Online continuous detection device and detection method for spunlace non-woven fabric

Abstract

The invention discloses an online continuous detection device and detection method for spunlace non-woven fabric, and relates to the technical field of non-woven fabric production detection equipment, the online continuous detection device sequentially comprises a pressure applying module, a deformation detection module and a ventilation detection module, the pressure applying module is used for applying pressure to the upper surface of the non-woven fabric at intervals from top to bottom; the deformation detection module comprises a developing belt, a detection rod and an amplification detection assembly, the developing belt comprises a flat spreading part, the flat spreading part is flatly spread and always attached to the upper surface of the non-woven fabric, developing particles are supported on the flat spreading part, and when the developing belt synchronously runs along with the non-woven fabric, the developing particles always move on the flat spreading part; the detection rod is correspondingly, vertically and slidably connected below the spreading part, the top of the detection rod is used for keeping contact with the lower surface of the non-woven fabric, and the amplification assembly is used for performing amplification detection on the vertical displacement of the detection rod; the air permeability detection module is used for detecting the air permeability of the deformed area of the non-woven fabric. The non-woven fabric elasticity detection device has the effect of improving non-woven fabric elasticity detection efficiency.

Description

Technical Field

[0001] This application relates to the technical field of non-woven fabric production and detection, and particularly to an on-line continuous detection device and detection method for spunlace non-woven fabric. Background Art

[0002] Flushable spunlace non-woven fabric is a non-woven fabric that strengthens the fiber web through water flow. It is mainly manufactured by the spunlace technology. Compared with traditional methods such as hot pressing and needling, the fibers in the spunlace non-woven fabric are more naturally wound together through hydraulic action, and can maintain a high degree of softness. The structure of the flushable spunlace non-woven fabric is soft and has a hydrolysis function, that is, it can be flushed away by water under certain conditions, which is convenient for treatment and degradation; at the same time, the spunlace non-woven fabric usually also has good mechanical strength and is suitable for some application occasions that require a certain amount of stretching or deformation, such as filter materials, wiping cloths, masks, etc.

[0003] The raw materials of spunlace non-woven fabric usually use synthetic fibers such as polypropylene (PP), polyester (PET), nylon (PA), or natural fibers such as bamboo fibers and cotton fibers. Subsequently, the physical connection between the fibers is strengthened through processes such as fiber laying and spunlace reinforcement, thereby forming a strong fiber network. The non-woven fabric after spunlace reinforcement needs to be dried to remove residual moisture, and various tests need to be carried out on the finished non-woven fabric subsequently, including the detection of the elasticity of the non-woven fabric. The usual detection method is to apply a force perpendicular to the surface of the non-woven fabric to make the non-woven fabric straighten and deform in the direction of the applied force, and the elasticity of the non-woven fabric is detected by a detection instrument during this process.

[0004] However, the above detection method is suitable for measuring the elasticity of non-woven fabric in a static state, and cannot be detected when the non-woven fabric is continuously transported. Moreover, the above detection method cannot perform real-time monitoring on the rebound state of the subsequent non-woven fabric, resulting in defective detection results and affecting the final quality of the non-woven fabric. Summary of the Invention

[0005] In order to improve the situation that the existing detection device cannot perform continuous elasticity detection on non-woven fabric and cannot perform real-time monitoring on the rebound state of the non-woven fabric, which affects the final quality of the non-woven fabric, this application provides an on-line continuous detection device and detection method for spunlace non-woven fabric.

[0006] On the one hand, this application provides an on-line continuous detection device for spunlace non-woven fabric, adopting the following technical solution: An on-line continuous detection device for spunlace non-woven fabric successively includes A pressure application module for applying pressure to the upper surface of the non-woven fabric at intervals from top to bottom; 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 be flattened and always attached to the upper surface of the non-woven fabric, and the flattening portion supports a pile of visible particles. When the visible belt runs synchronously with the non-woven fabric, the visible particles always keep moving on the flattening portion. The detection rod is correspondingly connected to the bottom of the flattening portion in a vertical sliding manner. The top of the detection rod is used to keep in 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; The air permeability detection module is used to detect the air permeability of the area where the non-woven fabric is deformed.

[0007] Optionally, along the conveying direction of the non-woven fabric, the developing belt is sequentially provided with an unwinding shaft, a lifting shaft and a winding shaft, the unwinding shaft and the winding shaft are respectively used for unwinding and winding the developing belt, the lifting shaft is rotatably connected to the bottom of the developing belt, the vertical height of the lifting shaft is greater than 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.

[0008] Optionally, 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 along both sides of the developing belt to prevent the developing particles from falling from both sides of the developing belt.

[0009] 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 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 two corresponding limit bars are provided with laser position sensors for detecting the position of the rotating rod between the limit bars.

[0010] Optionally, a mounting wedge is provided at the top of the detection rod, which 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. The top of the contact roller protrudes from the mounting wedge, and the contact roller rises until the top surface is close to the lower surface of the non-woven fabric.

[0011] 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.

[0012] Optionally, it further includes supporting sheets which are correspondingly and spacedly arranged at two ends of the visible tape along the non-woven fabric transportation direction. The supporting sheets are horizontally placed and are used to be closely attached to the lower surface of the non-woven fabric to flatten the non-woven fabric.

[0013] Optionally, the air permeability detection module includes a blowing pipe and a detector. The blowing pipe and the detector are distributed on the upper and lower sides of the non-woven fabric respectively. The blowing pipe is used to connect to an external air source to blow air upward at the position where the non-woven fabric deforms, and the detector is correspondingly located above the blowing pipe and is used to detect the air permeability of the deformed area of the non-woven fabric.

[0014] On the other hand, the present application provides an on-line continuous detection method for spunlace non-woven fabric. The elastic detection of the non-woven fabric is carried out by using the on-line continuous detection device for spunlace non-woven fabric as described above, and it includes the following steps: S1: First, start the transportation of the non-woven fabric. The pressing module applies a fixed pressure from top to bottom to the non-woven fabric every preset interval time to detect the elasticity of the non-woven fabric. S2: The visible particles on the visible tape protrude downward to the deformed area of the non-woven fabric by their own gravity. The downward protruding area of the non-woven fabric pushes the detection rod to move 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 detects the air permeability of the area where the non-woven fabric has deformed to determine whether the final air permeability of the deformed area of the non-woven fabric is qualified. S4: The final elastic detection result of the non-woven fabric refers to the deformation amount and air permeability at the same time. When both the deformation amount and the air permeability are qualified, the elastic detection result of the non-woven fabric is qualified; when the deformation amount is qualified but the air permeability is unqualified, it is determined that the non-woven fabric was unqualified before the elastic detection; when the deformation amount does not exceed 10% of the preset value but the air permeability is qualified, the non-woven fabric can continue to be used; when both the deformation amount and the air permeability are unqualified, it is determined that the elastic detection result of the non-woven fabric is unqualified.

[0015] In summary, the present application includes at least one of the following beneficial effects: 1. By setting a visible belt that runs synchronously with the non-woven fabric, and having a pile of visible particles supported on the visible belt, the pile of visible particles has a certain gravity of its own and good fluidity. Therefore, the pile of visible particles on the visible belt has the ability to change its own stacking shape according to the shape of an external object. When the flat part of the visible belt is laid flat on the surface of the non-woven fabric, the visible particles on the visible belt will fall downward by their own gravity, causing the soft visible belt to be pressed downward by the gravity of the visible particles, so that the visible belt closely adheres to the surface of the non-woven fabric. At this time, the visible particles can flow according to the deformation of the surface of the non-woven fabric, thereby changing the shape and position of their own stacking, enabling the visible belt to completely fit the deformed area that appears on the surface of the non-woven fabric. After the non-woven fabric is pressed down by the pressing module, if the finished product quality of the non-woven fabric is qualified, the pressed area of the non-woven fabric will rebound to the initial state, or there will be 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 downward by the gravity of the visible particles on the visible belt and protrude downward more obviously. The actively downward protruding deformed area of the non-woven fabric can be detected more obviously by the detection rod, so that it is convenient to judge whether the deformation amount of the non-woven fabric is qualified by the displacement amount of the downward movement of the detection rod. During this detection process, the non-woven fabric does not need to stop for detection, so that the elasticity of the non-woven fabric can be continuously detected online, greatly improving the detection efficiency; 2. Since the displacement amount of the downward movement of the detection rod may be small and not easy to measure when detecting the deformation amount of the non-woven fabric, the displacement amount can be amplified by a rotating rod hinged to 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 shaft. After the rotating rod rotates, the end of the rotating rod between the two limiting strips moves upward. Since the horizontal distance between the fixed shaft and the detection rod is less than the horizontal distance between the fixed shaft and the limiting strips, according to the principle of similar triangles, the displacement amount of one end of the rotating rod descending with the detection rod can be amplified into the displacement amount of the other end of the rotating rod between the two limiting strips. At this time, the amplified displacement amount is more easily detected by the laser position sensor. The detection rod amplifies its own displacement amount generated due to the deformation of the non-woven fabric through the amplification detection component, which is more conducive to detection; 3. After the non-woven fabric has been tested for the amount of deformation, the air permeability of the deformed area also needs to be tested. By comprehensively considering the amount of deformation and air permeability, it is determined whether the final elastic test result of the non-woven fabric is qualified. When both the amount of deformation and air permeability are qualified, the elastic test result of the non-woven fabric is qualified; when the amount of deformation is qualified but the air permeability is unqualified, it is determined that the non-woven fabric was unqualified before the elastic test. At this time, it is necessary to uniformly re-test the quality of the non-woven fabric of the same batch to determine whether other indicators of the non-woven fabric are qualified; when the amount of 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 amount of 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 amount of deformation of the non-woven fabric does not exceed the preset value by 10%, the non-woven fabric can continue to be used, thus reducing the waste of non-woven fabric; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram showing the overall on-line continuous detection device in Embodiment 1 of the present application; Figure 2 is a schematic structural diagram showing a part of the on-line continuous detection device in Embodiment 1 of the present application; Figure 3 is a partial cross-sectional view showing the visible band and the detection rod in Embodiment 1 of the present application; Figure 4 is Figure 3 a cross-sectional view taken along A-A; Figure 5 is a partial cross-sectional view showing the magnifying component in Embodiment 1 of the present application; Figure 6 is a partial cross-sectional view showing the air permeability detection module in Embodiment 1 of the present application; Figure 7 is a schematic structural diagram showing a part of the on-line continuous detection device in Embodiment 2 of the present application; Figure 8 is a schematic structural diagram showing the display pen and the display paper in Embodiment 2 of the present application.

[0017] Description of the reference numerals: 1, non-woven fabric; 2, pressing module; 21, pressing rod; 22, pressure gauge; 23, driving member; 24, flattening roller; 3, deformation detection module; 31, visible band; 311, flat portion; 312, unwinding reel; 313, lifting shaft; 314, winding reel; 315, leak-proof baffle; 32, detection rod; 321, mounting wedge; 322, contact roller; 33, magnifying detection assembly; 331, limiting 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, blowing pipe; 42, detector; 5, fixed cylinder; 51, restoring member; 6, supporting piece. Detailed implementation mode

[0018] The following will further elaborate on this application in conjunction with the attached Figures 1-8 drawings for a more detailed description. Embodiment 1

[0019] Embodiment 1 of this application discloses an on-line continuous detection device for spunlace non-woven fabrics. Referring to Figure 1 and Figure 2 , the on-line continuous detection device sequentially includes a pressing module 2, a deformation detection module 3, and a breathability detection module 4 along the conveying direction of the non-woven fabric 1, which are used to sequentially perform pressing elasticity detection, deformation amount detection, and breathability detection on the finished product of the non-woven fabric 1, so as to comprehensively determine the quality of the non-woven fabric 1.

[0020] Specifically, the pressing module 2 includes a vertical pressing rod 21, a pressure gauge 22, and a driving member 23. The driving member 23 can be a small hydraulic cylinder or an electric cylinder. The output shaft of the driving member 23 is vertically downward and fixedly connected to the pressure gauge 22, and the pressing rod 21 is fixedly connected to the bottom of the pressure gauge 22. The top of the driving member 23 is fixed on the fixing 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 pressing rod 21. The flattening rollers 24 are grouped in pairs, and the same group of flattening rollers 24 are vertically corresponding and distributed on the upper and lower sides of the non-woven fabric 1 to flatten the non-woven fabric 1 located below the pressing rod 21, so as to facilitate the pressing rod 21 to press the non-woven fabric 1.

[0021] The position of the pressing rod 21 is correspondingly placed at the midline position of the non-woven fabric 1. The output shaft of the driving member 23 presses a vertically downward pressure on the pressing rod 21 at intervals through the pressure gauge 22, so that the pressing rod 21 presses a downward pressure on the upper surface of the non-woven fabric 1 vertically downward. The pressure applied downward 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 detection. At this time, the non-woven fabric 1 is pressed downward and deformed. Since the driving member 23 presses the non-woven fabric 1 at intervals of a fixed time, when the pressing rod 21 retracts, the non-woven fabric 1 with qualified elasticity will rebound to the initial state. If there are defects in the elasticity of some areas of the non-woven fabric 1, obvious deformation will still exist after rebound, but it is obviously difficult to distinguish this deformation by the naked eye.

[0022] To facilitate the detection of possible deformation of the non-woven fabric 1 after elasticity detection, referring to Figures 2 to 4, a deformation detection module 3 is provided behind the pressure application module 2. The deformation detection module 3 includes a visible band 31, a detection rod 32, and an amplification detection component 33. The visible band 31 can be made of a material with certain elasticity and good ductility, and the strength of the material making up the visible band 31 is less than that of the non-woven fabric 1, that is, the visible band 31 is more likely to deform under an externally applied force than the non-woven fabric 1. Therefore, the visible band 31 can be made of materials such as textiles (such as nylon, polyester fabric), TPU (thermoplastic polyurethane), elastic fabric (such as Lycra, spandex), flocked paper, or elastic composite paper.

[0023] The visible band 31 includes a flat portion 311. The flat portion 311 is located above the non-woven fabric 1 and always adheres to the upper surface of the non-woven fabric, so that the visible band 31 can always remain flat in the area of the flat portion 311. The upper surface of the flat portion 311 supports a pile of visible particles 34. The visible particles 34 can be fine sand with relatively large particles, or other smooth particles with a volume similar to that of fine sand. The visible particles 34 are piled up on the upper surface of the visible band 31, and the upper surface of the visible band 31 is relatively smooth, so that the visible particles 34 can slide on the upper surface of the visible band 31, thereby continuously changing their piled-up state. The visible band 31 can rotate synchronously with the non-woven fabric 1, and the visible particles 34 always move on the upper surface of the flat portion 311. Since the visible band 31 itself has certain elasticity and good ductility, after the visible particles 34 are piled up 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 closely adhere 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 appearing on the surface of the non-woven fabric 1, so that the visible band 31 can adaptively adhere to the deformed part of the non-woven fabric 1 under the action of the gravity of the visible particles 34 and return to the flat state after leaving, thereby realizing that the flat portion 311 closely adheres to the surface of the non-woven fabric 1.

[0024] The detection rod 32 is vertically slidably connected to the lower side of the visible band 31 and is also located below the non-woven fabric 1. Along the conveying direction of the non-woven fabric 1, a feeding reel 312, a lifting reel 313, and a winding reel 314 are sequentially arranged on the visible band. All three reels are rotatably connected to the fixed frames on both sides, and the rotation axes are perpendicular to the conveying direction of the non-woven fabric 1. The feeding reel 312 and the winding reel 314 respectively unwind and wind the visible band 31, and both the feeding reel 312 and the winding reel 314 can be driven to rotate by independent motors. The lifting reel 313 is rotatably connected between the feeding reel 312 and the winding reel 314 and is located below the visible band 31 at the same time. The vertical height of the lifting reel 313 is greater than that of the feeding reel 312 and the winding reel 314, and the feeding reel 312 is arranged close to the surface of the non-woven fabric 1, and the flat portion 311 is located between the feeding reel 312 and the lifting reel 313.

[0025] The visible particles 34 are accumulated on the upper surface of the flat part 311. When the entire visible belt 31 is synchronously operated with the non-woven fabric, the visible particles 34 on the flat part 311 will also move with the traction of the visible belt 31. Since the vertical height of the lifting shaft 313 is higher than the unwinding shaft 312, the visible particles 34 close to the lifting shaft 313 will also be lifted. The visible particles 34 are smooth and have a certain gravity. Therefore, the lifted visible particles 34 will gradually fall to the lower unwinding shaft 312 under the action of their own gravity. As the visible belt continues to operate, the lifted visible particles 34 will continue to fall, rise, and fall again on the flat part 311, and this cycle continues. The flat part 311 is always close to the surface of the non-woven fabric 1 under the gravity of the visible particles 34.

[0026] 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 bent upward, and the upwardly tilted edges of the visible belt 31 can effectively prevent the visible particles 34 thereon from falling. At the same time, the visible belt 31 is provided with leak-proof baffles 315 at the positions on both sides of the tilting, and the leak-proof baffles 315 are correspondingly placed on both sides of the visible belt 31 through the fixing frames on both sides. The leak-proof baffles 315 are provided with placement grooves near the bottom of the visible belt 31, and the two sides of the visible belt 31 slide in the placement grooves of the two leak-proof baffles 315, respectively, so that the operation of the visible belt 31 remains stable.

[0027] Further, see Figure 3 and Figure 5 The top of the detection rod 32 is fixedly connected with a mounting wedge 321, which is a triangle with an upward tip in cross section, and 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 small, and the length of the contact roller 322 is smaller than the diameter of the pressure rod 21, and in the initial state, the top surface of the contact roller 322 does not contact the bottom 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 and contacts the bottom surface of the non-woven fabric 1 under the drive of the detection rod 32, so that the top surface of the contact roller 322 can be close to the bottom surface of the non-woven fabric 1. The mounting wedge 321 covers the entire width direction of the nonwoven 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 nonwoven fabric 1 .

[0028] A fixed cylinder 5 is coaxially sleeved outside the detection rod 32. The fixed cylinder 5 is arranged on the fixed frames on both sides through connecting rods. The detection rod 32 is vertically and slidably connected inside the fixed cylinder 5, and the bottom of the detection rod 32 penetrates outside the fixed cylinder 5. A restoring member 51 is arranged inside the fixed cylinder 5. The restoring member 51 can be a compression spring. The restoring member 51 is vertically arranged. One end of the restoring member 51 is fixed to the side wall of the detection rod 32, and the other end of the restoring member 51 is fixed to the bottom wall of the fixed cylinder 5. The restoring member 51 can keep the contact roller 322 in contact with the lower surface of the non-woven fabric 1 all the time in the detection state. In Embodiment 1 of the present application, the fixed cylinder 5 is vertically and slidably connected to the fixed frames on both sides through connecting rods. Vertical slide rails can be arranged inside the fixed frames. The corresponding connecting rods of the fixed cylinder 5 are vertically and slidably connected to the fixed frames through the slide rails, and a driving electric cylinder can be arranged inside the fixed frames to drive the connecting rods together with the fixed cylinder 5 to move up and down. In the initial state, the fixed cylinder 5 is driven by the driving electric cylinder to descend a small height, so that the detection rod 32 together with the contact roller 322 at the top descends, so that there is a small distance between the top of the contact roller 322 and the lower surface of the non-woven fabric 1. Only when the pressing rod 21 presses the non-woven fabric 1, the contact roller 322 will be 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. And the length dimension of the contact roller 322 is smaller than the diameter dimension of the pressing 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, so as to smoothly push the detection rod 32 to descend.

[0029] Further, the magnification detection assembly 33 includes a limiting strip 331, a rotating rod 332 and a fixed shaft 333. There are two vertical limiting strips 331. The bottom of the limiting strip 331 is fixed on the workbench or the ground. The two limiting strips 331 are correspondingly and parallelly arranged at intervals. One end of the rotating rod 332 is hinged to the bottom end of the detection rod 32. The other end of the rotating rod 332 is slidably connected between the two corresponding limiting strips 331. The fixed shaft 333 horizontally penetrates 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 less than the horizontal distance between the fixed shaft 333 and the limiting strip 331, and the axis of the fixed shaft 333 extends along the width direction of the non-woven fabric.

[0030] To monitor the position of one end of the detection rotating rod 332 between the limiting strips 331 in real time, laser position sensors 334 are fixed on the inner side walls of two corresponding limiting strips 331. When the rotating rod 332 rotates, one end of the rotating rod 332 slides up and down between the two limiting strips 331. In the initial state, the rotating rod 332 is in a horizontal state. When the detection rod 32 descends, the rotating rod 332 rotates around the fixed shaft 333, causing the rotating rod 332 to gradually change to an upward-tilting state, and one end of the rotating rod 332 between the limiting strips 331 gradually moves upward. During the upward movement of the rotating rod 332, 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 externally connected to a control unit to transmit the detected position information of the rotating rod 332 to the control unit. Therefore, by increasing the number of laser position sensors 334 or adjusting the specific positions of the laser position sensors 334, the descent alarm trigger threshold of the detection rod 32 can be set. 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 device.

[0031] The developing tape 31 on which developing particles 34 are piled up itself has the ability to deform according to the shape of external objects. Since the developing particles 34 themselves have good fluidity, when the developing tape 31 is laid flat on the surface of the non-woven fabric 1, the developing particles 34 on the developing tape 31 will fall by their own gravity, causing the soft developing tape 31 to be pressed downward by the gravity of the developing particles 34, so that the developing tape 31 closely adheres to the upper surface of the non-woven fabric 1. At this time, the developing tape 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 pressing module 2, if the finished product quality of the non-woven fabric 1 is qualified, the pressed area of the non-woven fabric 1 will rebound to the initial state or have a smaller concave deformation compared to the initial state. At this time, when the area with a smaller deformation amount on the non-woven fabric 1 passes under the developing tape 31, the deformed area will be pressed downward by the gravity of the developing particles 34 on the developing tape 31 and protrude downward. The fact that the deformed area of the non-woven fabric 1 actively protrudes downward can be detected more obviously by the detection rod 32, so that it is convenient to judge whether the deformation amount of the non-woven fabric 1 is qualified by the displacement amount of the downward movement of the detection rod 32. During this detection process, the non-woven fabric 1 does not need to stop for detection, so that the elasticity of the non-woven fabric 1 can be continuously detected online, greatly improving the detection efficiency.

[0032] When detecting the deformation of the non-woven fabric 1, the displacement of the detection rod 32 moving downward may be small and not easy to measure. Therefore, the displacement can be amplified by the rotating rod 332 hinged to the lower end of the detection rod 32. Since the horizontal distance between the fixed shaft 333 and the detection rod 32 is less than the horizontal distance between the fixed shaft 333 and the limiting strip 331, according to the principle of similar triangles, the displacement of one end of the rotating rod 332 descending with the detection rod 32 can be amplified into the displacement of the other end of the rotating rod 332 between the two limiting strips 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 amplification detection component 33, which is more conducive to detection. Specifically, the 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 the actual situation, so that the detection of the deformation of the non-woven fabric 1 can be measured more accurately.

[0033] Referring to Figure 6 , the air permeability detection module 4 includes a blowing pipe 41 and a detector 42. The blowing pipe 41 and the detector 42 are distributed on the upper and lower sides of the non-woven fabric. The blowing pipe 41 can be externally connected to a wind source such as an air pump, and the air outlet faces upward to blow air upward at the deformed position of the non-woven fabric 1. The detector 42 can be an air permeability detector 42 and is correspondingly located above the blowing pipe 41 and the non-woven fabric 1 to detect the air permeability at the deformed part of the non-woven fabric 1. Specifically, the model and type of the detector 42 can refer to the conventional detectors 42 on the market, as long as it has the function of air permeability detection.

[0034] After the non-woven fabric 1 is detected for the deformation amount, the air permeability of the deformed area also needs to be detected. Through the comprehensive consideration of the deformation amount and the air permeability, the final elastic detection result of the non-woven fabric 1 is determined whether it is qualified. When both the deformation amount and the air permeability are qualified, the elastic detection 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 was unqualified before the elastic detection. At this time, the quality of the same batch of non-woven fabrics 1 needs to be re-detected uniformly to determine whether other indicators of the non-woven fabric 1 are qualified; 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. At this time, although the deformation amount 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 amount of the non-woven fabric 1 does not exceed the preset value by 10%, the non-woven fabric 1 can continue to be used, so that the waste of the non-woven fabric 1 can be reduced.

[0035] In the production of non-woven fabrics, image recognition technology is usually used to determine the quality of non-woven fabrics. However, there are some difficult-to-solve defects in the actual use of image recognition technology, such as limited recognition ability for complex scenes, sensitivity to angles and postures, data deviation problems, large resource consumption, and real-time problems. Therefore, in actual use, image recognition devices still have problems such as unstable output, incorrect output, and output delay, which are not conducive to the real-time monitoring of non-woven fabrics. Moreover, compared with the on-line continuous detection device disclosed in Embodiment 1 of the present application, the image recognition device also consumes a large amount of purchase cost, which is not conducive to enterprises saving costs.

[0036] The implementation principle of an on-line continuous detection device for non-woven fabrics in Embodiment 1 of the present application is as follows: When the visible tape 31 is laid flat on the surface of the non-woven fabric 1, the visible particles 34 on the visible tape 31 will fall by their own gravity, so that the soft visible tape 31 will be pressed downward by the gravity of the visible particles 34, so that the visible tape 31 is closely attached to the upper surface of the non-woven fabric 1. The deformed area of the non-woven fabric 1 is actively protruded downward by the visible tape 31 and can be more clearly detected by the detection rod 32. Through the amplification of the amplification detection component 33, the small displacement of the detection rod 32 is amplified into a large displacement at one end of the rotating rod 332, so as to be conveniently detected by the laser position sensor 334. Finally, combining the two indicators of the amount of deformation and air permeability, comprehensively determine whether the elastic detection of the non-woven fabric 1 is qualified. Embodiment 2

[0037] The difference between Embodiment 2 and Embodiment 1 is as follows: Referring to Figure 7 and Figure 8 The non-woven fabric 1 is divided into two regions along its own center line, and the driving member 23 is horizontally slidably connected to the fixing frame and can be driven by an electric cylinder, so that the pressing rod 21 can press these two regions respectively to detect elasticity. Correspondingly, the detection rod 32 and the amplification detection component 33 are also provided in two groups, which are respectively arranged below the two regions of the non-woven fabric 1 Furthermore, the amplification detection component further includes two groups of display pens and display paper 336, wherein the display pens 335 are coaxially fixed to the bottoms of the two detection rods 32 one by one, and the display paper 336 is laid flat below the display pens 335. When there is a large deformation in any region of the non-woven fabric 1, the display pen 335 below the corresponding region will draw a mark on the display paper 336 under the drive of the detection rod 32, so that it is possible to visually judge which region does not meet the requirement of the amount of deformation. Embodiment 3

[0038] Embodiment 3 of the present application discloses an on-line continuous detection method for non-woven fabrics, which uses the on-line continuous detection device for non-woven fabrics described in Embodiment 1 or Embodiment 2 to perform elastic detection on non-woven fabrics, including the following steps: S1: First, start the transportation of the non-woven fabric 1. The driving member 23 applies a fixed pressure from top to bottom to the non-woven fabric 1 through the pressing rod 21 at a preset interval to detect the elasticity of the non-woven fabric 1. S2: The visible band 31 uses the gravity of the visible particles 34 thereon to highlight the deformed area of the non-woven fabric 1 downward. The downward protruding area of the non-woven fabric 1 pushes the detection rod 32 to move downward. The downward displacement of the detection rod 32 is amplified and detected by the amplification detection assembly 33 to determine whether the final deformation amount of the deformed area of the non-woven fabric 1 is qualified. S3: The air permeability detection module 4 detects the air permeability of 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. S4: The final elasticity detection result of the non-woven fabric 1 refers to the deformation amount and air permeability at the same time. When both the deformation amount and air permeability are qualified, the elasticity detection 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 was unqualified before the elasticity detection; when the deformation amount does not exceed 10% of the preset value but the air permeability is qualified, the non-woven fabric 1 can continue to be used; when both the deformation amount and air permeability are unqualified, it is determined that the elasticity detection result of the non-woven fabric 1 is unqualified.

[0039] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An online continuous detection device for spunlace nonwoven fabrics, characterized in that: 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 be flattened and always attached to the upper surface of the non-woven fabric, and the flattening portion supports a pile of visible particles. When the visible belt runs synchronously with the non-woven fabric, the visible particles always keep moving on the flattening portion. The detection rod is correspondingly connected to the bottom of the flattening portion in a vertical sliding manner. The top of the detection rod is used to keep in 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; The air permeability detection module is used to detect the air permeability of the area where the non-woven fabric is deformed.

2. The online continuous detection device for spunlace nonwoven fabric according to claim 1, characterized in that: Along the conveying direction of the non-woven fabric, the developing belt is sequentially provided with an unwinding shaft, a lifting shaft and a winding shaft, the unwinding shaft and the winding shaft are respectively used for unwinding and winding the developing belt, the lifting shaft is rotatably connected to the bottom of the developing belt, the vertical height of the lifting shaft is greater than 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 fabric 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 fabric according to claim 1, characterized in that: The amplification detection component includes a limit bar, a rotating rod and a fixed shaft. The limit bars are provided with multiple vertical ones, and every two limit bars are arranged correspondingly and 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 two corresponding limit bars. The fixed shaft is horizontally penetrated 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 two corresponding limit bars are provided with laser position sensors for detecting the position of the rotating rod between the limit bars.

5. The online continuous detection device for spunlace nonwoven fabric according to claim 4, characterized in that: A mounting wedge is provided at the top of the detection rod. 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. The top of the contact roller protrudes from the mounting wedge. During detection, the contact roller rises until the top surface is close to the lower surface of the non-woven fabric.

6. The online continuous detection device for spunlace nonwoven fabric according to claim 5, characterized in that: 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 arranged 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.

7. The online continuous detection device for spunlace nonwoven fabric 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.

8. The online continuous detection device for spunlace nonwoven fabric 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 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 non-woven fabric at the deformed position.

9. An online continuous detection method for spunlace nonwoven fabrics, characterized in that: Using the online continuous detection device for spunlace nonwoven fabrics according to any one of claims 1 to 8 to detect the elasticity of the nonwoven fabrics, the method comprises the following steps: S1: First, the non-woven fabric is transported, and 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, and the area of ​​the non-woven fabric that is highlighted downward pushes the detection rod to move 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 air permeability detection on the area where the non-woven fabric has been deformed to determine whether the final air permeability of the area where the non-woven fabric has been deformed is qualified; S4: The final elasticity test result of the non-woven fabric 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 is qualified; when the deformation amount is qualified but the air permeability is unqualified, the non-woven fabric is judged to be unqualified 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 can continue to be used; when both the deformation amount and the air permeability are unqualified, the elasticity test result of the non-woven fabric is judged to be unqualified.

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