Coextrusion film cooling mechanism

Abstract

The invention relates to a co-extrusion film cooling mechanism, and relates to the technical field of co-extrusion film processing, the co-extrusion film cooling mechanism comprises a base table, supporting plates are fixedly arranged on the two opposite edges of the upper surface of the base table in the vertical direction, an upper air cooling plate and a lower air cooling plate are arranged between the two supporting plates, the upper air cooling plate is located right above the lower air cooling plate, and the lower air cooling plate is located right above the base table. The two ends of the upper air cooling plate and the two ends of the lower air cooling plate are detachably connected with the side faces, close to each other, of the two supporting plates correspondingly. Flow guide cavities are formed in the upper air cooling plate and the lower air cooling plate, a plurality of cooling openings communicating with the corresponding flow guide cavities are formed in the side faces, close to each other, of the upper air cooling plate and the lower air cooling plate, and air cooling pipes communicating with the corresponding flow guide cavities are fixedly arranged on the side faces of the upper air cooling plate and the lower air cooling plate; an air pump which is connected with the air cooling pipe and supplies wind power is fixedly arranged on the base station; according to the device, the upper air cooling plate and the lower air cooling plate are used for conducting air cooling heat dissipation on the upper surface and the lower surface of the co-extrusion film at the same time, and the corresponding heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of co-extruded film processing, and in particular to a co-extruded film cooling mechanism. Background Art

[0002] Co-extruded film production equipment has shown a wide range of application value in the fields of packaging and protection, such as food packaging, express bags, metal protective films, etc. With its excellent tensile properties and surface brightness, as well as compliance with multiple standards such as coated films and food films, co-extruded films occupy an important position in the market. However, in the production process of co-extruded film, a technical problem gradually emerged, that is, after the layers are combined by hot melt, the extruded film still carries a lot of heat. If the co-extruded film is directly rolled up at this time, it is easy for the co-extruded film to stick together due to the heat not dissipating, which will undoubtedly cause trouble for normal use in the later stage.

[0003] In order to solve this problem, an air cooling device is usually installed after the extruder in the related art. The air cooling device uses the wind generated by the air pump to blow air to cool the co-extruded film, aiming to quickly remove the heat on the surface of the film and prevent it from bonding due to excessive temperature. This method solves the problem of co-extruded film bonding to a certain extent, but it also exposes its limitations in actual application.

[0004] In order to ensure that the co-extruded film is fully cooled and avoid the occurrence of sticking, it may be necessary to extend the air cooling time. However, although this approach is effective, it will undoubtedly reduce production efficiency and increase production costs. Long-term air cooling not only takes up valuable time on the production line, but may also lead to energy waste, and there is room for improvement. Summary of the invention

[0005] The purpose of the present application is to provide a co-extruded film cooling mechanism to solve the problem that the above-mentioned air cooling device has low efficiency and affects the production efficiency of the co-extruded film.

[0006] The present application provides a co-extrusion film cooling mechanism that adopts the following technical solution: A co-extruded film cooling mechanism comprises a base, support plates are fixedly provided on two opposite edges of the upper surface of the base plate in the vertical direction, an upper air-cooling plate and a lower air-cooling plate are provided between the two support plates, the upper air-cooling plate is located directly above the lower air-cooling plate, and the two ends of the upper air-cooling plate and the lower air-cooling plate are detachably connected to the side surfaces of the two support plates close to each other; guide cavities are provided inside the upper air-cooling plate and the lower air-cooling plate, and a plurality of cooling ports connected to the corresponding guide cavities are opened on the side surfaces of the upper air-cooling plate and the lower air-cooling plate close to each other, air-cooling pipes connected to the corresponding guide cavities are fixedly provided on the sides of the upper air-cooling plate and the lower air-cooling plate, and an air pump connected to the air-cooling pipe and supplying wind force is fixedly provided on the base.

[0007] By adopting the above technical scheme, during the application of the cooling mechanism, due to the combined arrangement of the upper air-cooling plate, the lower air-cooling plate, the air-cooling pipe and the air pump, the co-extruded film to be cooled is inserted between the upper air-cooling plate and the lower air-cooling plate in advance, and then the air pump is started to inject the external air flow into the guide cavity through the air-cooling pipe and spray it out from the cooling port, so that the upper air-cooling plate and the lower air-cooling plate are used to simultaneously cool the upper and lower surfaces of the co-extruded film, thereby improving the corresponding heat dissipation efficiency and also improving the overall production efficiency of the co-extruded film.

[0008] Optionally, both ends of the upper air-cooling plate and the lower air-cooling plate are slidably connected to the support plate, and a driving member capable of driving the upper air-cooling plate and the lower air-cooling plate to slide toward and away from each other is provided on the base.

[0009] By adopting the above technical solution, due to the setting of the driving member, the distance between the upper air cooling plate and the lower air cooling plate can be adjusted, thereby controlling the air cooling effect on the co-extruded film and improving the performance of the cooling mechanism.

[0010] Optionally, the driving member includes a driving motor fixed on the base in a vertical direction and a driving screw coaxially fixedly connected to the driving motor; the upper air-cooling plate and the lower air-cooling plate are respectively provided with a first screw hole and a second screw hole, and the outer periphery of the driving screw is provided with two sections of threads with opposite rotation directions, and the first screw hole and the second screw hole are respectively matched with the threads of the two sections of threads with different rotation directions.

[0011] By adopting the above technical scheme, due to the combined arrangement of the drive motor and the drive screw, and the first screw hole and the second screw hole respectively cooperate with the threads of the two sections of the threaded parts with different rotation directions; when the drive motor is running, the drive screw is driven to rotate synchronously, and then the upper air cooling plate and the lower air cooling plate are controlled to slide up and down in the direction of approaching or moving away from each other, thereby realizing the rapid adjustment of the distance between the upper air cooling plate and the lower air cooling plate.

[0012] Optionally, connecting rods are provided at both ends of the upper air-cooling plate, and the connecting rods are perpendicular to the length direction of the upper air-cooling plate. A protective curtain is provided above the base, and the two opposite edges of the protective curtain are detachably connected to the side surfaces of the two connecting rods that are close to each other.

[0013] By adopting the above technical solution, due to the combined setting of the connecting rod and the protective curtain, the staff can detachably fix the two opposite edges of the protective curtain on the connecting rod, thereby protecting the upper surface of the co-extruded film that has not been completely cooled and reducing the possibility of external dust or other impurities adhering to the upper surface of the co-extruded film.

[0014] Optionally, fixing pins are fixedly provided on two opposite edges of the protective curtain, and a fixing groove for the fixing pins to be inserted into is provided on the connecting rod.

[0015] By adopting the above technical solution, when installing the protective curtain, due to the coordinated setting of the fixing pin and the fixing groove, the fixing pin on the protective curtain can be inserted into the fixing groove on the connecting rod, thereby improving the installation efficiency of the protective curtain and facilitating the subsequent removal or replacement of the protective curtain according to actual needs.

[0016] Optionally, an accommodating notch is provided on the upper edge of the upper side of the upper air-cooling plate in its length direction, and the ends of the two connecting rods are rotatably connected to the inner walls at both ends of the accommodating notch respectively; a limiting member is provided above the base to keep the two connecting rods in a vertical state in the length direction of the upper air-cooling plate; the two connecting rods can rotate toward each other into the accommodating notch, and the upper side surface of the connecting rod is flush with the side surface of the upper air-cooling plate away from the base.

[0017] By adopting the above technical solution, due to the matching setting of the accommodating notch and the limiting member, when the two connecting rods are rotated to a state perpendicular to the length direction of the upper air-cooling plate, the limiting member is used to keep the two connecting rods perpendicular to the length direction of the upper air-cooling plate, which is convenient for the subsequent installation and fixation of the protective curtain; when the protective curtain is not needed, the limit on the connecting rod can also be released, and then the connecting rod can be rotated to be stored inside the accommodating notch; thereby improving the performance of the cooling structure.

[0018] Optionally, the limiting member is a limiting rod located above the upper air cooling plate, limiting blocks are fixed on the outer periphery of both ends of the limiting rod, and a limiting socket for the limiting block to be inserted is provided on the end of the connecting rod away from the upper air cooling plate.

[0019] By adopting the above technical solution, when the limit piece locks the connecting rod in a vertical state, due to the coordinated setting of the limit rod and the limit socket, the staff can insert the two limit blocks on the limit rod into the limit sockets on the two connecting rods, thereby quickly realizing the limitation of the connecting rod state, and also facilitating the subsequent rapid release of the locking limit of the connecting rod.

[0020] Optionally, the limit rod and the protective curtain are offset, and a accommodating cavity is opened inside the limit rod. A connector connected to the accommodating cavity is fixedly provided on the upper side of the limit rod, and the connector is used for detachable connection with the anti-sticking agent supply pipe. The side of the limit rod facing the base is provided with a plurality of nozzles for spraying the anti-sticking agent.

[0021] By adopting the above technical solution, during the use of the cooling mechanism, the staff can detachably connect the anti-sticking agent supply pipe and the connecting head according to actual needs, and then evenly spray the anti-sticking agent on the surface of the co-extruded film after the co-extruded film is cooled, so as to further reduce the possibility of adhesion of the co-extruded film during subsequent winding.

[0022] Optionally, an elastic clip is provided on the side of the limit block, and a first groove for the elastic clip to be inserted into is provided on the inner wall of the limit hole; a positioning slot for the limit block to be inserted into is provided on the upper side surface of the upper air-cooling plate, and a second groove for the elastic clip to be inserted into is provided on the inner wall of the positioning slot.

[0023] By adopting the above technical scheme, due to the coordinated arrangement of the elastic clip, the first groove and the second groove, when the limit rod limits the connecting rod, the elastic clip on the limit block is snapped into the first groove on the inner wall of the limit socket; when the limit rod releases the limit on the connecting rod, the limit rod can be placed above the upper air cooling plate, so that the limit block on the limit rod is snapped into the positioning slot and the elastic clip on the limit block is snapped into the second groove on the inner wall of the positioning slot; thereby improving the installation stability of the limit block inside the limit socket and the positioning slot.

[0024] Optionally, the upper air-cooling plate is provided with a receiving groove between two positioning slots, and the protective curtain can be removed and placed in the receiving groove.

[0025] By adopting the above technical solution, due to the opening of the accommodating trough, when the protective curtain is not in use, the protective curtain can be removed and placed in the accommodating trough, which is convenient for storing the protective curtain; when the protective curtain is placed into the accommodating trough, the limit block on the limit rod can also be inserted into the positioning slot. At this time, the limit rod also plays the role of a "cover plate" and can seal the opening of the accommodating trough.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: Due to the combined arrangement of the upper air-cooling plate, the lower air-cooling plate, the air-cooling pipe and the air pump, during the application of the cooling mechanism, the co-extruded film to be cooled is inserted between the upper air-cooling plate and the lower air-cooling plate in advance, and then the air pump is started to inject the external air flow into the guide cavity through the air-cooling pipe and spray it out from the cooling port, so that the upper air-cooling plate and the lower air-cooling plate are used to simultaneously cool the upper and lower surfaces of the co-extruded film, thereby improving the corresponding heat dissipation efficiency and also improving the overall production efficiency of the co-extruded film. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2It is a partial cross-sectional structural schematic diagram of the installation and coordination of the upper air cooling plate and the lower air cooling plate in the embodiment of the present application; Figure 3 It is a partial structural diagram of the embodiment of the present application showing the installation and coordination of the connecting rod and the protective curtain; Figure 4 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the protective curtain in the embodiment of the present application; Figure 5 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the limiter in the embodiment of the present application; Figure 6 yes Figure 5 A partial enlarged schematic diagram of part A; Figure 7 It is a partial cross-sectional structural schematic diagram of the installation cooperation of the limit block and the positioning slot according to the embodiment of the present application.

[0029] In the figure, 1, base; 11, support plate; 111, guide notch; 12, air cooling pipe; 13, air pump; 14, driving member; 141, driving motor; 142, driving screw; 2, upper air cooling plate; 21, guide cavity; 22, cooling port; 23, first protruding plate; 231, first screw hole; 24, receiving notch; 25, positioning slot; 251, second groove; 26, receiving sink; 3, lower Air cooling plate; 31, second protruding plate; 311, second screw hole; 4, connecting rod; 41, fixing groove; 42, limiting plug hole; 421, first groove; 5, protective curtain; 51, fixing pin; 6, limiting member; 61, limiting rod; 611, accommodating chamber; 612, nozzle; 613, connector; 62, limiting block; 621, placement groove; 7, elastic clamping member; 71, compression spring; 72, arc-shaped protrusion. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0031] Example: Reference Figure 1 and Figure 2 A co-extrusion film cooling mechanism comprises a base 1, wherein support plates 11 are fixedly arranged on two opposite edges of the upper surface of the base in the vertical direction, and an upper air cooling plate 2 and a lower air cooling plate 3 are arranged between the two support plates 11, and the ends of the upper air cooling plate 2 and the lower air cooling plate 3 are respectively detachably connected to the side surfaces of the two support plates 11 close to each other; and the upper air cooling plate 2 is installed directly above the lower air cooling plate 3; The upper air cooling plate 2 and the lower air cooling plate 3 are both provided with a guide cavity 21 inside, and a plurality of cooling ports 22 connected with the corresponding guide cavity 21 are evenly opened on the sides of the upper air cooling plate 2 and the lower air cooling plate 3 close to each other, and the sides of the upper air cooling plate 2 and the lower air cooling plate 3 are both fixedly provided with an air cooling pipe 12 connected with the corresponding guide cavity 21, and the base 1 is fixedly provided with an air pump 13 connected with the air cooling pipe 12 and supplying wind force; During the application of the cooling mechanism, the co-extruded film to be cooled is inserted between the upper air-cooling plate 2 and the lower air-cooling plate 3 in advance, and then the air pump 13 is started to inject the external air flow into the guide cavity 21 through the air-cooling pipe 12 and eject it from the cooling port 22, so that the upper and lower surfaces of the co-extruded film can be cooled and dissipated simultaneously by the upper and lower air-cooling plates 2 and 3.

[0032] Reference Figure 1 and Figure 2 The first protruding plates 23 are fixedly provided at both ends of the upper air-cooling plate 2, and the second protruding plates 31 are fixedly provided at both ends of the lower air-cooling plate 3. A guide notch 111 is provided on the support plate 11 in the vertical direction for the first protruding plate 23 to be inserted and slide, so as to realize the upper and lower air-cooling plates 2 and 3 to slide up and down; a driving member 14 is provided on the base 1, which can drive the upper and lower air-cooling plates 2 and 3 to slide toward and away from each other; The driving member 14 includes a driving motor 141 fixedly mounted on the base 1 along a vertical direction, and a driving screw 142 coaxially fixedly connected to the driving motor 141; a first screw hole 231 and a second screw hole 311 are respectively provided on the upper air cooling plate 2 and the lower air cooling plate 3, and two sections of threads with opposite rotation directions are provided on the outer periphery of the driving screw 142, and the first screw hole 231 and the second screw hole 311 are respectively threadedly matched with the two sections of threads with different rotation directions; When the distance between the upper cooling plate 2 and the lower cooling plate 3 needs to be adjusted, the driving motor 141 is started in advance, and the driving screw 142 is driven to rotate synchronously, thereby controlling the upper cooling plate 2 and the lower cooling plate 3 to slide up and down in a direction close to or away from each other, which will not be repeated here.

[0033] Reference Figure 3 and Figure 4 , connecting rods 4 are symmetrically arranged at both ends of the upper air-cooling plate 2, wherein the connecting rods 4 are perpendicular to the length direction of the upper air-cooling plate 2; and a flexible protective curtain 5 is arranged above the base 1, wherein fixing pins 51 are fixed on the two opposite edges of the protective curtain 5, and a fixing groove 41 for the fixing pins 51 to be inserted is provided on the connecting rod 4, thereby realizing a detachable connection between the protective curtain 5 and the connecting rod 4; When the co-extruded film has not yet been completely cooled, the top of the co-extruded film is protected by the protective curtain 5 to reduce the possibility of external dust or other impurities adhering to the upper surface of the co-extruded film; the protective curtain 5 can also be removed or replaced according to actual needs later.

[0034] Reference Figure 3 and Figure 5 , two accommodating notches 24 are relatively opened along the length direction of the upper edge of the upper air-cooling plate 2, and the connecting rods 4 on both sides are symmetrically arranged, and the ends of the two connecting rods 4 on the same side are rotatably connected to the inner walls of the two ends of the same accommodating notch 24; and the two connecting rods 4 can be rotated toward each other into the accommodating notch 24, and the upper side surface of the connecting rod 4 is flush with the side surface of the upper air-cooling plate 2 away from the base 1; A limit piece 6 is provided above the base 1; when the two connecting rods 4 are rotated to a state perpendicular to the length direction of the upper air-cooling plate 2, the limit piece 6 is used to keep the two connecting rods 4 perpendicular to the length direction of the upper air-cooling plate 2, so as to facilitate the subsequent installation and fixation of the protective curtain 5; in addition, when the protective curtain 5 is not needed, the limit piece 6 can release the limit on the connecting rod 4, and then the connecting rod 4 can be rotated to be received inside the accommodating notch 24.

[0035] Reference Figure 5 and Figure 6 The limiting member 6 is a limiting rod 61 located above the upper air cooling plate 2, wherein limiting blocks 62 are integrally formed on the outer periphery of both ends of the limiting rod 61, and a limiting plug hole 42 for the limiting block 62 to be inserted into is provided on the end of the connecting rod 4 away from the upper air cooling plate 2; and a positioning slot 25 for the limiting block 62 to be inserted into is provided on the upper side surface of the upper air cooling plate 2; When the limit member 6 locks the connecting rod 4 in a vertical state, the limit block 62 on the limit rod 61 is inserted into the limit socket 42; when the limit member 6 does not need to lock the connecting rod 4, the limit rod 61 is placed above the upper air cooling plate 2, and the limit block 62 on the limit rod 61 is inserted into the positioning slot 25.

[0036] Reference Figure 5 , Figure 6 and Figure 7 , an elastic clamping member 7 is provided on the side of the limit block 62, wherein the elastic clamping member 7 includes a compression spring 71 and an arc-shaped protrusion 72, and a placement groove 621 for the compression spring 71 and the arc-shaped protrusion 72 to be placed is opened on the limit plate, and the compression spring 71 presses one side of the arc-shaped protrusion 72 so that a part of the arc-shaped protrusion 72 protrudes from the opening of the placement groove 621, and the outer side surface of the protruding part of the arc-shaped protrusion 72 is an arc surface, and the arc length corresponding to the arc surface is a minor arc; A first groove 421 for the elastic clamping member 7 to be clamped into is formed on the inner wall of the limiting socket 42, and a second groove 251 for the elastic clamping member 7 to be clamped into is formed on the inner wall of the positioning slot 25, thereby improving the installation stability of the limiting block 62 inside the limiting socket 42 and the positioning slot 25.

[0037] Reference Figure 5 and Figure 7A accommodating groove 26 is provided on the upper air-cooling plate 2 between the two positioning slots 25. The protective curtain 5 can be removed and placed in the accommodating groove 26, which is convenient for storing the protective curtain 5. When the protective curtain 5 is placed into the accommodating groove 26, the limiting block 62 on the limiting rod 61 can also be inserted into the positioning slot 25. At this time, the limiting rod 61 also plays the role of a "cover plate" and can block the opening of the accommodating groove 26.

[0038] Reference Figure 3 and Figure 5 The limiting rod 61 is staggered with the protective curtain 5, wherein a receiving cavity 611 is provided inside the limiting rod 61, and a connector 613 communicating with the receiving cavity 611 is fixedly provided on the upper side of the limiting rod 61, and the connector 613 is used for detachably connecting with the anti-adhesive agent supply pipe, and a plurality of nozzles 612 for spraying the anti-adhesive agent are evenly provided on the side of the limiting rod 61 facing the base 1; According to actual needs, the anti-sticking agent supply pipe can be detachably connected to the connector 613, and then after the co-extruded film is cooled, the anti-sticking agent is evenly sprayed on the surface of the co-extruded film to further reduce the possibility of adhesion of the co-extruded film during subsequent winding.

[0039] In other embodiments, it is also possible to use a pipeline to connect the air pump 13 (see Figure 2 ) and the connector 613 on the limiting rod 61, and use the nozzle 612 on the limiting rod 61 to perform secondary air cooling on the co-extruded film to further improve the corresponding cooling efficiency, which will not be repeated here.

[0040] The implementation principle of the embodiment of the present application is: Before the cooling mechanism is used, the distance between the upper air cooling plate 2 and the lower air cooling plate 3 is pre-adjusted, the connecting rod 4 is rotated to a state perpendicular to the upper air cooling plate 2, and then the connecting rod 4 is limited by the limiting member 6, and the anti-adhesive agent supply pipe is detachably connected to the connector 613, and finally the protective curtain 5 is installed between the two connecting rods 4; When the cooling mechanism is in operation, the co-extruded film to be cooled is inserted between the upper air-cooling plate 2 and the lower air-cooling plate 3, and then the air pump 13 is started to inject the external air flow into the guide cavity 21 through the air-cooling pipe 12 and spray it out from the cooling port 22, so that the upper and lower surfaces of the co-extruded film are simultaneously cooled and dissipated by air using the upper and lower air-cooling plates 2 and 3; finally, after the co-extruded film is cooled, the anti-sticking agent is evenly sprayed on the surface of the co-extruded film.

[0041] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A co-extruded film cooling mechanism, characterized in that: It comprises a base (1), support plates (11) are fixedly arranged on two opposite edges of the upper surface of the base in the vertical direction, an upper air cooling plate (2) and a lower air cooling plate (3) are arranged between the two support plates (11), the upper air cooling plate (2) is located directly above the lower air cooling plate (3), and the two ends of the upper air cooling plate (2) and the lower air cooling plate (3) are respectively detachably connected to the side surfaces of the two support plates (11) that are close to each other; The upper air cooling plate (2) and the lower air cooling plate (3) are both provided with a guide cavity (21) inside, and the sides of the upper air cooling plate (2) and the lower air cooling plate (3) close to each other are both provided with a plurality of cooling ports (22) connected with the corresponding guide cavity (21), and the sides of the upper air cooling plate (2) and the lower air cooling plate (3) are both fixedly provided with an air cooling pipe (12) connected with the corresponding guide cavity (21), and the base (1) is fixedly provided with an air pump (13) connected with the air cooling pipe (12) and supplying wind force.

2. A co-extrusion film cooling mechanism according to claim 1, characterized in that: Both ends of the upper air cooling plate (2) and the lower air cooling plate (3) are slidably connected to the support plate (11), and a driving member (14) capable of driving the upper air cooling plate (2) and the lower air cooling plate (3) to slide toward and away from each other is provided on the base (1).

3. A co-extrusion film cooling mechanism according to claim 2, characterized in that: The driving member (14) comprises a driving motor (141) fixedly mounted on the base (1) in a vertical direction, and a driving screw (142) coaxially fixedly connected to the driving motor (141); The upper air cooling plate (2) and the lower air cooling plate (3) are respectively provided with a first screw hole (231) and a second screw hole (311); the outer periphery of the driving screw rod (142) is provided with two sections of threads with opposite rotation directions; the first screw hole (231) and the second screw hole (311) are respectively matched with the threads of the two sections of threads with different rotation directions.

4. A co-extrusion film cooling mechanism according to claim 1, characterized in that: Connecting rods (4) are provided at both ends of the upper air-cooling plate (2), and the connecting rods (4) are perpendicular to the length direction of the upper air-cooling plate (2). A protective curtain (5) is provided above the base (1), and the two opposite edges of the protective curtain (5) are respectively detachably connected to the side surfaces of the two connecting rods (4) that are close to each other.

5. A co-extrusion film cooling mechanism according to claim 4, characterized in that: The two opposite edges of the protective curtain (5) are both fixedly provided with fixing pins (51), and the connecting rod (4) is provided with a fixing groove (41) for the fixing pins (51) to be inserted into.

6. A co-extrusion film cooling mechanism according to claim 4, characterized in that: An accommodating notch (24) is provided on the upper side edge of the upper air cooling plate (2) along its length direction, and the ends of the two connecting rods (4) are rotatably connected to the inner walls of both ends of the accommodating notch (24); A stopper (6) is provided above the base (1) to keep the two connecting rods (4) in a vertical state with respect to the length direction of the upper air-cooling plate (2); the two connecting rods (4) can rotate towards each other into the accommodating notches (24), and the upper side surfaces of the connecting rods (4) are flush with the side surface of the upper air-cooling plate (2) away from the base (1).

7. A co-extruded film cooling mechanism according to claim 6, characterized in that: The limiting member (6) is a limiting rod (61) located above the upper air cooling plate (2), and limiting blocks (62) are fixedly provided on the outer periphery of both ends of the limiting rod (61), and a limiting plug hole (42) for the limiting block (62) to be inserted is provided on the end of the connecting rod (4) away from the upper air cooling plate (2).

8. A co-extrusion film cooling mechanism according to claim 7, characterized in that: The limit rod (61) and the protective curtain (5) are arranged in an offset manner. A receiving cavity (611) is provided inside the limit rod (61). A connector (613) connected to the receiving cavity (611) is fixedly provided on the upper side of the limit rod (61). The connector (613) is used for detachable connection with the anti-adhesive agent supply pipe. A plurality of nozzles (612) for spraying the anti-adhesive agent are provided on the side of the limit rod (61) facing the base (1).

9. A co-extrusion film cooling mechanism according to claim 7, characterized in that: An elastic clamping piece (7) is provided on the side surface of the limiting block (62), and a first groove (421) for the elastic clamping piece (7) to be clamped is provided on the inner wall of the limiting insertion hole (42); A positioning slot (25) into which a limit block (62) is snapped is provided on the upper side surface of the upper air cooling plate (2), and a second groove (251) into which an elastic snap-in component (7) is snapped is provided on the inner wall of the positioning slot (25).

10. A co-extrusion film cooling mechanism according to claim 9, characterized in that: The upper air cooling plate (2) is provided with a receiving groove (26) located between two positioning slots (25), and the protective curtain (5) can be removed and placed in the receiving groove (26).

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