Air duct adjusting structure and blown film equipment cooling air ring

Abstract

The utility model is suitable for the technical field of plastic film processing equipment, provides a kind of air duct adjusting structure and blow film equipment cooling air ring.The air duct adjusting structure includes: air ring inner core, including first inner core and second inner core, the first inner core is sheathed in the upper of second inner core, radial air duct is left between two, the first inner core bottom, located in the radial air duct vertical direction is provided with annular groove;A plurality of air duct adjusting components are distributed in the annular groove in annular array;The air duct adjusting component includes threaded push rod, wind block and elastic part, the threaded push rod is passed through the first inner core, and extends into the annular groove, and is rotationally connected with the first inner core, and the threaded push rod tail end is connected with the wind block screw thread;The elastic part is arranged in the annular groove, and two ends are respectively connected with the wind block and the annular groove, and the wind block is slidably connected with the annular groove in axial direction.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic film processing equipment, and particularly relates to an air duct adjustment structure and a cooling air ring for blown film equipment. Background Technology

[0002] In plastic blown film processing, molten material is extruded from an annular die to form a film bubble, which is then rapidly cooled and shaped by the cold airflow of a cooling air ring. The uniformity of cooling directly affects the thickness consistency, mechanical properties, and surface quality of the film. Traditional cooling air rings typically employ a combination structure of an annular main air duct and radial guide channels, with airflow entering from the main air inlet and then being evenly distributed circumferentially to the annular air outlet.

[0003] However, existing cooling air rings are single-inlet rings, meaning the cooling air enters the ring from one side. This results in varying airflow forces in different directions within the ring's main air duct, often leading to uneven circumferential cooling of the film bubble during actual production. This causes localized film bubble thickness deviations, such as some points being too thick or too thin, thus affecting the quality of the finished film. Furthermore, thickness variations during die extrusion also contribute to uneven film thickness. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an air duct adjustment structure, which aims to solve the problem of local blown film thickness deviation.

[0005] This utility model embodiment is implemented as follows: an air duct adjustment structure, the air duct adjustment structure comprising: The inner core of the air ring includes a first inner core and a second inner core. The first inner core is fitted on top of the second inner core, and a radial air channel is left between the two. An annular groove is provided at the bottom of the first inner core in the direction perpendicular to the radial air channel. Several air duct adjustment components are arranged in a ring array within the annular groove. Each air duct adjustment component includes a threaded push rod, a wind deflector block, and an elastic element. The threaded push rod passes through the first inner core, extends into the annular groove, and is rotatably connected to the first inner core. The end of the threaded push rod is threadedly connected to the wind deflector block. The elastic element is disposed within the annular groove, with its two ends respectively connected to the wind deflector block and the annular groove. The wind deflector block is slidably connected to the annular groove in the axial direction.

[0006] Furthermore, the threaded push rod is an internal hexagon head screw, with the cylindrical head located above the first inner core. By rotating the cylindrical head, the wind deflector block is pushed up and down.

[0007] Furthermore, the elastic element is a compression spring, and two springs are provided, symmetrically arranged on both sides of the threaded push rod.

[0008] Another objective of this utility model is to provide a cooling air ring for a blown film equipment, the cooling air ring comprising: The aforementioned air duct adjustment structure; The air ring housing has the aforementioned air duct adjustment structure installed inside; The top cover of the air ring is installed on the outer shell of the air ring, forming a radial air duct and a circumferential air duct.

[0009] Furthermore, the cooling air ring of the blown film equipment also includes a split air duct assembly, which is disposed inside the air ring housing; The diversion duct assembly includes several diversion plates, which are inclined and arranged in a ring array on the inner circumference of the air ring shell, dividing the circumferential air duct into a first circumferential air duct and a second circumferential air duct. Ventilation openings are provided between two adjacent diversion plates. An air inlet is provided on the outer side of the air ring housing, and an air outlet is provided at the center of the inner core of the air ring; on the radial air duct, the airflow passes sequentially through the air inlet, the first circumferential air duct, the second circumferential air duct, the air duct adjustment component, and the air outlet.

[0010] The air duct adjustment structure provided in this embodiment of the invention has the following advantages: the air duct adjustment components are disposed inside the annular groove. By rotating the threaded push rod, the baffle block can be pushed downwards, causing the baffle block to block the radial air duct between the first inner core and the second inner core from an axial position. Since there are several air duct adjustment components, the aperture of the local air duct can be adjusted, thereby adjusting the airflow at the outlet, adjusting the local cooling rate of the film, and ultimately adjusting the local thickness of the film. In addition, this embodiment uses a threaded push rod to push the baffle block, which means that technicians can rotate the threaded push rod according to the actual film thickness to fine-tune the baffle block. Compared with the manual fine-tuning by linear automated equipment such as motors, the adjustment accuracy of this embodiment is higher. Attached Figure Description

[0011] Figure 1 A perspective view of the air duct adjustment structure provided in the embodiment of this utility model; Figure 2 An exploded view of the air duct adjustment structure provided in the embodiment of this utility model; Figure 3 A perspective view of the air duct adjustment assembly provided in an embodiment of this utility model; Figure 4 A partial cross-sectional view of the air duct adjustment structure provided in an embodiment of this utility model; Figure 5 An exploded view of the cooling air ring of the blown film equipment provided in this embodiment of the utility model; Figure 6A perspective view of the cooling air ring of the blown film equipment provided in the embodiment of this utility model (without the top cover of the air ring); Figure 7 A cross-sectional view of the cooling air ring of the blown film equipment provided in an embodiment of this utility model; 100. Inner core of the air ring; 110. First inner core; 111. Annular groove; 120. Second inner core; 200. Air duct adjustment assembly; 210. Threaded push rod; 220. Wind deflector; 230. Elastic element; 300. Wind ring casing; 400. Wind ring top cover; 500. Flow divider assembly; 510. Flow divider plate; 1. Air inlet; 2. First circumferential air duct; 3. Second circumferential air duct; 4. Air outlet. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0013] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but unless otherwise stated, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0014] In one embodiment, such as Figure 1-4 As shown, an air duct adjustment structure is proposed, the air duct adjustment structure comprising: The inner core 100 of the air ring includes a first inner core 110 and a second inner core 120. The first inner core 110 is fitted on top of the second inner core 120, and a radial air passage is left between the two. An annular groove 111 is provided at the bottom of the first inner core 110 in the direction perpendicular to the radial air passage. A plurality of air duct adjustment components 200 are arranged in a ring array within the annular groove 111. Each air duct adjustment component 200 includes a threaded push rod 210, a wind deflector block 220, and an elastic element 230. The threaded push rod 210 passes through the first inner core 110, extends into the annular groove 111, and is rotatably connected to the first inner core 110. The end of the threaded push rod 210 is threadedly connected to the wind deflector block 220. The elastic element 230 is disposed within the annular groove 111, with its two ends respectively connected to the wind deflector block 220 and the annular groove 111. The wind deflector block 220 is slidably connected to the annular groove 111 in the axial direction.

[0015] In this embodiment, as Figure 4As shown, the air duct adjustment component 200 is disposed inside the annular groove 111. By rotating the threaded push rod 210, the baffle block 220 can be pushed downward, causing the baffle block 220 to block the radial air duct between the first inner core 110 and the second inner core 120 from an axial position. Since there are several air duct adjustment components 200, the aperture of the local air duct can be adjusted, thereby adjusting the air volume of the air outlet 4, adjusting the local cooling rate of the film, and ultimately adjusting the local thickness of the film. In addition, this embodiment uses the threaded push rod 210 to push the baffle block 220, which means that technicians can rotate the threaded push rod 210 according to the actual film thickness to fine-tune the baffle block 220. Compared with the manual fine-tuning by linear automated equipment such as motors, the adjustment accuracy of this embodiment is higher.

[0016] In this embodiment, as Figure 3 As shown, the threaded push rod 210 is a hexagon socket head cap screw, with the cylindrical head located above the first inner core 110. Rotating the cylindrical head pushes the windshield block 220 to move up and down. The elastic element 230 is a compression spring, and two springs are provided, symmetrically arranged on both sides of the threaded push rod 210.

[0017] In another embodiment, such as Figure 5 As shown, a cooling air ring for a blown film equipment is proposed, the cooling air ring comprising: The air duct adjustment structure described in the above embodiments; The air ring housing 300 has the aforementioned air duct adjustment structure installed inside; The top cover 400 of the air ring is installed on the outer shell 300 of the air ring to form a radial air duct and a circumferential air duct.

[0018] This embodiment uses the air duct adjustment structure described in the above embodiments, and its specific features and effects will not be elaborated here.

[0019] Furthermore, this embodiment can also employ an optional implementation method, such as... Figure 6 and Figure 7 As shown, the cooling air ring of the blown film equipment also includes a split air duct assembly 500, which is disposed inside the air ring housing 300; The diversion duct assembly 500 includes a plurality of diversion plates 510. The plurality of diversion plates 510 are inclined and arranged in a ring array on the inner circumference of the air ring shell 300, dividing the circumferential air duct into a first circumferential air duct 2 and a second circumferential air duct 3. A ventilation opening is provided between two adjacent diversion plates 510. An air inlet 1 is provided on the outer side of the air ring housing, and an air outlet 4 is provided at the center of the inner core 100 of the air ring. On the radial air duct, the airflow passes sequentially through the air inlet 1, the first circumferential air duct 2, the second circumferential air duct 3, the air duct adjustment component 200, and the air outlet 4.

[0020] In this optional implementation, such as Figure 6 and Figure 7 As shown, the flow dividers 510 are inclined and distributed in a ring. Airflow enters the main body of the air ring from the air inlet 1 and diffuses in both clockwise and counterclockwise directions due to the obstruction of the flow dividers 510. In the counterclockwise direction, the airflow flows counterclockwise along the first circumferential air duct 2; in the clockwise direction, the airflow enters the second circumferential air duct 3 through the ventilation opening between two adjacent flow dividers 510, flowing clockwise. When the airflow enters the second circumferential air duct 3 from the first circumferential air duct 2, the uniformity of the airflow flow in the entire second circumferential air duct 3 is improved. Previous air rings did not have the flow divider group 500 of this embodiment. The airflow velocity was higher on the side closer to the air inlet 1 and lower on the side farther from the air inlet 1, resulting in uneven film thickness. Therefore, the flow divider group 500 of this embodiment aims to improve the quality of blown film forming.

[0021] In this optional embodiment, the direction in which the shunt plate 510 is set can be either... Figure 6 The clockwise tilt shown can also be counterclockwise; this embodiment only uses clockwise as an example. The vents between adjacent diverter plates 510 must not face the radial direction of the air ring body. The air entering the first circumferential air duct 2 must be blocked and guided by the diverter plates 510 before entering the second circumferential air duct 3. In this embodiment, to improve the guiding effect, the diverter plate 510 is an arc-shaped plate, curved towards the center of the air ring body.

[0022] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0023] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air duct adjusting structure characterized by comprising: The air duct adjustment structure includes: The inner core of the air ring includes a first inner core and a second inner core. The first inner core is fitted on top of the second inner core, and a radial air channel is left between the two. An annular groove is provided at the bottom of the first inner core in the direction perpendicular to the radial air channel. Several air duct adjustment components are arranged in a ring array within the annular groove. Each air duct adjustment component includes a threaded push rod, a wind deflector block, and an elastic element. The threaded push rod passes through the first inner core, extends into the annular groove, and is rotatably connected to the first inner core. The end of the threaded push rod is threadedly connected to the wind deflector block. The elastic element is disposed within the annular groove, with its two ends respectively connected to the wind deflector block and the annular groove. The wind deflector block is slidably connected to the annular groove in the axial direction.

2. The air duct adjusting structure according to claim 1, wherein The threaded push rod is an internal hexagonal head screw, with the cylindrical head located above the first inner core. By rotating the cylindrical head, the wind deflector block is pushed up and down.

3. The air duct adjustment structure according to claim 1, characterized in that, The elastic element is a compression spring, and two springs are provided, symmetrically arranged on both sides of the threaded push rod.

4. A cooling air ring for a blown film equipment, characterized in that, The cooling air ring of the blown film equipment includes: The air duct adjustment structure according to any one of claims 1-3; The air ring housing has the aforementioned air duct adjustment structure installed inside; The top cover of the air ring is installed on the outer shell of the air ring, forming a radial air duct and a circumferential air duct.

5. The cooling air ring of the blown film equipment according to claim 4, characterized in that, The blowing film equipment cooling air ring also includes a split air duct assembly, which is disposed inside the air ring housing; The diversion duct assembly includes several diversion plates, which are inclined and arranged in a ring array on the inner circumference of the air ring shell, dividing the circumferential air duct into a first circumferential air duct and a second circumferential air duct. Ventilation openings are provided between two adjacent diversion plates. An air inlet is provided on the outer side of the air ring housing, and an air outlet is provided at the center of the inner core of the air ring; on the radial air duct, the airflow passes sequentially through the air inlet, the first circumferential air duct, the second circumferential air duct, the air duct adjustment component, and the air outlet.

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