Intelligent detection device for flaws of PVC (polyvinyl chloride) film

Abstract

The invention relates to the technical field of PVC film processing detection, in particular to an intelligent PVC film flaw detection device which comprises a base, a controller, winding roller sets, a support, an infrared detector, a supporting column, an electric push rod and a marking instrument, the controller for controlling operation of all electrical components is installed on the side portion of the base, the winding roller sets are installed on the two sides of the upper portion of the base, and the infrared detector is installed on the support. A support is arranged in the middle of the upper portion of the base, a supporting column is arranged on the rear portion of the upper portion of the base, an electric push rod with a downward telescopic end is installed on the upper portion of the supporting column, a marking instrument is arranged at the telescopic end of the electric push rod, and an edge positioning set for assisting alignment of the edges of PVC films is arranged in the middle of the base. According to the invention, through automatic traction of the film by the winding roller group, dynamic deviation correction by the edge positioning group, real-time scanning by the infrared detector and accurate marking by the marking instrument, unmanned detection of the whole process from feeding to discharging is realized, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of PVC film processing and detection, and particularly to an intelligent detection device for PVC film defects. Background Art

[0002] PVC film (polyvinyl chloride film) is a flexible sheet made from polyvinyl chloride resin as the main raw material, added with modifiers such as plasticizers, stabilizers, and lubricants, through calendering or blow molding processes.

[0003] Currently, the defect detection technology in PVC film production mainly relies on manual visual inspection or traditional optoelectronic detection equipment. Operators need to conduct naked-eye screening for a long time in strong light or special lighting environments, which is susceptible to visual fatigue, distraction, and differences in experience, resulting in difficulty in stably identifying small or low-contrast defects. Especially in the scenario of high-speed film operation, the tracking ability of the human eye is limited, thus significantly reducing the detection coverage rate and consistency.

[0004] In addition, traditional deviation rectification devices rely on hard limiting rollers to directly clamp the film edge. During the deviation rectification process, due to the difference in material hardness between the roller body and the film contact surface, sliding friction will occur, and long-term operation will cause wear, deformation, and even tearing of the film edge.

[0005] Therefore, an intelligent detection device for PVC film defects is specifically designed to solve the above technical problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides an intelligent detection device for PVC film defects.

[0007] The technical solution is: an intelligent detection device for PVC film defects, including a base, a controller, a winding roller group, a bracket, an infrared detector, a support column, an electric push rod, a marker, and an edge positioning group. A controller for controlling the operation of each electrical component is installed on the side of the base. Winding roller groups are installed on both sides of the upper part of the base, and the rollers of the two winding roller groups respectively correspond to the feeding end and the discharging end. A bracket is arranged in the middle of the upper part of the base. Infrared detectors with the detection ends facing down are installed on both sides of the truss on the upper part of the bracket. A support column is arranged at the rear of the upper part of the base, and an electric push rod with the telescopic end facing down is installed on the upper part of the support column. A marker is arranged on the telescopic end of the electric push rod. An edge positioning group for assisting in aligning the PVC film edge is arranged in the middle of the base.

[0008] Further explanation, the edge positioning group includes an installation guide seat, a bidirectional electric cylinder, a sliding seat, a limiting roller, a detection module, a distance sensor and a first spring. An installation guide seat is provided at the front of the upper part of the base. In the middle of the upper part of the installation guide seat, a bidirectional electric cylinder is installed. Sliding seats are arranged on both driving ends of the bidirectional electric cylinder. The sliding seats are slidably connected to the installation guide seat. Symmetric limiting rollers are rotatably arranged on both sides of the upper parts of the two sliding seats. A detection module is arranged between the symmetric limiting rollers corresponding to the upper parts of the two sliding seats. A distance sensor is embedded and installed on the outer side of the upper part of each sliding seat. The distance sensor is close to the detection module. A first spring is arranged at the sliding connection of the detection module and the sliding seat.

[0009] Further explanation, it also includes a motor, a load-bearing plate, a lead screw, a bidirectional slide rail, a moving seat and a clamping roller. Motors with output ends facing outwards are installed in the middle parts of the two sliding seats. Load-bearing plates are slidably arranged on the outer sides of the middle parts of the two sliding seats. A lead screw is rotatably penetrated through the middle of the load-bearing plate. The lead screw is connected to the output shaft of the motor. Bidirectional slide rails are symmetrically arranged on the upper side parts of the load-bearing plate. Two moving seats are slidably arranged between the bidirectional slide rails. Clamping rollers are rotatably arranged on each moving seat.

[0010] Further explanation, it also includes a fixed seat, a limiting guide seat, a contact frame, a matching block, a second spring, an adjusting roller, a connecting rod and a gear. A fixed seat is installed in the middle of the upper part of the base. Limiting guide seats are arranged on both sides of the upper part of the fixed seat. Each of the two limiting guide seats is composed of two sliding parts with opposite sliding directions. Contact frames are slidably arranged on the upper side parts of the limiting guide seats. The adjacent surfaces of the two contact frames extend towards each other. Limiting chutes are opened at the lower parts of their extending parts. A matching block is slidably arranged in the limiting chute. The two matching blocks are respectively connected to the side parts of the corresponding moving seats above. The upper part of the contact frame is zigzag. Vertical teeth are opened on the side of the zigzag part. A second spring is arranged at the sliding connection of the contact frame and the limiting guide seat. There are two adjusting rollers. The upper two sliding parts are rotatably connected to one adjusting roller, and the lower two sliding parts are rotatably connected to the other adjusting roller. A connecting rod is rotatably connected to the side parts of the upper and lower two sliding parts on the same side. A gear is arranged in the middle of the side part of the connecting rod. The toothed part of the contact frame meshes with the gear.

[0011] Further explanation, when the upper moving seats descend simultaneously, they drive the matching blocks and the contact frames to move down together, and compress the second spring. The toothed part of the contact frame meshes with the gear, causing it to rotate, and drives the connecting rod to rotate, so that each sliding part drives the two adjusting rollers to approach each other to realize the tension adjustment of the PVC film.

[0012] Further explanation, it also includes a wiping roller and a torsion spring. A wiping roller is hinged between the upper parts of the two bearing seats of the winding roller group at the feeding end. Torsion springs are arranged at the hinged parts of the two mounting rods on the side of the wiping roller and the winding roller group.

[0013] Further description: It also includes a collection box. A collection box is arranged between the two mounting rods on the side of the wiping roller. The end of the collection box is closely attached to the surface of the wiping roller to scrape the dust on its surface.

[0014] Further description: It also includes an access pipe and a suction hopper. An access pipe connected to an external suction device is arranged between the upper parts of the two bearing seats of the winding roller group at the feeding end. The lower part of the access pipe is communicated with a suction hopper. The suction end of the suction hopper is close to the lower collection box and the upper surface of the wiping roller.

[0015] The beneficial effects of the present invention are as follows: 1. Through the automatic traction of the winding roller group, the dynamic deviation correction of the edge positioning group, the real-time scanning of the infrared detector and the accurate marking of the marker, the whole process of the invention realizes unmanned detection from feeding to discharging, improving the detection efficiency.

[0016] 2. Through the elastic contact between the limiting roller and the first spring in the edge positioning group, when dynamically adjusting the position of the film, rigid friction damage to the edge is avoided, and at the same time, the deviation of the film center line is reduced, ensuring the positioning accuracy of the detection area.

[0017] 3. Through the bidirectional electric cylinder driving the sliding seat and the real-time feedback of the distance sensor, the invention can quickly respond and adjust the film offset, improve the deviation correction efficiency, adapt to the high-speed production scenario of the line, and fuse the data of the detection module and the distance sensor to eliminate the error of a single sensor, so as to improve the alignment accuracy.

[0018] 4. Through the contact frame and the gear meshing mechanism, the invention converts the change of the film tension into the adjustment of the distance between the adjustment rollers, realizes the dynamic balance of the tension, and reduces the flatness error of the film.

[0019] 5. Through the wiping roller being closely attached to the surface of the film under the action of the torsion spring, the invention rotates and wipes to remove dust particles, avoiding dust interference with the infrared detection accuracy. The hinged design of the torsion spring enables the wiping roller to automatically adjust the pressure with the change of the film thickness, avoiding uneven film thickness.

[0020] 6. Through the scraper of the collection box being in close contact with the surface of the wiping roller, the invention guides the dust into the box for centralized storage, reducing secondary pollution. The suction hopper is connected to an external vacuum device through the access pipe to adsorb residual particles, forming a two-stage cleaning system with the wiping roller, thereby improving the cleanliness of the detection environment. Description of the Drawings

[0021] Figure 1 It is a schematic assembly structure diagram of the present invention.

[0022] Figure 2 It is a three-dimensional structure diagram of the base, controller, winding roller group and other components of the present invention.

[0023] Figure 3 It is a three-dimensional structure diagram of the base, winding roller group and installation guide seat and other components of the present invention.

[0024] Figure 4 This is a schematic cross-sectional structure diagram of components such as the sliding seat, limiting roller, and detection module of the present invention.

[0025] Figure 5 This is a schematic three-dimensional structure diagram of components such as the installation guide seat, bidirectional electric cylinder, and load-bearing plate of the present invention.

[0026] Figure 6 This is a schematic three-dimensional structure diagram of components such as the installation guide seat, motor, and fixed seat of the present invention.

[0027] Figure 7 This is a schematic three-dimensional structure diagram of components such as the limiting guide seat, connecting rod, and gear of the present invention.

[0028] Figure 8 This is a schematic three-dimensional structure diagram of components such as the bidirectional sliding rail, contact frame, and fitting block of the present invention.

[0029] Figure 9 This is a schematic cross-sectional structure diagram of components such as the contact frame, spring two, and limiting guide seat of the present invention.

[0030] Figure 10 This is a schematic three-dimensional structure diagram of components such as the winding roller group, wiping roller, and torsion spring of the present invention.

[0031] Figure 11 This is a schematic three-dimensional structure diagram of components such as the wiping roller, torsion spring, and collection frame of the present invention.

[0032] Figure 12 This is a schematic three-dimensional structure diagram of components such as the wiping roller, torsion spring, and collection frame of the present invention.

[0033] In the above drawings: 1: Base, 11: Controller, 2: Winding roller group, 3: Bracket, 31: Infrared detector, 4: Support column, 41: Electric push rod, 42: Marker, 5: Installation guide seat, 51: Bidirectional electric cylinder, 52: Sliding seat, 521: Limiting roller, 53: Detection module, 54: Distance sensor, 55: Spring one, 6: Motor, 61: Load-bearing plate, 62: Lead screw, 63: Bidirectional sliding rail, 64: Moving seat, 65: Clamping roller, 7: Fixed seat, 71: Limiting guide seat, 72: Contact frame, 73: Fitting block, 74: Spring two, 75: Adjusting roller, 76: Connecting rod, 77: Gear, 8: Wiping roller, 81: Torsion spring, 82: Collection frame, 83: Access pipe, 84: Suction hopper. Detailed implementation manners

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. The technical solutions of the present invention will be clearly and completely described below with reference to the drawings. It should be noted that the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Embodiment: An intelligent detection device for PVC film defects, as Figures 1 - 6 and Figure 10 shown, includes a base 1, a controller 11, a winding roller group 2, a bracket 3, an infrared detector 31, a support column 4, an electric push rod 41, a marker 42 and an edge positioning group. The base 1 serves as the main support structure of the device, carrying all functional modules to ensure the precise positioning of each component on the horizontal plane. A controller 11 for controlling the operation of each electrical component is installed on the side of the base 1. The controller 11 is connected to each electrical component through electrical lines. Winding roller groups 2 are installed on both sides of the upper part of the base 1. The rollers of the two winding roller groups 2 correspond to the feeding end and the discharging end respectively. The winding roller group 2 at the feeding end releases the PVC film to be detected at a constant speed, and cooperates with the synchronous traction of the winding roller at the discharging end to ensure the smooth movement of the film. The discharging end receives the detected and marked film to maintain a constant tension and avoid wrinkles. A bracket 3 is provided in the middle of the upper part of the base 1 through bolts. Infrared detectors 31 with the detection ends facing down are installed on both sides of the truss of the upper part of the bracket 3 through bolts. The infrared detectors 31 scan the surface of the film at a high frame rate, analyze the difference in the intensity of the reflected light, identify defects such as scratches, bubbles, impurities, etc., and feedback the coordinate data to the controller 11. The bracket 3 provides a truss-type support structure to ensure that the infrared detectors 31 maintain a fixed height and angle directly above the film. A support column 4 is provided at the rear of the upper part of the base 1 through bolts. An electric push rod 41 with the telescopic end facing down is installed on the upper part of the support column 4. A marker 42 is provided on the telescopic end of the electric push rod 41 through a quick-release interface. The marker 42 marks the defect position by spraying or stamping, which is convenient for subsequent repair or sorting. The electric push rod 41 drives the marker 42 to press down or reset according to the instructions of the controller 11 to achieve the defect marking action. An edge positioning group for assisting in aligning the edges of the PVC film is provided in the middle of the base 1. The controller 11 serves as the control center, coordinating the traction speed of the winding roller group 2, the deviation correction action of the edge positioning group, the signal processing of the infrared detector 31 scanning, and the triggering logic of the marker 42 to achieve full-process automatic control.

[0037] As shown Figures 3 - 6 in the figure, the edge positioning group includes an installation guide base 5, a bidirectional electric cylinder 51, a sliding seat 52, a limiting roller 521, a detection module 53, a distance sensor 54, and a first spring 55. An installation guide base 5 is provided at the front of the upper part of the base 1. A bidirectional electric cylinder 51 is installed in the middle of the upper part of the installation guide base 5. Sliding seats 52 are provided on both driving ends of the bidirectional electric cylinder 51. The sliding seats 52 are slidably connected to the installation guide base 5. Symmetric limiting rollers 521 are rotatably arranged on both sides of the upper parts of the two sliding seats 52 through bearings. The limiting rollers 521 rotate in contact with the edge of the film to provide flexible guidance and avoid hard friction damage. A detection module 53 is arranged between the symmetric limiting rollers 521 corresponding to the upper parts of the two sliding seats 52. The detection module 53 can detect the offset of the film edge through a contact microswitch or a pressure sensor carried by an external device, and trigger a deviation correction action. The sliding seats 52 carry the limiting rollers 521 and the detection module 53, and slide along the installation guide base 5 to dynamically adjust the position of the film edge. Distance sensors 54 are embedded on the outer sides of the upper parts of the two sliding seats 52. The distance sensors 54 non-contact monitor the distance between the film edge and the detection module 53 to provide real-time position feedback. The distance sensors 54 are close to the detection module 53. A first spring 55 is arranged at the sliding connection of the detection module 53 and the sliding seat 52. The first spring 55 buffers the contact pressure between the film edge and the detection module 53 to avoid rigid collision damage to the film.

[0038] As shown Figures 5 - 8 in the figure, it further includes a motor 6, a bearing plate 61, a lead screw 62, a bidirectional slide rail 63, a moving seat 64, and a clamping roller 65. Motors 6 with output ends facing outwards are installed in the middle parts of the two sliding seats 52. Bearing plates 61 are slidably arranged on the outer side parts of the middle parts of the two sliding seats 52. A lead screw 62 is rotatably penetrated through the middle part of the bearing plate 61. The bearing plate 61 is in threaded cooperation with the lead screw 62 through a nut. The lead screw 62 is connected to the output shaft of the motor 6 through a coupling. The lead screw 62 converts the rotational motion of the motor into the linear displacement of the bearing plate 61. Bidirectional slide rails 63 are symmetrically arranged on the upper side parts of the bearing plate 61. Two moving seats 64 are slidably arranged between the bidirectional slide rails 63. Clamping rollers 65 are rotatably arranged on each moving seat 64 through bearings. The motor 6 drives the lead screw 62 to rotate, driving the bearing plate 61 to slide outwards to adjust the position of the clamping rollers 65. The clamping rollers 65 apply symmetric clamping forces from both sides of the film to eliminate edge wrinkles and improve the alignment accuracy.

[0039] As shown Figures 5 - 9As shown in the figure, it further includes a fixed seat 7, a limit guide seat 71, a contact frame 72, a fitting block 73, a second spring 74, an adjusting roller 75, a connecting rod 76, and a gear 77. A fixed seat 7 is installed at the middle of the upper part of the base 1. On both sides of the upper part of the fixed seat 7, limit guide seats 71 are provided by screws. Both limit guide seats 71 are composed of two sliding parts with opposite sliding directions. Contact frames 72 are slidably arranged on the upper sides of the two limit guide seats 71. The adjacent surfaces of the two contact frames 72 extend towards each other. Limiting chutes are opened at the lower parts of their extending parts. Fitting blocks 73 are slidably arranged in the limiting chutes. The two fitting blocks 73 are respectively connected to the side parts of the corresponding moving seats 64 above. The upper part of the contact frame 72 is zigzag, and vertical teeth are opened on the side of the zigzag part. A second spring 74 is arranged at the sliding connection between the contact frame 72 and the limit guide seat 71. There are two adjusting rollers 75. One of the upper two sliding parts is rotationally connected to one adjusting roller 75, and the other of the lower two sliding parts is rotationally connected to the other adjusting roller 75. The limit guide seat 71 guides the adjusting roller 75 to move horizontally through the sliding parts to control the film tension. A connecting rod 76 is rotatably connected to the side parts of the upper and lower two sliding parts on the same side. A gear 77 is arranged at the middle of the side part of the connecting rod 76. The toothed part of the contact frame 72 meshes with the gear 77. The contact frame 72 converts the displacement of the moving seat 64 into the rotational movement of the gear 77 to achieve tension feedback and adjustment. When the upper moving seat 64 descends simultaneously, it drives the fitting block 73 and the contact frame 72 to move downward together, and squeezes the second spring 74. The toothed part of the contact frame 72 meshes with the gear 77. The gear 77 and the connecting rod 76 drive the sliding parts of the limit guide seat 71 to move in the opposite direction through meshing transmission, control the distance between the adjusting rollers 75, make them rotate, and drive the connecting rod 76 to rotate, so that each sliding part drives the two adjusting rollers 75 to approach each other to achieve the tension adjustment of the PVC film.

[0040] As Figures 10 - 12 shown, it further includes a wiping roller 8 and a torsion spring 81. A wiping roller 8 is hinged between the upper parts of the two bearing seats of the winding roller group 2 at the feeding end. The wiping roller 8 removes the dust on the film surface through rotational friction to ensure the cleanliness of the detection area. Torsion springs 81 are arranged at the hinge joints between the two mounting rods on the side of the wiping roller 8 and the winding roller group 2.

[0041] As Figure 11 and Figure 12 shown, it further includes a collection box 82. A collection box 82 is welded between the two mounting rods on the side of the wiping roller 8. The end of the collection box 82 is closely attached to the surface of the wiping roller 8 to scrape the dust on its surface and collect it centrally to avoid secondary pollution.

[0042] As Figure 10 and Figure 11As shown in the figure, it further includes an access pipe 83 and a suction hopper 84. An access pipe 83 connected to an external suction device is arranged between the upper parts of two bearings of the winding roller group 2 at the feeding end. The lower part of the access pipe 83 is connected with a suction hopper 84 through a flange. The suction end of the suction hopper 84 is close to the upper surface of the wiping roller 8 and the collection frame 82 below. The suction hopper 84 is connected to an external suction device to suck up the scattered dust and maintain a clean environment.

[0043] During use, the controller 11 starts the synchronous rotation of the winding roller groups 2 at the feeding end and the discharging end to drive the PVC film to move horizontally along the base 1. When the film enters the device, the edge positioning group starts to work. The bidirectional electric cylinder 51 on the installation guide seat 5 drives the two sliding seats 52 to move towards each other, driving the limiting rollers 521 to contact the edge of the film. The distance sensor 54 monitors the position of the film edge in real time. If the deviation exceeds the threshold, a feedback signal is sent to the controller 11, and the bidirectional electric cylinder 51 finely adjusts the position of the sliding seat 52. The surface of the detection module 53 maintains a micro distance from the film edge. When the deviation of the film exceeds the threshold, the film edge directly contacts the detection module 53 and pushes it to move. After the first spring 55 is squeezed, a displacement signal is generated to trigger the controller 11 to adjust the action of the bidirectional electric cylinder 51. At the same time, the first spring 55 can buffer the contact pressure to avoid rigid friction from damaging the film edge. The detection module 53 on the sliding seat 52 combines the data of the distance sensor 54 to ensure that the film is always in the center line position. At the same time, the motor 6 on the sliding seat 52 drives the lead screw 62 to rotate, driving the bearing plate 61 to slide outwards. The two moving seats 64 on the bidirectional slide rail 63 drive the clamping rollers 65 to clamp the film edge from both sides, eliminating wrinkles and improving the edge alignment accuracy. The wiping roller 8 above the winding roller group 2 at the feeding end closely adheres to the film surface under the action of the torsion spring 81 and rotates to wipe off the surface dust. The collection frame 82 closely adheres to the surface of the wiping roller 8 to scrape and collect the attached dust; the suction hopper 84 is connected to an external suction device through the access pipe 83 to suck up the scattered dust from the collection frame 82 and keep the detection environment clean. The infrared detectors 31 on both sides of the bracket 3 perform high-precision scanning on the film surface to identify defects such as scratches, bubbles, and impurities through the difference in reflected light intensity. When a defect is detected, the controller 11 records the position coordinates and controls the electric push rod 41 on the support column 4 to press down, so that the marker 42 sprays or imprints a mark on the film defect. After the marking is completed, the electric push rod 41 resets, and the infrared detector 31 continues to scan the subsequent area. When the film tension is abnormal, the moving seat 64 drives the matching block 73 to move down along the limiting chute of the contact frame 72, compressing the second spring 74, triggering the engagement of the gear teeth of the contact frame 72 and the gear 77. The rotation of the gear 77 drives the connecting rod 76 to rotate, causing the upper and lower sliding parts on the limiting guide seat 71 to move in the opposite direction, and the distance between the two adjusting rollers 75 is automatically adjusted. When the tension is too large, the two adjusting rollers 75 move away from each other (loosening the film), and when the tension is too small, the two adjusting rollers 75 move closer to each other (tightening the film). This process realizes stepless adjustment through the engagement of the second spring 74 and the gear 77 to ensure that the film passes through the detection area smoothly.

[0044] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An intelligent detection device for PVC film defects, comprising a base (1); characterized in that, It also includes a controller (11), a winding roller group (2), a bracket (3), an infrared detector (31), a support column (4), an electric push rod (41), a marker (42) and an edge positioning group. A controller (11) for controlling the operation of each electrical component is installed on the side of the base (1). Winding roller groups (2) are installed on both sides of the upper part of the base (1). The rollers of the two winding roller groups (2) correspond to the feeding end and the discharging end respectively. A bracket (3) is arranged in the middle of the upper part of the base (1). Infrared detectors (31) with the detection ends facing down are installed on both sides of the truss on the upper part of the bracket (3). A support column (4) is arranged at the rear of the upper part of the base (1). An electric push rod (41) with the telescopic end facing down is installed on the upper part of the support column (4). A marker (42) is arranged on the telescopic end of the electric push rod (41). An edge positioning group for assisting in aligning the edges of the PVC film is arranged in the middle of the base (1).

2. The intelligent PVC film defect detection device according to claim 1, characterized in that, The edge positioning group includes an installation guide seat (5), a bidirectional electric cylinder (51), a sliding seat (52), a limiting roller (521), a detection module (53), a distance sensor (54) and a first spring (55). An installation guide seat (5) is arranged at the front of the upper part of the base (1). A bidirectional electric cylinder (51) is installed in the middle of the upper part of the installation guide seat (5). Sliding seats (52) are arranged on both driving ends of the bidirectional electric cylinder (51). The sliding seats (52) are slidably connected to the installation guide seat (5). Symmetric limiting rollers (521) are rotatably arranged on both sides of the upper parts of the two sliding seats (52). A detection module (53) is arranged between the symmetric limiting rollers (521) corresponding to the upper parts of the two sliding seats (52). Distance sensors (54) are embedded and installed on the outer sides of the upper parts of the two sliding seats (52). The distance sensors (54) are close to the detection module (53). A first spring (55) is arranged at the sliding connection between the detection module (53) and the sliding seat (52).

3. An intelligent detection device for PVC film defects according to claim 2, characterized in that It also includes a motor (6), a load-bearing plate (61), a lead screw (62), a bidirectional slide rail (63), a moving seat (64) and a clamping roller (65). Motors (6) with the output ends facing outwards are installed in the middle of the two sliding seats (52). Load-bearing plates (61) are slidably arranged on the outer sides of the middle parts of the two sliding seats (52). A lead screw (62) is rotatably penetrated through the middle of the load-bearing plate (61). The lead screw (62) is connected to the output shaft of the motor (6). Bidirectional slide rails (63) are symmetrically arranged on the upper side parts of the load-bearing plate (61). Two moving seats (64) are slidably arranged between the bidirectional slide rails (63). Clamping rollers (65) are rotatably arranged on each moving seat (64).

4. An intelligent detection device for PVC film defects according to claim 3, characterized in that, It further includes a fixed seat (7), a limit guide seat (71), a contact frame (72), a matching block (73), a second spring (74), an adjusting roller (75), a connecting rod (76) and a gear (77). A fixed seat (7) is installed at the middle of the upper part of the base (1). Limit guide seats (71) are arranged on both sides of the upper part of the fixed seat (7). Each of the two limit guide seats (71) is composed of two sliding parts with opposite sliding directions. Contact frames (72) are slidably arranged on the upper sides of the limit guide seats (71). The adjacent surfaces of the two contact frames (72) extend towards each other. Limiting chutes are opened at the lower parts of their extending parts. A matching block (73) is slidably arranged in the limiting chute. The two matching blocks (73) are respectively connected to the side parts of the corresponding moving seats (64) above. The upper part of the contact frame (72) is zigzag, and vertical teeth are opened at the side of the zigzag part. A second spring (74) is arranged at the sliding connection part between the contact frame (72) and the limit guide seat (71). There are two adjusting rollers (75). The upper two sliding parts are rotationally connected to one adjusting roller (75), and the lower two sliding parts are rotationally connected to the other adjusting roller (75). The upper and lower sliding parts on the same side are jointly rotationally connected to a connecting rod (76) at the side part. A gear (77) is arranged at the middle of the side part of the connecting rod (76). The toothed part of the contact frame (72) meshes with the gear (77).

5. An intelligent PVC film defect detection device according to claim 4, characterized in that, When the upper moving seats (64) descend simultaneously, they drive the matching blocks (73) and the contact frames (72) to move downward together, and compress the second spring (74). The toothed part of the contact frame (72) meshes with the gear (77), causing it to rotate, and driving the connecting rod (76) to rotate, so that each sliding part drives the two adjusting rollers (75) to approach each other to achieve the tension adjustment of the PVC film.

6. An intelligent PVC film defect detection device according to claim 5, characterized in that, It further includes a wiping roller (8) and a torsion spring (81). A wiping roller (8) is hinged between the upper parts of the two bearing seats of the winding roller group (2) at the feeding end. Torsion springs (81) are arranged at the hinge joints between the two mounting rods on the side part of the wiping roller (8) and the winding roller group (2).

7. An intelligent PVC film defect detection device according to claim 6, characterized in that, It further includes a collection frame (82). A collection frame (82) is arranged between the two mounting rods on the side part of the wiping roller (8). The end of the collection frame (82) is closely attached to the surface of the wiping roller (8) to scrape the dust on its surface.

8. An intelligent PVC film defect detection device according to claim 7, characterized in that, It further includes an access pipe (83) and a suction hopper (84). An access pipe (83) connected to an external suction device is arranged between the upper parts of the two bearing seats of the winding roller group (2) at the feeding end. A suction hopper (84) is communicated with the lower part of the access pipe (83). The suction end of the suction hopper (84) is close to the upper surfaces of the collection frame (82) and the wiping roller (8) below.

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