Nonwoven web defect detection device and detection method thereof

Abstract

The present invention is applicable to the technical field of non-woven fabric detection, and provides a non-woven fabric web defect detection device and a detection method thereof, including a mounting base, the mounting base includes a horizontally arranged workbench, and a pretreatment unit, a longitudinal tensile test unit, a transverse tensile test unit, and an air tightness test unit are sequentially installed on the top of the workbench. The device solves the problem that the thread ends and impurities on the surface of the non-woven fabric interfere with the tensile strength test results, the non-woven fabric is deformed in another direction due to lack of tensile control during tensile tests in different directions, affecting the test results, and the atomized material soaking the surface of the non-woven fabric during air tightness tests. The device achieves the effect of removing impurities and thread ends before testing to avoid interfering with the tensile strength test results, and the longitudinal tensile test and the transverse tensile test assist each other to avoid deformation of the non-woven fabric due to lack of tensile control. While ensuring the performance of the non-woven fabric during air tightness tests, the atomized material soaking the surface of the non-woven fabric is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of nonwoven fabric detection, and more specifically, to a nonwoven fabric web defect detection device and a detection method thereof. Background Art

[0002] Non-woven fabric refers to a cloth-like product made of chemical fiber as the basic raw material and bonded by chemical (or hot melt). Non-woven fabric is a non-woven fabric that directly uses polymer chips, short fibers or filaments to form a net through air flow or machinery, and then reinforced by water spunlace, needle punching or hot rolling, and finally finished in the later stage.

[0003] Non-woven fabrics are widely used in the medical and clothing industries. The indicators that affect the performance of non-woven fabrics include tensile strength and air tightness. Therefore, it is necessary to test the tensile strength and air tightness of non-woven fabrics. Existing non-woven fabrics generally need to be tested in both the horizontal and vertical directions for tensile testing, but the tensile strength tests in these two directions are generally conducted separately. This will also cause the non-woven fabric to deform in the other direction due to the lack of corresponding tension control during the tensile test in one direction, thereby affecting the tensile strength test results. On the other hand, impurities and thread ends attached to the surface of non-woven fabrics during the production process will also interfere with the tensile strength test results.

[0004] At the same time, during the air tightness test of non-woven fabrics, the convection of cold air and saturated hot steam can be used to reflect the air tightness of non-woven fabrics. If the air tightness of the non-woven fabric is not good, the cold air and saturated hot steam will combine to form atomizers. The above detection method cannot handle the atomizers. Instead, the atomizers will soak the non-woven fabrics after gathering in large quantities. Although some devices heat the non-woven fabrics to keep the temperature of the non-woven fabrics consistent with that of the saturated hot steam to prevent the atomizers from soaking the non-woven fabrics. However, the heating process still damages the performance of the non-woven fabric materials. Therefore, it is necessary to avoid changes in the performance of the non-woven fabrics themselves while preventing the atomizers from soaking the non-woven fabrics. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a non-woven fabric web defect detection device and a detection method thereof for removing impurities and thread ends before testing to avoid interference with the tensile strength test results. The longitudinal tensile test and the transverse tensile test assist each other to avoid deformation of the non-woven fabric due to lack of tension control. While ensuring the performance of the non-woven fabric during air tightness testing, the atomized material can be prevented from wetting the surface of the non-woven fabric.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A non-woven web defect detection device comprises a mounting base, the mounting base comprises a horizontally arranged workbench, a pretreatment unit, a longitudinal tensile test unit, a transverse tensile test unit and an air tightness test unit are sequentially mounted on the top of the workbench; the pretreatment unit comprises a pre-pressing assembly mounted at one end of the workbench, a debris cleaning assembly arranged on one side of the pre-pressing assembly and a thread cleaning assembly mounted on the debris cleaning assembly, the pre-pressing assembly comprises two groups of pressing rollers arranged in a vertical direction, the debris cleaning assembly comprises a cleaning base and a cleaning brush roller mounted on the cleaning base, the thread cleaning assembly comprises two groups of cleaning scrapers arranged in a vertical direction, and the side walls of the cleaning scrapers are provided with inclined blade heads; the longitudinal tensile test unit comprises a first rolling assembly and a second rolling assembly arranged along the length direction of the workbench Rolling assembly, the first rolling assembly and the second rolling assembly are both equipped with a pre-tensioning roller and a tensioning roller; the lateral tension test unit includes a first stretching assembly and a second stretching assembly arranged along the width direction of the workbench, the first stretching assembly and the second stretching assembly both include an adjustment module installed on the top of the workbench and a stretching module slidably installed on the adjustment module, and the stretching module is equipped with a stretching plate that can clamp the non-woven fabric; the air tightness test unit includes an air tightness detection assembly and two groups of auxiliary clamping assemblies symmetrically arranged about the air tightness detection assembly, the auxiliary clamping assembly includes a lifting roller and a rotating roller arranged in the vertical direction, and the air tightness detection assembly includes a detection box, a feeding port opened on the detection box, an inclined top cover installed on the top of the detection box, and a steam collecting tank installed at the bottom of the inclined top cover.

[0008] The present invention is further configured as follows: the pre-compression assembly includes two groups of symmetrically arranged pre-compression frames, an upper compression member and a lower compression member are slidably installed between the two groups of pre-compression frames, and compression rollers are installed on the upper compression member and the lower compression member; two groups of cleaning brush rollers are rotatably installed inside the cleaning base, and a thread cleaning assembly is installed on the side away from the pre-compression assembly.

[0009] The present invention is further configured as follows: the thread end cleaning assembly includes two groups of cleaning frames arranged symmetrically, two groups of cleaning scrapers are slidably mounted on the cleaning frames, the two groups of inclined blade heads are arranged facing each other and are arranged on the cleaning scrapers close to the cleaning brush roller.

[0010] By adopting the above technical solution, when the non-woven fabric passes through the gap between the two sets of cleaning brush rollers, it can drive the cleaning brush roller to rotate. During the rotation of the cleaning brush roller, the cleaning brush head can clean the debris on the surface of the non-woven fabric. When the non-woven fabric passes through the gap between the two sets of cleaning scrapers, the two sets of cleaning mounting parts slide along the direction of the cleaning frame, so that the inclined blade heads on the two sets of cleaning scrapers fit the non-woven fabric. During the movement of the non-woven fabric, the inclined blade heads can clean the thread ends on the surface of the non-woven fabric.

[0011] The present invention is further configured as follows: the first rolling assembly and the second rolling assembly have the same structure and are arranged facing each other; the first rolling assembly and the second rolling assembly both include two sets of rolling mounting frames symmetrically installed on the top of the workbench; and a set of connecting parts are installed on the side walls of the two sets of rolling mounting frames close to the center.

[0012] The present invention is further configured as follows: a pre-tensioning roller and a tensioning roller are rotatably installed between the two groups of connecting parts, the pre-tensioning roller is installed on the side away from the center of the workbench, and the tensioning roller is installed on the side close to the center of the workbench, and its height is higher than the height of the pre-tensioning roller.

[0013] The present invention is further configured as follows: the first stretching assembly and the second stretching assembly have the same structure and are arranged facing each other; the adjustment module is arranged along the width direction of the workbench and an adjustment block is slidably installed on the top thereof, and the stretching module is installed on the top of the adjustment block.

[0014] The present invention is further configured as follows: the stretching module comprises a stretching frame arranged in a vertical direction, a stretching block is slidably mounted on the stretching frame, and two groups of stretching plates are respectively mounted on the stretching frame and the side wall of the stretching block, and the two are symmetrically arranged.

[0015] By adopting the above technical solution, the non-woven fabric first passes through the pre-tension roller and the tension roller on the first rolling assembly, and then passes through the tension roller and the pre-tension roller on the second rolling assembly. The non-woven fabric is tensioned for longitudinal tensile strength testing by rotating the pre-tension roller and the tension roller on the first rolling assembly and the second rolling assembly. The stretching cylinder drives the stretching block to slide along the stretching slide rail, so that the two sets of stretching plates are close to each other. After the non-woven fabric is clamped from both sides of the non-woven fabric, the adjustment drive drives the adjustment block to slide along the adjustment slide rail, thereby synchronously driving the stretching module to slide, and the non-woven fabric is tested for transverse tensile strength.

[0016] The present invention is further configured as follows: the auxiliary clamping assembly comprises two groups of auxiliary frames which are symmetrically arranged, a rotating roller is rotatably installed in the middle of the auxiliary frame, and a lifting roller is slidably installed on the top of the auxiliary frame.

[0017] The present invention is further configured as follows: the steam collecting tank is configured as a rectangular frame structure with an open top and is arranged along the length direction of the detection box; the inclined top cover is inclined, and the steam collecting tank is arranged at the bottom of its lower end.

[0018] By adopting the above technical solution, when the non-woven fabric passes through the gap between the lifting roller and the rotating roller, the driving cylinder is extended and retracted to drive the lifting roller to slide in the vertical direction. After the non-woven fabric is pressed, the driving motor drives the rotating roller to rotate, thereby conveying the non-woven fabric. A desiccant that changes color when exposed to water is arranged on the inclined top cover. The atomized material formed by the combination of cold air and saturated hot steam will change color when combined with the desiccant, which is convenient for judging the air tightness of the non-woven fabric. After the reaction with the desiccant is completed, the excess atomized material can enter the steam collecting tank for collection.

[0019] A method for detecting defects in a nonwoven web, according to the nonwoven web defect detection device described above, comprises the following steps:

[0020] S1. The non-woven fabric passes through the pre-pressing assembly. After the two sets of pressing rollers tension the non-woven fabric, the cleaning brush roller cleans the debris on the non-woven fabric, and the cleaning scraper cleans the inclined blade on the non-woven fabric;

[0021] S2, after the non-woven fabric is cleaned, it passes through the pre-tensioning roller and the tensioning roller on the first rolling assembly and the second rolling assembly in sequence for tensioning;

[0022] S3, two sets of stretching modules on both sides of the non-woven fabric clamp the non-woven fabric from both sides;

[0023] S4, the pre-tensioning roller and the tensioning roller on the first rolling assembly and the second rolling assembly are continuously tensioned to perform a longitudinal tension test on the non-woven fabric;

[0024] S5. After the longitudinal tensile test is completed, the adjustment module drives the stretching module to move along the width direction of the workbench to perform a transverse tensile test;

[0025] S6. After the tensile test is completed, the non-woven fabric first passes through the gap between the lifting roller and the rotating roller, enters the testing box from the feeding port, and then passes through the feeding port at the other end to enter another set of auxiliary clamping components;

[0026] S7. The non-woven fabric is tested for air tightness inside the test box.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. First, use the cleaning brush roller to clean the debris on the surface of the non-woven fabric, and then use the inclined blade on the cleaning scraper to clean the thread ends on the surface of the non-woven fabric. Different from the traditional method of removing impurities and thread ends on the surface of the non-woven fabric by shaking, the combination of the debris cleaning component and the thread end cleaning component can make the non-woven fabric cleaned in a tensioned state. While removing debris to avoid affecting the tensile strength test results, it can also prevent the shaking of the non-woven fabric from affecting the tensile strength test results.

[0029] 2. When the pre-tensioning roller and the tensioning roller on the first rolling assembly and the second rolling assembly tension the non-woven fabric for longitudinal tensile strength test, the two sets of stretching plates can clamp the non-woven fabric from the side of the non-woven fabric to avoid deformation of the non-woven fabric due to lack of lateral tension control during the longitudinal tensile strength test, which affects the longitudinal tensile strength test result; when the two sets of stretching modules move away from each other to perform lateral tensile strength test on the non-woven fabric, the pre-tensioning roller and the tensioning roller can keep the non-woven fabric in a tensioned state to avoid deformation of the non-woven fabric due to lack of longitudinal tension control during the lateral tensile strength test, which affects the lateral tensile strength test result.

[0030] 3. By placing a desiccant that changes color when exposed to water on the inclined top cover, the atomized product formed by the cold air and saturated hot steam will change color when combined with the desiccant, making it easier to judge the air tightness of the non-woven fabric. A steam collecting tank is set at the bottom of the inclined top cover. After the reaction with the desiccant is completed, the excess atomized product can enter the steam collecting tank for collection, effectively preventing the atomized product from soaking the surface of the non-woven fabric while ensuring that the performance of the non-woven fabric itself does not change. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the nonwoven web defect detection equipment of the present invention.

[0032] Figure 2 It is a schematic diagram of the explosion structure of the nonwoven web defect detection equipment of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the pre-compression assembly in the present invention.

[0034] Figure 4 It is a schematic diagram of the exploded structure of the debris cleaning component and the thread end cleaning component in the present invention.

[0035] Figure 5 It is a schematic diagram of the structure of the cleaning brush head of the present invention.

[0036] Figure 6 It is a structural schematic diagram of the thread end cleaning component in the present invention.

[0037] Figure 7 It is a schematic diagram of the exploded structure of the first rolling assembly in the present invention.

[0038] Figure 8 It is a schematic diagram of the exploded structure of the first stretching component in the present invention.

[0039] Fig. 9 It is a schematic diagram of the explosion structure of the stretching module in the present invention.

[0040] Fig.10 It is a schematic diagram of the explosion structure of the regulating module in the present invention.

[0041] Fig.11 It is a schematic diagram of the exploded structure of the auxiliary clamping assembly in the present invention.

[0042] Fig.12 It is a schematic diagram of the explosion structure of the airtightness detection component in the present invention.

[0043] Description of reference numerals: 1, mounting base; 11, working table; 12, supporting foot;

[0044] 2. Pretreatment unit; 21. Pre-pressing assembly; 211. Pre-pressing frame; 212. Pressing slide rail; 213. Upper pressing member; 214. Lower pressing member; 215. Pressing roller; 22. Debris cleaning assembly; 221. Cleaning base; 222. Cleaning brush roller; 223. Cleaning brush head; 23. Thread cleaning assembly; 231. Cleaning frame; 232. Cleaning mounting member; 233. Cleaning scraper; 234. Tilt blade;

[0045] 3. Longitudinal tensile test unit; 31. First rolling assembly; 311. Rolling mounting frame; 312. Connector; 313. Pre-tensioning roller shaft; 314. Tensioning roller shaft; 32. Second rolling assembly;

[0046] 4. Transverse tensile force test unit; 41. First tensile assembly; 411. Tensile module; 4111. Tensile frame; 4112. Tensile slide rail; 4113. Tensile cylinder; 4114. Tensile block; 4115. Tensile plate; 412. Adjustment module; 4121. Adjustment slide rail; 4122. Adjustment block; 4123. Adjustment drive; 42. Second tensile assembly;

[0047] 5. Air tightness test unit; 51. Auxiliary clamping assembly; 511. Auxiliary frame; 512. Lifting roller; 513. Driving cylinder; 514. Rotating roller; 515. Driving motor; 52. Air tightness detection assembly; 521. Detection box; 522. Feeding port; 523. Inclined top cover; 524. Steam collecting tank. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0050] See also Figure 1-12 , the present invention provides the following technical solutions:

[0051] For example, see Figure 1-6, including a mounting base 1 and a pretreatment unit 2. The pretreatment unit 2 is mounted on the top of the mounting base 1 and can clean the debris and thread ends on the surface of the non-woven fabric before the tensile strength test. The mounting base 1 includes a horizontally arranged workbench 11. The pretreatment unit 2, the longitudinal tensile test unit 3, the transverse tensile test unit 4 and the air tightness test unit 5 are sequentially mounted on the top of the workbench 11. Support legs 12 are arranged at the four corners of the bottom of the workbench 11, and the support legs 12 can provide support for the entire device.

[0052] See also Figure 1-6 The pretreatment unit 2 includes a pre-pressing component 21 installed at one end of the workbench 11, a debris cleaning component 22 arranged at one side of the pre-pressing component 21, and a thread cleaning component 23 installed on the debris cleaning component 22. The pre-pressing component 21 can tension the non-woven fabric. After the non-woven fabric is tensioned, it first passes through the debris cleaning component 22 to clean the debris on the surface, and then passes through the thread cleaning component 23 to remove the thread on the surface. Through the cooperation of the debris cleaning component 22 and the thread cleaning component 23, the debris and thread on the surface of the non-woven fabric are removed before the tensile strength test to avoid affecting the test results.

[0053] See also Figure 1-6 The pre-pressing assembly 21 includes two groups of symmetrically arranged pre-pressing frames 211. The pre-pressing frames 211 are vertically installed on the top of the workbench 11, and a pressing slide rail 212 is provided on the side wall close to the center of the workbench 11. An upper pressing member 213 and a lower pressing member 214 are slidably connected between the two groups of pressing slide rails 212. The upper pressing member 213 and the lower pressing member 214 have the same structure, and the upper pressing member 213 is installed on the top of the lower pressing member 214. A pressing roller 215 is rotatably installed on both the upper pressing member 213 and the lower pressing member 214. After the non-woven fabric passes through the gap between the upper pressing member 213 and the lower pressing member 214, the upper pressing member 213 and the lower pressing member 214 slide along the pressing slide rail 212, thereby tensioning the non-woven fabric, and then the non-woven fabric is transported by the rotation of the pressing roller 215.

[0054] See also Figure 1-6 The debris cleaning assembly 22 includes a cleaning base 221 installed on the top of the workbench 11. A cleaning brush roller 222 is installed on the side of the cleaning base 221 close to the pre-pressing assembly 21, and a thread cleaning assembly 23 is installed on the side away from the pre-pressing assembly 21. Two groups of cleaning brush rollers 222 are symmetrically arranged in the vertical direction and are rotatably installed inside the cleaning base 221. Each group of cleaning brush rollers 222 is surrounded by a plurality of cleaning brush heads 223. When the non-woven fabric passes through the gap between the two groups of cleaning brush rollers 222, it can drive the cleaning brush rollers 222 to rotate. During the rotation of the cleaning brush rollers 222, the cleaning brush heads 223 can clean the debris on the surface of the non-woven fabric.

[0055] See also Figure 1-6 The thread cleaning assembly 23 includes two sets of cleaning frames 231 arranged symmetrically. The two sets of cleaning frames 231 are vertically mounted on the top of the workbench 11, and two sets of cleaning mounting parts 232 are mounted on the side wall slidingly close to the center of the workbench 11. A cleaning scraper 233 is mounted between the two sets of cleaning mounting parts 232, and the two sets of cleaning scrapers 233 are arranged in the vertical direction. The side wall of the cleaning scraper 233 close to the cleaning brush roller 222 is provided with an inclined blade head 234, and the two sets of inclined blade heads 234 are arranged facing each other. When the non-woven fabric passes through the gap between the two sets of cleaning scrapers 233, the two sets of cleaning mounting parts 232 slide along the direction of the cleaning frame 231, so that the inclined blade heads 234 on the two sets of cleaning scrapers 233 are attached to the non-woven fabric. When the non-woven fabric moves, the inclined blade heads 234 can clean the thread ends on the surface of the non-woven fabric.

[0056] First, the cleaning brush roller 222 is used to clean the debris on the surface of the non-woven fabric, and then the inclined blade head 234 on the cleaning scraper 233 is used to clean the thread ends on the surface of the non-woven fabric. Different from the traditional method of removing impurities and thread ends on the surface of the non-woven fabric by shaking, the cooperation of the debris cleaning component 22 and the thread end cleaning component 23 can make the non-woven fabric cleaned in a tensioned state. While removing the debris to avoid affecting the tensile strength test results, it can also prevent the shaking of the non-woven fabric from affecting the tensile strength test results.

[0057] For example 2, please refer to Figure 1-2 and Figure 7-10 , the second embodiment makes the following improvements on the basis of the first embodiment. Although the debris and thread ends on the surface of the non-woven fabric can be cleaned by the cooperation of the debris cleaning component 22 and the thread end cleaning component 23 to prevent them from affecting the subsequent tensile strength test results. However, during the longitudinal tensile strength test and the transverse tensile strength test, the other direction of the non-woven fabric will be deformed due to the lack of corresponding tension control, thereby affecting the tensile strength test results. Therefore, it is necessary to set up a longitudinal tensile test unit 3 and a transverse tensile test unit 4, which cooperate with each other to complete the longitudinal tensile strength test and the transverse tensile strength test, and provide corresponding tension control for the non-woven fabric, so as to prevent the non-woven fabric from being deformed in another direction during the tensile strength test, which affects the accuracy of the test results.

[0058] See also Figure 1-2 and Figure 7-10The longitudinal tensile test unit 3 includes a first rolling assembly 31 and a second rolling assembly 32 arranged along the length direction of the workbench 11. The first rolling assembly 31 and the second rolling assembly 32 have the same structure and are arranged facing each other. The first rolling assembly 31 and the second rolling assembly 32 each include two sets of rolling mounting frames 311 symmetrically installed on the top of the workbench 11, and a set of connecting members 312 are installed on the side walls of the two sets of rolling mounting frames 311 close to the center. A pre-tensioning roller 313 and a tensioning roller 314 are rotatably installed between the two sets of connecting members 312. The pre-tensioning roller 313 is installed on the side away from the center of the workbench 11, and the tensioning roller 314 is installed on the side close to the center of the workbench 11, and its height is higher than the height of the pre-tensioning roller 313. When conducting the longitudinal tensile strength test, the non-woven fabric first passes through the pre-tensioning roller 313 and the tensioning roller 314 on the first rolling assembly 31, and then passes through the tensioning roller 314 and the pre-tensioning roller 313 on the second rolling assembly 32. Through the rotation of the pre-tensioning roller 313 and the tensioning roller 314 on the first rolling assembly 31 and the second rolling assembly 32, the non-woven fabric is tensioned for the longitudinal tensile strength test.

[0059] See also Figure 1-2 and Figure 7-10 The lateral tensile test unit 4 includes a first tensile assembly 41 and a second tensile assembly 42 arranged along the width direction of the workbench 11. The first tensile assembly 41 and the second tensile assembly 42 have the same structure and are arranged opposite to each other. The first tensile assembly 41 and the second tensile assembly 42 both include an adjustment module 412 installed on the top of the workbench 11 and a tensile module 411 slidably installed on the adjustment module 412. The adjustment module 412 includes an adjustment rail 4121 arranged along the width direction of the workbench 11, and the adjustment rail 4121 is connected to an adjustment drive 4123 on the side away from the center of the workbench 11. An adjustment block 4122 is slidably installed on the top of the adjustment rail 4121, and a tensile module 411 is installed on the top of the adjustment block 4122. The adjustment drive 4123 can drive the adjustment block 4122 to slide along the direction of the adjustment rail 4121, thereby synchronously driving the tensile module 411 to adjust its position.

[0060] See also Figure 1-2 and Figure 7-10The stretching module 411 includes a stretching frame 4111 arranged in the vertical direction. The stretching frame 4111 is installed on the top of the adjustment block 4122, and a stretching slide rail 4112 is arranged on the side wall close to the center of the workbench 11 in the vertical direction. A stretching block 4114 is slidably installed on the stretching slide rail 4112, and a stretching cylinder 4113 is connected to the top of the stretching block 4114. A group of stretching plates 4115 are installed on the side wall of the stretching block 4114 close to the workbench 11, and a group of stretching plates 4115 are installed on the side wall of the stretching frame 4111. The height of the stretching plates 4115 on the stretching frame 4111 is higher than the height of the stretching plates 4115 on the stretching block 4114, and the two groups of stretching plates 4115 are symmetrically arranged. The stretching cylinder 4113 drives the stretching block 4114 to slide along the stretching slide rail 4112, so that the two sets of stretching plates 4115 are close to each other. After the non-woven fabric is clamped from both sides of the non-woven fabric, the adjustment drive 4123 drives the adjustment block 4122 to slide along the adjustment slide rail 4121, thereby synchronously driving the stretching module 411 to slide, and performing the transverse tensile strength test on the non-woven fabric.

[0061] When the pre-tensioning roller 313 and the tensioning roller 314 on the first rolling assembly 31 and the second rolling assembly 32 tension the non-woven fabric for longitudinal tensile strength test, the two sets of stretching plates 4115 can clamp the non-woven fabric from the side of the non-woven fabric to avoid deformation of the non-woven fabric due to lack of lateral tension control during the longitudinal tensile strength test, which affects the longitudinal tensile strength test result; when the two sets of stretching modules 411 move away from each other to perform lateral tensile strength test on the non-woven fabric, the pre-tensioning roller 313 and the tensioning roller 314 can keep the non-woven fabric in a tensioned state to avoid deformation of the non-woven fabric due to lack of longitudinal tension control during the lateral tensile strength test, which affects the lateral tensile strength test result.

[0062] For example 3, please refer to Figure 1-2 and Figure 11-12 , this embodiment 3 makes the following improvements on the basis of embodiment 2. Although through the cooperation of the longitudinal tensile test unit 3 and the transverse tensile test unit 4, it is possible to provide corresponding tensile control for the non-woven fabric while completing the longitudinal tensile strength test and the transverse tensile strength test, avoiding deformation in the other direction during the test to affect the test results. However, during the air tightness test of the non-woven fabric, if the air tightness is poor, the atomizer generated by the contact between the cold air and the saturated hot steam will re-wet the surface of the non-woven fabric, and heating the non-woven fabric will cause the performance of the non-woven fabric to be affected. Therefore, it is necessary to set up an air tightness test unit 5 to avoid the atomizer from wetting the non-woven fabric while avoiding changes in the performance of the non-woven fabric itself.

[0063] See also Figure 1-2 and Figure 11-12The air tightness test unit 5 includes an air tightness detection component 52 and two groups of auxiliary clamping components 51 symmetrically arranged about the air tightness detection component 52. The two groups of auxiliary clamping components 51 can make the non-woven fabric enter the air tightness detection component 52 in a tensioned state for detection. The auxiliary clamping component 51 includes two groups of auxiliary frames 511 symmetrically arranged. A rotating roller 514 is rotatably installed in the middle of the auxiliary frame 511, and a driving motor 515 is connected to one end of the rotating roller 514. A lifting roller 512 is slidably installed on the top of the auxiliary frame 511, and a group of driving cylinders 513 are respectively installed at both ends of the top of the lifting roller 512. When the non-woven fabric passes through the gap between the lifting roller 512 and the rotating roller 514, the driving cylinder 513 is extended and retracted to drive the lifting roller 512 to slide in the vertical direction. After the non-woven fabric is pressed, the driving motor 515 drives the rotating roller 514 to rotate, thereby conveying the non-woven fabric.

[0064] See also Figure 1-2 and Figure 11-12 The air tightness detection component 52 includes a detection box 521 set as a hollow rectangular structure, and the side walls of the detection box 521 are provided with feeding ports 522. The width of the feeding port 522 is adapted to the width of the non-woven fabric, and the non-woven fabric can enter the inside of the detection box 521 through the feeding port 522, and then pass out from the feeding port 522 after completing the air tightness detection. An inclined top cover 523 is installed on the top of the detection box 521. The inclined top cover 523 is inclined. A desiccant that changes color when it encounters water is arranged on the inclined top cover 523. The atomized product formed by the combination of cold air and saturated hot steam will change color when combined with the desiccant, which is convenient for judging the air tightness of the non-woven fabric. A steam collecting tank 524 is arranged at the bottom of the inclined top cover 523. The steam collecting tank 524 is installed on the inner side wall of the detection box 521, and the inclined top cover 523 is arranged at the bottom of the lower end. The steam collecting tank 524 is configured as a rectangular frame structure with an open top and is disposed along the length direction of the detection box 521 . After the reaction with the desiccant is completed, the excess atomized matter can enter the steam collecting tank 524 for collection.

[0065] By setting a desiccant that changes color when exposed to water on the inclined top cover 523, the atomized matter formed by the cold air and saturated hot steam combined with the desiccant will change color, making it easier to judge the air tightness of the non-woven fabric. A steam collecting tank 524 is set at the bottom of the inclined top cover 523. After the reaction with the desiccant is completed, the excess atomized matter can enter the steam collecting tank 524 for collection, effectively preventing the atomized matter from soaking the surface of the non-woven fabric, while also ensuring that the performance of the non-woven fabric itself is not changed.

[0066] Embodiment 4, a method for detecting defects in a nonwoven web, according to the above-mentioned nonwoven web defect detection device, comprises the following steps:

[0067] S1, the non-woven fabric passes through the pre-pressing assembly 21, and after the two sets of pressing rollers 215 tension the non-woven fabric, the cleaning brush roller 222 cleans the debris on the non-woven fabric, and the cleaning scraper 233 cleans the inclined blade head 234 on the non-woven fabric;

[0068] S11, the non-woven fabric passes through the gap between the upper pressing member 213 and the lower pressing member 214, and then the upper pressing member 213 and the lower pressing member 214 slide along the pressing slide rail 212 to adjust the distance between the upper pressing member 213 and the pressing roller 215 on the lower pressing member 214, so that the non-woven fabric is tensioned;

[0069] S12, after the non-woven fabric is tensioned, it continues to pass through the gap between the two sets of cleaning brush rollers 222. During this process, the two sets of cleaning brush rollers 222 rotate and the cleaning brush head 223 is used to clean the debris on the surface of the non-woven fabric;

[0070] S13, after the debris is cleaned, the non-woven fabric passes through the gap between the two sets of cleaning scrapers 233, the cleaning mounting member 232 slides relative to the cleaning frame 231 to adjust the distance between the cleaning scrapers 233, and the inclined blade head 234 on the cleaning scraper 233 is used to clean the thread ends on the non-woven fabric;

[0071] S2, after the non-woven fabric is cleaned, it passes through the pre-tensioning roller 313 and the tensioning roller 314 on the first rolling assembly 31 and the second rolling assembly 32 in sequence for tensioning;

[0072] S21, after the non-woven fabric is cleaned, it first passes through the pre-tensioning roller shaft 313 and the tensioning roller shaft 314 on the first rolling assembly 31, and then passes through the tensioning roller shaft 314 and the pre-tensioning roller shaft 313 on the second rolling assembly 32;

[0073] S22, tensioning the nonwoven fabric by rotating the pre-tensioning roller shaft 313 and the tensioning roller shaft 314 on the first rolling assembly 31 and the second rolling assembly 32;

[0074] S3, two sets of stretching modules 411 on both sides of the non-woven fabric clamp the non-woven fabric from both sides;

[0075] S31, the two sets of stretching cylinders 4113 on both sides of the non-woven fabric drive the stretching block 4114 to slide along the stretching slide rail 4112, so that the two sets of stretching plates 4115 are close to each other, and the non-woven fabric is clamped from both sides;

[0076] S4, the pre-tensioning roller 313 and the tensioning roller 314 on the first rolling assembly 31 and the second rolling assembly 32 are continuously tensioned to perform a longitudinal tension test on the non-woven fabric;

[0077] S41, by continuously rotating the pre-tensioning roller 313 and the tensioning roller 314 on the first rolling assembly 31 and the second rolling assembly 32, the non-woven fabric is continuously tensioned in the longitudinal direction, thereby performing a longitudinal tensile test on the non-woven fabric, recording the elongation length and stretching time of the non-woven fabric, and calculating the longitudinal tensile strength of the non-woven fabric;

[0078] S42, during the longitudinal tensile test, the stretching plates 4115 on both sides of the non-woven fabric maintain a clamping state for the non-woven fabric;

[0079] S5. After the longitudinal tensile test is completed, the adjustment module 412 drives the stretching module 411 to move along the width direction of the workbench 11 to perform a transverse tensile test;

[0080] S51, after the longitudinal tensile test is completed, the adjusting block 4122 is driven to slide along the direction of the adjusting slide rail 4121 by adjusting the driving unit 4123, so that the two sets of stretching modules 411 are moved away from the center of the workbench 11, thereby performing a transverse tensile test on the non-woven fabric, recording the elongation length and stretching time of the non-woven fabric being stretched, and calculating the longitudinal tensile strength of the non-woven fabric;

[0081] S52, during the transverse tension test, the first rolling assembly 31 and the second rolling assembly 32 at both ends of the non-woven fabric keep the non-woven fabric in a tensioned state;

[0082] S6. After the tensile test is completed, the non-woven fabric first passes through the gap between the lifting roller 512 and the rotating roller 514, enters the interior of the testing box 521 from the material passing port 522, and then passes out from the material passing port 522 at the other end to enter the interior of another set of auxiliary clamping components 51;

[0083] S61, after the tension test is completed, the non-woven fabric first passes through the gap between the lifting roller 512 and the rotating roller 514, and the lifting roller 512 is driven to slide in the vertical direction by the driving cylinder 513, and the distance between the lifting roller 512 and the rotating roller 514 is adjusted to tension the non-woven fabric;

[0084] S62, after the non-woven fabric is tensioned, it passes through the material opening 522 at one end of the auxiliary clamping assembly 51 and enters the interior of the auxiliary frame 511, and then passes through the material opening 522 at the other end of the detection box 521 and enters the interior of another set of auxiliary clamping assemblies 51;

[0085] S63, the non-woven fabric passes through the gap between the lifting roller 512 and the rotating roller 514 on another set of auxiliary clamping components 51, and the lifting roller 512 is driven to slide in the vertical direction by the driving cylinder 513, and the distance between the lifting roller 512 and the rotating roller 514 is adjusted to tension the non-woven fabric;

[0086] S7. The nonwoven fabric is tested for air tightness inside the testing box 521;

[0087] S71, when the non-woven fabric is inside the detection box 521, cold air is introduced into the inner space of the detection box 521 at the bottom of the non-woven fabric, and saturated hot steam is introduced into the inner space of the detection box 521 at the top of the non-woven fabric. If the air tightness of the non-woven fabric is poor, the cold air will overflow upward and combine with the saturated hot steam to form atomized matter;

[0088] S72, after the atomized material is formed, it moves upward under the action of saturated hot steam and contacts the inclined top cover 523 on the top of the detection box 521, so that the desiccant on the inclined top cover 523 changes color when it comes into contact with water, which is convenient for observation;

[0089] S73. If there is too much atomized material and some remains after the desiccant reaction is completed, the atomized material can be collected by the steam collecting tank 524 at the bottom of the tilted top cover 523.

[0090] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A nonwoven web defect detection device, characterized in that: The invention comprises a mounting base (1), wherein the mounting base (1) comprises a horizontally arranged workbench (11), and a pretreatment unit (2), a longitudinal tensile force test unit (3), a transverse tensile force test unit (4) and an airtightness test unit (5) are sequentially mounted on the top of the workbench (11); The pre-treatment unit (2) comprises a pre-pressing assembly (21) mounted at one end of the workbench (11), a debris cleaning assembly (22) arranged at one side of the pre-pressing assembly (21), and a thread cleaning assembly (23) mounted on the debris cleaning assembly (22); the pre-pressing assembly (21) comprises two groups of pressing rollers (215) arranged in a vertical direction; the debris cleaning assembly (22) comprises a cleaning base (221) and a cleaning brush roller (222) mounted on the cleaning base (221); the thread cleaning assembly (23) comprises two groups of cleaning scrapers (233) arranged in a vertical direction; and the side walls of the cleaning scrapers (233) are provided with inclined blade heads (234); The longitudinal tension test unit (3) comprises a first rolling assembly (31) and a second rolling assembly (32) arranged along the length direction of the workbench (11), and the first rolling assembly (31) and the second rolling assembly (32) are both installed with a pre-tensioning roller shaft (313) and a tensioning roller shaft (314); The transverse tensile force testing unit (4) comprises a first stretching assembly (41) and a second stretching assembly (42) arranged along the width direction of the workbench (11), the first stretching assembly (41) and the second stretching assembly (42) both comprising an adjustment module (412) mounted on the top of the workbench (11) and a stretching module (411) slidably mounted on the adjustment module (412), and a stretching plate (4115) capable of clamping the non-woven fabric being mounted on the stretching module (4111); The air tightness test unit (5) comprises an air tightness detection component (52) and two groups of auxiliary clamping components (51) symmetrically arranged with respect to the air tightness detection component (52); the auxiliary clamping component (51) comprises a lifting roller (512) and a rotating roller (514) arranged in a vertical direction; the air tightness detection component (52) comprises a detection box (521), a material passage opening (522) opened on the detection box (521), an inclined top cover (523) installed on the top of the detection box (521), and a steam collecting tank (524) installed at the bottom of the inclined top cover (523); a desiccant that changes color when in contact with water is arranged on the inclined top cover (523).

2. The nonwoven web defect detection device according to claim 1, characterized in that: The pre-pressing assembly (21) comprises two groups of pre-pressing frames (211) which are symmetrically arranged, an upper pressing member (213) and a lower pressing member (214) being slidably mounted between the two groups of pre-pressing frames (211), and a pressing roller (215) being mounted on both the upper pressing member (213) and the lower pressing member (214); Two groups of cleaning brush rollers (222) are rotatably mounted inside the cleaning base (221), and a thread cleaning assembly (23) is mounted on the side away from the pre-pressing assembly (21).

3. The nonwoven web defect detection device according to claim 2, characterized in that: The thread end cleaning assembly (23) comprises two groups of cleaning frames (231) arranged symmetrically, two groups of cleaning scrapers (233) being slidably mounted on the cleaning frames (231), and the two groups of inclined blade heads (234) being arranged facing each other and arranged on the cleaning scrapers (233) on a side close to the cleaning brush roller (222).

4. The nonwoven web defect detection device according to claim 1, characterized in that: The first rolling assembly (31) and the second rolling assembly (32) have the same structure and are arranged facing each other. The first rolling assembly (31) and the second rolling assembly (32) both comprise two groups of rolling mounting frames (311) symmetrically mounted on the top of the workbench (11), and a group of connecting pieces (312) are mounted on the side walls of the two groups of rolling mounting frames (311) close to the center.

5. The nonwoven web defect detection device according to claim 4, characterized in that: A pre-tensioning roller (313) and a tensioning roller (314) are rotatably mounted between the two groups of connecting members (312); the pre-tensioning roller (313) is mounted on a side away from the center of the workbench (11); and the tensioning roller (314) is mounted on a side close to the center of the workbench (11) and its height is higher than that of the pre-tensioning roller (313).

6. The nonwoven web defect detection device according to claim 1, characterized in that: The first stretching assembly (41) and the second stretching assembly (42) have the same structure and are arranged facing each other. The adjustment module (412) is arranged along the width direction of the workbench (11) and an adjustment block (4122) is slidably mounted on the top of the adjustment block (4122). The stretching module (411) is mounted on the top of the adjustment block (4122).

7. The nonwoven web defect detection device according to claim 6, characterized in that: The stretching module (411) comprises a stretching frame (4111) arranged in a vertical direction, a stretching block (4114) being slidably mounted on the stretching frame (4111), and two groups of stretching plates (4115) being respectively mounted on the side walls of the stretching frame (4111) and the stretching block (4114), and the two are symmetrically arranged.

8. The nonwoven web defect detection device according to claim 1, characterized in that: The auxiliary clamping assembly (51) comprises two groups of auxiliary frames (511) which are symmetrically arranged, a rotating roller (514) being rotatably mounted in the middle of the auxiliary frame (511), and a lifting roller (512) being slidably mounted on the top of the auxiliary frame (511).

9. The nonwoven web defect detection device according to claim 8, characterized in that: The steam collecting tank (524) is arranged as a rectangular frame structure with an open top and is arranged along the length direction of the detection box (521); the inclined top cover (523) is arranged inclined, and the steam collecting tank (524) is arranged at the bottom of its lower end.

10. A method for detecting defects in a nonwoven web, using the nonwoven web defect detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, the non-woven fabric passes through the pre-pressing assembly (21), and after the two sets of pressing rollers (215) tension the non-woven fabric, the cleaning brush roller (222) cleans the debris on the non-woven fabric, and the cleaning scraper (233) cleans the inclined blade head (234) on the non-woven fabric; S2, after the non-woven fabric is cleaned, it passes through the pre-tensioning roller (313) and the tensioning roller (314) on the first rolling assembly (31) and the second rolling assembly (32) in sequence for tensioning; S3, two sets of stretching modules (411) on both sides of the non-woven fabric clamp the non-woven fabric from both sides; S4, the pre-tensioning roller (313) and the tensioning roller (314) on the first rolling assembly (31) and the second rolling assembly (32) are continuously tensioned to perform a longitudinal tension test on the non-woven fabric; S5. After the longitudinal tensile test is completed, the adjustment module (412) drives the stretching module (411) to move along the width direction of the workbench (11) to perform a transverse tensile test; S6. After the tensile test is completed, the non-woven fabric first passes through the gap between the lifting roller (512) and the rotating roller (514), enters the interior of the testing box (521) from the material passage opening (522), and then passes out from the material passage opening (522) at the other end and enters the interior of another set of auxiliary clamping components (51); S7. The non-woven fabric is tested for air tightness inside the testing box (521).

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