Cold air ring for producing a roll film

Abstract

The application discloses a cold air ring for roll film production and belongs to the technical field of roll film production. The cold air ring comprises a base and a connecting port for guiding air flow. The base is provided with an outer air ring and an inner air ring. The outer air ring and the inner air ring are both provided with air outlets for guiding cold air to film bubbles. The lower part of the inner air ring is connected with a fan. The cold air ring can guide air flow out of the outer air ring and the inner air ring at the same time, so that the air pressure inside and outside the film bubble is balanced, the formation of the film bubble is ensured, and when the air flow is guided into the air guiding cavity through the connecting port, the air flow fills the buffer cavity first. When the air pressure is greater than the elastic supporting force of the elastic element, the blocking piece is pushed to move downward, the air flow is guided into the air guiding and discharging cavity, and then is blown out through the air outlet. At this time, the air flow starts from top to bottom at the same time, avoiding the existing air flow directly blowing out through the air outlet of the outer air ring close to the connecting port, so that the air flow discharging wind power is different.

Description

Technical Field

[0001] This invention discloses a cold air ring for roll film production, which belongs to the field of roll film production technology. Background Technology

[0002] In extrusion blown film production, the traditional outer air ring uses a direct blowing method. Since the outer air ring is open to the atmosphere, it cannot form a stable pressure. Therefore, the uniformity of the air ring and the changes in pressure will directly affect the film bubble, causing the film bubble to vibrate, deform, break, and have poor cooling uniformity, resulting in a variety of undesirable phenomena such as large thickness deviation and poor appearance of the product. Summary of the Invention

[0003] The purpose of this invention is to provide a cooling air ring for roll film production in order to solve the above-mentioned problems.

[0004] The present invention achieves the above-mentioned objective through the following technical solution: a cold air ring for roll film production, comprising a base and a connection port for introducing airflow, wherein an outer air ring and an inner air ring are provided on the base, and both the outer air ring and the inner air ring are provided with air outlets for guiding cold air to the film bubble, the lower part of the inner air ring is connected to a fan, and an annular die head for film bubble extrusion is provided between the outer air ring and the inner air ring, wherein an air guide cavity is provided inside the base and is connected to the outer air ring, and a partition component is provided inside the air guide cavity to divide the air guide cavity into a buffer cavity and an outlet cavity, wherein a blocking member for controlling the connection between the buffer cavity and the outlet cavity is slidably provided on the partition component, and an elastic element for pushing the blocking member to close the connection between the buffer cavity and the outlet cavity is also provided on the partition component.

[0005] By adopting the above technical solution, the outer and inner air rings are activated to simultaneously exhaust airflow, thereby balancing the air pressure inside and outside the membrane bubble and ensuring the formation of the membrane bubble. When the airflow is introduced into the air guide cavity through the connection port, the airflow will first fill the buffer cavity. Then, when the air pressure is greater than the elastic support force of the elastic element, it will push the blocking component to move downward, and the airflow will be introduced into the exhaust cavity and then blown out through the air outlet. At this time, the airflow from all places will start simultaneously from top to bottom, avoiding the existing airflow from being blown out directly through the air outlet of the outer air ring near the connection port, which would cause differences in the strength of the exhaust airflow.

[0006] Preferably, the outer air ring is slidably disposed on the base, and the base is provided with a driving mechanism that drives the outer air ring to reciprocate by means of the heat of the membrane bubble. An abutment block is provided at the connection between the outer air ring and the driving mechanism, and a toggle member is fixedly disposed on the blocking member for providing initial power to the driving mechanism to rotate the outer air ring.

[0007] By adopting the above technical solution, when the air pressure is greater than the elastic support force of the elastic element, the membrane bubble is extruded through the die orifice of the annular die head. At the same time, the high temperature heat of the membrane bubble is used as the driving force to make the pushing mechanism rotate the outer air ring. This avoids the membrane bubble not getting good heat dissipation and airflow support due to the fixed position of the air outlet on the outer air ring. In addition, while the blocking component moves, the outer air ring is rotated by the pushing component, which also provides initial power for the pushing mechanism and ensures the transmission stability of the pushing mechanism.

[0008] Preferably, the pushing mechanism includes a sealed cylinder and a piston that is slidably disposed inside the sealed cylinder. The sealed cylinder is provided with a heat insulation component that divides the sealed cylinder into a heating zone and a heat dissipation zone. The heating zone is in contact with the die opening of the annular die head, and the heating zone and the heat dissipation zone are interconnected. A transmission mechanism for mutual transmission is provided between the heat insulation component and the piston, and the transmission mechanism abuts against the outer air ring.

[0009] By adopting the above technical solution, when the annular die head conducts heat from the membrane bubble to the interior of the heating zone, the gas inside the heating zone expands due to heat, which in turn pushes the piston closer to the outer air ring. The piston then pushes the heat insulation component closer to the heating zone through the transmission mechanism, thereby guiding all the gas inside the heating zone to the heat dissipation zone. This allows the gas to better push the piston outward, while the heat insulation component isolates the heat transfer from the membrane bubble, accelerating the cooling speed of the gas in the heat dissipation zone. As the gas temperature decreases, the gas pressure decreases, causing the piston to move closer to the outer air ring. At the same time, the transmission mechanism drives the heat insulation component to move towards the heating zone, squeezing the gas in the heating zone towards the heating zone, thereby accelerating the heating speed of the gas. This achieves a reciprocating alternating effect, allowing the transmission mechanism to continuously drive.

[0010] Preferably, the transmission mechanism includes connecting rods, a crankshaft rotatably mounted on a base, and a pushing assembly for reciprocatingly pushing the abutment block. There are two connecting rods, and the two connecting rods are respectively connected to the piston and the heat insulation component. At the same time, the other end of each connecting rod is connected to the crankshaft. The position where the crankshaft connects to the connecting rod on the heat insulation component forms a 90-degree angle with the position where the crankshaft connects to the connecting rod on the piston component in the clockwise rotation direction. The crankshaft is connected to the pushing assembly.

[0011] By adopting the above technical solution, when the crankshaft rotates, the piston and heat insulation components move simultaneously through two connecting rods. Furthermore, by utilizing a 90-degree angle, the movements of the piston and heat insulation components differ by one-quarter, ensuring mutual transmission between the piston and heat insulation components.

[0012] Preferably, the pushing assembly includes a turntable fixedly mounted on the crankshaft, a hinge rod for pushing the abutment block to move, and a rotating component with two ends rotatably connected to the turntable and the hinge rod, respectively.

[0013] By adopting the above technical solution, when the crankshaft rotates, it drives the turntable to rotate. The turntable pushes the hinge rod to make linear reciprocating motion through the rotating parts, thereby achieving the reciprocating pushing effect of the hinge rod on the abutment block.

[0014] Preferably, a fixing member is fixedly provided on the base, and an elastic member for pushing the abutment block to reset its position is provided between the fixing member and the abutment block.

[0015] By adopting the above technical solution, when the hinge rod moves away from the abutment block, the elastic element pushes the abutment block to reset its position to ensure the abutment between the hinge rod and the abutment block, thereby ensuring the stability of subsequent transmission.

[0016] Preferably, the outer wind ring is provided with a connector at the position of the actuating component. The connector has a groove for the actuating component to be inserted into it, and the direction in which the actuating component is inserted into the groove is perpendicular to the direction through which the groove passes. Two guides are provided inside the groove. The two guides are respectively provided on two parallel sidewalls of the groove, and there is a horizontal height difference between the two guides. The guides are conical structures.

[0017] By adopting the above technical solution, when the actuating component moves downward, it abuts against the guide component, thereby pushing the guide component to move, which in turn pushes the outer air ring to move. The outer air ring pushes the hinge rod to move through the abutting block, thereby achieving the effect of giving the pushing mechanism initial power.

[0018] Preferably, the outer air ring includes a first upper air inlet and a first lower air inlet, and the inner air ring includes a second upper air inlet and a second lower air inlet. The first upper air inlet and the second upper air inlet are respectively located on the side of the first lower air inlet and the second lower air inlet away from the annular mold head opening. The first upper air inlet, the first lower air inlet, the second upper air inlet, and the second lower air inlet are all conical structures. The larger opening end of the first upper air inlet and the second upper air inlet points towards the membrane bubble, and the smaller opening end of the first lower air inlet and the second lower air inlet points towards the membrane bubble.

[0019] By adopting the above technical solution, when the airflow first flows to the first upwind port and the second upwind port, the airflow velocity decreases because the aperture through which the airflow passes increases. When the airflow flows to the first downwind port and the second downwind port, the aperture through which the airflow passes decreases because the aperture through which the airflow passes increases. This makes the airflow velocity of the airflow guiding the membrane bubble at the first upwind port and the second upwind port the same as that at the first downwind port and the second downwind port, thereby ensuring that the force exerted by the gas on the formation of the membrane bubble is the same.

[0020] Preferably, the inner air ring is provided with an arc-shaped protrusion for dispersing the airflow.

[0021] By adopting the above technical solution, when the airflow blows towards the arc-shaped protrusion, the arc-shaped surface can be used to disperse the airflow, thereby ensuring that the airflow is uniformly discharged from the air ring.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The outer and inner air rings are activated simultaneously to exhaust airflow, balancing the air pressure inside and outside the membrane bubble and ensuring its formation. When the airflow is introduced into the air guide cavity through the connection port, it first fills the buffer cavity. Then, when the air pressure exceeds the elastic support force of the elastic element, it pushes the blocking component downward, allowing the airflow to enter the exhaust cavity and then be blown out through the air outlet. At this time, the airflow from all locations starts simultaneously from top to bottom, preventing existing airflow from being blown out directly through the air outlet of the outer air ring near the connection port, which would cause differences in the strength of the exhaust airflow. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the cooling air ring of the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of the cooling air ring structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0027] Figure 4 This is a schematic diagram of the connection structure between the driving mechanism and the outer air ring of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the actuating mechanism of the present invention;

[0029] Figure 6 This is a schematic diagram of the connector of the present invention.

[0030] Reference numerals: 1. Base; 2. Outer air ring; 21. First upper air inlet; 22. First lower air inlet; 23. Connector; 2301. Groove; 2302. Guide; 24. Abutment block; 25. Elastic element; 26. Fixing element; 3. Connection port; 4. Inner air ring; 41. Second upper air inlet; 42. Arc-shaped protrusion; 43. Second lower air inlet; 5. Annular mold head opening; 6. Pushing mechanism; 61. Sealed cylinder; 62. Heat insulation element; 63. Hinge rod; 64. Piston; 65. Connecting rod; 66. Crankshaft; 67. Turntable; 68. Rotating element; 7. Outlet cavity; 8. Buffer cavity; 9. Separating assembly; 91. Blocking element; 9101. Actuating element; 92. Elastic element. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. In this description, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "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 the present invention 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 the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-6As shown, a cold air ring for roll film production includes a base 1 and a connection port 3 for introducing airflow. An outer air ring 2 and an inner air ring 4 are provided on the base 1. Both the outer air ring 2 and the inner air ring 4 have air outlets for guiding cold air to the film bubble. The lower part of the inner air ring 4 is connected to a fan. A ring-shaped die 5 for film bubble extrusion is provided between the outer air ring 2 and the inner air ring 4. An air guide cavity is provided inside the base 1 and is connected to the outer air ring 2, thereby activating the outer air ring 2 and the inner air ring 4 to simultaneously guide airflow, balancing the air pressure inside and outside the film bubble and ensuring film bubble formation. Simultaneously, the air guide cavity is equipped with... A partition assembly 9 divides the air guide cavity into a buffer cavity 8 and an outlet cavity 7. A blocking element 91 is slidably mounted on the partition assembly 9 to control the connection between the buffer cavity 8 and the outlet cavity 7. The partition assembly 9 also has an elastic element 92 that pushes the blocking element 91 to close the connection between the buffer cavity 8 and the outlet cavity 7. When airflow enters the air guide cavity through the connection port 3, the airflow first fills the buffer cavity 8. Then, when the air pressure exceeds the elastic support force of the elastic element 92, it pushes the blocking element 91 downwards, and the airflow enters the outlet cavity 7, and then is blown out through the air outlet. At this time, the airflow from various locations will flow from top to bottom. Simultaneously, to prevent existing airflow from being directly blown out through the outlet of the outer air ring 2 near the connection port 3, thus avoiding differences in the strength of the outgoing airflow, the outer air ring 2 includes a first upper air outlet 21 and a first lower air outlet 22, and the inner air ring 4 includes a second upper air outlet 41 and a second lower air outlet 43. The first upper air outlet 21 and the second upper air outlet 41 are respectively located on the side of the first lower air outlet 22 and the second lower air outlet 43 away from the annular mold head opening 5. The first upper air outlet 21 and the first lower air outlet 22, as well as the second upper air outlet 41 and the second lower air outlet 43, are all conical structures. The larger openings of 41 all point towards the membrane bubble, while the smaller openings of the first downwind port 22 and the second downwind port 43 all point towards the membrane bubble. This ensures that when the airflow first flows towards the first upwind port 21 and the second upwind port 41, the airflow velocity decreases as the orifice through which the airflow passes increases. Conversely, when the airflow flows towards the first downwind port 22 and the second downwind port 43, the orifice through which the airflow passes decreases as the airflow velocity increases. This ensures that the airflow velocities of the first upwind port 21 and the second upwind port 41 are the same as those of the first downwind port 22 and the second downwind port 43 guiding the membrane bubble, thereby guaranteeing that the force exerted by the gas on the formation of the membrane bubble is the same.

[0033] Meanwhile, the outer air ring 2 is slidably mounted on the base 1, and the base 1 is equipped with a pushing mechanism 6 that uses the heat of the membrane bubble to drive the outer air ring 2 to reciprocate. A stop block 24 is provided at the connection between the outer air ring 2 and the pushing mechanism 6. A deflector 9101 is fixedly mounted on the blocking member 91 to provide initial power to the pushing mechanism 6 and to rotate the outer air ring 2. Thus, when the air pressure is greater than the elastic support force of the elastic element 92, the membrane bubble is extruded through the annular die head 5, and the high temperature heat of the membrane bubble is used as the driving force to make the pushing mechanism 6 to rotate the outer air ring 2. This avoids the membrane bubble not getting good heat dissipation and airflow support due to the fixed position of the air outlet on the outer air ring 2. In addition, the movement of the blocking member 91 and the rotation of the outer air ring 2 by the deflector 9101 also provide initial power to the pushing mechanism 6, ensuring the transmission stability of the pushing mechanism 6. The outer air ring 2 is provided with a connecting member 23 at the position corresponding to the actuating member 9101. The connecting member 23 has a groove 2301 for the actuating member 9101 to be inserted into. The direction in which the actuating member 9101 is inserted into the groove 2301 is perpendicular to the direction through which the groove 2301 is connected. Two guide members 2302 are provided inside the groove 2301. The two guide members 2302 are respectively provided on two parallel side walls of the groove 2301, and there is a horizontal height difference between the two guide members 2302. The guide members 2302 have a conical structure. When the actuating member 9101 moves downward, the actuating member 9101 abuts against the guide member 2302, thereby pushing the guide member 2302 to move, and then pushing the outer air ring 2 to move. The outer air ring 2 pushes the hinge rod 63 to move through the abutting block 24, thereby achieving the effect of giving the pushing mechanism 6 initial power.

[0034] The pushing mechanism 6 includes a sealed cylinder 61 and a piston 64 slidably disposed inside the sealed cylinder 61. A heat insulation component 62 is provided inside the sealed cylinder 61, dividing it into a heating zone and a heat dissipation zone. The heating zone is in contact with the annular die head opening 5, and the heating zone and the heat dissipation zone are interconnected. When the annular die head opening 5 conducts heat from the membrane bubble into the heating zone, the gas inside the heating zone expands due to heat and flows towards the heat dissipation zone, thus pushing the piston 64 towards the outer air ring 2. The piston 64 then pushes the heat insulation component 62 towards the heating zone via a transmission mechanism, thereby moving the heating zone... All the internal gas is directed to the heat dissipation zone, allowing the gas to better push the piston 64 outward. At the same time, the heat insulation component 62 is used to isolate the heat transmission of the membrane bubble. The sealed cylinder 61 is made of a material with good heat dissipation performance in the heat dissipation zone, which accelerates the cooling speed of the gas in the heat dissipation zone. As the gas temperature drops, the gas pressure decreases, causing the piston 64 to move away from the outer air ring 2. At the same time, the transmission mechanism drives the heat insulation component 62 to move towards the heat dissipation zone, squeezing the gas in the heat dissipation zone to flow into the heating zone, thereby accelerating the heating speed of the gas. This achieves a reciprocating alternating effect, allowing the transmission mechanism to continuously drive.

[0035] The transmission mechanism includes connecting rods 65, a crankshaft 66 rotatably mounted on the base 1, and a pushing assembly for reciprocatingly pushing the abutment block 24. Two connecting rods 65 are provided, each connected to a piston 64 and a heat shield 62 respectively. The other end of each connecting rod 65 is connected to the crankshaft 66. The position where the connecting rod 65 connects to the crankshaft 66 and the heat shield 62 forms a 90-degree angle with the position where the connecting rod 65 connects to the piston 64 in the clockwise direction of rotation. When the crankshaft 66 rotates, it simultaneously drives the piston 64 and the heat shield 62 to move via the two connecting rods 65, utilizing the 90-degree angle... The included angle causes the piston 64 and the heat insulation 62 to move at a difference of one-quarter, ensuring mutual transmission between the piston 64 and the heat insulation 62. The crankshaft 66 is connected to the push assembly, which includes a turntable 67 fixedly mounted on the crankshaft 66, a hinge rod 63 for pushing the abutment block 24 to move, and a rotating member 68 with two ends rotatably connected to the turntable 67 and the hinge rod 63 respectively. When the crankshaft 66 rotates, it drives the turntable 67 to rotate. The turntable 67 pushes the hinge rod 63 to make linear reciprocating motion through the rotating member 68, thereby achieving the reciprocating pushing effect of the hinge rod 63 on the abutment block 24.

[0036] Meanwhile, a fixing member 26 is fixedly installed on the base 1. An elastic member 25 is provided between the fixing member 26 and the abutment block 24 to push the abutment block 24 to reset its position. When the hinge rod 63 moves away from the abutment block 24, the elastic member 25 pushes the abutment block 24 to reset its position to ensure the abutment between the hinge rod 63 and the abutment block 24, thereby ensuring the stability of subsequent transmission.

[0037] Working Principle: The blown film machine starts, and molten plastic is filtered through the die head and extruded through the heated die head. The molten plastic is then pulled through a bubble stabilizer, a herringbone plate, and a traction roller, finally reaching the coiling device. Then, the cold air ring is activated, and airflow is introduced into the air guide cavity through the connection port 3. The airflow first fills the buffer cavity 8. When the air pressure exceeds the elastic support force of the elastic element 92, it pushes the blocking member 91 downwards, and the airflow is introduced into the outlet cavity 7. Then, it is blown onto the bubble through the first upper air outlet 21 and the first lower air outlet 22. Simultaneously, as the airflow passes through the first upper air outlet 21, the aperture increases, causing the airflow velocity to decrease; as the airflow passes through the first lower air outlet 22, the aperture decreases, causing the airflow velocity to increase. This ensures that the airflow velocities from the first upper air outlet 21 and the first lower air outlet 22 are the same, thus guaranteeing that the force exerted by the gas on the bubble formation is equal. Simultaneously, the molten plastic needs to be pulled out first, so that the temperature of the molten plastic has been conducted into the sealed cylinder 61 to achieve a preheating effect. This causes the blocking member 91 to move downward and abut against the guide member 2302 through the actuating member 9101, pushing the guide member 2302 to move, which in turn pushes the outer air ring 2 to move. The outer air ring 2 pushes the hinge rod 63 to move through the abutting block 24. The hinge rod 63 pushes the turntable 67 to rotate through the rotating member 68. There are two guide members 2302, which are respectively set on two parallel side walls of the groove 2301. When the actuating member 9101 contacts the two guide members 2302, it will drive the outer air ring 2 to reciprocate, which will drive the abutting block 24 to reciprocate, so that the hinge rod 63 forms a reciprocating linear motion, ensuring the rotation angle of the turntable 67 and providing initial power to the pushing mechanism 6.

[0038] Turntable 67 drives crankshaft 66 to rotate. Crankshaft 66, through two connecting rods 65, drives piston 64 and heat shield 62 to move, providing initial power to the pushing mechanism 6. At this time, the gas inside the heating zone has been heated and expanded into the heat dissipation zone. Together with the initial power, piston 64 moves away from the heating zone. Piston 64, through the transmission mechanism, pushes heat shield 62 towards the heating zone, thus guiding all the gas inside the heating zone to the heat dissipation zone. This allows the gas to better push piston 64 outward. Simultaneously, the heat shield 62 isolates the heat transfer of the membrane bubble, accelerating the cooling speed of the gas in the heat dissipation zone. As the gas temperature decreases... The decrease in air pressure causes the piston 64 to move closer to the outer air ring 2. At the same time, the transmission mechanism drives the heat insulation 62 to move towards the heat dissipation area, squeezing the gas in the heat dissipation area towards the heating area, accelerating the gas to enter the heating area for heating, and achieving a reciprocating alternating effect. This allows the transmission mechanism to continuously drive, thereby ensuring the cyclic rotation effect of the crankshaft 66. The crankshaft 66 drives the turntable 67 to rotate, and the turntable 67 pushes the hinge rod 63 to make linear reciprocating motion through the rotating part 68. In turn, the hinge rod 63 achieves a reciprocating pushing effect on the abutment block 24, driving the outer air ring 2 to rotate reciprocally, thereby changing the position of the air outlet on the outer air ring 2 in real time, ensuring that the surface of the membrane bubble can dissipate heat evenly.

[0039] At the same time, the airflow is introduced into the inner wind ring 4, and the airflow comes into contact with the arc-shaped protrusion 42 to achieve the effect of dispersion and diversion. Meanwhile, when the airflow passes through the second upper wind port 41, the aperture changes from small to large, which makes the airflow velocity decrease. When the airflow passes through the second lower wind port 43, the aperture changes from large to small, which makes the airflow velocity increase. This ensures that the airflow velocities exited by the second upper wind port 41 and the second lower wind port 43 are the same, thereby ensuring that the force exerted by the gas on the formation of the membrane bubble is the same.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cold air ring for producing a roll film, comprising a base (1) and a connecting port (3) for introducing an air flow, characterized in that, The base (1) is provided with an outer air ring (2) and an inner air ring (4), the outer air ring (2) and the inner air ring (4) are provided with air outlets for guiding cold air to the film bubble, the lower part of the inner air ring (4) is connected with a fan, the outer air ring (2) and the inner air ring (4) are provided with an annular die mouth (5) for extruding the film bubble, the base (1) is provided with a wind guide cavity, and the wind guide cavity is communicated with the outer air ring (2), the wind guide cavity is provided with a separation component (9) for separating the wind guide cavity into a buffer cavity (8) and a guide cavity (7), the separation component (9) is provided with a blocking piece (91) for controlling the communication between the buffer cavity (8) and the guide cavity (7), and the separation component (9) is further provided with an elastic element (92) for pushing the blocking piece (91) to close the communication between the buffer cavity (8) and the guide cavity (7). The outer air ring (2) is slidably arranged on the base (1), and the base (1) is provided with a pushing mechanism (6) for reciprocating rotating the outer air ring (2) by the heat of the film bubble, the outer air ring (2) is provided with an abutting block (24) at the connecting position with the pushing mechanism (6), and the blocking piece (91) is fixedly provided with a poking piece (9101) for poking the outer air ring (2) to rotate to provide initial power for the pushing mechanism (6).

2. The cold air ring for producing a roll film according to claim 1, wherein: The pushing mechanism (6) comprises a sealed air cylinder (61) and a piston piece (64) slidably arranged in the sealed air cylinder (61), the sealed air cylinder (61) is provided with a heat insulating piece (62) for separating the sealed air cylinder (61) into a heating area and a heat dissipation area, the heating area is in contact with the annular die mouth (5), and the heating area and the heat dissipation area are communicated with each other, the heat insulating piece (62) and the piston piece (64) are connected with a transmission mechanism for mutual transmission, and the transmission mechanism abuts against the outer air ring (2).

3. The cold air ring for producing a roll film according to claim 2, wherein: The transmission mechanism comprises connecting rods (65), a crankshaft (66) rotatably arranged on the base (1), and a pushing assembly for reciprocally pushing the abutting block (24), the connecting rods (65) are provided with two, and the two connecting rods (65) are respectively connected with the piston piece (64) and the heat insulating piece (62), and the other ends of the two connecting rods (65) are connected with the crankshaft (66), the positions of the crankshaft (66) and the heat insulating piece (62) connected with the connecting rods (65) are at a ninety-degree angle in the clockwise rotation direction with the positions of the crankshaft (66) and the piston piece (64) connected with the connecting rods (65), and the crankshaft (66) is connected with the pushing assembly.

4. The cold air ring for producing a roll film according to claim 3, wherein: The pushing assembly comprises a rotating disc (67) fixedly arranged on the crankshaft (66), a hinged rod (63) for pushing the abutting block (24) to move, and two rotating pieces (68) respectively rotatably connected with the rotating disc (67) and the hinged rod (63).

5. The cold air ring for producing a roll film according to any one of claims 1 to 4, characterized in that: The base (1) is fixedly provided with a fixing piece (26), and the fixing piece (26) and the abutting block (24) are provided with an elastic piece (25) for pushing the abutting block (24) to reset.

6. The cold air ring for producing a roll film according to claim 1, wherein: The outer air ring (2) is provided with a connecting piece (23) corresponding to the position of the shifting piece (9101), the connecting piece (23) is provided with a groove (2301) for embedding the shifting piece (9101), the direction of the shifting piece (9101) embedded in the groove (2301) is perpendicular to the direction of the groove (2301), the groove (2301) is provided with two guide pieces (2302), the two guide pieces (2302) are respectively arranged on two parallel side walls of the groove (2301), and there is a horizontal height difference between the two guide pieces (2302), and the guide piece (2302) is a conical structure.

7. The cold air ring for producing a roll film according to claim 1, wherein: The outer air ring (2) comprises a first upper air port (21) and a first lower air port (22), the inner air ring (4) comprises a second upper air port (41) and a second lower air port (43), and the first upper air port (21) and the second upper air port (41) are respectively located on the side of the first lower air port (22) and the second lower air port (43) away from the die orifice (5) of the ring die, the first upper air port (21) and the first lower air port (22) and the second upper air port (41) and the second lower air port (43) are all conical structures, the first upper air port (21) and the second upper air port (41) are both arranged with the opening large end pointing to the bubble, and the first lower air port (22) and the second lower air port (43) are both arranged with the opening small end pointing to the bubble.

8. The cold air ring for producing a roll film according to claim 7, wherein: The inner air ring (4) is provided with an arc-shaped protrusion (42) for dispersing the airflow.

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