An on-line continuous detection device and detection method for spunlace nonwoven fabric

Abstract

The application discloses an online continuous detection device and method for water-jet non-woven fabric, and relates to the technical field of non-woven fabric production detection equipment. The device comprises a pressure applying module, a deformation detection module and a gas permeability detection module in sequence. The pressure applying module is used for applying pressure to the upper surface of the non-woven fabric from top to bottom at intervals. The deformation detection module comprises a deformation belt, a detection rod and an amplification detection assembly. The deformation belt comprises a flat part which is flat and always adheres to the upper surface of the non-woven fabric, and the flat part supports deformation particles. When the deformation belt runs synchronously with the non-woven fabric, the deformation particles always move on the flat part. The detection rod is vertically and slidingly connected to the lower part of the flat part. The top of the detection rod is used for keeping contact with the lower surface of the non-woven fabric. The amplification assembly is used for amplifying and detecting the vertical displacement of the detection rod. The gas permeability detection module is used for detecting the gas permeability of the deformed area of the non-woven fabric. The application has the effect of improving the non-woven fabric elasticity detection efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of non-woven fabric production detection, and in particular to an online continuous detection device and detection method for spunlace non-woven fabrics. Background Art

[0002] Flushable spunlace nonwovens are fabrics whose fiber webs are reinforced by water flow. They are primarily manufactured using hydroentanglement technology. Compared to traditional methods like heat pressing and needle punching, the fibers of spunlace nonwovens are more naturally entangled by hydraulic forces, maintaining a high degree of softness. Flushable spunlace nonwovens have a soft structure and are hydrolyzable, meaning they can be dispersed by water under certain conditions, making them easy to handle and degrade. They also typically possess good mechanical strength, making them suitable for applications requiring a certain degree of stretching or deformation, such as filter materials, wipes, and masks.

[0003] Spunlace nonwovens are typically made from synthetic fibers such as polypropylene (PP), polyester (PET), and nylon (PA), or natural fibers such as bamboo and cotton. Subsequent processes such as fiber laying and hydroentanglement strengthen the physical connections between the fibers, creating a strong fiber network. The hydroentangled nonwoven fabric is then dried to remove any residual moisture. The finished product undergoes various tests, including elasticity testing. This typically involves applying a force perpendicular to the surface, causing the fabric to straighten and deform in the direction of the applied force. During this process, testing instruments are used to measure the elasticity of the fabric.

[0004] However, the above detection method is suitable for measuring the elasticity of non-woven fabrics in a static state, and cannot be used for detection when the non-woven fabrics are continuously transported. In addition, the above detection method cannot monitor the rebound state of subsequent non-woven fabrics in real time, resulting in defects in the detection results and affecting the final quality of the non-woven fabrics. Summary of the Invention

[0005] In order to improve the problem that the existing detection device is unable to perform continuous elasticity detection on non-woven fabrics and is unable to monitor the rebound state of non-woven fabrics in real time in the chassis, which affects the final quality of the non-woven fabrics, the present application provides an online continuous detection device and detection method for spunlace non-woven fabrics.

[0006] On the one hand, the present application provides an online continuous detection device for spunlace nonwoven fabrics, which adopts the following technical solutions:

[0007] An online continuous detection device for spunlace nonwoven fabrics, comprising

[0008] A pressure module, used for applying pressure to the upper surface of the non-woven fabric from top to bottom at intervals;

[0009] The deformation detection module includes a visible belt, a detection rod, and an amplification detection component. The visible belt includes a flattening portion, which is used to flatten and always adhere to the upper surface of the non-woven fabric. The flattening portion supports a pile of visible particles. When the visible belt moves synchronously with the non-woven fabric, the visible particles always move on the flattening portion. The detection rod is connected to the bottom of the flattening portion in a corresponding vertical sliding manner. The top of the detection rod is used to maintain contact with the lower surface of the non-woven fabric. The amplification component is used to amplify the vertical displacement of the detection rod for detection;

[0010] The air permeability detection module is used to detect the air permeability of the area where the non-woven fabric is deformed.

[0011] Optionally, along the conveying direction of the non-woven fabric, the visual belt is provided with a unwinding shaft, a lifting shaft and a rewinding shaft in sequence. The unwinding shaft and the rewinding shaft are used to unwind and rewind the visual belt respectively. The lifting shaft is rotatably connected to the bottom of the visual belt. The vertical height of the lifting shaft is greater than the unwinding shaft and the rewinding shaft. The unwinding shaft is arranged close to the surface of the non-woven fabric, and the flattening part is located between the unwinding shaft and the lifting shaft.

[0012] Optionally, along the conveying direction of the non-woven fabric, both sides of the visible belt between the unwinding shaft and the lifting shaft are bent upward, and leak-proof baffles are provided along both sides of the visible belt to prevent visible particles from falling from both sides of the visible belt.

[0013] Optionally, the amplification detection component includes a limit bar, a rotating rod and a fixed shaft, the limit bars are provided with multiple vertical limit bars, every two limit bars are corresponding to each other and arranged in parallel, one end of the rotating rod is hinged to the bottom end of the detection rod, and the other end of the rotating rod is movably connected between the two corresponding limit bars, the fixed shaft is horizontally passed through the rotating rod, the horizontal distance between the fixed shaft and the detection rod is smaller than the horizontal distance between the fixed shaft and the limit bar, the rotating rod can rotate relative to the fixed shaft, and the rotation axis extends along the width direction of the non-woven fabric, and the inner side walls of the corresponding two limit bars are provided with laser position sensors for detecting the position of the rotating rod between the limit bars.

[0014] Optionally, a mounting wedge is provided at the top of the detection rod, and the mounting wedge is used to cover the width direction of the non-woven fabric. The cross-section of the mounting wedge is a triangle with the tip facing upward. A contact roller is rotatably connected to the top tip of the mounting wedge, and the top of the contact roller protrudes from the mounting wedge. The contact roller rises until the top surface is close to the lower surface of the non-woven fabric.

[0015] Optionally, the outer coaxial sleeve of the detection rod is provided with a fixed cylinder, the detection rod is vertically slidably connected to the fixed cylinder, and a return member is provided inside the fixed cylinder, which is used to keep the contact roller always in contact with the lower surface of the non-woven fabric in the detection state.

[0016] Optionally, it also includes a supporting sheet, which is arranged at corresponding intervals at both ends of the visible belt along the transportation direction of the non-woven fabric. The supporting sheet is placed horizontally and is used to be arranged close to the lower surface of the non-woven fabric to flatten the non-woven fabric.

[0017] Optionally, the air permeability detection module includes an air blowing pipe and a detector, which are distributed on the upper and lower sides of the non-woven fabric. The air blowing pipe is used to connect to an external wind source to blow air upward to the position where the non-woven fabric is deformed. The detector is located above the air blowing pipe and is used to detect the air permeability of the deformed non-woven fabric.

[0018] On the other hand, the present application provides an online continuous detection method for spunlace nonwoven fabrics, which uses the above-mentioned online continuous detection device for spunlace nonwoven fabrics to perform elasticity detection on the nonwoven fabric, comprising the following steps:

[0019] S1: First, the non-woven fabric is transported. The pressure module applies a fixed pressure from top to bottom to the non-woven fabric at a preset interval to test the elasticity of the non-woven fabric.

[0020] S2: The visible particles on the visible belt use their own gravity to highlight the deformed area of ​​the non-woven fabric downward. The downwardly protruding area of ​​the non-woven fabric pushes the detection rod downward. The downward displacement of the detection rod is amplified and detected by the amplification detection component to determine whether the final deformation amount of the deformed area of ​​the non-woven fabric is qualified;

[0021] S3: The air permeability detection module performs an air permeability test on the deformed area of ​​the non-woven fabric to determine whether the final air permeability of the deformed area of ​​the non-woven fabric is qualified;

[0022] S4: The final elasticity test result of the non-woven fabric refers to both the deformation and air permeability. When the deformation and air permeability are both qualified, the elasticity test result of the non-woven fabric is qualified; when the deformation is qualified but the air permeability is unqualified, the non-woven fabric is judged to have failed before the elasticity test; when the deformation does not exceed the preset value by 10%, but the air permeability is qualified, the non-woven fabric can continue to be used; when both the deformation and air permeability are unqualified, the elasticity test result of the non-woven fabric is judged to be unqualified.

[0023] In summary, this application has at least one of the following beneficial effects:

[0024] 1. A visible belt is provided that runs synchronously with the non-woven fabric, and piles of visible particles are supported on the visible belt. The piles of visible particles have a certain gravity of their own and good fluidity. Therefore, the visible particles piled on the visible belt have the ability to change their own stacking shape according to the shape of the external object. When the flat part of the visible belt is spread flat on the surface of the non-woven fabric, the visible particles on the visible belt will fall down by their own gravity, so that the soft visible belt will be pressed downward by the gravity of the visible particles, so that the visible belt is closely attached to the surface of the non-woven fabric. At this time, the visible particles can flow according to the deformation of the non-woven fabric surface, thereby changing the shape and position of their own stacking, so that the visible belt can completely fit the deformation area on the surface of the non-woven fabric. In the domain, after the non-woven fabric is pressed down by the pressure module, if the quality of the finished non-woven fabric is qualified, the pressed area of ​​the non-woven fabric will rebound to the initial state, or show a smaller concave deformation compared to the initial state. At this time, when the area with a smaller deformation on the non-woven fabric passes under the flat part of the visible belt, the deformed area will be pressed down by the gravity of the visible particles on the visible belt and protrude downward more obviously. The deformed area of ​​the non-woven fabric actively protrudes downward and can be more clearly detected by the detection rod, so that it is convenient to judge whether the deformation of the non-woven fabric is qualified by the displacement of the detection rod. During this detection process, the non-woven fabric does not need to be stopped for detection, so that the elasticity of the non-woven fabric can be detected online and continuously, which greatly improves the detection efficiency.

[0025] 2. When detecting the deformation of the non-woven fabric, the downward displacement of the detection rod may be small and inconvenient to measure. Therefore, the displacement can be amplified by the rotating rod hinged at the lower end of the detection rod. When the detection rod descends, the detection rod drives one end of the rotating rod to descend. At this time, the rotating rod can rotate relative to the fixed axis. After the rotating rod rotates, one end of the rotating rod between the two limit bars moves upward. Since the horizontal distance between the fixed axis and the detection rod is smaller than the horizontal distance between the fixed axis and the limit bar, according to the principle of similar triangles, the displacement of one end of the rotating rod as the detection rod descends can be amplified to the displacement of the other end of the rotating rod between the two limit bars. At this time, the amplified displacement is more easily detected by the laser position sensor. The detection rod amplifies its own displacement caused by the deformation of the non-woven fabric through the amplifying detection component, which is more conducive to detection.

[0026] 3. After the non-woven fabric has been tested for deformation, the air permeability test must be carried out on the deformed area. The comprehensive consideration of the deformation and air permeability is used to determine whether the final elasticity test result of the non-woven fabric is qualified. When both the deformation and air permeability are qualified, the elasticity test result of the non-woven fabric is qualified; when the deformation is qualified but the air permeability is unqualified, it is determined that the non-woven fabric has failed before the elasticity test. At this time, it is necessary to uniformly re-test the quality of the non-woven fabrics of the same batch to determine whether the other indicators of the non-woven fabric are qualified; when the deformation does not exceed the preset value by 10%, but the air permeability is qualified, the non-woven fabric can continue to be used. At this time, although the deformation of the non-woven fabric exceeds the preset value, the air permeability of the non-woven fabric is still qualified. As long as the deformation of the non-woven fabric does not exceed 10% of the preset value, the non-woven fabric can continue to be used, which can reduce the waste of non-woven fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram showing the overall structure of the online continuous detection device in Example 1 of the present application;

[0028] Figure 2 This is a schematic structural diagram showing part of the online continuous detection device in Example 1 of the present application;

[0029] Figure 3 is a partial cross-sectional schematic diagram showing the visible belt and the detection rod of Example 1 of the present application;

[0030] Figure 4 yes Figure 3 A schematic cross-sectional view at AA;

[0031] Figure 5 is a partial cross-sectional schematic diagram showing the amplification component of Example 1 of the present application;

[0032] Figure 6 is a partial cross-sectional schematic diagram showing the air permeability detection module in Example 1 of the present application;

[0033] Figure 7 This is a schematic structural diagram showing a portion of an online continuous detection device in Example 2 of the present application;

[0034] Figure 8 This is a schematic structural diagram showing the display pen and display paper in Example 2 of the present application.

[0035] Explanation of the accompanying drawings: 1. non-woven fabric; 2. pressure module; 21. pressure rod; 22. pressure gauge; 23. driving member; 24. flattening roller; 3. deformation detection module; 31. visible belt; 311. flattening part; 312. unwinding shaft; 313. lifting shaft; 314. rewinding shaft; 315. leak-proof baffle; 32. detection rod; 321. mounting wedge; 322. contact roller; 33. amplification detection component; 331. limit strip; 332. rotating rod; 333. fixed shaft; 334. laser position sensor; 335. display pen; 336. display paper; 34. visible particles; 4. air permeability detection module; 41. air blow pipe; 42. detector; 5. fixing cylinder; 51. return member; 6. supporting sheet. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail. Example 1

[0037] Example 1 of the present application discloses an online continuous detection device for spunlace nonwoven fabrics, referring to Figure 1 and Figure 2 The online continuous detection device includes a pressure module 2, a deformation detection module 3 and an air permeability detection module 4 in sequence along the conveying direction of the non-woven fabric 1, which is used to perform pressure elasticity detection, deformation detection and air permeability detection on the finished product of the non-woven fabric 1 in sequence, so as to comprehensively judge the quality of the non-woven fabric 1.

[0038] Specifically, the pressure module 2 includes a vertical pressure rod 21, a pressure gauge 22, and a drive member 23. The drive member 23 can be a small hydraulic cylinder or electric cylinder. The output shaft of the drive member 23 is fixedly connected vertically downward to the pressure gauge 22. The pressure rod 21 is fixedly connected to the bottom of the pressure gauge 22, and the top of the drive member 23 is fixed to fixed frames erected on both sides of the non-woven fabric 1. Along the conveying direction of the non-woven fabric 1, flattening rollers 24 are distributed on both sides of the pressure rod 21. The flattening rollers 24 are grouped in pairs, and the same group of flattening rollers 24 are distributed on the upper and lower sides of the non-woven fabric 1 respectively, and are used to flatten the non-woven fabric 1 located below the pressure rod 21, thereby facilitating the pressure rod 21 to apply pressure to the non-woven fabric 1.

[0039] The pressure rod 21 is positioned corresponding to the centerline of the non-woven fabric 1. The output shaft of the driving member 23 applies vertical downward pressure to the pressure rod 21 at intervals through the pressure gauge 22, so that the pressure rod 21 applies a downward pressure vertically downward to the upper surface of the non-woven fabric 1. The downward pressure applied by the driving member 23 is monitored in real time by the pressure gauge 22, so that a fixed pressure is always applied to the non-woven fabric 1 for elasticity testing. At this time, the non-woven fabric 1 is pressed down and deformed. Since the driving member 23 applies pressure to the non-woven fabric 1 at fixed intervals, when the pressure rod 21 is retracted, the non-woven fabric 1 with qualified elasticity will rebound to its initial state. If the elasticity of the non-woven fabric 1 in some areas is defective, there will still be a relatively obvious deformation after rebounding, but this deformation is obviously difficult to distinguish by human eyes.

[0040] In order to facilitate the detection of possible deformation of the non-woven fabric 1 after the elasticity test, refer to Figures 2 to 4 A deformation detection module 3 is provided behind the pressure module 2. The deformation detection module 3 includes a visible belt 31, a detection rod 32 and an amplifying detection component 33. The visible belt 31 can be made of a material with certain elasticity and good ductility, and the strength of the material making the visible belt 31 is lower than that of the non-woven fabric 1, that is, the visible belt 31 is more susceptible to deformation by external force than the non-woven fabric 1. Therefore, the visible belt 31 can be made of materials such as textiles (such as nylon, polyester fabrics), TPU (thermoplastic polyurethane), elastic fabrics (such as Lycra, spandex), paper velvet or elastic composite paper.

[0041] The visible strip 31 includes a flattened portion 311, which is positioned above the nonwoven fabric 1 and adheres to its upper surface. This allows the visible strip 31 to remain flat in the area of ​​the flattened portion 311. The upper surface of the flattened portion 311 supports a pile of visible particles 34, which can be large fine sand or other smooth particles of similar size. The visible particles 34 accumulate on the upper surface of the visible strip 31, and the relatively smooth upper surface of the visible strip 31 allows the visible particles 34 to slide across the surface, thereby continuously changing their stacking state. The visible belt 31 can run synchronously with the non-woven fabric 1, and the visible particles 34 always keep moving on the upper surface of the flat portion 311. Since the visible belt 31 itself has a certain elasticity and good ductility, after the visible particles 34 are accumulated on the flat portion 311, the gravity of the visible particles 34 themselves will press down the flat portion 311, and the flat portion 311 will be tightly attached to the surface of the non-woven fabric 1 under the action of the gravity of the visible particles 34, and can change its own shape according to the deformation of the surface of the non-woven fabric 1, so that the visible belt 31 can adaptively fit the deformed part of the non-woven fabric 1 under the action of the gravity of the visible particles 34, and return to a flat state after leaving, thereby achieving a close fit of the flat portion 311 to the surface of the non-woven fabric 1.

[0042] The detection rod 32 is vertically slidably connected to the bottom of the visible belt 31, and the detection rod 32 is also located below the non-woven fabric 1. Along the conveying direction of the non-woven fabric 1, the visible belt is provided with a reel 312, a lifting shaft 313, and a reel 314 in sequence. The three shafts are rotatably connected to the fixed frames on both sides, and the rotation axis is perpendicular to the conveying direction of the non-woven fabric 1. The reel 312 and reel 314 respectively unwind and reel the visible belt 31, and both the reel 312 and reel 314 can be driven to rotate by independent motors. The lifting shaft 313 is rotatably connected between the reel 312 and reel 314 and is located below the visible belt 31. The vertical height of the lifting shaft 313 is greater than that of the reel 312 and reel 314. The reel 312 is arranged close to the surface of the non-woven fabric 1, and the flattening portion 311 is located between the reel 312 and lifting shaft 313.

[0043] The visible particles 34 accumulate on the upper surface of the flattened portion 311. When the entire visible belt 31 rotates synchronously with the nonwoven fabric, the visible particles 34 on the flattened portion 311 also move with it, pulled by the visible belt 31. Because the vertical height of the lifting shaft 313 is higher than the unwinding shaft 312, the visible particles 34 near the lifting shaft 313 are also lifted. The visible particles 34 are smooth and have a certain gravity. Therefore, under the action of their own gravity, the lifted visible particles 34 gradually fall toward the lower unwinding shaft 312. As the visible belt continues to operate, the lifted visible particles 34 will continue to fall, rise, and fall again on the flattened portion 311, and this cycle continues. Under the action of the gravity of the visible particles 34, the flattened portion 311 always remains in close contact with the surface of the nonwoven fabric 1.

[0044] Furthermore, along the conveying direction of the nonwoven fabric 1, both sides of the visible belt 31 between the unwinding shaft 312 and the lifting shaft 313 are curved and tilted upward. The tilted edges of the visible belt 31 effectively prevent the visible particles 34 thereon from falling. Leakage-proof baffles 315 are also provided on both sides of the tilted edges of the visible belt 31. These baffles 315 are positioned on either side of the visible belt 31 via fixed brackets on either side. The baffles 315 have placement slots near the bottom of the visible belt 31. The two sides of the visible belt 31 slide into the placement slots of the two baffles 315, respectively, ensuring stable operation of the visible belt 31.

[0045] Further, refer to Figure 3 and Figure 5The top of the detection rod 32 is fixedly connected to a mounting wedge 321. The mounting wedge 321 has an overall triangular cross-section with the tip facing upward. A contact roller 322 is rotatably connected to the top tip of the mounting wedge 321. The rotation axis of the contact roller 322 is consistent with the width direction of the non-woven fabric 1, and the top of the contact roller 322 protrudes from the mounting wedge 321. The actual diameter of the contact roller 322 is relatively small, and the length of the contact roller 322 is smaller than the diameter of the pressure rod 21. In the initial state, the top surface of the contact roller 322 does not contact the lower surface of the non-woven fabric 1. Only when the pressure rod 21 applies pressure to the non-woven fabric 1, the contact roller 322 rises under the drive of the detection rod 32 and contacts the lower surface of the non-woven fabric 1, so that the top surface of the contact roller 322 can be closely attached to the lower surface of the non-woven fabric 1. The mounting wedge 321 covers the entire width direction of the non-woven fabric 1 , and a plurality of contact rollers 322 are also arranged at intervals, so that the contact rollers 322 can also cover the entire width direction of the non-woven fabric 1 .

[0046] The outer coaxial sleeve of the detection rod 32 is provided with a fixed cylinder 5, which is arranged on the fixed frames on both sides through a connecting rod. The detection rod 32 is vertically slidably connected to the fixed cylinder 5, and the bottom of the detection rod 32 passes through the fixed cylinder 5. A return member 51 is provided inside the fixed cylinder 5. The return member 51 can be a compression spring. The return member 51 is placed vertically. One end of the return member 51 is fixed to the side wall of the detection rod 32, and the other end of the return member 51 is fixed to the bottom wall of the fixed cylinder 5. The return member 51 can keep the contact roller 322 always in contact with the lower surface of the non-woven fabric 1 in the detection state. In Example 1 of the present application, the fixed cylinder 5 is vertically slidably connected to the fixed frames on both sides through a connecting rod. A vertical slide rail can be provided inside the fixed frame. The connecting rod corresponding to the fixed cylinder 5 is vertically slidably connected to the fixed frame through the slide rail, and a driving electric cylinder can be provided inside the fixed frame to drive the connecting rod to rise and fall together with the fixed cylinder 5. In the initial state, the fixed cylinder 5 is driven by the driving electric cylinder to descend a short height, so that the detection rod 32 and the contact roller 322 at the top descend together, so that the top of the contact roller 322 is separated from the lower surface of the non-woven fabric 1 by a short distance. Only when the pressure rod 21 applies pressure to the non-woven fabric 1, the contact roller 322 is driven by the driving electric cylinder to rise together with the detection rod 32 and the fixed cylinder 5 and contact the lower surface of the non-woven fabric 1. The length of the contact roller 322 is smaller than the diameter of the pressure rod 21, so that when the contact roller 322 contacts the non-woven fabric 1, the contact roller 322 can slide along the contour of the sunken part of the non-woven fabric 1, thereby smoothly pushing the detection rod 32 to descend.

[0047] Furthermore, the amplification detection component 33 includes a limit bar 331, a rotating rod 332 and a fixed shaft 333. The limit bar 331 is provided with two vertical bars. The bottom of the limit bar 331 is fixed to the workbench or the ground. The two limit bars 331 are arranged correspondingly and in parallel. One end of the rotating rod 332 is hinged to the bottom end of the detection rod 32, and the other end of the rotating rod 332 is slidably connected between the two corresponding limit bars 331. The fixed shaft 333 is horizontally passed through the rotating rod 332, so that the rotating rod 332 can rotate relative to the fixed shaft 333. The horizontal distance between the fixed shaft 333 and the detection rod 32 is smaller than the horizontal distance between the fixed shaft 333 and the limit bar 331, and the axis of the fixed shaft 333 extends along the width direction of the non-woven fabric.

[0048] In order to monitor the position of one end of the rotating rod 332 between the limit bars 331 in real time, a laser position sensor 334 is fixed to the inner wall of the two corresponding limit bars 331. When the rotating rod 332 rotates, one end of the rotating rod 332 will slide up and down between the two limit bars 331. In the initial state, the rotating rod 332 is in a horizontal state. When the detection rod 32 descends, the rotating rod 332 will rotate around the fixed axis 333, so that the rotating rod 332 gradually becomes an upward tilted state. The end of the rotating rod 332 between the limit bars 331 will gradually move upward. In the process of the rotating rod 332 moving upward, if it passes through the laser sensor, the real-time position of one end of the rotating rod 332 will be detected by the laser position sensor 334. The laser position sensor 334 can be connected to an external control unit to transmit the detected position information of the rotating rod 332 to the control unit. Therefore, the descent alarm trigger threshold of the detection rod 32 can be set by increasing the number of laser position sensors 334 or adjusting the specific position of the laser position sensor 334. When the descent amount of the detection rod 32 is greater than the alarm trigger threshold, the control unit sends an alarm instruction to the external alarm.

[0049] The visible belt 31 on which the visible particles 34 are piled has the ability to deform according to the shape of the external object. Since the visible particles 34 themselves have good fluidity, when the visible belt 31 is spread on the surface of the non-woven fabric 1, the visible particles 34 on the visible belt 31 will fall down by their own gravity, so that the soft visible belt 31 will be pressed downward by the gravity of the visible particles 34, so that the visible belt 31 is closely attached to the upper surface of the non-woven fabric 1. At this time, the visible belt 31 can change its own shape according to the shape of the surface of the non-woven fabric 1. After the non-woven fabric 1 is pressed down by the pressure module 2, if the finished product quality of the non-woven fabric 1 is qualified, the pressed area of ​​the non-woven fabric 1 It will rebound to its initial state, or have a smaller concave deformation compared to the initial state. At this time, when the area with a smaller deformation on the non-woven fabric 1 passes under the visible belt 31, the deformed area will be pressed down by the gravity of the visible particles 34 on the visible belt 31 and protrude downward. The deformed area of ​​the non-woven fabric 1 actively protrudes downward and can be more clearly detected by the detection rod 32, so that it is convenient to judge whether the deformation of the non-woven fabric 1 is qualified by the displacement of the downward movement of the detection rod 32. During this detection process, the non-woven fabric 1 does not need to be stopped for detection, so that the elasticity of the non-woven fabric 1 can be detected online and continuously, which greatly improves the detection efficiency.

[0050] However, when detecting the deformation of the non-woven fabric 1, the downward displacement of the detection rod 32 may be small and difficult to measure. Therefore, the displacement can be amplified by using the rotating rod 332 hinged at the lower end of the detection rod 32. Since the horizontal distance between the fixed shaft 333 and the detection rod 32 is smaller than the horizontal distance between the fixed shaft 333 and the limit bar 331, according to the principle of similar triangles, the displacement of one end of the rotating rod 332 as the detection rod 32 descends can be amplified to the displacement of the other end of the rotating rod 332 between the two limit bars 331. At this time, the amplified displacement is more easily detected by the laser position sensor 334. The detection rod 32 amplifies its own displacement caused by the deformation of the non-woven fabric 1 through the amplifying detection component 33, which is more conducive to detection. The specific length of the rotating rod 332 and the position of the fixed shaft 333 relative to the rotating rod 332 can be adjusted according to actual conditions, so that the deformation of the non-woven fabric 1 can be measured more accurately.

[0051] Reference Figure 6 The air permeability detection module 4 includes an air blowing pipe 41 and a detector 42. The air blowing pipe 41 and the detector 42 are distributed on the upper and lower sides of the non-woven fabric. The air blowing pipe 41 can be connected to an external air source such as an air pump, and the air outlet faces upward to blow air upward to the position where the non-woven fabric 1 is deformed. The detector 42 can be an air permeability detector 42, and is located above the air blowing pipe 41 and the non-woven fabric 1 to detect the air permeability of the deformed position of the non-woven fabric 1. The specific model and type of the detector 42 can refer to the conventional detector 42 on the market, and it only needs to have the air permeability detection function.

[0052] After the deformation test, the non-woven fabric 1 is also tested for air permeability in the deformed area. The final elasticity test result of the non-woven fabric 1 is determined by comprehensive consideration of the deformation and air permeability. If both the deformation and air permeability are qualified, the elasticity test result of the non-woven fabric 1 is qualified. If the deformation is qualified but the air permeability is unqualified, it is determined that the non-woven fabric 1 was unqualified before the elasticity test. At this time, it is necessary to uniformly re-test the quality of the non-woven fabric 1 in the same batch to determine whether the other indicators of the non-woven fabric 1 are qualified. If the deformation does not exceed the preset value by 10%, but the air permeability is qualified, the non-woven fabric 1 can continue to be used. At this time, although the deformation of the non-woven fabric 1 exceeds the preset value, the air permeability of the non-woven fabric 1 is still qualified. As long as the deformation of the non-woven fabric 1 does not exceed 10% of the preset value, the non-woven fabric 1 can continue to be used, which can reduce the waste of the non-woven fabric 1.

[0053] Image recognition technology is usually used in non-woven fabric production to determine the quality of non-woven fabrics. However, image recognition technology has some difficult-to-solve defects in actual use, such as limited recognition ability of complex scenes, sensitivity to angles and postures, data deviation problems, high resource consumption and real-time problems. Therefore, image recognition equipment will still have problems such as unstable output, incorrect output, and delayed output in actual use, which are not conducive to real-time monitoring of non-woven fabrics. Compared with the online continuous detection device disclosed in Example 1 of this application, the image recognition equipment also consumes a large purchase cost, which is not conducive to cost savings for enterprises.

[0054] The implementation principle of an online continuous detection device for non-woven fabrics in Example 1 of the present application is as follows: when the visible belt 31 is laid flat on the surface of the non-woven fabric 1, the visible particles 34 on the visible belt 31 will fall down by their own gravity, so that the soft visible belt 31 will be pressed downward by the gravity of the visible particles 34, so that the visible belt 31 is tightly attached to the upper surface of the non-woven fabric 1, and the area where the non-woven fabric 1 is deformed is actively highlighted downward by the visible belt 31, which can be more clearly detected by the detection rod 32. Through the amplification of the detection component 33, the smaller displacement of the detection rod 32 is amplified into a larger displacement at one end of the rotating rod 332, so that it is convenient to be detected by the laser position sensor 334. Finally, the two indicators of deformation and air permeability are combined to comprehensively determine whether the elasticity test of the non-woven fabric 1 is qualified. Example 2

[0055] The difference between Example 2 and Example 1 is that: Figure 7 and Figure 8The non-woven fabric 1 is divided into two areas along its own midline, and the driving member 23 is horizontally slidably connected to the fixed frame and can be driven by the electric cylinder so that the pressure rod 21 can apply pressure to the two areas respectively to detect elasticity. Correspondingly, the detection rod 32 and the amplification detection component 33 are also provided in two groups, respectively arranged under the two areas of the non-woven fabric 1

[0056] Furthermore, the magnification detection assembly includes two sets of display pens and display paper 336. The display pens 335 are coaxially fixed to the bottom of the two detection rods 32, and the display paper 336 is laid flat below the display pens 335. When any area of ​​the non-woven fabric 1 experiences significant deformation, the display pens 335 below the corresponding area will be driven by the detection rods 32 to draw a mark on the display paper 336, so that it can be intuitively determined which area does not meet the deformation requirements. Example 3

[0057] Example 3 of the present application discloses an online continuous detection method for non-woven fabrics, which uses the online continuous detection device for non-woven fabrics described in Example 1 or Example 2 to perform elasticity detection on the non-woven fabric, including the following steps:

[0058] S1: First, the transportation of the non-woven fabric 1 is started, and the driving member 23 applies a fixed pressure from top to bottom to the non-woven fabric 1 through the pressure rod 21 at a preset interval to test the elasticity of the non-woven fabric 1;

[0059] S2: The developing belt 31 uses the gravity of the developing particles 34 thereon to cause the deformed area of ​​the non-woven fabric 1 to protrude downward. The protruding area of ​​the non-woven fabric 1 pushes the detection rod 32 downward. The downward displacement of the detection rod 32 is amplified and detected by the amplifying detection component 33 to determine whether the final deformation amount of the deformed area of ​​the non-woven fabric 1 is qualified.

[0060] S3: The air permeability detection module 4 performs an air permeability test on the deformed area of ​​the non-woven fabric 1 to determine whether the final air permeability of the deformed area of ​​the non-woven fabric 1 is qualified;

[0061] S4: The final elasticity test result of the non-woven fabric 1 refers to both the deformation amount and the air permeability. When the deformation amount and the air permeability are both qualified, the elasticity test result of the non-woven fabric 1 is qualified; when the deformation amount is qualified but the air permeability is unqualified, it is determined that the non-woven fabric 1 has failed before the elasticity test; when the deformation amount does not exceed the preset value by 10%, but the air permeability is qualified, the non-woven fabric 1 can continue to be used; when the deformation amount and the air permeability are both unqualified, the elasticity test result of the non-woven fabric 1 is determined to be unqualified.

[0062] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An online continuous detection device for spunlace nonwoven fabrics, characterized by: Included in sequence A pressure module, used for applying pressure to the upper surface of the non-woven fabric from top to bottom at intervals; The deformation detection module includes a visible belt, a detection rod, and an amplification detection component. The visible belt includes a flattening portion, which is used to flatten and always adhere to the upper surface of the non-woven fabric. The flattening portion supports a pile of visible particles. When the visible belt moves synchronously with the non-woven fabric, the visible particles always move on the flattening portion. The detection rod is connected to the bottom of the flattening portion in a corresponding vertical sliding manner. The top of the detection rod is used to maintain contact with the lower surface of the non-woven fabric. The amplification component is used to amplify the vertical displacement of the detection rod for detection; Air permeability detection module, used to detect the air permeability of the area where the non-woven fabric is deformed; The amplification detection assembly includes a limit bar, a rotating rod and a fixed shaft. The limit bar is provided with a plurality of vertical limit bars, and every two limit bars are corresponding to each other and arranged in parallel at intervals. One end of the rotating rod is hinged to the bottom end of the detection rod, and the other end of the rotating rod is movably connected between the two corresponding limit bars. The fixed shaft is horizontally passed through the rotating rod. The horizontal distance between the fixed shaft and the detection rod is smaller than the horizontal distance between the fixed shaft and the limit bar. The rotating rod can rotate relative to the fixed shaft, and the rotation axis extends along the width direction of the non-woven fabric. The inner side walls of the corresponding two limit bars are provided with laser position sensors for detecting the position of the rotating rod between the limit bars; A mounting wedge is provided at the top of the detection rod, and the mounting wedge is used to cover the width direction of the non-woven fabric. The cross-section of the mounting wedge is a triangle with the tip facing upward. The top tip of the mounting wedge is rotatably connected to a contact roller, and the top of the contact roller protrudes from the mounting wedge. During detection, the contact roller rises until the top surface is in close contact with the lower surface of the non-woven fabric. The outer coaxial sleeve of the detection rod is provided with a fixed cylinder, and the detection rod is vertically slidably connected to the fixed cylinder. A return piece is provided inside the fixed cylinder, and the return piece is used to keep the contact roller always in contact with the lower surface of the non-woven fabric in the detection state.

2. The online continuous detection device for spunlace nonwoven fabrics according to claim 1, characterized in that: Along the conveying direction of the non-woven fabric, the unwinding shaft, lifting shaft and winding shaft are sequentially provided on the developing belt. The unwinding shaft and winding shaft are used for unwinding and winding the developing belt respectively. The lifting shaft is rotatably connected to the bottom of the developing belt. The vertical height of the lifting shaft is greater than that of the unwinding shaft and the winding shaft. The unwinding shaft is arranged close to the surface of the non-woven fabric, and the flattening part is located between the unwinding shaft and the lifting shaft.

3. The online continuous detection device for spunlace nonwoven fabrics according to claim 2, characterized in that: Along the conveying direction of the non-woven fabric, both sides of the developing belt between the unwinding shaft and the lifting shaft are bent upward, and leak-proof baffles are provided on both sides of the developing belt to prevent the developing particles from falling from both sides of the developing belt.

4. The online continuous detection device for spunlace nonwoven fabrics according to claim 1, characterized in that: It also includes a supporting sheet, which is arranged at corresponding intervals at both ends of the visible belt along the transportation direction of the non-woven fabric. The supporting sheet is placed horizontally and is used to be arranged close to the lower surface of the non-woven fabric to flatten the non-woven fabric.

5. The online continuous detection device for spunlace nonwoven fabrics according to claim 1, characterized in that: The air permeability detection module includes an air blowing pipe and a detector, which are distributed on the upper and lower sides of the non-woven fabric. The air blowing pipe is used to connect to an external air source to blow air upward at the position where the non-woven fabric is deformed. The detector is located above the air blowing pipe and is used to detect the air permeability of the deformed part of the non-woven fabric.

6. An online continuous detection method for spunlace nonwoven fabrics, characterized by: The elasticity test of the nonwoven fabric is performed using the online continuous testing device for spunlace nonwoven fabric according to any one of claims 1 to 5, comprising the following steps: S1: First, the non-woven fabric is transported. The pressure module applies a fixed pressure from top to bottom to the non-woven fabric at a preset interval to test the elasticity of the non-woven fabric. S2: The visible particles on the visible belt use their own gravity to highlight the deformed area of ​​the non-woven fabric downward. The downwardly protruding area of ​​the non-woven fabric pushes the detection rod downward. The downward displacement of the detection rod is amplified and detected by the amplification detection component to determine whether the final deformation amount of the deformed area of ​​the non-woven fabric is qualified; S3: The air permeability detection module performs an air permeability test on the deformed area of ​​the non-woven fabric to determine whether the final air permeability of the deformed area of ​​the non-woven fabric is qualified; S4: The final elasticity test result of the non-woven fabric refers to both the deformation and air permeability. When the deformation and air permeability are both qualified, the elasticity test result of the non-woven fabric is qualified; when the deformation is qualified but the air permeability is unqualified, the non-woven fabric is judged to have failed before the elasticity test; when the deformation does not exceed the preset value by 10%, but the air permeability is qualified, the non-woven fabric can continue to be used; when both the deformation and air permeability are unqualified, the elasticity test result of the non-woven fabric is judged to be unqualified.

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