Anti-wrinkle film blowing machine traction and winding device

Abstract

This invention relates to the field of blown film technology and discloses an anti-wrinkle blown film machine traction and winding device, including a bottom frame sleeved on the outside of the blown film machine, a traction mechanism, and a winding mechanism. The traction mechanism is located directly above the blown film machine and is used to pull the film out of the blown film machine and flatten it. The winding mechanism is located on the side of the bottom frame away from the traction mechanism and includes a back plate fixedly connected to both sides of the bottom frame. The ends of the two back plates are rotatably connected to the two ends of a drive roller. A winding roller assembly for winding the film is placed on the drive roller. A rotating seat is rotatably connected to the side of the back plate away from the center of the bottom frame. Multiple material feeding plates are distributed around the outer circumference of the rotating seat. This invention eliminates the production interruption caused by machine stoppage and roll changing, as well as the severe fluctuation of film bubble tension caused by the mismatch between traction speed and extrusion speed during start-up and shutdown, by using the rotating seat to drive the circumferentially distributed material feeding plates and the arc-shaped material storage plate in coordination.

Description

Technical Field

[0001] This invention relates to the field of blown film technology, specifically to a wrinkle-resistant blown film machine traction and winding device. Background Technology

[0002] In the field of blown film production, the traction and winding device is the core equipment in the later stages of film forming. Its function is to receive the cooled and shaped tubular film bubble and sequentially complete the processes of flattening and guiding the film bubble, continuous traction conveying, and constant tension winding into a roll. In existing technology, the traction unit usually consists of one or more pairs of traction rollers arranged opposite each other. After the film bubble is flattened by a herringbone plate or clamping plate mechanism, it is clamped by the traction rollers and continuously conveyed upward or downward to the winding unit. The winding unit mostly adopts a single-station winding structure. The winding shaft is driven by a winding motor to rotate, winding the film onto a paper core or plastic core roll. Some equipment is equipped with tension detection and feedback adjustment mechanisms, such as floating rollers and tension sensors, to achieve basic control of the film tension during the winding process and avoid the film from becoming loose or overstretched during winding. In addition, to accommodate different film widths, flattening rollers or bow rollers are usually set before winding to help eliminate local creases on the film surface. This type of traction and winding device is widely used in small and medium-sized blown film units. Its structure is relatively simple and its manufacturing and maintenance costs are low.

[0003] However, the existing traction and winding devices described above still have significant shortcomings in practical use. The winding unit uses a single-station structure. When a roll of film is wound to a preset length or diameter, the operator must manually stop the machine, remove the fully wound roller from the winding shaft, install a new empty roll, and then restart the equipment to resume production. This process not only forces the entire blown film production line to stop, reducing continuous production efficiency, but also causes a momentary mismatch between traction speed and extrusion speed due to frequent start-ups and shutdowns, resulting in severe fluctuations in film bubble tension. Consequently, the initial section of film is prone to transverse or longitudinal wrinkles after restarting, affecting the yield. Therefore, a new type of traction and winding device is urgently needed that can achieve roll changing without stopping the machine and effectively suppress film wrinkling. Summary of the Invention

[0004] The purpose of this invention is to provide a wrinkle-resistant blown film machine traction and winding device to solve the technical problem of needing to stop the machine to replace the winding roller in the prior art.

[0005] A wrinkle-resistant blown film machine traction and rewinding device includes a bottom frame fitted outside the blown film machine, and also includes a traction mechanism and a rewinding mechanism. The traction mechanism, located directly above the blown film machine, is used to pull the film out of the blown film machine and flatten it; The winding mechanism is located on the side of the bottom frame away from the traction mechanism. It includes a back plate that is fixedly connected to both sides of the bottom frame. The ends of the two back plates are rotatably connected to the two ends of the drive roller. A winding roller assembly for winding film is placed on the drive roller. A rotating seat is rotatably connected to the side of the back plate away from the center of the bottom frame. Multiple material-pushing plates are distributed around the outer circumference of the rotating seat. The material-pushing plates are triangular structures with a raised center. A storage groove for placing the winding roller assembly is opened in the raised center. When the material-pushing plate rotates to face the traction mechanism, there is a gap between the winding roller assembly placed in the storage groove and the film. A storage plate is provided on the side of the back plate away from the traction mechanism. The middle of the storage plate is raised towards the side away from the ground.

[0006] As a preferred embodiment of the present invention, a stop block is provided at one end of the storage plate away from the back plate. The stop block is used to restrict the movement of the take-up roller assembly. The take-up roller assembly placed on the storage plate moves along the surface of the storage plate as the push plate rotates. When the take-up roller assembly is disengaged from the push plate, the take-up roller assembly moves to the junction of the storage plate and the stop block.

[0007] As a preferred embodiment of the present invention, the take-up roller assembly in the storage groove moves along the film traveling direction with the feeding plate. When the take-up roller assembly abuts against the drive roller, the take-up roller assembly is located on the side of the drive roller closer to the traction mechanism.

[0008] As a preferred embodiment of the present invention, a slitting component is further provided on the side of the bottom frame, which is used to slit the film along a direction perpendicular to the film's travel direction.

[0009] As a preferred embodiment of the present invention, the slitting assembly includes a gantry fixedly connected to the bottom frame, a transverse plate slidably connected to the middle of the gantry, a cutter provided on the side of the transverse plate near the bottom frame, and a transverse lead screw rotatably connected to the side of the gantry away from the bottom frame, with the middle of the transverse lead screw threadedly connected to the transverse plate.

[0010] As a preferred embodiment of the present invention, the take-up roller assembly includes a roller body, which is a hollow structure. A positioning protrusion is slidably connected to the side wall of the roller body. Slide rods are slidably connected to both ends of the roller body. A limit ring is provided at one end of the two slide rods near the center of the roller body. A tension spring is provided between the two limit rings. One end of a support rod is rotatably connected to the outer wall of the slide rod, and the other end of the support rod is rotatably connected to the positioning protrusion.

[0011] As a preferred embodiment of the present invention, the outer walls at both ends of the roller body are provided with positioning grooves, and the distance between the two positioning grooves is the same as the distance between the material feeding plates on both sides of the bottom frame.

[0012] As a preferred embodiment of the present invention, the traction mechanism includes a vertical frame disposed above the blown film machine, and clamping components for clamping the film are disposed on the top of the vertical frame and on the side near the winding mechanism.

[0013] As a preferred embodiment of the present invention, the clamping assembly includes a fixed plate fixedly connected to a vertical frame, and clamping rollers with adjustable spacing are provided on both sides of the fixed plate. A rotary drive device for driving the clamping rollers to rotate is provided on the side of the fixed plate located at the top of the vertical frame.

[0014] As a preferred embodiment of the present invention, a first guide roller that cooperates with the film is provided on the bottom side of the vertical frame near the winding mechanism, and a second guide roller that cooperates with the film is provided on the bottom side of the back plate near the traction mechanism.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: 1. By employing a structure in which a rotating seat drives a circumferentially distributed feed plate and a storage plate in coordination, during the winding process, the feed plate automatically transports the spare take-up roller assembly pre-positioned in its positioning groove to the drive roller working position, while simultaneously pushing the fully wound take-up roller assembly along the surface of the storage plate, achieving fully automatic roll changing without stopping the machine. As a result, the extrusion speed and traction speed of the blown film machine remain constant throughout the roll changing process, completely eliminating production interruptions caused by machine stoppages for roll changing, significantly improving the continuous operation efficiency of the production line, reducing the manual roll changing workload, and solving the problems of low efficiency and tension fluctuations caused by machine stoppages for roll changing in existing technologies.

[0016] 2. Because the drive roller and take-up roller assembly use a surface friction drive method, the drive roller rotates at a constant angular velocity, and the take-up roller assembly naturally reduces its rotational speed as the film roll diameter increases. Its surface linear velocity always remains consistent with the linear velocity of the drive roller, naturally possessing constant linear speed take-up characteristics, and the take-up tension does not change with the increase of the roll diameter. In addition, the two-stage clamping components in the traction mechanism and the multi-stage constraints on the film path by the first guide roller and the second guide roller ensure a stable film transport path and small tension fluctuations throughout the entire process. This fundamentally suppresses the generation of longitudinal wrinkles, transverse wrinkles, and diagonal wrinkles caused by tension instability, effectively ensuring the flatness and thickness uniformity of the finished film.

[0017] 3. Because the feed plate is designed as a triangular structure with a raised center and a storage groove is opened at the raised part, during the process of conveying the take-up roller assembly from the storage plate to the drive roller, the raised structure keeps a gap between the take-up roller assembly and the film traveling below, avoiding the feed plate or take-up roller assembly from scratching the film surface during the conveying process, thereby preventing film surface damage and instantaneous tension interference, and ensuring the quality of the film in the roll change transition section.

[0018] 4. Because the take-up roller assembly adopts a hollow cylindrical tube structure and has roller positioning grooves on the outer walls at both ends, the roller positioning grooves and the feed plate form a fitting fit when supporting the roller. This not only achieves axial positioning of the take-up roller assembly and prevents axial movement during the rotation and winding process to ensure a neat winding end face, but also, due to the hollow structure, the rotational inertia of the take-up roller assembly is small, resulting in a small starting torque impact when engaging with the drive roller at the moment of changing rolls, which is conducive to maintaining a smooth transition of film tension.

[0019] 5. Because the take-up roller assembly uses a self-locking linkage mechanism that drives the slide bar to move axially through a tension spring and then drives the positioning protrusion to extend and retract radially through the support rod, the operator only needs to pull the slide bar outward to make the positioning protrusion retract radially and easily remove the finished film roll. After releasing the slide bar, the tension spring automatically resets to make the positioning protrusion extend and clamp the inner wall of the new core. The core loading and unloading operation does not require any tools, which significantly improves the convenience of unloading and material preparation after changing the roll.

[0020] 6. Because the middle of the storage plate bulges outwards towards the side away from the ground, forming an arc-shaped track, the take-up roller assembly can naturally roll along the surface of the storage plate to the predetermined position under its own gravity. This eliminates the need for an additional power mechanism to move the take-up roller assembly, simplifying the overall structure and reducing manufacturing costs and operating energy consumption. A stop block limits and prevents the fully wound take-up roller assembly from rolling off the end of the storage plate, resulting in a simple and reliable structure.

[0021] 7. Because the slitting assembly adopts a cutting method in which the cutter moves at a uniform speed along the width of the film by driving the cutter with a transverse lead screw, the transverse feed speed of the cutter is uniform and controllable, and the film cut is flat and without burrs. This avoids the misalignment of the winding end face caused by uneven cuts and the resulting end face wrinkles, thus ensuring the appearance quality of the finished film roll.

[0022] 8. Since the whole machine uses the bottom frame as a unified mounting base, the traction mechanism, winding mechanism and slitting components are independently installed on the bottom frame, forming a modular structure layout. There are clear interface relationships between each functional unit, which facilitates the disassembly and transportation of the equipment, on-site installation and commissioning, and subsequent maintenance. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a blown film machine traction and winding device to prevent wrinkles.

[0025] Figure 2 This is a front view of a blown film machine traction and winding device to prevent wrinkles.

[0026] Figure 3 This is a schematic diagram of the traction mechanism in a blown film machine traction and winding device to prevent wrinkles.

[0027] Figure 4 This is a schematic diagram of the structure of the traction mechanism after the film is removed in a blown film machine traction and winding device for preventing wrinkles.

[0028] Figure 5 This is a schematic diagram of the winding mechanism in a blown film machine traction and winding device for preventing wrinkles.

[0029] Figure 6 This is a cross-sectional view of the winding mechanism in a blown film machine traction and winding device for preventing wrinkles.

[0030] Figure 7 for Figure 6 The front view.

[0031] Figure 8 This is a schematic diagram of the structure of a winding roller assembly resting on a drive roller in a blown film machine traction and winding device for preventing wrinkles.

[0032] Figure 9 This is a schematic diagram of the slitting component in a blown film machine traction and winding device to prevent wrinkles.

[0033] Figure 10 This is a schematic diagram of the structure of a blown film machine traction and winding device where the feed plate drives the winding roller assembly to rotate.

[0034] Figure 11 for Figure 10 The front view.

[0035] Figure 12 This is a cross-sectional view of the take-up roller assembly in a blown film machine traction and take-up device to prevent wrinkles.

[0036] In the diagram: 1. Bottom frame; 2. Traction mechanism; 3. Winding mechanism; 4. Film blowing machine; 5. Vertical frame; 6. Clamping assembly; 7. First guide roller; 8. Film; 9. Fixing plate; 10. Clamping roller; 11. Back plate; 12. Second guide roller; 13. Drive roller; 14. Winding roller assembly; 15. Rotating seat; 16. Material storage plate; 17. Material feeding plate; 18. Material storage groove; 19. Sliding assembly; 20. Material stop block; 21. Gantry; 22. Transverse plate; 23. Cutting knife; 24. Transverse lead screw; 25. Roller body; 26. Slide rod; 27. Support rod; 28. Limiting ring; 29. ​​Tension spring; 30. Positioning protrusion; 31. Positioning groove. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In one embodiment, see Figure 1 and Figure 2 A wrinkle-resistant blown film machine traction and winding device mainly consists of three parts: a bottom frame 1, a traction mechanism 2, and a winding mechanism 3.

[0039] The bottom frame 1 is a rectangular welded frame structure, which is fitted onto the outer perimeter of the discharge side of the blown film machine 4, serving as the mounting and supporting base for the entire machine. The traction mechanism 2 is vertically installed directly above the die head of the blown film machine 4, used to receive the tubular film bubbles extruded upwards from the die head of the blown film machine 4, flatten them into a double-layer flat film, and then pull and convey them downwards. The winding mechanism 3 is installed on the "left side" of the bottom frame 1, away from the blown film machine 4, used to wind the traction output flat film into a finished film roll under constant tension.

[0040] The overall direction of film 8 is as follows: it is extruded upward from the die head of the blown film machine 4 to form a tubular film bubble, which is flattened and pulled by the traction mechanism 2 and then conveyed downward. After being reversed by the guide roller, it enters the winding mechanism 3 and is finally wound up under constant tension by the winding mechanism 3.

[0041] In one instance of this embodiment, please refer to Figures 1-4 The traction mechanism 2 includes a vertical frame 5, two sets of clamping components 6 and a first guide roller 7.

[0042] The vertical frame 5 is a gantry-type rectangular frame structure, with its bottom vertically fixed to the bottom frame 1. The whole is arranged coaxially with the die head of the blown film machine 4 to ensure that the tubular film bubble enters the clamping assembly 6 in the center, avoiding uneven thickness caused by the film bubble being skewed.

[0043] A set of clamping components 6 is provided on the top of the vertical frame 5 and on the side of the vertical frame 5 near the winding mechanism 3 (the middle of the left side of the vertical frame 5). Each set of clamping components 6 includes two fixing plates 9 and two clamping rollers 10. The two fixing plates 9 are symmetrically fixed on the front and rear beams of the vertical frame 5, and the two clamping rollers 10 are arranged horizontally and parallel, with their two ends rotatably connected between the two fixing plates 9 through bearing seats.

[0044] The clamping assembly 6 located at the top of the vertical frame 5 is an active traction clamping assembly. Its specific configuration is as follows: one clamping roller 10 is an active steel roller, its end extending out of the fixed plate 9 and connected to the output shaft of the rotary drive device. The rotary drive device preferably uses a geared variable frequency motor to provide precisely adjustable and stable traction power. The other clamping roller 10 is a driven rubber pressure roller, its two ends slidably connected to the fixed plate 9 via sliding seats, and works with a cylinder to adjust the clamping distance between the two rollers, thereby providing adjustable clamping force. This top clamping assembly 6 has dual functions: firstly, through the clamping cooperation of the active steel roller and the driven rubber pressure roller, it pulls the film 8 upward at a constant linear speed; secondly, by clamping and sealing the end of the tubular film bubble, it maintains stable internal air pressure, preventing fluctuations in the film bubble diameter and uneven thickness of the film 8 due to air leakage, thus reducing the possibility of longitudinal wrinkles from the forming source.

[0045] The clamping assembly 6 located on the side of the vertical frame 5 near the winding mechanism 3 is an auxiliary tensioning clamping group. Both of its clamping rollers 10 are driven rollers and do not have a driving structure. The main function of this clamping assembly 6 is to perform secondary clamping and limiting on the film 8 that has been pulled downward by the top clamping assembly 6, further stabilizing the conveying tension of the film 8 and preventing the film 8 from causing oblique wrinkles due to slack and deviation.

[0046] The first guide roller 7 is rotatably mounted on the bottom of the vertical frame 5 near the winding mechanism 3. Its axis is parallel to the clamping roller 10, and the roller surface is mirror-polished to reduce the coefficient of friction between the film 8 and the roller surface, thereby reducing frictional damage to the surface of the film 8. The film 8, which is vertically conveyed downward from the clamping assembly 6, is redirected by the first guide roller 7 and conveyed towards the winding mechanism 3 in an approximately horizontal state. The arrangement of the first guide roller 7 ensures that the film 8 forms a reasonable wrap angle on it, avoiding creases caused by excessive bending.

[0047] In one instance of this embodiment, please refer to Figures 5-11 The winding mechanism 3 includes a back plate 11, a drive roller 13, a winding roller assembly 14, a rotating seat 15, a feeding plate 17, a storage plate 16, a stop block 20, and a second guide roller 12.

[0048] Two back plates 11 are vertically and symmetrically fixed to the front and rear sides of the bottom frame 1, serving as the mounting base for the various functional components of the winding unit. The drive roller 13 is arranged horizontally in a back-to-back orientation on the upper part of the two back plates 11, with its two ends rotatably connected to the corresponding back plates 11 via bearing seats. A winding variable frequency motor is installed on the rear back plate 11 away from the traction mechanism 2. The winding variable frequency motor is connected to the shaft end of the drive roller 13 via a belt drive mechanism, driving the drive roller 13 to rotate at a constant angular velocity. The outer circumferential surface of the drive roller 13 is covered with a wear-resistant rubber layer. This rubber layer increases the coefficient of friction between the drive roller 13 and the winding roller assembly 14 to ensure the reliability of surface friction transmission, and also prevents the metal surface of the drive roller 13 from directly contacting the film 8 and scratching it.

[0049] During winding, the drive roller 13 rotates at a constant angular velocity in a counterclockwise direction. Through the friction of its surface, it drives the take-up roller assembly 14 to rotate in the opposite direction to the drive roller 13 in a clockwise direction, achieving surface friction winding. Since the angular velocity of the drive roller 13 remains constant, and the outer diameter of the film roll in the take-up roller assembly 14 gradually increases as winding progresses, the rotational speed of the take-up roller assembly 14 will naturally decrease as the roll diameter increases. The linear velocity of its surface is always consistent with the linear velocity of the drive roller 13, thus naturally possessing the characteristic of constant linear speed winding, and the winding tension does not change with the increase of the roll diameter.

[0050] The second guide roller 12 is rotatably mounted on the bottom of the two back plates 11, near the right side of the bottom of the back plate 11, and is arranged parallel to the drive roller 13. The film 8 conveyed from the first guide roller 7 first passes downward around the second guide roller 12, and then rises to adhere to the surface of the drive roller 13. The angle at which the film 8 enters the drive roller 13 is adjusted by the second guide roller 12 to ensure that there is a sufficient contact wrap angle between the film 8 and the drive roller 13, thereby making the tension transmission between the film 8 and the drive roller 13 stable and reliable.

[0051] Two rotating seats 15 are rotatably mounted on the outer side walls of two back plates 11 away from the center of the bottom frame 1 via rotating shafts, and the two rotating seats 15 are coaxially arranged. A drive motor is provided on the right side of the rear back plate 11 near the traction mechanism 2. The drive motor drives a rotating shaft to rotate through a belt transmission mechanism. The rotating shaft then transmits power to the two rotating seats 15 through a gear transmission mechanism, so that the two rotating seats 15 rotate synchronously.

[0052] Three material-pushing plates 17 are evenly distributed circumferentially on the outer side of each rotating seat 15, extending radially outward along the rotating seat 15. Each material-pushing plate 17 has a triangular structure with a centrally raised section, and a recessed material storage groove 18 is formed at the raised section. The cross-sectional dimensions of the material storage groove 18 are adapted to the outer diameter of the shaft end of the take-up roller assembly 14, allowing it to be engaged with the end of the take-up roller assembly 14, thus supporting and axially limiting the take-up roller assembly 14.

[0053] The storage plate 16 is fixedly installed on the side of the back plate 11 away from the traction mechanism 2, in the "left side area of ​​the back plate 11". It is a long strip plate structure and is arranged obliquely along the side wall of the back plate 11. The middle part of the storage plate 16 bulges towards the side away from the ground, forming a smooth arc-shaped track surface. An upwardly protruding stop block 20 is fixedly installed at the outer end of the storage plate 16 away from the back plate 11. The stop block 20 is used to limit and stop the take-up roller assembly 14 that rolls along the surface of the storage plate 16 to its end, preventing the take-up roller assembly 14 from accidentally rolling off the storage plate 16.

[0054] In one instance of this embodiment, please refer to Figure 8 and Figure 9 A slitting assembly 19 is provided above the take-up roller assembly 14 on the side away from the traction mechanism 2, "to the upper left of the take-up roller". The slitting assembly 19 is mounted across the bottom frame 1 and is used to cut the film 8 laterally along the width direction of the film 8 when changing rolls.

[0055] The slitting assembly 19 includes a gantry 21, a transverse plate 22, a cutter 23, and a transverse lead screw 24. The gantry 21 is a portal frame structure, with its two ends fixedly connected to the front and rear sides of the bottom frame 1, respectively. A transverse guide rail is installed on the crossbeam of the gantry 21, and the transverse plate 22 is slidably connected to the transverse guide rail via a slider, allowing the transverse plate 22 to move smoothly back and forth along the width direction of the film 8. The cutter 23 is fixedly installed on the lower surface of the transverse plate 22, with its blade aligned with the surface of the film 8. The cutter 23 can be selected from flat blades or round blades depending on the material of the film 8 being processed: for thinner or softer films 8, flat blades are preferred to ensure a smooth cut; for thicker or harder films 8, round blades are preferred to improve cutting efficiency.

[0056] The transverse lead screw 24 is rotatably mounted on the side of the gantry 21 away from the bottom frame 1 (i.e., above the crossbeam of the gantry 21), and is arranged parallel to the transverse guide rail. A lead screw nut is fixedly mounted on the transverse plate 22, and the lead screw nut is threadedly engaged with the transverse lead screw 24 to form a lead screw nut transmission pair. One end of the transverse lead screw 24 can be equipped with a drive motor or a manually operated handwheel. When the transverse lead screw 24 rotates around its own axis under external force, it drives the transverse plate 22 to move linearly along the transverse guide rail through the threaded engagement. The cutter 23 then sweeps across the surface of the film 8 along the width direction of the film 8, cutting the film 8 transversely. Because the lead of the transverse lead screw 24 is constant and the rotation speed is controllable, the transverse feed speed of the cutter 23 is uniform and stable, and the cut of the film 8 is flat and free of burrs, which can effectively avoid the misalignment and wrinkling defects of the winding end face caused by uneven cuts.

[0057] In one instance of this embodiment, please refer to Figure 11 and Figure 12 The take-up roller assembly 14 includes a roller body 25, a positioning protrusion 30, a slide bar 26, a limiting ring 28, a tension spring 29, a positioning groove 31, and a support rod 27. The roller body 25 has a hollow cylindrical structure and is preferably made of lightweight metal material to reduce its own weight and moment of inertia, thereby reducing the impact of the starting torque at the moment of roll change and helping to maintain a smooth transition of film tension 8. Slide bars 26 are coaxially slidably mounted inside both ends of the roller body 25. The slide bars 26 can extend outward or retract inward along the axial direction of the roller body 25. Limiting rings 28 are fixedly provided at the ends of the two slide bars 26 that are close to each other (i.e., the ends close to the center of the roller body 25), and tension springs 29 are connected between the two limiting rings 28. The tension springs 29 are in a stretched state under normal conditions and always apply an inward pulling force towards the center of the roller body 25 to the two slide bars 26, keeping the slide bars 26 in the retracted position.

[0058] Multiple sets of sliding holes are radially formed on the side wall of the roller body 25, and a positioning protrusion 30 is slidably installed in each sliding hole. One end of a support rod 27 is rotatably connected to the outer peripheral wall of the slide rod 26 corresponding to the position of each positioning protrusion 30, and the other end of the support rod 27 is rotatably connected to the inner end of the corresponding positioning protrusion 30. The support rod 27, slide rod 26, and positioning protrusion 30 together constitute a linkage transmission mechanism: When the slide rod 26 slides inward under the tension of the tension spring 29, the support rod 27 deflects relative to the slide rod 26, and its outer end pushes the positioning protrusion 30 to extend radially outward, thereby locking the inner wall of the core sleeved on the outside of the roller body 25, realizing the circumferential fixation of the core and the roller body 25, and preventing the core from slipping relative to the roller body 25 during winding; when the operator pulls the slide rod 26 outward against the tension of the tension spring 29, the support rod 27 deflects in the opposite direction, pulling the positioning protrusion 30 to retract radially inward, so that the positioning protrusion 30 disengages from the inner wall of the core, at which point the core of the finished film roll can be easily removed, completing the unloading operation. This linkage transmission mechanism has a compact structure and reliable operation, realizing tool-free operation for core assembly and disassembly, and significantly improving work efficiency.

[0059] The outer walls at both ends of the roller body 25 are respectively provided with annular roller positioning grooves 31. The axial distance between the two roller positioning grooves 31 is consistent with the distance between the material feeding plates 17 installed on the front and rear sides of the bottom frame 1. When the material storage grooves 18 of the material feeding plates 17 are engaged with the two ends of the take-up roller assembly 14, the positioning grooves 31 of the roller body and the material storage grooves 18 of the material feeding plates 17 form a fitting fit, thereby achieving axial positioning of the take-up roller assembly 14 and preventing axial movement during rotation and winding or conveying, thus ensuring that the winding end face is neat and without misalignment.

[0060] This embodiment includes the following steps during implementation: Step 1: Preparing materials before starting the machine Before starting the equipment, the operator first completes the material preparation operation. The empty core is inserted into the outside of the roll body 25 of the take-up roll assembly 14. Under normal conditions, the tension spring 29 pulls the slide bar 26 to the retracted position, and the support rod 27 pushes the positioning protrusion 30 to extend radially outward and clamp the inner wall of the core, achieving circumferential fixation of the core. The take-up roll assembly 14 with the core installed is placed on the side of the storage plate 16 near the drive roller 13 (i.e., the right-side inclined area of ​​the storage plate 16). Under its own gravity, the take-up roll assembly 14 rolls downward along the right-side inclined area of ​​the storage plate 16 until its outer circumferential surface abuts against the surface of the drive roller 13. At this point, the take-up roll assembly 14 is in the working position, ready to begin winding.

[0061] Simultaneously, another spare take-up roller assembly 14, already loaded with an empty core, is placed in the storage groove 18 of the material feeding plate 17 located "upper right" above the rotating seat 15 facing the traction mechanism 2. The roller positioning groove 31 of the spare take-up roller assembly 14 engages with the material feeding plate 17 to achieve axial positioning. At this time, the spare take-up roller assembly 14 is not in contact with the drive roller 13 and is in a standby state.

[0062] Step 2: Initial membrane penetration The tubular film bubble extruded upwards from the die head of the blown film machine 4 is introduced between the two clamping rollers 10 of the clamping assembly 6 at the top of the vertical frame 5. The spacing of the clamping rollers 10 is adjusted by a cylinder to properly clamp the film bubble, flattening the circular tubular film bubble into a double-layer flat film. At the same time, the top clamping assembly 6 forms a clamping seal on the end of the film bubble, maintaining the stability of the air pressure inside the film bubble. Then, the flattened film 8 is passed downwards sequentially between the two clamping rollers 10 of the side clamping assembly 6, around the bottom of the first guide roller 7, and then downwards around the bottom of the second guide roller 12. It is then attached upwards to the surface of the drive roller 13. Finally, the starting free end of the film 8 is fixed to the core of the take-up roller assembly 14 located in the working position by adhesive or other detachable means, completing the initial film threading process.

[0063] Step 3: Normal winding-up operation The production line is started. The blown film machine 4 extrudes tubular film bubbles at a preset process speed; the drive motor of the top clamping assembly 6 starts, driving the active steel roller to rotate at a constant linear speed matching the extrusion speed, thereby clamping and pulling the film 8 upward. At the same time, the clamping and sealing effect of the clamping assembly 6 maintains the stability of the air pressure inside the film bubble, ensuring that the film 8 has a uniform thickness. The side clamping assembly 6 performs secondary clamping and limiting on the film 8 after it has turned, preventing the film 8 from loosening; the first guide roller 7 and the second guide roller 12 provide two-stage guiding constraints on the conveying path of the film 8, jointly ensuring that the film 8 is stable and does not deviate or loosen during the conveying process.

[0064] A variable frequency drive motor drives the drive roller 13 to rotate at a constant angular velocity. Through the friction between the wear-resistant rubber layer on the surface of the drive roller 13 and the outer circumferential surface of the take-up roller assembly 14, the take-up roller assembly 14 rotates clockwise, and the film 8 is evenly wound onto the core of the take-up roller assembly 14. As winding continues, the outer diameter of the film roll gradually increases, and the rotational speed of the take-up roller assembly 14 naturally decreases as the roll diameter increases. Its surface linear velocity remains consistent with the surface linear velocity of the drive roller 13, achieving constant linear speed winding. The tension of the film 8 remains stable throughout the process, effectively avoiding various wrinkles caused by tension fluctuations. During this process, as the diameter of the film roll increases, the take-up roller assembly 14 gradually moves slowly to the left along the right inclined surface of the storage plate 16.

[0065] Step 4: Roll change triggering and spare take-up roll conveying When the film roll reaches the preset diameter or preset winding length, the control system triggers the roll changing procedure.

[0066] The servo mechanism drives the two rotating seats 15 to rotate slowly counterclockwise in sync. The material guide plate 17 located on the upper right of the rotating seat 15 rotates with the rotating seat 15, driving the spare take-up roller assembly 14, which is pre-placed in its storage groove 18, to move counterclockwise together. During the conveying process, the spare take-up roller assembly 14 is always supported by the storage groove 18 of the material guide plate 17. Due to the raised structure in the middle of the material guide plate 17, the take-up roller assembly 14 maintains a gap with the film 8 traveling below in most sections of the conveying trajectory, and does not contact the surface of the film 8, thereby avoiding scratching and damage to the film 8 and avoiding instantaneous interference with the conveying tension of the film 8. As the rotating seat 15 continues to rotate, the unloaded spare take-up roller assembly 14 is conveyed to the upper right of the drive roller 13 and falls to abut against the surface of the drive roller 13. The unloaded take-up roller assembly 14 rotates adaptively.

[0067] Meanwhile, the material feeding plate 17 located on the left side of the rotating base 15 rotates with the rotating base 15, and its end pushes the take-up roller assembly 14, which carries the fully wound film 8, so that it continues to move to the upper left along the right slope of the storage plate 16. As the distance between the fully wound take-up roller assembly 14 and the drive roller 13 gradually increases, the film 8 wound on the fully wound take-up roller assembly 14 gradually separates from the surface of the drive roller 13, creating operating space for the subsequent film 8 cutting process.

[0068] Step 5: Cut the film 8 When the film 8 on the fully wound take-up roller assembly 14 is completely separated from the drive roller 13, and the unloaded standby take-up roller assembly 14 is reliably abutting against the surface of the drive roller 13, the slitting assembly 19 is activated.

[0069] Driven by a drive motor or manual handwheel, the transverse lead screw 24 rotates around its own axis, driving the transverse plate 22 to move linearly along the transverse guide rail of the gantry 21 via the lead screw nut transmission pair. The cutter 23 moves laterally along the width direction of the film 8 along with the transverse plate 22. During the movement, the blade of the cutter 23 cuts across the surface of the film 8, transversely severing the film 8 that is tensioned between the full roll take-up roller assembly 14 and the drive roller 13, resulting in a clean cut without burrs.

[0070] Step Six: Automatic Splicing and Full Roll Separation After the film 8 is cut, the free end of the film 8 located outside the drive roller 13 moves with the surface of the drive roller 13 under the rotation of the drive roller 13 and is pressed between the drive roller 13 and the empty take-up roller assembly 14 located at the upper right working position of the drive roller 13. The free end automatically winds onto the core of the empty take-up roller assembly 14 under the action of friction, realizing the automatic connection between the old and new take-up rollers and completing the roll change.

[0071] Throughout the roll changing process, the extrusion speed of the blown film machine 4, the traction linear speed of the traction mechanism 2, and the rotational linear speed of the drive roller 13 remain constant without any sudden changes. The tension of the film 8 remains stable throughout the process, and the film 8 in the roll changing transition section is flat and wrinkle-free.

[0072] Step 7: Unload the full roll After the roll change is completed, the rotating base 15 continues to rotate counterclockwise. The material guide plate 17 on the left side of the rotating base 15 continues to move with the rotating base 15, pushing the fully wound take-up roller assembly 14 from the right slope area of ​​the storage plate 16 past the highest point of the central ridge of the storage plate 16, so that it enters the left slope area of ​​the storage plate 16. Under its own gravity, the fully wound take-up roller assembly 14 rolls down and to the left along the left slope of the storage plate 16, and is finally stopped by the stop block 20 set at the end of the storage plate 16. The fully wound take-up roller assembly 14 is stably stopped at the junction of the storage plate 16 and the stop block 20, waiting for the operator to remove it.

[0073] Step 8: Circular Material Preparation The operator manually pulls the slide bars 26 at both ends of the fully wound take-up roller assembly 14 outwards, overcoming the tension of the tension spring 29, causing the slide bars 26 to extend outwards. The support rod 27 then deflects and pulls the positioning protrusion 30 radially inwards, disengaging the positioning protrusion 30 from the inner wall of the roll core. The operator removes the roll core of the finished film roll from the roller body 25, completing the unwinding. Subsequently, the operator inserts a new empty roll core into the roller body 25, releases the slide bars 26, and the tension spring 29, under its elastic restoring force, pulls the slide bars 26 inwards. The support rod 27 deflects in the opposite direction, pushing the positioning protrusion 30 radially outwards and locking it against the inner wall of the new roll core. The take-up roller assembly 14, now reloaded with an empty roll core, is placed in the material storage groove 18 of the material feeding plate 17 on the upper right of the rotating seat 15, serving as a spare take-up roller assembly 14 for the next roll change, awaiting the triggering of the roll change procedure again.

[0074] By repeating this cycle, the device can enable the blown film production line to operate continuously for extended periods without interruption.

[0075] This invention provides a wrinkle-resistant blown film machine traction and winding device. A rotating base 15 drives a circumferentially distributed feed plate 17 and an arc-shaped storage plate 16 to work together, achieving automatic feeding of the spare winding roller and automatic unloading of the full roll. The entire roll change process requires no machine downtime, completely eliminating production interruptions caused by downtime during roll changes and the severe fluctuations in film bubble tension caused by mismatch between traction and extrusion speeds during start-up and shutdown. This fundamentally avoids the problem of wrinkles in the initial section of film 8 after restarting. Simultaneously, the drive roller 13 uses surface friction drive, rotating the winding roller assembly 14 at a constant angular velocity. Its surface linear velocity does not change with the increase of the film roll diameter, naturally possessing constant linear speed winding characteristics. Combined with the two-stage clamping assembly 6 and multi-stage guide rollers in the traction mechanism 2 constraining the path of film 8, stable tension control accuracy is maintained throughout the entire roll diameter range. This effectively prevents defects such as film 8 deviation, uneven slack, and irregular wrinkles on the end face caused by tension instability, significantly improving the flatness and appearance quality of the finished film 8.

[0076] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. A wrinkle-resistant blown film machine traction and winding device, comprising a bottom frame sleeved on the outside of the blown film machine, characterized in that, It also includes a traction mechanism and a winding mechanism; The traction mechanism, located directly above the blown film machine, is used to pull the film out of the blown film machine and flatten it; The winding mechanism is located on the side of the bottom frame away from the traction mechanism. It includes a back plate that is fixedly connected to both sides of the bottom frame. The ends of the two back plates are rotatably connected to the two ends of the drive roller. A winding roller assembly for winding film is placed on the drive roller. A rotating seat is rotatably connected to the side of the back plate away from the center of the bottom frame. Multiple material-pushing plates are distributed around the outer circumference of the rotating seat. The material-pushing plates are triangular structures with a raised center. A storage groove for placing the winding roller assembly is opened in the raised center. When the material-pushing plate rotates to face the traction mechanism, there is a gap between the winding roller assembly placed in the storage groove and the film. A storage plate is provided on the side of the back plate away from the traction mechanism. The middle of the storage plate is raised towards the side away from the ground.

2. The anti-wrinkle blown film machine traction and winding device according to claim 1, characterized in that, A stop block is provided at one end of the storage plate away from the back plate. The stop block is used to restrict the movement of the take-up roller assembly. The take-up roller assembly placed on the storage plate moves along the surface of the storage plate as the push plate rotates. When the take-up roller assembly disengages from the push plate, the take-up roller assembly moves to the junction of the storage plate and the stop block.

3. The anti-wrinkle blown film machine traction and winding device according to claim 1, characterized in that, The take-up roller assembly in the storage groove moves along the film travel direction with the feeding plate. When the take-up roller assembly comes into contact with the drive roller, the take-up roller assembly is located on the side of the drive roller closer to the traction mechanism.

4. The anti-wrinkle blown film machine traction and winding device according to claim 1, characterized in that, The bottom frame is also provided with a slitting component on its side, which is used to slit the film along a direction perpendicular to the film's travel direction.

5. The anti-wrinkle blown film machine traction and winding device according to claim 4, characterized in that, The slitting assembly includes a gantry fixedly connected to the bottom frame, a transverse plate slidably connected to the middle of the gantry, a cutter provided on the side of the transverse plate near the bottom frame, and a transverse lead screw rotatably connected to the side of the gantry away from the bottom frame, with the middle of the transverse lead screw threadedly connected to the transverse plate.

6. The anti-wrinkle blown film machine traction and winding device according to claim 1, characterized in that, The take-up roller assembly includes a roller body, which is a hollow structure. A positioning protrusion is slidably connected to the side wall of the roller body. Slide rods are slidably connected to both ends of the roller body. A limit ring is provided at one end of the two slide rods near the center of the roller body. A tension spring is provided between the two limit rings. One end of a support rod is rotatably connected to the outer wall of the slide rod, and the other end of the support rod is rotatably connected to the positioning protrusion.

7. The anti-wrinkle blown film machine traction and winding device according to claim 6, characterized in that, The outer walls at both ends of the roller body are provided with positioning grooves, and the distance between the two positioning grooves is the same as the distance between the material feeding plates on both sides of the bottom frame.

8. The anti-wrinkle blown film machine traction and winding device according to claim 1, characterized in that, The traction mechanism includes a vertical frame positioned above the blown film machine, with clamping components for holding the film located on the top of the vertical frame and on the side near the winding mechanism.

9. The anti-wrinkle blown film machine traction and winding device according to claim 8, characterized in that, The clamping assembly includes a fixed plate fixedly connected to the vertical frame, and clamping rollers with adjustable spacing are provided on both sides of the fixed plate. A rotary drive device for driving the clamping rollers to rotate is provided on the side of the fixed plate located at the top of the vertical frame.

10. The anti-wrinkle blown film machine traction and winding device according to claim 8, characterized in that, The bottom of the vertical frame is provided with a first guide roller that cooperates with the film on the side near the winding mechanism, and the bottom of the back plate is provided with a second guide roller that cooperates with the film on the side near the traction mechanism.

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