Waterproof powder quality detection device and method

Abstract

The application discloses a water-blocking powder quality detection device and method, and relates to the technical field of power cable detection. The scheme strips the water-blocking tape to be detected by a water-blocking tape stripping device to obtain a water-blocking powder layer, collects the image of the water-blocking powder in the water-blocking powder layer by a charge-coupled imaging module, and generates the quality detection result of the water-blocking powder according to the image data by an image processing module. The image processing technology is used to realize the quality detection of the water-blocking powder, has the advantage of repeatability, saves the labor cost and the time cost, and can continuously detect the water-blocking powder of the water-blocking tape, avoids the error of the detection result caused by the distribution difference of the water-blocking powder of the water-blocking tape, and improves the detection accuracy and the test efficiency.

Description

Technical Field

[0001] This application relates to the field of power cable testing technology, and in particular to a device and method for testing the quality of water-blocking powder. Background Technology

[0002] High-voltage cable buffer layers typically employ semi-conductive water-blocking tape, specifically composed of a non-woven fabric layer, a water-blocking powder layer, and a fluffy cotton layer. Sodium polyacrylate water-blocking powder is incorporated into this structure. When exposed to moisture, the sodium polyacrylate water-blocking powder expands rapidly, preventing moisture from further penetrating along the cable's longitudinal direction, thus achieving longitudinal water blocking. Currently, the harmful effects of ablation defects caused by moisture intrusion in high-voltage cable buffer layers have attracted widespread attention, and the quality inspection of water-blocking tape in high-voltage cable buffer layers has become a key research objective for those skilled in the art.

[0003] Currently, the quality testing of water-blocking tape generally refers to the JB / T 10259 standard. The main parameters related to the water-blocking performance of water-blocking tape in this standard are expansion rate and expansion height. However, the testing process for water-blocking tape based on expansion rate and expansion height is irreversible and non-repeatable; once the test sample is destroyed, the test results cannot be verified.

[0004] In view of the above problems, how to better achieve the quality inspection of water-blocking powder in high-voltage cable water-blocking tape is an urgent problem to be solved by technicians in this field. Summary of the Invention

[0005] The purpose of this application is to provide a device and method for testing the quality of water-blocking powder in high-voltage cables, so as to better achieve the quality testing of water-blocking powder in high-voltage cable water-blocking tape.

[0006] To solve the above-mentioned technical problems, this application provides a water-blocking powder quality testing device, including: a water-blocking tape peeling device, a charge-coupled imaging module, and an image processing module;

[0007] The water-blocking tape peeling device is used to peel off the water-blocking tape to be tested in order to obtain the water-blocking powder layer of the water-blocking tape to be tested.

[0008] The charge-coupled imaging module is communicatively connected to the image processing module and is used to acquire images of the water-blocking powder in the water-blocking powder layer and transmit the image data to the image processing module.

[0009] The image processing module is used to generate the quality test result of the water-blocking powder of the water-blocking tape to be tested based on the image data.

[0010] Preferably, the water-blocking tape stripping device includes: a first roller, a second roller, a third roller, and a fourth roller;

[0011] The third roller is disposed between the first roller and the fourth roller; the axes of the first roller, the third roller, and the fourth roller are parallel to each other; the plane formed by the axes of the first roller, the third roller, and the fourth roller is parallel to the image acquisition plane.

[0012] The second roller is positioned above the fourth roller; the axis of the second roller is parallel to the axis of the fourth roller; the plane formed by the axis of the second roller and the axis of the fourth roller is perpendicular to the image acquisition plane.

[0013] The angular velocity of the first roller when it rotates is the same as that of the second roller when it rotates, but in opposite directions;

[0014] The image acquisition plane is the plane on which the water-blocking powder layer is peeled off; the vertical projection of the charge-coupled imaging module is onto the upper surface of the image acquisition plane.

[0015] Preferably, the water-blocking tape peeling device further includes a light-shielding plate;

[0016] The light-shielding plate is disposed on the lower surface of the image acquisition plane.

[0017] Preferably, it further includes: a microscopic magnification module;

[0018] The microscopic magnification module is connected to the charge-coupled imaging module and is used to magnify the image when the charge-coupled imaging module acquires the image of the water-blocking powder in the water-blocking powder layer.

[0019] Preferably, it further includes: a parallel light source;

[0020] The parallel light source is positioned on the microscopic magnification module, and the parallel light emitted by the parallel light source is perpendicular to the image acquisition plane.

[0021] To address the aforementioned technical problems, this application also provides a method for detecting the quality of water-blocking powder, applied to the aforementioned water-blocking powder quality detection device; the method includes:

[0022] Receive image data of water-blocking powder in the water-blocking powder layer of the water-blocking strip under test, acquired by the charge-coupled imaging module;

[0023] The quality test result of the water-blocking powder of the water-blocking tape to be tested is generated based on the image data.

[0024] Preferably, the image data of the water-blocking powder in the water-blocking powder layer of the water-blocking strip to be tested, acquired by the charge-coupled imaging module, includes:

[0025] The system receives multiple sets of image data of the water-blocking powder in the water-blocking powder layer, which are acquired by the charge-coupled imaging module at a preset period.

[0026] Preferably, before generating the quality test result of the water-blocking powder of the water-blocking tape to be tested based on the image data, the method further includes:

[0027] Each sub-image of a preset size is selected from the image data in each group as an object in the image dataset;

[0028] Each object in the image dataset is sequentially subjected to grayscale conversion, wavelet denoising, image enhancement, and binarization.

[0029] Preferably, the quality detection result of the water-blocking powder of the water-blocking tape to be tested generated based on the image data includes:

[0030] Obtain the area fraction of the water-blocking powder corresponding to each object in the image dataset;

[0031] Based on each area fraction, obtain the average area fraction, maximum area fraction, minimum area fraction, and standard deviation of the area fraction, and obtain the fractal box dimension;

[0032] The weight matrix corresponding to the average area fraction, the maximum area fraction, the minimum area fraction, the standard deviation of the area fraction, and the fractal box dimension are obtained by using the analytic hierarchy process.

[0033] The quality test results of the water-blocking powder of the water-blocking tape to be tested are generated based on the average area fraction, the maximum area fraction, the minimum area fraction, the standard deviation of the area fraction, the fractal box dimension, and the corresponding weight matrix.

[0034] Preferably, after generating the quality test result of the water-blocking powder of the water-blocking tape to be tested based on the image data, the method further includes:

[0035] Obtain the quality testing threshold for water-blocking powder;

[0036] Determine whether the value of the quality test result is higher than the quality test threshold of the water-blocking powder;

[0037] If so, then the quality of the water-blocking powder in the water-blocking tape to be tested is confirmed to be qualified.

[0038] The water-blocking powder quality testing device provided in this application includes a water-blocking tape peeling device, a charge-coupled imaging module, and an image processing module. The water-blocking tape peeling device is used to peel off the water-blocking tape to be tested to obtain the water-blocking powder layer of the water-blocking tape. The charge-coupled imaging module is communicatively connected to the image processing module and is used to acquire images of the water-blocking powder in the water-blocking powder layer and transmit the image data to the image processing module. The image processing module is used to generate the quality testing result of the water-blocking powder of the water-blocking tape to be tested based on the image data. Therefore, the above scheme obtains the water-blocking powder layer by peeling off the water-blocking tape to be tested using the water-blocking tape peeling device, acquires images of the water-blocking powder in the water-blocking powder layer using the charge-coupled imaging module, and generates the quality testing result of the water-blocking powder based on the image data using the image processing module. It utilizes image processing technology to achieve water-blocking powder quality testing, which has the advantage of repeatability and saves labor and time costs. At the same time, it can continuously test the water-blocking powder of the water-blocking tape, avoiding errors in the test results due to differences in the distribution of the water-blocking powder in the water-blocking tape, and improving the detection accuracy.

[0039] In addition, this application also provides a method for testing the quality of water-blocking powder, with the same effect as above. Attached Figure Description

[0040] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a structural diagram of the semi-conductive buffer water-blocking strip provided in an embodiment of this application;

[0042] Figure 2 A schematic diagram of a water-blocking powder quality testing device provided in an embodiment of this application;

[0043] Figure 3 A schematic diagram of another water-blocking powder quality testing device provided in the embodiments of this application;

[0044] Figure 4 This is a flowchart of a water-blocking powder quality testing method provided in an embodiment of this application.

[0045] Among them, 5 is a non-woven fabric layer, 6 is a water-blocking powder layer, 7 is a fluffy cotton layer, 10 is a water-blocking tape peeling device, 11 is a charge-coupled imaging module, 12 is an image processing module, 13 is a microscopic magnification module, 14 is a parallel light source, 101 is a first roller, 102 is a second roller, 103 is a third roller, 104 is a fourth roller, and 105 is a light-shielding plate. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0047] The core of this application is to provide a device and method for testing the quality of water-blocking powder in high-voltage cables, so as to better realize the quality testing of water-blocking powder in high-voltage cable water-blocking tape.

[0048] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Figure 1 This is a structural diagram of the semi-conductive buffer water-blocking strip provided in an embodiment of this application. Figure 1 As shown, the semi-conductive buffer water-blocking tape consists of a non-woven fabric layer 5, a water-blocking powder layer 6, and a fluffy cotton layer 7. The water-blocking powder is generally sodium polyacrylate, which expands rapidly in volume when absorbing water. In the presence of moisture, the water-blocking powder gradually forms non-conductive sodium salts under the influence of an electric field, gradually deteriorating the insulation and leading to buffer layer ablation failure. The ablation defects of high-voltage cable buffer layers have attracted widespread attention due to their harmfulness. Cable manufacturers, power companies, and universities have begun to promote research on the quality testing technology of high-voltage cable buffer layer water-blocking tape materials, hoping to control the quality of water-blocking tapes in high-voltage cables during sampling and grid connection testing to ensure excellent performance during subsequent operation.

[0050] Currently, the quality testing of water-blocking tape generally refers to the JB / T 10259 standard. This standard specifies the main parameters for quality testing of water-blocking tape, including volume resistivity, surface resistivity, tensile strength, expansion rate, and expansion height. Among these, the expansion rate and expansion height are the main parameters related to the water-blocking performance of water-blocking tape in JB / T 10259. However, since JB / T 10259 is primarily designed for optical cables, not high-voltage cables, its testing methods and result evaluation standards may not be applicable. Furthermore, the testing methods based on expansion rate and expansion height in JB / T 10259 are irreversible and non-repeatable; once moisture is added to the buffer layer of the water-blocking tape for testing, the sample is destroyed and cannot be restored after drying, making it impossible to verify the test results. Based on these problems, this application provides a water-blocking powder quality testing device to better realize the quality testing of water-blocking powder in high-voltage cable water-blocking tape.

[0051] Figure 2 This is a schematic diagram of a water-blocking powder quality testing device provided in an embodiment of this application. Figure 2As shown, the device includes: a water-blocking stripping device 10, a charge-coupled imaging module 11, and an image processing module 12;

[0052] The water-blocking tape peeling device 10 is used to peel off the water-blocking tape to be tested in order to obtain the water-blocking powder layer 6 of the water-blocking tape to be tested.

[0053] The charge-coupled imaging module 11 is communicatively connected to the image processing module 12, and is used to acquire images of the water-blocking powder in the water-blocking powder layer 6 and transmit the image data to the image processing module 12.

[0054] The image processing module 12 is used to generate the quality test results of the water-blocking powder of the water-blocking tape to be tested based on the image data.

[0055] The water-blocking powder quality testing device provided in this embodiment includes a water-blocking tape peeling device 10, a charge-coupled imaging module 11, and an image processing module 12. The water-blocking tape peeling device 10 is used to peel off the water-blocking tape to be tested to obtain the water-blocking powder layer 6 of the water-blocking tape. It can be understood that in this embodiment, the function of the water-blocking tape peeling device 10 is to peel off the layers of the water-blocking tape to be tested. Since the water-blocking tape to be tested has a three-layer structure, namely a non-woven fabric layer 5, a water-blocking powder layer 6, and a fluffy cotton layer 7, with the water-blocking powder layer 6 located between the other two layers, it is necessary to peel off the water-blocking tape to obtain the water-blocking powder layer 6 in order to achieve quality testing of the water-blocking powder in the water-blocking powder layer 6.

[0056] It is important to note that because the water-blocking powder in the water-blocking powder layer 6 consists of micron-sized particles, and because a semi-conductive adhesive is placed between the nonwoven fabric layer 5 and the fluffy cotton layer 7, the water-blocking powder layer 6 will adhere to the nonwoven fabric layer 5 during the peeling of the water-blocking tape to be tested. In other words, the peeling of the water-blocking tape actually divides the nonwoven fabric layer 5, the water-blocking powder layer 6, and the fluffy cotton layer 7 into two parts: the nonwoven fabric layer 5 and the water-blocking powder layer 6 form one part, and the fluffy cotton layer 7 forms the other.

[0057] Furthermore, in this embodiment, the specific structure of the water-blocking tape peeling device 10 is not limited, as long as it can peel off the water-blocking tape to be tested to obtain the water-blocking powder layer 6, depending on the specific implementation.

[0058] The charge-coupled device (CCD) is communicatively connected to the image processing module 12. It is used to acquire images of the water-blocking powder in the water-blocking powder layer 6 and transmit the image data to the image processing module 12. Understandably, when performing water-blocking powder quality inspection, the CCD acquires images of the water-blocking powder layer 6 peeled off by the water-blocking stripping device 10 and transmits the acquired image data to the image processing module 12. In this embodiment, there are no restrictions on the size of the images of the water-blocking powder layer 6 acquired by the CCD, the number of images acquired, the time interval between acquisitions, or the total acquisition time. Users can adjust these parameters according to actual quality inspection needs, depending on the specific implementation. Furthermore, this embodiment does not restrict the relative position of the CCD and the peeled-off water-blocking powder layer 6, as long as the CCD can adequately capture the water-blocking powder in the water-blocking powder layer 6, depending on the specific implementation.

[0059] The image processing module 12 receives image data transmitted by the charge-coupled imaging module 11, processes the received image data of the water-blocking powder, and generates a corresponding quality inspection result of the water-blocking powder based on the processed image data. In this embodiment, the specific image processing procedure and the generation process of the quality inspection result by the image processing module 12 are not limited; they depend on the specific implementation.

[0060] In this embodiment, the water-blocking powder quality detection device includes a water-blocking tape peeling device, a charge-coupled imaging module, and an image processing module. The water-blocking tape peeling device is used to peel off the water-blocking tape to be tested to obtain the water-blocking powder layer of the water-blocking tape. The charge-coupled imaging module is communicatively connected to the image processing module and is used to acquire images of the water-blocking powder in the water-blocking powder layer and transmit the image data to the image processing module. The image processing module is used to generate the quality detection result of the water-blocking powder of the water-blocking tape to be tested based on the image data. Therefore, the above scheme obtains the water-blocking powder layer by peeling off the water-blocking tape to be tested using the water-blocking tape peeling device, acquires images of the water-blocking powder in the water-blocking powder layer using the charge-coupled imaging module, and generates the quality detection result of the water-blocking powder based on the image data using the image processing module. It utilizes image processing technology to achieve water-blocking powder quality detection, which has the advantage of repeatability and saves labor and time costs. At the same time, it can continuously detect the water-blocking powder in the water-blocking tape, avoiding errors in the detection results due to differences in the distribution of the water-blocking powder in the water-blocking tape, and improving the detection accuracy.

[0061] Figure 3 This is a schematic diagram of another water-blocking powder quality detection device provided in an embodiment of this application. In order to continuously acquire images of the water-blocking powder layer 6, it is necessary to continuously peel off the water-blocking powder layer 6 of the water-blocking strip. Therefore, based on the above embodiments, as a preferred embodiment, such as... Figure 3 As shown, the water-blocking tape stripping device 10 includes: a first roller 101, a second roller 102, a third roller 103 and a fourth roller 104;

[0062] The third roller 103 is disposed between the first roller 101 and the fourth roller 104; the axis of the first roller 101, the axis of the third roller 103 and the axis of the fourth roller 104 are parallel to each other; the plane formed by the axis of the first roller 101, the axis of the third roller 103 and the axis of the fourth roller 104 is parallel to the image acquisition plane.

[0063] The second roller 102 is positioned above the fourth roller 104; the axis of the second roller 102 is parallel to the axis of the fourth roller 104; the plane formed by the axis of the second roller 102 and the axis of the fourth roller 104 is perpendicular to the image acquisition plane.

[0064] The angular velocity of the first roller 101 when it rotates is the same as that of the second roller 102 when it rotates, but in opposite directions;

[0065] The image acquisition plane is the plane where the peeled water-blocking powder layer 6 is located; the vertical projection of the charge-coupled imaging module 11 is on the upper surface of the image acquisition plane.

[0066] It is understood that the water-blocking tape peeling device 10 in this embodiment includes four rollers. The first roller 101 is used to peel off and fix the non-woven fabric layer 5 and the water-blocking powder layer 6 of the water-blocking tape under test during rotation; the second roller 102 is used to peel off and fix the fluffy cotton layer 7 of the water-blocking tape under test during rotation; the third roller 103 and the fourth roller 104 are used to fix the water-blocking tape under test. Specifically, during the quality inspection of the water-blocking powder, the non-woven fabric layer 5 at the end of the water-blocking tape under test is fixed to the first roller 101, and the fluffy cotton layer 7 is fixed to the second roller 102; when the first roller 101 and the second roller 102 rotate respectively, the non-woven fabric layer 5 and the fluffy cotton layer 7 are respectively wrapped and fixed onto the first roller 101 and the second roller 102, thus achieving the peeling off of the water-blocking powder layer 6 under test. Since the water-blocking powder layer 6 adheres to the non-woven fabric layer 5, the water-blocking powder layer 6 and the non-woven fabric layer 5 are wrapped and fixed together on the first roller 101, thereby continuously peeling off the water-blocking powder layer 6. The peeled-off water-blocking powder layer 6 is located on the image acquisition plane.

[0067] It should be noted that, in order to facilitate better peeling of the water-blocking tape under test, the angular velocity of the first roller 101 is the same as, but opposite in direction to, the angular velocity of the second roller 102. This allows for smoother and more continuous winding and fixing of the non-woven fabric layer 5 and the fluffy cotton layer 7. Furthermore, to ensure a more stable peeling process between the non-woven fabric layer 5 and the fluffy cotton layer 7, the water-blocking tape under test is also secured by the third roller 103 and the fourth roller 104. It is understandable that... Figure 3As shown, the third roller 103 and the fourth roller 104 can rotate along with the first roller 101 and the second roller 102. While rotating, they cooperate to clamp the water-blocking tape under test, thus fixing the tape in place. In practice, the user can also adjust the distance between the third roller 103 and the fourth roller 104 according to actual needs, thereby adjusting the firmness of the fixation of the water-blocking tape.

[0068] It should also be noted that when performing quality testing of the water-blocking powder, the non-woven fabric layer 5 at the end of the water-blocking tape to be tested needs to be fixed to the first roller 101, and the fluffy cotton layer 7 needs to be fixed to the second roller 102. In this embodiment, the specific fixing method is not limited. The non-woven fabric layer 5 can be bonded to the first roller 101, and the fluffy cotton layer 7 can be bonded to the second roller 102. Alternatively, needles can be provided on the outer walls of both the first roller 101 and the second roller 102 to hang the non-woven fabric layer 5 and the fluffy cotton layer 7 on the first roller 101 and the second roller 102 respectively, depending on the specific implementation. This achieves continuous peeling of the water-blocking powder layer 6 of the water-blocking tape to be tested, facilitating continuous image acquisition of the water-blocking powder layer 6.

[0069] To achieve clearer images of the water-blocking powder and facilitate image data processing, a preferred embodiment is proposed based on the above embodiments, such as... Figure 3 As shown, the water-blocking stripping device 10 also includes a light-shielding plate 105;

[0070] The light-shielding plate 105 is disposed on the lower surface of the image acquisition plane.

[0071] In practice, the water-blocking tape peeling device 10 peels off the water-blocking tape to be tested, obtaining the water-blocking powder layer 6. Since the water-blocking powder particles in the water-blocking powder layer 6 are white and the polyester fibers in the non-woven layer 5 are black, in order for the charge-coupled imaging module 11 to better acquire the water-blocking powder image, a light-shielding plate 105 needs to be placed on the lower surface of the image acquisition plane, opposite to the charge-coupled imaging module 11, thereby blocking light from passing through the peeled non-woven layer 5 and the water-blocking powder layer 6, while matching the color of the polyester fibers; this not only makes the acquired image clearer, but also allows the generated image data to be better binarized.

[0072] In order to acquire clearer images of the water-blocking powder, based on the above embodiments, as a preferred embodiment, the device further includes: a microscopic magnification module 13;

[0073] The microscopic magnification module 13 is connected to the charge-coupled imaging module 11 and is used to magnify the image when the charge-coupled imaging module 11 acquires an image of the water-blocking powder in the water-blocking powder layer 6.

[0074] In a specific implementation, the microscopic magnification module 13 is connected to the charge-coupled imaging module 11 as an auxiliary device. It magnifies the image when the charge-coupled imaging module 11 acquires an image of the water-blocking powder in the water-blocking powder layer 6, thereby allowing the charge-coupled imaging module 11 to acquire a clearer image of the water-blocking powder. In this embodiment, the specific magnification of the microscopic magnification module 13 is not limited and depends on the specific implementation.

[0075] In addition, to further improve the image clarity of the water-blocking powder, as a preferred embodiment, the device also includes: a parallel light source 14; the parallel light source 14 is disposed on the micro-magnification module 13, and the parallel light emitted by the parallel light source 14 is perpendicular to the image acquisition plane, which is used to enhance the brightness of the image when the charge-coupled imaging module 11 acquires the image of the water-blocking powder in the water-blocking powder layer 6.

[0076] Figure 4 This is a flowchart illustrating a method for testing the quality of water-blocking powder, provided in an embodiment of this application. The method is applied to the aforementioned water-blocking powder quality testing device; as... Figure 4 As shown, the method includes:

[0077] S10: Receive image data of the water-blocking powder in the water-blocking powder layer of the water-blocking strip under test, acquired by the charge-coupled imaging module.

[0078] S11: Generate the quality test results of the water-blocking powder of the water-blocking tape to be tested based on the image data.

[0079] In practical implementation, when conducting water-blocking powder quality testing, the water-blocking tape to be tested is peeled off using a water-blocking tape peeling device to obtain the water-blocking powder layer of the water-blocking tape. Further, an image of the water-blocking powder in the water-blocking powder layer is acquired using a charge-coupled imaging (CCIE) module, and the image data is transmitted to an image processing module. The image processing module receives the image data of the water-blocking powder in the water-blocking powder layer of the water-blocking tape acquired by the CCIE module and generates the quality testing result of the water-blocking powder in the water-blocking tape based on the image data. This solution utilizes image processing technology to achieve water-blocking powder quality testing, offering the advantage of repeatability and saving labor and time costs. Simultaneously, it enables continuous testing of the water-blocking powder in the water-blocking tape, avoiding errors in the test results due to differences in the distribution of the water-blocking powder, thus improving the testing accuracy.

[0080] In order to continuously monitor the quality of water-blocking powder, based on the above embodiments, as a preferred embodiment, the image data of the water-blocking powder in the water-blocking powder layer of the water-blocking strip under test acquired by the charge-coupled imaging module includes:

[0081] S100: Receives multiple sets of image data of water-blocking powder in the water-blocking powder layer acquired by the charge-coupled imaging module at a preset period.

[0082] In practical implementation, as the water-blocking tape peeling device gradually peels off the water-blocking tape, the charge-coupled imaging module collects multiple sets of image data of the water-blocking powder layer at preset intervals, so as to continuously detect the quality of the water-blocking powder through multiple sets of image data. It is understood that the preset interval is not limited in this embodiment and depends on the specific implementation. In some embodiments, the preset interval is related to the size of the acquired image and the angular velocity of the roller: for example, when multiple sets of m×n size images need to be acquired, the images of the water-blocking powder are acquired at a preset interval of m / v. Here, v is the moving speed of the water-blocking tape to be tested, which is positively correlated with the angular velocity of the roller.

[0083] To better generate quality inspection results for the water-blocking powder, based on the above embodiments, as a preferred embodiment, before generating the quality inspection results of the water-blocking powder of the water-blocking tape to be tested based on image data, the following is also included:

[0084] S12: Select sub-images of preset size from each group of image data as objects in the image dataset.

[0085] S13: Perform grayscale conversion, wavelet denoising, image enhancement, and binarization on each object in the image dataset in sequence.

[0086] In practice, sub-images of a preset size are selected from each set of collected water-blocking powder image data as objects in the image dataset. Further image processing is performed on each object in the image dataset, including grayscale conversion, wavelet denoising, and histogram equalization for contrast enhancement. Then, an adaptive thresholding method is used to binarize the resulting grayscale image. Finally, a closing operation is performed on the binary image to fill gaps and micropores, resulting in the processed objects. This image processing makes the water-blocking powder information in the object sub-images clearer and more prominent, leading to better quality inspection results for the water-blocking powder.

[0087] Based on the above embodiments, as a preferred embodiment, the quality inspection result of the water-blocking powder of the water-blocking tape to be tested, generated according to the image data, includes:

[0088] S110: Obtain the area fraction of water-blocking powder corresponding to each object in the image dataset.

[0089] The area fraction of water-resistant powder was statistically analyzed for each object after image processing. The area fraction of water-resistant powder for the i-th object is as follows:

[0090]

[0091] S111: Obtain the average, maximum, minimum, and standard deviation of the area fractions based on each area fraction, and obtain the fractal box dimension.

[0092] Further, based on each area fraction Ai, we obtain the average area fraction Amean, the maximum area fraction Amax, the minimum area fraction Amin, and the standard deviation of the area fraction σ, and obtain the fractal box dimension D.

[0093] It is important to note that the uniformity of particle distribution is evaluated by the dimensionless standard deviation of the particle area fraction Ai, which is the area fraction standard deviation σ, for measuring the particle area fraction Ai in n random fields of view in the acquired image.

[0094]

[0095] In this embodiment, box counting is used to calculate irregular fractals. Specifically, a box of size r is placed over the acquired image, and the number of pixels containing target particles in each grid is obtained, N(r). Then, the value of r is gradually decreased, and the corresponding number of grids N(r) is calculated. If... If the fitting result is a straight line, it means that N(r) and r satisfy the following relationship:

[0096]

[0097] If there is scale invariance within the measure range of the fitted straight line, then the slope D of the line is the fractal dimension of the box-counting method. The size of the box-counting dimension represents the uniformity of the particle distribution in the measured image. The more uniform the particle distribution in the measured image, the closer the box-counting dimension is to the topological dimension 2 of the planar image.

[0098] S112: Obtain the weight matrix corresponding to the average area fraction, the weight matrix corresponding to the maximum area fraction, the weight matrix corresponding to the minimum area fraction, the weight matrix corresponding to the standard deviation of the area fraction, and the weight matrix corresponding to the fractal box dimension through the analytic hierarchy process.

[0099] Furthermore, the weight matrix corresponding to the average area fraction, the maximum area fraction, the minimum area fraction, the standard deviation of the area fraction, and the fractal box dimension were obtained by using the Analytic Hierarchy Process (AHP).

[0100] Understandably, the Analytic Hierarchy Process (AHP) is a multi-objective decision analysis method that combines qualitative and quantitative analysis. Its main idea is to decompose a complex problem into several levels and factors, compare the importance of each pair of indicators, establish a judgment matrix, and calculate the weights of different options' importance by calculating the largest eigenvalue and corresponding eigenvector of the judgment matrix, thus providing a basis for selecting the optimal solution. In this embodiment, the weight matrix for each indicator is [a1, a2, a3, a4, a5].

[0101] S113: Generate the quality test results of the water-blocking powder of the water-blocking tape to be tested based on the average area fraction, maximum area fraction, minimum area fraction, standard deviation of area fraction, fractal box dimension, and their respective weight matrices.

[0102] Finally, the quality test results of the water-blocking powder of the water-blocking tape to be tested are generated based on the average area fraction Amean, maximum area fraction Amax, minimum area fraction Amin, standard deviation of area fraction σ, fractal box dimension D, and their respective weight matrices [a1,a2,a3,a4,a5].

[0103] S=a1×Amean+a2×Amax+a3×(1-Amin)+a4×Amean / σ+a5×D / 2;

[0104] Where S represents the quality test result of the water-blocking powder.

[0105] In this way, the quality test results of the water-blocking powder of the water-blocking tape to be tested were generated.

[0106] To determine whether the water-blocking performance of the water-blocking tape under test meets the standard, based on the above embodiments, as a preferred embodiment, after generating the quality inspection result of the water-blocking powder of the water-blocking tape under test according to the image data, the following is also included:

[0107] S14: Obtain the quality detection threshold for water-blocking powder.

[0108] S15: Determine whether the value of the quality test result is higher than the water-blocking powder quality test threshold; if so, confirm that the water-blocking powder quality test of the water-blocking tape to be tested is qualified.

[0109] In specific implementation, the quality detection threshold of the water-blocking powder can be evaluated by experts according to the expert scoring method. When the numerical score of the quality detection result obtained by testing is higher than this threshold, it is considered qualified; otherwise, it is considered unqualified. In specific implementation, the relative comparison of the quality of the water-blocking powder in the buffer layer of different manufacturers can also be made according to the quality detection result. Another feasible solution is as follows: conduct a water-blocking performance test on M water-blocking tape samples, record the length of water intrusion. If the 24-hour intrusion length of N samples is 0.5 m, then take the average value of the quality detection results S of these N samples as the evaluation threshold. When the result score is higher than this threshold, it is considered qualified; otherwise, it is considered unqualified.

[0110] The above has introduced in detail a device and method for detecting the quality of water-blocking powder provided by the present application. The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0111] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

Claims

1. A method for quality testing of water-blocking powder, characterized in that, include: Receive image data of water-blocking powder in the water-blocking powder layer of the water-blocking strip under test, acquired by the charge-coupled imaging module; The quality test result of the water-blocking powder of the water-blocking tape to be tested is generated based on the image data; The image data of the water-blocking powder in the water-blocking powder layer of the water-blocking strip to be tested, acquired by the charge-coupled imaging module, includes: Receive multiple sets of image data of the water-blocking powder in the water-blocking powder layer, which are acquired by the charge-coupled imaging module at a preset period; Before generating the quality test result of the water-blocking powder of the water-blocking tape to be tested based on the image data, the method further includes: Each sub-image of a preset size is selected from the image data in each group as an object in the image dataset; Each object in the image dataset is sequentially subjected to grayscale conversion, wavelet denoising, image enhancement, and binarization. The quality detection result of the water-blocking powder generated based on the image data for the water-blocking tape to be tested includes: Obtain the area fraction of the water-blocking powder corresponding to each object in the image dataset; Based on each area fraction, obtain the average area fraction, maximum area fraction, minimum area fraction, and standard deviation of the area fraction, and obtain the fractal box dimension; The weight matrix corresponding to the average area fraction, the maximum area fraction, the minimum area fraction, the standard deviation of the area fraction, and the fractal box dimension are obtained by using the analytic hierarchy process. The quality test results of the water-blocking powder of the water-blocking tape to be tested are generated based on the average area fraction, the maximum area fraction, the minimum area fraction, the standard deviation of the area fraction, the fractal box dimension, and the corresponding weight matrix.

2. The method for testing the quality of water-blocking powder according to claim 1, characterized in that, After generating the quality test result of the water-blocking powder of the water-blocking tape to be tested based on the image data, the method further includes: Obtain the quality testing threshold for water-blocking powder; Determine whether the value of the quality test result is higher than the quality test threshold of the water-blocking powder; If so, then the quality of the water-blocking powder in the water-blocking tape to be tested is confirmed to be qualified.

3. The method for testing the quality of water-blocking powder according to claim 1, characterized in that, The method is applied to a water-blocking powder quality testing device, which includes: a water-blocking tape peeling device, a charge-coupled imaging module, and an image processing module. The water-blocking tape peeling device is used to peel off the water-blocking tape to be tested in order to obtain the water-blocking powder layer of the water-blocking tape to be tested. The charge-coupled imaging module is communicatively connected to the image processing module and is used to acquire images of the water-blocking powder in the water-blocking powder layer and transmit the image data to the image processing module. The image processing module is used to generate the quality test result of the water-blocking powder of the water-blocking tape to be tested based on the image data.

4. The method for testing the quality of water-blocking powder according to claim 3, characterized in that, The water-blocking stripping device includes: a first roller, a second roller, a third roller, and a fourth roller; The third roller is disposed between the first roller and the fourth roller; the axes of the first roller, the third roller, and the fourth roller are parallel to each other; the plane formed by the axes of the first roller, the third roller, and the fourth roller is parallel to the image acquisition plane. The second roller is positioned above the fourth roller; the axis of the second roller is parallel to the axis of the fourth roller; the plane formed by the axis of the second roller and the axis of the fourth roller is perpendicular to the image acquisition plane. The angular velocity of the first roller when it rotates is the same as that of the second roller when it rotates, but in opposite directions; The image acquisition plane is the plane on which the water-blocking powder layer is peeled off; the vertical projection of the charge-coupled imaging module is onto the upper surface of the image acquisition plane.

5. The method for testing the quality of water-blocking powder according to claim 4, characterized in that, The water-blocking stripping device also includes a light-shielding plate; The light-shielding plate is disposed on the lower surface of the image acquisition plane.

6. The method for quality testing of water-blocking powder according to claim 3, characterized in that, The water-blocking powder quality testing device also includes: a micro-magnification module; The microscopic magnification module is connected to the charge-coupled imaging module and is used to magnify the image when the charge-coupled imaging module acquires the image of the water-blocking powder in the water-blocking powder layer.

7. The method for testing the quality of water-blocking powder according to claim 6, characterized in that, The water-blocking powder quality testing device also includes: a parallel light source; The parallel light source is positioned on the microscopic magnification module, and the parallel light emitted by the parallel light source is perpendicular to the image acquisition plane.

Images