Heavy package film blowing rotation traction mechanism

Abstract

The utility model discloses a heavy package film blowing rotating traction mechanism which comprises a rotating supporting gear, a driven force transmission roller, a driving force transmission roller and an unpowered transmission roller are arranged above the rotating supporting gear, an unpowered hard roller is arranged on the outer side of the unpowered transmission roller, a follow-up hard roller is arranged on the outer side of the unpowered transmission roller, and a driven force transmission roller is arranged on the outer side of the follow-up hard roller. A follow-up air cushion roller is arranged at the top of the unpowered transmission roller; an upper-layer rotary supporting seat is arranged at the top of the rotary roller, rotary gear sets are coaxially arranged at the top and the bottom of the upper-layer rotary supporting seat, and a reversing box is arranged on one side of each rotary gear set. According to the film blowing device, rotation and traction in the film blowing process are accurately controlled, it can be ensured that a film keeps stable traction speed and tension, and the uniformity and consistency of the film are improved; the cooling time and the production period of the film can be shortened, so that the speed of a production line is increased; and flexible adjustment can be carried out according to different production requirements, and the device can adapt to various types of film specifications.

Description

Technical Field

[0001] This utility model relates to the field of blown film machine technology, and specifically to a rotary traction mechanism for heavy-duty blown film. Background Technology

[0002] A blown film machine is a specialized piece of equipment used to produce plastic films. It uses an extrusion molding process to heat and melt plastic granules, which are then extruded through a ring die to form tubular film bubbles. These bubbles are then processed through traction, cooling, and winding to create single-layer or multi-layer plastic films. The blown film traction operation is a crucial step in the plastic film manufacturing process. It involves extruding molten plastic raw materials through a die to form film bubbles, then using a rotating traction device to change the shape and thickness of the film bubbles, ultimately winding them into film rolls.

[0003] In existing blown film machines, the cylindrical film bubbles extruded from the annular extrusion nozzle exhibit poor thickness uniformity at various points during production. This leads to gradual accumulation and stacking of the film at the same locations on the wound roll, resulting in poor winding quality. While rotating the lower die head while fixing the upper traction device can improve thickness uniformity, the complex structure of the rotating die head, coupled with maintenance difficulties and poor sealing performance, easily leads to material leakage. Conversely, fixing the lower die head while rotating the upper circular traction bracket to improve thickness uniformity results in a periodic sinusoidal distribution of thickness errors, failing to completely resolve the issue of uneven film roll thickness after winding. Utility Model Content

[0004] The purpose of this utility model is to provide a rotary traction mechanism for heavy-duty blown film to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution, including:

[0006] A rotating support gear, above which are arranged multiple sets of parallel rotating rollers;

[0007] The rotating roller includes a passive power transmission roller, a primary power transmission roller, and a non-powered transmission roller. A non-powered rigid roller is provided on the outside of the non-powered transmission roller, a follower rigid roller is provided on the top of the non-powered rigid roller, and a follower air cushion roller is provided on the top of the non-powered transmission roller.

[0008] The top of the rotating roller is provided with an upper slewing support base, and a slewing gear set is coaxially arranged at the top and bottom of the upper slewing support base. A reversing box is provided on one side of the slewing gear set.

[0009] A rotary drive gear is provided on one side of the rotary support gear, and a rotary drive motor is provided on one side of the drive gear.

[0010] As a further description of the above technical solution, the top of the rotating support gear is symmetrically provided with mounting plates, and the end of the rotating roller is detachably mounted on the mounting plates.

[0011] As a further description of the above technical solution, the rotating roller is symmetrically provided with seated bearings at its ends, and the rotating roller is detachably connected to the mounting plate through the seated bearings.

[0012] As a further description of the above technical solution, a circular assembly plate is provided in the middle of the mounting plate, and the outer side of the end of the main power transmission roller is detachably connected to the circular assembly plate on the mounting plate through a seated bearing.

[0013] As a further description of the above technical solution, a support tube is provided on the top inner side of the circular assembly plate, and a non-powered rigid roller is provided on the bottom inner side of the circular assembly plate.

[0014] As a further description of the above technical solution, a beveled gear is installed on the inner side of the circular mounting plate, a drive wheel set is provided on the outer side of the mounting plate, and drive motor sets are provided on both sides of the drive wheel set. The output end of the drive motor set is rotatably connected to the drive wheel set through a synchronous belt.

[0015] As a further description of the above technical solution, the active power transmission roller is disposed between the passive power transmission roller and the unpowered transmission roller. The passive power transmission roller includes a water-cooling roller and a surface-coated roller arranged in parallel. The active power transmission roller includes two sets of water-cooling rollers arranged in parallel. The unpowered transmission roller includes a water-cooling roller and a surface-coated roller arranged in parallel.

[0016] As a further description of the above technical solution, a rotary joint is provided on the outer side of the end of the water-cooling roller, and the water-cooling roller is connected to an external water supply end through the rotary joint.

[0017] As a further description of the above technical solution, the outer side of the end of the surface-coated roller is rotatably connected to the drive wheel assembly, a sliding guide rail is provided at the bottom of the bearing seat on the inner side of the end of the surface-coated roller, a tensioning cylinder is provided below the guide rail, and a rotating screw is provided at the top of the bearing seat on the inner side of the end of the surface-coated roller.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention utilizes a drive motor unit that drives multiple sets of rotating rollers via a belt-driven drive wheel assembly. These rollers, in conjunction with follower rollers, traction and stretch the film. A bottom rotating support gear and a top rotating drive gear, working in conjunction with a reversing box, rotate to achieve precise control of rotation and traction during the film blowing process. This ensures the film maintains a stable traction speed and tension during production, improving film uniformity and consistency, and thus optimizing the film's physical properties. Furthermore, it reduces film cooling time and production cycles, thereby accelerating the production line. It can also be flexibly adjusted to meet different production needs, adapting to various film specifications and enhancing the flexibility and adaptability of the production line.

[0020] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the rotary traction mechanism for heavy-duty blown film of this utility model;

[0022] Figure 2 This is the front view of the rotary traction mechanism for heavy-duty blown film of this utility model;

[0023] Figure 3 This is a side view of the rotary traction mechanism for heavy-duty blown film of this utility model;

[0024] Figure 4 This is a top view of the rotary traction mechanism for heavy-duty blown film of this utility model;

[0025] Figure 5 This is a cross-sectional view of the rotary traction mechanism for heavy-duty blown film of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the active power transmission roller of this utility model.

[0027] Figure label:

[0028] 1. Rotating support gear; 2. Rotating roller; 201. Passive power transmission roller; 202. Active power transmission roller; 203. Unpowered transmission roller; 3. Unpowered rigid roller; 4. Follower rigid roller; 5. Follower air cushion roller; 6. Upper rotary support seat; 7. Rotary gear set; 8. Reversing box; 9. Rotary drive gear; 10. Rotary drive motor; 11. Mounting plate; 12. Bearing with seat; 13. Circular assembly plate; 14. Support tube; 15. Angle gear; 16. Drive wheel set; 17. Drive motor set; 18. Water cooling roller; 19. Surface coated roller; 20. Rotary joint; 21. Sliding guide rail; 22. Tensioning cylinder; 23. Rotating screw. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0030] like Figures 1-6 As shown, in one embodiment, a heavy-duty blown film rotary traction mechanism includes: a rotary support gear 1, and a plurality of parallel rotary rollers 2 are detachably mounted above the rotary support gear 1 for traction and stretching of the film.

[0031] Furthermore, a rotary drive gear 9 is provided on one side of the rotary support gear 1, and a rotary drive motor 10 is provided on the other side of the drive gear. It can be understood that the output end of the rotary drive motor 10 is rotatably connected to the rotary drive gear 9, and the rotary drive gear 9 meshes with the rotary support gear 1, so that after the rotary drive motor 10 is started, it can drive the rotary drive gear 9 to rotate, and in turn drive the rotary support gear 1 to rotate.

[0032] It should be explained in detail that a drive wheel set 16 is provided on the outer side of the mounting plate 11, including a belt pulley for transmission and a synchronous belt pulley for adjusting the transmission direction. Drive motor sets 17 are provided on both sides of the drive wheel set 16, so that the output end of the drive motor set 17 can be rotatably connected to the drive wheel set 16 through belt transmission, thereby driving the rotating roller 2 installed on the inner side to rotate.

[0033] Furthermore, mounting plates 11 are symmetrically arranged on the top of the rotating support gear 1, and the ends of multiple sets of rotating rollers 2 are detachably mounted on the mounting plates 11. The rotating rollers 2 include a passively driven transmission roller 201, a primary power transmission roller 202, and a non-powered transmission roller 203. Specifically, the primary power transmission roller 202 is disposed between the passively driven transmission roller 201 and the non-powered transmission roller 203, and is used for traction and stretching of the film.

[0034] Please continue reading. Figures 1-6 In this embodiment, the bottom passive power transmission roller 201 includes a set of water-cooling rollers 18 and a set of surface-coated rollers 19 arranged in parallel. The ends of both sides of the water-cooling rollers 18 and the surface-coated rollers 19 are equipped with seated bearings 12, so that the two sets of passive power transmission rollers 201 can be detachably mounted on the mounting holes reserved on the mounting plate 11 through the seated bearings 12.

[0035] It is understood that a set of drive wheels 16 are correspondingly provided on the outer side of the mounting plate 11 for the water cooling roller 18 and the surface coating roller 19, and a set of drive motors 17 are correspondingly provided on one side of the drive wheels 16. The drive motors 17 can then be driven by pulleys and synchronous pulleys to rotate the water cooling roller 18 and the surface coating roller 19. In addition, a rotary joint 20 is also installed on the outer side of one end of the shaft of the water cooling roller 18, so that the water cooling roller 18 can be connected to an external water supply end through the rotary joint 20 to circulate cooling water and thus perform preliminary cooling of the film.

[0036] It should be explained in detail that a set of circular sliding guide rails 21 are also installed at the bottom of the bearing 12 on the inner side of the end of the bottom surface coating roller 19 via a sliding plate, thereby realizing the horizontal sliding of the surface coating roller 19 and adjusting the distance between the water cooling roller 18 and the surface coating roller 19; and two sets of tensioning cylinders 22 are correspondingly provided below the guide rails for tensioning the surface coating roller 19 inward or outward; correspondingly, a rotating screw 23 is also provided at the top of the bearing 12 on the inner side of the end of the surface coating roller 19, and the roller assembly is limited by rotating the knob at the end of the rotating screw 23.

[0037] Please continue reading. Figures 1-6 In this embodiment, the middle-layer active power transmission roller 202 includes two sets of water-cooled rollers 18 arranged in parallel. The ends of the water-cooled rollers 18 are equipped with seated bearings 12, so that the two sets of active power transmission rollers can be detachably mounted on the mounting holes reserved on the mounting plate 11 through the seated bearings 12.

[0038] Understandably, a set of drive wheels 16 is also provided on the outer side of the mounting plate 11 for the water cooling roller 18, and a set of drive motors 17 is provided on one side of the drive wheels 16. The drive motors 17 can be driven by pulleys and synchronous pulleys to rotate the water cooling roller 18 and the surface coating roller 19. Correspondingly, a rotary joint 20 is also installed on the outer side of one end of the shaft of the water cooling roller 18, so that the water cooling roller 18 can be connected to the external water supply end through the rotary joint 20 to circulate cooling water and thus cool the film a second time.

[0039] It should be explained in detail that the two sets of water-cooling rollers 18 in the middle layer are installed and disassembled as a whole through the circular mounting plate 13. The circular mounting plate 13 is detachably installed in the middle of the mounting plate 11, while the outer side of the end of the main power transmission roller 202 is detachably connected to the circular mounting plate 13 on the mounting plate 11 through the seated bearing 12.

[0040] Specifically, a set of square support tubes 14 are provided on the top inner side of the circular assembly plate 13 to strengthen the structure; correspondingly, a set of metal non-powered rigid rollers 3 are provided on the bottom inner side of the circular assembly plate 13 to guide the film conveyed by the power transmission rollers 201; and a bevel gear 15 is installed on the inner side of the circular assembly plate 13, which, together with the small gear on the outer side and a set of drive motors 17, realizes the overall rotation of the circular assembly plate 13.

[0041] Please continue reading. Figures 1-6 In this embodiment, the top-layer unpowered transmission roller 203 includes a set of water-cooling rollers 18 and a set of surface-coated rollers 19 arranged parallel to and opposite to the bottom layer. Both ends of the water-cooling rollers 18 and the surface-coated rollers 19 are equipped with seated bearings 12, allowing the two sets of powered transmission rollers 201 to be detachably mounted on the mounting holes pre-drilled in the mounting plate 11 via the seated bearings 12.

[0042] Understandably, a set of drive wheels 16 is also provided on the outer side of the mounting plate 11 for the water cooling roller 18 and the surface coating roller 19. A set of drive motors 17 is provided on one side of the drive wheels 16, which can then be driven by pulleys and synchronous pulleys to rotate the water cooling roller 18 and the surface coating roller 19. In addition, a rotary joint 20 is also installed on the outer side of one end of the shaft of the water cooling roller 18, so that the water cooling roller 18 can be connected to the external water supply end through the rotary joint 20 to circulate cooling water and cool the film three times.

[0043] It should be explained in detail that the bottom of the bearing 12 with seat on the inner side of the end of the bottom surface coating roller 19 is also equipped with a set of circular sliding guide rails 21 through the edge shifting plate, so as to realize the horizontal sliding of the surface coating roller 19 and adjust the distance between the water cooling roller 18 and the surface coating roller 19; and two sets of tensioning cylinders 22 are also provided below the guide rails to tension the surface coating roller 19 inward or outward; correspondingly, the top of the bearing 12 with seat on the inner side of the end of the surface coating roller 19 is also provided with a rotating screw 23, and the roller assembly is limited by rotating the knob at the end of the rotating screw 23.

[0044] Furthermore, two sets of metal rigid rollers 3 are arranged parallel to each other on the outer side of the non-powered transmission roller 203 for conveying the re-wrapped film. A set of follower rigid rollers 4 are correspondingly arranged on the top of the non-powered rigid rollers 3 via a movable connecting frame, and two sets of follower air cushion rollers 5 are also correspondingly arranged on the top of the non-powered transmission roller 203 via a fixed connecting frame. Specifically, one set of non-powered rigid rollers 3 is tangent to the parallel plane of the non-powered transmission roller 203, while the other set of non-powered rigid rollers 3 is tangent to the parallel plane of the follower air cushion rollers 5.

[0045] It should be explained in detail that when the film is fed from the bottom, it first passes through the passive transmission roller at the bottom, where it is guided and cooled once. Then, it passes through the main power transmission roller in the middle for traction and secondary cooling. Next, it passes through the unpowered transmission roller at the top for guidance and tertiary cooling. Finally, it passes through the following rigid roller and the following air cushion roller for guidance and traction, and the winding angle of the film is adjusted in conjunction with the rotating component.

[0046] Please continue reading. Figures 1-6 In this embodiment, an upper rotary support 6 is provided at the top of the rotating roller 2, and two sets of rotary gear sets 7 are coaxially arranged at the top and bottom of the upper rotary support 6. Specifically, the bottom rotary gear set 7 includes a first gear and a second gear, and the top rotary gear set 7 includes a third gear and a fourth gear.

[0047] Furthermore, a reversing box 8 is vertically positioned on one side of the rotary gear set 7, with its height located between the two rotary gear sets 7. Specifically, the reversing box 8 has a transmission ratio of 1:1 and is used only for changing direction.

[0048] It should be noted that the rotation angle range of the bottommost rotating support gear 1 is ±180°, the rotation angle range of the first gear and the rotating support base is ±90°, the rotation angle range of the second gear and the follower air cushion roller 5 mounted on the external fixed connecting frame of the second gear is ±135°, the rotation angle range of the reversing box 8 and the follower rigid roller 4 mounted on the movable connecting frame is ±90°, and the rotation angle range of the third gear and the follower air cushion roller 5 mounted on the external fixed connecting frame of the third gear is ±45°.

[0049] Understandably, during the blown film process, uneven film bubble thickness may lead to irregular protrusions or depressions on the film surface, resulting in "ripples." However, by rotating the die and the corresponding rotating roller 2, the film can be moved in the radial direction, thereby eliminating the "ripples" caused by uneven film bubble thickness. Similarly, when the film is wound up, wrinkles or deformations caused by uneven tension or speed mismatch can be evenly distributed by adjusting and controlling the rotation angle of different components.

[0050] Furthermore, the rotation angle range of the bottom rotating support gear 1 is ±180°, which helps to enhance the strength and uniformity of the plastic film. Through rotational motion, the film can be uniformly stressed in all directions, thereby improving its mechanical properties and appearance quality. By precisely controlling the rotation angle and tension of multiple sets of traction rollers, it is ensured that the film maintains appropriate tightness during winding, avoiding problems such as loose edges and uneven ends. Ultimately, this ensures smooth operation of the film during the winding process, thus protecting the film from damage.

[0051] Through the above technical solution, the drive motor unit of this application drives multiple sets of rotating rollers through belt drive drive wheel sets, which in turn pull and stretch the film with the helper rollers. The bottom rotating support gear and the top rotating drive gear rotate in conjunction with the reversing box to achieve precise control of rotation and traction during the film blowing process. This ensures that the film maintains a stable traction speed and tension during production, improves the uniformity and consistency of the film, and thus optimizes the physical properties of the film. It can also reduce the film cooling time and production cycle, thereby speeding up the production line. Furthermore, it can be flexibly adjusted according to different production needs, adapting to various types of film specifications and improving the flexibility and adaptability of the production line.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotary traction mechanism for heavy-duty blown film, characterized in that, include: A rotating support gear, above which are arranged multiple sets of parallel rotating rollers; The rotating roller includes a passive power transmission roller, a primary power transmission roller, and a non-powered transmission roller. A non-powered rigid roller is provided on the outside of the non-powered transmission roller, a follower rigid roller is provided on the top of the non-powered rigid roller, and a follower air cushion roller is provided on the top of the non-powered transmission roller. The top of the rotating roller is provided with an upper slewing support base, and a slewing gear set is coaxially arranged at the top and bottom of the upper slewing support base. A reversing box is provided on one side of the slewing gear set.

2. The rotary traction mechanism for blown film repacking according to claim 1, characterized in that, A rotary drive gear is provided on one side of the rotary support gear, and a rotary drive motor is provided on one side of the drive gear.

3. The rotary traction mechanism for blown film repacking according to claim 2, characterized in that, The top of the rotating support gear is symmetrically provided with mounting plates, and the end of the rotating roller is detachably mounted on the mounting plates.

4. The rotary traction mechanism for blown film repacking according to claim 3, characterized in that, The rotating roller is symmetrically provided with seated bearings at its ends, and the rotating roller is detachably connected to the mounting plate through the seated bearings.

5. The rotary traction mechanism for blown film repacking according to claim 4, characterized in that, A circular assembly plate is provided in the middle of the mounting plate, and the outer side of the end of the main power transmission roller is detachably connected to the circular assembly plate on the mounting plate via a seated bearing.

6. The rotary traction mechanism for blown film repacking according to claim 5, characterized in that, A support tube is provided on the top inner side of the circular assembly plate, and a non-powered rigid roller is provided on the bottom inner side of the circular assembly plate.

7. The rotary traction mechanism for blown film repacking according to claim 5, characterized in that, An angled gear is installed on the inner side of the circular mounting plate, and a drive wheel set is provided on the outer side of the mounting plate. Drive motor sets are provided on both sides of the drive wheel set, and the output end of the drive motor set is rotatably connected to the drive wheel set via a synchronous belt.

8. The rotary traction mechanism for blown film repacking according to claim 1, characterized in that, The active power transmission roller is disposed between the passive power transmission roller and the unpowered transmission roller. The passive power transmission roller includes a water-cooled roller and a surface-coated roller arranged in parallel. The active power transmission roller includes two sets of water-cooled rollers arranged in parallel. The unpowered transmission roller includes a water-cooled roller and a surface-coated roller arranged in parallel.

9. The rotary traction mechanism for blown film repacking according to claim 8, characterized in that, A rotary joint is provided on the outer side of the end of the water-cooling roller, and the water-cooling roller is connected to an external water supply end through the rotary joint.

10. The rotary traction mechanism for blown film repacking according to claim 8, characterized in that, The outer side of the end of the surface-coated roller is rotatably connected to the drive wheel assembly. A sliding guide rail is provided at the bottom of the bearing seat on the inner side of the end of the surface-coated roller. A tensioning cylinder is provided below the guide rail. A rotating screw is provided at the top of the bearing seat on the inner side of the end of the surface-coated roller.

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