Plastic film crack detection device and detection method

Abstract

The present invention relates to the field of crack detection technology, and discloses a plastic film crack detection device and detection method thereof, comprising a support plate, a detection component, a flattening mechanism, and a fill light mechanism, wherein: the detection component is arranged above the fill light mechanism to detect cracks on the surface of the plastic film; the flattening mechanism comprises a positioning seat, an adjustment rod, a compression spring, and a push roller, and the bottom of the positioning seat is connected to the top of the support plate by bolts. The plastic film crack detection device and detection method thereof, through the coordinated arrangement of the positioning seat and the adjustment rod, can drive the push roller to adjust to different heights by sliding the adjustment rod, thereby supporting the passing plastic film and slightly stretching it again, thereby stretching relatively hidden cracks and excessively thin areas, thereby improving the overall detection effect, and the compression spring can perform different degrees of adaptive adjustment according to the different stretching forces of the plastic film, thereby ensuring the extension effect of the plastic film.

Description

Technical Field

[0001] The present invention relates to the technical field of crack detection, and in particular to a plastic film crack detection device and a detection method thereof. Background Art

[0002] Biaxial stretching is a relatively advanced plastic film production process. The plastic film obtained by biaxial stretching has a smaller thickness and better performance. In particular, with the development of the economy, more and more fields require high-strength, high-insulation optical-grade plastic films or ultra-thin plastic films, and these plastic films can generally only be produced through the biaxial stretching process.

[0003] Plastic film is produced using a biaxial stretching process. Usually, the thicker plastic film is preheated first, then stretched in both the longitudinal and transverse directions, and then shaped to obtain a plastic film with a smaller thickness. During longitudinal stretching, the plastic film is stretched longitudinally using rollers with a certain speed ratio. During transverse stretching, the two sides of the plastic film are clamped with a clamp and the clamp is moved along a track to stretch the plastic film transversely.

[0004] During the stretching production of plastic film, cracks are easily generated due to excessive stretching. However, some cracks are often relatively thin and are not easy to identify with the human eye alone. Therefore, it is necessary to use a crack detection device to detect the plastic film and then make timely judgments on the cracks to ensure the production quality of the plastic film. The existing plastic film detection device only detects the surface of the plastic film through the detection instrument during the winding process of the plastic film. The thinner positions and more hidden cracks that appear during stretching cannot be highlighted, so that the detection instrument cannot accurately detect the existence of cracks, affecting the accuracy of the detection instrument. As a result, due to the deviation of the detection effect, the biaxial tensile force used in the production of the plastic film cannot be accurately adjusted, which will affect the production quality of the plastic film. Summary of the Invention

[0005] The present invention provides a plastic film crack detection device and a detection method thereof, which can slightly stretch the plastic film, thereby expanding relatively hidden cracks and excessively thin positions, improving detection accuracy, and avoiding affecting the production quality of the plastic film due to the detection effect.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A plastic film crack detection device is designed, including a support plate, a detection component, a flattening mechanism, and a light-filling mechanism, wherein:

[0008] The detection component is arranged above the light-filling mechanism to detect cracks on the surface of the plastic film;

[0009] The flattening mechanism includes a positioning seat, an adjusting rod, a compression spring and a push roller. The bottom of the positioning seat is connected to the top of the support plate by a bolt. The adjusting rod is slidably connected to the inner wall of the positioning seat. One end of the compression spring is fixedly connected to the inner bottom wall of the positioning seat. The other end of the compression spring is fixedly connected to the end of the adjusting rod. The push roller is rotatably connected to the outer wall of the adjusting rod for flattening the plastic film.

[0010] The fill light mechanism includes a bracket, a light bar and an air duct. The bracket is arranged on one side of the flattening mechanism. The light bar is fixedly installed in the middle of the top of the bracket to illuminate the bottom of the plastic film. The air duct is opened on the outer surface of the bracket on both sides of the light bar to guide the wind direction to assist in flattening the plastic film and reduce damage caused by contact.

[0011] Optionally, guide grooves are provided on both sides of the outer surface of the support plate, and an adjustment mechanism is slidably connected to the inner wall of the guide groove.

[0012] Optionally, the adjustment mechanism includes an adjustment seat, a support rod, a mounting rod and a fixing clamp, the outer surface of the adjustment seat is slidably connected to the inner wall of the guide groove, one end of the support rod is rotatably connected to the top of the adjustment seat, the other end of the support rod is rotatably connected to one end of the mounting rod, the inner wall of the fixing clamp is connected to the top of the mounting rod by bolts, and the outer surface of the fixing clamp is fixedly mounted to the outer wall of the detection component.

[0013] Optionally, the adjustment mechanism also includes a pressure rod and a fastening bolt, the pressure rod is threaded through the outer wall of the adjustment seat, one end of the pressure rod passes through the adjustment seat and presses against the inner wall of the guide groove, and the two fastening bolts are respectively threaded through the outer walls of the adjustment seat and the support rod.

[0014] Optionally, the top of the support plate is located on the other side of the flattening mechanism and is detachably connected to a driving mechanism, the driving mechanism including a fixed seat, a driving roller and an auxiliary roller, the bottoms of the two fixed seats are connected to the top of the support plate by bolts, the driving roller is rotatably connected between the two fixed seats, and the auxiliary roller is rotatably connected between the two fixed seats and is located below the driving roller.

[0015] Optionally, the driving mechanism further includes a motor, which is fixedly mounted on an outer wall of one of the fixing seats, and an output end of the motor is connected to an end of the driving roller via a key.

[0016] Optionally, the top of the support plate is located below the fill light mechanism and is detachably connected to a positioning mechanism, the positioning mechanism including a positioning plate, a first guide cylinder, a positioning rod and a second guide cylinder, the bottom of the positioning plate is threadedly connected to the top of the support plate, the two first guide cylinders are respectively fixedly installed on both sides of the top of the positioning plate, the two positioning rods are respectively threadedly connected to the inner wall of the first guide cylinder, and the two second guide cylinders are respectively threadedly connected to the outer surfaces of the two positioning rods.

[0017] Optionally, the fill light mechanism includes a cover plate, a guide wheel and a filter screen, the two sides of the bottom of the bracket are fixedly connected to the top of the two second guide cylinders respectively, multiple cover plates can be slidably connected to the outer wall of the bracket, multiple guide wheels can be rotatably connected to the outer wall of the cover plate, and the filter screen is fixedly installed on the inner wall of the air duct.

[0018] Optionally, the detection component includes a camera, which is fixedly mounted on the outer surface of the fixing clip.

[0019] A method for detecting cracks in a plastic film, using the above-mentioned device for detecting cracks in a plastic film, comprises:

[0020] S1. Install the driving mechanism, flattening mechanism, and positioning mechanism at the preset positions, rotate the positioning rod, and adjust the height of the fill light mechanism;

[0021] S2, the plastic film passes between the driving roller and the auxiliary roller, passes through the top of the push roller, passes over the other push roller, and passes between the other driving roller and the auxiliary roller. The motor is started to convey the plastic film, and the push roller is pushed by the elastic force of the compression spring, and the push roller pushes and extends the plastic film.

[0022] S3. Adjust the position of the cover according to the width of the plastic film to cover the excess light, connect the air duct to the external air supply equipment, and then blow the gas out to the two sides of the bracket at an inclined angle through the air duct, thereby further flattening the plastic film. At the same time, blow on the plastic film to make the cracks shake, which is convenient for detection of the detection components.

[0023] The present invention provides a plastic film crack detection device and a detection method thereof, which have the following beneficial effects:

[0024] The plastic film crack detection device and detection method thereof, through the coordinated arrangement of the positioning seat and the adjustment rod, can drive the push roller to adjust to different heights by sliding the adjustment rod, thereby supporting the passing plastic film and slightly stretching it again, thereby expanding the more hidden cracks and too thin positions, and improving the overall detection effect, and the compression spring can make different degrees of adaptive adjustment according to the different stretching forces of the plastic film, thereby ensuring the extension effect of the plastic film, and with the help of the setting of the air duct, the air can be sprayed from the air duct to both sides of the light bar, thereby blowing the upper plastic film to both sides, thereby assisting the flattening of the plastic film, and when cracks appear, the plastic film will also shake under the wind, thereby making it more convenient for the detection component to perform detection, and the wind blown out by the air duct can also cool and dissipate heat for the light bar, thereby extending the service life of the light bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall installation structure of the present invention;

[0026] Figure 2 Schematic diagram of the installation structure of the flattening mechanism in the present invention;

[0027] Figure 3 Schematic diagram of the explosion structure of the regulating mechanism in the present invention;

[0028] Figure 4 Schematic diagram of the structure of the driving mechanism of the present invention;

[0029] Figure 5 Schematic diagram of the explosion structure of the flattening mechanism in the present invention;

[0030] Figure 6 Schematic diagram of the exploded structure of the light filling mechanism in the present invention;

[0031] Figure 7 It is a schematic cross-sectional view of the light-filling mechanism of the present invention.

[0032] In the figure: 1. Support plate; 2. Guide groove; 3. Adjustment mechanism; 301. Adjustment seat; 302. Support rod; 303. Mounting rod; 304. Fixing clamp; 305. Pressure rod; 306. Fastening bolt; 4. Detection component; 5. Driving mechanism; 501. Fixing seat; 502. Driving roller; 503. Auxiliary roller; 504. Motor; 6. Flattening mechanism; 601. Positioning seat; 602. Adjustment rod; 603. Compression spring; 604. Push roller; 7. Positioning mechanism; 701. Positioning plate; 702. First guide cylinder; 703. Positioning rod; 704. Second guide cylinder; 8. Fill light mechanism; 801. Bracket; 802. Light bar; 803. Cover plate; 804. Guide wheel; 805. Air duct; 806. Filter. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work shall fall within the scope of protection of the present invention.

[0034] See also Figures 1 to 7 An embodiment of the present invention provides a crack detection device for use in crack detection during plastic film production. This embodiment improves the structure of the crack detection device to provide the advantage of secondary stretching of the plastic film. Specifically, taking plastic film production as an example, as a preferred embodiment of this embodiment, the crack detection device is a plastic film crack detection device capable of secondary stretching of the plastic film for crack detection.

[0035] See also Figures 1 to 7 The present invention provides a technical solution: a plastic film crack detection device, which is used in the scenario of detecting cracks during the production of plastic films.

[0036] The plastic film crack detection device includes a support plate 1, a detection component 4, a flattening mechanism 6 and a light-filling mechanism 8, wherein:

[0037] The detection component 4 is arranged above the light filling mechanism 8 to detect cracks on the surface of the plastic film;

[0038] The flattening mechanism 6 includes a positioning seat 601, an adjusting rod 602, a compression spring 603 and a push roller 604. The bottom of the positioning seat 601 is connected to the top of the support plate 1 by bolts. The adjusting rod 602 is slidably connected to the inner wall of the positioning seat 601. One end of the compression spring 603 is fixedly connected to the inner bottom wall (i.e., the bottom of the inner wall) of the positioning seat 601. The other end of the compression spring 603 is fixedly connected to the end of the adjusting rod 602. The push roller 604 is rotatably connected to the outer wall of the adjusting rod 602 to flatten the plastic film.

[0039] The fill light mechanism 8 includes a bracket 801, a light bar 802 and an air duct 805. The bracket 801 is arranged on one side of the flattening mechanism 6. The light bar 802 is fixedly installed in the middle of the top of the bracket 801 to illuminate the bottom of the plastic film. The air duct 805 is opened on the outer surface of the bracket 801 and is located on both sides of the light bar 802. It is used to guide the wind direction to assist in flattening the plastic film and reduce damage caused by contact.

[0040] In this embodiment, by setting up the detection component 4, cracks can be detected above the plastic film. By setting up the flattening mechanism 6, the height of the push roller 604 can be adjusted to different degrees by means of the relative floating between the positioning seat 601 and the adjusting rod 602, thereby further extending the plastic film, thereby expanding the more hidden cracks and too thin positions, and improving the overall detection effect. By setting up the compression spring 603, the adjusting rod 602 can be pushed, thereby adaptively adjusting according to the different extension forces of the plastic film. The elastic coefficient of the compression spring 603 is also sufficient to achieve the above-mentioned effect without tearing the plastic film. By setting up the fill light mechanism 8, the light bar 802 can be used to illuminate the bottom of the plastic film, thereby providing better detection conditions for the detection component 4 and avoiding the shadow part affecting the detection effect.

[0041] The inner wall of the air duct 805 is connected to an external air supply mechanism, such as an air pump, and the air is ejected from the air duct 805 to both sides of the light bar 802, blowing the plastic film above to both sides of the light bar 802, thereby helping to flatten the plastic film, so that a certain gap is left between the plastic film and the bracket 801 and the light bar 802, and the plastic film cannot contact the bracket 801 and the light bar 802, thereby avoiding friction between the plastic film above the bracket 801 and the bracket 801 and the light bar 802, thereby avoiding wear and tear.

[0042] The airflow from the air duct 805 reduces the hard connection between the bracket 801 and the light bar 802 and the plastic film. At the same time, the airflow can further flatten the plastic film, reducing wrinkles formed along the feeding direction due to contact between the roller and the straight plate and the plastic film. A soft connection is provided, which not only protects the plastic film but also improves the flattening effect of the plastic film, avoiding wrinkles on the surface of the plastic film caused by tension, which may affect the accuracy of detection.

[0043] Due to the airflow provided by the air duct 805, when cracks appear, the plastic film will also vibrate under the influence of the airflow, making it easier for the detection component 4 to capture and detect the cracks, thereby effectively improving the accuracy of the detection. The air blown by the air duct can also cool down the light bar 802, thereby extending the service life of the light bar 802 and preventing the light bar 802 from gradually heating up over time, thereby preventing the plastic film from being affected by the temperature rise of the light bar 802, thereby damaging the stability of the plastic film and making it more susceptible to tearing or wrinkling.

[0044] Since the plastic film is flattened and stretched, the airflow from the air duct 805 causes the plastic film to vibrate slightly, but does not cause significant vibrations that could affect detection. When the airflow passes through a cracked plastic film, the crack will allow airflow to pass through, causing vibrations that are more easily detected by the detection component 4.

[0045] The two air outlet ends of the air duct 805 are respectively opened on the bracket 801 at a certain angle, so that the air flow flowing out through the two air outlet ends of the air duct 805 blows on the plastic film at a certain angle. This inclination angle can be set at a thirty-degree angle between the bracket 801 and the plastic film or a sixty-degree angle between the bracket 801 and the horizontal plane. The purpose is to make the air flow blow in two opposite directions at a certain angle, help flatten the plastic film, and form an air film at the same time to prevent the plastic film from directly contacting the bracket 801 or the light strip 802.

[0046] In the above embodiment, as a preferred solution, guide grooves 2 are opened on both sides of the outer surface of the support plate 1, and the inner wall of the guide groove 2 is slidably connected with an adjustment mechanism 3. Through the setting of the guide groove 2, the sliding of the adjustment mechanism 3 can be assisted and guided, and then the position of the adjustment mechanism 3 can be adjusted.

[0047] The cam 303 of the embodiment of the present invention is a kind of special cam 304, which is a kind of special cam 304 used for adjusting the position of the cam 301 and the adjustment mechanism 302. The cam 303 of the embodiment of the present invention is a kind of special cam 304, which is a kind of special cam 304 used for adjusting the position of the cam 301 and the adjustment mechanism 302. The cam 303 of the embodiment of the present invention is a kind of special cam 304, which is a kind of special cam 304 used for adjusting the position of the cam 301 and the adjustment mechanism 302.

[0048] The detection component 4 includes a camera, which is fixedly mounted on the outer surface of the fixing clamp 304. The detection component 4 is composed of a camera and an image processing module. The camera captures the plastic film located below it and transmits the image to the image processing module. The image processing module analyzes the image captured by the camera to determine whether the plastic film has cracks.

[0049] The detection component 4 can also be a machine vision detection system, which uses a camera and image processing software to quickly and accurately detect and identify cracks on the film. The detachable fixing clip 304 also makes it easy to remove the detection component 4 for inspection and maintenance.

[0050] In the above embodiment, as a preferred solution, the adjustment mechanism 3 also includes a pressure rod 305 and a fastening bolt 306. The pressure rod 305 is threadedly penetrated into the outer wall of the adjustment seat 301, and one end of the pressure rod 305 passes through the adjustment seat 301 and is pressed against the inner wall of the guide groove 2. The two fastening bolts 306 are respectively threadedly penetrated into the outer walls of the adjustment seat 301 and the support rod 302. Through the setting of the pressure rod 305, the adjusted adjustment seat 301 can be fixed, thereby ensuring the stability of the detection component 4 during detection, and the setting of the fastening bolt 306 can fix the adjusted support rod 302 and the mounting rod 303.

[0051] In the above embodiment, as a preferred solution, the top of the support plate 1 is located on the other side of the flattening mechanism 6 and is detachably connected to a driving mechanism 5, and the driving mechanism 5 includes a fixed seat 501, a driving roller 502 and an auxiliary roller 503. The bottoms of the two fixed seats 501 are connected to the top of the support plate 1 by bolts, and the driving roller 502 is rotatably connected between the two fixed seats 501. The auxiliary roller 503 is rotatably connected between the two fixed seats 501 and is located below the driving roller 502. Through the setting of the driving mechanism 5, it can be installed on the top of the support plate 1 with the help of the fixed seat 501, thereby ensuring that the driving roller 502 and the auxiliary roller 503 are fixed, and the plastic film is driven with the help of the driving roller 502 and the auxiliary roller 503, so that it passes through the detection component 4 at a uniform speed to ensure the detection accuracy.

[0052] In the above embodiment, as a preferred solution, the driving mechanism 5 further includes a motor 504, which is fixedly mounted on the outer wall of one of the fixing seats 501. The output end of the motor 504 is connected to the end of the driving roller 502 via a key. The motor 504 can drive the driving roller 502, and the driving roller 502 and the auxiliary roller 503 can drive the plastic film.

[0053] have Figure 1 It can be seen that the two driving rollers 502 are driven by two motors 504 respectively, and the two motors 504 have the same rotational speed, so that the two driving rollers 502 rotate synchronously, avoiding the plastic film breaking when reaching the tension limit due to the rotational speed difference and causing losses;

[0054] The two driving rollers 502 rotate in the same direction rather than rotating in opposite directions.

[0055] In the above embodiment, as a preferred solution, the top of the support plate 1 is located below the fill light mechanism 8 and is detachably connected to the positioning mechanism 7. The positioning mechanism 7 includes a positioning plate 701, a first guide cylinder 702, a positioning rod 703 and a second guide cylinder 704. The bottom of the positioning plate 701 is threadedly connected to the top of the support plate 1. The two first guide cylinders 702 are respectively fixedly installed on both sides of the top of the positioning plate 701. The two positioning rods 703 are respectively threadedly connected to the inner wall of the first guide cylinder 702. The two second guide cylinders 704 are respectively threadedly connected to the outer surface of the two positioning rods 703. By rotating the positioning rod 703, the position between the first guide cylinder 702 and the second guide cylinder 704 can be relatively adjusted, and then the position of the fill light mechanism 8 can be adjusted, so that the fill light mechanism 8 is close to the plastic film, thereby achieving a better lighting effect. The setting of the positioning plate 701 can be fixed to the top of the support plate 1 and ensure the stability of the fill light mechanism 8.

[0056] In the above embodiment, as a preferred solution, the fill light mechanism 8 includes a cover plate 803, a guide wheel 804 and a filter 806. The two sides of the bottom of the bracket 801 are fixedly connected to the tops of the two second guide cylinders 704 respectively. The multiple cover plates 803 can be slidably connected to the outer wall of the bracket 801. The multiple guide wheels 804 can be rotatably connected to the outer wall of the cover plate 803. The filter 806 is fixedly installed on the inner wall of the air duct 805. Through the setting of the bracket 801, the light strip 802 can be fixed, and then the bottom of the plastic film can be adjusted. The brightness of the light bar 802 can be adjusted according to the voltage, and the light bar 802 can also be preset to a suitable brightness. The light bar 802 is a well-known technology. However, the light bar 802 is applied to the bracket 801 to illuminate the plastic film below the detection component 4, which can avoid the shadow on the plastic film caused by insufficient light and cause detection errors, thereby effectively improving the accuracy of the detection. At the same time, the light supplemented by the light bar 802 can also promptly detect wrinkles on the plastic film, thereby reducing the impact of wrinkles on crack detection.

[0057] The setting of the cover plate 803 can adjust the blocking range according to the different widths of the plastic film, thereby preventing excess light from leaking from both sides of the plastic film, thereby reducing the impact on the detection effect of the detection component 4, and preventing the edges of both ends of the light-leaking plastic film from being blurred and inconvenient to view during detection by the detection component 4. While blocking the light, the cover plate 803 can also cover the air duct 805, thereby preventing the air duct 805 from blowing on the edges of both ends of the plastic film and causing the edges of both ends of the plastic film to shake, and preventing the edges of both ends of the plastic film from being blown and shaken by the airflow, thereby preventing the accuracy of the detection by the detection component 4 from being affected, thereby reducing detection errors or misjudgments.

[0058] For example, when the width of the plastic film is 10 cm, by adjusting the number and position of the cover plates 803, the cover plates 803 can shield the air ducts 805 and the light bar 802 below both sides of the plastic film, only shielding the areas below the edges of the plastic film to prevent wind from blowing onto the edges of the plastic film. When the width of the plastic film is 8 cm, one cover plate 803 is added below both sides of the plastic film, so that the cover plates 803 can shield the air ducts 805 and the light bar 802 when testing a plastic film with a narrower width.

[0059] At the same time, through the setting of the cover 803, the structure is compact, which effectively improves the accuracy of detection. The number of uses can be adjusted according to the width of the plastic film, effectively improving the scope of application. Reasonable use of the cover 803 can effectively reduce errors and repeated detection during the detection process, thereby reducing the overall detection cost. The flexibility, shielding effect and optimized design of the cover 803 effectively improve the performance and detection accuracy of the detection component.

[0060] By setting the guide wheel 804, the obstruction of the cover plate 803 on the plastic film can be reduced. By setting the filter screen 806, the outside of the air duct 805 can be protected, and the entry of debris into the air duct 805 can be reduced.

[0061] The present invention also provides a method for detecting cracks in a plastic film, which uses the above-mentioned device for detecting cracks in a plastic film, comprising:

[0062] S1. Install the driving mechanism, flattening mechanism, and positioning mechanism at the preset positions, rotate the positioning rod, and adjust the height of the fill light mechanism;

[0063] S2, the plastic film passes between the driving roller and the auxiliary roller, passes through the top of the push roller, passes over the other push roller, and passes between the other driving roller and the auxiliary roller. The motor is started to convey the plastic film, and the push roller is pushed by the elastic force of the compression spring, and the push roller pushes and extends the plastic film.

[0064] S3. Adjust the position of the cover according to the width of the plastic film to cover the excess light, connect the air duct to the external air supply equipment, and then blow the gas out to the two sides of the bracket at an inclined angle through the air duct, thereby further flattening the plastic film. At the same time, blow on the plastic film to make the cracks shake, which is convenient for detection of the detection components.

[0065] In the present invention, the working steps of the device are as follows:

[0066] 1. First, install the driving mechanism 5, flattening mechanism 6, and positioning mechanism 7 in appropriate positions according to different usage requirements, and then rotate the positioning rod 703 to adjust the height of the fill light mechanism 8 to different degrees;

[0067] 2. Next, the plastic film is passed between the driving roller 502 and the auxiliary roller 503, then passed over the top of the push roller 604, and then passed over the other push roller 604, and then passed between the other driving roller 502 and the auxiliary roller 503. The motor 504 is started to stretch the plastic film, and the push roller 604 is pushed by the elastic force of the compression spring 603, thereby pushing and stretching the plastic film.

[0068] 3. Then, the position of the cover plate 803 is adjusted according to the width of the plastic film to cover the excess light. The air duct 805 is connected to the external air supply equipment, and the air is blown out to both sides of the bracket 801 through the air duct 805, thereby further flattening the plastic film. At the same time, the plastic film is blown to cause the cracks to vibrate, thereby facilitating detection by the detection component 4.

[0069] 4. Finally, the detection component 4 can be started to detect the passing plastic film.

[0070] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A plastic film crack detection device, characterized in that: It comprises a support plate (1), a detection component (4), a flattening mechanism (6) and a light-filling mechanism (8), wherein: The flattening mechanism (6) comprises a positioning seat (601), an adjusting rod (602), a compression spring (603) and a push roller (604), wherein the bottom of the positioning seat (601) is connected to the top of the support plate (1) by bolts, the adjusting rod (602) is slidably connected to the inner wall of the positioning seat (601), one end of the compression spring (603) is fixedly connected to the inner bottom wall of the positioning seat (601), and the other end of the compression spring (603) is fixedly connected to the end of the adjusting rod (602), and the push roller (604) is rotatably connected to the outer wall of the adjusting rod (602) for flattening the plastic film; The fill-light mechanism (8) comprises a bracket (801), a light bar (802) and an air duct (805), wherein the bracket (801) is arranged on one side of the flattening mechanism (6), and the light bar (802) is fixedly mounted on the middle part of the top of the bracket (801) to illuminate the bottom of the plastic film. The air duct (805) is opened in the bracket (801), and the air outlet ends are located on both sides of the light bar (802), and are used to guide the air flow to assist in flattening the plastic film. The detection end of the detection component (4) is located above the light-filling mechanism (8) to detect cracks on the surface of the plastic film.

2. A plastic film crack detection device according to claim 1, characterized in that: Guide grooves (2) are provided on both sides of the outer surface of the support plate (1), and an adjustment mechanism (3) is slidably connected to the inner wall of the guide groove (2).

3. The plastic film crack detection device according to claim 2, characterized in that: The adjustment mechanism (3) comprises an adjustment seat (301), a support rod (302), a mounting rod (303) and a fixing clamp (304); the outer surface of the adjustment seat (301) is slidably connected to the inner wall of the guide groove (2); one end of the support rod (302) is rotatably connected to the top of the adjustment seat (301); the other end of the support rod (302) is rotatably connected to one end of the mounting rod (303); the inner wall of the fixing clamp (304) is connected to the top of the mounting rod (303) by bolts; and the outer surface of the fixing clamp (304) is fixedly mounted to the outer wall of the detection assembly (4).

4. The plastic film crack detection device according to claim 3, characterized in that: The adjustment mechanism (3) further comprises a pressure rod (305) and a fastening bolt (306), wherein the pressure rod (305) is threadedly provided on the outer wall of the adjustment seat (301), and one end of the pressure rod (305) extending out of the adjustment seat (301) abuts against the inner wall of the guide groove (2), and the two fastening bolts (306) are threadedly provided on the outer walls of the adjustment seat (301) and the support rod (302), respectively.

5. The plastic film crack detection device according to claim 1, characterized in that: The top of the support plate (1) is located on the other side of the flattening mechanism (6) and is detachably connected to a driving mechanism (5), the driving mechanism (5) comprising a fixed seat (501), a driving roller (502) and an auxiliary roller (503), the bottoms of the two fixed seats (501) are connected to the top of the support plate (1) by bolts, the driving roller (502) is rotatably connected between the two fixed seats (501), and the auxiliary roller (503) is rotatably connected between the two fixed seats (501) and is located below the driving roller (502).

6. The plastic film crack detection device according to claim 5, characterized in that: The driving mechanism (5) further comprises a motor (504), wherein the motor (504) is fixedly mounted on the outer wall of one of the fixing seats (501), and an output end of the motor (504) is connected to an end of the driving roller (502) via a key.

7. The plastic film crack detection device according to claim 1, characterized in that: The top of the support plate (1) is located below the fill light mechanism (8) and is detachably connected to a positioning mechanism (7), the positioning mechanism (7) comprising a positioning plate (701), a first guide cylinder (702), a positioning rod (703) and a second guide cylinder (704), the bottom of the positioning plate (701) being threadedly connected to the top of the support plate (1), the two first guide cylinders (702) being fixedly mounted on both sides of the top of the positioning plate (701), the two positioning rods (703) being threadedly connected to the inner wall of the first guide cylinder (702), and the two second guide cylinders (704) being threadedly connected to the outer surfaces of the two positioning rods (703).

8. The plastic film crack detection device according to claim 7, characterized in that: The fill light mechanism (8) comprises a cover plate (803), a guide wheel (804) and a filter (806); the two sides of the bottom of the bracket (801) are fixedly connected to the tops of the two second guide cylinders (704) respectively; a plurality of the cover plates (803) are slidably connected to the outer wall of the bracket (801); a plurality of the guide wheels (804) are rotatably connected to the outer wall of the cover plate (803); and the filter (806) is fixedly installed on the inner wall of the air duct (805).

9. The plastic film crack detection device according to claim 4, characterized in that: The detection component (4) comprises a camera, which is fixedly mounted on the outer surface of the fixing clamp (304).

10. A method for detecting cracks in a plastic film, characterized in that: The plastic film crack detection device according to any one of claims 1 to 9 comprises: S1. Install the driving mechanism, flattening mechanism, and positioning mechanism at the preset positions, rotate the positioning rod, and adjust the height of the fill light mechanism; S2, the plastic film passes between the driving roller and the auxiliary roller, passes through the top of the push roller, passes over the other push roller, and passes between the other driving roller and the auxiliary roller. The motor is started to convey the plastic film, and the push roller is pushed by the elastic force of the compression spring, and the push roller pushes and extends the plastic film. S3. Adjust the position of the cover according to the width of the plastic film to cover the excess light, connect the air duct to the external air supply equipment, and then blow the gas out to the two sides of the bracket at an inclined angle through the air duct, thereby further flattening the plastic film. At the same time, blow on the plastic film to make the cracks shake, which is convenient for detection of the detection components.

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