A plastic film blowing machine bubble stabilizing device
Patent Information
- Application Number
- CN202522523423.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-11-27
AI Technical Summary
[0003]目前，吹膜机稳泡装置大多采用多个沿膜泡一周分布，并相切于膜泡的圆辊对膜泡进行限制，在生产过程中，薄膜始终处于被牵拉移动的状态，圆辊设置为可转动的，用以降低圆辊和薄膜之间的摩擦力，但是，虽然圆辊可转动，但自身无动力，这就使得薄膜与圆辊接触时，圆辊需要被薄膜牵引才可转动，导致薄膜的移动负载增加，使薄膜受到一个与运动方向相反的力，而膜泡处于熔融塑料刚被吹出的状态，其自身温度较高，表面未完全凝固，在表面受到与运动方向相反的作用力时，表面会因牵拉而出现波纹，甚至是局部厚度变薄，导致薄膜出现厚度不均匀的现象
1、通过在与膜泡相切的限位管上设置多个调节气嘴，调节气嘴向膜泡方向吹送气流，并根据膜泡的直径调节各个调节气嘴的吹送气流大小，使各个调节气嘴吹出的气体作用在膜泡上的压力一致，通过气体压力对膜泡施加向内的作用力，限制膜泡的直径，膜泡不与限位管接触，避免产生相互摩擦，保证了薄膜的生产质量；且通过多个调节气嘴吹出的气流能够增大对膜泡外壁施加作用力的面积，提高膜泡直径的均匀程度，降低膜泡因受力点过少而导致的直径波动范围。
Smart Images
Figure CN224714451U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of blown film equipment, specifically referring to a foam stabilizing device for a plastic blown film machine. Background Technology
[0002] A blown film machine is a mechanical device that heats and melts plastic particles and then blows them into thin films. First, the plastic particles are gradually melted into a molten state. The molten plastic is extruded into a tube shape through a die, and compressed air is introduced at the same time to inflate the tubular plastic into a film bubble. After the film bubble is cooled by a cooling device, it gradually solidifies into a thin film. During the blowing of the plastic into a film bubble, a bubble stabilizing device is needed to limit the diameter and position of the film bubble to prevent the film bubble from being skewed or having an excessively large diameter.
[0003] Currently, most blown film machines use multiple circular rollers distributed around the perimeter of the film bubble and tangential to it to restrict the bubble. During production, the film is always in a state of being pulled and moved. The circular rollers are designed to be rotatable to reduce the friction between the rollers and the film. However, although the rollers are rotatable, they have no power of their own. This means that when the film comes into contact with the rollers, the rollers need to be pulled by the film to rotate, which increases the moving load on the film. This causes the film to be subjected to a force opposite to the direction of movement. Since the film bubble is in the state of molten plastic just blown out, its temperature is high and the surface is not completely solidified. When the surface is subjected to a force opposite to the direction of movement, the surface will show ripples due to the pulling, or even local thinning, resulting in uneven film thickness. Utility Model Content
[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a foam stabilizing device for a plastic blown film machine, which at least partially solves the above problems.
[0005] The technical solution adopted by this utility model is as follows: This utility model proposes a foam stabilizing device for a plastic blown film machine, including a cylindrical support and multiple mounting shafts. The mounting shafts are rotatably connected to the cylindrical support parallel to the length direction of the cylindrical support, and the multiple mounting shafts are evenly distributed along the circumference of the cylindrical support. The mounting shaft is provided with a plurality of limiting arms, which are connected to the mounting shaft perpendicular to the length direction of the mounting shaft, and the plurality of limiting arms are distributed along the length direction of the mounting shaft; The limiting arm includes a bracket and a limiting tube, the bracket being connected to the mounting shaft, and the limiting tube being rotatably connected to the bracket; The sidewall of the limiting tube is provided with an open mounting groove along its length, and the opening of the mounting groove faces outward from the limiting tube radially. The mounting groove is provided with a plurality of adjusting nozzles for blowing air and adjusting the airflow size, and the plurality of adjusting nozzles are evenly distributed along the length of the limiting tube.
[0006] Furthermore, the bracket is configured as a U-shaped structure with lugs at both ends, and the two ends of the limiting tube are respectively rotatably connected to the lugs at both ends of the bracket. The bottom of the bracket is configured as an arc-shaped structure that matches the shape of the limiting tube. A drainage gap with an arc-shaped cross section is provided between the bracket and the limiting tube. When multiple regulating nozzles blow air simultaneously, and the limiting tube rotates so that the opening of the mounting groove faces the drainage gap, the drainage gap can guide the airflow upward along the outer wall of the limiting tube and form a low-pressure zone on the outside of the limiting tube.
[0007] Furthermore, a second motor is fixed to one end of the bracket, and the output end of the second motor is connected to the limiting tube to drive the limiting tube to rotate.
[0008] Furthermore, multiple circumferentially evenly distributed ranging sensors are fixed at both the top and bottom of the cylindrical support.
[0009] Furthermore, the limiting arm also includes a gas supply hose, one end of which is connected to the limiting tube, and the other end of which is connected to a gas supply device. The gas supply device supplies gas to the limiting tube through the gas supply hose. The gas supply device is connected to the gas supply hose through a gas supply rigid pipe, and a control valve is provided on the gas supply rigid pipe.
[0010] Furthermore, it also includes an ion wind module for removing static electricity, the output end of which is connected to the gas delivery pipe.
[0011] Furthermore, the regulating nozzle includes an air pipe and an adjusting plate. The air pipe is a round pipe with an opening at one end. The open end of the air pipe is connected to the mounting groove and communicates with the inside of the limiting tube. The adjusting plate is rotatably connected to the end face of the other end of the air pipe. The end face of the air pipe has a plurality of circumferentially distributed first exhaust grooves. The adjusting plate has a second exhaust groove corresponding to the first exhaust grooves.
[0012] Furthermore, the center of the adjustment plate is provided with a rotating shaft, and the adjustment plate is rotatably connected to the air pipe through the rotating shaft. The end of the rotating shaft away from the air pipe is provided with an adjustment groove.
[0013] Furthermore, the cylindrical bracket is provided with a driving component, which includes a first motor, a transmission wheel and a transmission belt. The transmission wheel is coaxially fixed to the same end of the plurality of mounting shafts. The plurality of transmission wheels are connected by the transmission belt, so that the plurality of mounting shafts can rotate synchronously. The first motor is fixed on the cylindrical bracket, and the output end of the first motor is connected to any one of the plurality of mounting shafts.
[0014] Furthermore, the transmission wheel includes gears, and the transmission belt includes a toothed belt that meshes with a plurality of the gears.
[0015] The beneficial effects of this utility model by adopting the above structure are as follows: 1. By setting multiple regulating nozzles on the limiting tube tangent to the membrane bubble, the regulating nozzles blow airflow towards the membrane bubble, and the blowing airflow of each regulating nozzle is adjusted according to the diameter of the membrane bubble, so that the pressure of the gas blown from each regulating nozzle on the membrane bubble is consistent. The gas pressure applies an inward force to the membrane bubble, limiting the diameter of the membrane bubble. The membrane bubble does not contact the limiting tube, avoiding mutual friction and ensuring the production quality of the film. Moreover, the airflow blown from multiple regulating nozzles can increase the area of force applied to the outer wall of the membrane bubble, improve the uniformity of the membrane bubble diameter, and reduce the diameter fluctuation range caused by too few force points.
[0016] 2. By setting an arc-shaped drainage gap between the support and the limiting tube, when the opening of the mounting groove faces the drainage gap, the air can flow upward along the outer wall of the limiting tube under the guidance of the drainage gap. Since the airflow speed on the outer wall of the limiting tube is relatively fast, a low-pressure area can be formed on the outside of the limiting tube, generating suction, thereby applying a force to the membrane to move to one side of the limiting tube, which can correct the verticality of the membrane bubble. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a foam stabilizing device for a plastic blown film machine according to an embodiment of the present invention; Figure 2 This is a top view of a foam stabilizing device for a plastic blown film machine according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the installation position of the limiting arm in a foam stabilizing device for a plastic blown film machine according to an embodiment of this utility model. Figure 4 This is a schematic diagram of the support structure in a foam stabilizing device for a plastic blown film machine according to an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the state of the air nozzle blowing air toward the film bubble in a bubble stabilizing device for a plastic blown film machine, as proposed in an embodiment of this utility model. Figure 6This is a schematic diagram illustrating the state of the air nozzle blowing air toward the guide gap in a foam stabilizing device for a plastic blown film machine, as proposed in an embodiment of this utility model. Figure 7 This is a schematic diagram illustrating the state of the air pressure of the air nozzle acting on the outer wall of the film bubble in a bubble stabilizing device for a plastic blown film machine, as proposed in an embodiment of this utility model. Figure 8 This is a schematic diagram of the connection between the ion air module and the air delivery rigid pipe in a foam stabilizing device for a plastic blown film machine according to an embodiment of the present invention. Figure 9 This is a schematic diagram showing the disassembled structure of the adjusting nozzle in a bubble stabilizing device for a plastic blown film machine, as proposed in an embodiment of this utility model.
[0018] The components include: 1. Cylindrical bracket; 2. Mounting shaft; 3. First motor; 31. Transmission wheel; 32. Transmission belt; 4. Limiting arm; 41. Bracket; 42. Limiting tube; 421. Mounting groove; 43. Second motor; 44. Gas supply hose; 401. Drainage gap; 45. Adjusting nozzle; 451. Gas pipe; 452. Adjusting plate; 453. First exhaust groove; 454. Second exhaust groove; 455. Rotating shaft; 456. Adjusting groove; 5. Distance sensor; 6. Gas supply rigid pipe; 61. Control valve; 7. High-pressure generator; 71. Connecting pipe; 72. High-pressure gas pipe; 8. Gas supply equipment.
[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0022] like Figure 1As shown, this utility model proposes a foam stabilizing device for a plastic blown film machine, including a cylindrical bracket 1, a mounting shaft 2, a limiting arm 4, and a driving component; Multiple mounting shafts 2 are rotatably connected to the cylindrical support 1 parallel to its length direction, and are evenly distributed along the circumference of the cylindrical support 1. The driving components include a first motor 3, a transmission wheel 31, and a transmission belt 32. The same end of each of the multiple mounting shafts 2 is coaxially fixed with a transmission wheel 31, and the multiple transmission wheels 31 are connected by the transmission belt 32, so that the multiple mounting shafts 2 can rotate synchronously. The first motor 3 is fixed on the cylindrical support 1, and the output end of the first motor 3 is connected to any one of the multiple mounting shafts 2. When the first motor 3 drives a mounting shaft 2 to rotate, the multiple mounting shafts 2 can rotate synchronously under the transmission action of the transmission wheel 31 and the transmission belt 32.
[0023] In an optional embodiment, the transmission wheel 31 includes a gear, and the transmission belt 32 includes a toothed belt. The toothed belt meshes with multiple gears, and the transmission mode of the toothed belt and gears has better synchronization and will not slip.
[0024] The mounting shaft 2 is equipped with multiple limiting arms 4. The limiting arms 4 are connected to the mounting shaft 2 perpendicular to its length, allowing them to be tangent to the outer walls of membrane bubbles of the same diameter. Furthermore, when the mounting shafts 2 rotate synchronously, the limiting arms 4 can swing synchronously, tangent to membrane bubbles of different diameters, thus limiting the diameter of the membrane bubbles (e.g., ...). Figure 2 (As shown).
[0025] Multiple limiting arms 4 are distributed along the length of the mounting shaft 2, and the limiting arms 4 on two adjacent mounting shafts 2 are staggered in the height direction, so that when the limiting arms 4 swing, the limiting arms 4 on two adjacent mounting shafts 2 can cross, increasing the swing range of the limiting arms 4 and enabling the restriction of small diameter membrane bubbles.
[0026] Combination Figure 3 , Figure 4 and Figure 5 As shown, the limiting arm 4 includes a bracket 41, a limiting tube 42, and an air supply hose 44. The bracket 41 is connected to the mounting shaft 2, and the limiting tube 42 is rotatably connected to the bracket 41. One end of the air supply hose 44 is connected to the limiting tube 42. The side wall of the limiting tube 42 is provided with an opening mounting groove 421 along the length direction, and the opening of the mounting groove 421 faces the outside of the limiting tube 42 radially. The mounting groove 421 is provided with a plurality of adjusting nozzles 45 for blowing air and adjusting the airflow size, and the plurality of adjusting nozzles 45 are evenly distributed along the length direction of the limiting tube 42. Rotate the limiting tube 42 so that the opening of the mounting groove 421 faces the membrane bubble. Gas is supplied into the limiting tube 42 through the gas delivery hose 44, and the regulating nozzles 45 are opened. Multiple regulating nozzles 45 blow air simultaneously, forming an air curtain blowing towards the membrane bubble in the direction of the opening of the mounting groove 421. Simultaneously, the airflow magnitude of each regulating nozzle 45 is adjusted according to the diameter of the membrane bubble to ensure that the pressure of the gas blown from each regulating nozzle 45 on the membrane bubble is consistent (e.g., ...). Figure 7 As shown, by applying an inward force to the membrane bubble through gas pressure, the diameter of the membrane bubble is limited. The membrane bubble does not contact the limiting tube 42, avoiding mutual friction and ensuring the production quality of the film. Furthermore, the airflow blown out by multiple adjusting nozzles 45 can increase the area on which the force is applied to the outer wall of the membrane bubble, improve the uniformity of the membrane bubble diameter, and reduce the diameter fluctuation range caused by too few force points.
[0027] Furthermore, when adjusting the position of the limiting arm 4, the vertical distance between the limiting tube 42 and the closest point of the membrane bubble is less than 1.5cm. This shortens the blowing distance of the adjusting nozzle 45 while ensuring that the membrane does not contact the limiting tube 42.
[0028] Thus, during use, the position of the limiting arm 4 is adjusted synchronously so that the limiting tube 42 is close to the membrane bubble, and the vertical distance between the limiting tube 42 and the closest point of the membrane bubble is less than 1.5cm. The blowing air volume of each regulating nozzle 45 is adjusted according to the diameter of the membrane bubble, and the pressure of the gas blown out by each regulating nozzle 45 on the membrane bubble is made consistent. The gas pressure applies an inward force to the membrane bubble, limiting the diameter of the membrane bubble. The membrane bubble does not contact the limiting tube 42, avoiding mutual friction and ensuring the production quality of the film.
[0029] In a specific embodiment, the other end of the gas delivery hose 44 is connected to a gas supply device 8, which delivers gas into the limiting tube 42 through the gas delivery hose 44.
[0030] Combination Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the bracket 41 is configured as a U-shaped structure with lugs at both ends. The two ends of the limiting tube 42 are rotatably connected to the lugs at both ends of the bracket 41. The bottom of the bracket 41 is configured as an arc-shaped structure corresponding to the shape of the limiting tube 42. A drainage gap 401 with an arc-shaped cross section is provided between the bracket 41 and the limiting tube 42. When multiple regulating nozzles 45 exhaust air at the same time, and the limiting tube 42 rotates to the point where the opening of the mounting groove 421 faces the drainage gap 401, the airflow blown out by the regulating nozzles 45 acts on the arc-shaped surface at the bottom of the bracket 41 and, guided by the drainage gap 401, can flow upward along the outer wall of the limiting tube 42. Since the airflow speed on the outer wall of the limiting tube 42 is relatively fast, a low-pressure area can be formed on the outside of the limiting tube 42, generating suction, thereby applying a force to the membrane to move towards one side of the limiting tube 42. Therefore, during the production process, when the membrane bubble deviates to one side due to factors such as airflow in the plant, the limiting tube 42 located on the opposite side of the deviated direction of the membrane bubble can be rotated so that the opening of the mounting groove 421 faces the drainage gap 401, so that a low-pressure area is formed on the outside of the limiting tube 42, thereby applying a force to the membrane to move to the opposite side of the deviated direction, correcting the verticality of the membrane bubble. After the correction is completed, the limiting tube 42 is rotated again so that the opening of the mounting groove 421 faces the membrane bubble, and airflow is blown towards the membrane bubble to limit the diameter of the membrane bubble. Meanwhile, when suction is applied to the film, the film will not come into contact with the limiting tube 42 because there is always an upward airflow on the surface of the limiting tube 42. Also, since the traction direction of the film is also upward, the flowing airflow will not exert a force on the film opposite to the traction direction. Therefore, when suction is applied to the film to correct its verticality, it will not affect the quality of the film.
[0031] Furthermore, since the vertical distance between the limiting tube 42 and the nearest point of the membrane bubble is less than 1.5cm when the position of the limiting arm 4 is adjusted, when the membrane bubble is tilted to one side, the vertical distance between the limiting tube 42 on the opposite side of the tilt and the nearest point of the membrane bubble is no more than 3.0cm. The suction force formed on the surface of the limiting tube 42 due to the low pressure area can act on the membrane, causing the membrane to move towards the limiting tube 42, thus avoiding the situation where the distance is too large and the suction force cannot act on the membrane.
[0032] In a specific embodiment, a second motor 43 is fixed to one end of the bracket 41 away from the gas delivery hose 44. The output end of the second motor 43 is connected to the limiting tube 42, and the limiting tube 42 is driven to rotate by the second motor 43.
[0033] In an optional embodiment, the second motor 43 is a stepper motor, and the rotation angle of the stepper motor can be precisely controlled so that when the limit tube 42 is driven to rotate, the opening of the mounting slot 421 can be precisely rotated to the designated position.
[0034] Combination Figure 1As shown, multiple circumferentially evenly distributed distance sensors 5 are fixed at the top and bottom of the cylindrical support 1. These sensors can monitor the verticality of the membrane bubble within the cylindrical support 1. The smaller the difference between the multiple distance sensors 5, the better the verticality of the membrane bubble. When the difference increases, it indicates that the membrane bubble is tilted. Based on the monitoring data of the distance sensors 5, the tilt direction of the membrane bubble is determined. When the distance value measured by the distance sensor 5 decreases, it indicates that the membrane bubble is moving closer to the distance sensor 5. When the distance value measured by the distance sensor 5 increases, it indicates that the membrane bubble is moving away from the distance sensor 5.
[0035] In an optional embodiment, the ranging sensor 5 is an ultrasonic ranging sensor.
[0036] It should be understood that multiple distance sensors 5 are all connected to the control terminal of the blown film machine, and the monitoring signals of the distance sensors 5 can be displayed on the control terminal in real time.
[0037] Combination Figure 8 As shown, the gas supply device 8 is connected to the gas delivery hose 44 via the gas delivery rigid pipe 6. The gas delivery rigid pipe 6 is equipped with a control valve 61. By opening and closing the control valve 61, the gas delivery rigid pipe 6 can be cut off / opened. An ion wind module is provided on one side of the gas delivery rigid pipe 6. The ion wind module includes a high-pressure generator 7 and a connecting pipe 71. The output end of the high-pressure generator 7 is connected to the gas delivery rigid pipe 6 via the connecting pipe 71. The output end of the high-pressure generator 7 is also connected to a high-pressure air pipe 72. The high-pressure generator 7 can generate positive and negative charge air masses. The airflow blown by the high-pressure air pipe 72 transports the positive and negative charge air masses generated by the high-pressure generator 7 to the gas delivery rigid pipe 6 via the connecting pipe 71. Then, it is blown to the surface of the membrane bubble in sequence through the gas delivery rigid pipe 6, the gas delivery hose 44, the limiting pipe 42, and the regulating nozzle 45. The positive and negative charges undergo a neutralization reaction, removing the static electricity generated by the friction between the membrane bubble and the air, and preventing the membrane bubble from adsorbing dust in the air due to static electricity.
[0038] Furthermore, the high-pressure air pipe 72 is connected to the air supply device 8, and the air supply device 8 supplies airflow to the output end of the high-pressure generator 7 through the high-pressure air pipe 72.
[0039] Combination Figure 7 As shown, the air nozzle 45 can be either electrically controlled or manually controlled. Since the blown film machine will produce plastic film of the same specification for a long time in actual production and will not frequently switch production specifications, and the purchase cost of the electrically controlled air nozzle 45 is relatively high, the manually controlled air nozzle 45 is preferred.
[0040] Combination Figure 9As shown, the regulating nozzle 45 includes an air pipe 451 and an adjusting plate 452. The air pipe 451 is a round pipe with an opening at one end. The open end of the air pipe 451 is connected to the mounting groove 421 and communicates with the inside of the limiting tube 42. The adjusting plate 452 is rotatably connected to the end face of the other end of the air pipe 451. The end face of the air pipe 451 is provided with a plurality of circumferentially distributed first exhaust grooves 453. The adjusting plate 452 is provided with second exhaust grooves 454 corresponding to the first exhaust grooves 453. By rotating the adjusting plate 452, the overlapping area of the first exhaust groove 453 and the second exhaust groove 454 is adjusted, thereby adjusting the output airflow of the adjusting nozzle 45.
[0041] Furthermore, the center of the adjusting plate 452 is provided with a rotating shaft 455. The adjusting plate 452 is rotatably connected to the end face of the air pipe 451 through the rotating shaft 455. By rotating the rotating shaft 455, the adjusting plate 452 can be rotated. In an optional embodiment, the end of the rotating shaft 455 away from the air pipe 451 is provided with an adjustment groove 456. The adjustment groove 456 is set as a regular hexagonal groove. An internal hex wrench can be used to engage with the adjustment groove 456, and then the rotating shaft 455 can be rotated to improve the convenience of adjustment.
[0042] The working principle of this utility model is as follows: Based on the diameter of the produced bubble, multiple mounting shafts 2 are driven to rotate synchronously by the first motor 3. The limiting arm 4 on the mounting shaft 2 swings closer to the bubble, making the vertical distance between the limiting tube 42 and the closest point of the bubble less than 1.5cm. The limiting tube 42 is rotated so that the opening of the mounting groove 421 faces the bubble. The air supply device 8 delivers gas into the limiting tube 42 through the air delivery hose 44. The regulating nozzles 45 are opened, and multiple regulating nozzles 45 blow air simultaneously, forming an air curtain blowing towards the bubble in the direction of the opening of the mounting groove 421. At the same time, the airflow of each regulating nozzle 45 is adjusted according to the diameter of the bubble, so that the pressure of the gas blown out by each regulating nozzle 45 on the bubble is consistent (e.g., ...). Figure 7 As shown, the gas pressure applies an inward force to the membrane bubble, limiting the diameter of the membrane bubble, and the membrane bubble does not contact the limiting tube 42, avoiding mutual friction and ensuring the production quality of the film. In addition, the airflow blown out by multiple adjusting nozzles 45 can increase the area of force applied to the outer wall of the membrane bubble, improve the uniformity of the membrane bubble diameter, and reduce the diameter fluctuation range caused by too few force points. During production, if the membrane bubble tilts to one side due to factors such as airflow in the plant, the limiting tube 42 located on the opposite side of the tilt can be rotated so that the opening of the mounting groove 421 faces the drainage gap 401. When multiple regulating nozzles 45 exhaust air simultaneously, the airflow acts on the arc-shaped surface at the bottom of the support 41 and, guided by the drainage gap 401, flows upward along the outer wall of the limiting tube 42. Because the airflow velocity on the outer wall of the limiting tube 42 is relatively fast, a low-pressure area can be formed on the outside of the limiting tube 42, generating suction, thereby applying a limiting force to the membrane. The force exerted by the movement of tube 42 on one side means that when the membrane bubble deviates to one side due to factors such as airflow in the plant, the limiting tube 42 located on the opposite side of the deviated direction of the membrane bubble can be rotated so that the opening of the mounting groove 421 faces the drainage gap 401, so that a low-pressure area is formed on the outside of the limiting tube 42, thereby applying a force to the membrane to move to the opposite side of the deviated direction, correcting the verticality of the membrane bubble. After the correction is completed, the limiting tube 42 is rotated again so that the opening of the mounting groove 421 faces the membrane bubble, and airflow is blown towards the membrane bubble to limit the diameter of the membrane bubble.
[0043] In summary, by providing multiple regulating nozzles 45 on the limiting tube 42 tangential to the membrane bubble, the regulating nozzles 45 blow airflow towards the membrane bubble, and the airflow magnitude of each regulating nozzle 45 is adjusted according to the diameter of the membrane bubble, so that the pressure of the gas blown out by each regulating nozzle 45 on the membrane bubble is consistent (e.g., Figure 7 As shown, by applying an inward force to the membrane bubble through gas pressure, the diameter of the membrane bubble is limited. The membrane bubble does not contact the limiting tube 42, thus avoiding mutual friction and ensuring the production quality of the film. Furthermore, the airflow blown out by multiple adjusting nozzles 45 can increase the area on which the force is applied to the outer wall of the membrane bubble, improve the uniformity of the membrane bubble diameter, and reduce the diameter fluctuation range caused by too few force points. By setting an arc-shaped drainage gap 401 between the support 41 and the limiting tube 42, when the opening of the mounting groove 421 faces the drainage gap 401, the airflow can flow upward along the outer wall of the limiting tube 42 under the guidance of the drainage gap 401. Since the airflow velocity on the outer wall of the limiting tube 42 is relatively fast, a low-pressure area can be formed on the outside of the limiting tube 42, generating suction, thereby applying a force to the membrane to move to one side of the limiting tube 42, which can correct the verticality of the membrane bubble.
[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
[0046] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. A bubble stabilizing device for a plastic blown film machine, characterized in that, It includes a cylindrical bracket (1) and multiple mounting shafts (2), the mounting shafts (2) being rotatably connected to the cylindrical bracket (1) parallel to the length direction of the cylindrical bracket (1), and the multiple mounting shafts (2) being evenly distributed along the circumference of the cylindrical bracket (1); The mounting shaft (2) is provided with a plurality of limiting arms (4), the limiting arms (4) are connected to the mounting shaft (2) perpendicular to the length direction of the mounting shaft (2), and the plurality of limiting arms (4) are distributed along the length direction of the mounting shaft (2); The limiting arm (4) includes a bracket (41) and a limiting tube (42). The bracket (41) is connected to the mounting shaft (2), and the limiting tube (42) is rotatably connected to the bracket (41). The sidewall of the limiting tube (42) is provided with an open mounting groove (421) along the length direction, and the opening of the mounting groove (421) is radially toward the outside of the limiting tube (42). The mounting groove (421) is provided with a plurality of adjusting nozzles (45) for blowing air and adjusting the airflow size, and the plurality of adjusting nozzles (45) are evenly distributed along the length direction of the limiting tube (42).
2. The foam stabilizing device for a plastic blown film machine according to claim 1, characterized in that: The bracket (41) is configured as a U-shaped structure with lugs at both ends. The two ends of the limiting tube (42) are respectively rotatably connected to the lugs at both ends of the bracket (41). The bottom of the bracket (41) is configured as an arc-shaped structure that matches the shape of the limiting tube (42). A drainage gap (401) with an arc-shaped cross section is provided between the bracket (41) and the limiting tube (42). When multiple regulating nozzles (45) blow air simultaneously, and the limiting tube (42) rotates to the point where the opening of the mounting groove (421) faces the drainage gap (401), the drainage gap (401) can guide the airflow to flow upward along the outer wall of the limiting tube (42) and form a low-pressure area on the outside of the limiting tube (42).
3. The foam stabilizing device for a plastic blown film machine according to claim 2, characterized in that: One end of the bracket (41) is fixed with a second motor (43), and the output end of the second motor (43) is connected to the limiting tube (42) to drive the limiting tube (42) to rotate.
4. The foam stabilizing device for a plastic blown film machine according to claim 1, characterized in that: Multiple circumferentially evenly distributed distance sensors (5) are fixed at both the top and bottom of the cylindrical support (1).
5. The foam stabilizing device for a plastic blown film machine according to claim 1, characterized in that: The limiting arm (4) also includes a gas delivery hose (44), one end of which is connected to the limiting tube (42), and the other end of which is connected to a gas supply device (8). The gas supply device (8) delivers gas to the limiting tube (42) through the gas delivery hose (44). The gas supply device (8) is connected to the gas delivery hose (44) through a gas delivery hard pipe (6), and a control valve (61) is provided on the gas delivery hard pipe (6).
6. The foam stabilizing device for a plastic blown film machine according to claim 5, characterized in that: It also includes an ion wind module for removing static electricity, the output of which is connected to the gas delivery pipe (6).
7. The foam stabilizing device for a plastic blown film machine according to claim 1, characterized in that: The regulating nozzle (45) includes an air pipe (451) and an adjusting plate (452). The air pipe (451) is a round pipe with an opening at one end. The open end of the air pipe (451) is connected to the mounting groove (421) and communicates with the inside of the limiting tube (42). The adjusting plate (452) is rotatably connected to the end face of the other end of the air pipe (451). The end face of the air pipe (451) is provided with a plurality of circumferentially distributed first exhaust grooves (453). The adjusting plate (452) is provided with second exhaust grooves (454) corresponding to the first exhaust grooves (453).
8. The foam stabilizing device for a plastic blown film machine according to claim 7, characterized in that: The center of the adjusting plate (452) is provided with a rotating shaft (455), and the adjusting plate (452) is rotatably connected to the air pipe (451) through the rotating shaft (455). The end of the rotating shaft (455) away from the air pipe (451) is provided with an adjusting groove (456).
9. The foam stabilizing device for a plastic blown film machine according to claim 1, characterized in that: The cylindrical bracket (1) is provided with a driving component, which includes a first motor (3), a transmission wheel (31) and a transmission belt (32). The same end of the plurality of mounting shafts (2) is coaxially fixed with the transmission wheel (31). The plurality of transmission wheels (31) are connected by the transmission belt (32) so that the plurality of mounting shafts (2) can rotate synchronously. The first motor (3) is fixed on the cylindrical bracket (1), and the output end of the first motor (3) is connected to any one of the plurality of mounting shafts (2).
10. The foam stabilizing device for a plastic blown film machine according to claim 9, characterized in that: The transmission wheel (31) includes a gear, and the transmission belt (32) includes a toothed belt that meshes with a plurality of the gears.