A cooling air ring adjusting device for a film blowing machine

Abstract

The utility model relates to cooling air ring adjusting technical field especially, relates to a kind of cooling air ring adjusting device for blowing film machine processing packaging film, including air inlet frame, the inner wall of air inlet frame is rotatably connected with air inlet fan blade by mounting assembly, the outer wall of air inlet frame is fixedly installed with air outlet frame, the inner wall of air outlet frame is fixedly installed with processing frame, the center of processing frame is penetrated and is equipped with first air outlet, the inner wall of processing frame is fixedly installed with annular frame, and annular chamber is equipped in annular frame, the side of annular frame away from air inlet fan blade is equipped with second air outlet.The utility model sprays high-speed main wind by first air outlet and sprays low-speed auxiliary wind by second air outlet, realizes the overall cooling to bubble, improves the circumferential thickness uniformity of film, simultaneously, low-pressure air curtain formed by auxiliary wind can dynamically and stably wrap bubble, stably keep bubble in central position, effectively suppress the swing and drift of bubble, guarantee the stable production of high-quality film.

Description

Technical Field

[0001] This utility model relates to the field of cooling air ring adjustment technology, and in particular to a cooling air ring adjustment device for processing packaging film in a blown film machine. Background Technology

[0002] In the film blowing machine production process, the formation and cooling of the film bubble are crucial, directly affecting the thickness uniformity, transparency, and mechanical properties of the final packaging film. The cooling air ring is one of the core components of the film blowing machine, and its function is to uniformly and stably cool the high-temperature film bubble that has just been extruded from the die head through the blowing cooling airflow.

[0003] Currently, existing technologies mostly rely on a single airflow, which has a limited coverage area and a single flow pattern, making it impossible to achieve omnidirectional contact in the circumferential direction of the membrane bubble. This results in large differences in the forming rate of different areas of the membrane bubble, leading to poor uniformity of the film thickness around the circumference and a high scrap rate. At the same time, there is a lack of dynamic stabilization mechanism for the membrane bubble, and the airflow's support or wrapping effect on the membrane bubble is insufficient. Either the airflow impact force causes the membrane bubble to swing irregularly, or the poor wrapping makes the membrane bubble susceptible to external environmental influences and deviates from its central position. Ultimately, this leads to abnormal local thickness of the membrane bubble and frequent production fluctuations, resulting in poor practicality of the device. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing cooling air ring adjustment devices in terms of their poor practicality, and to propose a cooling air ring adjustment device for processing packaging film in a blown film machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cooling air ring adjustment device for processing packaging film in a blown film machine, comprising an air inlet frame, an air inlet fan blade rotatably connected to the inner wall of the air inlet frame via an installation assembly, an air outlet frame fixedly installed on the outer wall of the air inlet frame, a processing frame fixedly installed on the inner wall of the air outlet frame, a first air outlet being opened through the center of the processing frame, an annular frame being fixedly installed on the inner wall of the processing frame, and an annular cavity being opened inside the annular frame, a second air outlet being opened on the side of the annular frame away from the air inlet fan blade, and the second air outlet being located outside the first air outlet, a plurality of honeycomb elements arranged in a ring array being fixedly installed on the side of the annular frame facing the air inlet fan blade, a plurality of air inlets being opened through the outer wall of the annular frame, and vortex generating plates corresponding to the positions of the air inlets being fixedly installed on the inner wall.

[0006] Preferably, the mounting assembly includes a mounting frame fixedly mounted on the inner wall of the air intake frame, and the air intake fan blade is disposed within the mounting frame and rotatably connected to the mounting frame.

[0007] Preferably, a fixed frame is fixedly installed on the side of the air intake frame away from the air outlet frame, and a drive mechanism for driving the air intake fan blades to rotate is provided on the fixed frame.

[0008] Preferably, the drive mechanism includes a drive motor fixedly mounted on the top of the fixed frame, and a drive shaft coaxially fixedly connected to the inner wall of the fixed frame. The end of the drive shaft away from the intake fan blade is connected to the output end of the drive motor through a transmission device.

[0009] Preferably, a drive frame is fixedly installed on the outer wall of the fixed frame, and the transmission device is located inside the drive frame.

[0010] Preferably, both the inner and outer rings of the annular frame are fixedly connected to the processing frame with electrostrictive plates, and both electrostrictive plates correspond to the position of the second air outlet.

[0011] Compared with the prior art, the advantages of this utility model are:

[0012] 1. This utility model achieves comprehensive cooling of the membrane bubble by spraying high-speed main air from the first air outlet and low-speed auxiliary air from the second air outlet. The auxiliary air has controllable swirling characteristics and can "roll" along the surface of the membrane bubble, effectively removing heat from all directions, compensating for any cooling dead zones that may exist in the central main air, significantly improving the circumferential thickness uniformity of the film, and reducing the scrap rate. At the same time, the low-pressure air curtain formed by the auxiliary air can dynamically and stably wrap the membrane bubble, stabilizing it in the center position, effectively suppressing the swaying and drifting of the membrane bubble, avoiding local thickness imbalances caused by membrane bubble displacement, reducing fluctuations in the production process, and ensuring the stable production of high-quality films.

[0013] 2. This utility model adjusts the opening width of the second air outlet using an electrostrictive sheet, allowing for flexible control of airflow impact and concentration without requiring machine shutdown or manual adjustment. This improves production efficiency and flexibility. Widening the air outlet enhances the gentleness of the air curtain and increases the support area, making it suitable for the production of films sensitive to airflow impact. Narrowing the air outlet increases airflow concentration and impact, improving cooling efficiency, making it suitable for the production of thick films requiring rapid cooling. Simultaneously, the position of the frost line can be indirectly controlled by adjusting the air outlet, meeting the molding process requirements of different films and significantly improving the equipment's versatility.

[0014] 3. The honeycomb device in the annular cavity of this utility model can eliminate the rotation and lateral flow of the airflow, making the airflow straight; the vortex generator plate generates vortices, and the two airflows are fully mixed in the annular cavity, outputting a stable and fully homogenized auxiliary airflow, ensuring the uniformity and consistency of the air curtain, and further enhancing the stability of the membrane bubble. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a cooling air ring adjustment device for processing packaging film in a blown film machine, as proposed in this utility model.

[0016] Figure 2 This utility model presents a schematic diagram of the drive motor and transmission device for a cooling air ring adjustment device used in blown film processing and packaging film.

[0017] Figure 3 This is a cross-sectional view of the processing frame of a cooling air ring adjustment device for processing packaging film in a blown film machine, as proposed in this utility model.

[0018] Figure 4 for Figure 3 A magnified view showing the details at point A in the middle.

[0019] In the diagram: 1. Fixed frame, 2. Inlet frame, 3. Drive motor, 4. Drive frame, 5. Transmission device, 6. Drive shaft, 7. Mounting frame, 8. Inlet fan blade, 9. Outlet frame, 10. First outlet, 11. Second outlet, 12. Annular cavity, 13. Honeycomb unit, 14. Vortex generator, 15. Inlet hole, 16. Electrostrictive plate, 17. Processing frame. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1 to 4 A cooling air ring adjustment device for processing packaging film in a blown film machine includes a fixed frame 1. An air inlet frame 2 and a drive frame 4 are fixedly installed on the outer wall of the fixed frame 1, and a drive motor 3 is fixedly installed on the top. A drive shaft 6 is rotatably connected to the inner wall. An installation frame 7 is fixedly installed on the inner wall of the air inlet frame 2, and an air inlet fan blade 8 is rotatably connected to the inner wall of the installation frame 7. The drive shaft 6 is connected to the output end of the drive motor 3 via a transmission device 5, which is located inside the drive frame 4. The end of the drive shaft 6 away from the transmission device 5 is coaxially fixedly connected to the rotating shaft of the air inlet fan blade 8. An air outlet frame 9 is fixedly installed on the side of the air inlet frame 2 away from the fixed frame 1. A processing frame 17 is fixedly installed on the inner wall of the air outlet frame 9, and a first air outlet is opened through the center of the processing frame 17. The inner wall of the inlet 10 is also fixedly installed with an annular frame. After the drive motor 3 is started, the motor drives the drive shaft 6 to rotate through the transmission device 5 in the drive frame 4. The drive shaft 6 further drives the intake fan blade 8 in the mounting frame 7 to rotate. The transmission device 5 is set in the drive frame 4, and the external interference is isolated by the closed space. At the same time, the drive frame 4 provides stable support for the transmission components, ensuring that the power of the drive motor 3 can be smoothly transmitted to the drive shaft 6, thereby driving the intake fan blade 8 to rotate at a uniform speed, ensuring the continuity and stability of airflow output, and reducing the production deviation caused by transmission fluctuations from the source. The rotation of the intake fan blade 8 generates airflow. Most of the airflow is directly ejected from the first air outlet 10 in the center of the processing frame 17, and the other part enters the interior of the processing frame 17.

[0022] An annular cavity 12 is formed inside the annular frame. A second annular air outlet 11 is formed on the side of the annular frame away from the intake fan blade 8, and the second air outlet 11 is located outside the first air outlet 10. Electrostrictive plates 16 are fixedly connected to the processing frame 17 on both the inner and outer rings of the annular frame. The two electrostrictive plates 16 correspond to the positions of the second air outlet 11. Multiple honeycomb cells 13 arranged in a ring array are fixedly installed on the side of the annular frame facing the intake fan blade 8. Multiple air inlets 15 are formed through the outer wall of the annular frame, and cells corresponding to the positions of the air inlets 15 are fixedly installed on the inner wall. The corresponding vortex generator 14 is placed, and the airflow entering the processing frame 17 is divided into two paths: one path passes through the honeycomb 13 and enters the annular cavity 12. The honeycomb 13 can eliminate the rotation and lateral flow of the airflow, making it straight; the other path enters the annular cavity 12 from the air inlet 15 on the outside of the annular frame, and the airflow will first contact the vortex generator 14 and generate vortices when it enters. The two airflows are fully and quickly mixed in the annular cavity 12, and finally ejected from the second air outlet 11, forming a well-homogenized, pressure-stable auxiliary airflow containing controllable swirling components.

[0023] The electrostrictive sheet 16 can expand and contract after being energized, thereby adjusting the opening width of the second air outlet 11: when the opening width of the second air outlet 11 is widened, the softness of the air curtain is improved, its support area for the membrane bubble is increased, but the airflow impact force is reduced, resulting in a higher frost line position; when the opening width of the second air outlet 11 is narrowed, the airflow concentration is increased, the airflow impact force is enhanced, the cooling efficiency is improved, and thus the frost line position is lowered. The central main air output from the first air outlet 10 is a high-speed and highly cooling "cooling air", while the peripheral auxiliary air output from the second air outlet 11 is a lower-speed and rotating "stabilizing air". Among them, the rotating auxiliary air forms a dynamic and stable low-pressure air curtain around the membrane bubble. This low-pressure air curtain can wrap around the membrane bubble and stabilize it in the center position, effectively suppressing the swaying and drifting of the membrane bubble and ensuring the production of high-quality films. In addition, the peripheral auxiliary wind can utilize its swirling characteristics to ensure that it flows forward in a "rolling" manner along the surface of the membrane bubble, thereby carrying away heat from all directions of the membrane bubble, compensating for any cooling dead zones that may exist in the central main wind, and ultimately significantly improving the circumferential thickness uniformity of the membrane.

[0024] In operation, the drive motor 3 is first started. The drive motor 3 drives the drive shaft 6 to rotate through the transmission device 5 in the drive frame 4. The drive shaft 6 drives the intake fan blade 8 in the mounting frame 7 to rotate. The airflow generated by the rotation of the intake fan blade 8 is ejected from the middle of the intake fan blade 8. Most of the airflow is ejected from the first air outlet 10 in the middle of the processing frame 17, and a portion of the airflow enters the processing frame 17. A portion of the airflow entering the processing frame 17 passes through the honeycomb 13 and enters the annular cavity 12. The honeycomb 13 eliminates the rotation and lateral flow of the incoming airflow. This straightens the airflow, and a portion of the airflow enters the annular cavity 12 through the air inlet 15. The airflow entering through the air inlet 15 will first contact the vortex generator plate 14 on the inner wall of the annular cavity 12 to generate vortices, allowing the airflow entering from the honeycomb unit 13 and the air inlet 15 to mix more fully and quickly. Finally, the air blown out from the annular cavity 12 is an auxiliary airflow that has been fully homogenized, has stable pressure, and has a controllable swirling component. The electrostrictive plate 16 installed above the processing frame 17 and the annular cavity 12 can extend and retract after being energized, thereby controlling the width of the second air outlet 11.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cooling air ring adjustment device for processing packaging film in a blown film machine, comprising an air inlet frame (2), characterized in that, The inner wall of the air intake frame (2) is rotatably connected to the air intake fan blade (8) via the mounting assembly. The outer wall of the air intake frame (2) is fixedly installed with the air outlet frame (9). The inner wall of the air outlet frame (9) is fixedly installed with the processing frame (17). The center of the processing frame (17) is provided with a first air outlet (10). The inner wall of the processing frame (17) is fixedly installed with an annular frame, and an annular cavity (12) is provided inside the annular frame. The side of the annular frame away from the air intake fan blade (8) is provided with a second air outlet (11), and the second air outlet (11) is located outside the first air outlet (10). The side of the annular frame facing the air intake fan blade (8) is fixedly installed with a plurality of honeycomb elements (13) arranged in an annular array. The outer wall of the annular frame is provided with a plurality of air inlets (15), and the inner wall is fixedly installed with vortex generators (14) corresponding to the positions of the air inlets (15).

2. The cooling air ring adjustment device for processing packaging film in a blown film machine according to claim 1, characterized in that, The mounting assembly includes a mounting frame (7) fixedly mounted on the inner wall of the air intake frame (2), and the air intake fan blade (8) is disposed in the mounting frame (7) and rotatably connected to the mounting frame (7).

3. The cooling air ring adjustment device for processing packaging film in a blown film machine according to claim 1, characterized in that, A fixed frame (1) is fixedly installed on the side of the air intake frame (2) away from the air outlet frame (9), and a drive mechanism for driving the air intake fan blade (8) to rotate is provided on the fixed frame (1).

4. The cooling air ring adjustment device for processing packaging film in a blown film machine according to claim 3, characterized in that, The drive mechanism includes a drive motor (3) fixedly installed on the top of the fixed frame (1). The inner wall of the fixed frame (1) is rotatably connected to a drive shaft (6) that is coaxially fixedly connected to the shaft of the intake fan (8). The end of the drive shaft (6) away from the intake fan (8) is connected to the output end of the drive motor (3) through a transmission device (5).

5. The cooling air ring adjustment device for processing packaging film in a blown film machine according to claim 4, characterized in that, The outer wall of the fixed frame (1) is fixedly installed with a drive frame (4), and the transmission device (5) is located inside the drive frame (4).

6. The cooling air ring adjustment device for processing packaging film in a blown film machine according to claim 1, characterized in that, The inner and outer rings of the annular frame are both fixedly connected to the processing frame (17) with electrostrictive plates (16), and the two electrostrictive plates (16) are both positioned corresponding to the second air outlet (11).

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