Three-in-one automatic air ring structure of blown film machine

Abstract

This invention relates to the field of blow molding machine technology, specifically to a three-in-one automatic air ring structure for blown film machines, and a guiding component. The structure includes an upper air plate mounted on the top side wall of an annular groove near the air outlet, a lower air plate slidably mounted on the bottom side wall of the annular groove near the air outlet, a second guide plate obliquely mounted on the upper air plate near the air outlet, and a first guide ring vertically mounted on the top wall of the first guide plate. When the lower air plate moves downwards, a temperature control component increases the heater temperature. This solution incorporates a guiding component at the air outlet to guide the airflow direction. By adjusting the positions of the upper and lower air plates, the final air velocity and air volume at the air outlet can be changed. This ensures minimal fluctuations in air velocity and temperature when adjusting air volume, and similarly, minimal fluctuations in air temperature when adjusting air velocity. This approach improves production efficiency while maintaining production quality, and enhances the flexibility of thermoforming plastic films.

Description

Technical Field

[0001] This invention relates to the field of blow molding machine technology, specifically to a three-in-one automatic air ring structure for blown film machines. Background Technology

[0002] With the advancement of human technology, plastic film has replaced most paper packaging, resulting in a huge demand for film. Film can be formed using the flat extrusion blow molding method. In this method, after the plastic raw material is melted in the extruder, it is extruded through the flow channel formed between the die head and the mold core of the blow molding die to form a thin-walled tube. Then, compressed air inflates the thin-walled tube to form a film tube. At the same time, the film tube is cooled by the air ring device. The cooled film tube is then clamped flat by the herringbone plate to form a laminated film. Finally, the film is pulled onto the winding roller by the traction roller for winding.

[0003] The existing air ring structure simply guides the hot air, and the adjustment of the air speed still relies solely on the completed fan, which is not flexible enough. In addition, the ventilation volume and air speed in the air ring cannot be automatically adjusted with the air temperature, which reduces the impact on the production quality and efficiency of the film. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a three-in-one automatic air ring structure for blown film machines, which effectively solves the problem that the air temperature does not automatically adjust when the air volume and air speed are adjusted in existing technologies.

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

[0006] This invention provides a three-in-one automatic air ring structure for a blown film machine, including an annular housing, an annular groove formed in the annular housing, and an air outlet formed on the inner wall of the annular housing. Multiple air inlet pipes are provided on the outer wall of the annular housing, and a heater is provided in the annular groove. The invention also includes:

[0007] A guiding assembly for guiding airflow at an air outlet includes an upper air plate installed on the side wall of an annular groove near the top of the air outlet, a lower air plate slidably installed on the side wall of the annular groove near the bottom of the air outlet, a second guide plate obliquely installed on the side of the upper air plate near the air outlet, and a second guide ring vertically installed on the top of the second guide plate, and a first guide plate obliquely installed on the side wall of the lower air plate, with a first guide ring vertically provided on the top wall of the first guide plate.

[0008] When the lower wind plate moves down, the upper wind plate moves away from the air outlet. At this time, the distance between the first guide plate and the second guide plate is equal to the distance between the first guide ring and the second guide ring. When the upper wind plate moves up, the distance between the first guide plate and the second guide plate is greater than the distance between the first guide ring and the second guide ring.

[0009] A temperature control component is used to stabilize the air temperature between the first guide ring and the second guide ring, and to increase the temperature of the heater when the lower air plate moves down.

[0010] Furthermore, the guide assembly also includes a second electric actuator fixedly mounted on the bottom wall of the annular groove, the second electric actuator being used to drive the lower wind vane to rise and fall.

[0011] Furthermore, a second piston tube is fixedly installed on the upper air plate, and a second piston rod is movably inserted into the second piston tube. The end of the second piston rod away from the second piston tube is fixedly connected to the side wall of the annular groove. A third piston tube is fixedly installed on the bottom wall of the annular groove, and a third piston rod is movably inserted into the third piston tube. The third piston rod moves synchronously with the output shaft of the second electric actuator. A connecting pipe connects the second piston tube and the third piston tube.

[0012] Furthermore, the downwind plate and the first guide ring are both annular, the first guide plate is funnel-shaped, the upwind plate and the second guide ring are both arc plates, a first elastic plate is connected between adjacent upwind plates, a second elastic plate is connected between adjacent second guide rings, there are multiple second guide plates, and the number is the same as that of the upwind plate and the second guide ring, a third elastic plate is connected between adjacent second guide plates.

[0013] Furthermore, a slide is slidably installed on the inner wall of the annular groove, and a third electric push rod for driving the slide to rise and fall is provided on the top wall of the annular groove. A partition is fixedly installed on the side of each upper air plate away from the air outlet, and a fourth elastic plate is connected between adjacent partitions. The partitions are slidably installed on the top wall of the slide.

[0014] Furthermore, a first sliding rheostat is fixedly installed on the partition plate, a first piston tube is installed on the top wall of the annular groove, and a first piston rod is movably inserted into the lower end of the first piston tube. A first sliding plate matching the first sliding rheostat is fixedly installed at the bottom end of the first piston rod. An elastic air bladder is connected between the top wall of the first piston tube and the side wall of the annular groove. When the upper air plate is away from the air outlet, the gas in the elastic air bladder enters the first piston tube, causing the first piston rod to move downward. When the first sliding plate moves downward, the wind speed of the air inlet pipe increases.

[0015] Furthermore, the temperature control component includes a second sliding rheostat fixedly mounted on the partition plate, a first electric actuator slidably mounted on the top wall of the annular groove, a second slider matching the second sliding rheostat elastically mounted on the output shaft of the first electric actuator, a fixed ring provided on the annular housing, and a temperature sensor provided on the inner wall of the fixed ring, the temperature sensor being connected to an external processor and a controller, the controller being used to control the first electric actuator.

[0016] Furthermore, a fixing frame is fixedly installed on the outer wall of the first electric actuator, two wedge blocks are fixedly installed on both sides of the second slide plate, two slide rods are slidably installed below the fixing frame, and a return spring is provided at the sliding connection. A pressing block for pressing the wedge blocks to move downward is installed on the slide rod, and a fixing rod is fixedly installed on the side wall of the slide rod.

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0018] This solution incorporates a guide component at the air outlet to direct the airflow. By adjusting the positions of the upper and lower air plates, the final air velocity and volume at the outlet can be altered. This ensures minimal fluctuations in air velocity and temperature when adjusting air volume, and similarly, minimal fluctuations in air temperature when adjusting air velocity. This approach aims to improve production efficiency while maintaining production quality, thereby enhancing the flexibility of thermoplasticizing plastic films. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is an overall schematic diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 for Figure 2 The front view;

[0023] Figure 4 for Figure 3 Enlarged view of the structure of part A in the middle;

[0024] Figure 5 This is a schematic diagram of the upper wind plate portion in this invention;

[0025] Figure 6 This is a schematic diagram of the structure of the lower windshield section in this invention;

[0026] Figure 7 This is a schematic diagram of the structure of a portion of the temperature control component in this invention;

[0027] Figure 8 This is a front view of the temperature control assembly in this invention;

[0028] Figure 9This is a diagram showing the airflow direction in this invention;

[0029] Figure 10 This is a state diagram showing the increase in ventilation volume in this invention;

[0030] Figure 11 This is a state diagram when the wind speed is increased in this invention.

[0031] The labels in the diagram represent: 1. Annular shell; 2. Air inlet pipe; 3. Fixing ring; 4. Temperature sensor; 5. Annular groove; 6. Air outlet; 7. Lower air plate; 8. First guide ring; 9. First guide plate; 10. Upper air plate; 11. Second guide plate; 12. Second guide ring; 13. First elastic plate; 14. Second elastic plate; 15. Partition plate; 16. Fourth elastic plate; 17. Slide; 18. First sliding rheostat; 19. First slider; 20. First piston tube; 21. Second sliding rheostat; 22. Second slider; 23. First electric push rod; 24. Wedge block; 25. Fixing frame; 26. Fixing rod; 27. Discharge ring; 28. Extrusion block; 29. ​​Second piston tube; 30. Second electric push rod; 31. Third piston tube; 32. Third piston rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to embodiments.

[0034] Example: Reference Figure 1-2 The blown film machine features a three-in-one automatic air ring structure, including an annular housing 1, an annular groove 5 within the annular housing 1, and an air outlet 6 on the inner wall of the annular housing 1. Multiple air inlet pipes 2 are located on the outer wall of the annular housing 1. A heater is installed in the annular groove 5. A discharge ring 27 is located in the center of the annular housing 1. The discharge ring 27 transports the raw material for the plastic film, which is then thermoformed and transported by hot air blown from the air outlet 6. The machine also includes:

[0035] refer to Figure 1-11The guiding assembly, used to guide the airflow of the air outlet 6, includes an upper air plate 10 installed on the side wall of the annular groove 5 near the top of the air outlet 6, a lower air plate 7 slidably installed on the side wall of the annular groove 5 near the bottom of the air outlet 6, a second guide plate 11 obliquely installed on the side of the upper air plate 10 near the air outlet 6, and a second guide ring 12 vertically installed at the top of the second guide plate 11, a first guide plate 9 obliquely installed on the side wall of the lower air plate 7, and a first guide ring 8 vertically provided on the top wall of the first guide plate 9. The guiding assembly also includes a second electric actuator 30 fixedly installed on the bottom wall of the annular groove 5. The lower air plate 7 and the first guide ring 8 are both annular, the first guide plate 9 is funnel-shaped, the upper air plate 10 and the second guide ring 12 are both arc plates, and a first elastic plate connects adjacent upper air plates 10. 13. A second elastic plate 14 is connected between adjacent second guide rings 12. There are multiple second guide plates 11, and the number is the same as that of the upper wind plate 10 and the second guide ring 12. A third elastic plate is connected between adjacent second guide plates 11. A second electric push rod 30 is used to drive the lower wind plate 7 to rise and fall. A second piston tube 29 is fixedly installed on the upper wind plate 10. A second piston rod is movably inserted on the second piston tube 29. The end of the second piston rod away from the second piston tube 29 is fixedly connected to the side wall of the annular groove 5. A third piston tube 31 is fixedly installed on the bottom wall of the annular groove 5. A third piston rod 32 is movably inserted on the third piston tube 31. The third piston rod 32 moves synchronously with the output shaft of the second electric push rod 30. A connecting pipe is connected between the second piston tube 29 and the third piston tube 31.

[0036] When the lower air plate 7 moves downward, the upper air plate 10 moves away from the air outlet 6. At this time, the distance between the first guide plate 9 and the second guide plate 11 is equal to the distance between the first guide ring 8 and the second guide ring 12. When the upper air plate 10 moves upward, the distance between the first guide plate 9 and the second guide plate 11 is greater than the distance between the first guide ring 8 and the second guide ring 12. A slide 17 is slidably installed on the inner wall of the annular groove 5. A third electric push rod for driving the slide 17 to rise and fall is provided on the top wall of the annular groove 5. A partition 15 is fixedly installed on the side of each upper air plate 10 away from the air outlet 6. A fourth elastic plate 16 is connected between adjacent partitions 15. Plate 15 is slidably mounted on the top wall of slide 17. A first sliding rheostat 18 is fixedly mounted on plate 15. A first piston tube 20 is mounted on the top wall of annular groove 5. A first piston rod is movably inserted into the lower end of the first piston tube 20. A first sliding plate 19 matching the first sliding rheostat 18 is fixedly mounted at the bottom end of the first piston rod. An elastic air bag is connected between the top wall of the first piston tube 20 and the side wall of annular groove 5. When the upper air plate 10 is away from the air outlet 6, the gas in the elastic air bag enters the first piston tube 20, causing the first piston rod to move down. When the first sliding plate 19 moves down, the wind speed of the air inlet pipe 2 increases.

[0037] To facilitate the control of airflow and velocity within the air ring, this design includes a first guide ring 8, a second guide ring 12, a first guide plate 9, and a second guide plate 11, as follows: Figure 9 As shown, the initial airflow is horizontal. Guided by the first guide ring 9 and the second guide ring 12, the airflow is tilted. Then, guided by the space between the first guide plate 8 and the second guide plate 11, the airflow is vertical. The vertical airflow blows onto the plastic film raw material to complete thermoforming and feeding.

[0038] To facilitate the adjustment of airflow and air speed, this design allows for control of airflow and air speed by adjusting the positions of the upper air panel 10 and the lower air panel 7. Specifically:

[0039] When it is necessary to increase the air volume while ensuring that the wind speed fluctuates, the lower air vane 7 is driven to move downward by controlling the second electric actuator 30, such as... Figure 10 As shown, when the lower air plate 7 moves down, the third piston rod 32 moves down together with the output shaft of the second electric push rod 30. When the third piston rod 32 moves down, the air in the third piston tube 31 is compressed and enters the second piston tube 29 through the connecting pipe. The second piston rod extends out of the second piston tube 29, so that the upper air plate 10 moves away from the air outlet 6. During the downward movement of the lower air plate 7, the distance between the first guide ring 9 and the second guide ring 11 increases. Consequently, as the upper air plate 10 moves away from the air outlet 6, the distance between the first guide plate 8 and the second guide plate 12 also increases. This causes an overall change in the size of the airflow guiding channel, preventing airflow turbulence and ensuring airflow stability. As the upper air plate 10 moves away from the air outlet 6, it compresses the elastic airbag, and the air inside the elastic airbag enters the first piston tube 20. The first piston rod moves downward, changing the resistance value of the first sliding rheostat 18, thereby increasing the wind speed of the external fan. This increases the airflow speed of the air inlet pipe 2, which in turn increases the air intake per unit time. The size of the guiding air duct at the air outlet 6 also increases, thus increasing the ventilation volume. Overall, the wind speed does not change much compared to before the adjustment, thereby achieving the goal of increasing ventilation volume while ensuring minimal wind speed fluctuation.

[0040] When a simple increase in wind speed is needed, simply activate the third electric actuator to drive the slide 17 upwards. The slide 17, along with the partition 15, moves upwards, thereby causing the first sliding rheostat 18 to move upwards, while the position of the first sliding plate 19 remains unchanged. This increases the wind speed provided by the external fan. Figure 11As shown, when the upper air plate 10 moves upward, the distance between the first guide plate 8 and the second guide plate 12 will not change. The increase in overall wind speed can be regarded as an increase in ventilation volume per unit time. Although the distance between the first guide ring 9 and the second guide ring 11 will change, since the air outlet end does not change, the air outlet efficiency still depends on the narrower air outlet position, so the overall wind speed will increase.

[0041] refer to Figure 1-11 The temperature control component is used to stabilize the air temperature between the first guide ring 8 and the second guide ring 12. When the downwind plate 7 moves down, it increases the temperature of the heater. The temperature control component includes a second sliding rheostat 21 fixedly mounted on the partition plate 15. A first electric push rod 23 is slidably mounted on the top wall of the annular groove 5. A second sliding plate 22 that matches the second sliding rheostat 21 is elastically mounted on the output shaft of the first electric push rod 23 (it is worth noting that the elastic mounting method can be a connecting spring or an elastic rod, that is, relative displacement can be generated between the two). A fixing ring 3 is provided on the housing 1, and a temperature sensor 4 is provided on the inner wall of the fixing ring 3. The temperature sensor 4 is connected to an external processor and a controller. The controller is used to control the first electric push rod 23. A fixing frame 25 is fixedly installed on the outer wall of the first electric push rod 23. Two wedge blocks 24 are fixedly installed on both sides of the second slide plate 22. Two slide rods are slidably installed below the fixing frame 25, and a return spring is provided at the sliding connection. A pressing block 28 for pressing the wedge blocks 24 to move downward is installed on the slide rod 33. A fixing rod 26 is fixedly installed on the side wall of the slide rod 33.

[0042] To ensure the stability of the air temperature, this solution sets a temperature sensor 4 on the inner wall of the fixed ring 3 to monitor the temperature of the air flowing through it in real time and send it to the processor. The processor then controls the first electric push rod 23 to drive the second slider 22 to move up and down, thereby changing the resistance of the second sliding rheostat 21 connected to the heater, thus achieving the purpose of temperature control.

[0043] To ensure minimal fluctuation in air velocity at outlet 6 during the aforementioned airflow changes, while maintaining a larger overall ventilation volume, resulting in a lower air temperature at outlet 6 under the same heating effect, this solution incorporates a fixing bracket 25 on the outside of the first electric push rod 23. As the upper air plate 10 moves away from outlet 6, the first electric push rod 23 slides towards the edge of the annular groove 5 (closer to the outer ring), causing the inner wall of the annular groove 5 to press against the fixing rod 26. This, in turn, moves the sliding rod 33 and the pressing block 28 towards the wedge block 24, pressing the wedge block 24 downwards. This, in turn, causes the second sliding plate 22 to move downwards, thereby increasing the heater temperature. This further ensures temperature stability even with increased airflow.

[0044] During the process of increasing the wind speed, the internal ventilation volume also increases, the overall airflow velocity increases, and the time for the air to be heated is shortened. Therefore, it is also necessary to increase the temperature of the heater to ensure the stability of the air temperature. When the slide 17 and the partition 15 move upward, the second slide plate 22 moves downward relative to the second sliding rheostat 21, that is, the temperature increases, thereby further ensuring the stability of the air temperature.

[0045] It is worth noting that the set temperature of the air temperature can be modified by the processor, that is, the initial position of the second slider 22 can be controlled.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-in-one automatic air ring structure for a blown film machine, comprising an annular housing (1), an annular groove (5) formed in the annular housing (1), and an air outlet (6) formed on the inner annular wall of the annular housing (1), wherein multiple air inlet pipes (2) are provided on the outer wall of the annular housing (1), and a heater is provided in the annular groove (5), characterized in that, Also includes: A guiding assembly for guiding the airflow of the air outlet (6) includes an upper air plate (10) installed on the side wall of the annular groove (5) near the top of the air outlet (6), a lower air plate (7) slidably installed on the side wall of the annular groove (5) near the bottom of the air outlet (6), a second guide plate (11) obliquely installed on the side of the upper air plate (10) near the air outlet (6), and a second guide ring (12) vertically installed on the top of the second guide plate (11), a first guide plate (9) obliquely installed on the side wall of the lower air plate (7), and a first guide ring (8) vertically provided on the top wall of the first guide plate (9); The guide assembly also includes a second electric actuator (30) fixedly installed on the bottom wall of the annular groove (5), the second electric actuator (30) being used to drive the lower air plate (7) to rise and fall; each of the upper air plates (10) has a partition (15) fixedly installed on the side away from the air outlet (6). A second piston tube (29) is fixedly installed on the upper air plate (10). A second piston rod is movably inserted on the second piston tube (29). The end of the second piston rod away from the second piston tube (29) is fixedly connected to the side wall of the annular groove (5). A third piston tube (31) is fixedly installed on the bottom wall of the annular groove (5). A third piston rod (32) is movably inserted on the third piston tube (31). The third piston rod (32) moves synchronously with the output shaft of the second electric push rod (30). A connecting pipe is connected between the second piston tube (29) and the third piston tube (31). When the lower air plate (7) moves down, the third piston rod (32) moves down under the drive of the second electric push rod (30) and squeezes the gas in the third piston tube (31). The gas enters the second piston tube (29) through the connecting pipe and pushes the second piston rod to extend, thereby driving the upper air plate (10) away from the air outlet (6) and making the distance between the first guide plate (9) and the second guide plate (11) equal to the distance between the first guide ring (8) and the second guide ring (12). A temperature control assembly is used to stabilize the air temperature between the first guide ring (8) and the second guide ring (12). The temperature control assembly includes a second sliding rheostat (21) fixedly installed on the partition plate (15). A first electric push rod (23) is slidably installed on the top wall of the annular groove (5). A second slider (22) matching the second sliding rheostat (21) is elastically installed on the output shaft of the first electric push rod (23). A fixed ring (3) is provided on the annular housing (1), and a temperature sensor (4) is provided on the inner wall of the fixed ring (3). The temperature sensor (4) is connected to an external processor and a controller. The controller is used to control the first electric push rod (23) to adjust the relative position of the second slider (22) and the second sliding rheostat (21) to adjust the temperature of the heater. A fixing frame (25) is fixedly installed on the outer wall of the first electric actuator (23). Two wedge blocks (24) are fixedly installed on both sides of the second slide plate (22). Two slide rods (33) are slidably installed below the fixing frame (25), and a return spring is provided at the sliding connection. A pressing block (28) for pressing the wedge blocks (24) to move down is installed on the slide rod (33). A fixing rod (26) is fixedly installed on the side wall of the slide rod (33). When the lower air plate (7) moves down and the upper air plate (10) moves away from the air outlet (6), the first electric push rod (23) slides along with the upper air plate (10) toward the edge of the annular groove (5), and the inner wall of the annular groove (5) squeezes the fixing rod (26) to drive the squeezing block (28) to squeeze the wedge block (24) and cause the second sliding plate (22) to move down, thereby increasing the temperature of the heater.

2. The three-in-one automatic air ring structure for blown film machines according to claim 1, characterized in that, The downwind plate (7) and the first guide ring (8) are both circular rings. The first guide plate (9) is in the shape of an inverted funnel. The upwind plate (10) and the second guide ring (12) are both arc plates. A first elastic plate (13) is connected between adjacent upwind plates (10). A second elastic plate (14) is connected between adjacent second guide rings (12). There are multiple second guide plates (11), and the number is the same as that of the upwind plate (10) and the second guide ring (12). A third elastic plate is connected between adjacent second guide plates (11).

3. The three-in-one automatic air ring structure for blown film machines according to claim 2, characterized in that, The inner wall of the annular groove (5) is slidably mounted with a slide (17). The top wall of the annular groove (5) is provided with a third electric push rod for driving the slide (17) to rise and fall. A fourth elastic plate (16) is connected between adjacent partitions (15). The partitions (15) are slidably mounted on the top wall of the slide (17).

4. The three-in-one automatic air ring structure for blown film machines according to claim 3, characterized in that, A first sliding rheostat (18) is fixedly installed on the partition plate (15). A first piston tube (20) is installed on the top wall of the annular groove (5). A first piston rod is movably inserted at the lower end of the first piston tube (20). A first sliding plate (19) matching the first sliding rheostat (18) is fixedly installed at the bottom end of the first piston rod. An elastic airbag is connected between the top wall of the first piston tube (20) and the side wall of the annular groove (5). When the upper air plate (10) is far away from the air outlet (6), the gas in the elastic airbag enters the first piston tube (20), causing the first piston rod to move down. When the first sliding plate (19) moves down, the wind speed of the air inlet pipe (2) increases.

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