An anti-puncture polyethylene composite film production device

Abstract

The application belongs to the technical field of polyethylene film production equipment, and discloses an anti-puncture polyethylene composite film production device, which comprises a machine cover and a plurality of guide rollers installed in the machine cover and used for guiding the wire. The device has the following effects: when the film is normally transmitted, the self-tension drives the non-return cam No. 2 to rotate, the coil spring is automatically tightened and stored with energy, after the film is broken, the coil spring instantaneously releases energy, drives the non-return cam No. 2 to close and clamp the non-return cam No. 1, quickly fixes the broken end, avoids the film from being wound around the winding roller or the transmission component due to inertia, reduces the equipment jamming failure, the detachable counterweight can slightly adjust the tension pressure, and is suitable for the high-end film tension precision requirement. The multiple adjustment modes break the traditional single tension control limitation, are flexibly suitable for the production of the ultra-thin, thickened and multi-material composite anti-puncture polyethylene composite film, and improve the application range of the device.

Description

Technical Field

[0001] This utility model relates to the technical field of polyethylene film production equipment, and in particular to a puncture-resistant polyethylene composite film production device. Background Technology

[0002] Polyethylene film is widely used in packaging, agricultural covering, and industrial protection due to its good flexibility, corrosion resistance, and cost advantages. However, ordinary polyethylene film has poor puncture resistance and is easily damaged by external force during transportation, storage, or use, affecting its performance and service life. To improve the puncture resistance of polyethylene film, the industry usually adopts a composite process to combine polyethylene substrate with puncture-resistant functional layers (such as modified polyethylene, nylon film, etc.) to form puncture-resistant polyethylene composite film.

[0003] The winding process is the final step in forming rolled products, and the accuracy of winding tension control directly affects the integrity of the finished roll. Excessive tension will cause the material to continuously bear tensile force beyond its tolerance range, which can easily lead to material breakage. If the broken material is not dealt with in time, it can easily get tangled on the winding roller or peripheral transmission components, which may cause equipment jamming, component wear, and increase equipment maintenance costs and failure risks. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a puncture-resistant polyethylene composite film production device. Through an emergency clamping mechanism comprised of a return cam, a check cam, and a coil spring, the film's own tension drives the check cam to rotate during normal transport, causing the coil spring to automatically tighten and store energy. Upon film breakage, the coil spring instantly releases energy, causing the check cam to engage with the check cam and quickly secure the broken end. This prevents the film from becoming entangled in the winding roller or transmission components due to inertia, reducing equipment jamming. A detachable counterweight allows for fine-tuning of the tension pressure, adapting to the high-precision tension requirements of advanced films. Multiple adjustment methods break through the limitations of traditional single tension control, flexibly adapting to the production of ultra-thin, thickened, and multi-material composite puncture-resistant polyethylene composite films, thus expanding the device's applicability.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a puncture-resistant polyethylene composite film production device, including a machine cover and multiple sets of guide rollers installed inside the machine cover for guiding the filaments;

[0006] Inside the machine cover are two fixed shafts: a first fixed shaft and a second fixed shaft. A first check cam is symmetrically mounted on the surface of the first fixed shaft, and a second check cam is symmetrically mounted on the surface of the second fixed shaft. The second check cam is rotatably connected to the surface of the second fixed shaft. A coil spring is mounted on the surface of the second check cam, and the other end of the coil spring is fixedly mounted on the surface of the second fixed shaft. Rotary guide rollers are rotatably connected to the surfaces of the two second check cams to guide the polyethylene composite film against puncture.

[0007] By adopting the above technical solution, check cam one is mounted on fixed shaft one, and check cam two is rotatably connected to fixed shaft two. The two are adapted to form a clamping structure, laying the foundation for rapid clamping when the film breaks. Moreover, check cam two can be dynamically adjusted with the film tension to avoid uneven force caused by rigid connection. The rotating guide roller is connected to the two check cams two, and the rolling friction reduces film wear and deformation, ensuring product quality. At the same time, it can accurately transmit film tension, drive check cam two to rotate, and make the coil spring stably store energy, providing reliable power for clamping when broken.

[0008] Furthermore, during the puncture-resistant polyethylene composite film winding process, the film is mounted on the surface of the rotating guide roller and under the action of tension, it causes the second anti-return cam to rotate on the second fixed shaft while the coil spring is in a tightened and energy-storing state. When the film breaks, the tension disappears, and the coil spring that is in the winding and energy-storing state causes the corresponding second anti-return cam to rotate to the side of the first anti-return cam, thus clamping the broken film to prevent entanglement.

[0009] By adopting the above technical solution, when the polyethylene composite film is punctured and wound up, its own tension drives the second anti-return cam to rotate on the second fixed shaft, so that the coil spring is tightened and stores elastic potential energy. After the film breaks, the tension disappears, the coil spring immediately releases energy, drives the second anti-return cam to rotate towards the first anti-return cam and clamps it, quickly fixing the broken end and preventing the film from continuing to move and wrap around the winding roller or transmission components due to inertia.

[0010] Furthermore, an arc-shaped pressure plate is installed between the two anti-return cams, and the surface of the arc-shaped pressure plate is provided with an anti-slip pad.

[0011] By adopting the above technical solution, the anti-slip pads on the surface of the arc-shaped pressure plate can increase the friction with the film surface, prevent the film end from sliding due to residual tension or external force during the clamping process, and ensure that the broken end is always in a stable clamping state.

[0012] Furthermore, an L-shaped fixing plate is fixedly installed on one side of the second check cam, and a pawl is rotatably connected to the surface of the L-shaped fixing plate. A ratchet is fixedly installed at the end of the rotating guide roller through the end of the second check cam, and the pawl abuts against the surface of the ratchet.

[0013] By adopting the above technical solution, the pawl is rotatably connected to the surface of the L-shaped fixed plate and abuts against the surface of the ratchet. The ratchet is fixed to the end of the roller shaft of the rotating guide roller. The two form a one-way check structure, which can prevent the broken film from rotating in the opposite direction when it loosens.

[0014] Furthermore, one side of the pawl abuts against a spring, and the other end of the spring is fixed to one side surface of the L-shaped fixing plate.

[0015] By adopting the above technical solution, one end of the spring abuts against the pawl and the other end is fixed to the surface of the L-shaped fixed plate. It can continuously apply pressure to the pawl through its own elastic potential energy, ensuring that the pawl is always in close contact with the ratchet surface, and avoiding gaps between the pawl and the ratchet due to equipment vibration and long-term use.

[0016] Furthermore, a U-shaped frame is provided inside the machine cover, and a carriage is slidably connected to the bottom of the U-shaped frame. A tensioning roller for tensioning the film is installed between the two carriages. A T-shaped slide rod is slidably connected in a blind hole opened on the surface of the carriage. The other end of the T-shaped slide rod is installed at the bottom of the U-shaped frame, and a spring is sleeved on the outer surface of the T-shaped slide rod between the U-shaped frame and the carriage.

[0017] By adopting the above technical solution, the carriage is slidably connected to the bottom of the U-shaped frame, which can drive the tension roller to move flexibly with the film tension. The T-shaped slide bar limits the sliding direction of the carriage on the one hand to prevent the tension roller from being misaligned, and on the other hand, it provides installation support for the second spring. The second spring tension compensation sleeve is placed outside the T-shaped slide bar, and quickly compensates for small tension fluctuations of the film through elastic deformation. When the tension is large, the compression is relieved, and when the tension is small, the rebound is increased.

[0018] Furthermore, a hydraulic rod is installed on the surface of the machine cover, a lifting plate is installed on the piston end of the hydraulic rod, a connecting frame is slidably connected to the surface of the machine cover, the lifting plate is directly below the connecting frame, the connecting frame is slidably connected inside the machine cover, and one end of the connecting frame extending into the machine cover is connected to the U-shaped frame.

[0019] By adopting the above technical solution, when the winding is completed, the hydraulic rod installed on the surface of the machine cover is activated. The piston end of the hydraulic rod pushes the lifting plate to rise. The lifting plate acts on the connecting frame directly above, causing the connecting frame to slide along the surface of the machine cover and drive the U-shaped frame to rise and fall as a whole. At the same time, the guide slide plate fixed on one side of the U-shaped frame will slide along the groove on the surface of the machine cover to ensure that the U-shaped frame rises and falls smoothly, and cause the tension roller to lift off the surface of the film.

[0020] Furthermore, a guide slide is fixedly installed on one side of the U-shaped frame. The guide slide is slidably connected to a groove opened on the surface of the machine cover, and a counterweight is detachably installed on one end of the guide slide that extends out of the machine cover.

[0021] By adopting the above technical solution, a counterweight can be detachably installed at one end of the guide slide extending out of the machine cover. Operators can increase or decrease the weight of the counterweight. At the same time, the detachable design of the counterweight makes it easy to flexibly change different weight specifications according to production needs, thereby improving the flexibility of the device.

[0022] In summary, this utility model has the following beneficial effects:

[0023] The device uses an emergency clamping mechanism constructed by check cam one, check cam two and spring. During normal film transport, the tension of the check cam two drives the film to rotate, causing the spring to automatically tighten and store energy. Once the film breaks, the spring releases its potential energy instantly, driving check cam two to clamp the film against check cam one, quickly fixing the broken end. This effectively prevents the film from continuing to move due to inertia and getting tangled in the take-up roller or transmission components, reducing equipment jamming failures.

[0024] Spring 2 can compensate for small tension fluctuations in the film in real time through elastic deformation, avoiding breakage or wrinkling caused by abnormal tension. The detachable counterweight can finely adjust the tension pressure, adapting to the stringent requirements of high-end films for tension accuracy. With multiple adjustment methods, it breaks through the limitations of traditional single tension control and can be flexibly adapted to the production of ultra-thin, thickened and multi-material composite puncture-resistant polyethylene films, expanding the applicability of the device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a partial structural diagram of the interior of the casing of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the arc-shaped pressure plate and the anti-return cam of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the coil spring and the second anti-return cam of this utility model;

[0029] Figure 5 This is a schematic diagram of the ratchet and pawl of this utility model;

[0030] Figure 6 This is a structural schematic diagram of the tension wheel, counterweight, and U-shaped frame of this utility model;

[0031] Figure 7 This is a structural schematic diagram of the spring 2, T-shaped slide bar and slide frame of this utility model.

[0032] In the diagram: 1. Machine cover; 2. Guide roller; 3. Fixed shaft rod one; 4. Fixed shaft rod two; 5. Check cam one; 6. Arc-shaped pressure plate; 7. Rotating guide roller; 8. Coil spring; 9. L-shaped fixed plate; 10. Pawl; 11. Ratchet; 12. Spring one; 13. Hydraulic rod; 14. Connecting frame; 15. Lifting plate; 16. Guide slide plate; 17. U-shaped frame; 18. Tensioning roller; 19. Slide frame; 20. T-shaped slide rod; 21. Spring two; 25. Counterweight; 27. Check cam two. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] like Figure 1-7 As shown in the figure, this application discloses a puncture-resistant polyethylene composite film production apparatus, including a machine cover 1 and multiple sets of guide rollers 2 installed inside the machine cover 1 for guiding the filaments;

[0035] Inside the machine cover 1, there are two fixed shafts: a first fixed shaft 3 and a second fixed shaft 4. A first check cam 5 is symmetrically mounted on the surface of the first fixed shaft 3, and a second check cam 27 is symmetrically mounted on the surface of the second fixed shaft 4. The second check cam 27 is rotatably connected to the surface of the second fixed shaft 4. A coil spring 8 is mounted on the surface of the second check cam 27, and the other end of the coil spring 8 is fixedly mounted on the surface of the second fixed shaft 4. Rotary guide rollers 7 are rotatably connected to the surfaces of the two second check cams 27 to guide the polyethylene composite film against puncture.

[0036] Fixed shaft 1 (3) and fixed shaft 2 (4) are fixedly installed inside the machine cover 1, providing stable support for subsequent components such as check cam 1 (5) and check cam 2 (27) rotating guide roller 7, ensuring that no displacement occurs during long-term operation and guaranteeing the overall structural stability of the device. Check cam 1 (5) is symmetrically installed on the surface of fixed shaft 1 (3), and check cam 2 (27) is rotatably connected to the surface of fixed shaft 2 (4). The two form a matching clamping structure, laying the foundation for rapid clamping when the film breaks. At the same time, the rotational characteristics of check cam 2 (27) can be dynamically adjusted in accordance with changes in film tension, avoiding uneven stress on the film caused by rigid connection. The rotating guide roller 7 is rotatably connected to the surfaces of the two check cams 2 (27). On the one hand, it can reduce the frictional resistance with the film through its own rotation, avoiding tensile deformation of the film surface due to friction. On the other hand, it can accurately support the film and transmit tension, providing stable power for the energy storage of the coil spring 8.

[0037] Furthermore, during the puncture-resistant polyethylene composite film winding process, the film is mounted on the surface of the rotating guide roller 7 and under the action of tension, it causes the second check cam 27 to rotate on the fixed shaft 4 while the coil spring 8 is in a tightened and energy-storing state. When the film breaks, the tension disappears, and the coil spring 8, which is in the energy-storing state, causes the corresponding second check cam 27 to rotate to the side of the first check cam 5, thus clamping the broken film to prevent entanglement.

[0038] During the winding and forming process of puncture-resistant polyethylene composite film, the tension of the film itself is used to cause the second check cam 27 to rotate on the fixed shaft 2 4, thereby causing the coil spring 8 to tighten and store energy. When the film breaks, the tension disappears instantly, and the coil spring 8 can immediately release the stored elastic potential energy, driving the second check cam 27 to rotate towards the first check cam 5 and achieve clamping. This can quickly fix the broken film end, prevent the film from continuing to move towards the winding end under inertia, effectively avoid the broken film from getting tangled on the winding roller or peripheral transmission components, reduce equipment jamming failures, and lower equipment maintenance costs.

[0039] Furthermore, an arc-shaped pressure plate 6 is installed between the two check cams 5, and the surface of the arc-shaped pressure plate 6 is provided with an anti-slip pad.

[0040] The anti-slip pads on the surface of the arc-shaped pressure plate 6 increase the friction with the film surface, preventing the film end from sliding due to residual tension or external force during clamping, and ensuring that the broken end is always in a stable clamping state.

[0041] Furthermore, an L-shaped fixing plate 9 is fixedly installed on one side of the check cam 27, and a pawl 10 is rotatably connected to the surface of the L-shaped fixing plate 9. The roller shaft of the rotating guide roller 7 passes through the end of the check cam 27 and a ratchet 11 is fixedly installed thereon, with the pawl 10 abutting against the surface of the ratchet 11.

[0042] The pawl 10 is rotatably connected to the surface of the L-shaped fixed plate 9 and abuts against the surface of the ratchet 11. The ratchet 11 is fixed to the end of the roller shaft of the rotating guide roller 7. The two form a one-way check structure, which can prevent reverse rotation when the broken film loosens.

[0043] Furthermore, one side of the pawl 10 abuts against a spring 12, and the other end of the spring 12 is fixed to one side surface of the L-shaped fixing plate 9.

[0044] One end of the spring 12 abuts against the pawl 10 and the other end is fixed to the surface of the L-shaped fixed plate 9. It can continuously apply pressure to the pawl 10 through its own elastic potential energy to ensure that the pawl 10 always tightly abuts against the surface of the ratchet 11, and avoid gaps between the pawl 10 and the ratchet 11 due to equipment vibration and long-term use.

[0045] Furthermore, a U-shaped frame 17 is provided inside the machine cover 1. A carriage 19 is slidably connected to the bottom of the U-shaped frame 17. A tensioning roller 18 for tensioning the film is installed between the two carriages 19. A T-shaped slide rod 20 is slidably connected in a blind hole opened on the surface of the carriage 19. The other end of the T-shaped slide rod 20 is installed at the bottom of the U-shaped frame 17. A spring 21 is sleeved on the outer surface of the T-shaped slide rod 20 between the U-shaped frame 17 and the carriage 19.

[0046] The carriage 19 is slidably connected to the bottom of the U-shaped frame 17, which can drive the tension roller 18 to move flexibly with the change of film tension. The T-shaped slide bar 20 limits the sliding direction of the carriage 19 on the one hand to prevent the carriage 19 from deviating and causing the tension roller 18 to be misaligned, and on the other hand, it provides installation support for the second spring 21. The second spring 21 is sleeved on the outer surface of the T-shaped slide bar 20 and located between the U-shaped frame 17 and the carriage 19. It can quickly compensate for small tension fluctuations of the film through its own elastic deformation. When the tension is too large, the compression is relieved and when the tension is too small, the rebound is increased.

[0047] Furthermore, a hydraulic rod 13 is installed on the surface of the cover 1, and a lifting plate 15 is installed on the piston end of the hydraulic rod 13. A connecting frame 14 is slidably connected to the surface of the cover 1. The lifting plate 15 is located directly below the connecting frame 14. The connecting frame 14 is slidably connected inside the cover 1, and one end of the connecting frame 14 extending into the cover 1 is connected to the U-shaped frame 17.

[0048] When winding is completed, the hydraulic rod 13 installed on the surface of the machine cover 1 is activated. The piston end of the hydraulic rod 13 pushes the lifting plate 15 to rise. The lifting plate 15 acts on the connecting frame 14 directly above, causing the connecting frame 14 to slide along the surface of the machine cover 1 and drive the U-shaped frame 17 to rise and fall as a whole. At the same time, the guide slide plate 16 fixed on one side of the U-shaped frame 17 will slide along the groove on the surface of the machine cover 1 to ensure that the U-shaped frame 17 rises and falls smoothly, causing the tension roller 18 to lift off the surface of the film.

[0049] Furthermore, a guide slide plate 16 is fixedly installed on one side of the U-shaped frame 17. The guide slide plate 16 is slidably connected in the groove opened on the surface of the cover 1, and a counterweight block 25 is detachably installed on one end of the guide slide plate 16 extending out of the cover 1.

[0050] The guide slide plate 16 extends out of the machine cover 1 and a counterweight 25 can be detachably installed. The operator can increase or decrease the weight of the counterweight 25. At the same time, the detachable design of the counterweight 25 makes it easy to flexibly change different weight specifications according to production needs, thus improving the flexibility of the device.

[0051] The working principle of this utility model is as follows: The puncture-resistant polyethylene composite film first enters the machine housing 1 and is initially guided by multiple sets of guide rollers 2. The guide rollers 2 can prevent the film from rubbing against the inner wall of the machine housing 1 in the early stage of transmission, ensuring the integrity of the film surface. At the same time, the film will be accurately mounted on the surface of the rotating guide roller 7. The rotating guide roller 7 is the core guiding component, and its two ends are rotatably connected to the surface of the second check cam 27. The second check cam 27 is symmetrically arranged on the surface of the second fixed shaft 4. The second fixed shaft 4 and the first fixed shaft 3 together provide stable support for the guiding structure, ensuring that the rotating guide roller 7 is always on the preset path of film transmission, laying the foundation for subsequent tension adjustment and anti-breakage mechanism activation.

[0052] Tensioning rollers 18 are installed between the slides 19 that are slidably connected to the bottom of the U-shaped frame 17. The tensioning rollers 18 are in contact with the film surface and form a continuous tension force on the film. When the film tension fluctuates slightly, the slides 19 will slide along the bottom of the U-shaped frame 17. At this time, the spring 21, which is sleeved on the outer surface of the T-shaped slide bar 20, is located between the U-shaped frame 17 and the slides 19 and will compensate for the tension change in real time through its own elastic deformation. If the film tension is too large, the spring 21 is compressed and the slides 19 drive the tensioning rollers 18 to move away from the film to relieve the tension. If the film tension is too small, the spring 21 rebounds and pushes the tensioning rollers 18 closer to the film to increase the tension force and achieve preliminary tension balance.

[0053] If significant tension adjustments are required based on changes in film thickness and material, a counterweight 25 can be detachably installed at one end of the guide slide plate 16 extending out of the machine cover 1. By increasing or decreasing the weight of the counterweight 25, the pressure of the U-shaped frame 17 and tension roller 18 on the film can be adjusted, further optimizing the tension parameters and adapting to the production needs of different thicknesses, such as ultra-thin and thickened puncture-resistant polyethylene composite films.

[0054] When the film breaks due to abnormal winding tension, material defects, or other reasons, the tension of the film on the rotating guide roller 7 disappears instantly. At this moment, the coil spring 8, which stores elastic potential energy, quickly rebounds, driving the second check cam 27 to rotate towards the check cam 5 on the surface of the fixed shaft 3. The contours of the check cam 5 and the second check cam 27 are adapted to each other, and during rotation, they quickly engage. At the same time, the arc-shaped pressure plate 6 installed between the two check cams 25 has anti-slip pads on its surface, which, together with the second check cam 27, form a clamping space to firmly fix the broken film end and prevent further breakage. Under inertia, the film continues to move toward the winding end, thereby preventing the film from getting tangled on the winding roller or peripheral transmission components, reducing the risk of equipment jamming, and giving workers time to connect the film ends. At the same time, the film will generate a continuous pulling force on the rotating guide roller 7 under tension, causing the rotating guide roller 7 to drive the second check cam 27 to rotate slowly on the fixed shaft 2 4. Meanwhile, the ratchet 11 and pawl 10 provided together can prevent the rotating guide roller 7 from rotating in the opposite direction, ensuring that the broken film can be clamped and fixed by the arc-shaped pressure plate 6 installed between the two check cams 1 5 and the second check cam 27.

[0055] When winding is completed, the hydraulic rod 13 installed on the surface of the machine cover 1 is activated. The piston end of the hydraulic rod 13 pushes the lifting plate 15 to rise. The lifting plate 15 acts on the connecting frame 14 directly above, causing the connecting frame 14 to slide along the surface of the machine cover 1 and drive the U-shaped frame 17 to rise and fall as a whole. At the same time, the guide slide plate 16 fixed on one side of the U-shaped frame 17 will slide along the groove on the surface of the machine cover 1 to ensure that the U-shaped frame 17 rises and falls smoothly, causing the tension roller 18 to lift off the surface of the film.

[0056] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A puncture-resistant polyethylene composite film production apparatus, comprising a hood (1) and multiple sets of guide rollers (2) installed inside the hood (1) for guiding the filaments. Its characteristics are: Inside the housing (1), a fixed shaft rod one (3) and a fixed shaft rod two (4) are installed. A check cam one (5) is symmetrically installed on the surface of the fixed shaft rod one (3). A check cam two (27) is symmetrically arranged on the surface of the fixed shaft rod two (4). The check cam two (27) is rotatably connected to the surface of the fixed shaft rod two (4). A coil spring (8) is installed on the surface of the check cam two (27). The other end of the coil spring (8) is fixedly installed on the surface of the fixed shaft rod two (4). Rotary guide rollers (7) are rotatably connected to the surfaces of the two check cam two (27) for guiding the polyethylene composite film against puncture.

2. The puncture-resistant polyethylene composite film production apparatus according to claim 1, characterized in that: During the puncture-resistant polyethylene composite film winding process, the film is mounted on the surface of the rotating guide roller (7) and under the action of tension, the second anti-return cam (27) rotates on the fixed shaft rod (4) while the coil spring (8) is in a tightened and energy-storing state. When the film breaks, the tension disappears, and the coil spring (8) that is winding and storing energy causes the corresponding second anti-return cam (27) to rotate to the side of the first anti-return cam (5) to clamp the broken film and prevent entanglement.

3. The puncture-resistant polyethylene composite film production apparatus according to claim 1, characterized in that: An arc-shaped pressure plate (6) is installed between the two anti-return cams (5), and the surface of the arc-shaped pressure plate (6) is provided with an anti-slip pad.

4. The puncture-resistant polyethylene composite film production apparatus according to claim 1, characterized in that: An L-shaped fixing plate (9) is fixedly installed on one side of the second check cam (27). A pawl (10) is rotatably connected to the surface of the L-shaped fixing plate (9). A ratchet (11) is fixedly installed at the end of the rotating guide roller (7) through the end of the second check cam (27). The pawl (10) abuts against the surface of the ratchet (11).

5. The puncture-resistant polyethylene composite film production apparatus according to claim 4, characterized in that: One side of the pawl (10) abuts against a spring (12), and the other end of the spring (12) is fixed to one side surface of the L-shaped fixing plate (9).

6. The puncture-resistant polyethylene composite film production apparatus according to claim 1, characterized in that: A U-shaped frame (17) is provided inside the machine cover (1). A slide (19) is slidably connected to the bottom of the U-shaped frame (17). A tensioning roller (18) for tensioning the film is installed between the two slides (19). A T-shaped slide rod (20) is slidably connected in a blind hole opened on the surface of the slide (19). The other end of the T-shaped slide rod (20) is installed at the bottom of the U-shaped frame (17). A spring (21) is sleeved on the outer surface of the T-shaped slide rod (20) and located between the U-shaped frame (17) and the slide (19).

7. The puncture-resistant polyethylene composite film production apparatus according to claim 6, characterized in that: A hydraulic rod (13) is installed on the surface of the machine cover (1). A lifting plate (15) is installed on the piston end of the hydraulic rod (13). A connecting frame (14) is slidably connected to the surface of the machine cover (1). The lifting plate (15) is located directly below the connecting frame (14). The connecting frame (14) is slidably connected inside the machine cover (1), and one end of the connecting frame (14) extending into the machine cover (1) is connected to the U-shaped frame (17).

8. The puncture-resistant polyethylene composite film production apparatus according to claim 7, characterized in that: A guide plate (16) is fixedly installed on one side of the U-shaped frame (17). The guide plate (16) is slidably connected in the groove opened on the surface of the cover (1), and a counterweight (25) is detachably installed on one end of the guide plate (1) extending out of the cover (1).

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