An automatic thickness measuring device for plastic film and a method for measuring the thickness thereof

Abstract

The application discloses a kind of automatic thickness gauge of plastic film and its thickness measuring method, belong to film body thickness gauge and method technical field, comprising: drive roll, the first guide wheel is equipped between the drive roll and conveying line, the conveying line one end is connected with winding roll along the film conveying direction, the conveying line is installed on frame and extends along preset direction, to carry and transport film;First thickness measuring mechanism, the first thickness measuring mechanism includes the bidirectional electric push rod placed on the side plate of the first guide wheel both ends, the push plate of the one end of the bidirectional electric push rod and the first slider of both ends are all connected by first swing bar, and the first slider is connected with strip slot along the height direction of fixed plate.The application can solve the technical problems that the film needs to be positioned and clamped, needs to maintain a corresponding stationary state, consumes time and reduces work efficiency, the particles on the film or flatness cannot meet the corresponding requirements, resulting in poor measurement accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic film detection devices and methods, and particularly relates to an automatic thickness gauge for plastic films and a thickness measurement method thereof. Background Art

[0002] Plastic film is made of polyvinyl chloride, polyethylene, polypropylene, polystyrene, and other resins, and is used for packaging and as a coating. Plastic packaging and plastic packaging products are increasingly occupying a larger share of the market, especially composite plastic flexible packaging, which has been widely used in the food, pharmaceutical, chemical and other fields. Food packaging accounts for the largest proportion, such as beverage packaging, frozen food packaging, retort food packaging, fast food packaging, etc. These products have brought great convenience to people's lives.

[0003] Plastic film thickness gauges are precision instruments designed for measuring the thickness of materials such as plastic film, sheet, paper, foil, and silicon wafers. They utilize mechanical contact and non-destructive methods such as ultrasonic, X-ray, or optical methods. They offer resolutions up to 0.1 micron, a measurement range of 0-12 mm, and adjustable pressure depending on the material type. These instruments are widely used for quality inspection in the food packaging, pharmaceutical, electronics, and automotive industries.

[0004] When measuring the thickness of plastic film during transportation, the conveyor line can be used to automatically detect the thickness of the film at different locations. However, during the film transportation process, it often needs to be positioned and clamped accordingly, and needs to remain in a relatively static state to facilitate the positioning and measurement of mechanical components. This consumes time and reduces work efficiency. Moreover, during the transportation operation, particles or flatness on the film may not meet the corresponding requirements, resulting in poor measurement accuracy, affecting the accuracy of the test data and reducing the stability of the instrument. Summary of the Invention

[0005] The purpose of the present invention is to provide an automated thickness gauge for plastic film and a thickness measurement method thereof, so as to solve the technical problems that it is necessary to position and clamp the film accordingly, maintain a corresponding static state, consume time and reduce work efficiency, and the particles or flatness on the film do not meet the corresponding requirements, resulting in poor measurement accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An automatic thickness gauge for plastic film, comprising:

[0008] A driving roller, a first guide wheel is provided between the driving roller and the conveying line, one end of the conveying line is connected to a winding roller along the film conveying direction, and the conveying line is installed on the frame and extends along a preset direction to carry and convey the film;

[0009] A first thickness measuring mechanism, comprising a bidirectional electric push rod placed on the side plates at both ends of the first guide wheel, wherein a push plate at one end of the bidirectional electric push rod and first sliders at both ends are connected by a first swinging rod, the first sliders are connected with a strip groove along the height direction of the fixed plate, and the first sliders are connected by a second guide wheel that is movably connected;

[0010] The first sliding block is connected to a marking rod via a bracket. The outside of the marking rod is provided with a scale placed on a support rod, and the scale is connected with scale lines adapted thereto.

[0011] Furthermore, the support rod is connected to the side plate and the frame of the conveyor line by locking and fixing with a positioning pin, the fixed plate is connected to the support rod by a positioning installation, both sides of the first swing rod are installed on the first slider and the push plate by a rotational connection, and the movable shaft on the second guide wheel and the center axis of the first pressure roller are connected by a conveyor belt transmission.

[0012] Furthermore, the first pressure roller is symmetrically arranged relative to the horizontal central axis of the film on the conveyor line, a guide cavity connected to the film is formed between the second guide wheels, and the outer wall edge of the central axis on the first pressure roller is provided with a rolling groove placed on the L-shaped baffle, the bottom of the L-shaped baffle is fixedly mounted on the support rod, and a limiting groove connected to the push plate on the bidirectional electric push rod is opened in the height direction of the L-shaped baffle.

[0013] Furthermore, the pushing plate on the other end of the bidirectional electric push rod is connected to the first gear plate through a bending rod near the driving roller side, and one end of the first gear plate is provided with a movable opening placed on a fixed frame, and the outer wall of the first gear plate is engaged with a first rotating tooth fixed on the first rotating shaft, and the first rotating shafts are connected through a cleaning roller that fits the film, and the outer wall of the cleaning roller is installed with bristles with an opening tilted outward by adhesive fixation.

[0014] Furthermore, it also includes a second thickness measuring mechanism, which includes a U-shaped plate placed on the conveyor line, a drive motor installed on the U-shaped plate, an output shaft of the drive motor passes through the U-shaped plate and the shell and extends to the second rotating shaft, the bottom of the second rotating shaft is connected to the steering rod through a cam, and a laser thickness gauge is detachably installed on the bottom of the steering rod, and both ends of the outer wall of the shell are fixedly connected to the U-shaped plate through cross beams.

[0015] Furthermore, both ends of the outer wall of the cam are movably in contact with the movable plate, the movable plate and the movable block are connected by a first spring, one end of the movable block and the inner wall of the shell are connected by a second spring, and a second gear plate is integrally installed on the bottom of the movable block, and the bottom of the second gear plate is transmission-engaged with a second rotating tooth fixed on the third rotating shaft, and a second swing rod is fixedly installed at both ends of the third rotating shaft, and the second swing rods are connected by a movably arranged second pressure roller.

[0016] Furthermore, a slot penetrating the interior of the shell is provided on the outer wall of the second swing arm, bearings are provided on the inner wall of the shell at both ends of the third rotating shaft, and an active cavity is formed inside the shell between the cam and the movable block. As the drive motor starts, the steering rod drives the laser thickness gauge to rotate and detect the thickness of the film. At the same time, the third rotating shaft drives the second pressure roller to swing back and forth and press against the film connected to the conveying roller.

[0017] An automatic thickness measurement method for a plastic film comprises the following steps:

[0018] S1.1. Start the drive roller and take-up roller, coordinate with the first guide wheel and conveyor line, and start conveying the film. The bidirectional electric push rod starts. Under the action of mechanical transmission, the second guide wheel moves to the center and completes the thickness detection work through the marking rod.

[0019] S1.2. In step S1.1, when the push plate at the other end of the bidirectional electric push rod moves back and forth, the cleaning roller swings back and forth under the action of the gear meshing transmission, thereby cleaning the particulate impurities on the film;

[0020] S1.3. The driving motor starts, the cam rotates, and the elastic restoring force of the spring causes the second pressure roller to swing back and forth to collide and press the film on the conveyor roller. At the same time, the laser thickness gauge performs rotational thickness measurement.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] (1) In the present invention, the drive roller, the conveying line, the first guide wheel and the winding roller are provided, which not only guide the film in conveying and prevent the film from being deviated from its position during the conveying process, but also facilitate the detection work of the first thickness measuring mechanism and the second thickness measuring mechanism during the conveying process, and have strong automation performance.

[0023] (2) In the present invention, after the bidirectional electric push rod of the first thickness measuring mechanism is started, it can drive the push plate to move outward. Under the rotation connection of the swing rod, the second guide wheels on the first sliders at both ends move in the center, so as to fit with the conveyed film. Moreover, the second guide wheel is movably connected to the first slider, so it can rotate freely during the contact and fitting movement and does not affect the conveying of the film. During the centering movement of the first slider, it can drive the synchronous movement of the marking rod on the scale. The height difference can be used to calculate the thickness of the film. At the same time, during the rotation of the second guide wheel, it can drive the synchronous rotation of the first pressure roller through the conveyor belt. The first pressure roller and the film The horizontal direction of conveying remains consistent, so that the first pressing roller not only has the function of pressing and flattening the film, but also can provide corresponding conveying power to ensure the stability of film conveying, and ensure the flatness of the film by rolling and pressing, thereby further improving the accuracy of thickness measurement data. In addition, during the horizontal reciprocating motion of the push plate at the other end of the bidirectional electric push rod, the cleaning roller on the first rotating shaft can be driven to swing back and forth under the action of gear meshing transmission. The swinging cleaning action can effectively remove foreign particles on the film, thereby avoiding the occurrence of particulate impurities affecting the accuracy of subsequent thickness measurement work, effectively improving the safety and reliability of the device.

[0024] (3) In the present invention, after the driving motor of the second thickness measuring mechanism is started, it can drive the cam on the first rotating shaft to rotate. Under the action of mechanical transmission, the laser thickness gauge on the steering rod can detect the thickness data of the film at multiple positions by rotating. During the rotation of the cam, the first spring and the second spring on the movable block can convert the rotational motion of the cam into the linear motion of the movable plate and the movable block. Moreover, the meshing transmission of the second gear plate and the second rotating tooth on the movable block can allow the second swing arm to perform a reciprocating rotation motion at a certain angle. During the rotation of the second swing arm, the flatness of the film conveying can be adjusted by the action of collision and pressing, and the winding work of the winding wheel can also be facilitated. Since the force of the collision and pressing is relatively large and the collision work is relatively smooth, the more wrinkled parts can be effectively flattened and pressed. The thickness measurement detection at multiple positions is realized by combining mechanical and electric measurement, which increases the diversity of data, facilitates personnel operation, and improves work efficiency.

[0025] (4) The entire plastic film detection method is simple to operate and has a high degree of integration. It can directly perform thickness detection while ensuring the normal conveying of the film, without affecting the conveying and winding of the film. It can also detect multiple positions, with a large range of detection data, high accuracy and automation, and can effectively ensure the flatness and cleanliness of the film during detection, thereby improving the quality of thickness measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of an automatic thickness gauge for plastic films of the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of an automatic thickness gauge for plastic films of the present invention. Figure 2 ;

[0029] Figure 3 It is a front view of an automatic thickness gauge for plastic films according to the present invention;

[0030] Figure 4 This invention Figure 1 A magnified view of point A;

[0031] Figure 5 This invention Figure 1 Enlarged view of point B;

[0032] Figure 6 Schematic diagram of the meshing transmission between the first gear plate and the first rotating tooth of the present invention;

[0033] Figure 7 is a schematic diagram of the interior of the housing of the present invention;

[0034] Figure 8 This invention Figure 7 Enlarged view of point C;

[0035] Figure 9 The present invention is a schematic flow chart of an automatic thickness measurement method for a plastic film.

[0036] Reference numerals: 1, driving roller; 2, conveyor line; 3, first guide wheel; 4, winding roller; 5, first thickness measuring mechanism; 6, bidirectional electric push rod; 7, pushing plate; 8, first slider; 9, first swinging rod; 10, fixing plate; 11, second guide wheel; 12, marking rod; 13, supporting rod; 14, scale; 15, scale line; 16, first pressure roller; 17, conveyor belt; 18, L-shaped baffle; 19, bending rod; 20, first gear plate; 21, fixing frame; 22, movable opening; 23. First rotating shaft; 24. First rotating tooth; 25. Cleaning roller; 26. Bristles; 27. Second thickness measuring mechanism; 28. U-shaped plate; 29. ​​Driving motor; 30. Housing; 31. Second rotating shaft; 32. Cam; 33. Steering rod; 34. Laser thickness gauge; 35. Moving plate; 36. Movable block; 37. First spring; 38. Second spring; 39. Second gear plate; 40. Third rotating shaft; 41. Second rotating tooth; 42. Second swinging rod; 43. Second pressure roller; 44. Notch. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0038] Reference Manual Figure 1 -Attached Figure 8 As shown, an automatic thickness gauge for plastic film, comprising:

[0039] A driving roller 1 is provided, and a first guide wheel 3 is provided between the driving roller 1 and the conveying line 2. A winding roller 4 is connected to one end of the conveying line 2 along the film conveying direction. The conveying line 2 is installed on the frame and extends along a preset direction to carry and convey the film;

[0040] The drive roller 1, the conveyor line 2, the first guide wheel 3 and the winding roller 4 are provided, which not only guides the film in conveying and prevents position deviation during the conveying process, but also facilitates the detection work of the first thickness measuring mechanism 5 and the second thickness measuring mechanism 27 during the conveying process, and has strong automation performance.

[0041] The first thickness measuring mechanism 5 includes a bidirectional electric push rod 6 placed on the side plates at both ends of the first guide wheel 3. The push plate 7 at one end of the bidirectional electric push rod 6 and the first sliders 8 at both ends are connected by a first swing rod 9. The first sliders 8 are connected with a strip groove along the height direction of the fixed plate 10, and the first sliders 8 are connected by a movably connected second guide wheel 11. A marking rod 12 is connected to the first slider 8 through a bracket. A scale 14 is provided on the outside of the marking rod 12 and is placed on a support rod 13. The scale line 15 adapted thereto is connected to the scale 14.

[0042] Specifically, the scale lines 15 on the scale 14 can record the height difference between the marking rods 12 at both ends. When the marking rod 12 is moving in the centering process, the second guide wheel 11 can be moved in the centering process, and the second guide wheel 11 can be in contact with the upper and lower ends of the film. Since the second guide wheel 11 can rotate freely, it can avoid affecting the normal transportation of the film. During the centering movement of the second guide wheel 11, the scale 14 and the scale lines 15 can record the corresponding displacement length. Through the above-mentioned difference calculation, the film thickness data is obtained, which effectively improves the accuracy of the data and can obtain the thickness values ​​of the film at different length positions.

[0043] The support rod 13 is connected to the side plate and the frame of the conveyor line 2 by locking and fixing with a locating pin, the fixed plate 10 is connected to the support rod 13 by a positioning installation, both sides of the first swing rod 9 are installed on the first slider 8 and the push plate 7 by a rotating connection, and the movable shaft on the second guide wheel 11 and the central axis of the first pressure roller 16 are connected by a conveyor belt 17.

[0044] Through the transmission action of the conveyor belt 17, the force generated when the second guide wheel 11 rotates can be transmitted to the first pressure roller 16. During the rotation of the first pressure roller 16, it can not only play the role of flattening and pressing the film during transportation, but also prevent the film from deviating from the corresponding position during transportation, thereby ensuring the stability of the device operation.

[0045] Specifically, the first pressure roller 16 is symmetrically arranged relative to the horizontal central axis of the film on the conveyor line 2, and a guide cavity connected to the film is formed between the second guide wheels 11. The outer wall edge of the central axis on the first pressure roller 16 is provided with a rolling groove placed on the L-shaped baffle 18. The bottom of the L-shaped baffle 18 is fixedly mounted on the support rod 13, and the height direction of the L-shaped baffle 18 is provided with a limiting groove connected to the push plate 7 on the bidirectional electric push rod 6. The push plate 7 on the other end of the bidirectional electric push rod 6 is connected to the first gear plate 20 through a bending rod 19 close to the driving roller 1. One end of the first gear plate 20 is provided with a movable opening 22 placed on the fixed frame 21, and the outer wall of the first gear plate 20 is meshed with a first rotating tooth 24 fixed on the first rotating shaft 23. The first rotating shafts 23 are connected by a cleaning roller 25 that fits the film, and the outer wall of the cleaning roller 25 is fixed with bristles 26 with an opening tilted outward by adhesive fixation.

[0046] After the bidirectional electric push rod 6 of the first thickness measuring mechanism 5 is started, it can drive the push plate 7 to move outward. Under the rotation connection of the swing rod, the second guide wheels 11 on the first sliders 8 at both ends move in alignment, so as to fit with the conveyed film. Moreover, the second guide wheel 11 is movably connected to the first slider 8. Therefore, it can rotate freely during the resistance and fitting movement and does not affect the conveying of the film. During the centering movement of the first slider 8, it can drive the synchronous movement of the marking rod 12 on the scale 14. The height difference can be used to calculate the thickness of the film. At the same time, during the rotation of the second guide wheel 11, the synchronous rotation of the first pressure roller 16 can be driven by the conveyor belt 17. The first pressure roller 16 It is consistent with the horizontal direction of film conveying, so that the first pressing roller 16 not only has the function of pressing and flattening the film, but also can provide corresponding conveying power to ensure the stability of film conveying, and ensure the flatness of the film by rolling and pressing, thereby further improving the accuracy of thickness measurement data. In addition, during the horizontal reciprocating motion of the push plate 7 at the other end of the bidirectional electric push rod 6, the cleaning roller 25 on the first rotating shaft 23 can be driven to swing back and forth under the action of gear meshing transmission. The swinging cleaning action can effectively remove foreign particles on the film, thereby avoiding the occurrence of particulate impurities affecting the accuracy of subsequent thickness measurement work, effectively improving the safety and reliability of the device.

[0047] An automated thickness gauge for plastic film also includes a second thickness measuring mechanism 27, which includes a U-shaped plate 28 placed on the conveyor line 2, and a drive motor 29 is installed on the U-shaped plate 28. The output shaft of the drive motor 29 passes through the U-shaped plate 28 and the shell 30 and extends to the second rotating shaft 31. The bottom of the second rotating shaft 31 is connected to the steering rod 33 through a cam 32. A laser thickness gauge 34 is detachably installed at the bottom of the steering rod 33. Both ends of the outer wall of the shell 30 are fixedly connected to the U-shaped plate 28 through cross beams.

[0048] Specifically, both ends of the outer wall of the cam 32 are movably in contact with the movable plate 35, the movable plate 35 and the movable block 36 are connected by a first spring 37, one end of the movable block 36 and the inner wall of the shell 30 are connected by a second spring 38, and a second gear plate 39 is integrally installed on the bottom of the movable block 36, and the bottom of the second gear plate 39 is transmission-engaged with a second rotating tooth 41 fixed on the third rotating shaft 40, and second swing rods 42 are fixedly installed at both ends of the third rotating shaft 40, and the second swing rods 42 are connected by a movably arranged second pressure roller 43.

[0049] A slot 44 is provided on the outer wall of the second swing arm 42 and passes through the interior of the shell 30. Bearings are provided on the inner wall of the shell 30 at both ends of the third rotating shaft 40. A movable cavity is formed inside the shell 30 between the cam 32 and the movable block 36. When the drive motor 29 is started, the steering rod 33 drives the laser thickness gauge 34 to rotate and detect the thickness of the film. At the same time, the third rotating shaft 40 drives the second pressure roller 43 to swing back and forth and press against the film connected to the conveyor roller.

[0050] After the drive motor 29 of the second thickness measuring mechanism 27 is started, it can drive the cam 32 on the second rotating shaft 31 to rotate. Under the action of mechanical transmission, the laser thickness gauge 34 on the steering rod 33 can detect the thickness data of the film at multiple positions by rotating. During the rotation of the cam 32, the first spring 37 and the second spring 38 on the movable block 36 can convert the rotational motion of the cam 32 into the linear motion of the movable plate 35 and the movable block 36. In addition, the meshing transmission of the second gear plate 39 and the second rotating tooth 41 on the movable block 36 allows the second swing arm 42 to perform a reciprocating rotational motion at a certain angle. During the rotation of the second swing arm 42, the flatness of the film conveying can be adjusted through the action of collision and pressing, which can also facilitate the winding work of the winding wheel. Since the force of the collision and pressing is relatively large and the collision work is relatively smooth, the more wrinkled parts can be effectively flattened and pressed. The thickness measurement detection at multiple positions is achieved by combining mechanical and electric measurement, which increases the diversity of data, facilitates human operation, and improves work efficiency.

[0051] refer to Figure 9 , an automatic thickness measurement method for a plastic film, comprising the following steps:

[0052] S1.1. Start the drive roller 1 and the winding roller 4, which cooperate with the first guide wheel 3 and the conveyor line 2 to start the film conveyance. The bidirectional electric push rod 6 is started. Under the action of mechanical transmission, the second guide wheel 11 moves to the center and completes the thickness detection work through the marking rod 12.

[0053] S1.2. In step S1.1, when the other end of the bidirectional electric push rod 6 pushes the plate 7 back and forth, the cleaning roller 25 swings back and forth under the action of the gear meshing transmission, thereby cleaning the particulate impurities on the film;

[0054] S1.3. The driving motor 29 is started, and the rotation of the cam 32, combined with the elastic restoring force of the spring, causes the second pressure roller 43 to swing back and forth to collide and press the film on the conveyor roller. At the same time, the laser thickness gauge 34 performs rotational thickness measurement.

[0055] The entire plastic film detection method is simple to operate and has a high degree of integration. It can directly perform thickness detection while ensuring the normal conveying of the film without affecting the conveying and winding of the film. It can also detect multiple position points, has a large detection data range, and has high accuracy and automation. It can effectively ensure the flatness and cleanliness of the film during detection, thereby improving the quality of thickness measurement.

[0056] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

[0057] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic thickness gauge for plastic film, characterized in that: include: A driving roller (1), a first guide wheel (3) is provided between the driving roller (1) and the conveying line (2), one end of the conveying line (2) is connected to a winding roller (4) along the film conveying direction, and the conveying line (2) is installed on a frame and extends along a preset direction for carrying and conveying the film; A first thickness measuring mechanism (5), the first thickness measuring mechanism (5) comprises a bidirectional electric push rod (6) placed on the side plates at both ends of the first guide wheel (3), a push plate (7) at one end of the bidirectional electric push rod (6) and first sliders (8) at both ends are connected via a first swing rod (9), the first sliders (8) are connected with a strip groove along the height direction of the fixed plate (10), and the first sliders (8) are connected via a second guide wheel (11) that is movably connected; The first slider (8) is connected to a marking rod (12) via a bracket, and a scale (14) is provided on the outside of the marking rod (12) and is placed on a support rod (13), and a scale line (15) adapted thereto is connected to the scale (14); The support rod (13) is connected to the side plate and the frame of the conveyor line (2) by means of a locking and fixing method using a positioning pin, the fixed plate (10) is connected to the support rod (13) by means of a positioning installation method, both sides of the first swing rod (9) are installed on the first slider (8) and the push plate (7) by means of a rotational connection, and the movable shaft on the second guide wheel (11) and the central axis of the first pressure roller (16) are connected by a transmission through a conveyor belt (17); The pushing plate (7) on the other end of the bidirectional electric push rod (6) is connected to a first gear plate (20) via a bending rod (19) near the driving roller (1). One end of the first gear plate (20) is provided with a movable opening (22) placed on a fixing frame (21), and the outer wall of the first gear plate (20) is meshed with a first rotating tooth (24) fixed on a first rotating shaft (23). The first rotating shafts (23) are connected via a cleaning roller (25) that is in contact with the film. The outer wall of the cleaning roller (25) is fixed with bristles (26) with an opening tilted outward by adhesive.

2. The automatic thickness gauge for plastic film according to claim 1, characterized in that: The first pressing roller (16) is symmetrically arranged relative to the horizontal central axis of the film on the conveyor line (2), and a guide cavity connected to the film is formed between the second guide wheels (11). The outer wall edge of the central axis on the first pressing roller (16) is provided with a rolling groove placed on the L-shaped baffle (18), the bottom of the L-shaped baffle (18) is fixedly installed on the support rod (13), and a limiting groove connected to the push plate (7) on the bidirectional electric push rod (6) is opened in the height direction of the L-shaped baffle (18).

3. The automatic thickness gauge of a plastic film according to claim 1, characterized in that: The invention also includes a second thickness measuring mechanism (27), which includes a U-shaped plate (28) placed on the conveyor line (2), a driving motor (29) installed on the U-shaped plate (28), an output shaft of the driving motor (29) passing through the U-shaped plate (28) and the housing (30) and extending to the second rotating shaft (31), the bottom of the second rotating shaft (31) is connected to the steering rod (33) through a cam (32), and a laser thickness gauge (34) is detachably installed on the bottom of the steering rod (33), and both ends of the outer wall of the housing (30) are fixedly connected to the U-shaped plate (28) through a crossbeam.

4. The automatic thickness gauge for plastic film according to claim 3, characterized in that: Both ends of the outer wall of the cam (32) are movably abutted against the movable plate (35), the movable plate (35) and the movable block (36) are connected via a first spring (37), one end of the movable block (36) and the inner wall of the housing (30) are connected via a second spring (38), and a second gear plate (39) is integrally formed and installed at the bottom of the movable block (36), the bottom of the second gear plate (39) is transmission-engaged with a second rotating tooth (41) fixed on the third rotating shaft (40), and second swinging rods (42) are fixedly installed at both ends of the third rotating shaft (40), and the second swinging rods (42) are connected via a movably arranged second pressure roller (43).

5. The automatic thickness gauge for plastic film according to claim 4, characterized in that: The outer wall of the second swinging rod (42) is provided with a notch (44) penetrating the interior of the shell (30), and both ends of the third rotating shaft (40) are provided with bearings placed on the inner wall of the shell (30). A movable cavity placed inside the shell (30) is formed between the cam (32) and the movable block (36). When the driving motor (29) is started, the steering rod (33) drives the laser thickness gauge (34) to rotate and detect the thickness of the film. At the same time, the third rotating shaft (40) drives the second pressing roller (43) to swing back and forth and press against the film connected to the conveying roller.

6. An automated thickness measurement method for plastic film, applied to an automated thickness gauge for plastic film according to any one of claims 1 to 5, characterized in that: The steps include: S1.

1. Start the driving roller (1) and the winding roller (4), cooperate with the first guide wheel (3) and the conveyor line (2), so that the film starts to be conveyed, the bidirectional electric push rod (6) is started, and under the action of mechanical transmission, the second guide wheel (11) moves to the center and completes the thickness detection work through the marking rod (12); S1.2, in step S1.1, when the other end of the bidirectional electric push rod (6) pushes the plate (7) back and forth, the cleaning roller (25) swings back and forth under the action of the gear meshing transmission, thereby cleaning the particle impurities on the film; S1.3, the driving motor (29) is started, the cam (32) rotates, and the elastic restoring force of the spring is coordinated, and the second pressing roller (43) swings back and forth to collide and press the film on the conveying roller, and at the same time, the laser thickness gauge (34) performs the rotation thickness measurement.

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