Plastic blown film machine air ring adjustment structure
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-21
- Publication Date
- 2026-08-11
AI Technical Summary
但近年来，随着吹膜技术不断发展，生产出来的膜泡直径越来越大（最近已经出现有直径大约八米的膜泡）；显然，膜泡直径越大，则调风圈、护风圈的直径相应越大、越沉重（调风圈、护风圈为金属材料），因而依靠人工调节其竖向位置越麻烦、越困难
一、本实用新型使用过程中，当电动推杆启动使电动推杆的伸缩杆动作，则伸缩杆推动滚轮沿斜块滚动，使滚轮和活动支座的竖向位置改变，因此就能改变第二圆环形构件的竖向位置。当第一圆环形构件为风室上盖、第二圆环形构件为调风圈，则能够调节调风圈（包括内风道块）的竖向位置，从而改变下风道块与内风道块之间的第二环形分支风道的竖向尺寸，最终实现调节改变环形上出风口、环形下出风口两者吹出气流的比例。当第一圆环形构件为调风圈、第二圆环形构件为护风圈，则能够调节护风圈和调风圈（上风道块）之间的竖向相对位置，最终实现调节改变护风圈凸出尺寸。
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Figure CN224616788U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of blown film machines, and specifically relates to an air ring adjustment structure for a plastic blown film machine. Background Technology
[0002] During the blown film process, molten material is extruded from the annular die gap of the plastic blown film machine to form a continuously rising annular film bubble. The film bubble reaches a high temperature during extrusion, therefore a cooling ring is needed to ensure its final shape. The cooling ring is installed above the annular die gap and its structure includes an upper air chamber cover, a lower air chamber cover, an air regulating ring, an upper air duct block, a lower air duct block, an inner air duct block, and a protective air ring. All of these components are annular. The air regulating ring, upper air duct block, and inner air duct block are fixedly connected together. The space between the upper and lower air chamber covers forms an annular main air chamber, and the interlayer between the air regulating ring and the lower air duct block forms an annular main air duct. There are vertical gaps between the outer surface of the inner air duct block and the air regulating ring, and also between the outer surface of the inner air duct block and the upper air duct. A first annular branch air duct is formed, and a second annular branch air duct is formed in the horizontal interlayer between the lower air duct block and the inner air duct block. The annular main air chamber is connected to the annular main air duct, which in turn connects to the first and second annular branch air ducts. The first annular branch air duct has an annular upper air outlet, which faces outward and upward, primarily upward and secondarily outward. The second annular branch air duct has an annular lower air outlet, which faces inward and upward, primarily inward and secondarily upward. The weight of the protective air ring is supported by the air regulating ring, which protrudes upward relative to the annular upper air outlet. "Inward" refers to facing the vertical central axis of the plastic film blowing machine, and "outward" refers to moving away from the vertical central axis of the plastic film blowing machine.
[0003] During operation, the cooling airflow enters the main air chamber through the main air inlet, then enters the annular main air duct, and then splits into two streams. The first stream flows into the first annular branch air duct and flows to the membrane bulb through the annular upper air outlet, while the second stream flows into the second annular branch air duct and flows to the membrane bulb through the annular lower air outlet, thereby cooling the membrane bulb. Because the protective air ring protrudes upward relative to the annular upper air outlet, it can prolong the time that the membrane bulb receives air cooling, improve the cooling effect, and stabilize the airflow, thus stabilizing the membrane bulb.
[0004] On the other hand, because the degree of condensation and inflation of the membrane bubble varies when it passes through different vertical positions, and the annular upper and lower air outlets are located in different vertical positions and directions, the effects of the airflow from the annular upper and lower air outlets are different. The magnitude of the airflow from the two outlets needs to be in a reasonable ratio. Moreover, depending on parameters such as the membrane bubble material, extrusion speed, extrusion thickness, and cooling airflow velocity, the airflow distribution ratio between the two outlets needs to be adjusted accordingly. The method for adjusting the distribution ratio between the annular upper and lower air outlets is to change the vertical position of the air adjustment ring, thereby changing the vertical dimensions of the second annular branch air duct.
[0005] Similarly, for membrane bubbles with different diameters, materials, extrusion speeds, wall thicknesses, and cooling airflow speeds, the ideal vertical dimension of the air guard ring protruding upwards relative to the annular upper air outlet (referred to as the air guard ring protrusion dimension, which is equivalent to the vertical height difference between the air guard ring and the annular upper air outlet) is also different, so the air guard ring protrusion dimension also needs to be adjusted.
[0006] In existing technologies, adjusting the vertical position of the air regulating ring and the protruding size of the air shield ring are usually done manually. However, in recent years, with the continuous development of blown film technology, the diameter of the produced film bubbles has become larger and larger (film bubbles with a diameter of about eight meters have recently appeared). Obviously, the larger the diameter of the film bubble, the larger and heavier the diameter and air shield ring (the air regulating ring and air shield ring are made of metal), making it more troublesome and difficult to adjust their vertical position manually. Utility Model Content
[0007] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a plastic blown film machine air ring adjustment structure, which can conveniently adjust the vertical position of the air ring / the protrusion size of the air guard ring.
[0008] The objective can be achieved as follows: A plastic blown film machine air ring adjustment structure includes an air ring body, which has an inner and outer interlocking first annular component and a second annular component, which can rotate relative to each other and slide relative to each other vertically; characterized in that multiple electric vertical drive mechanisms are provided between the first annular component and the second annular component, and each electric vertical drive mechanism is evenly arranged along the circumference of the first annular component and the second annular component; each electric vertical drive mechanism includes an electric push rod, a fixed support, and a movable support. The base, intermediate transmission block, and inclined block are fixedly connected to the first annular component. The movable support is fixedly connected to the second annular component. The movable support is fixedly connected to a movable support joint. A roller is installed at the bottom of the movable support and is placed on the inclined block. The main body of the electric push rod is connected to the fixed support via a first horizontal hinge shaft. The telescopic rod of the electric push rod is connected to the intermediate transmission block via a second horizontal hinge shaft. The first horizontal hinge shaft is parallel to the second horizontal hinge shaft. The intermediate transmission block is connected to the movable support joint via a vertical hinge shaft.
[0009] The air ring body includes an annular upper cover of the air chamber, an annular lower cover of the air chamber, an annular regulating ring, an annular upper air duct block, an annular lower air duct block, an annular inner air duct block, and an annular protective ring. The regulating ring, upper air duct block, and inner air duct block are fixedly connected together. The space between the upper and lower covers of the air chamber forms an annular main air cavity, and the interlayer between the regulating ring and the lower air duct block forms an annular main air duct. The vertical gap between the outer surface of the inner air duct block and the regulating ring, as well as the inner air duct... The outer surface of the block and the vertical gap between the upper air duct block form the first annular branch air duct, and the interlayer between the inner air duct block and the lower air duct block forms the second annular branch air duct; the annular main air cavity is connected to the annular main air duct, and the annular main air duct is connected to the first annular branch air duct and the second annular branch air duct respectively. The first annular branch air duct is provided with an annular upper air outlet, and the second annular branch air duct is provided with an annular lower air outlet; the weight of the windproof ring is supported by the air regulating ring, and the windproof ring protrudes upward relative to the annular upper air outlet.
[0010] The first annular component is the top cover of the air chamber, and the second annular component is the air regulating ring.
[0011] The first annular component is the air regulating ring, and the second annular component is the air protection ring.
[0012] Four electric vertical drive mechanisms are provided between the first and second annular components.
[0013] This utility model has the following advantages and effects: I. In the use of this utility model, when the electric push rod is activated, its telescopic rod moves, pushing the roller to roll along the inclined block, thus changing the vertical position of the roller and the movable support, thereby changing the vertical position of the second annular component. When the first annular component is the upper cover of the air chamber and the second annular component is the air regulating ring, the vertical position of the air regulating ring (including the inner air duct block) can be adjusted, thereby changing the vertical dimension of the second annular branch air duct between the lower air duct block and the inner air duct block, ultimately achieving the adjustment and change of the airflow ratio between the annular upper air outlet and the annular lower air outlet. When the first annular component is the air regulating ring and the second annular component is the air guard ring, the vertical relative position between the air guard ring and the air regulating ring (upper air duct block) can be adjusted, ultimately achieving the adjustment and change of the protruding dimension of the air guard ring.
[0014] Second, the electric push rod is controlled by inching, which can achieve stepless adjustment and self-locking to ensure the reliability of adjustment. At the same time, it can ensure that the electric push rods of each electric vertical drive mechanism in the circumferential direction move synchronously, so that the second ring component maintains a stable horizontal posture during the adjustment process. Attached Figure Description
[0015] Figure 1 This is a schematic cross-sectional view of the cooling air ring involved in Embodiment 1 and Embodiment 2.
[0016] Figure 2 yes Figure 1 A magnified view of part of E in the diagram.
[0017] Figure 3 yes Figure 1 The diagram shows a three-dimensional structure of the cooling air ring.
[0018] Figure 4 yes Figure 3 The diagram shows a top view of the cooling air ring structure.
[0019] Figure 5 yes Figure 4 A magnified view of part of C.
[0020] Figure 6 yes Figure 3 A magnified view of part A in the diagram.
[0021] Figure 7 This is a three-dimensional structural schematic diagram of the first electric vertical drive mechanism in Embodiment 1.
[0022] Figure 8 yes Figure 7 The diagram shows the changing states of the first electric vertical drive mechanism.
[0023] Figure 9 This is a three-dimensional structural diagram of the movable support and rollers of the first electric vertical drive mechanism.
[0024] Figure 10 yes Figure 4 A magnified view of part of D.
[0025] Figure 11 yes Figure 3 A magnified view of part B in the diagram.
[0026] Figure 12 This is a three-dimensional structural schematic diagram of the second electric vertical drive mechanism in Embodiment 2.
[0027] Figure 13 This is a three-dimensional structural diagram of the movable support and rollers of the second electric vertical drive mechanism. Detailed Implementation Example 1
[0028] Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the air ring body of the plastic blown film machine involved in Embodiment 1 includes an annular upper air chamber cover 21, an annular lower air chamber cover 22, an annular air regulating ring 23, an annular upper air duct block 24, an annular lower air duct block 25, an annular inner air duct block 26, and an annular protective air ring 27. The air regulating ring 23, the upper air duct block 24, and the inner air duct block 26 are fixedly connected together. The space between the upper air chamber cover 21 and the lower air chamber cover 22 forms an annular main air chamber 31. The interlayer between the air regulating ring 23 and the lower air duct block 25 forms an annular main air duct 32. The vertical gap between the outer surface of the inner air duct block 26 and the air regulating ring 23, and the vertical gap between the outer surface of the inner air duct block 26 and the upper air duct block 24, combine to form a first annular branch air duct 34. The interlayer between the inner air duct block 26 and the lower air duct block 25... The part is formed as a second annular branch air duct 33, wherein the inner air duct block 26 and the air regulating ring 23 are fixedly connected together by multiple connecting pins 28. Each connecting pin 28 is evenly distributed along the circumference of the inner air duct block 26, and each connecting pin 28 passes through the vertical gap between the outer surface of the inner air duct block 26 and the air regulating ring 23 (i.e., passes through the first annular branch air duct 34). The annular main air chamber 31 is connected to the annular main air duct 32, and the annular main air duct 32 is connected to the first annular branch air duct 34 and the second annular branch air duct 33 respectively. The first annular branch air duct 34 is provided with an annular upper air outlet 35, and the second annular branch air duct 33 is provided with an annular lower air outlet 36. The weight of the wind guard ring 27 is supported by the air regulating ring 23. The wind guard ring 27 protrudes upward relative to the annular upper air outlet 35, that is, the vertical position of the upper edge of the wind guard ring 27 is higher than the annular upper air outlet 35.
[0029] Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the air ring adjustment structure of the plastic blown film machine in Embodiment 1 refers to the fact that the air chamber cover 21 and the air adjustment ring 23 of the air ring body can both rotate relative to each other and slide relative to each other in the vertical direction. Four first electric vertical drive mechanisms 1 are provided between the air chamber cover 21 and the air adjustment ring 23. Each first electric vertical drive mechanism 1 is evenly arranged along the circumference of the air chamber cover 21 and the air adjustment ring 23, that is, the orientation of each two adjacent first electric vertical drive mechanisms 1 differs by 90°. Figure 5 , Figure 6 , Figure 7 , Figure 9 As shown, each first electric vertical drive mechanism 1 includes an electric push rod 12, a fixed support 11, a movable support 14, an intermediate transmission block 13, and an inclined block 16. The fixed support 11 and the inclined block 16 are fixedly connected to the upper cover 21 of the air chamber. The movable support 14 is fixedly connected to the air regulating ring 23. Specifically, the movable support 14 is fixedly connected to the upper part of the air regulating ring 23 by a vertical bolt 51. The movable support 14 is fixedly connected to a movable support joint 15. A roller 17 is installed at the bottom of the movable support 14 and is placed on the inclined block 16. The main body 120 of the electric push rod and the fixed support 11 are connected together by a first horizontal hinge shaft 41. The telescopic rod 121 of the electric push rod and the intermediate transmission block 13 are connected together by a second horizontal hinge shaft 42. The first horizontal hinge shaft 41 is parallel to the second horizontal hinge shaft 42. The intermediate transmission block 13 is connected to the movable support joint 15 by a vertical hinge shaft 43.
[0030] The operating principle of Embodiment 1 is as follows: When it is necessary to adjust and change the ratio of the airflow from the first annular branch duct 34 and the second annular branch duct 33, the electric push rod 12 is activated to move the extension rod 121 of the electric push rod, pushing the roller 17 to roll along the inclined block 16, thereby changing the vertical position of the roller 17 and the movable support 14, for example from... Figure 7 The state shown evolves into Figure 8 As shown, the vertical position of the air regulating ring 23 can be changed. Since the air regulating ring 23, the upper air duct block 24, and the inner air duct block 26 are fixedly connected together and move vertically synchronously during the adjustment process, the change in the vertical position of the air regulating ring 23 will change the vertical dimension of the second annular branch air duct 33 between the lower air duct block 25 and the inner air duct block 26, and finally realize the adjustment and change of the ratio of the airflow blown out by the annular upper air outlet 35 and the annular lower air outlet 36.
[0031] During the above adjustment process, the upper cover 21 of the air chamber remains fixed, while the air adjusting ring 23 rotates a small angle around the vertical central axis of the air ring body (maintaining a horizontal posture during the rotation). The posture of the electric push rod 12 changes continuously (the tilt angle changes continuously), while the posture of the fixed support 11 remains unchanged (because the upper cover 21 of the air chamber remains fixed), and the posture of the movable support 14 remains unchanged (because the air adjusting ring 23 maintains a horizontal posture). Therefore, the main body 120 of the electric push rod rotates a certain angle relative to the fixed support 11 around the first horizontal hinge axis 41, and the telescopic rod 121 of the electric push rod rotates relative to the intermediate transmission block 13 around the second horizontal hinge axis. The connecting shaft 42 rotates at a certain angle; in addition, the horizontal projection shape of the moving trajectory of the movable support 14 is theoretically an arc (the center point of the arc is located on the vertical central axis of the wind ring), while the moving trajectory of the end of the electric push rod telescopic rod 121 is located in a vertical plane. Therefore, the movable support 14 and the intermediate transmission block 13 rotate at a certain angle around the vertical hinge shaft 43; during the process of the roller 17 rolling up and down along the upper surface of the inclined block 16, the roller 17 will undergo a slight radial sliding relative to the upper surface of the inclined block 16. Here, radial sliding refers to radial sliding along the wind ring (equivalent to radial sliding along the membrane bubble).
[0032] In the above embodiment 1, the first electric vertical drive mechanism 1 between the wind chamber cover 21 and the air regulating ring 23 can be changed to three or five. Example 2
[0033] The structure of the air ring body of the plastic blown film machine involved in Example 2 is the same as that in Example 1 (except for the air ring adjustment structure of the plastic blown film machine in Example 1).
[0034] Figure 3 , Figure 4 , Figure 10 , Figure 11 As shown, the air ring adjustment structure of the plastic blown film machine in Embodiment 2 refers to the fact that the air adjusting ring 23 and the air guard ring 27 of the air ring body of the plastic blown film machine can both rotate relative to each other and slide relative to each other vertically. Four second electric vertical drive mechanisms 2 are provided between the air adjusting ring 23 and the air guard ring 27. Each second electric vertical drive mechanism 2 is evenly arranged along the circumference of the air adjusting ring 23 and the air guard ring 27, that is, the orientation of each two adjacent second electric vertical drive mechanisms 2 differs by 90°. From the circumference of the air ring body, the circumferential position of each second electric vertical drive mechanism 2 in Embodiment 2 is located between two of the first electric vertical drive mechanisms 1 in Embodiment 1.
[0035] The second electric vertical drive mechanism 2 in Embodiment 2 is basically the same as the first electric vertical drive mechanism 1 in Embodiment 1, except that: 1. In Embodiment 2, the fixed support 11, the inclined block 16, and the air regulating ring 23 of the second electric vertical drive mechanism 2 are fixedly connected together, while the movable support 14 and the air guard ring 27 of the second electric vertical drive mechanism 2 are fixedly connected together, such as... Figure 3 , Figure 4 , Figure 10 , Figure 11 As shown; 2. Since the movable support 14 of Embodiment 2 is connected to the wind shield 27, while the movable support 14 of Embodiment 1 is connected to the air regulating ring 23, the shape of the movable support 14 of the second electric vertical drive mechanism 2 in Embodiment 2 is different from that of the movable support 14 of the first electric vertical drive mechanism 1 in Embodiment 1. The wind shield 27 of Embodiment 2 is connected to the inner side of the movable support 14 by a horizontal bolt 52, as shown. Figure 10 , Figure 11 , 12 , Figure 13 As shown.
[0036] In Embodiment Two, the vertical relative position between the air shield ring 27 and the air regulating ring 23 can be adjusted. Furthermore, since the upper air duct block 24 and the air regulating ring 23 are fixedly connected, the relative positional relationship between the upper air duct block 24 and the annular upper air outlet 35 is fixed. Therefore, the vertical dimension of the air shield ring 27 protruding upwards relative to the annular upper air outlet 35 can be adjusted, i.e., the protrusion dimension of the air shield ring can be changed. The principle of the adjustment process in Embodiment Two is similar to that in Embodiment One.
[0037] In the above embodiment 2, the second electric vertical drive mechanism 2 between the air regulating ring 23 and the air guard ring 27 can be changed to three or five.
Claims
1. A wind ring adjustment structure for a plastic blown film machine, comprising a wind ring body, the wind ring body having an inner and outer interlocking first annular component and a second annular component, the first annular component and the second annular component being able to rotate relative to each other and slide relative to each other vertically; characterized in that: Multiple electric vertical drive mechanisms are provided between the first and second annular components, and each electric vertical drive mechanism is evenly arranged along the circumference of the first and second annular components. Each electric vertical drive mechanism includes an electric push rod, a fixed support, a movable support, an intermediate transmission block, and an inclined block. The fixed support and the inclined block are fixedly connected to the first annular component, and the movable support is fixedly connected to the second annular component. The movable support is fixedly connected to a movable support joint, and a roller is installed at the bottom of the movable support, with the roller resting on the inclined block. The main body of the electric push rod is connected to the fixed support via a first horizontal hinge shaft, and the telescopic rod of the electric push rod is connected to the intermediate transmission block via a second horizontal hinge shaft. The first horizontal hinge shaft is parallel to the second horizontal hinge shaft, and the intermediate transmission block is connected to the movable support joint via a vertical hinge shaft.
2. The air ring adjustment structure for a plastic blown film machine according to claim 1, characterized in that: The air ring body includes an annular upper cover, an annular lower cover, an annular regulating ring, an annular upper air duct block, an annular lower air duct block, an annular inner air duct block, and an annular protective ring. The regulating ring, upper air duct block, and inner air duct block are fixedly connected together. The space between the upper and lower covers forms an annular main air chamber, and the interlayer between the regulating ring and the lower air duct block forms an annular main air duct. The vertical gap between the outer surface of the inner air duct block and the regulating ring, as well as the inner air duct... The outer surface of the duct block and the vertical gap between the upper duct block form the first annular branch duct, and the interlayer between the inner duct block and the lower duct block forms the second annular branch duct. The annular main air chamber is connected to the annular main duct, and the annular main duct is connected to the first annular branch duct and the second annular branch duct. The first annular branch duct is provided with an annular upper air outlet, and the second annular branch duct is provided with an annular lower air outlet. The weight of the windproof ring is supported by the air regulating ring, and the windproof ring protrudes upward relative to the annular upper air outlet.
3. The air ring adjustment structure for a plastic blown film machine according to claim 2, characterized in that: The first annular component is the top cover of the air chamber, and the second annular component is the air regulating ring.
4. The air ring adjustment structure for a plastic blown film machine according to claim 2, characterized in that: The first annular component is the air regulating ring, and the second annular component is the air protection ring.
5. The air ring adjustment structure for a plastic blown film machine according to any one of claims 1 to 4, characterized in that: Four electric vertical drive mechanisms are provided between the first and second annular components.