the extension section 101, so as to install the image acquisition device onto the industrial printing equipment. The installation operation is simple and convenient.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An image acquisition device for label surface defect detection, comprising a mounting seat and a housing, characterized in that: One end of the mounting seat in the length direction is detachably connected to the first connecting seat, one end of the shell is connected to the top of the first connecting seat, the shell is located above the mounting seat and a transmission channel is provided between the two, a non-enclosed matching cavity is provided in the shell, the matching cavity is matched with a camera assembly, the camera assembly is arranged in the matching cavity in a form inclined to the horizontal plane and its shooting end faces the transmission channel, a first through hole is provided on one side of the mounting seat at the entrance of the transmission channel, the first through hole is matched with a connecting frame, and a corresponding shooting sensor is provided in the connecting frame.

2. The image acquisition device for label surface defect detection according to claim 1, characterized in that: The connecting frame is C-shaped, and the end of the non-opening side of the connecting frame is fitted in the first through hole. The radiation sensor is arranged in the upper and lower ends of the opening side of the connecting frame. The lower end of the opening side of the connecting frame is provided with a waist hole, and the surface of the mounting seat close to the lower end of the opening side of the connecting frame is provided with a matching hole facing the waist hole.

3. The image acquisition device for label surface defect detection according to claim 1, characterized in that: The mounting seat outside the first through hole is provided with a second through hole in a strip shape, and the through-beam sensor completes the through-beam through the second through hole.

4. The image acquisition device for label surface defect detection according to claim 1, characterized in that: The first through hole is formed by combining two grooves provided at the end of the mounting seat and the end of the first connecting seat.

5. The image acquisition device for label surface defect detection according to claim 1, characterized in that: The connecting frames outside the through-beam sensors are all provided with wire grooves.

6. The image acquisition device for label surface defect detection according to claim 1, characterized in that: One end of the shell is connected to the end portion connected to the first connecting seat through a rotating shaft.

7. The image acquisition device for label surface defect detection according to claim 1, characterized in that: The surface of the mounting seat where the transmission channel is located is an inclined surface.

8. The image acquisition device for label surface defect detection according to claim 1, characterized in that: One end of the mounting seat in the length direction is detachably connected to a second connecting seat, and an extension section is provided at the end of the second connecting seat away from the mounting seat. The extension section extends in the direction of label transmission parallel to the transmission channel, and a mounting hole is provided at the end of the extension section away from the second connecting seat.

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