Double-layer air ring of film blowing machine

Abstract

The utility model relates to the technical field of film blowing machines, in particular to a double-layer air ring of a film blowing machine, which comprises an air uniformizing piece, a base plate, a first ring body and a second ring body, a plurality of air inlets are uniformly distributed on the peripheral wall of the air uniformizing piece, an inner pressure air ring is arranged on the inner edge of the base plate, and a first pressure air ring extends upwards from the inner wall of the first ring body. A first air outlet is formed between the first air pressing ring and the inner air pressing ring, the inner wall of the second ring body extends upwards to form a second air pressing ring, the second air pressing ring and the first air pressing ring form a second air outlet, an upper air blocking ring and a lower air blocking ring are arranged on the inner wall of the air uniformizing piece, and the upper air blocking ring is in external threaded connection with an inner air ring. The upper air blocking ring and the second ring body are arranged on the two sides of the annular connecting wall respectively, a plurality of first air outlet holes distributed along the circumference are formed in the annular connecting wall, and a direction wheel assembly is arranged on the upper end face of the annular connecting wall.

Description

Technical Field

[0001] The utility model relates to the technical field of film blowing machines, in particular to a double-layer air ring of a film blowing machine. Background Art

[0002] The air ring is an important component of the film blowing machine. The function of the air ring is to cool the film bubble that is extruded from the die head and blown into shape. The cooling airflow of the air ring is a 360-degree annular airflow, and blows toward the film bubble to cool the film bubble. The utility model patent with patent number CN217597804U discloses a double-air-inlet air ring of a film blowing machine, including a chassis, which is annular and has an internal pressure air ring, an air shield ring and a mounting ring from the inside to the outside; a uniform air member, which includes an upper air ring body, which is provided with an upper uniform air ring and an upper air shield ring, and the upper uniform air ring is provided with uniform air holes, a lower air ring body, which is provided with a lower air shield ring, and ventilation gaps are provided between the upper air shield ring and the lower air ring body and between the lower air shield ring and the upper air ring body, the inner wall of the lower air ring body is connected to the outer edge of the chassis, and a middle air ring body. , which is provided with an air inlet, the upper and lower ends of the middle wind ring body are respectively connected to the outer edges of the upper wind ring body and the lower wind ring body; the first ring body is provided with a first air duct groove corresponding to the wind shield ring, the outer edge of the first ring body is connected to the mounting ring of the chassis, a first gap is provided between the first ring body and the chassis, and an air inlet hole is opened on the first ring body, the air inlet hole is connected to the first gap, the inner wall of the first ring body extends upward to form a first pressure air ring, the bottom of the first pressure air ring is lower than the inner pressure air ring, and a first air outlet is formed between the first pressure air ring and the inner pressure air ring;

[0003] and a second ring body, an outer edge of which is connected to the upper wind ring body, a second gap is provided between the second ring body and the first ring body, and a second pressure air ring is extended upward from the inner wall of the second ring body, and the second pressure air ring and the first pressure air ring form a second air outlet, the lower wind shield ring is provided with two groups, namely the first wind shield ring and the second wind shield ring, and a lower wind uniforming ring is provided between the two, and the lower wind uniforming ring is also provided with a wind uniforming hole, the wind uniforming part is provided with an upper wind uniforming ring, a first wind shield ring, a lower wind uniforming ring, a second wind shield ring and an upper wind shield ring from the outside to the inside, the upper wind uniforming ring is connected to the lower wind ring body, and a ring-shaped air inlet channel is formed between the upper wind uniforming ring and the upper wind ring body, the lower wind ring body and the middle wind ring body, the first pressure air ring is inclined to the outer circumference, the first ring body is threadedly connected to the mounting ring of the chassis, and the second ring body is threadedly connected to the upper wind ring body.

[0004] The above-mentioned double air outlet air ring has the following disadvantages: 1. The first ring body is threadedly connected to the mounting ring of the chassis, and the height of the first ring body relative to the chassis is adjusted by the threaded connection, thereby adjusting the air volume of the first air outlet and the second air outlet. The first ring body needs to be rotated for adjustment. However, the first ring body is located in the inner ring of the double air outlet air ring, and there is no structure on it that is convenient for operation, which increases the difficulty of adjustment; 2. The second ring body is threadedly connected to the upper wind ring body, and the air volume of the second air outlet is adjusted by adjusting the height of the second ring body relative to the upper wind ring body. However, there is no structure on the second ring body that is convenient for operation, which increases the difficulty of adjustment. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a double-layer air ring of a film blowing machine to facilitate the adjustment of air volume in view of the deficiencies of the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-layer air ring of a film blowing machine, comprising an air uniformity member, a chassis, a first ring body, and a second ring body, the chassis and the air uniformity member are both annular, a plurality of air inlets are evenly distributed on the outer peripheral wall of the air uniformity member, the outer edge of the chassis is connected to the inner edge of the air uniformity member, the first ring body and the second ring body are both located inside the air uniformity member, an inner edge of the chassis is provided with an inner pressure air ring, a first pressure air ring is extended upward from the inner wall of the first ring body, a first air outlet is formed between the first pressure air ring and the inner pressure air ring, and a second pressure air ring is extended upward from the inner wall of the second ring body The second compressed air ring and the first compressed air ring form a second air outlet, and a ventilation gap is provided on the inner wall of the wind uniforming member, which is characterized in that: the ventilation gap divides the inner wall of the wind uniforming member into an upper wind shield ring and a lower wind shield ring, and the upper wind shield ring is externally threadedly connected to an inner wind ring, and the inner wind ring includes an annular connecting wall threadedly connected to the outer wall of the second ring body and an annular connecting bottom connected to the outer wall of the first ring body, the upper wind shield ring and the second ring body are arranged on both sides of the annular connecting wall, and the annular connecting wall is provided with a plurality of first air outlet holes distributed along the circumference, and the upper end face of the annular connecting wall is provided with a direction wheel assembly.

[0007] The utility model with the above-mentioned characteristics: by arranging an inner wind ring and arranging a direction wheel assembly on the inner wind ring, the inner wind ring can be driven to rotate circumferentially around the center of the circle by rotating the direction wheel assembly. Since the inner wind ring is connected to the first ring body, rotating the direction wheel assembly can simultaneously drive the first ring body to rotate. Since the inner wind ring and the upper wind shield ring are threadedly connected, when the direction wheel assembly is rotated clockwise or counterclockwise, the position of the inner wind ring on the upper wind shield ring can be changed, thereby changing the size of the first air outlet and the size of the wind pressure, and the operation is convenient; the first air outlet is formed between the first pressure air ring and the inner pressure air ring, and the air outlet is uniform.

[0008] A further configuration of the present invention is that at least one handle is provided on the upper end surface of the outer wall of the second annular body.

[0009] The utility model with the above-mentioned characteristics: by arranging a handle on the second ring body, the second ring body can be driven to rotate circumferentially around the center of the circle by rotating the handle. Since the second ring body is threadedly connected to the inner wind ring, when the handle is rotated clockwise or counterclockwise, the height of the second ring body on the inner wind ring can be changed, thereby changing the size of the second air outlet to adjust the wind pressure, and the operation is convenient and quick; the second compressed air ring and the first compressed air ring form a second air outlet, and the air outlet is uniform.

[0010] The utility model is further configured as follows: the wind uniforming member includes an outer shell, an air uniforming ring, and an inner chassis, all of which are annular; the air uniforming ring includes an air uniforming ring body, an upper wind shield ring connected to the inner wind circle, the air uniforming ring body is provided with a plurality of fourth air outlet holes distributed along the circumference, the upper wind shield ring is located on the side of the air uniforming ring body close to the second ring body, and an annular curved surface is connected before the upper ends of the two, the annular curved surface extends toward the side of the air uniforming ring body away from the second ring body until it cooperates with the inner edge of the outer shell, the end face of the outer shell is provided with a first annular groove for placing the outer edge of the annular curved surface, the lower end of the air uniforming ring body is fixedly connected to the inner chassis, the end face of the inner chassis is provided with a second annular groove for placing the outer edge of the outer shell, and the lower wind shield ring is located at the inner edge of the inner chassis.

[0011] The utility model has the above-mentioned features: since there is no positioning structure between the uniform air ring and the outer shell, the uniform air ring can rotate around the axis. Since all the components except the outer shell in the double-layer air ring can be linked, all the components except the outer shell rotate with the mold. A power part that drives the mold to rotate is provided in the film blowing machine. If the uniform air ring is fixedly connected to the outer shell, a rotating wind disk is required to connect the power part and the outer shell so that the air ring can rotate. The above structure does not require an additional rotating wind disk, thereby reducing production costs; by rotating the uniform air ring, the thickness of the film can be made more uniform during the processing, and the obtained film is smoother, more beautiful, and easy to roll up; a fourth air outlet is opened on the uniform air ring body for circulation, which reduces the air outlet area, thereby increasing the wind pressure, and thus effectively improving production efficiency; the uniform air part is divided into a detachable outer shell, a uniform air ring and an inner chassis, which is convenient for later cleaning.

[0012] A further arrangement of the present invention is: the fourth air outlet is located at the lower part of the air uniforming ring body, a connecting ring is provided at the outer edge of the inner chassis, the second annular groove is located in the connecting ring, and the inner wall of the connecting ring facing the lower wind shield ring is an inclined wall inclined toward the lower wind shield ring.

[0013] The utility model with the above characteristics: the fourth air outlet is set at the lower part of the wind uniforming ring body, so that the wind can only pass through the inclined wall and the lower part of the wind uniforming ring body, increasing the wind pressure, and the inner wall of the connecting ring is set to an inclined shape, which has a guiding effect on the wind.

[0014] A further arrangement of the present invention is that the outer shell includes an annular shell, an annular ventilation cavity communicated with the outside is provided in the annular shell, a plurality of air inlet shells evenly distributed along the circumference are provided on the outer periphery of the annular shell, the air inlet shells surround the outside of the annular shell to form a turbine shape, and the two are connected, and an air inlet nozzle is provided on one side where the air inlet shell is connected to the annular shell, and an inwardly concave arc surface is provided on the other side.

[0015] The utility model with the above characteristics: the air inlet shell is arranged in a turbine shape outside the annular shell. After ventilation, the wind touches the curved surface in the air inlet shell and rebounds and moves toward the wind nozzle, thereby forming a vortex in the annular ventilation cavity and increasing the wind pressure.

[0016] A further arrangement of the present invention is that an upper air ring is threadedly connected to a side wall of the second compressed air ring close to the inner air ring, and the upper air ring is provided with a plurality of second air outlet holes along the circumferential direction, and an adjusting air ring is provided on the outer periphery of the upper air ring, and the adjusting air ring is provided with a plurality of third air outlet holes along the circumferential direction, and the adjusting air ring is rotated to change the overlap between the second air outlet holes and the third air outlet holes.

[0017] The utility model with the above-mentioned characteristics: by setting an upper wind ring, the film bubble passes through the upper wind ring, and there is a gap between the upper wind ring and the film bubble, which allows cold air to pass through, thereby improving the cooling effect; a number of second air outlet holes are set on the upper wind ring for pressure relief. After the cold air passes through the upper wind ring, part of the wind is discharged upward along the discharge direction of the film bubble, and the other part is discharged from the second air outlet holes, thereby reducing the exhaust volume in the vertical direction and avoiding excessive stretching of the film bubble due to excessive air volume; an adjusting wind ring is set outside the upper wind ring, and the size of the second air outlet can be adjusted by rotating the adjusting wind ring to adjust the wind temperature, thereby controlling the amount of water droplets produced by special materials.

[0018] A further configuration of the present invention is that the bottom of the first pressure air ring is higher than the inner pressure air ring, and the inner pressure air ring is located inside the first pressure air ring.

[0019] The utility model with the above characteristics: the first pressure air ring is higher than the internal pressure air ring, which increases the air output of the first air outlet, thereby improving production efficiency.

[0020] A further configuration of the present invention is that the steering wheel assembly includes a steering wheel and at least two fixing plates, one end of the fixing plate is fixedly connected to the steering wheel, and the other end is detachably connected to the upper end surface of the annular connecting wall via a fastener.

[0021] The utility model with the above-mentioned characteristics: the steering wheel assembly is detachably connected to the inner wind ring, which is convenient for assembly and production; since the inner wind ring is connected to the second ring body and the first ring body at the same time, the force required to rotate the inner wind ring is relatively large, and the use of a steering wheel is beneficial for the operator to better apply steering force.

[0022] A further configuration of the present invention is that: a windshield buffer rib is provided on the outer edge of the chassis, a buffer ring groove is formed between the windshield buffer rib and the lower windshield ring, and the height of the windshield buffer rib is lower than that of the first ring body.

[0023] The utility model with the above features: by providing a buffer ring groove, it prevents wind from blowing directly from the ventilation gap to the first air outlet, and has a buffering effect on the wind.

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0026] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0027] Figure 3 It is a bottom view of an embodiment of the present utility model.

[0028] Figure 4 for Figure 3 Cross-sectional view of AA in the figure.

[0029] Figure 5 This is a schematic structural diagram of the housing of an embodiment of the present utility model.

[0030] Figure 6 This is a schematic structural diagram of the wind uniforming ring according to an embodiment of the present utility model.

[0031] Figure 7 This is a schematic structural diagram of the inner air ring in an embodiment of the present utility model.

[0032] Figure 8 This is a schematic structural diagram of the first ring body of an embodiment of the present utility model.

[0033] Figure 9 This is a schematic structural diagram of the second ring body of an embodiment of the present utility model.

[0034] Figure 10 This is an exploded view of the air uniforming member according to an embodiment of the present invention.

[0035] Figure 11 for Figure 10 Cross-sectional view of the BB. DETAILED DESCRIPTION

[0036] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0037] like Figure 1-11The double-layer wind ring of a film blowing machine shown in the figure includes a wind uniformity member 1, a chassis 2, a first ring body 3, a second ring body 4, and an inner wind ring 5. The chassis 2 and the wind uniformity member 1 are both annular, and the first ring body 3 and the second ring body 4 are both located in the wind uniformity member 1. The wind uniformity member 1 includes an outer shell 11, an wind uniformity ring 12, and an inner chassis 13. All three are annular. The outer shell 11 includes an annular shell 112. An annular ventilation cavity 111 that is communicated with the outside is provided in the annular shell 112. The outer periphery of the annular shell 11 is provided with a plurality of air inlet shells 113 evenly distributed along the circumference. The air inlet shells 113 surround the outside of the annular shell 112 to form a turbine shape, and the two are connected. A wind nozzle 15 is provided on one side where the air inlet shell 113 is connected to the annular shell 112, and an inwardly concave arc surface 1131 is provided on the other side. The uniform wind ring 12 includes a uniform wind ring body 121 and an upper wind shield ring 122 connected to the inner wind ring 5. The upper wind shield ring 122 is located on the side of the uniform wind ring body 121 close to the second ring body 4. An annular curved surface 123 is connected to the upper ends of the two. The annular curved surface 123 extends toward the side of the uniform wind ring body 121 away from the second ring body 4 until it is connected to the inner edge of the outer shell 11. The end surface of the outer shell 11 is provided with a first annular groove 114 for placing the outer edge of the annular curved surface 123. A sealing ring 10 is embedded between the first annular groove 114 and the annular curved surface. The lower end of the uniform wind ring body 121 is connected to the inner chassis 13, and a detachable connection is achieved by fasteners. The end surface of the inner chassis 13 is provided with a second annular groove 132 for placing the outer edge of the outer shell 11. A sealing ring 10 is embedded between the annular grooves 132, a connecting ring 133 is provided on the outer edge of the inner chassis 13, the second annular groove 132 is located in the connecting ring 133, a lower wind shield ring 131 is provided at the inner edge of the inner chassis 13, and a plurality of fourth air outlet holes 124 distributed along the circumference are provided on the uniform wind ring body 121, and the fourth air outlet holes 124 are located at the lower part of the uniform wind ring body 121. The inner wall of the connecting ring 133 facing the lower wind shield ring 131 is an inclined wall 1331 inclined toward the lower wind shield ring 131, and a ventilation gap is left between the upper wind shield ring 122 and the lower wind shield ring 131. The inner wind circle 5 includes an annular connecting wall 51 threadedly connected to the second ring body 4 and the upper wind shield ring 122, and an annular connecting bottom 52 connected to the outer wall of the first ring body 3. The connecting wall 51 is provided with a plurality of first air outlet holes 53 distributed along the circumference, the inner edge of the chassis 2 is provided with an inner pressure air ring 21, the first ring body 3 includes a disc-shaped first body 32, the inner wall of the first body 32 is provided with a first pressure air ring 31, and a first air outlet is formed between the first pressure air ring 31 and the inner pressure air ring 21. The outer peripheral wall of the first body 32 is provided with a first ring edge 33 and a second ring edge 34 from the inside to the outside, and a step is formed between the first ring edge 33 and the first body 32 for installing the inner edge of the annular connecting bottom 52. The annular groove 311 and the annular connecting bottom 52 are detachably connected by fasteners. The second ring edge 34 is located below the inner wind circle 5, and a second air guide cavity connected to the second air outlet is formed between the inner wind circle 5, the first ring body 3 and the second ring body.The second ring body 4 includes a second outer ring wall 42, a second inner ring wall 43 and a second annular surface 44 located therebetween. The inner wall of the second inner ring wall 43 extends upward with a second compressed air ring 41, and a second air outlet is formed between the second compressed air ring 41 and the first compressed air ring 31. The second outer ring wall 42 is threadedly connected to the inner air ring. The first compressed air ring 31 and the second compressed air ring 41 are trumpet-shaped, and the openings expand successively along the direction of the film bubble. They have a guiding effect on the wind direction and improve the cooling effect. The bottom of the first compressed air ring 31 is higher than the inner compressed air ring 21, and the inner compressed air ring 21 is located on the inner side of the first compressed air ring 31. A windshield buffer rib 22 is provided on the outer edge of the chassis 2, and a buffer ring groove 23 is formed between the windshield buffer rib 22 and the lower windshield ring 131. The height of the windshield buffer rib 22 is lower than the first ring body 3. A first air guide cavity connected to the first air outlet is formed between the chassis 2, the windshield buffer rib 22, and the first body 32. The upper end surface of the annular connecting wall 51 of the inner air ring 5 is provided with a direction wheel assembly 6, which includes a direction wheel 61 and at least two fixing plates 62. One end of the fixing plate 62 is fixedly connected to the direction wheel 61, and the other end is detachably connected to the upper end surface of the annular connecting wall 51 by fasteners. The upper end surface of the outer wall of the second ring body 4 is provided with at least one handle 7. In this embodiment, several handles 7 are provided along the circumference to facilitate actual operation. An upper air ring 8 is threadedly connected to a side wall of the second compressed air ring 41 close to the inner air ring 5. The upper air ring 8 is provided with a plurality of second air outlet holes 81 along the circumferential direction. An adjustment air ring 9 is sleeved on the outer circumference of the upper air ring 8. A limiting step 82 is provided on the outer circumferential wall of the upper air ring 8 to prevent the adjustment air ring 9 from slipping. The adjustment air ring 9 is provided with a plurality of third air outlet holes 91 along the circumferential direction. Rotating the adjustment air ring 9 changes the overlap between the second air outlet holes 81 and the third air outlet holes 91.

[0038] In the actual production process, the inner wind circle can be driven to rotate by turning the direction wheel. Since the inner wind circle is threadedly connected to the upper wind shield ring, rotating the direction wheel counterclockwise or clockwise will change the height position of the inner wind circle on the upper wind shield ring. Since the inner wind circle is connected to the first ring body, rotating the direction wheel can change the height position of the first ring body relative to the chassis, thereby changing the size of the first air outlet. In addition, since the second ring body and the upper wind shield ring are simultaneously threadedly connected to the annular connecting wall of the inner wind circle, and the upper wind circle is threadedly connected to the second ring body, when the direction wheel is turned, the inner wind circle, the first ring body, the second ring body, the upper wind circle, and the adjustment wind circle rotate at the same time. It is necessary to adopt a direction wheel that is convenient for applying rotational force, so that it can rotate under load better; when the second ring body is rotated by the handle, since the second ring body is threadedly connected to the inner wind circle, rotating the handle clockwise or counterclockwise will change the height position of the second ring body on the inner wind circle, thereby changing the size of the second air outlet. Since the second ring body is connected to the upper wind circle, when the handle is turned, the upper wind circle will be driven to rotate at the same time; by rotating the adjusting wind circle, the overlap between the second air outlet and the third air outlet can be changed, thereby changing the size of the second air outlet; this air ring is suitable for blow molding of high and low pressure source materials and degradable source materials of film blowing machines, and the output is increased by more than 20% compared with the same level.

Claims

1. A double-layer air ring of a film blowing machine, comprising an air uniformity member, a chassis, a first ring body, and a second ring body, the chassis and the air uniformity member are both annular, a plurality of air inlets are evenly distributed on the outer peripheral wall of the air uniformity member, the outer edge of the chassis is connected to the inner edge of the air uniformity member, the first ring body and the second ring body are both located in the air uniformity member, an inner edge of the chassis is provided with an inner pressure air ring, a first pressure air ring extends upward from the inner wall of the first ring body, a first air outlet is formed between the first pressure air ring and the inner pressure air ring, a second pressure air ring extends upward from the inner wall of the second ring body, the second pressure air ring and the first pressure air ring form a second air outlet, a ventilation gap is provided on the inner wall of the air uniformity member, and it is characterized in that: The ventilation gap divides the inner wall of the wind uniforming member into an upper wind shield ring and a lower wind shield ring. The upper wind shield ring is externally threadedly connected to an inner wind ring. The inner wind ring includes an annular connecting wall threadedly connected to the outer wall of the second ring body and an annular connecting bottom connected to the outer wall of the first ring body. The upper wind shield ring and the second ring body are arranged on both sides of the annular connecting wall. The annular connecting wall is provided with a plurality of first air outlet holes distributed along the circumference, and the upper end face of the annular connecting wall is provided with a direction wheel assembly.

2. The double-layer air ring of a film blowing machine according to claim 1, characterized in that: At least one handle is disposed on the upper end surface of the outer wall of the second annular body.

3. The double-layer air ring of a film blowing machine according to claim 1, characterized in that: The wind uniforming member includes an outer shell, an air uniforming ring, and an inner chassis, all of which are ring-shaped. The air uniforming ring includes an air uniforming ring body and an upper wind shield ring connected to the inner wind circle. The air uniforming ring body is provided with a plurality of fourth air outlet holes distributed along the circumference. The upper wind shield ring is located on the side of the air uniforming ring body close to the second ring body, and an annular curved surface is connected before the upper ends of the two. The annular curved surface extends toward the side of the air uniforming ring body away from the second ring body until it cooperates with the inner edge of the outer shell. The end surface of the outer shell is provided with a first annular groove for placing the outer edge of the annular curved surface. The lower end of the air uniforming ring body is fixedly connected to the inner chassis, and the end surface of the inner chassis is provided with a second annular groove for placing the outer edge of the outer shell. The lower wind shield ring is located at the inner edge of the inner chassis.

4. The double-layer air ring of a film blowing machine according to claim 3, characterized in that: The fourth air outlet is located at the lower part of the wind uniforming ring body, a connecting ring is provided at the outer edge of the inner chassis, the second annular groove is located in the connecting ring, and the inner wall of the connecting ring facing the lower wind shielding ring is an inclined wall inclined toward the lower wind shielding ring.

5. The double-layer air ring of a film blowing machine according to claim 3, characterized in that: The shell includes an annular shell and several air inlet shells evenly distributed on the outer circumference of the annular shell. The annular shell is provided with an annular ventilation cavity connected to the outside. The air inlet shell surrounds the outside of the annular shell to form a turbine shape. The two are connected. One side of the air inlet shell connected to the annular shell is provided with an air inlet nozzle, and the other side is an inwardly concave arc surface.

6. A double-layer air ring for a film blowing machine according to claim 1 or 2, characterized in that: An upper wind ring is threadedly connected to a side wall of the second compressed air ring close to the inner wind ring, and the upper wind ring is provided with a plurality of second air outlet holes along the circumferential direction. An adjusting wind ring is sleeved on the outer circumference of the upper wind ring, and the adjusting wind ring is provided with a plurality of third air outlet holes along the circumferential direction. The adjusting wind ring is rotated to change the overlap between the second air outlet holes and the third air outlet holes.

7. The double-layer air ring of a film blowing machine according to claim 1, characterized in that: The bottom of the first air pressure ring is higher than the inner air pressure ring, and the inner air pressure ring is located inside the first air pressure ring.

8. The double-layer air ring of a film blowing machine according to claim 1, characterized in that: The direction wheel assembly comprises a direction wheel and at least two fixing plates, one end of the fixing plate is fixedly connected to the direction wheel, and the other end of the fixing plate is detachably connected to the upper end surface of the annular connecting wall via a fastener.

9. A double-layer air ring for a film blowing machine according to claim 1 or 3, characterized in that: The outer edge of the chassis is provided with a wind-shielding buffer rib, a buffer ring groove is formed between the wind-shielding buffer rib and the lower wind-shielding ring, and the height of the wind-shielding buffer rib is lower than the first ring body.

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