Bending Degree Measurement Apparatus and Method

Abstract

This invention belongs to the field of cigarette packaging testing technology and discloses a bending degree measuring device and method. The bending degree measuring device includes a support structure, an image acquisition structure, and a detection system. The support structure is used to place the label paper, provide illumination to the label paper, and flatten the label paper. The image acquisition structure is located on top of the support structure and is used to acquire original images of the front and back sides of the label paper, as well as an image of the flattened label paper. The detection system is connected to both the support structure and the image acquisition structure. The detection system receives the original images of the front, back, and flattened sides of the label paper acquired by the image acquisition structure and obtains the bending degree of the label paper based on these images. This bending degree measuring device can measure the bending degree of label paper, select label paper with acceptable bending degree for processing, and avoid reduced production efficiency due to poor bending degree.

Description

Technical Field

[0001] This invention relates to the field of cigarette packaging testing technology, and more particularly to a device and method for measuring flexural curvature. Background Technology

[0002] Hard-pack flip-top cigarette packs are a common type of cigarette packaging, consisting of a single sheet of label paper covering the pack. Typically, the label paper is first bent using specialized equipment. The degree of bending is a parameter characterizing the extent of the label paper's curvature, referring to the wrinkles or warping that occur perpendicular to the paper surface. Excessive bending of the label paper can affect paper feeding in various processes on the production line, causing paper jams, machine stoppages, and blurred wrinkles. This not only reduces paper printing capacity but also significantly lowers production line efficiency. Furthermore, a large degree of bending when the label paper is placed into the packaging equipment can easily cause paper jams during automatic paper handling.

[0003] Therefore, there is an urgent need for a bending degree measuring device and method to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a bending degree measuring device and method, which can measure the bending degree of label paper and avoid reduced production efficiency due to poor bending degree of label paper.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A bending degree measuring device, the bending degree measuring device comprising:

[0007] A support structure for placing the trademark paper, providing light to the trademark paper, and flattening the trademark paper;

[0008] An image acquisition structure is provided on top of the supporting structure for acquiring the original front image, the original back image, and the flattened image of the trademark paper.

[0009] The detection system is connected to both the supporting structure and the image acquisition structure. The detection system is used to receive the original front image, the original back image, and the flattened image acquired by the image acquisition structure, and to obtain the curvature of the trademark paper based on the original front image, the original back image, and the flattened image.

[0010] As an optional technical solution, the supporting structure includes a pressing board and a supplementary lighting component. The pressing board and the supplementary lighting component are connected. The supplementary lighting component is used to support the trademark paper and supplement the trademark paper with light. The pressing board is used to flatten the trademark paper.

[0011] As an optional technical solution, the supplementary lighting component includes a light source and a light-diffusing plate, with the light source positioned below the light-diffusing plate and the trademark paper positioned on the light-diffusing plate.

[0012] As an optional technical solution, the pressing board is a transparent board.

[0013] As an optional technical solution, a first level is provided on the light-diffusing plate, which is used to indicate the levelness of the light-diffusing plate.

[0014] As an optional technical solution, the image acquisition structure includes a support assembly and an image acquisition device. The support assembly is disposed around the periphery of the supplementary lighting assembly, and the image acquisition device is connected to the support assembly. The image acquisition device is located on top of the supplementary lighting assembly and is connected to the detection system.

[0015] As an optional technical solution, the support assembly includes columns and support rods, with two columns disposed on both sides of the load-bearing structure, the support rods being movably connected between the two columns, and the image acquisition device disposed on the support rods.

[0016] As an optional technical solution, the image acquisition device is equipped with a second level, which is used to indicate the levelness of the image acquisition device.

[0017] As an optional technical solution, the bending degree measuring device also includes a frame, and the supporting structure and the image acquisition structure are both disposed on the frame.

[0018] The present invention also adopts the following technical solutions:

[0019] The measurement method, applicable to the bending degree measuring device described above, includes the following steps:

[0020] S10. The trademark paper is placed on the supporting structure, the supporting structure provides supplemental lighting to the trademark paper, the image acquisition structure acquires an image of the front of the trademark paper, and the detection system receives the original image information of the front of the trademark paper obtained by the image acquisition structure.

[0021] S20. Pick up the trademark paper and flip it over, then place the trademark paper on the supporting structure. The image acquisition structure acquires an image of the reverse side of the trademark paper, and the detection system receives the original image information of the reverse side of the trademark paper obtained by the image acquisition structure.

[0022] S30. The supporting structure flattens the trademark paper, the image acquisition structure acquires a flattened image of the trademark paper in the flattened state, and the detection system receives the flattened image information of the trademark paper obtained by the image acquisition structure.

[0023] S40. The detection system obtains the curvature of the trademark paper based on the image information received three times.

[0024] The beneficial effects of this invention are:

[0025] This invention discloses a bending degree measuring device, which includes a support structure, an image acquisition structure, and a detection system. The support structure is used to place and illuminate the label paper, and to flatten it. The image acquisition structure is located on top of the support structure and is used to acquire original images of the front, back, and flattened sides of the label paper. The detection system is connected to both the support structure and the image acquisition structure. The detection system receives the original front, back, and flattened images of the label paper acquired by the image acquisition structure, and obtains the bending degree of the label paper based on these images. This bending degree measuring device can measure the bending degree of label paper, select label paper with acceptable bending degree for processing, and avoid reduced production efficiency due to poor bending degree.

[0026] The present invention also discloses a measurement method that uses the above-mentioned bending degree measuring device to measure the bending degree of trademark paper, thereby ensuring production efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the bending degree measuring device according to an embodiment of the present invention;

[0028] Figure 2 This is a flowchart of the bending degree measurement according to an embodiment of the present invention.

[0029] In the picture:

[0030] 1. Calibration paper;

[0031] 10. Load-bearing structure; 11. Pressing plate; 121. Light source; 122. Light-diffusing plate; 1221. First level;

[0032] 20. Image acquisition structure; 211. Column; 2111. Pole; 2112. Support rod; 212. Support rod; 22. CCD camera; 221. Second level;

[0033] 30. Detection system;

[0034] 40. Frame; 41. Table; 42. Support legs; 421. Height adjustment components;

[0035] 50. Synchronization component. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0040] like Figure 1As shown, this embodiment provides a bending degree measuring device, which includes a support structure 10, an image acquisition structure 20, and a detection system 30. The support structure 10 is used to place the label paper, provide supplemental lighting to the label paper, and flatten the label paper. The image acquisition structure 20 is disposed on the top of the support structure 10 and is used to acquire the original front image, the original back image, and the flattened image of the label paper. The detection system 30 is connected to both the support structure 10 and the image acquisition structure 20. The detection system 30 is used to receive the original front image, the original back image, and the flattened image of the label paper acquired by the image acquisition structure 20, and to obtain the bending degree of the label paper based on the original front image, the original back image, and the flattened image of the label paper. Specifically, in this embodiment, the supporting structure 10 can hold the trademark paper and acquire images through the image acquisition structure 20. The supporting structure 10 can also provide supplementary lighting to the trademark paper, making it easier to acquire images. The supporting structure 10 can also flatten the trademark paper, making it easier to obtain a flattened image of the trademark paper. The detection system 30 is connected to the supporting structure 10 and the image acquisition structure 20, and can control the supplementary lighting of the supporting structure 10. It can also receive the original front image, the original back image, and the flattened image of the trademark paper acquired by the image acquisition structure 20, and compare the original front image and the original back image with the flattened image of the trademark paper to obtain the curvature of the trademark paper.

[0041] Furthermore, the supporting structure 10 includes a pressing plate 11 and a supplementary lighting component. The pressing plate 11 and the supplementary lighting component are connected. The supplementary lighting component is used to support the label paper and provide supplementary lighting to the label paper. The pressing plate 11 is used to flatten the label paper. Specifically, in this embodiment, the label paper is supported by the supplementary lighting component, which illuminates the four sides of the label paper to facilitate image acquisition by the image acquisition structure 20. The pressing plate 11 flattens the label paper, facilitating the image acquisition structure 20 to acquire the flattened image of the label paper. Optionally, in this embodiment, the pressing plate 11 is rotatably connected to one side of the supplementary lighting component via a hinge for ease of use.

[0042] Furthermore, the supplementary lighting component includes a light source 121 and a light-diffusing plate 122. The light source 121 is disposed below the light-diffusing plate 122, and the label paper is disposed on the light-diffusing plate 122. Specifically, in this embodiment, the light source 121 is a panel light source, and the light-diffusing plate 122 is disposed on the panel light source, which allows the light emitted by the light source 121 to pass through the light-diffusing plate 122, making the light source 121 around the label paper more uniform, and facilitating the acquisition of the label paper image.

[0043] Furthermore, the pressure plate 11 is a transparent plate. Specifically, this arrangement allows the pressure plate 11 to always keep the label paper flat, and during image acquisition, the pressure plate 11 maintains a flat state on the label paper, ensuring the flatness of the label paper during image acquisition and improving the accuracy of image acquisition.

[0044] Furthermore, a first level 1221 is provided on the light-diffusing plate 122, which is used to indicate the levelness of the light-diffusing plate 122. Specifically, in this embodiment, the first level 1221 can indicate the levelness of the light-diffusing plate 122, so that the trademark paper on the light-diffusing plate 122 remains in a horizontal state, which facilitates the image acquisition structure 20 to acquire the image of the trademark paper. In this embodiment, the bending degree measuring device has a first adjustment structure for adjusting the levelness of the light-diffusing plate 122.

[0045] Furthermore, the image acquisition structure 20 includes a support assembly and an image acquisition device. The support assembly is disposed around the periphery of the supplementary lighting assembly, and the image acquisition device is connected to the support assembly. The image acquisition device is located on top of the supplementary lighting assembly and is connected to the detection system 30. Specifically, in this embodiment, the support assembly is disposed around the periphery of the supplementary lighting assembly to support the image acquisition device and ensure its stability. The image acquisition device is located above the supplementary lighting assembly, which facilitates image acquisition of the trademark paper. The image acquisition device is connected to the detection system 30, which can transmit the acquired image information to the detection system 30, facilitating the detection system 30 to obtain the curvature of the trademark paper. Optionally, the image acquisition device in this embodiment is a CCD camera 22. The CCD camera 22 has advantages such as small size, high reliability, high sensitivity, resistance to strong light, vibration, and magnetic fields, low distortion, long life, clear images, and simple operation, which can ensure the accuracy and clarity of image acquisition and ensure that the curvature obtained by the detection system 30 is more reliable.

[0046] Furthermore, the support assembly includes columns 211 and support rods 212. Two columns 211 are positioned on either side of the supplementary lighting assembly, and the support rod 212 is movably connected between the two columns 211. The image acquisition device is mounted on the support rod 212. Specifically, in this embodiment, the two columns 211 support the support rod 212, and the image acquisition device is mounted on the support rod 212. This ensures the stability of the image acquisition device installation. The movable connection of the support rod 212 between the two columns 211 facilitates adjustment of the image acquisition device's height, providing greater flexibility in image acquisition and enabling normal image acquisition when using different image acquisition devices. In this embodiment, the column 211 includes a vertical rod 2111 and a support rod 2112. The vertical rod 2111 and the support rod 2112 are angled together, with the bottom of the support rod 2112 located away from the bottom of the vertical rod 2111. The support rod 2112 provides support to the vertical rod 2111, ensuring stability.

[0047] Furthermore, a second level 221 is provided on the image acquisition device, which is used to indicate the levelness of the image acquisition device. Specifically, in this embodiment, the image acquisition device is a CCD camera 22. To ensure that the lens of the CCD camera 22 is always perpendicular to the supplementary lighting component, a first level 1221 is provided on the supplementary lighting component, and a second level 221 is provided on the image acquisition device. As long as both the first level 1221 and the second level 221 are kept horizontal, it can be ensured that the lens of the CCD camera 22 is always perpendicular to the supplementary lighting component, thereby improving the accuracy of image acquisition and the accuracy of the subsequent obtained curvature. Specifically, in this embodiment, the image acquisition device has a first connecting hole, and the support rod 212 has a second connecting hole. A first fastening bolt passes through the first connecting hole and the second connecting hole in sequence and is threadedly connected to a nut to connect the image acquisition device to the support rod 212. The second connecting hole is an oblong hole. When it is necessary to adjust the levelness of the image acquisition device, i.e., the CCD camera 22, it is only necessary to loosen the first fastening bolt for adjustment.

[0048] Furthermore, the bending degree measuring device also includes a frame 40, on which the supporting structure 10 and the image acquisition structure 20 are both mounted. Specifically, in this embodiment, the frame 40 includes a platform 41 and multiple legs 42. The multiple legs 42 support the platform 41. The supplementary lighting component is mounted on the platform 41. The bottoms of the upright 2111 and the support rod 2112 are both mounted on the platform 41. The support legs 42 are equipped with height adjustment components 421, which are the first adjustment structures. By adjusting the height of the support legs 42, the levelness of the platform 41 is adjusted, thereby adjusting the levelness of the supplementary lighting component. Optionally, the height adjustment component 421 is an adjusting nut.

[0049] Furthermore, the bending degree measuring device in this embodiment also includes a synchronization component 50, which is disposed between the detection system 30 and the light source 121 and the image acquisition device, and is used to enable the light source 121 and the image acquisition device to start or stop synchronously.

[0050] like Figure 2 As shown, this embodiment also discloses a measurement method applicable to the above-mentioned bending degree measuring device, which includes the following steps.

[0051] S10. The trademark paper is placed on the support structure 10, the support structure 10 provides supplemental lighting to the trademark paper, the image acquisition structure 20 acquires an image of the front of the trademark paper, and the detection system 30 receives the original image information of the front of the trademark paper obtained by the image acquisition structure 20.

[0052] Specifically, in this embodiment, one side of the trademark paper is first placed upwards on the supplementary lighting component of the supporting structure 10. The supplementary lighting component provides supplementary lighting to the trademark paper, and the image acquisition structure 20 acquires an image of the trademark paper. The image of that side of the trademark paper is the original front image A1, and the detection system 30 receives the original front image A1.

[0053] Optionally, the following steps are included before step S10:

[0054] S1. Adjust the height adjustment component 421 of the support leg 42 of the frame 40 so that the first level 1221 is in a horizontal state.

[0055] Specifically, this step ensures that the supplementary lighting components are in a horizontal position, improving the accuracy of the measurement.

[0056] S2. Adjust the height of the support rod 212 according to the size of the trademark paper so that the CCD camera 22 is at a suitable height, and then adjust the first fastening bolt so that the second level 221 is in a horizontal state.

[0057] Specifically, this step ensures that the lens of the CCD camera 22 is perpendicular to the lighting assembly, thus guaranteeing the accuracy of image acquisition.

[0058] S3. Adjust the synchronization component 50 to enable the image acquisition unit and the fill light component to start synchronously.

[0059] Specifically, this step can save energy and avoid the waste of electrical resources.

[0060] S4. Use calibration paper 1 to check the clarity of the images captured by CCD camera 22.

[0061] Specifically, open the pressure plate 11, place the calibration paper 1 on the support structure 10, and adjust the focal length of the CCD camera 22 to make the image formed by the calibration paper 1 clear. This step ensures that the image acquired by the CCD camera 22 is clear, improving the accuracy of the curvature measurement results.

[0062] S20. Pick up the trademark paper and flip it over, then place the trademark paper on the support structure 10. The image acquisition structure 20 acquires an image of the reverse side of the trademark paper, and the detection system 30 receives the original image information of the reverse side of the trademark paper obtained by the image acquisition structure 20.

[0063] Specifically, in this embodiment, the side of the trademark paper where the image has been acquired is attached to the supplementary lighting component, so that the other side of the trademark paper faces the CCD camera 22. The CCD camera 22 acquires an image of the trademark paper, and the acquired image of that side is the original reverse image A2. The detection system 30 receives the original reverse image A2.

[0064] Optionally, in this embodiment, the side of the trademark paper where the image is first captured is set as the front side.

[0065] S30, the bearing structure 10 flattens the trademark paper, the image acquisition structure 20 acquires the flattened image of the trademark paper, and the detection system 30 receives the flattened image information of the trademark paper obtained by the image acquisition structure 20.

[0066] Specifically, this step includes rotating the pressure plate 11 relative to the supplementary lighting component so that the pressure plate 11 can flatten the trademark paper. The CCD camera 22 acquires an image of the trademark paper below the pressure plate 11 to obtain a flattened image A3, and the detection system 30 receives the flattened image A3.

[0067] S40, the detection system 30 obtains the curvature of the trademark paper based on the image information received three times.

[0068] Specifically, in this embodiment, the detection system 30 includes a data processing unit capable of denoising and binary converting the original front image A1, the original back image A2, and the flattened image A3, and obtaining image connected components B1, B2, and B3 representing the trademark paper, respectively. The data processing unit calculates the number of pixels in the image connected components B1, B2, and B3 as a1, a2, and a3, respectively. Therefore, the curvature λ of the trademark paper is:

[0069]

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A device for measuring flexural rigidity, characterized in that, The bending degree measuring device includes: The support structure (10) is used to place the trademark paper and to provide light to the trademark paper, and to flatten the trademark paper. Image acquisition structure (20), the image acquisition structure (20) is disposed on the top of the support structure (10), and is used to acquire the original front image, the original back image and the flattened image of the trademark paper after it is flattened; The detection system (30) is connected to both the bearing structure (10) and the image acquisition structure (20). The detection system (30) is used to receive the original front image, the original back image and the flattened image acquired by the image acquisition structure (20), and to obtain the curvature of the trademark paper based on the original front image, the original back image and the flattened image. The detection mechanism (30) includes a data processing unit, which is capable of denoising and binary conversion of the original front image, the original back image, and the flattened image to obtain image connected components B1, B2, and B3 representing the trademark paper, respectively. The data processing unit calculates the number of pixels in the image connected components B1, B2, and B3 as a1, a2, and a3, respectively. The curvature of the trademark paper is: ； in, The curvature of the trademark paper.

2. The bending degree measuring device according to claim 1, characterized in that, The supporting structure (10) includes a pressing board (11) and a supplementary lighting component. The pressing board (11) and the supplementary lighting component are connected. The supplementary lighting component is used to support the trademark paper and supplement the trademark paper with light. The pressing board (11) is used to flatten the trademark paper.

3. The bending degree measuring device according to claim 2, characterized in that, The supplementary lighting assembly includes a light source (121) and a light-diffusing plate (122). The light source (121) is disposed below the light-diffusing plate (122), and the trademark paper is disposed on the light-diffusing plate (122).

4. In the bending degree measuring device according to claim 2, the pressure plate (11) is a transparent plate.

5. The bending degree measuring device according to claim 3, characterized in that, A first level (1221) is provided on the light-diffusing plate (122), which is used to indicate the levelness of the light-diffusing plate (122).

6. The bending degree measuring device according to claim 2, characterized in that, The image acquisition structure (20) includes a support assembly and an image acquisition device. The support assembly is disposed around the periphery of the supplementary lighting assembly. The image acquisition device is connected to the support assembly and is located on top of the supplementary lighting assembly. The image acquisition device is also connected to the detection system (30).

7. The bending degree measuring device according to claim 6, characterized in that, The support assembly includes columns (211) and support rods (212). The two columns (211) are disposed on both sides of the load-bearing structure (10), and the support rods (212) are movably connected between the two columns (211). The image acquisition device is disposed on the support rods (212).

8. The bending degree measuring device according to claim 7, characterized in that, The image acquisition device is equipped with a second level (221), which is used to indicate the levelness of the image acquisition device.

9. The bending degree measuring device according to any one of claims 1-8, characterized in that, The bending degree measuring device also includes a frame (40), and the supporting structure (10) and the image acquisition structure (20) are both disposed on the frame (40).

10. A measurement method applicable to the bending degree measuring device as described in any one of claims 1-9, characterized in that, The determination method includes the following steps: S10. The trademark paper is placed on the support structure (10), the support structure (10) provides supplemental lighting to the trademark paper, the image acquisition structure (20) acquires an image of the front of the trademark paper, and the detection system (30) receives the original image information of the front of the trademark paper obtained by the image acquisition structure (20). S20. Pick up the trademark paper and flip it over, then place the trademark paper on the support structure (10). The image acquisition structure (20) acquires an image of the reverse side of the trademark paper. The detection system (30) receives the original image information of the reverse side of the trademark paper obtained by the image acquisition structure (20). S30, the supporting structure (10) flattens the trademark paper, the image acquisition structure (20) acquires the flattened image of the trademark paper in the flattened state, and the detection system (30) receives the flattened image information of the trademark paper obtained by the image acquisition structure (20); S40. The detection system (30) obtains the curvature of the trademark paper based on the image information received three times.

Images