An extrusion molding device for a blown film machine

Abstract

This utility model relates to the field of extrusion molding technology and discloses an extrusion molding device for a blown film machine, including a support plate, an extruder fixedly connected to the top of the support plate, a support frame one fixedly connected to the top of the support plate, a support platform fixedly connected to the top of the support plate, a winding assembly disposed inside the support platform, a support frame two fixedly connected to the top of the support frame one, a support frame fixedly connected to the top of the support frame two, a traction assembly disposed on the top of the support frame, a herringbone clamp fixedly connected inside the support frame two, and a limit frame fixedly connected to one side wall of the support frame. In this utility model, an electric push rod drives a sliding block one to slide within the sliding groove of the limit frame, and the sliding block one drives the tension roller to move, thereby achieving a stable conveying and winding effect, solving the problems of film accumulation caused by looseness and damage caused by excessive tension, and improving the stability of the device operation and the quality and safety of the film.

Description

Technical Field

[0001] This utility model relates to the field of extrusion molding technology, and in particular to an extrusion molding device for a blown film machine. Background Technology

[0002] The extrusion molding unit of a blown film machine is the core equipment in a plastic film production line, its technology stemming from the growing demand in modern industry for high-performance film materials. This unit forms film bubbles from molten plastic through an extruder head, followed by cooling, traction, and winding processes to create the final film, which is widely used in packaging, agriculture, and medical fields. As film production processes become increasingly high-speed and precise, higher demands are placed on the stability of the molding process and the quality of the film. Traditional extrusion molding units face technical bottlenecks in film conveying and tension control, especially under high-speed production conditions where tension fluctuations can easily lead to surface defects or decreased mechanical properties. Therefore, optimized structural design is needed to improve film molding quality and production efficiency.

[0003] Existing blown film extrusion molding units typically employ a mechanical tension control system, whose structure mainly consists of an extruder, air ring, herringbone plate, traction roller, and winding mechanism. The technical principle lies in providing basic traction force through a motor-driven traction roller, and maintaining film tension balance using a friction clutch or counterweight mechanism.

[0004] The main problem with existing technologies is the tendency for tension control to become inaccurate during the film conveying and winding process. Traditional mechanical tension systems lack dynamic response capabilities and cannot compensate in real time for the elastic deformation of the film caused by temperature changes and thickness fluctuations. This leads to the film sometimes being over-tensioned, resulting in tensile deformation or even breakage, and sometimes being under-tensioned, causing wrinkles and buildup. This tension instability not only causes unevenness on the film roll surface, affecting subsequent slitting, but also damages the film's mechanical properties, creating hidden quality defects. This has become a key technical challenge restricting the improvement of yield in high-speed blown film production lines. Therefore, an extrusion molding device for a blown film machine is proposed to solve these problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an extrusion molding device for a blown film machine, which aims to improve the problem of tension control inaccuracy that easily occurs during the conveying and winding process of films in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An extrusion molding device for a blown film machine includes a support plate, an extruder fixedly connected to the top of the support plate, a support frame one fixedly connected to the top of the support plate, a support platform fixedly connected to the top of the support plate, a winding assembly disposed inside the support platform, a support frame two fixedly connected to the top of the support frame one, a support frame fixedly connected to the top of the support frame two, a traction assembly disposed on the top of the support frame, a herringbone clamp fixedly connected inside the support frame two, a limit frame fixedly connected to one side wall of the support frame, and a tensioning assembly disposed inside the limit frame.

[0008] The tensioning assembly includes a sliding block and a tensioning roller. The sliding block is slidably connected inside the limiting frame. One end of the tensioning roller is fixedly connected inside the sliding block. A buffer assembly is provided inside the limiting frame. A driving assembly is provided inside the limiting frame. A fixing frame is fixedly connected inside the support platform. A cleaning assembly is provided inside the fixing frame.

[0009] Through the above technical solutions, the overall framework of the device was constructed, and the layout and subordinate relationships of core functional modules such as extruder, support structure, winding, traction, herringbone clamp, tensioning and cleaning were clarified.

[0010] Preferably, the winding assembly includes a motor and a traction roller. The outer wall of the motor is fixedly connected to the side wall of the support frame, and one end of the traction roller is fixedly connected to the output end of the motor. A sliding groove is provided inside the limiting frame, and a sliding block is slidably connected to the inner wall of the sliding groove. A triangular support frame is fixedly connected to the bottom of the limiting frame, and the side wall of the triangular support frame is fixedly connected to one side wall of the support frame.

[0011] The above technical solution establishes the source of traction power, the motor, and the traction roller, the actuator. The linearity of the tensioning assembly's movement is ensured by the sliding groove, while the structural rigidity and stability of the limit frame and the entire tensioning system are enhanced by the use of a triangular support frame.

[0012] Preferably, the winding assembly includes a winding roller rotatably connected to the top of the support platform, and the driving assembly includes an electric push rod, the outer wall of which is fixedly connected to the inside of the support frame, and one side wall of the sliding block is fixedly connected to the output end of the electric push rod.

[0013] The above technical solution defines the winding roller as the execution component for winding and specifically explains that the drive assembly uses an electric push rod as the power source to directly drive the sliding block to control the position of the tension roller, thereby realizing the active adjustment of film tension.

[0014] Preferably, the buffer assembly includes a spring, one end of which is fixedly connected to one side wall of the sliding block, and the other end of which is fixedly connected to the inner wall of the limiting frame.

[0015] The above technical solution uses a spring to connect a sliding block and a limiting frame, forming a buffer mechanism that can effectively absorb and compensate for instantaneous fluctuations in tension, providing elastic support for the film and preventing excessive tension from damaging the film or insufficient tension from causing it to loosen.

[0016] Preferably, the cleaning assembly includes a lower cleaning roller and an upper cleaning roller, both of which are rotatably connected inside the fixed frame. A second support rod is rotatably connected inside the fixed frame. The inner wall of the lower cleaning roller is fixedly connected to the outer wall of the second support rod. A second motor is fixedly connected to the side wall of the fixed frame, and one end of the second support rod is fixedly connected to the output end of the second motor.

[0017] The above technical solution provides the power for the rotation and cleaning of the lower cleaning roller driven by motor 2, clarifies the basic installation method of the upper and lower cleaning rollers, and provides a structural basis for realizing active cleaning of the lower surface of the film.

[0018] Preferably, a second sliding block is slidably connected inside the fixed frame, a first support rod is fixedly connected inside the second sliding block, and the upper cleaning roller is rotatably connected to the outer wall of the first support rod.

[0019] Through the above technical solution, the connection between the sliding block 2 and the support rod 1 allows the upper cleaning roller to slide vertically, giving it a high degree of adaptability and enabling it to automatically adjust the clamping gap according to films of different thicknesses.

[0020] Preferably, a sliding column is fixedly connected to the top of the second sliding block, the sliding column is slidably connected inside the fixed frame, a limiting plate is fixedly connected to the outer wall of the sliding column, and the bottom of the limiting plate is in contact with the top of the fixed frame.

[0021] The above technical solution, through the cooperation of the sliding column and the limiting plate, not only guides the vertical movement trajectory of the upper cleaning roller group, but also limits its lowest downward position, preventing excessive pressure on the film and ensuring the stability and controllability of the cleaning process.

[0022] Preferably, a second spring is sleeved on the outer wall of the sliding column, one end of the second spring is fixedly connected to the top of the second sliding block, and the other end of the second spring is fixedly connected to the inner wall of the fixed frame.

[0023] Through the above technical solution, the spring provides a continuous downward elastic force to the sliding block, ensuring that the upper cleaning roller can effectively adhere to the film surface and apply stable cleaning pressure, thereby ensuring the effective removal of impurities from the film surface.

[0024] This utility model has the following beneficial effects:

[0025] 1. In this utility model, an electric push rod drives a sliding block to slide within the sliding groove of a limiting frame. The sliding block drives the tension roller to move, ensuring that the tension roller is always in contact with and supports the film. Subsequently, a spring deforms as the sliding block moves, buffering the force applied to the tension roller. This ensures that the film remains in a stable tension state during conveying and winding, preventing accumulation due to looseness and avoiding damage to the film due to excessive tension. This achieves a stable conveying and winding effect, solving the problems of accumulation caused by loose film and damage caused by excessive tension, and improving the stability of the device operation and the quality and safety of the film.

[0026] 2. In this utility model, the second motor drives the second support rod to rotate, which in turn drives the lower cleaning roller to rotate. Subsequently, the upper cleaning roller is connected to the second sliding block via the first support rod. Under the elastic force of the second spring, the second sliding block drives the upper cleaning roller to move downward, allowing the upper cleaning roller to adaptively adjust the distance between itself and the lower cleaning roller according to the film thickness. This enables the upper and lower cleaning rollers to fully adhere and clean the upper and lower surfaces of the formed film, effectively removing surface impurities and thus improving the cleanliness of the film. This solves the problem of surface impurities affecting product quality and improves the applicability of the device and the quality of the finished film. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of an extrusion molding device for a blown film machine according to the present invention;

[0028] Figure 2 This is a schematic diagram of the herringbone clamp structure of the extrusion molding device for a blown film machine according to the present invention.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic diagram of the take-up roller structure of the extrusion forming device of a blown film machine according to the present invention;

[0031] Figure 5 This is a schematic diagram of the fixed frame structure of the extrusion molding device of a blown film machine proposed in this utility model;

[0032] Figure 6 This is a schematic diagram of the sliding block two structure of the extrusion molding device of a blown film machine proposed in this utility model.

[0033] Legend:

[0034] 1. Support plate; 2. Support frame one; 3. Support platform; 4. Support frame two; 5. Support frame; 6. Motor one; 7. Traction roller; 8. Extruder; 9. Herringbone clamp; 10. Electric push rod; 11. Triangular support frame; 12. Limiting frame; 13. Spring one; 14. Sliding block one; 15. Sliding groove; 16. Take-up roller; 17. Fixing frame; 18. Motor two; 19. Lower cleaning roller; 20. Sliding column; 21. Spring two; 22. Limiting plate; 23. Sliding block two; 24. Support rod one; 25. Support rod two; 26. Upper cleaning roller; 27. Tensioning roller. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figure 1 - Figure 3 An extrusion molding device for a blown film machine includes a support plate 1, an extruder 8 fixedly connected to the top of the support plate 1 for melting and extruding raw materials to form a film bubble, a support frame 2 fixedly connected to the top of the support plate 1 for providing main support, a support platform 3 fixedly connected to the top of the support plate 1 for supporting a winding mechanism, a winding assembly inside the support platform 3 for winding the formed film, a support frame 4 fixedly connected to the top of the support frame 2 for lifting and fixing the upper structure, a support frame 5 fixedly connected to the top of the support frame 4 for installing traction components, a traction assembly on the top of the support frame 5 for traction and conveying the film, a herringbone clamp 9 fixedly connected inside the support frame 4 for folding and initially shaping the film bubble, and a limit frame 12 fixedly connected to the side wall of the support frame 2 for limiting and guiding the movement trajectory of the tensioning mechanism, a tensioning assembly inside the limit frame 12 for adjusting and maintaining the tension of the film.

[0037] The tensioning assembly includes a sliding block 14 and a tensioning roller 27. The sliding block 14 is slidably connected inside the limiting frame 12 to provide a linear movement basis. One end of the tensioning roller 27 is fixedly connected inside the sliding block 14 to directly contact and support the film. A buffer assembly is provided inside the limiting frame 12 to absorb the impact caused by tension fluctuations. A drive assembly is provided inside the limiting frame 12 to provide active driving force to control the position of the tensioning roller 27. A fixing frame 17 is fixedly connected inside the support platform 3 to accommodate and fix the cleaning mechanism. A cleaning assembly is provided inside the fixing frame 17 to remove impurities from the film surface. The winding assembly includes a motor 6 and a traction roller 7. The outer wall of the motor 6 is fixedly connected to the side wall of the support frame 5 to provide rotational power. One end of the traction roller 7 is fixedly connected to the output end of the motor 6 to clamp and pull the film. A sliding groove 15 is provided inside the limiting frame 12 to precisely guide the movement path of the sliding block 14. Sliding block 14 is slidably connected to the inner wall of sliding groove 15 to achieve stable sliding. A triangular support frame 11 is fixedly connected to the bottom of the limiting frame 12 to enhance the structural stability of the limiting frame 12. The side wall of the triangular support frame 11 is fixedly connected to the side wall of the support frame 2 to achieve force transmission. The winding assembly includes a winding roller 16 for finally winding the film product. The winding roller 16 is rotatably connected to the top of the support platform 3 to complete the winding operation. The drive assembly includes an electric push rod 10 to provide precise linear displacement output. The outer wall of the electric push rod 10 is fixedly connected to the inside of the support frame 2 for stable installation. The side wall of sliding block 14 is fixedly connected to the output end of the electric push rod 10 for direct controlled movement. The buffer assembly includes a spring 13 to provide elastic buffering force. One end of the spring 13 is fixedly connected to the side wall of sliding block 14 to sense its position change. The other end of the spring 13 is fixedly connected to the inner wall of the limiting frame 12 to form a reaction force fulcrum.

[0038] Reference Figure 4 - Figure 6The cleaning assembly includes a lower cleaning roller 19 and an upper cleaning roller 26. Both the lower and upper cleaning rollers 19 and 26 are rotatably connected inside a fixed frame 17 to form a relative rotation structure. A second support rod 25 is rotatably connected inside the fixed frame 17 to provide the mounting base and rotation axis for the lower cleaning roller 19. The inner wall of the lower cleaning roller 19 is fixedly connected to the outer wall of the second support rod 25 to achieve power transmission and synchronous rotation. A second motor 18 is fixedly connected to the side wall of the fixed frame 17 to provide the driving power required for the rotation of the cleaning roller. One end of the second support rod 25 is fixedly connected to the output end of the second motor 18 to directly receive torque drive. A second sliding block 23 is slidably connected inside the fixed frame 17 to provide a vertical moving platform. A first support rod 24 is fixedly connected inside the second sliding block 23 for mounting. The upper cleaning roller 26 is rotatably connected to the outer wall of the support rod 24 to achieve driven rotation. The top of the sliding block 23 is fixedly connected to the sliding column 20 to guide the vertical movement of the sliding block and transmit pressure. The sliding column 20 is slidably connected inside the fixed frame 17 to limit the movement trajectory and ensure vertical lifting. The outer wall of the sliding column 20 is fixedly connected to the limiting plate 22 to limit the stroke of the sliding column 20 and prevent it from falling out. The bottom of the limiting plate 22 is attached to the top of the fixed frame 17 to determine the initial position. The outer wall of the sliding column 20 is fitted with the spring 21 to provide continuous downward pressure. One end of the spring 21 is fixedly connected to the top of the sliding block 23 to sense position changes, and the other end of the spring 21 is fixedly connected to the inner wall of the fixed frame 17 to form a fixed reaction force fulcrum.

[0039] Working principle: The extruder 8 extrudes the raw material into a film. The film is first pre-formed by the herringbone clamp 9 inside the support frame 2 4. Then, the film enters the tensioning assembly inside the limiting frame 12. The electric push rod 10 drives the sliding block 14 to slide in the sliding groove 15 of the limiting frame 12. The sliding block 14 drives the tension roller 27 to move, so that the tension roller 27 contacts and supports the film. At the same time, when the sliding block 14 moves, it causes the spring 13 to deform, which buffers the force of the tension roller 27. The limiting frame 12 is stably connected to the support frame 2 1 through the triangular support frame 11. Then, the film enters the fixing frame 17 inside the support platform 3. The cleaning component is driven by motor 218 to rotate support rod 25, which in turn drives the lower cleaning roller 19 to rotate. Simultaneously, sliding block 23, under the elastic force of spring 21, drives sliding column 20 to slide within fixed frame 17. Sliding block 23 drives upper cleaning roller 26 to move via support rod 124, so that upper cleaning roller 26 adjusts the distance between itself and lower cleaning roller 19 according to the film thickness and adheres to the film. Limiting plate 22 limits sliding column 20. Then, the film is pulled by traction component at the top of support frame 5, and traction is achieved by motor 16 driving traction roller 7 to rotate. Finally, the film is wound up by winding roller 16 at the top of support platform 3.

Claims

1. An extrusion forming device of a film blowing machine comprising a support plate (1), characterized in that: The top of the support plate (1) is fixedly connected to an extruder (8), the top of the support plate (1) is fixedly connected to a support frame one (2), the top of the support plate (1) is fixedly connected to a support platform (3), the support platform (3) is provided with a winding assembly, the top of the support frame one (2) is fixedly connected to a support frame two (4), the top of the support frame two (4) is fixedly connected to a support frame (5), the top of the support frame (5) is provided with a traction assembly, the support frame two (4) is fixedly connected to a herringbone clamp (9), the side wall of the support frame one (2) is fixedly connected to a limit frame (12), the limit frame (12) is provided with a tensioning assembly; The tensioning assembly includes a sliding block (14) and a tensioning roller (27). The sliding block (14) is slidably connected inside the limiting frame (12). One end of the tensioning roller (27) is fixedly connected inside the sliding block (14). A buffer assembly is provided inside the limiting frame (12). A driving assembly is provided inside the limiting frame (12). A fixed frame (17) is fixedly connected inside the support platform (3). A cleaning assembly is provided inside the fixed frame (17).

2. The extrusion device of a film blowing machine according to claim 1, characterized in that: The winding assembly includes a motor (6) and a traction roller (7). The outer wall of the motor (6) is fixedly connected to the side wall of the support frame (5). One end of the traction roller (7) is fixedly connected to the output end of the motor (6). A sliding groove (15) is provided inside the limiting frame (12). The sliding block (14) is slidably connected to the inner wall of the sliding groove (15). A triangular support frame (11) is fixedly connected to the bottom of the limiting frame (12). The side wall of the triangular support frame (11) is fixedly connected to the side wall of the support frame (2).

3. The extrusion device of a film blowing machine according to claim 1, characterized in that: The winding assembly includes a winding roller (16), which is rotatably connected to the top of the support platform (3). The drive assembly includes an electric push rod (10), the outer wall of which is fixedly connected to the inside of the support frame (2), and the side wall of the sliding block (14) is fixedly connected to the output end of the electric push rod (10).

4. The extrusion device of claim 1, wherein: The buffer assembly includes a spring (13), one end of which is fixedly connected to the side wall of the sliding block (14), and the other end of which is fixedly connected to the inner wall of the limiting frame (12).

5. The extrusion device of a film blowing machine according to claim 1, characterized in that: The cleaning assembly includes a lower cleaning roller (19) and an upper cleaning roller (26). The lower cleaning roller (19) and the upper cleaning roller (26) are rotatably connected inside the fixed frame (17). A second support rod (25) is rotatably connected inside the fixed frame (17). The inner wall of the lower cleaning roller (19) is fixedly connected to the outer wall of the second support rod (25). A second motor (18) is fixedly connected to the side wall of the fixed frame (17). One end of the second support rod (25) is fixedly connected to the output end of the second motor (18).

6. The extrusion device of a film blowing machine according to claim 5, characterized in that: The fixed frame (17) has a sliding block two (23) inside, and a support rod one (24) is fixedly connected inside the sliding block two (23). The upper cleaning roller (26) is rotatably connected to the outer wall of the support rod one (24).

7. The extrusion device of a film blowing machine according to claim 6, characterized in that: The top of the sliding block 2 (23) is fixedly connected to a sliding column (20), which is slidably connected inside the fixed frame (17). The outer wall of the sliding column (20) is fixedly connected to a limiting plate (22), and the bottom of the limiting plate (22) is in contact with the top of the fixed frame (17).

8. The extrusion molding apparatus for a blown film machine according to claim 7, characterized in that: The outer wall of the sliding column (20) is fitted with a spring (21). One end of the spring (21) is fixedly connected to the top of the sliding block (23), and the other end of the spring (21) is fixedly connected to the inner wall of the fixed frame (17).

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