Non-woven fabric surface defect detection marking method and detection system thereof

Abstract

The invention discloses a non-woven fabric surface defect detecting and marking method which comprises the following steps: (1) mounting to-be-detected reel cloth on an unwinding frame, conveying the cloth rightwards along a guide roller on a rack and winding the cloth into a winding roller of a winding frame on the right side of the rack; (2) a winding motor of the winding frame runs, and winding of the cloth is achieved; (3) a middle detection supporting frame is arranged between the rack and the winding frame, a second industrial camera and an industrial camera are installed on the middle detection supporting frame, and the second industrial camera and the industrial camera detect the top face and the bottom face of the cloth; under the condition that the cloth runs at a normal speed, non-stop detection and marking can be carried out, the effect is good, and the efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric testing equipment technology, and more specifically to a method and system for detecting and marking defects on the surface of nonwoven fabrics. Background Technology

[0002] After processing, existing nonwoven fabrics need to be visually inspected. During the processing, the surface of existing nonwoven fabrics may have defects such as black spots, stains, impurities, insects, yellow spots, and hair. The existing method is to manually visually inspect the fabric to find problems. However, because the fabric is transported very quickly, manual visual inspection may not be able to keep up with the frequency of the fabric transport, which can easily lead to missed detections. Therefore, many existing systems use industrial cameras to achieve automatic visual inspection, which greatly improves efficiency and effectiveness. However, existing visual inspection equipment still needs to mark defects during operation, which means that the fabric conveying inspection speed cannot be too fast. At the same time, it is necessary to stop the operation when marking is required, and then continue the operation after marking. This results in low efficiency and poor effectiveness. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for detecting and marking defects on the surface of nonwoven fabrics. This method and system can perform non-stop detection and marking while the fabric is running at normal speed, and it has good effect and high efficiency.

[0004] The solution of the present invention to the aforementioned technical problem is: A method for detecting and marking defects on the surface of nonwoven fabric includes the following steps: (1) Install the roll of fabric to be tested onto the unwinding frame. The fabric is fed to the right along the guide rollers on the frame and wound into the winding rollers of the winding frame on the right side of the frame. (2) The winding motor of the winding frame runs to realize the winding of the fabric; (3) An intermediate inspection support frame is provided between the frame and the winding frame. A second industrial camera and an industrial camera are installed on the intermediate inspection support frame. The second industrial camera and the industrial camera inspect the top and bottom surfaces of the fabric. (4) The test results are transmitted to the control host through the signal line. After receiving the test signal and processing it through the corresponding processing software, the control host transmits the corresponding control signal to the marking device on the right side of the intermediate test support frame through the signal line. The marking device moves the marking head to the position where it needs to be marked. (5) The previously inspected fabric is transported to the area below the marking head and marked by the marking head descending.

[0005] The unwinding frame includes two side support frames. The two ends of the middle connecting shaft of the unwinding roller extend out of the two ends of the unwinding roller and are installed on the two side support frames. The middle connecting shaft is movably connected to the unwinding roller through bearings. The upper, middle and lower parts of the right side of the two side support frames are respectively provided with a first guide roller, a second guide roller and a third guide roller, and the two ends of the first guide roller, the second guide roller and the third guide roller are movably connected to the two side support frames through bearings.

[0006] The lower part of the right side wall of the two side support frames of the unwinding frame is fixed with a left horizontal fixing plate, and the right side of the left horizontal fixing plate is fixed to the lower left side wall of the front and rear side support frames of the machine frame.

[0007] The upper part of the two side support plates of the frame is fixed with an upper transverse beam extending horizontally to the right. The bottom surface of the right end of the upper transverse beam is fixed with a vertical column extending downward. The lower left side wall of the two vertical columns is fixed with a second horizontal fixing plate. The left side wall of the second horizontal fixing plate is fixed to the lower right side wall of the two side support plates of the frame. A fourth guide roller is provided on the lower left side between the two side support plates, a fifth guide roller is provided on the middle left side between the two side support plates, a sixth guide roller and a ninth guide roller are provided on the upper left and right sides between the two side support plates respectively, a seventh guide roller is provided between the two side support plates below the sixth guide roller, an eighth guide roller is provided between the two side support plates below the ninth guide roller, a tenth guide roller is provided between the right ends of the two upper transverse beams, and an eleventh guide roller is provided at the two vertical columns.

[0008] The intermediate detection support frame includes a bottom base. The top surface of the top plate of the bottom base is fixed with side fixing plates at the front and rear. The inner side wall of the middle of the two side fixing plates is fixed with a first connecting beam extending horizontally to the right. An upper lighting device is installed between the two first connecting beams. The upper right side wall of the two side fixing plates is fixed with the same front-to-back extending fixing beam. The middle of the top surface of the fixing beam is fixed with a first electric cylinder. The bottom end of the push rod of the first electric cylinder extends out of the bottom surface of the fixing beam and is fixed with an upper lifting plate. The bottom surface of the upper lifting plate is fixed with multiple industrial cameras arranged in a front-to-back pattern. The camera of the industrial camera illuminates and detects the top surface of the fabric being conveyed below.

[0009] The inner sidewalls of the two side fixing plates are each fixed with a second connecting beam extending horizontally to the left. A lower lighting device is installed between the two second connecting beams. The lower left sidewalls of the two side fixing plates are fixed with the same second fixing beam extending forward and backward. A second electric cylinder is fixed in the middle of the bottom surface of the second fixing beam. The top of the push rod of the second electric cylinder extends out of the top surface of the second fixing beam and is fixed with a lower lifting plate. Multiple second industrial cameras arranged in a front-back pattern are fixed on the top surface of the lower lifting plate. The cameras of the second industrial cameras illuminate and detect the bottom surface of the fabric being conveyed below.

[0010] The right side extension fixing plate is fixed on the right side wall of the front and rear side fixing plates of the intermediate detection support frame. The marking device includes a central vertical fixed plate fixed to the top surface of the two side-extending fixed plates, a front-to-back extending moving mechanism fixed to the two vertical fixed plates, a connecting plate fixed to the right side wall of the moving block of the moving mechanism, a lifting cylinder fixed to the center of the top surface of the connecting plate, the bottom end of the push rod of the lifting cylinder extending out of the bottom surface of the connecting plate and fixed to a marking fixed plate, a marking head fixed to the marking fixed plate, and the bottom of the marking head extending out of the bottom surface of the marking fixed plate.

[0011] The outstanding effects of this invention are: 1. It can perform non-stop detection and marking while ensuring the fabric runs at normal speed, with good results and high efficiency.

[0012] It can simultaneously inspect the top and bottom surfaces of fabric, with excellent inspection results; 3. It has a lower illumination device and an upper illumination device, which can improve the illumination detection of industrial cameras and second industrial cameras, and improve the detection effect.

[0013] Its left horizontal fixing plate and second horizontal fixing plate allow operators to stand, enabling manual inspection of the top and bottom surfaces of the fabric to meet different inspection needs. Attached Figure Description

[0014] Figure 1 This is a simplified structural diagram of the present invention; Figure 2 yes Figure 1 A magnified view of a portion of the image; Figure 3 yes Figure 1 A magnified view of another part; Figure 4 This is a partial structural schematic diagram of the first electric cylinder of the present invention; Figure 5 This is a partial cross-sectional view of the lower lighting device of the present invention; Figure 6 This is a partial structural diagram of the moving mechanism of the present invention. Detailed Implementation

[0015] For example, see below. Figures 1 to 6 As shown, a method for detecting and marking defects on the surface of nonwoven fabric includes the following steps: (1) The roll of fabric to be tested is installed on the unwinding frame 100. The fabric is fed to the right along all the guide rollers on the frame (which are the subsequent first guide roller 1 to eleventh guide roller 11 and all right guide rollers) and wound into the winding roller of the winding frame 20 on the right side of the frame. (2) The winding motor of the winding frame 20 runs to realize the winding of the fabric; (3) An intermediate detection support frame 30 is provided between the frame and the winding frame 20. A second industrial camera 394 and an industrial camera 363 are installed on the intermediate detection support frame 30. The second industrial camera 31 and the industrial camera 32 detect the top and bottom surfaces of the fabric. (4) The test results are transmitted to the control host through the signal line. After receiving the test signal and processing it through the corresponding processing software, the control host transmits the corresponding control signal to the marking device 40 on the right side of the intermediate test support frame 30 through the signal line. The marking device 40 moves the marking head 41 to the position where it needs to be marked. (5) The previously tested fabric that needs to be marked is transported to the area below the marking head. The marking head 41 descends and marks the fabric until it is completely rolled up in the winding frame 20. After the fabric is removed from the winding frame 20, it can be packaged. This is very convenient.

[0016] Furthermore, the unwinding frame 10 includes two side support frames fixed on the ground, and the two ends of the middle connecting shaft of the unwinding roller extend out of the two ends of the unwinding roller and are installed on the two side support frames. The middle connecting shaft is movably connected to the unwinding roller through bearings. The upper, middle and lower parts of the right side of the two side support frames are respectively provided with a first guide roller 1, a second guide roller 2 and a third guide roller 3. The two ends of the first guide roller 1, the second guide roller 2 and the third guide roller 3 are movably connected to the two side support frames through bearings.

[0017] The lower part of the right side wall of the two side support frames of the unwinding frame 10 is fixed with a left horizontal fixing plate 200, and the right side of the left horizontal fixing plate 200 is fixed to the lower left side wall of the front and rear side support frames of the frame.

[0018] Furthermore, an upper transverse beam extending horizontally to the right is fixed to the upper part of the two side support plates of the frame, and a vertical column extending downward is fixed to the bottom surface of the right end of the upper transverse beam. A second horizontal fixing plate 300 is fixed to the lower left side wall of the two vertical columns, and the left side wall of the second horizontal fixing plate 300 is fixed to the lower right side wall of the two side support plates of the frame. In this embodiment, operators can stand on the top surfaces of both the left horizontal fixing plate 200 and the second horizontal fixing plate 300. The operator at the left horizontal fixing plate 200 can perform manual visual inspection of the top surface of the conveyed fabric, and the operator at the second horizontal fixing plate 300 can perform manual visual inspection of the bottom surface of the conveyed fabric.

[0019] A fourth guide roller 4 is provided on the lower left side between the two side support plates, a fifth guide roller 5 is provided on the middle left side between the two side support plates, a sixth guide roller 6 and a ninth guide roller 9 are provided on the upper left and right sides between the two side support plates respectively, a seventh guide roller 7 is provided between the two side support plates below the sixth guide roller 6, and an eighth guide roller 8 is provided between the two side support plates below the ninth guide roller 9. The two ends of all the above guide rollers are movably connected to the two side support plates through bearings. A tenth guide roller 10 is provided between the right ends of the two upper transverse beams, and an eleventh guide roller 11 is provided at the two vertical columns. The two ends of the tenth guide roller 10 are movably connected to the two upper transverse beams through bearings. Bearing seats are fixed on the right side wall of the middle part of the two vertical columns, and the two ends of the eleventh guide roller 11 are fixed on the inner rings of the bearings of the two bearing seats.

[0020] A first inclined support plate 12 is fixed between the two side support plates between the fifth guide roller 5 and the sixth guide roller 6, and a second inclined support plate 13 is fixed between the two side support plates between the ninth guide roller 9 and the eighth guide roller 8. The first inclined support plate 12 and the second inclined support plate 13 have an inner groove formed in the middle of one side of the fabric. A circuit board is fixed on the inner wall of the inner groove, and an LED lamp body is installed on it. A transparent plate is fixed at the outer end of the inner groove. The circuit board is electrically connected to an external control host (the control host is a conventional structure and will not be described in detail here) through an electrical connection line, and the corresponding LED lamp body is controlled to light up through the control host.

[0021] During use, the bottom surface of the fabric is conveyed against the transparent plate of the first inclined support plate 12, and the LED lights inside illuminate the plate, making it easy for a person to check whether the top surface of the conveyed fabric meets the requirements. Any non-compliant parts can be marked manually. The top surface of the fabric is conveyed against the transparent plate of the second inclined support plate 13, and the LED lights inside the plate illuminate the plate, making it easy for a person to check whether the bottom surface of the conveyed fabric meets the requirements. Any non-compliant parts can be marked manually.

[0022] The above structure is used during manual inspection.

[0023] Furthermore, the intermediate detection support frame 30 includes a bottom base 33 fixed to the ground. The top surface of the top plate of the bottom base 33 is fixed with side fixing plates 34 at both the front and rear. The inner sidewalls of the middle of the two side fixing plates 34 are fixed with first connecting beams 35 extending horizontally to the right. An upper lighting device 31 is installed at the right side between the two first connecting beams 35. The upper right sidewalls of the two side fixing plates 34 are fixed with the same front-to-back extending fixing beam 36. The middle of the top surface of the fixing beam 36 is fixed with a first electric cylinder 361. The bottom end of the push rod of the first electric cylinder 361 extends out of the bottom surface of the fixing beam 36 and is fixed with an upper lifting plate 36. The bottom surface of the upper lifting plate 362 is fixed with multiple industrial cameras 363 arranged in a front-to-back pattern. The cameras of the industrial cameras 363 illuminate and detect the top surface of the fabric being conveyed below. Slider blocks are fixed to the left side walls of the front and rear of the upper lifting plate 362, and vertical guide rails are fixed to the upper right side walls of the two side fixing plates 34. The sliders are inserted into and cooperate with the corresponding vertical guide rails. By pushing or retracting the push rod of the first electric cylinder 361, the height position of the industrial camera 363 can be adjusted to meet the needs of detection and adjustment.

[0024] The inner sidewalls of the two side fixing plates 34 are each fixed with a second connecting beam 37 extending horizontally to the left. A lower lighting device 38 is installed at the left end between the two second connecting beams 37. The lower left sidewalls of the two side fixing plates 34 are fixed with the same second fixing beam 39 extending forward and backward. A second electric cylinder 391 is fixed in the middle of the bottom surface of the second fixing beam 39. The top of the push rod of the second electric cylinder 391 extends out of the top surface of the second fixing beam 39 and is fixed with a lower lifting plate 392. Multiple second industrial cameras 394 arranged in a front-back pattern are fixed on the top surface of the lower lifting plate 392. The cameras of the second industrial cameras 394 illuminate and detect the bottom surface of the fabric being conveyed below. Vertical guide rails are fixed on the lower sidewalls of the two side fixing plates 34. Slider blocks fixed on the front and rear right sidewalls of the lower lifting plate 392 are inserted into and cooperate with the corresponding vertical guide rails. The height adjustment of the second industrial camera 394 can be achieved by pushing or retracting the push rod of the second electric cylinder 391 to meet the needs of detection and adjustment.

[0025] In the above structure, the upper lighting device 31 and the lower lighting device 38 have the same structure, both including an elongated tube. The middle of the front and rear end plates of the elongated tube is fixed with a rotating shaft. The rotating shaft is movably connected to the connecting plate fixed on the corresponding first connecting beam 35 or second connecting beam 37 through bearings. A motor base is fixed on the outer wall of the connecting plate. A servo motor is fixed on the outer end face of the motor base. The end of the output shaft of the servo motor extends out of the outer end plate of the motor base. One end of the rotating shaft extends out of the outer wall of the corresponding connecting plate and is connected to the output shaft of the servo motor through a coupling. The bottom plate of the elongated tube of the upper lighting device 31 has a through groove formed in the middle. A transparent plate covers the through groove and is fixed on the elongated tube. The top plate of the elongated tube of the lower lighting device 38 has a through groove formed in the middle. A transparent plate covers the through groove and is fixed on the elongated tube.

[0026] It operates via a corresponding servo motor, which can rotate the upper lighting device 31 or the lower lighting device 38 to change its illumination angle and meet the usage requirements.

[0027] Among them, a rotating shaft is movably connected to a connecting plate fixed on the side wall of the side fixing plate 34 on one side of the intermediate detection support frame 30 via a bearing. One end of the rotating shaft extends out of the connecting plate and is fixed with a detection wheel. The detection wheel rests on the fabric. A turntable is fixed to the outer end of the rotating shaft. A meter counter is fixed on the connecting plate. A sensing part is fixed to one side of the turntable. The sensing part corresponds to the sensing end of the proximity switch of the meter counter. It can drive the detection wheel to rotate through the fabric, thereby realizing the meter count. Through the correspondence between the meter count and time, its rotation speed can be calculated. Of course, other speed detection devices can also be installed on it, which will not be described in detail here.

[0028] The system needs to transmit the detection data to the control host, which can then obtain the operating speed.

[0029] Furthermore, the right side extension fixing plates extending to the right are fixed on the right side walls of the front and rear side fixing plates 34 of the intermediate detection support frame 30; multiple right guide rollers arranged from top to bottom are provided between the right ends of the two side extension fixing plates, and the front and rear ends of the right guide rollers are movably connected to the two side extension fixing plates through bearings. A winding roller is movably connected between the front and rear side plates of the winding frame 20, and a winding motor is fixed on the outer side wall of one of the side plates. The winding roller can be rotated by the winding motor to realize the winding of the fabric.

[0030] The marking device 40 includes a vertical fixing plate 42 fixed in the middle of the top surface of the two side-extending fixing plates, and a forward and backward extending moving mechanism 43 fixed on the two vertical fixing plates 42. The moving mechanism includes a front-to-back connecting plate fixed between the upper parts of two vertical fixed plates 42. A vertical fixed plate is fixed on the left side wall of the upper connecting plate. The two ends of the front-to-back extending moving screw are movably connected to the two vertical fixed plates 42 through bearings. A main moving servo motor is fixed on the outer side wall of one of the vertical fixed plates 42. The output shaft of the main moving servo motor is a spline shaft, which is inserted into the spline hole at one end of the moving screw to drive the moving screw to rotate. A moving block 431 is screwed onto the moving screw. A grating ruler reading head 49 is fixed on the left side wall of the moving block 431. A front-to-back extending grating ruler is fixed on the right side wall of the vertical fixed plate. The grating ruler reading head 49 is inserted into the grating ruler. The bottom surface of the upper connecting plate is fixed with an upper guide rail, and the top surface of the moving block 431 is fixed with an upper slider. The upper guide rail is inserted into a groove formed in the middle of the top surface of the upper slider and cooperates with the groove.

[0031] A connecting plate 432 is fixed on the right side wall of the moving block 431 of the moving mechanism 43. A lifting cylinder 433 is fixed in the middle of the top surface of the connecting plate 432 (which is connected to the control valve of the pneumatic system through a connecting pipe; it is a conventional structure and will not be described in detail here). The bottom end of the push rod of the lifting cylinder 433 extends out of the bottom surface of the connecting plate 432 and is fixed with a marking fixing plate 434. A marking head 41 is fixed on the marking fixing plate 434, and the bottom of the marking head 41 extends out of the bottom surface of the marking fixing plate 434.

[0032] A vertical guide rod is fixed to the top surface of the marking fixing plate 434, and the vertical guide rod is inserted into the vertical guide through hole formed on the connecting plate 432.

[0033] In this embodiment, the fabric is wound around the first guide roller 1 to the eleventh guide roller 11 and all the right guide rollers, as shown in the attached figure. It can be detected manually, as described above, or automatically.

[0034] The automatic detection involves the fabric being inspected by the cameras of all industrial cameras 363 and the second industrial camera 394. For locations with problems, the corresponding industrial camera 363 or the second industrial camera 394 sends a sensor signal to the control host. The control host then controls the main servo motor of the corresponding marking device 40 to operate, positioning the marking head 41 in the corresponding position. At this point, the fabric has not yet been conveyed. The control host calculates the speed value obtained from the meter counter. When the fabric to be marked is conveyed to below the marking head 41, the control host controls the control valve of the pneumatic system connected to the lifting cylinder 433 to operate, causing the push rod of the lifting cylinder 433 to push, causing the marking head 41 to mark the corresponding position on the fabric (e.g., the marking head 41 can be a marker pen, whose bottom end presses on the fabric, leaving a black dot as a mark; other methods can also be used). Since the sensing position of the industrial camera 363 or the second industrial camera 394 is a range, the marking position is also around the defective location, not directly on the defect itself; it is essentially a range.

[0035] In this embodiment, regardless of whether it is the detection position of the industrial camera 363 or the second industrial camera 394, that is, when there is a defect on the back of the fabric, it can be marked by the marking head 41 above. The ink can penetrate to the back and be seen.

[0036] In this embodiment, the defective location of the fabric is first detected by industrial camera 363 or second industrial camera 394, so that the marking head 41 can move into place before the fabric arrives. Then, when the fabric arrives, the mark can be lowered directly. It does not require stopping the fabric conveying. It can perform detection and marking without stopping the machine while ensuring uniform fabric conveying. It has good effect and high efficiency.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for detecting and marking defects on the surface of nonwoven fabrics, characterized in that: Includes the following steps: (1) The roll of fabric to be tested is installed on the unwinding frame (100). The fabric is fed to the right along all the guide rollers on the frame and wound into the winding roller of the winding frame (20) on the right side of the frame. (2) The winding motor of the winding frame (20) runs to realize the winding of the fabric; (3) An intermediate inspection support frame (30) is provided between the frame and the winding frame (20). A second industrial camera (394) and an industrial camera (363) are installed on the intermediate inspection support frame (30). The second industrial camera (31) and the industrial camera (32) inspect the top and bottom surfaces of the fabric. (4) The test results are transmitted to the control host through the signal line. After receiving the test signal and processing it through the corresponding processing software, the control host transmits the corresponding control signal to the marking device (40) on the right side of the intermediate test support frame (30) through the signal line. The marking device (40) moves the marking head (41) to the position to be marked. (5) The previously tested fabric that needs to be marked is transported to the area below the marking head, and the marking head (41) descends to mark it.

2. The nonwoven fabric surface defect detection marking method and detection system according to claim 1, characterized in that: The unwinding frame (10) includes two side support frames. The two ends of the middle connecting shaft of the unwinding roller extend out of the two ends of the unwinding roller and are installed on the two side support frames. The middle connecting shaft is movably connected in the unwinding roller through bearings. The upper, middle and lower parts of the right side of the two side support frames are respectively provided with a first guide roller (1), a second guide roller (2) and a third guide roller (3). The two ends of the first guide roller (1), the second guide roller (2) and the third guide roller (3) are movably connected to the two side support frames through bearings.

3. The nonwoven fabric surface defect detection marking method and detection system according to claim 1, characterized in that: The lower part of the right side wall of the two side support frames of the unwinding frame (10) is fixed with a left horizontal fixing plate (200), and the right side of the left horizontal fixing plate (200) is fixed on the lower left side wall of the front and rear side support frames of the frame.

4. The nonwoven fabric surface defect detection marking method and detection system according to claim 1, characterized in that: The upper part of the two side support plates of the frame is fixed with an upper transverse beam extending horizontally to the right. The bottom surface of the right end of the upper transverse beam is fixed with a vertical column extending downward. The lower left side wall of the two vertical columns is fixed with a second horizontal fixing plate (300). The left side wall of the second horizontal fixing plate (300) is fixed on the lower right side wall of the two side support plates of the frame. A fourth guide roller (4) is provided on the lower left side between the two side support plates, a fifth guide roller (5) is provided on the middle left side between the two side support plates, a sixth guide roller (6) and a ninth guide roller (9) are provided on the upper left and right sides between the two side support plates respectively, a seventh guide roller (7) is provided between the two side support plates below the sixth guide roller (6), an eighth guide roller (8) is provided between the two side support plates below the ninth guide roller (9), a tenth guide roller (10) is provided between the right ends of the two upper transverse beams, and an eleventh guide roller (11) is provided at the two vertical columns.

5. The nonwoven fabric surface defect detection marking method and detection system according to claim 1, characterized in that: The intermediate detection support frame (30) includes a bottom seat (33). The top surface of the top plate of the bottom seat (33) is fixed with side fixing plates (34) at the front and rear. The inner side wall of the middle part of the two side fixing plates (34) is fixed with a first connecting beam (35) extending horizontally to the right. An upper lighting device (31) is installed between the two first connecting beams (35). The upper right side wall of the two side fixing plates (34) is fixed with the same front-to-back extending fixing beam (36). The middle part of the top surface of the fixing beam (36) is fixed with a first electric cylinder (361). The bottom end of the push rod of the first electric cylinder (361) extends out of the bottom surface of the fixing beam (36) and is fixed with an upper lifting plate (362). The bottom surface of the upper lifting plate (362) is fixed with multiple industrial cameras (363) arranged in a front-to-back pattern. The camera of the industrial camera (363) illuminates and detects the top surface of the fabric conveyed below.

6. The nonwoven fabric surface defect detection marking method and detection system according to claim 5, characterized in that: The inner sidewalls of the two side fixing plates (34) are each fixed with a second connecting beam (37) extending horizontally to the left. A lower lighting device (38) is installed between the two second connecting beams (37). The left sidewalls of the lower part of the two side fixing plates (34) are fixed with the same second fixing beam (39) extending forward and backward. A second electric cylinder (391) is fixed in the middle of the bottom surface of the second fixing beam (39). The top of the push rod of the second electric cylinder (391) extends out of the top surface of the second fixing beam (39) and is fixed with a lower lifting plate (392). Multiple second industrial cameras (394) arranged in a front-back pattern are fixed on the top surface of the lower lifting plate (393). The camera of the second industrial camera (394) illuminates and detects the bottom surface of the fabric being conveyed below.

7. The nonwoven fabric surface defect detection marking method and detection system according to claim 1, characterized in that: The right side extension fixing plate is fixed on the right side wall of the front and rear side fixing plates (34) of the intermediate detection support frame (30); The marking device (40) includes a vertical fixing plate (42) fixed in the middle of the top surface of the two side-extending fixing plates. A moving mechanism (43) extending forward and backward is fixed on the two vertical fixing plates (42). A connecting plate (432) is fixed on the right side wall of the moving block (431) of the moving mechanism (43). A lifting cylinder (433) is fixed in the middle of the top surface of the connecting plate (432). The bottom end of the push rod of the lifting cylinder (433) extends out of the bottom surface of the connecting plate (432) and is fixed with a marking fixing plate (434). A marking head (41) is fixed on the marking fixing plate (434). The bottom of the marking head (41) extends out of the bottom surface of the marking fixing plate (434).

8. The nonwoven fabric surface defect detection marking method and detection system according to claim 7, characterized in that: A vertical guide rod is fixed on the top surface of the marking fixing plate (434), and the vertical guide rod is inserted into the vertical guide through hole formed on the connecting plate (432).

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