A device and method for detecting quality of industrial filter fabrics

Abstract

The present application relates to a device and method for detecting the quality of industrial filter fabrics, which belongs to the field of filter cloth detection technology, and includes a transmission module for driving the filter fabric to transmit in a preset transmission direction; a visual detection module for obtaining a visual detection image of the filter fabric; a wind speed detection module for obtaining a ventilation wind speed value of the filter fabric; a control module connected to the transmission module, the visual detection module and the wind speed detection module, and used to obtain a visual detection image and a ventilation wind speed value to control the transmission of the transmission module; wherein the control module determines whether there is a valid defect based on the visual detection image and the preset reference image, and if so, the control module controls the transmission module to stop transmission and controls the wind speed detection module to start, so as to obtain the ventilation wind speed value, and determines whether the valid defect is accurate based on the ventilation wind speed value and the preset standard wind speed value. The present application has the effect of improving detection efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of filter cloth detection, and in particular to a device and method for detecting the quality of industrial filter fabrics. Background Art

[0002] Industrial filter cloth is a material used to filter, separate or passivate fluids, usually made of fiber bundles or mesh. Due to its special physical and chemical properties, industrial filter cloth is widely used in various industries and fields, becoming the "heart" of various filtration and separation equipment, and the quality of the filter cloth is related to the filtration effect of the filtration and separation equipment.

[0003] Existing filter cloths usually use manual identification of surface defects to identify whether the cloth has defects such as stains, holes, spots, wrinkles, etc. This detection method has poor accuracy and high working intensity of the human eye, which is prone to missed detection and false detection. At the same time, manual operation is also inefficient and prone to fatigue, which leads to reduced detection efficiency. Summary of the invention

[0004] In order to solve the above-mentioned technical problems and improve the efficiency and accuracy of fabric detection, the present application provides a device and method for industrial filter fabric quality detection.

[0005] In the first aspect, the present application provides a quality detection device for industrial filter fabrics, which adopts the following technical solution:

[0006] A quality detection device for industrial filter fabrics, comprising:

[0007] A transmission module, used to drive the filter fabric to transmit in a preset transmission direction;

[0008] A visual inspection module, used for obtaining a visual inspection image of the filter fabric;

[0009] A wind speed detection module is used to obtain the ventilation wind speed value of the filter fabric;

[0010] The control module is connected to the transmission module, the visual detection module and the wind speed detection module, and is used to obtain the visual detection image and the ventilation wind speed value to control the transmission of the transmission module; wherein,

[0011] The control module determines whether there is a valid defect based on the visual inspection image and the preset reference image. If so, the control module controls the transmission module to stop transmission and controls the wind speed detection module to start to obtain the ventilation wind speed value, and determines whether the valid defect is accurate based on the ventilation wind speed value and the preset standard wind speed value.

[0012] By adopting the above technical solution, an automatic detection device is designed, and a visual detection module is used to obtain a visual detection image. The control module determines whether there are effective defects in the filter fabric by analyzing the visual detection image, and verifies the identified effective defects through the wind speed detection module, so as to improve the detection efficiency of the filter fabric while improving the detection accuracy of the filter fabric. At the same time, since the filter fabric needs to stop conveying when the wind speed detection module is performing wind speed detection, setting a visual detection image first to detect and identify the defects of the filter fabric can effectively improve the detection efficiency of the filter fabric.

[0013] Preferably, the transmission module includes a transmission frame and a transmission assembly, and the transmission frame is provided with an unwinding area, a visual detection area, a wind speed detection area, a human eye recognition area and a winding area in sequence according to a preset transmission direction of the filter fabric, and the transmission assembly is arranged on the transmission frame and drives the filter fabric to transmit in the preset transmission direction.

[0014] Preferably, the visual inspection area includes a first inspection area and a second inspection area, and the visual inspection module includes a surface recognition camera arranged in the first inspection area and a line light source and a light and shadow camera arranged in the second inspection area;

[0015] The visual detection image includes a first image and a second image, wherein the first image is a surface image of the filter fabric, and the second image is a light and shadow image of the filter fabric;

[0016] The surface recognition camera is used to obtain a first image of the filter fabric;

[0017] The line light source is used to provide illumination light for the filter fabric, and the light and shadow camera is used to obtain a second image of the filter fabric.

[0018] By adopting the above technical solution, a first image is first obtained by a surface recognition camera, and a control module determines whether there are visible surface defects on the filter fabric through the first image. Then, a second image is obtained by a light and shadow camera, and the control module screens out effective defects through the second image to reduce the activation of the wind speed detection module due to invalid defects that have no effect on the filtering effect, thereby reducing the detection efficiency of the filter fabric.

[0019] Preferably, the wind speed detection module is arranged in the wind speed detection area, and the wind speed detection module comprises a wind shield and a wind speed sensor;

[0020] The wind cover is used to cover the filter fabric located in the wind speed detection area;

[0021] The wind speed sensor is used to obtain the ventilation wind speed value after the filter fabric is ventilated.

[0022] Preferably, there are multiple wind speed sensors, and the wind speed detection area is evenly divided into several test areas;

[0023] The number of the test areas corresponds to the number of wind speed sensors, and a plurality of wind speed sensors are disposed in a plurality of the test areas in a one-to-one correspondence and are located at the center of the test areas.

[0024] By adopting the above technical solution, setting up multiple wind speed sensors can effectively improve the wind speed detection accuracy.

[0025] Preferably, the transmission assembly comprises a main conveying roller, an unwinding traction roller, a winding roller and a plurality of tensioning rollers rotatably arranged on the transmission frame;

[0026] The main conveying roller is connected to a conveying motor, and the conveying motor drives the main conveying roller to rotate;

[0027] The plurality of tension rollers are used to support the filter fabric;

[0028] A first synchronous belt is arranged between the unwinding traction roller and the main conveying roller, and the main conveying roller drives the unwinding traction roller to rotate synchronously through the first synchronous belt;

[0029] A third synchronous belt is provided between the main conveying roller and the winding roller, and the main conveying roller drives the winding roller to rotate synchronously through the third synchronous belt.

[0030] Preferably, the transmission assembly further comprises a plurality of auxiliary traction rollers and a plurality of conflict rollers;

[0031] The auxiliary traction roller is arranged in the visual detection area and the wind speed detection area, and the auxiliary traction roller is connected to the unwinding traction roller through a conveyor belt;

[0032] The plurality of the conflicting rollers are respectively arranged in correspondence with the unwinding traction roller and the auxiliary traction roller, and a certain gap is left between the conflicting roller and the unwinding traction roller or the auxiliary traction roller to allow the filter fabric to pass through, and the upper and lower surfaces of the filter fabric respectively conflict with the conflicting roller and the unwinding traction roller or the auxiliary traction roller.

[0033] By adopting the above technical solution, an auxiliary traction roller is set to ensure that the filter fabric can be unwound better, preventing the filter fabric from being excessively pulled and causing uneven gaps, and the transmission effect of the filter fabric is improved by setting a resistance roller.

[0034] Preferably, the main conveying roller is a hollow tube, and an inflatable shaft is inserted into one end of the main conveying roller away from the conveying motor;

[0035] The inflatable shaft is rotatably arranged on the transmission frame, one end of the inflatable shaft is inserted into the main conveying roller, and the airbag part of the inflatable shaft is located in the main conveying roller, and the third synchronous belt is connected to the inflatable shaft;

[0036] The inflatable shaft is connected to the control module and is controlled by the control module.

[0037] By adopting the above technical solution, the provision of an inflatable shaft can effectively realize the intermittent rotation of the winding roller, thereby reducing the increase in the winding diameter as the filter fabric is wound, thereby causing the transmission accuracy of the filter fabric to change and affecting the detection effect.

[0038] Preferably, the control module is connected with a tensioning micro switch and a relaxing micro switch, and the tensioning micro switch and the relaxing micro switch are arranged up and down;

[0039] The tensioning micro switch is used to send a tensioning signal to the control module, and the control module controls the inflatable shaft to stop inflating according to the tensioning signal;

[0040] The relaxation micro switch is used to send a relaxation signal to the control module, and the control module controls the inflation of the inflatable shaft according to the relaxation signal.

[0041] By adopting the above technical solution and setting the tensioning micro switch and the relaxing micro switch, the rotation of the winding roller can be controlled by the control module.

[0042] In a second aspect, a detection method using the quality detection device of the first aspect comprises the following steps:

[0043] Obtaining a visual inspection image of the filter fabric, and judging whether there is a valid defect based on the visual inspection image and a preset reference image;

[0044] If not, the filter fabric is controlled to continue transmitting the test;

[0045] If yes, the filter fabric is controlled to stop conveying so that the defective part of the filter fabric is located in the wind speed detection area, and the following steps are performed:

[0046] Obtaining the ventilation wind speed value of the filter fabric, and obtaining a comparison result based on the ventilation wind speed value and the preset standard wind speed value;

[0047] Based on the comparison results, the effective defects are verified again to determine whether the effective defects are accurate;

[0048] If yes, the filter fabric is controlled to continue transmitting the test;

[0049] If not, the filter fabric is controlled to stop conveying so that the defective part of the filter fabric is located in the human eye recognition area, and a prompt signal is issued.

[0050] In summary, the present application includes at least one of the following beneficial technical effects:

[0051] 1. An automated detection device is set up to replace the manual visual recognition method to detect the filter fabric, thereby improving the detection efficiency of the filter fabric; the defects of the filter fabric are photographed and identified through the visual module, and the detection results of the filter fabric in the visual module are verified through the wind speed detection module, thereby improving the detection accuracy;

[0052] 2. By setting up the first detection area and the second detection area, the surface image used to reflect the surface visible defects and the light and shadow image used to identify whether the filter fabric is uniform are respectively obtained, so as to effectively classify the defect types of the filter fabric based on visual judgment, so as to solve the problem of reduced detection efficiency caused by the need to control the filter fabric to stop conveying for wind speed detection when defects are detected;

[0053] 3. By designing the structure of the main transmission roller and the relaxation micro switch and the tension micro switch, the intermittent rotation and winding of the winding roller can be realized, thereby effectively solving the problem that the winding diameter of the winding roller increases as the filter fabric is wound, thereby causing the transmission speed of the filter fabric to change and affecting the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of a module of a detection device in an embodiment of the present application;

[0055] Figure 2 is a schematic structural diagram of a transmission module of a detection device according to an embodiment of the present application from one perspective;

[0056] Figure 3 is a schematic diagram of the structure of the detection device in the embodiment of the present application;

[0057] Figure 4 is a schematic structural diagram from another perspective of a transmission module of a detection device in an embodiment of the present application;

[0058] Figure 5 It is a schematic diagram of the process of the detection method in the embodiment of the present application.

[0059] Explanation of the reference numerals: 1. Transmission module; 11. Transmission frame; 12. Transmission assembly; 121. Main transmission roller; 122. Unwinding traction roller; 123. Winding roller; 124. Tensioning roller; 125. Transmission motor; 126. Installation roller; 127. Auxiliary traction roller; 128. Resistance roller; 129. Inflatable shaft; 13. First synchronous belt; 14. Second synchronous belt; 15. Third synchronous belt; 2. Visual inspection module; 21. Surface recognition camera; 22. Line light source; 23. Light and shadow camera; 3. Wind speed detection module; 31. Wind hood; 32. Wind speed sensor; 4. Control module; 5. Relaxation micro switch; 6. Tensioning micro switch. DETAILED DESCRIPTION

[0060] The following is combined with the accompanying drawings Figure 1-Figure 5 This application is described in further detail.

[0061] The present application embodiment discloses a quality detection device for industrial filter fabrics. Figure 1 , the quality inspection device includes:

[0062] The transmission module 1 is used to drive the filter fabric to transmit in a preset transmission direction;

[0063] Visual inspection module 2, used to obtain a visual inspection image of the filter fabric; in the embodiment of the present application, the visual inspection image includes a first image and a second image, wherein the first image is a surface image of the filter fabric, and the second image is a light and shadow image of the filter fabric;

[0064] Wind speed detection module 3, used to obtain the ventilation wind speed value of the filter fabric;

[0065] The control module 4 is connected to the transmission module 1 , the visual detection module 2 and the wind speed detection module 3 , and is used to obtain the visual detection image and the ventilation wind speed value to control the transmission of the transmission module 1 .

[0066] Specifically, refer to Figure 2 and Figure 3 The transmission module 1 includes a transmission frame 11 and a transmission assembly 12. The transmission frame 11 is provided with an unwinding area, a visual detection area, a wind speed detection area, a human eye recognition area and a winding area in sequence according to the preset transmission direction of the filter fabric. The transmission assembly 12 is provided on the transmission frame 11 and drives the filter fabric to be transmitted according to the preset transmission direction. The width of the wind speed recognition area and the human eye recognition area are the same, and the banner of the wind speed recognition area and the human eye recognition area are also the same; the banner is the same as the width direction of the filter fabric, and is equal to the width of the filter fabric, and the width is the same as the length direction of the filter fabric.

[0067] Reference Figure 2 and Figure 4The transmission assembly 12 includes a main transmission roller 121, an unwinding traction roller 122, a winding roller 123 and a plurality of tension rollers 124 which are rotatably arranged on the transmission frame 11, wherein the main transmission roller 121 is connected to a transmission motor 125, and the transmission motor 125 drives the main transmission roller 121 to rotate; the plurality of tension rollers 124 support the filter fabric, and make the filter fabric tensioned between the tension rollers 124 during the transmission process, and similarly, the tension rollers 124 can also be fixedly arranged on the transmission frame 11. A first synchronous belt 13 is arranged between the unwinding traction roller 122 and the main transmission roller 121, and the main transmission roller 121 drives the unwinding traction roller 122 to rotate synchronously through the first synchronous belt 13; a third synchronous belt 15 is arranged between the main transmission roller 121 and the winding roller 123, and the main transmission roller 121 drives the winding roller 123 to rotate synchronously through the third synchronous belt 15.

[0068] Reference Figure 2 and Figure 3 The transmission frame 11 is also equipped with a mounting roller 126 for mounting the filter fabric reel. Since the filter fabric needs to be replaced, in order to facilitate the replacement of the filter fabric, the filter fabric is wound around the shaft core. The mounting roller 126 and the winding roller 123 are used to mount the shaft core. The filter fabric can be unwound and wound up by rotating the shaft core. In order to facilitate installation, in the embodiment of the present application, the mounting roller 126 and the winding roller 123 are both airbag shafts. The mounting roller 126 and the winding roller 123 are fixed by the airbag against the shaft core; and the mounting roller 126 and the winding roller 123 are detachably arranged with the transmission frame 11. When the filter fabric needs to be replaced on the transmission frame 11, the mounting roller 126 and the winding roller 123 can be removed from the transmission frame 11; when the filter fabric is replaced, the mounting roller 126 and the winding roller 123 are mounted on the transmission frame 11 and are rotatably connected with the transmission frame 11.

[0069] Reference Figure 3 The unwinding traction roller 122 is arranged between the unwinding area and the visual inspection area, and is used to drive the filter fabric to unwind; the winding roller 123 is arranged in the winding area, and is used to wind up the filter fabric after quality inspection; the main transmission roller 121 is arranged between the human eye recognition area and the winding area, and is used to drive the unwinding traction roller 122 and the winding roller 123 to rotate, thereby realizing the transmission of the filter fabric.

[0070] Reference Figure 2 and Figure 3The transmission assembly 12 also includes a plurality of auxiliary traction rollers 127 and a plurality of contact rollers 128. The auxiliary traction rollers 127 are arranged in the visual detection area and the wind speed detection area, and the auxiliary traction rollers 127 are connected to the unwinding traction roller 122 through a conveyor belt. The unwinding traction roller 122 drives the auxiliary traction roller 127 to rotate through the second synchronous belt 14, thereby ensuring that the filter fabric can be better transmitted between various areas. The unwinding traction roller 122 and the auxiliary traction roller 127 are respectively arranged one by one with the contact roller 128, and one side of the main conveying roller 121 is also correspondingly provided with a contact roller 128. There is a certain gap between the contact roller 128 and the unwinding traction roller 122, the auxiliary traction roller 127 and the main conveying roller 121 to pass the filter fabric. The upper and lower surfaces of the filter fabric are respectively in contact with the contact roller 128 and the unwinding traction roller 122 or the auxiliary traction roller 127, so as to utilize the friction between the filter fabric and the unwinding traction roller 122 or the auxiliary traction roller 127 to make the filter fabric be transmitted. In one embodiment, the spacing between the resisting roller 128 and the unwinding traction roller 122 and the auxiliary traction roller 127 is adjustable.

[0071] Reference Figure 1 and Figure 3 The visual inspection area includes a first inspection area and a second inspection area. The width of the first inspection area and the second inspection area is the same as the width of the wind speed identification area, and the banner of the first inspection area and the second inspection area is also the same as the banner of the wind speed identification area. The visual inspection module 2 includes a surface recognition camera 21 for image acquisition arranged in the first inspection area. The surface recognition camera 21 is used to obtain a first image of the filter fabric. The surface recognition camera 21 can be one or two. In the embodiment of the present application, two surface recognition cameras 21 are used for demonstration and description. When the filter fabric passes through the visual inspection area, the two surface recognition cameras 21 are respectively located on the upper and lower sides of the filter fabric and the image acquisition ends of the two surface recognition cameras 21 are both facing the filter fabric. The first images of the two surfaces of the filter fabric are obtained by the surface recognition camera 21, and the first images are transmitted to the control module 4. The control module 4 is preset with a first reference image. The first reference image is a surface image obtained by the surface recognition camera 21 for the standard filter fabric (i.e., the filter fabric in a flawless state). The control module 4 compares the first image with the first reference image to determine whether the filter fabric has defects; if the first image matches the first reference image, it means that the filter fabric has no defects; if the first image does not match the first reference image, it means that the filter fabric has defects.

[0072] Reference Figure 1 and Figure 3, the visual inspection module 2 also includes a line light source 22 and a light and shadow camera 23 arranged in the second inspection area, the line light source 22 and the light and shadow camera 23 are arranged up and down, wherein the line light source 22 is used to provide illumination light for the filter fabric, and the light and shadow camera 23 is used to obtain a second image of the filter fabric. When the filter fabric passes through the visual inspection area, the light and shadow camera 23 and the line light source 22 are respectively located on the upper and lower sides of the filter fabric, and the image acquisition end of the light and shadow camera 23 and the light-emitting side of the line light source 22 are both facing the filter fabric. The light intensity of the filter fabric is enhanced by the line light source 22, so that the light and shadow camera 23 can obtain the light and shadow image of the filter fabric after light is transmitted; after the light and shadow camera 23 captures the light and shadow image of the filter fabric after passing through the filter fabric, the second image is transmitted to the control module 4, and the control module 4 is preset with a second reference image, which is the light and shadow image obtained by the light and shadow camera 23 on the standard filter fabric (i.e., the filter fabric in a flawless state). The control module 4 determines the light transmittance of the filter fabric by comparing the second image with the second reference image; if the second image matches the second reference image, it means that the light transmittance of the filter fabric is consistent; if the second image does not match the second reference image, it means that the light transmittance of the filter fabric is inconsistent.

[0073] The control module 4 analyzes and determines whether the filter fabric has defects according to the comparison results between the first image and the first reference image, and preliminarily determines the defect type according to the comparison results; the control module 4 analyzes and determines whether the filter fabric has consistent light transmittance according to the comparison results between the second image and the second reference image, and preliminarily determines whether the filter fabric has uneven light transmittance according to the comparison results. For the filter fabric, visual defects such as spots and color differences will not have a substantial impact on the filtering effect of the filter fabric, while defects such as holes, wrinkles, uneven filter cloth, etc. will have a substantial impact on the filtering effect of the filter fabric. The control module 4 divides the defects into invalid defects and valid defects according to the impact of the defects on the filter fabric. Invalid defects are defect types that will not have a substantial impact on the filtering effect of the filter fabric, and valid defects are defect types that will have a substantial impact on the filtering effect of the filter fabric. Since there is a certain error rate in visual recognition, in order to prevent the filter fabric from misjudging spots, color differences, etc. as holes or wrinkles, the control module 4 can also reversely correct the comparison results of the first image through the analysis of the light transmittance of the filter fabric to obtain the final defect type.

[0074] Reference Figure 1 and Figure 3If the control module 4 analyzes that the final defect type is a valid defect, the control module 4 controls the transmission component 12 to stop transmitting, so that the filter fabric stops transmitting, and at this time, the part of the filter fabric where the valid defect is detected is just located in the wind speed detection area. The wind speed detection module 3 is arranged in the wind speed detection area, and the wind speed detection module 3 includes a wind cover 31 and a plurality of wind speed sensors 32. The wind cover 31 is used to cover the filter fabric located in the wind speed detection area and perform a wind speed test on the filter fabric. The plurality of wind speed sensors 32 are used to obtain the ventilation wind speed value of the filter fabric after ventilation. The wind cover 31 can blow air to the filter fabric, or it can extract air from the filter fabric, as long as air flow can be generated on both sides of the filter fabric. The embodiment of the present application takes the wind cover 31 blowing air to the filter fabric as an example for demonstration. When the filter fabric passes through the wind speed detection area, the wind cover 31 and the wind speed sensor are respectively located on the upper and lower sides of the filter fabric, and the sensing end of the wind speed sensor 32 faces the filter fabric.

[0075] Reference Figure 1 and Figure 3 According to the banner and width of the filter fabric in the wind speed detection area, the wind speed detection area is evenly divided into several test areas. The number of test areas corresponds to the wind speed sensors 32. Several wind speed sensors 32 are set in several test areas one by one and are located in the center of the test area to better obtain the ventilation wind speed value after the filter fabric is blown. Several wind speed sensors 32 are connected to the control module 4, and the ventilation wind speed values ​​obtained by them are transmitted to the control module 4; the control module 4 presets standard wind speed values ​​corresponding to the wind speed sensors for several wind speed sensors 32. The standard wind speed value is the ventilation wind speed value obtained by the wind speed sensor 32 for the standard filter fabric (i.e., the filter fabric in a flawless state) at the same wind speed of the wind cover 31. The control module 4 compares the obtained ventilation wind speed value with the standard wind speed value. If the ventilation wind speed value is less than the standard wind speed value, it means that there are defects such as wrinkles and folds in this area of ​​the filter fabric, the filter cloth is too dense, etc., which lead to low air permeability of the filter fabric; if the ventilation wind speed is greater than the standard wind speed value, it means that there are holes, damages, sparse filter cloth, etc. in the filter fabric, which lead to defects such as excessive air permeability of the filter fabric.

[0076] Reference Figure 1 and Figure 3In order to reduce the occurrence of missed judgment and wrong judgment, the judgment result of the ventilation wind speed value is compared with the effective defect, that is, in the case of no missed judgment or wrong judgment, the ventilation wind speed value corresponding to the area of ​​the filter fabric with effective defects must be less than or greater than the standard wind speed value; the control module 4 verifies the effective defects detected by the visual inspection module 2 again through the detection of the wind speed detection module 3 to determine whether the effective defects are accurate. If damage is detected at a certain position of the filter fabric during visual inspection, and the air permeability wind speed value of the area where the defect is located is greater than the standard wind speed value, it means that the detection of the visual inspection module 2 is consistent with the detection of the wind speed detection module 3, and the judgment of the effective defect is accurate, indicating that there is no missed judgment or wrong judgment; if damage is detected at a certain position of the filter fabric during visual inspection, and the air permeability wind speed value of the area where the defect is located is less than or equal to the standard wind speed value, it means that the detection of the visual inspection module 2 is inconsistent with the detection of the wind speed detection module 3, and the judgment of the effective defect is wrong, indicating that there is a missed judgment or wrong judgment; if the air permeability wind speed value of a detection area is greater than or less than the standard wind speed value, but no effective defect is detected at a certain position of the filter fabric during visual inspection, it means that there is a missed judgment or wrong judgment.

[0077] Reference Figure 1 and Figure 3 , when the control module 4 analyzes that the visual inspection result is inconsistent with the wind speed detection result, it means that there is a missed judgment or a wrong judgment. For the missed judgment or wrong judgment, it is necessary to manually conduct a detection review and correct the missed or wrong judgment detection link to improve the detection accuracy of the equipment. After the wind speed detection module 3 completes the detection, that is, when the control module 4 receives the ventilation wind speed value, the control module 4 controls the transmission component 12 to restart so that the filter fabric continues to transmit; if the control module 4 analyzes that the visual inspection result is consistent with the wind speed detection result, it means that the defect judgment is accurate and the fabric directly passes through the human eye detection area; if the control module 4 analyzes that the visual inspection result is inconsistent with the wind speed detection result, it means that there is a missed judgment or a wrong judgment. At this time, the control module 4 controls the transmission component 12 to stop again, so that the part of the filter fabric that was originally in the wind speed detection area is just in the human eye recognition area. The transmission frame 11 is provided with a prompt component. When there is a missed judgment or a misjudgment, the control module 4 controls the prompt component to send a prompt signal. The prompt component can be a sound reminder or a light reminder. Therefore, the prompt signal can be a sound reminder or a light reminder, as long as it can remind the personnel in the human eye recognition area to perform human eye recognition detection on the filter fabric.

[0078] Reference Figure 1 and Figure 3In order to ensure that the filter fabric can accurately stop in the wind speed detection area and the human eye recognition area, the conveying motor 125 is controlled by the control module 4. Based on the time required for the analysis and judgment of the control module 4, the control module 4 controls the shut-off time of the conveying motor 125 according to the formula S=V*T. In the embodiment of the present application, S is the width of the second detection area, the wind speed recognition area and the human eye recognition area, V is the conveying speed of the filter fabric, T is the time the filter fabric needs to be conveyed, and in the embodiment of the present application, T is greater than or equal to the time required for the analysis and judgment of the control module 4, and T is a range value, which can be preset in the control module 4. The conveying speed of the filter fabric is related to the rotation speed of the conveying motor 125 and the circumference of the main conveying roller 121. In the embodiment of the present application, the output shaft of the conveying motor 125 and the main conveying roller 121 are coaxially fixed as an example for display and description. The conveying speed of the filter fabric is V=v*l, where v is the rotation speed of the conveying motor 125, and l is the circumference of the main conveying roller 121, that is, the conveying speed of the filter fabric is the product of the number of revolutions per second of the main conveying roller 121 and its circumference. In the embodiment of the present application, the width of the second detection, i.e. S, is known, the lower limit value of T is known, the circumference l of the main conveying roller 121 is known, and the control module 4 sets the speed v of the conveying motor 125 according to S, T and l, so that when the predetermined conveying time T is reached, the control module 4 controls the conveying motor 125 to stop rotating.

[0079] Reference Figure 3 and Figure 4 During the winding process of the winding roller 123, as the filter fabric is wound on the winding roller 123, the length of the filter fabric required for each winding of the winding roller 123 will also increase. Therefore, in order to prevent the filter fabric from being stretched and affecting the filtering effect of the filter fabric due to the tension between the winding roller 123 and the main conveying roller 121, the end of the main conveying roller 121 away from the conveying motor 125 is connected to the winding roller 123 through the third synchronous belt 15. The main conveying roller 121 is a hollow tube, and the end away from the conveying motor 125 is plugged with an inflatable shaft 129. The inflatable shaft 129 is rotatably arranged on the transmission frame 11, and one end of the inflatable shaft 129 is inserted into the main conveying roller 121, and the airbag part of the inflatable shaft 129 is located in the main conveying roller 121, and the third synchronous belt 15 is connected to the inflatable shaft 129. When the filter fabric needs to be rolled up by the winding roller 123, the inflatable shaft 129 is inflated, and the inflatable shaft 129 contacts the inner wall of the main conveying roller 121 through the airbag, so that the inflatable shaft 129 and the main conveying roller 121 rotate synchronously; when the filter fabric does not need to be rolled up, the inflatable shaft 129 is disengaged from the main conveying roller 121, so that the winding roller 123 does not rotate and does not roll up the filter fabric.

[0080] Reference Figure 3 and Figure 4To ensure that the filter fabric can be rolled up in time, the control module 4 is also connected to a tensioning micro switch 6 and a relaxing micro switch 5, which are arranged up and down; when the filter fabric is inserted between the winding roller 123 and the main conveying roller 121, the tensioning micro switch 6 is located above the filter fabric, and the relaxing micro switch 5 is located below the filter fabric, and the micro triggering ends of the tensioning micro switch 6 and the relaxing micro switch 5 are both facing the filter fabric. The tensioning micro switch 6 is used to send a tensioning signal to the control module 4. The tensioning signal and the relaxing signal are both trigger signals. Before receiving a changed signal, the control module 4 maintains the trigger state of the previous signal. That is, when the filter fabric contacts the tensioning microswitch 6, the tensioning microswitch 6 sends a tensioning signal to the control module 4. When the control module 4 receives the tensioning signal output by the tensioning microswitch 6, the control module 4 controls the inflatable shaft 129 to stop inflating, and the inflatable shaft 129 is separated from the main conveying roller 121; before the control module 4 receives the relaxation signal, the control module 4 controls the inflatable shaft 129 to remain separated from the main conveying shaft; when the filter fabric contacts the relaxation microswitch 5, the relaxation microswitch 5 sends a relaxation signal to the control module 4. At this time, the control module 4 receives the relaxation signal and controls the inflatable shaft 129 to inflate. The inflatable shaft 129 is fixed to the main conveying roller 121 through the airbag, so that the third synchronous belt 15 drives the winding roller 123 to rotate to rewind the filter fabric. Before the control module 4 receives the tensioning signal, the control module 4 controls the inflatable shaft 129 to remain fixed to the main conveying shaft until the filter fabric contacts the tensioning microswitch 6 again.

[0081] The present application also discloses a method for detecting the quality of industrial filter fabrics. Figure 5 The detection method adopts the detection device disclosed in the above embodiment, and specifically includes the following steps:

[0082] S1. Obtain a visual inspection image of the filter fabric, and determine whether there is a valid defect based on the visual inspection image and a preset reference image;

[0083] S2, if not, control the filter fabric to continue transmitting the test;

[0084] S3. If yes, control the filter fabric to stop conveying so that the defective part of the filter fabric is located in the wind speed detection area, and perform the following steps:

[0085] S4, obtaining the ventilation wind speed value of the filter fabric, and obtaining a comparison result based on the ventilation wind speed value and the preset standard wind speed value;

[0086] S5. Verify the effective defect again based on the comparison result to determine whether the effective defect is accurate;

[0087] S6, if yes, control the filter fabric to continue transmission detection;

[0088] S7. If not, the filter fabric is controlled to stop conveying so that the defective part of the filter fabric is located in the human eye recognition area, and a prompt signal is issued.

[0089] Specifically, the visual inspection image of the filter fabric is obtained by the visual inspection module 2 preset in the visual inspection area. It has been disclosed in the above embodiment that the visual inspection area includes a first inspection area and a second inspection area, so the visual inspection image includes a first image obtained from the first inspection area and a second image obtained from the second inspection area. The first image is a surface image of the filter fabric, and the second image is a light and shadow image of the filter fabric. The control module 4 sequentially compares the first image with the first reference image to determine whether the first image matches the first reference image, and compares the second image with the second reference image to determine whether the second image matches the second reference image. Based on the matching result of the first image and the second image, it is analyzed to determine whether there is an effective defect. The control module 4 divides the defects into invalid defects and effective defects according to the impact of the defects on the filter fabric. Invalid defects are defect types that will not have a substantial impact on the filtering effect of the filter fabric, and effective defects are defect types that will have a substantial impact on the filtering effect of the filter fabric.

[0090] If there is no effective defect, it means that the filter fabric does not have the defect type that affects the filtering effect of the filter fabric, and the filter fabric can be controlled to continue to be conveyed.

[0091] If there is an effective defect, it means that the filter fabric has a defect type that affects the filtering effect of the filter fabric, and the defect needs to be verified again. In the embodiment of the present application, the ventilation wind speed value of the filter fabric is obtained, and the ventilation wind speed value is compared with the preset standard wind speed value. When the ventilation wind speed value is obtained, the transmission of the filter fabric needs to be stopped. At this time, the control module 4 controls the part where the effective defect of the filter fabric is detected to stop in the wind speed detection area. The filter fabric is blown by the preset wind cover 31 so that there is a directional air flow on the surface of the filter fabric. In order to improve the verification accuracy, the present application divides the wind speed detection area into multiple test areas, and sets a wind speed sensor 32 in the center of each test area to obtain multiple ventilation wind speed values. The control module 4 presets a standard wind speed value corresponding to the test area one by one, and compares the multiple ventilation wind speed values ​​with the corresponding standard wind speed values, so as to judge whether each test area has a situation where the air permeability of the filter fabric is too large or too small, so as to verify whether the judgment of the visual detection image is accurate.

[0092] Since the wind speed detection needs to be carried out when the filter fabric is stationary, a visual inspection is first carried out along the conveying direction of the filter fabric to ensure that the filter fabric can be inspected in the conveying state, thereby increasing the rate of filter fabric inspection. The control module 4 that has completed the training first obtains the visual inspection image to detect defects on the filter fabric, which can effectively and quickly obtain the defects of the filter fabric and analyze and determine whether the defects are effective defects. The wind speed detection module 3 then performs another wind speed test on the filter fabric part with effective defects, and by comparing and analyzing the size of the ventilation wind speed value and the standard wind speed value, the judgment result of the control module 4 in the visual inspection part is verified.

[0093] If the judgment is accurate, it means that there is no omission or misjudgment of the effective defects detected in the visual inspection area. At this time, the filter fabric can be controlled to continue to be transmitted.

[0094] If the judgment is inaccurate, it means that the effective defects detected in the visual inspection area are missed and / or misjudged, and manual review is required at this time. During human eye recognition, the filter fabric needs to stop conveying, and the control module 4 controls the part of the filter fabric where the effective defects are detected to stop in the human eye recognition area. Since the filter fabric also needs to stop conveying during wind speed detection, in order to facilitate the detection personnel to quickly distinguish whether the filter fabric stopped in the human eye recognition area needs to be recognized by the human eye, the device is also provided with a prompt component. When the filter fabric needs to be recognized by the human eye, the prompt component sends a prompt signal to remind the personnel in the human eye recognition area to perform human eye recognition detection on the filter fabric. During human eye recognition, the detection personnel will compare the final detection results obtained with the visual detection results and the wind speed detection results, and correct the inconsistent detection results. The control module 4 performs neural network learning again through correction to improve the subsequent detection accuracy of the device.

[0095] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A quality detection device for industrial filter fabrics, characterized in that: include: A transmission module (1) is used to drive the filter fabric to be transmitted in a preset transmission direction; A visual inspection module (2), used for obtaining a visual inspection image of the filter fabric; A wind speed detection module (3) is used to obtain the ventilation wind speed value of the filter fabric; The control module (4) is connected to the transmission module (1), the visual detection module (2) and the wind speed detection module (3), and is used to obtain the visual detection image and the ventilation wind speed value to control the transmission of the transmission module (1); wherein, The control module (4) determines whether there is a valid defect based on the visual detection image and the preset reference image. If so, the control module (4) controls the transmission module (1) to stop transmission and controls the wind speed detection module (3) to start, so as to obtain the ventilation wind speed value, and determines whether the valid defect is accurate based on the ventilation wind speed value and the preset standard wind speed value.

2. The quality detection device for industrial filter fabrics according to claim 1 is characterized in that: The transmission module (1) comprises a transmission frame (11) and a transmission assembly (12); the transmission frame (11) is provided with an unwinding area, a visual detection area, a wind speed detection area, a human eye recognition area and a winding area in sequence according to a preset transmission direction of the filter fabric; the transmission assembly (12) is arranged on the transmission frame (11) and drives the filter fabric to be transmitted according to the preset transmission direction.

3. The quality detection device for industrial filter fabrics according to claim 2 is characterized in that: The visual inspection area comprises a first inspection area and a second inspection area, and the visual inspection module (2) comprises a surface recognition camera (21) arranged in the first inspection area and a line light source (22) and a light and shadow camera (23) arranged in the second inspection area; The visual detection image includes a first image and a second image, wherein the first image is a surface image of the filter fabric, and the second image is a light and shadow image of the filter fabric; The surface recognition camera (21) is used to obtain a first image of the filter fabric; The line light source (22) is used to provide illumination light for the filter fabric, and the light and shadow camera (23) is used to acquire a second image of the filter fabric.

4. The quality detection device for industrial filter fabrics according to claim 2 is characterized in that: The wind speed detection module (3) is arranged in the wind speed detection area, and the wind speed detection module (3) comprises a wind cover (31) and a wind speed sensor (32); The wind cover (31) is used to cover the filter fabric located in the wind speed detection area; The wind speed sensor (32) is used to obtain the ventilation wind speed value after the filter fabric is ventilated.

5. The quality detection device for industrial filter fabrics according to claim 4 is characterized in that: There are a plurality of wind speed sensors (32), and the wind speed detection area is evenly divided into a plurality of test areas; The number of the test areas corresponds to the wind speed sensors (32), and a plurality of the wind speed sensors (32) are arranged in a one-to-one correspondence within a plurality of the test areas and are located at the center of the test areas.

6. The quality detection device for industrial filter fabrics according to claim 2 is characterized in that: The transmission assembly (12) comprises a main transmission roller (121), an unwinding traction roller (122), a winding roller (123) and a plurality of tensioning rollers (124) which are rotatably arranged on the transmission frame (11); The main conveying roller (121) is connected to a conveying motor (125), and the conveying motor (125) drives the main conveying roller (121) to rotate; A plurality of tension rollers (124) are used to support the filter fabric; A first synchronous belt (13) is provided between the unwinding traction roller (122) and the main conveying roller (121) to connect them, and the main conveying roller (121) drives the unwinding traction roller (122) to rotate synchronously via the first synchronous belt (13); A third synchronous belt (15) is provided between the main conveying roller (121) and the winding roller (123) for connection, and the main conveying roller (121) drives the winding roller (123) to rotate synchronously via the third synchronous belt (15).

7. The quality detection device for industrial filter fabrics according to claim 6 is characterized in that: The transmission assembly (12) further comprises a plurality of auxiliary traction rollers (127) and a plurality of conflicting rollers (128); The auxiliary traction roller (127) is arranged in the visual detection area and the wind speed detection area, and the auxiliary traction roller (127) is connected to the unwinding traction roller (122) via a second synchronous belt (14); A plurality of the abutment rollers (128) are respectively arranged in correspondence with the unwinding traction roller (122) and the auxiliary traction roller (127) in an upper and lower position, and a certain gap is left between the abutment roller (128) and the unwinding traction roller (122) or the auxiliary traction roller (127) to allow the filter fabric to pass through, and the upper and lower surfaces of the filter fabric respectively abut against the abutment roller (128) and the unwinding traction roller (122) or the auxiliary traction roller (127).

8. The quality detection device for industrial filter fabrics according to claim 6 is characterized in that: The main conveying roller (121) is a hollow tube, and an inflatable shaft (129) is inserted into one end of the main conveying roller away from the conveying motor (125); The inflatable shaft (129) is rotatably arranged on the transmission frame (11), one end of the inflatable shaft (129) is inserted into the main conveying roller (121), and the airbag part of the inflatable shaft (129) is located in the main conveying roller (121), and the third synchronous belt (15) is connected to the inflatable shaft (129); The inflatable shaft (129) is connected to the control module (4) and is controlled by the control module (4).

9. The quality detection device for industrial filter fabrics according to claim 8 is characterized in that: The control module (4) is connected to a tensioning micro switch (6) and a relaxing micro switch (5), and the tensioning micro switch (6) and the relaxing micro switch (5) are arranged up and down; The tensioning micro switch (6) is used to send a tensioning signal to the control module (4), and the control module (4) controls the inflatable shaft (129) to stop inflating according to the tensioning signal; The relaxation micro switch (5) is used to send a relaxation signal to the control module (4), and the control module (4) controls the inflation of the inflatable shaft (129) according to the relaxation signal.

10. A detection method using the quality detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Obtaining a visual inspection image of the filter fabric, and judging whether there is a valid defect based on the visual inspection image and a preset reference image; If not, the filter fabric is controlled to continue transmitting the test; If yes, the filter fabric is controlled to stop conveying so that the defective part of the filter fabric is located in the wind speed detection area, and the following steps are performed: Obtaining the ventilation wind speed value of the filter fabric, and obtaining a comparison result based on the ventilation wind speed value and the preset standard wind speed value; Based on the comparison results, the effective defects are verified again to determine whether the effective defects are accurate; If yes, the filter fabric is controlled to continue transmitting the test; If not, the filter fabric is controlled to stop conveying so that the defective part of the filter fabric is located in the human eye recognition area, and a prompt signal is issued.

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