A sinter screen integrity detection method and system

Abstract

The application belongs to the technical field of detection, and discloses a sintering screen integrity detection method and system; the method comprises the following steps: installing a measured sintering screen into a test tank body, and injecting a test liquid into a liquid cavity; gradually increasing the air pressure of an air cavity; after increasing the air pressure once, maintaining the pressure for a preset time, and then collecting an overall image of the liquid cavity; a host computer obtains the positions of multiple bubble points according to the overall image, determines the air pressure when each bubble point starts to bubble, and controls an image module to collect local microscopic images of each bubble point; the host computer calculates the first aperture of each bubble point according to the air pressure when each bubble point starts to bubble, obtains the second aperture of each bubble point according to the local microscopic images of each bubble point, and calculates the effective aperture of each bubble point according to the first aperture and the second aperture; the host computer judges whether the aperture of the measured sintering screen is qualified according to the effective aperture of each bubble point; thereby, the degree of automation is high, the detection efficiency is high, and the accuracy of the detection result is improved.

Description

Technical Field

[0001] This application relates to the field of testing technology, and more specifically, to a method and system for testing the integrity of sintered mesh. Background Technology

[0002] Sintered mesh (also known as multi-metal sintered mesh) is a filter material made of multi-layered woven metal wire mesh through special processes such as lamination pressing and vacuum sintering. It has excellent filtration accuracy, filtration resistance, mechanical strength, wear resistance, heat resistance and processability.

[0003] Before leaving the factory, sintered mesh needs to be sampled for integrity testing to determine whether the product pore size is qualified. The bubble test method is usually used for integrity testing. Currently, bubble testing is generally done manually (including data recording, pore size calculation, etc.), which has a low degree of automation and low efficiency. Moreover, the pore size test results are obtained entirely from theoretical calculations, resulting in low accuracy of the test results. Summary of the Invention

[0004] The purpose of this application is to provide a method and system for detecting the integrity of sintered mesh, which has a high degree of automation, high detection efficiency, and helps to improve the accuracy of detection results.

[0005] In a first aspect, this application provides a sintered mesh integrity detection system, including a host computer, a bubble testing device, a gas supply device, and an image module, wherein the gas supply device and the image module are both electrically connected to the host computer;

[0006] The bubble testing device includes a test tank for mounting the sintered mesh under test. The inner cavity of the test tank is divided by the sintered mesh under test into a liquid cavity located above the sintered mesh and a gas cavity located below the sintered mesh. The liquid cavity is used to hold the test liquid, and the gas cavity is connected to the gas supply device, which is used to supply gas to the gas cavity to regulate the gas pressure in the gas cavity. A gas pressure sensor is installed in the gas cavity and is electrically connected to the host computer.

[0007] The image module is positioned above the liquid cavity and is used to acquire an overall image of the liquid cavity and a local microscopic image of the bubbling point of the sintered mesh under test.

[0008] The host computer is used to calculate the effective aperture of the bubbling point based on the overall image and local microscopic image acquired by the image module and the air pressure measured by the air pressure sensor, so as to determine whether the aperture of the sintered mesh under test is qualified.

[0009] During use, the host computer automatically adjusts the air pressure, acquires images, and measures the air pressure through the air supply device, image module, and air pressure sensor. Then, the host computer automatically calculates the effective pore size of the bubbling point and judges the pore size qualification of the sintered mesh under test based on the acquired images and air pressure. It has a high degree of automation and high detection efficiency. Furthermore, the calculation of the effective pore size of the bubbling point by combining local microscopic images helps to improve the accuracy of the detection results.

[0010] Preferably, the image module includes a CCD camera, a microscope imaging device, and a three-axis motion mechanism for driving the CCD camera and the microscope imaging device to move; the CCD camera is used to acquire an overall image of the liquid cavity; the microscope imaging device is used to acquire local microscopic images of the bubbling points of the sintered mesh under test.

[0011] Preferably, the test tank includes a lower tank and an upper tank. The inner wall of the lower tank is provided with an internal thread and a limiting ring, with the limiting ring positioned below the internal thread. The outer wall of the upper tank is provided with an external thread adapted to the internal thread. The upper tank is connected to the internal thread via the external thread and presses the edge of the sintered mesh under test against the limiting ring. The sintered mesh under test and the lower tank form the gas cavity, and the upper tank and the sintered mesh under test form the liquid cavity.

[0012] This facilitates the assembly and disassembly of the sintered mesh under test and reliably ensures that the sintered mesh under test is effectively fixed during the testing process, avoiding displacement and leakage of the sintered mesh due to increased gas pressure in the gas chamber.

[0013] Preferably, the lower end face of the upper groove is a Z-shaped end face composed of a first horizontal end face, a first vertical end face, and a second horizontal end face. The first horizontal end face abuts against the upper surface of the edge of the sintered mesh being tested, the first vertical end face abuts against the circumferential surface of the edge of the sintered mesh being tested, and the second horizontal end face abuts against the upper surface of the limiting ring.

[0014] Preferably, a sealing gasket layer is provided on the lower end face of the upper tank.

[0015] This allows for effective positioning of the sintered mesh under test, while also reliably sealing the edges of the sintered mesh to prevent gas leakage from the edges of the sintered mesh and thus avoid affecting the test results.

[0016] Preferably, the bubble testing device further includes a liquid storage tank disposed below the test tank, and a drain port is provided at the lower end of the lower tank. The drain port is equipped with an electromagnetic valve, and the electromagnetic valve is electrically connected to the upper host computer.

[0017] Preferably, the limiting ring has a liquid passage hole that passes through the upper and lower surfaces of the limiting ring at a position opposite to the second horizontal end face.

[0018] Preferably, the lower tank is provided with two horizontal end shafts, which are coaxially arranged on both sides of the lower tank and are rotatably connected to the liquid storage tank; one of the horizontal end shafts is connected to a motor, which is electrically connected to the upper computer and used to drive the test tank to reciprocate.

[0019] Therefore, after each air pressure adjustment, the test tank can be swung back and forth before image acquisition, so as to avoid the air bubbles being undetectable due to their adhesion to the surface of the sintered mesh being tested, thus affecting the accuracy of the test results.

[0020] Secondly, this application provides a method for detecting the integrity of sintered mesh, based on the sintered mesh integrity detection system described above, including the following steps:

[0021] A1. Install the sintered mesh to be tested into the test tank and inject the test liquid into the liquid chamber;

[0022] A2. Gas is supplied to the air chamber using a gas supply device to gradually increase the air pressure in the air chamber;

[0023] A3. After each increase in air pressure, maintain the pressure for a preset time, and then acquire an overall image of the liquid chamber through the image module;

[0024] A4. The host computer obtains the positions of multiple bubbling points based on the overall image, determines the air pressure when each bubbling point starts bubbling, and controls the image module to acquire local microscopic images of each bubbling point based on the position of each bubbling point.

[0025] A5. The host computer calculates the first aperture of each bubbling point based on the air pressure when each bubbling point starts bubbling, obtains the second aperture of each bubbling point based on the local microscopic image of each bubbling point, and calculates the effective aperture of each bubbling point based on the first aperture and the second aperture.

[0026] A6. The host computer determines whether the aperture of the sintered mesh being tested is qualified based on the effective aperture of each bubbling point.

[0027] The host computer automatically adjusts the air pressure, acquires images, and measures the air pressure through the air supply device, image module, and air pressure sensor. Then, the host computer automatically calculates the effective pore size of the bubbling point and judges the pore size qualification of the tested sintered mesh based on the acquired images and air pressure. It has a high degree of automation and high detection efficiency. Furthermore, the calculation of the effective pore size of the bubbling point by combining the first pore size obtained by theoretical calculation and the second pore size obtained by local microscopic image recognition helps to improve the accuracy of the detection results.

[0028] Preferably, in step A3, the test tank is oscillated back and forth during the pressure holding process.

[0029] Beneficial effects:

[0030] The sintered mesh integrity detection method and system provided in this application automatically adjusts the air pressure, acquires images, and measures the air pressure through a host computer via an air supply device, an image module, and an air pressure sensor. Then, the host computer automatically calculates the effective pore size of the bubbling point and judges the pore size qualification of the sintered mesh under test based on the acquired images and air pressure. It has a high degree of automation and high detection efficiency. Furthermore, the calculation of the effective pore size of the bubbling point by combining local microscopic images helps to improve the accuracy of the detection results. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the sintered mesh integrity detection system provided in an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the bubble testing device.

[0033] Figure 3 for Figure 2 A magnified view of the S-shaped section.

[0034] Figure 4 A flowchart of the sintered mesh integrity detection method provided in the embodiments of this application.

[0035] Labeling Explanation: 1. Host Computer; 2. Bubble Testing Device; 3. Gas Supply Device; 4. Image Module; 401. CCD Camera; 402. Microscope Imaging Device; 403. Three-Axis Moving Mechanism; 5. Test Tank; 501. Liquid Chamber; 502. Gas Chamber; 503. Lower Tank; 504. Upper Tank; 5041. First Horizontal End Face; 5042. First Vertical End Face; 5043. Second Horizontal End Face; 505. Limiting Ring; 5051. Liquid Passing Hole; 506. Sealing Gasket; 507. Drain Port; 508. Solenoid Valve; 509. Horizontal End Shaft; 6. Pressure Sensor; 7. Liquid Storage Tank; 701. Discharge Port; 8. Motor; 9. Rotary Joint; 90. Sintered Mesh Under Test. Detailed Implementation

[0036] 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. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Please refer to Figures 1-3 A sintered mesh integrity detection system in some embodiments of this application includes a host computer 1, a bubble testing device 2, a gas supply device 3, and an image module 4. The gas supply device 3 and the image module 4 are both electrically connected to the host computer 1.

[0039] The bubble testing device 2 includes a test tank 5 for mounting the sintered mesh 90 to be tested. The inner cavity of the test tank 5 is divided by the sintered mesh 90 to be tested into a liquid chamber 501 located on the upper side of the sintered mesh 90 and a gas chamber 502 located on the lower side of the sintered mesh 90. The liquid chamber 501 is used to hold the test liquid, and the gas chamber 502 is connected to a gas supply device 3. The gas supply device 3 is used to supply gas to the gas chamber 502 to regulate the gas pressure of the gas chamber 502. A gas pressure sensor 6 is installed in the gas chamber 502, and the gas pressure sensor 6 is electrically connected to the host computer 1.

[0040] Image module 4 is positioned above liquid cavity 501 and is used to acquire an overall image of liquid cavity 501 and a local microscopic image of the bubbling point of the sintered mesh 90 under test.

[0041] The host computer 1 is used to calculate the effective aperture of the bubbling point based on the overall image and local microscopic image acquired by the image module 4 and the air pressure measured by the air pressure sensor 6, so as to determine whether the aperture of the sintered mesh 90 being tested is qualified.

[0042] During use (refer to the sintered mesh integrity detection method below for specific usage methods), the host computer 1 automatically adjusts the air pressure, acquires images, and measures the air pressure through the air supply device 3, image module 4, and air pressure sensor 6. Then, the host computer 1 automatically calculates the effective pore size of the bubbling point and judges the pore size qualification of the tested sintered mesh 90 based on the acquired images and air pressure. It has a high degree of automation and high detection efficiency. Furthermore, the calculation of the effective pore size of the bubbling point by combining local microscopic images helps to improve the accuracy of the detection results.

[0043] The host computer 1 can be, but is not limited to, a tablet computer, a laptop computer, a desktop computer, a minicomputer, a mid-range computer, a mainframe computer, etc.

[0044] Among them, the air supply device 3 may be, but is not limited to, an air pump, a compressed air cylinder, etc.

[0045] Among them, see Figure 1The image module 4 includes a CCD camera 401, a microscope imaging device 402, and a three-axis movement mechanism 403 for driving the CCD camera 401 and the microscope imaging device 402. The CCD camera 401 is used to acquire an overall image of the liquid chamber 501; the microscope imaging device 402 is used to acquire local microscopic images of the bubbling points of the sintered mesh 90 under test. The CCD camera 401, the microscope imaging device 402, and the three-axis movement mechanism 403 (e.g., a three-axis translation stage) are all existing technologies and can be directly purchased on the market. The specific model can be selected according to actual needs.

[0046] In this embodiment, see Figure 2 , Figure 3 The test tank 5 includes a lower tank 503 and an upper tank 504. The inner wall of the lower tank 503 is provided with an internal thread and a limiting ring 505. The limiting ring 505 is located below the internal thread. The outer wall of the upper tank 504 is provided with an external thread that matches the internal thread. The upper tank 504 is connected to the internal thread through the external thread and presses the edge of the sintered mesh 90 under test onto the limiting ring 505. The sintered mesh 90 under test and the lower tank 503 form a gas cavity 502, and the upper tank 504 and the sintered mesh 90 under test form a liquid cavity 501.

[0047] When installing the sintered mesh 90 to be tested, first remove the upper groove 504, then place the sintered mesh 90 to be tested into the lower groove 503 and support it on the limiting ring 505. Next, screw the upper groove 504 into the lower groove 503 to press the limiting ring 505, thereby facilitating the installation and removal of the sintered mesh 90 to be tested and reliably ensuring that the sintered mesh 90 to be tested is effectively fixed during the testing process, avoiding displacement and air leakage of the sintered mesh 90 due to the increase in air pressure in the air chamber 502.

[0048] In some implementations, see Figure 3 The lower end face of the upper tank 504 is a Z-shaped end face composed of a first horizontal end face 5041, a first vertical end face 5042, and a second horizontal end face 5043. The first horizontal end face 5041 abuts against the upper surface of the edge of the sintered mesh 90 being tested, the first vertical end face 5042 abuts against the circumferential surface of the edge of the sintered mesh 90 being tested, and the second horizontal end face 5043 abuts against the upper surface of the limiting ring 505. Thus, the positioning effect of the first horizontal end face 5041 and the first vertical end face 5042 ensures that the sintered mesh 90 being tested is placed in the center and cannot move in the vertical or horizontal direction.

[0049] Preferably, see Figure 3A sealing gasket 506 is provided on the lower end face of the upper tank 504. Specifically, the sealing gasket 506 covers the entire lower end face of the upper tank 504, so the cross-section of the sealing gasket 506 is Z-shaped. This allows for effective positioning of the sintered mesh 90 under test, while reliably sealing the edge of the sintered mesh 90, preventing gas from the gas chamber 502 from leaking from the edge of the sintered mesh 90 under test (leakage would form bubbles, causing misidentification of bubbling points) and affecting the test results.

[0050] In some preferred embodiments, see Figure 2 The bubble testing device 2 also includes a liquid storage tank 7 located below the test tank 5. A drain port 507 is located at the lower end of the lower tank 503, and a solenoid valve 508 is installed at the drain port 507. The solenoid valve 508 is electrically connected to the host computer 1. In practical applications, when the quality of the sintered mesh 90 being tested is poor (with large pores or cracks, etc.), the test liquid may leak into the gas chamber 502. After the test, the test liquid that has entered the gas chamber 502 needs to be discharged. Here, by setting the drain port 507 and the solenoid valve 508, the test liquid can be automatically discharged without the need for manual removal of the test tank 5 for backflow, making it convenient to use. The test liquid is discharged into the liquid storage tank 7 for recycling. During the test, to ensure the airtightness of the gas chamber 502, a certain amount of test liquid can be pre-poured into the gas chamber 502 to water seal the drain port 507.

[0051] In order to ensure that all the test liquid in the air chamber 502 can be discharged, the bottom of the upper tank 504 can be set into a shape that is low in the middle and high around the edges, such as a truncated cone or a hemispherical shell, and the drain port 507 can be set at the lowest point of the bottom of the upper tank 504.

[0052] Furthermore, see Figure 3 A liquid passage hole 5051 is provided on the limiting ring 505 at a position opposite the second horizontal end face 5043, penetrating the upper and lower surfaces of the limiting ring 505. In practical applications, after the test is completed, the test liquid in the liquid chamber 501 needs to be drained before the sintered mesh 90 under test can be removed. At this time, by loosening the upper tank body 504, a gap is formed between the lower end face of the upper tank body 504 and the limiting ring 505. The test liquid in the liquid chamber 501 can flow into the liquid passage hole 5051 through this gap and then into the gas chamber 502. Finally, it is discharged through the drain port 507. There is no need to manually remove the test tank body 5 for backflow, which makes it more convenient to use.

[0053] To facilitate the recycling of the test liquid in the storage tank 7, the inner bottom wall of the storage tank 7 can be made into a slope, and a discharge port 701 can be set at the lowest point of the slope. A valve can be installed at the discharge port 701.

[0054] In some preferred embodiments, see Figure 2 The lower tank 503 is equipped with two horizontal end shafts 509, which are coaxially arranged on both sides of the lower tank 503. Both horizontal end shafts 509 are rotatably connected to the liquid storage tank 7. One of the horizontal end shafts 509 is connected to a motor 8, which is electrically connected to the host computer 1 and used to drive the test tank 5 to reciprocate. Specifically, the motor 8 is fixed on the outer wall of the liquid storage tank 7. Thus, after each air pressure adjustment, the test tank 5 can be reciprocated before image acquisition, to avoid air bubbles adhering to the surface of the sintered mesh 90 being tested and thus failing to be detected, thereby affecting the accuracy of the test results.

[0055] Furthermore, see Figure 2 Another horizontal end shaft 509 (i.e., the horizontal end shaft 509 not connected to the motor 8) has a vent hole coaxially arranged inside it. The vent hole passes through both ends of the horizontal end shaft 509 and communicates with the air chamber 502. The horizontal end shaft 509 is connected to the air supply device 3 through a rotary joint 9 (see...). Figure 1 This improves the overall structural compactness of the bubble testing device 2.

[0056] refer to Figure 4 This application provides a method for detecting the integrity of sintered mesh, based on the aforementioned sintered mesh integrity detection system, including the following steps:

[0057] A1. Install the sintered mesh 90 to be tested into the test tank 5, and inject the test liquid into the liquid chamber 501;

[0058] A2. Gas is supplied to the air chamber 502 by the gas supply device 3 to gradually increase the air pressure in the air chamber 502;

[0059] A3. After each increase in air pressure, maintain the pressure for a preset time, and then acquire an overall image of the liquid chamber 501 through the image module 4;

[0060] A4. The host computer 1 obtains the positions of multiple bubbling points based on the overall image, determines the air pressure when each bubbling point starts bubbling, and controls the image module 4 to acquire local microscopic images of each bubbling point based on the position of each bubbling point.

[0061] A5. The host computer 1 calculates the first aperture of each bubbling point based on the air pressure when each bubbling point starts to bubble, obtains the second aperture of each bubbling point based on the local microscopic image of each bubbling point, and calculates the effective aperture of each bubbling point based on the first aperture and the second aperture.

[0062] A6. The host computer 1 determines whether the aperture of the sintered mesh 90 being tested is qualified based on the effective aperture of each bubbling point.

[0063] The host computer 1 automatically adjusts the air pressure, acquires images, and measures the air pressure through the air supply device 3, image module 4, and air pressure sensor 6. Then, the host computer 1 automatically calculates the effective pore size of the bubbling point and judges the pore size qualification of the tested sintered mesh 90 based on the acquired images and air pressure. It has a high degree of automation and high detection efficiency. Furthermore, the calculation of the effective pore size of the bubbling point by combining the first pore size obtained by theoretical calculation and the second pore size obtained by local microscopic image recognition helps to improve the accuracy of the detection results.

[0064] In step A1, the injected test liquid can be, but is not limited to, water, alcohol, isopropanol, etc. When injecting the test liquid, it is generally injected to a preset height (or depth), which can be set according to actual needs.

[0065] In step A2, the air pressure in the air chamber 502 is monitored in real time by the air pressure sensor 6 to ensure that the air pressure in the air chamber 502 can be accurately increased step by step. When gradually increasing the air pressure in the air chamber 502, it can be done by increasing the pressure by a preset increment value each time (i.e., increasing the pressure by this increment value each time; the preset increment value can be set according to actual needs, for example, 50Pa-500Pa, but not limited to this), or by supplying gas to the air chamber 502 for a preset pressurization time each time (which can be set according to actual needs). During pressurization, the gas supply device 3 supplies gas to the air chamber 502 at a preset flow rate (which can be set according to actual needs). The supplied gas can be, but is not limited to, air, nitrogen, etc.

[0066] In step A3, the preset time for pressure holding can be set according to actual needs. When acquiring the overall image of the liquid chamber 501, the position of the CCD camera 401 is adjusted by the three-axis moving mechanism 403 so that the entire liquid surface in the liquid chamber 501 is included in the field of view of the CCD camera 401, and then the overall image of the liquid chamber 501 is acquired. Since the emergence of bubbles is not a continuous process, after each pressure holding, multiple frames of overall images need to be captured at a preset shooting frequency (which can be set according to actual needs).

[0067] In some preferred embodiments, in step A3, the test tank 5 is oscillating back and forth during the pressure holding process. Specifically, the test tank 5 is driven to oscillate back and forth by a motor 8. Sometimes, the bubbling pressure at some pores may be close to the current pressure, causing the first bubble to adhere to the surface of the sintered mesh 90 being tested and block the pore under the action of the bubble surface tension, preventing gas from flowing out of the pore and forming subsequent bubbles. At this time, these pores are already bubbling points, but they are difficult to accurately identify in the image. By oscillating the test tank 5 back and forth, the bubbles can be prevented from being undetected due to adhesion to the surface of the sintered mesh 90 being tested, thus affecting the accuracy of the detection results. In particular, the overall image of the liquid chamber 501 is acquired after the oscillation stops to avoid the inability to obtain the accurate location of the bubbling points from the overall image later.

[0068] In step A4, the positions of the first N bubbling points (i.e., the N bubbling points whose starting time is the first N) can be obtained, where N is a preset positive integer that can be set according to actual needs, such as 10, but is not limited to this. Since the shooting time of each frame of the overall image is recordable, and the air pressure value at each shooting moment can be collected and recorded by the air pressure sensor 6, the shooting time of the overall image with the first bubbling point (hereinafter referred to as the new bubbling point) in each frame is taken as the starting bubbling time of the new bubbling point, and the air pressure value at the starting bubbling time is taken as the air pressure when the new bubbling point starts bubbling. After obtaining the positions of each bubbling point, the microscope imaging device 402 can be moved sequentially to the position of each bubbling point by the three-axis moving mechanism 403 to collect local microscopic images. In order to avoid the bubbles affecting the clarity of the local microscopic images, the air pressure in the air chamber 502 can be restored to the ambient pressure first (by opening the drain port 507 to release pressure), and then the local microscopic images of each bubbling point can be collected.

[0069] The host computer 1 can identify the location of the bubble point using existing image recognition methods, such as using a pre-trained neural network model to identify the location of the bubble point (specifically, acquiring multiple frames of overall images and manually calibrating the bubble points to form a training image set, and using the training image set to train the neural network model), but is not limited to this.

[0070] In step A5, the first aperture of the bubbling point can be calculated using the following formula:

[0071]

[0072] in, The first aperture of the bubbling point, To test the surface tension of the liquid, The pressure difference between the upper and lower surfaces of the sintered mesh 90 being tested. This is the air pressure at which bubbling begins (the air pressure in air chamber 502). The hydraulic pressure on the upper surface of the sintered mesh 90 being tested. This refers to the ambient pressure (usually one atmosphere, which can be measured). To test the density of the liquid, The height (i.e., depth) of the test liquid. This is the acceleration due to gravity.

[0073] In step A5, the bubbling point region (i.e., the pore region) can be identified and its contour extracted using local microscopic images. Then, a circle is fitted based on the positions of the contour points on the contour line, and the diameter of the fitted circle is used as the second pore diameter of the corresponding bubbling point. The bubbling point region can be identified using existing image recognition methods, such as using a pre-trained neural network model (specifically, acquiring multiple frames of local microscopic images and manually calibrating the bubbling point regions to form a training image set, which is then used to train the neural network model), but is not limited to this. The specific methods for contour line extraction and circle fitting are existing technologies and will not be detailed here.

[0074] In step A5, the average or weighted average of the first and second aperture diameters can be calculated as the effective aperture diameter for the corresponding bubbling point. Compared with judging whether the aperture diameter of the tested sintered mesh 90 is qualified based solely on the theoretically calculated aperture diameter (i.e., the first aperture diameter), the calculation result of the effective aperture diameter is more accurate because it comprehensively considers the theoretical calculation results and the image recognition results, which helps to improve the accuracy of the aperture qualification judgment result of the tested sintered mesh 90.

[0075] In step A6, the pore size of the sintered mesh 90 under test can be determined according to a preset judgment rule. This judgment rule can be set according to actual needs. For example, whether the number of bubbling points in the first N bubbling points whose effective pore size exceeds a preset pore size threshold (which can be set according to actual needs) exceeds a preset quantity threshold (which can be set according to actual needs). If it exceeds the threshold, the pore size of the sintered mesh 90 under test is determined to be unqualified; otherwise, the pore size of the sintered mesh 90 under test is determined to be qualified. However, the specific judgment rule is not limited to this.

[0076] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0077] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A sintered mesh integrity detection system, characterized in that, It includes a host computer, a bubble testing device, a gas supply device, and an image module, wherein the gas supply device and the image module are both electrically connected to the host computer; The bubble testing device includes a test tank for mounting the sintered mesh under test. The inner cavity of the test tank is divided by the sintered mesh under test into a liquid cavity located above the sintered mesh and a gas cavity located below the sintered mesh. The liquid cavity is used to hold the test liquid, and the gas cavity is connected to the gas supply device, which is used to supply gas to the gas cavity to regulate the gas pressure in the gas cavity. A gas pressure sensor is installed in the gas cavity and is electrically connected to the host computer. The image module is positioned above the liquid cavity and is used to acquire an overall image of the liquid cavity and a local microscopic image of the bubbling point of the sintered mesh under test. The host computer is used to calculate the effective aperture of the bubbling point based on the overall image and local microscopic image acquired by the image module and the air pressure measured by the air pressure sensor, so as to determine whether the aperture of the sintered mesh under test is qualified. The test tank includes a lower tank and an upper tank. The inner wall of the lower tank is provided with an internal thread and a limiting ring, with the limiting ring positioned below the internal thread. The outer wall of the upper tank is provided with an external thread adapted to the internal thread. The upper tank is connected to the internal thread via the external thread and presses the edge of the sintered mesh under test against the limiting ring. The sintered mesh under test and the lower tank form the gas cavity, and the upper tank and the sintered mesh under test form the liquid cavity. The bubble testing device also includes a liquid storage tank located below the test tank. A drain port is provided at the lower end of the lower tank. An electromagnetic valve is provided at the drain port and is electrically connected to the upper host computer. The lower tank is provided with two horizontal end shafts, which are coaxially arranged on both sides of the lower tank and are rotatably connected to the liquid storage tank. One of the horizontal end shafts is connected to a motor, which is electrically connected to the upper computer and used to drive the test tank to swing back and forth.

2. The sintered mesh integrity detection system according to claim 1, characterized in that, The image module includes a CCD camera, a microscope imaging device, and a three-axis motion mechanism for driving the CCD camera and the microscope imaging device to move; the CCD camera is used to acquire an overall image of the liquid cavity; the microscope imaging device is used to acquire local microscopic images of the bubbling points of the sintered mesh under test.

3. The sintered mesh integrity detection system according to claim 1, characterized in that, The lower end face of the upper tank is a Z-shaped end face composed of a first horizontal end face, a first vertical end face, and a second horizontal end face. The first horizontal end face abuts against the upper surface of the edge of the sintered mesh being tested, the first vertical end face abuts against the circumferential surface of the edge of the sintered mesh being tested, and the second horizontal end face abuts against the upper surface of the limiting ring.

4. The sintered mesh integrity detection system according to claim 3, characterized in that, A sealing gasket layer is provided on the lower end face of the upper tank.

5. The sintered mesh integrity detection system according to claim 3, characterized in that, A liquid passage hole is provided on the limiting ring at a position directly opposite the second horizontal end face, penetrating the upper and lower surfaces of the limiting ring.

6. A method for detecting the integrity of sintered mesh, characterized in that, The sintered mesh integrity detection system according to any one of claims 1-5 includes the following steps: A1. Install the sintered mesh to be tested into the test tank and inject the test liquid into the liquid chamber; A2. Gas is supplied to the air chamber using a gas supply device to gradually increase the air pressure in the air chamber; A3. After each increase in air pressure, maintain the pressure for a preset time, and then acquire an overall image of the liquid chamber through the image module; A4. The host computer obtains the positions of multiple bubbling points based on the overall image, determines the air pressure when each bubbling point starts bubbling, and controls the image module to acquire local microscopic images of each bubbling point based on the position of each bubbling point. A5. The host computer calculates the first aperture of each bubbling point based on the air pressure when each bubbling point starts bubbling, obtains the second aperture of each bubbling point based on the local microscopic image of each bubbling point, and calculates the effective aperture of each bubbling point based on the first aperture and the second aperture. A6. The host computer determines whether the aperture of the sintered mesh being tested is qualified based on the effective aperture of each bubbling point.

7. The method for detecting the integrity of sintered mesh according to claim 6, characterized in that, In step A3, the test tank is oscillated back and forth during the pressure holding process.

Images