A nonwoven fabric processing-based defect visual inspection device and method

Abstract

The application relates to the technical field of defect detection, and specifically discloses a defect visual detection device based on non-woven fabric processing, which comprises a machine body, conveying rollers for conveying non-woven fabric are arranged on the two sides of the machine body, a camera for visual detection is fixedly connected in the machine body, the defect visual detection device further comprises a conveying assembly arranged on the right part of the machine body, the conveying assembly is used for intermittently conveying the non-woven fabric, the camera shoots images for visual detection when conveying is paused, through cooperation of the above structure, the non-woven fabric can be kept in a stationary state during shooting, the non-woven fabric will not be shot when the non-woven fabric shakes, so that motion blur of the images collected by the camera is avoided, the accuracy of visual detection is affected, and when traction is stopped, the conveying roller on the left side slightly releases the non-woven fabric, so that the deformation of the non-woven fabric caused by tension is reduced during stationary shooting, and the detection accuracy is further improved.

Description

Technical Field

[0001] This invention relates to the field of defect detection technology, and in particular to a visual defect detection device and method based on nonwoven fabric processing. Background Technology

[0002] Two-component spunbond composite nonwoven fabric is a new type of material formed by combining two polymers with different properties in a specific ratio through a spunbonding process. Common two-component spunbond composite nonwoven fabrics are composed of PE / PP. In the production of nonwoven fabrics, they are often used in the surface layer of high-end diapers, medical protective clothing, masks, etc. In order to ensure product quality, defect visual inspection of nonwoven fabrics is required during production. The image sensor is the "eye" of the entire visual inspection system and is the most core and indispensable hardware component. The inspection is completed by "lens + image sensor". The lens is responsible for optical imaging, while the image sensor is responsible for converting the optical image into electronic signals.

[0003] For example, the "Visual Inspection Device for Nonwoven Fabric Production" with publication number "CN212904579U" uses a lighting tube to illuminate the fabric surface during the fabric conveying process of the nonwoven fabric through the fabric conveying unit. The reflector can reflect the light, making the contrast between black defects and white on the nonwoven fabric surface more obvious. The camera can clearly collect the image information of the black defects, so as to analyze and identify the black defects in the information processing system.

[0004] During the conveying process of nonwoven fabric, the vibration caused by the mechanical movement of the conveying part can easily cause the nonwoven fabric to shake. The shaking of the nonwoven fabric can easily cause motion blur in the image captured by the camera, affecting the accuracy of visual inspection. Furthermore, since the PE / PP combined bicomponent spunbond composite nonwoven fabric is elastic, it will be affected by the conveying tension during the conveying of the nonwoven fabric, causing the nonwoven fabric detection position to deform, which in turn affects the detection accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a defect visual inspection device and method based on nonwoven fabric processing, which can keep the nonwoven fabric in a static state during shooting, and avoid shooting the nonwoven fabric when it is shaking, thereby avoiding motion blur in the image captured by the camera, which would affect the accuracy of visual inspection. Furthermore, when traction stops, the conveyor roller on the left side will slightly unwind, thereby reducing the deformation of the nonwoven fabric caused by tension during static shooting, further improving the accuracy of inspection, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a defect visual inspection device based on nonwoven fabric processing, comprising a machine body, conveying rollers for conveying nonwoven fabric rotating on both sides of the machine body, and a camera for visual inspection fixedly connected inside the machine body; the defect visual inspection device further includes: The conveying assembly is located on the right side of the machine body. The conveying assembly is used to intermittently convey nonwoven fabric. When the conveying is paused, the camera captures images for visual inspection. The conveying assembly includes a servo electric cylinder fixed on the top right side of the machine body. The output shaft of the servo electric cylinder is fixedly connected to a first rack. The conveying assembly also includes a ratchet fixedly rotating at the rear end of the right conveying roller. A first gear is fixed on the outside of the ratchet. The outside of the first gear meshes with the first rack. The conveying assembly also includes a groove opened at the rear end of the right conveying roller. A round rod is fixed inside the groove. A pawl is rotatably connected to the outside of the round rod. A torsion spring is fixedly connected between the pawl and the round rod.

[0007] Preferably, a rubber block is fixedly connected inside the machine body near the conveyor roller on the right side.

[0008] Preferably, the machine body is internally equipped with a smoothing component for smoothing the nonwoven fabric. The smoothing component includes an internal horizontal plate fixedly connected to the machine body. Motion rods are slidably connected between the rear ends of the horizontal plate and the rear inner wall of the machine body. Connecting frames are slidably connected to the sides of the multiple motion rods near the middle of the machine body. Smoothing frames are fixedly connected between the connecting frames on the same side. Smoothing blocks are slidably connected to the bottom of the smoothing frames. Smoothing shafts are rotatably connected to the bottom of the smoothing blocks. Drive components for driving the motion rods are configured inside the horizontal plate and at the rear of the machine body.

[0009] Preferably, the drive assembly inside the horizontal plate includes a motor fixedly connected to the inner side of the horizontal plate, the output shaft of the motor is fixedly connected to a bidirectional lead screw, and the outer walls on both sides of the bidirectional lead screw are threadedly connected to the moving rod. The drive assembly inside the horizontal plate has the same structure as the drive assembly at the rear of the machine body.

[0010] Preferably, the top of the smoothing block is threadedly connected to a threaded rod, the top of the threaded rod is rotatably connected to the smoothing frame, the outer wall of the threaded rod is fixedly connected to a second gear, the inside of the smoothing frame is slidably connected to a second rack, the outer side of the second gear meshes with the second rack, the inner sides of the machine body are fixedly connected to a blocking frame, and the threaded rod is threadedly connected to the smoothing block.

[0011] Preferably, an anti-slip pad is fixedly connected to the bottom of the second rack, and the second racks on both sides are staggered relative to each other.

[0012] Preferably, the end of the smoothing shaft is provided with a limiting component, which includes a slide rod slidably connected to the end of the smoothing block, an inclined block fixedly connected to the side of the slide rod outside the smoothing block, a magnetic block fixedly connected to the side of the slide rod away from the inclined block, an adsorption block fixedly connected to the inner wall of the smoothing block near the inclined block, a spring fixedly connected between the moving rod and the connecting frame, and a pressing frame fixedly connected to the outer wall of the moving rod.

[0013] Preferably, the bottom of the smoothing block is provided with a shaking component, which includes a lifting frame slidably connected to the inner side of the smoothing block, a first U-shaped spring sheet fixedly connected between the lifting frame and the smoothing block, a knocking rod rotatably connected to the outside of the lifting frame, a pressure plate fixedly connected to the outer wall of the lifting frame, the top of the pressure plate being inclined, and an extrusion plate fixedly connected to the end of the smoothing shaft in a ring array.

[0014] Preferably, the internal structure of the machine body is equipped with a dust collection component, which includes an adsorption hole at the bottom of the smoothing frame and a curved frame fixed to the top of the moving rod at the rear end. A corrugated bladder is fixedly connected between the two curved frames at the rear end. An air suction pipe is fixedly inserted between the corrugated bladder and the connecting frame at the rear end. An exhaust pipe is fixedly inserted on the side of the corrugated bladder away from the air suction pipe. A dust collection frame is detachably connected to the outer wall of the curved frame on the left side. The exhaust pipe extends into the interior of the dust collection frame. A filter plate is fixedly connected to the outer side of the dust collection frame. Check valves are installed inside both the exhaust pipe and the air suction pipe.

[0015] A visual inspection method for defects in nonwoven fabric processing includes the following steps: S1. Conveying: conveying nonwoven fabric through conveying components; S2. Inspection: The non-woven fabric is inspected by taking pictures with a camera. Compared with the prior art, the beneficial effects of the present invention are: 1. By utilizing the conveying component, the non-woven fabric can remain stationary during shooting, preventing it from being photographed while shaking, thus avoiding motion blur in the images captured by the camera and affecting the accuracy of visual inspection. 2. When traction stops, the conveyor roller on the left will slightly unwind, thereby reducing the deformation of the nonwoven fabric caused by tension when shooting at rest, and further improving the accuracy of detection; 3. The connecting frame moves the smoothing frame to both sides, which causes the smoothing block to move with the smoothing shaft to both sides. During this process, the smoothing shafts at the top and bottom cooperate to smooth the non-woven fabric. This design avoids uneven wrinkles on the non-woven fabric that could affect the accuracy of the test. 4. The relative movement between the moving rod and the connecting frame allows relative movement between the pressing frame and the tilting block. At this time, the pressing frame presses the tilting block, causing the tilting block to move towards the smoothing shaft along with the sliding rod and the magnetic block. Meanwhile, the magnetic block presses the end of the smoothing block to prevent the smoothing shaft from rotating after smoothing, ensuring a good limiting effect after smoothing and guaranteeing the smoothing effect, further reducing the impact of wrinkles on detection accuracy. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an overall structural view of the present invention; Figure 2 This is a cross-sectional view of the top of the body of the present invention; Figure 3 This is a partial structural schematic diagram of the smoothing component of the present invention; Figure 4 This is a rear view schematic diagram of the smoothing frame of the present invention; Figure 5 This is a partial side cross-sectional view of the body of the present invention; Figure 6 This is an enlarged view of point A in section 5 of the present invention; Figure 7 This is a schematic diagram of the partially exploded structure of the ratchet of the present invention; Figure 8 This is an enlarged view of section B of the present invention; Figure 9 This is a side cross-sectional view of the smoothing block of the present invention; Figure 10 This is a partial structural schematic diagram of the jitter component of the present invention; Figure 11 This is a half-sectional structural diagram of the smoothing shaft of the present invention; Figure 12 This is a partial structural schematic diagram of the spring of the present invention; Figure 13 This is a partial structural diagram of the dust collection component of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Machine body; 2. Conveyor roller; 3. Conveyor assembly; 31. Servo electric cylinder; 32. First rack; 33. Ratchet; 34. First gear; 35. Torsion spring; 36. Round rod; 37. Claw; 38. Rubber block; 39. Groove; 4. Smoothing assembly; 41. Horizontal plate; 42. Moving rod; 43. Connecting frame; 44. Smoothing frame; 45. Smoothing shaft; 46. Smoothing block; 47. Threaded rod; 48. Second gear; 49. Second rack; 410. Blocking frame; 411. Anti-slip pad; 5. Drive assembly 51. Motor; 52. Bidirectional lead screw; 6. Limiting assembly; 61. Slide bar; 62. Inclined block; 63. Magnetic block; 64. Adsorption block; 65. Spring; 66. Extrusion frame; 7. Vibration assembly; 71. Lifting frame; 72. First U-shaped spring; 73. Knocking rod; 74. Extrusion plate; 75. Pressure plate; 8. Dust collection assembly; 81. Adsorption hole; 82. Bending frame; 83. Check valve; 84. Bellows; 85. Suction pipe; 86. Exhaust pipe; 87. Dust collection frame; 88. Filter plate; 9. Camera. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figures 1 to 12 This invention provides a technical solution: a defect visual inspection device based on nonwoven fabric processing, comprising a body 1, with conveyor rollers 2 rotating on both sides of the body 1 for conveying nonwoven fabric, and a camera 9 for visual inspection fixedly connected inside the body 1. The defect visual inspection device also includes a conveyor assembly 3 disposed on the right side of the body 1. Two cameras 9 for visual inspection are disposed at both ends of the nonwoven fabric inspection area, respectively, and can inspect both sides of the nonwoven fabric. During inspection, the cameras 9 capture images, and an externally set image sensor converts the optical images into electronic signals for accurate visual inspection. The middle part of the conveyor roller 2 on the left is used to install the nonwoven fabric roll, and the end of the nonwoven fabric is fixedly wound around the middle part of the conveyor roller 2 on the right.

[0021] The conveying assembly 3 is used for intermittent conveying of nonwoven fabric. When the conveying is paused, the camera 9 captures images for visual inspection. The conveying assembly 3 includes a servo electric cylinder 31 fixed on the top right side of the machine body 1. The output shaft of the servo electric cylinder 31 is fixedly connected to a first rack 32. The conveying assembly 3 also includes a ratchet 33 fixedly rotating at the rear end of the right conveying roller 2. A first gear 34 is fixed on the outside of the ratchet 33. The outside of the first gear 34 meshes with the first rack 32. The conveying assembly 3 also includes a groove 39 opened at the rear end of the right conveying roller 2. A round rod 36 is fixed inside the groove 39. A pawl 37 is rotatably connected to the outside of the round rod 36. A torsion spring 35 is fixedly connected between the pawl 37 and the round rod 36. A rubber block 38 is fixedly connected inside the machine body 1 near the right conveying roller 2.

[0022] By adopting the above technical solution, during the testing process, the output shaft of the servo electric cylinder 31 reciprocates, causing the first rack 32 to move up and down. When the first rack 32 moves downward, the first gear 34 causes the ratchet 33 to rotate clockwise. At this time, the non-tilted inner side of the ratchet 33 presses against the pawl 37, causing the pawl 37 to rotate the right-side conveyor roller 2. The rotation of the right-side conveyor roller 2 pulls the nonwoven fabric to continuously test the nonwoven fabric.

[0023] When the first rack 32 moves upward, the first gear 34 causes the ratchet 33 to rotate counterclockwise. At this time, the inclined inner side of the ratchet 33 presses against the pawl 37, causing the pawl 37 to overcome the torque provided by the torsion spring 35 and deflect at an angle inside the groove 39. At this time, the ratchet 33 will not rotate the conveyor roller 2 on the right side, so that the nonwoven fabric will not be pulled. The nonwoven fabric remains stationary, so that the nonwoven fabric will not be photographed when it shakes, thus avoiding motion blur in the image captured by the camera and affecting the accuracy of visual inspection.

[0024] The rubber block 38 allows for greater friction between the right-side conveyor roller 2 and the machine body 1, resulting in friction greater than the elastic force of the torsion spring 35. In contrast, the friction between the left-side conveyor roller 2 and the machine body 1 is smaller. When the PE / PP nonwoven fabric is pulled, it undergoes slight elastic deformation. When the pulling stops, the left-side conveyor roller 2 will slightly unwind, thereby reducing the deformation of the nonwoven fabric caused by tension during static shooting and further improving the accuracy of the detection.

[0025] The machine body 1 is internally equipped with a smoothing component 4 for smoothing non-woven fabric. The smoothing component 4 includes a horizontal plate 41 fixedly connected to the inside of the machine body 1. Motion rods 42 are slidably connected between the rear ends of the horizontal plate 41 and the rear inner walls of the machine body 1. Connecting frames 43 are slidably connected to the side of the multiple motion rods 42 near the middle of the machine body 1. Smoothing frames 44 are fixedly connected between the connecting frames 43 on the same side. Smoothing blocks 46 are slidably connected to the bottom of the smoothing frames 44. Smoothing shafts 4 are rotatably connected to the bottom of the smoothing blocks 46. 5. Both the interior of the horizontal plate 41 and the rear of the machine body 1 are equipped with drive components 5 for driving the movement of the moving rod 42. The drive component 5 inside the horizontal plate 41 includes a motor 51 fixedly connected to the inner side of the horizontal plate 41. The output shaft of the motor 51 is fixedly connected to a bidirectional lead screw 52. The outer walls on both sides of the bidirectional lead screw 52 are threadedly connected to the moving rod 42. The drive component 5 inside the horizontal plate 41 has the same structure as the drive component 5 at the rear of the machine body 1. During the smoothing stage, both the upper and lower smoothing shafts 45 are in contact with the nonwoven fabric.

[0026] By adopting the above technical solution, when the output shaft of the servo electric cylinder 31 moves upward, the external controller controls the output shaft of the motor 51 to rotate, thereby causing the bidirectional lead screw 52 to rotate, causing the moving rods 42 on both sides to move away from each other. During this process, the connecting frame 43 moves the smoothing frame 44 to both sides, thereby causing the smoothing block 46 to move the smoothing shaft 45 to both sides. During this process, the smoothing shafts 45 at the top and bottom cooperate to smooth the non-woven fabric. This design avoids uneven wrinkles in the non-woven fabric that could affect the accuracy of the detection.

[0027] It should be noted that the 45° rotation design of the smoothing shaft avoids excessive stretching of the non-woven fabric during smoothing.

[0028] It should be noted that the fabric needs to be smoothed out before taking pictures through camera 9. This design helps to reduce the possibility of wrinkles in the non-woven fabric interfering with the visual inspection results, thereby further improving the accuracy of the inspection.

[0029] After the shooting is completed, the output shaft of the motor 51 drives the bidirectional lead screw 52 to rotate in the opposite direction to the previous direction. At this time, the moving rods 42 on both sides move towards each other, causing the connecting frame 43 to move the smoothing frame 44 towards the middle, and causing the smoothing block 46 to move the smoothing shaft 45 towards the middle to reset.

[0030] It should be noted that motor 51 is a permanent magnet synchronous motor, which can rotate synchronously by being driven by a shared frequency converter.

[0031] The top of the smoothing block 46 is threadedly connected to a threaded rod 47. The top of the threaded rod 47 is rotatably connected to the smoothing frame 44. A second gear 48 is fixedly connected to the outer wall of the threaded rod 47. A second rack 49 is slidably connected inside the smoothing frame 44. The outer side of the second gear 48 meshes with the second rack 49. A blocking frame 410 is fixedly connected to both sides of the inside of the body 1. An anti-slip pad 411 is fixedly connected to the bottom of the second rack 49. The second racks 49 on both sides are staggered relative to each other. The staggered arrangement ensures that the second racks 49 on both sides do not interfere with each other. The threaded rod 47 is threadedly connected to the smoothing block 46.

[0032] By adopting the above technical solution, when the smoothing block 46 moves and resets to the center with the smoothing shaft 45, the second rack 49 on the smoothing block 46 is limited by the smoothing frame 44 on the other side and moves relative to the smoothing frame 44, thereby causing relative movement between the second rack 49 and the second gear 48. Under the action of meshing with the second rack 49 on the outside of the second gear 48, the second gear 48 can rotate with the threaded rod 47. Under the action of the threaded rod 47 and the smoothing block 46 being threadedly connected, the smoothing block 46 moves with the smoothing shaft 45 towards the non-woven fabric, which facilitates the smoothing shaft 45 to adhere to the non-woven fabric. When the smoothing shaft 45 moves in both directions to smooth the fabric, it adheres to the non-woven fabric to ensure the smoothing effect.

[0033] During the smoothing process, as the smoothing frame 44 moves to both sides, when the side of the smoothing frame 44 is in contact with the blocking frame 410, the second rack 49 is limited by the blocking frame 410, causing the second rack 49 to move relative to the smoothing frame 44. This causes the second gear 48 to rotate in the opposite direction to the previous rotation, and the smoothing frame 44 lifts the smoothing shaft 45. This ensures that during the process of the smoothing frame 44 moving back to the center with the smoothing shaft 45 to reset, the smoothing shaft 45 does not contact the non-woven fabric, thus avoiding excessive traction on the non-woven fabric.

[0034] It should be noted that the design of the anti-slip pad 411 results in a large frictional force between the second rack 49 and the smoothing frame 44.

[0035] After the smoothing shaft 45 and smoothing block 46 move to the center to reset, the output shaft of the servo electric cylinder 31 extends again.

[0036] The end of the smoothing shaft 45 is equipped with a limiting component 6. The limiting component 6 includes a slide rod 61 slidably connected to the end of the smoothing block 46. An inclined block 62 is fixedly connected to the side of the slide rod 61 outside the smoothing block 46. A magnetic block 63 is fixedly connected to the side of the slide rod 61 away from the inclined block 62. An adsorption block 64 is fixedly connected to the inner wall of the smoothing block 46 near the inclined block 62. The adsorption block 64 is made of iron. A spring 65 is fixedly connected between the moving rod 42 and the connecting frame 43. A pressing frame 66 is fixedly connected to the outer wall of the moving rod 42.

[0037] By adopting the above technical solution, when smoothing, under the action of the magnetic block 63 and the adsorption block 64, the magnetic block 63 sticks tightly to the adsorption block 64, and at this time the friction between the smoothing block 46 and the smoothing shaft 45 is small.

[0038] When the smoothing frame 44 moves to both sides and its side surfaces come into contact with the blocking frame 410, the output shaft of the motor 51 continues to move the bidirectional lead screw 52 slightly. At this time, relative movement occurs between the moving rod 42 and the connecting frame 43, which in turn causes relative movement between the pressing frame 66 and the tilting block 62. The pressing frame 66 then presses the tilting block 62, causing the tilting block 62 to move towards the smoothing shaft 45 along with the sliding rod 61 and the magnetic block 63. At this time, the magnetic block 63 presses the end of the smoothing block 46 to prevent the smoothing shaft 45 from rotating after smoothing, ensuring a good limiting effect after smoothing and guaranteeing the smoothing effect. This further reduces the impact of wrinkles on detection accuracy.

[0039] Example 2: The technical solution of this example differs from that of Example 1 in that: Figures 1 to 4 and Figures 9 to 13 The machine body 1 is equipped with a dust collection component 8. The dust collection component 8 includes an adsorption hole 81 at the bottom of the smoothing frame 44. The dust collection component 8 also includes a curved frame 82 fixed to the top of the moving rod 42 at the rear end. A corrugated bag 84 is fixedly connected between the two curved frames 82 at the rear end. An air suction pipe 85 is fixedly inserted between the corrugated bag 84 and the connecting frame 43 at the rear end. An exhaust pipe 86 is fixedly inserted on the side of the corrugated bag 84 away from the air suction pipe 85. A dust collection frame 87 is detachably connected to the outer wall of the curved frame 82 on the left side. The dust collection frame 87 can be detachably connected by means including but not limited to snap-fit. The exhaust pipe 86 extends into the interior of the dust collection frame 87. A filter plate 88 is fixedly connected to the outer side of the dust collection frame 87. The surface of the filter plate 88 has filter holes. Check valves 83 are installed inside both the exhaust pipe 86 and the air suction pipe 85.

[0040] The check valve 83 is a mature existing technology, and its principle and installation method will not be described in detail. The check valve 83 inside the exhaust pipe 86 does not allow external air to enter the bellows 84 from the exhaust pipe 86, and the check valve 83 inside the intake pipe 85 does not allow air inside the bellows 84 to be discharged from the intake pipe 85.

[0041] It should be noted that the corrugated bladder 84 has a relatively large volume to ensure sufficient inhalation volume when smoothing out.

[0042] By adopting the above technical solution, during the smoothing process, relative movement occurs between the two curved frames 82, causing the corrugated bladder 84 to be stretched. At this time, negative pressure is generated inside the corrugated bladder 84, which then draws air through the suction pipe 85 and the suction hole 81 at the bottom of the smoothing frame 44 to absorb dust and impurities on the non-woven fabric, thus avoiding the impact of dust and impurities on the non-woven fabric on the accuracy of the test.

[0043] When the smoothing frame 44 moves back to the middle position, the two curved frames 82 move closer to each other, the bellows 84 is compressed, and gas and dust are discharged from the exhaust pipe 86. The dust collection frame 87 filters and collects dust, and air is discharged from the filter holes on the surface of the filter plate 88.

[0044] The bottom of the smoothing block 46 is equipped with a shaking component 7. The shaking component 7 includes a lifting frame 71 slidably connected to the inner side of the smoothing block 46. A first U-shaped spring piece 72 is fixedly connected between the lifting frame 71 and the smoothing block 46. A knocking rod 73 is rotatably connected to the outside of the lifting frame 71. A pressure plate 75 is fixedly connected to the outer wall of the lifting frame 71. The top of the pressure plate 75 is inclined. An extrusion plate 74 is fixedly connected to the end of the smoothing shaft 45 in a ring array. The end diameter of the smoothing shaft 45 is relatively small.

[0045] The interior of the blocking frame 410 is hollow and does not block the knocking rod 73. The elastic force of the first U-shaped spring 72 is set to be small, less than the friction between the smoothing shaft 45 and the non-woven fabric. The end of the extrusion plate 74 can rotate with a roller to reduce friction.

[0046] By adopting the above technical solution, during the smoothing process, the smoothing shaft 45 rotates continuously, causing the extrusion plate 74 to rotate. When the extrusion plate 74 rotates, it can press against the pressure plate 75. During this process, the pressure plate 75 moves downward with the lifting frame 71 and the knocking rod 73. When the extrusion plate 74 moves away from the pressure plate 75, under the elastic force of the first U-shaped spring 72, the extrusion plate 74 moves upward to reset. This design allows the lifting frame 71 to move up and down with the knocking rod 73, which facilitates the knocking of the non-woven fabric, facilitates the discharge of impurities inside, further improves the dust removal effect, and thus further improves the accuracy of the detection.

[0047] A visual inspection method for defects in nonwoven fabric processing includes the following steps: S1. Conveying: The middle part of the conveying roller 2 on the left is used to install the non-woven fabric roll. The end of the non-woven fabric is fixedly wrapped around the middle part of the conveying roller 2 on the right. The output shaft of the servo electric cylinder 31 reciprocates to extend and retract, which causes the first rack 32 to move up and down. When the first rack 32 moves downward, the first gear 34 causes the ratchet 33 to rotate clockwise. At this time, the non-tilted inner side of the ratchet 33 presses the pawl 37, causing the pawl 37 to rotate the conveying roller 2 on the right. The rotation of the conveying roller 2 on the right pulls the non-woven fabric to continuously detect the non-woven fabric. S2, Detection: When the transport is paused, camera 9 captures images for visual inspection.

[0048] Working principle: The nonwoven fabric remains stationary, thus preventing it from being photographed when it shakes, thereby avoiding motion blur in the image captured by the camera and affecting the accuracy of visual inspection. The rubber block 38 allows for greater friction between the right-side conveyor roller 2 and the machine body 1, exceeding the elastic force of the torsion spring 35. The friction between the left-side conveyor roller 2 and the machine body 1 is smaller. When the PE / PP nonwoven fabric is pulled, it undergoes slight elastic deformation. When pulling stops, the left-side conveyor roller 2 slightly unwinds, reducing the deformation of the nonwoven fabric caused by tension during stationary shooting and further improving the accuracy of inspection.

[0049] The output shaft of motor 51 rotates, causing the bidirectional lead screw 52 to rotate, which in turn causes the moving rods 42 on both sides to move away from each other. During this process, the connecting frame 43 moves the smoothing frame 44 to both sides, which in turn causes the smoothing block 46 to move the smoothing shaft 45 to both sides. During this process, the smoothing shafts 45 at the top and bottom cooperate to smooth the non-woven fabric. This design avoids uneven wrinkles in the non-woven fabric that could affect the accuracy of the test. When the smoothing block 46 moves back to the center with the smoothing shaft 45, the second rack 49 on the smoothing block 46 is limited by the smoothing frame 44 on the other side and moves relative to the smoothing frame 44. This causes relative movement between the second rack 49 and the second gear 48. Under the action of the second gear 48 meshing with the second rack 49, the second gear 48 can rotate the threaded rod 47. The threaded rod 47 and the smoothing block 46 move together. Under the action of the threaded connection, the smoothing block 46 moves with the smoothing shaft 45 towards the non-woven fabric, making it easier for the smoothing shaft 45 to adhere to the non-woven fabric. This smoothing shaft 45 moves in both directions to smooth and adhere to the non-woven fabric, ensuring the smoothing effect. When the smoothing frame 44 moves to both sides and the side of the smoothing frame 44 adheres to the blocking frame 410, the output shaft of the motor 51 continues to move the bidirectional lead screw 52 slightly. At this time, the moving rod 42 and the connecting frame 43 generate relative movement, which can generate relative movement between the extrusion frame 66 and the tilting block 62. At this time, the extrusion frame 66 extrudes the tilting block 62, causing the tilting block 62 to move with the sliding rod 61 and the magnetic block 63 towards the smoothing shaft 45. At this time, the magnetic block 63 extrudes the end of the smoothing block 46 to prevent the smoothing shaft 45 from rotating after smoothing, ensuring a good limiting effect after smoothing, ensuring the smoothing effect, and further reducing the impact of wrinkles on detection accuracy.

[0050] During the smoothing process, relative movement occurs between the two curved frames 82, causing the corrugated bladder 84 to be stretched. At this time, negative pressure is generated inside the corrugated bladder 84, which draws air through the suction pipe 85 and the suction hole 81 at the bottom of the smoothing frame 44 to absorb dust and impurities on the non-woven fabric, thus preventing dust and impurities on the non-woven fabric from affecting the accuracy of the test.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defect visual inspection device based on nonwoven fabric processing, comprising a body (1), conveying rollers (2) for conveying nonwoven fabric rotating on both sides of the body (1), and a camera (9) for visual inspection fixedly connected inside the body (1), characterized in that, The defect visual inspection device also includes: The conveying assembly (3) is located on the right side of the machine body (1). The conveying assembly (3) is used for intermittent conveying of nonwoven fabric. When the conveying is paused, the camera (9) captures images for visual inspection. The conveying assembly (3) includes a servo electric cylinder (31) fixed on the top right side of the machine body (1). The output shaft of the servo electric cylinder (31) is fixedly connected to a first rack (32). The conveying assembly (3) also includes a ratchet (33) fixedly rotating at the rear end of the right conveying roller (2). The outer side of the ratchet (33) is fixed. There is a first gear (34), the outer side of the first gear (34) meshes with the first rack (32), the conveying assembly (3) also includes a groove (39) opened at the rear end of the right conveying roller (2), a round rod (36) is fixed inside the groove (39), a pawl (37) is rotatably connected to the outside of the round rod (36), a torsion spring (35) is fixedly connected between the pawl (37) and the round rod (36), and a rubber block (38) is fixedly connected inside the body (1) near the right conveying roller (2); The machine body (1) is internally equipped with a smoothing component (4) for smoothing non-woven fabric. The smoothing component (4) includes an internal horizontal plate (41) fixedly connected to the machine body (1). Motion rods (42) are slidably connected between the rear ends of the horizontal plate (41) and the rear inner walls of the machine body (1). Connecting frames (43) are slidably connected to the side of the multiple motion rods (42) near the middle of the machine body (1). Smoothing frames (44) are fixedly connected between the connecting frames (43) on the same side. Smoothing blocks (46) are slidably connected to the bottom of the smoothing frames (44). Smoothing shafts (45) are rotatably connected to the bottom of the smoothing blocks (46). The interior of the horizontal plate (41) and the rear of the body (1) are equipped with drive components (5) for driving the movement of the motion rod (42). The top of the smoothing block (46) is threadedly connected to a threaded rod (47). The top of the threaded rod (47) is rotatably connected to the smoothing frame (44). The outer wall of the threaded rod (47) is fixedly connected to a second gear (48). The interior of the smoothing frame (44) is slidably connected to a second rack (49). The outer side of the second gear (48) meshes with the second rack (49). The interior sides of the body (1) are fixedly connected to a blocking frame (410). The threaded rod (47) is threadedly connected to the smoothing block (46). The end of the smoothing shaft (45) is provided with a limiting component (6). The limiting component (6) includes a slide rod (61) slidably connected to the end of the smoothing block (46). An inclined block (62) is fixedly connected to the side of the slide rod (61) outside the smoothing block (46). A magnetic block (63) is fixedly connected to the side of the slide rod (61) away from the inclined block (62). An adsorption block (64) is fixedly connected to the inner wall of the smoothing block (46) near the inclined block (62). A spring (65) is fixedly connected between the moving rod (42) and the connecting frame (43). A pressing frame (66) is fixedly connected to the outer wall of the moving rod (42). The body (1) is equipped with a dust collection component (8). The dust collection component (8) includes an adsorption hole (81) at the bottom of the smoothing frame (44). The dust collection component (8) also includes a curved frame (82) fixed at the top of the moving rod (42) at the rear end. A corrugated bag (84) is fixedly connected between the two curved frames (82) at the rear end. An air suction pipe (85) is fixedly inserted between the corrugated bag (84) and the connecting frame (43) at the rear end. An exhaust pipe (86) is fixedly inserted on the side of the corrugated bag (84) away from the air suction pipe (85). A dust collection frame (87) is detachably connected to the outer wall of the curved frame (82) on the left side. The exhaust pipe (86) extends into the interior of the dust collection frame (87). A filter plate (88) is fixedly connected to the outside of the dust collection frame (87). Check valves (83) are installed inside the exhaust pipe (86) and the air suction pipe (85).

2. The defect visual inspection device based on nonwoven fabric processing according to claim 1, characterized in that: The drive assembly (5) inside the horizontal plate (41) includes a motor (51) fixedly connected to the inside of the horizontal plate (41). The output shaft of the motor (51) is fixedly connected to a two-way lead screw (52). The outer walls on both sides of the two-way lead screw (52) are threadedly connected to the moving rod (42). The drive assembly (5) inside the horizontal plate (41) has the same structure as the drive assembly (5) at the rear of the body (1).

3. The defect visual inspection device based on nonwoven fabric processing according to claim 2, characterized in that: The bottom of the second rack (49) is fixedly connected to an anti-slip pad (411), and the second racks (49) on both sides are staggered relative to each other.

4. The defect visual inspection device based on nonwoven fabric processing according to claim 3, characterized in that: The bottom of the smoothing block (46) is equipped with a shaking component (7). The shaking component (7) includes a lifting frame (71) slidably connected to the inside of the smoothing block (46). A first U-shaped spring (72) is fixedly connected between the lifting frame (71) and the smoothing block (46). A knocking rod (73) is rotatably connected to the outside of the lifting frame (71). A pressure plate (75) is fixedly connected to the outer wall of the lifting frame (71). The top of the pressure plate (75) is inclined. An extrusion plate (74) is fixedly connected to the end of the smoothing shaft (45) in a ring array.

5. A visual inspection method for defects in nonwoven fabric processing, characterized in that: This method is applicable to the visual inspection device for defects in nonwoven fabric processing as described in any one of claims 1-4, and includes the following steps: S1, conveying, conveying the nonwoven fabric through the conveying assembly (3); S2, Inspection: The non-woven fabric is inspected by taking pictures using a camera (9).

Images