Defect detection device for PP film production

Abstract

The invention discloses a defect detection device for PP film production, which comprises a rack device, a detection device, a detection device and a control device, the rack device is provided with a carrier roller, and the rack device is provided with a driving belt for driving the carrier roller to rotate; the polygonal mirror is arranged on the outer side of the carrier roller in an arc shape; the machine frame device comprises two sets of first machine frames, two sets of synchronous assemblies are arranged on the outer sides of the first machine frames, the two sets of synchronous assemblies are symmetrically arranged relative to the carrier roller, and industrial cameras are arranged on the synchronous assemblies and used for shooting PP films reflected on the polygon mirror. The synchronous assembly further comprises a first gear, the first gear is fixedly connected with the end of the carrier roller, an intermittent assembly is arranged on the first rack, a base is fixedly connected to the first rack, a second gear is rotationally connected to the base, and a fixing assembly used for fixing an industrial camera is arranged on the second gear. And the reset assembly is arranged on the second gear.

Description

Technical Field

[0001] The invention relates to the technical field of film detection, in particular to a defect detection device for PP film production. Background Art

[0002] In the production process of PP film (polypropylene film), defect detection devices are essential to ensure product quality. Such devices usually use advanced optical and image processing technologies to automatically detect and classify various defects that may occur during the production process: Light source system: usually uses light sources such as LED and laser to provide uniform and stable light for irradiating the surface of PP film; Camera system: high-resolution camera or line scan camera to capture images of the surface of PP film.

[0003] Image processing unit: A high-speed processor or dedicated image processing chip that analyzes images captured by the camera system to identify and classify defects.

[0004] Control system: includes hardware controller and software interface, used to operate and monitor the entire detection device.

[0005] Alarm and marking system: used to sound an alarm and mark the defect location when a defect is found, usually combined with production line automation equipment such as inkjet markers or laser markers.

[0006] However, in the actual production process, the PP film moves very fast during the transmission process. Under high-speed motion conditions, if the shutter speed is slow, the object will move during exposure, resulting in motion blur. Even with a certain shutter speed, the displacement of the object in a short period of time will be relatively large, which may still cause image blur.

[0007] To this end, we propose a defect detection device for PP film production. Summary of the invention

[0008] The purpose of the present invention is to provide a defect detection device for PP film production to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solution: a defect detection device for PP film production, comprising:

[0009] A frame device, wherein the frame device is provided with rollers, and the frame device is provided with a driving belt for driving the rollers to rotate;

[0010] A polygonal mirror, wherein the polygonal mirror is arranged in an arc shape on the outside of the roller;

[0011] The rack device includes a rack 1, the rack 1 is provided with two groups, a synchronization component is provided on the outer side of the rack 1, the synchronization component is symmetrically provided with two groups about the roller, an industrial camera is provided on the synchronization component, and the industrial camera is used to shoot the PP film reflected on the polygon mirror;

[0012] The synchronization component also includes a gear 1, which is fixedly connected to the end of the roller, an intermittent component is arranged on the frame 1, a base is fixedly connected to the frame 1, a gear 2 is rotatably connected to the base, and a fixing component for fixing the industrial camera is arranged on the gear 2;

[0013] A reset component is arranged on the gear 2, and is used to rebound the gear 2 to an initial position.

[0014] Preferably, the intermittent component comprises:

[0015] Gear three, the gear three is rotatably connected to the surface of the frame one, and the gear three is meshed with the gear one;

[0016] An intermittent part is arranged on one side of gear three and is rotatably connected to a surface of a frame. A plurality of slide grooves are provided on the surface of the intermittent part, and arc grooves are provided between the slide grooves. A circular plate part is fixedly connected to gear three, and a clamping groove is provided on the edge of the circular plate part. A contact rod is fixedly connected to gear three in the clamping groove.

[0017] Preferably, a sprocket wheel 1 is fixedly connected to the top of the intermittent member, a sprocket wheel 2 is rotatably connected to the base, and a chain is connected between the sprocket wheel 1 and the sprocket wheel 2.

[0018] Preferably, the reset component comprises:

[0019] The track is arc-shaped, one end of the track is fixedly connected to the top of the base, the bottom of the gear 2 is fixedly connected to a connecting ear that is slidably connected to the track, a vortex spring is sleeved on the track, the vortex spring is elastically connected to the connecting ear, a telescopic part is arranged between the gear 2 and the sprocket 2, and limiting parts are arranged on both sides of the gear 2.

[0020] Preferably, the telescopic member comprises:

[0021] A wedge-shaped piece 1 is arranged at the edge of the second sprocket, the wedge-shaped piece 1 is slidably connected to the second sprocket, the inner wall of the second gear is fixedly connected with the wedge-shaped piece 2 abutting against the wedge-shaped piece 1, the second sprocket is provided with a spring at a place of the wedge-shaped piece, and the spring is elastically connected to the wedge-shaped piece 1.

[0022] Preferably, a camera holder is fixedly connected to the top of gear 2, a fixed shell for fixing an industrial camera is rotatably connected to the camera holder, an arc block abutting against connecting shafts on both sides of the fixed shell is slidably connected inside the camera holder, a knob rod is rotatably connected inside the arc block, and the knob rod is threadedly connected to the camera holder.

[0023] Preferably, a one-way rotation damper is provided on the top of the base, and a gear member on the top of the one-way rotation damper is meshed with gear 2.

[0024] Preferably, the wedge-shaped pieces 1 on the sprocket 2 on both sides of the roller are symmetrically arranged about the central axis of the roller.

[0025] Preferably, rectangular plates are fixedly connected to both ends of the polygonal mirror, and a support rod is fixedly connected between the rectangular plate and the frame 1.

[0026] The present invention has at least the following beneficial effects:

[0027] 1. The industrial camera and the PP film can be driven to rotate synchronously by the roller and the synchronization component, thereby eliminating motion blur, making the photos taken clearer and facilitating the detection of defects on the surface of the PP film;

[0028] 2. The roller drives gear 1 to rotate, and gear 1 cooperates with the intermittent component to drive gear 2 to rotate. The fixed component on gear 2 is used to fix the industrial camera. With the cooperation of the intermittent component, the industrial camera can move synchronously with the PP film and pause briefly, so that the industrial camera continues to shoot synchronously after the PP film that has been photographed moves out of the shooting range. This method can capture more PP film photos, thereby improving the effect of defect detection;

[0029] 3. When gear 2 cooperates with the industrial camera to rotate a semicircle, it can cooperate with the reset component to return to the initial position. At this time, the industrial camera on the other side starts to work. Only in this way can the PP film photos be continuously captured, thereby ensuring the continuity of PP film defect detection;

[0030] 4. The intermittent part rotates, and the intermittent part drives the sprocket 2 to rotate on the base through the chain. The use of the chain as a drive can make the sprocket 1 and the sprocket 2 more stable when rotating or stopping, thereby making the industrial camera more stable when shooting synchronously or stopping;

[0031] 5. When the connecting ear at the bottom of gear 2 rotates under the push of the vortex spring, the teeth on the outside of gear 2 mesh with the gear part at the bottom of the one-way rotary damper. Therefore, when gear 2 drives the industrial camera to reset, the one-way rotary damper can slow down the reset speed of gear 2, thereby preventing the connecting ear from hitting the limiter due to excessive reset speed. The one-way rotary damper does not generate resistance when sprocket 2 drives gear 2 to rotate, so gear 2 can be smoother in the process of cooperating with the industrial camera to shoot. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention;

[0034] Figure 3 It is a schematic diagram of the intermittent component structure of the present invention;

[0035] Figure 4 For the present invention Figure 3 The enlarged structural diagram of part A in the middle;

[0036] Figure 5 It is a schematic diagram of the chain structure of the present invention;

[0037] Figure 6 It is a schematic cross-sectional structural diagram of the sprocket wheel 2 of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the reset component of the present invention;

[0039] Figure 8 For the present invention Figure 7 The enlarged structural diagram of part B in the middle;

[0040] Fig. 9 It is a schematic diagram of the structure of the limiter of the present invention;

[0041] Fig.10 It is a schematic diagram of the structure of the fixing assembly of the present invention;

[0042] Fig.11 For the present invention Fig.10 Schematic diagram of the enlarged structure of part C in the middle.

[0043] In the figure: 10, rack device; 11, roller; 12, drive belt; 13, rack 1; 14, industrial camera; 20, polygon mirror; 21, rectangular plate; 22, support rod; 30, synchronization component; 31, gear 1; 32, base; 33, gear 2; 40, intermittent component; 41, gear 3; 42, intermittent member; 43, slide; 44, arc groove; 45, round plate; 46, slot; 47, Abutment rod; 421, sprocket one; 422, sprocket two; 423, chain; 50, fixing assembly; 60, reset assembly; 61, track; 62, connecting ear; 63, vortex spring; 64, limit member; 70, telescopic member; 71, wedge member one; 72, wedge member two; 73, spring; 81, camera holder; 82, fixed shell; 83, arc block; 84, knob rod; 91, one-way rotation damper. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In order to better understand the defect detection device for PP film production provided by the embodiment of the present application, the following first briefly introduces the existing defect detection device for PP film production, which can identify the defects on the surface of the material by real-time capture and analysis of the surface image of the PP film. This process usually includes the following key steps: light source illumination, image acquisition,

[0046] Image processing, defect identification: PP film needs to be transported by rollers on the production equipment. The fast-moving PP film is likely to cause the captured image to be blurred because the position of the film changes during the camera's exposure time. When the image is blurred, it becomes more difficult to identify defects, affecting the accuracy of detection.

[0047] The following is a brief overview of the present application scheme. The present scheme is achieved by installing two groups of industrial cameras 14 on the outside of the frame 13 on both sides of the roller 11, and arranging synchronization components 30 on both sides of the frame 13. The synchronization component 30 can cooperate with the roller 11 to drive the industrial camera 14 to rotate synchronously. At the same time, the intermittent component 40 in the synchronization component 30 allows the industrial camera 14 to temporarily stop during the rotation process. In this way, the industrial camera 14 can take more photos of the PP film while completing the rotation of the semicircular stroke, which is convenient for defect detection. In addition, through the cooperation of the reset component 60, when the industrial camera 14 on one side completes the shooting and resets, the industrial camera 14 on the other side starts taking pictures, thereby achieving continuous defect shooting and detection as much as possible. In addition, through the coordinated design of the synchronization component 30 and the polygonal mirror 20, the movement distance of the industrial camera 14 can be greatly reduced. This design not only improves the detection efficiency, but also ensures the comprehensiveness and continuity of the PP film defect detection.

[0048] Example 1: Please refer to Figure 1-11 The present invention provides a technical solution: a defect detection device for PP film production, comprising:

[0049] A frame device 10, on which a roller 11 is disposed, and a driving belt 12 for driving the roller 11 to rotate is disposed on the frame device 10, and the frame device 10 is installed on a PP film production machine, and the driving belt 12 is driven by a motor to drive the roller 11 to rotate, and the above are all prior arts, which are not drawn in the figure and will not be described in detail here;

[0050] A polygonal mirror 20, wherein the polygonal mirror 20 is arranged in an arc shape on the outside of the roller 11, and the PP film on the roller 11 can be reflected into the lens of the industrial camera 14 through the polygonal mirror 20;

[0051] The rack device 10 includes a rack 13, the rack 13 is provided with two groups, a synchronization component 30 is provided outside the rack 13, the synchronization component 30 is symmetrically provided with two groups about the roller 11, and an industrial camera 14 is provided on the synchronization component 30, and the industrial camera 14 is used to shoot the PP film reflected on the polygon mirror 20;

[0052] It should be noted that the industrial camera 14 can be driven to rotate synchronously with the PP film by the roller 11 in cooperation with the synchronization component 30, thereby eliminating motion blur, making the photographed photos clearer and facilitating the detection of defects on the surface of the PP film;

[0053] The synchronization component 30 also includes a gear 1 31, the gear 1 31 is fixedly connected to the end of the roller 11, the frame 1 13 is provided with an intermittent component 40, the frame 1 13 is fixedly connected with a base 32, the base 32 is rotatably connected with a gear 2 33, and the gear 2 33 is provided with a fixing component 50 for fixing the industrial camera 14;

[0054] It is worth noting that the roller 11 drives the gear 1 31 to rotate, and the gear 1 31 cooperates with the intermittent component 40 to drive the gear 2 33 to rotate. The fixing component 50 on the gear 2 33 is used to fix the industrial camera 14. Under the cooperation of the intermittent component 40, the industrial camera 14 can move synchronously with the PP film and pause briefly, so that after the photographed PP film moves out of the shooting range, the industrial camera 14 continues to shoot synchronously. In this way, more PP film photos can be captured, thereby improving the effect of defect detection;

[0055] A reset assembly 60, wherein the reset assembly 60 is disposed on the second gear 33, and the reset assembly 60 is used to rebound the second gear 33 to an initial position;

[0056] It is worth noting that after gear 2 33 cooperates with the industrial camera 14 to rotate a semicircle, it can cooperate with the reset assembly 60 to return to the initial position. At this time, the industrial camera 14 on the other side starts to work. Only in this way can PP film photos be continuously captured, thereby ensuring the continuity of PP film defect detection.

[0057] Further as Figures 3 to 6 As shown, it is worth to explain in detail that the intermittent component 40 includes:

[0058] Gear three 41, the gear three 41 is rotatably connected to the surface of the frame one 13, the gear three 41 is meshed with the gear one 31, the roller 11 drives the gear one 31 to rotate, and the gear one 31 drives the gear three 41 to rotate;

[0059] An intermittent member 42, the intermittent member 42 is arranged on one side of the gear three 41 and is rotatably connected to the surface of the frame one 13, a plurality of slide grooves 43 are provided on the surface of the intermittent member 42, arc grooves 44 are provided between the slide grooves 43, a circular plate member 45 is fixedly connected to the gear three 41, a clamping groove 46 is provided on the edge of the circular plate member 45, and the gear three 41 is located in the clamping groove 46 and is fixedly connected to an abutment rod 47;

[0060] It should be noted that the top circular plate 45 and the abutment rod 47 are driven to rotate by the gear three 41. When the abutment rod 47 enters the slide groove 43 of the intermittent part 42, the intermittent part 42 rotates on the frame 13. When the abutment rod 47 leaves the slide groove 43 on the intermittent part 42, the arc groove 44 on the intermittent part 42 abuts against the circular plate 45. At this time, the intermittent part 42 stops rotating. If the rotation speed of the gear three 41 needs to be adjusted, it can be achieved by replacing the number of teeth of the gear one 31 or the gear three 41.

[0061] Further as Figure 5 As shown, it is worth to explain in detail that the top of the intermittent member 42 is fixedly connected with a sprocket wheel 421, the base 32 is rotatably connected with a sprocket wheel 422, and a chain 423 is connected between the sprocket wheel 421 and the sprocket wheel 422;

[0062] It should be noted that, by the rotation of the intermittent member 42, the intermittent member 42 drives the sprocket 2 422 to rotate on the base 32 through the chain 423. Using the chain 423 as a drive can make the sprocket 1 421 and the sprocket 2 422 more stable when rotating or stopping, thereby making the industrial camera 14 more stable when synchronously shooting or stopping.

[0063] Further as Figures 7 to 9 As shown, it is worth to explain in detail that the reset component 60 includes:

[0064] The track 61 is arc-shaped, one end of the track 61 is fixedly connected to the top of the base 32, the bottom of the gear 2 33 is fixedly connected to a connecting ear 62 that is slidably connected to the track 61, a vortex spring 63 is sleeved on the track 61, and the vortex spring 63 is elastically connected to the connecting ear 62, a telescopic member 70 is provided between the gear 2 33 and the sprocket 2 422, and limit members 64 are provided on both sides of the gear 2 33;

[0065] It should be noted that when the sprocket 2 422 cooperates with the telescopic part 70 to drive the gear 2 33 to rotate, the connecting ear 62 at the bottom of the gear 2 33 rotates along the track 61 and compresses the spiral spring 63. At this time, the spiral spring 63 generates elastic potential energy. When the sprocket 2 422 drives the telescopic part 70 to move to the limit part 64, the telescopic part 70 shrinks into the sprocket 2 422. At this time, the gear 2 33 is not restricted by the telescopic part 70, and rotates in the opposite direction driven by the spiral spring 63 until the connecting ear 62 contacts the limit part 64 on the other side and stops moving.

[0066] Further as Figure 8 As shown, it is worth to explain in detail that the telescopic member 70 includes:

[0067] A wedge-shaped piece 71 is arranged at the edge of the second sprocket 422, and the wedge-shaped piece 71 is slidably connected to the second sprocket 422. The inner wall of the second gear 33 is fixedly connected with the wedge-shaped piece 72 abutting against the wedge-shaped piece 71. The second sprocket 422 is provided with a spring 73 at the wedge-shaped piece 71. The spring 73 is elastically connected to the wedge-shaped piece 71, and one end of the spring 73 is fixedly connected to the bottom of the wedge-shaped piece 71, and the other end of the spring 73 is fixedly connected to the second sprocket 422;

[0068] It should be noted that when sprocket 2 422 drives wedge piece 1 71 to rotate and pushes wedge piece 2 72 on the inner wall of gear 2 33 to rotate to the limit piece 64, gear 2 33 stops rotating at this time, and wedge piece 1 71 shrinks into sprocket 2 422 under the action of the inclined surface. At this time, wedge piece 1 71 is separated from wedge piece 2 72, and gear 2 33 rotates in the opposite direction and returns to its initial position. At this time, sprocket 2 422 continues to rotate until wedge piece 1 71 is reconnected with wedge piece 2 72, and this reciprocating process can be used to achieve the purpose of pushing the industrial camera 14 to continuously shoot.

[0069] According to the above embodiment, further Fig.10 , this scheme also has a second embodiment: the top of the second gear 33 is fixedly connected to a camera frame 81, and a fixed shell 82 for fixing the industrial camera 14 is rotatably connected to the camera frame 81, and an arc block 83 abutting against the connecting shafts on both sides of the fixed shell 82 is slidably connected inside the camera frame 81, and a knob rod 84 is rotatably connected inside the arc block 83, and the knob rod 84 is threadedly connected to the camera frame 81;

[0070] It should be noted that by rotating the knob rod 84, since the knob rod 84 is threadedly connected to the camera frame 81, the knob rod 84 can drive the arc block 83 to separate from the connecting shaft of the side wall of the fixed shell 82. At this time, the angle of the fixed shell 82 can be adjusted, thereby adjusting the angle between the industrial camera 14 and the polygonal mirror 20, and then adjusting the shooting range. After the adjustment is completed, the arc block 83 can be driven to be fixed to the connecting shaft of the side wall of the fixed shell 82 again by re-rotating the knob rod 84, thereby completing the purpose of fixing the industrial camera 14.

[0071] Further as Fig. 9 As shown, it is worth to explain in detail that a one-way rotation damper 91 is arranged on the top of the base 32, the bottom of the one-way rotation damper 91 is fixedly connected to the surface of the base 32, and the gear member on the top of the one-way rotation damper 91 is meshed with the gear 2 33;

[0072] It should be noted that when the connecting ear 62 at the bottom of the gear 2 33 rotates under the push of the spiral spring 63, since the teeth on the outside of the gear 2 33 are engaged with the gear part at the bottom of the one-way rotation damper 91, the one-way rotation damper 91 can slow down the reset speed of the gear 2 33 during the process of the gear 2 33 driving the industrial camera 14 to reset, thereby preventing the connecting ear 62 from hitting the limit member 64 due to the reset speed being too fast. The one-way rotation damper 91 does not generate resistance during the process of the sprocket 2 422 pushing the gear 2 33 to rotate, thereby making the gear 2 33 smoother in the process of cooperating with the industrial camera 14 to shoot.

[0073] Further as Figure 2 As shown, it is worth to explain in detail that the wedge-shaped pieces 71 on the sprocket 2 422 on both sides of the roller 11 are symmetrically arranged along the central axis of the roller 11;

[0074] It should be noted that by arranging the wedge-shaped pieces 71 on the sprocket 2 422 on both sides of the roller 11 symmetrically about the central axis of the roller 11, when the gear 2 33 on one side moves to the limit piece 64, the reset assembly 60 cooperates with the gear 2 33 to reset, and the telescopic piece 70 on the sprocket 2 422 on the other side just drives the industrial camera 14 on the gear 2 33 to shoot. In this way, when the industrial camera 14 on one side stops shooting, the industrial camera 14 on the other side continues to work, thereby achieving the purpose of improving the continuity of detection.

[0075] Further as Figure 1 As shown, it is worth to explain in detail that the two ends of the polygon mirror 20 are fixedly connected with rectangular plates 21, and the rectangular plate 21 and the frame 13 are fixedly connected with a support rod 22;

[0076] It should be noted that the polygonal mirror 20 is fixed on the frame 13 by means of a rectangular plate 21 and a support rod 22. The design of the polygonal mirror 20 can reflect the PP film into the lens of the industrial camera 14 from multiple angles, thereby providing more image details and facilitating defect detection.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A defect detection device for PP film production, comprising: A frame device (10), wherein a roller (11) is disposed on the frame device (10), and a driving belt (12) is disposed on the frame device (10) for driving the roller (11) to rotate; Features: A polygonal mirror (20), wherein the polygonal mirror (20) is arranged in an arc shape on the outside of the supporting roller (11); The frame device (10) comprises a frame one (13), the frame one (13) is provided with two groups, a synchronization component (30) is provided outside the frame one (13), the synchronization component (30) is symmetrically provided with two groups about the roller (11), an industrial camera (14) is provided on the synchronization component (30), and the industrial camera (14) is used to photograph the PP film reflected on the polygon mirror (20); The synchronization component (30) further comprises a gear one (31), the gear one (31) being fixedly connected to the end of the roller (11), an intermittent component (40) being arranged on the frame one (13), a base (32) being fixedly connected to the frame one (13), a gear two (33) being rotatably connected to the base (32), and a fixing component (50) for fixing the industrial camera (14) being arranged on the gear two (33); A reset component (60), wherein the reset component (60) is arranged on the second gear (33), and the reset component (60) is used to rebound the second gear (33) to an initial position.

2. A defect detection device for PP film production according to claim 1, characterized in that: The intermittent assembly (40) comprises: Gear three (41), the gear three (41) is rotatably connected to the surface of the frame one (13), and the gear three (41) is meshed with the gear one (31); An intermittent member (42) is arranged on one side of the gear three (41) and is rotatably connected to the surface of the frame one (13). A plurality of slide grooves (43) are provided on the surface of the intermittent member (42). An arc groove (44) is provided between the slide grooves (43). A circular plate member (45) is fixedly connected to the gear three (41). A retaining groove (46) is provided on the edge of the circular plate member (45). The gear three (41) is located in the retaining groove (46) and is fixedly connected to a contact rod (47).

3. A defect detection device for PP film production according to claim 2, characterized in that: The top of the intermittent member (42) is fixedly connected to a sprocket wheel (421), the base (32) is rotatably connected to a sprocket wheel (422), and a chain (423) is connected between the sprocket wheel (421) and the sprocket wheel (422).

4. A defect detection device for PP film production according to claim 3, characterized in that: The reset component (60) comprises: The track (61) is arc-shaped, one end of the track (61) is fixedly connected to the top of the base (32), the bottom of the gear (33) is fixedly connected to a connecting ear (62) slidably connected to the track (61), a vortex spring (63) is sleeved on the track (61), the vortex spring (63) is elastically connected to the connecting ear (62), a telescopic member (70) is arranged between the gear (33) and the sprocket (422), and limit members (64) are arranged on both sides of the gear (33).

5. A defect detection device for PP film production according to claim 4, characterized in that: The telescopic member (70) comprises: A wedge-shaped piece (71) is provided at the edge of the second sprocket (422), the wedge-shaped piece (71) is slidably connected to the second sprocket (422), the inner wall of the second gear (33) is fixedly connected with the wedge-shaped piece (72) abutting against the wedge-shaped piece (71), the second sprocket (422) is provided with a spring (73) at the wedge-shaped piece (71), and the spring (73) is elastically connected to the wedge-shaped piece (71).

6. A defect detection device for PP film production according to any one of claims 1 to 5, characterized in that: The top of the gear 2 (33) is fixedly connected to a camera frame (81), and a fixed shell (82) for fixing an industrial camera (14) is rotatably connected to the camera frame (81). An arc block (83) is slidably connected inside the camera frame (81) and abuts against connecting shafts on both sides of the fixed shell (82). A knob rod (84) is rotatably connected inside the arc block (83), and the knob rod (84) is threadedly connected to the camera frame (81).

7. A defect detection device for PP film production according to claim 5, characterized in that: A one-way rotation damper (91) is arranged on the top of the base (32), and a gear member on the top of the one-way rotation damper (91) is meshed with gear 2 (33).

8. A defect detection device for PP film production according to any one of claims 5 or 7, characterized in that: The wedge-shaped pieces 1 (71) on the sprocket 2 (422) on both sides of the roller (11) are symmetrically arranged about the central axis of the roller (11).

9. A defect detection device for PP film production according to claim 8, characterized in that: Rectangular plates (21) are fixedly connected to both ends of the polygonal mirror (20), and a support rod (22) is fixedly connected between the rectangular plate (21) and the frame 1 (13).

Images