A blown film airflow type air ring that can be adjusted by a flexible variable medium

Abstract

This invention discloses a blown film airflow regulating air ring with flexible variable medium adjustment, relating to the field of thin film production equipment technology. It includes a base, a lower air ring and an upper air ring mounted on top of the base. An air duct is pre-formed between the lower and upper air rings. An adjustment mechanism is installed inside the air duct. The adjustment mechanism includes several motor brackets mounted on top of the upper air ring. Each motor bracket has a fixed-axis stepper motor fixedly mounted on its top. An adjustment block is fixedly mounted at the end of each fixed-axis stepper motor via a pin. The outer sides of several adjustment blocks are jointly fixedly connected to a titanium alloy frame. The adjustment mechanism also includes a direction control mechanism for adjusting the airflow pattern. This invention discloses a blown film airflow regulating air ring with flexible variable medium adjustment, which offers multifunctionality and high stability.

Description

Technical Field

[0001] This invention relates to the field of thin film production equipment technology, and in particular to a blown film airflow type air ring that adjusts the airflow through a flexible variable medium. Background Technology

[0002] The blown film airflow type air ring is a key component in the plastic blown film production line. It controls the cooling speed and stability of the plastic bubble tube by blowing a precisely adjustable cooling airflow into the molten plastic bubble tube that has just been extruded from the die, thereby ensuring the uniformity of the plastic film thickness and the quality of the product.

[0003] The outlet gap of traditional air rings is not easy to adjust. They are difficult to disassemble and reassemble, and it is also difficult to achieve uniform air delivery. This leads to "thin areas" and "thick areas" on the membrane bubble, resulting in a larger thickness tolerance of the final film, and even causing the membrane to deform and break. In addition, traditional air rings cannot change the type of air outlet, so they cannot be adapted to the production needs of different products, and have functional shortcomings. Summary of the Invention

[0004] This invention discloses a blown film airflow type air ring that is adjustable by a flexible variable medium. It aims to solve the technical problems of traditional air rings, where the outlet gap is fixed or rigidly adjustable, making it difficult to disassemble and assemble, achieve absolutely uniform airflow around the circumference, and change the type of airflow, thus having functional shortcomings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A blown film airflow type air ring with adjustable flexible variable medium includes a base, a lower air ring and an upper air ring mounted on the top of the base. An air duct is reserved between the lower air ring and the upper air ring. An adjustment mechanism for controlling the airflow is provided inside the air duct. The adjustment mechanism includes several motor brackets arranged in a ring and mounted on the top of the upper air ring. A fixed-axis stepper motor is fixedly mounted on the top of each motor bracket. The end of the fixed-axis stepper motor extends horizontally into the interior of the upper air ring and is fixedly mounted with an adjustment block by a pin. The outer sides of several adjustment blocks are fixedly connected to a titanium alloy frame.

[0007] The regulating mechanism is internally equipped with a directional control mechanism for adjusting the airflow pattern. The directional control mechanism includes an air passage opened inside each regulating block, an air cavity opened inside each titanium alloy frame, and several spiral plates slidably installed on the outside of each air cavity.

[0008] The thermoplastic film is shaped by blowing a stable airflow into the interior of the base through the air duct, and the flow rate and direction of the airflow are adapted and controlled by the operation of the adjustment mechanism and the direction control mechanism.

[0009] By incorporating an adjustment mechanism into the airflow ring, located at the gap in the air duct, the mechanism generates a controllable curved deformation through a driving force, forming an aerodynamic windward curved surface. This reduces film surface fluctuations caused by abrupt changes in the point-to-point adjustment of conventional airflow outlets. Furthermore, based on real-time thickness measurement feedback, the gap size of the outlet at the corresponding position can be changed, enabling independent circumferential or synchronous full-circumferential airflow adjustment. In addition, the additional directional control mechanism can change the direction of the gas flow through the air duct according to the volume of the blown film, generating both straight and spiral airflows. This rotating airflow can more gently and evenly surround the film bubble, avoiding localized overcooling or overheating, and greatly improving cooling uniformity and stability while maintaining thermoplastic efficiency.

[0010] In a preferred embodiment, several titanium alloy frames are arranged in a ring along the interior of the air duct, and an elastic silicone ring is fitted onto the outer side of several titanium alloy frames.

[0011] By incorporating an elastic silicone ring structure driven by a fixed-axis stepper motor within the air duct, the gap at the air outlet is adjusted through the movement of the titanium alloy frame in conjunction with the deformation of the elastic silicone ring. Compared to traditional airflow-type air rings, this method offers a gradual change in adjustment, reducing deviations. The elastic silicone ring undergoes controllable curved deformation under stress, forming an aerodynamic windward surface, minimizing film surface fluctuations caused by abrupt point-to-point adjustments in conventional airflow outlets. Simultaneously, based on real-time thickness measurement feedback, the fixed-axis stepper motor at the corresponding position receives an electrical signal, thereby driving the elastic silicone ring to elastically deform from its zero position, changing the corresponding position... The size of the air duct gap allows for independent circumferential or synchronous full-circumferential airflow adjustment. The elastic silicone ring is lightweight and soft, and compared to fluororubber, silicone has a wider temperature range. Furthermore, under the same thickness, silicone has better tensile strength than fluororubber, resulting in lower adjustment resistance. This allows for a smaller fixed-axis stepper motor, making the overall structure lighter and more compact. The fixed-axis stepper motors at each point are modularly installed; if damaged, only the corresponding module needs to be replaced, facilitating easy disassembly and assembly while maintaining low costs and providing convenient operation. Additionally, the elastic silicone ring provides airflow buffering and shock absorption during adjustment, reducing equipment noise.

[0012] In a preferred embodiment, the air passage and the air cavity are connected in a continuous manner, and the spiral plate presses against the inner side of the elastic silicone ring.

[0013] By adding air ducts and air chambers to the titanium alloy skeleton and adjusting blocks, high-pressure gas is introduced into the air chamber as needed, which in turn pushes the spiral plate inside the air chamber to move horizontally outward. While moving, the spiral plate pushes the elastic silicone ring, causing the surface of the elastic silicone ring to deform and generate spiral patterns. The patterns change the airflow direction inside the air duct, generating both straight and spiral airflow. This rotating airflow can more gently and evenly surround the bubble, avoiding local overcooling or overheating. While maintaining thermoplastic efficiency, it greatly improves cooling uniformity and stability.

[0014] In a preferred embodiment, a hinge interface is provided through the interior of the adjusting block, and the output end of the fixed-axis stepper motor and the adjusting block are fixedly connected through the hinge interface and a pin.

[0015] By setting a hinge interface structure at the end of the adjustment block, the output end of the fixed-axis stepper motor is pressed and fixed by a pin in conjunction with the hinge interface, thereby allowing the position of the adjustment block to be adjusted autonomously and improving functionality.

[0016] In a preferred embodiment, the outer surface of the elastic silicone ring is provided with rounded corners at both the upper and lower ends, and the rounded corners are distributed inside the air duct. The bottom of each spiral plate is provided with an arc edge.

[0017] By setting rounded corner plates and arc-shaped edge structures at the ends of the elastic silicone ring and the spiral plate respectively, the stability of airflow movement is greatly improved by utilizing the flexible edge arc.

[0018] As can be seen from the above, the blown film airflow type air ring provided by the present invention, which is adjusted by a flexible variable medium, has the following technical effects.

[0019] Firstly, by incorporating an elastic silicone ring structure driven by a fixed-axis stepper motor within the air duct, the gap at the air outlet is adjusted through the movement of the titanium alloy frame in conjunction with the deformation of the elastic silicone ring. Compared to traditional airflow-type air rings, this design offers a gradual change in adjustment, reducing deviations. The elastic silicone ring undergoes controllable curved deformation under stress, forming an aerodynamic windward surface and minimizing film surface fluctuations caused by abrupt point-to-point adjustments in conventional airflow outlets. Simultaneously, based on real-time thickness measurement feedback, the fixed-axis stepper motor at the corresponding position receives an electrical signal, thereby driving the elastic silicone ring to undergo elastic deformation from zero, changing the air duct gap size at the corresponding position. This enables independent circumferential zone adjustment or synchronous full-circumferential airflow adjustment.

[0020] Secondly, the elastic silicone ring used is lightweight and soft. Compared with fluororubber, silicone has a wider temperature range and, under the same thickness, its tensile strength is better than that of fluororubber. The adjustment pushing resistance is small, resulting in a smaller fixed-axis stepper motor and a lighter and more compact overall structure. The fixed-axis stepper motors at each point are modularly installed. If damaged, only the corresponding module needs to be replaced, which is convenient for disassembly and assembly, has low maintenance costs, and is easy to operate. In addition, the elastic silicone ring has airflow buffering and shock absorption functions during adjustment, which can reduce equipment noise.

[0021] Thirdly, based on the titanium alloy skeleton and adjusting block, an air channel and air chamber structure are further provided. High-pressure gas is introduced into the air chamber as needed, which in turn pushes the spiral plate located inside the air chamber to move horizontally outward. At the same time, the movement pushes the elastic silicone ring, which causes the surface of the elastic silicone ring to deform and generate spiral patterns. The patterns are used to change the airflow direction inside the air channel, generating spiral airflow, which can more gently and evenly surround the bubble, avoiding local overcooling or overheating. While maintaining thermoplastic efficiency, it greatly improves cooling uniformity and stability. Attached Figure Description

[0022] Figure 1 This is the main view structure diagram proposed in this invention.

[0023] Figure 2 This is a top view of the structure proposed in this invention.

[0024] Figure 3 This is an exploded cross-sectional view of the structure proposed in this invention.

[0025] Figure 4 The present invention proposes Figure 1 Enlarged view of the structure at point A in the middle.

[0026] Figure 5 This is a cross-sectional view of the fixed-axis stepper motor structure proposed in this invention.

[0027] Figure 6 This is an exploded view of the fixed-axis stepper motor structure proposed in this invention.

[0028] Figure 7 This is an exploded view of the adjustment mechanism structure proposed in this invention.

[0029] Figure 8 This is a cross-sectional view of the adjustment mechanism structure proposed in this invention.

[0030] Figure 9 This is a side view of the titanium alloy skeleton structure proposed in this invention.

[0031] In the diagram: 1. Base; 101. Connecting ring; 2. Lower air ring; 3. Upper air ring; 4. Air duct; 5. Adjustment mechanism; 501. Motor bracket; 502. Fixed-axis stepper motor; 503. Adjustment block; 5031. Hinge interface; 504. Titanium alloy frame; 505. Elastic silicone ring; 5051. Rounded corner edge; 6. Direction control mechanism; 601. Air duct; 602. Air chamber; 6021. Telescopic groove; 603. Spiral plate; 6031. Arc edge; 604. Flexible hose; 7. Air cover. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] The blown film airflow type air ring disclosed in this invention, which adjusts the airflow through a flexible variable medium, is mainly used in the production of thermoplastic films.

[0034] Reference Figures 1 to 9 A blown film airflow type air ring with adjustable flexible variable medium includes a base 1, a lower air ring 2 and an upper air ring 3 installed on the top of the base 1, an air duct 4 reserved between the lower air ring 2 and the upper air ring 3, and an adjustment mechanism 5 for controlling the airflow is provided inside the air duct 4. The adjustment mechanism 5 includes several motor brackets 501 arranged in a ring and installed on the top of the upper air ring 3. A fixed-axis stepper motor 502 is fixedly installed on the top of each motor bracket 501. The end of the fixed-axis stepper motor 502 extends horizontally into the interior of the upper air ring 3 and is fixedly installed with an adjustment block 503 by a pin. The outer sides of several adjustment blocks 503 are fixedly connected to a titanium alloy frame 504.

[0035] The regulating mechanism 5 is equipped with a control mechanism 6 for regulating the airflow pattern. The control mechanism 6 includes an air passage 601 opened inside each regulating block 503, an air chamber 602 opened inside each titanium alloy frame 504, and several spiral plates 603 slidably installed on the outside of each air chamber 602.

[0036] The thermoplastic film is shaped by blowing a stable airflow into the interior of the base 1 through the air duct 4, and the flow rate and direction of the airflow are adapted and controlled by the operation of the adjustment mechanism 5 and the direction control mechanism 6.

[0037] In this embodiment: the worker sequentially assembles and fixes the base 1, lower air ring 2, and upper air ring 3, and connects the air duct 4 to the external fan. At the same time, the plastic melt is extruded from the middle of the base 1 to form a vertically upward tubular membrane bubble. At this time, the external fan connected to the air duct 4 starts to run. The airflow generated by the fan enters the interior of the lower air ring 2 and upper air ring 3 through the air duct 4 and is sprayed onto the surface of the membrane bubble at a certain angle. The high-speed cold air will undergo forced convection heat exchange with the surface of the high-temperature membrane bubble, thereby rapidly carrying away a large amount of heat, causing the membrane bubble to cool and solidify. During this process, the adjustment mechanism 5 operates synchronously, extending into the interior of the air duct 4 to change the range of the airflow path of the air duct 4, thereby adjusting the flow speed of the airflow inside the air duct 4. The directional control mechanism 6 can operate synchronously along the interior of the adjustment mechanism 5 according to the worker's needs, thereby converting the direct current air generated by the air duct 4 into vortex air, improving cooling efficiency and stability.

[0038] A connecting ring 101 is installed between the base 1 and the downwind ring 2 to fix the base 1 and the downwind ring 2.

[0039] Furthermore, a wind shield 7 is fixedly installed on the top of the upper wind ring 3 to improve stability during the membrane bubble molding process.

[0040] Reference Figures 1 to 9 In a preferred embodiment, a plurality of titanium alloy frames 504 are arranged in a ring along the interior of the air duct 4, and an elastic silicone ring 505 is fitted onto the outer side of the plurality of titanium alloy frames 504.

[0041] During the process of introducing airflow into the lower air ring 2 and upper air ring 3 of the air duct 4, the adjustment mechanism 5 operates synchronously. At this time, the output end of the fixed-axis stepper motor 502 extends horizontally into the air duct 4. While extending, it pushes the titanium alloy frame 504 and the elastic silicone ring 505 to move synchronously into the air duct 4, thereby changing the range of the airflow path of the air duct 4 and adjusting the flow speed of the airflow inside the air duct 4. In addition, according to the feedback of the real-time thickness measurement curve, the fixed-axis stepper motor 502 at the corresponding position receives an electrical signal and pushes the elastic silicone ring 505 at the corresponding position to undergo elastic deformation from zero position, thereby changing the gap size of the air duct 4 at the corresponding position, realizing the function of independent adjustment of the circumferential zone or synchronous adjustment of the air volume throughout the circumference.

[0042] The adjusting block 503 has a through hinge interface 5031. The output end of the fixed axis stepper motor 502 and the adjusting block 503 are fixedly connected through the hinge interface 5031 and the pin. The pin is pulled out to adjust the position of the output end of the fixed axis stepper motor 502 inside the adjusting block 503, and the pin is put back into the hinge interface 5031, thereby changing the distance between the adjusting block 503 and the fixed axis stepper motor 502.

[0043] Furthermore, several telescopic grooves 6021 are provided through the outer side of the air chamber 602. Each spiral plate 603 is slidably installed inside a telescopic groove 6021, and a hose 604 is installed through the top of each air passage 601. The end of the hose 604 passes through the inside of the upper air ring 3 and is connected to an external pump.

[0044] Specifically, the outer surface of the elastic silicone ring 505 is provided with rounded corner edges 5051 at both the upper and lower ends. The rounded corner edges 5051 are distributed inside the air duct 4, and the bottom of each spiral plate 603 is provided with an arc edge 6031. The design of the rounded corner edges 5051 and the arc edge 6031 is used to reduce the interference encountered by the airflow when it flows along the inside of the air duct 4, thereby improving the stability of the airflow inside the air duct 4.

[0045] Reference Figure 1 , Figures 4 to 9 In a preferred embodiment, the air passage 601 and the air chamber 602 are connected in a continuous manner, and the spiral plate 603 is pressed against the inner side of the elastic silicone ring 505.

[0046] When the worker needs to change the airflow direction inside the air duct 4, the worker controls the external pump connected to the air duct 601. The pump introduces high-pressure gas into the air duct 601 and the air chamber 602, which in turn pushes the spiral plate 603 located inside the air chamber 602 to move horizontally outward. The moving spiral plate 603 pushes the elastic silicone ring 505, which in turn causes the surface of the elastic silicone ring 505 to deform and generate spiral patterns. At this time, the direct flow of gas along the surface of the elastic silicone ring 505 will be guided by the spiral patterns and become a spiral vortex, which cools and shapes the surface of the membrane bubble.

[0047] The intensity of the spiral vortex is affected by factors such as wind speed, thickness of elastic silicone ring 505, and shape and size of spiral plate 603. These factors can be designed and adjusted according to production needs, and will not be elaborated here.

[0048] Working Principle: During use, the worker assembles and fixes the base 1, lower air ring 2, and upper air ring 3 in sequence, and connects the air duct 4 to the external fan. Simultaneously, molten plastic is extruded from the center of the base 1, forming a vertically upward-facing tubular membrane bubble. At this time, the external fan connected to the air duct 4 starts operating. The airflow generated by the fan enters the interior of the lower air ring 2 and upper air ring 3 through the air duct 4 and is sprayed onto the surface of the membrane bubble at a certain angle. The high-speed cold air undergoes forced convection heat exchange with the high-temperature membrane bubble surface, rapidly carrying away a large amount of heat, causing the membrane bubble to cool and solidify. During this process, the adjustment mechanism 5 operates synchronously. At this time, the output end of the fixed-axis stepper motor 502 extends horizontally into the air duct 4. Simultaneously, it pushes the titanium alloy frame 504 and the elastic silicone ring 505 to move synchronously into the air duct 4, thereby changing the flow path of the air duct 4 and adjusting the flow speed of the airflow inside the air duct 4. Furthermore, this equipment can adjust the flow speed based on real-time thickness curves. Feedback is received when the fixed-axis stepper motor 502 at the corresponding position receives an electrical signal, which drives the elastic silicone ring 505 at the corresponding position to undergo elastic deformation from zero position. This changes the gap size of the air duct 4 at the corresponding position, realizing the function of independent adjustment of air volume in the circumferential direction or synchronous adjustment of the whole circumference. When the worker needs to change the airflow direction inside the air duct 4, the worker controls the external pump connected to the air duct 601. The pump introduces high-pressure gas into the air duct 601 and the air chamber 602, which in turn pushes the spiral plate 603 located inside the air chamber 602 to move horizontally outward. The moving spiral plate 603 pushes the elastic silicone ring 505, which in turn causes the surface of the elastic silicone ring 505 to deform and generate spiral patterns. At this time, the direct gas flowing along the surface of the elastic silicone ring 505 will be guided by the spiral patterns and become a spiral vortex, which cools and shapes the surface of the membrane bubble more quickly. This is suitable for membrane production with higher cooling requirements.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A blow film air volume type air ring adjusted by flexible variable medium, comprising a base (1), a lower air ring (2) and an upper air ring (3) mounted on the top of the base (1), characterized in that, The lower wind ring (2) and the upper wind ring (3) are reserved with an air duct (4), the inside of the air duct (4) is provided with an adjusting mechanism (5) for controlling the air volume, the adjusting mechanism (5) comprises a plurality of motor supports (501) arranged in a ring and installed on the top of the upper wind ring (3), a fixed shaft type stepping motor (502) is fixedly installed on the top of each motor support (501), the end of the fixed shaft type stepping motor (502) penetrates horizontally into the inside of the upper wind ring (3) and is fixedly installed with an adjusting block (503) through a latch, the outside of a plurality of adjusting blocks (503) is commonly fixedly connected to a titanium alloy framework (504); The inside of the adjusting mechanism (5) is provided with a direction control mechanism (6) for adjusting the airflow form, the direction control mechanism (6) comprises an air channel (601) opened in the inside of each adjusting block (503), an air cavity (602) is opened in the inside of each titanium alloy framework (504), a plurality of spiral plates (603) are slidingly installed on the outside of each air cavity (602); The inside of the air duct (4) is provided with an air duct (4), and the inside of the air duct (4) is provided with an air duct (4). The titanium alloy framework (504) is arranged in a ring along the inside of the air duct (4), and an elastic silica gel ring (505) is commonly sleeved and installed on the outside of the titanium alloy framework (504); The air channel (601) and the air cavity (602) are connected through, and the spiral plate (603) is in extrusion contact with the inside of the elastic silica gel ring (505).

2. A blow film air volume ring with flexible variable media regulation as defined in claim 1, wherein, The base (1) and the lower wind ring (2) are connected and installed with a connecting ring (101).

3. A blow film air volume ring with flexible variable media regulation as defined in claim 1, wherein, A hinge opening (5031) is penetrated and opened in the inside of the adjusting block (503), and the output end of the fixed shaft type stepping motor (502) and the adjusting block (503) are fixedly connected through the hinge opening (5031) and the latch.

4. A blow film air volume ring with flexible variable media regulation as defined in claim 2, wherein, The outer surface of the elastic silica gel ring (505) is provided with a round corner (5051) at the upper end and the lower end, and the round corner (5051) is distributed in the inside of the air duct (4).

5. A blow film air volume ring with flexible variable media regulation as defined in claim 1, wherein, The outside of the air cavity (602) is penetrated and opened with a plurality of expansion slots (6021), and each spiral plate (603) is slidingly installed in the inside of the expansion slot (6021).

6. A blow film air volume ring with flexible variable media regulation as defined in claim 1, wherein, The bottom of each spiral plate (603) is provided with an arc edge (6031).

7. A blow film air volume ring with flexible variable media regulation as defined in claim 1, wherein, The top end of each air channel (601) is penetrated and installed with a hose (604), and the end of the hose (604) penetrates out from the inside of the upper wind ring (3) and is connected with an external pump.

8. A blow film air volume ring with flexible variable media regulation as defined in claim 1, wherein, The top of the upper wind ring (3) is fixedly installed with a wind cover (7).

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