A co-extruded film cooling device

Abstract

The application discloses a kind of co-extrusion film cooling device, it is related to co-extrusion film cooling technical field.The present application includes rack, the bottom of the rack is fixedly installed with blow film machine, the outlet of the blow film machine is provided with blow film cover, the inside of blow film cover is provided with inner blow film head, the top of the inner blow film head is provided with exhaust pipe, the top of the rack is installed with upper clamping traction system;The inside of the rack is provided with outer cooling component.The present application is provided with spiral elastic support and length limiting control hose according to the specification of film, select appropriate length limiting control hose according to the specification of film, when the internal pressure of bubble is suddenly reduced, according to the feedback of bubble radius detection sensor, spiral elastic support spiral radius is reduced, drive cooling plate and bubble different operation, reduce air flow, reduce the pressure of cooling gas to bubble, reduce bubble pressure, so that bubble pressure can be self-adapting adjustment, prevent bubble from collapsing because of internal pressure is too small, bubble pressure is too large.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of co-extrusion film cooling, in particular to a co-extrusion film cooling device. BACKGROUND

[0002] Co-extrusion film technology refers to the process of simultaneously processing two or more different polymer materials through extrusion technology during production to form a multi-layer structure of film material. In the production process of co-extrusion film, the cooling device plays a crucial role as a key link. The design and operation effect of the cooling system directly affect the uniformity of the film thickness, the surface finish, and the physical properties of the film. Therefore, a stable co-extrusion film cooling device is of great significance to improve the production efficiency of co-extrusion film and the quality of film material.

[0003] The commonly used cooling method for co-extrusion film is the IBC film bubble cooling system, which is a cooling technology applied in the film extrusion process, especially for the production of co-extrusion film, blown film and other polymer film materials. The main feature of the IBC system is to directly cool the melt state of the film inside the film through air flow or other cooling medium, thereby achieving rapid cooling and stable forming of the film. When using the bubble cooling system, the stability of the bubble is a major problem. If the bubble is too large, it may cause uneven cooling, and if it is too small, it may not effectively remove heat. How to accurately control the size and density of the bubble is a major challenge in design. The current common method is to set multiple bubble stabilizing rollers outside the film bubble to adjust the size of the bubble. The patent with publication number CN213947168U discloses a cooling device for a three-layer co-extrusion blown film machine. The bubble stabilizing rollers are arranged similarly to the cooling rollers in the above-mentioned patent. The disadvantage of the above-mentioned external cooling and bubble stabilization is that the bubble stabilizing rollers and the cooling rollers are both horizontally arranged, that is, tangent to the film bubble, and the contact point is usually only a part of the film surface, causing the bubble to tend to be polygonal during the bubble stabilization process, resulting in uneven pressure on the film surface and easily causing indentation and wrinkles on the film surface. When the internal pressure of the film bubble suddenly decreases, the stability of the film bubble decreases, and the existing bubble stabilization system controls the inward movement of the bubble stabilizing rollers to be too long, which increases the pressure on the film bubble and further damages the stability of the film bubble. The film bubble may deform and collapse, and in severe cases, it may even completely collapse, affecting the normal progress of the blown film process and causing production to stop. At the same time, the cooling roller can only cool part of the film surface, and the other parts of the film are still at a high temperature, so the temperature difference of the film during the cooling process is large, and the cooling and forming effect is poor. SUMMARY

[0004] The present application aims to solve the above problems and provides a co-extrusion film cooling device.

[0005] To achieve the above-mentioned purposes, the present application specifically adopts the following technical solutions:

[0006] A co-extrusion film cooling device, comprising a rack, a film blowing machine is fixedly installed at the bottom of the rack, an outlet of the film blowing machine is provided with a film blowing cover, an inner film blowing head is arranged in the film blowing cover, an exhaust pipe is arranged at the top of the inner film blowing head, an upper clamping traction system is installed at the top of the rack;

[0007] An outer cooling assembly is arranged in the rack, the outer cooling assembly comprises an outer frame which can be lifted in the rack, a bubble radius detection sensor is arranged at the bottom of the outer frame, an upper adjusting ring is rotatably installed at the inner top of the outer frame, a lower adjusting ring is rotatably installed at the inner bottom of the outer frame, a plurality of spiral elastic supports are arranged in the inner part of the upper adjusting ring and the lower adjusting ring, a plurality of rotating shafts are rotatably installed in the spiral elastic supports, an installation head is arranged at the inner side of the rotating shaft, the installation head can be automatically kept horizontal, a cooling plate is arranged in the installation head, a plurality of spray holes are arranged at the outer side of the cooling plate, a limiting control hose is arranged between the outer end of the rotating shaft and the cooling plate, and the limiting control hose is arranged on the upper surface of the spiral elastic support.

[0008] Further, a rectangular slide rod is arranged at the outer end of the rotating shaft, a plurality of sleeve rings are arranged between the upper adjusting ring and the lower adjusting ring, a rectangular slide hole is arranged in the inner part of the sleeve ring, the upper adjusting ring and the lower adjusting ring, and the rectangular slide rod penetrates the rectangular slide hole.

[0009] Further, a connecting rotating ring is rotatably installed at the top and the bottom of the sleeve ring, and a connecting rotating ring is rotatably installed at the bottom of the upper adjusting ring and the top of the lower adjusting ring, and two groups of connecting rods which are hingedly connected with each other are hingedly connected between adjacent connecting rotating rings.

[0010] Further, a quick plug connector is arranged at the outer side of the rectangular slide rod and the outer side of the cooling plate, and the limiting control hose is connected with the two groups of quick plug connectors.

[0011] Further, a cooling gas pipe is arranged at the outer side of the outer frame, a connecting gas pipe is arranged at the end of the rectangular slide rod which is away from the installation head, the connecting gas pipe is connected with the quick plug connector on the rectangular slide rod and the cooling gas pipe, and the length of the connecting gas pipe is greater than the straight line length between the rectangular slide rod and the cooling gas pipe.

[0012] Further, an upper servo motor is fixedly installed at the top of the outer frame, an upper driving wheel is fixedly installed at the output end of the upper servo motor, a lower servo motor is fixedly installed at the bottom of the outer frame, a lower driving wheel is fixedly installed at the output end of the lower servo motor, an upper transmission gear ring is arranged at the outer side of the upper adjusting ring, a lower transmission gear ring is arranged at the outer side of the lower adjusting ring, the upper driving wheel is engaged with the upper transmission gear ring, and the lower driving wheel is engaged with the lower transmission gear ring, and the directions of the upper servo motor and the lower servo motor are opposite.

[0013] Further, the rack is composed of three layers of platforms, and a through hole is formed in the inner part of each layer of platform.

[0014] Further, two groups of lifting hydraulic cylinders are fixedly installed on the top of the rack, and the exoskeleton is fixedly installed on the bottom of the telescopic end of the two groups of lifting hydraulic cylinders and can pass through the through hole.

[0015] Further, a spiral tensile metal wire is arranged on the inner wall of the limiting control hose.

[0016] Further, the upper surface of the spiral elastic support is arranged in an arc shape.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The present application adopts the spiral distribution mode of the cooling plate to externally cool the membrane bubble, and the spiral distribution of multiple groups of cooling plates can keep the temperature of each region of the membrane bubble relatively consistent during the cooling process, avoids the warping caused by the too fast cooling of a part, and has high cooling quality.

[0019] 2. The present application can give the spiral elastic support a torsional force through the synchronous reverse rotation of the upper adjusting ring and the lower adjusting ring, and when the torsional force is increased, the spiral elastic support moves inward, the spiral radius is reduced, and the spiral turns are increased, so that the present application can be applied to the cooling of membrane bubbles of different sizes, has a wide application range, and can adjust the pressure on the membrane bubble by adjusting the spiral radius during the bubble stabilizing process, and the pressure given to the membrane bubble is spiral pressure, so that the membrane bubble can be stably kept in a cylindrical shape, and the surface of the thin film is uniformly pressed.

[0020] 3. The present application can make the cooling air flow always vertically blow to the thin film through the arrangement of the cooling plate which is always kept horizontal, the cooling air direction will not have a too large change during the bubble stabilizing process, the cooling is uniform, and the thin film is not easy to have wrinkles, and the bubble stabilizing and cooling quality is high.

[0021] 4. The present application can select a suitable length of the limiting control hose according to the specification of the thin film through the arrangement of the spiral elastic support and the limiting control hose, when the internal pressure of the membrane bubble is suddenly reduced, the spiral radius of the spiral elastic support is reduced according to the feedback of the membrane bubble radius detection sensor, the cooling plate and the membrane bubble are driven to have different operations, the spiral turns of the spiral elastic support are increased in the same length, the horizontal inclination angle of the spiral is reduced, that is, the horizontal included angle between the cooling plate and the spiral elastic support is reduced, at this time, the limiting control hose is subjected to a tensile and compressive force, the cavity of the contact part of the limiting control hose and the spiral elastic support is reduced, and then the air flow can be reduced, the pressure of the cooling gas on the membrane bubble can be reduced, the bubble stabilizing pressure can be reduced, the bubble stabilizing pressure can be self-adaptively adjusted, and the collapse of the membrane bubble caused by the too small internal pressure and the too large bubble stabilizing pressure can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the external cooling component structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the blown film machine structure of the present invention;

[0025] Figure 4 This is an exploded structural diagram of the external cooling component of the present invention;

[0026] Figure 5 This is a schematic diagram of the outer ring transmission structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the spiral elastic support structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the rectangular slide bar and cooling plate structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the limit control hose structure of the present invention.

[0030] Reference numerals: 1. Frame; 2. Blown film machine; 21. Blown film hood; 22. Inner blown film head; 23. Exhaust pipe; 3. Upper clamping traction system; 4. Lifting hydraulic cylinder; 5. Outer frame; 51. Cooling air pipe; 52. Upper servo motor; 53. Upper drive wheel; 54. Lower servo motor; 55. Lower drive wheel; 56. Bubble radius detection sensor; 6. Upper adjusting ring; 61. Upper transmission gear ring; 7. Lower adjusting ring; 71. Lower transmission gear ring; 8. Outer ring; 81. Rectangular sliding hole; 9. Connecting swivel; 10. Connecting rod; 11. Spiral elastic support; 12. Rectangular sliding rod; 13. Rotating shaft; 14. Mounting head; 15. Quick-connect connector; 16. Cooling plate; 161. Spray hole; 17. Limit control hose; 18. Connecting air pipe. Detailed Implementation

[0031] 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.

[0032] Example 1, as Figures 1-8 As shown, a co-extruded film cooling device includes a frame 1, a blown film machine 2 is fixedly installed at the bottom of the frame 1, a blown film hood 21 is provided at the outlet of the blown film machine 2, an inner blown film head 22 is provided inside the blown film hood 21, an exhaust pipe 23 is provided at the top of the inner blown film head 22, and an upper clamping traction system 3 is installed at the top of the frame 1.

[0033] The inner part of the frame 1 is provided with an outer cooling assembly, which comprises an outer skeleton 5 capable of lifting in the frame 1, the bottom of the outer skeleton 5 is provided with a bubble radius detection sensor 56, the inner top of the outer skeleton 5 is rotatably installed with an upper adjusting ring 6, the inner bottom of the outer skeleton 5 is rotatably installed with a lower adjusting ring 7, the inner part of the upper adjusting ring 6 and the lower adjusting ring 7 is provided with a plurality of spiral elastic supports 11, the inner part of the spiral elastic support 11 is rotatably installed with a plurality of rotating shafts 13, the inner side of the rotating shaft 13 is provided with a mounting head 14, the mounting head 14 can automatically keep horizontal, the inner part of the mounting head 14 is provided with a cooling plate 16, the outer side of the cooling plate 16 is provided with a plurality of spray holes 161, the outer end of the rotating shaft 13 and the cooling plate 16 are provided with a limiting control hose 17, the limiting control hose 17 is placed on the upper surface of the spiral elastic support 11.

[0034] The inner wall of the limiting control hose 17 is provided with a spiral tensile metal wire to improve the tensile strength, and the upper surface of the spiral elastic support 11 is arc-shaped to prevent scratching the limiting control hose 17.

[0035] After the film enters the film blowing machine 2, it is blown into a bubble by the inner film blowing head 22, the airflow flows from bottom to top, the hot airflow is blown upward and discharged through the exhaust pipe 23 to perform IBC film bubble cooling. The cooling efficiency of the IBC film bubble cooling system alone is not high enough, so the outer cooling assembly is arranged outside the film bubble to combine cooling and bubble stabilization together.

[0036] The outer cooling airflow is sprayed out through the spray holes 161 on the cooling plate 16, and the cooling airflow is horizontally directed to the film bubble. Under the action of the spiral elastic support 11, the cooling plate 16 is spirally distributed, which can keep the temperature of each area of the film bubble relatively uniform during the cooling process, avoid warping caused by too fast cooling of a part, and improve the cooling quality. At the same time, the bubble stabilization pressure is given to the film bubble by using air pressure, and the bubble stabilization pressure is spirally distributed in the circumference, the film bubble is uniformly stressed, the state of the film bubble is more close to cylindrical, which can better keep the stable form and avoid unnecessary deformation.

[0037] In the running process, the membrane bubble radius detection sensor 56 (such as a laser sensor, an infrared sensor or a vision system) monitors the diameter and shape of the membrane bubble in real time, and the real-time data provided by the sensor are received by the control system and used to calculate the size change of the membrane bubble. The control unit (usually a PLC or an embedded controller) in the system receives the data of the size of the membrane bubble, calculates the optimal position of the bubble stabilizing roller by using a preset control algorithm, and adjusts the position of the bubble stabilizing roller according to the change of the membrane bubble. The control unit adjusts the position of the bubble stabilizing roller by controlling the synchronous reverse rotation of the upper adjusting ring 6 and the lower adjusting ring 7, so as to apply a torsional force or reduce the torsional force on the spiral elastic support 11. When the torsional force is reduced, the radius of the spiral elastic support 11 increases, and the spiral elastic support 11 moves away from the membrane bubble through the mounting head 14 and the cooling plate 16; when the torsional force is increased, the radius of the spiral elastic support 11 decreases, and the spiral elastic support 11 moves towards the membrane bubble through the mounting head 14 and the cooling plate 16, thereby adjusting the bubble. When the internal gas pressure of the membrane bubble suddenly decreases, the torsional force increases, and the height between the upper adjusting ring 6 and the lower adjusting ring 7 remains unchanged. At the same height, the radius of the spiral elastic support 11 decreases, the number of turns of the spiral elastic support 11 increases, and the spiral angle decreases. Since the mounting head 14 always keeps the cooling plate 16 horizontal, the angle between the upper surface of the spiral elastic support 11 and the cooling plate 16 decreases, and the cooling plate 16 drives the limiting control hose 17 to swing downward relative to the spiral elastic support 11. The limiting control hose 17 is stretched and pressed on the upper surface of the spiral elastic support 11, and the limiting control hose 17 is in contact with the spiral elastic support 11. The position of the limiting control hose 17 is flattened, the flow of the gas is limited, and the bubble stabilizing pressure is reduced, so that the bubble stabilizing pressure can be self-adaptively adjusted, thereby preventing the membrane bubble from collapsing due to excessive internal pressure and excessive bubble stabilizing pressure.

[0038] Meanwhile, the present application can automatically adjust the outer cooling radius according to the size of the membrane bubble by the setting of the spiral elastic support 11, and has a wide range of applications. It should be noted that during the range adjustment process, the limiting control hose 17 is not installed first, and is installed after the adjustment is completed. According to the pressure stabilizing adjustment range, the corresponding limiting control hose 17 is selected to have an extendable length. The advantage of this design is that when the internal gas pressure of the membrane bubble is too small and far exceeds the pressure stabilizing range, if it is not controlled, the cooling plate 16 will be excessively gathered, which can easily cause the membrane bubble to be excessively squeezed and folded together, causing a larger safety accident. Therefore, when the internal gas pressure of the membrane bubble far exceeds the pressure stabilizing range, the limiting control hose 17 cannot be stretched under the action of the spiral tensile metal wire, thereby limiting the spiral elastic support 11 from continuing to gather, preventing excessive squeezing, and improving the overall system operation stability.

[0039] The embodiment two, on the basis of the above embodiment, further comprises that the outer end of the rotating shaft 13 is provided with a rectangular slide rod 12, a plurality of sleeve rings 8 are arranged between the upper adjusting ring 6 and the lower adjusting ring 7, the inner part of the sleeve ring 8, the upper adjusting ring 6 and the lower adjusting ring 7 are all provided with a rectangular slide hole 81, and the rectangular slide rod 12 penetrates the rectangular slide hole 81.

[0040] The top and bottom of the sleeve ring 8 are rotatably installed with the connecting ring 9, and the bottom of the upper adjusting ring 6 and the top of the lower adjusting ring 7 are rotatably installed with the connecting ring 9, and two groups of mutually hinged connecting rods 10 are hinged between adjacent connecting rings 9.

[0041] The upper adjusting ring 6 and the lower adjusting ring 7 drive the spiral elastic support 11 to twist through the rectangular slide rod 12, the spiral elastic support 11 drives the cooling plate 16 to twist synchronously, because the hinged connecting rod 10 is distributed in the form of at least three groups of rings between adjacent connecting rings 9, and swings in the rectangular hinged groove, therefore the adjacent connecting rings 9 can stably keep the horizontal state lifting, the connecting ring 9 can keep the sleeve ring 8 in the horizontal state lifting, and can rotate on the horizontal plane, therefore under the action of the rectangular slide rod 12, the sleeve ring 8 rotates synchronously, and makes the rectangular slide rod 12 on the multiple spiral elastic supports 11 twist the same angle, always located on the same plane, improves the deformation stability of the spiral elastic support 11, at the same time, because the sleeve ring 8 always keeps the horizontal state, therefore the rectangular slide rod 12 always keeps the horizontal state, and the rectangular slide rod 12 makes the mounting head 14 always keep the horizontal state. Through the setting of the embodiment, while ensuring the stable deformation of the plurality of spiral elastic supports 11, the mounting head 14 can always keep the horizontal state, without additional complex control, and the structure is simple.

[0042] The embodiment three, on the basis of the above embodiment, further comprises that the outer side of the rectangular slide rod 12 and the outer side of the cooling plate 16 are both provided with quick plug connectors 15, and the limiting control hose 17 is connected to the two groups of quick plug connectors 15. Through the setting of the quick plug connector 15, the limiting control hose 17 can be quickly disassembled and connected.

[0043] The embodiment four, on the basis of the above embodiment, further comprises that the outer side of the outer skeleton 5 is provided with a cooling gas pipe 51, and the end of the rectangular slide rod 12 away from the mounting head 14 is provided with a connecting gas pipe 18, the connecting gas pipe 18 is connected to the cooling gas pipe 51 and the quick plug connector 15 on the rectangular slide rod 12, and the length of the connecting gas pipe 18 is greater than the straight line length between the rectangular slide rod 12 and the cooling gas pipe 51.

[0044] The outer cooling gas enters the connecting gas pipe 18 through the cooling gas pipe 51, then enters the cooling plate 16 through the limiting control hose 17, and finally is sprayed out through the spray hole 161, and the connecting gas pipe 18 does not affect the sliding of the rectangular slide rod 12 relative to the sleeve ring 8.

[0045] The embodiment five, on the basis of the above embodiment, further comprises that the top of the exoskeleton 5 is fixedly installed with an upper servo motor 52, the output end of the upper servo motor 52 is fixedly installed with an upper driving wheel 53, the bottom of the exoskeleton 5 is fixedly installed with a lower servo motor 54, the output end of the lower servo motor 54 is fixedly installed with a lower driving wheel 55, the outer side of the upper adjusting ring 6 is provided with an upper transmission gear ring 61, the outer side of the lower adjusting ring 7 is provided with a lower transmission gear ring 71, the upper driving wheel 53 is engaged with the upper transmission gear ring 61, the lower driving wheel 55 is engaged with the lower transmission gear ring 71, and the rotation directions of the upper servo motor 52 and the lower servo motor 54 are opposite.

[0046] By controlling the synchronous reverse rotation of the upper servo motor 52 and the lower servo motor 54, the upper servo motor 52 and the lower servo motor 54 drive the upper adjusting ring 6 and the lower adjusting ring 7 to rotate through the upper transmission gear ring 61 and the lower transmission gear ring 71 respectively, and the servo motor has high control precision.

[0047] The embodiment six, on the basis of the above embodiment, further comprises that the rack 1 is composed of three layers of platforms, and through holes are formed in the interiors of the platforms. The platforms and the through holes are arranged to facilitate the maintenance and replacement of the external cooling assembly.

[0048] The top of the rack 1 is fixedly installed with two groups of lifting hydraulic cylinders 4, the exoskeleton 5 is fixedly installed at the bottom of the telescopic ends of the two groups of lifting hydraulic cylinders 4 and can pass through the through holes.

[0049] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A co-extruded film cooling device, comprising a frame (1), characterized in that, A blown film machine (2) is fixedly installed at the bottom of the frame (1). A blown film hood (21) is provided at the outlet of the blown film machine (2). An inner blown film head (22) is provided inside the blown film hood (21). An exhaust pipe (23) is provided at the top of the inner blown film head (22). An upper clamping traction system (3) is installed at the top of the frame (1). The frame (1) is equipped with an external cooling assembly, which includes an outer frame (5) that can be raised and lowered inside the frame (1). A membrane bubble radius detection sensor (56) is provided at the bottom of the outer frame (5). An upper adjusting ring (6) is rotatably installed at the top inner part of the outer frame (5), and a lower adjusting ring (7) is rotatably installed at the bottom inner part of the outer frame (5). Several spiral elastic supports (11) are provided inside the upper adjusting ring (6) and the lower adjusting ring (7). Several rotating shafts (13) are rotatably installed inside the spiral elastic supports (11). An installation head (14) is provided on the inner side of the rotating shaft (13). The installation head (14) can automatically maintain a horizontal position. A cooling plate (16) is provided inside the installation head (14). Several spray holes (161) are provided on the outer side of the cooling plate (16). A limit control hose (17) is provided between the outer end of the rotating shaft (13) and the cooling plate (16). The limit control hose (17) rests on the upper surface of the spiral elastic support (11).

2. The co-extruded film cooling device according to claim 1, characterized in that, A rectangular slide rod (12) is provided at the outer end of the rotating shaft (13). Several outer rings (8) are provided between the upper adjusting ring (6) and the lower adjusting ring (7). A rectangular sliding hole (81) is provided through the interior of the outer ring (8), the upper adjusting ring (6) and the lower adjusting ring (7). The rectangular slide rod (12) passes through the rectangular sliding hole (81).

3. The co-extruded film cooling device according to claim 2, characterized in that, The top and bottom of the outer ring (8) are rotatably mounted with connecting rings (9), and the bottom of the upper adjusting ring (6) and the top of the lower adjusting ring (7) are rotatably mounted with connecting rings (9). Two sets of connecting rods (10) are hinged between adjacent connecting rings (9).

4. A co-extruded film cooling device according to claim 3, characterized in that, The outer side of the rectangular slide bar (12) and the outer side of the cooling plate (16) are both provided with quick-connect connectors (15), and the limit control hose (17) connects the two sets of quick-connect connectors (15).

5. A co-extruded film cooling device according to claim 4, characterized in that, A cooling air pipe (51) is provided on the outer side of the outer frame (5). A connecting air pipe (18) is provided at the end of the rectangular slide rod (12) away from the mounting head (14). The connecting air pipe (18) connects the cooling air pipe (51) to the quick connector (15) on the rectangular slide rod (12). The length of the connecting air pipe (18) is greater than the straight length between the rectangular slide rod (12) and the cooling air pipe (51).

6. A co-extruded film cooling device according to claim 1, characterized in that, An upper servo motor (52) is fixedly installed on the top of the outer frame (5), and an upper drive wheel (53) is fixedly installed on the output end of the upper servo motor (52). A lower servo motor (54) is fixedly installed on the bottom of the outer frame (5), and a lower drive wheel (55) is fixedly installed on the output end of the lower servo motor (54). An upper transmission gear ring (61) is provided on the outer side of the upper adjusting ring (6), and a lower transmission gear ring (71) is provided on the outer side of the lower adjusting ring (7). The upper drive wheel (53) meshes with the upper transmission gear ring (61), and the lower drive wheel (55) meshes with the lower transmission gear ring (71). The upper servo motor (52) and the lower servo motor (54) rotate in opposite directions.

7. A co-extruded film cooling device according to claim 1, characterized in that, The frame (1) consists of three platforms, each with a through hole inside.

8. A co-extruded film cooling device according to claim 7, characterized in that, Two sets of lifting hydraulic cylinders (4) are fixedly installed on the top of the frame (1), and the outer frame (5) is fixedly installed at the bottom of the telescopic ends of the two sets of lifting hydraulic cylinders (4) and can pass through the through hole.

9. A co-extruded film cooling device according to claim 1, characterized in that, The inner wall of the limit control hose (17) is provided with a spiral tensile metal wire.

10. A co-extruded film cooling device according to claim 1, characterized in that, The upper surface of the spiral elastic support (11) is arc-shaped.

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